| blob | b77429ebd202faca124dff4bf60fcf0601d31bf4 |
1 ;;; simple.el --- basic editing commands for Emacs
3 ;; Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 ;; 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
5 ;; Free Software Foundation, Inc.
7 ;; Maintainer: FSF
8 ;; Keywords: internal
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
25 ;;; Commentary:
27 ;; A grab-bag of basic Emacs commands not specifically related to some
28 ;; major mode or to file-handling.
30 ;;; Code:
32 ;; This is for lexical-let in apply-partially.
41 "Idle time delay before updating various things on the screen.
42 Various Emacs features that update auxiliary information when point moves
43 wait this many seconds after Emacs becomes idle before doing an update."
49 "Killing and yanking commands."
53 "Highlight (un)matching of parens and expressions."
57 "Search LIST for a valid buffer to display in FRAME.
58 Return nil when all buffers in LIST are undesirable for display,
59 otherwise return the first suitable buffer in LIST.
61 Buffers not visible in windows are preferred to visible buffers,
62 unless VISIBLE-OK is non-nil.
63 If the optional argument FRAME is nil, it defaults to the selected frame.
64 If BUFFER is non-nil, ignore occurrences of that buffer in LIST."
65 ;; This logic is more or less copied from other-buffer.
68 found buf)
81 "Return the last buffer in FRAME's buffer list.
82 If BUFFER is the last buffer, return the preceding buffer instead.
83 Buffers not visible in windows are preferred to visible buffers,
84 unless optional argument VISIBLE-OK is non-nil.
85 Optional third argument FRAME nil or omitted means use the
86 selected frame's buffer list.
87 If no such buffer exists, return the buffer `*scratch*', creating
88 it if necessary."
91 buffer visible-ok frame)
95 scratch)))
98 "Switch to the next buffer in cyclic order."
105 "Switch to the previous buffer in cyclic order."
109 \f
110 ;;; next-error support framework
113 "`next-error' support framework."
119 "Face used to highlight next error locus."
124 "Highlighting of locations in selected source buffers.
125 If a number, highlight the locus in `next-error' face for the given time
126 in seconds, or until the next command is executed.
127 If t, highlight the locus until the next command is executed, or until
128 some other locus replaces it.
129 If nil, don't highlight the locus in the source buffer.
130 If `fringe-arrow', indicate the locus by the fringe arrow."
139 "Highlighting of locations in `next-error-no-select'.
140 If number, highlight the locus in `next-error' face for given time in seconds.
141 If t, highlight the locus indefinitely until some other locus replaces it.
142 If nil, don't highlight the locus in the source buffer.
143 If `fringe-arrow', indicate the locus by the fringe arrow."
152 "Display the line in the visited source file recentered as specified.
153 If non-nil, the value is passed directly to `recenter'."
161 "List of hook functions run by `next-error' after visiting source file."
172 "The most recent `next-error' buffer.
173 A buffer becomes most recent when its compilation, grep, or
178 "Function to use to find the next error in the current buffer.
179 The function is called with 2 parameters:
180 ARG is an integer specifying by how many errors to move.
181 RESET is a boolean which, if non-nil, says to go back to the beginning
182 of the errors before moving.
183 Major modes providing compile-like functionality should set this variable
184 to indicate to `next-error' that this is a candidate buffer and how
189 "Function to use to move to an error locus.
190 It takes two arguments, a buffer position in the error buffer
191 and a buffer position in the error locus buffer.
192 The buffer for the error locus should already be current.
197 &optional avoid-current
198 extra-test-inclusive
199 extra-test-exclusive)
200 "Test if BUFFER is a `next-error' capable buffer.
202 If AVOID-CURRENT is non-nil, treat the current buffer
203 as an absolute last resort only.
205 The function EXTRA-TEST-INCLUSIVE, if non-nil, is called in each buffer
206 that normally would not qualify. If it returns t, the buffer
207 in question is treated as usable.
209 The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called in each buffer
210 that would normally be considered usable. If it returns nil,
211 that buffer is rejected."
216 ;; Optionally reject some buffers.
219 t)
220 ;; Optionally accept some other buffers.
225 extra-test-inclusive
226 extra-test-exclusive)
227 "Return a `next-error' capable buffer.
229 If AVOID-CURRENT is non-nil, treat the current buffer
230 as an absolute last resort only.
232 The function EXTRA-TEST-INCLUSIVE, if non-nil, is called in each buffer
233 that normally would not qualify. If it returns t, the buffer
234 in question is treated as usable.
236 The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called in each buffer
237 that would normally be considered usable. If it returns nil,
238 that buffer is rejected."
240 ;; 1. If one window on the selected frame displays such buffer, return it.
246 avoid-current
247 extra-test-inclusive extra-test-exclusive)
252 ;; 2. If next-error-last-buffer is an acceptable buffer, use that.
255 extra-test-inclusive extra-test-exclusive))
256 next-error-last-buffer)
257 ;; 3. If the current buffer is acceptable, choose it.
259 extra-test-inclusive extra-test-exclusive)
261 ;; 4. Look for any acceptable buffer.
266 extra-test-inclusive extra-test-exclusive)))
269 ;; 5. Use the current buffer as a last resort if it qualifies,
270 ;; even despite AVOID-CURRENT.
273 extra-test-inclusive extra-test-exclusive)
277 ;; 6. Give up.
281 "Visit next `next-error' message and corresponding source code.
283 If all the error messages parsed so far have been processed already,
284 the message buffer is checked for new ones.
286 A prefix ARG specifies how many error messages to move;
287 negative means move back to previous error messages.
289 and start at the first error.
291 The RESET argument specifies that we should restart from the beginning.
294 compilation, grep, or occur buffer. It can also operate on any
296 more generally, on any buffer in Compilation mode or with
297 Compilation Minor mode enabled, or any buffer in which
298 `next-error-function' is bound to an appropriate function.
299 To specify use of a particular buffer for error messages, type
301 in the current frame.
304 runs `next-error-hook' with `run-hooks', and stays with that buffer
305 until you use it in some other buffer which uses Compilation mode
306 or Compilation Minor mode.
308 See variables `compilation-parse-errors-function' and
309 \`compilation-error-regexp-alist' for customization ideas."
313 ;; we know here that next-error-function is a valid symbol we can funcall
321 "Visit the source code corresponding to the `next-error' message at point."
323 ;; we know here that next-error-function is a valid symbol we can funcall
334 "Visit previous `next-error' message and corresponding source code.
336 Prefix arg N says how many error messages to move backwards (or
337 forwards, if negative).
344 "Restart at the first error.
345 Visit corresponding source code.
346 With prefix arg N, visit the source code of the Nth error.
352 "Move point to the next error in the `next-error' buffer and highlight match.
353 Prefix arg N says how many error messages to move forwards (or
354 backwards, if negative).
356 select the source buffer."
363 "Move point to the previous error in the `next-error' buffer and highlight match.
364 Prefix arg N says how many error messages to move backwards (or
365 forwards, if negative).
367 select the source buffer."
371 ;; Internal variable for `next-error-follow-mode-post-command-hook'.
375 "Minor mode for compilation, occur and diff modes.
376 When turned on, cursor motion in the compilation, grep, occur or diff
377 buffer causes automatic display of the corresponding source code
378 location."
385 ;; Used as a `post-command-hook' by `next-error-follow-mode'
386 ;; for the *Compilation* *grep* and *Occur* buffers.
396 \f
397 ;;;
400 "Major mode not specialized for anything in particular.
401 Other major modes are defined by comparison with this one."
407 ;; Special major modes to view specially formatted data rather than files.
419 map))
423 "Parent major mode from which special major modes should inherit."
426 ;; Making and deleting lines.
432 "Insert a newline, and move to left margin of the new line if it's blank.
433 If `use-hard-newlines' is non-nil, the newline is marked with the
434 text-property `hard'.
435 With ARG, insert that many newlines.
436 Call `auto-fill-function' if the current column number is greater
437 than the value of `fill-column' and ARG is nil."
440 ;; Inserting a newline at the end of a line produces better redisplay in
441 ;; try_window_id than inserting at the beginning of a line, and the textual
442 ;; result is the same. So, if we're at beginning of line, pretend to be at
443 ;; the end of the previous line.
446 ;; Make sure no functions want to be told about
447 ;; the range of the changes.
450 ;; Make sure there are no markers here.
453 ;; Make sure no text properties want to know
454 ;; where the change was.
459 ;; Make sure the newline before point isn't intangible.
461 ;; Make sure the newline before point isn't read-only.
463 ;; Make sure the newline before point isn't invisible.
465 ;; Make sure the newline before point has the same
466 ;; properties as the char before it (if any).
473 ;; Call self-insert so that auto-fill, abbrev expansion etc. happens.
474 ;; Set last-command-event to tell self-insert what to insert.
476 ;; Don't auto-fill if we have a numeric argument.
477 ;; Also not if flag is true (it would fill wrong line);
478 ;; there is no need to since we're at BOL.
482 ;; If we get an error in self-insert-command, put point at right place.
484 ;; Even if we did *not* get an error, keep that forward-char;
485 ;; all further processing should apply to the newline that the user
486 ;; thinks he inserted.
488 ;; Mark the newline(s) `hard'.
492 ;; If the newline leaves the previous line blank,
493 ;; and we have a left margin, delete that from the blank line.
501 ;; Indent the line after the newline, except in one case:
502 ;; when we added the newline at the beginning of a line
503 ;; which starts a page.
506 nil)
511 ;; If rear-nonsticky is not "t", add 'hard to rear-nonsticky list
517 "Insert a newline and leave point before it.
518 If there is a fill prefix and/or a `left-margin', insert them
519 on the new line if the line would have been blank.
520 With arg N, insert N newlines."
525 ;; Don't expand an abbrev before point.
539 "Split current line, moving portion beyond point vertically down.
540 If the current line starts with `fill-prefix', insert it on the new
541 line as well. With prefix ARG, don't insert `fill-prefix' on new line.
543 When called from Lisp code, ARG may be a prefix string to copy."
548 ;; What prefix should we check for (nil means don't).
552 ;; Does this line start with it?
563 "Join this line to previous and fix up whitespace at join.
564 If there is a fill prefix, delete it from the beginning of this line.
565 With argument, join this line to following line."
572 ;; If the second line started with the fill prefix,
573 ;; delete the prefix.
585 "On blank line, delete all surrounding blank lines, leaving just one.
586 On isolated blank line, delete that one.
587 On nonblank line, delete any immediately following blank lines."
593 ;; Set singleblank if there is just one blank line here.
600 ;; Delete preceding blank lines, and this one too if it's the only one.
609 ;; Delete following blank lines, unless the current line is blank
610 ;; and there are no following blank lines.
619 ;; Handle the special case where point is followed by newline and eob.
620 ;; Delete the line, leaving point at eob.
625 "Delete all the trailing whitespace across the current buffer.
626 All whitespace after the last non-whitespace character in a line is deleted.
628 A formfeed is not considered whitespace by this function."
635 ;; Don't delete formfeeds, even if they are considered whitespace.
642 "Insert a newline, then indent according to major mode.
643 Indentation is done using the value of `indent-line-function'.
644 In programming language modes, this is the same as TAB.
645 In some text modes, where TAB inserts a tab, this command indents to the
646 column specified by the function `current-left-margin'."
653 "Reindent current line, insert newline, then indent the new line.
654 Indentation of both lines is done according to the current major mode,
655 which means calling the current value of `indent-line-function'.
656 In programming language modes, this is the same as TAB.
657 In some text modes, where TAB inserts a tab, this indents to the
658 column specified by the function `current-left-margin'."
661 ;; Be careful to insert the newline before indenting the line.
662 ;; Otherwise, the indentation might be wrong.
666 ;; We are at EOL before the call to indent-according-to-mode, and
667 ;; after it we usually are as well, but not always. We tried to
668 ;; address it with `save-excursion' but that uses a normal marker
669 ;; whereas we need `move after insertion', so we do the save/restore
670 ;; by hand.
674 ;; Remove the trailing white-space after indentation because
675 ;; indentation may introduce the whitespace.
680 "Read next input character and insert it.
681 This is useful for inserting control characters.
682 With argument, insert ARG copies of the character.
684 If the first character you type after this command is an octal digit,
685 you should type a sequence of octal digits which specify a character code.
686 Any nondigit terminates the sequence. If the terminator is a RET,
687 it is discarded; any other terminator is used itself as input.
688 The variable `read-quoted-char-radix' specifies the radix for this feature;
689 set it to 10 or 16 to use decimal or hex instead of octal.
691 In overwrite mode, this function inserts the character anyway, and
692 does not handle octal digits specially. This means that if you use
693 overwrite as your normal editing mode, you can use this function to
694 insert characters when necessary.
696 In binary overwrite mode, this function does overwrite, and octal
697 digits are interpreted as a character code. This is intended to be
698 useful for editing binary files."
701 ;; Avoid "obsolete" warnings for translation-table-for-input.
708 ;; This used to assume character codes 0240 - 0377 stand for
709 ;; characters in some single-byte character set, and converted them
710 ;; to Emacs characters. But in 23.1 this feature is deprecated
711 ;; in favor of inserting the corresponding Unicode characters.
712 ;; (if (and enable-multibyte-characters
713 ;; (>= char ?\240)
714 ;; (<= char ?\377))
715 ;; (setq char (unibyte-char-to-multibyte char)))
724 "Move forward ARG lines and position at first nonblank character."
730 "Move backward ARG lines and position at first nonblank character."
736 "Move point to the first non-whitespace character on this line."
740 ;; Move back over chars that have whitespace syntax but have the p flag.
744 "Fixup white space between objects around point.
745 Leave one space or none, according to the context."
752 nil
756 "Delete all spaces and tabs around point.
757 If BACKWARD-ONLY is non-nil, only delete them before point."
762 orig-pos
771 "Delete all spaces and tabs around point, leaving one space (or N spaces)."
785 \f
787 "Move point to the beginning of the buffer; leave mark at previous position.
789 With numeric arg N, put point N/10 of the way from the beginning.
791 If the buffer is narrowed, this command uses the beginning and size
792 of the accessible part of the buffer.
794 Don't use this command in Lisp programs!
795 \(goto-char (point-min)) is faster and avoids clobbering the mark."
804 ;; Avoid overflow for large buffer sizes!
812 "Move point to the end of the buffer; leave mark at previous position.
814 With numeric arg N, put point N/10 of the way from the end.
816 If the buffer is narrowed, this command uses the beginning and size
817 of the accessible part of the buffer.
819 Don't use this command in Lisp programs!
820 \(goto-char (point-max)) is faster and avoids clobbering the mark."
827 ;; Avoid overflow for large buffer sizes!
832 ;; If we went to a place in the middle of the buffer,
833 ;; adjust it to the beginning of a line.
836 ;; If the end of the buffer is not already on the screen,
837 ;; then scroll specially to put it near, but not at, the bottom.
842 "Put point at beginning and mark at end of buffer.
843 You probably should not use this function in Lisp programs;
844 it is usually a mistake for a Lisp function to use any subroutine
845 that uses or sets the mark."
850 \f
852 ;; Counting lines, one way or another.
855 "Goto LINE, counting from line 1 at beginning of buffer.
856 Normally, move point in the current buffer, and leave mark at the
858 move point in the most recently selected other buffer, and switch to it.
860 If there's a number in the buffer at point, it is the default for LINE.
862 This function is usually the wrong thing to use in a Lisp program.
863 What you probably want instead is something like:
864 (goto-char (point-min)) (forward-line (1- N))
865 If at all possible, an even better solution is to use char counts
866 rather than line counts."
870 ;; Look for a default, a number in the buffer at point.
879 ;; Decide if we're switching buffers.
887 ;; Read the argument, offering that number (if any) as default.
890 buffer-prompt
891 default)
892 nil nil t
893 'minibuffer-history
894 default)
895 buffer))))
896 ;; Switch to the desired buffer, one way or another.
901 ;; Leave mark at previous position
903 ;; Move to the specified line number in that buffer.
912 "Print number of lines and characters in the region."
918 "Print the current buffer line number and narrowed line number of point."
931 "Return number of lines between START and END.
932 This is usually the number of newlines between them,
933 but can be one more if START is not equal to END
934 and the greater of them is not at the start of a line."
950 done)))
954 "Return (narrowed) buffer line number at position POS.
955 If POS is nil, use current buffer location.
956 Counting starts at (point-min), so the value refers
957 to the contents of the accessible portion of the buffer."
967 "Print info on cursor position (on screen and within buffer).
968 Also describe the character after point, and give its character code
969 in octal, decimal and hex.
971 For a non-ASCII multibyte character, also give its encoding in the
972 buffer's selected coding system if the coding system encodes the
973 character safely. If the character is encoded into one byte, that
974 code is shown in hex. If the character is encoded into more than one
977 In addition, with prefix argument, show details about that character
978 in *Help* buffer. See also the command `describe-char'."
986 ;; Avoid overflow from multiplying by 100!
990 ""
996 pos total percent beg end col hscroll)
998 pos total col hscroll))
1000 encoded encoding-msg display-prop under-display)
1007 ;; Check if the character is displayed with some `display'
1008 ;; text property. In that case, set under-display to the
1009 ;; buffer substring covered by that property.
1020 under-display)))
1026 char char char under-display)
1028 char char char under-display display-prop))
1031 char char char
1033 "..."
1037 ;; We show the detailed information about CHAR.
1044 encoding-msg pos total percent beg end col hscroll)
1051 encoding-msg pos total percent col hscroll))))))
1052 \f
1053 ;; Initialize read-expression-map. It is defined at C level.
1065 "The current default value or list of default values in the minibuffer.
1066 The functions `read-from-minibuffer' and `completing-read' bind
1070 "Value for `print-level' while printing value in `eval-expression'.
1071 A value of nil means no limit."
1077 "Value for `print-length' while printing value in `eval-expression'.
1078 A value of nil means no limit."
1084 "If non-nil set `debug-on-error' to t in `eval-expression'.
1085 If nil, don't change the value of `debug-on-error'."
1091 "Format VALUE as a result of evaluated expression.
1092 Return a formatted string which is displayed in the echo area
1093 in addition to the value printed by prin1 in functions which
1094 display the result of expression evaluation."
1107 ;; We define this, rather than making `eval' interactive,
1108 ;; for the sake of completion of names like eval-region, eval-buffer.
1111 "Evaluate EVAL-EXPRESSION-ARG and print value in the echo area.
1112 Value is also consed on to front of the variable `values'.
1113 Optional argument EVAL-EXPRESSION-INSERT-VALUE, if non-nil, means
1114 insert the result into the current buffer instead of printing it in
1115 the echo area. Truncates long output according to the value of the
1116 variables `eval-expression-print-length' and `eval-expression-print-level'.
1118 If `eval-expression-debug-on-error' is non-nil, which is the default,
1119 this command arranges for all errors to enter the debugger."
1123 nil read-expression-map t
1125 current-prefix-arg))
1130 ;; Bind debug-on-error to something unique so that we can
1131 ;; detect when evaled code changes it.
1135 ;; If evaled code has changed the value of debug-on-error,
1136 ;; propagate that change to the global binding.
1152 "Prompting with PROMPT, let user edit COMMAND and eval result.
1153 COMMAND is a Lisp expression. Let user edit that expression in
1154 the minibuffer, then read and evaluate the result."
1161 read-expression-map t
1163 ;; If command was added to command-history as a string,
1164 ;; get rid of that. We want only evaluable expressions there.
1168 ;; If command to be redone does not match front of history,
1169 ;; add it to the history.
1175 "Edit and re-evaluate last complex command, or ARGth from last.
1176 A complex command is one which used the minibuffer.
1177 The command is placed in the minibuffer as a Lisp form for editing.
1178 The result is executed, repeating the command as changed.
1179 If the command has been changed or is not the most recent previous
1180 command it is added to the front of the command history.
1181 You can use the minibuffer history commands \
1183 to get different commands to edit and resubmit."
1186 newcmd)
1198 ;; If command was added to command-history as a
1199 ;; string, get rid of that. We want only
1200 ;; evaluable expressions there.
1204 ;; If command to be redone does not match front of history,
1205 ;; add it to the history.
1212 \f
1214 "Default minibuffer history list.
1215 This is used for all minibuffer input
1216 except when an alternate history list is specified.
1218 Maximum length of the history list is determined by the value
1221 "Control whether history list elements are expressions or strings.
1222 If the value of this variable equals current minibuffer depth,
1223 they are expressions; otherwise they are strings.
1224 \(That convention is designed to do the right thing for
1231 "Text that was in this minibuffer before any history commands.
1232 This is nil if there have not yet been any history commands
1241 "A point-motion hook for the minibuffer, that moves point out of the prompt."
1245 "Minibuffer history variables for which matching should ignore case.
1246 If a history variable is a member of this list, then the
1248 commands ignore case when searching it, regardless of `case-fold-search'."
1253 "Find the previous history element that matches REGEXP.
1254 \(Previous history elements refer to earlier actions.)
1255 With prefix argument N, search for Nth previous match.
1256 If N is negative, find the next or Nth next match.
1257 Normally, history elements are matched case-insensitively if
1258 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1259 makes the search case-sensitive.
1260 See also `minibuffer-history-case-insensitive-variables'."
1264 nil
1265 minibuffer-local-map
1266 nil
1267 'minibuffer-history-search-history
1269 ;; Use the last regexp specified, by default, if input is empty.
1274 regexp)
1284 ;; On some systems, ignore case for file names.
1286 minibuffer-history-case-insensitive-variables)
1287 t
1288 ;; Respect the user's setting for case-fold-search:
1289 case-fold-search)
1290 nil))
1291 prevpos
1292 match-string
1293 match-offset
1300 "No later matching history item"
1321 next-matching-history-element))
1325 "Find the next history element that matches REGEXP.
1326 \(The next history element refers to a more recent action.)
1327 With prefix argument N, search for Nth next match.
1328 If N is negative, find the previous or Nth previous match.
1329 Normally, history elements are matched case-insensitively if
1330 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1331 makes the search case-sensitive."
1335 nil
1336 minibuffer-local-map
1337 nil
1338 'minibuffer-history-search-history
1340 ;; Use the last regexp specified, by default, if input is empty.
1345 regexp)
1352 "Function run by `goto-history-element' before consuming default values.
1353 This is useful to dynamically add more elements to the list of default values
1354 when `goto-history-element' reaches the end of this list.
1355 Before calling this function `goto-history-element' sets the variable
1356 `minibuffer-default-add-done' to t, so it will call this function only
1357 once. In special cases, when this function needs to be called more
1358 than once, it can set `minibuffer-default-add-done' to nil explicitly,
1362 "When nil, add more elements to the end of the list of default values.
1363 The value nil causes `goto-history-element' to add more elements to
1364 the list of defaults when it reaches the end of this list. It does
1370 "Return a list of all completions without the default value.
1371 This function is used to add all elements of the completion table to
1372 the end of the list of defaults just after the default value."
1375 minibuffer-completion-table
1376 minibuffer-completion-predicate
1377 t)))
1383 "Puts element of the minibuffer history in the minibuffer.
1384 The argument NABS specifies the absolute history position."
1398 elt minibuffer-returned-to-present)
1410 previous-history-element))
1422 minibuffer-default)))
1434 elt))
1438 "Puts next element of the minibuffer history in the minibuffer.
1439 With argument N, it uses the Nth following element."
1445 "Puts previous element of the minibuffer history in the minibuffer.
1446 With argument N, it uses the Nth previous element."
1452 "Get next history element which completes the minibuffer before the point.
1453 The contents of the minibuffer after the point are deleted, and replaced
1454 by the new completion."
1460 n)
1461 ;; next-matching-history-element always puts us at (point-min).
1462 ;; Move to the position we were at before changing the buffer contents.
1463 ;; This is still sensical, because the text before point has not changed.
1467 "\
1468 Get previous history element which completes the minibuffer before the point.
1469 The contents of the minibuffer after the point are deleted, and replaced
1470 by the new completion."
1474 ;; For compatibility with the old subr of the same name.
1476 "Return the display width of the minibuffer prompt.
1477 Return 0 if current buffer is not a minibuffer."
1478 ;; Return the width of everything before the field at the end of
1479 ;; the buffer; this should be 0 for normal buffers.
1481 \f
1482 ;; isearch minibuffer history
1489 "Set up a minibuffer for using isearch to search the minibuffer history.
1490 Intended to be added to `minibuffer-setup-hook'."
1502 "Clean up the minibuffer after terminating isearch in the minibuffer."
1507 "Return the proper search function, for isearch in minibuffer history."
1514 ;; Use standard functions to search within minibuffer text
1520 found)
1521 ;; Avoid lazy-highlighting matches in the minibuffer prompt when
1522 ;; searching forward. Lazy-highlight calls this lambda with the
1523 ;; bound arg, so skip the minibuffer prompt.
1527 ;; 1. First try searching in the initial minibuffer text
1530 noerror)
1531 ;; 2. If the above search fails, start putting next/prev history
1532 ;; elements in the minibuffer successively, and search the string
1533 ;; in them. Do this only when bound is nil (i.e. not while
1534 ;; lazy-highlighting search strings in the current minibuffer text).
1546 ;; After putting the next/prev history element, search
1547 ;; the string in them again, until next-history-element
1548 ;; or previous-history-element raises an error at the
1549 ;; beginning/end of history.
1552 ;; For backward search, don't search
1553 ;; in the minibuffer prompt
1555 noerror)))
1556 ;; Return point of the new search result
1558 ;; Return nil when next(prev)-history-element fails
1562 "Display the minibuffer history search prompt.
1563 If there are no search errors, this function displays an overlay with
1564 the isearch prompt which replaces the original minibuffer prompt.
1565 Otherwise, it displays the standard isearch message returned from
1566 `isearch-message'."
1568 ;; Use standard function `isearch-message' when not in the minibuffer,
1569 ;; or search fails, or has an error (like incomplete regexp).
1570 ;; This function overwrites minibuffer text with isearch message,
1571 ;; so it's possible to see what is wrong in the search string.
