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1 *eval.txt* For Vim version 7.1. Last change: 2008 May 28
4 VIM REFERENCE MANUAL by Bram Moolenaar
7 Expression evaluation *expression* *expr* *E15* *eval*
9 Using expressions is introduced in chapter 41 of the user manual |usr_41.txt|.
11 Note: Expression evaluation can be disabled at compile time. If this has been
12 done, the features in this document are not available. See |+eval| and
13 |no-eval-feature|.
15 1. Variables |variables|
16 1.1 Variable types
17 1.2 Function references |Funcref|
18 1.3 Lists |Lists|
19 1.4 Dictionaries |Dictionaries|
20 1.5 More about variables |more-variables|
21 2. Expression syntax |expression-syntax|
22 3. Internal variable |internal-variables|
23 4. Builtin Functions |functions|
24 5. Defining functions |user-functions|
25 6. Curly braces names |curly-braces-names|
26 7. Commands |expression-commands|
27 8. Exception handling |exception-handling|
28 9. Examples |eval-examples|
29 10. No +eval feature |no-eval-feature|
30 11. The sandbox |eval-sandbox|
31 12. Textlock |textlock|
33 {Vi does not have any of these commands}
35 ==============================================================================
36 1. Variables *variables*
38 1.1 Variable types ~
39 *E712*
40 There are five types of variables:
42 Number A 32 bit signed number.
43 Examples: -123 0x10 0177
45 String A NUL terminated string of 8-bit unsigned characters (bytes).
46 Examples: "ab\txx\"--" 'x-z''a,c'
48 Funcref A reference to a function |Funcref|.
49 Example: function("strlen")
51 List An ordered sequence of items |List|.
52 Example: [1, 2, ['a', 'b']]
54 Dictionary An associative, unordered array: Each entry has a key and a
55 value. |Dictionary|
56 Example: {'blue': "#0000ff", 'red': "#ff0000"}
58 The Number and String types are converted automatically, depending on how they
59 are used.
61 Conversion from a Number to a String is by making the ASCII representation of
62 the Number. Examples: >
63 Number 123 --> String "123"
64 Number 0 --> String "0"
65 Number -1 --> String "-1"
67 Conversion from a String to a Number is done by converting the first digits
68 to a number. Hexadecimal "0xf9" and Octal "017" numbers are recognized. If
69 the String doesn't start with digits, the result is zero. Examples: >
70 String "456" --> Number 456
71 String "6bar" --> Number 6
72 String "foo" --> Number 0
73 String "0xf1" --> Number 241
74 String "0100" --> Number 64
75 String "-8" --> Number -8
76 String "+8" --> Number 0
78 To force conversion from String to Number, add zero to it: >
79 :echo "0100" + 0
80 < 64 ~
82 To avoid a leading zero to cause octal conversion, or for using a different
83 base, use |str2nr()|.
85 For boolean operators Numbers are used. Zero is FALSE, non-zero is TRUE.
87 Note that in the command >
88 :if "foo"
89 "foo" is converted to 0, which means FALSE. To test for a non-empty string,
90 use strlen(): >
91 :if strlen("foo")
92 < *E745* *E728* *E703* *E729* *E730* *E731*
93 List, Dictionary and Funcref types are not automatically converted.
95 *E706*
96 You will get an error if you try to change the type of a variable. You need
97 to |:unlet| it first to avoid this error. String and Number are considered
98 equivalent though. Consider this sequence of commands: >
99 :let l = "string"
100 :let l = 44 " changes type from String to Number
101 :let l = [1, 2, 3] " error!
104 1.2 Function references ~
105 *Funcref* *E695* *E718*
106 A Funcref variable is obtained with the |function()| function. It can be used
107 in an expression in the place of a function name, before the parenthesis
108 around the arguments, to invoke the function it refers to. Example: >
110 :let Fn = function("MyFunc")
111 :echo Fn()
112 < *E704* *E705* *E707*
113 A Funcref variable must start with a capital, "s:", "w:", "t:" or "b:". You
114 cannot have both a Funcref variable and a function with the same name.
116 A special case is defining a function and directly assigning its Funcref to a
117 Dictionary entry. Example: >
118 :function dict.init() dict
119 : let self.val = 0
120 :endfunction
122 The key of the Dictionary can start with a lower case letter. The actual
123 function name is not used here. Also see |numbered-function|.
125 A Funcref can also be used with the |:call| command: >
126 :call Fn()
127 :call dict.init()
129 The name of the referenced function can be obtained with |string()|. >
130 :let func = string(Fn)
132 You can use |call()| to invoke a Funcref and use a list variable for the
133 arguments: >
134 :let r = call(Fn, mylist)
137 1.3 Lists ~
138 *List* *Lists* *E686*
139 A List is an ordered sequence of items. An item can be of any type. Items
140 can be accessed by their index number. Items can be added and removed at any
141 position in the sequence.
144 List creation ~
145 *E696* *E697*
146 A List is created with a comma separated list of items in square brackets.
147 Examples: >
148 :let mylist = [1, two, 3, "four"]
149 :let emptylist = []
151 An item can be any expression. Using a List for an item creates a
152 List of Lists: >
153 :let nestlist = [[11, 12], [21, 22], [31, 32]]
155 An extra comma after the last item is ignored.
158 List index ~
159 *list-index* *E684*
160 An item in the List can be accessed by putting the index in square brackets
161 after the List. Indexes are zero-based, thus the first item has index zero. >
162 :let item = mylist[0] " get the first item: 1
163 :let item = mylist[2] " get the third item: 3
165 When the resulting item is a list this can be repeated: >
166 :let item = nestlist[0][1] " get the first list, second item: 12
167 <
168 A negative index is counted from the end. Index -1 refers to the last item in
169 the List, -2 to the last but one item, etc. >
170 :let last = mylist[-1] " get the last item: "four"
172 To avoid an error for an invalid index use the |get()| function. When an item
173 is not available it returns zero or the default value you specify: >
174 :echo get(mylist, idx)
175 :echo get(mylist, idx, "NONE")
178 List concatenation ~
180 Two lists can be concatenated with the "+" operator: >
181 :let longlist = mylist + [5, 6]
182 :let mylist += [7, 8]
184 To prepend or append an item turn the item into a list by putting [] around
185 it. To change a list in-place see |list-modification| below.
188 Sublist ~
190 A part of the List can be obtained by specifying the first and last index,
191 separated by a colon in square brackets: >
192 :let shortlist = mylist[2:-1] " get List [3, "four"]
194 Omitting the first index is similar to zero. Omitting the last index is
195 similar to -1. >
196 :let endlist = mylist[2:] " from item 2 to the end: [3, "four"]
197 :let shortlist = mylist[2:2] " List with one item: [3]
198 :let otherlist = mylist[:] " make a copy of the List
200 If the first index is beyond the last item of the List or the second item is
201 before the first item, the result is an empty list. There is no error
202 message.
204 If the second index is equal to or greater than the length of the list the
205 length minus one is used: >
206 :let mylist = [0, 1, 2, 3]
207 :echo mylist[2:8] " result: [2, 3]
209 NOTE: mylist[s:e] means using the variable "s:e" as index. Watch out for
210 using a single letter variable before the ":". Insert a space when needed:
211 mylist[s : e].
214 List identity ~
215 *list-identity*
216 When variable "aa" is a list and you assign it to another variable "bb", both
217 variables refer to the same list. Thus changing the list "aa" will also
218 change "bb": >
219 :let aa = [1, 2, 3]
220 :let bb = aa
221 :call add(aa, 4)
222 :echo bb
223 < [1, 2, 3, 4]
225 Making a copy of a list is done with the |copy()| function. Using [:] also
226 works, as explained above. This creates a shallow copy of the list: Changing
227 a list item in the list will also change the item in the copied list: >
228 :let aa = [[1, 'a'], 2, 3]
229 :let bb = copy(aa)
230 :call add(aa, 4)
231 :let aa[0][1] = 'aaa'
232 :echo aa
233 < [[1, aaa], 2, 3, 4] >
234 :echo bb
235 < [[1, aaa], 2, 3]
237 To make a completely independent list use |deepcopy()|. This also makes a
238 copy of the values in the list, recursively. Up to a hundred levels deep.
240 The operator "is" can be used to check if two variables refer to the same
241 List. "isnot" does the opposite. In contrast "==" compares if two lists have
242 the same value. >
243 :let alist = [1, 2, 3]
244 :let blist = [1, 2, 3]
245 :echo alist is blist
246 < 0 >
247 :echo alist == blist
248 < 1
250 Note about comparing lists: Two lists are considered equal if they have the
251 same length and all items compare equal, as with using "==". There is one
252 exception: When comparing a number with a string they are considered
253 different. There is no automatic type conversion, as with using "==" on
254 variables. Example: >
255 echo 4 == "4"
256 < 1 >
257 echo [4] == ["4"]
258 < 0
260 Thus comparing Lists is more strict than comparing numbers and strings. You
261 can compare simple values this way too by putting them in a string: >
263 :let a = 5
264 :let b = "5"
265 echo a == b
266 < 1 >
267 echo [a] == [b]
268 < 0
271 List unpack ~
273 To unpack the items in a list to individual variables, put the variables in
274 square brackets, like list items: >
275 :let [var1, var2] = mylist
277 When the number of variables does not match the number of items in the list
278 this produces an error. To handle any extra items from the list append ";"
279 and a variable name: >
280 :let [var1, var2; rest] = mylist
282 This works like: >
283 :let var1 = mylist[0]
284 :let var2 = mylist[1]
285 :let rest = mylist[2:]
287 Except that there is no error if there are only two items. "rest" will be an
288 empty list then.
291 List modification ~
292 *list-modification*
293 To change a specific item of a list use |:let| this way: >
294 :let list[4] = "four"
295 :let listlist[0][3] = item
297 To change part of a list you can specify the first and last item to be
298 modified. The value must at least have the number of items in the range: >
299 :let list[3:5] = [3, 4, 5]
301 Adding and removing items from a list is done with functions. Here are a few
302 examples: >
303 :call insert(list, 'a') " prepend item 'a'
304 :call insert(list, 'a', 3) " insert item 'a' before list[3]
305 :call add(list, "new") " append String item
306 :call add(list, [1, 2]) " append a List as one new item
307 :call extend(list, [1, 2]) " extend the list with two more items
308 :let i = remove(list, 3) " remove item 3
309 :unlet list[3] " idem
310 :let l = remove(list, 3, -1) " remove items 3 to last item
311 :unlet list[3 : ] " idem
312 :call filter(list, 'v:val !~ "x"') " remove items with an 'x'
314 Changing the order of items in a list: >
315 :call sort(list) " sort a list alphabetically
316 :call reverse(list) " reverse the order of items
319 For loop ~
321 The |:for| loop executes commands for each item in a list. A variable is set
322 to each item in the list in sequence. Example: >
323 :for item in mylist
324 : call Doit(item)
325 :endfor
327 This works like: >
328 :let index = 0
329 :while index < len(mylist)
330 : let item = mylist[index]
331 : :call Doit(item)
332 : let index = index + 1
333 :endwhile
335 Note that all items in the list should be of the same type, otherwise this
336 results in error |E706|. To avoid this |:unlet| the variable at the end of
337 the loop.
339 If all you want to do is modify each item in the list then the |map()|
340 function will be a simpler method than a for loop.
342 Just like the |:let| command, |:for| also accepts a list of variables. This
343 requires the argument to be a list of lists. >
344 :for [lnum, col] in [[1, 3], [2, 8], [3, 0]]
345 : call Doit(lnum, col)
346 :endfor
348 This works like a |:let| command is done for each list item. Again, the types
349 must remain the same to avoid an error.
351 It is also possible to put remaining items in a List variable: >
352 :for [i, j; rest] in listlist
353 : call Doit(i, j)
354 : if !empty(rest)
355 : echo "remainder: " . string(rest)
356 : endif
357 :endfor
360 List functions ~
361 *E714*
362 Functions that are useful with a List: >
363 :let r = call(funcname, list) " call a function with an argument list
364 :if empty(list) " check if list is empty
365 :let l = len(list) " number of items in list
366 :let big = max(list) " maximum value in list
367 :let small = min(list) " minimum value in list
368 :let xs = count(list, 'x') " count nr of times 'x' appears in list
369 :let i = index(list, 'x') " index of first 'x' in list
370 :let lines = getline(1, 10) " get ten text lines from buffer
371 :call append('$', lines) " append text lines in buffer
372 :let list = split("a b c") " create list from items in a string
373 :let string = join(list, ', ') " create string from list items
374 :let s = string(list) " String representation of list
375 :call map(list, '">> " . v:val') " prepend ">> " to each item
377 Don't forget that a combination of features can make things simple. For
378 example, to add up all the numbers in a list: >
379 :exe 'let sum = ' . join(nrlist, '+')
382 1.4 Dictionaries ~
383 *Dictionaries* *Dictionary*
384 A Dictionary is an associative array: Each entry has a key and a value. The
385 entry can be located with the key. The entries are stored without a specific
386 ordering.
389 Dictionary creation ~
390 *E720* *E721* *E722* *E723*
391 A Dictionary is created with a comma separated list of entries in curly
392 braces. Each entry has a key and a value, separated by a colon. Each key can
393 only appear once. Examples: >
394 :let mydict = {1: 'one', 2: 'two', 3: 'three'}
395 :let emptydict = {}
396 < *E713* *E716* *E717*
397 A key is always a String. You can use a Number, it will be converted to a
398 String automatically. Thus the String '4' and the number 4 will find the same
399 entry. Note that the String '04' and the Number 04 are different, since the
400 Number will be converted to the String '4'.
402 A value can be any expression. Using a Dictionary for a value creates a
403 nested Dictionary: >
404 :let nestdict = {1: {11: 'a', 12: 'b'}, 2: {21: 'c'}}
406 An extra comma after the last entry is ignored.
409 Accessing entries ~
411 The normal way to access an entry is by putting the key in square brackets: >
412 :let val = mydict["one"]
413 :let mydict["four"] = 4
415 You can add new entries to an existing Dictionary this way, unlike Lists.
417 For keys that consist entirely of letters, digits and underscore the following
418 form can be used |expr-entry|: >
419 :let val = mydict.one
420 :let mydict.four = 4
422 Since an entry can be any type, also a List and a Dictionary, the indexing and
423 key lookup can be repeated: >
424 :echo dict.key[idx].key
427 Dictionary to List conversion ~
429 You may want to loop over the entries in a dictionary. For this you need to
430 turn the Dictionary into a List and pass it to |:for|.
432 Most often you want to loop over the keys, using the |keys()| function: >
433 :for key in keys(mydict)
434 : echo key . ': ' . mydict[key]
435 :endfor
437 The List of keys is unsorted. You may want to sort them first: >
438 :for key in sort(keys(mydict))
440 To loop over the values use the |values()| function: >
441 :for v in values(mydict)
442 : echo "value: " . v
443 :endfor
445 If you want both the key and the value use the |items()| function. It returns
446 a List in which each item is a List with two items, the key and the value: >
447 :for [key, value] in items(mydict)
448 : echo key . ': ' . value
449 :endfor
452 Dictionary identity ~
453 *dict-identity*
454 Just like Lists you need to use |copy()| and |deepcopy()| to make a copy of a
455 Dictionary. Otherwise, assignment results in referring to the same
456 Dictionary: >
457 :let onedict = {'a': 1, 'b': 2}
458 :let adict = onedict
459 :let adict['a'] = 11
460 :echo onedict['a']
461 11
463 Two Dictionaries compare equal if all the key-value pairs compare equal. For
464 more info see |list-identity|.
467 Dictionary modification ~
468 *dict-modification*
469 To change an already existing entry of a Dictionary, or to add a new entry,
470 use |:let| this way: >
471 :let dict[4] = "four"
472 :let dict['one'] = item
474 Removing an entry from a Dictionary is done with |remove()| or |:unlet|.
475 Three ways to remove the entry with key "aaa" from dict: >
476 :let i = remove(dict, 'aaa')
477 :unlet dict.aaa
478 :unlet dict['aaa']
480 Merging a Dictionary with another is done with |extend()|: >
481 :call extend(adict, bdict)
482 This extends adict with all entries from bdict. Duplicate keys cause entries
483 in adict to be overwritten. An optional third argument can change this.
484 Note that the order of entries in a Dictionary is irrelevant, thus don't
485 expect ":echo adict" to show the items from bdict after the older entries in
486 adict.
488 Weeding out entries from a Dictionary can be done with |filter()|: >
489 :call filter(dict, 'v:val =~ "x"')
490 This removes all entries from "dict" with a value not matching 'x'.
493 Dictionary function ~
494 *Dictionary-function* *self* *E725*
495 When a function is defined with the "dict" attribute it can be used in a
496 special way with a dictionary. Example: >
497 :function Mylen() dict
498 : return len(self.data)
499 :endfunction
500 :let mydict = {'data': [0, 1, 2, 3], 'len': function("Mylen")}
501 :echo mydict.len()
503 This is like a method in object oriented programming. The entry in the
504 Dictionary is a |Funcref|. The local variable "self" refers to the dictionary
505 the function was invoked from.
507 It is also possible to add a function without the "dict" attribute as a
508 Funcref to a Dictionary, but the "self" variable is not available then.
510 *numbered-function* *anonymous-function*
511 To avoid the extra name for the function it can be defined and directly
512 assigned to a Dictionary in this way: >
513 :let mydict = {'data': [0, 1, 2, 3]}
514 :function mydict.len() dict
515 : return len(self.data)
516 :endfunction
517 :echo mydict.len()
519 The function will then get a number and the value of dict.len is a |Funcref|
520 that references this function. The function can only be used through a
521 |Funcref|. It will automatically be deleted when there is no |Funcref|
522 remaining that refers to it.
524 It is not necessary to use the "dict" attribute for a numbered function.
527 Functions for Dictionaries ~
528 *E715*
529 Functions that can be used with a Dictionary: >
530 :if has_key(dict, 'foo') " TRUE if dict has entry with key "foo"
531 :if empty(dict) " TRUE if dict is empty
532 :let l = len(dict) " number of items in dict
533 :let big = max(dict) " maximum value in dict
534 :let small = min(dict) " minimum value in dict
535 :let xs = count(dict, 'x') " count nr of times 'x' appears in dict
536 :let s = string(dict) " String representation of dict
537 :call map(dict, '">> " . v:val') " prepend ">> " to each item
540 1.5 More about variables ~
541 *more-variables*
542 If you need to know the type of a variable or expression, use the |type()|
543 function.
545 When the '!' flag is included in the 'viminfo' option, global variables that
546 start with an uppercase letter, and don't contain a lowercase letter, are
547 stored in the viminfo file |viminfo-file|.
549 When the 'sessionoptions' option contains "global", global variables that
550 start with an uppercase letter and contain at least one lowercase letter are
551 stored in the session file |session-file|.
553 variable name can be stored where ~
554 my_var_6 not
555 My_Var_6 session file
556 MY_VAR_6 viminfo file
559 It's possible to form a variable name with curly braces, see
560 |curly-braces-names|.
562 ==============================================================================
563 2. Expression syntax *expression-syntax*
565 Expression syntax summary, from least to most significant:
567 |expr1| expr2 ? expr1 : expr1 if-then-else
569 |expr2| expr3 || expr3 .. logical OR
571 |expr3| expr4 && expr4 .. logical AND
573 |expr4| expr5 == expr5 equal
574 expr5 != expr5 not equal
575 expr5 > expr5 greater than
576 expr5 >= expr5 greater than or equal
577 expr5 < expr5 smaller than
578 expr5 <= expr5 smaller than or equal
579 expr5 =~ expr5 regexp matches
580 expr5 !~ expr5 regexp doesn't match
582 expr5 ==? expr5 equal, ignoring case
583 expr5 ==# expr5 equal, match case
584 etc. As above, append ? for ignoring case, # for
585 matching case
587 expr5 is expr5 same |List| instance
588 expr5 isnot expr5 different |List| instance
590 |expr5| expr6 + expr6 .. number addition or list concatenation
591 expr6 - expr6 .. number subtraction
592 expr6 . expr6 .. string concatenation
594 |expr6| expr7 * expr7 .. number multiplication
595 expr7 / expr7 .. number division
596 expr7 % expr7 .. number modulo
598 |expr7| ! expr7 logical NOT
599 - expr7 unary minus
600 + expr7 unary plus
603 |expr8| expr8[expr1] byte of a String or item of a |List|
604 expr8[expr1 : expr1] substring of a String or sublist of a |List|
605 expr8.name entry in a |Dictionary|
606 expr8(expr1, ...) function call with |Funcref| variable
608 |expr9| number number constant
609 "string" string constant, backslash is special
610 'string' string constant, ' is doubled
611 [expr1, ...] |List|
612 {expr1: expr1, ...} |Dictionary|
613 &option option value
614 (expr1) nested expression
615 variable internal variable
616 va{ria}ble internal variable with curly braces
617 $VAR environment variable
618 @r contents of register 'r'
619 function(expr1, ...) function call
620 func{ti}on(expr1, ...) function call with curly braces
623 ".." indicates that the operations in this level can be concatenated.
624 Example: >
625 &nu || &list && &shell == "csh"
627 All expressions within one level are parsed from left to right.
630 expr1 *expr1* *E109*
631 -----
633 expr2 ? expr1 : expr1
635 The expression before the '?' is evaluated to a number. If it evaluates to
636 non-zero, the result is the value of the expression between the '?' and ':',
637 otherwise the result is the value of the expression after the ':'.
638 Example: >
639 :echo lnum == 1 ? "top" : lnum
641 Since the first expression is an "expr2", it cannot contain another ?:. The
642 other two expressions can, thus allow for recursive use of ?:.
643 Example: >
644 :echo lnum == 1 ? "top" : lnum == 1000 ? "last" : lnum
646 To keep this readable, using |line-continuation| is suggested: >
647 :echo lnum == 1
648 :\ ? "top"
649 :\ : lnum == 1000
650 :\ ? "last"
651 :\ : lnum
653 You should always put a space before the ':', otherwise it can be mistaken for
654 use in a variable such as "a:1".
657 expr2 and expr3 *expr2* *expr3*
658 ---------------
660 *expr-barbar* *expr-&&*
661 The "||" and "&&" operators take one argument on each side. The arguments
662 are (converted to) Numbers. The result is:
664 input output ~
665 n1 n2 n1 || n2 n1 && n2 ~
666 zero zero zero zero
667 zero non-zero non-zero zero
668 non-zero zero non-zero zero
669 non-zero non-zero non-zero non-zero
671 The operators can be concatenated, for example: >
673 &nu || &list && &shell == "csh"
675 Note that "&&" takes precedence over "||", so this has the meaning of: >
677 &nu || (&list && &shell == "csh")
679 Once the result is known, the expression "short-circuits", that is, further
680 arguments are not evaluated. This is like what happens in C. For example: >
682 let a = 1
683 echo a || b
685 This is valid even if there is no variable called "b" because "a" is non-zero,
686 so the result must be non-zero. Similarly below: >
688 echo exists("b") && b == "yes"
690 This is valid whether "b" has been defined or not. The second clause will
691 only be evaluated if "b" has been defined.
694 expr4 *expr4*
695 -----
697 expr5 {cmp} expr5
699 Compare two expr5 expressions, resulting in a 0 if it evaluates to false, or 1
700 if it evaluates to true.
702 *expr-==* *expr-!=* *expr->* *expr->=*
703 *expr-<* *expr-<=* *expr-=~* *expr-!~*
704 *expr-==#* *expr-!=#* *expr->#* *expr->=#*
705 *expr-<#* *expr-<=#* *expr-=~#* *expr-!~#*
706 *expr-==?* *expr-!=?* *expr->?* *expr->=?*
707 *expr-<?* *expr-<=?* *expr-=~?* *expr-!~?*
708 *expr-is*
709 use 'ignorecase' match case ignore case ~
710 equal == ==# ==?
711 not equal != !=# !=?
712 greater than > ># >?
713 greater than or equal >= >=# >=?
714 smaller than < <# <?
715 smaller than or equal <= <=# <=?
716 regexp matches =~ =~# =~?
717 regexp doesn't match !~ !~# !~?
718 same instance is
719 different instance isnot
721 Examples:
722 "abc" ==# "Abc" evaluates to 0
723 "abc" ==? "Abc" evaluates to 1
724 "abc" == "Abc" evaluates to 1 if 'ignorecase' is set, 0 otherwise
726 *E691* *E692*
727 A |List| can only be compared with a |List| and only "equal", "not equal" and
728 "is" can be used. This compares the values of the list, recursively.
729 Ignoring case means case is ignored when comparing item values.
731 *E735* *E736*
732 A |Dictionary| can only be compared with a |Dictionary| and only "equal", "not
733 equal" and "is" can be used. This compares the key/values of the |Dictionary|
734 recursively. Ignoring case means case is ignored when comparing item values.
736 *E693* *E694*
737 A |Funcref| can only be compared with a |Funcref| and only "equal" and "not
738 equal" can be used. Case is never ignored.
740 When using "is" or "isnot" with a |List| this checks if the expressions are
741 referring to the same |List| instance. A copy of a |List| is different from
742 the original |List|. When using "is" without a |List| it is equivalent to
743 using "equal", using "isnot" equivalent to using "not equal". Except that a
744 different type means the values are different. "4 == '4'" is true, "4 is '4'"
745 is false.
747 When comparing a String with a Number, the String is converted to a Number,
748 and the comparison is done on Numbers. This means that "0 == 'x'" is TRUE,
749 because 'x' converted to a Number is zero.
751 When comparing two Strings, this is done with strcmp() or stricmp(). This
752 results in the mathematical difference (comparing byte values), not
753 necessarily the alphabetical difference in the local language.
755 When using the operators with a trailing '#", or the short version and
756 'ignorecase' is off, the comparing is done with strcmp(): case matters.
758 When using the operators with a trailing '?', or the short version and
759 'ignorecase' is set, the comparing is done with stricmp(): case is ignored.
761 'smartcase' is not used.
763 The "=~" and "!~" operators match the lefthand argument with the righthand
764 argument, which is used as a pattern. See |pattern| for what a pattern is.
765 This matching is always done like 'magic' was set and 'cpoptions' is empty, no
766 matter what the actual value of 'magic' or 'cpoptions' is. This makes scripts
767 portable. To avoid backslashes in the regexp pattern to be doubled, use a
768 single-quote string, see |literal-string|.
769 Since a string is considered to be a single line, a multi-line pattern
770 (containing \n, backslash-n) will not match. However, a literal NL character
771 can be matched like an ordinary character. Examples:
772 "foo\nbar" =~ "\n" evaluates to 1
773 "foo\nbar" =~ "\\n" evaluates to 0
776 expr5 and expr6 *expr5* *expr6*
777 ---------------
778 expr6 + expr6 .. Number addition or |List| concatenation *expr-+*
779 expr6 - expr6 .. Number subtraction *expr--*
780 expr6 . expr6 .. String concatenation *expr-.*
782 For |Lists| only "+" is possible and then both expr6 must be a list. The
783 result is a new list with the two lists Concatenated.
785 expr7 * expr7 .. number multiplication *expr-star*
786 expr7 / expr7 .. number division *expr-/*
787 expr7 % expr7 .. number modulo *expr-%*
789 For all, except ".", Strings are converted to Numbers.
791 Note the difference between "+" and ".":
792 "123" + "456" = 579
793 "123" . "456" = "123456"
795 When the righthand side of '/' is zero, the result is 0x7fffffff.
796 When the righthand side of '%' is zero, the result is 0.
798 None of these work for |Funcref|s.
801 expr7 *expr7*
802 -----
803 ! expr7 logical NOT *expr-!*
804 - expr7 unary minus *expr-unary--*
805 + expr7 unary plus *expr-unary-+*
807 For '!' non-zero becomes zero, zero becomes one.
808 For '-' the sign of the number is changed.
809 For '+' the number is unchanged.
811 A String will be converted to a Number first.
813 These three can be repeated and mixed. Examples:
814 !-1 == 0
815 !!8 == 1
816 --9 == 9
819 expr8 *expr8*
820 -----
821 expr8[expr1] item of String or |List| *expr-[]* *E111*
823 If expr8 is a Number or String this results in a String that contains the
824 expr1'th single byte from expr8. expr8 is used as a String, expr1 as a
825 Number. Note that this doesn't recognize multi-byte encodings.
827 Index zero gives the first character. This is like it works in C. Careful:
828 text column numbers start with one! Example, to get the character under the
829 cursor: >
830 :let c = getline(".")[col(".") - 1]
832 If the length of the String is less than the index, the result is an empty
833 String. A negative index always results in an empty string (reason: backwards
834 compatibility). Use [-1:] to get the last byte.
836 If expr8 is a |List| then it results the item at index expr1. See |list-index|
837 for possible index values. If the index is out of range this results in an
838 error. Example: >
839 :let item = mylist[-1] " get last item
841 Generally, if a |List| index is equal to or higher than the length of the
842 |List|, or more negative than the length of the |List|, this results in an
843 error.
846 expr8[expr1a : expr1b] substring or sublist *expr-[:]*
848 If expr8 is a Number or String this results in the substring with the bytes
849 from expr1a to and including expr1b. expr8 is used as a String, expr1a and
850 expr1b are used as a Number. Note that this doesn't recognize multi-byte
851 encodings.
853 If expr1a is omitted zero is used. If expr1b is omitted the length of the
854 string minus one is used.
856 A negative number can be used to measure from the end of the string. -1 is
857 the last character, -2 the last but one, etc.
859 If an index goes out of range for the string characters are omitted. If
860 expr1b is smaller than expr1a the result is an empty string.
862 Examples: >
863 :let c = name[-1:] " last byte of a string
864 :let c = name[-2:-2] " last but one byte of a string
865 :let s = line(".")[4:] " from the fifth byte to the end
866 :let s = s[:-3] " remove last two bytes
868 If expr8 is a |List| this results in a new |List| with the items indicated by
869 the indexes expr1a and expr1b. This works like with a String, as explained
870 just above, except that indexes out of range cause an error. Examples: >
871 :let l = mylist[:3] " first four items
872 :let l = mylist[4:4] " List with one item
873 :let l = mylist[:] " shallow copy of a List
875 Using expr8[expr1] or expr8[expr1a : expr1b] on a |Funcref| results in an
876 error.
879 expr8.name entry in a |Dictionary| *expr-entry*
881 If expr8 is a |Dictionary| and it is followed by a dot, then the following
882 name will be used as a key in the |Dictionary|. This is just like:
883 expr8[name].
885 The name must consist of alphanumeric characters, just like a variable name,
886 but it may start with a number. Curly braces cannot be used.
888 There must not be white space before or after the dot.
890 Examples: >
891 :let dict = {"one": 1, 2: "two"}
892 :echo dict.one
893 :echo dict .2
895 Note that the dot is also used for String concatenation. To avoid confusion
896 always put spaces around the dot for String concatenation.
899 expr8(expr1, ...) |Funcref| function call
901 When expr8 is a |Funcref| type variable, invoke the function it refers to.
905 *expr9*
906 number
907 ------
908 number number constant *expr-number*
910 Decimal, Hexadecimal (starting with 0x or 0X), or Octal (starting with 0).
913 string *expr-string* *E114*
914 ------
915 "string" string constant *expr-quote*
917 Note that double quotes are used.
919 A string constant accepts these special characters:
920 \... three-digit octal number (e.g., "\316")
921 \.. two-digit octal number (must be followed by non-digit)
922 \. one-digit octal number (must be followed by non-digit)
923 \x.. byte specified with two hex numbers (e.g., "\x1f")
924 \x. byte specified with one hex number (must be followed by non-hex char)
925 \X.. same as \x..
926 \X. same as \x.
927 \u.... character specified with up to 4 hex numbers, stored according to the
928 current value of 'encoding' (e.g., "\u02a4")
929 \U.... same as \u....
930 \b backspace <BS>
931 \e escape <Esc>
932 \f formfeed <FF>
933 \n newline <NL>
934 \r return <CR>
935 \t tab <Tab>
936 \\ backslash
937 \" double quote
938 \<xxx> Special key named "xxx". e.g. "\<C-W>" for CTRL-W.
940 Note that "\xff" is stored as the byte 255, which may be invalid in some
941 encodings. Use "\u00ff" to store character 255 according to the current value
942 of 'encoding'.
944 Note that "\000" and "\x00" force the end of the string.
947 literal-string *literal-string* *E115*
948 ---------------
949 'string' string constant *expr-'*
951 Note that single quotes are used.
953 This string is taken as it is. No backslashes are removed or have a special
954 meaning. The only exception is that two quotes stand for one quote.
956 Single quoted strings are useful for patterns, so that backslashes do not need
957 to be doubled. These two commands are equivalent: >
958 if a =~ "\\s*"
959 if a =~ '\s*'
962 option *expr-option* *E112* *E113*
963 ------
964 &option option value, local value if possible
965 &g:option global option value
966 &l:option local option value
968 Examples: >
969 echo "tabstop is " . &tabstop
970 if &insertmode
972 Any option name can be used here. See |options|. When using the local value
973 and there is no buffer-local or window-local value, the global value is used
974 anyway.
977 register *expr-register* *@r*
978 --------
979 @r contents of register 'r'
981 The result is the contents of the named register, as a single string.
982 Newlines are inserted where required. To get the contents of the unnamed
983 register use @" or @@. See |registers| for an explanation of the available
984 registers.
986 When using the '=' register you get the expression itself, not what it
987 evaluates to. Use |eval()| to evaluate it.
990 nesting *expr-nesting* *E110*
991 -------
992 (expr1) nested expression
995 environment variable *expr-env*
996 --------------------
997 $VAR environment variable
999 The String value of any environment variable. When it is not defined, the
1000 result is an empty string.
1001 *expr-env-expand*
1002 Note that there is a difference between using $VAR directly and using
1003 expand("$VAR"). Using it directly will only expand environment variables that
1004 are known inside the current Vim session. Using expand() will first try using
1005 the environment variables known inside the current Vim session. If that
1006 fails, a shell will be used to expand the variable. This can be slow, but it
1007 does expand all variables that the shell knows about. Example: >
1008 :echo $version
1009 :echo expand("$version")
1010 The first one probably doesn't echo anything, the second echoes the $version
1011 variable (if your shell supports it).
1014 internal variable *expr-variable*
1015 -----------------
1016 variable internal variable
1017 See below |internal-variables|.
1020 function call *expr-function* *E116* *E118* *E119* *E120*
1021 -------------
1022 function(expr1, ...) function call
1023 See below |functions|.
1026 ==============================================================================
1027 3. Internal variable *internal-variables* *E121*
1028 *E461*
1029 An internal variable name can be made up of letters, digits and '_'. But it
1030 cannot start with a digit. It's also possible to use curly braces, see
1031 |curly-braces-names|.
1033 An internal variable is created with the ":let" command |:let|.
1034 An internal variable is explicitly destroyed with the ":unlet" command
1035 |:unlet|.
1036 Using a name that is not an internal variable or refers to a variable that has
1037 been destroyed results in an error.
1039 There are several name spaces for variables. Which one is to be used is
1040 specified by what is prepended:
1042 (nothing) In a function: local to a function; otherwise: global
1043 |buffer-variable| b: Local to the current buffer.
1044 |window-variable| w: Local to the current window.
1045 |tabpage-variable| t: Local to the current tab page.
1046 |global-variable| g: Global.
1047 |local-variable| l: Local to a function.
1048 |script-variable| s: Local to a |:source|'ed Vim script.
1049 |function-argument| a: Function argument (only inside a function).
1050 |vim-variable| v: Global, predefined by Vim.
1052 The scope name by itself can be used as a |Dictionary|. For example, to
1053 delete all script-local variables: >
1054 :for k in keys(s:)
1055 : unlet s:[k]
1056 :endfor
1057 <
1058 *buffer-variable* *b:var*
1059 A variable name that is preceded with "b:" is local to the current buffer.
1060 Thus you can have several "b:foo" variables, one for each buffer.
1061 This kind of variable is deleted when the buffer is wiped out or deleted with
1062 |:bdelete|.
1064 One local buffer variable is predefined:
1065 *b:changedtick-variable* *changetick*
1066 b:changedtick The total number of changes to the current buffer. It is
1067 incremented for each change. An undo command is also a change
1068 in this case. This can be used to perform an action only when
1069 the buffer has changed. Example: >
1070 :if my_changedtick != b:changedtick
1071 : let my_changedtick = b:changedtick
1072 : call My_Update()
1073 :endif
1074 <
1075 *window-variable* *w:var*
1076 A variable name that is preceded with "w:" is local to the current window. It
1077 is deleted when the window is closed.
1079 *tabpage-variable* *t:var*
1080 A variable name that is preceded with "t:" is local to the current tab page,
1081 It is deleted when the tab page is closed. {not available when compiled
1082 without the +windows feature}
1084 *global-variable* *g:var*
1085 Inside functions global variables are accessed with "g:". Omitting this will
1086 access a variable local to a function. But "g:" can also be used in any other
1087 place if you like.
1089 *local-variable* *l:var*
1090 Inside functions local variables are accessed without prepending anything.
1091 But you can also prepend "l:" if you like. However, without prepending "l:"
1092 you may run into reserved variable names. For example "count". By itself it
1093 refers to "v:count". Using "l:count" you can have a local variable with the
1094 same name.
1096 *script-variable* *s:var*
1097 In a Vim script variables starting with "s:" can be used. They cannot be
1098 accessed from outside of the scripts, thus are local to the script.
1100 They can be used in:
1101 - commands executed while the script is sourced
1102 - functions defined in the script
1103 - autocommands defined in the script
1104 - functions and autocommands defined in functions and autocommands which were
1105 defined in the script (recursively)
1106 - user defined commands defined in the script
1107 Thus not in:
1108 - other scripts sourced from this one
1109 - mappings
1110 - etc.
