| blob | d267089214c72924853d77173e3392ccec64de20 |
1 ;;; simple.el --- basic editing commands for Emacs
3 ;; Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1996, 1997, 1998,
4 ;; 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
5 ;; 2010, 2011 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.
788 With numeric arg N, put point N/10 of the way from the beginning.
789 If the buffer is narrowed, this command uses the beginning of the
790 accessible part of the buffer.
792 If Transient Mark mode is disabled, leave mark at previous
795 Don't use this command in Lisp programs!
796 \(goto-char (point-min)) is faster."
805 ;; Avoid overflow for large buffer sizes!
813 "Move point to the end of the buffer.
814 With numeric arg N, put point N/10 of the way from the end.
815 If the buffer is narrowed, this command uses the end of the
816 accessible part of the buffer.
818 If Transient Mark mode is disabled, leave mark at previous
821 Don't use this command in Lisp programs!
822 \(goto-char (point-max)) is faster."
829 ;; Avoid overflow for large buffer sizes!
834 ;; If we went to a place in the middle of the buffer,
835 ;; adjust it to the beginning of a line.
838 ;; If the end of the buffer is not already on the screen,
839 ;; then scroll specially to put it near, but not at, the bottom.
844 "Put point at beginning and mark at end of buffer.
845 You probably should not use this function in Lisp programs;
846 it is usually a mistake for a Lisp function to use any subroutine
847 that uses or sets the mark."
852 \f
854 ;; Counting lines, one way or another.
857 "Goto LINE, counting from line 1 at beginning of buffer.
858 Normally, move point in the current buffer, and leave mark at the
860 move point in the most recently selected other buffer, and switch to it.
862 If there's a number in the buffer at point, it is the default for LINE.
864 This function is usually the wrong thing to use in a Lisp program.
865 What you probably want instead is something like:
866 (goto-char (point-min)) (forward-line (1- N))
867 If at all possible, an even better solution is to use char counts
868 rather than line counts."
872 ;; Look for a default, a number in the buffer at point.
881 ;; Decide if we're switching buffers.
889 ;; Read the argument, offering that number (if any) as default.
892 buffer-prompt
893 default)
894 nil nil t
895 'minibuffer-history
896 default)
897 buffer))))
898 ;; Switch to the desired buffer, one way or another.
903 ;; Leave mark at previous position
905 ;; Move to the specified line number in that buffer.
914 "Print number of lines and characters in the region."
920 "Print the current buffer line number and narrowed line number of point."
933 "Return number of lines between START and END.
934 This is usually the number of newlines between them,
935 but can be one more if START is not equal to END
936 and the greater of them is not at the start of a line."
952 done)))
956 "Return (narrowed) buffer line number at position POS.
957 If POS is nil, use current buffer location.
958 Counting starts at (point-min), so the value refers
959 to the contents of the accessible portion of the buffer."
969 "Print info on cursor position (on screen and within buffer).
970 Also describe the character after point, and give its character code
971 in octal, decimal and hex.
973 For a non-ASCII multibyte character, also give its encoding in the
974 buffer's selected coding system if the coding system encodes the
975 character safely. If the character is encoded into one byte, that
976 code is shown in hex. If the character is encoded into more than one
979 In addition, with prefix argument, show details about that character
980 in *Help* buffer. See also the command `describe-char'."
988 ;; Avoid overflow from multiplying by 100!
992 ""
998 pos total percent beg end col hscroll)
1000 pos total col hscroll))
1002 encoded encoding-msg display-prop under-display)
1009 ;; Check if the character is displayed with some `display'
1010 ;; text property. In that case, set under-display to the
1011 ;; buffer substring covered by that property.
1022 under-display)))
1028 char char char under-display)
1030 char char char under-display display-prop))
1033 char char char
1035 "..."
1039 ;; We show the detailed information about CHAR.
1046 encoding-msg pos total percent beg end col hscroll)
1053 encoding-msg pos total percent col hscroll))))))
1054 \f
1055 ;; Initialize read-expression-map. It is defined at C level.
1067 "The current default value or list of default values in the minibuffer.
1068 The functions `read-from-minibuffer' and `completing-read' bind
1072 "Value for `print-level' while printing value in `eval-expression'.
1073 A value of nil means no limit."
1079 "Value for `print-length' while printing value in `eval-expression'.
1080 A value of nil means no limit."
1086 "If non-nil set `debug-on-error' to t in `eval-expression'.
1087 If nil, don't change the value of `debug-on-error'."
1093 "Format VALUE as a result of evaluated expression.
1094 Return a formatted string which is displayed in the echo area
1095 in addition to the value printed by prin1 in functions which
1096 display the result of expression evaluation."
1109 ;; We define this, rather than making `eval' interactive,
1110 ;; for the sake of completion of names like eval-region, eval-buffer.
1113 "Evaluate EVAL-EXPRESSION-ARG and print value in the echo area.
1114 Value is also consed on to front of the variable `values'.
1115 Optional argument EVAL-EXPRESSION-INSERT-VALUE non-nil (interactively,
1116 with prefix argument) means insert the result into the current buffer
1117 instead of printing it in the echo area. Truncates long output
1118 according to the value of the variables `eval-expression-print-length'
1119 and `eval-expression-print-level'.
1121 If `eval-expression-debug-on-error' is non-nil, which is the default,
1122 this command arranges for all errors to enter the debugger."
1126 nil read-expression-map t
1128 current-prefix-arg))
1133 ;; Bind debug-on-error to something unique so that we can
1134 ;; detect when evaled code changes it.
1138 ;; If evaled code has changed the value of debug-on-error,
1139 ;; propagate that change to the global binding.
1155 "Prompting with PROMPT, let user edit COMMAND and eval result.
1156 COMMAND is a Lisp expression. Let user edit that expression in
1157 the minibuffer, then read and evaluate the result."
1164 read-expression-map t
1166 ;; If command was added to command-history as a string,
1167 ;; get rid of that. We want only evaluable expressions there.
1171 ;; If command to be redone does not match front of history,
1172 ;; add it to the history.
1178 "Edit and re-evaluate last complex command, or ARGth from last.
1179 A complex command is one which used the minibuffer.
1180 The command is placed in the minibuffer as a Lisp form for editing.
1181 The result is executed, repeating the command as changed.
1182 If the command has been changed or is not the most recent previous
1183 command it is added to the front of the command history.
1184 You can use the minibuffer history commands \
1186 to get different commands to edit and resubmit."
1189 newcmd)
1201 ;; If command was added to command-history as a
1202 ;; string, get rid of that. We want only
1203 ;; evaluable expressions there.
1207 ;; If command to be redone does not match front of history,
1208 ;; add it to the history.
1215 \f
1217 "Default minibuffer history list.
1218 This is used for all minibuffer input
1219 except when an alternate history list is specified.
1221 Maximum length of the history list is determined by the value
1224 "Control whether history list elements are expressions or strings.
1225 If the value of this variable equals current minibuffer depth,
1226 they are expressions; otherwise they are strings.
1227 \(That convention is designed to do the right thing for
1234 "Text that was in this minibuffer before any history commands.
1235 This is nil if there have not yet been any history commands
1244 "A point-motion hook for the minibuffer, that moves point out of the prompt."
1248 "Minibuffer history variables for which matching should ignore case.
1249 If a history variable is a member of this list, then the
1251 commands ignore case when searching it, regardless of `case-fold-search'."
1256 "Find the previous history element that matches REGEXP.
1257 \(Previous history elements refer to earlier actions.)
1258 With prefix argument N, search for Nth previous match.
1259 If N is negative, find the next or Nth next match.
1260 Normally, history elements are matched case-insensitively if
1261 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1262 makes the search case-sensitive.
1263 See also `minibuffer-history-case-insensitive-variables'."
1267 nil
1268 minibuffer-local-map
1269 nil
1270 'minibuffer-history-search-history
1272 ;; Use the last regexp specified, by default, if input is empty.
1277 regexp)
1287 ;; On some systems, ignore case for file names.
1289 minibuffer-history-case-insensitive-variables)
1290 t
1291 ;; Respect the user's setting for case-fold-search:
1292 case-fold-search)
1293 nil))
1294 prevpos
1295 match-string
1296 match-offset
1303 "No later matching history item"
1324 next-matching-history-element))
1328 "Find the next history element that matches REGEXP.
1329 \(The next history element refers to a more recent action.)
1330 With prefix argument N, search for Nth next match.
1331 If N is negative, find the previous or Nth previous match.
1332 Normally, history elements are matched case-insensitively if
1333 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1334 makes the search case-sensitive."
1338 nil
1339 minibuffer-local-map
1340 nil
1341 'minibuffer-history-search-history
1343 ;; Use the last regexp specified, by default, if input is empty.
1348 regexp)
1355 "Function run by `goto-history-element' before consuming default values.
1356 This is useful to dynamically add more elements to the list of default values
1357 when `goto-history-element' reaches the end of this list.
1358 Before calling this function `goto-history-element' sets the variable
1359 `minibuffer-default-add-done' to t, so it will call this function only
1360 once. In special cases, when this function needs to be called more
1361 than once, it can set `minibuffer-default-add-done' to nil explicitly,
1365 "When nil, add more elements to the end of the list of default values.
1366 The value nil causes `goto-history-element' to add more elements to
1367 the list of defaults when it reaches the end of this list. It does
1373 "Return a list of all completions without the default value.
1374 This function is used to add all elements of the completion table to
1375 the end of the list of defaults just after the default value."
1378 minibuffer-completion-table
1379 minibuffer-completion-predicate)))
1385 "Puts element of the minibuffer history in the minibuffer.
1386 The argument NABS specifies the absolute history position."
1400 elt minibuffer-returned-to-present)
1412 previous-history-element))
1424 minibuffer-default)))
1436 elt))
1440 "Puts next element of the minibuffer history in the minibuffer.
1441 With argument N, it uses the Nth following element."
1447 "Puts previous element of the minibuffer history in the minibuffer.
1448 With argument N, it uses the Nth previous element."
1454 "Get next history element which completes the minibuffer before the point.
1455 The contents of the minibuffer after the point are deleted, and replaced
1456 by the new completion."
1462 n)
1463 ;; next-matching-history-element always puts us at (point-min).
1464 ;; Move to the position we were at before changing the buffer contents.
1465 ;; This is still sensical, because the text before point has not changed.
1469 "\
1470 Get previous history element which completes the minibuffer before the point.
1471 The contents of the minibuffer after the point are deleted, and replaced
1472 by the new completion."
1476 ;; For compatibility with the old subr of the same name.
1478 "Return the display width of the minibuffer prompt.
1479 Return 0 if current buffer is not a minibuffer."
1480 ;; Return the width of everything before the field at the end of
1481 ;; the buffer; this should be 0 for normal buffers.
1483 \f
1484 ;; isearch minibuffer history
1491 "Set up a minibuffer for using isearch to search the minibuffer history.
1492 Intended to be added to `minibuffer-setup-hook'."
1504 "Clean up the minibuffer after terminating isearch in the minibuffer."
1509 "Return the proper search function, for isearch in minibuffer history."
1516 ;; Use standard functions to search within minibuffer text
1522 found)
1523 ;; Avoid lazy-highlighting matches in the minibuffer prompt when
1524 ;; searching forward. Lazy-highlight calls this lambda with the
1525 ;; bound arg, so skip the minibuffer prompt.
1529 ;; 1. First try searching in the initial minibuffer text
1532 noerror)
1533 ;; 2. If the above search fails, start putting next/prev history
1534 ;; elements in the minibuffer successively, and search the string
1535 ;; in them. Do this only when bound is nil (i.e. not while
1536 ;; lazy-highlighting search strings in the current minibuffer text).
1548 ;; After putting the next/prev history element, search
1549 ;; the string in them again, until next-history-element
1550 ;; or previous-history-element raises an error at the
1551 ;; beginning/end of history.
1554 ;; For backward search, don't search
1555 ;; in the minibuffer prompt
1557 noerror)))
1558 ;; Return point of the new search result
1560 ;; Return nil when next(prev)-history-element fails
1564 "Display the minibuffer history search prompt.
1565 If there are no search errors, this function displays an overlay with
1566 the isearch prompt which replaces the original minibuffer prompt.
1567 Otherwise, it displays the standard isearch message returned from
1568 `isearch-message'."
1570 ;; Use standard function `isearch-message' when not in the minibuffer,
1571 ;; or search fails, or has an error (like incomplete regexp).
1572 ;; This function overwrites minibuffer text with isearch message,
1573 ;; so it's possible to see what is wrong in the search string.
1575 ;; Otherwise, put the overlay with the standard isearch prompt over
1576 ;; the initial minibuffer prompt.
1585 ;; And clear any previous isearch message.
1589 "Wrap the minibuffer history search when search fails.
1590 Move point to the first history element for a forward search,
1591 or to the last history element for a backward search."
1593 ;; When `minibuffer-history-isearch-search' fails on reaching the
1594 ;; beginning/end of the history, wrap the search to the first/last
1595 ;; minibuffer history element.
1603 "Save a function restoring the state of minibuffer history search.
1604 Save `minibuffer-history-position' to the additional state parameter
1605 in the search status stack."
1610 "Restore the minibuffer history search state.
1611 Go to the history element by the absolute history position HIST-POS."
1614 \f
1615 ;Put this on C-x u, so we can force that rather than C-_ into startup msg
1619 "Table mapping redo records to the corresponding undo one.
1620 A redo record for undo-in-region maps to t.
1630 "Within a run of consecutive undo commands, list remaining to be undone.
1634 "Undo some previous changes.
1635 Repeat this command to undo more changes.
1636 A numeric ARG serves as a repeat count.
1638 In Transient Mark mode when the mark is active, only undo changes within
1640 as an argument limits undo to changes within the current region."
1642 ;; Make last-command indicate for the next command that this was an undo.
1643 ;; That way, another undo will undo more.
1644 ;; If we get to the end of the undo history and get an error,
1645 ;; another undo command will find the undo history empty
1646 ;; and will get another error. To begin undoing the undos,
1647 ;; you must type some other command.
1650 message)
1651 ;; If we get an error in undo-start,
1652 ;; the next command should not be a "consecutive undo".
1653 ;; So set `this-command' to something other than `undo'.
1658 ;; If something (a timer or filter?) changed the buffer
1659 ;; since the previous command, don't continue the undo seq.
1663 ;; If the last undo record made was made by undo
1664 ;; it shows nothing else happened in between.
1671 ;; get rid of initial undo boundary
1673 ;; If we got this far, the next command should be a consecutive undo.
1675 ;; Check to see whether we're hitting a redo record, and if
1676 ;; so, ask the user whether she wants to skip the redo/undo pair.
1683 ;; The equiv entry might point to another redo record if we have done
1684 ;; undo-redo-undo-redo-... so skip to the very last equiv.
1692 ;; Record the fact that the just-generated undo records come from an
1693 ;; undo operation--that is, they are redo records.
1694 ;; In the ordinary case (not within a region), map the redo
1695 ;; record to the following undos.
1696 ;; I don't know how to do that in the undo-in-region case.
1698 ;; Strip any leading undo boundaries there might be, like we do
1699 ;; above when checking.
1703 undo-equiv-table))
1704 ;; Don't specify a position in the undo record for the undo command.
1705 ;; Instead, undoing this should move point to where the change is.
1724 ;; Record what the current undo list says,
1725 ;; so the next command can tell if the buffer was modified in between.
1728 ;; Display a message announcing success.
1733 "Make BUFFER stop keeping undo information.
1734 No argument or nil as argument means do this for the current buffer."
1740 "Undo some previous changes.
1741 Repeat this command to undo more changes.
1742 A numeric ARG serves as a repeat count.
1743 Contrary to `undo', this will not redo a previous undo."
1748 "Non-nil while performing an undo.
1752 "Undo back N undo-boundaries beyond what was already undone recently.
1753 Call `undo-start' to get ready to undo recent changes,
1754 then call `undo-more' one or more times to undo them."
1759 ;; Note: The following, while pulling elements off
1760 ;; `pending-undo-list' will call primitive change functions which
1761 ;; will push more elements onto `buffer-undo-list'.
1766 ;; Deep copy of a list
1768 "Make a copy of undo list LIST."
1774 elt))
1777 "Set `pending-undo-list' to the front of the undo list.
1778 The next call to `undo-more' will undo the most recently made change.
1779 If BEG and END are specified, then only undo elements
1780 that apply to text between BEG and END are used; other undo elements
1781 are ignored. If BEG and END are nil, all undo elements are used."
1787 buffer-undo-list)))
1792 "Return a list of undo elements for the region START to END.
1793 The elements come from `buffer-undo-list', but we keep only
1794 the elements inside this region, and discard those outside this region.
1795 If we find an element that crosses an edge of this region,
1796 we stop and ignore all further elements."
1799 undo-adjusted-markers
1800 some-rejected
1801 undo-elt undo-elt temp-undo-list delta)
1806 ;; This is a "was unmodified" element.
1807 ;; Keep it if we have kept everything thus far.
1814 ;; Don't put two nils together in the list
1828 ;; Loop down the earlier events adjusting their buffer
1829 ;; positions to reflect the fact that a change to the buffer
1830 ;; isn't being undone. We only need to process those element
1831 ;; types which undo-elt-in-region will return as being in
1832 ;; the region since only those types can ever get into the
1833 ;; output
1842 ;; (TEXT . POSITION)
1849 ;; (BEGIN . END)
1854 ;; (nil PROPERTY VALUE BEG . END)
1864 "Determine whether UNDO-ELT falls inside the region START ... END.
1865 If it crosses the edge, we return nil."
1870 t)
1872 nil)
1874 ;; (TEXT . POSITION)
1878 ;; This is a marker-adjustment element (MARKER . ADJUSTMENT).
1879 ;; See if MARKER is inside the region.
1890 ;; (nil PROPERTY VALUE BEG . END)
1895 ;; (BEGIN . END)
1900 "Test whether UNDO-ELT crosses one edge of that region START ... END.
1901 This assumes we have already decided that UNDO-ELT
1902 is not *inside* the region START...END."
1905 ;; (nil PROPERTY VALUE BEG . END)
1910 ;; (BEGIN . END)
1914 ;; Return the first affected buffer position and the delta for an undo element
1915 ;; delta is defined as the change in subsequent buffer positions if we *did*
1916 ;; the undo.
1920 ;; (TEXT . POSITION)
1923 ;; (BEGIN . END)
1930 "If non-nil ask about discarding undo info for the current command.
1931 Normally, Emacs discards the undo info for the current command if
1932 it exceeds `undo-outer-limit'. But if you set this option
1933 non-nil, it asks in the echo area whether to discard the info.
1934 If you answer no, there is a slight risk that Emacs might crash, so
1935 only do it if you really want to undo the command.
1937 This option is mainly intended for debugging. You have to be
1938 careful if you use it for other purposes. Garbage collection is
1939 inhibited while the question is asked, meaning that Emacs might
1940 leak memory. So you should make sure that you do not wait
1941 excessively long before answering the question."
1947 "If non-nil, an extra level of size that's ok in an undo item.
1948 We don't ask the user about truncating the undo list until the
1949 current item gets bigger than this amount.
1954 ;; When the first undo batch in an undo list is longer than
1955 ;; undo-outer-limit, this function gets called to warn the user that
1956 ;; the undo info for the current command was discarded. Garbage
1957 ;; collection is inhibited around the call, so it had better not do a
1958 ;; lot of consing.
1964 ;; Don't ask the question again unless it gets even bigger.
1965 ;; This applies, in particular, if the user quits from the question.
1966 ;; Such a quit quits out of GC, but something else will call GC
1967 ;; again momentarily. It will call this function again,
1968 ;; but we don't want to ask the question again.
1975 t)
1976 nil))
1981 "The undo info was discarded because it exceeded \
1982 `undo-outer-limit'.
1984 This is normal if you executed a command that made a huge change
1985 to the buffer. In that case, to prevent similar problems in the
1986 future, set `undo-outer-limit' to a value that is large enough to
1987 cover the maximum size of normal changes you expect a single
1988 command to make, but not so large that it might exceed the
1989 maximum memory allotted to Emacs.
1991 If you did not execute any such command, the situation is
1992 probably due to a bug and you should report it.
1994 You can disable the popping up of this buffer by adding the entry
1995 \(undo discard-info) to the user option `warning-suppress-types',
1999 t))
2000 \f
2002 "History list for some commands that read shell commands.
2004 Maximum length of the history list is determined by the value
2011 "*Buffer name for `shell-command' and `shell-command-on-region' error output.
2012 This buffer is used when `shell-command' or `shell-command-on-region'
2013 is run interactively. A value of nil means that output to stderr and
2020 "Return a list of all commands associated with the current file.
2021 This function is used to add all related commands retrieved by `mailcap'
2022 to the end of the list of defaults just after the default value."
2026 minibuffer-default))
2031 commands))
2041 "Dynamically complete shell command at point."
2053 map)
2057 "Read a shell command from the minibuffer.
2058 The arguments are the same as the ones of `read-from-minibuffer',
2059 except READ and KEYMAP are missing and HIST defaults
2060 to `shell-command-history'."
2066 minibuffer-local-shell-command-map
2067 nil
2069 args)))
2072 "Execute string COMMAND asynchronously in background.
2074 Like `shell-command' but if COMMAND doesn't end in ampersand, adds `&'
2075 surrounded by whitespace and executes the command asynchronously.
2076 The output appears in the buffer `*Async Shell Command*'."
2082 current-prefix-arg
2083 shell-command-default-error-buffer))
2089 "Execute string COMMAND in inferior shell; display output, if any.
2090 With prefix argument, insert the COMMAND's output at point.
2092 If COMMAND ends in ampersand, execute it asynchronously.
2093 The output appears in the buffer `*Async Shell Command*'.
2094 That buffer is in shell mode.
2096 Otherwise, COMMAND is executed synchronously. The output appears in
2097 the buffer `*Shell Command Output*'. If the output is short enough to
2098 display in the echo area (which is determined by the variables
2099 `resize-mini-windows' and `max-mini-window-height'), it is shown
2100 there, but it is nonetheless available in buffer `*Shell Command
2101 Output*' even though that buffer is not automatically displayed.
2103 To specify a coding system for converting non-ASCII characters
2105 before this command.
2107 Noninteractive callers can specify coding systems by binding
2108 `coding-system-for-read' and `coding-system-for-write'.
2110 The optional second argument OUTPUT-BUFFER, if non-nil,
2111 says to put the output in some other buffer.
2112 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
2113 If OUTPUT-BUFFER is not a buffer and not nil,
2114 insert output in current buffer. (This cannot be done asynchronously.)
2115 In either case, the buffer is first erased, and the output is
2116 inserted after point (leaving mark after it).
2118 If the command terminates without error, but generates output,
2120 the output can be displayed in the echo area or in its buffer.
2121 If the output is short enough to display in the echo area
2122 \(determined by the variable `max-mini-window-height' if
2123 `resize-mini-windows' is non-nil), it is shown there.
2124 Otherwise,the buffer containing the output is displayed.
2128 of the output.
2130 If there is no output, or if output is inserted in the current buffer,
2131 then `*Shell Command Output*' is deleted.
2133 If the optional third argument ERROR-BUFFER is non-nil, it is a buffer
2134 or buffer name to which to direct the command's standard error output.
2135 If it is nil, error output is mingled with regular output.
2136 In an interactive call, the variable `shell-command-default-error-buffer'
2137 specifies the value of ERROR-BUFFER."
2148 current-prefix-arg
2149 shell-command-default-error-buffer))
2150 ;; Look for a handler in case default-directory is a remote file name.
2158 ;; Output goes in current buffer.
2164 temporary-file-directory)))
2165 nil)))
2168 ;; We do not use -f for csh; we will not support broken use of
2169 ;; .cshrcs. Even the BSD csh manual says to use
2170 ;; "if ($?prompt) exit" before things which are not useful
2171 ;; non-interactively. Besides, if someone wants their other
2172 ;; aliases for shell commands then they can still have them.
2176 t)
2177 nil shell-command-switch command)
2184 ;; Do no formatting while reading error file,
2185 ;; because that can run a shell command, and we
2186 ;; don't want that to cause an infinite recursion.
2188 ;; Put point after the inserted errors.
2192 ;; This is like exchange-point-and-mark, but doesn't
2193 ;; activate the mark. It is cleaner to avoid activation,
2194 ;; even though the command loop would deactivate the mark
2195 ;; because we inserted text.
2199 ;; Output goes in a separate buffer.
2200 ;; Preserve the match data in case called from a program.
2203 ;; Command ending with ampersand means asynchronous.
2207 proc)
2208 ;; Remove the ampersand.
2210 ;; If will kill a process, query first.