1573 ;; Otherwise, put the overlay with the standard isearch prompt over
1574 ;; the initial minibuffer prompt.
1583 ;; And clear any previous isearch message.
1587 "Wrap the minibuffer history search when search fails.
1588 Move point to the first history element for a forward search,
1589 or to the last history element for a backward search."
1591 ;; When `minibuffer-history-isearch-search' fails on reaching the
1592 ;; beginning/end of the history, wrap the search to the first/last
1593 ;; minibuffer history element.
1601 "Save a function restoring the state of minibuffer history search.
1602 Save `minibuffer-history-position' to the additional state parameter
1603 in the search status stack."
1608 "Restore the minibuffer history search state.
1609 Go to the history element by the absolute history position HIST-POS."
1612 \f
1613 ;Put this on C-x u, so we can force that rather than C-_ into startup msg
1617 "Table mapping redo records to the corresponding undo one.
1618 A redo record for undo-in-region maps to t.
1628 "Within a run of consecutive undo commands, list remaining to be undone.
1632 "Undo some previous changes.
1633 Repeat this command to undo more changes.
1634 A numeric ARG serves as a repeat count.
1636 In Transient Mark mode when the mark is active, only undo changes within
1638 as an argument limits undo to changes within the current region."
1640 ;; Make last-command indicate for the next command that this was an undo.
1641 ;; That way, another undo will undo more.
1642 ;; If we get to the end of the undo history and get an error,
1643 ;; another undo command will find the undo history empty
1644 ;; and will get another error. To begin undoing the undos,
1645 ;; you must type some other command.
1648 message)
1649 ;; If we get an error in undo-start,
1650 ;; the next command should not be a "consecutive undo".
1651 ;; So set `this-command' to something other than `undo'.
1656 ;; If something (a timer or filter?) changed the buffer
1657 ;; since the previous command, don't continue the undo seq.
1661 ;; If the last undo record made was made by undo
1662 ;; it shows nothing else happened in between.
1669 ;; get rid of initial undo boundary
1671 ;; If we got this far, the next command should be a consecutive undo.
1673 ;; Check to see whether we're hitting a redo record, and if
1674 ;; so, ask the user whether she wants to skip the redo/undo pair.
1681 ;; The equiv entry might point to another redo record if we have done
1682 ;; undo-redo-undo-redo-... so skip to the very last equiv.
1690 ;; Record the fact that the just-generated undo records come from an
1691 ;; undo operation--that is, they are redo records.
1692 ;; In the ordinary case (not within a region), map the redo
1693 ;; record to the following undos.
1694 ;; I don't know how to do that in the undo-in-region case.
1696 ;; Strip any leading undo boundaries there might be, like we do
1697 ;; above when checking.
1701 undo-equiv-table))
1702 ;; Don't specify a position in the undo record for the undo command.
1703 ;; Instead, undoing this should move point to where the change is.
1722 ;; Record what the current undo list says,
1723 ;; so the next command can tell if the buffer was modified in between.
1726 ;; Display a message announcing success.
1731 "Make BUFFER stop keeping undo information.
1732 No argument or nil as argument means do this for the current buffer."
1738 "Undo some previous changes.
1739 Repeat this command to undo more changes.
1740 A numeric ARG serves as a repeat count.
1741 Contrary to `undo', this will not redo a previous undo."
1746 "Non-nil while performing an undo.
1750 "Undo back N undo-boundaries beyond what was already undone recently.
1751 Call `undo-start' to get ready to undo recent changes,
1752 then call `undo-more' one or more times to undo them."
1757 ;; Note: The following, while pulling elements off
1758 ;; `pending-undo-list' will call primitive change functions which
1759 ;; will push more elements onto `buffer-undo-list'.
1764 ;; Deep copy of a list
1766 "Make a copy of undo list LIST."
1772 elt))
1775 "Set `pending-undo-list' to the front of the undo list.
1776 The next call to `undo-more' will undo the most recently made change.
1777 If BEG and END are specified, then only undo elements
1778 that apply to text between BEG and END are used; other undo elements
1779 are ignored. If BEG and END are nil, all undo elements are used."
1785 buffer-undo-list)))
1790 "Return a list of undo elements for the region START to END.
1791 The elements come from `buffer-undo-list', but we keep only
1792 the elements inside this region, and discard those outside this region.
1793 If we find an element that crosses an edge of this region,
1794 we stop and ignore all further elements."
1797 undo-adjusted-markers
1798 some-rejected
1799 undo-elt undo-elt temp-undo-list delta)
1804 ;; This is a "was unmodified" element.
1805 ;; Keep it if we have kept everything thus far.
1812 ;; Don't put two nils together in the list
1826 ;; Loop down the earlier events adjusting their buffer
1827 ;; positions to reflect the fact that a change to the buffer
1828 ;; isn't being undone. We only need to process those element
1829 ;; types which undo-elt-in-region will return as being in
1830 ;; the region since only those types can ever get into the
1831 ;; output
1840 ;; (TEXT . POSITION)
1847 ;; (BEGIN . END)
1852 ;; (nil PROPERTY VALUE BEG . END)
1862 "Determine whether UNDO-ELT falls inside the region START ... END.
1863 If it crosses the edge, we return nil."
1868 t)
1870 nil)
1872 ;; (TEXT . POSITION)
1876 ;; This is a marker-adjustment element (MARKER . ADJUSTMENT).
1877 ;; See if MARKER is inside the region.
1888 ;; (nil PROPERTY VALUE BEG . END)
1893 ;; (BEGIN . END)
1898 "Test whether UNDO-ELT crosses one edge of that region START ... END.
1899 This assumes we have already decided that UNDO-ELT
1900 is not *inside* the region START...END."
1903 ;; (nil PROPERTY VALUE BEG . END)
1908 ;; (BEGIN . END)
1912 ;; Return the first affected buffer position and the delta for an undo element
1913 ;; delta is defined as the change in subsequent buffer positions if we *did*
1914 ;; the undo.
1918 ;; (TEXT . POSITION)
1921 ;; (BEGIN . END)
1928 "If non-nil ask about discarding undo info for the current command.
1929 Normally, Emacs discards the undo info for the current command if
1930 it exceeds `undo-outer-limit'. But if you set this option
1931 non-nil, it asks in the echo area whether to discard the info.
1932 If you answer no, there is a slight risk that Emacs might crash, so
1933 only do it if you really want to undo the command.
1935 This option is mainly intended for debugging. You have to be
1936 careful if you use it for other purposes. Garbage collection is
1937 inhibited while the question is asked, meaning that Emacs might
1938 leak memory. So you should make sure that you do not wait
1939 excessively long before answering the question."
1945 "If non-nil, an extra level of size that's ok in an undo item.
1946 We don't ask the user about truncating the undo list until the
1947 current item gets bigger than this amount.
1952 ;; When the first undo batch in an undo list is longer than
1953 ;; undo-outer-limit, this function gets called to warn the user that
1954 ;; the undo info for the current command was discarded. Garbage
1955 ;; collection is inhibited around the call, so it had better not do a
1956 ;; lot of consing.
1962 ;; Don't ask the question again unless it gets even bigger.
1963 ;; This applies, in particular, if the user quits from the question.
1964 ;; Such a quit quits out of GC, but something else will call GC
1965 ;; again momentarily. It will call this function again,
1966 ;; but we don't want to ask the question again.
1973 t)
1974 nil))
1979 "The undo info was discarded because it exceeded \
1980 `undo-outer-limit'.
1982 This is normal if you executed a command that made a huge change
1983 to the buffer. In that case, to prevent similar problems in the
1984 future, set `undo-outer-limit' to a value that is large enough to
1985 cover the maximum size of normal changes you expect a single
1986 command to make, but not so large that it might exceed the
1987 maximum memory allotted to Emacs.
1989 If you did not execute any such command, the situation is
1990 probably due to a bug and you should report it.
1992 You can disable the popping up of this buffer by adding the entry
1993 \(undo discard-info) to the user option `warning-suppress-types',
1997 t))
1998 \f
2000 "History list for some commands that read shell commands.
2002 Maximum length of the history list is determined by the value
2009 "*Buffer name for `shell-command' and `shell-command-on-region' error output.
2010 This buffer is used when `shell-command' or `shell-command-on-region'
2011 is run interactively. A value of nil means that output to stderr and
2017 "Return a list of all commands associated with the current file.
2018 This function is used to add all related commands retrieved by `mailcap'
2019 to the end of the list of defaults just after the default value."
2023 minibuffer-default))
2028 commands))
2038 "Dynamically complete shell command at point."
2050 map)
2054 "Read a shell command from the minibuffer.
2055 The arguments are the same as the ones of `read-from-minibuffer',
2056 except READ and KEYMAP are missing and HIST defaults
2057 to `shell-command-history'."
2063 minibuffer-local-shell-command-map
2064 nil
2066 args)))
2069 "Execute string COMMAND asynchronously in background.
2071 Like `shell-command' but if COMMAND doesn't end in ampersand, adds `&'
2072 surrounded by whitespace and executes the command asynchronously.
2073 The output appears in the buffer `*Async Shell Command*'."
2079 current-prefix-arg
2080 shell-command-default-error-buffer))
2086 "Execute string COMMAND in inferior shell; display output, if any.
2087 With prefix argument, insert the COMMAND's output at point.
2089 If COMMAND ends in ampersand, execute it asynchronously.
2090 The output appears in the buffer `*Async Shell Command*'.
2091 That buffer is in shell mode.
2093 Otherwise, COMMAND is executed synchronously. The output appears in
2094 the buffer `*Shell Command Output*'. If the output is short enough to
2095 display in the echo area (which is determined by the variables
2096 `resize-mini-windows' and `max-mini-window-height'), it is shown
2097 there, but it is nonetheless available in buffer `*Shell Command
2098 Output*' even though that buffer is not automatically displayed.
2100 To specify a coding system for converting non-ASCII characters
2102 before this command.
2104 Noninteractive callers can specify coding systems by binding
2105 `coding-system-for-read' and `coding-system-for-write'.
2107 The optional second argument OUTPUT-BUFFER, if non-nil,
2108 says to put the output in some other buffer.
2109 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
2110 If OUTPUT-BUFFER is not a buffer and not nil,
2111 insert output in current buffer. (This cannot be done asynchronously.)
2112 In either case, the output is inserted after point (leaving mark after it).
2114 If the command terminates without error, but generates output,
2116 the output can be displayed in the echo area or in its buffer.
2117 If the output is short enough to display in the echo area
2118 \(determined by the variable `max-mini-window-height' if
2119 `resize-mini-windows' is non-nil), it is shown there.
2120 Otherwise,the buffer containing the output is displayed.
2124 of the output.
2126 If there is no output, or if output is inserted in the current buffer,
2127 then `*Shell Command Output*' is deleted.
2129 If the optional third argument ERROR-BUFFER is non-nil, it is a buffer
2130 or buffer name to which to direct the command's standard error output.
2131 If it is nil, error output is mingled with regular output.
2132 In an interactive call, the variable `shell-command-default-error-buffer'
2133 specifies the value of ERROR-BUFFER."
2140 current-prefix-arg
2141 shell-command-default-error-buffer))
2142 ;; Look for a handler in case default-directory is a remote file name.
2150 ;; Output goes in current buffer.
2156 temporary-file-directory)))
2157 nil)))
2160 ;; We do not use -f for csh; we will not support broken use of
2161 ;; .cshrcs. Even the BSD csh manual says to use
2162 ;; "if ($?prompt) exit" before things which are not useful
2163 ;; non-interactively. Besides, if someone wants their other
2164 ;; aliases for shell commands then they can still have them.
2168 t)
2169 nil shell-command-switch command)
2176 ;; Do no formatting while reading error file,
2177 ;; because that can run a shell command, and we
2178 ;; don't want that to cause an infinite recursion.
2180 ;; Put point after the inserted errors.
2184 ;; This is like exchange-point-and-mark, but doesn't
2185 ;; activate the mark. It is cleaner to avoid activation,
2186 ;; even though the command loop would deactivate the mark
2187 ;; because we inserted text.
2191 ;; Output goes in a separate buffer.
2192 ;; Preserve the match data in case called from a program.
2195 ;; Command ending with ampersand means asynchronous.
2199 proc)
2200 ;; Remove the ampersand.
2202 ;; If will kill a process, query first.
2214 shell-command-switch command))
2218 ;; Use the comint filter for proper handling of carriage motion
2219 ;; (see `comint-inhibit-carriage-motion'),.
2221 ))
2222 ;; Otherwise, command is executed synchronously.
2224 output-buffer nil error-buffer)))))))
2228 "Display MESSAGE in the echo area if possible, otherwise in a pop-up buffer.
2229 MESSAGE may be either a string or a buffer.
2231 A buffer is displayed using `display-buffer' if MESSAGE is too long for
2232 the maximum height of the echo area, as defined by `max-mini-window-height'
2233 if `resize-mini-windows' is non-nil.
2235 Returns either the string shown in the echo area, or when a pop-up
2236 buffer is used, the window used to display it.
2238 If MESSAGE is a string, then the optional argument BUFFER-NAME is the
2239 name of the buffer used to display it in the case where a pop-up buffer
2240 is used, defaulting to `*Message*'. In the case where MESSAGE is a
2241 string and it is displayed in the echo area, it is not specified whether
2242 the contents are inserted into the buffer anyway.
2244 Optional arguments NOT-THIS-WINDOW and FRAME are as for `display-buffer',
2245 and only used if a buffer is displayed."
2247 ;; Trivial case where we can use the echo area
2251 ;; Trivial case where we can just remove single trailing newline
2254 ;; General case
2257 message
2266 0
2270 (<= lines
2274 max-mini-window-height))
2276 max-mini-window-height)
2280 ;; Don't use the echo area if the output buffer is
2281 ;; already dispayed in the selected frame.
2283 ;; Echo area
2289 ;; Buffer
2292 not-this-window frame))))))))
2295 ;; We have a sentinel to prevent insertion of a termination message
2296 ;; in the buffer itself.
2304 &optional output-buffer replace
2305 error-buffer display-error-buffer)
2306 "Execute string COMMAND in inferior shell with region as input.
2307 Normally display output (if any) in temp buffer `*Shell Command Output*';
2308 Prefix arg means replace the region with it. Return the exit code of
2309 COMMAND.
2311 To specify a coding system for converting non-ASCII characters
2313 before this command. By default, the input (from the current buffer)
2314 is encoded in the same coding system that will be used to save the file,
2315 `buffer-file-coding-system'. If the output is going to replace the region,
2316 then it is decoded from that same coding system.
2318 The noninteractive arguments are START, END, COMMAND,
2319 OUTPUT-BUFFER, REPLACE, ERROR-BUFFER, and DISPLAY-ERROR-BUFFER.
2320 Noninteractive callers can specify coding systems by binding
2321 `coding-system-for-read' and `coding-system-for-write'.
2323 If the command generates output, the output may be displayed
2324 in the echo area or in a buffer.
2325 If the output is short enough to display in the echo area
2326 \(determined by the variable `max-mini-window-height' if
2327 `resize-mini-windows' is non-nil), it is shown there. Otherwise
2328 it is displayed in the buffer `*Shell Command Output*'. The output
2329 is available in that buffer in both cases.
2331 If there is output and an error, a message about the error
2332 appears at the end of the output.
2334 If there is no output, or if output is inserted in the current buffer,
2335 then `*Shell Command Output*' is deleted.
2337 If the optional fourth argument OUTPUT-BUFFER is non-nil,
2338 that says to put the output in some other buffer.
2339 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
2340 If OUTPUT-BUFFER is not a buffer and not nil,
2341 insert output in the current buffer.
2342 In either case, the output is inserted after point (leaving mark after it).
2344 If REPLACE, the optional fifth argument, is non-nil, that means insert
2345 the output in place of text from START to END, putting point and mark
2346 around it.
2348 If optional sixth argument ERROR-BUFFER is non-nil, it is a buffer
2349 or buffer name to which to direct the command's standard error output.
2350 If it is nil, error output is mingled with regular output.
2351 If DISPLAY-ERROR-BUFFER is non-nil, display the error buffer if there
2352 were any errors. (This is always t, interactively.)
2353 In an interactive call, the variable `shell-command-default-error-buffer'
2354 specifies the value of ERROR-BUFFER."
2358 ;; Do this before calling region-beginning
2359 ;; and region-end, in case subprocess output
2360 ;; relocates them while we are in the minibuffer.
2362 ;; call-interactively recognizes region-beginning and
2363 ;; region-end specially, leaving them in the history.
2365 string
2366 current-prefix-arg
2367 current-prefix-arg
2368 shell-command-default-error-buffer
2369 t)))
2375 temporary-file-directory)))
2376 nil))
2377 exit-status)
2381 ;; Replace specified region with output from command.
2383 ;; Don't muck with mark unless REPLACE says we should.
2390 t)
2391 nil shell-command-switch command))
2392 ;; It is rude to delete a buffer which the command is not using.
2393 ;; (let ((shell-buffer (get-buffer "*Shell Command Output*")))
2394 ;; (and shell-buffer (not (eq shell-buffer (current-buffer)))
2395 ;; (kill-buffer shell-buffer)))
2396 ;; Don't muck with mark unless REPLACE says we should.
2398 ;; No prefix argument: put the output in a temp buffer,
2399 ;; replacing its entire contents.
2404 ;; If the input is the same buffer as the output,
2405 ;; delete everything but the specified region,
2406 ;; then replace that region with the output.
2412 shell-file-name t
2415 t)
2416 nil shell-command-switch
2417 command)))
2418 ;; Clear the output buffer, then run the command with
2419 ;; output there.
2431 buffer)
2432 nil shell-command-switch command)))
2433 ;; Report the output.
2443 ;; There's some output, display it
2445 ;; No output; error?
2449 "some error output"
2455 output))
2458 exit-status))
2461 exit-status output))))
2462 ;; Don't kill: there might be useful info in the undo-log.
2463 ;; (kill-buffer buffer)
2464 ))))
2472 ;; Do no formatting while reading error file,
2473 ;; because that can run a shell command, and we
2474 ;; don't want that to cause an infinite recursion.
2476 ;; Put point after the inserted errors.
2481 exit-status))
2484 "Execute shell command COMMAND and return its output as a string."
2487 standard-output
2491 "Process files synchronously in a separate process.
2492 Similar to `call-process', but may invoke a file handler based on
2493 `default-directory'. The current working directory of the
2494 subprocess is `default-directory'.
2496 File names in INFILE and BUFFER are handled normally, but file
2497 names in ARGS should be relative to `default-directory', as they
2498 are passed to the process verbatim. \(This is a difference to
2499 `call-process' which does not support file handlers for INFILE
2500 and BUFFER.\)
2502 Some file handlers might not support all variants, for example
2503 they might behave as if DISPLAY was nil, regardless of the actual
2504 value passed."
2506 lc stderr-file)
2516 display args)
2522 "Whether a call of `process-file' changes remote files.
2524 Per default, this variable is always set to `t', meaning that a
2525 call of `process-file' could potentially change any file on a
2526 remote host. When set to `nil', a file handler could optimize
2527 its behaviour with respect to remote file attributes caching.
2529 This variable should never be changed by `setq'. Instead of, it
2533 "Start a program in a subprocess. Return the process object for it.
2535 Similar to `start-process', but may invoke a file handler based on
2536 `default-directory'. See Info node `(elisp)Magic File Names'.
2538 This handler ought to run PROGRAM, perhaps on the local host,
2539 perhaps on a remote host that corresponds to `default-directory'.
2540 In the latter case, the local part of `default-directory' becomes
2541 the working directory of the process.
2543 PROGRAM and PROGRAM-ARGS might be file names. They are not
2544 objects of file handler invocation."
2549 \f
2553 (define-key map (vector meta-prefix-char t) 'universal-argument-other-key)
2554 (define-key map [switch-frame] nil)
2555 (define-key map [?\C-u] 'universal-argument-more)
2556 (define-key map [?-] 'universal-argument-minus)
2557 (define-key map [?0] 'digit-argument)
2558 (define-key map [?1] 'digit-argument)
2559 (define-key map [?2] 'digit-argument)
2560 (define-key map [?3] 'digit-argument)
2561 (define-key map [?4] 'digit-argument)
2562 (define-key map [?5] 'digit-argument)
2563 (define-key map [?6] 'digit-argument)
2564 (define-key map [?7] 'digit-argument)
2565 (define-key map [?8] 'digit-argument)
2566 (define-key map [?9] 'digit-argument)
2567 (define-key map [kp-0] 'digit-argument)
2568 (define-key map [kp-1] 'digit-argument)
2569 (define-key map [kp-2] 'digit-argument)
2570 (define-key map [kp-3] 'digit-argument)
2571 (define-key map [kp-4] 'digit-argument)
2572 (define-key map [kp-5] 'digit-argument)
2573 (define-key map [kp-6] 'digit-argument)
2574 (define-key map [kp-7] 'digit-argument)
2575 (define-key map [kp-8] 'digit-argument)
2576 (define-key map [kp-9] 'digit-argument)
2577 (define-key map [kp-subtract] 'universal-argument-minus)
2578 map)
2581 (defvar universal-argument-num-events nil
2582 "Number of argument-specifying events read by `universal-argument'.
2583 `universal-argument-other-key' uses this to discard those events
2584 from (this-command-keys), and reread only the final command.")
2586 (defvar overriding-map-is-bound nil
2587 "Non-nil when `overriding-terminal-local-map' is `universal-argument-map'.")
2589 (defvar saved-overriding-map nil
2590 "The saved value of `overriding-terminal-local-map'.
2594 (defun ensure-overriding-map-is-bound ()
2595 "Check `overriding-terminal-local-map' is `universal-argument-map'."
2596 (unless overriding-map-is-bound
2597 (setq saved-overriding-map overriding-terminal-local-map)
2598 (setq overriding-terminal-local-map universal-argument-map)
2599 (setq overriding-map-is-bound t)))
2601 (defun restore-overriding-map ()
2602 "Restore `overriding-terminal-local-map' to its saved value."
2603 (setq overriding-terminal-local-map saved-overriding-map)
2604 (setq overriding-map-is-bound nil))
2606 (defun universal-argument ()
2607 "Begin a numeric argument for the following command.
2612 multiplies the argument by 4 each time.
2614 which is different in effect from any particular numeric argument.
2616 (interactive)
2617 (setq prefix-arg (list 4))
2618 (setq universal-argument-num-events (length (this-command-keys)))
2619 (ensure-overriding-map-is-bound))
2621 ;; A subsequent C-u means to multiply the factor by 4 if we've typed
2622 ;; nothing but C-u's; otherwise it means to terminate the prefix arg.
2623 (defun universal-argument-more (arg)
2624 (interactive "P")
2625 (if (consp arg)
2626 (setq prefix-arg (list (* 4 (car arg))))
2627 (if (eq arg '-)
2628 (setq prefix-arg (list -4))
2629 (setq prefix-arg arg)
2630 (restore-overriding-map)))
2631 (setq universal-argument-num-events (length (this-command-keys))))
2633 (defun negative-argument (arg)
2634 "Begin a negative numeric argument for the next command.
2636 (interactive "P")
2637 (cond ((integerp arg)
2638 (setq prefix-arg (- arg)))
2639 ((eq arg '-)
2640 (setq prefix-arg nil))
2641 (t
2642 (setq prefix-arg '-)))
2643 (setq universal-argument-num-events (length (this-command-keys)))
2644 (ensure-overriding-map-is-bound))
2646 (defun digit-argument (arg)
2647 "Part of the numeric argument for the next command.
2649 (interactive "P")
2650 (let* ((char (if (integerp last-command-event)
2651 last-command-event
2652 (get last-command-event 'ascii-character)))
2654 (cond ((integerp arg)
2655 (setq prefix-arg (+ (* arg 10)
2656 (if (< arg 0) (- digit) digit))))
2657 ((eq arg '-)
2658 ;; Treat -0 as just -, so that -01 will work.
2659 (setq prefix-arg (if (zerop digit) '- (- digit))))
2660 (t
2661 (setq prefix-arg digit))))
2662 (setq universal-argument-num-events (length (this-command-keys)))
2663 (ensure-overriding-map-is-bound))
2665 ;; For backward compatibility, minus with no modifiers is an ordinary
2666 ;; command if digits have already been entered.
2667 (defun universal-argument-minus (arg)
2668 (interactive "P")
2669 (if (integerp arg)
2670 (universal-argument-other-key arg)
2671 (negative-argument arg)))
2673 ;; Anything else terminates the argument and is left in the queue to be
2674 ;; executed as a command.
2675 (defun universal-argument-other-key (arg)
2676 (interactive "P")
2677 (setq prefix-arg arg)
2678 (let* ((key (this-command-keys))
2679 (keylist (listify-key-sequence key)))
2680 (setq unread-command-events
2681 (append (nthcdr universal-argument-num-events keylist)
2682 unread-command-events)))
2683 (reset-this-command-lengths)
2684 (restore-overriding-map))
2685 \f
2686 (defvar buffer-substring-filters nil
2687 "List of filter functions for `filter-buffer-substring'.
2688 Each function must accept a single argument, a string, and return
2689 a string. The buffer substring is passed to the first function
2690 in the list, and the return value of each function is passed to
2691 the next. The return value of the last function is used as the
2692 return value of `filter-buffer-substring'.
2694 If this variable is nil, no filtering is performed.")
2696 (defun filter-buffer-substring (beg end &optional delete noprops)
2697 "Return the buffer substring between BEG and END, after filtering.
2698 The buffer substring is passed through each of the filter
2699 functions in `buffer-substring-filters', and the value from the
2700 last filter function is returned. If `buffer-substring-filters'
2701 is nil, the buffer substring is returned unaltered.
2703 If DELETE is non-nil, the text between BEG and END is deleted
2704 from the buffer.
2706 If NOPROPS is non-nil, final string returned does not include
2707 text properties, while the string passed to the filters still
2708 includes text properties from the buffer text.
2710 Point is temporarily set to BEG before calling
2711 `buffer-substring-filters', in case the functions need to know
2712 where the text came from.