1112 Script variables can be used to avoid conflicts with global variable names.
1113 Take this example: >
1115 let s:counter = 0
1116 function MyCounter()
1117 let s:counter = s:counter + 1
1118 echo s:counter
1119 endfunction
1120 command Tick call MyCounter()
1122 You can now invoke "Tick" from any script, and the "s:counter" variable in
1123 that script will not be changed, only the "s:counter" in the script where
1124 "Tick" was defined is used.
1126 Another example that does the same: >
1128 let s:counter = 0
1129 command Tick let s:counter = s:counter + 1 | echo s:counter
1131 When calling a function and invoking a user-defined command, the context for
1132 script variables is set to the script where the function or command was
1133 defined.
1135 The script variables are also available when a function is defined inside a
1136 function that is defined in a script. Example: >
1138 let s:counter = 0
1139 function StartCounting(incr)
1140 if a:incr
1141 function MyCounter()
1142 let s:counter = s:counter + 1
1143 endfunction
1144 else
1145 function MyCounter()
1146 let s:counter = s:counter - 1
1147 endfunction
1148 endif
1149 endfunction
1151 This defines the MyCounter() function either for counting up or counting down
1152 when calling StartCounting(). It doesn't matter from where StartCounting() is
1153 called, the s:counter variable will be accessible in MyCounter().
1155 When the same script is sourced again it will use the same script variables.
1156 They will remain valid as long as Vim is running. This can be used to
1157 maintain a counter: >
1159 if !exists("s:counter")
1160 let s:counter = 1
1161 echo "script executed for the first time"
1162 else
1163 let s:counter = s:counter + 1
1164 echo "script executed " . s:counter . " times now"
1165 endif
1167 Note that this means that filetype plugins don't get a different set of script
1168 variables for each buffer. Use local buffer variables instead |b:var|.
1171 Predefined Vim variables: *vim-variable* *v:var*
1173 *v:beval_col* *beval_col-variable*
1174 v:beval_col The number of the column, over which the mouse pointer is.
1175 This is the byte index in the |v:beval_lnum| line.
1176 Only valid while evaluating the 'balloonexpr' option.
1178 *v:beval_bufnr* *beval_bufnr-variable*
1179 v:beval_bufnr The number of the buffer, over which the mouse pointer is. Only
1180 valid while evaluating the 'balloonexpr' option.
1182 *v:beval_lnum* *beval_lnum-variable*
1183 v:beval_lnum The number of the line, over which the mouse pointer is. Only
1184 valid while evaluating the 'balloonexpr' option.
1186 *v:beval_text* *beval_text-variable*
1187 v:beval_text The text under or after the mouse pointer. Usually a word as
1188 it is useful for debugging a C program. 'iskeyword' applies,
1189 but a dot and "->" before the position is included. When on a
1190 ']' the text before it is used, including the matching '[' and
1191 word before it. When on a Visual area within one line the
1192 highlighted text is used.
1193 Only valid while evaluating the 'balloonexpr' option.
1195 *v:beval_winnr* *beval_winnr-variable*
1196 v:beval_winnr The number of the window, over which the mouse pointer is. Only
1197 valid while evaluating the 'balloonexpr' option.
1199 *v:char* *char-variable*
1200 v:char Argument for evaluating 'formatexpr'.
1202 *v:charconvert_from* *charconvert_from-variable*
1203 v:charconvert_from
1204 The name of the character encoding of a file to be converted.
1205 Only valid while evaluating the 'charconvert' option.
1207 *v:charconvert_to* *charconvert_to-variable*
1208 v:charconvert_to
1209 The name of the character encoding of a file after conversion.
1210 Only valid while evaluating the 'charconvert' option.
1212 *v:cmdarg* *cmdarg-variable*
1213 v:cmdarg This variable is used for two purposes:
1214 1. The extra arguments given to a file read/write command.
1215 Currently these are "++enc=" and "++ff=". This variable is
1216 set before an autocommand event for a file read/write
1217 command is triggered. There is a leading space to make it
1218 possible to append this variable directly after the
1219 read/write command. Note: The "+cmd" argument isn't
1220 included here, because it will be executed anyway.
1221 2. When printing a PostScript file with ":hardcopy" this is
1222 the argument for the ":hardcopy" command. This can be used
1223 in 'printexpr'.
1225 *v:cmdbang* *cmdbang-variable*
1226 v:cmdbang Set like v:cmdarg for a file read/write command. When a "!"
1227 was used the value is 1, otherwise it is 0. Note that this
1228 can only be used in autocommands. For user commands |<bang>|
1229 can be used.
1231 *v:count* *count-variable*
1232 v:count The count given for the last Normal mode command. Can be used
1233 to get the count before a mapping. Read-only. Example: >
1234 :map _x :<C-U>echo "the count is " . v:count<CR>
1235 < Note: The <C-U> is required to remove the line range that you
1236 get when typing ':' after a count.
1237 Also used for evaluating the 'formatexpr' option.
1238 "count" also works, for backwards compatibility.
1240 *v:count1* *count1-variable*
1241 v:count1 Just like "v:count", but defaults to one when no count is
1242 used.
1244 *v:ctype* *ctype-variable*
1245 v:ctype The current locale setting for characters of the runtime
1246 environment. This allows Vim scripts to be aware of the
1247 current locale encoding. Technical: it's the value of
1248 LC_CTYPE. When not using a locale the value is "C".
1249 This variable can not be set directly, use the |:language|
1250 command.
1251 See |multi-lang|.
1253 *v:dying* *dying-variable*
1254 v:dying Normally zero. When a deadly signal is caught it's set to
1255 one. When multiple signals are caught the number increases.
1256 Can be used in an autocommand to check if Vim didn't
1257 terminate normally. {only works on Unix}
1258 Example: >
1259 :au VimLeave * if v:dying | echo "\nAAAAaaaarrrggghhhh!!!\n" | endif
1260 <
1261 *v:errmsg* *errmsg-variable*
1262 v:errmsg Last given error message. It's allowed to set this variable.
1263 Example: >
1264 :let v:errmsg = ""
1265 :silent! next
1266 :if v:errmsg != ""
1267 : ... handle error
1268 < "errmsg" also works, for backwards compatibility.
1270 *v:exception* *exception-variable*
1271 v:exception The value of the exception most recently caught and not
1272 finished. See also |v:throwpoint| and |throw-variables|.
1273 Example: >
1274 :try
1275 : throw "oops"
1276 :catch /.*/
1277 : echo "caught" v:exception
1278 :endtry
1279 < Output: "caught oops".
1281 *v:fcs_reason* *fcs_reason-variable*
1282 v:fcs_reason The reason why the |FileChangedShell| event was triggered.
1283 Can be used in an autocommand to decide what to do and/or what
1284 to set v:fcs_choice to. Possible values:
1285 deleted file no longer exists
1286 conflict file contents, mode or timestamp was
1287 changed and buffer is modified
1288 changed file contents has changed
1289 mode mode of file changed
1290 time only file timestamp changed
1292 *v:fcs_choice* *fcs_choice-variable*
1293 v:fcs_choice What should happen after a |FileChangedShell| event was
1294 triggered. Can be used in an autocommand to tell Vim what to
1295 do with the affected buffer:
1296 reload Reload the buffer (does not work if
1297 the file was deleted).
1298 ask Ask the user what to do, as if there
1299 was no autocommand. Except that when
1300 only the timestamp changed nothing
1301 will happen.
1302 <empty> Nothing, the autocommand should do
1303 everything that needs to be done.
1304 The default is empty. If another (invalid) value is used then
1305 Vim behaves like it is empty, there is no warning message.
1307 *v:fname_in* *fname_in-variable*
1308 v:fname_in The name of the input file. Valid while evaluating:
1309 option used for ~
1310 'charconvert' file to be converted
1311 'diffexpr' original file
1312 'patchexpr' original file
1313 'printexpr' file to be printed
1314 And set to the swap file name for |SwapExists|.
1316 *v:fname_out* *fname_out-variable*
1317 v:fname_out The name of the output file. Only valid while
1318 evaluating:
1319 option used for ~
1320 'charconvert' resulting converted file (*)
1321 'diffexpr' output of diff
1322 'patchexpr' resulting patched file
1323 (*) When doing conversion for a write command (e.g., ":w
1324 file") it will be equal to v:fname_in. When doing conversion
1325 for a read command (e.g., ":e file") it will be a temporary
1326 file and different from v:fname_in.
1328 *v:fname_new* *fname_new-variable*
1329 v:fname_new The name of the new version of the file. Only valid while
1330 evaluating 'diffexpr'.
1332 *v:fname_diff* *fname_diff-variable*
1333 v:fname_diff The name of the diff (patch) file. Only valid while
1334 evaluating 'patchexpr'.
1336 *v:folddashes* *folddashes-variable*
1337 v:folddashes Used for 'foldtext': dashes representing foldlevel of a closed
1338 fold.
1339 Read-only in the |sandbox|. |fold-foldtext|
1341 *v:foldlevel* *foldlevel-variable*
1342 v:foldlevel Used for 'foldtext': foldlevel of closed fold.
1343 Read-only in the |sandbox|. |fold-foldtext|
1345 *v:foldend* *foldend-variable*
1346 v:foldend Used for 'foldtext': last line of closed fold.
1347 Read-only in the |sandbox|. |fold-foldtext|
1349 *v:foldstart* *foldstart-variable*
1350 v:foldstart Used for 'foldtext': first line of closed fold.
1351 Read-only in the |sandbox|. |fold-foldtext|
1353 *v:insertmode* *insertmode-variable*
1354 v:insertmode Used for the |InsertEnter| and |InsertChange| autocommand
1355 events. Values:
1356 i Insert mode
1357 r Replace mode
1358 v Virtual Replace mode
1360 *v:key* *key-variable*
1361 v:key Key of the current item of a |Dictionary|. Only valid while
1362 evaluating the expression used with |map()| and |filter()|.
1363 Read-only.
1365 *v:lang* *lang-variable*
1366 v:lang The current locale setting for messages of the runtime
1367 environment. This allows Vim scripts to be aware of the
1368 current language. Technical: it's the value of LC_MESSAGES.
1369 The value is system dependent.
1370 This variable can not be set directly, use the |:language|
1371 command.
1372 It can be different from |v:ctype| when messages are desired
1373 in a different language than what is used for character
1374 encoding. See |multi-lang|.
1376 *v:lc_time* *lc_time-variable*
1377 v:lc_time The current locale setting for time messages of the runtime
1378 environment. This allows Vim scripts to be aware of the
1379 current language. Technical: it's the value of LC_TIME.
1380 This variable can not be set directly, use the |:language|
1381 command. See |multi-lang|.
1383 *v:lnum* *lnum-variable*
1384 v:lnum Line number for the 'foldexpr' |fold-expr| and 'indentexpr'
1385 expressions, tab page number for 'guitablabel' and
1386 'guitabtooltip'. Only valid while one of these expressions is
1387 being evaluated. Read-only when in the |sandbox|.
1389 *v:mouse_win* *mouse_win-variable*
1390 v:mouse_win Window number for a mouse click obtained with |getchar()|.
1391 First window has number 1, like with |winnr()|. The value is
1392 zero when there was no mouse button click.
1394 *v:mouse_lnum* *mouse_lnum-variable*
1395 v:mouse_lnum Line number for a mouse click obtained with |getchar()|.
1396 This is the text line number, not the screen line number. The
1397 value is zero when there was no mouse button click.
1399 *v:mouse_col* *mouse_col-variable*
1400 v:mouse_col Column number for a mouse click obtained with |getchar()|.
1401 This is the screen column number, like with |virtcol()|. The
1402 value is zero when there was no mouse button click.
1404 *v:operator* *operator-variable*
1405 v:operator The last operator given in Normal mode. This is a single
1406 character except for commands starting with <g> or <z>,
1407 in which case it is two characters. Best used alongside
1408 |v:prevcount| and |v:register|. Useful if you want to cancel
1409 Operator-pending mode and then use the operator, e.g.: >
1410 :omap O <Esc>:call MyMotion(v:operator)<CR>
1411 < The value remains set until another operator is entered, thus
1412 don't expect it to be empty.
1413 v:operator is not set for |:delete|, |:yank| or other Ex
1414 commands.
1415 Read-only.
1417 *v:prevcount* *prevcount-variable*
1418 v:prevcount The count given for the last but one Normal mode command.
1419 This is the v:count value of the previous command. Useful if
1420 you want to cancel Visual or Operator-pending mode and then
1421 use the count, e.g.: >
1422 :vmap % <Esc>:call MyFilter(v:prevcount)<CR>
1423 < Read-only.
1425 *v:profiling* *profiling-variable*
1426 v:profiling Normally zero. Set to one after using ":profile start".
1427 See |profiling|.
1429 *v:progname* *progname-variable*
1430 v:progname Contains the name (with path removed) with which Vim was
1431 invoked. Allows you to do special initialisations for "view",
1432 "evim" etc., or any other name you might symlink to Vim.
1433 Read-only.
1435 *v:register* *register-variable*
1436 v:register The name of the register supplied to the last normal mode
1437 command. Empty if none were supplied. |getreg()| |setreg()|
1439 *v:scrollstart* *scrollstart-variable*
1440 v:scrollstart String describing the script or function that caused the
1441 screen to scroll up. It's only set when it is empty, thus the
1442 first reason is remembered. It is set to "Unknown" for a
1443 typed command.
1444 This can be used to find out why your script causes the
1445 hit-enter prompt.
1447 *v:servername* *servername-variable*
1448 v:servername The resulting registered |x11-clientserver| name if any.
1449 Read-only.
1451 *v:shell_error* *shell_error-variable*
1452 v:shell_error Result of the last shell command. When non-zero, the last
1453 shell command had an error. When zero, there was no problem.
1454 This only works when the shell returns the error code to Vim.
1455 The value -1 is often used when the command could not be
1456 executed. Read-only.
1457 Example: >
1458 :!mv foo bar
1459 :if v:shell_error
1460 : echo 'could not rename "foo" to "bar"!'
1461 :endif
1462 < "shell_error" also works, for backwards compatibility.
1464 *v:statusmsg* *statusmsg-variable*
1465 v:statusmsg Last given status message. It's allowed to set this variable.
1467 *v:swapname* *swapname-variable*
1468 v:swapname Only valid when executing |SwapExists| autocommands: Name of
1469 the swap file found. Read-only.
1471 *v:swapchoice* *swapchoice-variable*
1472 v:swapchoice |SwapExists| autocommands can set this to the selected choice
1473 for handling an existing swap file:
1474 'o' Open read-only
1475 'e' Edit anyway
1476 'r' Recover
1477 'd' Delete swapfile
1478 'q' Quit
1479 'a' Abort
1480 The value should be a single-character string. An empty value
1481 results in the user being asked, as would happen when there is
1482 no SwapExists autocommand. The default is empty.
1484 *v:swapcommand* *swapcommand-variable*
1485 v:swapcommand Normal mode command to be executed after a file has been
1486 opened. Can be used for a |SwapExists| autocommand to have
1487 another Vim open the file and jump to the right place. For
1488 example, when jumping to a tag the value is ":tag tagname\r".
1489 For ":edit +cmd file" the value is ":cmd\r".
1491 *v:termresponse* *termresponse-variable*
1492 v:termresponse The escape sequence returned by the terminal for the |t_RV|
1493 termcap entry. It is set when Vim receives an escape sequence
1494 that starts with ESC [ or CSI and ends in a 'c', with only
1495 digits, ';' and '.' in between.
1496 When this option is set, the TermResponse autocommand event is
1497 fired, so that you can react to the response from the
1498 terminal.
1499 The response from a new xterm is: "<Esc>[ Pp ; Pv ; Pc c". Pp
1500 is the terminal type: 0 for vt100 and 1 for vt220. Pv is the
1501 patch level (since this was introduced in patch 95, it's
1502 always 95 or bigger). Pc is always zero.
1503 {only when compiled with |+termresponse| feature}
1505 *v:this_session* *this_session-variable*
1506 v:this_session Full filename of the last loaded or saved session file. See
1507 |:mksession|. It is allowed to set this variable. When no
1508 session file has been saved, this variable is empty.
1509 "this_session" also works, for backwards compatibility.
1511 *v:throwpoint* *throwpoint-variable*
1512 v:throwpoint The point where the exception most recently caught and not
1513 finished was thrown. Not set when commands are typed. See
1514 also |v:exception| and |throw-variables|.
1515 Example: >
1516 :try
1517 : throw "oops"
1518 :catch /.*/
1519 : echo "Exception from" v:throwpoint
1520 :endtry
1521 < Output: "Exception from test.vim, line 2"
1523 *v:val* *val-variable*
1524 v:val Value of the current item of a |List| or |Dictionary|. Only
1525 valid while evaluating the expression used with |map()| and
1526 |filter()|. Read-only.
1528 *v:version* *version-variable*
1529 v:version Version number of Vim: Major version number times 100 plus
1530 minor version number. Version 5.0 is 500. Version 5.1 (5.01)
1531 is 501. Read-only. "version" also works, for backwards
1532 compatibility.
1533 Use |has()| to check if a certain patch was included, e.g.: >
1534 if has("patch123")
1535 < Note that patch numbers are specific to the version, thus both
1536 version 5.0 and 5.1 may have a patch 123, but these are
1537 completely different.
1539 *v:warningmsg* *warningmsg-variable*
1540 v:warningmsg Last given warning message. It's allowed to set this variable.
1542 ==============================================================================
1543 4. Builtin Functions *functions*
1545 See |function-list| for a list grouped by what the function is used for.
1547 (Use CTRL-] on the function name to jump to the full explanation.)
1549 USAGE RESULT DESCRIPTION ~
1551 add( {list}, {item}) List append {item} to |List| {list}
1552 append( {lnum}, {string}) Number append {string} below line {lnum}
1553 append( {lnum}, {list}) Number append lines {list} below line {lnum}
1554 argc() Number number of files in the argument list
1555 argidx() Number current index in the argument list
1556 argv( {nr}) String {nr} entry of the argument list
1557 argv( ) List the argument list
1558 browse( {save}, {title}, {initdir}, {default})
1559 String put up a file requester
1560 browsedir( {title}, {initdir}) String put up a directory requester
1561 bufexists( {expr}) Number TRUE if buffer {expr} exists
1562 buflisted( {expr}) Number TRUE if buffer {expr} is listed
1563 bufloaded( {expr}) Number TRUE if buffer {expr} is loaded
1564 bufname( {expr}) String Name of the buffer {expr}
1565 bufnr( {expr}) Number Number of the buffer {expr}
1566 bufwinnr( {expr}) Number window number of buffer {expr}
1567 byte2line( {byte}) Number line number at byte count {byte}
1568 byteidx( {expr}, {nr}) Number byte index of {nr}'th char in {expr}
1569 call( {func}, {arglist} [, {dict}])
1570 any call {func} with arguments {arglist}
1571 changenr() Number current change number
1572 char2nr( {expr}) Number ASCII value of first char in {expr}
1573 cindent( {lnum}) Number C indent for line {lnum}
1574 clearmatches() None clear all matches
1575 col( {expr}) Number column nr of cursor or mark
1576 complete({startcol}, {matches}) String set Insert mode completion
1577 complete_add( {expr}) Number add completion match
1578 complete_check() Number check for key typed during completion
1579 confirm( {msg} [, {choices} [, {default} [, {type}]]])
1580 Number number of choice picked by user
1581 copy( {expr}) any make a shallow copy of {expr}
1582 count( {list}, {expr} [, {start} [, {ic}]])
1583 Number count how many {expr} are in {list}
1584 cscope_connection( [{num} , {dbpath} [, {prepend}]])
1585 Number checks existence of cscope connection
1586 cursor( {lnum}, {col} [, {coladd}])
1587 Number move cursor to {lnum}, {col}, {coladd}
1588 cursor( {list}) Number move cursor to position in {list}
1589 deepcopy( {expr}) any make a full copy of {expr}
1590 delete( {fname}) Number delete file {fname}
1591 did_filetype() Number TRUE if FileType autocommand event used
1592 diff_filler( {lnum}) Number diff filler lines about {lnum}
1593 diff_hlID( {lnum}, {col}) Number diff highlighting at {lnum}/{col}
1594 empty( {expr}) Number TRUE if {expr} is empty
1595 escape( {string}, {chars}) String escape {chars} in {string} with '\'
1596 eval( {string}) any evaluate {string} into its value
1597 eventhandler( ) Number TRUE if inside an event handler
1598 executable( {expr}) Number 1 if executable {expr} exists
1599 exists( {expr}) Number TRUE if {expr} exists
1600 extend({expr1}, {expr2} [, {expr3}])
1601 List/Dict insert items of {expr2} into {expr1}
1602 expand( {expr}) String expand special keywords in {expr}
1603 feedkeys( {string} [, {mode}]) Number add key sequence to typeahead buffer
1604 filereadable( {file}) Number TRUE if {file} is a readable file
1605 filewritable( {file}) Number TRUE if {file} is a writable file
1606 filter( {expr}, {string}) List/Dict remove items from {expr} where
1607 {string} is 0
1608 finddir( {name}[, {path}[, {count}]])
1609 String find directory {name} in {path}
1610 findfile( {name}[, {path}[, {count}]])
1611 String find file {name} in {path}
1612 fnameescape( {fname}) String escape special characters in {fname}
1613 fnamemodify( {fname}, {mods}) String modify file name
1614 foldclosed( {lnum}) Number first line of fold at {lnum} if closed
1615 foldclosedend( {lnum}) Number last line of fold at {lnum} if closed
1616 foldlevel( {lnum}) Number fold level at {lnum}
1617 foldtext( ) String line displayed for closed fold
1618 foldtextresult( {lnum}) String text for closed fold at {lnum}
1619 foreground( ) Number bring the Vim window to the foreground
1620 function( {name}) Funcref reference to function {name}
1621 garbagecollect( [at_exit]) none free memory, breaking cyclic references
1622 get( {list}, {idx} [, {def}]) any get item {idx} from {list} or {def}
1623 get( {dict}, {key} [, {def}]) any get item {key} from {dict} or {def}
1624 getbufline( {expr}, {lnum} [, {end}])
1625 List lines {lnum} to {end} of buffer {expr}
1626 getbufvar( {expr}, {varname}) any variable {varname} in buffer {expr}
1627 getchar( [expr]) Number get one character from the user
1628 getcharmod( ) Number modifiers for the last typed character
1629 getcmdline() String return the current command-line
1630 getcmdpos() Number return cursor position in command-line
1631 getcmdtype() String return the current command-line type
1632 getcwd() String the current working directory
1633 getfperm( {fname}) String file permissions of file {fname}
1634 getfsize( {fname}) Number size in bytes of file {fname}
1635 getfontname( [{name}]) String name of font being used
1636 getftime( {fname}) Number last modification time of file
1637 getftype( {fname}) String description of type of file {fname}
1638 getline( {lnum}) String line {lnum} of current buffer
1639 getline( {lnum}, {end}) List lines {lnum} to {end} of current buffer
1640 getloclist({nr}) List list of location list items
1641 getmatches() List list of current matches
1642 getpid() Number process ID of Vim
1643 getpos( {expr}) List position of cursor, mark, etc.
1644 getqflist() List list of quickfix items
1645 getreg( [{regname} [, 1]]) String contents of register
1646 getregtype( [{regname}]) String type of register
1647 gettabwinvar( {tabnr}, {winnr}, {name})
1648 any {name} in {winnr} in tab page {tabnr}
1649 getwinposx() Number X coord in pixels of GUI Vim window
1650 getwinposy() Number Y coord in pixels of GUI Vim window
1651 getwinvar( {nr}, {varname}) any variable {varname} in window {nr}
1652 glob( {expr}) String expand file wildcards in {expr}
1653 globpath( {path}, {expr}) String do glob({expr}) for all dirs in {path}
1654 has( {feature}) Number TRUE if feature {feature} supported
1655 has_key( {dict}, {key}) Number TRUE if {dict} has entry {key}
1656 haslocaldir() Number TRUE if current window executed |:lcd|
1657 hasmapto( {what} [, {mode} [, {abbr}]])
1658 Number TRUE if mapping to {what} exists
1659 histadd( {history},{item}) String add an item to a history
1660 histdel( {history} [, {item}]) String remove an item from a history
1661 histget( {history} [, {index}]) String get the item {index} from a history
1662 histnr( {history}) Number highest index of a history
1663 hlexists( {name}) Number TRUE if highlight group {name} exists
1664 hlID( {name}) Number syntax ID of highlight group {name}
1665 hostname() String name of the machine Vim is running on
1666 iconv( {expr}, {from}, {to}) String convert encoding of {expr}
1667 indent( {lnum}) Number indent of line {lnum}
1668 index( {list}, {expr} [, {start} [, {ic}]])
1669 Number index in {list} where {expr} appears
1670 input( {prompt} [, {text} [, {completion}]])
1671 String get input from the user
1672 inputdialog( {p} [, {t} [, {c}]]) String like input() but in a GUI dialog
1673 inputlist( {textlist}) Number let the user pick from a choice list
1674 inputrestore() Number restore typeahead
1675 inputsave() Number save and clear typeahead
1676 inputsecret( {prompt} [, {text}]) String like input() but hiding the text
1677 insert( {list}, {item} [, {idx}]) List insert {item} in {list} [before {idx}]
1678 isdirectory( {directory}) Number TRUE if {directory} is a directory
1679 islocked( {expr}) Number TRUE if {expr} is locked
1680 items( {dict}) List key-value pairs in {dict}
1681 join( {list} [, {sep}]) String join {list} items into one String
1682 keys( {dict}) List keys in {dict}
1683 len( {expr}) Number the length of {expr}
1684 libcall( {lib}, {func}, {arg}) String call {func} in library {lib} with {arg}
1685 libcallnr( {lib}, {func}, {arg}) Number idem, but return a Number
1686 line( {expr}) Number line nr of cursor, last line or mark
1687 line2byte( {lnum}) Number byte count of line {lnum}
1688 lispindent( {lnum}) Number Lisp indent for line {lnum}
1689 localtime() Number current time
1690 map( {expr}, {string}) List/Dict change each item in {expr} to {expr}
1691 maparg( {name}[, {mode} [, {abbr}]])
1692 String rhs of mapping {name} in mode {mode}
1693 mapcheck( {name}[, {mode} [, {abbr}]])
1694 String check for mappings matching {name}
1695 match( {expr}, {pat}[, {start}[, {count}]])
1696 Number position where {pat} matches in {expr}
1697 matchadd( {group}, {pattern}[, {priority}[, {id}]])
1698 Number highlight {pattern} with {group}
1699 matcharg( {nr}) List arguments of |:match|
1700 matchdelete( {id}) Number delete match identified by {id}
1701 matchend( {expr}, {pat}[, {start}[, {count}]])
1702 Number position where {pat} ends in {expr}
1703 matchlist( {expr}, {pat}[, {start}[, {count}]])
1704 List match and submatches of {pat} in {expr}
1705 matchstr( {expr}, {pat}[, {start}[, {count}]])
1706 String {count}'th match of {pat} in {expr}
1707 max({list}) Number maximum value of items in {list}
1708 min({list}) Number minimum value of items in {list}
1709 mkdir({name} [, {path} [, {prot}]])
1710 Number create directory {name}
1711 mode() String current editing mode
1712 nextnonblank( {lnum}) Number line nr of non-blank line >= {lnum}
1713 nr2char( {expr}) String single char with ASCII value {expr}
1714 pathshorten( {expr}) String shorten directory names in a path
1715 prevnonblank( {lnum}) Number line nr of non-blank line <= {lnum}
1716 printf( {fmt}, {expr1}...) String format text
1717 pumvisible() Number whether popup menu is visible
1718 range( {expr} [, {max} [, {stride}]])
1719 List items from {expr} to {max}
1720 readfile({fname} [, {binary} [, {max}]])
1721 List get list of lines from file {fname}
1722 reltime( [{start} [, {end}]]) List get time value
1723 reltimestr( {time}) String turn time value into a String
1724 remote_expr( {server}, {string} [, {idvar}])
1725 String send expression
1726 remote_foreground( {server}) Number bring Vim server to the foreground
1727 remote_peek( {serverid} [, {retvar}])
1728 Number check for reply string
1729 remote_read( {serverid}) String read reply string
1730 remote_send( {server}, {string} [, {idvar}])
1731 String send key sequence
1732 remove( {list}, {idx} [, {end}]) any remove items {idx}-{end} from {list}
1733 remove( {dict}, {key}) any remove entry {key} from {dict}
1734 rename( {from}, {to}) Number rename (move) file from {from} to {to}
1735 repeat( {expr}, {count}) String repeat {expr} {count} times
1736 resolve( {filename}) String get filename a shortcut points to
1737 reverse( {list}) List reverse {list} in-place
1738 search( {pattern} [, {flags} [, {stopline} [, {timeout}]]])
1739 Number search for {pattern}
1740 searchdecl({name} [, {global} [, {thisblock}]])
1741 Number search for variable declaration
1742 searchpair( {start}, {middle}, {end} [, {flags} [, {skip} [...]]])
1743 Number search for other end of start/end pair
1744 searchpairpos( {start}, {middle}, {end} [, {flags} [, {skip} [...]]])
1745 List search for other end of start/end pair
1746 searchpos( {pattern} [, {flags} [, {stopline} [, {timeout}]]])
1747 List search for {pattern}
1748 server2client( {clientid}, {string})
1749 Number send reply string
1750 serverlist() String get a list of available servers
1751 setbufvar( {expr}, {varname}, {val}) set {varname} in buffer {expr} to {val}
1752 setcmdpos( {pos}) Number set cursor position in command-line
1753 setline( {lnum}, {line}) Number set line {lnum} to {line}
1754 setloclist( {nr}, {list}[, {action}])
1755 Number modify location list using {list}
1756 setmatches( {list}) Number restore a list of matches
1757 setpos( {expr}, {list}) none set the {expr} position to {list}
1758 setqflist( {list}[, {action}]) Number modify quickfix list using {list}
1759 setreg( {n}, {v}[, {opt}]) Number set register to value and type
1760 settabwinvar( {tabnr}, {winnr}, {varname}, {val}) set {varname} in window
1761 {winnr} in tab page {tabnr} to {val}
1762 setwinvar( {nr}, {varname}, {val}) set {varname} in window {nr} to {val}
1763 shellescape( {string}) String escape {string} for use as shell
1764 command argument
1765 simplify( {filename}) String simplify filename as much as possible
1766 sort( {list} [, {func}]) List sort {list}, using {func} to compare
1767 soundfold( {word}) String sound-fold {word}
1768 spellbadword() String badly spelled word at cursor
1769 spellsuggest( {word} [, {max} [, {capital}]])
1770 List spelling suggestions
1771 split( {expr} [, {pat} [, {keepempty}]])
1772 List make |List| from {pat} separated {expr}
1773 str2nr( {expr} [, {base}]) Number convert string to number
1774 strftime( {format}[, {time}]) String time in specified format
1775 stridx( {haystack}, {needle}[, {start}])
1776 Number index of {needle} in {haystack}
1777 string( {expr}) String String representation of {expr} value
1778 strlen( {expr}) Number length of the String {expr}
1779 strpart( {src}, {start}[, {len}])
1780 String {len} characters of {src} at {start}
1781 strridx( {haystack}, {needle} [, {start}])
1782 Number last index of {needle} in {haystack}
1783 strtrans( {expr}) String translate string to make it printable
1784 submatch( {nr}) String specific match in ":substitute"
1785 substitute( {expr}, {pat}, {sub}, {flags})
1786 String all {pat} in {expr} replaced with {sub}
1787 synID( {lnum}, {col}, {trans}) Number syntax ID at {lnum} and {col}
1788 synIDattr( {synID}, {what} [, {mode}])
1789 String attribute {what} of syntax ID {synID}
1790 synIDtrans( {synID}) Number translated syntax ID of {synID}
1791 synstack({lnum}, {col}) List stack of syntax IDs at {lnum} and {col}
1792 system( {expr} [, {input}]) String output of shell command/filter {expr}
1793 tabpagebuflist( [{arg}]) List list of buffer numbers in tab page
1794 tabpagenr( [{arg}]) Number number of current or last tab page
1795 tabpagewinnr( {tabarg}[, {arg}])
1796 Number number of current window in tab page
1797 taglist( {expr}) List list of tags matching {expr}
1798 tagfiles() List tags files used
1799 tempname() String name for a temporary file
1800 tolower( {expr}) String the String {expr} switched to lowercase
1801 toupper( {expr}) String the String {expr} switched to uppercase
1802 tr( {src}, {fromstr}, {tostr}) String translate chars of {src} in {fromstr}
1803 to chars in {tostr}
1804 type( {name}) Number type of variable {name}
1805 values( {dict}) List values in {dict}
1806 virtcol( {expr}) Number screen column of cursor or mark
1807 visualmode( [expr]) String last visual mode used
1808 winbufnr( {nr}) Number buffer number of window {nr}
1809 wincol() Number window column of the cursor
1810 winheight( {nr}) Number height of window {nr}
1811 winline() Number window line of the cursor
1812 winnr( [{expr}]) Number number of current window
1813 winrestcmd() String returns command to restore window sizes
1814 winrestview({dict}) None restore view of current window
1815 winsaveview() Dict save view of current window
1816 winwidth( {nr}) Number width of window {nr}
1817 writefile({list}, {fname} [, {binary}])
1818 Number write list of lines to file {fname}
1820 add({list}, {expr}) *add()*
1821 Append the item {expr} to |List| {list}. Returns the
1822 resulting |List|. Examples: >
1823 :let alist = add([1, 2, 3], item)
1824 :call add(mylist, "woodstock")
1825 < Note that when {expr} is a |List| it is appended as a single
1826 item. Use |extend()| to concatenate |Lists|.
1827 Use |insert()| to add an item at another position.
1830 append({lnum}, {expr}) *append()*
1831 When {expr} is a |List|: Append each item of the |List| as a
1832 text line below line {lnum} in the current buffer.
1833 Otherwise append {expr} as one text line below line {lnum} in
1834 the current buffer.
1835 {lnum} can be zero to insert a line before the first one.
1836 Returns 1 for failure ({lnum} out of range or out of memory),
1837 0 for success. Example: >
1838 :let failed = append(line('$'), "# THE END")
1839 :let failed = append(0, ["Chapter 1", "the beginning"])
1840 <
1841 *argc()*
1842 argc() The result is the number of files in the argument list of the
1843 current window. See |arglist|.
1845 *argidx()*
1846 argidx() The result is the current index in the argument list. 0 is
1847 the first file. argc() - 1 is the last one. See |arglist|.
1849 *argv()*
1850 argv([{nr}]) The result is the {nr}th file in the argument list of the
1851 current window. See |arglist|. "argv(0)" is the first one.
1852 Example: >
1853 :let i = 0
1854 :while i < argc()
1855 : let f = escape(argv(i), '. ')
1856 : exe 'amenu Arg.' . f . ' :e ' . f . '<CR>'
1857 : let i = i + 1
1858 :endwhile
1859 < Without the {nr} argument a |List| with the whole |arglist| is
1860 returned.
1862 *browse()*
1863 browse({save}, {title}, {initdir}, {default})
1864 Put up a file requester. This only works when "has("browse")"
1865 returns non-zero (only in some GUI versions).
1866 The input fields are:
1867 {save} when non-zero, select file to write
1868 {title} title for the requester
1869 {initdir} directory to start browsing in
1870 {default} default file name
1871 When the "Cancel" button is hit, something went wrong, or
1872 browsing is not possible, an empty string is returned.
1874 *browsedir()*
1875 browsedir({title}, {initdir})
1876 Put up a directory requester. This only works when
1877 "has("browse")" returns non-zero (only in some GUI versions).
1878 On systems where a directory browser is not supported a file
1879 browser is used. In that case: select a file in the directory
1880 to be used.
1881 The input fields are:
1882 {title} title for the requester
1883 {initdir} directory to start browsing in
1884 When the "Cancel" button is hit, something went wrong, or
1885 browsing is not possible, an empty string is returned.
1887 bufexists({expr}) *bufexists()*
1888 The result is a Number, which is non-zero if a buffer called
1889 {expr} exists.
1890 If the {expr} argument is a number, buffer numbers are used.
1891 If the {expr} argument is a string it must match a buffer name
1892 exactly. The name can be:
1893 - Relative to the current directory.
1894 - A full path.
1895 - The name of a buffer with 'filetype' set to "nofile".
1896 - A URL name.
1897 Unlisted buffers will be found.
1898 Note that help files are listed by their short name in the
1899 output of |:buffers|, but bufexists() requires using their
1900 long name to be able to find them.
1901 Use "bufexists(0)" to test for the existence of an alternate
1902 file name.
1903 *buffer_exists()*
1904 Obsolete name: buffer_exists().
1906 buflisted({expr}) *buflisted()*
1907 The result is a Number, which is non-zero if a buffer called
1908 {expr} exists and is listed (has the 'buflisted' option set).
1909 The {expr} argument is used like with |bufexists()|.
1911 bufloaded({expr}) *bufloaded()*
1912 The result is a Number, which is non-zero if a buffer called
1913 {expr} exists and is loaded (shown in a window or hidden).
1914 The {expr} argument is used like with |bufexists()|.
1916 bufname({expr}) *bufname()*
1917 The result is the name of a buffer, as it is displayed by the
1918 ":ls" command.
1919 If {expr} is a Number, that buffer number's name is given.
1920 Number zero is the alternate buffer for the current window.
1921 If {expr} is a String, it is used as a |file-pattern| to match
1922 with the buffer names. This is always done like 'magic' is
1923 set and 'cpoptions' is empty. When there is more than one
1924 match an empty string is returned.