2222 shell-command-switch command))
2226 ;; Use the comint filter for proper handling of carriage motion
2227 ;; (see `comint-inhibit-carriage-motion'),.
2229 ))
2230 ;; Otherwise, command is executed synchronously.
2232 output-buffer nil error-buffer)))))))
2236 "Display MESSAGE in the echo area if possible, otherwise in a pop-up buffer.
2237 MESSAGE may be either a string or a buffer.
2239 A buffer is displayed using `display-buffer' if MESSAGE is too long for
2240 the maximum height of the echo area, as defined by `max-mini-window-height'
2241 if `resize-mini-windows' is non-nil.
2243 Returns either the string shown in the echo area, or when a pop-up
2244 buffer is used, the window used to display it.
2246 If MESSAGE is a string, then the optional argument BUFFER-NAME is the
2247 name of the buffer used to display it in the case where a pop-up buffer
2248 is used, defaulting to `*Message*'. In the case where MESSAGE is a
2249 string and it is displayed in the echo area, it is not specified whether
2250 the contents are inserted into the buffer anyway.
2252 Optional arguments NOT-THIS-WINDOW and FRAME are as for `display-buffer',
2253 and only used if a buffer is displayed."
2255 ;; Trivial case where we can use the echo area
2259 ;; Trivial case where we can just remove single trailing newline
2262 ;; General case
2265 message
2274 0
2278 (<= lines
2282 max-mini-window-height))
2284 max-mini-window-height)
2288 ;; Don't use the echo area if the output buffer is
2289 ;; already dispayed in the selected frame.
2291 ;; Echo area
2297 ;; Buffer
2300 not-this-window frame))))))))
2303 ;; We have a sentinel to prevent insertion of a termination message
2304 ;; in the buffer itself.
2312 &optional output-buffer replace
2313 error-buffer display-error-buffer)
2314 "Execute string COMMAND in inferior shell with region as input.
2315 Normally display output (if any) in temp buffer `*Shell Command Output*';
2316 Prefix arg means replace the region with it. Return the exit code of
2317 COMMAND.
2319 To specify a coding system for converting non-ASCII characters
2321 before this command. By default, the input (from the current buffer)
2322 is encoded in the same coding system that will be used to save the file,
2323 `buffer-file-coding-system'. If the output is going to replace the region,
2324 then it is decoded from that same coding system.
2326 The noninteractive arguments are START, END, COMMAND,
2327 OUTPUT-BUFFER, REPLACE, ERROR-BUFFER, and DISPLAY-ERROR-BUFFER.
2328 Noninteractive callers can specify coding systems by binding
2329 `coding-system-for-read' and `coding-system-for-write'.
2331 If the command generates output, the output may be displayed
2332 in the echo area or in a buffer.
2333 If the output is short enough to display in the echo area
2334 \(determined by the variable `max-mini-window-height' if
2335 `resize-mini-windows' is non-nil), it is shown there. Otherwise
2336 it is displayed in the buffer `*Shell Command Output*'. The output
2337 is available in that buffer in both cases.
2339 If there is output and an error, a message about the error
2340 appears at the end of the output.
2342 If there is no output, or if output is inserted in the current buffer,
2343 then `*Shell Command Output*' is deleted.
2345 If the optional fourth argument OUTPUT-BUFFER is non-nil,
2346 that says to put the output in some other buffer.
2347 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
2348 If OUTPUT-BUFFER is not a buffer and not nil,
2349 insert output in the current buffer.
2350 In either case, the output is inserted after point (leaving mark after it).
2352 If REPLACE, the optional fifth argument, is non-nil, that means insert
2353 the output in place of text from START to END, putting point and mark
2354 around it.
2356 If optional sixth argument ERROR-BUFFER is non-nil, it is a buffer
2357 or buffer name to which to direct the command's standard error output.
2358 If it is nil, error output is mingled with regular output.
2359 If DISPLAY-ERROR-BUFFER is non-nil, display the error buffer if there
2360 were any errors. (This is always t, interactively.)
2361 In an interactive call, the variable `shell-command-default-error-buffer'
2362 specifies the value of ERROR-BUFFER."
2366 ;; Do this before calling region-beginning
2367 ;; and region-end, in case subprocess output
2368 ;; relocates them while we are in the minibuffer.
2370 ;; call-interactively recognizes region-beginning and
2371 ;; region-end specially, leaving them in the history.
2373 string
2374 current-prefix-arg
2375 current-prefix-arg
2376 shell-command-default-error-buffer
2377 t)))
2383 temporary-file-directory)))
2384 nil))
2385 exit-status)
2389 ;; Replace specified region with output from command.
2391 ;; Don't muck with mark unless REPLACE says we should.
2398 t)
2399 nil shell-command-switch command))
2400 ;; It is rude to delete a buffer which the command is not using.
2401 ;; (let ((shell-buffer (get-buffer "*Shell Command Output*")))
2402 ;; (and shell-buffer (not (eq shell-buffer (current-buffer)))
2403 ;; (kill-buffer shell-buffer)))
2404 ;; Don't muck with mark unless REPLACE says we should.
2406 ;; No prefix argument: put the output in a temp buffer,
2407 ;; replacing its entire contents.
2412 ;; If the input is the same buffer as the output,
2413 ;; delete everything but the specified region,
2414 ;; then replace that region with the output.
2420 shell-file-name t
2423 t)
2424 nil shell-command-switch
2425 command)))
2426 ;; Clear the output buffer, then run the command with
2427 ;; output there.
2438 buffer)
2439 nil shell-command-switch command)))
2440 ;; Report the output.
2450 ;; There's some output, display it
2452 ;; No output; error?
2456 "some error output"
2462 output))
2465 exit-status))
2468 exit-status output))))
2469 ;; Don't kill: there might be useful info in the undo-log.
2470 ;; (kill-buffer buffer)
2471 ))))
2479 ;; Do no formatting while reading error file,
2480 ;; because that can run a shell command, and we
2481 ;; don't want that to cause an infinite recursion.
2483 ;; Put point after the inserted errors.
2488 exit-status))
2491 "Execute shell command COMMAND and return its output as a string."
2494 standard-output
2498 "Process files synchronously in a separate process.
2499 Similar to `call-process', but may invoke a file handler based on
2500 `default-directory'. The current working directory of the
2501 subprocess is `default-directory'.
2503 File names in INFILE and BUFFER are handled normally, but file
2504 names in ARGS should be relative to `default-directory', as they
2505 are passed to the process verbatim. \(This is a difference to
2506 `call-process' which does not support file handlers for INFILE
2507 and BUFFER.\)
2509 Some file handlers might not support all variants, for example
2510 they might behave as if DISPLAY was nil, regardless of the actual
2511 value passed."
2513 lc stderr-file)
2523 display args)
2529 "Whether a call of `process-file' changes remote files.
2531 Per default, this variable is always set to `t', meaning that a
2532 call of `process-file' could potentially change any file on a
2533 remote host. When set to `nil', a file handler could optimize
2534 its behaviour with respect to remote file attributes caching.
2536 This variable should never be changed by `setq'. Instead of, it
2540 "Start a program in a subprocess. Return the process object for it.
2542 Similar to `start-process', but may invoke a file handler based on
2543 `default-directory'. See Info node `(elisp)Magic File Names'.
2545 This handler ought to run PROGRAM, perhaps on the local host,
2546 perhaps on a remote host that corresponds to `default-directory'.
2547 In the latter case, the local part of `default-directory' becomes
2548 the working directory of the process.
2550 PROGRAM and PROGRAM-ARGS might be file names. They are not
2551 objects of file handler invocation. File handlers might not
2552 support pty association, if PROGRAM is nil."
2557 \f
2561 (define-key map (vector meta-prefix-char t) 'universal-argument-other-key)
2562 (define-key map [switch-frame] nil)
2563 (define-key map [?\C-u] 'universal-argument-more)
2564 (define-key map [?-] 'universal-argument-minus)
2565 (define-key map [?0] 'digit-argument)
2566 (define-key map [?1] 'digit-argument)
2567 (define-key map [?2] 'digit-argument)
2568 (define-key map [?3] 'digit-argument)
2569 (define-key map [?4] 'digit-argument)
2570 (define-key map [?5] 'digit-argument)
2571 (define-key map [?6] 'digit-argument)
2572 (define-key map [?7] 'digit-argument)
2573 (define-key map [?8] 'digit-argument)
2574 (define-key map [?9] 'digit-argument)
2575 (define-key map [kp-0] 'digit-argument)
2576 (define-key map [kp-1] 'digit-argument)
2577 (define-key map [kp-2] 'digit-argument)
2578 (define-key map [kp-3] 'digit-argument)
2579 (define-key map [kp-4] 'digit-argument)
2580 (define-key map [kp-5] 'digit-argument)
2581 (define-key map [kp-6] 'digit-argument)
2582 (define-key map [kp-7] 'digit-argument)
2583 (define-key map [kp-8] 'digit-argument)
2584 (define-key map [kp-9] 'digit-argument)
2585 (define-key map [kp-subtract] 'universal-argument-minus)
2586 map)
2589 (defvar universal-argument-num-events nil
2590 "Number of argument-specifying events read by `universal-argument'.
2591 `universal-argument-other-key' uses this to discard those events
2592 from (this-command-keys), and reread only the final command.")
2594 (defvar overriding-map-is-bound nil
2595 "Non-nil when `overriding-terminal-local-map' is `universal-argument-map'.")
2597 (defvar saved-overriding-map nil
2598 "The saved value of `overriding-terminal-local-map'.
2602 (defun ensure-overriding-map-is-bound ()
2603 "Check `overriding-terminal-local-map' is `universal-argument-map'."
2604 (unless overriding-map-is-bound
2605 (setq saved-overriding-map overriding-terminal-local-map)
2606 (setq overriding-terminal-local-map universal-argument-map)
2607 (setq overriding-map-is-bound t)))
2609 (defun restore-overriding-map ()
2610 "Restore `overriding-terminal-local-map' to its saved value."
2611 (setq overriding-terminal-local-map saved-overriding-map)
2612 (setq overriding-map-is-bound nil))
2614 (defun universal-argument ()
2615 "Begin a numeric argument for the following command.
2620 multiplies the argument by 4 each time.
2622 which is different in effect from any particular numeric argument.
2624 (interactive)
2625 (setq prefix-arg (list 4))
2626 (setq universal-argument-num-events (length (this-command-keys)))
2627 (ensure-overriding-map-is-bound))
2629 ;; A subsequent C-u means to multiply the factor by 4 if we've typed
2630 ;; nothing but C-u's; otherwise it means to terminate the prefix arg.
2631 (defun universal-argument-more (arg)
2632 (interactive "P")
2633 (if (consp arg)
2634 (setq prefix-arg (list (* 4 (car arg))))
2635 (if (eq arg '-)
2636 (setq prefix-arg (list -4))
2637 (setq prefix-arg arg)
2638 (restore-overriding-map)))
2639 (setq universal-argument-num-events (length (this-command-keys))))
2641 (defun negative-argument (arg)
2642 "Begin a negative numeric argument for the next command.
2644 (interactive "P")
2645 (cond ((integerp arg)
2646 (setq prefix-arg (- arg)))
2647 ((eq arg '-)
2648 (setq prefix-arg nil))
2649 (t
2650 (setq prefix-arg '-)))
2651 (setq universal-argument-num-events (length (this-command-keys)))
2652 (ensure-overriding-map-is-bound))
2654 (defun digit-argument (arg)
2655 "Part of the numeric argument for the next command.
2657 (interactive "P")
2658 (let* ((char (if (integerp last-command-event)
2659 last-command-event
2660 (get last-command-event 'ascii-character)))
2662 (cond ((integerp arg)
2663 (setq prefix-arg (+ (* arg 10)
2664 (if (< arg 0) (- digit) digit))))
2665 ((eq arg '-)
2666 ;; Treat -0 as just -, so that -01 will work.
2667 (setq prefix-arg (if (zerop digit) '- (- digit))))
2668 (t
2669 (setq prefix-arg digit))))
2670 (setq universal-argument-num-events (length (this-command-keys)))
2671 (ensure-overriding-map-is-bound))
2673 ;; For backward compatibility, minus with no modifiers is an ordinary
2674 ;; command if digits have already been entered.
2675 (defun universal-argument-minus (arg)
2676 (interactive "P")
2677 (if (integerp arg)
2678 (universal-argument-other-key arg)
2679 (negative-argument arg)))
2681 ;; Anything else terminates the argument and is left in the queue to be
2682 ;; executed as a command.
2683 (defun universal-argument-other-key (arg)
2684 (interactive "P")
2685 (setq prefix-arg arg)
2686 (let* ((key (this-command-keys))
2687 (keylist (listify-key-sequence key)))
2688 (setq unread-command-events
2689 (append (nthcdr universal-argument-num-events keylist)
2690 unread-command-events)))
2691 (reset-this-command-lengths)
2692 (restore-overriding-map))
2693 \f
2694 (defvar buffer-substring-filters nil
2695 "List of filter functions for `filter-buffer-substring'.
2696 Each function must accept a single argument, a string, and return
2697 a string. The buffer substring is passed to the first function
2698 in the list, and the return value of each function is passed to
2699 the next. The return value of the last function is used as the
2700 return value of `filter-buffer-substring'.
2702 If this variable is nil, no filtering is performed.")
2704 (defun filter-buffer-substring (beg end &optional delete noprops)
2705 "Return the buffer substring between BEG and END, after filtering.
2706 The buffer substring is passed through each of the filter
2707 functions in `buffer-substring-filters', and the value from the
2708 last filter function is returned. If `buffer-substring-filters'
2709 is nil, the buffer substring is returned unaltered.
2711 If DELETE is non-nil, the text between BEG and END is deleted
2712 from the buffer.
2714 If NOPROPS is non-nil, final string returned does not include
2715 text properties, while the string passed to the filters still
2716 includes text properties from the buffer text.
2718 Point is temporarily set to BEG before calling
2719 `buffer-substring-filters', in case the functions need to know
2720 where the text came from.
2722 This function should be used instead of `buffer-substring',
2723 `buffer-substring-no-properties', or `delete-and-extract-region'
2724 when you want to allow filtering to take place. For example,
2725 major or minor modes can use `buffer-substring-filters' to
2726 extract characters that are special to a buffer, and should not
2727 be copied into other buffers."
2728 (cond
2729 ((or delete buffer-substring-filters)
2730 (save-excursion
2731 (goto-char beg)
2732 (let ((string (if delete (delete-and-extract-region beg end)
2733 (buffer-substring beg end))))
2734 (dolist (filter buffer-substring-filters)
2735 (setq string (funcall filter string)))
2736 (if noprops
2737 (set-text-properties 0 (length string) nil string))
2738 string)))
2739 (noprops
2740 (buffer-substring-no-properties beg end))
2741 (t
2742 (buffer-substring beg end))))
2745 ;;;; Window system cut and paste hooks.
2747 (defvar interprogram-cut-function nil
2748 "Function to call to make a killed region available to other programs.
2750 Most window systems provide some sort of facility for cutting and
2751 pasting text between the windows of different programs.
2752 This variable holds a function that Emacs calls whenever text
2753 is put in the kill ring, to make the new kill available to other
2754 programs.
2756 The function takes one or two arguments.
2757 The first argument, TEXT, is a string containing
2758 the text which should be made available.
2759 The second, optional, argument PUSH, has the same meaning as the
2760 similar argument to `x-set-cut-buffer', which see.")
2762 (defvar interprogram-paste-function nil
2763 "Function to call to get text cut from other programs.
2765 Most window systems provide some sort of facility for cutting and
2766 pasting text between the windows of different programs.
2767 This variable holds a function that Emacs calls to obtain
2768 text that other programs have provided for pasting.
2770 The function should be called with no arguments. If the function
2771 returns nil, then no other program has provided such text, and the top
2772 of the Emacs kill ring should be used. If the function returns a
2773 string, then the caller of the function \(usually `current-kill')
2774 should put this string in the kill ring as the latest kill.
2776 This function may also return a list of strings if the window
2777 system supports multiple selections. The first string will be
2778 used as the pasted text, but the other will be placed in the
2779 kill ring for easy access via `yank-pop'.
2781 Note that the function should return a string only if a program other
2782 than Emacs has provided a string for pasting; if Emacs provided the
2783 most recent string, the function should return nil. If it is
2784 difficult to tell whether Emacs or some other program provided the
2785 current string, it is probably good enough to return nil if the string
2786 is equal (according to `string=') to the last text Emacs provided.")
2787 \f
2790 ;;;; The kill ring data structure.
2792 (defvar kill-ring nil
2793 "List of killed text sequences.
2794 Since the kill ring is supposed to interact nicely with cut-and-paste
2795 facilities offered by window systems, use of this variable should
2796 interact nicely with `interprogram-cut-function' and
2797 `interprogram-paste-function'. The functions `kill-new',
2798 `kill-append', and `current-kill' are supposed to implement this
2799 interaction; you may want to use them instead of manipulating the kill
2800 ring directly.")
2802 (defcustom kill-ring-max 60
2803 "Maximum length of kill ring before oldest elements are thrown away."
2804 :type 'integer
2805 :group 'killing)
2807 (defvar kill-ring-yank-pointer nil
2808 "The tail of the kill ring whose car is the last thing yanked.")
2810 (defcustom save-interprogram-paste-before-kill nil
2811 "Save clipboard strings into kill ring before replacing them.
2812 When one selects something in another program to paste it into Emacs,
2813 but kills something in Emacs before actually pasting it,
2814 this selection is gone unless this variable is non-nil,
2815 in which case the other program's selection is saved in the `kill-ring'
2817 :type 'boolean
2818 :group 'killing
2819 :version "23.2")
2821 (defcustom kill-do-not-save-duplicates nil
2822 "Do not add a new string to `kill-ring' when it is the same as the last one."
2823 :type 'boolean
2824 :group 'killing
2825 :version "23.2")
2827 (defun kill-new (string &optional replace yank-handler)
2828 "Make STRING the latest kill in the kill ring.
2829 Set `kill-ring-yank-pointer' to point to it.
2830 If `interprogram-cut-function' is non-nil, apply it to STRING.
2831 Optional second argument REPLACE non-nil means that STRING will replace
2832 the front of the kill ring, rather than being added to the list.
2834 When `save-interprogram-paste-before-kill' and `interprogram-paste-function'
2835 are non-nil, saves the interprogram paste string(s) into `kill-ring' before
2836 STRING.
2838 When the yank handler has a non-nil PARAM element, the original STRING
2839 argument is not used by `insert-for-yank'. However, since Lisp code
2840 may access and use elements from the kill ring directly, the STRING
2842 (if (> (length string) 0)
2843 (if yank-handler
2844 (put-text-property 0 (length string)
2845 'yank-handler yank-handler string))
2846 (if yank-handler
2847 (signal 'args-out-of-range
2848 (list string "yank-handler specified for empty string"))))
2849 (when (and kill-do-not-save-duplicates
2850 (equal string (car kill-ring)))
2851 (setq replace t))
2852 (if (fboundp 'menu-bar-update-yank-menu)
2853 (menu-bar-update-yank-menu string (and replace (car kill-ring))))
2854 (when save-interprogram-paste-before-kill
2855 (let ((interprogram-paste (and interprogram-paste-function
2856 (funcall interprogram-paste-function))))
2857 (when interprogram-paste
2858 (if (listp interprogram-paste)
2859 (dolist (s (nreverse interprogram-paste))
2860 (push s kill-ring))
2861 (push interprogram-paste kill-ring)))))
2862 (if (and replace kill-ring)
2863 (setcar kill-ring string)
2864 (push string kill-ring)
2865 (if (> (length kill-ring) kill-ring-max)
2866 (setcdr (nthcdr (1- kill-ring-max) kill-ring) nil)))
2867 (setq kill-ring-yank-pointer kill-ring)
2868 (if interprogram-cut-function
2869 (funcall interprogram-cut-function string (not replace))))
2870 (set-advertised-calling-convention
2871 'kill-new '(string &optional replace) "23.3")
2873 (defun kill-append (string before-p &optional yank-handler)
2874 "Append STRING to the end of the latest kill in the kill ring.
2875 If BEFORE-P is non-nil, prepend STRING to the kill.
2876 If `interprogram-cut-function' is set, pass the resulting kill to it."
2877 (let* ((cur (car kill-ring)))
2878 (kill-new (if before-p (concat string cur) (concat cur string))
2879 (or (= (length cur) 0)
2880 (equal yank-handler (get-text-property 0 'yank-handler cur)))
2881 yank-handler)))
2882 (set-advertised-calling-convention 'kill-append '(string before-p) "23.3")
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 (purecopy "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 Lisp programs should use this function for killing text.
2957 (To delete text, use `delete-region'.)
2958 Supply two arguments, character positions indicating the stretch of text
2959 to be killed.
2961 If the previous command was also a kill command,
2962 the text killed this time appends to the text killed last time
2963 to make one entry in the kill ring."
2964 ;; Pass point first, then mark, because the order matters
2965 ;; when calling kill-append.
2966 (interactive (list (point) (mark)))
2967 (unless (and beg end)
2968 (error "The mark is not set now, so there is no region"))
2969 (condition-case nil
2970 (let ((string (filter-buffer-substring beg end t)))
2971 (when string ;STRING is nil if BEG = END
2972 ;; Add that string to the kill ring, one way or another.
2973 (if (eq last-command 'kill-region)
2974 (kill-append string (< end beg) yank-handler)
2975 (kill-new string nil yank-handler)))
2976 (when (or string (eq last-command 'kill-region))
2977 (setq this-command 'kill-region))
2978 nil)
2979 ((buffer-read-only text-read-only)
2980 ;; The code above failed because the buffer, or some of the characters
2981 ;; in the region, are read-only.
2982 ;; We should beep, in case the user just isn't aware of this.
2983 ;; However, there's no harm in putting
2984 ;; the region's text in the kill ring, anyway.
2985 (copy-region-as-kill beg end)
2986 ;; Set this-command now, so it will be set even if we get an error.
2987 (setq this-command 'kill-region)
2988 ;; This should barf, if appropriate, and give us the correct error.
2989 (if kill-read-only-ok
2990 (progn (message "Read only text copied to kill ring") nil)
2991 ;; Signal an error if the buffer is read-only.
2992 (barf-if-buffer-read-only)
2993 ;; If the buffer isn't read-only, the text is.
2994 (signal 'text-read-only (list (current-buffer)))))))
2995 (set-advertised-calling-convention 'kill-region '(beg end) "23.3")
2997 ;; copy-region-as-kill no longer sets this-command, because it's confusing
2998 ;; to get two copies of the text when the user accidentally types M-w and
2999 ;; then corrects it with the intended C-w.
3000 (defun copy-region-as-kill (beg end)
3001 "Save the region as if killed, but don't kill it.
3002 In Transient Mark mode, deactivate the mark.
3003 If `interprogram-cut-function' is non-nil, also save the text for a window
3004 system cut and paste.
3006 This command's old key binding has been given to `kill-ring-save'."
3007 (interactive "r")
3008 (if (eq last-command 'kill-region)
3009 (kill-append (filter-buffer-substring beg end) (< end beg))
3010 (kill-new (filter-buffer-substring beg end)))
3011 (setq deactivate-mark t)
3012 nil)
3014 (defun kill-ring-save (beg end)
3015 "Save the region as if killed, but don't kill it.
3016 In Transient Mark mode, deactivate the mark.
3017 If `interprogram-cut-function' is non-nil, also save the text for a window
3018 system cut and paste.
3020 If you want to append the killed line to the last killed text,
3023 This command is similar to `copy-region-as-kill', except that it gives
3024 visual feedback indicating the extent of the region being copied."
3025 (interactive "r")
3026 (copy-region-as-kill beg end)
3027 ;; This use of called-interactively-p is correct
3028 ;; because the code it controls just gives the user visual feedback.
3029 (if (called-interactively-p 'interactive)
3030 (let ((other-end (if (= (point) beg) end beg))
3031 (opoint (point))
3032 ;; Inhibit quitting so we can make a quit here
3033 ;; look like a C-g typed as a command.
3034 (inhibit-quit t))
3035 (if (pos-visible-in-window-p other-end (selected-window))
3036 ;; Swap point-and-mark quickly so as to show the region that
3037 ;; was selected. Don't do it if the region is highlighted.
3038 (unless (and (region-active-p)
3039 (face-background 'region))
3040 ;; Swap point and mark.
3041 (set-marker (mark-marker) (point) (current-buffer))
3042 (goto-char other-end)
3043 (sit-for blink-matching-delay)
3044 ;; Swap back.