2714 This function should be used instead of `buffer-substring',
2715 `buffer-substring-no-properties', or `delete-and-extract-region'
2716 when you want to allow filtering to take place. For example,
2717 major or minor modes can use `buffer-substring-filters' to
2718 extract characters that are special to a buffer, and should not
2719 be copied into other buffers."
2720 (cond
2721 ((or delete buffer-substring-filters)
2722 (save-excursion
2723 (goto-char beg)
2724 (let ((string (if delete (delete-and-extract-region beg end)
2725 (buffer-substring beg end))))
2726 (dolist (filter buffer-substring-filters)
2727 (setq string (funcall filter string)))
2728 (if noprops
2729 (set-text-properties 0 (length string) nil string))
2730 string)))
2731 (noprops
2732 (buffer-substring-no-properties beg end))
2733 (t
2734 (buffer-substring beg end))))
2737 ;;;; Window system cut and paste hooks.
2739 (defvar interprogram-cut-function nil
2740 "Function to call to make a killed region available to other programs.
2742 Most window systems provide some sort of facility for cutting and
2743 pasting text between the windows of different programs.
2744 This variable holds a function that Emacs calls whenever text
2745 is put in the kill ring, to make the new kill available to other
2746 programs.
2748 The function takes one or two arguments.
2749 The first argument, TEXT, is a string containing
2750 the text which should be made available.
2751 The second, optional, argument PUSH, has the same meaning as the
2752 similar argument to `x-set-cut-buffer', which see.")
2754 (defvar interprogram-paste-function nil
2755 "Function to call to get text cut from other programs.
2757 Most window systems provide some sort of facility for cutting and
2758 pasting text between the windows of different programs.
2759 This variable holds a function that Emacs calls to obtain
2760 text that other programs have provided for pasting.
2762 The function should be called with no arguments. If the function
2763 returns nil, then no other program has provided such text, and the top
2764 of the Emacs kill ring should be used. If the function returns a
2765 string, then the caller of the function \(usually `current-kill')
2766 should put this string in the kill ring as the latest kill.
2768 This function may also return a list of strings if the window
2769 system supports multiple selections. The first string will be
2770 used as the pasted text, but the other will be placed in the
2771 kill ring for easy access via `yank-pop'.
2773 Note that the function should return a string only if a program other
2774 than Emacs has provided a string for pasting; if Emacs provided the
2775 most recent string, the function should return nil. If it is
2776 difficult to tell whether Emacs or some other program provided the
2777 current string, it is probably good enough to return nil if the string
2778 is equal (according to `string=') to the last text Emacs provided.")
2779 \f
2782 ;;;; The kill ring data structure.
2784 (defvar kill-ring nil
2785 "List of killed text sequences.
2786 Since the kill ring is supposed to interact nicely with cut-and-paste
2787 facilities offered by window systems, use of this variable should
2788 interact nicely with `interprogram-cut-function' and
2789 `interprogram-paste-function'. The functions `kill-new',
2790 `kill-append', and `current-kill' are supposed to implement this
2791 interaction; you may want to use them instead of manipulating the kill
2792 ring directly.")
2794 (defcustom kill-ring-max 60
2795 "Maximum length of kill ring before oldest elements are thrown away."
2796 :type 'integer
2797 :group 'killing)
2799 (defvar kill-ring-yank-pointer nil
2800 "The tail of the kill ring whose car is the last thing yanked.")
2802 (defcustom save-interprogram-paste-before-kill nil
2803 "Save the paste strings into `kill-ring' before replacing it with emacs strings.
2804 When one selects something in another program to paste it into Emacs,
2805 but kills something in Emacs before actually pasting it,
2806 this selection is gone unless this variable is non-nil,
2807 in which case the other program's selection is saved in the `kill-ring'
2809 :type 'boolean
2810 :group 'killing
2811 :version "23.2")
2813 (defcustom kill-do-not-save-duplicates nil
2814 "Do not add a new string to `kill-ring' when it is the same as the last one."
2815 :type 'boolean
2816 :group 'killing
2817 :version "23.2")
2819 (defun kill-new (string &optional replace yank-handler)
2820 "Make STRING the latest kill in the kill ring.
2821 Set `kill-ring-yank-pointer' to point to it.
2822 If `interprogram-cut-function' is non-nil, apply it to STRING.
2823 Optional second argument REPLACE non-nil means that STRING will replace
2824 the front of the kill ring, rather than being added to the list.
2826 Optional third arguments YANK-HANDLER controls how the STRING is later
2827 inserted into a buffer; see `insert-for-yank' for details.
2828 When a yank handler is specified, STRING must be non-empty (the yank
2829 handler, if non-nil, is stored as a `yank-handler' text property on STRING).
2831 When `save-interprogram-paste-before-kill' and `interprogram-paste-function'
2832 are non-nil, saves the interprogram paste string(s) into `kill-ring' before
2833 STRING.
2835 When the yank handler has a non-nil PARAM element, the original STRING
2836 argument is not used by `insert-for-yank'. However, since Lisp code
2837 may access and use elements from the kill ring directly, the STRING
2839 (if (> (length string) 0)
2840 (if yank-handler
2841 (put-text-property 0 (length string)
2842 'yank-handler yank-handler string))
2843 (if yank-handler
2844 (signal 'args-out-of-range
2845 (list string "yank-handler specified for empty string"))))
2846 (when (and kill-do-not-save-duplicates
2847 (equal string (car kill-ring)))
2848 (setq replace t))
2849 (if (fboundp 'menu-bar-update-yank-menu)
2850 (menu-bar-update-yank-menu string (and replace (car kill-ring))))
2851 (when save-interprogram-paste-before-kill
2852 (let ((interprogram-paste (and interprogram-paste-function
2853 (funcall interprogram-paste-function))))
2854 (when interprogram-paste
2855 (if (listp interprogram-paste)
2856 (dolist (s (nreverse interprogram-paste))
2857 (push s kill-ring))
2858 (push interprogram-paste kill-ring)))))
2859 (if (and replace kill-ring)
2860 (setcar kill-ring string)
2861 (push string kill-ring)
2862 (if (> (length kill-ring) kill-ring-max)
2863 (setcdr (nthcdr (1- kill-ring-max) kill-ring) nil)))
2864 (setq kill-ring-yank-pointer kill-ring)
2865 (if interprogram-cut-function
2866 (funcall interprogram-cut-function string (not replace))))
2868 (defun kill-append (string before-p &optional yank-handler)
2869 "Append STRING to the end of the latest kill in the kill ring.
2870 If BEFORE-P is non-nil, prepend STRING to the kill.
2871 Optional third argument YANK-HANDLER, if non-nil, specifies the
2872 yank-handler text property to be set on the combined kill ring
2873 string. If the specified yank-handler arg differs from the
2874 yank-handler property of the latest kill string, this function
2875 adds the combined string to the kill ring as a new element,
2876 instead of replacing the last kill with it.
2877 If `interprogram-cut-function' is set, pass the resulting kill to it."
2878 (let* ((cur (car kill-ring)))
2879 (kill-new (if before-p (concat string cur) (concat cur string))
2880 (or (= (length cur) 0)
2881 (equal yank-handler (get-text-property 0 'yank-handler cur)))
2882 yank-handler)))
2884 (defcustom yank-pop-change-selection nil
2885 "If non-nil, rotating the kill ring changes the window system selection."
2886 :type 'boolean
2887 :group 'killing
2888 :version "23.1")
2890 (defun current-kill (n &optional do-not-move)
2891 "Rotate the yanking point by N places, and then return that kill.
2892 If N is zero, `interprogram-paste-function' is set, and calling
2893 it returns a string or list of strings, then that string (or
2894 list) is added to the front of the kill ring and the string (or
2895 first string in the list) is returned as the latest kill.
2897 If N is not zero, and if `yank-pop-change-selection' is
2898 non-nil, use `interprogram-cut-function' to transfer the
2899 kill at the new yank point into the window system selection.
2901 If optional arg DO-NOT-MOVE is non-nil, then don't actually
2902 move the yanking point; just return the Nth kill forward."
2904 (let ((interprogram-paste (and (= n 0)
2905 interprogram-paste-function
2906 (funcall interprogram-paste-function))))
2907 (if interprogram-paste
2908 (progn
2909 ;; Disable the interprogram cut function when we add the new
2910 ;; text to the kill ring, so Emacs doesn't try to own the
2911 ;; selection, with identical text.
2912 (let ((interprogram-cut-function nil))
2913 (if (listp interprogram-paste)
2914 (mapc 'kill-new (nreverse interprogram-paste))
2915 (kill-new interprogram-paste)))
2916 (car kill-ring))
2917 (or kill-ring (error "Kill ring is empty"))
2918 (let ((ARGth-kill-element
2919 (nthcdr (mod (- n (length kill-ring-yank-pointer))
2920 (length kill-ring))
2921 kill-ring)))
2922 (unless do-not-move
2923 (setq kill-ring-yank-pointer ARGth-kill-element)
2924 (when (and yank-pop-change-selection
2925 (> n 0)
2926 interprogram-cut-function)
2927 (funcall interprogram-cut-function (car ARGth-kill-element))))
2928 (car ARGth-kill-element)))))
2932 ;;;; Commands for manipulating the kill ring.
2934 (defcustom kill-read-only-ok nil
2935 "Non-nil means don't signal an error for killing read-only text."
2936 :type 'boolean
2937 :group 'killing)
2939 (put 'text-read-only 'error-conditions
2940 '(text-read-only buffer-read-only error))
2941 (put 'text-read-only 'error-message "Text is read-only")
2943 (defun kill-region (beg end &optional yank-handler)
2945 This deletes the text from the buffer and saves it in the kill ring.
2949 If you want to append the killed region to the last killed text,
2952 If the buffer is read-only, Emacs will beep and refrain from deleting
2953 the text, but put the text in the kill ring anyway. This means that
2954 you can use the killing commands to copy text from a read-only buffer.
2956 This is the primitive for programs to kill text (as opposed to deleting it).
2957 Supply two arguments, character positions indicating the stretch of text
2958 to be killed.
2960 If the previous command was also a kill command,
2961 the text killed this time appends to the text killed last time
2962 to make one entry in the kill ring.
2964 In Lisp code, optional third arg YANK-HANDLER, if non-nil,
2965 specifies the yank-handler text property to be set on the killed
2966 text. See `insert-for-yank'."
2967 ;; Pass point first, then mark, because the order matters
2968 ;; when calling kill-append.
2969 (interactive (list (point) (mark)))
2970 (unless (and beg end)
2971 (error "The mark is not set now, so there is no region"))
2972 (condition-case nil
2973 (let ((string (filter-buffer-substring beg end t)))
2974 (when string ;STRING is nil if BEG = END
2975 ;; Add that string to the kill ring, one way or another.
2976 (if (eq last-command 'kill-region)
2977 (kill-append string (< end beg) yank-handler)
2978 (kill-new string nil yank-handler)))
2979 (when (or string (eq last-command 'kill-region))
2980 (setq this-command 'kill-region))
2981 nil)
2982 ((buffer-read-only text-read-only)
2983 ;; The code above failed because the buffer, or some of the characters
2984 ;; in the region, are read-only.
2985 ;; We should beep, in case the user just isn't aware of this.
2986 ;; However, there's no harm in putting
2987 ;; the region's text in the kill ring, anyway.
2988 (copy-region-as-kill beg end)
2989 ;; Set this-command now, so it will be set even if we get an error.
2990 (setq this-command 'kill-region)
2991 ;; This should barf, if appropriate, and give us the correct error.
2992 (if kill-read-only-ok
2993 (progn (message "Read only text copied to kill ring") nil)
2994 ;; Signal an error if the buffer is read-only.
2995 (barf-if-buffer-read-only)
2996 ;; If the buffer isn't read-only, the text is.
2997 (signal 'text-read-only (list (current-buffer)))))))
2999 ;; copy-region-as-kill no longer sets this-command, because it's confusing
3000 ;; to get two copies of the text when the user accidentally types M-w and
3001 ;; then corrects it with the intended C-w.
3002 (defun copy-region-as-kill (beg end)
3003 "Save the region as if killed, but don't kill it.
3004 In Transient Mark mode, deactivate the mark.
3005 If `interprogram-cut-function' is non-nil, also save the text for a window
3006 system cut and paste.
3008 This command's old key binding has been given to `kill-ring-save'."
3009 (interactive "r")
3010 (if (eq last-command 'kill-region)
3011 (kill-append (filter-buffer-substring beg end) (< end beg))
3012 (kill-new (filter-buffer-substring beg end)))
3013 (setq deactivate-mark t)
3014 nil)
3016 (defun kill-ring-save (beg end)
3017 "Save the region as if killed, but don't kill it.
3018 In Transient Mark mode, deactivate the mark.
3019 If `interprogram-cut-function' is non-nil, also save the text for a window
3020 system cut and paste.
3022 If you want to append the killed line to the last killed text,
3025 This command is similar to `copy-region-as-kill', except that it gives
3026 visual feedback indicating the extent of the region being copied."
3027 (interactive "r")
3028 (copy-region-as-kill beg end)
3029 ;; This use of called-interactively-p is correct
3030 ;; because the code it controls just gives the user visual feedback.
3031 (if (called-interactively-p 'interactive)
3032 (let ((other-end (if (= (point) beg) end beg))
3033 (opoint (point))
3034 ;; Inhibit quitting so we can make a quit here
3035 ;; look like a C-g typed as a command.
3036 (inhibit-quit t))
3037 (if (pos-visible-in-window-p other-end (selected-window))
3038 ;; Swap point-and-mark quickly so as to show the region that
3039 ;; was selected. Don't do it if the region is highlighted.
3040 (unless (and (region-active-p)
3041 (face-background 'region))
3042 ;; Swap point and mark.
3043 (set-marker (mark-marker) (point) (current-buffer))
3044 (goto-char other-end)
3045 (sit-for blink-matching-delay)
3046 ;; Swap back.
3047 (set-marker (mark-marker) other-end (current-buffer))
3048 (goto-char opoint)
3049 ;; If user quit, deactivate the mark
3050 ;; as C-g would as a command.
3051 (and quit-flag mark-active
3052 (deactivate-mark)))
3053 (let* ((killed-text (current-kill 0))
3054 (message-len (min (length killed-text) 40)))
3055 (if (= (point) beg)
3056 ;; Don't say "killed"; that is misleading.
3058 (substring killed-text (- message-len)))
3060 (substring killed-text 0 message-len))))))))
3062 (defun append-next-kill (&optional interactive)
3063 "Cause following command, if it kills, to append to previous kill.
3064 The argument is used for internal purposes; do not supply one."
3065 (interactive "p")
3066 ;; We don't use (interactive-p), since that breaks kbd macros.
3067 (if interactive
3068 (progn
3069 (setq this-command 'kill-region)
3070 (message "If the next command is a kill, it will append"))
3071 (setq last-command 'kill-region)))
3072 \f
3073 ;; Yanking.
3075 ;; This is actually used in subr.el but defcustom does not work there.
3076 (defcustom yank-excluded-properties
3077 '(read-only invisible intangible field mouse-face help-echo local-map keymap
3078 yank-handler follow-link fontified)
3079 "Text properties to discard when yanking.
3080 The value should be a list of text properties to discard or t,
3081 which means to discard all text properties."
3082 :type '(choice (const :tag "All" t) (repeat symbol))
3083 :group 'killing
3084 :version "22.1")
3086 (defvar yank-window-start nil)
3087 (defvar yank-undo-function nil
3088 "If non-nil, function used by `yank-pop' to delete last stretch of yanked text.
3089 Function is called with two parameters, START and END corresponding to
3090 the value of the mark and point; it is guaranteed that START <= END.
3091 Normally set from the UNDO element of a yank-handler; see `insert-for-yank'.")
3093 (defun yank-pop (&optional arg)
3094 "Replace just-yanked stretch of killed text with a different stretch.
3095 This command is allowed only immediately after a `yank' or a `yank-pop'.
3096 At such a time, the region contains a stretch of reinserted
3097 previously-killed text. `yank-pop' deletes that text and inserts in its
3098 place a different stretch of killed text.
3100 With no argument, the previous kill is inserted.
3101 With argument N, insert the Nth previous kill.
3102 If N is negative, this is a more recent kill.
3104 The sequence of kills wraps around, so that after the oldest one
3105 comes the newest one.
3107 When this command inserts killed text into the buffer, it honors
3108 `yank-excluded-properties' and `yank-handler' as described in the
3109 doc string for `insert-for-yank-1', which see."
3110 (interactive "*p")
3111 (if (not (eq last-command 'yank))
3112 (error "Previous command was not a yank"))
3113 (setq this-command 'yank)
3114 (unless arg (setq arg 1))
3115 (let ((inhibit-read-only t)
3116 (before (< (point) (mark t))))
3117 (if before
3118 (funcall (or yank-undo-function 'delete-region) (point) (mark t))
3119 (funcall (or yank-undo-function 'delete-region) (mark t) (point)))
3120 (setq yank-undo-function nil)
3121 (set-marker (mark-marker) (point) (current-buffer))
3122 (insert-for-yank (current-kill arg))
3123 ;; Set the window start back where it was in the yank command,
3124 ;; if possible.
3125 (set-window-start (selected-window) yank-window-start t)
3126 (if before
3127 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
3128 ;; It is cleaner to avoid activation, even though the command
3129 ;; loop would deactivate the mark because we inserted text.
3130 (goto-char (prog1 (mark t)
3131 (set-marker (mark-marker) (point) (current-buffer))))))
3132 nil)
3134 (defun yank (&optional arg)
3136 More precisely, reinsert the stretch of killed text most recently
3137 killed OR yanked. Put point at end, and set mark at beginning.
3138 With just \\[universal-argument] as argument, same but put point at beginning (and mark at end).
3139 With argument N, reinsert the Nth most recently killed stretch of killed
3140 text.
3142 When this command inserts killed text into the buffer, it honors
3143 `yank-excluded-properties' and `yank-handler' as described in the
3144 doc string for `insert-for-yank-1', which see.
3147 (interactive "*P")
3148 (setq yank-window-start (window-start))
3149 ;; If we don't get all the way thru, make last-command indicate that
3150 ;; for the following command.
3151 (setq this-command t)
3152 (push-mark (point))
3153 (insert-for-yank (current-kill (cond
3154 ((listp arg) 0)
3155 ((eq arg '-) -2)
3156 (t (1- arg)))))
3157 (if (consp arg)
3158 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
3159 ;; It is cleaner to avoid activation, even though the command
3160 ;; loop would deactivate the mark because we inserted text.
3161 (goto-char (prog1 (mark t)
3162 (set-marker (mark-marker) (point) (current-buffer)))))
3163 ;; If we do get all the way thru, make this-command indicate that.
3164 (if (eq this-command t)
3165 (setq this-command 'yank))
3166 nil)
3168 (defun rotate-yank-pointer (arg)
3169 "Rotate the yanking point in the kill ring.
3170 With ARG, rotate that many kills forward (or backward, if negative)."
3171 (interactive "p")
3172 (current-kill arg))
3173 \f
3174 ;; Some kill commands.
3176 ;; Internal subroutine of delete-char
3177 (defun kill-forward-chars (arg)
3178 (if (listp arg) (setq arg (car arg)))
3179 (if (eq arg '-) (setq arg -1))
3180 (kill-region (point) (+ (point) arg)))
3182 ;; Internal subroutine of backward-delete-char
3183 (defun kill-backward-chars (arg)
3184 (if (listp arg) (setq arg (car arg)))
3185 (if (eq arg '-) (setq arg -1))
3186 (kill-region (point) (- (point) arg)))
3188 (defcustom backward-delete-char-untabify-method 'untabify
3189 "The method for untabifying when deleting backward.
3190 Can be `untabify' -- turn a tab to many spaces, then delete one space;
3191 `hungry' -- delete all whitespace, both tabs and spaces;
3192 `all' -- delete all whitespace, including tabs, spaces and newlines;
3193 nil -- just delete one character."
3194 :type '(choice (const untabify) (const hungry) (const all) (const nil))
3195 :version "20.3"
3196 :group 'killing)
3198 (defun backward-delete-char-untabify (arg &optional killp)
3199 "Delete characters backward, changing tabs into spaces.
3200 The exact behavior depends on `backward-delete-char-untabify-method'.
3201 Delete ARG chars, and kill (save in kill ring) if KILLP is non-nil.
3202 Interactively, ARG is the prefix arg (default 1)
3203 and KILLP is t if a prefix arg was specified."
3205 (when (eq backward-delete-char-untabify-method 'untabify)
3206 (let ((count arg))
3207 (save-excursion
3208 (while (and (> count 0) (not (bobp)))
3210 (let ((col (current-column)))
3211 (forward-char -1)
3212 (setq col (- col (current-column)))
3213 (insert-char ?\s col)
3214 (delete-char 1)))
3215 (forward-char -1)
3216 (setq count (1- count))))))
3217 (delete-backward-char
3219 ((eq backward-delete-char-untabify-method 'all)
3221 (if skip
3222 (let ((wh (- (point) (save-excursion (skip-chars-backward skip)
3223 (point)))))
3224 (+ arg (if (zerop wh) 0 (1- wh))))
3225 arg))
3226 killp))
3228 (defun zap-to-char (arg char)
3229 "Kill up to and including ARGth occurrence of CHAR.
3230 Case is ignored if `case-fold-search' is non-nil in the current buffer.
3231 Goes backward if ARG is negative; error if CHAR not found."
3233 ;; Avoid "obsolete" warnings for translation-table-for-input.
3234 (with-no-warnings
3235 (if (char-table-p translation-table-for-input)
3236 (setq char (or (aref translation-table-for-input char) char))))
3237 (kill-region (point) (progn
3238 (search-forward (char-to-string char) nil nil arg)
3239 ; (goto-char (if (> arg 0) (1- (point)) (1+ (point))))
3240 (point))))
3242 ;; kill-line and its subroutines.
3244 (defcustom kill-whole-line nil
3245 "If non-nil, `kill-line' with no arg at beg of line kills the whole line."
3246 :type 'boolean
3247 :group 'killing)
3249 (defun kill-line (&optional arg)
3250 "Kill the rest of the current line; if no nonblanks there, kill thru newline.
3251 With prefix argument ARG, kill that many lines from point.
3252 Negative arguments kill lines backward.
3253 With zero argument, kills the text before point on the current line.
3256 a number counts as a prefix arg.
3258 To kill a whole line, when point is not at the beginning, type \
3261 If `kill-whole-line' is non-nil, then this command kills the whole line
3262 including its terminating newline, when used at the beginning of a line
3263 with no argument. As a consequence, you can always kill a whole line
3266 If you want to append the killed line to the last killed text,
3269 If the buffer is read-only, Emacs will beep and refrain from deleting
3270 the line, but put the line in the kill ring anyway. This means that
3271 you can use this command to copy text from a read-only buffer.
3272 \(If the variable `kill-read-only-ok' is non-nil, then this won't
3273 even beep.)"
3274 (interactive "P")
3275 (kill-region (point)
3276 ;; It is better to move point to the other end of the kill
3277 ;; before killing. That way, in a read-only buffer, point
3278 ;; moves across the text that is copied to the kill ring.
3279 ;; The choice has no effect on undo now that undo records
3280 ;; the value of point from before the command was run.
3281 (progn
3282 (if arg
3283 (forward-visible-line (prefix-numeric-value arg))
3284 (if (eobp)
3285 (signal 'end-of-buffer nil))
3286 (let ((end
3287 (save-excursion
3288 (end-of-visible-line) (point))))
3289 (if (or (save-excursion
3290 ;; If trailing whitespace is visible,
3291 ;; don't treat it as nothing.
3292 (unless show-trailing-whitespace
3294 (= (point) end))
3295 (and kill-whole-line (bolp)))
3296 (forward-visible-line 1)
3297 (goto-char end))))
3298 (point))))
3300 (defun kill-whole-line (&optional arg)
3301 "Kill current line.
3302 With prefix ARG, kill that many lines starting from the current line.
3303 If ARG is negative, kill backward. Also kill the preceding newline.
3305 If ARG is zero, kill current line but exclude the trailing newline."
3306 (interactive "p")
3307 (or arg (setq arg 1))
3308 (if (and (> arg 0) (eobp) (save-excursion (forward-visible-line 0) (eobp)))
3309 (signal 'end-of-buffer nil))
3310 (if (and (< arg 0) (bobp) (save-excursion (end-of-visible-line) (bobp)))
3311 (signal 'beginning-of-buffer nil))
3312 (unless (eq last-command 'kill-region)
3313 (kill-new "")
3314 (setq last-command 'kill-region))
3315 (cond ((zerop arg)
3316 ;; We need to kill in two steps, because the previous command
3317 ;; could have been a kill command, in which case the text
3318 ;; before point needs to be prepended to the current kill
3319 ;; ring entry and the text after point appended. Also, we
3320 ;; need to use save-excursion to avoid copying the same text
3321 ;; twice to the kill ring in read-only buffers.
3322 (save-excursion
3323 (kill-region (point) (progn (forward-visible-line 0) (point))))
3324 (kill-region (point) (progn (end-of-visible-line) (point))))
3325 ((< arg 0)
3326 (save-excursion
3327 (kill-region (point) (progn (end-of-visible-line) (point))))
3328 (kill-region (point)
3329 (progn (forward-visible-line (1+ arg))
3330 (unless (bobp) (backward-char))
3331 (point))))
3332 (t
3333 (save-excursion
3334 (kill-region (point) (progn (forward-visible-line 0) (point))))
3335 (kill-region (point)
3336 (progn (forward-visible-line arg) (point))))))
3338 (defun forward-visible-line (arg)
3339 "Move forward by ARG lines, ignoring currently invisible newlines only.
3340 If ARG is negative, move backward -ARG lines.
3341 If ARG is zero, move to the beginning of the current line."
3342 (condition-case nil
3343 (if (> arg 0)
3344 (progn
3345 (while (> arg 0)
3346 (or (zerop (forward-line 1))
3347 (signal 'end-of-buffer nil))
3348 ;; If the newline we just skipped is invisible,
3349 ;; don't count it.