1925 "" or "%" can be used for the current buffer, "#" for the
1926 alternate buffer.
1927 A full match is preferred, otherwise a match at the start, end
1928 or middle of the buffer name is accepted. If you only want a
1929 full match then put "^" at the start and "$" at the end of the
1930 pattern.
1931 Listed buffers are found first. If there is a single match
1932 with a listed buffer, that one is returned. Next unlisted
1933 buffers are searched for.
1934 If the {expr} is a String, but you want to use it as a buffer
1935 number, force it to be a Number by adding zero to it: >
1936 :echo bufname("3" + 0)
1937 < If the buffer doesn't exist, or doesn't have a name, an empty
1938 string is returned. >
1939 bufname("#") alternate buffer name
1940 bufname(3) name of buffer 3
1941 bufname("%") name of current buffer
1942 bufname("file2") name of buffer where "file2" matches.
1943 < *buffer_name()*
1944 Obsolete name: buffer_name().
1946 *bufnr()*
1947 bufnr({expr} [, {create}])
1948 The result is the number of a buffer, as it is displayed by
1949 the ":ls" command. For the use of {expr}, see |bufname()|
1950 above.
1951 If the buffer doesn't exist, -1 is returned. Or, if the
1952 {create} argument is present and not zero, a new, unlisted,
1953 buffer is created and its number is returned.
1954 bufnr("$") is the last buffer: >
1955 :let last_buffer = bufnr("$")
1956 < The result is a Number, which is the highest buffer number
1957 of existing buffers. Note that not all buffers with a smaller
1958 number necessarily exist, because ":bwipeout" may have removed
1959 them. Use bufexists() to test for the existence of a buffer.
1960 *buffer_number()*
1961 Obsolete name: buffer_number().
1962 *last_buffer_nr()*
1963 Obsolete name for bufnr("$"): last_buffer_nr().
1965 bufwinnr({expr}) *bufwinnr()*
1966 The result is a Number, which is the number of the first
1967 window associated with buffer {expr}. For the use of {expr},
1968 see |bufname()| above. If buffer {expr} doesn't exist or
1969 there is no such window, -1 is returned. Example: >
1971 echo "A window containing buffer 1 is " . (bufwinnr(1))
1973 < The number can be used with |CTRL-W_w| and ":wincmd w"
1974 |:wincmd|.
1975 Only deals with the current tab page.
1978 byte2line({byte}) *byte2line()*
1979 Return the line number that contains the character at byte
1980 count {byte} in the current buffer. This includes the
1981 end-of-line character, depending on the 'fileformat' option
1982 for the current buffer. The first character has byte count
1983 one.
1984 Also see |line2byte()|, |go| and |:goto|.
1985 {not available when compiled without the |+byte_offset|
1986 feature}
1988 byteidx({expr}, {nr}) *byteidx()*
1989 Return byte index of the {nr}'th character in the string
1990 {expr}. Use zero for the first character, it returns zero.
1991 This function is only useful when there are multibyte
1992 characters, otherwise the returned value is equal to {nr}.
1993 Composing characters are counted as a separate character.
1994 Example : >
1995 echo matchstr(str, ".", byteidx(str, 3))
1996 < will display the fourth character. Another way to do the
1997 same: >
1998 let s = strpart(str, byteidx(str, 3))
1999 echo strpart(s, 0, byteidx(s, 1))
2000 < If there are less than {nr} characters -1 is returned.
2001 If there are exactly {nr} characters the length of the string
2002 is returned.
2004 call({func}, {arglist} [, {dict}]) *call()* *E699*
2005 Call function {func} with the items in |List| {arglist} as
2006 arguments.
2007 {func} can either be a |Funcref| or the name of a function.
2008 a:firstline and a:lastline are set to the cursor line.
2009 Returns the return value of the called function.
2010 {dict} is for functions with the "dict" attribute. It will be
2011 used to set the local variable "self". |Dictionary-function|
2013 changenr() *changenr()*
2014 Return the number of the most recent change. This is the same
2015 number as what is displayed with |:undolist| and can be used
2016 with the |:undo| command.
2017 When a change was made it is the number of that change. After
2018 redo it is the number of the redone change. After undo it is
2019 one less than the number of the undone change.
2021 char2nr({expr}) *char2nr()*
2022 Return number value of the first char in {expr}. Examples: >
2023 char2nr(" ") returns 32
2024 char2nr("ABC") returns 65
2025 < The current 'encoding' is used. Example for "utf-8": >
2026 char2nr("á") returns 225
2027 char2nr("á"[0]) returns 195
2028 < nr2char() does the opposite.
2030 cindent({lnum}) *cindent()*
2031 Get the amount of indent for line {lnum} according the C
2032 indenting rules, as with 'cindent'.
2033 The indent is counted in spaces, the value of 'tabstop' is
2034 relevant. {lnum} is used just like in |getline()|.
2035 When {lnum} is invalid or Vim was not compiled the |+cindent|
2036 feature, -1 is returned.
2037 See |C-indenting|.
2039 clearmatches() *clearmatches()*
2040 Clears all matches previously defined by |matchadd()| and the
2041 |:match| commands.
2043 *col()*
2044 col({expr}) The result is a Number, which is the byte index of the column
2045 position given with {expr}. The accepted positions are:
2046 . the cursor position
2047 $ the end of the cursor line (the result is the
2048 number of characters in the cursor line plus one)
2049 'x position of mark x (if the mark is not set, 0 is
2050 returned)
2051 Additionally {expr} can be [lnum, col]: a |List| with the line
2052 and column number. Most useful when the column is "$", to get
2053 the las column of a specific line. When "lnum" or "col" is
2054 out of range then col() returns zero.
2055 To get the line number use |line()|. To get both use
2056 |getpos()|.
2057 For the screen column position use |virtcol()|.
2058 Note that only marks in the current file can be used.
2059 Examples: >
2060 col(".") column of cursor
2061 col("$") length of cursor line plus one
2062 col("'t") column of mark t
2063 col("'" . markname) column of mark markname
2064 < The first column is 1. 0 is returned for an error.
2065 For an uppercase mark the column may actually be in another
2066 buffer.
2067 For the cursor position, when 'virtualedit' is active, the
2068 column is one higher if the cursor is after the end of the
2069 line. This can be used to obtain the column in Insert mode: >
2070 :imap <F2> <C-O>:let save_ve = &ve<CR>
2071 \<C-O>:set ve=all<CR>
2072 \<C-O>:echo col(".") . "\n" <Bar>
2073 \let &ve = save_ve<CR>
2074 <
2076 complete({startcol}, {matches}) *complete()* *E785*
2077 Set the matches for Insert mode completion.
2078 Can only be used in Insert mode. You need to use a mapping
2079 with CTRL-R = |i_CTRL-R|. It does not work after CTRL-O or
2080 with an expression mapping.
2081 {startcol} is the byte offset in the line where the completed
2082 text start. The text up to the cursor is the original text
2083 that will be replaced by the matches. Use col('.') for an
2084 empty string. "col('.') - 1" will replace one character by a
2085 match.
2086 {matches} must be a |List|. Each |List| item is one match.
2087 See |complete-items| for the kind of items that are possible.
2088 Note that the after calling this function you need to avoid
2089 inserting anything that would completion to stop.
2090 The match can be selected with CTRL-N and CTRL-P as usual with
2091 Insert mode completion. The popup menu will appear if
2092 specified, see |ins-completion-menu|.
2093 Example: >
2094 inoremap <F5> <C-R>=ListMonths()<CR>
2096 func! ListMonths()
2097 call complete(col('.'), ['January', 'February', 'March',
2098 \ 'April', 'May', 'June', 'July', 'August', 'September',
2099 \ 'October', 'November', 'December'])
2100 return ''
2101 endfunc
2102 < This isn't very useful, but it shows how it works. Note that
2103 an empty string is returned to avoid a zero being inserted.
2105 complete_add({expr}) *complete_add()*
2106 Add {expr} to the list of matches. Only to be used by the
2107 function specified with the 'completefunc' option.
2108 Returns 0 for failure (empty string or out of memory),
2109 1 when the match was added, 2 when the match was already in
2110 the list.
2111 See |complete-functions| for an explanation of {expr}. It is
2112 the same as one item in the list that 'omnifunc' would return.
2114 complete_check() *complete_check()*
2115 Check for a key typed while looking for completion matches.
2116 This is to be used when looking for matches takes some time.
2117 Returns non-zero when searching for matches is to be aborted,
2118 zero otherwise.
2119 Only to be used by the function specified with the
2120 'completefunc' option.
2122 *confirm()*
2123 confirm({msg} [, {choices} [, {default} [, {type}]]])
2124 Confirm() offers the user a dialog, from which a choice can be
2125 made. It returns the number of the choice. For the first
2126 choice this is 1.
2127 Note: confirm() is only supported when compiled with dialog
2128 support, see |+dialog_con| and |+dialog_gui|.
2129 {msg} is displayed in a |dialog| with {choices} as the
2130 alternatives. When {choices} is missing or empty, "&OK" is
2131 used (and translated).
2132 {msg} is a String, use '\n' to include a newline. Only on
2133 some systems the string is wrapped when it doesn't fit.
2134 {choices} is a String, with the individual choices separated
2135 by '\n', e.g. >
2136 confirm("Save changes?", "&Yes\n&No\n&Cancel")
2137 < The letter after the '&' is the shortcut key for that choice.
2138 Thus you can type 'c' to select "Cancel". The shortcut does
2139 not need to be the first letter: >
2140 confirm("file has been modified", "&Save\nSave &All")
2141 < For the console, the first letter of each choice is used as
2142 the default shortcut key.
2143 The optional {default} argument is the number of the choice
2144 that is made if the user hits <CR>. Use 1 to make the first
2145 choice the default one. Use 0 to not set a default. If
2146 {default} is omitted, 1 is used.
2147 The optional {type} argument gives the type of dialog. This
2148 is only used for the icon of the Win32 GUI. It can be one of
2149 these values: "Error", "Question", "Info", "Warning" or
2150 "Generic". Only the first character is relevant. When {type}
2151 is omitted, "Generic" is used.
2152 If the user aborts the dialog by pressing <Esc>, CTRL-C,
2153 or another valid interrupt key, confirm() returns 0.
2155 An example: >
2156 :let choice = confirm("What do you want?", "&Apples\n&Oranges\n&Bananas", 2)
2157 :if choice == 0
2158 : echo "make up your mind!"
2159 :elseif choice == 3
2160 : echo "tasteful"
2161 :else
2162 : echo "I prefer bananas myself."
2163 :endif
2164 < In a GUI dialog, buttons are used. The layout of the buttons
2165 depends on the 'v' flag in 'guioptions'. If it is included,
2166 the buttons are always put vertically. Otherwise, confirm()
2167 tries to put the buttons in one horizontal line. If they
2168 don't fit, a vertical layout is used anyway. For some systems
2169 the horizontal layout is always used.
2171 *copy()*
2172 copy({expr}) Make a copy of {expr}. For Numbers and Strings this isn't
2173 different from using {expr} directly.
2174 When {expr} is a |List| a shallow copy is created. This means
2175 that the original |List| can be changed without changing the
2176 copy, and vise versa. But the items are identical, thus
2177 changing an item changes the contents of both |Lists|. Also
2178 see |deepcopy()|.
2180 count({comp}, {expr} [, {ic} [, {start}]]) *count()*
2181 Return the number of times an item with value {expr} appears
2182 in |List| or |Dictionary| {comp}.
2183 If {start} is given then start with the item with this index.
2184 {start} can only be used with a |List|.
2185 When {ic} is given and it's non-zero then case is ignored.
2188 *cscope_connection()*
2189 cscope_connection([{num} , {dbpath} [, {prepend}]])
2190 Checks for the existence of a |cscope| connection. If no
2191 parameters are specified, then the function returns:
2192 0, if cscope was not available (not compiled in), or
2193 if there are no cscope connections;
2194 1, if there is at least one cscope connection.
2196 If parameters are specified, then the value of {num}
2197 determines how existence of a cscope connection is checked:
2199 {num} Description of existence check
2200 ----- ------------------------------
2201 0 Same as no parameters (e.g., "cscope_connection()").
2202 1 Ignore {prepend}, and use partial string matches for
2203 {dbpath}.
2204 2 Ignore {prepend}, and use exact string matches for
2205 {dbpath}.
2206 3 Use {prepend}, use partial string matches for both
2207 {dbpath} and {prepend}.
2208 4 Use {prepend}, use exact string matches for both
2209 {dbpath} and {prepend}.
2211 Note: All string comparisons are case sensitive!
2213 Examples. Suppose we had the following (from ":cs show"): >
2215 # pid database name prepend path
2216 0 27664 cscope.out /usr/local
2217 <
2218 Invocation Return Val ~
2219 ---------- ---------- >
2220 cscope_connection() 1
2221 cscope_connection(1, "out") 1
2222 cscope_connection(2, "out") 0
2223 cscope_connection(3, "out") 0
2224 cscope_connection(3, "out", "local") 1
2225 cscope_connection(4, "out") 0
2226 cscope_connection(4, "out", "local") 0
2227 cscope_connection(4, "cscope.out", "/usr/local") 1
2228 <
2229 cursor({lnum}, {col} [, {off}]) *cursor()*
2230 cursor({list})
2231 Positions the cursor at the column (byte count) {col} in the
2232 line {lnum}. The first column is one.
2233 When there is one argument {list} this is used as a |List|
2234 with two or three items {lnum}, {col} and {off}. This is like
2235 the return value of |getpos()|, but without the first item.
2236 Does not change the jumplist.
2237 If {lnum} is greater than the number of lines in the buffer,
2238 the cursor will be positioned at the last line in the buffer.
2239 If {lnum} is zero, the cursor will stay in the current line.
2240 If {col} is greater than the number of bytes in the line,
2241 the cursor will be positioned at the last character in the
2242 line.
2243 If {col} is zero, the cursor will stay in the current column.
2244 When 'virtualedit' is used {off} specifies the offset in
2245 screen columns from the start of the character. E.g., a
2246 position within a <Tab> or after the last character.
2249 deepcopy({expr}[, {noref}]) *deepcopy()* *E698*
2250 Make a copy of {expr}. For Numbers and Strings this isn't
2251 different from using {expr} directly.
2252 When {expr} is a |List| a full copy is created. This means
2253 that the original |List| can be changed without changing the
2254 copy, and vise versa. When an item is a |List|, a copy for it
2255 is made, recursively. Thus changing an item in the copy does
2256 not change the contents of the original |List|.
2257 When {noref} is omitted or zero a contained |List| or
2258 |Dictionary| is only copied once. All references point to
2259 this single copy. With {noref} set to 1 every occurrence of a
2260 |List| or |Dictionary| results in a new copy. This also means
2261 that a cyclic reference causes deepcopy() to fail.
2262 *E724*
2263 Nesting is possible up to 100 levels. When there is an item
2264 that refers back to a higher level making a deep copy with
2265 {noref} set to 1 will fail.
2266 Also see |copy()|.
2268 delete({fname}) *delete()*
2269 Deletes the file by the name {fname}. The result is a Number,
2270 which is 0 if the file was deleted successfully, and non-zero
2271 when the deletion failed.
2272 Use |remove()| to delete an item from a |List|.
2274 *did_filetype()*
2275 did_filetype() Returns non-zero when autocommands are being executed and the
2276 FileType event has been triggered at least once. Can be used
2277 to avoid triggering the FileType event again in the scripts
2278 that detect the file type. |FileType|
2279 When editing another file, the counter is reset, thus this
2280 really checks if the FileType event has been triggered for the
2281 current buffer. This allows an autocommand that starts
2282 editing another buffer to set 'filetype' and load a syntax
2283 file.
2285 diff_filler({lnum}) *diff_filler()*
2286 Returns the number of filler lines above line {lnum}.
2287 These are the lines that were inserted at this point in
2288 another diff'ed window. These filler lines are shown in the
2289 display but don't exist in the buffer.
2290 {lnum} is used like with |getline()|. Thus "." is the current
2291 line, "'m" mark m, etc.
2292 Returns 0 if the current window is not in diff mode.
2294 diff_hlID({lnum}, {col}) *diff_hlID()*
2295 Returns the highlight ID for diff mode at line {lnum} column
2296 {col} (byte index). When the current line does not have a
2297 diff change zero is returned.
2298 {lnum} is used like with |getline()|. Thus "." is the current
2299 line, "'m" mark m, etc.
2300 {col} is 1 for the leftmost column, {lnum} is 1 for the first
2301 line.
2302 The highlight ID can be used with |synIDattr()| to obtain
2303 syntax information about the highlighting.
2305 empty({expr}) *empty()*
2306 Return the Number 1 if {expr} is empty, zero otherwise.
2307 A |List| or |Dictionary| is empty when it does not have any
2308 items. A Number is empty when its value is zero.
2309 For a long |List| this is much faster then comparing the
2310 length with zero.
2312 escape({string}, {chars}) *escape()*
2313 Escape the characters in {chars} that occur in {string} with a
2314 backslash. Example: >
2315 :echo escape('c:\program files\vim', ' \')
2316 < results in: >
2317 c:\\program\ files\\vim
2319 < *eval()*
2320 eval({string}) Evaluate {string} and return the result. Especially useful to
2321 turn the result of |string()| back into the original value.
2322 This works for Numbers, Strings and composites of them.
2323 Also works for |Funcref|s that refer to existing functions.
2325 eventhandler() *eventhandler()*
2326 Returns 1 when inside an event handler. That is that Vim got
2327 interrupted while waiting for the user to type a character,
2328 e.g., when dropping a file on Vim. This means interactive
2329 commands cannot be used. Otherwise zero is returned.
2331 executable({expr}) *executable()*
2332 This function checks if an executable with the name {expr}
2333 exists. {expr} must be the name of the program without any
2334 arguments.
2335 executable() uses the value of $PATH and/or the normal
2336 searchpath for programs. *PATHEXT*
2337 On MS-DOS and MS-Windows the ".exe", ".bat", etc. can
2338 optionally be included. Then the extensions in $PATHEXT are
2339 tried. Thus if "foo.exe" does not exist, "foo.exe.bat" can be
2340 found. If $PATHEXT is not set then ".exe;.com;.bat;.cmd" is
2341 used. A dot by itself can be used in $PATHEXT to try using
2342 the name without an extension. When 'shell' looks like a
2343 Unix shell, then the name is also tried without adding an
2344 extension.
2345 On MS-DOS and MS-Windows it only checks if the file exists and
2346 is not a directory, not if it's really executable.
2347 On MS-Windows an executable in the same directory as Vim is
2348 always found. Since this directory is added to $PATH it
2349 should also work to execute it |win32-PATH|.
2350 The result is a Number:
2351 1 exists
2352 0 does not exist
2353 -1 not implemented on this system
2355 *exists()*
2356 exists({expr}) The result is a Number, which is non-zero if {expr} is
2357 defined, zero otherwise. The {expr} argument is a string,
2358 which contains one of these:
2359 &option-name Vim option (only checks if it exists,
2360 not if it really works)
2361 +option-name Vim option that works.
2362 $ENVNAME environment variable (could also be
2363 done by comparing with an empty
2364 string)
2365 *funcname built-in function (see |functions|)
2366 or user defined function (see
2367 |user-functions|).
2368 varname internal variable (see
2369 |internal-variables|). Also works
2370 for |curly-braces-names|, |Dictionary|
2371 entries, |List| items, etc. Beware
2372 that this may cause functions to be
2373 invoked cause an error message for an
2374 invalid expression.
2375 :cmdname Ex command: built-in command, user
2376 command or command modifier |:command|.
2377 Returns:
2378 1 for match with start of a command
2379 2 full match with a command
2380 3 matches several user commands
2381 To check for a supported command
2382 always check the return value to be 2.
2383 :2match The |:2match| command.
2384 :3match The |:3match| command.
2385 #event autocommand defined for this event
2386 #event#pattern autocommand defined for this event and
2387 pattern (the pattern is taken
2388 literally and compared to the
2389 autocommand patterns character by
2390 character)
2391 #group autocommand group exists
2392 #group#event autocommand defined for this group and
2393 event.
2394 #group#event#pattern
2395 autocommand defined for this group,
2396 event and pattern.
2397 ##event autocommand for this event is
2398 supported.
2399 For checking for a supported feature use |has()|.
2401 Examples: >
2402 exists("&shortname")
2403 exists("$HOSTNAME")
2404 exists("*strftime")
2405 exists("*s:MyFunc")
2406 exists("bufcount")
2407 exists(":Make")
2408 exists("#CursorHold")
2409 exists("#BufReadPre#*.gz")
2410 exists("#filetypeindent")
2411 exists("#filetypeindent#FileType")
2412 exists("#filetypeindent#FileType#*")
2413 exists("##ColorScheme")
2414 < There must be no space between the symbol (&/$/*/#) and the
2415 name.
2416 There must be no extra characters after the name, although in
2417 a few cases this is ignored. That may become more strict in
2418 the future, thus don't count on it!
2419 Working example: >
2420 exists(":make")
2421 < NOT working example: >
2422 exists(":make install")
2424 < Note that the argument must be a string, not the name of the
2425 variable itself. For example: >
2426 exists(bufcount)
2427 < This doesn't check for existence of the "bufcount" variable,
2428 but gets the value of "bufcount", and checks if that exists.
2430 expand({expr} [, {flag}]) *expand()*
2431 Expand wildcards and the following special keywords in {expr}.
2432 The result is a String.
2434 When there are several matches, they are separated by <NL>
2435 characters. [Note: in version 5.0 a space was used, which
2436 caused problems when a file name contains a space]
2438 If the expansion fails, the result is an empty string. A name
2439 for a non-existing file is not included.
2441 When {expr} starts with '%', '#' or '<', the expansion is done
2442 like for the |cmdline-special| variables with their associated
2443 modifiers. Here is a short overview:
2445 % current file name
2446 # alternate file name
2447 #n alternate file name n
2448 <cfile> file name under the cursor
2449 <afile> autocmd file name
2450 <abuf> autocmd buffer number (as a String!)
2451 <amatch> autocmd matched name
2452 <sfile> sourced script file name
2453 <cword> word under the cursor
2454 <cWORD> WORD under the cursor
2455 <client> the {clientid} of the last received
2456 message |server2client()|
2457 Modifiers:
2458 :p expand to full path
2459 :h head (last path component removed)
2460 :t tail (last path component only)
2461 :r root (one extension removed)
2462 :e extension only
2464 Example: >
2465 :let &tags = expand("%:p:h") . "/tags"
2466 < Note that when expanding a string that starts with '%', '#' or
2467 '<', any following text is ignored. This does NOT work: >
2468 :let doesntwork = expand("%:h.bak")
2469 < Use this: >
2470 :let doeswork = expand("%:h") . ".bak"
2471 < Also note that expanding "<cfile>" and others only returns the
2472 referenced file name without further expansion. If "<cfile>"
2473 is "~/.cshrc", you need to do another expand() to have the
2474 "~/" expanded into the path of the home directory: >
2475 :echo expand(expand("<cfile>"))
2476 <
2477 There cannot be white space between the variables and the
2478 following modifier. The |fnamemodify()| function can be used
2479 to modify normal file names.
2481 When using '%' or '#', and the current or alternate file name
2482 is not defined, an empty string is used. Using "%:p" in a
2483 buffer with no name, results in the current directory, with a
2484 '/' added.
2486 When {expr} does not start with '%', '#' or '<', it is
2487 expanded like a file name is expanded on the command line.
2488 'suffixes' and 'wildignore' are used, unless the optional
2489 {flag} argument is given and it is non-zero. Names for
2490 non-existing files are included. The "**" item can be used to
2491 search in a directory tree. For example, to find all "README"
2492 files in the current directory and below: >
2493 :echo expand("**/README")
2494 <
2495 Expand() can also be used to expand variables and environment
2496 variables that are only known in a shell. But this can be
2497 slow, because a shell must be started. See |expr-env-expand|.
2498 The expanded variable is still handled like a list of file
2499 names. When an environment variable cannot be expanded, it is
2500 left unchanged. Thus ":echo expand('$FOOBAR')" results in
2501 "$FOOBAR".
2503 See |glob()| for finding existing files. See |system()| for
2504 getting the raw output of an external command.
2506 extend({expr1}, {expr2} [, {expr3}]) *extend()*
2507 {expr1} and {expr2} must be both |Lists| or both
2508 |Dictionaries|.
2510 If they are |Lists|: Append {expr2} to {expr1}.
2511 If {expr3} is given insert the items of {expr2} before item
2512 {expr3} in {expr1}. When {expr3} is zero insert before the
2513 first item. When {expr3} is equal to len({expr1}) then
2514 {expr2} is appended.
2515 Examples: >
2516 :echo sort(extend(mylist, [7, 5]))
2517 :call extend(mylist, [2, 3], 1)
2518 < Use |add()| to concatenate one item to a list. To concatenate
2519 two lists into a new list use the + operator: >
2520 :let newlist = [1, 2, 3] + [4, 5]
2521 <
2522 If they are |Dictionaries|:
2523 Add all entries from {expr2} to {expr1}.
2524 If a key exists in both {expr1} and {expr2} then {expr3} is
2525 used to decide what to do:
2526 {expr3} = "keep": keep the value of {expr1}
2527 {expr3} = "force": use the value of {expr2}
2528 {expr3} = "error": give an error message *E737*
2529 When {expr3} is omitted then "force" is assumed.
2531 {expr1} is changed when {expr2} is not empty. If necessary
2532 make a copy of {expr1} first.
2533 {expr2} remains unchanged.
2534 Returns {expr1}.
2537 feedkeys({string} [, {mode}]) *feedkeys()*
2538 Characters in {string} are queued for processing as if they
2539 come from a mapping or were typed by the user. They are added
2540 to the end of the typeahead buffer, thus if a mapping is still
2541 being executed these characters come after them.
2542 The function does not wait for processing of keys contained in
2543 {string}.
2544 To include special keys into {string}, use double-quotes
2545 and "\..." notation |expr-quote|. For example,
2546 feedkeys("\<CR>") simulates pressing of the <Enter> key. But
2547 feedkeys('\<CR>') pushes 5 characters.
2548 If {mode} is absent, keys are remapped.
2549 {mode} is a String, which can contain these character flags:
2550 'm' Remap keys. This is default.
2551 'n' Do not remap keys.
2552 't' Handle keys as if typed; otherwise they are handled as
2553 if coming from a mapping. This matters for undo,
2554 opening folds, etc.
2555 Return value is always 0.
2557 filereadable({file}) *filereadable()*
2558 The result is a Number, which is TRUE when a file with the
2559 name {file} exists, and can be read. If {file} doesn't exist,
2560 or is a directory, the result is FALSE. {file} is any
2561 expression, which is used as a String.
2562 If you don't care about the file being readable you can use
2563 |glob()|.
2564 *file_readable()*
2565 Obsolete name: file_readable().
2568 filewritable({file}) *filewritable()*
2569 The result is a Number, which is 1 when a file with the
2570 name {file} exists, and can be written. If {file} doesn't
2571 exist, or is not writable, the result is 0. If (file) is a
2572 directory, and we can write to it, the result is 2.
2575 filter({expr}, {string}) *filter()*
2576 {expr} must be a |List| or a |Dictionary|.
2577 For each item in {expr} evaluate {string} and when the result
2578 is zero remove the item from the |List| or |Dictionary|.
2579 Inside {string} |v:val| has the value of the current item.
2580 For a |Dictionary| |v:key| has the key of the current item.
2581 Examples: >
2582 :call filter(mylist, 'v:val !~ "OLD"')
2583 < Removes the items where "OLD" appears. >
2584 :call filter(mydict, 'v:key >= 8')
2585 < Removes the items with a key below 8. >
2586 :call filter(var, 0)
2587 < Removes all the items, thus clears the |List| or |Dictionary|.
2589 Note that {string} is the result of expression and is then
2590 used as an expression again. Often it is good to use a
2591 |literal-string| to avoid having to double backslashes.
2593 The operation is done in-place. If you want a |List| or
2594 |Dictionary| to remain unmodified make a copy first: >
2595 :let l = filter(copy(mylist), 'v:val =~ "KEEP"')
2597 < Returns {expr}, the |List| or |Dictionary| that was filtered.
2598 When an error is encountered while evaluating {string} no
2599 further items in {expr} are processed.
2602 finddir({name}[, {path}[, {count}]]) *finddir()*
2603 Find directory {name} in {path}. Supports both downwards and
2604 upwards recursive directory searches. See |file-searching|
2605 for the syntax of {path}.
2606 Returns the path of the first found match. When the found
2607 directory is below the current directory a relative path is
2608 returned. Otherwise a full path is returned.
2609 If {path} is omitted or empty then 'path' is used.
2610 If the optional {count} is given, find {count}'s occurrence of
2611 {name} in {path} instead of the first one.
2612 When {count} is negative return all the matches in a |List|.
2613 This is quite similar to the ex-command |:find|.
2614 {only available when compiled with the +file_in_path feature}
2616 findfile({name}[, {path}[, {count}]]) *findfile()*
2617 Just like |finddir()|, but find a file instead of a directory.
2618 Uses 'suffixesadd'.
2619 Example: >
2620 :echo findfile("tags.vim", ".;")
2621 < Searches from the directory of the current file upwards until
2622 it finds the file "tags.vim".
2624 fnameescape({string}) *fnameescape()*
2625 Escape {string} for use as file name command argument. All
2626 characters that have a special meaning, such as '%' and '|'
2627 are escaped with a backslash.
2628 For most systems the characters escaped are "". For systems
2629 where a backslash appears in a filename, it depends on the
2630 value of 'isfname'.
2631 Example: >
2632 :let fname = 'some str%nge|name'
2633 :exe "edit " . fnameescape(fname)
2634 < results in executing: >
2635 edit some\ str\%nge\|name
2637 fnamemodify({fname}, {mods}) *fnamemodify()*
2638 Modify file name {fname} according to {mods}. {mods} is a
2639 string of characters like it is used for file names on the
2640 command line. See |filename-modifiers|.
2641 Example: >
2642 :echo fnamemodify("main.c", ":p:h")
2643 < results in: >
2644 /home/mool/vim/vim/src
2645 < Note: Environment variables and "~" don't work in {fname}, use
2646 |expand()| first then.
2648 foldclosed({lnum}) *foldclosed()*
2649 The result is a Number. If the line {lnum} is in a closed
2650 fold, the result is the number of the first line in that fold.
2651 If the line {lnum} is not in a closed fold, -1 is returned.
2653 foldclosedend({lnum}) *foldclosedend()*
2654 The result is a Number. If the line {lnum} is in a closed
2655 fold, the result is the number of the last line in that fold.
2656 If the line {lnum} is not in a closed fold, -1 is returned.
2658 foldlevel({lnum}) *foldlevel()*
2659 The result is a Number, which is the foldlevel of line {lnum}
2660 in the current buffer. For nested folds the deepest level is
2661 returned. If there is no fold at line {lnum}, zero is
2662 returned. It doesn't matter if the folds are open or closed.
2663 When used while updating folds (from 'foldexpr') -1 is
2664 returned for lines where folds are still to be updated and the
2665 foldlevel is unknown. As a special case the level of the
2666 previous line is usually available.
2668 *foldtext()*
2669 foldtext() Returns a String, to be displayed for a closed fold. This is
2670 the default function used for the 'foldtext' option and should
2671 only be called from evaluating 'foldtext'. It uses the
2672 |v:foldstart|, |v:foldend| and |v:folddashes| variables.
2673 The returned string looks like this: >
2674 +-- 45 lines: abcdef
2675 < The number of dashes depends on the foldlevel. The "45" is
2676 the number of lines in the fold. "abcdef" is the text in the
2677 first non-blank line of the fold. Leading white space, "//"
2678 or "/*" and the text from the 'foldmarker' and 'commentstring'
2679 options is removed.
2680 {not available when compiled without the |+folding| feature}
2682 foldtextresult({lnum}) *foldtextresult()*
2683 Returns the text that is displayed for the closed fold at line
2684 {lnum}. Evaluates 'foldtext' in the appropriate context.
2685 When there is no closed fold at {lnum} an empty string is
2686 returned.
2687 {lnum} is used like with |getline()|. Thus "." is the current
2688 line, "'m" mark m, etc.
2689 Useful when exporting folded text, e.g., to HTML.
2690 {not available when compiled without the |+folding| feature}
2692 *foreground()*
2693 foreground() Move the Vim window to the foreground. Useful when sent from
2694 a client to a Vim server. |remote_send()|
2695 On Win32 systems this might not work, the OS does not always
2696 allow a window to bring itself to the foreground. Use
2697 |remote_foreground()| instead.
2698 {only in the Win32, Athena, Motif and GTK GUI versions and the
2699 Win32 console version}
2702 function({name}) *function()* *E700*
2703 Return a |Funcref| variable that refers to function {name}.
2704 {name} can be a user defined function or an internal function.
2707 garbagecollect([at_exit]) *garbagecollect()*
2708 Cleanup unused |Lists| and |Dictionaries| that have circular
2709 references. There is hardly ever a need to invoke this
2710 function, as it is automatically done when Vim runs out of
2711 memory or is waiting for the user to press a key after
2712 'updatetime'. Items without circular references are always
2713 freed when they become unused.
2714 This is useful if you have deleted a very big |List| and/or
2715 |Dictionary| with circular references in a script that runs
2716 for a long time.
2717 When the optional "at_exit" argument is one, garbage
2718 collection will also be done when exiting Vim, if it wasn't
2719 done before. This is useful when checking for memory leaks.
2721 get({list}, {idx} [, {default}]) *get()*
2722 Get item {idx} from |List| {list}. When this item is not
2723 available return {default}. Return zero when {default} is
2724 omitted.
2725 get({dict}, {key} [, {default}])
2726 Get item with key {key} from |Dictionary| {dict}. When this
2727 item is not available return {default}. Return zero when
2728 {default} is omitted.
2730 *getbufline()*
2731 getbufline({expr}, {lnum} [, {end}])
2732 Return a |List| with the lines starting from {lnum} to {end}
2733 (inclusive) in the buffer {expr}. If {end} is omitted, a
2734 |List| with only the line {lnum} is returned.
2736 For the use of {expr}, see |bufname()| above.
2738 For {lnum} and {end} "$" can be used for the last line of the
2739 buffer. Otherwise a number must be used.
2741 When {lnum} is smaller than 1 or bigger than the number of
2742 lines in the buffer, an empty |List| is returned.
2744 When {end} is greater than the number of lines in the buffer,
2745 it is treated as {end} is set to the number of lines in the
2746 buffer. When {end} is before {lnum} an empty |List| is
2747 returned.
2749 This function works only for loaded buffers. For unloaded and
2750 non-existing buffers, an empty |List| is returned.
2752 Example: >
2753 :let lines = getbufline(bufnr("myfile"), 1, "$")
2755 getbufvar({expr}, {varname}) *getbufvar()*
2756 The result is the value of option or local buffer variable
2757 {varname} in buffer {expr}. Note that the name without "b:"
2758 must be used.
2759 This also works for a global or buffer-local option, but it
2760 doesn't work for a global variable, window-local variable or
2761 window-local option.
2762 For the use of {expr}, see |bufname()| above.
2763 When the buffer or variable doesn't exist an empty string is
2764 returned, there is no error message.
2765 Examples: >
2766 :let bufmodified = getbufvar(1, "&mod")
2767 :echo "todo myvar = " . getbufvar("todo", "myvar")
2768 <
2769 getchar([expr]) *getchar()*
2770 Get a single character from the user or input stream.
2771 If [expr] is omitted, wait until a character is available.
2772 If [expr] is 0, only get a character when one is available.
2773 Return zero otherwise.
2774 If [expr] is 1, only check if a character is available, it is
2775 not consumed. Return zero if no character available.
2777 Without {expr} and when {expr} is 0 a whole character or
2778 special key is returned. If it is an 8-bit character, the
2779 result is a number. Use nr2char() to convert it to a String.
2780 Otherwise a String is returned with the encoded character.
2781 For a special key it's a sequence of bytes starting with 0x80
2782 (decimal: 128). This is the same value as the string
2783 "\<Key>", e.g., "\<Left>". The returned value is also a
2784 String when a modifier (shift, control, alt) was used that is
2785 not included in the character.
2787 When {expr} is 1 only the first byte is returned. For a
2788 one-byte character it is the character itself as a number.
2789 Use nr2char() to convert it to a String.
2791 When the user clicks a mouse button, the mouse event will be
2792 returned. The position can then be found in |v:mouse_col|,
2793 |v:mouse_lnum| and |v:mouse_win|. This example positions the
2794 mouse as it would normally happen: >
2795 let c = getchar()
2796 if c == "\<LeftMouse>" && v:mouse_win > 0
2797 exe v:mouse_win . "wincmd w"
2798 exe v:mouse_lnum
2799 exe "normal " . v:mouse_col . "|"
2800 endif
2801 <
2802 There is no prompt, you will somehow have to make clear to the
2803 user that a character has to be typed.
2804 There is no mapping for the character.
2805 Key codes are replaced, thus when the user presses the <Del>
2806 key you get the code for the <Del> key, not the raw character
2807 sequence. Examples: >
2808 getchar() == "\<Del>"
2809 getchar() == "\<S-Left>"
2810 < This example redefines "f" to ignore case: >
2811 :nmap f :call FindChar()<CR>
2812 :function FindChar()
2813 : let c = nr2char(getchar())
2814 : while col('.') < col('$') - 1
2815 : normal l
2816 : if getline('.')[col('.') - 1] ==? c
2817 : break
2818 : endif
2819 : endwhile
2820 :endfunction
2822 getcharmod() *getcharmod()*
2823 The result is a Number which is the state of the modifiers for
2824 the last obtained character with getchar() or in another way.