3045 (set-marker (mark-marker) other-end (current-buffer))
3046 (goto-char opoint)
3047 ;; If user quit, deactivate the mark
3048 ;; as C-g would as a command.
3049 (and quit-flag mark-active
3050 (deactivate-mark)))
3051 (let* ((killed-text (current-kill 0))
3052 (message-len (min (length killed-text) 40)))
3053 (if (= (point) beg)
3054 ;; Don't say "killed"; that is misleading.
3056 (substring killed-text (- message-len)))
3058 (substring killed-text 0 message-len))))))))
3060 (defun append-next-kill (&optional interactive)
3061 "Cause following command, if it kills, to append to previous kill.
3062 The argument is used for internal purposes; do not supply one."
3063 (interactive "p")
3064 ;; We don't use (interactive-p), since that breaks kbd macros.
3065 (if interactive
3066 (progn
3067 (setq this-command 'kill-region)
3068 (message "If the next command is a kill, it will append"))
3069 (setq last-command 'kill-region)))
3070 \f
3071 ;; Yanking.
3073 ;; This is actually used in subr.el but defcustom does not work there.
3074 (defcustom yank-excluded-properties
3075 '(read-only invisible intangible field mouse-face help-echo local-map keymap
3076 yank-handler follow-link fontified)
3077 "Text properties to discard when yanking.
3078 The value should be a list of text properties to discard or t,
3079 which means to discard all text properties."
3080 :type '(choice (const :tag "All" t) (repeat symbol))
3081 :group 'killing
3082 :version "22.1")
3084 (defvar yank-window-start nil)
3085 (defvar yank-undo-function nil
3086 "If non-nil, function used by `yank-pop' to delete last stretch of yanked text.
3087 Function is called with two parameters, START and END corresponding to
3088 the value of the mark and point; it is guaranteed that START <= END.
3089 Normally set from the UNDO element of a yank-handler; see `insert-for-yank'.")
3091 (defun yank-pop (&optional arg)
3092 "Replace just-yanked stretch of killed text with a different stretch.
3093 This command is allowed only immediately after a `yank' or a `yank-pop'.
3094 At such a time, the region contains a stretch of reinserted
3095 previously-killed text. `yank-pop' deletes that text and inserts in its
3096 place a different stretch of killed text.
3098 With no argument, the previous kill is inserted.
3099 With argument N, insert the Nth previous kill.
3100 If N is negative, this is a more recent kill.
3102 The sequence of kills wraps around, so that after the oldest one
3103 comes the newest one.
3105 When this command inserts killed text into the buffer, it honors
3106 `yank-excluded-properties' and `yank-handler' as described in the
3107 doc string for `insert-for-yank-1', which see."
3108 (interactive "*p")
3109 (if (not (eq last-command 'yank))
3110 (error "Previous command was not a yank"))
3111 (setq this-command 'yank)
3112 (unless arg (setq arg 1))
3113 (let ((inhibit-read-only t)
3114 (before (< (point) (mark t))))
3115 (if before
3116 (funcall (or yank-undo-function 'delete-region) (point) (mark t))
3117 (funcall (or yank-undo-function 'delete-region) (mark t) (point)))
3118 (setq yank-undo-function nil)
3119 (set-marker (mark-marker) (point) (current-buffer))
3120 (insert-for-yank (current-kill arg))
3121 ;; Set the window start back where it was in the yank command,
3122 ;; if possible.
3123 (set-window-start (selected-window) yank-window-start t)
3124 (if before
3125 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
3126 ;; It is cleaner to avoid activation, even though the command
3127 ;; loop would deactivate the mark because we inserted text.
3128 (goto-char (prog1 (mark t)
3129 (set-marker (mark-marker) (point) (current-buffer))))))
3130 nil)
3132 (defun yank (&optional arg)
3134 More precisely, reinsert the stretch of killed text most recently
3135 killed OR yanked. Put point at end, and set mark at beginning.
3136 With just \\[universal-argument] as argument, same but put point at beginning (and mark at end).
3137 With argument N, reinsert the Nth most recently killed stretch of killed
3138 text.
3140 When this command inserts killed text into the buffer, it honors
3141 `yank-excluded-properties' and `yank-handler' as described in the
3142 doc string for `insert-for-yank-1', which see.
3145 (interactive "*P")
3146 (setq yank-window-start (window-start))
3147 ;; If we don't get all the way thru, make last-command indicate that
3148 ;; for the following command.
3149 (setq this-command t)
3150 (push-mark (point))
3151 (insert-for-yank (current-kill (cond
3152 ((listp arg) 0)
3153 ((eq arg '-) -2)
3154 (t (1- arg)))))
3155 (if (consp arg)
3156 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
3157 ;; It is cleaner to avoid activation, even though the command
3158 ;; loop would deactivate the mark because we inserted text.
3159 (goto-char (prog1 (mark t)
3160 (set-marker (mark-marker) (point) (current-buffer)))))
3161 ;; If we do get all the way thru, make this-command indicate that.
3162 (if (eq this-command t)
3163 (setq this-command 'yank))
3164 nil)
3166 (defun rotate-yank-pointer (arg)
3167 "Rotate the yanking point in the kill ring.
3168 With ARG, rotate that many kills forward (or backward, if negative)."
3169 (interactive "p")
3170 (current-kill arg))
3171 \f
3172 ;; Some kill commands.
3174 ;; Internal subroutine of delete-char
3175 (defun kill-forward-chars (arg)
3176 (if (listp arg) (setq arg (car arg)))
3177 (if (eq arg '-) (setq arg -1))
3178 (kill-region (point) (+ (point) arg)))
3180 ;; Internal subroutine of backward-delete-char
3181 (defun kill-backward-chars (arg)
3182 (if (listp arg) (setq arg (car arg)))
3183 (if (eq arg '-) (setq arg -1))
3184 (kill-region (point) (- (point) arg)))
3186 (defcustom backward-delete-char-untabify-method 'untabify
3187 "The method for untabifying when deleting backward.
3188 Can be `untabify' -- turn a tab to many spaces, then delete one space;
3189 `hungry' -- delete all whitespace, both tabs and spaces;
3190 `all' -- delete all whitespace, including tabs, spaces and newlines;
3191 nil -- just delete one character."
3192 :type '(choice (const untabify) (const hungry) (const all) (const nil))
3193 :version "20.3"
3194 :group 'killing)
3196 (defun backward-delete-char-untabify (arg &optional killp)
3197 "Delete characters backward, changing tabs into spaces.
3198 The exact behavior depends on `backward-delete-char-untabify-method'.
3199 Delete ARG chars, and kill (save in kill ring) if KILLP is non-nil.
3200 Interactively, ARG is the prefix arg (default 1)
3201 and KILLP is t if a prefix arg was specified."
3203 (when (eq backward-delete-char-untabify-method 'untabify)
3204 (let ((count arg))
3205 (save-excursion
3206 (while (and (> count 0) (not (bobp)))
3208 (let ((col (current-column)))
3209 (forward-char -1)
3210 (setq col (- col (current-column)))
3211 (insert-char ?\s col)
3212 (delete-char 1)))
3213 (forward-char -1)
3214 (setq count (1- count))))))
3215 (delete-backward-char
3217 ((eq backward-delete-char-untabify-method 'all)
3219 (if skip
3220 (let ((wh (- (point) (save-excursion (skip-chars-backward skip)
3221 (point)))))
3222 (+ arg (if (zerop wh) 0 (1- wh))))
3223 arg))
3224 killp))
3226 (defun zap-to-char (arg char)
3227 "Kill up to and including ARGth occurrence of CHAR.
3228 Case is ignored if `case-fold-search' is non-nil in the current buffer.
3229 Goes backward if ARG is negative; error if CHAR not found."
3231 ;; Avoid "obsolete" warnings for translation-table-for-input.
3232 (with-no-warnings
3233 (if (char-table-p translation-table-for-input)
3234 (setq char (or (aref translation-table-for-input char) char))))
3235 (kill-region (point) (progn
3236 (search-forward (char-to-string char) nil nil arg)
3237 ; (goto-char (if (> arg 0) (1- (point)) (1+ (point))))
3238 (point))))
3240 ;; kill-line and its subroutines.
3242 (defcustom kill-whole-line nil
3243 "If non-nil, `kill-line' with no arg at beg of line kills the whole line."
3244 :type 'boolean
3245 :group 'killing)
3247 (defun kill-line (&optional arg)
3248 "Kill the rest of the current line; if no nonblanks there, kill thru newline.
3249 With prefix argument ARG, kill that many lines from point.
3250 Negative arguments kill lines backward.
3251 With zero argument, kills the text before point on the current line.
3254 a number counts as a prefix arg.
3256 To kill a whole line, when point is not at the beginning, type \
3259 If `kill-whole-line' is non-nil, then this command kills the whole line
3260 including its terminating newline, when used at the beginning of a line
3261 with no argument. As a consequence, you can always kill a whole line
3264 If you want to append the killed line to the last killed text,
3267 If the buffer is read-only, Emacs will beep and refrain from deleting
3268 the line, but put the line in the kill ring anyway. This means that
3269 you can use this command to copy text from a read-only buffer.
3270 \(If the variable `kill-read-only-ok' is non-nil, then this won't
3271 even beep.)"
3272 (interactive "P")
3273 (kill-region (point)
3274 ;; It is better to move point to the other end of the kill
3275 ;; before killing. That way, in a read-only buffer, point
3276 ;; moves across the text that is copied to the kill ring.
3277 ;; The choice has no effect on undo now that undo records
3278 ;; the value of point from before the command was run.
3279 (progn
3280 (if arg
3281 (forward-visible-line (prefix-numeric-value arg))
3282 (if (eobp)
3283 (signal 'end-of-buffer nil))
3284 (let ((end
3285 (save-excursion
3286 (end-of-visible-line) (point))))
3287 (if (or (save-excursion
3288 ;; If trailing whitespace is visible,
3289 ;; don't treat it as nothing.
3290 (unless show-trailing-whitespace
3292 (= (point) end))
3293 (and kill-whole-line (bolp)))
3294 (forward-visible-line 1)
3295 (goto-char end))))
3296 (point))))
3298 (defun kill-whole-line (&optional arg)
3299 "Kill current line.
3300 With prefix ARG, kill that many lines starting from the current line.
3301 If ARG is negative, kill backward. Also kill the preceding newline.
3303 If ARG is zero, kill current line but exclude the trailing newline."
3304 (interactive "p")
3305 (or arg (setq arg 1))
3306 (if (and (> arg 0) (eobp) (save-excursion (forward-visible-line 0) (eobp)))
3307 (signal 'end-of-buffer nil))
3308 (if (and (< arg 0) (bobp) (save-excursion (end-of-visible-line) (bobp)))
3309 (signal 'beginning-of-buffer nil))
3310 (unless (eq last-command 'kill-region)
3311 (kill-new "")
3312 (setq last-command 'kill-region))
3313 (cond ((zerop arg)
3314 ;; We need to kill in two steps, because the previous command
3315 ;; could have been a kill command, in which case the text
3316 ;; before point needs to be prepended to the current kill
3317 ;; ring entry and the text after point appended. Also, we
3318 ;; need to use save-excursion to avoid copying the same text
3319 ;; twice to the kill ring in read-only buffers.
3320 (save-excursion
3321 (kill-region (point) (progn (forward-visible-line 0) (point))))
3322 (kill-region (point) (progn (end-of-visible-line) (point))))
3323 ((< arg 0)
3324 (save-excursion
3325 (kill-region (point) (progn (end-of-visible-line) (point))))
3326 (kill-region (point)
3327 (progn (forward-visible-line (1+ arg))
3328 (unless (bobp) (backward-char))
3329 (point))))
3330 (t
3331 (save-excursion
3332 (kill-region (point) (progn (forward-visible-line 0) (point))))
3333 (kill-region (point)
3334 (progn (forward-visible-line arg) (point))))))
3336 (defun forward-visible-line (arg)
3337 "Move forward by ARG lines, ignoring currently invisible newlines only.
3338 If ARG is negative, move backward -ARG lines.
3339 If ARG is zero, move to the beginning of the current line."
3340 (condition-case nil
3341 (if (> arg 0)
3342 (progn
3343 (while (> arg 0)
3344 (or (zerop (forward-line 1))
3345 (signal 'end-of-buffer nil))
3346 ;; If the newline we just skipped is invisible,
3347 ;; don't count it.
3348 (let ((prop
3349 (get-char-property (1- (point)) 'invisible)))
3350 (if (if (eq buffer-invisibility-spec t)
3351 prop
3352 (or (memq prop buffer-invisibility-spec)
3353 (assq prop buffer-invisibility-spec)))
3354 (setq arg (1+ arg))))
3355 (setq arg (1- arg)))
3356 ;; If invisible text follows, and it is a number of complete lines,
3357 ;; skip it.
3358 (let ((opoint (point)))
3359 (while (and (not (eobp))
3360 (let ((prop
3361 (get-char-property (point) 'invisible)))
3362 (if (eq buffer-invisibility-spec t)
3363 prop
3364 (or (memq prop buffer-invisibility-spec)
3365 (assq prop buffer-invisibility-spec)))))
3366 (goto-char
3367 (if (get-text-property (point) 'invisible)
3368 (or (next-single-property-change (point) 'invisible)
3369 (point-max))
3370 (next-overlay-change (point)))))
3371 (unless (bolp)
3372 (goto-char opoint))))
3373 (let ((first t))
3374 (while (or first (<= arg 0))
3375 (if first
3376 (beginning-of-line)
3377 (or (zerop (forward-line -1))
3378 (signal 'beginning-of-buffer nil)))
3379 ;; If the newline we just moved to is invisible,
3380 ;; don't count it.
3381 (unless (bobp)
3382 (let ((prop
3383 (get-char-property (1- (point)) 'invisible)))
3384 (unless (if (eq buffer-invisibility-spec t)
3385 prop
3386 (or (memq prop buffer-invisibility-spec)
3387 (assq prop buffer-invisibility-spec)))
3388 (setq arg (1+ arg)))))
3389 (setq first nil))
3390 ;; If invisible text follows, and it is a number of complete lines,
3391 ;; skip it.
3392 (let ((opoint (point)))
3393 (while (and (not (bobp))
3394 (let ((prop
3395 (get-char-property (1- (point)) 'invisible)))
3396 (if (eq buffer-invisibility-spec t)
3397 prop
3398 (or (memq prop buffer-invisibility-spec)
3399 (assq prop buffer-invisibility-spec)))))
3400 (goto-char
3401 (if (get-text-property (1- (point)) 'invisible)
3402 (or (previous-single-property-change (point) 'invisible)
3403 (point-min))
3404 (previous-overlay-change (point)))))
3405 (unless (bolp)
3406 (goto-char opoint)))))
3407 ((beginning-of-buffer end-of-buffer)
3408 nil)))
3410 (defun end-of-visible-line ()
3411 "Move to end of current visible line."
3412 (end-of-line)
3413 ;; If the following character is currently invisible,
3414 ;; skip all characters with that same `invisible' property value,
3415 ;; then find the next newline.
3416 (while (and (not (eobp))
3417 (save-excursion
3419 (let ((prop
3420 (get-char-property (point) 'invisible)))
3421 (if (eq buffer-invisibility-spec t)
3422 prop
3423 (or (memq prop buffer-invisibility-spec)
3424 (assq prop buffer-invisibility-spec))))))
3426 (if (get-text-property (point) 'invisible)
3427 (goto-char (next-single-property-change (point) 'invisible))
3428 (goto-char (next-overlay-change (point))))
3429 (end-of-line)))
3430 \f
3431 (defun insert-buffer (buffer)
3432 "Insert after point the contents of BUFFER.
3433 Puts mark after the inserted text.
3434 BUFFER may be a buffer or a buffer name.
3436 This function is meant for the user to run interactively.
3437 Don't call it from programs: use `insert-buffer-substring' instead!"
3438 (interactive
3439 (list
3440 (progn
3441 (barf-if-buffer-read-only)
3442 (read-buffer "Insert buffer: "
3443 (if (eq (selected-window) (next-window (selected-window)))
3444 (other-buffer (current-buffer))
3445 (window-buffer (next-window (selected-window))))
3446 t))))
3447 (push-mark
3448 (save-excursion
3449 (insert-buffer-substring (get-buffer buffer))
3450 (point)))
3451 nil)
3453 (defun append-to-buffer (buffer start end)
3454 "Append to specified buffer the text of the region.
3455 It is inserted into that buffer before its point.
3457 When calling from a program, give three arguments:
3458 BUFFER (or buffer name), START and END.
3459 START and END specify the portion of the current buffer to be copied."
3460 (interactive
3461 (list (read-buffer "Append to buffer: " (other-buffer (current-buffer) t))
3462 (region-beginning) (region-end)))
3463 (let ((oldbuf (current-buffer)))
3464 (let* ((append-to (get-buffer-create buffer))
3465 (windows (get-buffer-window-list append-to t t))
3466 point)
3467 (save-excursion
3468 (with-current-buffer append-to
3469 (setq point (point))
3470 (barf-if-buffer-read-only)
3471 (insert-buffer-substring oldbuf start end)
3472 (dolist (window windows)
3473 (when (= (window-point window) point)
3474 (set-window-point window (point)))))))))
3476 (defun prepend-to-buffer (buffer start end)
3477 "Prepend to specified buffer the text of the region.
3478 It is inserted into that buffer after its point.
3480 When calling from a program, give three arguments:
3481 BUFFER (or buffer name), START and END.
3482 START and END specify the portion of the current buffer to be copied."
3484 (let ((oldbuf (current-buffer)))
3485 (with-current-buffer (get-buffer-create buffer)
3486 (barf-if-buffer-read-only)
3487 (save-excursion
3488 (insert-buffer-substring oldbuf start end)))))
3490 (defun copy-to-buffer (buffer start end)
3491 "Copy to specified buffer the text of the region.
3492 It is inserted into that buffer, replacing existing text there.
3494 When calling from a program, give three arguments:
3495 BUFFER (or buffer name), START and END.
3496 START and END specify the portion of the current buffer to be copied."
3498 (let ((oldbuf (current-buffer)))
3499 (with-current-buffer (get-buffer-create buffer)
3500 (barf-if-buffer-read-only)
3501 (erase-buffer)
3502 (save-excursion
3503 (insert-buffer-substring oldbuf start end)))))
3504 \f
3505 (put 'mark-inactive 'error-conditions '(mark-inactive error))
3506 (put 'mark-inactive 'error-message (purecopy "The mark is not active now"))
3508 (defvar activate-mark-hook nil
3509 "Hook run when the mark becomes active.
3510 It is also run at the end of a command, if the mark is active and
3511 it is possible that the region may have changed.")
3513 (defvar deactivate-mark-hook nil
3514 "Hook run when the mark becomes inactive.")
3516 (defun mark (&optional force)
3517 "Return this buffer's mark value as integer, or nil if never set.
3519 In Transient Mark mode, this function signals an error if
3520 the mark is not active. However, if `mark-even-if-inactive' is non-nil,
3521 or the argument FORCE is non-nil, it disregards whether the mark
3522 is active, and returns an integer or nil in the usual way.
3524 If you are using this in an editing command, you are most likely making
3525 a mistake; see the documentation of `set-mark'."
3526 (if (or force (not transient-mark-mode) mark-active mark-even-if-inactive)
3527 (marker-position (mark-marker))
3528 (signal 'mark-inactive nil)))
3530 (defcustom select-active-regions nil
3531 "If non-nil, an active region automatically sets the primary selection."
3532 :type 'boolean
3533 :group 'killing
3534 :version "23.1")
3536 (declare-function x-selection-owner-p "xselect.c" (&optional selection))
3538 ;; Many places set mark-active directly, and several of them failed to also
3539 ;; run deactivate-mark-hook. This shorthand should simplify.
3540 (defsubst deactivate-mark (&optional force)
3541 "Deactivate the mark by setting `mark-active' to nil.
3542 Unless FORCE is non-nil, this function does nothing if Transient
3543 Mark mode is disabled.
3544 This function also runs `deactivate-mark-hook'."
3545 (when (or transient-mark-mode force)
3546 ;; Copy the latest region into the primary selection, if desired.
3547 (and select-active-regions
3548 mark-active
3549 (display-selections-p)
3550 (x-selection-owner-p 'PRIMARY)
3551 (x-set-selection 'PRIMARY (buffer-substring-no-properties
3552 (region-beginning) (region-end))))
3553 (if (and (null force)
3554 (or (eq transient-mark-mode 'lambda)
3555 (and (eq (car-safe transient-mark-mode) 'only)
3556 (null (cdr transient-mark-mode)))))
3557 ;; When deactivating a temporary region, don't change
3558 ;; `mark-active' or run `deactivate-mark-hook'.
3559 (setq transient-mark-mode nil)
3560 (if (eq (car-safe transient-mark-mode) 'only)
3561 (setq transient-mark-mode (cdr transient-mark-mode)))
3562 (setq mark-active nil)
3563 (run-hooks 'deactivate-mark-hook))))
3565 (defun activate-mark ()
3566 "Activate the mark."
3567 (when (mark t)
3568 (setq mark-active t)
3569 (unless transient-mark-mode
3570 (setq transient-mark-mode 'lambda))
3571 (when (and select-active-regions
3572 (display-selections-p))
3573 (x-set-selection 'PRIMARY (current-buffer)))))
3575 (defun set-mark (pos)
3576 "Set this buffer's mark to POS. Don't use this function!
3577 That is to say, don't use this function unless you want
3578 the user to see that the mark has moved, and you want the previous
3579 mark position to be lost.
3581 Normally, when a new mark is set, the old one should go on the stack.
3582 This is why most applications should use `push-mark', not `set-mark'.
3584 Novice Emacs Lisp programmers often try to use the mark for the wrong
3585 purposes. The mark saves a location for the user's convenience.
3586 Most editing commands should not alter the mark.
3587 To remember a location for internal use in the Lisp program,
3588 store it in a Lisp variable. Example:
3590 (let ((beg (point))) (forward-line 1) (delete-region beg (point)))."
3592 (if pos
3593 (progn
3594 (setq mark-active t)
3595 (run-hooks 'activate-mark-hook)
3596 (when (and select-active-regions
3597 (display-selections-p))
3598 (x-set-selection 'PRIMARY (current-buffer)))
3599 (set-marker (mark-marker) pos (current-buffer)))
3600 ;; Normally we never clear mark-active except in Transient Mark mode.
3601 ;; But when we actually clear out the mark value too, we must
3602 ;; clear mark-active in any mode.
3603 (deactivate-mark t)
3604 (set-marker (mark-marker) nil)))
3606 (defcustom use-empty-active-region nil
3608 If nil, region-aware commands treat empty regions as inactive.
3609 If non-nil, region-aware commands treat the region as active as
3610 long as the mark is active, even if the region is empty.
3612 Region-aware commands are those that act on the region if it is
3613 active and Transient Mark mode is enabled, and on the text near
3614 point otherwise."
3615 :type 'boolean
3616 :version "23.1"
3617 :group 'editing-basics)
3619 (defun use-region-p ()
3620 "Return t if the region is active and it is appropriate to act on it.
3621 This is used by commands that act specially on the region under
3622 Transient Mark mode.
3624 The return value is t if Transient Mark mode is enabled and the
3625 mark is active; furthermore, if `use-empty-active-region' is nil,
3626 the region must not be empty. Otherwise, the return value is nil.
3628 For some commands, it may be appropriate to ignore the value of
3629 `use-empty-active-region'; in that case, use `region-active-p'."
3630 (and (region-active-p)
3631 (or use-empty-active-region (> (region-end) (region-beginning)))))
3633 (defun region-active-p ()
3634 "Return t if Transient Mark mode is enabled and the mark is active.
3636 Some commands act specially on the region when Transient Mark
3637 mode is enabled. Usually, such commands should use
3638 `use-region-p' instead of this function, because `use-region-p'
3639 also checks the value of `use-empty-active-region'."
3640 (and transient-mark-mode mark-active))
3642 (defvar mark-ring nil
3643 "The list of former marks of the current buffer, most recent first.")
3644 (make-variable-buffer-local 'mark-ring)
3645 (put 'mark-ring 'permanent-local t)
3647 (defcustom mark-ring-max 16
3648 "Maximum size of mark ring. Start discarding off end if gets this big."
3649 :type 'integer
3650 :group 'editing-basics)
3652 (defvar global-mark-ring nil
3653 "The list of saved global marks, most recent first.")
3655 (defcustom global-mark-ring-max 16
3656 "Maximum size of global mark ring. \
3657 Start discarding off end if gets this big."
3658 :type 'integer
3659 :group 'editing-basics)
3661 (defun pop-to-mark-command ()
3662 "Jump to mark, and pop a new position for mark off the ring.