3350 (let ((prop
3351 (get-char-property (1- (point)) 'invisible)))
3352 (if (if (eq buffer-invisibility-spec t)
3353 prop
3354 (or (memq prop buffer-invisibility-spec)
3355 (assq prop buffer-invisibility-spec)))
3356 (setq arg (1+ arg))))
3357 (setq arg (1- arg)))
3358 ;; If invisible text follows, and it is a number of complete lines,
3359 ;; skip it.
3360 (let ((opoint (point)))
3361 (while (and (not (eobp))
3362 (let ((prop
3363 (get-char-property (point) 'invisible)))
3364 (if (eq buffer-invisibility-spec t)
3365 prop
3366 (or (memq prop buffer-invisibility-spec)
3367 (assq prop buffer-invisibility-spec)))))
3368 (goto-char
3369 (if (get-text-property (point) 'invisible)
3370 (or (next-single-property-change (point) 'invisible)
3371 (point-max))
3372 (next-overlay-change (point)))))
3373 (unless (bolp)
3374 (goto-char opoint))))
3375 (let ((first t))
3376 (while (or first (<= arg 0))
3377 (if first
3378 (beginning-of-line)
3379 (or (zerop (forward-line -1))
3380 (signal 'beginning-of-buffer nil)))
3381 ;; If the newline we just moved to is invisible,
3382 ;; don't count it.
3383 (unless (bobp)
3384 (let ((prop
3385 (get-char-property (1- (point)) 'invisible)))
3386 (unless (if (eq buffer-invisibility-spec t)
3387 prop
3388 (or (memq prop buffer-invisibility-spec)
3389 (assq prop buffer-invisibility-spec)))
3390 (setq arg (1+ arg)))))
3391 (setq first nil))
3392 ;; If invisible text follows, and it is a number of complete lines,
3393 ;; skip it.
3394 (let ((opoint (point)))
3395 (while (and (not (bobp))
3396 (let ((prop
3397 (get-char-property (1- (point)) 'invisible)))
3398 (if (eq buffer-invisibility-spec t)
3399 prop
3400 (or (memq prop buffer-invisibility-spec)
3401 (assq prop buffer-invisibility-spec)))))
3402 (goto-char
3403 (if (get-text-property (1- (point)) 'invisible)
3404 (or (previous-single-property-change (point) 'invisible)
3405 (point-min))
3406 (previous-overlay-change (point)))))
3407 (unless (bolp)
3408 (goto-char opoint)))))
3409 ((beginning-of-buffer end-of-buffer)
3410 nil)))
3412 (defun end-of-visible-line ()
3413 "Move to end of current visible line."
3414 (end-of-line)
3415 ;; If the following character is currently invisible,
3416 ;; skip all characters with that same `invisible' property value,
3417 ;; then find the next newline.
3418 (while (and (not (eobp))
3419 (save-excursion
3421 (let ((prop
3422 (get-char-property (point) 'invisible)))
3423 (if (eq buffer-invisibility-spec t)
3424 prop
3425 (or (memq prop buffer-invisibility-spec)
3426 (assq prop buffer-invisibility-spec))))))
3428 (if (get-text-property (point) 'invisible)
3429 (goto-char (next-single-property-change (point) 'invisible))
3430 (goto-char (next-overlay-change (point))))
3431 (end-of-line)))
3432 \f
3433 (defun insert-buffer (buffer)
3434 "Insert after point the contents of BUFFER.
3435 Puts mark after the inserted text.
3436 BUFFER may be a buffer or a buffer name.
3438 This function is meant for the user to run interactively.
3439 Don't call it from programs: use `insert-buffer-substring' instead!"
3440 (interactive
3441 (list
3442 (progn
3443 (barf-if-buffer-read-only)
3444 (read-buffer "Insert buffer: "
3445 (if (eq (selected-window) (next-window (selected-window)))
3446 (other-buffer (current-buffer))
3447 (window-buffer (next-window (selected-window))))
3448 t))))
3449 (push-mark
3450 (save-excursion
3451 (insert-buffer-substring (get-buffer buffer))
3452 (point)))
3453 nil)
3455 (defun append-to-buffer (buffer start end)
3456 "Append to specified buffer the text of the region.
3457 It is inserted into that buffer before its point.
3459 When calling from a program, give three arguments:
3460 BUFFER (or buffer name), START and END.
3461 START and END specify the portion of the current buffer to be copied."
3462 (interactive
3463 (list (read-buffer "Append to buffer: " (other-buffer (current-buffer) t))
3464 (region-beginning) (region-end)))
3465 (let ((oldbuf (current-buffer)))
3466 (save-excursion
3467 (let* ((append-to (get-buffer-create buffer))
3468 (windows (get-buffer-window-list append-to t t))
3469 point)
3470 (set-buffer append-to)
3471 (setq point (point))
3472 (barf-if-buffer-read-only)
3473 (insert-buffer-substring oldbuf start end)
3474 (dolist (window windows)
3475 (when (= (window-point window) point)
3476 (set-window-point window (point))))))))
3478 (defun prepend-to-buffer (buffer start end)
3479 "Prepend to specified buffer the text of the region.
3480 It is inserted into that buffer after its point.
3482 When calling from a program, give three arguments:
3483 BUFFER (or buffer name), START and END.
3484 START and END specify the portion of the current buffer to be copied."
3486 (let ((oldbuf (current-buffer)))
3487 (save-excursion
3488 (set-buffer (get-buffer-create buffer))
3489 (barf-if-buffer-read-only)
3490 (save-excursion
3491 (insert-buffer-substring oldbuf start end)))))
3493 (defun copy-to-buffer (buffer start end)
3494 "Copy to specified buffer the text of the region.
3495 It is inserted into that buffer, replacing existing text there.
3497 When calling from a program, give three arguments:
3498 BUFFER (or buffer name), START and END.
3499 START and END specify the portion of the current buffer to be copied."
3501 (let ((oldbuf (current-buffer)))
3502 (with-current-buffer (get-buffer-create buffer)
3503 (barf-if-buffer-read-only)
3504 (erase-buffer)
3505 (save-excursion
3506 (insert-buffer-substring oldbuf start end)))))
3507 \f
3508 (put 'mark-inactive 'error-conditions '(mark-inactive error))
3509 (put 'mark-inactive 'error-message "The mark is not active now")
3511 (defvar activate-mark-hook nil
3512 "Hook run when the mark becomes active.
3513 It is also run at the end of a command, if the mark is active and
3514 it is possible that the region may have changed.")
3516 (defvar deactivate-mark-hook nil
3517 "Hook run when the mark becomes inactive.")
3519 (defun mark (&optional force)
3520 "Return this buffer's mark value as integer, or nil if never set.
3522 In Transient Mark mode, this function signals an error if
3523 the mark is not active. However, if `mark-even-if-inactive' is non-nil,
3524 or the argument FORCE is non-nil, it disregards whether the mark
3525 is active, and returns an integer or nil in the usual way.
3527 If you are using this in an editing command, you are most likely making
3528 a mistake; see the documentation of `set-mark'."
3529 (if (or force (not transient-mark-mode) mark-active mark-even-if-inactive)
3530 (marker-position (mark-marker))
3531 (signal 'mark-inactive nil)))
3533 (defcustom select-active-regions nil
3534 "If non-nil, an active region automatically becomes the window selection."
3535 :type 'boolean
3536 :group 'killing
3537 :version "23.1")
3539 ;; Many places set mark-active directly, and several of them failed to also
3540 ;; run deactivate-mark-hook. This shorthand should simplify.
3541 (defsubst deactivate-mark (&optional force)
3542 "Deactivate the mark by setting `mark-active' to nil.
3543 Unless FORCE is non-nil, this function does nothing if Transient
3544 Mark mode is disabled.
3545 This function also runs `deactivate-mark-hook'."
3546 (when (or transient-mark-mode force)
3547 ;; Copy the latest region into the primary selection, if desired.
3548 (and select-active-regions
3549 mark-active
3550 (display-selections-p)
3551 (x-selection-owner-p 'PRIMARY)
3552 (x-set-selection 'PRIMARY (buffer-substring-no-properties
3553 (region-beginning) (region-end))))
3554 (if (and (null force)
3555 (or (eq transient-mark-mode 'lambda)
3556 (and (eq (car-safe transient-mark-mode) 'only)
3557 (null (cdr transient-mark-mode)))))
3558 ;; When deactivating a temporary region, don't change
3559 ;; `mark-active' or run `deactivate-mark-hook'.
3560 (setq transient-mark-mode nil)
3561 (if (eq (car-safe transient-mark-mode) 'only)
3562 (setq transient-mark-mode (cdr transient-mark-mode)))
3563 (setq mark-active nil)
3564 (run-hooks 'deactivate-mark-hook))))
3566 (defun activate-mark ()
3567 "Activate the mark."
3568 (when (mark t)
3569 (setq mark-active t)
3570 (unless transient-mark-mode
3571 (setq transient-mark-mode 'lambda))
3572 (when (and select-active-regions
3573 (display-selections-p))
3574 (x-set-selection 'PRIMARY (current-buffer)))))
3576 (defun set-mark (pos)
3577 "Set this buffer's mark to POS. Don't use this function!
3578 That is to say, don't use this function unless you want
3579 the user to see that the mark has moved, and you want the previous
3580 mark position to be lost.
3582 Normally, when a new mark is set, the old one should go on the stack.
3583 This is why most applications should use `push-mark', not `set-mark'.
3585 Novice Emacs Lisp programmers often try to use the mark for the wrong
3586 purposes. The mark saves a location for the user's convenience.
3587 Most editing commands should not alter the mark.
3588 To remember a location for internal use in the Lisp program,
3589 store it in a Lisp variable. Example:
3591 (let ((beg (point))) (forward-line 1) (delete-region beg (point)))."
3593 (if pos
3594 (progn
3595 (setq mark-active t)
3596 (run-hooks 'activate-mark-hook)
3597 (when (and select-active-regions
3598 (display-selections-p))
3599 (x-set-selection 'PRIMARY (current-buffer)))
3600 (set-marker (mark-marker) pos (current-buffer)))
3601 ;; Normally we never clear mark-active except in Transient Mark mode.
3602 ;; But when we actually clear out the mark value too, we must
3603 ;; clear mark-active in any mode.
3604 (deactivate-mark t)
3605 (set-marker (mark-marker) nil)))
3607 (defcustom use-empty-active-region nil
3609 If nil, region-aware commands treat empty regions as inactive.
3610 If non-nil, region-aware commands treat the region as active as
3611 long as the mark is active, even if the region is empty.
3613 Region-aware commands are those that act on the region if it is
3614 active and Transient Mark mode is enabled, and on the text near
3615 point otherwise."
3616 :type 'boolean
3617 :version "23.1"
3618 :group 'editing-basics)
3620 (defun use-region-p ()
3621 "Return t if the region is active and it is appropriate to act on it.
3622 This is used by commands that act specially on the region under
3623 Transient Mark mode.
3625 The return value is t provided Transient Mark mode is enabled and
3626 the mark is active; and, when `use-empty-active-region' is
3627 non-nil, provided the region is empty. Otherwise, the return
3628 value is nil.
3630 For some commands, it may be appropriate to ignore the value of
3631 `use-empty-active-region'; in that case, use `region-active-p'."
3632 (and (region-active-p)
3633 (or use-empty-active-region (> (region-end) (region-beginning)))))
3635 (defun region-active-p ()
3636 "Return t if Transient Mark mode is enabled and the mark is active.
3638 Some commands act specially on the region when Transient Mark
3639 mode is enabled. Usually, such commands should use
3640 `use-region-p' instead of this function, because `use-region-p'
3641 also checks the value of `use-empty-active-region'."
3642 (and transient-mark-mode mark-active))
3644 (defvar mark-ring nil
3645 "The list of former marks of the current buffer, most recent first.")
3646 (make-variable-buffer-local 'mark-ring)
3647 (put 'mark-ring 'permanent-local t)
3649 (defcustom mark-ring-max 16
3650 "Maximum size of mark ring. Start discarding off end if gets this big."
3651 :type 'integer
3652 :group 'editing-basics)
3654 (defvar global-mark-ring nil
3655 "The list of saved global marks, most recent first.")
3657 (defcustom global-mark-ring-max 16
3658 "Maximum size of global mark ring. \
3659 Start discarding off end if gets this big."
3660 :type 'integer
3661 :group 'editing-basics)
3663 (defun pop-to-mark-command ()
3664 "Jump to mark, and pop a new position for mark off the ring.
3665 \(Does not affect global mark ring\)."
3666 (interactive)
3667 (if (null (mark t))
3668 (error "No mark set in this buffer")
3669 (if (= (point) (mark t))
3670 (message "Mark popped"))
3671 (goto-char (mark t))
3672 (pop-mark)))
3674 (defun push-mark-command (arg &optional nomsg)
3675 "Set mark at where point is.
3676 If no prefix ARG and mark is already set there, just activate it.
3677 Display `Mark set' unless the optional second arg NOMSG is non-nil."
3678 (interactive "P")
3679 (let ((mark (marker-position (mark-marker))))
3680 (if (or arg (null mark) (/= mark (point)))
3681 (push-mark nil nomsg t)
3682 (setq mark-active t)
3683 (run-hooks 'activate-mark-hook)
3684 (unless nomsg
3685 (message "Mark activated")))))
3687 (defcustom set-mark-command-repeat-pop nil
3690 will pop the mark twice, and
3692 will pop the mark three times.
3696 :type 'boolean
3697 :group 'editing-basics)
3699 (defcustom set-mark-default-inactive nil
3700 "If non-nil, setting the mark does not activate it.
3702 behave the same whether or not `transient-mark-mode' is enabled.")
3704 (defun set-mark-command (arg)
3705 "Set the mark where point is, or jump to the mark.
3706 Setting the mark also alters the region, which is the text
3707 between point and mark; this is the closest equivalent in
3710 With no prefix argument, set the mark at point, and push the
3711 old mark position on local mark ring. Also push the old mark on
3712 global mark ring, if the previous mark was set in another buffer.
3714 When Transient Mark Mode is off, immediately repeating this
3715 command activates `transient-mark-mode' temporarily.
3718 jump to the mark, and set the mark from
3719 position popped off the local mark ring \(this does not affect the global
3721 mark ring \(see `pop-global-mark'\).
3723 If `set-mark-command-repeat-pop' is non-nil, repeating
3725 off the local (or global) mark ring and jumps there.
3728 argument, unconditionally set mark where point is, even if
3729 `set-mark-command-repeat-pop' is non-nil.
3731 Novice Emacs Lisp programmers often try to use the mark for the wrong
3732 purposes. See the documentation of `set-mark' for more information."
3733 (interactive "P")
3734 (cond ((eq transient-mark-mode 'lambda)
3735 (setq transient-mark-mode nil))
3736 ((eq (car-safe transient-mark-mode) 'only)
3737 (deactivate-mark)))
3738 (cond
3739 ((and (consp arg) (> (prefix-numeric-value arg) 4))
3740 (push-mark-command nil))
3741 ((not (eq this-command 'set-mark-command))
3742 (if arg
3743 (pop-to-mark-command)
3744 (push-mark-command t)))
3745 ((and set-mark-command-repeat-pop
3746 (eq last-command 'pop-to-mark-command))
3747 (setq this-command 'pop-to-mark-command)
3748 (pop-to-mark-command))
3749 ((and set-mark-command-repeat-pop
3750 (eq last-command 'pop-global-mark)
3751 (not arg))
3752 (setq this-command 'pop-global-mark)
3753 (pop-global-mark))
3754 (arg
3755 (setq this-command 'pop-to-mark-command)
3756 (pop-to-mark-command))
3757 ((eq last-command 'set-mark-command)
3758 (if (region-active-p)
3759 (progn
3760 (deactivate-mark)
3761 (message "Mark deactivated"))
3762 (activate-mark)
3763 (message "Mark activated")))
3764 (t
3765 (push-mark-command nil)
3766 (if set-mark-default-inactive (deactivate-mark)))))
3768 (defun push-mark (&optional location nomsg activate)
3769 "Set mark at LOCATION (point, by default) and push old mark on mark ring.
3770 If the last global mark pushed was not in the current buffer,
3771 also push LOCATION on the global mark ring.
3772 Display `Mark set' unless the optional second arg NOMSG is non-nil.
3774 Novice Emacs Lisp programmers often try to use the mark for the wrong
3775 purposes. See the documentation of `set-mark' for more information.
3777 In Transient Mark mode, activate mark if optional third arg ACTIVATE non-nil."
3778 (unless (null (mark t))
3779 (setq mark-ring (cons (copy-marker (mark-marker)) mark-ring))
3780 (when (> (length mark-ring) mark-ring-max)
3781 (move-marker (car (nthcdr mark-ring-max mark-ring)) nil)
3782 (setcdr (nthcdr (1- mark-ring-max) mark-ring) nil)))
3783 (set-marker (mark-marker) (or location (point)) (current-buffer))
3784 ;; Now push the mark on the global mark ring.
3785 (if (and global-mark-ring
3786 (eq (marker-buffer (car global-mark-ring)) (current-buffer)))
3787 ;; The last global mark pushed was in this same buffer.
3788 ;; Don't push another one.
3789 nil
3790 (setq global-mark-ring (cons (copy-marker (mark-marker)) global-mark-ring))
3791 (when (> (length global-mark-ring) global-mark-ring-max)
3792 (move-marker (car (nthcdr global-mark-ring-max global-mark-ring)) nil)
3793 (setcdr (nthcdr (1- global-mark-ring-max) global-mark-ring) nil)))
3794 (or nomsg executing-kbd-macro (> (minibuffer-depth) 0)
3795 (message "Mark set"))
3796 (if (or activate (not transient-mark-mode))
3797 (set-mark (mark t)))
3798 nil)
3800 (defun pop-mark ()
3801 "Pop off mark ring into the buffer's actual mark.
3802 Does not set point. Does nothing if mark ring is empty."
3803 (when mark-ring
3804 (setq mark-ring (nconc mark-ring (list (copy-marker (mark-marker)))))
3805 (set-marker (mark-marker) (+ 0 (car mark-ring)) (current-buffer))
3806 (move-marker (car mark-ring) nil)
3807 (if (null (mark t)) (ding))
3808 (setq mark-ring (cdr mark-ring)))
3809 (deactivate-mark))
3811 (defalias 'exchange-dot-and-mark 'exchange-point-and-mark)
3812 (defun exchange-point-and-mark (&optional arg)
3813 "Put the mark where point is now, and point where the mark is now.
3814 This command works even when the mark is not active,
3815 and it reactivates the mark.
3817 If Transient Mark mode is on, a prefix ARG deactivates the mark
3818 if it is active, and otherwise avoids reactivating it. If
3819 Transient Mark mode is off, a prefix ARG enables Transient Mark
3820 mode temporarily."
3821 (interactive "P")
3822 (let ((omark (mark t))
3823 (temp-highlight (eq (car-safe transient-mark-mode) 'only)))
3824 (if (null omark)
3825 (error "No mark set in this buffer"))
3826 (deactivate-mark)
3827 (set-mark (point))
3828 (goto-char omark)
3829 (if set-mark-default-inactive (deactivate-mark))
3830 (cond (temp-highlight
3831 (setq transient-mark-mode (cons 'only transient-mark-mode)))
3832 ((or (and arg (region-active-p)) ; (xor arg (not (region-active-p)))
3833 (not (or arg (region-active-p))))
3834 (deactivate-mark))
3835 (t (activate-mark)))
3836 nil))
3838 (defcustom shift-select-mode t
3839 "When non-nil, shifted motion keys activate the mark momentarily.
3841 While the mark is activated in this way, any shift-translated point
3842 motion key extends the region, and if Transient Mark mode was off, it
3843 is temporarily turned on. Furthermore, the mark will be deactivated
3844 by any subsequent point motion key that was not shift-translated, or
3845 by any action that normally deactivates the mark in Transient Mark mode.
3847 See `this-command-keys-shift-translated' for the meaning of
3848 shift-translation."
3849 :type 'boolean
3850 :group 'editing-basics)
3852 (defun handle-shift-selection ()
3853 "Activate/deactivate mark depending on invocation thru shift translation.
3854 This function is called by `call-interactively' when a command
3855 with a `^' character in its `interactive' spec is invoked, before
3856 running the command itself.
3858 If `shift-select-mode' is enabled and the command was invoked
3859 through shift translation, set the mark and activate the region
3860 temporarily, unless it was already set in this way. See
3861 `this-command-keys-shift-translated' for the meaning of shift
3862 translation.
3864 Otherwise, if the region has been activated temporarily,
3865 deactivate it, and restore the variable `transient-mark-mode' to
3866 its earlier value."
3867 (cond ((and shift-select-mode this-command-keys-shift-translated)
3868 (unless (and mark-active
3869 (eq (car-safe transient-mark-mode) 'only))
3870 (setq transient-mark-mode
3871 (cons 'only
3872 (unless (eq transient-mark-mode 'lambda)
3873 transient-mark-mode)))
3874 (push-mark nil nil t)))
3875 ((eq (car-safe transient-mark-mode) 'only)
3876 (setq transient-mark-mode (cdr transient-mark-mode))
3877 (deactivate-mark))))
3879 (define-minor-mode transient-mark-mode
3880 "Toggle Transient Mark mode.
3881 With ARG, turn Transient Mark mode on if ARG is positive, off otherwise.
3883 In Transient Mark mode, when the mark is active, the region is highlighted.
3885 So do certain other operations that set the mark
3886 but whose main purpose is something else--for example,
3892 Many commands change their behavior when Transient Mark mode is in effect
3893 and the mark is active, by acting on the region instead of their usual
3894 default part of the buffer's text. Examples of such commands include
3899 commands which are sensitive to the Transient Mark mode."
3900 :global t
3901 :init-value (not noninteractive)
3902 :initialize 'custom-initialize-delay
3903 :group 'editing-basics)
3905 ;; The variable transient-mark-mode is ugly: it can take on special
3906 ;; values. Document these here.
3907 (defvar transient-mark-mode t
3908 "*Non-nil if Transient Mark mode is enabled.
3909 See the command `transient-mark-mode' for a description of this minor mode.
3911 Non-nil also enables highlighting of the region whenever the mark is active.
3912 The variable `highlight-nonselected-windows' controls whether to highlight
3913 all windows or just the selected window.
3915 If the value is `lambda', that enables Transient Mark mode temporarily.
3916 After any subsequent action that would normally deactivate the mark
3917 \(such as buffer modification), Transient Mark mode is turned off.
3919 If the value is (only . OLDVAL), that enables Transient Mark mode
3920 temporarily. After any subsequent point motion command that is not
3921 shift-translated, or any other action that would normally deactivate
3922 the mark (such as buffer modification), the value of
3923 `transient-mark-mode' is set to OLDVAL.")
3925 (defvar widen-automatically t
3926 "Non-nil means it is ok for commands to call `widen' when they want to.
3927 Some commands will do this in order to go to positions outside
3928 the current accessible part of the buffer.
3930 If `widen-automatically' is nil, these commands will do something else
3931 as a fallback, and won't change the buffer bounds.")
3933 (defun pop-global-mark ()
3934 "Pop off global mark ring and jump to the top location."
3935 (interactive)
3936 ;; Pop entries which refer to non-existent buffers.
3937 (while (and global-mark-ring (not (marker-buffer (car global-mark-ring))))
3938 (setq global-mark-ring (cdr global-mark-ring)))
3939 (or global-mark-ring
3940 (error "No global mark set"))
3941 (let* ((marker (car global-mark-ring))
3942 (buffer (marker-buffer marker))
3943 (position (marker-position marker)))
3944 (setq global-mark-ring (nconc (cdr global-mark-ring)
3945 (list (car global-mark-ring))))
3946 (set-buffer buffer)
3947 (or (and (>= position (point-min))
3948 (<= position (point-max)))
3949 (if widen-automatically
3950 (widen)
3951 (error "Global mark position is outside accessible part of buffer")))
3952 (goto-char position)
3953 (switch-to-buffer buffer)))
3954 \f
3955 (defcustom next-line-add-newlines nil
3956 "If non-nil, `next-line' inserts newline to avoid `end of buffer' error."
3957 :type 'boolean
3958 :version "21.1"
3959 :group 'editing-basics)
3961 (defun next-line (&optional arg try-vscroll)
3962 "Move cursor vertically down ARG lines.
3963 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
3964 If there is no character in the target line exactly under the current column,
3965 the cursor is positioned after the character in that line which spans this
3966 column, or at the end of the line if it is not long enough.
3967 If there is no line in the buffer after this one, behavior depends on the
3968 value of `next-line-add-newlines'. If non-nil, it inserts a newline character
3969 to create a line, and moves the cursor to that line. Otherwise it moves the
3970 cursor to the end of the buffer.
3972 If the variable `line-move-visual' is non-nil, this command moves
3973 by display lines. Otherwise, it moves by buffer lines, without
3974 taking variable-width characters or continued lines into account.
3977 a semipermanent goal column for this command.
3978 Then instead of trying to move exactly vertically (or as close as possible),
3979 this command moves to the specified goal column (or as close as possible).
3980 The goal column is stored in the variable `goal-column', which is nil
3981 when there is no goal column.
3983 If you are thinking of using this in a Lisp program, consider
3984 using `forward-line' instead. It is usually easier to use
3985 and more reliable (no dependence on goal column, etc.)."
3987 (or arg (setq arg 1))
3988 (if (and next-line-add-newlines (= arg 1))
3989 (if (save-excursion (end-of-line) (eobp))
3990 ;; When adding a newline, don't expand an abbrev.
3991 (let ((abbrev-mode nil))
3992 (end-of-line)
3994 (line-move arg nil nil try-vscroll))
3995 (if (called-interactively-p 'interactive)
3996 (condition-case nil
3997 (line-move arg nil nil try-vscroll)
3998 ((beginning-of-buffer end-of-buffer) (ding)))
3999 (line-move arg nil nil try-vscroll)))
4000 nil)
4002 (defun previous-line (&optional arg try-vscroll)
4003 "Move cursor vertically up ARG lines.