2825 These values are added together:
2826 2 shift
2827 4 control
2828 8 alt (meta)
2829 16 mouse double click
2830 32 mouse triple click
2831 64 mouse quadruple click
2832 128 Macintosh only: command
2833 Only the modifiers that have not been included in the
2834 character itself are obtained. Thus Shift-a results in "A"
2835 with no modifier.
2837 getcmdline() *getcmdline()*
2838 Return the current command-line. Only works when the command
2839 line is being edited, thus requires use of |c_CTRL-\_e| or
2840 |c_CTRL-R_=|.
2841 Example: >
2842 :cmap <F7> <C-\>eescape(getcmdline(), ' \')<CR>
2843 < Also see |getcmdtype()|, |getcmdpos()| and |setcmdpos()|.
2845 getcmdpos() *getcmdpos()*
2846 Return the position of the cursor in the command line as a
2847 byte count. The first column is 1.
2848 Only works when editing the command line, thus requires use of
2849 |c_CTRL-\_e| or |c_CTRL-R_=|. Returns 0 otherwise.
2850 Also see |getcmdtype()|, |setcmdpos()| and |getcmdline()|.
2852 getcmdtype() *getcmdtype()*
2853 Return the current command-line type. Possible return values
2854 are:
2855 : normal Ex command
2856 > debug mode command |debug-mode|
2857 / forward search command
2858 ? backward search command
2859 @ |input()| command
2860 - |:insert| or |:append| command
2861 Only works when editing the command line, thus requires use of
2862 |c_CTRL-\_e| or |c_CTRL-R_=|. Returns an empty string
2863 otherwise.
2864 Also see |getcmdpos()|, |setcmdpos()| and |getcmdline()|.
2866 *getcwd()*
2867 getcwd() The result is a String, which is the name of the current
2868 working directory.
2870 getfsize({fname}) *getfsize()*
2871 The result is a Number, which is the size in bytes of the
2872 given file {fname}.
2873 If {fname} is a directory, 0 is returned.
2874 If the file {fname} can't be found, -1 is returned.
2875 If the size of {fname} is too big to fit in a Number then -2
2876 is returned.
2878 getfontname([{name}]) *getfontname()*
2879 Without an argument returns the name of the normal font being
2880 used. Like what is used for the Normal highlight group
2881 |hl-Normal|.
2882 With an argument a check is done whether {name} is a valid
2883 font name. If not then an empty string is returned.
2884 Otherwise the actual font name is returned, or {name} if the
2885 GUI does not support obtaining the real name.
2886 Only works when the GUI is running, thus not in your vimrc or
2887 gvimrc file. Use the |GUIEnter| autocommand to use this
2888 function just after the GUI has started.
2889 Note that the GTK 2 GUI accepts any font name, thus checking
2890 for a valid name does not work.
2892 getfperm({fname}) *getfperm()*
2893 The result is a String, which is the read, write, and execute
2894 permissions of the given file {fname}.
2895 If {fname} does not exist or its directory cannot be read, an
2896 empty string is returned.
2897 The result is of the form "rwxrwxrwx", where each group of
2898 "rwx" flags represent, in turn, the permissions of the owner
2899 of the file, the group the file belongs to, and other users.
2900 If a user does not have a given permission the flag for this
2901 is replaced with the string "-". Example: >
2902 :echo getfperm("/etc/passwd")
2903 < This will hopefully (from a security point of view) display
2904 the string "rw-r--r--" or even "rw-------".
2906 getftime({fname}) *getftime()*
2907 The result is a Number, which is the last modification time of
2908 the given file {fname}. The value is measured as seconds
2909 since 1st Jan 1970, and may be passed to strftime(). See also
2910 |localtime()| and |strftime()|.
2911 If the file {fname} can't be found -1 is returned.
2913 getftype({fname}) *getftype()*
2914 The result is a String, which is a description of the kind of
2915 file of the given file {fname}.
2916 If {fname} does not exist an empty string is returned.
2917 Here is a table over different kinds of files and their
2918 results:
2919 Normal file "file"
2920 Directory "dir"
2921 Symbolic link "link"
2922 Block device "bdev"
2923 Character device "cdev"
2924 Socket "socket"
2925 FIFO "fifo"
2926 All other "other"
2927 Example: >
2928 getftype("/home")
2929 < Note that a type such as "link" will only be returned on
2930 systems that support it. On some systems only "dir" and
2931 "file" are returned.
2933 *getline()*
2934 getline({lnum} [, {end}])
2935 Without {end} the result is a String, which is line {lnum}
2936 from the current buffer. Example: >
2937 getline(1)
2938 < When {lnum} is a String that doesn't start with a
2939 digit, line() is called to translate the String into a Number.
2940 To get the line under the cursor: >
2941 getline(".")
2942 < When {lnum} is smaller than 1 or bigger than the number of
2943 lines in the buffer, an empty string is returned.
2945 When {end} is given the result is a |List| where each item is
2946 a line from the current buffer in the range {lnum} to {end},
2947 including line {end}.
2948 {end} is used in the same way as {lnum}.
2949 Non-existing lines are silently omitted.
2950 When {end} is before {lnum} an empty |List| is returned.
2951 Example: >
2952 :let start = line('.')
2953 :let end = search("^$") - 1
2954 :let lines = getline(start, end)
2956 < To get lines from another buffer see |getbufline()|
2958 getloclist({nr}) *getloclist()*
2959 Returns a list with all the entries in the location list for
2960 window {nr}. When {nr} is zero the current window is used.
2961 For a location list window, the displayed location list is
2962 returned. For an invalid window number {nr}, an empty list is
2963 returned. Otherwise, same as getqflist().
2965 getmatches() *getmatches()*
2966 Returns a |List| with all matches previously defined by
2967 |matchadd()| and the |:match| commands. |getmatches()| is
2968 useful in combination with |setmatches()|, as |setmatches()|
2969 can restore a list of matches saved by |getmatches()|.
2970 Example: >
2971 :echo getmatches()
2972 < [{'group': 'MyGroup1', 'pattern': 'TODO',
2973 'priority': 10, 'id': 1}, {'group': 'MyGroup2',
2974 'pattern': 'FIXME', 'priority': 10, 'id': 2}] >
2975 :let m = getmatches()
2976 :call clearmatches()
2977 :echo getmatches()
2978 < [] >
2979 :call setmatches(m)
2980 :echo getmatches()
2981 < [{'group': 'MyGroup1', 'pattern': 'TODO',
2982 'priority': 10, 'id': 1}, {'group': 'MyGroup2',
2983 'pattern': 'FIXME', 'priority': 10, 'id': 2}] >
2984 :unlet m
2985 <
2987 getqflist() *getqflist()*
2988 Returns a list with all the current quickfix errors. Each
2989 list item is a dictionary with these entries:
2990 bufnr number of buffer that has the file name, use
2991 bufname() to get the name
2992 lnum line number in the buffer (first line is 1)
2993 col column number (first column is 1)
2994 vcol non-zero: "col" is visual column
2995 zero: "col" is byte index
2996 nr error number
2997 pattern search pattern used to locate the error
2998 text description of the error
2999 type type of the error, 'E', '1', etc.
3000 valid non-zero: recognized error message
3002 When there is no error list or it's empty an empty list is
3003 returned. Quickfix list entries with non-existing buffer
3004 number are returned with "bufnr" set to zero.
3006 Useful application: Find pattern matches in multiple files and
3007 do something with them: >
3008 :vimgrep /theword/jg *.c
3009 :for d in getqflist()
3010 : echo bufname(d.bufnr) ':' d.lnum '=' d.text
3011 :endfor
3014 getreg([{regname} [, 1]]) *getreg()*
3015 The result is a String, which is the contents of register
3016 {regname}. Example: >
3017 :let cliptext = getreg('*')
3018 < getreg('=') returns the last evaluated value of the expression
3019 register. (For use in maps.)
3020 getreg('=', 1) returns the expression itself, so that it can
3021 be restored with |setreg()|. For other registers the extra
3022 argument is ignored, thus you can always give it.
3023 If {regname} is not specified, |v:register| is used.
3026 getregtype([{regname}]) *getregtype()*
3027 The result is a String, which is type of register {regname}.
3028 The value will be one of:
3029 "v" for |characterwise| text
3030 "V" for |linewise| text
3031 "<CTRL-V>{width}" for |blockwise-visual| text
3032 0 for an empty or unknown register
3033 <CTRL-V> is one character with value 0x16.
3034 If {regname} is not specified, |v:register| is used.
3036 gettabwinvar({tabnr}, {winnr}, {varname}) *gettabwinvar()*
3037 Get the value of window-local variable {varname} in window
3038 {winnr} in tab page {tabnr}.
3039 When {varname} starts with "&" get the value of a window-local
3040 option.
3041 Tabs are numbered starting with one. For the current tabpage
3042 use |getwinvar()|.
3043 When {winnr} is zero the current window is used.
3044 This also works for a global option, buffer-local option and
3045 window-local option, but it doesn't work for a global variable
3046 or buffer-local variable.
3047 When {varname} is empty a dictionary with all window-local
3048 variables is returned.
3049 Note that {varname} must be the name without "w:".
3050 Examples: >
3051 :let list_is_on = gettabwinvar(1, 2, '&list')
3052 :echo "myvar = " . gettabwinvar(3, 1, 'myvar')
3053 <
3054 *getwinposx()*
3055 getwinposx() The result is a Number, which is the X coordinate in pixels of
3056 the left hand side of the GUI Vim window. The result will be
3057 -1 if the information is not available.
3059 *getwinposy()*
3060 getwinposy() The result is a Number, which is the Y coordinate in pixels of
3061 the top of the GUI Vim window. The result will be -1 if the
3062 information is not available.
3064 getwinvar({winnr}, {varname}) *getwinvar()*
3065 Like |gettabwinvar()| for the current tabpage.
3066 Examples: >
3067 :let list_is_on = getwinvar(2, '&list')
3068 :echo "myvar = " . getwinvar(1, 'myvar')
3069 <
3070 *glob()*
3071 glob({expr}) Expand the file wildcards in {expr}. See |wildcards| for the
3072 use of special characters.
3073 The result is a String.
3074 When there are several matches, they are separated by <NL>
3075 characters.
3076 If the expansion fails, the result is an empty string.
3077 A name for a non-existing file is not included.
3079 For most systems backticks can be used to get files names from
3080 any external command. Example: >
3081 :let tagfiles = glob("`find . -name tags -print`")
3082 :let &tags = substitute(tagfiles, "\n", ",", "g")
3083 < The result of the program inside the backticks should be one
3084 item per line. Spaces inside an item are allowed.
3086 See |expand()| for expanding special Vim variables. See
3087 |system()| for getting the raw output of an external command.
3089 globpath({path}, {expr}) *globpath()*
3090 Perform glob() on all directories in {path} and concatenate
3091 the results. Example: >
3092 :echo globpath(&rtp, "syntax/c.vim")
3093 < {path} is a comma-separated list of directory names. Each
3094 directory name is prepended to {expr} and expanded like with
3095 glob(). A path separator is inserted when needed.
3096 To add a comma inside a directory name escape it with a
3097 backslash. Note that on MS-Windows a directory may have a
3098 trailing backslash, remove it if you put a comma after it.
3099 If the expansion fails for one of the directories, there is no
3100 error message.
3101 The 'wildignore' option applies: Names matching one of the
3102 patterns in 'wildignore' will be skipped.
3104 The "**" item can be used to search in a directory tree.
3105 For example, to find all "README.txt" files in the directories
3106 in 'runtimepath' and below: >
3107 :echo globpath(&rtp, "**/README.txt")
3108 <
3109 *has()*
3110 has({feature}) The result is a Number, which is 1 if the feature {feature} is
3111 supported, zero otherwise. The {feature} argument is a
3112 string. See |feature-list| below.
3113 Also see |exists()|.
3116 has_key({dict}, {key}) *has_key()*
3117 The result is a Number, which is 1 if |Dictionary| {dict} has
3118 an entry with key {key}. Zero otherwise.
3120 haslocaldir() *haslocaldir()*
3121 The result is a Number, which is 1 when the current
3122 window has set a local path via |:lcd|, and 0 otherwise.
3124 hasmapto({what} [, {mode} [, {abbr}]]) *hasmapto()*
3125 The result is a Number, which is 1 if there is a mapping that
3126 contains {what} in somewhere in the rhs (what it is mapped to)
3127 and this mapping exists in one of the modes indicated by
3128 {mode}.
3129 When {abbr} is there and it is non-zero use abbreviations
3130 instead of mappings. Don't forget to specify Insert and/or
3131 Command-line mode.
3132 Both the global mappings and the mappings local to the current
3133 buffer are checked for a match.
3134 If no matching mapping is found 0 is returned.
3135 The following characters are recognized in {mode}:
3136 n Normal mode
3137 v Visual mode
3138 o Operator-pending mode
3139 i Insert mode
3140 l Language-Argument ("r", "f", "t", etc.)
3141 c Command-line mode
3142 When {mode} is omitted, "nvo" is used.
3144 This function is useful to check if a mapping already exists
3145 to a function in a Vim script. Example: >
3146 :if !hasmapto('\ABCdoit')
3147 : map <Leader>d \ABCdoit
3148 :endif
3149 < This installs the mapping to "\ABCdoit" only if there isn't
3150 already a mapping to "\ABCdoit".
3152 histadd({history}, {item}) *histadd()*
3153 Add the String {item} to the history {history} which can be
3154 one of: *hist-names*
3155 "cmd" or ":" command line history
3156 "search" or "/" search pattern history
3157 "expr" or "=" typed expression history
3158 "input" or "@" input line history
3159 If {item} does already exist in the history, it will be
3160 shifted to become the newest entry.
3161 The result is a Number: 1 if the operation was successful,
3162 otherwise 0 is returned.
3164 Example: >
3165 :call histadd("input", strftime("%Y %b %d"))
3166 :let date=input("Enter date: ")
3167 < This function is not available in the |sandbox|.
3169 histdel({history} [, {item}]) *histdel()*
3170 Clear {history}, i.e. delete all its entries. See |hist-names|
3171 for the possible values of {history}.
3173 If the parameter {item} is given as String, this is seen
3174 as regular expression. All entries matching that expression
3175 will be removed from the history (if there are any).
3176 Upper/lowercase must match, unless "\c" is used |/\c|.
3177 If {item} is a Number, it will be interpreted as index, see
3178 |:history-indexing|. The respective entry will be removed
3179 if it exists.
3181 The result is a Number: 1 for a successful operation,
3182 otherwise 0 is returned.
3184 Examples:
3185 Clear expression register history: >
3186 :call histdel("expr")
3187 <
3188 Remove all entries starting with "*" from the search history: >
3189 :call histdel("/", '^\*')
3190 <
3191 The following three are equivalent: >
3192 :call histdel("search", histnr("search"))
3193 :call histdel("search", -1)
3194 :call histdel("search", '^'.histget("search", -1).'$')
3195 <
3196 To delete the last search pattern and use the last-but-one for
3197 the "n" command and 'hlsearch': >
3198 :call histdel("search", -1)
3199 :let @/ = histget("search", -1)
3201 histget({history} [, {index}]) *histget()*
3202 The result is a String, the entry with Number {index} from
3203 {history}. See |hist-names| for the possible values of
3204 {history}, and |:history-indexing| for {index}. If there is
3205 no such entry, an empty String is returned. When {index} is
3206 omitted, the most recent item from the history is used.
3208 Examples:
3209 Redo the second last search from history. >
3210 :execute '/' . histget("search", -2)
3212 < Define an Ex command ":H {num}" that supports re-execution of
3213 the {num}th entry from the output of |:history|. >
3214 :command -nargs=1 H execute histget("cmd", 0+<args>)
3215 <
3216 histnr({history}) *histnr()*
3217 The result is the Number of the current entry in {history}.
3218 See |hist-names| for the possible values of {history}.
3219 If an error occurred, -1 is returned.
3221 Example: >
3222 :let inp_index = histnr("expr")
3223 <
3224 hlexists({name}) *hlexists()*
3225 The result is a Number, which is non-zero if a highlight group
3226 called {name} exists. This is when the group has been
3227 defined in some way. Not necessarily when highlighting has
3228 been defined for it, it may also have been used for a syntax
3229 item.
3230 *highlight_exists()*
3231 Obsolete name: highlight_exists().
3233 *hlID()*
3234 hlID({name}) The result is a Number, which is the ID of the highlight group
3235 with name {name}. When the highlight group doesn't exist,
3236 zero is returned.
3237 This can be used to retrieve information about the highlight
3238 group. For example, to get the background color of the
3239 "Comment" group: >
3240 :echo synIDattr(synIDtrans(hlID("Comment")), "bg")
3241 < *highlightID()*
3242 Obsolete name: highlightID().
3244 hostname() *hostname()*
3245 The result is a String, which is the name of the machine on
3246 which Vim is currently running. Machine names greater than
3247 256 characters long are truncated.
3249 iconv({expr}, {from}, {to}) *iconv()*
3250 The result is a String, which is the text {expr} converted
3251 from encoding {from} to encoding {to}.
3252 When the conversion fails an empty string is returned.
3253 The encoding names are whatever the iconv() library function
3254 can accept, see ":!man 3 iconv".
3255 Most conversions require Vim to be compiled with the |+iconv|
3256 feature. Otherwise only UTF-8 to latin1 conversion and back
3257 can be done.
3258 This can be used to display messages with special characters,
3259 no matter what 'encoding' is set to. Write the message in
3260 UTF-8 and use: >
3261 echo iconv(utf8_str, "utf-8", &enc)
3262 < Note that Vim uses UTF-8 for all Unicode encodings, conversion
3263 from/to UCS-2 is automatically changed to use UTF-8. You
3264 cannot use UCS-2 in a string anyway, because of the NUL bytes.
3265 {only available when compiled with the +multi_byte feature}
3267 *indent()*
3268 indent({lnum}) The result is a Number, which is indent of line {lnum} in the
3269 current buffer. The indent is counted in spaces, the value
3270 of 'tabstop' is relevant. {lnum} is used just like in
3271 |getline()|.
3272 When {lnum} is invalid -1 is returned.
3275 index({list}, {expr} [, {start} [, {ic}]]) *index()*
3276 Return the lowest index in |List| {list} where the item has a
3277 value equal to {expr}.
3278 If {start} is given then start looking at the item with index
3279 {start} (may be negative for an item relative to the end).
3280 When {ic} is given and it is non-zero, ignore case. Otherwise
3281 case must match.
3282 -1 is returned when {expr} is not found in {list}.
3283 Example: >
3284 :let idx = index(words, "the")
3285 :if index(numbers, 123) >= 0
3288 input({prompt} [, {text} [, {completion}]]) *input()*
3289 The result is a String, which is whatever the user typed on
3290 the command-line. The parameter is either a prompt string, or
3291 a blank string (for no prompt). A '\n' can be used in the
3292 prompt to start a new line.
3293 The highlighting set with |:echohl| is used for the prompt.
3294 The input is entered just like a command-line, with the same
3295 editing commands and mappings. There is a separate history
3296 for lines typed for input().
3297 Example: >
3298 :if input("Coffee or beer? ") == "beer"
3299 : echo "Cheers!"
3300 :endif
3301 <
3302 If the optional {text} is present and not empty, this is used
3303 for the default reply, as if the user typed this. Example: >
3304 :let color = input("Color? ", "white")
3306 < The optional {completion} argument specifies the type of
3307 completion supported for the input. Without it completion is
3308 not performed. The supported completion types are the same as
3309 that can be supplied to a user-defined command using the
3310 "-complete=" argument. Refer to |:command-completion| for
3311 more information. Example: >
3312 let fname = input("File: ", "", "file")
3313 <
3314 NOTE: This function must not be used in a startup file, for
3315 the versions that only run in GUI mode (e.g., the Win32 GUI).
3316 Note: When input() is called from within a mapping it will
3317 consume remaining characters from that mapping, because a
3318 mapping is handled like the characters were typed.
3319 Use |inputsave()| before input() and |inputrestore()|
3320 after input() to avoid that. Another solution is to avoid
3321 that further characters follow in the mapping, e.g., by using
3322 |:execute| or |:normal|.
3324 Example with a mapping: >
3325 :nmap \x :call GetFoo()<CR>:exe "/" . Foo<CR>
3326 :function GetFoo()
3327 : call inputsave()
3328 : let g:Foo = input("enter search pattern: ")
3329 : call inputrestore()
3330 :endfunction
3332 inputdialog({prompt} [, {text} [, {cancelreturn}]]) *inputdialog()*
3333 Like input(), but when the GUI is running and text dialogs are
3334 supported, a dialog window pops up to input the text.
3335 Example: >
3336 :let n = inputdialog("value for shiftwidth", &sw)
3337 :if n != ""
3338 : let &sw = n
3339 :endif
3340 < When the dialog is cancelled {cancelreturn} is returned. When
3341 omitted an empty string is returned.
3342 Hitting <Enter> works like pressing the OK button. Hitting
3343 <Esc> works like pressing the Cancel button.
3344 NOTE: Command-line completion is not supported.
3346 inputlist({textlist}) *inputlist()*
3347 {textlist} must be a |List| of strings. This |List| is
3348 displayed, one string per line. The user will be prompted to
3349 enter a number, which is returned.
3350 The user can also select an item by clicking on it with the
3351 mouse. For the first string 0 is returned. When clicking
3352 above the first item a negative number is returned. When
3353 clicking on the prompt one more than the length of {textlist}
3354 is returned.
3355 Make sure {textlist} has less then 'lines' entries, otherwise
3356 it won't work. It's a good idea to put the entry number at
3357 the start of the string. And put a prompt in the first item.
3358 Example: >
3359 let color = inputlist(['Select color:', '1. red',
3360 \ '2. green', '3. blue'])
3362 inputrestore() *inputrestore()*
3363 Restore typeahead that was saved with a previous inputsave().
3364 Should be called the same number of times inputsave() is
3365 called. Calling it more often is harmless though.
3366 Returns 1 when there is nothing to restore, 0 otherwise.
3368 inputsave() *inputsave()*
3369 Preserve typeahead (also from mappings) and clear it, so that
3370 a following prompt gets input from the user. Should be
3371 followed by a matching inputrestore() after the prompt. Can
3372 be used several times, in which case there must be just as
3373 many inputrestore() calls.
3374 Returns 1 when out of memory, 0 otherwise.
3376 inputsecret({prompt} [, {text}]) *inputsecret()*
3377 This function acts much like the |input()| function with but
3378 two exceptions:
3379 a) the user's response will be displayed as a sequence of
3380 asterisks ("*") thereby keeping the entry secret, and
3381 b) the user's response will not be recorded on the input
3382 |history| stack.
3383 The result is a String, which is whatever the user actually
3384 typed on the command-line in response to the issued prompt.
3385 NOTE: Command-line completion is not supported.
3387 insert({list}, {item} [, {idx}]) *insert()*
3388 Insert {item} at the start of |List| {list}.
3389 If {idx} is specified insert {item} before the item with index
3390 {idx}. If {idx} is zero it goes before the first item, just
3391 like omitting {idx}. A negative {idx} is also possible, see
3392 |list-index|. -1 inserts just before the last item.
3393 Returns the resulting |List|. Examples: >
3394 :let mylist = insert([2, 3, 5], 1)
3395 :call insert(mylist, 4, -1)
3396 :call insert(mylist, 6, len(mylist))
3397 < The last example can be done simpler with |add()|.
3398 Note that when {item} is a |List| it is inserted as a single
3399 item. Use |extend()| to concatenate |Lists|.
3401 isdirectory({directory}) *isdirectory()*
3402 The result is a Number, which is non-zero when a directory
3403 with the name {directory} exists. If {directory} doesn't
3404 exist, or isn't a directory, the result is FALSE. {directory}
3405 is any expression, which is used as a String.
3407 islocked({expr}) *islocked()* *E786*
3408 The result is a Number, which is non-zero when {expr} is the
3409 name of a locked variable.
3410 {expr} must be the name of a variable, |List| item or
3411 |Dictionary| entry, not the variable itself! Example: >
3412 :let alist = [0, ['a', 'b'], 2, 3]
3413 :lockvar 1 alist
3414 :echo islocked('alist') " 1
3415 :echo islocked('alist[1]') " 0
3417 < When {expr} is a variable that does not exist you get an error
3418 message. Use |exists()| to check for existence.
3420 items({dict}) *items()*
3421 Return a |List| with all the key-value pairs of {dict}. Each
3422 |List| item is a list with two items: the key of a {dict}
3423 entry and the value of this entry. The |List| is in arbitrary
3424 order.
3427 join({list} [, {sep}]) *join()*
3428 Join the items in {list} together into one String.
3429 When {sep} is specified it is put in between the items. If
3430 {sep} is omitted a single space is used.
3431 Note that {sep} is not added at the end. You might want to
3432 add it there too: >
3433 let lines = join(mylist, "\n") . "\n"
3434 < String items are used as-is. |Lists| and |Dictionaries| are
3435 converted into a string like with |string()|.
3436 The opposite function is |split()|.
3438 keys({dict}) *keys()*
3439 Return a |List| with all the keys of {dict}. The |List| is in
3440 arbitrary order.
3442 *len()* *E701*
3443 len({expr}) The result is a Number, which is the length of the argument.
3444 When {expr} is a String or a Number the length in bytes is
3445 used, as with |strlen()|.
3446 When {expr} is a |List| the number of items in the |List| is
3447 returned.
3448 When {expr} is a |Dictionary| the number of entries in the
3449 |Dictionary| is returned.
3450 Otherwise an error is given.
3452 *libcall()* *E364* *E368*
3453 libcall({libname}, {funcname}, {argument})
3454 Call function {funcname} in the run-time library {libname}
3455 with single argument {argument}.
3456 This is useful to call functions in a library that you
3457 especially made to be used with Vim. Since only one argument
3458 is possible, calling standard library functions is rather
3459 limited.
3460 The result is the String returned by the function. If the
3461 function returns NULL, this will appear as an empty string ""
3462 to Vim.
3463 If the function returns a number, use libcallnr()!
3464 If {argument} is a number, it is passed to the function as an
3465 int; if {argument} is a string, it is passed as a
3466 null-terminated string.
3467 This function will fail in |restricted-mode|.
3469 libcall() allows you to write your own 'plug-in' extensions to
3470 Vim without having to recompile the program. It is NOT a
3471 means to call system functions! If you try to do so Vim will
3472 very probably crash.
3474 For Win32, the functions you write must be placed in a DLL
3475 and use the normal C calling convention (NOT Pascal which is
3476 used in Windows System DLLs). The function must take exactly
3477 one parameter, either a character pointer or a long integer,
3478 and must return a character pointer or NULL. The character
3479 pointer returned must point to memory that will remain valid
3480 after the function has returned (e.g. in static data in the
3481 DLL). If it points to allocated memory, that memory will
3482 leak away. Using a static buffer in the function should work,
3483 it's then freed when the DLL is unloaded.
3485 WARNING: If the function returns a non-valid pointer, Vim may
3486 crash! This also happens if the function returns a number,
3487 because Vim thinks it's a pointer.
3488 For Win32 systems, {libname} should be the filename of the DLL
3489 without the ".DLL" suffix. A full path is only required if
3490 the DLL is not in the usual places.
3491 For Unix: When compiling your own plugins, remember that the
3492 object code must be compiled as position-independent ('PIC').
3493 {only in Win32 on some Unix versions, when the |+libcall|
3494 feature is present}
3495 Examples: >
3496 :echo libcall("libc.so", "getenv", "HOME")
3497 :echo libcallnr("/usr/lib/libc.so", "getpid", "")
3498 <
3499 *libcallnr()*
3500 libcallnr({libname}, {funcname}, {argument})
3501 Just like libcall(), but used for a function that returns an
3502 int instead of a string.
3503 {only in Win32 on some Unix versions, when the |+libcall|
3504 feature is present}
3505 Example (not very useful...): >
3506 :call libcallnr("libc.so", "printf", "Hello World!\n")
3507 :call libcallnr("libc.so", "sleep", 10)
3508 <
3509 *line()*
3510 line({expr}) The result is a Number, which is the line number of the file
3511 position given with {expr}. The accepted positions are:
3512 . the cursor position
3513 $ the last line in the current buffer
3514 'x position of mark x (if the mark is not set, 0 is
3515 returned)
3516 w0 first line visible in current window
3517 w$ last line visible in current window
3518 v In Visual mode: the start of the Visual area (the
3519 cursor is the end). When not in Visual mode
3520 returns the cursor position. Differs from |'<| in
3521 that it's updated right away.
3522 Note that a mark in another file can be used. The line number
3523 then applies to another buffer.
3524 To get the column number use |col()|. To get both use
3525 |getpos()|.
3526 Examples: >
3527 line(".") line number of the cursor
3528 line("'t") line number of mark t
3529 line("'" . marker) line number of mark marker
3530 < *last-position-jump*
3531 This autocommand jumps to the last known position in a file
3532 just after opening it, if the '" mark is set: >
3533 :au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$") | exe "normal g'\"" | endif
3535 line2byte({lnum}) *line2byte()*
3536 Return the byte count from the start of the buffer for line
3537 {lnum}. This includes the end-of-line character, depending on
3538 the 'fileformat' option for the current buffer. The first
3539 line returns 1.
3540 This can also be used to get the byte count for the line just
3541 below the last line: >
3542 line2byte(line("$") + 1)
3543 < This is the file size plus one.
3544 When {lnum} is invalid, or the |+byte_offset| feature has been
3545 disabled at compile time, -1 is returned.
3546 Also see |byte2line()|, |go| and |:goto|.
3548 lispindent({lnum}) *lispindent()*
3549 Get the amount of indent for line {lnum} according the lisp
3550 indenting rules, as with 'lisp'.
3551 The indent is counted in spaces, the value of 'tabstop' is
3552 relevant. {lnum} is used just like in |getline()|.
3553 When {lnum} is invalid or Vim was not compiled the
3554 |+lispindent| feature, -1 is returned.
3556 localtime() *localtime()*
3557 Return the current time, measured as seconds since 1st Jan
3558 1970. See also |strftime()| and |getftime()|.
3561 map({expr}, {string}) *map()*
3562 {expr} must be a |List| or a |Dictionary|.
3563 Replace each item in {expr} with the result of evaluating
3564 {string}.
3565 Inside {string} |v:val| has the value of the current item.
3566 For a |Dictionary| |v:key| has the key of the current item.
3567 Example: >
3568 :call map(mylist, '"> " . v:val . " <"')
3569 < This puts "> " before and " <" after each item in "mylist".
3571 Note that {string} is the result of an expression and is then
3572 used as an expression again. Often it is good to use a
3573 |literal-string| to avoid having to double backslashes. You
3574 still have to double ' quotes
3576 The operation is done in-place. If you want a |List| or
3577 |Dictionary| to remain unmodified make a copy first: >
3578 :let tlist = map(copy(mylist), ' & . "\t"')
3580 < Returns {expr}, the |List| or |Dictionary| that was filtered.
3581 When an error is encountered while evaluating {string} no
3582 further items in {expr} are processed.
3585 maparg({name}[, {mode} [, {abbr}]]) *maparg()*
3586 Return the rhs of mapping {name} in mode {mode}. When there
3587 is no mapping for {name}, an empty String is returned.
3588 {mode} can be one of these strings:
3589 "n" Normal
3590 "v" Visual
3591 "o" Operator-pending
3592 "i" Insert
3593 "c" Cmd-line
3594 "l" langmap |language-mapping|
3595 "" Normal, Visual and Operator-pending
3596 When {mode} is omitted, the modes for "" are used.
3597 When {abbr} is there and it is non-zero use abbreviations
3598 instead of mappings.
3599 The {name} can have special key names, like in the ":map"
3600 command. The returned String has special characters
3601 translated like in the output of the ":map" command listing.
3602 The mappings local to the current buffer are checked first,
3603 then the global mappings.
3604 This function can be used to map a key even when it's already
3605 mapped, and have it do the original mapping too. Sketch: >
3606 exe 'nnoremap <Tab> ==' . maparg('<Tab>', 'n')
3609 mapcheck({name}[, {mode} [, {abbr}]]) *mapcheck()*
3610 Check if there is a mapping that matches with {name} in mode
3611 {mode}. See |maparg()| for {mode} and special names in
3612 {name}.
3613 When {abbr} is there and it is non-zero use abbreviations
3614 instead of mappings.
3615 A match happens with a mapping that starts with {name} and
3616 with a mapping which is equal to the start of {name}.
3618 matches mapping "a" "ab" "abc" ~
3619 mapcheck("a") yes yes yes
3620 mapcheck("abc") yes yes yes
3621 mapcheck("ax") yes no no
3622 mapcheck("b") no no no
3624 The difference with maparg() is that mapcheck() finds a
3625 mapping that matches with {name}, while maparg() only finds a
3626 mapping for {name} exactly.
3627 When there is no mapping that starts with {name}, an empty
3628 String is returned. If there is one, the rhs of that mapping
3629 is returned. If there are several mappings that start with
3630 {name}, the rhs of one of them is returned.
3631 The mappings local to the current buffer are checked first,
3632 then the global mappings.
3633 This function can be used to check if a mapping can be added
3634 without being ambiguous. Example: >
3635 :if mapcheck("_vv") == ""
3636 : map _vv :set guifont=7x13<CR>
3637 :endif
3638 < This avoids adding the "_vv" mapping when there already is a
3639 mapping for "_v" or for "_vvv".
3641 match({expr}, {pat}[, {start}[, {count}]]) *match()*
3642 When {expr} is a |List| then this returns the index of the
3643 first item where {pat} matches. Each item is used as a
3644 String, |Lists| and |Dictionaries| are used as echoed.
3645 Otherwise, {expr} is used as a String. The result is a
3646 Number, which gives the index (byte offset) in {expr} where
3647 {pat} matches.
3648 A match at the first character or |List| item returns zero.
3649 If there is no match -1 is returned.
3650 Example: >
3651 :echo match("testing", "ing") " results in 4
3652 :echo match([1, 'x'], '\a') " results in 1
3653 < See |string-match| for how {pat} is used.
3654 *strpbrk()*
3655 Vim doesn't have a strpbrk() function. But you can do: >
3656 :let sepidx = match(line, '[.,;: \t]')
3657 < *strcasestr()*
3658 Vim doesn't have a strcasestr() function. But you can add
3659 "\c" to the pattern to ignore case: >
3660 :let idx = match(haystack, '\cneedle')
3661 <
3662 If {start} is given, the search starts from byte index
3663 {start} in a String or item {start} in a |List|.
3664 The result, however, is still the index counted from the
3665 first character/item. Example: >
3666 :echo match("testing", "ing", 2)
3667 < result is again "4". >
3668 :echo match("testing", "ing", 4)
3669 < result is again "4". >
3670 :echo match("testing", "t", 2)
3671 < result is "3".
3672 For a String, if {start} > 0 then it is like the string starts
3673 {start} bytes later, thus "^" will match at {start}. Except
3674 when {count} is given, then it's like matches before the
3675 {start} byte are ignored (this is a bit complicated to keep it
3676 backwards compatible).
3677 For a String, if {start} < 0, it will be set to 0. For a list
3678 the index is counted from the end.
3679 If {start} is out of range ({start} > strlen({expr}) for a
3680 String or {start} > len({expr}) for a |List|) -1 is returned.
3682 When {count} is given use the {count}'th match. When a match
3683 is found in a String the search for the next one starts one
3684 character further. Thus this example results in 1: >
3685 echo match("testing", "..", 0, 2)
3686 < In a |List| the search continues in the next item.
3687 Note that when {count} is added the way {start} works changes,
3688 see above.
3690 See |pattern| for the patterns that are accepted.
3691 The 'ignorecase' option is used to set the ignore-caseness of
3692 the pattern. 'smartcase' is NOT used. The matching is always
3693 done like 'magic' is set and 'cpoptions' is empty.
3695 *matchadd()* *E798* *E799* *E801*
3696 matchadd({group}, {pattern}[, {priority}[, {id}]])
3697 Defines a pattern to be highlighted in the current window (a
3698 "match"). It will be highlighted with {group}. Returns an
3699 identification number (ID), which can be used to delete the
3700 match using |matchdelete()|.
3702 The optional {priority} argument assigns a priority to the
3703 match. A match with a high priority will have its
3704 highlighting overrule that of a match with a lower priority.
3705 A priority is specified as an integer (negative numbers are no
3706 exception). If the {priority} argument is not specified, the
3707 default priority is 10. The priority of 'hlsearch' is zero,
3708 hence all matches with a priority greater than zero will
3709 overrule it. Syntax highlighting (see 'syntax') is a separate
3710 mechanism, and regardless of the chosen priority a match will
3711 always overrule syntax highlighting.
3713 The optional {id} argument allows the request for a specific
3714 match ID. If a specified ID is already taken, an error
3715 message will appear and the match will not be added. An ID
3716 is specified as a positive integer (zero excluded). IDs 1, 2
3717 and 3 are reserved for |:match|, |:2match| and |:3match|,
3718 respectively. If the {id} argument is not specified,
3719 |matchadd()| automatically chooses a free ID.
3721 The number of matches is not limited, as it is the case with
3722 the |:match| commands.
3724 Example: >
3725 :highlight MyGroup ctermbg=green guibg=green
3726 :let m = matchadd("MyGroup", "TODO")
3727 < Deletion of the pattern: >
3728 :call matchdelete(m)
3730 < A list of matches defined by |matchadd()| and |:match| are
3731 available from |getmatches()|. All matches can be deleted in
3732 one operation by |clearmatches()|.