3663 \(Does not affect global mark ring\)."
3664 (interactive)
3665 (if (null (mark t))
3666 (error "No mark set in this buffer")
3667 (if (= (point) (mark t))
3668 (message "Mark popped"))
3669 (goto-char (mark t))
3670 (pop-mark)))
3672 (defun push-mark-command (arg &optional nomsg)
3673 "Set mark at where point is.
3674 If no prefix ARG and mark is already set there, just activate it.
3675 Display `Mark set' unless the optional second arg NOMSG is non-nil."
3676 (interactive "P")
3677 (let ((mark (marker-position (mark-marker))))
3678 (if (or arg (null mark) (/= mark (point)))
3679 (push-mark nil nomsg t)
3680 (setq mark-active t)
3681 (run-hooks 'activate-mark-hook)
3682 (and select-active-regions (display-selections-p)
3683 (x-set-selection 'PRIMARY (current-buffer)))
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."
3703 :type 'boolean
3704 :group 'editing-basics
3705 :version "23.1")
3707 (defun set-mark-command (arg)
3708 "Set the mark where point is, or jump to the mark.
3709 Setting the mark also alters the region, which is the text
3710 between point and mark; this is the closest equivalent in
3713 With no prefix argument, set the mark at point, and push the
3714 old mark position on local mark ring. Also push the old mark on
3715 global mark ring, if the previous mark was set in another buffer.
3717 When Transient Mark Mode is off, immediately repeating this
3718 command activates `transient-mark-mode' temporarily.
3721 jump to the mark, and set the mark from
3722 position popped off the local mark ring \(this does not affect the global
3724 mark ring \(see `pop-global-mark'\).
3726 If `set-mark-command-repeat-pop' is non-nil, repeating
3728 off the local (or global) mark ring and jumps there.
3731 argument, unconditionally set mark where point is, even if
3732 `set-mark-command-repeat-pop' is non-nil.
3734 Novice Emacs Lisp programmers often try to use the mark for the wrong
3735 purposes. See the documentation of `set-mark' for more information."
3736 (interactive "P")
3737 (cond ((eq transient-mark-mode 'lambda)
3738 (setq transient-mark-mode nil))
3739 ((eq (car-safe transient-mark-mode) 'only)
3740 (deactivate-mark)))
3741 (cond
3742 ((and (consp arg) (> (prefix-numeric-value arg) 4))
3743 (push-mark-command nil))
3744 ((not (eq this-command 'set-mark-command))
3745 (if arg
3746 (pop-to-mark-command)
3747 (push-mark-command t)))
3748 ((and set-mark-command-repeat-pop
3749 (eq last-command 'pop-to-mark-command))
3750 (setq this-command 'pop-to-mark-command)
3751 (pop-to-mark-command))
3752 ((and set-mark-command-repeat-pop
3753 (eq last-command 'pop-global-mark)
3754 (not arg))
3755 (setq this-command 'pop-global-mark)
3756 (pop-global-mark))
3757 (arg
3758 (setq this-command 'pop-to-mark-command)
3759 (pop-to-mark-command))
3760 ((eq last-command 'set-mark-command)
3761 (if (region-active-p)
3762 (progn
3763 (deactivate-mark)
3764 (message "Mark deactivated"))
3765 (activate-mark)
3766 (message "Mark activated")))
3767 (t
3768 (push-mark-command nil)
3769 (if set-mark-default-inactive (deactivate-mark)))))
3771 (defun push-mark (&optional location nomsg activate)
3772 "Set mark at LOCATION (point, by default) and push old mark on mark ring.
3773 If the last global mark pushed was not in the current buffer,
3774 also push LOCATION on the global mark ring.
3775 Display `Mark set' unless the optional second arg NOMSG is non-nil.
3777 Novice Emacs Lisp programmers often try to use the mark for the wrong
3778 purposes. See the documentation of `set-mark' for more information.
3780 In Transient Mark mode, activate mark if optional third arg ACTIVATE non-nil."
3781 (unless (null (mark t))
3782 (setq mark-ring (cons (copy-marker (mark-marker)) mark-ring))
3783 (when (> (length mark-ring) mark-ring-max)
3784 (move-marker (car (nthcdr mark-ring-max mark-ring)) nil)
3785 (setcdr (nthcdr (1- mark-ring-max) mark-ring) nil)))
3786 (set-marker (mark-marker) (or location (point)) (current-buffer))
3787 ;; Now push the mark on the global mark ring.
3788 (if (and global-mark-ring
3789 (eq (marker-buffer (car global-mark-ring)) (current-buffer)))
3790 ;; The last global mark pushed was in this same buffer.
3791 ;; Don't push another one.
3792 nil
3793 (setq global-mark-ring (cons (copy-marker (mark-marker)) global-mark-ring))
3794 (when (> (length global-mark-ring) global-mark-ring-max)
3795 (move-marker (car (nthcdr global-mark-ring-max global-mark-ring)) nil)
3796 (setcdr (nthcdr (1- global-mark-ring-max) global-mark-ring) nil)))
3797 (or nomsg executing-kbd-macro (> (minibuffer-depth) 0)
3798 (message "Mark set"))
3799 (if (or activate (not transient-mark-mode))
3800 (set-mark (mark t)))
3801 nil)
3803 (defun pop-mark ()
3804 "Pop off mark ring into the buffer's actual mark.
3805 Does not set point. Does nothing if mark ring is empty."
3806 (when mark-ring
3807 (setq mark-ring (nconc mark-ring (list (copy-marker (mark-marker)))))
3808 (set-marker (mark-marker) (+ 0 (car mark-ring)) (current-buffer))
3809 (move-marker (car mark-ring) nil)
3810 (if (null (mark t)) (ding))
3811 (setq mark-ring (cdr mark-ring)))
3812 (deactivate-mark))
3814 (define-obsolete-function-alias
3815 'exchange-dot-and-mark 'exchange-point-and-mark "23.3")
3816 (defun exchange-point-and-mark (&optional arg)
3817 "Put the mark where point is now, and point where the mark is now.
3818 This command works even when the mark is not active,
3819 and it reactivates the mark.
3821 If Transient Mark mode is on, a prefix ARG deactivates the mark
3822 if it is active, and otherwise avoids reactivating it. If
3823 Transient Mark mode is off, a prefix ARG enables Transient Mark
3824 mode temporarily."
3825 (interactive "P")
3826 (let ((omark (mark t))
3827 (temp-highlight (eq (car-safe transient-mark-mode) 'only)))
3828 (if (null omark)
3829 (error "No mark set in this buffer"))
3830 (deactivate-mark)
3831 (set-mark (point))
3832 (goto-char omark)
3833 (if set-mark-default-inactive (deactivate-mark))
3834 (cond (temp-highlight
3835 (setq transient-mark-mode (cons 'only transient-mark-mode)))
3836 ((or (and arg (region-active-p)) ; (xor arg (not (region-active-p)))
3837 (not (or arg (region-active-p))))
3838 (deactivate-mark))
3839 (t (activate-mark)))
3840 nil))
3842 (defcustom shift-select-mode t
3843 "When non-nil, shifted motion keys activate the mark momentarily.
3845 While the mark is activated in this way, any shift-translated point
3846 motion key extends the region, and if Transient Mark mode was off, it
3847 is temporarily turned on. Furthermore, the mark will be deactivated
3848 by any subsequent point motion key that was not shift-translated, or
3849 by any action that normally deactivates the mark in Transient Mark mode.
3851 See `this-command-keys-shift-translated' for the meaning of
3852 shift-translation."
3853 :type 'boolean
3854 :group 'editing-basics)
3856 (defun handle-shift-selection ()
3857 "Activate/deactivate mark depending on invocation thru shift translation.
3858 This function is called by `call-interactively' when a command
3859 with a `^' character in its `interactive' spec is invoked, before
3860 running the command itself.
3862 If `shift-select-mode' is enabled and the command was invoked
3863 through shift translation, set the mark and activate the region
3864 temporarily, unless it was already set in this way. See
3865 `this-command-keys-shift-translated' for the meaning of shift
3866 translation.
3868 Otherwise, if the region has been activated temporarily,
3869 deactivate it, and restore the variable `transient-mark-mode' to
3870 its earlier value."
3871 (cond ((and shift-select-mode this-command-keys-shift-translated)
3872 (unless (and mark-active
3873 (eq (car-safe transient-mark-mode) 'only))
3874 (setq transient-mark-mode
3875 (cons 'only
3876 (unless (eq transient-mark-mode 'lambda)
3877 transient-mark-mode)))
3878 (push-mark nil nil t)))
3879 ((eq (car-safe transient-mark-mode) 'only)
3880 (setq transient-mark-mode (cdr transient-mark-mode))
3881 (deactivate-mark))))
3883 (define-minor-mode transient-mark-mode
3884 "Toggle Transient Mark mode.
3885 With ARG, turn Transient Mark mode on if ARG is positive, off otherwise.
3887 In Transient Mark mode, when the mark is active, the region is highlighted.
3889 So do certain other operations that set the mark
3890 but whose main purpose is something else--for example,
3896 Many commands change their behavior when Transient Mark mode is in effect
3897 and the mark is active, by acting on the region instead of their usual
3898 default part of the buffer's text. Examples of such commands include
3903 commands which are sensitive to the Transient Mark mode."
3904 :global t
3905 :init-value (not noninteractive)
3906 :initialize 'custom-initialize-delay
3907 :group 'editing-basics)
3909 ;; The variable transient-mark-mode is ugly: it can take on special
3910 ;; values. Document these here.
3911 (defvar transient-mark-mode t
3912 "*Non-nil if Transient Mark mode is enabled.
3913 See the command `transient-mark-mode' for a description of this minor mode.
3915 Non-nil also enables highlighting of the region whenever the mark is active.
3916 The variable `highlight-nonselected-windows' controls whether to highlight
3917 all windows or just the selected window.
3919 Lisp programs may give this variable certain special values:
3921 - A value of `lambda' enables Transient Mark mode temporarily.
3922 It is disabled again after any subsequent action that would
3923 normally deactivate the mark (e.g. buffer modification).
3925 - A value of (only . OLDVAL) enables Transient Mark mode
3926 temporarily. After any subsequent point motion command that is
3927 not shift-translated, or any other action that would normally
3928 deactivate the mark (e.g. buffer modification), the value of
3929 `transient-mark-mode' is set to OLDVAL.")
3931 (defvar widen-automatically t
3932 "Non-nil means it is ok for commands to call `widen' when they want to.
3933 Some commands will do this in order to go to positions outside
3934 the current accessible part of the buffer.
3936 If `widen-automatically' is nil, these commands will do something else
3937 as a fallback, and won't change the buffer bounds.")
3939 (defun pop-global-mark ()
3940 "Pop off global mark ring and jump to the top location."
3941 (interactive)
3942 ;; Pop entries which refer to non-existent buffers.
3943 (while (and global-mark-ring (not (marker-buffer (car global-mark-ring))))
3944 (setq global-mark-ring (cdr global-mark-ring)))
3945 (or global-mark-ring
3946 (error "No global mark set"))
3947 (let* ((marker (car global-mark-ring))
3948 (buffer (marker-buffer marker))
3949 (position (marker-position marker)))
3950 (setq global-mark-ring (nconc (cdr global-mark-ring)
3951 (list (car global-mark-ring))))
3952 (set-buffer buffer)
3953 (or (and (>= position (point-min))
3954 (<= position (point-max)))
3955 (if widen-automatically
3956 (widen)
3957 (error "Global mark position is outside accessible part of buffer")))
3958 (goto-char position)
3959 (switch-to-buffer buffer)))
3960 \f
3961 (defcustom next-line-add-newlines nil
3962 "If non-nil, `next-line' inserts newline to avoid `end of buffer' error."
3963 :type 'boolean
3964 :version "21.1"
3965 :group 'editing-basics)
3967 (defun next-line (&optional arg try-vscroll)
3968 "Move cursor vertically down ARG lines.
3969 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
3970 If there is no character in the target line exactly under the current column,
3971 the cursor is positioned after the character in that line which spans this
3972 column, or at the end of the line if it is not long enough.
3973 If there is no line in the buffer after this one, behavior depends on the
3974 value of `next-line-add-newlines'. If non-nil, it inserts a newline character
3975 to create a line, and moves the cursor to that line. Otherwise it moves the
3976 cursor to the end of the buffer.
3978 If the variable `line-move-visual' is non-nil, this command moves
3979 by display lines. Otherwise, it moves by buffer lines, without
3980 taking variable-width characters or continued lines into account.
3983 a semipermanent goal column for this command.
3984 Then instead of trying to move exactly vertically (or as close as possible),
3985 this command moves to the specified goal column (or as close as possible).
3986 The goal column is stored in the variable `goal-column', which is nil
3987 when there is no goal column.
3989 If you are thinking of using this in a Lisp program, consider
3990 using `forward-line' instead. It is usually easier to use
3991 and more reliable (no dependence on goal column, etc.)."
3993 (or arg (setq arg 1))
3994 (if (and next-line-add-newlines (= arg 1))
3995 (if (save-excursion (end-of-line) (eobp))
3996 ;; When adding a newline, don't expand an abbrev.
3997 (let ((abbrev-mode nil))
3998 (end-of-line)
4000 (line-move arg nil nil try-vscroll))
4001 (if (called-interactively-p 'interactive)
4002 (condition-case nil
4003 (line-move arg nil nil try-vscroll)
4004 ((beginning-of-buffer end-of-buffer) (ding)))
4005 (line-move arg nil nil try-vscroll)))
4006 nil)
4008 (defun previous-line (&optional arg try-vscroll)
4009 "Move cursor vertically up ARG lines.
4010 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
4011 If there is no character in the target line exactly over the current column,
4012 the cursor is positioned after the character in that line which spans this
4013 column, or at the end of the line if it is not long enough.
4015 If the variable `line-move-visual' is non-nil, this command moves
4016 by display lines. Otherwise, it moves by buffer lines, without
4017 taking variable-width characters or continued lines into account.
4020 a semipermanent goal column for this command.
4021 Then instead of trying to move exactly vertically (or as close as possible),
4022 this command moves to the specified goal column (or as close as possible).
4023 The goal column is stored in the variable `goal-column', which is nil
4024 when there is no goal column.
4026 If you are thinking of using this in a Lisp program, consider using
4027 `forward-line' with a negative argument instead. It is usually easier
4028 to use and more reliable (no dependence on goal column, etc.)."
4030 (or arg (setq arg 1))
4031 (if (called-interactively-p 'interactive)
4032 (condition-case nil
4033 (line-move (- arg) nil nil try-vscroll)
4034 ((beginning-of-buffer end-of-buffer) (ding)))
4035 (line-move (- arg) nil nil try-vscroll))
4036 nil)
4038 (defcustom track-eol nil
4039 "Non-nil means vertical motion starting at end of line keeps to ends of lines.
4040 This means moving to the end of each line moved onto.
4041 The beginning of a blank line does not count as the end of a line.
4042 This has no effect when `line-move-visual' is non-nil."
4043 :type 'boolean
4044 :group 'editing-basics)
4046 (defcustom goal-column nil
4048 :type '(choice integer
4049 (const :tag "None" nil))
4050 :group 'editing-basics)
4051 (make-variable-buffer-local 'goal-column)
4053 (defvar temporary-goal-column 0
4054 "Current goal column for vertical motion.
4055 It is the column where point was at the start of the current run
4056 of vertical motion commands.
4058 When moving by visual lines via `line-move-visual', it is a cons
4059 cell (COL . HSCROLL), where COL is the x-position, in pixels,
4060 divided by the default column width, and HSCROLL is the number of
4061 columns by which window is scrolled from left margin.
4063 When the `track-eol' feature is doing its job, the value is
4064 `most-positive-fixnum'.")
4066 (defcustom line-move-ignore-invisible t
4068 Outline mode sets this."
4069 :type 'boolean
4070 :group 'editing-basics)
4072 (defcustom line-move-visual t
4073 "When non-nil, `line-move' moves point by visual lines.
4074 This movement is based on where the cursor is displayed on the
4075 screen, instead of relying on buffer contents alone. It takes
4076 into account variable-width characters and line continuation.
4077 If nil, `line-move' moves point by logical lines."
4078 :type 'boolean
4079 :group 'editing-basics
4080 :version "23.1")
4082 ;; Returns non-nil if partial move was done.
4083 (defun line-move-partial (arg noerror to-end)
4084 (if (< arg 0)
4085 ;; Move backward (up).
4086 ;; If already vscrolled, reduce vscroll
4087 (let ((vs (window-vscroll nil t)))
4088 (when (> vs (frame-char-height))
4089 (set-window-vscroll nil (- vs (frame-char-height)) t)))
4091 ;; Move forward (down).
4092 (let* ((lh (window-line-height -1))
4093 (vpos (nth 1 lh))
4094 (ypos (nth 2 lh))
4095 (rbot (nth 3 lh))
4096 py vs)
4097 (when (or (null lh)
4098 (>= rbot (frame-char-height))
4099 (<= ypos (- (frame-char-height))))
4100 (unless lh
4101 (let ((wend (pos-visible-in-window-p t nil t)))
4102 (setq rbot (nth 3 wend)
4103 vpos (nth 5 wend))))
4104 (cond
4105 ;; If last line of window is fully visible, move forward.
4106 ((or (null rbot) (= rbot 0))
4107 nil)
4108 ;; If cursor is not in the bottom scroll margin, move forward.
4109 ((and (> vpos 0)
4110 (< (setq py
4111 (or (nth 1 (window-line-height))
4112 (let ((ppos (posn-at-point)))
4113 (cdr (or (posn-actual-col-row ppos)
4114 (posn-col-row ppos))))))
4115 (min (- (window-text-height) scroll-margin 1) (1- vpos))))
4116 nil)
4117 ;; When already vscrolled, we vscroll some more if we can,
4118 ;; or clear vscroll and move forward at end of tall image.
4119 ((> (setq vs (window-vscroll nil t)) 0)
4121 ;; If we are vscrolling an image at the top of the screen,
4122 ;; we could actually advance point if this yields space
4123 ;; below....
4125 (when (> rbot 0)
4126 (set-window-vscroll nil (+ vs (min rbot (frame-char-height))) t)))
4127 ;; If cursor just entered the bottom scroll margin, move forward,
4128 ;; but also vscroll one line so redisplay wont recenter.
4129 ((and (> vpos 0)
4130 (= py (min (- (window-text-height) scroll-margin 1)
4131 (1- vpos))))
4132 (set-window-vscroll nil (frame-char-height) t)
4133 (line-move-1 arg noerror to-end)
4134 t)
4135 ;; If there are lines above the last line, scroll-up one line.
4136 ((> vpos 0)
4137 (scroll-up 1)
4138 t)
4139 ;; Finally, start vscroll.
4140 (t
4141 (set-window-vscroll nil (frame-char-height) t)))))))
4144 ;; This is like line-move-1 except that it also performs
4145 ;; vertical scrolling of tall images if appropriate.
4146 ;; That is not really a clean thing to do, since it mixes
4147 ;; scrolling with cursor motion. But so far we don't have
4148 ;; a cleaner solution to the problem of making C-n do something
4149 ;; useful given a tall image.
4150 (defun line-move (arg &optional noerror to-end try-vscroll)
4151 (unless (and auto-window-vscroll try-vscroll
4152 ;; Only vscroll for single line moves
4153 (= (abs arg) 1)
4154 ;; But don't vscroll in a keyboard macro.
4155 (not defining-kbd-macro)
4156 (not executing-kbd-macro)
4157 (line-move-partial arg noerror to-end))
4158 (set-window-vscroll nil 0 t)
4159 (if line-move-visual
4160 (line-move-visual arg noerror)
4161 (line-move-1 arg noerror to-end))))
4163 ;; Display-based alternative to line-move-1.
4164 ;; Arg says how many lines to move. The value is t if we can move the
4165 ;; specified number of lines.
4166 (defun line-move-visual (arg &optional noerror)
4167 (let ((opoint (point))
4168 (hscroll (window-hscroll))
4169 target-hscroll)
4170 ;; Check if the previous command was a line-motion command, or if
4171 ;; we were called from some other command.
4172 (if (and (consp temporary-goal-column)
4173 (memq last-command `(next-line previous-line ,this-command)))
4174 ;; If so, there's no need to reset `temporary-goal-column',
4175 ;; but we may need to hscroll.
4176 (if (or (/= (cdr temporary-goal-column) hscroll)
4177 (> (cdr temporary-goal-column) 0))
4178 (setq target-hscroll (cdr temporary-goal-column)))
4179 ;; Otherwise, we should reset `temporary-goal-column'.
4180 (let ((posn (posn-at-point)))
4181 (cond
4182 ;; Handle the `overflow-newline-into-fringe' case:
4183 ((eq (nth 1 posn) 'right-fringe)
4184 (setq temporary-goal-column (cons (- (window-width) 1) hscroll)))
4185 ((car (posn-x-y posn))
4186 (setq temporary-goal-column
4187 (cons (/ (float (car (posn-x-y posn)))
4188 (frame-char-width)) hscroll))))))
4189 (if target-hscroll
4190 (set-window-hscroll (selected-window) target-hscroll))
4191 (or (and (= (vertical-motion
4192 (cons (or goal-column
4193 (if (consp temporary-goal-column)
4194 (car temporary-goal-column)
4195 temporary-goal-column))
4196 arg))
4197 arg)
4198 (or (>= arg 0)
4199 (/= (point) opoint)
4200 ;; If the goal column lies on a display string,
4201 ;; `vertical-motion' advances the cursor to the end
4202 ;; of the string. For arg < 0, this can cause the
4203 ;; cursor to get stuck. (Bug#3020).
4204 (= (vertical-motion arg) arg)))
4205 (unless noerror
4206 (signal (if (< arg 0) 'beginning-of-buffer 'end-of-buffer)
4207 nil)))))
4209 ;; This is the guts of next-line and previous-line.
4210 ;; Arg says how many lines to move.
4211 ;; The value is t if we can move the specified number of lines.
4212 (defun line-move-1 (arg &optional noerror to-end)
4213 ;; Don't run any point-motion hooks, and disregard intangibility,
4214 ;; for intermediate positions.
4215 (let ((inhibit-point-motion-hooks t)
4216 (opoint (point))
4217 (orig-arg arg))
4218 (if (consp temporary-goal-column)
4219 (setq temporary-goal-column (+ (car temporary-goal-column)
4220 (cdr temporary-goal-column))))
4221 (unwind-protect
4222 (progn
4223 (if (not (memq last-command '(next-line previous-line)))
4224 (setq temporary-goal-column
4225 (if (and track-eol (eolp)
4226 ;; Don't count beg of empty line as end of line
4227 ;; unless we just did explicit end-of-line.
4228 (or (not (bolp)) (eq last-command 'move-end-of-line)))
4229 most-positive-fixnum
4230 (current-column))))
4232 (if (not (or (integerp selective-display)
4233 line-move-ignore-invisible))
4234 ;; Use just newline characters.
4235 ;; Set ARG to 0 if we move as many lines as requested.
4236 (or (if (> arg 0)
4237 (progn (if (> arg 1) (forward-line (1- arg)))
4238 ;; This way of moving forward ARG lines
4239 ;; verifies that we have a newline after the last one.
4240 ;; It doesn't get confused by intangible text.
4241 (end-of-line)
4242 (if (zerop (forward-line 1))
4243 (setq arg 0)))
4244 (and (zerop (forward-line arg))
4245 (bolp)
4246 (setq arg 0)))
4247 (unless noerror
4248 (signal (if (< arg 0)
4249 'beginning-of-buffer
4250 'end-of-buffer)
4251 nil)))
4252 ;; Move by arg lines, but ignore invisible ones.
4253 (let (done)
4254 (while (and (> arg 0) (not done))
4255 ;; If the following character is currently invisible,
4256 ;; skip all characters with that same `invisible' property value.
4257 (while (and (not (eobp)) (invisible-p (point)))
4258 (goto-char (next-char-property-change (point))))
4259 ;; Move a line.
4260 ;; We don't use `end-of-line', since we want to escape
4261 ;; from field boundaries occurring exactly at point.
4262 (goto-char (constrain-to-field
4263 (let ((inhibit-field-text-motion t))
4264 (line-end-position))
4265 (point) t t
4266 'inhibit-line-move-field-capture))
4267 ;; If there's no invisibility here, move over the newline.
4268 (cond
4269 ((eobp)
4270 (if (not noerror)
4271 (signal 'end-of-buffer nil)
4272 (setq done t)))
4273 ((and (> arg 1) ;; Use vertical-motion for last move
4274 (not (integerp selective-display))
4275 (not (invisible-p (point))))
4276 ;; We avoid vertical-motion when possible
4277 ;; because that has to fontify.
4278 (forward-line 1))
4279 ;; Otherwise move a more sophisticated way.
4280 ((zerop (vertical-motion 1))
4281 (if (not noerror)
4282 (signal 'end-of-buffer nil)
4283 (setq done t))))
4284 (unless done
4285 (setq arg (1- arg))))
4286 ;; The logic of this is the same as the loop above,
4287 ;; it just goes in the other direction.
4288 (while (and (< arg 0) (not done))
4289 ;; For completely consistency with the forward-motion
4290 ;; case, we should call beginning-of-line here.
4291 ;; However, if point is inside a field and on a
4292 ;; continued line, the call to (vertical-motion -1)
4293 ;; below won't move us back far enough; then we return
4294 ;; to the same column in line-move-finish, and point
4295 ;; gets stuck -- cyd
4296 (forward-line 0)
4297 (cond
4298 ((bobp)
4299 (if (not noerror)
4300 (signal 'beginning-of-buffer nil)
4301 (setq done t)))
4302 ((and (< arg -1) ;; Use vertical-motion for last move
4303 (not (integerp selective-display))
4304 (not (invisible-p (1- (point)))))
4305 (forward-line -1))
4306 ((zerop (vertical-motion -1))
4307 (if (not noerror)
4308 (signal 'beginning-of-buffer nil)
4309 (setq done t))))
4310 (unless done
4311 (setq arg (1+ arg))
4312 (while (and ;; Don't move over previous invis lines
4313 ;; if our target is the middle of this line.
4314 (or (zerop (or goal-column temporary-goal-column))
4315 (< arg 0))
4316 (not (bobp)) (invisible-p (1- (point))))
4317 (goto-char (previous-char-property-change (point))))))))
4318 ;; This is the value the function returns.
4319 (= arg 0))
4321 (cond ((> arg 0)
4322 ;; If we did not move down as far as desired, at least go
4323 ;; to end of line. Be sure to call point-entered and
4324 ;; point-left-hooks.
4325 (let* ((npoint (prog1 (line-end-position)
4326 (goto-char opoint)))
4327 (inhibit-point-motion-hooks nil))
4328 (goto-char npoint)))
4329 ((< arg 0)
4330 ;; If we did not move up as far as desired,
4331 ;; at least go to beginning of line.
4332 (let* ((npoint (prog1 (line-beginning-position)
4333 (goto-char opoint)))
4334 (inhibit-point-motion-hooks nil))
4335 (goto-char npoint)))
4336 (t
4337 (line-move-finish (or goal-column temporary-goal-column)
4338 opoint (> orig-arg 0)))))))
4340 (defun line-move-finish (column opoint forward)
4341 (let ((repeat t))
4342 (while repeat
4343 ;; Set REPEAT to t to repeat the whole thing.
4344 (setq repeat nil)
4346 (let (new
4347 (old (point))
4348 (line-beg (save-excursion (beginning-of-line) (point)))
4349 (line-end
4350 ;; Compute the end of the line
4351 ;; ignoring effectively invisible newlines.
4352 (save-excursion
4353 ;; Like end-of-line but ignores fields.
4355 (while (and (not (eobp)) (invisible-p (point)))
4356 (goto-char (next-char-property-change (point)))
4358 (point))))
4360 ;; Move to the desired column.
4361 (line-move-to-column (truncate column))
4363 ;; Corner case: suppose we start out in a field boundary in
4364 ;; the middle of a continued line. When we get to
4365 ;; line-move-finish, point is at the start of a new *screen*
4366 ;; line but the same text line; then line-move-to-column would
4367 ;; move us backwards. Test using C-n with point on the "x" in
4368 ;; (insert "a" (propertize "x" 'field t) (make-string 89 ?y))
4369 (and forward
4370 (< (point) old)
4371 (goto-char old))
4373 (setq new (point))
4375 ;; Process intangibility within a line.
4376 ;; With inhibit-point-motion-hooks bound to nil, a call to
4377 ;; goto-char moves point past intangible text.
4379 ;; However, inhibit-point-motion-hooks controls both the
4380 ;; intangibility and the point-entered/point-left hooks. The
4381 ;; following hack avoids calling the point-* hooks
4382 ;; unnecessarily. Note that we move *forward* past intangible
4383 ;; text when the initial and final points are the same.
4384 (goto-char new)
4385 (let ((inhibit-point-motion-hooks nil))
4386 (goto-char new)
4388 ;; If intangibility moves us to a different (later) place
4389 ;; in the same line, use that as the destination.
4390 (if (<= (point) line-end)
4391 (setq new (point))
4392 ;; If that position is "too late",
4393 ;; try the previous allowable position.
4394 ;; See if it is ok.
4395 (backward-char)
4396 (if (if forward
4397 ;; If going forward, don't accept the previous
4398 ;; allowable position if it is before the target line.
4399 (< line-beg (point))
4400 ;; If going backward, don't accept the previous
4401 ;; allowable position if it is still after the target line.
4402 (<= (point) line-end))
4403 (setq new (point))
4404 ;; As a last resort, use the end of the line.
4405 (setq new line-end))))
4407 ;; Now move to the updated destination, processing fields
4408 ;; as well as intangibility.
4409 (goto-char opoint)
4410 (let ((inhibit-point-motion-hooks nil))
4411 (goto-char
4412 ;; Ignore field boundaries if the initial and final
4413 ;; positions have the same `field' property, even if the
4414 ;; fields are non-contiguous. This seems to be "nicer"
4415 ;; behavior in many situations.
4416 (if (eq (get-char-property new 'field)
4417 (get-char-property opoint 'field))
4418 new
4419 (constrain-to-field new opoint t t
4420 'inhibit-line-move-field-capture))))
4422 ;; If all this moved us to a different line,
4423 ;; retry everything within that new line.
4424 (when (or (< (point) line-beg) (> (point) line-end))
4425 ;; Repeat the intangibility and field processing.
4426 (setq repeat t))))))
4428 (defun line-move-to-column (col)
4429 "Try to find column COL, considering invisibility.
4430 This function works only in certain cases,
4431 because what we really need is for `move-to-column'
4432 and `current-column' to be able to ignore invisible text."
4433 (if (zerop col)
4434 (beginning-of-line)
4435 (move-to-column col))
4437 (when (and line-move-ignore-invisible
4438 (not (bolp)) (invisible-p (1- (point))))
4439 (let ((normal-location (point))
4440 (normal-column (current-column)))
4441 ;; If the following character is currently invisible,
4442 ;; skip all characters with that same `invisible' property value.
4443 (while (and (not (eobp))
4444 (invisible-p (point)))
4445 (goto-char (next-char-property-change (point))))
4446 ;; Have we advanced to a larger column position?
4447 (if (> (current-column) normal-column)
4448 ;; We have made some progress towards the desired column.
4449 ;; See if we can make any further progress.
4450 (line-move-to-column (+ (current-column) (- col normal-column)))
4451 ;; Otherwise, go to the place we originally found
4452 ;; and move back over invisible text.
4453 ;; that will get us to the same place on the screen
4454 ;; but with a more reasonable buffer position.
4455 (goto-char normal-location)
4456 (let ((line-beg (save-excursion (beginning-of-line) (point))))
4457 (while (and (not (bolp)) (invisible-p (1- (point))))
4458 (goto-char (previous-char-property-change (point) line-beg))))))))
4460 (defun move-end-of-line (arg)
4461 "Move point to end of current line as displayed.
4462 With argument ARG not nil or 1, move forward ARG - 1 lines first.
4463 If point reaches the beginning or end of buffer, it stops there.
4465 To ignore the effects of the `intangible' text or overlay
4466 property, bind `inhibit-point-motion-hooks' to t.
4467 If there is an image in the current line, this function
4468 disregards newlines that are part of the text on which the image
4469 rests."
4470 (interactive "^p")
4471 (or arg (setq arg 1))
4472 (let (done)
4473 (while (not done)
4474 (let ((newpos
4475 (save-excursion
4476 (let ((goal-column 0)
4477 (line-move-visual nil))
4478 (and (line-move arg t)
4479 (not (bobp))
4480 (progn
4481 (while (and (not (bobp)) (invisible-p (1- (point))))
4482 (goto-char (previous-single-char-property-change
4483 (point) 'invisible)))
4484 (backward-char 1)))
4485 (point)))))
4486 (goto-char newpos)
4487 (if (and (> (point) newpos)
4489 (backward-char 1)
4490 (if (and (> (point) newpos) (not (eobp))
4492 ;; If we skipped something intangible and now we're not
4493 ;; really at eol, keep going.
4494 (setq arg 1)
4495 (setq done t)))))))
4497 (defun move-beginning-of-line (arg)
4498 "Move point to beginning of current line as displayed.
4499 \(If there's an image in the line, this disregards newlines
4500 which are part of the text that the image rests on.)
4502 With argument ARG not nil or 1, move forward ARG - 1 lines first.
4503 If point reaches the beginning or end of buffer, it stops there.
4504 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4505 (interactive "^p")
4506 (or arg (setq arg 1))
4508 (let ((orig (point))
4509 first-vis first-vis-field-value)
4511 ;; Move by lines, if ARG is not 1 (the default).
4512 (if (/= arg 1)
4513 (let ((line-move-visual nil))
4514 (line-move (1- arg) t)))
4516 ;; Move to beginning-of-line, ignoring fields and invisibles.
4518 (while (and (not (bobp)) (invisible-p (1- (point))))
4519 (goto-char (previous-char-property-change (point)))
4522 ;; Now find first visible char in the line
4523 (while (and (not (eobp)) (invisible-p (point)))
4524 (goto-char (next-char-property-change (point))))
4525 (setq first-vis (point))
4527 ;; See if fields would stop us from reaching FIRST-VIS.
4528 (setq first-vis-field-value
4529 (constrain-to-field first-vis orig (/= arg 1) t nil))
4531 (goto-char (if (/= first-vis-field-value first-vis)
4532 ;; If yes, obey them.
4533 first-vis-field-value
4534 ;; Otherwise, move to START with attention to fields.
4535 ;; (It is possible that fields never matter in this case.)
4536 (constrain-to-field (point) orig
4537 (/= arg 1) t nil)))))
4540 ;; Many people have said they rarely use this feature, and often type
4541 ;; it by accident. Maybe it shouldn't even be on a key.
4542 (put 'set-goal-column 'disabled t)
4544 (defun set-goal-column (arg)
4546 Those commands will move to this position in the line moved to
4547 rather than trying to keep the same horizontal position.
4548 With a non-nil argument ARG, clears out the goal column
4550 The goal column is stored in the variable `goal-column'."
4551 (interactive "P")
4552 (if arg
4553 (progn
4554 (setq goal-column nil)
4555 (message "No goal column"))
4556 (setq goal-column (current-column))
4557 ;; The older method below can be erroneous if `set-goal-column' is bound
4558 ;; to a sequence containing %
4559 ;;(message (substitute-command-keys
4561 ;;goal-column)
4562 (message "%s"
4563 (concat
4564 (format "Goal column %d " goal-column)
4565 (substitute-command-keys
4568 )
4569 nil)
4570 \f
4571 ;;; Editing based on visual lines, as opposed to logical lines.
4573 (defun end-of-visual-line (&optional n)
4574 "Move point to end of current visual line.
4575 With argument N not nil or 1, move forward N - 1 visual lines first.
4576 If point reaches the beginning or end of buffer, it stops there.
4577 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4578 (interactive "^p")
4579 (or n (setq n 1))
4580 (if (/= n 1)
4581 (let ((line-move-visual t))
4582 (line-move (1- n) t)))
4583 ;; Unlike `move-beginning-of-line', `move-end-of-line' doesn't
4584 ;; constrain to field boundaries, so we don't either.
4585 (vertical-motion (cons (window-width) 0)))
4587 (defun beginning-of-visual-line (&optional n)
4588 "Move point to beginning of current visual line.
4589 With argument N not nil or 1, move forward N - 1 visual lines first.
4590 If point reaches the beginning or end of buffer, it stops there.
4591 To ignore intangibility, bind `inhibit-point-motion-hooks' to t."
4592 (interactive "^p")
4593 (or n (setq n 1))
4594 (let ((opoint (point)))
4595 (if (/= n 1)
4596 (let ((line-move-visual t))
4597 (line-move (1- n) t)))
4598 (vertical-motion 0)
4599 ;; Constrain to field boundaries, like `move-beginning-of-line'.
4600 (goto-char (constrain-to-field (point) opoint (/= n 1)))))
4602 (defun kill-visual-line (&optional arg)
4603 "Kill the rest of the visual line.
4604 With prefix argument ARG, kill that many visual lines from point.
4605 If ARG is negative, kill visual lines backward.
4606 If ARG is zero, kill the text before point on the current visual
4607 line.
4609 If you want to append the killed line to the last killed text,
4612 If the buffer is read-only, Emacs will beep and refrain from deleting
4613 the line, but put the line in the kill ring anyway. This means that
4614 you can use this command to copy text from a read-only buffer.
4615 \(If the variable `kill-read-only-ok' is non-nil, then this won't
4616 even beep.)"
4617 (interactive "P")
4618 ;; Like in `kill-line', it's better to move point to the other end
4619 ;; of the kill before killing.
4620 (let ((opoint (point))
4621 (kill-whole-line (and kill-whole-line (bolp))))
4622 (if arg
4623 (vertical-motion (prefix-numeric-value arg))
4624 (end-of-visual-line 1)
4625 (if (= (point) opoint)
4626 (vertical-motion 1)
4627 ;; Skip any trailing whitespace at the end of the visual line.
4628 ;; We used to do this only if `show-trailing-whitespace' is
4629 ;; nil, but that's wrong; the correct thing would be to check
4630 ;; whether the trailing whitespace is highlighted. But, it's
4631 ;; OK to just do this unconditionally.
4634 (1+ (point))
4635 (point)))))
4637 (defun next-logical-line (&optional arg try-vscroll)
4638 "Move cursor vertically down ARG lines.
4639 This is identical to `next-line', except that it always moves
4640 by logical lines instead of visual lines, ignoring the value of
4641 the variable `line-move-visual'."
4643 (let ((line-move-visual nil))
4644 (with-no-warnings
4645 (next-line arg try-vscroll))))
4647 (defun previous-logical-line (&optional arg try-vscroll)
4648 "Move cursor vertically up ARG lines.
4649 This is identical to `previous-line', except that it always moves
4650 by logical lines instead of visual lines, ignoring the value of
4651 the variable `line-move-visual'."
4653 (let ((line-move-visual nil))
4654 (with-no-warnings
4655 (previous-line arg try-vscroll))))
4657 (defgroup visual-line nil
4658 "Editing based on visual lines."
4659 :group 'convenience
4660 :version "23.1")
4662 (defvar visual-line-mode-map
4663 (let ((map (make-sparse-keymap)))
4664 (define-key map [remap kill-line] 'kill-visual-line)
4665 (define-key map [remap move-beginning-of-line] 'beginning-of-visual-line)
4666 (define-key map [remap move-end-of-line] 'end-of-visual-line)
4667 ;; These keybindings interfere with xterm function keys. Are
4668 ;; there any other suitable bindings?
4669 ;; (define-key map "\M-[" 'previous-logical-line)
4670 ;; (define-key map "\M-]" 'next-logical-line)
4671 map))
4673 (defcustom visual-line-fringe-indicators '(nil nil)
4674 "How fringe indicators are shown for wrapped lines in `visual-line-mode'.
4675 The value should be a list of the form (LEFT RIGHT), where LEFT
4676 and RIGHT are symbols representing the bitmaps to display, to
4677 indicate wrapped lines, in the left and right fringes respectively.
4678 See also `fringe-indicator-alist'.
4679 The default is not to display fringe indicators for wrapped lines.
4680 This variable does not affect fringe indicators displayed for
4681 other purposes."
4682 :type '(list (choice (const :tag "Hide left indicator" nil)
4683 (const :tag "Left curly arrow" left-curly-arrow)
4684 (symbol :tag "Other bitmap"))
4685 (choice (const :tag "Hide right indicator" nil)
4686 (const :tag "Right curly arrow" right-curly-arrow)
4687 (symbol :tag "Other bitmap")))
4688 :set (lambda (symbol value)
4689 (dolist (buf (buffer-list))
4690 (with-current-buffer buf
4691 (when (and (boundp 'visual-line-mode)
4692 (symbol-value 'visual-line-mode))
4693 (setq fringe-indicator-alist
4694 (cons (cons 'continuation value)
4695 (assq-delete-all
4696 'continuation
4697 (copy-tree fringe-indicator-alist)))))))
4698 (set-default symbol value)))
4700 (defvar visual-line--saved-state nil)
4702 (define-minor-mode visual-line-mode
4703 "Redefine simple editing commands to act on visual lines, not logical lines.
4704 This also turns on `word-wrap' in the buffer."
4705 :keymap visual-line-mode-map
4706 :group 'visual-line
4707 :lighter " Wrap"
4708 (if visual-line-mode
4709 (progn
4710 (set (make-local-variable 'visual-line--saved-state) nil)
4711 ;; Save the local values of some variables, to be restored if
4712 ;; visual-line-mode is turned off.
4713 (dolist (var '(line-move-visual truncate-lines
4714 truncate-partial-width-windows
4715 word-wrap fringe-indicator-alist))
4716 (if (local-variable-p var)
4717 (push (cons var (symbol-value var))
4718 visual-line--saved-state)))
4719 (set (make-local-variable 'line-move-visual) t)
4720 (set (make-local-variable 'truncate-partial-width-windows) nil)
4721 (setq truncate-lines nil
4722 word-wrap t
4723 fringe-indicator-alist
4724 (cons (cons 'continuation visual-line-fringe-indicators)
4725 fringe-indicator-alist)))
4726 (kill-local-variable 'line-move-visual)
4727 (kill-local-variable 'word-wrap)
4728 (kill-local-variable 'truncate-lines)
4729 (kill-local-variable 'truncate-partial-width-windows)
4730 (kill-local-variable 'fringe-indicator-alist)
4731 (dolist (saved visual-line--saved-state)
4732 (set (make-local-variable (car saved)) (cdr saved)))
4733 (kill-local-variable 'visual-line--saved-state)))
4735 (defun turn-on-visual-line-mode ()
4736 (visual-line-mode 1))
4738 (define-globalized-minor-mode global-visual-line-mode
4739 visual-line-mode turn-on-visual-line-mode
4740 :lighter " vl")
4741 \f
4742 (defun scroll-other-window-down (lines)
4744 For more details, see the documentation for `scroll-other-window'."
4745 (interactive "P")
4746 (scroll-other-window
4747 ;; Just invert the argument's meaning.
4748 ;; We can do that without knowing which window it will be.
4749 (if (eq lines '-) nil
4750 (if (null lines) '-
4751 (- (prefix-numeric-value lines))))))
4753 (defun beginning-of-buffer-other-window (arg)
4754 "Move point to the beginning of the buffer in the other window.
4755 Leave mark at previous position.
4756 With arg N, put point N/10 of the way from the true beginning."
4757 (interactive "P")
4758 (let ((orig-window (selected-window))
4759 (window (other-window-for-scrolling)))
4760 ;; We use unwind-protect rather than save-window-excursion
4761 ;; because the latter would preserve the things we want to change.
4762 (unwind-protect
4763 (progn
4764 (select-window window)
4765 ;; Set point and mark in that window's buffer.
4766 (with-no-warnings
4767 (beginning-of-buffer arg))
4768 ;; Set point accordingly.
4769 (recenter '(t)))
4770 (select-window orig-window))))
4772 (defun end-of-buffer-other-window (arg)
4773 "Move point to the end of the buffer in the other window.
4774 Leave mark at previous position.
4775 With arg N, put point N/10 of the way from the true end."
4776 (interactive "P")
4777 ;; See beginning-of-buffer-other-window for comments.
4778 (let ((orig-window (selected-window))
4779 (window (other-window-for-scrolling)))
4780 (unwind-protect
4781 (progn
4782 (select-window window)
4783 (with-no-warnings
4784 (end-of-buffer arg))
4785 (recenter '(t)))
4786 (select-window orig-window))))
4787 \f
4788 (defun transpose-chars (arg)
4789 "Interchange characters around point, moving forward one character.
4790 With prefix arg ARG, effect is to take character before point
4791 and drag it forward past ARG other characters (backward if ARG negative).
4792 If no argument and at end of line, the previous two chars are exchanged."
4793 (interactive "*P")
4794 (and (null arg) (eolp) (forward-char -1))
4795 (transpose-subr 'forward-char (prefix-numeric-value arg)))
4797 (defun transpose-words (arg)
4798 "Interchange words around point, leaving point at end of them.
4799 With prefix arg ARG, effect is to take word before or around point
4800 and drag it forward past ARG other words (backward if ARG negative).
4801 If ARG is zero, the words around or after point and around or after mark
4802 are interchanged."
4803 ;; FIXME: `foo a!nd bar' should transpose into `bar and foo'.
4804 (interactive "*p")
4805 (transpose-subr 'forward-word arg))
4807 (defun transpose-sexps (arg)
4809 Does not work on a sexp that point is in the middle of
4810 if it is a list or string."
4811 (interactive "*p")
4812 (transpose-subr
4813 (lambda (arg)
4814 ;; Here we should try to simulate the behavior of
4815 ;; (cons (progn (forward-sexp x) (point))
4816 ;; (progn (forward-sexp (- x)) (point)))
4817 ;; Except that we don't want to rely on the second forward-sexp
4818 ;; putting us back to where we want to be, since forward-sexp-function
4819 ;; might do funny things like infix-precedence.
4820 (if (if (> arg 0)
4822 (and (not (bobp))
4824 ;; Jumping over a symbol. We might be inside it, mind you.
4825 (progn (funcall (if (> arg 0)
4826 'skip-syntax-backward 'skip-syntax-forward)
4827 "w_")
4828 (cons (save-excursion (forward-sexp arg) (point)) (point)))
4829 ;; Otherwise, we're between sexps. Take a step back before jumping
4830 ;; to make sure we'll obey the same precedence no matter which direction
4831 ;; we're going.
4832 (funcall (if (> arg 0) 'skip-syntax-backward 'skip-syntax-forward) " .")
4833 (cons (save-excursion (forward-sexp arg) (point))
4834 (progn (while (or (forward-comment (if (> arg 0) 1 -1))
4835 (not (zerop (funcall (if (> arg 0)
4836 'skip-syntax-forward
4837 'skip-syntax-backward)
4838 ".")))))
4839 (point)))))
4840 arg 'special))
4842 (defun transpose-lines (arg)
4843 "Exchange current line and previous line, leaving point after both.
4844 With argument ARG, takes previous line and moves it past ARG lines.
4845 With argument 0, interchanges line point is in with line mark is in."
4846 (interactive "*p")
4847 (transpose-subr (function
4848 (lambda (arg)
4849 (if (> arg 0)
4850 (progn
4851 ;; Move forward over ARG lines,
4852 ;; but create newlines if necessary.
4853 (setq arg (forward-line arg))
4855 (setq arg (1+ arg)))
4856 (if (> arg 0)
4857 (newline arg)))
4858 (forward-line arg))))
4859 arg))
4861 ;; FIXME seems to leave point BEFORE the current object when ARG = 0,
4862 ;; which seems inconsistent with the ARG /= 0 case.
4863 ;; FIXME document SPECIAL.
4864 (defun transpose-subr (mover arg &optional special)
4865 "Subroutine to do the work of transposing objects.
4866 Works for lines, sentences, paragraphs, etc. MOVER is a function that
4867 moves forward by units of the given object (e.g. forward-sentence,
4868 forward-paragraph). If ARG is zero, exchanges the current object
4869 with the one containing mark. If ARG is an integer, moves the
4870 current object past ARG following (if ARG is positive) or
4871 preceding (if ARG is negative) objects, leaving point after the
4872 current object."
4873 (let ((aux (if special mover
4874 (lambda (x)
4875 (cons (progn (funcall mover x) (point))
4876 (progn (funcall mover (- x)) (point))))))
4877 pos1 pos2)
4878 (cond
4879 ((= arg 0)
4880 (save-excursion
4881 (setq pos1 (funcall aux 1))
4882 (goto-char (or (mark) (error "No mark set in this buffer")))
4883 (setq pos2 (funcall aux 1))
4884 (transpose-subr-1 pos1 pos2))
4885 (exchange-point-and-mark))
4886 ((> arg 0)
4887 (setq pos1 (funcall aux -1))
4888 (setq pos2 (funcall aux arg))
4889 (transpose-subr-1 pos1 pos2)
4890 (goto-char (car pos2)))
4891 (t
4892 (setq pos1 (funcall aux -1))
4893 (goto-char (car pos1))
4894 (setq pos2 (funcall aux arg))
4895 (transpose-subr-1 pos1 pos2)))))
4897 (defun transpose-subr-1 (pos1 pos2)
4898 (when (> (car pos1) (cdr pos1)) (setq pos1 (cons (cdr pos1) (car pos1))))
4899 (when (> (car pos2) (cdr pos2)) (setq pos2 (cons (cdr pos2) (car pos2))))
4900 (when (> (car pos1) (car pos2))
4901 (let ((swap pos1))
4902 (setq pos1 pos2 pos2 swap)))
4903 (if (> (cdr pos1) (car pos2)) (error "Don't have two things to transpose"))
4904 (atomic-change-group
4905 (let (word2)
4906 ;; FIXME: We first delete the two pieces of text, so markers that
4907 ;; used to point to after the text end up pointing to before it :-(
4908 (setq word2 (delete-and-extract-region (car pos2) (cdr pos2)))
4909 (goto-char (car pos2))
4910 (insert (delete-and-extract-region (car pos1) (cdr pos1)))
4911 (goto-char (car pos1))
4912 (insert word2))))
4913 \f
4914 (defun backward-word (&optional arg)
4915 "Move backward until encountering the beginning of a word.
4916 With argument ARG, do this that many times."
4917 (interactive "^p")
4918 (forward-word (- (or arg 1))))
4920 (defun mark-word (&optional arg allow-extend)
4921 "Set mark ARG words away from point.
4923 move to with the same argument.
4924 Interactively, if this command is repeated
4925 or (in Transient Mark mode) if the mark is active,
4926 it marks the next ARG words after the ones already marked."
4928 (cond ((and allow-extend
4929 (or (and (eq last-command this-command) (mark t))
4930 (region-active-p)))
4931 (setq arg (if arg (prefix-numeric-value arg)
4932 (if (< (mark) (point)) -1 1)))
4933 (set-mark
4934 (save-excursion
4935 (goto-char (mark))
4936 (forward-word arg)
4937 (point))))
4938 (t
4939 (push-mark
4940 (save-excursion
4941 (forward-word (prefix-numeric-value arg))
4942 (point))
4943 nil t))))
4945 (defun kill-word (arg)
4946 "Kill characters forward until encountering the end of a word.
4947 With argument ARG, do this that many times."
4948 (interactive "p")
4949 (kill-region (point) (progn (forward-word arg) (point))))
4951 (defun backward-kill-word (arg)
4952 "Kill characters backward until encountering the beginning of a word.
4953 With argument ARG, do this that many times."
4954 (interactive "p")
4955 (kill-word (- arg)))
4957 (defun current-word (&optional strict really-word)
4958 "Return the symbol or word that point is on (or a nearby one) as a string.
4959 The return value includes no text properties.
4960 If optional arg STRICT is non-nil, return nil unless point is within
4961 or adjacent to a symbol or word. In all cases the value can be nil
4962 if there is no word nearby.
4963 The function, belying its name, normally finds a symbol.
4964 If optional arg REALLY-WORD is non-nil, it finds just a word."
4965 (save-excursion
4966 (let* ((oldpoint (point)) (start (point)) (end (point))
4967 (syntaxes (if really-word "w" "w_"))
4968 (not-syntaxes (concat "^" syntaxes)))
4969 (skip-syntax-backward syntaxes) (setq start (point))
4970 (goto-char oldpoint)
4971 (skip-syntax-forward syntaxes) (setq end (point))
4972 (when (and (eq start oldpoint) (eq end oldpoint)
4973 ;; Point is neither within nor adjacent to a word.
4974 (not strict))
4975 ;; Look for preceding word in same line.
4976 (skip-syntax-backward not-syntaxes
4977 (save-excursion (beginning-of-line)
4978 (point)))
4979 (if (bolp)
4980 ;; No preceding word in same line.
4981 ;; Look for following word in same line.
4982 (progn
4983 (skip-syntax-forward not-syntaxes
4984 (save-excursion (end-of-line)
4985 (point)))
4986 (setq start (point))
4987 (skip-syntax-forward syntaxes)
4988 (setq end (point)))
4989 (setq end (point))
4990 (skip-syntax-backward syntaxes)
4991 (setq start (point))))
4992 ;; If we found something nonempty, return it as a string.
4993 (unless (= start end)
4994 (buffer-substring-no-properties start end)))))
4995 \f
4996 (defcustom fill-prefix nil
4997 "String for filling to insert at front of new line, or nil for none."
4998 :type '(choice (const :tag "None" nil)
4999 string)
5000 :group 'fill)
5001 (make-variable-buffer-local 'fill-prefix)
5002 (put 'fill-prefix 'safe-local-variable 'string-or-null-p)
5004 (defcustom auto-fill-inhibit-regexp nil
5005 "Regexp to match lines which should not be auto-filled."
5006 :type '(choice (const :tag "None" nil)
5007 regexp)
5008 :group 'fill)
5010 (defun do-auto-fill ()
5011 "The default value for `normal-auto-fill-function'.
5012 This is the default auto-fill function, some major modes use a different one.
5013 Returns t if it really did any work."
5014 (let (fc justify give-up
5015 (fill-prefix fill-prefix))
5016 (if (or (not (setq justify (current-justification)))
5017 (null (setq fc (current-fill-column)))
5018 (and (eq justify 'left)
5019 (<= (current-column) fc))
5020 (and auto-fill-inhibit-regexp
5021 (save-excursion (beginning-of-line)
5022 (looking-at auto-fill-inhibit-regexp))))
5023 nil ;; Auto-filling not required
5024 (if (memq justify '(full center right))
5025 (save-excursion (unjustify-current-line)))
5027 ;; Choose a fill-prefix automatically.
5028 (when (and adaptive-fill-mode
5029 (or (null fill-prefix) (string= fill-prefix "")))
5030 (let ((prefix
5031 (fill-context-prefix
5032 (save-excursion (backward-paragraph 1) (point))
5033 (save-excursion (forward-paragraph 1) (point)))))
5034 (and prefix (not (equal prefix ""))
5035 ;; Use auto-indentation rather than a guessed empty prefix.
5036 (not (and fill-indent-according-to-mode
5038 (setq fill-prefix prefix))))
5040 (while (and (not give-up) (> (current-column) fc))
5041 ;; Determine where to split the line.
5042 (let* (after-prefix
5043 (fill-point
5044 (save-excursion
5045 (beginning-of-line)
5046 (setq after-prefix (point))
5047 (and fill-prefix
5048 (looking-at (regexp-quote fill-prefix))
5049 (setq after-prefix (match-end 0)))
5050 (move-to-column (1+ fc))
5051 (fill-move-to-break-point after-prefix)
5052 (point))))
5054 ;; See whether the place we found is any good.
5055 (if (save-excursion
5056 (goto-char fill-point)
5057 (or (bolp)
5058 ;; There is no use breaking at end of line.
5059 (save-excursion (skip-chars-forward " ") (eolp))
5060 ;; It is futile to split at the end of the prefix
5061 ;; since we would just insert the prefix again.
5062 (and after-prefix (<= (point) after-prefix))
5063 ;; Don't split right after a comment starter
5064 ;; since we would just make another comment starter.
5065 (and comment-start-skip
5066 (let ((limit (point)))
5067 (beginning-of-line)
5068 (and (re-search-forward comment-start-skip
5069 limit t)
5070 (eq (point) limit))))))
5071 ;; No good place to break => stop trying.
5072 (setq give-up t)
5073 ;; Ok, we have a useful place to break the line. Do it.
5074 (let ((prev-column (current-column)))
5075 ;; If point is at the fill-point, do not `save-excursion'.
5076 ;; Otherwise, if a comment prefix or fill-prefix is inserted,
5077 ;; point will end up before it rather than after it.
5078 (if (save-excursion
5080 (= (point) fill-point))
5081 (default-indent-new-line t)
5082 (save-excursion
5083 (goto-char fill-point)
5084 (default-indent-new-line t)))
5085 ;; Now do justification, if required
5086 (if (not (eq justify 'left))
5087 (save-excursion
5088 (end-of-line 0)
5089 (justify-current-line justify nil t)))
5090 ;; If making the new line didn't reduce the hpos of
5091 ;; the end of the line, then give up now;
5092 ;; trying again will not help.
5093 (if (>= (current-column) prev-column)
5094 (setq give-up t))))))
5095 ;; Justify last line.
5096 (justify-current-line justify t t)
5097 t)))
5099 (defvar comment-line-break-function 'comment-indent-new-line
5100 "*Mode-specific function which line breaks and continues a comment.
5101 This function is called during auto-filling when a comment syntax
5102 is defined.
5103 The function should take a single optional argument, which is a flag
5104 indicating whether it should use soft newlines.")
5106 (defun default-indent-new-line (&optional soft)
5107 "Break line at point and indent.
5108 If a comment syntax is defined, call `comment-indent-new-line'.
5110 The inserted newline is marked hard if variable `use-hard-newlines' is true,
5111 unless optional argument SOFT is non-nil."
5112 (interactive)
5113 (if comment-start
5114 (funcall comment-line-break-function soft)
5115 ;; Insert the newline before removing empty space so that markers
5116 ;; get preserved better.
5118 (save-excursion (forward-char -1) (delete-horizontal-space))
5119 (delete-horizontal-space)
5121 (if (and fill-prefix (not adaptive-fill-mode))
5122 ;; Blindly trust a non-adaptive fill-prefix.
5123 (progn
5124 (indent-to-left-margin)
5125 (insert-before-markers-and-inherit fill-prefix))
5127 (cond
5128 ;; If there's an adaptive prefix, use it unless we're inside
5129 ;; a comment and the prefix is not a comment starter.
5130 (fill-prefix
5131 (indent-to-left-margin)
5132 (insert-and-inherit fill-prefix))
5133 ;; If we're not inside a comment, just try to indent.
5134 (t (indent-according-to-mode))))))
5136 (defvar normal-auto-fill-function 'do-auto-fill
5137 "The function to use for `auto-fill-function' if Auto Fill mode is turned on.
5138 Some major modes set this.")
5140 (put 'auto-fill-function :minor-mode-function 'auto-fill-mode)
5141 ;; `functions' and `hooks' are usually unsafe to set, but setting
5142 ;; auto-fill-function to nil in a file-local setting is safe and
5143 ;; can be useful to prevent auto-filling.
5144 (put 'auto-fill-function 'safe-local-variable 'null)
5145 ;; FIXME: turn into a proper minor mode.
5146 ;; Add a global minor mode version of it.
5147 (defun auto-fill-mode (&optional arg)
5148 "Toggle Auto Fill mode.
5149 With ARG, turn Auto Fill mode on if and only if ARG is positive.
5150 In Auto Fill mode, inserting a space at a column beyond `current-fill-column'
5151 automatically breaks the line at a previous space.
5153 The value of `normal-auto-fill-function' specifies the function to use
5154 for `auto-fill-function' when turning Auto Fill mode on."
5155 (interactive "P")
5156 (prog1 (setq auto-fill-function
5157 (if (if (null arg)
5158 (not auto-fill-function)
5159 (> (prefix-numeric-value arg) 0))
5160 normal-auto-fill-function
5161 nil))
5162 (force-mode-line-update)))
5164 ;; This holds a document string used to document auto-fill-mode.
5165 (defun auto-fill-function ()
5166 "Automatically break line at a previous space, in insertion of text."
5167 nil)
5169 (defun turn-on-auto-fill ()
5170 "Unconditionally turn on Auto Fill mode."
5171 (auto-fill-mode 1))
5173 (defun turn-off-auto-fill ()
5174 "Unconditionally turn off Auto Fill mode."
5175 (auto-fill-mode -1))
5177 (custom-add-option 'text-mode-hook 'turn-on-auto-fill)
5179 (defun set-fill-column (arg)
5180 "Set `fill-column' to specified argument.
5183 (interactive
5184 (list (or current-prefix-arg
5185 ;; We used to use current-column silently, but C-x f is too easily
5186 ;; typed as a typo for C-x C-f, so we turned it into an error and
5187 ;; now an interactive prompt.
5188 (read-number "Set fill-column to: " (current-column)))))
5189 (if (consp arg)
5190 (setq arg (current-column)))
5191 (if (not (integerp arg))
5192 ;; Disallow missing argument; it's probably a typo for C-x C-f.
5193 (error "set-fill-column requires an explicit argument")
5194 (message "Fill column set to %d (was %d)" arg fill-column)
5195 (setq fill-column arg)))
5196 \f
5197 (defun set-selective-display (arg)
5198 "Set `selective-display' to ARG; clear it if no arg.
5199 When the value of `selective-display' is a number > 0,
5200 lines whose indentation is >= that value are not displayed.
5201 The variable `selective-display' has a separate value for each buffer."
5202 (interactive "P")
5203 (if (eq selective-display t)
5204 (error "selective-display already in use for marked lines"))
5205 (let ((current-vpos
5206 (save-restriction
5207 (narrow-to-region (point-min) (point))
5208 (goto-char (window-start))
5209 (vertical-motion (window-height)))))
5210 (setq selective-display
5211 (and arg (prefix-numeric-value arg)))
5212 (recenter current-vpos))
5213 (set-window-start (selected-window) (window-start (selected-window)))
5214 (princ "selective-display set to " t)
5215 (prin1 selective-display t)
5216 (princ "." t))
5218 (defvaralias 'indicate-unused-lines 'indicate-empty-lines)
5220 (defun toggle-truncate-lines (&optional arg)
5221 "Toggle whether to fold or truncate long lines for the current buffer.
5222 With prefix argument ARG, truncate long lines if ARG is positive,
5223 otherwise don't truncate them. Note that in side-by-side windows,
5224 this command has no effect if `truncate-partial-width-windows'
5225 is non-nil."
5226 (interactive "P")
5227 (setq truncate-lines
5228 (if (null arg)
5229 (not truncate-lines)
5230 (> (prefix-numeric-value arg) 0)))
5231 (force-mode-line-update)
5232 (unless truncate-lines
5233 (let ((buffer (current-buffer)))
5234 (walk-windows (lambda (window)
5235 (if (eq buffer (window-buffer window))
5236 (set-window-hscroll window 0)))
5237 nil t)))
5238 (message "Truncate long lines %s"
5239 (if truncate-lines "enabled" "disabled")))
5241 (defun toggle-word-wrap (&optional arg)
5242 "Toggle whether to use word-wrapping for continuation lines.
5243 With prefix argument ARG, wrap continuation lines at word boundaries
5244 if ARG is positive, otherwise wrap them at the right screen edge.
5245 This command toggles the value of `word-wrap'. It has no effect
5246 if long lines are truncated."
5247 (interactive "P")
5248 (setq word-wrap
5249 (if (null arg)
5250 (not word-wrap)
5251 (> (prefix-numeric-value arg) 0)))
5252 (force-mode-line-update)
5253 (message "Word wrapping %s"
5254 (if word-wrap "enabled" "disabled")))
5256 (defvar overwrite-mode-textual (purecopy " Ovwrt")
5257 "The string displayed in the mode line when in overwrite mode.")
5258 (defvar overwrite-mode-binary (purecopy " Bin Ovwrt")
5259 "The string displayed in the mode line when in binary overwrite mode.")
5261 (defun overwrite-mode (arg)
5262 "Toggle overwrite mode.
5263 With prefix argument ARG, turn overwrite mode on if ARG is positive,
5264 otherwise turn it off. In overwrite mode, printing characters typed
5265 in replace existing text on a one-for-one basis, rather than pushing
5266 it to the right. At the end of a line, such characters extend the line.
5267 Before a tab, such characters insert until the tab is filled in.
5269 is supposed to make it easier to insert characters when necessary."
5270 (interactive "P")
5271 (setq overwrite-mode
5272 (if (if (null arg) (not overwrite-mode)
5273 (> (prefix-numeric-value arg) 0))
5274 'overwrite-mode-textual))
5275 (force-mode-line-update))
5277 (defun binary-overwrite-mode (arg)
5278 "Toggle binary overwrite mode.
5279 With prefix argument ARG, turn binary overwrite mode on if ARG is
5280 positive, otherwise turn it off. In binary overwrite mode, printing
5281 characters typed in replace existing text. Newlines are not treated
5282 specially, so typing at the end of a line joins the line to the next,
5283 with the typed character between them. Typing before a tab character
5285 replaces the text at the cursor, just as ordinary typing characters do.
5287 Note that binary overwrite mode is not its own minor mode; it is a
5288 specialization of overwrite mode, entered by setting the
5289 `overwrite-mode' variable to `overwrite-mode-binary'."
5290 (interactive "P")
5291 (setq overwrite-mode
5292 (if (if (null arg)
5293 (not (eq overwrite-mode 'overwrite-mode-binary))
5294 (> (prefix-numeric-value arg) 0))
5295 'overwrite-mode-binary))
5296 (force-mode-line-update))
5298 (define-minor-mode line-number-mode
5299 "Toggle Line Number mode.
5300 With ARG, turn Line Number mode on if ARG is positive, otherwise
5301 turn it off. When Line Number mode is enabled, the line number
5302 appears in the mode line.
5304 Line numbers do not appear for very large buffers and buffers
5305 with very long lines; see variables `line-number-display-limit'
5306 and `line-number-display-limit-width'."
5307 :init-value t :global t :group 'mode-line)
5309 (define-minor-mode column-number-mode
5310 "Toggle Column Number mode.
5311 With ARG, turn Column Number mode on if ARG is positive,
5312 otherwise turn it off. When Column Number mode is enabled, the
5313 column number appears in the mode line."
5314 :global t :group 'mode-line)
5316 (define-minor-mode size-indication-mode
5317 "Toggle Size Indication mode.
5318 With ARG, turn Size Indication mode on if ARG is positive,
5319 otherwise turn it off. When Size Indication mode is enabled, the
5320 size of the accessible part of the buffer appears in the mode line."
5321 :global t :group 'mode-line)
5322 \f
5323 (defgroup paren-blinking nil
5324 "Blinking matching of parens and expressions."
5325 :prefix "blink-matching-"
5326 :group 'paren-matching)
5328 (defcustom blink-matching-paren t
5329 "Non-nil means show matching open-paren when close-paren is inserted."
5330 :type 'boolean
5331 :group 'paren-blinking)
5333 (defcustom blink-matching-paren-on-screen t
5334 "Non-nil means show matching open-paren when it is on screen.
5335 If nil, don't show it (but the open-paren can still be shown
5336 when it is off screen).
5338 This variable has no effect if `blink-matching-paren' is nil.
5339 \(In that case, the open-paren is never shown.)
5340 It is also ignored if `show-paren-mode' is enabled."
5341 :type 'boolean
5342 :group 'paren-blinking)
5344 (defcustom blink-matching-paren-distance (* 100 1024)
5345 "If non-nil, maximum distance to search backwards for matching open-paren.
5346 If nil, search stops at the beginning of the accessible portion of the buffer."
5347 :version "23.2" ; 25->100k
5348 :type '(choice (const nil) integer)
5349 :group 'paren-blinking)
5351 (defcustom blink-matching-delay 1
5352 "Time in seconds to delay after showing a matching paren."
5353 :type 'number
5354 :group 'paren-blinking)
5356 (defcustom blink-matching-paren-dont-ignore-comments nil
5357 "If nil, `blink-matching-paren' ignores comments.
5358 More precisely, when looking for the matching parenthesis,
5359 it skips the contents of comments that end before point."
5360 :type 'boolean
5361 :group 'paren-blinking)
5363 (defun blink-matching-open ()
5364 "Move cursor momentarily to the beginning of the sexp before point."
5365 (interactive)
5366 (when (and (> (point) (point-min))
5367 blink-matching-paren
5368 ;; Verify an even number of quoting characters precede the close.
5369 (= 1 (logand 1 (- (point)
5370 (save-excursion
5371 (forward-char -1)
5373 (point))))))
5374 (let* ((oldpos (point))
5375 (message-log-max nil) ; Don't log messages about paren matching.
5376 (atdollar (eq (syntax-class (syntax-after (1- oldpos))) 8))
5377 (isdollar)
5378 (blinkpos
5379 (save-excursion
5380 (save-restriction
5381 (if blink-matching-paren-distance
5382 (narrow-to-region
5383 (max (minibuffer-prompt-end) ;(point-min) unless minibuf.
5384 (- (point) blink-matching-paren-distance))
5385 oldpos))
5386 (let ((parse-sexp-ignore-comments
5387 (and parse-sexp-ignore-comments
5388 (not blink-matching-paren-dont-ignore-comments))))
5389 (condition-case ()
5390 (scan-sexps oldpos -1)
5391 (error nil))))))
5392 (matching-paren
5393 (and blinkpos
5394 ;; Not syntax '$'.
5395 (not (setq isdollar
5396 (eq (syntax-class (syntax-after blinkpos)) 8)))
5397 (let ((syntax (syntax-after blinkpos)))
5398 (and (consp syntax)
5399 (eq (syntax-class syntax) 4)
5400 (cdr syntax))))))
5401 (cond
5402 ;; isdollar is for:
5403 ;; http://lists.gnu.org/archive/html/emacs-devel/2007-10/msg00871.html
5404 ((not (or (and isdollar blinkpos)
5405 (and atdollar (not blinkpos)) ; see below
5406 (eq matching-paren (char-before oldpos))
5407 ;; The cdr might hold a new paren-class info rather than
5408 ;; a matching-char info, in which case the two CDRs
5409 ;; should match.
5410 (eq matching-paren (cdr (syntax-after (1- oldpos))))))
5411 (if (minibufferp)
5412 (minibuffer-message " [Mismatched parentheses]")
5413 (message "Mismatched parentheses")))
5414 ((not blinkpos)
5415 (or blink-matching-paren-distance
5416 ;; Don't complain when `$' with no blinkpos, because it
5417 ;; could just be the first one typed in the buffer.
5418 atdollar
5419 (if (minibufferp)
5420 (minibuffer-message " [Unmatched parenthesis]")
5421 (message "Unmatched parenthesis"))))
5422 ((pos-visible-in-window-p blinkpos)
5423 ;; Matching open within window, temporarily move to blinkpos but only
5424 ;; if `blink-matching-paren-on-screen' is non-nil.
5425 (and blink-matching-paren-on-screen
5426 (not show-paren-mode)
5427 (save-excursion
5428 (goto-char blinkpos)
5429 (sit-for blink-matching-delay))))
5430 (t
5431 (save-excursion
5432 (goto-char blinkpos)
5433 (let ((open-paren-line-string
5434 ;; Show what precedes the open in its line, if anything.
5435 (cond
5437 (buffer-substring (line-beginning-position)
5438 (1+ blinkpos)))
5439 ;; Show what follows the open in its line, if anything.
5440 ((save-excursion
5441 (forward-char 1)
5443 (not (eolp)))
5444 (buffer-substring blinkpos
5445 (line-end-position)))
5446 ;; Otherwise show the previous nonblank line,
5447 ;; if there is one.
5449 (concat
5450 (buffer-substring (progn
5452 (line-beginning-position))
5453 (progn (end-of-line)
5455 (point)))
5456 ;; Replace the newline and other whitespace with `...'.
5457 "..."
5458 (buffer-substring blinkpos (1+ blinkpos))))
5459 ;; There is nothing to show except the char itself.
5460 (t (buffer-substring blinkpos (1+ blinkpos))))))
5461 (message "Matches %s"
5462 (substring-no-properties open-paren-line-string)))))))))
5464 (setq blink-paren-function 'blink-matching-open)
5465 \f
5466 ;; This executes C-g typed while Emacs is waiting for a command.
5467 ;; Quitting out of a program does not go through here;
5468 ;; that happens in the QUIT macro at the C code level.
5469 (defun keyboard-quit ()
5470 "Signal a `quit' condition.
5471 During execution of Lisp code, this character causes a quit directly.
5472 At top-level, as an editor command, this simply beeps."
5473 (interactive)
5474 (deactivate-mark)
5475 (if (fboundp 'kmacro-keyboard-quit)
5476 (kmacro-keyboard-quit))
5477 (setq defining-kbd-macro nil)
5478 (signal 'quit nil))
5480 (defvar buffer-quit-function nil
5483 \(such as cancelling a prefix argument, minibuffer or region) do not apply.")
5485 (defun keyboard-escape-quit ()
5487 This command can exit an interactive command such as `query-replace',
5488 can clear out a prefix argument or a region,
5489 can get out of the minibuffer or other recursive edit,
5490 cancel the use of the current buffer (for special-purpose buffers),
5491 or go back to just one window (by deleting all but the selected window)."