4004 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
4005 If there is no character in the target line exactly over the current column,
4006 the cursor is positioned after the character in that line which spans this
4007 column, or at the end of the line if it is not long enough.
4009 If the variable `line-move-visual' is non-nil, this command moves
4010 by display lines. Otherwise, it moves by buffer lines, without
4011 taking variable-width characters or continued lines into account.
4014 a semipermanent goal column for this command.
4015 Then instead of trying to move exactly vertically (or as close as possible),
4016 this command moves to the specified goal column (or as close as possible).
4017 The goal column is stored in the variable `goal-column', which is nil
4018 when there is no goal column.
4020 If you are thinking of using this in a Lisp program, consider using
4021 `forward-line' with a negative argument instead. It is usually easier
4022 to use and more reliable (no dependence on goal column, etc.)."
4024 (or arg (setq arg 1))
4025 (if (called-interactively-p 'interactive)
4026 (condition-case nil
4027 (line-move (- arg) nil nil try-vscroll)
4028 ((beginning-of-buffer end-of-buffer) (ding)))
4029 (line-move (- arg) nil nil try-vscroll))
4030 nil)
4032 (defcustom track-eol nil
4033 "Non-nil means vertical motion starting at end of line keeps to ends of lines.
4034 This means moving to the end of each line moved onto.
4035 The beginning of a blank line does not count as the end of a line.
4036 This has no effect when `line-move-visual' is non-nil."
4037 :type 'boolean
4038 :group 'editing-basics)
4040 (defcustom goal-column nil
4042 :type '(choice integer
4043 (const :tag "None" nil))
4044 :group 'editing-basics)
4045 (make-variable-buffer-local 'goal-column)
4047 (defvar temporary-goal-column 0
4048 "Current goal column for vertical motion.
4049 It is the column where point was at the start of the current run
4050 of vertical motion commands.
4052 When moving by visual lines via `line-move-visual', it is a cons
4053 cell (COL . HSCROLL), where COL is the x-position, in pixels,
4054 divided by the default column width, and HSCROLL is the number of
4055 columns by which window is scrolled from left margin.
4057 When the `track-eol' feature is doing its job, the value is
4058 `most-positive-fixnum'.")
4060 (defcustom line-move-ignore-invisible t
4062 Outline mode sets this."
4063 :type 'boolean
4064 :group 'editing-basics)
4066 (defcustom line-move-visual t
4067 "When non-nil, `line-move' moves point by visual lines.
4068 This movement is based on where the cursor is displayed on the
4069 screen, instead of relying on buffer contents alone. It takes
4070 into account variable-width characters and line continuation."
4071 :type 'boolean
4072 :group 'editing-basics)
4074 ;; Returns non-nil if partial move was done.
4075 (defun line-move-partial (arg noerror to-end)
4076 (if (< arg 0)
4077 ;; Move backward (up).
4078 ;; If already vscrolled, reduce vscroll
4079 (let ((vs (window-vscroll nil t)))
4080 (when (> vs (frame-char-height))
4081 (set-window-vscroll nil (- vs (frame-char-height)) t)))
4083 ;; Move forward (down).
4084 (let* ((lh (window-line-height -1))
4085 (vpos (nth 1 lh))
4086 (ypos (nth 2 lh))
4087 (rbot (nth 3 lh))
4088 py vs)
4089 (when (or (null lh)
4090 (>= rbot (frame-char-height))
4091 (<= ypos (- (frame-char-height))))
4092 (unless lh
4093 (let ((wend (pos-visible-in-window-p t nil t)))
4094 (setq rbot (nth 3 wend)
4095 vpos (nth 5 wend))))
4096 (cond
4097 ;; If last line of window is fully visible, move forward.
4098 ((or (null rbot) (= rbot 0))
4099 nil)
4100 ;; If cursor is not in the bottom scroll margin, move forward.
4101 ((and (> vpos 0)
4102 (< (setq py
4103 (or (nth 1 (window-line-height))
4104 (let ((ppos (posn-at-point)))
4105 (cdr (or (posn-actual-col-row ppos)
4106 (posn-col-row ppos))))))
4107 (min (- (window-text-height) scroll-margin 1) (1- vpos))))
4108 nil)
4109 ;; When already vscrolled, we vscroll some more if we can,
4110 ;; or clear vscroll and move forward at end of tall image.
4111 ((> (setq vs (window-vscroll nil t)) 0)
4112 (when (> rbot 0)
4113 (set-window-vscroll nil (+ vs (min rbot (frame-char-height))) t)))
4114 ;; If cursor just entered the bottom scroll margin, move forward,
4115 ;; but also vscroll one line so redisplay wont recenter.
4116 ((and (> vpos 0)
4117 (= py (min (- (window-text-height) scroll-margin 1)
4118 (1- vpos))))
4119 (set-window-vscroll nil (frame-char-height) t)
4120 (line-move-1 arg noerror to-end)
4121 t)
4122 ;; If there are lines above the last line, scroll-up one line.
4123 ((> vpos 0)
4124 (scroll-up 1)
4125 t)
4126 ;; Finally, start vscroll.
4127 (t
4128 (set-window-vscroll nil (frame-char-height) t)))))))
4131 ;; This is like line-move-1 except that it also performs
4132 ;; vertical scrolling of tall images if appropriate.
4133 ;; That is not really a clean thing to do, since it mixes
4134 ;; scrolling with cursor motion. But so far we don't have
4135 ;; a cleaner solution to the problem of making C-n do something
4136 ;; useful given a tall image.
4137 (defun line-move (arg &optional noerror to-end try-vscroll)
4138 (unless (and auto-window-vscroll try-vscroll
4139 ;; Only vscroll for single line moves
4140 (= (abs arg) 1)
4141 ;; But don't vscroll in a keyboard macro.
4142 (not defining-kbd-macro)
4143 (not executing-kbd-macro)
4144 (line-move-partial arg noerror to-end))
4145 (set-window-vscroll nil 0 t)
4146 (if line-move-visual
4147 (line-move-visual arg noerror)
4148 (line-move-1 arg noerror to-end))))
4150 ;; Display-based alternative to line-move-1.
4151 ;; Arg says how many lines to move. The value is t if we can move the
4152 ;; specified number of lines.
4153 (defun line-move-visual (arg &optional noerror)
4154 (let ((opoint (point))
4155 (hscroll (window-hscroll))
4156 target-hscroll)
4157 ;; Check if the previous command was a line-motion command, or if
4158 ;; we were called from some other command.
4159 (if (and (consp temporary-goal-column)
4160 (memq last-command `(next-line previous-line ,this-command)))
4161 ;; If so, there's no need to reset `temporary-goal-column',
4162 ;; but we may need to hscroll.
4163 (if (or (/= (cdr temporary-goal-column) hscroll)
4164 (> (cdr temporary-goal-column) 0))
4165 (setq target-hscroll (cdr temporary-goal-column)))
4166 ;; Otherwise, we should reset `temporary-goal-column'.
4167 (let ((posn (posn-at-point)))
4168 (cond
4169 ;; Handle the `overflow-newline-into-fringe' case:
4170 ((eq (nth 1 posn) 'right-fringe)
4171 (setq temporary-goal-column (cons (- (window-width) 1) hscroll)))
4172 ((car (posn-x-y posn))
4173 (setq temporary-goal-column
4174 (cons (/ (float (car (posn-x-y posn)))
4175 (frame-char-width)) hscroll))))))
4176 (if target-hscroll
4177 (set-window-hscroll (selected-window) target-hscroll))
4178 (or (and (= (vertical-motion
4179 (cons (or goal-column
4180 (if (consp temporary-goal-column)
4181 (truncate (car temporary-goal-column))
4182 temporary-goal-column))
4183 arg))
4184 arg)
4185 (or (>= arg 0)
4186 (/= (point) opoint)
4187 ;; If the goal column lies on a display string,
4188 ;; `vertical-motion' advances the cursor to the end
4189 ;; of the string. For arg < 0, this can cause the
4190 ;; cursor to get stuck. (Bug#3020).
4191 (= (vertical-motion arg) arg)))
4192 (unless noerror
4193 (signal (if (< arg 0) 'beginning-of-buffer 'end-of-buffer)
4194 nil)))))
4196 ;; This is the guts of next-line and previous-line.
4197 ;; Arg says how many lines to move.
4198 ;; The value is t if we can move the specified number of lines.
4199 (defun line-move-1 (arg &optional noerror to-end)
4200 ;; Don't run any point-motion hooks, and disregard intangibility,
4201 ;; for intermediate positions.
4202 (let ((inhibit-point-motion-hooks t)
4203 (opoint (point))
4204 (orig-arg arg))
4205 (if (consp temporary-goal-column)
4206 (setq temporary-goal-column (+ (car temporary-goal-column)
4207 (cdr temporary-goal-column))))
4208 (unwind-protect
4209 (progn
4210 (if (not (memq last-command '(next-line previous-line)))
4211 (setq temporary-goal-column
4212 (if (and track-eol (eolp)
4213 ;; Don't count beg of empty line as end of line
4214 ;; unless we just did explicit end-of-line.
4215 (or (not (bolp)) (eq last-command 'move-end-of-line)))
4216 most-positive-fixnum
4217 (current-column))))
4219 (if (not (or (integerp selective-display)
4220 line-move-ignore-invisible))
4221 ;; Use just newline characters.
4222 ;; Set ARG to 0 if we move as many lines as requested.
4223 (or (if (> arg 0)
4224 (progn (if (> arg 1) (forward-line (1- arg)))
4225 ;; This way of moving forward ARG lines
4226 ;; verifies that we have a newline after the last one.
4227 ;; It doesn't get confused by intangible text.
4228 (end-of-line)
4229 (if (zerop (forward-line 1))
4230 (setq arg 0)))
4231 (and (zerop (forward-line arg))
4232 (bolp)
4233 (setq arg 0)))
4234 (unless noerror
4235 (signal (if (< arg 0)
4236 'beginning-of-buffer
4237 'end-of-buffer)
4238 nil)))
4239 ;; Move by arg lines, but ignore invisible ones.
4240 (let (done)
4241 (while (and (> arg 0) (not done))
4242 ;; If the following character is currently invisible,
4243 ;; skip all characters with that same `invisible' property value.
4244 (while (and (not (eobp)) (invisible-p (point)))
4245 (goto-char (next-char-property-change (point))))
4246 ;; Move a line.
4247 ;; We don't use `end-of-line', since we want to escape
4248 ;; from field boundaries ocurring exactly at point.
4249 (goto-char (constrain-to-field
4250 (let ((inhibit-field-text-motion t))
4251 (line-end-position))
4252 (point) t t
4253 'inhibit-line-move-field-capture))
4254 ;; If there's no invisibility here, move over the newline.
4255 (cond
4256 ((eobp)
4257 (if (not noerror)
4258 (signal 'end-of-buffer nil)
4259 (setq done t)))
4260 ((and (> arg 1) ;; Use vertical-motion for last move
4261 (not (integerp selective-display))
4262 (not (invisible-p (point))))
4263 ;; We avoid vertical-motion when possible
4264 ;; because that has to fontify.
4265 (forward-line 1))
4266 ;; Otherwise move a more sophisticated way.
4267 ((zerop (vertical-motion 1))
4268 (if (not noerror)
4269 (signal 'end-of-buffer nil)
4270 (setq done t))))
4271 (unless done
4272 (setq arg (1- arg))))
4273 ;; The logic of this is the same as the loop above,
4274 ;; it just goes in the other direction.
4275 (while (and (< arg 0) (not done))
4276 ;; For completely consistency with the forward-motion
4277 ;; case, we should call beginning-of-line here.
4278 ;; However, if point is inside a field and on a
4279 ;; continued line, the call to (vertical-motion -1)
4280 ;; below won't move us back far enough; then we return
4281 ;; to the same column in line-move-finish, and point
4282 ;; gets stuck -- cyd
4283 (forward-line 0)
4284 (cond
4285 ((bobp)
4286 (if (not noerror)
4287 (signal 'beginning-of-buffer nil)
4288 (setq done t)))
4289 ((and (< arg -1) ;; Use vertical-motion for last move
4290 (not (integerp selective-display))
4291 (not (invisible-p (1- (point)))))
4292 (forward-line -1))
4293 ((zerop (vertical-motion -1))
4294 (if (not noerror)
4295 (signal 'beginning-of-buffer nil)
4296 (setq done t))))
4297 (unless done
4298 (setq arg (1+ arg))
4299 (while (and ;; Don't move over previous invis lines
4300 ;; if our target is the middle of this line.
4301 (or (zerop (or goal-column temporary-goal-column))
4302 (< arg 0))
4303 (not (bobp)) (invisible-p (1- (point))))
4304 (goto-char (previous-char-property-change (point))))))))
4305 ;; This is the value the function returns.
4306 (= arg 0))
4308 (cond ((> arg 0)
4309 ;; If we did not move down as far as desired, at least go
4310 ;; to end of line. Be sure to call point-entered and
4311 ;; point-left-hooks.
4312 (let* ((npoint (prog1 (line-end-position)
4313 (goto-char opoint)))
4314 (inhibit-point-motion-hooks nil))
4315 (goto-char npoint)))
4316 ((< arg 0)
4317 ;; If we did not move up as far as desired,
4318 ;; at least go to beginning of line.
4319 (let* ((npoint (prog1 (line-beginning-position)
4320 (goto-char opoint)))
4321 (inhibit-point-motion-hooks nil))
4322 (goto-char npoint)))
4323 (t
4324 (line-move-finish (or goal-column temporary-goal-column)
4325 opoint (> orig-arg 0)))))))
4327 (defun line-move-finish (column opoint forward)
4328 (let ((repeat t))
4329 (while repeat
4330 ;; Set REPEAT to t to repeat the whole thing.
4331 (setq repeat nil)
4333 (let (new
4334 (old (point))
4335 (line-beg (save-excursion (beginning-of-line) (point)))
4336 (line-end
4337 ;; Compute the end of the line
4338 ;; ignoring effectively invisible newlines.
4339 (save-excursion
4340 ;; Like end-of-line but ignores fields.
4342 (while (and (not (eobp)) (invisible-p (point)))
4343 (goto-char (next-char-property-change (point)))
4345 (point))))
4347 ;; Move to the desired column.
4348 (line-move-to-column (truncate column))
4350 ;; Corner case: suppose we start out in a field boundary in
4351 ;; the middle of a continued line. When we get to
4352 ;; line-move-finish, point is at the start of a new *screen*
4353 ;; line but the same text line; then line-move-to-column would
4354 ;; move us backwards. Test using C-n with point on the "x" in
4355 ;; (insert "a" (propertize "x" 'field t) (make-string 89 ?y))
4356 (and forward
4357 (< (point) old)
4358 (goto-char old))
4360 (setq new (point))
4362 ;; Process intangibility within a line.
4363 ;; With inhibit-point-motion-hooks bound to nil, a call to
4364 ;; goto-char moves point past intangible text.
4366 ;; However, inhibit-point-motion-hooks controls both the
4367 ;; intangibility and the point-entered/point-left hooks. The
4368 ;; following hack avoids calling the point-* hooks
4369 ;; unnecessarily. Note that we move *forward* past intangible
4370 ;; text when the initial and final points are the same.
4371 (goto-char new)
4372 (let ((inhibit-point-motion-hooks nil))
4373 (goto-char new)
4375 ;; If intangibility moves us to a different (later) place
4376 ;; in the same line, use that as the destination.
4377 (if (<= (point) line-end)
4378 (setq new (point))
4379 ;; If that position is "too late",
4380 ;; try the previous allowable position.
4381 ;; See if it is ok.
4382 (backward-char)
4383 (if (if forward
4384 ;; If going forward, don't accept the previous
4385 ;; allowable position if it is before the target line.
4386 (< line-beg (point))
4387 ;; If going backward, don't accept the previous
4388 ;; allowable position if it is still after the target line.
4389 (<= (point) line-end))
4390 (setq new (point))
4391 ;; As a last resort, use the end of the line.
4392 (setq new line-end))))
4394 ;; Now move to the updated destination, processing fields
4395 ;; as well as intangibility.
4396 (goto-char opoint)
4397 (let ((inhibit-point-motion-hooks nil))
4398 (goto-char
4399 ;; Ignore field boundaries if the initial and final
4400 ;; positions have the same `field' property, even if the
4401 ;; fields are non-contiguous. This seems to be "nicer"
4402 ;; behavior in many situations.
4403 (if (eq (get-char-property new 'field)
4404 (get-char-property opoint 'field))
4405 new
4406 (constrain-to-field new opoint t t
4407 'inhibit-line-move-field-capture))))
4409 ;; If all this moved us to a different line,
4410 ;; retry everything within that new line.
4411 (when (or (< (point) line-beg) (> (point) line-end))
4412 ;; Repeat the intangibility and field processing.
4413 (setq repeat t))))))
4415 (defun line-move-to-column (col)
4416 "Try to find column COL, considering invisibility.
4417 This function works only in certain cases,
4418 because what we really need is for `move-to-column'
4419 and `current-column' to be able to ignore invisible text."
4420 (if (zerop col)
4421 (beginning-of-line)
4422 (move-to-column col))
4424 (when (and line-move-ignore-invisible
4425 (not (bolp)) (invisible-p (1- (point))))
4426 (let ((normal-location (point))
4427 (normal-column (current-column)))
4428 ;; If the following character is currently invisible,
4429 ;; skip all characters with that same `invisible' property value.
4430 (while (and (not (eobp))
4431 (invisible-p (point)))
4432 (goto-char (next-char-property-change (point))))
4433 ;; Have we advanced to a larger column position?
4434 (if (> (current-column) normal-column)
4435 ;; We have made some progress towards the desired column.
4436 ;; See if we can make any further progress.
4437 (line-move-to-column (+ (current-column) (- col normal-column)))
4438 ;; Otherwise, go to the place we originally found
4439 ;; and move back over invisible text.
4440 ;; that will get us to the same place on the screen
4441 ;; but with a more reasonable buffer position.
4442 (goto-char normal-location)
4443 (let ((line-beg (save-excursion (beginning-of-line) (point))))
4444 (while (and (not (bolp)) (invisible-p (1- (point))))
4445 (goto-char (previous-char-property-change (point) line-beg))))))))
4447 (defun move-end-of-line (arg)
4448 "Move point to end of current line as displayed.
4449 With argument ARG not nil or 1, move forward ARG - 1 lines first.
4450 If point reaches the beginning or end of buffer, it stops there.
4452 To ignore the effects of the `intangible' text or overlay
4453 property, bind `inhibit-point-motion-hooks' to t.
4454 If there is an image in the current line, this function
4455 disregards newlines that are part of the text on which the image
4456 rests."
4457 (interactive "^p")
4458 (or arg (setq arg 1))
4459 (let (done)
4460 (while (not done)
4461 (let ((newpos
4462 (save-excursion
4463 (let ((goal-column 0)
4464 (line-move-visual nil))
4465 (and (line-move arg t)
4466 (not (bobp))
4467 (progn
4468 (while (and (not (bobp)) (invisible-p (1- (point))))
4469 (goto-char (previous-single-char-property-change
4470 (point) 'invisible)))
4471 (backward-char 1)))
4472 (point)))))
4473 (goto-char newpos)
4474 (if (and (> (point) newpos)
4476 (backward-char 1)
4477 (if (and (> (point) newpos) (not (eobp))
4479 ;; If we skipped something intangible and now we're not
4480 ;; really at eol, keep going.
4481 (setq arg 1)
4482 (setq done t)))))))
4484 (defun move-beginning-of-line (arg)
4485 "Move point to beginning of current line as displayed.
4486 \(If there's an image in the line, this disregards newlines
4487 which are part of the text that the image rests on.)
4489 With argument ARG not nil or 1, move forward ARG - 1 lines first.
4490 If point reaches the beginning or end of buffer, it stops there.
4491 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4492 (interactive "^p")
4493 (or arg (setq arg 1))
4495 (let ((orig (point))
4496 first-vis first-vis-field-value)
4498 ;; Move by lines, if ARG is not 1 (the default).
4499 (if (/= arg 1)
4500 (let ((line-move-visual nil))
4501 (line-move (1- arg) t)))
4503 ;; Move to beginning-of-line, ignoring fields and invisibles.
4505 (while (and (not (bobp)) (invisible-p (1- (point))))
4506 (goto-char (previous-char-property-change (point)))
4509 ;; Now find first visible char in the line
4510 (while (and (not (eobp)) (invisible-p (point)))
4511 (goto-char (next-char-property-change (point))))
4512 (setq first-vis (point))
4514 ;; See if fields would stop us from reaching FIRST-VIS.
4515 (setq first-vis-field-value
4516 (constrain-to-field first-vis orig (/= arg 1) t nil))
4518 (goto-char (if (/= first-vis-field-value first-vis)
4519 ;; If yes, obey them.
4520 first-vis-field-value
4521 ;; Otherwise, move to START with attention to fields.
4522 ;; (It is possible that fields never matter in this case.)
4523 (constrain-to-field (point) orig
4524 (/= arg 1) t nil)))))
4527 ;; Many people have said they rarely use this feature, and often type
4528 ;; it by accident. Maybe it shouldn't even be on a key.
4529 (put 'set-goal-column 'disabled t)
4531 (defun set-goal-column (arg)
4533 Those commands will move to this position in the line moved to
4534 rather than trying to keep the same horizontal position.
4535 With a non-nil argument ARG, clears out the goal column
4537 The goal column is stored in the variable `goal-column'."
4538 (interactive "P")
4539 (if arg
4540 (progn
4541 (setq goal-column nil)
4542 (message "No goal column"))
4543 (setq goal-column (current-column))
4544 ;; The older method below can be erroneous if `set-goal-column' is bound
4545 ;; to a sequence containing %
4546 ;;(message (substitute-command-keys
4548 ;;goal-column)
4549 (message "%s"
4550 (concat
4551 (format "Goal column %d " goal-column)
4552 (substitute-command-keys
4555 )
4556 nil)
4557 \f
4558 ;;; Editing based on visual lines, as opposed to logical lines.
4560 (defun end-of-visual-line (&optional n)
4561 "Move point to end of current visual line.
4562 With argument N not nil or 1, move forward N - 1 visual lines first.
4563 If point reaches the beginning or end of buffer, it stops there.
4564 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4565 (interactive "^p")
4566 (or n (setq n 1))
4567 (if (/= n 1)
4568 (let ((line-move-visual t))
4569 (line-move (1- n) t)))
4570 (vertical-motion (cons (window-width) 0)))
4572 (defun beginning-of-visual-line (&optional n)
4573 "Move point to beginning of current visual line.
4574 With argument N not nil or 1, move forward N - 1 visual lines first.
4575 If point reaches the beginning or end of buffer, it stops there.
4576 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4577 (interactive "^p")
4578 (or n (setq n 1))
4579 (if (/= n 1)
4580 (let ((line-move-visual t))
4581 (line-move (1- n) t)))
4582 (vertical-motion 0))
4584 (defun kill-visual-line (&optional arg)
4585 "Kill the rest of the visual line.
4586 With prefix argument ARG, kill that many visual lines from point.
4587 If ARG is negative, kill visual lines backward.
4588 If ARG is zero, kill the text before point on the current visual
4589 line.
4591 If you want to append the killed line to the last killed text,
4594 If the buffer is read-only, Emacs will beep and refrain from deleting
4595 the line, but put the line in the kill ring anyway. This means that
4596 you can use this command to copy text from a read-only buffer.
4597 \(If the variable `kill-read-only-ok' is non-nil, then this won't
4598 even beep.)"
4599 (interactive "P")
4600 ;; Like in `kill-line', it's better to move point to the other end
4601 ;; of the kill before killing.
4602 (let ((opoint (point))
4603 (kill-whole-line (and kill-whole-line (bolp))))
4604 (if arg
4605 (vertical-motion (prefix-numeric-value arg))
4606 (end-of-visual-line 1)
4607 (if (= (point) opoint)
4608 (vertical-motion 1)
4609 ;; Skip any trailing whitespace at the end of the visual line.
4610 ;; We used to do this only if `show-trailing-whitespace' is
4611 ;; nil, but that's wrong; the correct thing would be to check
4612 ;; whether the trailing whitespace is highlighted. But, it's
4613 ;; OK to just do this unconditionally.
4616 (1+ (point))
4617 (point)))))
4619 (defun next-logical-line (&optional arg try-vscroll)
4620 "Move cursor vertically down ARG lines.
4621 This is identical to `next-line', except that it always moves
4622 by logical lines instead of visual lines, ignoring the value of
4623 the variable `line-move-visual'."
4625 (let ((line-move-visual nil))
4626 (with-no-warnings
4627 (next-line arg try-vscroll))))
4629 (defun previous-logical-line (&optional arg try-vscroll)
4630 "Move cursor vertically up ARG lines.
4631 This is identical to `previous-line', except that it always moves
4632 by logical lines instead of visual lines, ignoring the value of
4633 the variable `line-move-visual'."
4635 (let ((line-move-visual nil))
4636 (with-no-warnings
4637 (previous-line arg try-vscroll))))
4639 (defgroup visual-line nil
4640 "Editing based on visual lines."
4641 :group 'convenience
4642 :version "23.1")
4644 (defvar visual-line-mode-map
4645 (let ((map (make-sparse-keymap)))
4646 (define-key map [remap kill-line] 'kill-visual-line)
4647 (define-key map [remap move-beginning-of-line] 'beginning-of-visual-line)
4648 (define-key map [remap move-end-of-line] 'end-of-visual-line)
4649 ;; These keybindings interfere with xterm function keys. Are
4650 ;; there any other suitable bindings?
4651 ;; (define-key map "\M-[" 'previous-logical-line)
4652 ;; (define-key map "\M-]" 'next-logical-line)
4653 map))
4655 (defcustom visual-line-fringe-indicators '(nil nil)
4656 "How fringe indicators are shown for wrapped lines in `visual-line-mode'.
4657 The value should be a list of the form (LEFT RIGHT), where LEFT
4658 and RIGHT are symbols representing the bitmaps to display, to
4659 indicate wrapped lines, in the left and right fringes respectively.
4660 See also `fringe-indicator-alist'.
4661 The default is not to display fringe indicators for wrapped lines.
4662 This variable does not affect fringe indicators displayed for
4663 other purposes."
4664 :type '(list (choice (const :tag "Hide left indicator" nil)
4665 (const :tag "Left curly arrow" left-curly-arrow)
4666 (symbol :tag "Other bitmap"))
4667 (choice (const :tag "Hide right indicator" nil)
4668 (const :tag "Right curly arrow" right-curly-arrow)
4669 (symbol :tag "Other bitmap")))
4670 :set (lambda (symbol value)
4671 (dolist (buf (buffer-list))
4672 (with-current-buffer buf
4673 (when (and (boundp 'visual-line-mode)
4674 (symbol-value 'visual-line-mode))
4675 (setq fringe-indicator-alist
4676 (cons (cons 'continuation value)
4677 (assq-delete-all
4678 'continuation
4679 (copy-tree fringe-indicator-alist)))))))
4680 (set-default symbol value)))
4682 (defvar visual-line--saved-state nil)
4684 (define-minor-mode visual-line-mode
4685 "Redefine simple editing commands to act on visual lines, not logical lines.
4686 This also turns on `word-wrap' in the buffer."
4687 :keymap visual-line-mode-map
4688 :group 'visual-line
4689 :lighter " wrap"
4690 (if visual-line-mode
4691 (progn
4692 (set (make-local-variable 'visual-line--saved-state) nil)
4693 ;; Save the local values of some variables, to be restored if
4694 ;; visual-line-mode is turned off.
4695 (dolist (var '(line-move-visual truncate-lines
4696 truncate-partial-width-windows
4697 word-wrap fringe-indicator-alist))
4698 (if (local-variable-p var)
4699 (push (cons var (symbol-value var))
4700 visual-line--saved-state)))
4701 (set (make-local-variable 'line-move-visual) t)
4702 (set (make-local-variable 'truncate-partial-width-windows) nil)
4703 (setq truncate-lines nil
4704 word-wrap t
4705 fringe-indicator-alist
4706 (cons (cons 'continuation visual-line-fringe-indicators)
4707 fringe-indicator-alist)))
4708 (kill-local-variable 'line-move-visual)
4709 (kill-local-variable 'word-wrap)
4710 (kill-local-variable 'truncate-lines)
4711 (kill-local-variable 'truncate-partial-width-windows)
4712 (kill-local-variable 'fringe-indicator-alist)
4713 (dolist (saved visual-line--saved-state)
4714 (set (make-local-variable (car saved)) (cdr saved)))
4715 (kill-local-variable 'visual-line--saved-state)))
4717 (defun turn-on-visual-line-mode ()
4718 (visual-line-mode 1))
4720 (define-globalized-minor-mode global-visual-line-mode
4721 visual-line-mode turn-on-visual-line-mode
4722 :lighter " vl")
4723 \f
4724 (defun scroll-other-window-down (lines)
4726 For more details, see the documentation for `scroll-other-window'."
4727 (interactive "P")
4728 (scroll-other-window
4729 ;; Just invert the argument's meaning.
4730 ;; We can do that without knowing which window it will be.
4731 (if (eq lines '-) nil
4732 (if (null lines) '-
4733 (- (prefix-numeric-value lines))))))
4735 (defun beginning-of-buffer-other-window (arg)
4736 "Move point to the beginning of the buffer in the other window.
4737 Leave mark at previous position.
4738 With arg N, put point N/10 of the way from the true beginning."
4739 (interactive "P")
4740 (let ((orig-window (selected-window))
4741 (window (other-window-for-scrolling)))
4742 ;; We use unwind-protect rather than save-window-excursion
4743 ;; because the latter would preserve the things we want to change.
4744 (unwind-protect
4745 (progn
4746 (select-window window)
4747 ;; Set point and mark in that window's buffer.
4748 (with-no-warnings
4749 (beginning-of-buffer arg))
4750 ;; Set point accordingly.
4751 (recenter '(t)))
4752 (select-window orig-window))))
4754 (defun end-of-buffer-other-window (arg)
4755 "Move point to the end of the buffer in the other window.
4756 Leave mark at previous position.
4757 With arg N, put point N/10 of the way from the true end."
4758 (interactive "P")
4759 ;; See beginning-of-buffer-other-window for comments.
4760 (let ((orig-window (selected-window))
4761 (window (other-window-for-scrolling)))
4762 (unwind-protect
4763 (progn
4764 (select-window window)
4765 (with-no-warnings
4766 (end-of-buffer arg))
4767 (recenter '(t)))
4768 (select-window orig-window))))
4769 \f
4770 (defun transpose-chars (arg)
4771 "Interchange characters around point, moving forward one character.
4772 With prefix arg ARG, effect is to take character before point
4773 and drag it forward past ARG other characters (backward if ARG negative).
4774 If no argument and at end of line, the previous two chars are exchanged."
4775 (interactive "*P")
4776 (and (null arg) (eolp) (forward-char -1))
4777 (transpose-subr 'forward-char (prefix-numeric-value arg)))
4779 (defun transpose-words (arg)
4780 "Interchange words around point, leaving point at end of them.
4781 With prefix arg ARG, effect is to take word before or around point
4782 and drag it forward past ARG other words (backward if ARG negative).
4783 If ARG is zero, the words around or after point and around or after mark
4784 are interchanged."
4785 ;; FIXME: `foo a!nd bar' should transpose into `bar and foo'.
4786 (interactive "*p")
4787 (transpose-subr 'forward-word arg))
4789 (defun transpose-sexps (arg)
4791 Does not work on a sexp that point is in the middle of
4792 if it is a list or string."
4793 (interactive "*p")
4794 (transpose-subr
4795 (lambda (arg)
4796 ;; Here we should try to simulate the behavior of
4797 ;; (cons (progn (forward-sexp x) (point))
4798 ;; (progn (forward-sexp (- x)) (point)))
4799 ;; Except that we don't want to rely on the second forward-sexp
4800 ;; putting us back to where we want to be, since forward-sexp-function
4801 ;; might do funny things like infix-precedence.
4802 (if (if (> arg 0)
4804 (and (not (bobp))
4806 ;; Jumping over a symbol. We might be inside it, mind you.
4807 (progn (funcall (if (> arg 0)
4808 'skip-syntax-backward 'skip-syntax-forward)
4809 "w_")
4810 (cons (save-excursion (forward-sexp arg) (point)) (point)))
4811 ;; Otherwise, we're between sexps. Take a step back before jumping
4812 ;; to make sure we'll obey the same precedence no matter which direction
4813 ;; we're going.
4814 (funcall (if (> arg 0) 'skip-syntax-backward 'skip-syntax-forward) " .")
4815 (cons (save-excursion (forward-sexp arg) (point))
4816 (progn (while (or (forward-comment (if (> arg 0) 1 -1))
4817 (not (zerop (funcall (if (> arg 0)
4818 'skip-syntax-forward
4819 'skip-syntax-backward)
4820 ".")))))
4821 (point)))))
4822 arg 'special))
4824 (defun transpose-lines (arg)
4825 "Exchange current line and previous line, leaving point after both.
4826 With argument ARG, takes previous line and moves it past ARG lines.
4827 With argument 0, interchanges line point is in with line mark is in."
4828 (interactive "*p")
4829 (transpose-subr (function
4830 (lambda (arg)
4831 (if (> arg 0)
4832 (progn
4833 ;; Move forward over ARG lines,
4834 ;; but create newlines if necessary.
4835 (setq arg (forward-line arg))
4837 (setq arg (1+ arg)))
4838 (if (> arg 0)
4839 (newline arg)))
4840 (forward-line arg))))
4841 arg))
4843 (defun transpose-subr (mover arg &optional special)
4844 (let ((aux (if special mover
4845 (lambda (x)
4846 (cons (progn (funcall mover x) (point))
4847 (progn (funcall mover (- x)) (point))))))
4848 pos1 pos2)
4849 (cond
4850 ((= arg 0)
4851 (save-excursion
4852 (setq pos1 (funcall aux 1))
4853 (goto-char (mark))
4854 (setq pos2 (funcall aux 1))
4855 (transpose-subr-1 pos1 pos2))
4856 (exchange-point-and-mark))
4857 ((> arg 0)
4858 (setq pos1 (funcall aux -1))
4859 (setq pos2 (funcall aux arg))
4860 (transpose-subr-1 pos1 pos2)
4861 (goto-char (car pos2)))
4862 (t
4863 (setq pos1 (funcall aux -1))
4864 (goto-char (car pos1))
4865 (setq pos2 (funcall aux arg))
4866 (transpose-subr-1 pos1 pos2)))))
4868 (defun transpose-subr-1 (pos1 pos2)
4869 (when (> (car pos1) (cdr pos1)) (setq pos1 (cons (cdr pos1) (car pos1))))
4870 (when (> (car pos2) (cdr pos2)) (setq pos2 (cons (cdr pos2) (car pos2))))
4871 (when (> (car pos1) (car pos2))
4872 (let ((swap pos1))
4873 (setq pos1 pos2 pos2 swap)))
4874 (if (> (cdr pos1) (car pos2)) (error "Don't have two things to transpose"))
4875 (atomic-change-group
4876 (let (word2)
4877 ;; FIXME: We first delete the two pieces of text, so markers that
4878 ;; used to point to after the text end up pointing to before it :-(
4879 (setq word2 (delete-and-extract-region (car pos2) (cdr pos2)))
4880 (goto-char (car pos2))
4881 (insert (delete-and-extract-region (car pos1) (cdr pos1)))
4882 (goto-char (car pos1))
4883 (insert word2))))
4884 \f
4885 (defun backward-word (&optional arg)
4886 "Move backward until encountering the beginning of a word.
4887 With argument ARG, do this that many times."
4888 (interactive "^p")
4889 (forward-word (- (or arg 1))))
4891 (defun mark-word (&optional arg allow-extend)
4892 "Set mark ARG words away from point.
4894 move to with the same argument.
4895 Interactively, if this command is repeated
4896 or (in Transient Mark mode) if the mark is active,
4897 it marks the next ARG words after the ones already marked."
4899 (cond ((and allow-extend
4900 (or (and (eq last-command this-command) (mark t))
4901 (region-active-p)))
4902 (setq arg (if arg (prefix-numeric-value arg)
4903 (if (< (mark) (point)) -1 1)))
4904 (set-mark
4905 (save-excursion
4906 (goto-char (mark))
4907 (forward-word arg)
4908 (point))))
4909 (t
4910 (push-mark
4911 (save-excursion
4912 (forward-word (prefix-numeric-value arg))
4913 (point))
4914 nil t))))
4916 (defun kill-word (arg)
4917 "Kill characters forward until encountering the end of a word.
4918 With argument ARG, do this that many times."
4919 (interactive "p")
4920 (kill-region (point) (progn (forward-word arg) (point))))
4922 (defun backward-kill-word (arg)
4923 "Kill characters backward until encountering the beginning of a word.
4924 With argument ARG, do this that many times."
4925 (interactive "p")
4926 (kill-word (- arg)))
4928 (defun current-word (&optional strict really-word)
4929 "Return the symbol or word that point is on (or a nearby one) as a string.
4930 The return value includes no text properties.
4931 If optional arg STRICT is non-nil, return nil unless point is within
4932 or adjacent to a symbol or word. In all cases the value can be nil
4933 if there is no word nearby.
4934 The function, belying its name, normally finds a symbol.
4935 If optional arg REALLY-WORD is non-nil, it finds just a word."
4936 (save-excursion
4937 (let* ((oldpoint (point)) (start (point)) (end (point))
4938 (syntaxes (if really-word "w" "w_"))
4939 (not-syntaxes (concat "^" syntaxes)))
4940 (skip-syntax-backward syntaxes) (setq start (point))
4941 (goto-char oldpoint)
4942 (skip-syntax-forward syntaxes) (setq end (point))
4943 (when (and (eq start oldpoint) (eq end oldpoint)
4944 ;; Point is neither within nor adjacent to a word.
4945 (not strict))
4946 ;; Look for preceding word in same line.
4947 (skip-syntax-backward not-syntaxes
4948 (save-excursion (beginning-of-line)
4949 (point)))
4950 (if (bolp)
4951 ;; No preceding word in same line.
4952 ;; Look for following word in same line.
4953 (progn
4954 (skip-syntax-forward not-syntaxes
4955 (save-excursion (end-of-line)
4956 (point)))
4957 (setq start (point))
4958 (skip-syntax-forward syntaxes)
4959 (setq end (point)))
4960 (setq end (point))
4961 (skip-syntax-backward syntaxes)
4962 (setq start (point))))
4963 ;; If we found something nonempty, return it as a string.
4964 (unless (= start end)
4965 (buffer-substring-no-properties start end)))))
4966 \f
4967 (defcustom fill-prefix nil
4968 "String for filling to insert at front of new line, or nil for none."
4969 :type '(choice (const :tag "None" nil)
4970 string)
4971 :group 'fill)
4972 (make-variable-buffer-local 'fill-prefix)
4973 (put 'fill-prefix 'safe-local-variable 'string-or-null-p)
4975 (defcustom auto-fill-inhibit-regexp nil
4976 "Regexp to match lines which should not be auto-filled."
4977 :type '(choice (const :tag "None" nil)
4978 regexp)
4979 :group 'fill)
4981 ;; This function is used as the auto-fill-function of a buffer
4982 ;; when Auto-Fill mode is enabled.
4983 ;; It returns t if it really did any work.
4984 ;; (Actually some major modes use a different auto-fill function,
4985 ;; but this one is the default one.)
4986 (defun do-auto-fill ()
4987 (let (fc justify give-up
4988 (fill-prefix fill-prefix))
4989 (if (or (not (setq justify (current-justification)))
4990 (null (setq fc (current-fill-column)))
4991 (and (eq justify 'left)
4992 (<= (current-column) fc))
4993 (and auto-fill-inhibit-regexp
4994 (save-excursion (beginning-of-line)
4995 (looking-at auto-fill-inhibit-regexp))))
4996 nil ;; Auto-filling not required
4997 (if (memq justify '(full center right))
4998 (save-excursion (unjustify-current-line)))
5000 ;; Choose a fill-prefix automatically.
5001 (when (and adaptive-fill-mode
5002 (or (null fill-prefix) (string= fill-prefix "")))
5003 (let ((prefix
5004 (fill-context-prefix
5005 (save-excursion (backward-paragraph 1) (point))
5006 (save-excursion (forward-paragraph 1) (point)))))
5007 (and prefix (not (equal prefix ""))
5008 ;; Use auto-indentation rather than a guessed empty prefix.
5009 (not (and fill-indent-according-to-mode
5011 (setq fill-prefix prefix))))
5013 (while (and (not give-up) (> (current-column) fc))
5014 ;; Determine where to split the line.
5015 (let* (after-prefix
5016 (fill-point
5017 (save-excursion
5018 (beginning-of-line)
5019 (setq after-prefix (point))
5020 (and fill-prefix
5021 (looking-at (regexp-quote fill-prefix))
5022 (setq after-prefix (match-end 0)))
5023 (move-to-column (1+ fc))
5024 (fill-move-to-break-point after-prefix)
5025 (point))))
5027 ;; See whether the place we found is any good.
5028 (if (save-excursion
5029 (goto-char fill-point)
5030 (or (bolp)
5031 ;; There is no use breaking at end of line.
5032 (save-excursion (skip-chars-forward " ") (eolp))
5033 ;; It is futile to split at the end of the prefix
5034 ;; since we would just insert the prefix again.
5035 (and after-prefix (<= (point) after-prefix))
5036 ;; Don't split right after a comment starter
5037 ;; since we would just make another comment starter.
5038 (and comment-start-skip
5039 (let ((limit (point)))
5040 (beginning-of-line)
5041 (and (re-search-forward comment-start-skip
5042 limit t)
5043 (eq (point) limit))))))
5044 ;; No good place to break => stop trying.
5045 (setq give-up t)
5046 ;; Ok, we have a useful place to break the line. Do it.
5047 (let ((prev-column (current-column)))
5048 ;; If point is at the fill-point, do not `save-excursion'.
5049 ;; Otherwise, if a comment prefix or fill-prefix is inserted,
5050 ;; point will end up before it rather than after it.
5051 (if (save-excursion
5053 (= (point) fill-point))
5054 (default-indent-new-line t)
5055 (save-excursion
5056 (goto-char fill-point)
5057 (default-indent-new-line t)))
5058 ;; Now do justification, if required
5059 (if (not (eq justify 'left))
5060 (save-excursion
5061 (end-of-line 0)
5062 (justify-current-line justify nil t)))
5063 ;; If making the new line didn't reduce the hpos of
5064 ;; the end of the line, then give up now;
5065 ;; trying again will not help.
5066 (if (>= (current-column) prev-column)
5067 (setq give-up t))))))
5068 ;; Justify last line.
5069 (justify-current-line justify t t)
5070 t)))
5072 (defvar comment-line-break-function 'comment-indent-new-line
5073 "*Mode-specific function which line breaks and continues a comment.
5074 This function is called during auto-filling when a comment syntax
5075 is defined.
5076 The function should take a single optional argument, which is a flag
5077 indicating whether it should use soft newlines.")
5079 (defun default-indent-new-line (&optional soft)
5080 "Break line at point and indent.
5081 If a comment syntax is defined, call `comment-indent-new-line'.
5083 The inserted newline is marked hard if variable `use-hard-newlines' is true,
5084 unless optional argument SOFT is non-nil."
5085 (interactive)
5086 (if comment-start
5087 (funcall comment-line-break-function soft)
5088 ;; Insert the newline before removing empty space so that markers
5089 ;; get preserved better.
5091 (save-excursion (forward-char -1) (delete-horizontal-space))
5092 (delete-horizontal-space)
5094 (if (and fill-prefix (not adaptive-fill-mode))
5095 ;; Blindly trust a non-adaptive fill-prefix.
5096 (progn
5097 (indent-to-left-margin)
5098 (insert-before-markers-and-inherit fill-prefix))
5100 (cond
5101 ;; If there's an adaptive prefix, use it unless we're inside
5102 ;; a comment and the prefix is not a comment starter.
5103 (fill-prefix
5104 (indent-to-left-margin)
5105 (insert-and-inherit fill-prefix))
5106 ;; If we're not inside a comment, just try to indent.
5107 (t (indent-according-to-mode))))))
5109 (defvar normal-auto-fill-function 'do-auto-fill
5110 "The function to use for `auto-fill-function' if Auto Fill mode is turned on.
5111 Some major modes set this.")
5113 (put 'auto-fill-function :minor-mode-function 'auto-fill-mode)
5114 ;; `functions' and `hooks' are usually unsafe to set, but setting
5115 ;; auto-fill-function to nil in a file-local setting is safe and
5116 ;; can be useful to prevent auto-filling.
5117 (put 'auto-fill-function 'safe-local-variable 'null)
5118 ;; FIXME: turn into a proper minor mode.
5119 ;; Add a global minor mode version of it.
5120 (defun auto-fill-mode (&optional arg)
5121 "Toggle Auto Fill mode.
5122 With ARG, turn Auto Fill mode on if and only if ARG is positive.
5123 In Auto Fill mode, inserting a space at a column beyond `current-fill-column'
5124 automatically breaks the line at a previous space.
5126 The value of `normal-auto-fill-function' specifies the function to use
5127 for `auto-fill-function' when turning Auto Fill mode on."
5128 (interactive "P")
5129 (prog1 (setq auto-fill-function
5130 (if (if (null arg)
5131 (not auto-fill-function)
5132 (> (prefix-numeric-value arg) 0))
5133 normal-auto-fill-function
5134 nil))
5135 (force-mode-line-update)))
5137 ;; This holds a document string used to document auto-fill-mode.
5138 (defun auto-fill-function ()
5139 "Automatically break line at a previous space, in insertion of text."
5140 nil)
5142 (defun turn-on-auto-fill ()
5143 "Unconditionally turn on Auto Fill mode."
5144 (auto-fill-mode 1))
5146 (defun turn-off-auto-fill ()
5147 "Unconditionally turn off Auto Fill mode."
5148 (auto-fill-mode -1))
5150 (custom-add-option 'text-mode-hook 'turn-on-auto-fill)
5152 (defun set-fill-column (arg)
5153 "Set `fill-column' to specified argument.
5156 (interactive
5157 (list (or current-prefix-arg
5158 ;; We used to use current-column silently, but C-x f is too easily
5159 ;; typed as a typo for C-x C-f, so we turned it into an error and
5160 ;; now an interactive prompt.
5161 (read-number "Set fill-column to: " (current-column)))))
5162 (if (consp arg)
5163 (setq arg (current-column)))
5164 (if (not (integerp arg))
5165 ;; Disallow missing argument; it's probably a typo for C-x C-f.
5166 (error "set-fill-column requires an explicit argument")
5167 (message "Fill column set to %d (was %d)" arg fill-column)
5168 (setq fill-column arg)))
5169 \f
5170 (defun set-selective-display (arg)
5171 "Set `selective-display' to ARG; clear it if no arg.
5172 When the value of `selective-display' is a number > 0,
5173 lines whose indentation is >= that value are not displayed.
5174 The variable `selective-display' has a separate value for each buffer."
5175 (interactive "P")
5176 (if (eq selective-display t)
5177 (error "selective-display already in use for marked lines"))
5178 (let ((current-vpos
5179 (save-restriction
5180 (narrow-to-region (point-min) (point))
5181 (goto-char (window-start))
5182 (vertical-motion (window-height)))))
5183 (setq selective-display
5184 (and arg (prefix-numeric-value arg)))
5185 (recenter current-vpos))
5186 (set-window-start (selected-window) (window-start (selected-window)))
5187 (princ "selective-display set to " t)
5188 (prin1 selective-display t)
5189 (princ "." t))
5191 (defvaralias 'indicate-unused-lines 'indicate-empty-lines)
5193 (defun toggle-truncate-lines (&optional arg)
5194 "Toggle whether to fold or truncate long lines for the current buffer.
5195 With prefix argument ARG, truncate long lines if ARG is positive,
5196 otherwise don't truncate them. Note that in side-by-side windows,
5197 this command has no effect if `truncate-partial-width-windows'
5198 is non-nil."
5199 (interactive "P")
5200 (setq truncate-lines
5201 (if (null arg)
5202 (not truncate-lines)
5203 (> (prefix-numeric-value arg) 0)))
5204 (force-mode-line-update)
5205 (unless truncate-lines
5206 (let ((buffer (current-buffer)))
5207 (walk-windows (lambda (window)
5208 (if (eq buffer (window-buffer window))
5209 (set-window-hscroll window 0)))
5210 nil t)))
5211 (message "Truncate long lines %s"
5212 (if truncate-lines "enabled" "disabled")))
5214 (defun toggle-word-wrap (&optional arg)
5215 "Toggle whether to use word-wrapping for continuation lines.
5216 With prefix argument ARG, wrap continuation lines at word boundaries
5217 if ARG is positive, otherwise wrap them at the right screen edge.
5218 This command toggles the value of `word-wrap'. It has no effect
5219 if long lines are truncated."
5220 (interactive "P")
5221 (setq word-wrap
5222 (if (null arg)
5223 (not word-wrap)
5224 (> (prefix-numeric-value arg) 0)))
5225 (force-mode-line-update)
5226 (message "Word wrapping %s"
5227 (if word-wrap "enabled" "disabled")))
5229 (defvar overwrite-mode-textual " Ovwrt"
5230 "The string displayed in the mode line when in overwrite mode.")
5231 (defvar overwrite-mode-binary " Bin Ovwrt"
5232 "The string displayed in the mode line when in binary overwrite mode.")
5234 (defun overwrite-mode (arg)
5235 "Toggle overwrite mode.
5236 With prefix argument ARG, turn overwrite mode on if ARG is positive,
5237 otherwise turn it off. In overwrite mode, printing characters typed
5238 in replace existing text on a one-for-one basis, rather than pushing
5239 it to the right. At the end of a line, such characters extend the line.
5240 Before a tab, such characters insert until the tab is filled in.
5242 is supposed to make it easier to insert characters when necessary."
5243 (interactive "P")
5244 (setq overwrite-mode
5245 (if (if (null arg) (not overwrite-mode)
5246 (> (prefix-numeric-value arg) 0))
5247 'overwrite-mode-textual))
5248 (force-mode-line-update))
5250 (defun binary-overwrite-mode (arg)
5251 "Toggle binary overwrite mode.
5252 With prefix argument ARG, turn binary overwrite mode on if ARG is
5253 positive, otherwise turn it off. In binary overwrite mode, printing
5254 characters typed in replace existing text. Newlines are not treated
5255 specially, so typing at the end of a line joins the line to the next,
5256 with the typed character between them. Typing before a tab character
5258 replaces the text at the cursor, just as ordinary typing characters do.
5260 Note that binary overwrite mode is not its own minor mode; it is a
5261 specialization of overwrite mode, entered by setting the
5262 `overwrite-mode' variable to `overwrite-mode-binary'."
5263 (interactive "P")
5264 (setq overwrite-mode
5265 (if (if (null arg)
5266 (not (eq overwrite-mode 'overwrite-mode-binary))
5267 (> (prefix-numeric-value arg) 0))
5268 'overwrite-mode-binary))
5269 (force-mode-line-update))
5271 (define-minor-mode line-number-mode
5272 "Toggle Line Number mode.
5273 With ARG, turn Line Number mode on if ARG is positive, otherwise
5274 turn it off. When Line Number mode is enabled, the line number
5275 appears in the mode line.
5277 Line numbers do not appear for very large buffers and buffers
5278 with very long lines; see variables `line-number-display-limit'
5279 and `line-number-display-limit-width'."
5280 :init-value t :global t :group 'mode-line)
5282 (define-minor-mode column-number-mode
5283 "Toggle Column Number mode.
5284 With ARG, turn Column Number mode on if ARG is positive,
5285 otherwise turn it off. When Column Number mode is enabled, the
5286 column number appears in the mode line."
5287 :global t :group 'mode-line)
5289 (define-minor-mode size-indication-mode
5290 "Toggle Size Indication mode.
5291 With ARG, turn Size Indication mode on if ARG is positive,
5292 otherwise turn it off. When Size Indication mode is enabled, the
5293 size of the accessible part of the buffer appears in the mode line."
5294 :global t :group 'mode-line)
5295 \f
5296 (defgroup paren-blinking nil
5297 "Blinking matching of parens and expressions."
5298 :prefix "blink-matching-"
5299 :group 'paren-matching)
5301 (defcustom blink-matching-paren t
5302 "Non-nil means show matching open-paren when close-paren is inserted."
5303 :type 'boolean
5304 :group 'paren-blinking)
5306 (defcustom blink-matching-paren-on-screen t
5307 "Non-nil means show matching open-paren when it is on screen.
5308 If nil, don't show it (but the open-paren can still be shown
5309 when it is off screen).
5311 This variable has no effect if `blink-matching-paren' is nil.
5312 \(In that case, the open-paren is never shown.)
5313 It is also ignored if `show-paren-mode' is enabled."
5314 :type 'boolean
5315 :group 'paren-blinking)
5317 (defcustom blink-matching-paren-distance (* 100 1024)
5318 "If non-nil, maximum distance to search backwards for matching open-paren.
5319 If nil, search stops at the beginning of the accessible portion of the buffer."
5320 :version "23.2" ; 25->100k
5321 :type '(choice (const nil) integer)
5322 :group 'paren-blinking)
5324 (defcustom blink-matching-delay 1
5325 "Time in seconds to delay after showing a matching paren."
5326 :type 'number
5327 :group 'paren-blinking)
5329 (defcustom blink-matching-paren-dont-ignore-comments nil
5330 "If nil, `blink-matching-paren' ignores comments.
5331 More precisely, when looking for the matching parenthesis,
5332 it skips the contents of comments that end before point."
5333 :type 'boolean
5334 :group 'paren-blinking)
5336 (defun blink-matching-open ()
5337 "Move cursor momentarily to the beginning of the sexp before point."
5338 (interactive)
5339 (when (and (> (point) (point-min))
5340 blink-matching-paren
5341 ;; Verify an even number of quoting characters precede the close.
5342 (= 1 (logand 1 (- (point)
5343 (save-excursion
5344 (forward-char -1)
5346 (point))))))
5347 (let* ((oldpos (point))
5348 (message-log-max nil) ; Don't log messages about paren matching.
5349 (atdollar (eq (syntax-class (syntax-after (1- oldpos))) 8))
5350 (isdollar)
5351 (blinkpos
5352 (save-excursion
5353 (save-restriction
5354 (if blink-matching-paren-distance
5355 (narrow-to-region
5356 (max (minibuffer-prompt-end) ;(point-min) unless minibuf.
5357 (- (point) blink-matching-paren-distance))
5358 oldpos))
5359 (let ((parse-sexp-ignore-comments
5360 (and parse-sexp-ignore-comments
5361 (not blink-matching-paren-dont-ignore-comments))))
5362 (condition-case ()
5363 (scan-sexps oldpos -1)
5364 (error nil))))))
5365 (matching-paren
5366 (and blinkpos
5367 ;; Not syntax '$'.
5368 (not (setq isdollar
5369 (eq (syntax-class (syntax-after blinkpos)) 8)))
5370 (let ((syntax (syntax-after blinkpos)))
5371 (and (consp syntax)
5372 (eq (syntax-class syntax) 4)
5373 (cdr syntax))))))
5374 (cond
5375 ;; isdollar is for:
5376 ;; http://lists.gnu.org/archive/html/emacs-devel/2007-10/msg00871.html
5377 ((not (or (and isdollar blinkpos)
5378 (and atdollar (not blinkpos)) ; see below
5379 (eq matching-paren (char-before oldpos))
5380 ;; The cdr might hold a new paren-class info rather than
5381 ;; a matching-char info, in which case the two CDRs
5382 ;; should match.
5383 (eq matching-paren (cdr (syntax-after (1- oldpos))))))
5384 (if (minibufferp)
5385 (minibuffer-message " [Mismatched parentheses]")
5386 (message "Mismatched parentheses")))
5387 ((not blinkpos)
5388 (or blink-matching-paren-distance
5389 ;; Don't complain when `$' with no blinkpos, because it
5390 ;; could just be the first one typed in the buffer.
5391 atdollar
5392 (if (minibufferp)
5393 (minibuffer-message " [Unmatched parenthesis]")
5394 (message "Unmatched parenthesis"))))
5395 ((pos-visible-in-window-p blinkpos)
5396 ;; Matching open within window, temporarily move to blinkpos but only
5397 ;; if `blink-matching-paren-on-screen' is non-nil.
5398 (and blink-matching-paren-on-screen
5399 (not show-paren-mode)
5400 (save-excursion
5401 (goto-char blinkpos)
5402 (sit-for blink-matching-delay))))
5403 (t
5404 (save-excursion
5405 (goto-char blinkpos)
5406 (let ((open-paren-line-string
5407 ;; Show what precedes the open in its line, if anything.
5408 (cond
5410 (buffer-substring (line-beginning-position)
5411 (1+ blinkpos)))
5412 ;; Show what follows the open in its line, if anything.
5413 ((save-excursion
5414 (forward-char 1)
5416 (not (eolp)))
5417 (buffer-substring blinkpos
5418 (line-end-position)))
5419 ;; Otherwise show the previous nonblank line,
5420 ;; if there is one.
5422 (concat
5423 (buffer-substring (progn
5425 (line-beginning-position))
5426 (progn (end-of-line)
5428 (point)))
5429 ;; Replace the newline and other whitespace with `...'.
5430 "..."
5431 (buffer-substring blinkpos (1+ blinkpos))))
5432 ;; There is nothing to show except the char itself.
5433 (t (buffer-substring blinkpos (1+ blinkpos))))))
5434 (message "Matches %s"
5435 (substring-no-properties open-paren-line-string)))))))))
5437 (setq blink-paren-function 'blink-matching-open)
5438 \f
5439 ;; This executes C-g typed while Emacs is waiting for a command.
5440 ;; Quitting out of a program does not go through here;
5441 ;; that happens in the QUIT macro at the C code level.
5442 (defun keyboard-quit ()
5443 "Signal a `quit' condition.
5444 During execution of Lisp code, this character causes a quit directly.
5445 At top-level, as an editor command, this simply beeps."
5446 (interactive)
5447 (deactivate-mark)
5448 (if (fboundp 'kmacro-keyboard-quit)
5449 (kmacro-keyboard-quit))
5450 (setq defining-kbd-macro nil)
5451 (signal 'quit nil))
5453 (defvar buffer-quit-function nil
5456 \(such as cancelling a prefix argument, minibuffer or region) do not apply.")
5458 (defun keyboard-escape-quit ()
5460 This command can exit an interactive command such as `query-replace',
5461 can clear out a prefix argument or a region,
5462 can get out of the minibuffer or other recursive edit,
5463 cancel the use of the current buffer (for special-purpose buffers),
5464 or go back to just one window (by deleting all but the selected window)."
5465 (interactive)
5466 (cond ((eq last-command 'mode-exited) nil)
5467 ((> (minibuffer-depth) 0)
5468 (abort-recursive-edit))
5469 (current-prefix-arg
5470 nil)
5471 ((region-active-p)
5472 (deactivate-mark))
5473 ((> (recursion-depth) 0)
5474 (exit-recursive-edit))
5475 (buffer-quit-function
5476 (funcall buffer-quit-function))
5477 ((not (one-window-p t))
5478 (delete-other-windows))
5480 (bury-buffer))))
5482 (defun play-sound-file (file &optional volume device)
5483 "Play sound stored in FILE.
5484 VOLUME and DEVICE correspond to the keywords of the sound
5485 specification for `play-sound'."
5486 (interactive "fPlay sound file: ")
5487 (let ((sound (list :file file)))
5488 (if volume
5489 (plist-put sound :volume volume))
5490 (if device
5491 (plist-put sound :device device))
5492 (push 'sound sound)
5493 (play-sound sound)))
5495 \f
5496 (defcustom read-mail-command 'rmail
5497 "Your preference for a mail reading package.
5498 This is used by some keybindings which support reading mail.
5499 See also `mail-user-agent' concerning sending mail."
5500 :type '(choice (function-item rmail)
5501 (function-item gnus)
5502 (function-item mh-rmail)
5503 (function :tag "Other"))
5504 :version "21.1"
5505 :group 'mail)
5507 (defcustom mail-user-agent 'message-user-agent
5508 "Your preference for a mail composition package.
5509 Various Emacs Lisp packages (e.g. Reporter) require you to compose an
5510 outgoing email message. This variable lets you specify which
5511 mail-sending package you prefer.
5513 Valid values include:
5515 `message-user-agent' -- use the Message package.
5516 See Info node `(message)'.
5517 `sendmail-user-agent' -- use the Mail package.
5518 See Info node `(emacs)Sending Mail'.
5519 `mh-e-user-agent' -- use the Emacs interface to the MH mail system.
5520 See Info node `(mh-e)'.
5521 `gnus-user-agent' -- like `message-user-agent', but with Gnus
5522 paraphernalia, particularly the Gcc: header for
5523 archiving.
5525 Additional valid symbols may be available; check with the author of
5526 your package for details. The function should return non-nil if it
5527 succeeds.
5529 See also `read-mail-command' concerning reading mail."
5530 :type '(radio (function-item :tag "Message package"
5532 message-user-agent)
5533 (function-item :tag "Mail package"
5535 sendmail-user-agent)
5536 (function-item :tag "Emacs interface to MH"
5538 mh-e-user-agent)
5539 (function-item :tag "Message with full Gnus features"
5541 gnus-user-agent)
5542 (function :tag "Other"))
5543 :version "23.2" ; sendmail->message
5544 :group 'mail)
5546 (define-mail-user-agent 'sendmail-user-agent
5547 'sendmail-user-agent-compose
5548 'mail-send-and-exit)
5550 (defun rfc822-goto-eoh ()
5551 ;; Go to header delimiter line in a mail message, following RFC822 rules
5552 (goto-char (point-min))
5553 (when (re-search-forward
5555 (goto-char (match-beginning 0))))
5557 (defun sendmail-user-agent-compose (&optional to subject other-headers continue
5558 switch-function yank-action
5559 send-actions)
5560 (if switch-function
5561 (let ((special-display-buffer-names nil)
5562 (special-display-regexps nil)
5563 (same-window-buffer-names nil)
5564 (same-window-regexps nil))
5565 (funcall switch-function "*mail*")))
5566 (let ((cc (cdr (assoc-string "cc" other-headers t)))
5567 (in-reply-to (cdr (assoc-string "in-reply-to" other-headers t)))
5568 (body (cdr (assoc-string "body" other-headers t))))
5569 (or (mail continue to subject in-reply-to cc yank-action send-actions)
5570 continue
5571 (error "Message aborted"))
5572 (save-excursion
5573 (rfc822-goto-eoh)
5574 (while other-headers
5575 (unless (member-ignore-case (car (car other-headers))
5576 '("in-reply-to" "cc" "body"))
5577 (insert (car (car other-headers)) ": "
5578 (cdr (car other-headers))
5580 (setq other-headers (cdr other-headers)))
5581 (when body
5582 (forward-line 1)
5583 (insert body))
5584 t)))
5586 (defun compose-mail (&optional to subject other-headers continue
5587 switch-function yank-action send-actions)
5588 "Start composing a mail message to send.
5589 This uses the user's chosen mail composition package
5590 as selected with the variable `mail-user-agent'.
5591 The optional arguments TO and SUBJECT specify recipients
5592 and the initial Subject field, respectively.
5594 OTHER-HEADERS is an alist specifying additional
5595 header fields. Elements look like (HEADER . VALUE) where both
5596 HEADER and VALUE are strings.
5598 CONTINUE, if non-nil, says to continue editing a message already
5599 being composed. Interactively, CONTINUE is the prefix argument.
5601 SWITCH-FUNCTION, if non-nil, is a function to use to
5602 switch to and display the buffer used for mail composition.
5604 YANK-ACTION, if non-nil, is an action to perform, if and when necessary,
5605 to insert the raw text of the message being replied to.
5606 It has the form (FUNCTION . ARGS). The user agent will apply
5607 FUNCTION to ARGS, to insert the raw text of the original message.
5608 \(The user agent will also run `mail-citation-hook', *after* the
5609 original text has been inserted in this way.)
5611 SEND-ACTIONS is a list of actions to call when the message is sent.
5612 Each action has the form (FUNCTION . ARGS)."
5613 (interactive
5614 (list nil nil nil current-prefix-arg))
5615 (let ((function (get mail-user-agent 'composefunc)))
5616 (funcall function to subject other-headers continue
5617 switch-function yank-action send-actions)))
5619 (defun compose-mail-other-window (&optional to subject other-headers continue
5620 yank-action send-actions)
5622 (interactive
5623 (list nil nil nil current-prefix-arg))
5624 (compose-mail to subject other-headers continue
5625 'switch-to-buffer-other-window yank-action send-actions))
5628 (defun compose-mail-other-frame (&optional to subject other-headers continue
5629 yank-action send-actions)
5631 (interactive
5632 (list nil nil nil current-prefix-arg))
5633 (compose-mail to subject other-headers continue
5634 'switch-to-buffer-other-frame yank-action send-actions))
5635 \f
5636 (defvar set-variable-value-history nil
5637 "History of values entered with `set-variable'.
5639 Maximum length of the history list is determined by the value
5640 of `history-length', which see.")
5642 (defun set-variable (variable value &optional make-local)
5643 "Set VARIABLE to VALUE. VALUE is a Lisp object.
5644 VARIABLE should be a user option variable name, a Lisp variable
5645 meant to be customized by users. You should enter VALUE in Lisp syntax,
5646 so if you want VALUE to be a string, you must surround it with doublequotes.
5647 VALUE is used literally, not evaluated.
5649 If VARIABLE has a `variable-interactive' property, that is used as if
5650 it were the arg to `interactive' (which see) to interactively read VALUE.
5652 If VARIABLE has been defined with `defcustom', then the type information
5653 in the definition is used to check that VALUE is valid.
5655 With a prefix argument, set VARIABLE to VALUE buffer-locally."
5656 (interactive
5657 (let* ((default-var (variable-at-point))
5658 (var (if (user-variable-p default-var)
5659 (read-variable (format "Set variable (default %s): " default-var)
5660 default-var)
5661 (read-variable "Set variable: ")))
5662 (minibuffer-help-form '(describe-variable var))
5663 (prop (get var 'variable-interactive))
5664 (obsolete (car (get var 'byte-obsolete-variable)))
5665 (prompt (format "Set %s %s to value: " var
5666 (cond ((local-variable-p var)
5667 "(buffer-local)")
5668 ((or current-prefix-arg
5669 (local-variable-if-set-p var))
5670 "buffer-locally")
5671 (t "globally"))))
5672 (val (progn
5673 (when obsolete
5674 (message (concat "`%S' is obsolete; "
5675 (if (symbolp obsolete) "use `%S' instead" "%s"))
5676 var obsolete)
5677 (sit-for 3))
5678 (if prop
5679 ;; Use VAR's `variable-interactive' property
5680 ;; as an interactive spec for prompting.
5681 (call-interactively `(lambda (arg)
5682 (interactive ,prop)
5683 arg))
5684 (read
5685 (read-string prompt nil
5686 'set-variable-value-history
5687 (format "%S" (symbol-value var))))))))
5688 (list var val current-prefix-arg)))
5690 (and (custom-variable-p variable)
5691 (not (get variable 'custom-type))
5692 (custom-load-symbol variable))
5693 (let ((type (get variable 'custom-type)))
5694 (when type
5695 ;; Match with custom type.
5696 (require 'cus-edit)
5697 (setq type (widget-convert type))
5698 (unless (widget-apply type :match value)
5699 (error "Value `%S' does not match type %S of %S"
5700 value (car type) variable))))
5702 (if make-local
5703 (make-local-variable variable))
5705 (set variable value)
5707 ;; Force a thorough redisplay for the case that the variable
5708 ;; has an effect on the display, like `tab-width' has.
5709 (force-mode-line-update))
5710 \f
5711 ;; Define the major mode for lists of completions.
5713 (defvar completion-list-mode-map
5714 (let ((map (make-sparse-keymap)))
5715 (define-key map [mouse-2] 'mouse-choose-completion)
5716 (define-key map [follow-link] 'mouse-face)
5717 (define-key map [down-mouse-2] nil)
5718 (define-key map "\C-m" 'choose-completion)
5719 (define-key map "\e\e\e" 'delete-completion-window)
5720 (define-key map [left] 'previous-completion)
5721 (define-key map [right] 'next-completion)
5722 (define-key map "q" 'quit-window)
5723 map)
5724 "Local map for completion list buffers.")
5726 ;; Completion mode is suitable only for specially formatted data.
5727 (put 'completion-list-mode 'mode-class 'special)
5729 (defvar completion-reference-buffer nil
5730 "Record the buffer that was current when the completion list was requested.
5731 This is a local variable in the completion list buffer.
5732 Initial value is nil to avoid some compiler warnings.")
5734 (defvar completion-no-auto-exit nil
5735 "Non-nil means `choose-completion-string' should never exit the minibuffer.
5736 This also applies to other functions such as `choose-completion'
5737 and `mouse-choose-completion'.")
5739 (defvar completion-base-size nil
5740 "Number of chars before point not involved in completion.
5741 This is a local variable in the completion list buffer.
5742 It refers to the chars in the minibuffer if completing in the
5743 minibuffer, or in `completion-reference-buffer' otherwise.
5744 Only characters in the field at point are included.
5746 If nil, Emacs determines which part of the tail end of the
5747 buffer's text is involved in completion by comparing the text
5748 directly.")
5750 (defun delete-completion-window ()
5751 "Delete the completion list window.
5752 Go to the window from which completion was requested."
5753 (interactive)
5754 (let ((buf completion-reference-buffer))
5755 (if (one-window-p t)
5756 (if (window-dedicated-p (selected-window))
5757 (delete-frame (selected-frame)))
5758 (delete-window (selected-window))
5759 (if (get-buffer-window buf)
5760 (select-window (get-buffer-window buf))))))
5762 (defun previous-completion (n)
5763 "Move to the previous item in the completion list."
5764 (interactive "p")
5765 (next-completion (- n)))
5767 (defun next-completion (n)
5768 "Move to the next item in the completion list.
5769 With prefix argument N, move N items (negative N means move backward)."
5770 (interactive "p")
5771 (let ((beg (point-min)) (end (point-max)))
5772 (while (and (> n 0) (not (eobp)))
5773 ;; If in a completion, move to the end of it.
5774 (when (get-text-property (point) 'mouse-face)
5775 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
5776 ;; Move to start of next one.
5777 (unless (get-text-property (point) 'mouse-face)
5778 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
5779 (setq n (1- n)))
5780 (while (and (< n 0) (not (bobp)))
5781 (let ((prop (get-text-property (1- (point)) 'mouse-face)))
5782 ;; If in a completion, move to the start of it.
5783 (when (and prop (eq prop (get-text-property (point) 'mouse-face)))
5784 (goto-char (previous-single-property-change
5785 (point) 'mouse-face nil beg)))
5786 ;; Move to end of the previous completion.
5787 (unless (or (bobp) (get-text-property (1- (point)) 'mouse-face))
5788 (goto-char (previous-single-property-change
5789 (point) 'mouse-face nil beg)))
5790 ;; Move to the start of that one.
5791 (goto-char (previous-single-property-change
5792 (point) 'mouse-face nil beg))
5793 (setq n (1+ n))))))
5795 (defun choose-completion ()
5796 "Choose the completion that point is in or next to."
5797 (interactive)
5798 (let (beg end completion (buffer completion-reference-buffer)
5799 (base-size completion-base-size))
5800 (if (and (not (eobp)) (get-text-property (point) 'mouse-face))
5801 (setq end (point) beg (1+ (point))))
5802 (if (and (not (bobp)) (get-text-property (1- (point)) 'mouse-face))
5803 (setq end (1- (point)) beg (point)))
5804 (if (null beg)
5805 (error "No completion here"))
5806 (setq beg (previous-single-property-change beg 'mouse-face))
5807 (setq end (or (next-single-property-change end 'mouse-face) (point-max)))
5808 (setq completion (buffer-substring-no-properties beg end))
5809 (let ((owindow (selected-window)))
5810 (if (and (one-window-p t 'selected-frame)
5811 (window-dedicated-p owindow))
5812 ;; This is a special buffer's frame
5813 (iconify-frame (selected-frame))
5814 (or (window-dedicated-p (selected-window))
5815 (bury-buffer)))
5816 (select-window
5817 (or (and (buffer-live-p buffer)
5818 (get-buffer-window buffer))
5819 owindow)))
5820 (choose-completion-string completion buffer base-size)))
5822 ;; Delete the longest partial match for STRING
5823 ;; that can be found before POINT.
5824 (defun choose-completion-delete-max-match (string)
5825 (let ((opoint (point))
5826 len)
5827 ;; Try moving back by the length of the string.
5828 (goto-char (max (- (point) (length string))
5829 (minibuffer-prompt-end)))
5830 ;; See how far back we were actually able to move. That is the
5831 ;; upper bound on how much we can match and delete.
5832 (setq len (- opoint (point)))
5833 (if completion-ignore-case
5834 (setq string (downcase string)))
5835 (while (and (> len 0)
5836 (let ((tail (buffer-substring (point) opoint)))
5837 (if completion-ignore-case
5838 (setq tail (downcase tail)))
5839 (not (string= tail (substring string 0 len)))))
5840 (setq len (1- len))
5841 (forward-char 1))
5842 (delete-char len)))
5844 (defvar choose-completion-string-functions nil
5845 "Functions that may override the normal insertion of a completion choice.
5846 These functions are called in order with four arguments:
5847 CHOICE - the string to insert in the buffer,
5848 BUFFER - the buffer in which the choice should be inserted,
5849 MINI-P - non-nil if BUFFER is a minibuffer, and
5850 BASE-SIZE - the number of characters in BUFFER before
5851 the string being completed.
5853 If a function in the list returns non-nil, that function is supposed
5854 to have inserted the CHOICE in the BUFFER, and possibly exited
5855 the minibuffer; no further functions will be called.
5857 If all functions in the list return nil, that means to use
5858 the default method of inserting the completion in BUFFER.")
5860 (defun choose-completion-string (choice &optional buffer base-size)
5861 "Switch to BUFFER and insert the completion choice CHOICE.
5862 BASE-SIZE, if non-nil, says how many characters of BUFFER's text
5863 to keep. If it is nil, we call `choose-completion-delete-max-match'
5864 to decide what to delete."
5866 ;; If BUFFER is the minibuffer, exit the minibuffer
5867 ;; unless it is reading a file name and CHOICE is a directory,
5868 ;; or completion-no-auto-exit is non-nil.
5870 (let* ((buffer (or buffer completion-reference-buffer))
5871 (mini-p (minibufferp buffer)))
5872 ;; If BUFFER is a minibuffer, barf unless it's the currently
5873 ;; active minibuffer.
5874 (if (and mini-p
5875 (or (not (active-minibuffer-window))
5876 (not (equal buffer
5877 (window-buffer (active-minibuffer-window))))))
5878 (error "Minibuffer is not active for completion")
5879 ;; Set buffer so buffer-local choose-completion-string-functions works.
5880 (set-buffer buffer)
5881 (unless (run-hook-with-args-until-success
5882 'choose-completion-string-functions
5883 choice buffer mini-p base-size)
5884 ;; Insert the completion into the buffer where it was requested.
5885 ;; FIXME:
5886 ;; - There may not be a field at point, or there may be a field but
5887 ;; it's not a "completion field", in which case we have to
5888 ;; call choose-completion-delete-max-match even if base-size is set.
5889 ;; - we may need to delete further than (point) to (field-end),
5890 ;; depending on the completion-style, and for that we need to
5891 ;; extra data `completion-extra-size'.
5892 (if base-size
5893 (delete-region (+ base-size (field-beginning)) (point))
5894 (choose-completion-delete-max-match choice))
5895 (insert choice)
5896 (remove-text-properties (- (point) (length choice)) (point)
5897 '(mouse-face nil))
5898 ;; Update point in the window that BUFFER is showing in.
5899 (let ((window (get-buffer-window buffer t)))
5900 (set-window-point window (point)))
5901 ;; If completing for the minibuffer, exit it with this choice.
5902 (and (not completion-no-auto-exit)
5903 (minibufferp buffer)
5904 minibuffer-completion-table
5905 ;; If this is reading a file name, and the file name chosen
5906 ;; is a directory, don't exit the minibuffer.
5907 (let* ((result (buffer-substring (field-beginning) (point)))
5908 (bounds
5909 (completion-boundaries result minibuffer-completion-table
5910 minibuffer-completion-predicate
5911 "")))
5912 (if (eq (car bounds) (length result))
5913 ;; The completion chosen leads to a new set of completions
5914 ;; (e.g. it's a directory): don't exit the minibuffer yet.
5915 (let ((mini (active-minibuffer-window)))
5916 (select-window mini)
5917 (when minibuffer-auto-raise
5918 (raise-frame (window-frame mini))))
5919 (exit-minibuffer))))))))
5921 (define-derived-mode completion-list-mode nil "Completion List"
5922 "Major mode for buffers showing lists of possible completions.
5924 to select the completion near point.
5926 with the mouse.
5929 (set (make-local-variable 'completion-base-size) nil))
5931 (defun completion-list-mode-finish ()
5932 "Finish setup of the completions buffer.
5933 Called from `temp-buffer-show-hook'."
5934 (when (eq major-mode 'completion-list-mode)
5935 (toggle-read-only 1)))
5937 (add-hook 'temp-buffer-show-hook 'completion-list-mode-finish)
5940 ;; Variables and faces used in `completion-setup-function'.
5942 (defcustom completion-show-help t
5943 "Non-nil means show help message in *Completions* buffer."
5944 :type 'boolean
5945 :version "22.1"
5946 :group 'completion)
5948 ;; This is for packages that need to bind it to a non-default regexp
5949 ;; in order to make the first-differing character highlight work
5950 ;; to their liking
5951 (defvar completion-root-regexp "^/"
5952 "Regexp to use in `completion-setup-function' to find the root directory.")
5954 ;; This function goes in completion-setup-hook, so that it is called
5955 ;; after the text of the completion list buffer is written.
5956 (defun completion-setup-function ()
5957 (let* ((mainbuf (current-buffer))
5958 (base-dir
5959 ;; When reading a file name in the minibuffer,
5960 ;; try and find the right default-directory to set in the
5961 ;; completion list buffer.
5962 ;; FIXME: Why do we do that, actually? --Stef
5963 (if minibuffer-completing-file-name
5964 (file-name-as-directory
5965 (expand-file-name
5966 (substring (minibuffer-completion-contents)
5967 0 (or completion-base-size 0)))))))
5968 (with-current-buffer standard-output
5969 (let ((base-size completion-base-size)) ;Read before killing localvars.
5970 (completion-list-mode)
5971 (set (make-local-variable 'completion-base-size) base-size))
5972 (set (make-local-variable 'completion-reference-buffer) mainbuf)
5973 (if base-dir (setq default-directory base-dir))
5974 (unless completion-base-size
5975 ;; This shouldn't be needed any more, but further analysis is needed
5976 ;; to make sure it's the case.
5977 (setq completion-base-size
5978 (cond
5979 (minibuffer-completing-file-name
5980 ;; For file name completion, use the number of chars before
5981 ;; the start of the file name component at point.
5982 (with-current-buffer mainbuf
5983 (save-excursion
5984 (skip-chars-backward completion-root-regexp)
5985 (- (point) (minibuffer-prompt-end)))))
5986 (minibuffer-completing-symbol nil)
5987 ;; Otherwise, in minibuffer, the base size is 0.
5988 ((minibufferp mainbuf) 0))))
5989 ;; Maybe insert help string.
5990 (when completion-show-help
5991 (goto-char (point-min))
5992 (if (display-mouse-p)
5993 (insert (substitute-command-keys
5995 (insert (substitute-command-keys
5999 (add-hook 'completion-setup-hook 'completion-setup-function)
6001 (define-key minibuffer-local-completion-map [prior] 'switch-to-completions)
6002 (define-key minibuffer-local-completion-map "\M-v" 'switch-to-completions)
6004 (defun switch-to-completions ()
6005 "Select the completion list window."
6006 (interactive)
6007 ;; Make sure we have a completions window.
6008 (or (get-buffer-window "*Completions*")
6009 (minibuffer-completion-help))
6010 (let ((window (get-buffer-window "*Completions*")))
6011 (when window
6012 (select-window window)
6013 (goto-char (point-min))
6015 (forward-line 1))))
6016 \f
6017 ;;; Support keyboard commands to turn on various modifiers.
6019 ;; These functions -- which are not commands -- each add one modifier
6020 ;; to the following event.
6022 (defun event-apply-alt-modifier (ignore-prompt)
6025 (vector (event-apply-modifier (read-event) 'alt 22 "A-")))
6026 (defun event-apply-super-modifier (ignore-prompt)
6029 (vector (event-apply-modifier (read-event) 'super 23 "s-")))
6030 (defun event-apply-hyper-modifier (ignore-prompt)
6033 (vector (event-apply-modifier (read-event) 'hyper 24 "H-")))
6034 (defun event-apply-shift-modifier (ignore-prompt)
6037 (vector (event-apply-modifier (read-event) 'shift 25 "S-")))
6038 (defun event-apply-control-modifier (ignore-prompt)
6041 (vector (event-apply-modifier (read-event) 'control 26 "C-")))
6042 (defun event-apply-meta-modifier (ignore-prompt)
6045 (vector (event-apply-modifier (read-event) 'meta 27 "M-")))
6047 (defun event-apply-modifier (event symbol lshiftby prefix)
6048 "Apply a modifier flag to event EVENT.
6049 SYMBOL is the name of this modifier, as a symbol.
6050 LSHIFTBY is the numeric value of this modifier, in keyboard events.
6051 PREFIX is the string that represents this modifier in an event type symbol."
6052 (if (numberp event)
6053 (cond ((eq symbol 'control)
6054 (if (and (<= (downcase event) ?z)
6055 (>= (downcase event) ?a))
6056 (- (downcase event) ?a -1)
6057 (if (and (<= (downcase event) ?Z)
6058 (>= (downcase event) ?A))
6059 (- (downcase event) ?A -1)
6060 (logior (lsh 1 lshiftby) event))))
6061 ((eq symbol 'shift)
6062 (if (and (<= (downcase event) ?z)
6063 (>= (downcase event) ?a))
6064 (upcase event)
6065 (logior (lsh 1 lshiftby) event)))
6066 (t
6067 (logior (lsh 1 lshiftby) event)))
6068 (if (memq symbol (event-modifiers event))
6069 event
6070 (let ((event-type (if (symbolp event) event (car event))))
6071 (setq event-type (intern (concat prefix (symbol-name event-type))))
6072 (if (symbolp event)
6073 event-type
6074 (cons event-type (cdr event)))))))
6076 (define-key function-key-map [?\C-x ?@ ?h] 'event-apply-hyper-modifier)
6077 (define-key function-key-map [?\C-x ?@ ?s] 'event-apply-super-modifier)
6078 (define-key function-key-map [?\C-x ?@ ?m] 'event-apply-meta-modifier)
6079 (define-key function-key-map [?\C-x ?@ ?a] 'event-apply-alt-modifier)
6080 (define-key function-key-map [?\C-x ?@ ?S] 'event-apply-shift-modifier)
6081 (define-key function-key-map [?\C-x ?@ ?c] 'event-apply-control-modifier)
6082 \f
6083 ;;;; Keypad support.
6085 ;; Make the keypad keys act like ordinary typing keys. If people add
6086 ;; bindings for the function key symbols, then those bindings will
6087 ;; override these, so this shouldn't interfere with any existing
6088 ;; bindings.
6090 ;; Also tell read-char how to handle these keys.
6091 (mapc
6092 (lambda (keypad-normal)
6093 (let ((keypad (nth 0 keypad-normal))
6094 (normal (nth 1 keypad-normal)))
6095 (put keypad 'ascii-character normal)
6096 (define-key function-key-map (vector keypad) (vector normal))))
6097 '((kp-0 ?0) (kp-1 ?1) (kp-2 ?2) (kp-3 ?3) (kp-4 ?4)
6098 (kp-5 ?5) (kp-6 ?6) (kp-7 ?7) (kp-8 ?8) (kp-9 ?9)
6099 (kp-space ?\s)
6102 (kp-multiply ?*)
6103 (kp-add ?+)
6104 (kp-separator ?,)
6105 (kp-subtract ?-)
6106 (kp-decimal ?.)
6107 (kp-divide ?/)
6108 (kp-equal ?=)
6109 ;; Do the same for various keys that are represented as symbols under
6110 ;; GUIs but naturally correspond to characters.
6111 (backspace 127)
6112 (delete 127)
6115 (clear ?\C-l)
6116 (return ?\C-m)
6117 (escape ?\e)
6118 ))
6119 \f
6120 ;;;;
6121 ;;;; forking a twin copy of a buffer.
6122 ;;;;
6124 (defvar clone-buffer-hook nil
6125 "Normal hook to run in the new buffer at the end of `clone-buffer'.")
6127 (defvar clone-indirect-buffer-hook nil
6128 "Normal hook to run in the new buffer at the end of `clone-indirect-buffer'.")
6130 (defun clone-process (process &optional newname)
6131 "Create a twin copy of PROCESS.
6132 If NEWNAME is nil, it defaults to PROCESS' name;
6133 NEWNAME is modified by adding or incrementing <N> at the end as necessary.
6134 If PROCESS is associated with a buffer, the new process will be associated
6135 with the current buffer instead.
6136 Returns nil if PROCESS has already terminated."
6137 (setq newname (or newname (process-name process)))
6139 (setq newname (substring newname 0 (match-beginning 0))))
6140 (when (memq (process-status process) '(run stop open))
6141 (let* ((process-connection-type (process-tty-name process))
6142 (new-process
6143 (if (memq (process-status process) '(open))
6144 (let ((args (process-contact process t)))
6145 (setq args (plist-put args :name newname))
6146 (setq args (plist-put args :buffer
6147 (if (process-buffer process)
6148 (current-buffer))))
6149 (apply 'make-network-process args))
6150 (apply 'start-process newname
6151 (if (process-buffer process) (current-buffer))
6152 (process-command process)))))
6153 (set-process-query-on-exit-flag
6154 new-process (process-query-on-exit-flag process))
6155 (set-process-inherit-coding-system-flag
6156 new-process (process-inherit-coding-system-flag process))
6157 (set-process-filter new-process (process-filter process))
6158 (set-process-sentinel new-process (process-sentinel process))
6159 (set-process-plist new-process (copy-sequence (process-plist process)))
6160 new-process)))
6162 ;; things to maybe add (currently partly covered by `funcall mode'):
6163 ;; - syntax-table
6164 ;; - overlays
6165 (defun clone-buffer (&optional newname display-flag)
6166 "Create and return a twin copy of the current buffer.
6167 Unlike an indirect buffer, the new buffer can be edited
6168 independently of the old one (if it is not read-only).
6169 NEWNAME is the name of the new buffer. It may be modified by
6170 adding or incrementing <N> at the end as necessary to create a
6171 unique buffer name. If nil, it defaults to the name of the
6172 current buffer, with the proper suffix. If DISPLAY-FLAG is
6173 non-nil, the new buffer is shown with `pop-to-buffer'. Trying to
6174 clone a file-visiting buffer, or a buffer whose major mode symbol
6175 has a non-nil `no-clone' property, results in an error.
6177 Interactively, DISPLAY-FLAG is t and NEWNAME is the name of the
6178 current buffer with appropriate suffix. However, if a prefix
6179 argument is given, then the command prompts for NEWNAME in the
6180 minibuffer.
6182 This runs the normal hook `clone-buffer-hook' in the new buffer
6183 after it has been set up properly in other respects."
6184 (interactive
6185 (progn
6186 (if buffer-file-name
6187 (error "Cannot clone a file-visiting buffer"))
6188 (if (get major-mode 'no-clone)
6189 (error "Cannot clone a buffer in %s mode" mode-name))
6190 (list (if current-prefix-arg
6191 (read-buffer "Name of new cloned buffer: " (current-buffer)))
6192 t)))
6193 (if buffer-file-name
6194 (error "Cannot clone a file-visiting buffer"))
6195 (if (get major-mode 'no-clone)
6196 (error "Cannot clone a buffer in %s mode" mode-name))
6197 (setq newname (or newname (buffer-name)))
6199 (setq newname (substring newname 0 (match-beginning 0))))
6200 (let ((buf (current-buffer))
6201 (ptmin (point-min))
6202 (ptmax (point-max))
6203 (pt (point))
6204 (mk (if mark-active (mark t)))
6205 (modified (buffer-modified-p))
6206 (mode major-mode)
6207 (lvars (buffer-local-variables))
6208 (process (get-buffer-process (current-buffer)))
6209 (new (generate-new-buffer (or newname (buffer-name)))))
6210 (save-restriction
6211 (widen)
6212 (with-current-buffer new
6213 (insert-buffer-substring buf)))
6214 (with-current-buffer new
6215 (narrow-to-region ptmin ptmax)
6216 (goto-char pt)
6217 (if mk (set-mark mk))
6218 (set-buffer-modified-p modified)
6220 ;; Clone the old buffer's process, if any.
6221 (when process (clone-process process))
6223 ;; Now set up the major mode.
6224 (funcall mode)
6226 ;; Set up other local variables.
6227 (mapc (lambda (v)
6228 (condition-case () ;in case var is read-only
6229 (if (symbolp v)
6230 (makunbound v)
6231 (set (make-local-variable (car v)) (cdr v)))
6232 (error nil)))
6233 lvars)
6235 ;; Run any hooks (typically set up by the major mode
6236 ;; for cloning to work properly).
6237 (run-hooks 'clone-buffer-hook))
6238 (if display-flag
6239 ;; Presumably the current buffer is shown in the selected frame, so
6240 ;; we want to display the clone elsewhere.
6241 (let ((same-window-regexps nil)
6242 (same-window-buffer-names))
6243 (pop-to-buffer new)))
6244 new))
6247 (defun clone-indirect-buffer (newname display-flag &optional norecord)
6248 "Create an indirect buffer that is a twin copy of the current buffer.
6250 Give the indirect buffer name NEWNAME. Interactively, read NEWNAME
6251 from the minibuffer when invoked with a prefix arg. If NEWNAME is nil
6252 or if not called with a prefix arg, NEWNAME defaults to the current
6253 buffer's name. The name is modified by adding a `<N>' suffix to it
6254 or by incrementing the N in an existing suffix. Trying to clone a
6255 buffer whose major mode symbol has a non-nil `no-clone-indirect'
6256 property results in an error.
6258 DISPLAY-FLAG non-nil means show the new buffer with `pop-to-buffer'.
6259 This is always done when called interactively.
6261 Optional third arg NORECORD non-nil means do not put this buffer at the
6262 front of the list of recently selected ones."
6263 (interactive
6264 (progn
6265 (if (get major-mode 'no-clone-indirect)
6266 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6267 (list (if current-prefix-arg
6268 (read-buffer "Name of indirect buffer: " (current-buffer)))
6269 t)))
6270 (if (get major-mode 'no-clone-indirect)
6271 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6272 (setq newname (or newname (buffer-name)))
6274 (setq newname (substring newname 0 (match-beginning 0))))
6275 (let* ((name (generate-new-buffer-name newname))
6276 (buffer (make-indirect-buffer (current-buffer) name t)))
6277 (with-current-buffer buffer
6278 (run-hooks 'clone-indirect-buffer-hook))
6279 (when display-flag
6280 (pop-to-buffer buffer norecord))
6281 buffer))
6284 (defun clone-indirect-buffer-other-window (newname display-flag &optional norecord)
6285 "Like `clone-indirect-buffer' but display in another window."
6286 (interactive
6287 (progn
6288 (if (get major-mode 'no-clone-indirect)
6289 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6290 (list (if current-prefix-arg
6291 (read-buffer "Name of indirect buffer: " (current-buffer)))
6292 t)))
6293 (let ((pop-up-windows t))
6294 (clone-indirect-buffer newname display-flag norecord)))
6296 \f
6297 ;;; Handling of Backspace and Delete keys.
6299 (defcustom normal-erase-is-backspace 'maybe
6300 "Set the default behavior of the Delete and Backspace keys.
6302 If set to t, Delete key deletes forward and Backspace key deletes
6303 backward.
6305 If set to nil, both Delete and Backspace keys delete backward.
6307 If set to 'maybe (which is the default), Emacs automatically
6308 selects a behavior. On window systems, the behavior depends on
6309 the keyboard used. If the keyboard has both a Backspace key and
6310 a Delete key, and both are mapped to their usual meanings, the
6311 option's default value is set to t, so that Backspace can be used
6312 to delete backward, and Delete can be used to delete forward.
6314 If not running under a window system, customizing this option
6315 accomplishes a similar effect by mapping C-h, which is usually
6316 generated by the Backspace key, to DEL, and by mapping DEL to C-d
6317 via `keyboard-translate'. The former functionality of C-h is
6318 available on the F1 key. You should probably not use this
6319 setting if you don't have both Backspace, Delete and F1 keys.
6321 Setting this variable with setq doesn't take effect. Programmatically,
6322 call `normal-erase-is-backspace-mode' (which see) instead."
6323 :type '(choice (const :tag "Off" nil)
6324 (const :tag "Maybe" maybe)
6325 (other :tag "On" t))
6326 :group 'editing-basics
6327 :version "21.1"
6328 :set (lambda (symbol value)
6329 ;; The fboundp is because of a problem with :set when
6330 ;; dumping Emacs. It doesn't really matter.
6331 (if (fboundp 'normal-erase-is-backspace-mode)
6332 (normal-erase-is-backspace-mode (or value 0))
6333 (set-default symbol value))))
6335 (defun normal-erase-is-backspace-setup-frame (&optional frame)
6336 "Set up `normal-erase-is-backspace-mode' on FRAME, if necessary."
6337 (unless frame (setq frame (selected-frame)))
6338 (with-selected-frame frame
6339 (unless (terminal-parameter nil 'normal-erase-is-backspace)
6340 (normal-erase-is-backspace-mode
6341 (if (if (eq normal-erase-is-backspace 'maybe)
6342 (and (not noninteractive)
6343 (or (memq system-type '(ms-dos windows-nt))
6344 (and (memq window-system '(x))
6345 (fboundp 'x-backspace-delete-keys-p)
6346 (x-backspace-delete-keys-p))
6347 ;; If the terminal Emacs is running on has erase char
6348 ;; set to ^H, use the Backspace key for deleting
6349 ;; backward, and the Delete key for deleting forward.
6350 (and (null window-system)
6351 (eq tty-erase-char ?\^H))))
6352 normal-erase-is-backspace)
6353 1 0)))))
6355 (defun normal-erase-is-backspace-mode (&optional arg)
6356 "Toggle the Erase and Delete mode of the Backspace and Delete keys.
6358 With numeric ARG, turn the mode on if and only if ARG is positive.
6360 On window systems, when this mode is on, Delete is mapped to C-d
6361 and Backspace is mapped to DEL; when this mode is off, both
6362 Delete and Backspace are mapped to DEL. (The remapping goes via
6363 `local-function-key-map', so binding Delete or Backspace in the
6364 global or local keymap will override that.)
6366 In addition, on window systems, the bindings of C-Delete, M-Delete,
6367 C-M-Delete, C-Backspace, M-Backspace, and C-M-Backspace are changed in
6368 the global keymap in accordance with the functionality of Delete and
6369 Backspace. For example, if Delete is remapped to C-d, which deletes
6370 forward, C-Delete is bound to `kill-word', but if Delete is remapped
6371 to DEL, which deletes backward, C-Delete is bound to
6372 `backward-kill-word'.
6374 If not running on a window system, a similar effect is accomplished by
6375 remapping C-h (normally produced by the Backspace key) and DEL via
6376 `keyboard-translate': if this mode is on, C-h is mapped to DEL and DEL
6377 to C-d; if it's off, the keys are not remapped.
6379 When not running on a window system, and this mode is turned on, the
6380 former functionality of C-h is available on the F1 key. You should
6381 probably not turn on this mode on a text-only terminal if you don't
6382 have both Backspace, Delete and F1 keys.
6384 See also `normal-erase-is-backspace'."
6385 (interactive "P")
6386 (let ((enabled (or (and arg (> (prefix-numeric-value arg) 0))
6387 (not (or arg
6388 (eq 1 (terminal-parameter
6389 nil 'normal-erase-is-backspace)))))))
6390 (set-terminal-parameter nil 'normal-erase-is-backspace
6391 (if enabled 1 0))
6393 (cond ((or (memq window-system '(x w32 ns pc))
6394 (memq system-type '(ms-dos windows-nt)))
6395 (let* ((bindings
6396 `(([M-delete] [M-backspace])
6397 ([C-M-delete] [C-M-backspace])
6398 (,esc-map
6399 [C-delete] [C-backspace])))
6400 (old-state (lookup-key local-function-key-map [delete])))
6402 (if enabled
6403 (progn
6404 (define-key local-function-key-map [delete] [?\C-d])
6405 (define-key local-function-key-map [kp-delete] [?\C-d])
6406 (define-key local-function-key-map [backspace] [?\C-?]))
6407 (define-key local-function-key-map [delete] [?\C-?])
6408 (define-key local-function-key-map [kp-delete] [?\C-?])
6409 (define-key local-function-key-map [backspace] [?\C-?]))
6411 ;; Maybe swap bindings of C-delete and C-backspace, etc.
6412 (unless (equal old-state (lookup-key local-function-key-map [delete]))
6413 (dolist (binding bindings)
6414 (let ((map global-map))
6415 (when (keymapp (car binding))
6416 (setq map (car binding) binding (cdr binding)))
6417 (let* ((key1 (nth 0 binding))
6418 (key2 (nth 1 binding))
6419 (binding1 (lookup-key map key1))
6420 (binding2 (lookup-key map key2)))
6421 (define-key map key1 binding2)
6422 (define-key map key2 binding1)))))))
6423 (t
6424 (if enabled
6425 (progn
6426 (keyboard-translate ?\C-h ?\C-?)
6427 (keyboard-translate ?\C-? ?\C-d))
6428 (keyboard-translate ?\C-h ?\C-h)
6429 (keyboard-translate ?\C-? ?\C-?))))
6431 (run-hooks 'normal-erase-is-backspace-hook)
6432 (if (called-interactively-p 'interactive)
6433 (message "Delete key deletes %s"
6434 (if (terminal-parameter nil 'normal-erase-is-backspace)
6435 "forward" "backward")))))
6436 \f
6437 (defvar vis-mode-saved-buffer-invisibility-spec nil
6438 "Saved value of `buffer-invisibility-spec' when Visible mode is on.")
6440 (define-minor-mode visible-mode
6441 "Toggle Visible mode.
6442 With argument ARG turn Visible mode on if ARG is positive, otherwise
6443 turn it off.
6445 Enabling Visible mode makes all invisible text temporarily visible.
6446 Disabling Visible mode turns off that effect. Visible mode works by
6447 saving the value of `buffer-invisibility-spec' and setting it to nil."
6448 :lighter " Vis"
6449 :group 'editing-basics
6450 (when (local-variable-p 'vis-mode-saved-buffer-invisibility-spec)
6451 (setq buffer-invisibility-spec vis-mode-saved-buffer-invisibility-spec)
6452 (kill-local-variable 'vis-mode-saved-buffer-invisibility-spec))
6453 (when visible-mode
6454 (set (make-local-variable 'vis-mode-saved-buffer-invisibility-spec)
6455 buffer-invisibility-spec)
6456 (setq buffer-invisibility-spec nil)))
6457 \f
6458 ;; Partial application of functions (similar to "currying").
6459 (defun apply-partially (fun &rest args)
6460 "Return a function that is a partial application of FUN to ARGS.
6461 ARGS is a list of the first N arguments to pass to FUN.
6462 The result is a new function which does the same as FUN, except that
6463 the first N arguments are fixed at the values with which this function
6464 was called."
6465 (lexical-let ((fun fun) (args1 args))
6466 (lambda (&rest args2) (apply fun (append args1 args2)))))
6467 \f
6468 ;; Minibuffer prompt stuff.
6470 ;(defun minibuffer-prompt-modification (start end)
6471 ; (error "You cannot modify the prompt"))
6472 ;
6473 ;
6474 ;(defun minibuffer-prompt-insertion (start end)
6475 ; (let ((inhibit-modification-hooks t))
6476 ; (delete-region start end)
6477 ; ;; Discard undo information for the text insertion itself
6478 ; ;; and for the text deletion.above.
6479 ; (when (consp buffer-undo-list)
6480 ; (setq buffer-undo-list (cddr buffer-undo-list)))
6481 ; (message "You cannot modify the prompt")))
6482 ;
6483 ;
6484 ;(setq minibuffer-prompt-properties
6485 ; (list 'modification-hooks '(minibuffer-prompt-modification)
6486 ; 'insert-in-front-hooks '(minibuffer-prompt-insertion)))
6487 ;
6489 \f
6490 ;;;; Problematic external packages.
6492 ;; rms says this should be done by specifying symbols that define
6493 ;; versions together with bad values. This is therefore not as
6494 ;; flexible as it could be. See the thread:
6495 ;; http://lists.gnu.org/archive/html/emacs-devel/2007-08/msg00300.html
6496 (defconst bad-packages-alist
6497 ;; Not sure exactly which semantic versions have problems.
6498 ;; Definitely 2.0pre3, probably all 2.0pre's before this.
6500 "The version of `semantic' loaded does not work in Emacs 22.
6501 It can cause constant high CPU load.
6502 Upgrade to at least Semantic 2.0pre4 (distributed with CEDET 1.0pre4).")
6503 ;; CUA-mode does not work with GNU Emacs version 22.1 and newer.
6504 ;; Except for version 1.2, all of the 1.x and 2.x version of cua-mode
6505 ;; provided the `CUA-mode' feature. Since this is no longer true,
6506 ;; we can warn the user if the `CUA-mode' feature is ever provided.
6507 (CUA-mode t nil
6508 "CUA-mode is now part of the standard GNU Emacs distribution,
6509 so you can now enable CUA via the Options menu or by customizing `cua-mode'.
6511 You have loaded an older version of CUA-mode which does not work
6512 correctly with this version of Emacs. You should remove the old
6513 version and use the one distributed with Emacs."))
6514 "Alist of packages known to cause problems in this version of Emacs.
6515 Each element has the form (PACKAGE SYMBOL REGEXP STRING).
6516 PACKAGE is either a regular expression to match file names, or a
6517 symbol (a feature name); see the documentation of
6518 `after-load-alist', to which this variable adds functions.
6519 SYMBOL is either the name of a string variable, or `t'. Upon
6520 loading PACKAGE, if SYMBOL is t or matches REGEXP, display a
6521 warning using STRING as the message.")
6523 (defun bad-package-check (package)
6524 "Run a check using the element from `bad-packages-alist' matching PACKAGE."
6525 (condition-case nil
6526 (let* ((list (assoc package bad-packages-alist))
6527 (symbol (nth 1 list)))
6528 (and list
6529 (boundp symbol)
6530 (or (eq symbol t)
6531 (and (stringp (setq symbol (eval symbol)))
6532 (string-match-p (nth 2 list) symbol)))
6533 (display-warning package (nth 3 list) :warning)))
6534 (error nil)))
6536 (mapc (lambda (elem)
6537 (eval-after-load (car elem) `(bad-package-check ',(car elem))))
6538 bad-packages-alist)
6541 (provide 'simple)
6543 ;; arch-tag: 24af67c0-2a49-44f6-b3b1-312d8b570dfd
6544 ;;; simple.el ends here