3734 matcharg({nr}) *matcharg()*
3735 Selects the {nr} match item, as set with a |:match|,
3736 |:2match| or |:3match| command.
3737 Return a |List| with two elements:
3738 The name of the highlight group used
3739 The pattern used.
3740 When {nr} is not 1, 2 or 3 returns an empty |List|.
3741 When there is no match item set returns ['', ''].
3742 This is useful to save and restore a |:match|.
3743 Highlighting matches using the |:match| commands are limited
3744 to three matches. |matchadd()| does not have this limitation.
3746 matchdelete({id}) *matchdelete()* *E802* *E803*
3747 Deletes a match with ID {id} previously defined by |matchadd()|
3748 or one of the |:match| commands. Returns 0 if succesfull,
3749 otherwise -1. See example for |matchadd()|. All matches can
3750 be deleted in one operation by |clearmatches()|.
3752 matchend({expr}, {pat}[, {start}[, {count}]]) *matchend()*
3753 Same as match(), but return the index of first character after
3754 the match. Example: >
3755 :echo matchend("testing", "ing")
3756 < results in "7".
3757 *strspn()* *strcspn()*
3758 Vim doesn't have a strspn() or strcspn() function, but you can
3759 do it with matchend(): >
3760 :let span = matchend(line, '[a-zA-Z]')
3761 :let span = matchend(line, '[^a-zA-Z]')
3762 < Except that -1 is returned when there are no matches.
3764 The {start}, if given, has the same meaning as for match(). >
3765 :echo matchend("testing", "ing", 2)
3766 < results in "7". >
3767 :echo matchend("testing", "ing", 5)
3768 < result is "-1".
3769 When {expr} is a |List| the result is equal to match().
3771 matchlist({expr}, {pat}[, {start}[, {count}]]) *matchlist()*
3772 Same as match(), but return a |List|. The first item in the
3773 list is the matched string, same as what matchstr() would
3774 return. Following items are submatches, like "\1", "\2", etc.
3775 in |:substitute|. When an optional submatch didn't match an
3776 empty string is used. Example: >
3777 echo matchlist('acd', '\(a\)\?\(b\)\?\(c\)\?\(.*\)')
3778 < Results in: ['acd', 'a', '', 'c', 'd', '', '', '', '', '']
3779 When there is no match an empty list is returned.
3781 matchstr({expr}, {pat}[, {start}[, {count}]]) *matchstr()*
3782 Same as match(), but return the matched string. Example: >
3783 :echo matchstr("testing", "ing")
3784 < results in "ing".
3785 When there is no match "" is returned.
3786 The {start}, if given, has the same meaning as for match(). >
3787 :echo matchstr("testing", "ing", 2)
3788 < results in "ing". >
3789 :echo matchstr("testing", "ing", 5)
3790 < result is "".
3791 When {expr} is a |List| then the matching item is returned.
3792 The type isn't changed, it's not necessarily a String.
3794 *max()*
3795 max({list}) Return the maximum value of all items in {list}.
3796 If {list} is not a list or one of the items in {list} cannot
3797 be used as a Number this results in an error.
3798 An empty |List| results in zero.
3800 *min()*
3801 min({list}) Return the minimum value of all items in {list}.
3802 If {list} is not a list or one of the items in {list} cannot
3803 be used as a Number this results in an error.
3804 An empty |List| results in zero.
3806 *mkdir()* *E739*
3807 mkdir({name} [, {path} [, {prot}]])
3808 Create directory {name}.
3809 If {path} is "p" then intermediate directories are created as
3810 necessary. Otherwise it must be "".
3811 If {prot} is given it is used to set the protection bits of
3812 the new directory. The default is 0755 (rwxr-xr-x: r/w for
3813 the user readable for others). Use 0700 to make it unreadable
3814 for others.
3815 This function is not available in the |sandbox|.
3816 Not available on all systems. To check use: >
3817 :if exists("*mkdir")
3818 <
3819 *mode()*
3820 mode() Return a string that indicates the current mode:
3821 n Normal
3822 v Visual by character
3823 V Visual by line
3824 CTRL-V Visual blockwise
3825 s Select by character
3826 S Select by line
3827 CTRL-S Select blockwise
3828 i Insert
3829 R Replace
3830 c Command-line
3831 r Hit-enter prompt
3832 This is useful in the 'statusline' option. In most other
3833 places it always returns "c" or "n".
3835 nextnonblank({lnum}) *nextnonblank()*
3836 Return the line number of the first line at or below {lnum}
3837 that is not blank. Example: >
3838 if getline(nextnonblank(1)) =~ "Java"
3839 < When {lnum} is invalid or there is no non-blank line at or
3840 below it, zero is returned.
3841 See also |prevnonblank()|.
3843 nr2char({expr}) *nr2char()*
3844 Return a string with a single character, which has the number
3845 value {expr}. Examples: >
3846 nr2char(64) returns "@"
3847 nr2char(32) returns " "
3848 < The current 'encoding' is used. Example for "utf-8": >
3849 nr2char(300) returns I with bow character
3850 < Note that a NUL character in the file is specified with
3851 nr2char(10), because NULs are represented with newline
3852 characters. nr2char(0) is a real NUL and terminates the
3853 string, thus results in an empty string.
3855 *getpid()*
3856 getpid() Return a Number which is the process ID of the Vim process.
3857 On Unix this is a unique number. On MS-DOS it's always zero.
3859 *getpos()*
3860 getpos({expr}) Get the position for {expr}. For possible values of {expr}
3861 see |line()|.
3862 The result is a |List| with four numbers:
3863 [bufnum, lnum, col, off]
3864 "bufnum" is zero, unless a mark like '0 or 'A is used, then it
3865 is the buffer number of the mark.
3866 "lnum" and "col" are the position in the buffer. The first
3867 column is 1.
3868 The "off" number is zero, unless 'virtualedit' is used. Then
3869 it is the offset in screen columns from the start of the
3870 character. E.g., a position within a <Tab> or after the last
3871 character.
3872 This can be used to save and restore the cursor position: >
3873 let save_cursor = getpos(".")
3874 MoveTheCursorAround
3875 call setpos('.', save_cursor)
3876 < Also see |setpos()|.
3878 pathshorten({expr}) *pathshorten()*
3879 Shorten directory names in the path {expr} and return the
3880 result. The tail, the file name, is kept as-is. The other
3881 components in the path are reduced to single letters. Leading
3882 '~' and '.' characters are kept. Example: >
3883 :echo pathshorten('~/.vim/autoload/myfile.vim')
3884 < ~/.v/a/myfile.vim ~
3885 It doesn't matter if the path exists or not.
3887 prevnonblank({lnum}) *prevnonblank()*
3888 Return the line number of the first line at or above {lnum}
3889 that is not blank. Example: >
3890 let ind = indent(prevnonblank(v:lnum - 1))
3891 < When {lnum} is invalid or there is no non-blank line at or
3892 above it, zero is returned.
3893 Also see |nextnonblank()|.
3896 printf({fmt}, {expr1} ...) *printf()*
3897 Return a String with {fmt}, where "%" items are replaced by
3898 the formatted form of their respective arguments. Example: >
3899 printf("%4d: E%d %.30s", lnum, errno, msg)
3900 < May result in:
3901 " 99: E42 asdfasdfasdfasdfasdfasdfasdfas" ~
3903 Often used items are:
3904 %s string
3905 %6s string right-aligned in 6 bytes
3906 %.9s string truncated to 9 bytes
3907 %c single byte
3908 %d decimal number
3909 %5d decimal number padded with spaces to 5 characters
3910 %x hex number
3911 %04x hex number padded with zeros to at least 4 characters
3912 %X hex number using upper case letters
3913 %o octal number
3914 %% the % character itself
3916 Conversion specifications start with '%' and end with the
3917 conversion type. All other characters are copied unchanged to
3918 the result.
3920 The "%" starts a conversion specification. The following
3921 arguments appear in sequence:
3923 % [flags] [field-width] [.precision] type
3925 flags
3926 Zero or more of the following flags:
3928 # The value should be converted to an "alternate
3929 form". For c, d, and s conversions, this option
3930 has no effect. For o conversions, the precision
3931 of the number is increased to force the first
3932 character of the output string to a zero (except
3933 if a zero value is printed with an explicit
3934 precision of zero).
3935 For x and X conversions, a non-zero result has
3936 the string "0x" (or "0X" for X conversions)
3937 prepended to it.
3939 0 (zero) Zero padding. For all conversions the converted
3940 value is padded on the left with zeros rather
3941 than blanks. If a precision is given with a
3942 numeric conversion (d, o, x, and X), the 0 flag
3943 is ignored.
3945 - A negative field width flag; the converted value
3946 is to be left adjusted on the field boundary.
3947 The converted value is padded on the right with
3948 blanks, rather than on the left with blanks or
3949 zeros. A - overrides a 0 if both are given.
3951 ' ' (space) A blank should be left before a positive
3952 number produced by a signed conversion (d).
3954 + A sign must always be placed before a number
3955 produced by a signed conversion. A + overrides
3956 a space if both are used.
3958 field-width
3959 An optional decimal digit string specifying a minimum
3960 field width. If the converted value has fewer bytes
3961 than the field width, it will be padded with spaces on
3962 the left (or right, if the left-adjustment flag has
3963 been given) to fill out the field width.
3965 .precision
3966 An optional precision, in the form of a period '.'
3967 followed by an optional digit string. If the digit
3968 string is omitted, the precision is taken as zero.
3969 This gives the minimum number of digits to appear for
3970 d, o, x, and X conversions, or the maximum number of
3971 bytes to be printed from a string for s conversions.
3973 type
3974 A character that specifies the type of conversion to
3975 be applied, see below.
3977 A field width or precision, or both, may be indicated by an
3978 asterisk '*' instead of a digit string. In this case, a
3979 Number argument supplies the field width or precision. A
3980 negative field width is treated as a left adjustment flag
3981 followed by a positive field width; a negative precision is
3982 treated as though it were missing. Example: >
3983 :echo printf("%d: %.*s", nr, width, line)
3984 < This limits the length of the text used from "line" to
3985 "width" bytes.
3987 The conversion specifiers and their meanings are:
3989 doxX The Number argument is converted to signed decimal
3990 (d), unsigned octal (o), or unsigned hexadecimal (x
3991 and X) notation. The letters "abcdef" are used for
3992 x conversions; the letters "ABCDEF" are used for X
3993 conversions.
3994 The precision, if any, gives the minimum number of
3995 digits that must appear; if the converted value
3996 requires fewer digits, it is padded on the left with
3997 zeros.
3998 In no case does a non-existent or small field width
3999 cause truncation of a numeric field; if the result of
4000 a conversion is wider than the field width, the field
4001 is expanded to contain the conversion result.
4003 c The Number argument is converted to a byte, and the
4004 resulting character is written.
4006 s The text of the String argument is used. If a
4007 precision is specified, no more bytes than the number
4008 specified are used.
4010 % A '%' is written. No argument is converted. The
4011 complete conversion specification is "%%".
4013 Each argument can be Number or String and is converted
4014 automatically to fit the conversion specifier. Any other
4015 argument type results in an error message.
4017 *E766* *E767*
4018 The number of {exprN} arguments must exactly match the number
4019 of "%" items. If there are not sufficient or too many
4020 arguments an error is given. Up to 18 arguments can be used.
4023 pumvisible() *pumvisible()*
4024 Returns non-zero when the popup menu is visible, zero
4025 otherwise. See |ins-completion-menu|.
4026 This can be used to avoid some things that would remove the
4027 popup menu.
4029 *E726* *E727*
4030 range({expr} [, {max} [, {stride}]]) *range()*
4031 Returns a |List| with Numbers:
4032 - If only {expr} is specified: [0, 1, ..., {expr} - 1]
4033 - If {max} is specified: [{expr}, {expr} + 1, ..., {max}]
4034 - If {stride} is specified: [{expr}, {expr} + {stride}, ...,
4035 {max}] (increasing {expr} with {stride} each time, not
4036 producing a value past {max}).
4037 When the maximum is one before the start the result is an
4038 empty list. When the maximum is more than one before the
4039 start this is an error.
4040 Examples: >
4041 range(4) " [0, 1, 2, 3]
4042 range(2, 4) " [2, 3, 4]
4043 range(2, 9, 3) " [2, 5, 8]
4044 range(2, -2, -1) " [2, 1, 0, -1, -2]
4045 range(0) " []
4046 range(2, 0) " error!
4047 <
4048 *readfile()*
4049 readfile({fname} [, {binary} [, {max}]])
4050 Read file {fname} and return a |List|, each line of the file
4051 as an item. Lines broken at NL characters. Macintosh files
4052 separated with CR will result in a single long line (unless a
4053 NL appears somewhere).
4054 When {binary} is equal to "b" binary mode is used:
4055 - When the last line ends in a NL an extra empty list item is
4056 added.
4057 - No CR characters are removed.
4058 Otherwise:
4059 - CR characters that appear before a NL are removed.
4060 - Whether the last line ends in a NL or not does not matter.
4061 All NUL characters are replaced with a NL character.
4062 When {max} is given this specifies the maximum number of lines
4063 to be read. Useful if you only want to check the first ten
4064 lines of a file: >
4065 :for line in readfile(fname, '', 10)
4066 : if line =~ 'Date' | echo line | endif
4067 :endfor
4068 < When {max} is negative -{max} lines from the end of the file
4069 are returned, or as many as there are.
4070 When {max} is zero the result is an empty list.
4071 Note that without {max} the whole file is read into memory.
4072 Also note that there is no recognition of encoding. Read a
4073 file into a buffer if you need to.
4074 When the file can't be opened an error message is given and
4075 the result is an empty list.
4076 Also see |writefile()|.
4078 reltime([{start} [, {end}]]) *reltime()*
4079 Return an item that represents a time value. The format of
4080 the item depends on the system. It can be passed to
4081 |reltimestr()| to convert it to a string.
4082 Without an argument it returns the current time.
4083 With one argument is returns the time passed since the time
4084 specified in the argument.
4085 With two arguments it returns the time passed between {start}
4086 and {end}.
4087 The {start} and {end} arguments must be values returned by
4088 reltime().
4089 {only available when compiled with the +reltime feature}
4091 reltimestr({time}) *reltimestr()*
4092 Return a String that represents the time value of {time}.
4093 This is the number of seconds, a dot and the number of
4094 microseconds. Example: >
4095 let start = reltime()
4096 call MyFunction()
4097 echo reltimestr(reltime(start))
4098 < Note that overhead for the commands will be added to the time.
4099 The accuracy depends on the system.
4100 Leading spaces are used to make the string align nicely. You
4101 can use split() to remove it. >
4102 echo split(reltimestr(reltime(start)))[0]
4103 < Also see |profiling|.
4104 {only available when compiled with the +reltime feature}
4106 *remote_expr()* *E449*
4107 remote_expr({server}, {string} [, {idvar}])
4108 Send the {string} to {server}. The string is sent as an
4109 expression and the result is returned after evaluation.
4110 The result must be a String or a |List|. A |List| is turned
4111 into a String by joining the items with a line break in
4112 between (not at the end), like with join(expr, "\n").
4113 If {idvar} is present, it is taken as the name of a
4114 variable and a {serverid} for later use with
4115 remote_read() is stored there.
4116 See also |clientserver| |RemoteReply|.
4117 This function is not available in the |sandbox|.
4118 {only available when compiled with the |+clientserver| feature}
4119 Note: Any errors will cause a local error message to be issued
4120 and the result will be the empty string.
4121 Examples: >
4122 :echo remote_expr("gvim", "2+2")
4123 :echo remote_expr("gvim1", "b:current_syntax")
4124 <
4126 remote_foreground({server}) *remote_foreground()*
4127 Move the Vim server with the name {server} to the foreground.
4128 This works like: >
4129 remote_expr({server}, "foreground()")
4130 < Except that on Win32 systems the client does the work, to work
4131 around the problem that the OS doesn't always allow the server
4132 to bring itself to the foreground.
4133 Note: This does not restore the window if it was minimized,
4134 like foreground() does.
4135 This function is not available in the |sandbox|.
4136 {only in the Win32, Athena, Motif and GTK GUI versions and the
4137 Win32 console version}
4140 remote_peek({serverid} [, {retvar}]) *remote_peek()*
4141 Returns a positive number if there are available strings
4142 from {serverid}. Copies any reply string into the variable
4143 {retvar} if specified. {retvar} must be a string with the
4144 name of a variable.
4145 Returns zero if none are available.
4146 Returns -1 if something is wrong.
4147 See also |clientserver|.
4148 This function is not available in the |sandbox|.
4149 {only available when compiled with the |+clientserver| feature}
4150 Examples: >
4151 :let repl = ""
4152 :echo "PEEK: ".remote_peek(id, "repl").": ".repl
4154 remote_read({serverid}) *remote_read()*
4155 Return the oldest available reply from {serverid} and consume
4156 it. It blocks until a reply is available.
4157 See also |clientserver|.
4158 This function is not available in the |sandbox|.
4159 {only available when compiled with the |+clientserver| feature}
4160 Example: >
4161 :echo remote_read(id)
4162 <
4163 *remote_send()* *E241*
4164 remote_send({server}, {string} [, {idvar}])
4165 Send the {string} to {server}. The string is sent as input
4166 keys and the function returns immediately. At the Vim server
4167 the keys are not mapped |:map|.
4168 If {idvar} is present, it is taken as the name of a variable
4169 and a {serverid} for later use with remote_read() is stored
4170 there.
4171 See also |clientserver| |RemoteReply|.
4172 This function is not available in the |sandbox|.
4173 {only available when compiled with the |+clientserver| feature}
4174 Note: Any errors will be reported in the server and may mess
4175 up the display.
4176 Examples: >
4177 :echo remote_send("gvim", ":DropAndReply ".file, "serverid").
4178 \ remote_read(serverid)
4180 :autocmd NONE RemoteReply *
4181 \ echo remote_read(expand("<amatch>"))
4182 :echo remote_send("gvim", ":sleep 10 | echo ".
4183 \ 'server2client(expand("<client>"), "HELLO")<CR>')
4184 <
4185 remove({list}, {idx} [, {end}]) *remove()*
4186 Without {end}: Remove the item at {idx} from |List| {list} and
4187 return it.
4188 With {end}: Remove items from {idx} to {end} (inclusive) and
4189 return a list with these items. When {idx} points to the same
4190 item as {end} a list with one item is returned. When {end}
4191 points to an item before {idx} this is an error.
4192 See |list-index| for possible values of {idx} and {end}.
4193 Example: >
4194 :echo "last item: " . remove(mylist, -1)
4195 :call remove(mylist, 0, 9)
4196 remove({dict}, {key})
4197 Remove the entry from {dict} with key {key}. Example: >
4198 :echo "removed " . remove(dict, "one")
4199 < If there is no {key} in {dict} this is an error.
4201 Use |delete()| to remove a file.
4203 rename({from}, {to}) *rename()*
4204 Rename the file by the name {from} to the name {to}. This
4205 should also work to move files across file systems. The
4206 result is a Number, which is 0 if the file was renamed
4207 successfully, and non-zero when the renaming failed.
4208 This function is not available in the |sandbox|.
4210 repeat({expr}, {count}) *repeat()*
4211 Repeat {expr} {count} times and return the concatenated
4212 result. Example: >
4213 :let separator = repeat('-', 80)
4214 < When {count} is zero or negative the result is empty.
4215 When {expr} is a |List| the result is {expr} concatenated
4216 {count} times. Example: >
4217 :let longlist = repeat(['a', 'b'], 3)
4218 < Results in ['a', 'b', 'a', 'b', 'a', 'b'].
4221 resolve({filename}) *resolve()* *E655*
4222 On MS-Windows, when {filename} is a shortcut (a .lnk file),
4223 returns the path the shortcut points to in a simplified form.
4224 On Unix, repeat resolving symbolic links in all path
4225 components of {filename} and return the simplified result.
4226 To cope with link cycles, resolving of symbolic links is
4227 stopped after 100 iterations.
4228 On other systems, return the simplified {filename}.
4229 The simplification step is done as by |simplify()|.
4230 resolve() keeps a leading path component specifying the
4231 current directory (provided the result is still a relative
4232 path name) and also keeps a trailing path separator.
4234 *reverse()*
4235 reverse({list}) Reverse the order of items in {list} in-place. Returns
4236 {list}.
4237 If you want a list to remain unmodified make a copy first: >
4238 :let revlist = reverse(copy(mylist))
4240 search({pattern} [, {flags} [, {stopline} [, {timeout}]]]) *search()*
4241 Search for regexp pattern {pattern}. The search starts at the
4242 cursor position (you can use |cursor()| to set it).
4244 {flags} is a String, which can contain these character flags:
4245 'b' search backward instead of forward
4246 'c' accept a match at the cursor position
4247 'e' move to the End of the match
4248 'n' do Not move the cursor
4249 'p' return number of matching sub-pattern (see below)
4250 's' set the ' mark at the previous location of the cursor
4251 'w' wrap around the end of the file
4252 'W' don't wrap around the end of the file
4253 If neither 'w' or 'W' is given, the 'wrapscan' option applies.
4255 If the 's' flag is supplied, the ' mark is set, only if the
4256 cursor is moved. The 's' flag cannot be combined with the 'n'
4257 flag.
4259 'ignorecase', 'smartcase' and 'magic' are used.
4261 When the {stopline} argument is given then the search stops
4262 after searching this line. This is useful to restrict the
4263 search to a range of lines. Examples: >
4264 let match = search('(', 'b', line("w0"))
4265 let end = search('END', '', line("w$"))
4266 < When {stopline} is used and it is not zero this also implies
4267 that the search does not wrap around the end of the file.
4268 A zero value is equal to not giving the argument.
4270 When the {timeout} argument is given the search stops when
4271 more than this many milli seconds have passed. Thus when
4272 {timeout} is 500 the search stops after half a second.
4273 The value must not be negative. A zero value is like not
4274 giving the argument.
4275 {only available when compiled with the +reltime feature}
4277 If there is no match a 0 is returned and the cursor doesn't
4278 move. No error message is given.
4279 When a match has been found its line number is returned.
4280 *search()-sub-match*
4281 With the 'p' flag the returned value is one more than the
4282 first sub-match in \(\). One if none of them matched but the
4283 whole pattern did match.
4284 To get the column number too use |searchpos()|.
4286 The cursor will be positioned at the match, unless the 'n'
4287 flag is used.
4289 Example (goes over all files in the argument list): >
4290 :let n = 1
4291 :while n <= argc() " loop over all files in arglist
4292 : exe "argument " . n
4293 : " start at the last char in the file and wrap for the
4294 : " first search to find match at start of file
4295 : normal G$
4296 : let flags = "w"
4297 : while search("foo", flags) > 0
4298 : s/foo/bar/g
4299 : let flags = "W"
4300 : endwhile
4301 : update " write the file if modified
4302 : let n = n + 1
4303 :endwhile
4304 <
4305 Example for using some flags: >
4306 :echo search('\<if\|\(else\)\|\(endif\)', 'ncpe')
4307 < This will search for the keywords "if", "else", and "endif"
4308 under or after the cursor. Because of the 'p' flag, it
4309 returns 1, 2, or 3 depending on which keyword is found, or 0
4310 if the search fails. With the cursor on the first word of the
4311 line:
4312 if (foo == 0) | let foo = foo + 1 | endif ~
4313 the function returns 1. Without the 'c' flag, the function
4314 finds the "endif" and returns 3. The same thing happens
4315 without the 'e' flag if the cursor is on the "f" of "if".
4316 The 'n' flag tells the function not to move the cursor.
4319 searchdecl({name} [, {global} [, {thisblock}]]) *searchdecl()*
4320 Search for the declaration of {name}.
4322 With a non-zero {global} argument it works like |gD|, find
4323 first match in the file. Otherwise it works like |gd|, find
4324 first match in the function.
4326 With a non-zero {thisblock} argument matches in a {} block
4327 that ends before the cursor position are ignored. Avoids
4328 finding variable declarations only valid in another scope.
4330 Moves the cursor to the found match.
4331 Returns zero for success, non-zero for failure.
4332 Example: >
4333 if searchdecl('myvar') == 0
4334 echo getline('.')
4335 endif
4336 <
4337 *searchpair()*
4338 searchpair({start}, {middle}, {end} [, {flags} [, {skip}
4339 [, {stopline} [, {timeout}]]]])
4340 Search for the match of a nested start-end pair. This can be
4341 used to find the "endif" that matches an "if", while other
4342 if/endif pairs in between are ignored.
4343 The search starts at the cursor. The default is to search
4344 forward, include 'b' in {flags} to search backward.
4345 If a match is found, the cursor is positioned at it and the
4346 line number is returned. If no match is found 0 or -1 is
4347 returned and the cursor doesn't move. No error message is
4348 given.
4350 {start}, {middle} and {end} are patterns, see |pattern|. They
4351 must not contain \( \) pairs. Use of \%( \) is allowed. When
4352 {middle} is not empty, it is found when searching from either
4353 direction, but only when not in a nested start-end pair. A
4354 typical use is: >
4355 searchpair('\<if\>', '\<else\>', '\<endif\>')
4356 < By leaving {middle} empty the "else" is skipped.
4358 {flags} 'b', 'c', 'n', 's', 'w' and 'W' are used like with
4359 |search()|. Additionally:
4360 'r' Repeat until no more matches found; will find the
4361 outer pair
4362 'm' return number of Matches instead of line number with
4363 the match; will be > 1 when 'r' is used.
4365 When a match for {start}, {middle} or {end} is found, the
4366 {skip} expression is evaluated with the cursor positioned on
4367 the start of the match. It should return non-zero if this
4368 match is to be skipped. E.g., because it is inside a comment
4369 or a string.
4370 When {skip} is omitted or empty, every match is accepted.
4371 When evaluating {skip} causes an error the search is aborted
4372 and -1 returned.
4374 For {stopline} and {timeout} see |search()|.
4376 The value of 'ignorecase' is used. 'magic' is ignored, the
4377 patterns are used like it's on.
4379 The search starts exactly at the cursor. A match with
4380 {start}, {middle} or {end} at the next character, in the
4381 direction of searching, is the first one found. Example: >
4382 if 1
4383 if 2
4384 endif 2
4385 endif 1
4386 < When starting at the "if 2", with the cursor on the "i", and
4387 searching forwards, the "endif 2" is found. When starting on
4388 the character just before the "if 2", the "endif 1" will be
4389 found. That's because the "if 2" will be found first, and
4390 then this is considered to be a nested if/endif from "if 2" to
4391 "endif 2".
4392 When searching backwards and {end} is more than one character,
4393 it may be useful to put "\zs" at the end of the pattern, so
4394 that when the cursor is inside a match with the end it finds
4395 the matching start.
4397 Example, to find the "endif" command in a Vim script: >
4399 :echo searchpair('\<if\>', '\<el\%[seif]\>', '\<en\%[dif]\>', 'W',
4400 \ 'getline(".") =~ "^\\s*\""')
4402 < The cursor must be at or after the "if" for which a match is
4403 to be found. Note that single-quote strings are used to avoid
4404 having to double the backslashes. The skip expression only
4405 catches comments at the start of a line, not after a command.
4406 Also, a word "en" or "if" halfway a line is considered a
4407 match.
4408 Another example, to search for the matching "{" of a "}": >
4410 :echo searchpair('{', '', '}', 'bW')
4412 < This works when the cursor is at or before the "}" for which a
4413 match is to be found. To reject matches that syntax
4414 highlighting recognized as strings: >
4416 :echo searchpair('{', '', '}', 'bW',
4417 \ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"')
4418 <
4419 *searchpairpos()*
4420 searchpairpos({start}, {middle}, {end} [, {flags} [, {skip}
4421 [, {stopline} [, {timeout}]]]])
4422 Same as searchpair(), but returns a |List| with the line and
4423 column position of the match. The first element of the |List|
4424 is the line number and the second element is the byte index of
4425 the column position of the match. If no match is found,
4426 returns [0, 0].
4427 >
4428 :let [lnum,col] = searchpairpos('{', '', '}', 'n')
4429 <
4430 See |match-parens| for a bigger and more useful example.
4432 searchpos({pattern} [, {flags} [, {stopline} [, {timeout}]]]) *searchpos()*
4433 Same as |search()|, but returns a |List| with the line and
4434 column position of the match. The first element of the |List|
4435 is the line number and the second element is the byte index of
4436 the column position of the match. If no match is found,
4437 returns [0, 0].
4438 Example: >
4439 :let [lnum, col] = searchpos('mypattern', 'n')
4441 < When the 'p' flag is given then there is an extra item with
4442 the sub-pattern match number |search()-sub-match|. Example: >
4443 :let [lnum, col, submatch] = searchpos('\(\l\)\|\(\u\)', 'np')
4444 < In this example "submatch" is 2 when a lowercase letter is
4445 found |/\l|, 3 when an uppercase letter is found |/\u|.
4447 server2client( {clientid}, {string}) *server2client()*
4448 Send a reply string to {clientid}. The most recent {clientid}
4449 that sent a string can be retrieved with expand("<client>").
4450 {only available when compiled with the |+clientserver| feature}
4451 Note:
4452 This id has to be stored before the next command can be
4453 received. I.e. before returning from the received command and
4454 before calling any commands that waits for input.
4455 See also |clientserver|.
4456 Example: >
4457 :echo server2client(expand("<client>"), "HELLO")
4458 <
4459 serverlist() *serverlist()*
4460 Return a list of available server names, one per line.
4461 When there are no servers or the information is not available
4462 an empty string is returned. See also |clientserver|.
4463 {only available when compiled with the |+clientserver| feature}
4464 Example: >
4465 :echo serverlist()
4466 <
4467 setbufvar({expr}, {varname}, {val}) *setbufvar()*
4468 Set option or local variable {varname} in buffer {expr} to
4469 {val}.
4470 This also works for a global or local window option, but it
4471 doesn't work for a global or local window variable.
4472 For a local window option the global value is unchanged.
4473 For the use of {expr}, see |bufname()| above.
4474 Note that the variable name without "b:" must be used.
4475 Examples: >
4476 :call setbufvar(1, "&mod", 1)
4477 :call setbufvar("todo", "myvar", "foobar")
4478 < This function is not available in the |sandbox|.
4480 setcmdpos({pos}) *setcmdpos()*
4481 Set the cursor position in the command line to byte position
4482 {pos}. The first position is 1.
4483 Use |getcmdpos()| to obtain the current position.
4484 Only works while editing the command line, thus you must use
4485 |c_CTRL-\_e|, |c_CTRL-R_=| or |c_CTRL-R_CTRL-R| with '='. For
4486 |c_CTRL-\_e| and |c_CTRL-R_CTRL-R| with '=' the position is
4487 set after the command line is set to the expression. For
4488 |c_CTRL-R_=| it is set after evaluating the expression but
4489 before inserting the resulting text.
4490 When the number is too big the cursor is put at the end of the
4491 line. A number smaller than one has undefined results.
4492 Returns 0 when successful, 1 when not editing the command
4493 line.
4495 setline({lnum}, {line}) *setline()*
4496 Set line {lnum} of the current buffer to {line}.
4497 {lnum} is used like with |getline()|.
4498 When {lnum} is just below the last line the {line} will be
4499 added as a new line.
4500 If this succeeds, 0 is returned. If this fails (most likely
4501 because {lnum} is invalid) 1 is returned. Example: >
4502 :call setline(5, strftime("%c"))
4503 < When {line} is a |List| then line {lnum} and following lines
4504 will be set to the items in the list. Example: >
4505 :call setline(5, ['aaa', 'bbb', 'ccc'])
4506 < This is equivalent to: >
4507 :for [n, l] in [[5, 6, 7], ['aaa', 'bbb', 'ccc']]
4508 : call setline(n, l)
4509 :endfor
4510 < Note: The '[ and '] marks are not set.
4512 setloclist({nr}, {list} [, {action}]) *setloclist()*
4513 Create or replace or add to the location list for window {nr}.
4514 When {nr} is zero the current window is used. For a location
4515 list window, the displayed location list is modified. For an
4516 invalid window number {nr}, -1 is returned.
4517 Otherwise, same as |setqflist()|.
4518 Also see |location-list|.
4520 setmatches({list}) *setmatches()*
4521 Restores a list of matches saved by |getmatches()|. Returns 0
4522 if succesfull, otherwise -1. All current matches are cleared
4523 before the list is restored. See example for |getmatches()|.
4525 *setpos()*
4526 setpos({expr}, {list})
4527 Set the position for {expr}. Possible values:
4528 . the cursor
4529 'x mark x
4531 {list} must be a |List| with four numbers:
4532 [bufnum, lnum, col, off]
4534 "bufnum" is the buffer number. Zero can be used for the
4535 current buffer. Setting the cursor is only possible for
4536 the current buffer. To set a mark in another buffer you can
4537 use the |bufnr()| function to turn a file name into a buffer
4538 number.
4539 Does not change the jumplist.
4541 "lnum" and "col" are the position in the buffer. The first
4542 column is 1. Use a zero "lnum" to delete a mark.
4544 The "off" number is only used when 'virtualedit' is set. Then
4545 it is the offset in screen columns from the start of the
4546 character. E.g., a position within a <Tab> or after the last
4547 character.
4549 Returns 0 when the position could be set, -1 otherwise.
4550 An error message is given if {expr} is invalid.
4552 Also see |getpos()|
4554 This does not restore the preferred column for moving
4555 vertically. See |winrestview()| for that.
4558 setqflist({list} [, {action}]) *setqflist()*
4559 Create or replace or add to the quickfix list using the items
4560 in {list}. Each item in {list} is a dictionary.
4561 Non-dictionary items in {list} are ignored. Each dictionary
4562 item can contain the following entries:
4564 bufnr buffer number; must be the number of a valid
4565 buffer
4566 filename name of a file; only used when "bufnr" is not
4567 present or it is invalid.
4568 lnum line number in the file
4569 pattern search pattern used to locate the error
4570 col column number
4571 vcol when non-zero: "col" is visual column
4572 when zero: "col" is byte index
4573 nr error number
4574 text description of the error
4575 type single-character error type, 'E', 'W', etc.
4577 The "col", "vcol", "nr", "type" and "text" entries are
4578 optional. Either "lnum" or "pattern" entry can be used to
4579 locate a matching error line.
4580 If the "filename" and "bufnr" entries are not present or
4581 neither the "lnum" or "pattern" entries are present, then the
4582 item will not be handled as an error line.
4583 If both "pattern" and "lnum" are present then "pattern" will
4584 be used.
4585 Note that the list is not exactly the same as what
4586 |getqflist()| returns.
4588 If {action} is set to 'a', then the items from {list} are
4589 added to the existing quickfix list. If there is no existing
4590 list, then a new list is created. If {action} is set to 'r',
4591 then the items from the current quickfix list are replaced
4592 with the items from {list}. If {action} is not present or is
4593 set to ' ', then a new list is created.
4595 Returns zero for success, -1 for failure.
4597 This function can be used to create a quickfix list
4598 independent of the 'errorformat' setting. Use a command like
4599 ":cc 1" to jump to the first position.
4602 *setreg()*
4603 setreg({regname}, {value} [,{options}])
4604 Set the register {regname} to {value}.
4605 If {options} contains "a" or {regname} is upper case,
4606 then the value is appended.
4607 {options} can also contains a register type specification:
4608 "c" or "v" |characterwise| mode
4609 "l" or "V" |linewise| mode
4610 "b" or "<CTRL-V>" |blockwise-visual| mode
4611 If a number immediately follows "b" or "<CTRL-V>" then this is
4612 used as the width of the selection - if it is not specified
4613 then the width of the block is set to the number of characters
4614 in the longest line (counting a <Tab> as 1 character).
4616 If {options} contains no register settings, then the default
4617 is to use character mode unless {value} ends in a <NL>.
4618 Setting the '=' register is not possible.
4619 Returns zero for success, non-zero for failure.
4621 Examples: >
4622 :call setreg(v:register, @*)
4623 :call setreg('*', @%, 'ac')
4624 :call setreg('a', "1\n2\n3", 'b5')
4626 < This example shows using the functions to save and restore a
4627 register. >
4628 :let var_a = getreg('a', 1)
4629 :let var_amode = getregtype('a')
4630 ....
4631 :call setreg('a', var_a, var_amode)
4633 < You can also change the type of a register by appending
4634 nothing: >
4635 :call setreg('a', '', 'al')
4637 settabwinvar({tabnr}, {winnr}, {varname}, {val}) *settabwinvar()*
4638 Set option or local variable {varname} in window {winnr} to
4639 {val}.
4640 Tabs are numbered starting with one. For the current tabpage
4641 use |setwinvar()|.
4642 When {winnr} is zero the current window is used.
4643 This also works for a global or local buffer option, but it
4644 doesn't work for a global or local buffer variable.
4645 For a local buffer option the global value is unchanged.
4646 Note that the variable name without "w:" must be used.
4647 Vim briefly goes to the tab page {tabnr}, this may trigger
4648 TabLeave and TabEnter autocommands.
4649 Examples: >
4650 :call settabwinvar(1, 1, "&list", 0)
4651 :call settabwinvar(3, 2, "myvar", "foobar")
4652 < This function is not available in the |sandbox|.
4654 setwinvar({nr}, {varname}, {val}) *setwinvar()*
4655 Like |settabwinvar()| for the current tab page.
4656 Examples: >
4657 :call setwinvar(1, "&list", 0)
4658 :call setwinvar(2, "myvar", "foobar")
4660 shellescape({string}) *shellescape()*
4661 Escape {string} for use as shell command argument.
4662 On MS-Windows and MS-DOS, when 'shellslash' is not set, it
4663 will enclose {string} double quotes and double all double
4664 quotes within {string}.