5492 (interactive)
5493 (cond ((eq last-command 'mode-exited) nil)
5494 ((> (minibuffer-depth) 0)
5495 (abort-recursive-edit))
5496 (current-prefix-arg
5497 nil)
5498 ((region-active-p)
5499 (deactivate-mark))
5500 ((> (recursion-depth) 0)
5501 (exit-recursive-edit))
5502 (buffer-quit-function
5503 (funcall buffer-quit-function))
5504 ((not (one-window-p t))
5505 (delete-other-windows))
5507 (bury-buffer))))
5509 (defun play-sound-file (file &optional volume device)
5510 "Play sound stored in FILE.
5511 VOLUME and DEVICE correspond to the keywords of the sound
5512 specification for `play-sound'."
5513 (interactive "fPlay sound file: ")
5514 (let ((sound (list :file file)))
5515 (if volume
5516 (plist-put sound :volume volume))
5517 (if device
5518 (plist-put sound :device device))
5519 (push 'sound sound)
5520 (play-sound sound)))
5522 \f
5523 (defcustom read-mail-command 'rmail
5524 "Your preference for a mail reading package.
5525 This is used by some keybindings which support reading mail.
5526 See also `mail-user-agent' concerning sending mail."
5529 (function-item :tag "Emacs interface to MH"
5531 (function :tag "Other"))
5532 :version "21.1"
5533 :group 'mail)
5535 (defcustom mail-user-agent 'message-user-agent
5536 "Your preference for a mail composition package.
5537 Various Emacs Lisp packages (e.g. Reporter) require you to compose an
5538 outgoing email message. This variable lets you specify which
5539 mail-sending package you prefer.
5541 Valid values include:
5543 `message-user-agent' -- use the Message package.
5544 See Info node `(message)'.
5545 `sendmail-user-agent' -- use the Mail package.
5546 See Info node `(emacs)Sending Mail'.
5547 `mh-e-user-agent' -- use the Emacs interface to the MH mail system.
5548 See Info node `(mh-e)'.
5549 `gnus-user-agent' -- like `message-user-agent', but with Gnus
5550 paraphernalia, particularly the Gcc: header for
5551 archiving.
5553 Additional valid symbols may be available; check with the author of
5554 your package for details. The function should return non-nil if it
5555 succeeds.
5557 See also `read-mail-command' concerning reading mail."
5558 :type '(radio (function-item :tag "Message package"
5560 message-user-agent)
5561 (function-item :tag "Mail package"
5563 sendmail-user-agent)
5564 (function-item :tag "Emacs interface to MH"
5566 mh-e-user-agent)
5567 (function-item :tag "Message with full Gnus features"
5569 gnus-user-agent)
5570 (function :tag "Other"))
5571 :version "23.2" ; sendmail->message
5572 :group 'mail)
5574 (defcustom compose-mail-user-agent-warnings t
5575 "If non-nil, `compose-mail' warns about changes in `mail-user-agent'.
5576 If the value of `mail-user-agent' is the default, and the user
5577 appears to have customizations applying to the old default,
5578 `compose-mail' issues a warning."
5579 :type 'boolean
5580 :version "23.2"
5581 :group 'mail)
5583 (define-mail-user-agent 'sendmail-user-agent
5584 'sendmail-user-agent-compose
5585 'mail-send-and-exit)
5587 (defun rfc822-goto-eoh ()
5588 ;; Go to header delimiter line in a mail message, following RFC822 rules
5589 (goto-char (point-min))
5590 (when (re-search-forward
5592 (goto-char (match-beginning 0))))
5594 (defun sendmail-user-agent-compose (&optional to subject other-headers continue
5595 switch-function yank-action
5596 send-actions)
5597 (if switch-function
5598 (let ((special-display-buffer-names nil)
5599 (special-display-regexps nil)
5600 (same-window-buffer-names nil)
5601 (same-window-regexps nil))
5602 (funcall switch-function "*mail*")))
5603 (let ((cc (cdr (assoc-string "cc" other-headers t)))
5604 (in-reply-to (cdr (assoc-string "in-reply-to" other-headers t)))
5605 (body (cdr (assoc-string "body" other-headers t))))
5606 (or (mail continue to subject in-reply-to cc yank-action send-actions)
5607 continue
5608 (error "Message aborted"))
5609 (save-excursion
5610 (rfc822-goto-eoh)
5611 (while other-headers
5612 (unless (member-ignore-case (car (car other-headers))
5613 '("in-reply-to" "cc" "body"))
5614 (insert (car (car other-headers)) ": "
5615 (cdr (car other-headers))
5617 (setq other-headers (cdr other-headers)))
5618 (when body
5619 (forward-line 1)
5620 (insert body))
5621 t)))
5623 (defun compose-mail (&optional to subject other-headers continue
5624 switch-function yank-action send-actions)
5625 "Start composing a mail message to send.
5626 This uses the user's chosen mail composition package
5627 as selected with the variable `mail-user-agent'.
5628 The optional arguments TO and SUBJECT specify recipients
5629 and the initial Subject field, respectively.
5631 OTHER-HEADERS is an alist specifying additional
5632 header fields. Elements look like (HEADER . VALUE) where both
5633 HEADER and VALUE are strings.
5635 CONTINUE, if non-nil, says to continue editing a message already
5636 being composed. Interactively, CONTINUE is the prefix argument.
5638 SWITCH-FUNCTION, if non-nil, is a function to use to
5639 switch to and display the buffer used for mail composition.
5641 YANK-ACTION, if non-nil, is an action to perform, if and when necessary,
5642 to insert the raw text of the message being replied to.
5643 It has the form (FUNCTION . ARGS). The user agent will apply
5644 FUNCTION to ARGS, to insert the raw text of the original message.
5645 \(The user agent will also run `mail-citation-hook', *after* the
5646 original text has been inserted in this way.)
5648 SEND-ACTIONS is a list of actions to call when the message is sent.
5649 Each action has the form (FUNCTION . ARGS)."
5650 (interactive
5651 (list nil nil nil current-prefix-arg))
5653 ;; In Emacs 23.2, the default value of `mail-user-agent' changed
5654 ;; from sendmail-user-agent to message-user-agent. Some users may
5655 ;; encounter incompatibilities. This hack tries to detect problems
5656 ;; and warn about them.
5657 (and compose-mail-user-agent-warnings
5658 (eq mail-user-agent 'message-user-agent)
5659 (let (warn-vars)
5660 (dolist (var '(mail-mode-hook mail-send-hook mail-setup-hook
5661 mail-yank-hooks mail-archive-file-name
5662 mail-default-reply-to mail-mailing-lists
5663 mail-self-blind))
5664 (and (boundp var)
5665 (symbol-value var)
5666 (push var warn-vars)))
5667 (when warn-vars
5668 (display-warning 'mail
5669 (format "\
5670 The default mail mode is now Message mode.
5671 You have the following Mail mode variable%s customized:
5673 To disable this warning, set `compose-mail-user-agent-warnings' to nil."
5674 (if (> (length warn-vars) 1) "s" "")
5675 (mapconcat 'symbol-name
5676 warn-vars " "))))))
5678 (let ((function (get mail-user-agent 'composefunc)))
5679 (funcall function to subject other-headers continue
5680 switch-function yank-action send-actions)))
5682 (defun compose-mail-other-window (&optional to subject other-headers continue
5683 yank-action send-actions)
5685 (interactive
5686 (list nil nil nil current-prefix-arg))
5687 (compose-mail to subject other-headers continue
5688 'switch-to-buffer-other-window yank-action send-actions))
5691 (defun compose-mail-other-frame (&optional to subject other-headers continue
5692 yank-action send-actions)
5694 (interactive
5695 (list nil nil nil current-prefix-arg))
5696 (compose-mail to subject other-headers continue
5697 'switch-to-buffer-other-frame yank-action send-actions))
5698 \f
5699 (defvar set-variable-value-history nil
5700 "History of values entered with `set-variable'.
5702 Maximum length of the history list is determined by the value
5703 of `history-length', which see.")
5705 (defun set-variable (variable value &optional make-local)
5706 "Set VARIABLE to VALUE. VALUE is a Lisp object.
5707 VARIABLE should be a user option variable name, a Lisp variable
5708 meant to be customized by users. You should enter VALUE in Lisp syntax,
5709 so if you want VALUE to be a string, you must surround it with doublequotes.
5710 VALUE is used literally, not evaluated.
5712 If VARIABLE has a `variable-interactive' property, that is used as if
5713 it were the arg to `interactive' (which see) to interactively read VALUE.
5715 If VARIABLE has been defined with `defcustom', then the type information
5716 in the definition is used to check that VALUE is valid.
5718 With a prefix argument, set VARIABLE to VALUE buffer-locally."
5719 (interactive
5720 (let* ((default-var (variable-at-point))
5721 (var (if (user-variable-p default-var)
5722 (read-variable (format "Set variable (default %s): " default-var)
5723 default-var)
5724 (read-variable "Set variable: ")))
5725 (minibuffer-help-form '(describe-variable var))
5726 (prop (get var 'variable-interactive))
5727 (obsolete (car (get var 'byte-obsolete-variable)))
5728 (prompt (format "Set %s %s to value: " var
5729 (cond ((local-variable-p var)
5730 "(buffer-local)")
5731 ((or current-prefix-arg
5732 (local-variable-if-set-p var))
5733 "buffer-locally")
5734 (t "globally"))))
5735 (val (progn
5736 (when obsolete
5737 (message (concat "`%S' is obsolete; "
5738 (if (symbolp obsolete) "use `%S' instead" "%s"))
5739 var obsolete)
5740 (sit-for 3))
5741 (if prop
5742 ;; Use VAR's `variable-interactive' property
5743 ;; as an interactive spec for prompting.
5744 (call-interactively `(lambda (arg)
5745 (interactive ,prop)
5746 arg))
5747 (read
5748 (read-string prompt nil
5749 'set-variable-value-history
5750 (format "%S" (symbol-value var))))))))
5751 (list var val current-prefix-arg)))
5753 (and (custom-variable-p variable)
5754 (not (get variable 'custom-type))
5755 (custom-load-symbol variable))
5756 (let ((type (get variable 'custom-type)))
5757 (when type
5758 ;; Match with custom type.
5759 (require 'cus-edit)
5760 (setq type (widget-convert type))
5761 (unless (widget-apply type :match value)
5762 (error "Value `%S' does not match type %S of %S"
5763 value (car type) variable))))
5765 (if make-local
5766 (make-local-variable variable))
5768 (set variable value)
5770 ;; Force a thorough redisplay for the case that the variable
5771 ;; has an effect on the display, like `tab-width' has.
5772 (force-mode-line-update))
5773 \f
5774 ;; Define the major mode for lists of completions.
5776 (defvar completion-list-mode-map
5777 (let ((map (make-sparse-keymap)))
5778 (define-key map [mouse-2] 'mouse-choose-completion)
5779 (define-key map [follow-link] 'mouse-face)
5780 (define-key map [down-mouse-2] nil)
5781 (define-key map "\C-m" 'choose-completion)
5782 (define-key map "\e\e\e" 'delete-completion-window)
5783 (define-key map [left] 'previous-completion)
5784 (define-key map [right] 'next-completion)
5785 (define-key map "q" 'quit-window)
5786 map)
5787 "Local map for completion list buffers.")
5789 ;; Completion mode is suitable only for specially formatted data.
5790 (put 'completion-list-mode 'mode-class 'special)
5792 (defvar completion-reference-buffer nil
5793 "Record the buffer that was current when the completion list was requested.
5794 This is a local variable in the completion list buffer.
5795 Initial value is nil to avoid some compiler warnings.")
5797 (defvar completion-no-auto-exit nil
5798 "Non-nil means `choose-completion-string' should never exit the minibuffer.
5799 This also applies to other functions such as `choose-completion'.")
5801 (defvar completion-base-position nil
5802 "Position of the base of the text corresponding to the shown completions.
5803 This variable is used in the *Completions* buffers.
5804 Its value is a list of the form (START END) where START is the place
5805 where the completion should be inserted and END (if non-nil) is the end
5806 of the text to replace. If END is nil, point is used instead.")
5808 (defvar completion-base-size nil
5809 "Number of chars before point not involved in completion.
5810 This is a local variable in the completion list buffer.
5811 It refers to the chars in the minibuffer if completing in the
5812 minibuffer, or in `completion-reference-buffer' otherwise.
5813 Only characters in the field at point are included.
5815 If nil, Emacs determines which part of the tail end of the
5816 buffer's text is involved in completion by comparing the text
5817 directly.")
5818 (make-obsolete-variable 'completion-base-size 'completion-base-position "23.2")
5820 (defun delete-completion-window ()
5821 "Delete the completion list window.
5822 Go to the window from which completion was requested."
5823 (interactive)
5824 (let ((buf completion-reference-buffer))
5825 (if (one-window-p t)
5826 (if (window-dedicated-p (selected-window))
5827 (delete-frame (selected-frame)))
5828 (delete-window (selected-window))
5829 (if (get-buffer-window buf)
5830 (select-window (get-buffer-window buf))))))
5832 (defun previous-completion (n)
5833 "Move to the previous item in the completion list."
5834 (interactive "p")
5835 (next-completion (- n)))
5837 (defun next-completion (n)
5838 "Move to the next item in the completion list.
5839 With prefix argument N, move N items (negative N means move backward)."
5840 (interactive "p")
5841 (let ((beg (point-min)) (end (point-max)))
5842 (while (and (> n 0) (not (eobp)))
5843 ;; If in a completion, move to the end of it.
5844 (when (get-text-property (point) 'mouse-face)
5845 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
5846 ;; Move to start of next one.
5847 (unless (get-text-property (point) 'mouse-face)
5848 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
5849 (setq n (1- n)))
5850 (while (and (< n 0) (not (bobp)))
5851 (let ((prop (get-text-property (1- (point)) 'mouse-face)))
5852 ;; If in a completion, move to the start of it.
5853 (when (and prop (eq prop (get-text-property (point) 'mouse-face)))
5854 (goto-char (previous-single-property-change
5855 (point) 'mouse-face nil beg)))
5856 ;; Move to end of the previous completion.
5857 (unless (or (bobp) (get-text-property (1- (point)) 'mouse-face))
5858 (goto-char (previous-single-property-change
5859 (point) 'mouse-face nil beg)))
5860 ;; Move to the start of that one.
5861 (goto-char (previous-single-property-change
5862 (point) 'mouse-face nil beg))
5863 (setq n (1+ n))))))
5865 (defun choose-completion (&optional event)
5866 "Choose the completion at point."
5867 (interactive (list last-nonmenu-event))
5868 ;; In case this is run via the mouse, give temporary modes such as
5869 ;; isearch a chance to turn off.
5870 (run-hooks 'mouse-leave-buffer-hook)
5871 (let (buffer base-size base-position choice)
5872 (with-current-buffer (window-buffer (posn-window (event-start event)))
5873 (setq buffer completion-reference-buffer)
5874 (setq base-size completion-base-size)
5875 (setq base-position completion-base-position)
5876 (save-excursion
5877 (goto-char (posn-point (event-start event)))
5878 (let (beg end)
5879 (if (and (not (eobp)) (get-text-property (point) 'mouse-face))
5880 (setq end (point) beg (1+ (point))))
5881 (if (and (not (bobp)) (get-text-property (1- (point)) 'mouse-face))
5882 (setq end (1- (point)) beg (point)))
5883 (if (null beg)
5884 (error "No completion here"))
5885 (setq beg (previous-single-property-change beg 'mouse-face))
5886 (setq end (or (next-single-property-change end 'mouse-face)
5887 (point-max)))
5888 (setq choice (buffer-substring-no-properties beg end)))))
5890 (let ((owindow (selected-window)))
5891 (select-window (posn-window (event-start event)))
5892 (if (and (one-window-p t 'selected-frame)
5893 (window-dedicated-p (selected-window)))
5894 ;; This is a special buffer's frame
5895 (iconify-frame (selected-frame))
5896 (or (window-dedicated-p (selected-window))
5897 (bury-buffer)))
5898 (select-window
5899 (or (and (buffer-live-p buffer)
5900 (get-buffer-window buffer 0))
5901 owindow)))
5903 (choose-completion-string
5904 choice buffer
5905 (or base-position
5906 (when base-size
5907 ;; Someone's using old completion code that doesn't know
5908 ;; about base-position yet.
5909 (list (+ base-size (with-current-buffer buffer (field-beginning)))))
5910 ;; If all else fails, just guess.
5911 (with-current-buffer buffer
5912 (list (choose-completion-guess-base-position choice)))))))
5914 ;; Delete the longest partial match for STRING
5915 ;; that can be found before POINT.
5916 (defun choose-completion-guess-base-position (string)
5917 (save-excursion
5918 (let ((opoint (point))
5919 len)
5920 ;; Try moving back by the length of the string.
5921 (goto-char (max (- (point) (length string))
5922 (minibuffer-prompt-end)))
5923 ;; See how far back we were actually able to move. That is the
5924 ;; upper bound on how much we can match and delete.
5925 (setq len (- opoint (point)))
5926 (if completion-ignore-case
5927 (setq string (downcase string)))
5928 (while (and (> len 0)
5929 (let ((tail (buffer-substring (point) opoint)))
5930 (if completion-ignore-case
5931 (setq tail (downcase tail)))
5932 (not (string= tail (substring string 0 len)))))
5933 (setq len (1- len))
5934 (forward-char 1))
5935 (point))))
5937 (defun choose-completion-delete-max-match (string)
5938 (delete-region (choose-completion-guess-base-position string) (point)))
5939 (make-obsolete 'choose-completion-delete-max-match
5940 'choose-completion-guess-base-position "23.2")
5942 (defvar choose-completion-string-functions nil
5943 "Functions that may override the normal insertion of a completion choice.
5944 These functions are called in order with four arguments:
5945 CHOICE - the string to insert in the buffer,
5946 BUFFER - the buffer in which the choice should be inserted,
5947 MINI-P - non-nil if BUFFER is a minibuffer, and
5948 BASE-SIZE - the number of characters in BUFFER before
5949 the string being completed.
5951 If a function in the list returns non-nil, that function is supposed
5952 to have inserted the CHOICE in the BUFFER, and possibly exited
5953 the minibuffer; no further functions will be called.
5955 If all functions in the list return nil, that means to use
5956 the default method of inserting the completion in BUFFER.")
5958 (defun choose-completion-string (choice &optional buffer base-position)
5959 "Switch to BUFFER and insert the completion choice CHOICE.
5960 BASE-POSITION, says where to insert the completion."
5962 ;; If BUFFER is the minibuffer, exit the minibuffer
5963 ;; unless it is reading a file name and CHOICE is a directory,
5964 ;; or completion-no-auto-exit is non-nil.
5966 ;; Some older code may call us passing `base-size' instead of
5967 ;; `base-position'. It's difficult to make any use of `base-size',
5968 ;; so we just ignore it.
5969 (unless (consp base-position)
5970 (message "Obsolete `base-size' passed to choose-completion-string")
5971 (setq base-position nil))
5973 (let* ((buffer (or buffer completion-reference-buffer))
5974 (mini-p (minibufferp buffer)))
5975 ;; If BUFFER is a minibuffer, barf unless it's the currently
5976 ;; active minibuffer.
5977 (if (and mini-p
5978 (or (not (active-minibuffer-window))
5979 (not (equal buffer
5980 (window-buffer (active-minibuffer-window))))))
5981 (error "Minibuffer is not active for completion")
5982 ;; Set buffer so buffer-local choose-completion-string-functions works.
5983 (set-buffer buffer)
5984 (unless (run-hook-with-args-until-success
5985 'choose-completion-string-functions
5986 ;; The fourth arg used to be `mini-p' but was useless
5987 ;; (since minibufferp can be used on the `buffer' arg)
5988 ;; and indeed unused. The last used to be `base-size', so we
5989 ;; keep it to try and avoid breaking old code.
5990 choice buffer base-position nil)
5991 ;; Insert the completion into the buffer where it was requested.
5992 (delete-region (or (car base-position) (point))
5993 (or (cadr base-position) (point)))
5994 (insert choice)
5995 (remove-text-properties (- (point) (length choice)) (point)
5996 '(mouse-face nil))
5997 ;; Update point in the window that BUFFER is showing in.
5998 (let ((window (get-buffer-window buffer t)))
5999 (set-window-point window (point)))
6000 ;; If completing for the minibuffer, exit it with this choice.
6001 (and (not completion-no-auto-exit)
6002 (minibufferp buffer)
6003 minibuffer-completion-table
6004 ;; If this is reading a file name, and the file name chosen
6005 ;; is a directory, don't exit the minibuffer.
6006 (let* ((result (buffer-substring (field-beginning) (point)))
6007 (bounds
6008 (completion-boundaries result minibuffer-completion-table
6009 minibuffer-completion-predicate
6010 "")))
6011 (if (eq (car bounds) (length result))
6012 ;; The completion chosen leads to a new set of completions
6013 ;; (e.g. it's a directory): don't exit the minibuffer yet.
6014 (let ((mini (active-minibuffer-window)))
6015 (select-window mini)
6016 (when minibuffer-auto-raise
6017 (raise-frame (window-frame mini))))
6018 (exit-minibuffer))))))))
6020 (define-derived-mode completion-list-mode nil "Completion List"
6021 "Major mode for buffers showing lists of possible completions.
6023 to select the completion near point.
6025 with the mouse.
6028 (set (make-local-variable 'completion-base-size) nil))
6030 (defun completion-list-mode-finish ()
6031 "Finish setup of the completions buffer.
6032 Called from `temp-buffer-show-hook'."
6033 (when (eq major-mode 'completion-list-mode)
6034 (toggle-read-only 1)))
6036 (add-hook 'temp-buffer-show-hook 'completion-list-mode-finish)
6039 ;; Variables and faces used in `completion-setup-function'.
6041 (defcustom completion-show-help t
6042 "Non-nil means show help message in *Completions* buffer."
6043 :type 'boolean
6044 :version "22.1"
6045 :group 'completion)
6047 ;; This function goes in completion-setup-hook, so that it is called
6048 ;; after the text of the completion list buffer is written.
6049 (defun completion-setup-function ()
6050 (let* ((mainbuf (current-buffer))
6051 (base-dir
6052 ;; When reading a file name in the minibuffer,
6053 ;; try and find the right default-directory to set in the
6054 ;; completion list buffer.
6055 ;; FIXME: Why do we do that, actually? --Stef
6056 (if minibuffer-completing-file-name
6057 (file-name-as-directory
6058 (expand-file-name
6059 (substring (minibuffer-completion-contents)
6060 0 (or completion-base-size 0)))))))
6061 (with-current-buffer standard-output
6062 (let ((base-size completion-base-size) ;Read before killing localvars.
6063 (base-position completion-base-position))
6064 (completion-list-mode)
6065 (set (make-local-variable 'completion-base-size) base-size)
6066 (set (make-local-variable 'completion-base-position) base-position))
6067 (set (make-local-variable 'completion-reference-buffer) mainbuf)
6068 (if base-dir (setq default-directory base-dir))
6069 ;; Maybe insert help string.
6070 (when completion-show-help
6071 (goto-char (point-min))
6072 (if (display-mouse-p)
6073 (insert (substitute-command-keys
6075 (insert (substitute-command-keys
6079 (add-hook 'completion-setup-hook 'completion-setup-function)
6081 (define-key minibuffer-local-completion-map [prior] 'switch-to-completions)
6082 (define-key minibuffer-local-completion-map "\M-v" 'switch-to-completions)
6084 (defun switch-to-completions ()
6085 "Select the completion list window."
6086 (interactive)
6087 (let ((window (or (get-buffer-window "*Completions*" 0)
6088 ;; Make sure we have a completions window.
6089 (progn (minibuffer-completion-help)
6090 (get-buffer-window "*Completions*" 0)))))
6091 (when window
6092 (select-window window)
6093 ;; In the new buffer, go to the first completion.
6094 ;; FIXME: Perhaps this should be done in `minibuffer-completion-help'.
6095 (when (bobp)
6096 (next-completion 1)))))
6097 \f
6098 ;;; Support keyboard commands to turn on various modifiers.
6100 ;; These functions -- which are not commands -- each add one modifier
6101 ;; to the following event.
6103 (defun event-apply-alt-modifier (ignore-prompt)
6106 (vector (event-apply-modifier (read-event) 'alt 22 "A-")))
6107 (defun event-apply-super-modifier (ignore-prompt)
6110 (vector (event-apply-modifier (read-event) 'super 23 "s-")))
6111 (defun event-apply-hyper-modifier (ignore-prompt)
6114 (vector (event-apply-modifier (read-event) 'hyper 24 "H-")))
6115 (defun event-apply-shift-modifier (ignore-prompt)
6118 (vector (event-apply-modifier (read-event) 'shift 25 "S-")))
6119 (defun event-apply-control-modifier (ignore-prompt)
6122 (vector (event-apply-modifier (read-event) 'control 26 "C-")))
6123 (defun event-apply-meta-modifier (ignore-prompt)
6126 (vector (event-apply-modifier (read-event) 'meta 27 "M-")))
6128 (defun event-apply-modifier (event symbol lshiftby prefix)
6129 "Apply a modifier flag to event EVENT.
6130 SYMBOL is the name of this modifier, as a symbol.
6131 LSHIFTBY is the numeric value of this modifier, in keyboard events.
6132 PREFIX is the string that represents this modifier in an event type symbol."
6133 (if (numberp event)
6134 (cond ((eq symbol 'control)
6135 (if (and (<= (downcase event) ?z)
6136 (>= (downcase event) ?a))
6137 (- (downcase event) ?a -1)
6138 (if (and (<= (downcase event) ?Z)
6139 (>= (downcase event) ?A))
6140 (- (downcase event) ?A -1)
6141 (logior (lsh 1 lshiftby) event))))
6142 ((eq symbol 'shift)
6143 (if (and (<= (downcase event) ?z)
6144 (>= (downcase event) ?a))
6145 (upcase event)
6146 (logior (lsh 1 lshiftby) event)))
6147 (t
6148 (logior (lsh 1 lshiftby) event)))
6149 (if (memq symbol (event-modifiers event))
6150 event
6151 (let ((event-type (if (symbolp event) event (car event))))
6152 (setq event-type (intern (concat prefix (symbol-name event-type))))
6153 (if (symbolp event)
6154 event-type
6155 (cons event-type (cdr event)))))))
6157 (define-key function-key-map [?\C-x ?@ ?h] 'event-apply-hyper-modifier)
6158 (define-key function-key-map [?\C-x ?@ ?s] 'event-apply-super-modifier)
6159 (define-key function-key-map [?\C-x ?@ ?m] 'event-apply-meta-modifier)
6160 (define-key function-key-map [?\C-x ?@ ?a] 'event-apply-alt-modifier)
6161 (define-key function-key-map [?\C-x ?@ ?S] 'event-apply-shift-modifier)
6162 (define-key function-key-map [?\C-x ?@ ?c] 'event-apply-control-modifier)
6163 \f
6164 ;;;; Keypad support.
6166 ;; Make the keypad keys act like ordinary typing keys. If people add
6167 ;; bindings for the function key symbols, then those bindings will
6168 ;; override these, so this shouldn't interfere with any existing
6169 ;; bindings.
6171 ;; Also tell read-char how to handle these keys.
6172 (mapc
6173 (lambda (keypad-normal)
6174 (let ((keypad (nth 0 keypad-normal))
6175 (normal (nth 1 keypad-normal)))
6176 (put keypad 'ascii-character normal)
6177 (define-key function-key-map (vector keypad) (vector normal))))
6178 '((kp-0 ?0) (kp-1 ?1) (kp-2 ?2) (kp-3 ?3) (kp-4 ?4)
6179 (kp-5 ?5) (kp-6 ?6) (kp-7 ?7) (kp-8 ?8) (kp-9 ?9)
6180 (kp-space ?\s)
6183 (kp-multiply ?*)
6184 (kp-add ?+)
6185 (kp-separator ?,)
6186 (kp-subtract ?-)
6187 (kp-decimal ?.)
6188 (kp-divide ?/)
6189 (kp-equal ?=)
6190 ;; Do the same for various keys that are represented as symbols under
6191 ;; GUIs but naturally correspond to characters.
6192 (backspace 127)
6193 (delete 127)
6196 (clear ?\C-l)
6197 (return ?\C-m)
6198 (escape ?\e)
6199 ))
6200 \f
6201 ;;;;
6202 ;;;; forking a twin copy of a buffer.
6203 ;;;;
6205 (defvar clone-buffer-hook nil
6206 "Normal hook to run in the new buffer at the end of `clone-buffer'.")
6208 (defvar clone-indirect-buffer-hook nil
6209 "Normal hook to run in the new buffer at the end of `clone-indirect-buffer'.")
6211 (defun clone-process (process &optional newname)
6212 "Create a twin copy of PROCESS.
6213 If NEWNAME is nil, it defaults to PROCESS' name;
6214 NEWNAME is modified by adding or incrementing <N> at the end as necessary.
6215 If PROCESS is associated with a buffer, the new process will be associated
6216 with the current buffer instead.
6217 Returns nil if PROCESS has already terminated."
6218 (setq newname (or newname (process-name process)))
6220 (setq newname (substring newname 0 (match-beginning 0))))
6221 (when (memq (process-status process) '(run stop open))
6222 (let* ((process-connection-type (process-tty-name process))
6223 (new-process
6224 (if (memq (process-status process) '(open))
6225 (let ((args (process-contact process t)))
6226 (setq args (plist-put args :name newname))
6227 (setq args (plist-put args :buffer
6228 (if (process-buffer process)
6229 (current-buffer))))
6230 (apply 'make-network-process args))
6231 (apply 'start-process newname
6232 (if (process-buffer process) (current-buffer))
6233 (process-command process)))))
6234 (set-process-query-on-exit-flag
6235 new-process (process-query-on-exit-flag process))
6236 (set-process-inherit-coding-system-flag
6237 new-process (process-inherit-coding-system-flag process))
6238 (set-process-filter new-process (process-filter process))
6239 (set-process-sentinel new-process (process-sentinel process))
6240 (set-process-plist new-process (copy-sequence (process-plist process)))
6241 new-process)))
6243 ;; things to maybe add (currently partly covered by `funcall mode'):
6244 ;; - syntax-table
6245 ;; - overlays
6246 (defun clone-buffer (&optional newname display-flag)
6247 "Create and return a twin copy of the current buffer.
6248 Unlike an indirect buffer, the new buffer can be edited
6249 independently of the old one (if it is not read-only).
6250 NEWNAME is the name of the new buffer. It may be modified by
6251 adding or incrementing <N> at the end as necessary to create a
6252 unique buffer name. If nil, it defaults to the name of the
6253 current buffer, with the proper suffix. If DISPLAY-FLAG is
6254 non-nil, the new buffer is shown with `pop-to-buffer'. Trying to
6255 clone a file-visiting buffer, or a buffer whose major mode symbol
6256 has a non-nil `no-clone' property, results in an error.
6258 Interactively, DISPLAY-FLAG is t and NEWNAME is the name of the
6259 current buffer with appropriate suffix. However, if a prefix
6260 argument is given, then the command prompts for NEWNAME in the
6261 minibuffer.
6263 This runs the normal hook `clone-buffer-hook' in the new buffer
6264 after it has been set up properly in other respects."
6265 (interactive
6266 (progn
6267 (if buffer-file-name
6268 (error "Cannot clone a file-visiting buffer"))
6269 (if (get major-mode 'no-clone)
6270 (error "Cannot clone a buffer in %s mode" mode-name))
6271 (list (if current-prefix-arg
6272 (read-buffer "Name of new cloned buffer: " (current-buffer)))
6273 t)))
6274 (if buffer-file-name
6275 (error "Cannot clone a file-visiting buffer"))
6276 (if (get major-mode 'no-clone)
6277 (error "Cannot clone a buffer in %s mode" mode-name))
6278 (setq newname (or newname (buffer-name)))
6280 (setq newname (substring newname 0 (match-beginning 0))))
6281 (let ((buf (current-buffer))
6282 (ptmin (point-min))
6283 (ptmax (point-max))
6284 (pt (point))
6285 (mk (if mark-active (mark t)))
6286 (modified (buffer-modified-p))
6287 (mode major-mode)
6288 (lvars (buffer-local-variables))
6289 (process (get-buffer-process (current-buffer)))
6290 (new (generate-new-buffer (or newname (buffer-name)))))
6291 (save-restriction
6292 (widen)
6293 (with-current-buffer new
6294 (insert-buffer-substring buf)))
6295 (with-current-buffer new
6296 (narrow-to-region ptmin ptmax)
6297 (goto-char pt)
6298 (if mk (set-mark mk))
6299 (set-buffer-modified-p modified)
6301 ;; Clone the old buffer's process, if any.
6302 (when process (clone-process process))
6304 ;; Now set up the major mode.
6305 (funcall mode)
6307 ;; Set up other local variables.
6308 (mapc (lambda (v)
6309 (condition-case () ;in case var is read-only
6310 (if (symbolp v)
6311 (makunbound v)
6312 (set (make-local-variable (car v)) (cdr v)))
6313 (error nil)))
6314 lvars)
6316 ;; Run any hooks (typically set up by the major mode
6317 ;; for cloning to work properly).
6318 (run-hooks 'clone-buffer-hook))
6319 (if display-flag
6320 ;; Presumably the current buffer is shown in the selected frame, so
6321 ;; we want to display the clone elsewhere.
6322 (let ((same-window-regexps nil)
6323 (same-window-buffer-names))
6324 (pop-to-buffer new)))
6325 new))
6328 (defun clone-indirect-buffer (newname display-flag &optional norecord)
6329 "Create an indirect buffer that is a twin copy of the current buffer.
6331 Give the indirect buffer name NEWNAME. Interactively, read NEWNAME
6332 from the minibuffer when invoked with a prefix arg. If NEWNAME is nil
6333 or if not called with a prefix arg, NEWNAME defaults to the current
6334 buffer's name. The name is modified by adding a `<N>' suffix to it
6335 or by incrementing the N in an existing suffix. Trying to clone a
6336 buffer whose major mode symbol has a non-nil `no-clone-indirect'
6337 property results in an error.
6339 DISPLAY-FLAG non-nil means show the new buffer with `pop-to-buffer'.
6340 This is always done when called interactively.
6342 Optional third arg NORECORD non-nil means do not put this buffer at the
6343 front of the list of recently selected ones."
6344 (interactive
6345 (progn
6346 (if (get major-mode 'no-clone-indirect)
6347 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6348 (list (if current-prefix-arg
6349 (read-buffer "Name of indirect buffer: " (current-buffer)))
6350 t)))
6351 (if (get major-mode 'no-clone-indirect)
6352 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6353 (setq newname (or newname (buffer-name)))
6355 (setq newname (substring newname 0 (match-beginning 0))))
6356 (let* ((name (generate-new-buffer-name newname))
6357 (buffer (make-indirect-buffer (current-buffer) name t)))
6358 (with-current-buffer buffer
6359 (run-hooks 'clone-indirect-buffer-hook))
6360 (when display-flag
6361 (pop-to-buffer buffer norecord))
6362 buffer))
6365 (defun clone-indirect-buffer-other-window (newname display-flag &optional norecord)
6366 "Like `clone-indirect-buffer' but display in another window."
6367 (interactive
6368 (progn
6369 (if (get major-mode 'no-clone-indirect)
6370 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
6371 (list (if current-prefix-arg
6372 (read-buffer "Name of indirect buffer: " (current-buffer)))
6373 t)))
6374 (let ((pop-up-windows t))
6375 (clone-indirect-buffer newname display-flag norecord)))
6377 \f
6378 ;;; Handling of Backspace and Delete keys.
6380 (defcustom normal-erase-is-backspace 'maybe
6381 "Set the default behavior of the Delete and Backspace keys.
6383 If set to t, Delete key deletes forward and Backspace key deletes
6384 backward.
6386 If set to nil, both Delete and Backspace keys delete backward.
6388 If set to 'maybe (which is the default), Emacs automatically
6389 selects a behavior. On window systems, the behavior depends on
6390 the keyboard used. If the keyboard has both a Backspace key and
6391 a Delete key, and both are mapped to their usual meanings, the
6392 option's default value is set to t, so that Backspace can be used
6393 to delete backward, and Delete can be used to delete forward.
6395 If not running under a window system, customizing this option
6396 accomplishes a similar effect by mapping C-h, which is usually
6397 generated by the Backspace key, to DEL, and by mapping DEL to C-d
6398 via `keyboard-translate'. The former functionality of C-h is
6399 available on the F1 key. You should probably not use this
6400 setting if you don't have both Backspace, Delete and F1 keys.
6402 Setting this variable with setq doesn't take effect. Programmatically,
6403 call `normal-erase-is-backspace-mode' (which see) instead."
6404 :type '(choice (const :tag "Off" nil)
6405 (const :tag "Maybe" maybe)
6406 (other :tag "On" t))
6407 :group 'editing-basics
6408 :version "21.1"
6409 :set (lambda (symbol value)
6410 ;; The fboundp is because of a problem with :set when
6411 ;; dumping Emacs. It doesn't really matter.
6412 (if (fboundp 'normal-erase-is-backspace-mode)
6413 (normal-erase-is-backspace-mode (or value 0))
6414 (set-default symbol value))))
6416 (defun normal-erase-is-backspace-setup-frame (&optional frame)
6417 "Set up `normal-erase-is-backspace-mode' on FRAME, if necessary."
6418 (unless frame (setq frame (selected-frame)))
6419 (with-selected-frame frame
6420 (unless (terminal-parameter nil 'normal-erase-is-backspace)
6421 (normal-erase-is-backspace-mode
6422 (if (if (eq normal-erase-is-backspace 'maybe)
6423 (and (not noninteractive)
6424 (or (memq system-type '(ms-dos windows-nt))
6425 (and (memq window-system '(x))
6426 (fboundp 'x-backspace-delete-keys-p)
6427 (x-backspace-delete-keys-p))
6428 ;; If the terminal Emacs is running on has erase char
6429 ;; set to ^H, use the Backspace key for deleting
6430 ;; backward, and the Delete key for deleting forward.
6431 (and (null window-system)
6432 (eq tty-erase-char ?\^H))))
6433 normal-erase-is-backspace)
6434 1 0)))))
6436 (defun normal-erase-is-backspace-mode (&optional arg)
6437 "Toggle the Erase and Delete mode of the Backspace and Delete keys.
6439 With numeric ARG, turn the mode on if and only if ARG is positive.
6441 On window systems, when this mode is on, Delete is mapped to C-d
6442 and Backspace is mapped to DEL; when this mode is off, both
6443 Delete and Backspace are mapped to DEL. (The remapping goes via
6444 `local-function-key-map', so binding Delete or Backspace in the
6445 global or local keymap will override that.)
6447 In addition, on window systems, the bindings of C-Delete, M-Delete,
6448 C-M-Delete, C-Backspace, M-Backspace, and C-M-Backspace are changed in
6449 the global keymap in accordance with the functionality of Delete and
6450 Backspace. For example, if Delete is remapped to C-d, which deletes
6451 forward, C-Delete is bound to `kill-word', but if Delete is remapped
6452 to DEL, which deletes backward, C-Delete is bound to
6453 `backward-kill-word'.
6455 If not running on a window system, a similar effect is accomplished by
6456 remapping C-h (normally produced by the Backspace key) and DEL via
6457 `keyboard-translate': if this mode is on, C-h is mapped to DEL and DEL
6458 to C-d; if it's off, the keys are not remapped.
6460 When not running on a window system, and this mode is turned on, the
6461 former functionality of C-h is available on the F1 key. You should
6462 probably not turn on this mode on a text-only terminal if you don't
6463 have both Backspace, Delete and F1 keys.
6465 See also `normal-erase-is-backspace'."
6466 (interactive "P")
6467 (let ((enabled (or (and arg (> (prefix-numeric-value arg) 0))
6468 (not (or arg
6469 (eq 1 (terminal-parameter
6470 nil 'normal-erase-is-backspace)))))))
6471 (set-terminal-parameter nil 'normal-erase-is-backspace
6472 (if enabled 1 0))
6474 (cond ((or (memq window-system '(x w32 ns pc))
6475 (memq system-type '(ms-dos windows-nt)))
6476 (let* ((bindings
6477 `(([M-delete] [M-backspace])
6478 ([C-M-delete] [C-M-backspace])
6479 ([?\e C-delete] [?\e C-backspace])))
6480 (old-state (lookup-key local-function-key-map [delete])))
6482 (if enabled
6483 (progn
6484 (define-key local-function-key-map [delete] [?\C-d])
6485 (define-key local-function-key-map [kp-delete] [?\C-d])
6486 (define-key local-function-key-map [backspace] [?\C-?])
6487 (dolist (b bindings)
6488 ;; Not sure if input-decode-map is really right, but
6489 ;; keyboard-translate-table (used below) only works
6490 ;; for integer events, and key-translation-table is
6491 ;; global (like the global-map, used earlier).
6492 (define-key input-decode-map (car b) nil)
6493 (define-key input-decode-map (cadr b) nil)))
6494 (define-key local-function-key-map [delete] [?\C-?])
6495 (define-key local-function-key-map [kp-delete] [?\C-?])
6496 (define-key local-function-key-map [backspace] [?\C-?])
6497 (dolist (b bindings)
6498 (define-key input-decode-map (car b) (cadr b))
6499 (define-key input-decode-map (cadr b) (car b))))))
6500 (t
6501 (if enabled
6502 (progn
6503 (keyboard-translate ?\C-h ?\C-?)
6504 (keyboard-translate ?\C-? ?\C-d))
6505 (keyboard-translate ?\C-h ?\C-h)
6506 (keyboard-translate ?\C-? ?\C-?))))
6508 (run-hooks 'normal-erase-is-backspace-hook)
6509 (if (called-interactively-p 'interactive)
6510 (message "Delete key deletes %s"
6511 (if (eq 1 (terminal-parameter nil 'normal-erase-is-backspace))
6512 "forward" "backward")))))
6513 \f
6514 (defvar vis-mode-saved-buffer-invisibility-spec nil
6515 "Saved value of `buffer-invisibility-spec' when Visible mode is on.")
6517 (define-minor-mode visible-mode
6518 "Toggle Visible mode.
6519 With argument ARG turn Visible mode on if ARG is positive, otherwise
6520 turn it off.
6522 Enabling Visible mode makes all invisible text temporarily visible.
6523 Disabling Visible mode turns off that effect. Visible mode works by
6524 saving the value of `buffer-invisibility-spec' and setting it to nil."
6525 :lighter " Vis"
6526 :group 'editing-basics
6527 (when (local-variable-p 'vis-mode-saved-buffer-invisibility-spec)
6528 (setq buffer-invisibility-spec vis-mode-saved-buffer-invisibility-spec)
6529 (kill-local-variable 'vis-mode-saved-buffer-invisibility-spec))
6530 (when visible-mode
6531 (set (make-local-variable 'vis-mode-saved-buffer-invisibility-spec)
6532 buffer-invisibility-spec)
6533 (setq buffer-invisibility-spec nil)))
6534 \f
6535 ;; Partial application of functions (similar to "currying").
6536 ;; This function is here rather than in subr.el because it uses CL.
6537 (defun apply-partially (fun &rest args)
6538 "Return a function that is a partial application of FUN to ARGS.
6539 ARGS is a list of the first N arguments to pass to FUN.
6540 The result is a new function which does the same as FUN, except that
6541 the first N arguments are fixed at the values with which this function
6542 was called."
6543 (lexical-let ((fun fun) (args1 args))
6544 (lambda (&rest args2) (apply fun (append args1 args2)))))
6546 ;; This function is here rather than in subr.el because it uses CL.
6547 (defmacro with-wrapper-hook (var args &rest body)
6548 "Run BODY wrapped with the VAR hook.
6549 VAR is a special hook: its functions are called with a first argument
6551 the original function, or call it any number of times (including not calling
6552 it at all). This is similar to an `around' advice.
6553 VAR is normally a symbol (a variable) in which case it is treated like
6554 a hook, with a buffer-local and a global part. But it can also be an
6555 arbitrary expression.
6556 ARGS is a list of variables which will be passed as additional arguments
6557 to each function, after the initial argument, and which the first argument
6558 expects to receive when called."
6559 (declare (indent 2) (debug t))
6560 ;; We need those two gensyms because CL's lexical scoping is not available
6561 ;; for function arguments :-(
6562 (let ((funs (make-symbol "funs"))
6563 (global (make-symbol "global"))
6564 (argssym (make-symbol "args")))
6565 ;; Since the hook is a wrapper, the loop has to be done via
6566 ;; recursion: a given hook function will call its parameter in order to
6567 ;; continue looping.
6568 `(labels ((runrestofhook (,funs ,global ,argssym)
6569 ;; `funs' holds the functions left on the hook and `global'
6570 ;; holds the functions left on the global part of the hook
6571 ;; (in case the hook is local).
6572 (lexical-let ((funs ,funs)
6573 (global ,global))
6574 (if (consp funs)
6575 (if (eq t (car funs))
6576 (runrestofhook
6577 (append global (cdr funs)) nil ,argssym)
6578 (apply (car funs)
6579 (lambda (&rest ,argssym)
6580 (runrestofhook (cdr funs) global ,argssym))
6581 ,argssym))
6582 ;; Once there are no more functions on the hook, run
6583 ;; the original body.
6584 (apply (lambda ,args ,@body) ,argssym)))))
6585 (runrestofhook ,var
6586 ;; The global part of the hook, if any.
6587 ,(if (symbolp var)
6588 `(if (local-variable-p ',var)
6589 (default-value ',var)))
6590 (list ,@args)))))
6591 \f
6592 ;; Minibuffer prompt stuff.
6594 ;(defun minibuffer-prompt-modification (start end)
6595 ; (error "You cannot modify the prompt"))
6596 ;
6597 ;
6598 ;(defun minibuffer-prompt-insertion (start end)
6599 ; (let ((inhibit-modification-hooks t))
6600 ; (delete-region start end)
6601 ; ;; Discard undo information for the text insertion itself
6602 ; ;; and for the text deletion.above.
6603 ; (when (consp buffer-undo-list)
6604 ; (setq buffer-undo-list (cddr buffer-undo-list)))
6605 ; (message "You cannot modify the prompt")))
6606 ;
6607 ;
6608 ;(setq minibuffer-prompt-properties
6609 ; (list 'modification-hooks '(minibuffer-prompt-modification)
6610 ; 'insert-in-front-hooks '(minibuffer-prompt-insertion)))
6611 ;
6613 \f
6614 ;;;; Problematic external packages.
6616 ;; rms says this should be done by specifying symbols that define
6617 ;; versions together with bad values. This is therefore not as
6618 ;; flexible as it could be. See the thread:
6619 ;; http://lists.gnu.org/archive/html/emacs-devel/2007-08/msg00300.html
6620 (defconst bad-packages-alist
6621 ;; Not sure exactly which semantic versions have problems.
6622 ;; Definitely 2.0pre3, probably all 2.0pre's before this.
6624 "The version of `semantic' loaded does not work in Emacs 22.
6625 It can cause constant high CPU load.
6626 Upgrade to at least Semantic 2.0pre4 (distributed with CEDET 1.0pre4).")
6627 ;; CUA-mode does not work with GNU Emacs version 22.1 and newer.
6628 ;; Except for version 1.2, all of the 1.x and 2.x version of cua-mode
6629 ;; provided the `CUA-mode' feature. Since this is no longer true,
6630 ;; we can warn the user if the `CUA-mode' feature is ever provided.
6631 (CUA-mode t nil
6632 "CUA-mode is now part of the standard GNU Emacs distribution,
6633 so you can now enable CUA via the Options menu or by customizing `cua-mode'.
6635 You have loaded an older version of CUA-mode which does not work
6636 correctly with this version of Emacs. You should remove the old
6637 version and use the one distributed with Emacs."))
6638 "Alist of packages known to cause problems in this version of Emacs.
6639 Each element has the form (PACKAGE SYMBOL REGEXP STRING).
6640 PACKAGE is either a regular expression to match file names, or a
6641 symbol (a feature name); see the documentation of
6642 `after-load-alist', to which this variable adds functions.
6643 SYMBOL is either the name of a string variable, or `t'. Upon
6644 loading PACKAGE, if SYMBOL is t or matches REGEXP, display a
6645 warning using STRING as the message.")
6647 (defun bad-package-check (package)
6648 "Run a check using the element from `bad-packages-alist' matching PACKAGE."
6649 (condition-case nil
6650 (let* ((list (assoc package bad-packages-alist))
6651 (symbol (nth 1 list)))
6652 (and list
6653 (boundp symbol)
6654 (or (eq symbol t)
6655 (and (stringp (setq symbol (eval symbol)))
6656 (string-match-p (nth 2 list) symbol)))
6657 (display-warning package (nth 3 list) :warning)))
6658 (error nil)))
6660 (mapc (lambda (elem)
6661 (eval-after-load (car elem) `(bad-package-check ',(car elem))))
6662 bad-packages-alist)
6665 (provide 'simple)
6667 ;;; simple.el ends here