4665 For other systems, it will enclose {string} in single quotes
4666 and replace all "'" with "'\''".
4667 Example: >
4668 :echo shellescape('c:\program files\vim')
4669 < results in:
4670 "c:\program files\vim" ~
4671 Example usage: >
4672 :call system("chmod +x -- " . shellescape(expand("%")))
4675 simplify({filename}) *simplify()*
4676 Simplify the file name as much as possible without changing
4677 the meaning. Shortcuts (on MS-Windows) or symbolic links (on
4678 Unix) are not resolved. If the first path component in
4679 {filename} designates the current directory, this will be
4680 valid for the result as well. A trailing path separator is
4681 not removed either.
4682 Example: >
4683 simplify("./dir/.././/file/") == "./file/"
4684 < Note: The combination "dir/.." is only removed if "dir" is
4685 a searchable directory or does not exist. On Unix, it is also
4686 removed when "dir" is a symbolic link within the same
4687 directory. In order to resolve all the involved symbolic
4688 links before simplifying the path name, use |resolve()|.
4691 sort({list} [, {func}]) *sort()* *E702*
4692 Sort the items in {list} in-place. Returns {list}. If you
4693 want a list to remain unmodified make a copy first: >
4694 :let sortedlist = sort(copy(mylist))
4695 < Uses the string representation of each item to sort on.
4696 Numbers sort after Strings, |Lists| after Numbers.
4697 For sorting text in the current buffer use |:sort|.
4698 When {func} is given and it is one then case is ignored.
4699 When {func} is a |Funcref| or a function name, this function
4700 is called to compare items. The function is invoked with two
4701 items as argument and must return zero if they are equal, 1 if
4702 the first one sorts after the second one, -1 if the first one
4703 sorts before the second one. Example: >
4704 func MyCompare(i1, i2)
4705 return a:i1 == a:i2 ? 0 : a:i1 > a:i2 ? 1 : -1
4706 endfunc
4707 let sortedlist = sort(mylist, "MyCompare")
4708 <
4710 *soundfold()*
4711 soundfold({word})
4712 Return the sound-folded equivalent of {word}. Uses the first
4713 language in 'spellang' for the current window that supports
4714 soundfolding. 'spell' must be set. When no sound folding is
4715 possible the {word} is returned unmodified.
4716 This can be used for making spelling suggestions. Note that
4717 the method can be quite slow.
4719 *spellbadword()*
4720 spellbadword([{sentence}])
4721 Without argument: The result is the badly spelled word under
4722 or after the cursor. The cursor is moved to the start of the
4723 bad word. When no bad word is found in the cursor line the
4724 result is an empty string and the cursor doesn't move.
4726 With argument: The result is the first word in {sentence} that
4727 is badly spelled. If there are no spelling mistakes the
4728 result is an empty string.
4730 The return value is a list with two items:
4731 - The badly spelled word or an empty string.
4732 - The type of the spelling error:
4733 "bad" spelling mistake
4734 "rare" rare word
4735 "local" word only valid in another region
4736 "caps" word should start with Capital
4737 Example: >
4738 echo spellbadword("the quik brown fox")
4739 < ['quik', 'bad'] ~
4741 The spelling information for the current window is used. The
4742 'spell' option must be set and the value of 'spelllang' is
4743 used.
4745 *spellsuggest()*
4746 spellsuggest({word} [, {max} [, {capital}]])
4747 Return a |List| with spelling suggestions to replace {word}.
4748 When {max} is given up to this number of suggestions are
4749 returned. Otherwise up to 25 suggestions are returned.
4751 When the {capital} argument is given and it's non-zero only
4752 suggestions with a leading capital will be given. Use this
4753 after a match with 'spellcapcheck'.
4755 {word} can be a badly spelled word followed by other text.
4756 This allows for joining two words that were split. The
4757 suggestions also include the following text, thus you can
4758 replace a line.
4760 {word} may also be a good word. Similar words will then be
4761 returned. {word} itself is not included in the suggestions,
4762 although it may appear capitalized.
4764 The spelling information for the current window is used. The
4765 'spell' option must be set and the values of 'spelllang' and
4766 'spellsuggest' are used.
4769 split({expr} [, {pattern} [, {keepempty}]]) *split()*
4770 Make a |List| out of {expr}. When {pattern} is omitted or
4771 empty each white-separated sequence of characters becomes an
4772 item.
4773 Otherwise the string is split where {pattern} matches,
4774 removing the matched characters.
4775 When the first or last item is empty it is omitted, unless the
4776 {keepempty} argument is given and it's non-zero.
4777 Other empty items are kept when {pattern} matches at least one
4778 character or when {keepempty} is non-zero.
4779 Example: >
4780 :let words = split(getline('.'), '\W\+')
4781 < To split a string in individual characters: >
4782 :for c in split(mystring, '\zs')
4783 < If you want to keep the separator you can also use '\zs': >
4784 :echo split('abc:def:ghi', ':\zs')
4785 < ['abc:', 'def:', 'ghi'] ~
4786 Splitting a table where the first element can be empty: >
4787 :let items = split(line, ':', 1)
4788 < The opposite function is |join()|.
4791 str2nr( {expr} [, {base}]) *str2nr()*
4792 Convert string {expr} to a number.
4793 {base} is the conversion base, it can be 8, 10 or 16.
4794 When {base} is omitted base 10 is used. This also means that
4795 a leading zero doesn't cause octal conversion to be used, as
4796 with the default String to Number conversion.
4797 When {base} is 16 a leading "0x" or "0X" is ignored. With a
4798 different base the result will be zero.
4799 Text after the number is silently ignored.
4802 strftime({format} [, {time}]) *strftime()*
4803 The result is a String, which is a formatted date and time, as
4804 specified by the {format} string. The given {time} is used,
4805 or the current time if no time is given. The accepted
4806 {format} depends on your system, thus this is not portable!
4807 See the manual page of the C function strftime() for the
4808 format. The maximum length of the result is 80 characters.
4809 See also |localtime()| and |getftime()|.
4810 The language can be changed with the |:language| command.
4811 Examples: >
4812 :echo strftime("%c") Sun Apr 27 11:49:23 1997
4813 :echo strftime("%Y %b %d %X") 1997 Apr 27 11:53:25
4814 :echo strftime("%y%m%d %T") 970427 11:53:55
4815 :echo strftime("%H:%M") 11:55
4816 :echo strftime("%c", getftime("file.c"))
4817 Show mod time of file.c.
4818 < Not available on all systems. To check use: >
4819 :if exists("*strftime")
4821 stridx({haystack}, {needle} [, {start}]) *stridx()*
4822 The result is a Number, which gives the byte index in
4823 {haystack} of the first occurrence of the String {needle}.
4824 If {start} is specified, the search starts at index {start}.
4825 This can be used to find a second match: >
4826 :let comma1 = stridx(line, ",")
4827 :let comma2 = stridx(line, ",", comma1 + 1)
4828 < The search is done case-sensitive.
4829 For pattern searches use |match()|.
4830 -1 is returned if the {needle} does not occur in {haystack}.
4831 See also |strridx()|.
4832 Examples: >
4833 :echo stridx("An Example", "Example") 3
4834 :echo stridx("Starting point", "Start") 0
4835 :echo stridx("Starting point", "start") -1
4836 < *strstr()* *strchr()*
4837 stridx() works similar to the C function strstr(). When used
4838 with a single character it works similar to strchr().
4840 *string()*
4841 string({expr}) Return {expr} converted to a String. If {expr} is a Number,
4842 String or a composition of them, then the result can be parsed
4843 back with |eval()|.
4844 {expr} type result ~
4845 String 'string'
4846 Number 123
4847 Funcref function('name')
4848 List [item, item]
4849 Dictionary {key: value, key: value}
4850 Note that in String values the ' character is doubled.
4851 Also see |strtrans()|.
4853 *strlen()*
4854 strlen({expr}) The result is a Number, which is the length of the String
4855 {expr} in bytes.
4856 If you want to count the number of multi-byte characters (not
4857 counting composing characters) use something like this: >
4859 :let len = strlen(substitute(str, ".", "x", "g"))
4860 <
4861 If the argument is a Number it is first converted to a String.
4862 For other types an error is given.
4863 Also see |len()|.
4865 strpart({src}, {start}[, {len}]) *strpart()*
4866 The result is a String, which is part of {src}, starting from
4867 byte {start}, with the byte length {len}.
4868 When non-existing bytes are included, this doesn't result in
4869 an error, the bytes are simply omitted.
4870 If {len} is missing, the copy continues from {start} till the
4871 end of the {src}. >
4872 strpart("abcdefg", 3, 2) == "de"
4873 strpart("abcdefg", -2, 4) == "ab"
4874 strpart("abcdefg", 5, 4) == "fg"
4875 strpart("abcdefg", 3) == "defg"
4876 < Note: To get the first character, {start} must be 0. For
4877 example, to get three bytes under and after the cursor: >
4878 strpart(getline("."), col(".") - 1, 3)
4879 <
4880 strridx({haystack}, {needle} [, {start}]) *strridx()*
4881 The result is a Number, which gives the byte index in
4882 {haystack} of the last occurrence of the String {needle}.
4883 When {start} is specified, matches beyond this index are
4884 ignored. This can be used to find a match before a previous
4885 match: >
4886 :let lastcomma = strridx(line, ",")
4887 :let comma2 = strridx(line, ",", lastcomma - 1)
4888 < The search is done case-sensitive.
4889 For pattern searches use |match()|.
4890 -1 is returned if the {needle} does not occur in {haystack}.
4891 If the {needle} is empty the length of {haystack} is returned.
4892 See also |stridx()|. Examples: >
4893 :echo strridx("an angry armadillo", "an") 3
4894 < *strrchr()*
4895 When used with a single character it works similar to the C
4896 function strrchr().
4898 strtrans({expr}) *strtrans()*
4899 The result is a String, which is {expr} with all unprintable
4900 characters translated into printable characters |'isprint'|.
4901 Like they are shown in a window. Example: >
4902 echo strtrans(@a)
4903 < This displays a newline in register a as "^@" instead of
4904 starting a new line.
4906 submatch({nr}) *submatch()*
4907 Only for an expression in a |:substitute| command. Returns
4908 the {nr}'th submatch of the matched text. When {nr} is 0
4909 the whole matched text is returned.
4910 Example: >
4911 :s/\d\+/\=submatch(0) + 1/
4912 < This finds the first number in the line and adds one to it.
4913 A line break is included as a newline character.
4915 substitute({expr}, {pat}, {sub}, {flags}) *substitute()*
4916 The result is a String, which is a copy of {expr}, in which
4917 the first match of {pat} is replaced with {sub}. This works
4918 like the ":substitute" command (without any flags). But the
4919 matching with {pat} is always done like the 'magic' option is
4920 set and 'cpoptions' is empty (to make scripts portable).
4921 'ignorecase' is still relevant. 'smartcase' is not used.
4922 See |string-match| for how {pat} is used.
4923 And a "~" in {sub} is not replaced with the previous {sub}.
4924 Note that some codes in {sub} have a special meaning
4925 |sub-replace-special|. For example, to replace something with
4926 "\n" (two characters), use "\\\\n" or '\\n'.
4927 When {pat} does not match in {expr}, {expr} is returned
4928 unmodified.
4929 When {flags} is "g", all matches of {pat} in {expr} are
4930 replaced. Otherwise {flags} should be "".
4931 Example: >
4932 :let &path = substitute(&path, ",\\=[^,]*$", "", "")
4933 < This removes the last component of the 'path' option. >
4934 :echo substitute("testing", ".*", "\\U\\0", "")
4935 < results in "TESTING".
4937 synID({lnum}, {col}, {trans}) *synID()*
4938 The result is a Number, which is the syntax ID at the position
4939 {lnum} and {col} in the current window.
4940 The syntax ID can be used with |synIDattr()| and
4941 |synIDtrans()| to obtain syntax information about text.
4943 {col} is 1 for the leftmost column, {lnum} is 1 for the first
4944 line. 'synmaxcol' applies, in a longer line zero is returned.
4946 When {trans} is non-zero, transparent items are reduced to the
4947 item that they reveal. This is useful when wanting to know
4948 the effective color. When {trans} is zero, the transparent
4949 item is returned. This is useful when wanting to know which
4950 syntax item is effective (e.g. inside parens).
4951 Warning: This function can be very slow. Best speed is
4952 obtained by going through the file in forward direction.
4954 Example (echoes the name of the syntax item under the cursor): >
4955 :echo synIDattr(synID(line("."), col("."), 1), "name")
4956 <
4957 synIDattr({synID}, {what} [, {mode}]) *synIDattr()*
4958 The result is a String, which is the {what} attribute of
4959 syntax ID {synID}. This can be used to obtain information
4960 about a syntax item.
4961 {mode} can be "gui", "cterm" or "term", to get the attributes
4962 for that mode. When {mode} is omitted, or an invalid value is
4963 used, the attributes for the currently active highlighting are
4964 used (GUI, cterm or term).
4965 Use synIDtrans() to follow linked highlight groups.
4966 {what} result
4967 "name" the name of the syntax item
4968 "fg" foreground color (GUI: color name used to set
4969 the color, cterm: color number as a string,
4970 term: empty string)
4971 "bg" background color (like "fg")
4972 "fg#" like "fg", but for the GUI and the GUI is
4973 running the name in "#RRGGBB" form
4974 "bg#" like "fg#" for "bg"
4975 "bold" "1" if bold
4976 "italic" "1" if italic
4977 "reverse" "1" if reverse
4978 "inverse" "1" if inverse (= reverse)
4979 "underline" "1" if underlined
4980 "undercurl" "1" if undercurled
4982 Example (echoes the color of the syntax item under the
4983 cursor): >
4984 :echo synIDattr(synIDtrans(synID(line("."), col("."), 1)), "fg")
4985 <
4986 synIDtrans({synID}) *synIDtrans()*
4987 The result is a Number, which is the translated syntax ID of
4988 {synID}. This is the syntax group ID of what is being used to
4989 highlight the character. Highlight links given with
4990 ":highlight link" are followed.
4992 synstack({lnum}, {col}) *synstack()*
4993 Return a |List|, which is the stack of syntax items at the
4994 position {lnum} and {col} in the current window. Each item in
4995 the List is an ID like what |synID()| returns.
4996 The first item in the List is the outer region, following are
4997 items contained in that one. The last one is what |synID()|
4998 returns, unless not the whole item is highlighted or it is a
4999 transparent item.
5000 This function is useful for debugging a syntax file.
5001 Example that shows the syntax stack under the cursor: >
5002 for id in synstack(line("."), col("."))
5003 echo synIDattr(id, "name")
5004 endfor
5006 system({expr} [, {input}]) *system()* *E677*
5007 Get the output of the shell command {expr}.
5008 When {input} is given, this string is written to a file and
5009 passed as stdin to the command. The string is written as-is,
5010 you need to take care of using the correct line separators
5011 yourself. Pipes are not used.
5012 Note: newlines in {expr} may cause the command to fail. The
5013 characters in 'shellquote' and 'shellxquote' may also cause
5014 trouble.
5015 This is not to be used for interactive commands.
5016 The result is a String. Example: >
5018 :let files = system("ls")
5020 < To make the result more system-independent, the shell output
5021 is filtered to replace <CR> with <NL> for Macintosh, and
5022 <CR><NL> with <NL> for DOS-like systems.
5023 The command executed is constructed using several options:
5024 'shell' 'shellcmdflag' 'shellxquote' {expr} 'shellredir' {tmp} 'shellxquote'
5025 ({tmp} is an automatically generated file name).
5026 For Unix and OS/2 braces are put around {expr} to allow for
5027 concatenated commands.
5029 The command will be executed in "cooked" mode, so that a
5030 CTRL-C will interrupt the command (on Unix at least).
5032 The resulting error code can be found in |v:shell_error|.
5033 This function will fail in |restricted-mode|.
5035 Note that any wrong value in the options mentioned above may
5036 make the function fail. It has also been reported to fail
5037 when using a security agent application.
5038 Unlike ":!cmd" there is no automatic check for changed files.
5039 Use |:checktime| to force a check.
5042 tabpagebuflist([{arg}]) *tabpagebuflist()*
5043 The result is a |List|, where each item is the number of the
5044 buffer associated with each window in the current tab page.
5045 {arg} specifies the number of tab page to be used. When
5046 omitted the current tab page is used.
5047 When {arg} is invalid the number zero is returned.
5048 To get a list of all buffers in all tabs use this: >
5049 tablist = []
5050 for i in range(tabpagenr('$'))
5051 call extend(tablist, tabpagebuflist(i + 1))
5052 endfor
5053 < Note that a buffer may appear in more than one window.
5056 tabpagenr([{arg}]) *tabpagenr()*
5057 The result is a Number, which is the number of the current
5058 tab page. The first tab page has number 1.
5059 When the optional argument is "$", the number of the last tab
5060 page is returned (the tab page count).
5061 The number can be used with the |:tab| command.
5064 tabpagewinnr({tabarg}, [{arg}]) *tabpagewinnr()*
5065 Like |winnr()| but for tab page {arg}.
5066 {tabarg} specifies the number of tab page to be used.
5067 {arg} is used like with |winnr()|:
5068 - When omitted the current window number is returned. This is
5069 the window which will be used when going to this tab page.
5070 - When "$" the number of windows is returned.
5071 - When "#" the previous window nr is returned.
5072 Useful examples: >
5073 tabpagewinnr(1) " current window of tab page 1
5074 tabpagewinnr(4, '$') " number of windows in tab page 4
5075 < When {tabarg} is invalid zero is returned.
5077 *tagfiles()*
5078 tagfiles() Returns a |List| with the file names used to search for tags
5079 for the current buffer. This is the 'tags' option expanded.
5082 taglist({expr}) *taglist()*
5083 Returns a list of tags matching the regular expression {expr}.
5084 Each list item is a dictionary with at least the following
5085 entries:
5086 name Name of the tag.
5087 filename Name of the file where the tag is
5088 defined. It is either relative to the
5089 current directory or a full path.
5090 cmd Ex command used to locate the tag in
5091 the file.
5092 kind Type of the tag. The value for this
5093 entry depends on the language specific
5094 kind values. Only available when
5095 using a tags file generated by
5096 Exuberant ctags or hdrtag.
5097 static A file specific tag. Refer to
5098 |static-tag| for more information.
5099 More entries may be present, depending on the content of the
5100 tags file: access, implementation, inherits and signature.
5101 Refer to the ctags documentation for information about these
5102 fields. For C code the fields "struct", "class" and "enum"
5103 may appear, they give the name of the entity the tag is
5104 contained in.
5106 The ex-command 'cmd' can be either an ex search pattern, a
5107 line number or a line number followed by a byte number.
5109 If there are no matching tags, then an empty list is returned.
5111 To get an exact tag match, the anchors '^' and '$' should be
5112 used in {expr}. Refer to |tag-regexp| for more information
5113 about the tag search regular expression pattern.
5115 Refer to |'tags'| for information about how the tags file is
5116 located by Vim. Refer to |tags-file-format| for the format of
5117 the tags file generated by the different ctags tools.
5119 tempname() *tempname()* *temp-file-name*
5120 The result is a String, which is the name of a file that
5121 doesn't exist. It can be used for a temporary file. The name
5122 is different for at least 26 consecutive calls. Example: >
5123 :let tmpfile = tempname()
5124 :exe "redir > " . tmpfile
5125 < For Unix, the file will be in a private directory (only
5126 accessible by the current user) to avoid security problems
5127 (e.g., a symlink attack or other people reading your file).
5128 When Vim exits the directory and all files in it are deleted.
5129 For MS-Windows forward slashes are used when the 'shellslash'
5130 option is set or when 'shellcmdflag' starts with '-'.
5132 tolower({expr}) *tolower()*
5133 The result is a copy of the String given, with all uppercase
5134 characters turned into lowercase (just like applying |gu| to
5135 the string).
5137 toupper({expr}) *toupper()*
5138 The result is a copy of the String given, with all lowercase
5139 characters turned into uppercase (just like applying |gU| to
5140 the string).
5142 tr({src}, {fromstr}, {tostr}) *tr()*
5143 The result is a copy of the {src} string with all characters
5144 which appear in {fromstr} replaced by the character in that
5145 position in the {tostr} string. Thus the first character in
5146 {fromstr} is translated into the first character in {tostr}
5147 and so on. Exactly like the unix "tr" command.
5148 This code also deals with multibyte characters properly.
5150 Examples: >
5151 echo tr("hello there", "ht", "HT")
5152 < returns "Hello THere" >
5153 echo tr("<blob>", "<>", "{}")
5154 < returns "{blob}"
5156 *type()*
5157 type({expr}) The result is a Number, depending on the type of {expr}:
5158 Number: 0
5159 String: 1
5160 Funcref: 2
5161 List: 3
5162 Dictionary: 4
5163 To avoid the magic numbers it should be used this way: >
5164 :if type(myvar) == type(0)
5165 :if type(myvar) == type("")
5166 :if type(myvar) == type(function("tr"))
5167 :if type(myvar) == type([])
5168 :if type(myvar) == type({})
5170 values({dict}) *values()*
5171 Return a |List| with all the values of {dict}. The |List| is
5172 in arbitrary order.
5175 virtcol({expr}) *virtcol()*
5176 The result is a Number, which is the screen column of the file
5177 position given with {expr}. That is, the last screen position
5178 occupied by the character at that position, when the screen
5179 would be of unlimited width. When there is a <Tab> at the
5180 position, the returned Number will be the column at the end of
5181 the <Tab>. For example, for a <Tab> in column 1, with 'ts'
5182 set to 8, it returns 8.
5183 For the byte position use |col()|.
5184 For the use of {expr} see |col()|.
5185 When 'virtualedit' is used {expr} can be [lnum, col, off], where
5186 "off" is the offset in screen columns from the start of the
5187 character. E.g., a position within a <Tab> or after the last
5188 character.
5189 When Virtual editing is active in the current mode, a position
5190 beyond the end of the line can be returned. |'virtualedit'|
5191 The accepted positions are:
5192 . the cursor position
5193 $ the end of the cursor line (the result is the
5194 number of displayed characters in the cursor line
5195 plus one)
5196 'x position of mark x (if the mark is not set, 0 is
5197 returned)
5198 Note that only marks in the current file can be used.
5199 Examples: >
5200 virtcol(".") with text "foo^Lbar", with cursor on the "^L", returns 5
5201 virtcol("$") with text "foo^Lbar", returns 9
5202 virtcol("'t") with text " there", with 't at 'h', returns 6
5203 < The first column is 1. 0 is returned for an error.
5204 A more advanced example that echoes the maximum length of
5205 all lines: >
5206 echo max(map(range(1, line('$')), "virtcol([v:val, '$'])"))
5209 visualmode([expr]) *visualmode()*
5210 The result is a String, which describes the last Visual mode
5211 used in the current buffer. Initially it returns an empty
5212 string, but once Visual mode has been used, it returns "v",
5213 "V", or "<CTRL-V>" (a single CTRL-V character) for
5214 character-wise, line-wise, or block-wise Visual mode
5215 respectively.
5216 Example: >
5217 :exe "normal " . visualmode()
5218 < This enters the same Visual mode as before. It is also useful
5219 in scripts if you wish to act differently depending on the
5220 Visual mode that was used.
5222 If an expression is supplied that results in a non-zero number
5223 or a non-empty string, then the Visual mode will be cleared
5224 and the old value is returned. Note that " " and "0" are also
5225 non-empty strings, thus cause the mode to be cleared.
5227 *winbufnr()*
5228 winbufnr({nr}) The result is a Number, which is the number of the buffer
5229 associated with window {nr}. When {nr} is zero, the number of
5230 the buffer in the current window is returned. When window
5231 {nr} doesn't exist, -1 is returned.
5232 Example: >
5233 :echo "The file in the current window is " . bufname(winbufnr(0))
5234 <
5235 *wincol()*
5236 wincol() The result is a Number, which is the virtual column of the
5237 cursor in the window. This is counting screen cells from the
5238 left side of the window. The leftmost column is one.
5240 winheight({nr}) *winheight()*
5241 The result is a Number, which is the height of window {nr}.
5242 When {nr} is zero, the height of the current window is
5243 returned. When window {nr} doesn't exist, -1 is returned.
5244 An existing window always has a height of zero or more.
5245 Examples: >
5246 :echo "The current window has " . winheight(0) . " lines."
5247 <
5248 *winline()*
5249 winline() The result is a Number, which is the screen line of the cursor
5250 in the window. This is counting screen lines from the top of
5251 the window. The first line is one.
5252 If the cursor was moved the view on the file will be updated
5253 first, this may cause a scroll.
5255 *winnr()*
5256 winnr([{arg}]) The result is a Number, which is the number of the current
5257 window. The top window has number 1.
5258 When the optional argument is "$", the number of the
5259 last window is returned (the window count).
5260 When the optional argument is "#", the number of the last
5261 accessed window is returned (where |CTRL-W_p| goes to).
5262 If there is no previous window or it is in another tab page 0
5263 is returned.
5264 The number can be used with |CTRL-W_w| and ":wincmd w"
5265 |:wincmd|.
5266 Also see |tabpagewinnr()|.
5268 *winrestcmd()*
5269 winrestcmd() Returns a sequence of |:resize| commands that should restore
5270 the current window sizes. Only works properly when no windows
5271 are opened or closed and the current window and tab page is
5272 unchanged.
5273 Example: >
5274 :let cmd = winrestcmd()
5275 :call MessWithWindowSizes()
5276 :exe cmd
5277 <
5278 *winrestview()*
5279 winrestview({dict})
5280 Uses the |Dictionary| returned by |winsaveview()| to restore
5281 the view of the current window.
5282 If you have changed the values the result is unpredictable.
5283 If the window size changed the result won't be the same.
5285 *winsaveview()*
5286 winsaveview() Returns a |Dictionary| that contains information to restore
5287 the view of the current window. Use |winrestview()| to
5288 restore the view.
5289 This is useful if you have a mapping that jumps around in the
5290 buffer and you want to go back to the original view.
5291 This does not save fold information. Use the 'foldenable'
5292 option to temporarily switch off folding, so that folds are
5293 not opened when moving around.
5294 The return value includes:
5295 lnum cursor line number
5296 col cursor column
5297 coladd cursor column offset for 'virtualedit'
5298 curswant column for vertical movement
5299 topline first line in the window
5300 topfill filler lines, only in diff mode
5301 leftcol first column displayed
5302 skipcol columns skipped
5303 Note that no option values are saved.
5306 winwidth({nr}) *winwidth()*
5307 The result is a Number, which is the width of window {nr}.
5308 When {nr} is zero, the width of the current window is
5309 returned. When window {nr} doesn't exist, -1 is returned.
5310 An existing window always has a width of zero or more.
5311 Examples: >
5312 :echo "The current window has " . winwidth(0) . " columns."
5313 :if winwidth(0) <= 50
5314 : exe "normal 50\<C-W>|"
5315 :endif
5316 <
5317 *writefile()*
5318 writefile({list}, {fname} [, {binary}])
5319 Write |List| {list} to file {fname}. Each list item is
5320 separated with a NL. Each list item must be a String or
5321 Number.
5322 When {binary} is equal to "b" binary mode is used: There will
5323 not be a NL after the last list item. An empty item at the
5324 end does cause the last line in the file to end in a NL.
5325 All NL characters are replaced with a NUL character.
5326 Inserting CR characters needs to be done before passing {list}
5327 to writefile().
5328 An existing file is overwritten, if possible.
5329 When the write fails -1 is returned, otherwise 0. There is an
5330 error message if the file can't be created or when writing
5331 fails.
5332 Also see |readfile()|.
5333 To copy a file byte for byte: >
5334 :let fl = readfile("foo", "b")
5335 :call writefile(fl, "foocopy", "b")
5336 <
5338 *feature-list*
5339 There are three types of features:
5340 1. Features that are only supported when they have been enabled when Vim
5341 was compiled |+feature-list|. Example: >
5342 :if has("cindent")
5343 2. Features that are only supported when certain conditions have been met.
5344 Example: >
5345 :if has("gui_running")
5346 < *has-patch*
5347 3. Included patches. First check |v:version| for the version of Vim.
5348 Then the "patch123" feature means that patch 123 has been included for
5349 this version. Example (checking version 6.2.148 or later): >
5350 :if v:version > 602 || v:version == 602 && has("patch148")
5351 < Note that it's possible for patch 147 to be omitted even though 148 is
5352 included.
5354 all_builtin_terms Compiled with all builtin terminals enabled.
5355 amiga Amiga version of Vim.
5356 arabic Compiled with Arabic support |Arabic|.
5357 arp Compiled with ARP support (Amiga).
5358 autocmd Compiled with autocommand support. |autocommand|
5359 balloon_eval Compiled with |balloon-eval| support.
5360 balloon_multiline GUI supports multiline balloons.
5361 beos BeOS version of Vim.
5362 browse Compiled with |:browse| support, and browse() will
5363 work.
5364 builtin_terms Compiled with some builtin terminals.
5365 byte_offset Compiled with support for 'o' in 'statusline'
5366 cindent Compiled with 'cindent' support.
5367 clientserver Compiled with remote invocation support |clientserver|.
5368 clipboard Compiled with 'clipboard' support.
5369 cmdline_compl Compiled with |cmdline-completion| support.
5370 cmdline_hist Compiled with |cmdline-history| support.
5371 cmdline_info Compiled with 'showcmd' and 'ruler' support.
5372 comments Compiled with |'comments'| support.
5373 cryptv Compiled with encryption support |encryption|.
5374 cscope Compiled with |cscope| support.
5375 compatible Compiled to be very Vi compatible.
5376 debug Compiled with "DEBUG" defined.
5377 dialog_con Compiled with console dialog support.
5378 dialog_gui Compiled with GUI dialog support.
5379 diff Compiled with |vimdiff| and 'diff' support.
5380 digraphs Compiled with support for digraphs.
5381 dnd Compiled with support for the "~ register |quote_~|.
5382 dos32 32 bits DOS (DJGPP) version of Vim.
5383 dos16 16 bits DOS version of Vim.
5384 ebcdic Compiled on a machine with ebcdic character set.
5385 emacs_tags Compiled with support for Emacs tags.
5386 eval Compiled with expression evaluation support. Always
5387 true, of course!
5388 ex_extra Compiled with extra Ex commands |+ex_extra|.
5389 extra_search Compiled with support for |'incsearch'| and
5390 |'hlsearch'|
5391 farsi Compiled with Farsi support |farsi|.
5392 file_in_path Compiled with support for |gf| and |<cfile>|
5393 filterpipe When 'shelltemp' is off pipes are used for shell
5394 read/write/filter commands
5395 find_in_path Compiled with support for include file searches
5396 |+find_in_path|.
5397 fname_case Case in file names matters (for Amiga, MS-DOS, and
5398 Windows this is not present).
5399 folding Compiled with |folding| support.
5400 footer Compiled with GUI footer support. |gui-footer|
5401 fork Compiled to use fork()/exec() instead of system().
5402 gettext Compiled with message translation |multi-lang|
5403 gui Compiled with GUI enabled.
5404 gui_athena Compiled with Athena GUI.
5405 gui_gtk Compiled with GTK+ GUI (any version).
5406 gui_gtk2 Compiled with GTK+ 2 GUI (gui_gtk is also defined).
5407 gui_mac Compiled with Macintosh GUI.
5408 gui_motif Compiled with Motif GUI.
5409 gui_photon Compiled with Photon GUI.
5410 gui_win32 Compiled with MS Windows Win32 GUI.
5411 gui_win32s idem, and Win32s system being used (Windows 3.1)
5412 gui_running Vim is running in the GUI, or it will start soon.
5413 hangul_input Compiled with Hangul input support. |hangul|
5414 iconv Can use iconv() for conversion.
5415 insert_expand Compiled with support for CTRL-X expansion commands in
5416 Insert mode.
5417 jumplist Compiled with |jumplist| support.
5418 keymap Compiled with 'keymap' support.
5419 langmap Compiled with 'langmap' support.
5420 libcall Compiled with |libcall()| support.
5421 linebreak Compiled with 'linebreak', 'breakat' and 'showbreak'
5422 support.
5423 lispindent Compiled with support for lisp indenting.
5424 listcmds Compiled with commands for the buffer list |:files|
5425 and the argument list |arglist|.
5426 localmap Compiled with local mappings and abbr. |:map-local|
5427 mac Macintosh version of Vim.
5428 macunix Macintosh version of Vim, using Unix files (OS-X).
5429 menu Compiled with support for |:menu|.
5430 mksession Compiled with support for |:mksession|.
5431 modify_fname Compiled with file name modifiers. |filename-modifiers|
5432 mouse Compiled with support mouse.
5433 mouseshape Compiled with support for 'mouseshape'.
5434 mouse_dec Compiled with support for Dec terminal mouse.
5435 mouse_gpm Compiled with support for gpm (Linux console mouse)
5436 mouse_netterm Compiled with support for netterm mouse.
5437 mouse_pterm Compiled with support for qnx pterm mouse.
5438 mouse_xterm Compiled with support for xterm mouse.
5439 multi_byte Compiled with support for editing Korean et al.
5440 multi_byte_ime Compiled with support for IME input method.
5441 multi_lang Compiled with support for multiple languages.
5442 mzscheme Compiled with MzScheme interface |mzscheme|.
5443 netbeans_intg Compiled with support for |netbeans|.
5444 netbeans_enabled Compiled with support for |netbeans| and it's used.
5445 ole Compiled with OLE automation support for Win32.
5446 os2 OS/2 version of Vim.
5447 osfiletype Compiled with support for osfiletypes |+osfiletype|
5448 path_extra Compiled with up/downwards search in 'path' and 'tags'
5449 perl Compiled with Perl interface.
5450 postscript Compiled with PostScript file printing.
5451 printer Compiled with |:hardcopy| support.
5452 profile Compiled with |:profile| support.
5453 python Compiled with Python interface.
5454 qnx QNX version of Vim.
5455 quickfix Compiled with |quickfix| support.
5456 reltime Compiled with |reltime()| support.
5457 rightleft Compiled with 'rightleft' support.
5458 ruby Compiled with Ruby interface |ruby|.
5459 scrollbind Compiled with 'scrollbind' support.
5460 showcmd Compiled with 'showcmd' support.
5461 signs Compiled with |:sign| support.
5462 smartindent Compiled with 'smartindent' support.
5463 sniff Compiled with SNiFF interface support.
5464 statusline Compiled with support for 'statusline', 'rulerformat'
5465 and special formats of 'titlestring' and 'iconstring'.
5466 sun_workshop Compiled with support for Sun |workshop|.
5467 spell Compiled with spell checking support |spell|.
5468 syntax Compiled with syntax highlighting support |syntax|.
5469 syntax_items There are active syntax highlighting items for the
5470 current buffer.
5471 system Compiled to use system() instead of fork()/exec().
5472 tag_binary Compiled with binary searching in tags files
5473 |tag-binary-search|.
5474 tag_old_static Compiled with support for old static tags
5475 |tag-old-static|.
5476 tag_any_white Compiled with support for any white characters in tags
5477 files |tag-any-white|.
5478 tcl Compiled with Tcl interface.
5479 terminfo Compiled with terminfo instead of termcap.
5480 termresponse Compiled with support for |t_RV| and |v:termresponse|.
5481 textobjects Compiled with support for |text-objects|.
5482 tgetent Compiled with tgetent support, able to use a termcap
5483 or terminfo file.
5484 title Compiled with window title support |'title'|.
5485 toolbar Compiled with support for |gui-toolbar|.
5486 unix Unix version of Vim.
5487 user_commands User-defined commands.
5488 viminfo Compiled with viminfo support.
5489 vim_starting True while initial source'ing takes place.
5490 vertsplit Compiled with vertically split windows |:vsplit|.
5491 virtualedit Compiled with 'virtualedit' option.
5492 visual Compiled with Visual mode.
5493 visualextra Compiled with extra Visual mode commands.
5494 |blockwise-operators|.
5495 vms VMS version of Vim.
5496 vreplace Compiled with |gR| and |gr| commands.
5497 wildignore Compiled with 'wildignore' option.
5498 wildmenu Compiled with 'wildmenu' option.
5499 windows Compiled with support for more than one window.
5500 winaltkeys Compiled with 'winaltkeys' option.
5501 win16 Win16 version of Vim (MS-Windows 3.1).
5502 win32 Win32 version of Vim (MS-Windows 95/98/ME/NT/2000/XP).
5503 win64 Win64 version of Vim (MS-Windows 64 bit).
5504 win32unix Win32 version of Vim, using Unix files (Cygwin)
5505 win95 Win32 version for MS-Windows 95/98/ME.
5506 writebackup Compiled with 'writebackup' default on.
5507 xfontset Compiled with X fontset support |xfontset|.
5508 xim Compiled with X input method support |xim|.
5509 xsmp Compiled with X session management support.
5510 xsmp_interact Compiled with interactive X session management support.
5511 xterm_clipboard Compiled with support for xterm clipboard.
5512 xterm_save Compiled with support for saving and restoring the
5513 xterm screen.
5514 x11 Compiled with X11 support.
5516 *string-match*
5517 Matching a pattern in a String
5519 A regexp pattern as explained at |pattern| is normally used to find a match in
5520 the buffer lines. When a pattern is used to find a match in a String, almost
5521 everything works in the same way. The difference is that a String is handled
5522 like it is one line. When it contains a "\n" character, this is not seen as a
5523 line break for the pattern. It can be matched with a "\n" in the pattern, or
5524 with ".". Example: >
5525 :let a = "aaaa\nxxxx"
5526 :echo matchstr(a, "..\n..")
5527 aa
5528 xx
5529 :echo matchstr(a, "a.x")
5530 a
5531 x
5533 Don't forget that "^" will only match at the first character of the String and
5534 "$" at the last character of the string. They don't match after or before a
5535 "\n".
5537 ==============================================================================
5538 5. Defining functions *user-functions*
5540 New functions can be defined. These can be called just like builtin
5541 functions. The function executes a sequence of Ex commands. Normal mode
5542 commands can be executed with the |:normal| command.
5544 The function name must start with an uppercase letter, to avoid confusion with
5545 builtin functions. To prevent from using the same name in different scripts
5546 avoid obvious, short names. A good habit is to start the function name with
5547 the name of the script, e.g., "HTMLcolor()".
5549 It's also possible to use curly braces, see |curly-braces-names|. And the
5550 |autoload| facility is useful to define a function only when it's called.
5552 *local-function*
5553 A function local to a script must start with "s:". A local script function
5554 can only be called from within the script and from functions, user commands
5555 and autocommands defined in the script. It is also possible to call the
5556 function from a mappings defined in the script, but then |<SID>| must be used
5557 instead of "s:" when the mapping is expanded outside of the script.
5559 *:fu* *:function* *E128* *E129* *E123*
5560 :fu[nction] List all functions and their arguments.
5562 :fu[nction] {name} List function {name}.
5563 {name} can also be a |Dictionary| entry that is a
5564 |Funcref|: >
5565 :function dict.init
5567 :fu[nction] /{pattern} List functions with a name matching {pattern}.
5568 Example that lists all functions ending with "File": >
5569 :function /File$
5570 <
5571 *:function-verbose*
5572 When 'verbose' is non-zero, listing a function will also display where it was
5573 last defined. Example: >
5575 :verbose function SetFileTypeSH
5576 function SetFileTypeSH(name)
5577 Last set from /usr/share/vim/vim-7.0/filetype.vim
5578 <
5579 See |:verbose-cmd| for more information.
5581 *E124* *E125*
5582 :fu[nction][!] {name}([arguments]) [range] [abort] [dict]
5583 Define a new function by the name {name}. The name
5584 must be made of alphanumeric characters and '_', and
5585 must start with a capital or "s:" (see above).
5587 {name} can also be a |Dictionary| entry that is a
5588 |Funcref|: >
5589 :function dict.init(arg)
5590 < "dict" must be an existing dictionary. The entry
5591 "init" is added if it didn't exist yet. Otherwise [!]
5592 is required to overwrite an existing function. The
5593 result is a |Funcref| to a numbered function. The
5594 function can only be used with a |Funcref| and will be
5595 deleted if there are no more references to it.
5596 *E127* *E122*
5597 When a function by this name already exists and [!] is
5598 not used an error message is given. When [!] is used,
5599 an existing function is silently replaced. Unless it
5600 is currently being executed, that is an error.
5602 For the {arguments} see |function-argument|.
5604 *a:firstline* *a:lastline*
5605 When the [range] argument is added, the function is
5606 expected to take care of a range itself. The range is
5607 passed as "a:firstline" and "a:lastline". If [range]
5608 is excluded, ":{range}call" will call the function for
5609 each line in the range, with the cursor on the start
5610 of each line. See |function-range-example|.
5612 When the [abort] argument is added, the function will
5613 abort as soon as an error is detected.
5615 When the [dict] argument is added, the function must
5616 be invoked through an entry in a |Dictionary|. The
5617 local variable "self" will then be set to the
5618 dictionary. See |Dictionary-function|.
5620 The last used search pattern and the redo command "."
5621 will not be changed by the function.
5623 *:endf* *:endfunction* *E126* *E193*
5624 :endf[unction] The end of a function definition. Must be on a line
5625 by its own, without other commands.
5627 *:delf* *:delfunction* *E130* *E131*
5628 :delf[unction] {name} Delete function {name}.
5629 {name} can also be a |Dictionary| entry that is a
5630 |Funcref|: >
5631 :delfunc dict.init
5632 < This will remove the "init" entry from "dict". The
5633 function is deleted if there are no more references to
5634 it.
5635 *:retu* *:return* *E133*
5636 :retu[rn] [expr] Return from a function. When "[expr]" is given, it is
5637 evaluated and returned as the result of the function.
5638 If "[expr]" is not given, the number 0 is returned.
5639 When a function ends without an explicit ":return",
5640 the number 0 is returned.
5641 Note that there is no check for unreachable lines,
5642 thus there is no warning if commands follow ":return".
5644 If the ":return" is used after a |:try| but before the
5645 matching |:finally| (if present), the commands
5646 following the ":finally" up to the matching |:endtry|
5647 are executed first. This process applies to all
5648 nested ":try"s inside the function. The function
5649 returns at the outermost ":endtry".
5651 *function-argument* *a:var*
5652 An argument can be defined by giving its name. In the function this can then
5653 be used as "a:name" ("a:" for argument).
5654 *a:0* *a:1* *a:000* *E740* *...*
5655 Up to 20 arguments can be given, separated by commas. After the named
5656 arguments an argument "..." can be specified, which means that more arguments
5657 may optionally be following. In the function the extra arguments can be used
5658 as "a:1", "a:2", etc. "a:0" is set to the number of extra arguments (which
5659 can be 0). "a:000" is set to a |List| that contains these arguments. Note
5660 that "a:1" is the same as "a:000[0]".
5661 *E742*
5662 The a: scope and the variables in it cannot be changed, they are fixed.
5663 However, if a |List| or |Dictionary| is used, you can changes their contents.
5664 Thus you can pass a |List| to a function and have the function add an item to
5665 it. If you want to make sure the function cannot change a |List| or
5666 |Dictionary| use |:lockvar|.
5668 When not using "...", the number of arguments in a function call must be equal
5669 to the number of named arguments. When using "...", the number of arguments
5670 may be larger.
5672 It is also possible to define a function without any arguments. You must
5673 still supply the () then. The body of the function follows in the next lines,
5674 until the matching |:endfunction|. It is allowed to define another function
5675 inside a function body.
5677 *local-variables*
5678 Inside a function variables can be used. These are local variables, which
5679 will disappear when the function returns. Global variables need to be
5680 accessed with "g:".
5682 Example: >
5683 :function Table(title, ...)
5684 : echohl Title
5685 : echo a:title
5686 : echohl None
5687 : echo a:0 . " items:"
5688 : for s in a:000
5689 : echon ' ' . s
5690 : endfor
5691 :endfunction
5693 This function can then be called with: >
5694 call Table("Table", "line1", "line2")
5695 call Table("Empty Table")
5697 To return more than one value, return a |List|: >
5698 :function Compute(n1, n2)
5699 : if a:n2 == 0
5700 : return ["fail", 0]
5701 : endif
5702 : return ["ok", a:n1 / a:n2]
5703 :endfunction
5705 This function can then be called with: >
5706 :let [success, div] = Compute(102, 6)
5707 :if success == "ok"
5708 : echo div
5709 :endif
5710 <
5711 *:cal* *:call* *E107* *E117*
5712 :[range]cal[l] {name}([arguments])
5713 Call a function. The name of the function and its arguments
5714 are as specified with |:function|. Up to 20 arguments can be
5715 used. The returned value is discarded.
5716 Without a range and for functions that accept a range, the
5717 function is called once. When a range is given the cursor is
5718 positioned at the start of the first line before executing the
5719 function.
5720 When a range is given and the function doesn't handle it
5721 itself, the function is executed for each line in the range,
5722 with the cursor in the first column of that line. The cursor
5723 is left at the last line (possibly moved by the last function
5724 call). The arguments are re-evaluated for each line. Thus
5725 this works:
5726 *function-range-example* >
5727 :function Mynumber(arg)
5728 : echo line(".") . " " . a:arg
5729 :endfunction
5730 :1,5call Mynumber(getline("."))
5731 <
5732 The "a:firstline" and "a:lastline" are defined anyway, they
5733 can be used to do something different at the start or end of
5734 the range.
5736 Example of a function that handles the range itself: >
5738 :function Cont() range
5739 : execute (a:firstline + 1) . "," . a:lastline . 's/^/\t\\ '
5740 :endfunction
5741 :4,8call Cont()
5742 <
5743 This function inserts the continuation character "\" in front
5744 of all the lines in the range, except the first one.
5746 When the function returns a composite value it can be further
5747 dereferenced, but the range will not be used then. Example: >
5748 :4,8call GetDict().method()
5749 < Here GetDict() gets the range but method() does not.
5751 *E132*
5752 The recursiveness of user functions is restricted with the |'maxfuncdepth'|
5753 option.
5756 AUTOMATICALLY LOADING FUNCTIONS ~
5757 *autoload-functions*
5758 When using many or large functions, it's possible to automatically define them
5759 only when they are used. There are two methods: with an autocommand and with
5760 the "autoload" directory in 'runtimepath'.
5763 Using an autocommand ~
5765 This is introduced in the user manual, section |41.14|.
5767 The autocommand is useful if you have a plugin that is a long Vim script file.
5768 You can define the autocommand and quickly quit the script with |:finish|.
5769 That makes Vim startup faster. The autocommand should then load the same file
5770 again, setting a variable to skip the |:finish| command.
5772 Use the FuncUndefined autocommand event with a pattern that matches the
5773 function(s) to be defined. Example: >
5775 :au FuncUndefined BufNet* source ~/vim/bufnetfuncs.vim
5777 The file "~/vim/bufnetfuncs.vim" should then define functions that start with
5778 "BufNet". Also see |FuncUndefined|.
5781 Using an autoload script ~
5782 *autoload* *E746*
5783 This is introduced in the user manual, section |41.15|.
5785 Using a script in the "autoload" directory is simpler, but requires using
5786 exactly the right file name. A function that can be autoloaded has a name
5787 like this: >
5789 :call filename#funcname()
5791 When such a function is called, and it is not defined yet, Vim will search the
5792 "autoload" directories in 'runtimepath' for a script file called
5793 "filename.vim". For example "~/.vim/autoload/filename.vim". That file should
5794 then define the function like this: >
5796 function filename#funcname()
5797 echo "Done!"
5798 endfunction
5800 The file name and the name used before the # in the function must match
5801 exactly, and the defined function must have the name exactly as it will be
5802 called.
5804 It is possible to use subdirectories. Every # in the function name works like
5805 a path separator. Thus when calling a function: >
5807 :call foo#bar#func()
5809 Vim will look for the file "autoload/foo/bar.vim" in 'runtimepath'.
5811 This also works when reading a variable that has not been set yet: >
5813 :let l = foo#bar#lvar
5815 However, when the autoload script was already loaded it won't be loaded again
5816 for an unknown variable.
5818 When assigning a value to such a variable nothing special happens. This can
5819 be used to pass settings to the autoload script before it's loaded: >
5821 :let foo#bar#toggle = 1
5822 :call foo#bar#func()
5824 Note that when you make a mistake and call a function that is supposed to be
5825 defined in an autoload script, but the script doesn't actually define the
5826 function, the script will be sourced every time you try to call the function.
5827 And you will get an error message every time.
5829 Also note that if you have two script files, and one calls a function in the
5830 other and vise versa, before the used function is defined, it won't work.
5831 Avoid using the autoload functionality at the toplevel.
5833 Hint: If you distribute a bunch of scripts you can pack them together with the
5834 |vimball| utility. Also read the user manual |distribute-script|.
5836 ==============================================================================
5837 6. Curly braces names *curly-braces-names*
5839 Wherever you can use a variable, you can use a "curly braces name" variable.
5840 This is a regular variable name with one or more expressions wrapped in braces
5841 {} like this: >
5842 my_{adjective}_variable
5844 When Vim encounters this, it evaluates the expression inside the braces, puts
5845 that in place of the expression, and re-interprets the whole as a variable
5846 name. So in the above example, if the variable "adjective" was set to
5847 "noisy", then the reference would be to "my_noisy_variable", whereas if
5848 "adjective" was set to "quiet", then it would be to "my_quiet_variable".
5850 One application for this is to create a set of variables governed by an option
5851 value. For example, the statement >
5852 echo my_{&background}_message
5854 would output the contents of "my_dark_message" or "my_light_message" depending
5855 on the current value of 'background'.
5857 You can use multiple brace pairs: >
5858 echo my_{adverb}_{adjective}_message
5859 ..or even nest them: >
5860 echo my_{ad{end_of_word}}_message
5861 where "end_of_word" is either "verb" or "jective".
5863 However, the expression inside the braces must evaluate to a valid single
5864 variable name, e.g. this is invalid: >
5865 :let foo='a + b'
5866 :echo c{foo}d
5867 .. since the result of expansion is "ca + bd", which is not a variable name.
5869 *curly-braces-function-names*
5870 You can call and define functions by an evaluated name in a similar way.
5871 Example: >
5872 :let func_end='whizz'
5873 :call my_func_{func_end}(parameter)
5875 This would call the function "my_func_whizz(parameter)".
5877 ==============================================================================
5878 7. Commands *expression-commands*
5880 :let {var-name} = {expr1} *:let* *E18*
5881 Set internal variable {var-name} to the result of the
5882 expression {expr1}. The variable will get the type
5883 from the {expr}. If {var-name} didn't exist yet, it
5884 is created.
5886 :let {var-name}[{idx}] = {expr1} *E689*
5887 Set a list item to the result of the expression
5888 {expr1}. {var-name} must refer to a list and {idx}
5889 must be a valid index in that list. For nested list
5890 the index can be repeated.
5891 This cannot be used to add an item to a list.
5893 *E711* *E719*
5894 :let {var-name}[{idx1}:{idx2}] = {expr1} *E708* *E709* *E710*
5895 Set a sequence of items in a |List| to the result of
5896 the expression {expr1}, which must be a list with the
5897 correct number of items.
5898 {idx1} can be omitted, zero is used instead.
5899 {idx2} can be omitted, meaning the end of the list.
5900 When the selected range of items is partly past the
5901 end of the list, items will be added.
5903 *:let+=* *:let-=* *:let.=* *E734*
5904 :let {var} += {expr1} Like ":let {var} = {var} + {expr1}".
5905 :let {var} -= {expr1} Like ":let {var} = {var} - {expr1}".
5906 :let {var} .= {expr1} Like ":let {var} = {var} . {expr1}".
5907 These fail if {var} was not set yet and when the type
5908 of {var} and {expr1} don't fit the operator.
5911 :let ${env-name} = {expr1} *:let-environment* *:let-$*
5912 Set environment variable {env-name} to the result of
5913 the expression {expr1}. The type is always String.
5914 :let ${env-name} .= {expr1}
5915 Append {expr1} to the environment variable {env-name}.
5916 If the environment variable didn't exist yet this
5917 works like "=".
5919 :let @{reg-name} = {expr1} *:let-register* *:let-@*
5920 Write the result of the expression {expr1} in register
5921 {reg-name}. {reg-name} must be a single letter, and
5922 must be the name of a writable register (see
5923 |registers|). "@@" can be used for the unnamed
5924 register, "@/" for the search pattern.
5925 If the result of {expr1} ends in a <CR> or <NL>, the
5926 register will be linewise, otherwise it will be set to
5927 characterwise.
5928 This can be used to clear the last search pattern: >
5929 :let @/ = ""
5930 < This is different from searching for an empty string,
5931 that would match everywhere.
5933 :let @{reg-name} .= {expr1}
5934 Append {expr1} to register {reg-name}. If the
5935 register was empty it's like setting it to {expr1}.
5937 :let &{option-name} = {expr1} *:let-option* *:let-&*
5938 Set option {option-name} to the result of the
5939 expression {expr1}. A String or Number value is
5940 always converted to the type of the option.
5941 For an option local to a window or buffer the effect
5942 is just like using the |:set| command: both the local
5943 value and the global value are changed.
5944 Example: >
5945 :let &path = &path . ',/usr/local/include'
5947 :let &{option-name} .= {expr1}
5948 For a string option: Append {expr1} to the value.
5949 Does not insert a comma like |:set+=|.
5951 :let &{option-name} += {expr1}
5952 :let &{option-name} -= {expr1}
5953 For a number or boolean option: Add or subtract
5954 {expr1}.
5956 :let &l:{option-name} = {expr1}
5957 :let &l:{option-name} .= {expr1}
5958 :let &l:{option-name} += {expr1}
5959 :let &l:{option-name} -= {expr1}
5960 Like above, but only set the local value of an option
5961 (if there is one). Works like |:setlocal|.
5963 :let &g:{option-name} = {expr1}
5964 :let &g:{option-name} .= {expr1}
5965 :let &g:{option-name} += {expr1}
5966 :let &g:{option-name} -= {expr1}
5967 Like above, but only set the global value of an option
5968 (if there is one). Works like |:setglobal|.
5970 :let [{name1}, {name2}, ...] = {expr1} *:let-unpack* *E687* *E688*
5971 {expr1} must evaluate to a |List|. The first item in
5972 the list is assigned to {name1}, the second item to
5973 {name2}, etc.
5974 The number of names must match the number of items in
5975 the |List|.
5976 Each name can be one of the items of the ":let"
5977 command as mentioned above.
5978 Example: >
5979 :let [s, item] = GetItem(s)
5980 < Detail: {expr1} is evaluated first, then the
5981 assignments are done in sequence. This matters if
5982 {name2} depends on {name1}. Example: >
5983 :let x = [0, 1]
5984 :let i = 0
5985 :let [i, x[i]] = [1, 2]
5986 :echo x
5987 < The result is [0, 2].
5989 :let [{name1}, {name2}, ...] .= {expr1}
5990 :let [{name1}, {name2}, ...] += {expr1}
5991 :let [{name1}, {name2}, ...] -= {expr1}
5992 Like above, but append/add/subtract the value for each
5993 |List| item.
5995 :let [{name}, ..., ; {lastname}] = {expr1}
5996 Like |:let-unpack| above, but the |List| may have more
5997 items than there are names. A list of the remaining
5998 items is assigned to {lastname}. If there are no
5999 remaining items {lastname} is set to an empty list.
6000 Example: >
6001 :let [a, b; rest] = ["aval", "bval", 3, 4]
6002 <
6003 :let [{name}, ..., ; {lastname}] .= {expr1}
6004 :let [{name}, ..., ; {lastname}] += {expr1}
6005 :let [{name}, ..., ; {lastname}] -= {expr1}
6006 Like above, but append/add/subtract the value for each
6007 |List| item.
6008 *E106*
6009 :let {var-name} .. List the value of variable {var-name}. Multiple
6010 variable names may be given. Special names recognized
6011 here: *E738*
6012 g: global variables
6013 b: local buffer variables
6014 w: local window variables
6015 t: local tab page variables
6016 s: script-local variables
6017 l: local function variables
6018 v: Vim variables.
6020 :let List the values of all variables. The type of the
6021 variable is indicated before the value:
6022 <nothing> String
6023 # Number
6024 * Funcref
6027 :unl[et][!] {name} ... *:unlet* *:unl* *E108* *E795*
6028 Remove the internal variable {name}. Several variable
6029 names can be given, they are all removed. The name
6030 may also be a |List| or |Dictionary| item.
6031 With [!] no error message is given for non-existing
6032 variables.
6033 One or more items from a |List| can be removed: >
6034 :unlet list[3] " remove fourth item
6035 :unlet list[3:] " remove fourth item to last
6036 < One item from a |Dictionary| can be removed at a time: >
6037 :unlet dict['two']
6038 :unlet dict.two
6040 :lockv[ar][!] [depth] {name} ... *:lockvar* *:lockv*
6041 Lock the internal variable {name}. Locking means that
6042 it can no longer be changed (until it is unlocked).
6043 A locked variable can be deleted: >
6044 :lockvar v
6045 :let v = 'asdf' " fails!
6046 :unlet v
6047 < *E741*
6048 If you try to change a locked variable you get an
6049 error message: "E741: Value of {name} is locked"
6051 [depth] is relevant when locking a |List| or
6052 |Dictionary|. It specifies how deep the locking goes:
6053 1 Lock the |List| or |Dictionary| itself,
6054 cannot add or remove items, but can
6055 still change their values.
6056 2 Also lock the values, cannot change
6057 the items. If an item is a |List| or
6058 |Dictionary|, cannot add or remove
6059 items, but can still change the
6060 values.
6061 3 Like 2 but for the |List| /
6062 |Dictionary| in the |List| /
6063 |Dictionary|, one level deeper.
6064 The default [depth] is 2, thus when {name} is a |List|
6065 or |Dictionary| the values cannot be changed.
6066 *E743*
6067 For unlimited depth use [!] and omit [depth].
6068 However, there is a maximum depth of 100 to catch
6069 loops.
6071 Note that when two variables refer to the same |List|
6072 and you lock one of them, the |List| will also be
6073 locked when used through the other variable.
6074 Example: >
6075 :let l = [0, 1, 2, 3]
6076 :let cl = l
6077 :lockvar l
6078 :let cl[1] = 99 " won't work!
6079 < You may want to make a copy of a list to avoid this.
6080 See |deepcopy()|.
6083 :unlo[ckvar][!] [depth] {name} ... *:unlockvar* *:unlo*
6084 Unlock the internal variable {name}. Does the
6085 opposite of |:lockvar|.
6088 :if {expr1} *:if* *:endif* *:en* *E171* *E579* *E580*
6089 :en[dif] Execute the commands until the next matching ":else"
6090 or ":endif" if {expr1} evaluates to non-zero.
6092 From Vim version 4.5 until 5.0, every Ex command in
6093 between the ":if" and ":endif" is ignored. These two
6094 commands were just to allow for future expansions in a
6095 backwards compatible way. Nesting was allowed. Note
6096 that any ":else" or ":elseif" was ignored, the "else"
6097 part was not executed either.
6099 You can use this to remain compatible with older
6100 versions: >
6101 :if version >= 500
6102 : version-5-specific-commands
6103 :endif
6104 < The commands still need to be parsed to find the
6105 "endif". Sometimes an older Vim has a problem with a
6106 new command. For example, ":silent" is recognized as
6107 a ":substitute" command. In that case ":execute" can
6108 avoid problems: >
6109 :if version >= 600
6110 : execute "silent 1,$delete"
6111 :endif
6112 <
6113 NOTE: The ":append" and ":insert" commands don't work
6114 properly in between ":if" and ":endif".
6116 *:else* *:el* *E581* *E583*
6117 :el[se] Execute the commands until the next matching ":else"
6118 or ":endif" if they previously were not being
6119 executed.
6121 *:elseif* *:elsei* *E582* *E584*
6122 :elsei[f] {expr1} Short for ":else" ":if", with the addition that there
6123 is no extra ":endif".
6125 :wh[ile] {expr1} *:while* *:endwhile* *:wh* *:endw*
6126 *E170* *E585* *E588* *E733*
6127 :endw[hile] Repeat the commands between ":while" and ":endwhile",
6128 as long as {expr1} evaluates to non-zero.
6129 When an error is detected from a command inside the
6130 loop, execution continues after the "endwhile".
6131 Example: >
6132 :let lnum = 1
6133 :while lnum <= line("$")
6134 :call FixLine(lnum)
6135 :let lnum = lnum + 1
6136 :endwhile
6137 <
6138 NOTE: The ":append" and ":insert" commands don't work
6139 properly inside a ":while" and ":for" loop.
6141 :for {var} in {list} *:for* *E690* *E732*
6142 :endfo[r] *:endfo* *:endfor*
6143 Repeat the commands between ":for" and ":endfor" for
6144 each item in {list}. Variable {var} is set to the
6145 value of each item.
6146 When an error is detected for a command inside the
6147 loop, execution continues after the "endfor".
6148 Changing {list} inside the loop affects what items are
6149 used. Make a copy if this is unwanted: >
6150 :for item in copy(mylist)
6151 < When not making a copy, Vim stores a reference to the
6152 next item in the list, before executing the commands
6153 with the current item. Thus the current item can be
6154 removed without effect. Removing any later item means
6155 it will not be found. Thus the following example
6156 works (an inefficient way to make a list empty): >
6157 :for item in mylist
6158 :call remove(mylist, 0)
6159 :endfor
6160 < Note that reordering the list (e.g., with sort() or
6161 reverse()) may have unexpected effects.
6162 Note that the type of each list item should be
6163 identical to avoid errors for the type of {var}
6164 changing. Unlet the variable at the end of the loop
6165 to allow multiple item types.
6167 :for [{var1}, {var2}, ...] in {listlist}
6168 :endfo[r]
6169 Like ":for" above, but each item in {listlist} must be
6170 a list, of which each item is assigned to {var1},
6171 {var2}, etc. Example: >
6172 :for [lnum, col] in [[1, 3], [2, 5], [3, 8]]
6173 :echo getline(lnum)[col]
6174 :endfor
6175 <
6176 *:continue* *:con* *E586*
6177 :con[tinue] When used inside a ":while" or ":for" loop, jumps back
6178 to the start of the loop.
6179 If it is used after a |:try| inside the loop but
6180 before the matching |:finally| (if present), the
6181 commands following the ":finally" up to the matching
6182 |:endtry| are executed first. This process applies to
6183 all nested ":try"s inside the loop. The outermost
6184 ":endtry" then jumps back to the start of the loop.
6186 *:break* *:brea* *E587*
6187 :brea[k] When used inside a ":while" or ":for" loop, skips to
6188 the command after the matching ":endwhile" or
6189 ":endfor".
6190 If it is used after a |:try| inside the loop but
6191 before the matching |:finally| (if present), the
6192 commands following the ":finally" up to the matching
6193 |:endtry| are executed first. This process applies to
6194 all nested ":try"s inside the loop. The outermost
6195 ":endtry" then jumps to the command after the loop.
6197 :try *:try* *:endt* *:endtry* *E600* *E601* *E602*
6198 :endt[ry] Change the error handling for the commands between
6199 ":try" and ":endtry" including everything being
6200 executed across ":source" commands, function calls,
6201 or autocommand invocations.
6203 When an error or interrupt is detected and there is
6204 a |:finally| command following, execution continues
6205 after the ":finally". Otherwise, or when the
6206 ":endtry" is reached thereafter, the next
6207 (dynamically) surrounding ":try" is checked for
6208 a corresponding ":finally" etc. Then the script
6209 processing is terminated. (Whether a function
6210 definition has an "abort" argument does not matter.)
6211 Example: >
6212 :try | edit too much | finally | echo "cleanup" | endtry
6213 :echo "impossible" " not reached, script terminated above
6214 <
6215 Moreover, an error or interrupt (dynamically) inside
6216 ":try" and ":endtry" is converted to an exception. It
6217 can be caught as if it were thrown by a |:throw|
6218 command (see |:catch|). In this case, the script
6219 processing is not terminated.
6221 The value "Vim:Interrupt" is used for an interrupt
6222 exception. An error in a Vim command is converted
6223 to a value of the form "Vim({command}):{errmsg}",
6224 other errors are converted to a value of the form
6225 "Vim:{errmsg}". {command} is the full command name,
6226 and {errmsg} is the message that is displayed if the
6227 error exception is not caught, always beginning with
6228 the error number.
6229 Examples: >
6230 :try | sleep 100 | catch /^Vim:Interrupt$/ | endtry
6231 :try | edit | catch /^Vim(edit):E\d\+/ | echo "error" | endtry
6232 <
6233 *:cat* *:catch* *E603* *E604* *E605*
6234 :cat[ch] /{pattern}/ The following commands until the next ":catch",
6235 |:finally|, or |:endtry| that belongs to the same
6236 |:try| as the ":catch" are executed when an exception
6237 matching {pattern} is being thrown and has not yet
6238 been caught by a previous ":catch". Otherwise, these
6239 commands are skipped.
6240 When {pattern} is omitted all errors are caught.
6241 Examples: >
6242 :catch /^Vim:Interrupt$/ " catch interrupts (CTRL-C)
6243 :catch /^Vim\%((\a\+)\)\=:E/ " catch all Vim errors
6244 :catch /^Vim\%((\a\+)\)\=:/ " catch errors and interrupts
6245 :catch /^Vim(write):/ " catch all errors in :write
6246 :catch /^Vim\%((\a\+)\)\=:E123/ " catch error E123
6247 :catch /my-exception/ " catch user exception
6248 :catch /.*/ " catch everything
6249 :catch " same as /.*/
6250 <
6251 Another character can be used instead of / around the
6252 {pattern}, so long as it does not have a special
6253 meaning (e.g., '|' or '"') and doesn't occur inside
6254 {pattern}.
6255 NOTE: It is not reliable to ":catch" the TEXT of
6256 an error message because it may vary in different
6257 locales.
6259 *:fina* *:finally* *E606* *E607*
6260 :fina[lly] The following commands until the matching |:endtry|
6261 are executed whenever the part between the matching
6262 |:try| and the ":finally" is left: either by falling
6263 through to the ":finally" or by a |:continue|,
6264 |:break|, |:finish|, or |:return|, or by an error or
6265 interrupt or exception (see |:throw|).
6267 *:th* *:throw* *E608*
6268 :th[row] {expr1} The {expr1} is evaluated and thrown as an exception.
6269 If the ":throw" is used after a |:try| but before the
6270 first corresponding |:catch|, commands are skipped
6271 until the first ":catch" matching {expr1} is reached.
6272 If there is no such ":catch" or if the ":throw" is
6273 used after a ":catch" but before the |:finally|, the
6274 commands following the ":finally" (if present) up to
6275 the matching |:endtry| are executed. If the ":throw"
6276 is after the ":finally", commands up to the ":endtry"
6277 are skipped. At the ":endtry", this process applies
6278 again for the next dynamically surrounding ":try"
6279 (which may be found in a calling function or sourcing
6280 script), until a matching ":catch" has been found.
6281 If the exception is not caught, the command processing
6282 is terminated.
6283 Example: >
6284 :try | throw "oops" | catch /^oo/ | echo "caught" | endtry
6285 <
6287 *:ec* *:echo*
6288 :ec[ho] {expr1} .. Echoes each {expr1}, with a space in between. The
6289 first {expr1} starts on a new line.
6290 Also see |:comment|.
6291 Use "\n" to start a new line. Use "\r" to move the
6292 cursor to the first column.
6293 Uses the highlighting set by the |:echohl| command.
6294 Cannot be followed by a comment.
6295 Example: >
6296 :echo "the value of 'shell' is" &shell
6297 < *:echo-redraw*
6298 A later redraw may make the message disappear again.
6299 And since Vim mostly postpones redrawing until it's
6300 finished with a sequence of commands this happens
6301 quite often. To avoid that a command from before the
6302 ":echo" causes a redraw afterwards (redraws are often
6303 postponed until you type something), force a redraw
6304 with the |:redraw| command. Example: >
6305 :new | redraw | echo "there is a new window"
6306 <
6307 *:echon*
6308 :echon {expr1} .. Echoes each {expr1}, without anything added. Also see
6309 |:comment|.
6310 Uses the highlighting set by the |:echohl| command.
6311 Cannot be followed by a comment.
6312 Example: >
6313 :echon "the value of 'shell' is " &shell
6314 <
6315 Note the difference between using ":echo", which is a
6316 Vim command, and ":!echo", which is an external shell
6317 command: >
6318 :!echo % --> filename
6319 < The arguments of ":!" are expanded, see |:_%|. >
6320 :!echo "%" --> filename or "filename"
6321 < Like the previous example. Whether you see the double
6322 quotes or not depends on your 'shell'. >
6323 :echo % --> nothing
6324 < The '%' is an illegal character in an expression. >
6325 :echo "%" --> %
6326 < This just echoes the '%' character. >
6327 :echo expand("%") --> filename
6328 < This calls the expand() function to expand the '%'.
6330 *:echoh* *:echohl*
6331 :echoh[l] {name} Use the highlight group {name} for the following
6332 |:echo|, |:echon| and |:echomsg| commands. Also used
6333 for the |input()| prompt. Example: >
6334 :echohl WarningMsg | echo "Don't panic!" | echohl None
6335 < Don't forget to set the group back to "None",
6336 otherwise all following echo's will be highlighted.
6338 *:echom* *:echomsg*
6339 :echom[sg] {expr1} .. Echo the expression(s) as a true message, saving the
6340 message in the |message-history|.
6341 Spaces are placed between the arguments as with the
6342 |:echo| command. But unprintable characters are
6343 displayed, not interpreted.
6344 The parsing works slightly different from |:echo|,
6345 more like |:execute|. All the expressions are first
6346 evaluated and concatenated before echoing anything.
6347 The expressions must evaluate to a Number or String, a
6348 Dictionary or List causes an error.
6349 Uses the highlighting set by the |:echohl| command.
6350 Example: >
6351 :echomsg "It's a Zizzer Zazzer Zuzz, as you can plainly see."
6352 < See |:echo-redraw| to avoid the message disappearing
6353 when the screen is redrawn.
6354 *:echoe* *:echoerr*
6355 :echoe[rr] {expr1} .. Echo the expression(s) as an error message, saving the
6356 message in the |message-history|. When used in a
6357 script or function the line number will be added.
6358 Spaces are placed between the arguments as with the
6359 :echo command. When used inside a try conditional,
6360 the message is raised as an error exception instead
6361 (see |try-echoerr|).
6362 Example: >
6363 :echoerr "This script just failed!"
6364 < If you just want a highlighted message use |:echohl|.
6365 And to get a beep: >
6366 :exe "normal \<Esc>"
6367 <
6368 *:exe* *:execute*
6369 :exe[cute] {expr1} .. Executes the string that results from the evaluation
6370 of {expr1} as an Ex command. Multiple arguments are
6371 concatenated, with a space in between. {expr1} is
6372 used as the processed command, command line editing
6373 keys are not recognized.
6374 Cannot be followed by a comment.
6375 Examples: >
6376 :execute "buffer " nextbuf
6377 :execute "normal " count . "w"
6378 <
6379 ":execute" can be used to append a command to commands
6380 that don't accept a '|'. Example: >
6381 :execute '!ls' | echo "theend"
6383 < ":execute" is also a nice way to avoid having to type
6384 control characters in a Vim script for a ":normal"
6385 command: >
6386 :execute "normal ixxx\<Esc>"
6387 < This has an <Esc> character, see |expr-string|.
6389 Note: The executed string may be any command-line, but
6390 you cannot start or end a "while", "for" or "if"
6391 command. Thus this is illegal: >
6392 :execute 'while i > 5'
6393 :execute 'echo "test" | break'
6394 <
6395 It is allowed to have a "while" or "if" command
6396 completely in the executed string: >
6397 :execute 'while i < 5 | echo i | let i = i + 1 | endwhile'
6398 <
6400 *:comment*
6401 ":execute", ":echo" and ":echon" cannot be followed by
6402 a comment directly, because they see the '"' as the
6403 start of a string. But, you can use '|' followed by a
6404 comment. Example: >
6405 :echo "foo" | "this is a comment
6407 ==============================================================================
6408 8. Exception handling *exception-handling*
6410 The Vim script language comprises an exception handling feature. This section
6411 explains how it can be used in a Vim script.
6413 Exceptions may be raised by Vim on an error or on interrupt, see
6414 |catch-errors| and |catch-interrupt|. You can also explicitly throw an
6415 exception by using the ":throw" command, see |throw-catch|.
6418 TRY CONDITIONALS *try-conditionals*
6420 Exceptions can be caught or can cause cleanup code to be executed. You can
6421 use a try conditional to specify catch clauses (that catch exceptions) and/or
6422 a finally clause (to be executed for cleanup).
6423 A try conditional begins with a |:try| command and ends at the matching
6424 |:endtry| command. In between, you can use a |:catch| command to start
6425 a catch clause, or a |:finally| command to start a finally clause. There may
6426 be none or multiple catch clauses, but there is at most one finally clause,
6427 which must not be followed by any catch clauses. The lines before the catch
6428 clauses and the finally clause is called a try block. >
6430 :try
6431 : ...
6432 : ... TRY BLOCK
6433 : ...
6434 :catch /{pattern}/
6435 : ...
6436 : ... CATCH CLAUSE
6437 : ...
6438 :catch /{pattern}/
6439 : ...
6440 : ... CATCH CLAUSE
6441 : ...
6442 :finally
6443 : ...
6444 : ... FINALLY CLAUSE
6445 : ...
6446 :endtry
6448 The try conditional allows to watch code for exceptions and to take the
6449 appropriate actions. Exceptions from the try block may be caught. Exceptions
6450 from the try block and also the catch clauses may cause cleanup actions.
6451 When no exception is thrown during execution of the try block, the control
6452 is transferred to the finally clause, if present. After its execution, the
6453 script continues with the line following the ":endtry".
6454 When an exception occurs during execution of the try block, the remaining
6455 lines in the try block are skipped. The exception is matched against the
6456 patterns specified as arguments to the ":catch" commands. The catch clause
6457 after the first matching ":catch" is taken, other catch clauses are not
6458 executed. The catch clause ends when the next ":catch", ":finally", or
6459 ":endtry" command is reached - whatever is first. Then, the finally clause
6460 (if present) is executed. When the ":endtry" is reached, the script execution
6461 continues in the following line as usual.
6462 When an exception that does not match any of the patterns specified by the
6463 ":catch" commands is thrown in the try block, the exception is not caught by
6464 that try conditional and none of the catch clauses is executed. Only the
6465 finally clause, if present, is taken. The exception pends during execution of
6466 the finally clause. It is resumed at the ":endtry", so that commands after
6467 the ":endtry" are not executed and the exception might be caught elsewhere,
6468 see |try-nesting|.
6469 When during execution of a catch clause another exception is thrown, the
6470 remaining lines in that catch clause are not executed. The new exception is
6471 not matched against the patterns in any of the ":catch" commands of the same
6472 try conditional and none of its catch clauses is taken. If there is, however,
6473 a finally clause, it is executed, and the exception pends during its
6474 execution. The commands following the ":endtry" are not executed. The new
6475 exception might, however, be caught elsewhere, see |try-nesting|.
6476 When during execution of the finally clause (if present) an exception is
6477 thrown, the remaining lines in the finally clause are skipped. If the finally
6478 clause has been taken because of an exception from the try block or one of the
6479 catch clauses, the original (pending) exception is discarded. The commands
6480 following the ":endtry" are not executed, and the exception from the finally
6481 clause is propagated and can be caught elsewhere, see |try-nesting|.
6483 The finally clause is also executed, when a ":break" or ":continue" for
6484 a ":while" loop enclosing the complete try conditional is executed from the
6485 try block or a catch clause. Or when a ":return" or ":finish" is executed
6486 from the try block or a catch clause of a try conditional in a function or
6487 sourced script, respectively. The ":break", ":continue", ":return", or
6488 ":finish" pends during execution of the finally clause and is resumed when the
6489 ":endtry" is reached. It is, however, discarded when an exception is thrown
6490 from the finally clause.
6491 When a ":break" or ":continue" for a ":while" loop enclosing the complete
6492 try conditional or when a ":return" or ":finish" is encountered in the finally
6493 clause, the rest of the finally clause is skipped, and the ":break",
6494 ":continue", ":return" or ":finish" is executed as usual. If the finally
6495 clause has been taken because of an exception or an earlier ":break",
6496 ":continue", ":return", or ":finish" from the try block or a catch clause,
6497 this pending exception or command is discarded.
6499 For examples see |throw-catch| and |try-finally|.
6502 NESTING OF TRY CONDITIONALS *try-nesting*
6504 Try conditionals can be nested arbitrarily. That is, a complete try
6505 conditional can be put into the try block, a catch clause, or the finally
6506 clause of another try conditional. If the inner try conditional does not
6507 catch an exception thrown in its try block or throws a new exception from one
6508 of its catch clauses or its finally clause, the outer try conditional is
6509 checked according to the rules above. If the inner try conditional is in the
6510 try block of the outer try conditional, its catch clauses are checked, but
6511 otherwise only the finally clause is executed. It does not matter for
6512 nesting, whether the inner try conditional is directly contained in the outer
6513 one, or whether the outer one sources a script or calls a function containing
6514 the inner try conditional.
6516 When none of the active try conditionals catches an exception, just their
6517 finally clauses are executed. Thereafter, the script processing terminates.
6518 An error message is displayed in case of an uncaught exception explicitly
6519 thrown by a ":throw" command. For uncaught error and interrupt exceptions
6520 implicitly raised by Vim, the error message(s) or interrupt message are shown
6521 as usual.
6523 For examples see |throw-catch|.
6526 EXAMINING EXCEPTION HANDLING CODE *except-examine*
6528 Exception handling code can get tricky. If you are in doubt what happens, set
6529 'verbose' to 13 or use the ":13verbose" command modifier when sourcing your
6530 script file. Then you see when an exception is thrown, discarded, caught, or
6531 finished. When using a verbosity level of at least 14, things pending in
6532 a finally clause are also shown. This information is also given in debug mode
6533 (see |debug-scripts|).
6536 THROWING AND CATCHING EXCEPTIONS *throw-catch*
6538 You can throw any number or string as an exception. Use the |:throw| command
6539 and pass the value to be thrown as argument: >
6540 :throw 4711
6541 :throw "string"
6542 < *throw-expression*
6543 You can also specify an expression argument. The expression is then evaluated
6544 first, and the result is thrown: >
6545 :throw 4705 + strlen("string")
6546 :throw strpart("strings", 0, 6)
6548 An exception might be thrown during evaluation of the argument of the ":throw"
6549 command. Unless it is caught there, the expression evaluation is abandoned.
6550 The ":throw" command then does not throw a new exception.
6551 Example: >
6553 :function! Foo(arg)
6554 : try
6555 : throw a:arg
6556 : catch /foo/
6557 : endtry
6558 : return 1
6559 :endfunction
6560 :
6561 :function! Bar()
6562 : echo "in Bar"
6563 : return 4710
6564 :endfunction
6565 :
6566 :throw Foo("arrgh") + Bar()
6568 This throws "arrgh", and "in Bar" is not displayed since Bar() is not
6569 executed. >
6570 :throw Foo("foo") + Bar()
6571 however displays "in Bar" and throws 4711.
6573 Any other command that takes an expression as argument might also be
6574 abandoned by an (uncaught) exception during the expression evaluation. The
6575 exception is then propagated to the caller of the command.
6576 Example: >
6578 :if Foo("arrgh")
6579 : echo "then"
6580 :else
6581 : echo "else"
6582 :endif
6584 Here neither of "then" or "else" is displayed.
6586 *catch-order*
6587 Exceptions can be caught by a try conditional with one or more |:catch|
6588 commands, see |try-conditionals|. The values to be caught by each ":catch"
6589 command can be specified as a pattern argument. The subsequent catch clause
6590 gets executed when a matching exception is caught.
6591 Example: >
6593 :function! Foo(value)
6594 : try
6595 : throw a:value
6596 : catch /^\d\+$/
6597 : echo "Number thrown"
6598 : catch /.*/
6599 : echo "String thrown"
6600 : endtry
6601 :endfunction
6602 :
6603 :call Foo(0x1267)
6604 :call Foo('string')
6606 The first call to Foo() displays "Number thrown", the second "String thrown".
6607 An exception is matched against the ":catch" commands in the order they are
6608 specified. Only the first match counts. So you should place the more
6609 specific ":catch" first. The following order does not make sense: >
6611 : catch /.*/
6612 : echo "String thrown"
6613 : catch /^\d\+$/
6614 : echo "Number thrown"
6616 The first ":catch" here matches always, so that the second catch clause is
6617 never taken.
6619 *throw-variables*
6620 If you catch an exception by a general pattern, you may access the exact value
6621 in the variable |v:exception|: >
6623 : catch /^\d\+$/
6624 : echo "Number thrown. Value is" v:exception
6626 You may also be interested where an exception was thrown. This is stored in
6627 |v:throwpoint|. Note that "v:exception" and "v:throwpoint" are valid for the
6628 exception most recently caught as long it is not finished.
6629 Example: >
6631 :function! Caught()
6632 : if v:exception != ""
6633 : echo 'Caught "' . v:exception . '" in ' . v:throwpoint
6634 : else
6635 : echo 'Nothing caught'
6636 : endif
6637 :endfunction
6638 :
6639 :function! Foo()
6640 : try
6641 : try
6642 : try
6643 : throw 4711
6644 : finally
6645 : call Caught()
6646 : endtry
6647 : catch /.*/
6648 : call Caught()
6649 : throw "oops"
6650 : endtry
6651 : catch /.*/
6652 : call Caught()
6653 : finally
6654 : call Caught()
6655 : endtry
6656 :endfunction
6657 :
6658 :call Foo()
6660 This displays >
6662 Nothing caught
6663 Caught "4711" in function Foo, line 4
6664 Caught "oops" in function Foo, line 10
6665 Nothing caught
6667 A practical example: The following command ":LineNumber" displays the line
6668 number in the script or function where it has been used: >
6670 :function! LineNumber()
6671 : return substitute(v:throwpoint, '.*\D\(\d\+\).*', '\1', "")
6672 :endfunction
6673 :command! LineNumber try | throw "" | catch | echo LineNumber() | endtry
6674 <
6675 *try-nested*
6676 An exception that is not caught by a try conditional can be caught by
6677 a surrounding try conditional: >
6679 :try
6680 : try
6681 : throw "foo"
6682 : catch /foobar/
6683 : echo "foobar"
6684 : finally
6685 : echo "inner finally"
6686 : endtry
6687 :catch /foo/
6688 : echo "foo"
6689 :endtry
6691 The inner try conditional does not catch the exception, just its finally
6692 clause is executed. The exception is then caught by the outer try
6693 conditional. The example displays "inner finally" and then "foo".
6695 *throw-from-catch*
6696 You can catch an exception and throw a new one to be caught elsewhere from the
6697 catch clause: >
6699 :function! Foo()
6700 : throw "foo"
6701 :endfunction
6702 :
6703 :function! Bar()
6704 : try
6705 : call Foo()
6706 : catch /foo/
6707 : echo "Caught foo, throw bar"
6708 : throw "bar"
6709 : endtry
6710 :endfunction
6711 :
6712 :try
6713 : call Bar()
6714 :catch /.*/
6715 : echo "Caught" v:exception
6716 :endtry
6718 This displays "Caught foo, throw bar" and then "Caught bar".
6720 *rethrow*
6721 There is no real rethrow in the Vim script language, but you may throw
6722 "v:exception" instead: >
6724 :function! Bar()
6725 : try
6726 : call Foo()
6727 : catch /.*/
6728 : echo "Rethrow" v:exception
6729 : throw v:exception
6730 : endtry
6731 :endfunction
6732 < *try-echoerr*
6733 Note that this method cannot be used to "rethrow" Vim error or interrupt
6734 exceptions, because it is not possible to fake Vim internal exceptions.
6735 Trying so causes an error exception. You should throw your own exception
6736 denoting the situation. If you want to cause a Vim error exception containing
6737 the original error exception value, you can use the |:echoerr| command: >
6739 :try
6740 : try
6741 : asdf
6742 : catch /.*/
6743 : echoerr v:exception
6744 : endtry
6745 :catch /.*/
6746 : echo v:exception
6747 :endtry
6749 This code displays
6751 Vim(echoerr):Vim:E492: Not an editor command: asdf ~
6754 CLEANUP CODE *try-finally*
6756 Scripts often change global settings and restore them at their end. If the
6757 user however interrupts the script by pressing CTRL-C, the settings remain in
6758 an inconsistent state. The same may happen to you in the development phase of
6759 a script when an error occurs or you explicitly throw an exception without
6760 catching it. You can solve these problems by using a try conditional with
6761 a finally clause for restoring the settings. Its execution is guaranteed on
6762 normal control flow, on error, on an explicit ":throw", and on interrupt.
6763 (Note that errors and interrupts from inside the try conditional are converted
6764 to exceptions. When not caught, they terminate the script after the finally
6765 clause has been executed.)
6766 Example: >
6768 :try
6769 : let s:saved_ts = &ts
6770 : set ts=17
6771 :
6772 : " Do the hard work here.
6773 :
6774 :finally
6775 : let &ts = s:saved_ts
6776 : unlet s:saved_ts
6777 :endtry
6779 This method should be used locally whenever a function or part of a script
6780 changes global settings which need to be restored on failure or normal exit of
6781 that function or script part.
6783 *break-finally*
6784 Cleanup code works also when the try block or a catch clause is left by
6785 a ":continue", ":break", ":return", or ":finish".
6786 Example: >
6788 :let first = 1
6789 :while 1
6790 : try
6791 : if first
6792 : echo "first"
6793 : let first = 0
6794 : continue
6795 : else
6796 : throw "second"
6797 : endif
6798 : catch /.*/
6799 : echo v:exception
6800 : break
6801 : finally
6802 : echo "cleanup"
6803 : endtry
6804 : echo "still in while"
6805 :endwhile
6806 :echo "end"
6808 This displays "first", "cleanup", "second", "cleanup", and "end". >
6810 :function! Foo()
6811 : try
6812 : return 4711
6813 : finally
6814 : echo "cleanup\n"
6815 : endtry
6816 : echo "Foo still active"
6817 :endfunction
6818 :
6819 :echo Foo() "returned by Foo"
6821 This displays "cleanup" and "4711 returned by Foo". You don't need to add an
6822 extra ":return" in the finally clause. (Above all, this would override the
6823 return value.)
6825 *except-from-finally*
6826 Using either of ":continue", ":break", ":return", ":finish", or ":throw" in
6827 a finally clause is possible, but not recommended since it abandons the
6828 cleanup actions for the try conditional. But, of course, interrupt and error
6829 exceptions might get raised from a finally clause.
6830 Example where an error in the finally clause stops an interrupt from
6831 working correctly: >
6833 :try
6834 : try
6835 : echo "Press CTRL-C for interrupt"
6836 : while 1
6837 : endwhile
6838 : finally
6839 : unlet novar
6840 : endtry
6841 :catch /novar/
6842 :endtry
6843 :echo "Script still running"
6844 :sleep 1
6846 If you need to put commands that could fail into a finally clause, you should
6847 think about catching or ignoring the errors in these commands, see
6848 |catch-errors| and |ignore-errors|.
6851 CATCHING ERRORS *catch-errors*
6853 If you want to catch specific errors, you just have to put the code to be
6854 watched in a try block and add a catch clause for the error message. The
6855 presence of the try conditional causes all errors to be converted to an
6856 exception. No message is displayed and |v:errmsg| is not set then. To find
6857 the right pattern for the ":catch" command, you have to know how the format of
6858 the error exception is.
6859 Error exceptions have the following format: >
6861 Vim({cmdname}):{errmsg}
6862 or >
6863 Vim:{errmsg}
6865 {cmdname} is the name of the command that failed; the second form is used when
6866 the command name is not known. {errmsg} is the error message usually produced
6867 when the error occurs outside try conditionals. It always begins with
6868 a capital "E", followed by a two or three-digit error number, a colon, and
6869 a space.
6871 Examples:
6873 The command >
6874 :unlet novar
6875 normally produces the error message >
6876 E108: No such variable: "novar"
6877 which is converted inside try conditionals to an exception >
6878 Vim(unlet):E108: No such variable: "novar"
6880 The command >
6881 :dwim
6882 normally produces the error message >
6883 E492: Not an editor command: dwim
6884 which is converted inside try conditionals to an exception >
6885 Vim:E492: Not an editor command: dwim
6887 You can catch all ":unlet" errors by a >
6888 :catch /^Vim(unlet):/
6889 or all errors for misspelled command names by a >
6890 :catch /^Vim:E492:/
6892 Some error messages may be produced by different commands: >
6893 :function nofunc
6894 and >
6895 :delfunction nofunc
6896 both produce the error message >
6897 E128: Function name must start with a capital: nofunc
6898 which is converted inside try conditionals to an exception >
6899 Vim(function):E128: Function name must start with a capital: nofunc
6900 or >
6901 Vim(delfunction):E128: Function name must start with a capital: nofunc
6902 respectively. You can catch the error by its number independently on the
6903 command that caused it if you use the following pattern: >
6904 :catch /^Vim(\a\+):E128:/
6906 Some commands like >
6907 :let x = novar
6908 produce multiple error messages, here: >
6909 E121: Undefined variable: novar
6910 E15: Invalid expression: novar
6911 Only the first is used for the exception value, since it is the most specific
6912 one (see |except-several-errors|). So you can catch it by >
6913 :catch /^Vim(\a\+):E121:/
6915 You can catch all errors related to the name "nofunc" by >
6916 :catch /\<nofunc\>/
6918 You can catch all Vim errors in the ":write" and ":read" commands by >
6919 :catch /^Vim(\(write\|read\)):E\d\+:/
6921 You can catch all Vim errors by the pattern >
6922 :catch /^Vim\((\a\+)\)\=:E\d\+:/
6923 <
6924 *catch-text*
6925 NOTE: You should never catch the error message text itself: >
6926 :catch /No such variable/
6927 only works in the english locale, but not when the user has selected
6928 a different language by the |:language| command. It is however helpful to
6929 cite the message text in a comment: >
6930 :catch /^Vim(\a\+):E108:/ " No such variable
6933 IGNORING ERRORS *ignore-errors*
6935 You can ignore errors in a specific Vim command by catching them locally: >
6937 :try
6938 : write
6939 :catch
6940 :endtry
6942 But you are strongly recommended NOT to use this simple form, since it could
6943 catch more than you want. With the ":write" command, some autocommands could
6944 be executed and cause errors not related to writing, for instance: >
6946 :au BufWritePre * unlet novar
6948 There could even be such errors you are not responsible for as a script
6949 writer: a user of your script might have defined such autocommands. You would
6950 then hide the error from the user.
6951 It is much better to use >
6953 :try
6954 : write
6955 :catch /^Vim(write):/
6956 :endtry
6958 which only catches real write errors. So catch only what you'd like to ignore
6959 intentionally.
6961 For a single command that does not cause execution of autocommands, you could
6962 even suppress the conversion of errors to exceptions by the ":silent!"
6963 command: >
6964 :silent! nunmap k
6965 This works also when a try conditional is active.
6968 CATCHING INTERRUPTS *catch-interrupt*
6970 When there are active try conditionals, an interrupt (CTRL-C) is converted to
6971 the exception "Vim:Interrupt". You can catch it like every exception. The
6972 script is not terminated, then.
6973 Example: >
6975 :function! TASK1()
6976 : sleep 10
6977 :endfunction
6979 :function! TASK2()
6980 : sleep 20
6981 :endfunction
6983 :while 1
6984 : let command = input("Type a command: ")
6985 : try
6986 : if command == ""
6987 : continue
6988 : elseif command == "END"
6989 : break
6990 : elseif command == "TASK1"
6991 : call TASK1()
6992 : elseif command == "TASK2"
6993 : call TASK2()
6994 : else
6995 : echo "\nIllegal command:" command
6996 : continue
6997 : endif
6998 : catch /^Vim:Interrupt$/
6999 : echo "\nCommand interrupted"
7000 : " Caught the interrupt. Continue with next prompt.
7001 : endtry
7002 :endwhile
7004 You can interrupt a task here by pressing CTRL-C; the script then asks for
7005 a new command. If you press CTRL-C at the prompt, the script is terminated.
7007 For testing what happens when CTRL-C would be pressed on a specific line in
7008 your script, use the debug mode and execute the |>quit| or |>interrupt|
7009 command on that line. See |debug-scripts|.
7012 CATCHING ALL *catch-all*
7014 The commands >
7016 :catch /.*/
7017 :catch //
7018 :catch
7020 catch everything, error exceptions, interrupt exceptions and exceptions
7021 explicitly thrown by the |:throw| command. This is useful at the top level of
7022 a script in order to catch unexpected things.
7023 Example: >
7025 :try
7026 :
7027 : " do the hard work here
7028 :
7029 :catch /MyException/
7030 :
7031 : " handle known problem
7032 :
7033 :catch /^Vim:Interrupt$/
7034 : echo "Script interrupted"
7035 :catch /.*/
7036 : echo "Internal error (" . v:exception . ")"
7037 : echo " - occurred at " . v:throwpoint
7038 :endtry
7039 :" end of script
7041 Note: Catching all might catch more things than you want. Thus, you are
7042 strongly encouraged to catch only for problems that you can really handle by
7043 specifying a pattern argument to the ":catch".
7044 Example: Catching all could make it nearly impossible to interrupt a script
7045 by pressing CTRL-C: >
7047 :while 1
7048 : try
7049 : sleep 1
7050 : catch
7051 : endtry
7052 :endwhile
7055 EXCEPTIONS AND AUTOCOMMANDS *except-autocmd*
7057 Exceptions may be used during execution of autocommands. Example: >
7059 :autocmd User x try
7060 :autocmd User x throw "Oops!"
7061 :autocmd User x catch
7062 :autocmd User x echo v:exception
7063 :autocmd User x endtry
7064 :autocmd User x throw "Arrgh!"
7065 :autocmd User x echo "Should not be displayed"
7066 :
7067 :try
7068 : doautocmd User x
7069 :catch
7070 : echo v:exception
7071 :endtry
7073 This displays "Oops!" and "Arrgh!".
7075 *except-autocmd-Pre*
7076 For some commands, autocommands get executed before the main action of the
7077 command takes place. If an exception is thrown and not caught in the sequence
7078 of autocommands, the sequence and the command that caused its execution are
7079 abandoned and the exception is propagated to the caller of the command.
7080 Example: >
7082 :autocmd BufWritePre * throw "FAIL"
7083 :autocmd BufWritePre * echo "Should not be displayed"
7084 :
7085 :try
7086 : write
7087 :catch
7088 : echo "Caught:" v:exception "from" v:throwpoint
7089 :endtry
7091 Here, the ":write" command does not write the file currently being edited (as
7092 you can see by checking 'modified'), since the exception from the BufWritePre
7093 autocommand abandons the ":write". The exception is then caught and the
7094 script displays: >
7096 Caught: FAIL from BufWrite Auto commands for "*"
7097 <
7098 *except-autocmd-Post*
7099 For some commands, autocommands get executed after the main action of the
7100 command has taken place. If this main action fails and the command is inside
7101 an active try conditional, the autocommands are skipped and an error exception
7102 is thrown that can be caught by the caller of the command.
7103 Example: >
7105 :autocmd BufWritePost * echo "File successfully written!"
7106 :
7107 :try
7108 : write /i/m/p/o/s/s/i/b/l/e
7109 :catch
7110 : echo v:exception
7111 :endtry
7113 This just displays: >
7115 Vim(write):E212: Can't open file for writing (/i/m/p/o/s/s/i/b/l/e)
7117 If you really need to execute the autocommands even when the main action
7118 fails, trigger the event from the catch clause.
7119 Example: >
7121 :autocmd BufWritePre * set noreadonly
7122 :autocmd BufWritePost * set readonly
7123 :
7124 :try
7125 : write /i/m/p/o/s/s/i/b/l/e
7126 :catch
7127 : doautocmd BufWritePost /i/m/p/o/s/s/i/b/l/e
7128 :endtry
7129 <
7130 You can also use ":silent!": >
7132 :let x = "ok"
7133 :let v:errmsg = ""
7134 :autocmd BufWritePost * if v:errmsg != ""
7135 :autocmd BufWritePost * let x = "after fail"
7136 :autocmd BufWritePost * endif
7137 :try
7138 : silent! write /i/m/p/o/s/s/i/b/l/e
7139 :catch
7140 :endtry
7141 :echo x
7143 This displays "after fail".
7145 If the main action of the command does not fail, exceptions from the
7146 autocommands will be catchable by the caller of the command: >
7148 :autocmd BufWritePost * throw ":-("
7149 :autocmd BufWritePost * echo "Should not be displayed"
7150 :
7151 :try
7152 : write
7153 :catch
7154 : echo v:exception
7155 :endtry
7156 <
7157 *except-autocmd-Cmd*
7158 For some commands, the normal action can be replaced by a sequence of
7159 autocommands. Exceptions from that sequence will be catchable by the caller
7160 of the command.
7161 Example: For the ":write" command, the caller cannot know whether the file
7162 had actually been written when the exception occurred. You need to tell it in
7163 some way. >
7165 :if !exists("cnt")
7166 : let cnt = 0
7167 :
7168 : autocmd BufWriteCmd * if &modified
7169 : autocmd BufWriteCmd * let cnt = cnt + 1
7170 : autocmd BufWriteCmd * if cnt % 3 == 2
7171 : autocmd BufWriteCmd * throw "BufWriteCmdError"
7172 : autocmd BufWriteCmd * endif
7173 : autocmd BufWriteCmd * write | set nomodified
7174 : autocmd BufWriteCmd * if cnt % 3 == 0
7175 : autocmd BufWriteCmd * throw "BufWriteCmdError"
7176 : autocmd BufWriteCmd * endif
7177 : autocmd BufWriteCmd * echo "File successfully written!"
7178 : autocmd BufWriteCmd * endif
7179 :endif
7180 :
7181 :try
7182 : write
7183 :catch /^BufWriteCmdError$/
7184 : if &modified
7185 : echo "Error on writing (file contents not changed)"
7186 : else
7187 : echo "Error after writing"
7188 : endif
7189 :catch /^Vim(write):/
7190 : echo "Error on writing"
7191 :endtry
7193 When this script is sourced several times after making changes, it displays
7194 first >
7195 File successfully written!
7196 then >
7197 Error on writing (file contents not changed)
7198 then >
7199 Error after writing
7200 etc.
7202 *except-autocmd-ill*
7203 You cannot spread a try conditional over autocommands for different events.
7204 The following code is ill-formed: >
7206 :autocmd BufWritePre * try
7207 :
7208 :autocmd BufWritePost * catch
7209 :autocmd BufWritePost * echo v:exception
7210 :autocmd BufWritePost * endtry
7211 :
7212 :write
7215 EXCEPTION HIERARCHIES AND PARAMETERIZED EXCEPTIONS *except-hier-param*
7217 Some programming languages allow to use hierarchies of exception classes or to
7218 pass additional information with the object of an exception class. You can do
7219 similar things in Vim.
7220 In order to throw an exception from a hierarchy, just throw the complete
7221 class name with the components separated by a colon, for instance throw the
7222 string "EXCEPT:MATHERR:OVERFLOW" for an overflow in a mathematical library.
7223 When you want to pass additional information with your exception class, add
7224 it in parentheses, for instance throw the string "EXCEPT:IO:WRITEERR(myfile)"
7225 for an error when writing "myfile".
7226 With the appropriate patterns in the ":catch" command, you can catch for
7227 base classes or derived classes of your hierarchy. Additional information in
7228 parentheses can be cut out from |v:exception| with the ":substitute" command.
7229 Example: >
7231 :function! CheckRange(a, func)
7232 : if a:a < 0
7233 : throw "EXCEPT:MATHERR:RANGE(" . a:func . ")"
7234 : endif
7235 :endfunction
7236 :
7237 :function! Add(a, b)
7238 : call CheckRange(a:a, "Add")
7239 : call CheckRange(a:b, "Add")
7240 : let c = a:a + a:b
7241 : if c < 0
7242 : throw "EXCEPT:MATHERR:OVERFLOW"
7243 : endif
7244 : return c
7245 :endfunction
7246 :
7247 :function! Div(a, b)
7248 : call CheckRange(a:a, "Div")
7249 : call CheckRange(a:b, "Div")
7250 : if (a:b == 0)
7251 : throw "EXCEPT:MATHERR:ZERODIV"
7252 : endif
7253 : return a:a / a:b
7254 :endfunction
7255 :
7256 :function! Write(file)
7257 : try
7258 : execute "write" a:file
7259 : catch /^Vim(write):/
7260 : throw "EXCEPT:IO(" . getcwd() . ", " . a:file . "):WRITEERR"
7261 : endtry
7262 :endfunction
7263 :
7264 :try
7265 :
7266 : " something with arithmetics and I/O
7267 :
7268 :catch /^EXCEPT:MATHERR:RANGE/
7269 : let function = substitute(v:exception, '.*(\(\a\+\)).*', '\1', "")
7270 : echo "Range error in" function
7271 :
7272 :catch /^EXCEPT:MATHERR/ " catches OVERFLOW and ZERODIV
7273 : echo "Math error"
7274 :
7275 :catch /^EXCEPT:IO/
7276 : let dir = substitute(v:exception, '.*(\(.\+\),\s*.\+).*', '\1', "")
7277 : let file = substitute(v:exception, '.*(.\+,\s*\(.\+\)).*', '\1', "")
7278 : if file !~ '^/'
7279 : let file = dir . "/" . file
7280 : endif
7281 : echo 'I/O error for "' . file . '"'
7282 :
7283 :catch /^EXCEPT/
7284 : echo "Unspecified error"
7285 :
7286 :endtry
7288 The exceptions raised by Vim itself (on error or when pressing CTRL-C) use
7289 a flat hierarchy: they are all in the "Vim" class. You cannot throw yourself
7290 exceptions with the "Vim" prefix; they are reserved for Vim.
7291 Vim error exceptions are parameterized with the name of the command that
7292 failed, if known. See |catch-errors|.
7295 PECULIARITIES
7296 *except-compat*
7297 The exception handling concept requires that the command sequence causing the
7298 exception is aborted immediately and control is transferred to finally clauses
7299 and/or a catch clause.
7301 In the Vim script language there are cases where scripts and functions
7302 continue after an error: in functions without the "abort" flag or in a command
7303 after ":silent!", control flow goes to the following line, and outside
7304 functions, control flow goes to the line following the outermost ":endwhile"
7305 or ":endif". On the other hand, errors should be catchable as exceptions
7306 (thus, requiring the immediate abortion).
7308 This problem has been solved by converting errors to exceptions and using
7309 immediate abortion (if not suppressed by ":silent!") only when a try
7310 conditional is active. This is no restriction since an (error) exception can
7311 be caught only from an active try conditional. If you want an immediate
7312 termination without catching the error, just use a try conditional without
7313 catch clause. (You can cause cleanup code being executed before termination
7314 by specifying a finally clause.)
7316 When no try conditional is active, the usual abortion and continuation
7317 behavior is used instead of immediate abortion. This ensures compatibility of
7318 scripts written for Vim 6.1 and earlier.
7320 However, when sourcing an existing script that does not use exception handling
7321 commands (or when calling one of its functions) from inside an active try
7322 conditional of a new script, you might change the control flow of the existing
7323 script on error. You get the immediate abortion on error and can catch the
7324 error in the new script. If however the sourced script suppresses error
7325 messages by using the ":silent!" command (checking for errors by testing
7326 |v:errmsg| if appropriate), its execution path is not changed. The error is
7327 not converted to an exception. (See |:silent|.) So the only remaining cause
7328 where this happens is for scripts that don't care about errors and produce
7329 error messages. You probably won't want to use such code from your new
7330 scripts.
7332 *except-syntax-err*
7333 Syntax errors in the exception handling commands are never caught by any of
7334 the ":catch" commands of the try conditional they belong to. Its finally
7335 clauses, however, is executed.
7336 Example: >
7338 :try
7339 : try
7340 : throw 4711
7341 : catch /\(/
7342 : echo "in catch with syntax error"
7343 : catch
7344 : echo "inner catch-all"
7345 : finally
7346 : echo "inner finally"
7347 : endtry
7348 :catch
7349 : echo 'outer catch-all caught "' . v:exception . '"'
7350 : finally
7351 : echo "outer finally"
7352 :endtry
7354 This displays: >
7355 inner finally
7356 outer catch-all caught "Vim(catch):E54: Unmatched \("
7357 outer finally
7358 The original exception is discarded and an error exception is raised, instead.
7360 *except-single-line*
7361 The ":try", ":catch", ":finally", and ":endtry" commands can be put on
7362 a single line, but then syntax errors may make it difficult to recognize the
7363 "catch" line, thus you better avoid this.
7364 Example: >
7365 :try | unlet! foo # | catch | endtry
7366 raises an error exception for the trailing characters after the ":unlet!"
7367 argument, but does not see the ":catch" and ":endtry" commands, so that the
7368 error exception is discarded and the "E488: Trailing characters" message gets
7369 displayed.
7371 *except-several-errors*
7372 When several errors appear in a single command, the first error message is
7373 usually the most specific one and therefor converted to the error exception.
7374 Example: >
7375 echo novar
7376 causes >
7377 E121: Undefined variable: novar
7378 E15: Invalid expression: novar
7379 The value of the error exception inside try conditionals is: >
7380 Vim(echo):E121: Undefined variable: novar
7381 < *except-syntax-error*
7382 But when a syntax error is detected after a normal error in the same command,
7383 the syntax error is used for the exception being thrown.
7384 Example: >
7385 unlet novar #
7386 causes >
7387 E108: No such variable: "novar"
7388 E488: Trailing characters
7389 The value of the error exception inside try conditionals is: >
7390 Vim(unlet):E488: Trailing characters
7391 This is done because the syntax error might change the execution path in a way
7392 not intended by the user. Example: >
7393 try
7394 try | unlet novar # | catch | echo v:exception | endtry
7395 catch /.*/
7396 echo "outer catch:" v:exception
7397 endtry
7398 This displays "outer catch: Vim(unlet):E488: Trailing characters", and then
7399 a "E600: Missing :endtry" error message is given, see |except-single-line|.
7401 ==============================================================================
7402 9. Examples *eval-examples*
7404 Printing in Binary ~
7405 >
7406 :" The function Nr2Bin() returns the Hex string of a number.
7407 :func Nr2Bin(nr)
7408 : let n = a:nr
7409 : let r = ""
7410 : while n
7411 : let r = '01'[n % 2] . r
7412 : let n = n / 2
7413 : endwhile
7414 : return r
7415 :endfunc
7417 :" The function String2Bin() converts each character in a string to a
7418 :" binary string, separated with dashes.
7419 :func String2Bin(str)
7420 : let out = ''
7421 : for ix in range(strlen(a:str))
7422 : let out = out . '-' . Nr2Bin(char2nr(a:str[ix]))
7423 : endfor
7424 : return out[1:]
7425 :endfunc
7427 Example of its use: >
7428 :echo Nr2Bin(32)
7429 result: "100000" >
7430 :echo String2Bin("32")
7431 result: "110011-110010"
7434 Sorting lines ~
7436 This example sorts lines with a specific compare function. >
7438 :func SortBuffer()
7439 : let lines = getline(1, '$')
7440 : call sort(lines, function("Strcmp"))
7441 : call setline(1, lines)
7442 :endfunction
7444 As a one-liner: >
7445 :call setline(1, sort(getline(1, '$'), function("Strcmp")))
7448 scanf() replacement ~
7449 *sscanf*
7450 There is no sscanf() function in Vim. If you need to extract parts from a
7451 line, you can use matchstr() and substitute() to do it. This example shows
7452 how to get the file name, line number and column number out of a line like
7453 "foobar.txt, 123, 45". >
7454 :" Set up the match bit
7455 :let mx='\(\f\+\),\s*\(\d\+\),\s*\(\d\+\)'
7456 :"get the part matching the whole expression
7457 :let l = matchstr(line, mx)
7458 :"get each item out of the match
7459 :let file = substitute(l, mx, '\1', '')
7460 :let lnum = substitute(l, mx, '\2', '')
7461 :let col = substitute(l, mx, '\3', '')
7463 The input is in the variable "line", the results in the variables "file",
7464 "lnum" and "col". (idea from Michael Geddes)
7467 getting the scriptnames in a Dictionary ~
7468 *scriptnames-dictionary*
7469 The |:scriptnames| command can be used to get a list of all script files that
7470 have been sourced. There is no equivalent function or variable for this
7471 (because it's rarely needed). In case you need to manipulate the list this
7472 code can be used: >
7473 " Get the output of ":scriptnames" in the scriptnames_output variable.
7474 let scriptnames_output = ''
7475 redir => scriptnames_output
7476 silent scriptnames
7477 redir END
7479 " Split the output into lines and parse each line. Add an entry to the
7480 " "scripts" dictionary.
7481 let scripts = {}
7482 for line in split(scriptnames_output, "\n")
7483 " Only do non-blank lines.
7484 if line =~ '\S'
7485 " Get the first number in the line.
7486 let nr = matchstr(line, '\d\+')
7487 " Get the file name, remove the script number " 123: ".
7488 let name = substitute(line, '.\+:\s*', '', '')
7489 " Add an item to the Dictionary
7490 let scripts[nr] = name
7491 endif
7492 endfor
7493 unlet scriptnames_output
7495 ==============================================================================
7496 10. No +eval feature *no-eval-feature*
7498 When the |+eval| feature was disabled at compile time, none of the expression
7499 evaluation commands are available. To prevent this from causing Vim scripts
7500 to generate all kinds of errors, the ":if" and ":endif" commands are still
7501 recognized, though the argument of the ":if" and everything between the ":if"
7502 and the matching ":endif" is ignored. Nesting of ":if" blocks is allowed, but
7503 only if the commands are at the start of the line. The ":else" command is not
7504 recognized.
7506 Example of how to avoid executing commands when the |+eval| feature is
7507 missing: >
7509 :if 1
7510 : echo "Expression evaluation is compiled in"
7511 :else
7512 : echo "You will _never_ see this message"
7513 :endif
7515 ==============================================================================
7516 11. The sandbox *eval-sandbox* *sandbox* *E48*
7518 The 'foldexpr', 'includeexpr', 'indentexpr', 'statusline' and 'foldtext'
7519 options are evaluated in a sandbox. This means that you are protected from
7520 these expressions having nasty side effects. This gives some safety for when
7521 these options are set from a modeline. It is also used when the command from
7522 a tags file is executed and for CTRL-R = in the command line.
7523 The sandbox is also used for the |:sandbox| command.
7525 These items are not allowed in the sandbox:
7526 - changing the buffer text
7527 - defining or changing mapping, autocommands, functions, user commands
7528 - setting certain options (see |option-summary|)
7529 - setting certain v: variables (see |v:var|) *E794*
7530 - executing a shell command
7531 - reading or writing a file
7532 - jumping to another buffer or editing a file
7533 - executing Python, Perl, etc. commands
7534 This is not guaranteed 100% secure, but it should block most attacks.
7536 *:san* *:sandbox*
7537 :san[dbox] {cmd} Execute {cmd} in the sandbox. Useful to evaluate an
7538 option that may have been set from a modeline, e.g.
7539 'foldexpr'.
7541 *sandbox-option*
7542 A few options contain an expression. When this expression is evaluated it may
7543 have to be done in the sandbox to avoid a security risk. But the sandbox is
7544 restrictive, thus this only happens when the option was set from an insecure
7545 location. Insecure in this context are:
7546 - sourcing a .vimrc or .exrc in the current directory
7547 - while executing in the sandbox
7548 - value coming from a modeline
7550 Note that when in the sandbox and saving an option value and restoring it, the
7551 option will still be marked as it was set in the sandbox.
7553 ==============================================================================
7554 12. Textlock *textlock*
7556 In a few situations it is not allowed to change the text in the buffer, jump
7557 to another window and some other things that might confuse or break what Vim
7558 is currently doing. This mostly applies to things that happen when Vim is
7559 actually doing something else. For example, evaluating the 'balloonexpr' may
7560 happen any moment the mouse cursor is resting at some position.
7562 This is not allowed when the textlock is active:
7563 - changing the buffer text
7564 - jumping to another buffer or window
7565 - editing another file
7566 - closing a window or quitting Vim
7567 - etc.
7570 vim:tw=78:ts=8:ft=help:norl: