| blob | 8df53b6664c1deeb6c9e50d5e65be7f01503b01d |
1 ;;; simple.el --- basic editing commands for Emacs
3 ;; Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 ;; 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
6 ;; Maintainer: FSF
7 ;; Keywords: internal
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
26 ;;; Commentary:
28 ;; A grab-bag of basic Emacs commands not specifically related to some
29 ;; major mode or to file-handling.
31 ;;; Code:
40 "*Idle time delay before updating various things on the screen.
41 Various Emacs features that update auxiliary information when point moves
42 wait this many seconds after Emacs becomes idle before doing an update."
48 "Killing and yanking commands."
52 "Highlight (un)matching of parens and expressions."
56 "Search LIST for a valid buffer to display in FRAME.
57 Return nil when all buffers in LIST are undesirable for display,
58 otherwise return the first suitable buffer in LIST.
60 Buffers not visible in windows are preferred to visible buffers,
61 unless VISIBLE-OK is non-nil.
62 If the optional argument FRAME is nil, it defaults to the selected frame.
63 If BUFFER is non-nil, ignore occurrences of that buffer in LIST."
64 ;; This logic is more or less copied from other-buffer.
67 found buf)
80 "Return the last non-hidden displayable buffer in the buffer list.
81 If BUFFER is non-nil, last-buffer will ignore that buffer.
82 Buffers not visible in windows are preferred to visible buffers,
83 unless optional argument VISIBLE-OK is non-nil.
84 If the optional third argument FRAME is non-nil, use that frame's
85 buffer list instead of the selected frame's buffer list.
86 If no other buffer exists, the buffer `*scratch*' is returned."
89 buffer visible-ok frame)
91 buffer visible-ok frame)
97 "Switch to the next buffer in cyclic order."
107 "Switch to the previous buffer in cyclic order."
112 ;; Clean up buried-buffer-list up to and including the chosen buffer.
117 \f
118 ;;; next-error support framework
121 "`next-error' support framework."
127 "Face used to highlight next error locus."
132 "*Highlighting of locations in selected source buffers.
133 If number, highlight the locus in `next-error' face for given time in seconds.
134 If t, use persistent overlays fontified in `next-error' face.
135 If nil, don't highlight the locus in the source buffer.
136 If `fringe-arrow', indicate the locus by the fringe arrow."
145 "*Highlighting of locations in non-selected source buffers.
146 If number, highlight the locus in `next-error' face for given time in seconds.
147 If t, use persistent overlays fontified in `next-error' face.
148 If nil, don't highlight the locus in the source buffer.
149 If `fringe-arrow', indicate the locus by the fringe arrow."
158 "*List of hook functions run by `next-error' after visiting source file."
169 "The most recent `next-error' buffer.
170 A buffer becomes most recent when its compilation, grep, or
175 "Function to use to find the next error in the current buffer.
176 The function is called with 2 parameters:
177 ARG is an integer specifying by how many errors to move.
178 RESET is a boolean which, if non-nil, says to go back to the beginning
179 of the errors before moving.
180 Major modes providing compile-like functionality should set this variable
181 to indicate to `next-error' that this is a candidate buffer and how
187 &optional avoid-current
188 extra-test-inclusive
189 extra-test-exclusive)
190 "Test if BUFFER is a `next-error' capable buffer.
192 If AVOID-CURRENT is non-nil, treat the current buffer
193 as an absolute last resort only.
195 The function EXTRA-TEST-INCLUSIVE, if non-nil, is called in each buffer
196 that normally would not qualify. If it returns t, the buffer
197 in question is treated as usable.
199 The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called in each buffer
200 that would normally be considered usable. If it returns nil,
201 that buffer is rejected."
206 ;; Optionally reject some buffers.
209 t)
210 ;; Optionally accept some other buffers.
215 extra-test-inclusive
216 extra-test-exclusive)
217 "Return a `next-error' capable buffer.
219 If AVOID-CURRENT is non-nil, treat the current buffer
220 as an absolute last resort only.
222 The function EXTRA-TEST-INCLUSIVE, if non-nil, is called in each buffer
223 that normally would not qualify. If it returns t, the buffer
224 in question is treated as usable.
226 The function EXTRA-TEST-EXCLUSIVE, if non-nil, is called in each buffer
227 that would normally be considered usable. If it returns nil,
228 that buffer is rejected."
230 ;; 1. If one window on the selected frame displays such buffer, return it.
236 avoid-current
237 extra-test-inclusive extra-test-exclusive)
242 ;; 2. If next-error-last-buffer is an acceptable buffer, use that.
245 extra-test-inclusive extra-test-exclusive))
246 next-error-last-buffer)
247 ;; 3. If the current buffer is acceptable, choose it.
249 extra-test-inclusive extra-test-exclusive)
251 ;; 4. Look for any acceptable buffer.
256 extra-test-inclusive extra-test-exclusive)))
259 ;; 5. Use the current buffer as a last resort if it qualifies,
260 ;; even despite AVOID-CURRENT.
263 extra-test-inclusive extra-test-exclusive)
267 ;; 6. Give up.
271 "Visit next `next-error' message and corresponding source code.
273 If all the error messages parsed so far have been processed already,
274 the message buffer is checked for new ones.
276 A prefix ARG specifies how many error messages to move;
277 negative means move back to previous error messages.
279 and start at the first error.
281 The RESET argument specifies that we should restart from the beginning.
284 compilation, grep, or occur buffer. It can also operate on any
286 more generally, on any buffer in Compilation mode or with
287 Compilation Minor mode enabled, or any buffer in which
288 `next-error-function' is bound to an appropriate function.
289 To specify use of a particular buffer for error messages, type
291 in the current frame.
294 runs `next-error-hook' with `run-hooks', and stays with that buffer
295 until you use it in some other buffer which uses Compilation mode
296 or Compilation Minor mode.
298 See variables `compilation-parse-errors-function' and
299 \`compilation-error-regexp-alist' for customization ideas."
303 ;; we know here that next-error-function is a valid symbol we can funcall
309 "Visit the source code corresponding to the `next-error' message at point."
311 ;; we know here that next-error-function is a valid symbol we can funcall
320 "Visit previous `next-error' message and corresponding source code.
322 Prefix arg N says how many error messages to move backwards (or
323 forwards, if negative).
330 "Restart at the first error.
331 Visit corresponding source code.
332 With prefix arg N, visit the source code of the Nth error.
338 "Move point to the next error in the `next-error' buffer and highlight match.
339 Prefix arg N says how many error messages to move forwards (or
340 backwards, if negative).
342 select the source buffer."
349 "Move point to the previous error in the `next-error' buffer and highlight match.
350 Prefix arg N says how many error messages to move backwards (or
351 forwards, if negative).
353 select the source buffer."
357 ;;; Internal variable for `next-error-follow-mode-post-command-hook'.
361 "Minor mode for compilation, occur and diff modes.
362 When turned on, cursor motion in the compilation, grep, occur or diff
363 buffer causes automatic display of the corresponding source code
364 location."
371 ;;; Used as a `post-command-hook' by `next-error-follow-mode'
372 ;;; for the *Compilation* *grep* and *Occur* buffers.
382 \f
383 ;;;
386 "Major mode not specialized for anything in particular.
387 Other major modes are defined by comparison with this one."
393 ;; Making and deleting lines.
398 "Insert a newline, and move to left margin of the new line if it's blank.
399 If `use-hard-newlines' is non-nil, the newline is marked with the
400 text-property `hard'.
401 With ARG, insert that many newlines.
402 Call `auto-fill-function' if the current column number is greater
403 than the value of `fill-column' and ARG is nil."
406 ;; Inserting a newline at the end of a line produces better redisplay in
407 ;; try_window_id than inserting at the beginning of a line, and the textual
408 ;; result is the same. So, if we're at beginning of line, pretend to be at
409 ;; the end of the previous line.
412 ;; Make sure no functions want to be told about
413 ;; the range of the changes.
416 ;; Make sure there are no markers here.
419 ;; Make sure no text properties want to know
420 ;; where the change was.
425 ;; Make sure the newline before point isn't intangible.
427 ;; Make sure the newline before point isn't read-only.
429 ;; Make sure the newline before point isn't invisible.
431 ;; Make sure the newline before point has the same
432 ;; properties as the char before it (if any).
439 ;; Call self-insert so that auto-fill, abbrev expansion etc. happens.
440 ;; Set last-command-char to tell self-insert what to insert.
442 ;; Don't auto-fill if we have a numeric argument.
443 ;; Also not if flag is true (it would fill wrong line);
444 ;; there is no need to since we're at BOL.
448 ;; If we get an error in self-insert-command, put point at right place.
450 ;; Even if we did *not* get an error, keep that forward-char;
451 ;; all further processing should apply to the newline that the user
452 ;; thinks he inserted.
454 ;; Mark the newline(s) `hard'.
458 ;; If the newline leaves the previous line blank,
459 ;; and we have a left margin, delete that from the blank line.
467 ;; Indent the line after the newline, except in one case:
468 ;; when we added the newline at the beginning of a line
469 ;; which starts a page.
472 nil)
477 ;; If rear-nonsticky is not "t", add 'hard to rear-nonsticky list
483 "Insert a newline and leave point before it.
484 If there is a fill prefix and/or a `left-margin', insert them
485 on the new line if the line would have been blank.
486 With arg N, insert N newlines."
491 ;; Don't expand an abbrev before point.
505 "Split current line, moving portion beyond point vertically down.
506 If the current line starts with `fill-prefix', insert it on the new
507 line as well. With prefix ARG, don't insert `fill-prefix' on new line.
509 When called from Lisp code, ARG may be a prefix string to copy."
514 ;; What prefix should we check for (nil means don't).
518 ;; Does this line start with it?
529 "Join this line to previous and fix up whitespace at join.
530 If there is a fill prefix, delete it from the beginning of this line.
531 With argument, join this line to following line."
538 ;; If the second line started with the fill prefix,
539 ;; delete the prefix.
551 "On blank line, delete all surrounding blank lines, leaving just one.
552 On isolated blank line, delete that one.
553 On nonblank line, delete any immediately following blank lines."
559 ;; Set singleblank if there is just one blank line here.
566 ;; Delete preceding blank lines, and this one too if it's the only one.
575 ;; Delete following blank lines, unless the current line is blank
576 ;; and there are no following blank lines.
585 ;; Handle the special case where point is followed by newline and eob.
586 ;; Delete the line, leaving point at eob.
591 "Delete all the trailing whitespace across the current buffer.
592 All whitespace after the last non-whitespace character in a line is deleted.
594 A formfeed is not considered whitespace by this function."
601 ;; Don't delete formfeeds, even if they are considered whitespace.
608 "Insert a newline, then indent according to major mode.
609 Indentation is done using the value of `indent-line-function'.
610 In programming language modes, this is the same as TAB.
611 In some text modes, where TAB inserts a tab, this command indents to the
612 column specified by the function `current-left-margin'."
619 "Reindent current line, insert newline, then indent the new line.
620 Indentation of both lines is done according to the current major mode,
621 which means calling the current value of `indent-line-function'.
622 In programming language modes, this is the same as TAB.
623 In some text modes, where TAB inserts a tab, this indents to the
624 column specified by the function `current-left-margin'."
627 ;; Be careful to insert the newline before indenting the line.
628 ;; Otherwise, the indentation might be wrong.
637 "Read next input character and insert it.
638 This is useful for inserting control characters.
640 If the first character you type after this command is an octal digit,
641 you should type a sequence of octal digits which specify a character code.
642 Any nondigit terminates the sequence. If the terminator is a RET,
643 it is discarded; any other terminator is used itself as input.
644 The variable `read-quoted-char-radix' specifies the radix for this feature;
645 set it to 10 or 16 to use decimal or hex instead of octal.
647 In overwrite mode, this function inserts the character anyway, and
648 does not handle octal digits specially. This means that if you use
649 overwrite as your normal editing mode, you can use this function to
650 insert characters when necessary.
652 In binary overwrite mode, this function does overwrite, and octal
653 digits are interpreted as a character code. This is intended to be
654 useful for editing binary files."
661 ;; Assume character codes 0240 - 0377 stand for characters in some
662 ;; single-byte character set, and convert them to Emacs
663 ;; characters.
676 "Move forward ARG lines and position at first nonblank character."
682 "Move backward ARG lines and position at first nonblank character."
688 "Move point to the first non-whitespace character on this line."
692 ;; Move back over chars that have whitespace syntax but have the p flag.
696 "Fixup white space between objects around point.
697 Leave one space or none, according to the context."
704 nil
708 "Delete all spaces and tabs around point.
709 If BACKWARD-ONLY is non-nil, only delete spaces before point."
714 orig-pos
723 "Delete all spaces and tabs around point, leaving one space (or N spaces)."
737 \f
739 "Move point to the beginning of the buffer; leave mark at previous position.
741 With numeric arg N, put point N/10 of the way from the beginning.
743 If the buffer is narrowed, this command uses the beginning and size
744 of the accessible part of the buffer.
746 Don't use this command in Lisp programs!
747 \(goto-char (point-min)) is faster and avoids clobbering the mark."
756 ;; Avoid overflow for large buffer sizes!
764 "Move point to the end of the buffer; leave mark at previous position.
766 With numeric arg N, put point N/10 of the way from the end.
768 If the buffer is narrowed, this command uses the beginning and size
769 of the accessible part of the buffer.
771 Don't use this command in Lisp programs!
772 \(goto-char (point-max)) is faster and avoids clobbering the mark."
781 ;; Avoid overflow for large buffer sizes!
786 ;; If we went to a place in the middle of the buffer,
787 ;; adjust it to the beginning of a line.
790 ;; If the end of the buffer is not already on the screen,
791 ;; then scroll specially to put it near, but not at, the bottom.
796 "Put point at beginning and mark at end of buffer.
797 You probably should not use this function in Lisp programs;
798 it is usually a mistake for a Lisp function to use any subroutine
799 that uses or sets the mark."
804 \f
806 ;; Counting lines, one way or another.
809 "Goto line ARG, counting from line 1 at beginning of buffer.
810 Normally, move point in the current buffer.
812 displayed other buffer, and switch to it. When called from Lisp code,
813 the optional argument BUFFER specifies a buffer to switch to.
815 If there's a number in the buffer at point, it is the default for ARG."
819 ;; Look for a default, a number in the buffer at point.
828 ;; Decide if we're switching buffers.
836 ;; Read the argument, offering that number (if any) as default.
839 buffer-prompt
840 default)
841 nil nil t
842 'minibuffer-history
843 default)
844 buffer))))
845 ;; Switch to the desired buffer, one way or another.
850 ;; Move to the specified line number in that buffer.
859 "Print number of lines and characters in the region."
865 "Print the current buffer line number and narrowed line number of point."
878 "Return number of lines between START and END.
879 This is usually the number of newlines between them,
880 but can be one more if START is not equal to END
881 and the greater of them is not at the start of a line."
897 done)))
901 "Return (narrowed) buffer line number at position POS.
902 If POS is nil, use current buffer location."
912 "Print info on cursor position (on screen and within buffer).
913 Also describe the character after point, and give its character code
914 in octal, decimal and hex.
916 For a non-ASCII multibyte character, also give its encoding in the
917 buffer's selected coding system if the coding system encodes the
918 character safely. If the character is encoded into one byte, that
919 code is shown in hex. If the character is encoded into more than one
922 In addition, with prefix argument, show details about that character
923 in *Help* buffer. See also the command `describe-char'."
931 ;; Avoid overflow from multiplying by 100!
935 ""
941 pos total percent beg end col hscroll)
943 pos total col hscroll))
945 encoded encoding-msg display-prop under-display)
952 ;; Check if the character is displayed with some `display'
953 ;; text property. In that case, set under-display to the
954 ;; buffer substring covered by that property.
965 under-display)))
971 char char char under-display)
973 char char char under-display display-prop))
976 char char char
978 "..."
982 ;; We show the detailed information about CHAR.
989 encoding-msg pos total percent beg end col hscroll)
996 encoding-msg pos total percent col hscroll))))))
997 \f
1002 m)
1008 "Value for `print-level' while printing value in `eval-expression'.
1009 A value of nil means no limit."
1015 "Value for `print-length' while printing value in `eval-expression'.
1016 A value of nil means no limit."
1022 "If non-nil set `debug-on-error' to t in `eval-expression'.
1023 If nil, don't change the value of `debug-on-error'."
1029 "Format VALUE as a result of evaluated expression.
1030 Return a formatted string which is displayed in the echo area
1031 in addition to the value printed by prin1 in functions which
1032 display the result of expression evaluation."
1045 ;; We define this, rather than making `eval' interactive,
1046 ;; for the sake of completion of names like eval-region, eval-current-buffer.
1049 "Evaluate EVAL-EXPRESSION-ARG and print value in the echo area.
1050 Value is also consed on to front of the variable `values'.
1051 Optional argument EVAL-EXPRESSION-INSERT-VALUE, if non-nil, means
1052 insert the result into the current buffer instead of printing it in
1053 the echo area."
1056 nil read-expression-map t
1058 current-prefix-arg))
1063 ;; Bind debug-on-error to something unique so that we can
1064 ;; detect when evaled code changes it.
1068 ;; If evaled code has changed the value of debug-on-error,
1069 ;; propagate that change to the global binding.
1085 "Prompting with PROMPT, let user edit COMMAND and eval result.
1086 COMMAND is a Lisp expression. Let user edit that expression in
1087 the minibuffer, then read and evaluate the result."
1094 read-expression-map t
1096 ;; If command was added to command-history as a string,
1097 ;; get rid of that. We want only evaluable expressions there.
1101 ;; If command to be redone does not match front of history,
1102 ;; add it to the history.
1108 "Edit and re-evaluate last complex command, or ARGth from last.
1109 A complex command is one which used the minibuffer.
1110 The command is placed in the minibuffer as a Lisp form for editing.
1111 The result is executed, repeating the command as changed.
1112 If the command has been changed or is not the most recent previous command
1113 it is added to the front of the command history.
1114 You can use the minibuffer history commands \\<minibuffer-local-map>\\[next-history-element] and \\[previous-history-element]
1115 to get different commands to edit and resubmit."
1118 newcmd)
1130 ;; If command was added to command-history as a
1131 ;; string, get rid of that. We want only
1132 ;; evaluable expressions there.
1136 ;; If command to be redone does not match front of history,
1137 ;; add it to the history.
1144 \f
1146 "Default minibuffer history list.
1147 This is used for all minibuffer input
1150 "Control whether history list elements are expressions or strings.
1151 If the value of this variable equals current minibuffer depth,
1152 they are expressions; otherwise they are strings.
1153 \(That convention is designed to do the right thing for
1160 "Text that was in this minibuffer before any history commands.
1161 This is nil if there have not yet been any history commands
1170 "A point-motion hook for the minibuffer, that moves point out of the prompt."
1174 "*Minibuffer history variables for which matching should ignore case.
1175 If a history variable is a member of this list, then the
1177 commands ignore case when searching it, regardless of `case-fold-search'."
1182 "Find the previous history element that matches REGEXP.
1183 \(Previous history elements refer to earlier actions.)
1184 With prefix argument N, search for Nth previous match.
1185 If N is negative, find the next or Nth next match.
1186 Normally, history elements are matched case-insensitively if
1187 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1188 makes the search case-sensitive.
1189 See also `minibuffer-history-case-insensitive-variables'."
1193 nil
1194 minibuffer-local-map
1195 nil
1196 'minibuffer-history-search-history
1198 ;; Use the last regexp specified, by default, if input is empty.
1203 regexp)
1213 ;; On some systems, ignore case for file names.
1215 minibuffer-history-case-insensitive-variables)
1216 t
1217 ;; Respect the user's setting for case-fold-search:
1218 case-fold-search)
1219 nil))
1220 prevpos
1221 match-string
1222 match-offset
1229 "No later matching history item"
1250 next-matching-history-element))
1254 "Find the next history element that matches REGEXP.
1255 \(The next history element refers to a more recent action.)
1256 With prefix argument N, search for Nth next match.
1257 If N is negative, find the previous or Nth previous match.
1258 Normally, history elements are matched case-insensitively if
1259 `case-fold-search' is non-nil, but an uppercase letter in REGEXP
1260 makes the search case-sensitive."
1264 nil
1265 minibuffer-local-map
1266 nil
1267 'minibuffer-history-search-history
1269 ;; Use the last regexp specified, by default, if input is empty.
1274 regexp)
1281 "Insert the next element of the minibuffer history into the minibuffer."
1286 elt minibuffer-returned-to-present)
1298 previous-history-element))
1320 elt))
1324 "Inserts the previous element of the minibuffer history into the minibuffer."
1329 "Get next history element which completes the minibuffer before the point.
1330 The contents of the minibuffer after the point are deleted, and replaced
1331 by the new completion."
1337 n)
1338 ;; next-matching-history-element always puts us at (point-min).
1339 ;; Move to the position we were at before changing the buffer contents.
1340 ;; This is still sensical, because the text before point has not changed.
1344 "\
1345 Get previous history element which completes the minibuffer before the point.
1346 The contents of the minibuffer after the point are deleted, and replaced
1347 by the new completion."
1351 ;; For compatibility with the old subr of the same name.
1353 "Return the display width of the minibuffer prompt.
1354 Return 0 if current buffer is not a minibuffer."
1355 ;; Return the width of everything before the field at the end of
1356 ;; the buffer; this should be 0 for normal buffers.
1358 \f
1359 ;Put this on C-x u, so we can force that rather than C-_ into startup msg
1363 "Table mapping redo records to the corresponding undo one.
1364 A redo record for undo-in-region maps to t.
1374 "Within a run of consecutive undo commands, list remaining to be undone.
1378 "Undo some previous changes.
1379 Repeat this command to undo more changes.
1380 A numeric argument serves as a repeat count.
1382 In Transient Mark mode when the mark is active, only undo changes within
1384 as an argument limits undo to changes within the current region."
1386 ;; Make last-command indicate for the next command that this was an undo.
1387 ;; That way, another undo will undo more.
1388 ;; If we get to the end of the undo history and get an error,
1389 ;; another undo command will find the undo history empty
1390 ;; and will get another error. To begin undoing the undos,
1391 ;; you must type some other command.
1394 message)
1395 ;; If we get an error in undo-start,
1396 ;; the next command should not be a "consecutive undo".
1397 ;; So set `this-command' to something other than `undo'.
1402 ;; If something (a timer or filter?) changed the buffer
1403 ;; since the previous command, don't continue the undo seq.
1407 ;; If the last undo record made was made by undo
1408 ;; it shows nothing else happened in between.
1415 ;; get rid of initial undo boundary
1417 ;; If we got this far, the next command should be a consecutive undo.
1419 ;; Check to see whether we're hitting a redo record, and if
1420 ;; so, ask the user whether she wants to skip the redo/undo pair.
1427 ;; The equiv entry might point to another redo record if we have done
1428 ;; undo-redo-undo-redo-... so skip to the very last equiv.
1436 ;; Record the fact that the just-generated undo records come from an
1437 ;; undo operation--that is, they are redo records.
1438 ;; In the ordinary case (not within a region), map the redo
1439 ;; record to the following undos.
1440 ;; I don't know how to do that in the undo-in-region case.
1443 undo-equiv-table)
1444 ;; Don't specify a position in the undo record for the undo command.
1445 ;; Instead, undoing this should move point to where the change is.
1464 ;; Record what the current undo list says,
1465 ;; so the next command can tell if the buffer was modified in between.
1468 ;; Display a message announcing success.
1473 "Make BUFFER stop keeping undo information.
1474 No argument or nil as argument means do this for the current buffer."
1480 "Undo some previous changes.
1481 Repeat this command to undo more changes.
1482 A numeric argument serves as a repeat count.
1483 Contrary to `undo', this will not redo a previous undo."
1488 "Non-nil while performing an undo.
1492 "Undo back N undo-boundaries beyond what was already undone recently.
1493 Call `undo-start' to get ready to undo recent changes,
1494 then call `undo-more' one or more times to undo them."
1504 ;; Deep copy of a list
1506 "Make a copy of undo list LIST."
1512 elt))
1515 "Set `pending-undo-list' to the front of the undo list.
1516 The next call to `undo-more' will undo the most recently made change.
1517 If BEG and END are specified, then only undo elements
1518 that apply to text between BEG and END are used; other undo elements
1519 are ignored. If BEG and END are nil, all undo elements are used."
1525 buffer-undo-list)))
1530 "Return a list of undo elements for the region START to END.
1531 The elements come from `buffer-undo-list', but we keep only
1532 the elements inside this region, and discard those outside this region.
1533 If we find an element that crosses an edge of this region,
1534 we stop and ignore all further elements."
1537 undo-adjusted-markers
1538 some-rejected
1539 undo-elt undo-elt temp-undo-list delta)
1544 ;; This is a "was unmodified" element.
1545 ;; Keep it if we have kept everything thus far.
1552 ;; Don't put two nils together in the list
1566 ;; Loop down the earlier events adjusting their buffer
1567 ;; positions to reflect the fact that a change to the buffer
1568 ;; isn't being undone. We only need to process those element
1569 ;; types which undo-elt-in-region will return as being in
1570 ;; the region since only those types can ever get into the
1571 ;; output
1580 ;; (TEXT . POSITION)
1587 ;; (BEGIN . END)
1592 ;; (nil PROPERTY VALUE BEG . END)
1602 "Determine whether UNDO-ELT falls inside the region START ... END.
1603 If it crosses the edge, we return nil."
1608 t)
1610 nil)
1612 ;; (TEXT . POSITION)
1616 ;; This is a marker-adjustment element (MARKER . ADJUSTMENT).
1617 ;; See if MARKER is inside the region.
1628 ;; (nil PROPERTY VALUE BEG . END)
1633 ;; (BEGIN . END)
1638 "Test whether UNDO-ELT crosses one edge of that region START ... END.
1639 This assumes we have already decided that UNDO-ELT
1640 is not *inside* the region START...END."
1643 ;; (nil PROPERTY VALUE BEG . END)
1648 ;; (BEGIN . END)
1652 ;; Return the first affected buffer position and the delta for an undo element
1653 ;; delta is defined as the change in subsequent buffer positions if we *did*
1654 ;; the undo.
1658 ;; (TEXT . POSITION)
1661 ;; (BEGIN . END)
1668 "If non-nil ask about discarding undo info for the current command.
1669 Normally, Emacs discards the undo info for the current command if
1670 it exceeds `undo-outer-limit'. But if you set this option
1671 non-nil, it asks in the echo area whether to discard the info.
1672 If you answer no, there a slight risk that Emacs might crash, so
1673 only do it if you really want to undo the command.
1675 This option is mainly intended for debugging. You have to be
1676 careful if you use it for other purposes. Garbage collection is
1677 inhibited while the question is asked, meaning that Emacs might
1678 leak memory. So you should make sure that you do not wait
1679 excessively long before answering the question."
1685 "If non-nil, an extra level of size that's ok in an undo item.
1686 We don't ask the user about truncating the undo list until the
1687 current item gets bigger than this amount.
1692 ;; When the first undo batch in an undo list is longer than
1693 ;; undo-outer-limit, this function gets called to warn the user that
1694 ;; the undo info for the current command was discarded. Garbage
1695 ;; collection is inhibited around the call, so it had better not do a
1696 ;; lot of consing.
1702 ;; Don't ask the question again unless it gets even bigger.
1703 ;; This applies, in particular, if the user quits from the question.
1704 ;; Such a quit quits out of GC, but something else will call GC
1705 ;; again momentarily. It will call this function again,
1706 ;; but we don't want to ask the question again.
1713 t)
1714 nil))
1719 "The undo info was discarded because it exceeded \
1720 `undo-outer-limit'.
1722 This is normal if you executed a command that made a huge change
1723 to the buffer. In that case, to prevent similar problems in the
1724 future, set `undo-outer-limit' to a value that is large enough to
1725 cover the maximum size of normal changes you expect a single
1726 command to make, but not so large that it might exceed the
1727 maximum memory allotted to Emacs.
1729 If you did not execute any such command, the situation is
1730 probably due to a bug and you should report it.
1732 You can disable the popping up of this buffer by adding the entry
1736 t))
1737 \f
1745 "*Buffer name for `shell-command' and `shell-command-on-region' error output.
1746 This buffer is used when `shell-command' or `shell-command-on-region'
1747 is run interactively. A value of nil means that output to stderr and
1751 "Execute string COMMAND in inferior shell; display output, if any.
1752 With prefix argument, insert the COMMAND's output at point.
1754 If COMMAND ends in ampersand, execute it asynchronously.
1755 The output appears in the buffer `*Async Shell Command*'.
1756 That buffer is in shell mode.
1758 Otherwise, COMMAND is executed synchronously. The output appears in
1759 the buffer `*Shell Command Output*'. If the output is short enough to
1760 display in the echo area (which is determined by the variables
1761 `resize-mini-windows' and `max-mini-window-height'), it is shown
1762 there, but it is nonetheless available in buffer `*Shell Command
1763 Output*' even though that buffer is not automatically displayed.
1765 To specify a coding system for converting non-ASCII characters
1767 before this command.
1769 Noninteractive callers can specify coding systems by binding
1770 `coding-system-for-read' and `coding-system-for-write'.
1772 The optional second argument OUTPUT-BUFFER, if non-nil,
1773 says to put the output in some other buffer.
1774 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
1775 If OUTPUT-BUFFER is not a buffer and not nil,
1776 insert output in current buffer. (This cannot be done asynchronously.)
1777 In either case, the output is inserted after point (leaving mark after it).
1779 If the command terminates without error, but generates output,
1781 the output can be displayed in the echo area or in its buffer.
1782 If the output is short enough to display in the echo area
1783 \(determined by the variable `max-mini-window-height' if
1784 `resize-mini-windows' is non-nil), it is shown there. Otherwise,
1785 the buffer containing the output is displayed.
1789 of the output.
1791 If there is no output, or if output is inserted in the current buffer,
1792 then `*Shell Command Output*' is deleted.
1794 If the optional third argument ERROR-BUFFER is non-nil, it is a buffer
1795 or buffer name to which to direct the command's standard error output.
1796 If it is nil, error output is mingled with regular output.
1797 In an interactive call, the variable `shell-command-default-error-buffer'
1798 specifies the value of ERROR-BUFFER."
1802 current-prefix-arg
1803 shell-command-default-error-buffer))
1804 ;; Look for a handler in case default-directory is a remote file name.
1812 ;; Output goes in current buffer.
1818 temporary-file-directory)))
1819 nil)))
1822 ;; We do not use -f for csh; we will not support broken use of
1823 ;; .cshrcs. Even the BSD csh manual says to use
1824 ;; "if ($?prompt) exit" before things which are not useful
1825 ;; non-interactively. Besides, if someone wants their other
1826 ;; aliases for shell commands then they can still have them.
1830 t)
1831 nil shell-command-switch command)
1838 ;; Do no formatting while reading error file,
1839 ;; because that can run a shell command, and we
1840 ;; don't want that to cause an infinite recursion.
1842 ;; Put point after the inserted errors.
1846 ;; This is like exchange-point-and-mark, but doesn't
1847 ;; activate the mark. It is cleaner to avoid activation,
1848 ;; even though the command loop would deactivate the mark
1849 ;; because we inserted text.
1853 ;; Output goes in a separate buffer.
1854 ;; Preserve the match data in case called from a program.
1857 ;; Command ending with ampersand means asynchronous.
1861 proc)
1862 ;; Remove the ampersand.
1864 ;; If will kill a process, query first.
1876 shell-command-switch command))
1880 ))
1882 output-buffer nil error-buffer)))))))
1886 "Display MESSAGE in the echo area if possible, otherwise in a pop-up buffer.
1887 MESSAGE may be either a string or a buffer.
1889 A buffer is displayed using `display-buffer' if MESSAGE is too long for
1890 the maximum height of the echo area, as defined by `max-mini-window-height'
1891 if `resize-mini-windows' is non-nil.
1893 Returns either the string shown in the echo area, or when a pop-up
1894 buffer is used, the window used to display it.
1896 If MESSAGE is a string, then the optional argument BUFFER-NAME is the
1897 name of the buffer used to display it in the case where a pop-up buffer
1898 is used, defaulting to `*Message*'. In the case where MESSAGE is a
1899 string and it is displayed in the echo area, it is not specified whether
1900 the contents are inserted into the buffer anyway.
1902 Optional arguments NOT-THIS-WINDOW and FRAME are as for `display-buffer',
1903 and only used if a buffer is displayed."
1905 ;; Trivial case where we can use the echo area
1909 ;; Trivial case where we can just remove single trailing newline
1912 ;; General case
1915 message
1924 0
1928 (<= lines
1932 max-mini-window-height))
1934 max-mini-window-height)
1938 ;; Don't use the echo area if the output buffer is
1939 ;; already dispayed in the selected frame.
1941 ;; Echo area
1947 ;; Buffer
1950 not-this-window frame))))))))
1953 ;; We have a sentinel to prevent insertion of a termination message
1954 ;; in the buffer itself.
1962 &optional output-buffer replace
1963 error-buffer display-error-buffer)
1964 "Execute string COMMAND in inferior shell with region as input.
1965 Normally display output (if any) in temp buffer `*Shell Command Output*';
1966 Prefix arg means replace the region with it. Return the exit code of
1967 COMMAND.
1969 To specify a coding system for converting non-ASCII characters
1971 before this command. By default, the input (from the current buffer)
1972 is encoded in the same coding system that will be used to save the file,
1973 `buffer-file-coding-system'. If the output is going to replace the region,
1974 then it is decoded from that same coding system.
1976 The noninteractive arguments are START, END, COMMAND,
1977 OUTPUT-BUFFER, REPLACE, ERROR-BUFFER, and DISPLAY-ERROR-BUFFER.
1978 Noninteractive callers can specify coding systems by binding
1979 `coding-system-for-read' and `coding-system-for-write'.
1981 If the command generates output, the output may be displayed
1982 in the echo area or in a buffer.
1983 If the output is short enough to display in the echo area
1984 \(determined by the variable `max-mini-window-height' if
1985 `resize-mini-windows' is non-nil), it is shown there. Otherwise
1986 it is displayed in the buffer `*Shell Command Output*'. The output
1987 is available in that buffer in both cases.
1989 If there is output and an error, a message about the error
1990 appears at the end of the output.
1992 If there is no output, or if output is inserted in the current buffer,
1993 then `*Shell Command Output*' is deleted.
1995 If the optional fourth argument OUTPUT-BUFFER is non-nil,
1996 that says to put the output in some other buffer.
1997 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
1998 If OUTPUT-BUFFER is not a buffer and not nil,
1999 insert output in the current buffer.
2000 In either case, the output is inserted after point (leaving mark after it).
2002 If REPLACE, the optional fifth argument, is non-nil, that means insert
2003 the output in place of text from START to END, putting point and mark
2004 around it.
2006 If optional sixth argument ERROR-BUFFER is non-nil, it is a buffer
2007 or buffer name to which to direct the command's standard error output.
2008 If it is nil, error output is mingled with regular output.
2009 If DISPLAY-ERROR-BUFFER is non-nil, display the error buffer if there
2010 were any errors. (This is always t, interactively.)
2011 In an interactive call, the variable `shell-command-default-error-buffer'
2012 specifies the value of ERROR-BUFFER."
2016 ;; Do this before calling region-beginning
2017 ;; and region-end, in case subprocess output
2018 ;; relocates them while we are in the minibuffer.
2020 nil nil nil
2022 ;; call-interactively recognizes region-beginning and
2023 ;; region-end specially, leaving them in the history.
2025 string
2026 current-prefix-arg
2027 current-prefix-arg
2028 shell-command-default-error-buffer
2029 t)))
2035 temporary-file-directory)))
2036 nil))
2037 exit-status)
2041 ;; Replace specified region with output from command.
2043 ;; Don't muck with mark unless REPLACE says we should.
2050 t)
2051 nil shell-command-switch command))
2052 ;; It is rude to delete a buffer which the command is not using.
2053 ;; (let ((shell-buffer (get-buffer "*Shell Command Output*")))
2054 ;; (and shell-buffer (not (eq shell-buffer (current-buffer)))
2055 ;; (kill-buffer shell-buffer)))
2056 ;; Don't muck with mark unless REPLACE says we should.
2058 ;; No prefix argument: put the output in a temp buffer,
2059 ;; replacing its entire contents.
2064 ;; If the input is the same buffer as the output,
2065 ;; delete everything but the specified region,
2066 ;; then replace that region with the output.
2072 shell-file-name t
2075 t)
2076 nil shell-command-switch
2077 command)))
2078 ;; Clear the output buffer, then run the command with
2079 ;; output there.
2091 buffer)
2092 nil shell-command-switch command)))
2093 ;; Report the output.
2103 ;; There's some output, display it
2105 ;; No output; error?
2109 "some error output"
2115 output))
2118 exit-status))
2121 exit-status output))))
2122 ;; Don't kill: there might be useful info in the undo-log.
2123 ;; (kill-buffer buffer)
2124 ))))
2132 ;; Do no formatting while reading error file,
2133 ;; because that can run a shell command, and we
2134 ;; don't want that to cause an infinite recursion.
2136 ;; Put point after the inserted errors.
2141 exit-status))
2144 "Execute shell command COMMAND and return its output as a string."
2147 standard-output
2151 "Process files synchronously in a separate process.
2152 Similar to `call-process', but may invoke a file handler based on
2153 `default-directory'. The current working directory of the
2154 subprocess is `default-directory'.
2156 File names in INFILE and BUFFER are handled normally, but file
2157 names in ARGS should be relative to `default-directory', as they
2158 are passed to the process verbatim. \(This is a difference to
2159 `call-process' which does not support file handlers for INFILE
2160 and BUFFER.\)
2162 Some file handlers might not support all variants, for example
2163 they might behave as if DISPLAY was nil, regardless of the actual
2164 value passed."
2166 lc stderr-file)
2176 display args)
2182 \f
2186 (define-key map (vector meta-prefix-char t) 'universal-argument-other-key)
2187 (define-key map [switch-frame] nil)
2188 (define-key map [?\C-u] 'universal-argument-more)
2189 (define-key map [?-] 'universal-argument-minus)
2190 (define-key map [?0] 'digit-argument)
2191 (define-key map [?1] 'digit-argument)
2192 (define-key map [?2] 'digit-argument)
2193 (define-key map [?3] 'digit-argument)
2194 (define-key map [?4] 'digit-argument)
2195 (define-key map [?5] 'digit-argument)
2196 (define-key map [?6] 'digit-argument)
2197 (define-key map [?7] 'digit-argument)
2198 (define-key map [?8] 'digit-argument)
2199 (define-key map [?9] 'digit-argument)
2200 (define-key map [kp-0] 'digit-argument)
2201 (define-key map [kp-1] 'digit-argument)
2202 (define-key map [kp-2] 'digit-argument)
2203 (define-key map [kp-3] 'digit-argument)
2204 (define-key map [kp-4] 'digit-argument)
2205 (define-key map [kp-5] 'digit-argument)
2206 (define-key map [kp-6] 'digit-argument)
2207 (define-key map [kp-7] 'digit-argument)
2208 (define-key map [kp-8] 'digit-argument)
2209 (define-key map [kp-9] 'digit-argument)
2210 (define-key map [kp-subtract] 'universal-argument-minus)
2211 map)
2214 (defvar universal-argument-num-events nil
2215 "Number of argument-specifying events read by `universal-argument'.
2216 `universal-argument-other-key' uses this to discard those events
2217 from (this-command-keys), and reread only the final command.")
2219 (defvar overriding-map-is-bound nil
2220 "Non-nil when `overriding-terminal-local-map' is `universal-argument-map'.")
2222 (defvar saved-overriding-map nil
2223 "The saved value of `overriding-terminal-local-map'.
2227 (defun ensure-overriding-map-is-bound ()
2228 "Check `overriding-terminal-local-map' is `universal-argument-map'."
2229 (unless overriding-map-is-bound
2230 (setq saved-overriding-map overriding-terminal-local-map)
2231 (setq overriding-terminal-local-map universal-argument-map)
2232 (setq overriding-map-is-bound t)))
2234 (defun restore-overriding-map ()
2235 "Restore `overriding-terminal-local-map' to its saved value."
2236 (setq overriding-terminal-local-map saved-overriding-map)
2237 (setq overriding-map-is-bound nil))
2239 (defun universal-argument ()
2240 "Begin a numeric argument for the following command.
2245 multiplies the argument by 4 each time.
2247 which is different in effect from any particular numeric argument.
2249 (interactive)
2250 (setq prefix-arg (list 4))
2251 (setq universal-argument-num-events (length (this-command-keys)))
2252 (ensure-overriding-map-is-bound))
2254 ;; A subsequent C-u means to multiply the factor by 4 if we've typed
2255 ;; nothing but C-u's; otherwise it means to terminate the prefix arg.
2256 (defun universal-argument-more (arg)
2257 (interactive "P")
2258 (if (consp arg)
2259 (setq prefix-arg (list (* 4 (car arg))))
2260 (if (eq arg '-)
2261 (setq prefix-arg (list -4))
2262 (setq prefix-arg arg)
2263 (restore-overriding-map)))
2264 (setq universal-argument-num-events (length (this-command-keys))))
2266 (defun negative-argument (arg)
2267 "Begin a negative numeric argument for the next command.
2269 (interactive "P")
2270 (cond ((integerp arg)
2271 (setq prefix-arg (- arg)))
2272 ((eq arg '-)
2273 (setq prefix-arg nil))
2274 (t
2275 (setq prefix-arg '-)))
2276 (setq universal-argument-num-events (length (this-command-keys)))
2277 (ensure-overriding-map-is-bound))
2279 (defun digit-argument (arg)
2280 "Part of the numeric argument for the next command.
2282 (interactive "P")
2283 (let* ((char (if (integerp last-command-char)
2284 last-command-char
2285 (get last-command-char 'ascii-character)))
2287 (cond ((integerp arg)
2288 (setq prefix-arg (+ (* arg 10)
2289 (if (< arg 0) (- digit) digit))))
2290 ((eq arg '-)
2291 ;; Treat -0 as just -, so that -01 will work.
2292 (setq prefix-arg (if (zerop digit) '- (- digit))))
2293 (t
2294 (setq prefix-arg digit))))
2295 (setq universal-argument-num-events (length (this-command-keys)))
2296 (ensure-overriding-map-is-bound))
2298 ;; For backward compatibility, minus with no modifiers is an ordinary
2299 ;; command if digits have already been entered.
2300 (defun universal-argument-minus (arg)
2301 (interactive "P")
2302 (if (integerp arg)
2303 (universal-argument-other-key arg)
2304 (negative-argument arg)))
2306 ;; Anything else terminates the argument and is left in the queue to be
2307 ;; executed as a command.
2308 (defun universal-argument-other-key (arg)
2309 (interactive "P")
2310 (setq prefix-arg arg)
2311 (let* ((key (this-command-keys))
2312 (keylist (listify-key-sequence key)))
2313 (setq unread-command-events
2314 (append (nthcdr universal-argument-num-events keylist)
2315 unread-command-events)))
2316 (reset-this-command-lengths)
2317 (restore-overriding-map))
2318 \f
2319 (defvar buffer-substring-filters nil
2320 "List of filter functions for `filter-buffer-substring'.
2321 Each function must accept a single argument, a string, and return
2322 a string. The buffer substring is passed to the first function
2323 in the list, and the return value of each function is passed to
2324 the next. The return value of the last function is used as the
2325 return value of `filter-buffer-substring'.
2327 If this variable is nil, no filtering is performed.")
2329 (defun filter-buffer-substring (beg end &optional delete)
2330 "Return the buffer substring between BEG and END, after filtering.
2331 The buffer substring is passed through each of the filter
2332 functions in `buffer-substring-filters', and the value from the
2333 last filter function is returned. If `buffer-substring-filters'
2334 is nil, the buffer substring is returned unaltered.
2336 If DELETE is non-nil, the text between BEG and END is deleted
2337 from the buffer.
2339 Point is temporarily set to BEG before calling
2340 `buffer-substring-filters', in case the functions need to know
2341 where the text came from.
2343 This function should be used instead of `buffer-substring' or
2344 `delete-and-extract-region' when you want to allow filtering to
2345 take place. For example, major or minor modes can use
2346 `buffer-substring-filters' to extract characters that are special
2347 to a buffer, and should not be copied into other buffers."
2348 (save-excursion
2349 (goto-char beg)
2350 (let ((string (if delete (delete-and-extract-region beg end)
2351 (buffer-substring beg end))))
2352 (dolist (filter buffer-substring-filters string)
2353 (setq string (funcall filter string))))))
2355 ;;;; Window system cut and paste hooks.
2357 (defvar interprogram-cut-function nil
2358 "Function to call to make a killed region available to other programs.
2360 Most window systems provide some sort of facility for cutting and
2361 pasting text between the windows of different programs.
2362 This variable holds a function that Emacs calls whenever text
2363 is put in the kill ring, to make the new kill available to other
2364 programs.
2366 The function takes one or two arguments.
2367 The first argument, TEXT, is a string containing
2368 the text which should be made available.
2369 The second, optional, argument PUSH, has the same meaning as the
2370 similar argument to `x-set-cut-buffer', which see.")
2372 (defvar interprogram-paste-function nil
2373 "Function to call to get text cut from other programs.
2375 Most window systems provide some sort of facility for cutting and
2376 pasting text between the windows of different programs.
2377 This variable holds a function that Emacs calls to obtain
2378 text that other programs have provided for pasting.
2380 The function should be called with no arguments. If the function
2381 returns nil, then no other program has provided such text, and the top
2382 of the Emacs kill ring should be used. If the function returns a
2383 string, then the caller of the function \(usually `current-kill')
2384 should put this string in the kill ring as the latest kill.
2386 Note that the function should return a string only if a program other
2387 than Emacs has provided a string for pasting; if Emacs provided the
2388 most recent string, the function should return nil. If it is
2389 difficult to tell whether Emacs or some other program provided the
2390 current string, it is probably good enough to return nil if the string
2391 is equal (according to `string=') to the last text Emacs provided.")
2392 \f
2395 ;;;; The kill ring data structure.
2397 (defvar kill-ring nil
2398 "List of killed text sequences.
2399 Since the kill ring is supposed to interact nicely with cut-and-paste
2400 facilities offered by window systems, use of this variable should
2401 interact nicely with `interprogram-cut-function' and
2402 `interprogram-paste-function'. The functions `kill-new',
2403 `kill-append', and `current-kill' are supposed to implement this
2404 interaction; you may want to use them instead of manipulating the kill
2405 ring directly.")
2407 (defcustom kill-ring-max 60
2408 "*Maximum length of kill ring before oldest elements are thrown away."
2409 :type 'integer
2410 :group 'killing)
2412 (defvar kill-ring-yank-pointer nil
2413 "The tail of the kill ring whose car is the last thing yanked.")
2415 (defun kill-new (string &optional replace yank-handler)
2416 "Make STRING the latest kill in the kill ring.
2417 Set `kill-ring-yank-pointer' to point to it.
2418 If `interprogram-cut-function' is non-nil, apply it to STRING.
2419 Optional second argument REPLACE non-nil means that STRING will replace
2420 the front of the kill ring, rather than being added to the list.
2422 Optional third arguments YANK-HANDLER controls how the STRING is later
2423 inserted into a buffer; see `insert-for-yank' for details.
2424 When a yank handler is specified, STRING must be non-empty (the yank
2425 handler, if non-nil, is stored as a `yank-handler' text property on STRING).
2427 When the yank handler has a non-nil PARAM element, the original STRING
2428 argument is not used by `insert-for-yank'. However, since Lisp code
2429 may access and use elements from the kill ring directly, the STRING
2431 (if (> (length string) 0)
2432 (if yank-handler
2433 (put-text-property 0 (length string)
2434 'yank-handler yank-handler string))
2435 (if yank-handler
2436 (signal 'args-out-of-range
2437 (list string "yank-handler specified for empty string"))))
2438 (if (fboundp 'menu-bar-update-yank-menu)
2439 (menu-bar-update-yank-menu string (and replace (car kill-ring))))
2440 (if (and replace kill-ring)
2441 (setcar kill-ring string)
2442 (push string kill-ring)
2443 (if (> (length kill-ring) kill-ring-max)
2444 (setcdr (nthcdr (1- kill-ring-max) kill-ring) nil)))
2445 (setq kill-ring-yank-pointer kill-ring)
2446 (if interprogram-cut-function
2447 (funcall interprogram-cut-function string (not replace))))
2449 (defun kill-append (string before-p &optional yank-handler)
2450 "Append STRING to the end of the latest kill in the kill ring.
2451 If BEFORE-P is non-nil, prepend STRING to the kill.
2452 Optional third argument YANK-HANDLER, if non-nil, specifies the
2453 yank-handler text property to be set on the combined kill ring
2454 string. If the specified yank-handler arg differs from the
2455 yank-handler property of the latest kill string, this function
2456 adds the combined string to the kill ring as a new element,
2457 instead of replacing the last kill with it.
2458 If `interprogram-cut-function' is set, pass the resulting kill to it."
2459 (let* ((cur (car kill-ring)))
2460 (kill-new (if before-p (concat string cur) (concat cur string))
2461 (or (= (length cur) 0)
2462 (equal yank-handler (get-text-property 0 'yank-handler cur)))
2463 yank-handler)))
2465 (defun current-kill (n &optional do-not-move)
2466 "Rotate the yanking point by N places, and then return that kill.
2467 If N is zero, `interprogram-paste-function' is set, and calling it
2468 returns a string, then that string is added to the front of the
2469 kill ring and returned as the latest kill.
2470 If optional arg DO-NOT-MOVE is non-nil, then don't actually move the
2471 yanking point; just return the Nth kill forward."
2472 (let ((interprogram-paste (and (= n 0)
2473 interprogram-paste-function
2474 (funcall interprogram-paste-function))))
2475 (if interprogram-paste
2476 (progn
2477 ;; Disable the interprogram cut function when we add the new
2478 ;; text to the kill ring, so Emacs doesn't try to own the
2479 ;; selection, with identical text.
2480 (let ((interprogram-cut-function nil))
2481 (kill-new interprogram-paste))
2482 interprogram-paste)
2483 (or kill-ring (error "Kill ring is empty"))
2484 (let ((ARGth-kill-element
2485 (nthcdr (mod (- n (length kill-ring-yank-pointer))
2486 (length kill-ring))
2487 kill-ring)))
2488 (or do-not-move
2489 (setq kill-ring-yank-pointer ARGth-kill-element))
2490 (car ARGth-kill-element)))))
2494 ;;;; Commands for manipulating the kill ring.
2496 (defcustom kill-read-only-ok nil
2497 "*Non-nil means don't signal an error for killing read-only text."
2498 :type 'boolean
2499 :group 'killing)
2501 (put 'text-read-only 'error-conditions
2502 '(text-read-only buffer-read-only error))
2503 (put 'text-read-only 'error-message "Text is read-only")
2505 (defun kill-region (beg end &optional yank-handler)
2506 "Kill between point and mark.
2507 The text is deleted but saved in the kill ring.
2511 If you want to append the killed region to the last killed text,
2514 If the buffer is read-only, Emacs will beep and refrain from deleting
2515 the text, but put the text in the kill ring anyway. This means that
2516 you can use the killing commands to copy text from a read-only buffer.
2518 This is the primitive for programs to kill text (as opposed to deleting it).
2519 Supply two arguments, character positions indicating the stretch of text
2520 to be killed.
2522 If the previous command was also a kill command,
2523 the text killed this time appends to the text killed last time
2524 to make one entry in the kill ring.
2526 In Lisp code, optional third arg YANK-HANDLER, if non-nil,
2527 specifies the yank-handler text property to be set on the killed
2528 text. See `insert-for-yank'."
2529 (interactive "r")
2530 (condition-case nil
2531 (let ((string (filter-buffer-substring beg end t)))
2532 (when string ;STRING is nil if BEG = END
2533 ;; Add that string to the kill ring, one way or another.
2534 (if (eq last-command 'kill-region)
2535 (kill-append string (< end beg) yank-handler)
2536 (kill-new string nil yank-handler)))
2537 (when (or string (eq last-command 'kill-region))
2538 (setq this-command 'kill-region))
2539 nil)
2540 ((buffer-read-only text-read-only)
2541 ;; The code above failed because the buffer, or some of the characters
2542 ;; in the region, are read-only.
2543 ;; We should beep, in case the user just isn't aware of this.
2544 ;; However, there's no harm in putting
2545 ;; the region's text in the kill ring, anyway.
2546 (copy-region-as-kill beg end)
2547 ;; Set this-command now, so it will be set even if we get an error.
2548 (setq this-command 'kill-region)
2549 ;; This should barf, if appropriate, and give us the correct error.
2550 (if kill-read-only-ok
2551 (progn (message "Read only text copied to kill ring") nil)
2552 ;; Signal an error if the buffer is read-only.
2553 (barf-if-buffer-read-only)
2554 ;; If the buffer isn't read-only, the text is.
2555 (signal 'text-read-only (list (current-buffer)))))))
2557 ;; copy-region-as-kill no longer sets this-command, because it's confusing
2558 ;; to get two copies of the text when the user accidentally types M-w and
2559 ;; then corrects it with the intended C-w.
2560 (defun copy-region-as-kill (beg end)
2561 "Save the region as if killed, but don't kill it.
2562 In Transient Mark mode, deactivate the mark.
2563 If `interprogram-cut-function' is non-nil, also save the text for a window
2564 system cut and paste."
2565 (interactive "r")
2566 (if (eq last-command 'kill-region)
2567 (kill-append (filter-buffer-substring beg end) (< end beg))
2568 (kill-new (filter-buffer-substring beg end)))
2569 (if transient-mark-mode
2570 (setq deactivate-mark t))
2571 nil)
2573 (defun kill-ring-save (beg end)
2574 "Save the region as if killed, but don't kill it.
2575 In Transient Mark mode, deactivate the mark.
2576 If `interprogram-cut-function' is non-nil, also save the text for a window
2577 system cut and paste.
2579 If you want to append the killed line to the last killed text,
2582 This command is similar to `copy-region-as-kill', except that it gives
2583 visual feedback indicating the extent of the region being copied."
2584 (interactive "r")
2585 (copy-region-as-kill beg end)
2586 ;; This use of interactive-p is correct
2587 ;; because the code it controls just gives the user visual feedback.
2588 (if (interactive-p)
2589 (let ((other-end (if (= (point) beg) end beg))
2590 (opoint (point))
2591 ;; Inhibit quitting so we can make a quit here
2592 ;; look like a C-g typed as a command.
2593 (inhibit-quit t))
2594 (if (pos-visible-in-window-p other-end (selected-window))
2595 (unless (and transient-mark-mode
2596 (face-background 'region))
2597 ;; Swap point and mark.
2598 (set-marker (mark-marker) (point) (current-buffer))
2599 (goto-char other-end)
2600 (sit-for blink-matching-delay)
2601 ;; Swap back.
2602 (set-marker (mark-marker) other-end (current-buffer))
2603 (goto-char opoint)
2604 ;; If user quit, deactivate the mark
2605 ;; as C-g would as a command.
2606 (and quit-flag mark-active
2607 (deactivate-mark)))
2608 (let* ((killed-text (current-kill 0))
2609 (message-len (min (length killed-text) 40)))
2610 (if (= (point) beg)
2611 ;; Don't say "killed"; that is misleading.
2613 (substring killed-text (- message-len)))
2615 (substring killed-text 0 message-len))))))))
2617 (defun append-next-kill (&optional interactive)
2618 "Cause following command, if it kills, to append to previous kill.
2619 The argument is used for internal purposes; do not supply one."
2620 (interactive "p")
2621 ;; We don't use (interactive-p), since that breaks kbd macros.
2622 (if interactive
2623 (progn
2624 (setq this-command 'kill-region)
2625 (message "If the next command is a kill, it will append"))
2626 (setq last-command 'kill-region)))
2627 \f
2628 ;; Yanking.
2630 ;; This is actually used in subr.el but defcustom does not work there.
2631 (defcustom yank-excluded-properties
2632 '(read-only invisible intangible field mouse-face help-echo local-map keymap
2633 yank-handler follow-link)
2634 "*Text properties to discard when yanking.
2635 The value should be a list of text properties to discard or t,
2636 which means to discard all text properties."
2637 :type '(choice (const :tag "All" t) (repeat symbol))
2638 :group 'killing
2639 :version "22.1")
2641 (defvar yank-window-start nil)
2642 (defvar yank-undo-function nil
2643 "If non-nil, function used by `yank-pop' to delete last stretch of yanked text.
2644 Function is called with two parameters, START and END corresponding to
2645 the value of the mark and point; it is guaranteed that START <= END.
2646 Normally set from the UNDO element of a yank-handler; see `insert-for-yank'.")
2648 (defun yank-pop (&optional arg)
2649 "Replace just-yanked stretch of killed text with a different stretch.
2650 This command is allowed only immediately after a `yank' or a `yank-pop'.
2651 At such a time, the region contains a stretch of reinserted
2652 previously-killed text. `yank-pop' deletes that text and inserts in its
2653 place a different stretch of killed text.
2655 With no argument, the previous kill is inserted.
2656 With argument N, insert the Nth previous kill.
2657 If N is negative, this is a more recent kill.
2659 The sequence of kills wraps around, so that after the oldest one
2660 comes the newest one.
2662 When this command inserts killed text into the buffer, it honors
2663 `yank-excluded-properties' and `yank-handler' as described in the
2664 doc string for `insert-for-yank-1', which see."
2665 (interactive "*p")
2666 (if (not (eq last-command 'yank))
2667 (error "Previous command was not a yank"))
2668 (setq this-command 'yank)
2669 (unless arg (setq arg 1))
2670 (let ((inhibit-read-only t)
2671 (before (< (point) (mark t))))
2672 (if before
2673 (funcall (or yank-undo-function 'delete-region) (point) (mark t))
2674 (funcall (or yank-undo-function 'delete-region) (mark t) (point)))
2675 (setq yank-undo-function nil)
2676 (set-marker (mark-marker) (point) (current-buffer))
2677 (insert-for-yank (current-kill arg))
2678 ;; Set the window start back where it was in the yank command,
2679 ;; if possible.
2680 (set-window-start (selected-window) yank-window-start t)
2681 (if before
2682 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
2683 ;; It is cleaner to avoid activation, even though the command
2684 ;; loop would deactivate the mark because we inserted text.
2685 (goto-char (prog1 (mark t)
2686 (set-marker (mark-marker) (point) (current-buffer))))))
2687 nil)
2689 (defun yank (&optional arg)
2690 "Reinsert the last stretch of killed text.
2691 More precisely, reinsert the stretch of killed text most recently
2692 killed OR yanked. Put point at end, and set mark at beginning.
2693 With just \\[universal-argument] as argument, same but put point at beginning (and mark at end).
2694 With argument N, reinsert the Nth most recently killed stretch of killed
2695 text.
2697 When this command inserts killed text into the buffer, it honors
2698 `yank-excluded-properties' and `yank-handler' as described in the
2699 doc string for `insert-for-yank-1', which see.
2702 (interactive "*P")
2703 (setq yank-window-start (window-start))
2704 ;; If we don't get all the way thru, make last-command indicate that
2705 ;; for the following command.
2706 (setq this-command t)
2707 (push-mark (point))
2708 (insert-for-yank (current-kill (cond
2709 ((listp arg) 0)
2710 ((eq arg '-) -2)
2711 (t (1- arg)))))
2712 (if (consp arg)
2713 ;; This is like exchange-point-and-mark, but doesn't activate the mark.
2714 ;; It is cleaner to avoid activation, even though the command
2715 ;; loop would deactivate the mark because we inserted text.
2716 (goto-char (prog1 (mark t)
2717 (set-marker (mark-marker) (point) (current-buffer)))))
2718 ;; If we do get all the way thru, make this-command indicate that.
2719 (if (eq this-command t)
2720 (setq this-command 'yank))
2721 nil)
2723 (defun rotate-yank-pointer (arg)
2724 "Rotate the yanking point in the kill ring.
2725 With argument, rotate that many kills forward (or backward, if negative)."
2726 (interactive "p")
2727 (current-kill arg))
2728 \f
2729 ;; Some kill commands.
2731 ;; Internal subroutine of delete-char
2732 (defun kill-forward-chars (arg)
2733 (if (listp arg) (setq arg (car arg)))
2734 (if (eq arg '-) (setq arg -1))
2735 (kill-region (point) (forward-point arg)))
2737 ;; Internal subroutine of backward-delete-char
2738 (defun kill-backward-chars (arg)
2739 (if (listp arg) (setq arg (car arg)))
2740 (if (eq arg '-) (setq arg -1))
2741 (kill-region (point) (forward-point (- arg))))
2743 (defcustom backward-delete-char-untabify-method 'untabify
2744 "*The method for untabifying when deleting backward.
2745 Can be `untabify' -- turn a tab to many spaces, then delete one space;
2746 `hungry' -- delete all whitespace, both tabs and spaces;
2747 `all' -- delete all whitespace, including tabs, spaces and newlines;
2748 nil -- just delete one character."
2749 :type '(choice (const untabify) (const hungry) (const all) (const nil))
2750 :version "20.3"
2751 :group 'killing)
2753 (defun backward-delete-char-untabify (arg &optional killp)
2754 "Delete characters backward, changing tabs into spaces.
2755 The exact behavior depends on `backward-delete-char-untabify-method'.
2756 Delete ARG chars, and kill (save in kill ring) if KILLP is non-nil.
2757 Interactively, ARG is the prefix arg (default 1)
2758 and KILLP is t if a prefix arg was specified."
2760 (when (eq backward-delete-char-untabify-method 'untabify)
2761 (let ((count arg))
2762 (save-excursion
2763 (while (and (> count 0) (not (bobp)))
2765 (let ((col (current-column)))
2766 (forward-char -1)
2767 (setq col (- col (current-column)))
2768 (insert-char ?\s col)
2769 (delete-char 1)))
2770 (forward-char -1)
2771 (setq count (1- count))))))
2772 (delete-backward-char
2774 ((eq backward-delete-char-untabify-method 'all)
2776 (if skip
2777 (let ((wh (- (point) (save-excursion (skip-chars-backward skip)
2778 (point)))))
2779 (+ arg (if (zerop wh) 0 (1- wh))))
2780 arg))
2781 killp))
2783 (defun zap-to-char (arg char)
2784 "Kill up to and including ARG'th occurrence of CHAR.
2785 Case is ignored if `case-fold-search' is non-nil in the current buffer.
2786 Goes backward if ARG is negative; error if CHAR not found."
2788 (if (char-table-p translation-table-for-input)
2789 (setq char (or (aref translation-table-for-input char) char)))
2790 (kill-region (point) (progn
2791 (search-forward (char-to-string char) nil nil arg)
2792 ; (goto-char (if (> arg 0) (1- (point)) (1+ (point))))
2793 (point))))
2795 ;; kill-line and its subroutines.
2797 (defcustom kill-whole-line nil
2798 "*If non-nil, `kill-line' with no arg at beg of line kills the whole line."
2799 :type 'boolean
2800 :group 'killing)
2802 (defun kill-line (&optional arg)
2803 "Kill the rest of the current line; if no nonblanks there, kill thru newline.
2804 With prefix argument, kill that many lines from point.
2805 Negative arguments kill lines backward.
2806 With zero argument, kills the text before point on the current line.
2809 a number counts as a prefix arg.
2811 To kill a whole line, when point is not at the beginning, type \
2814 If `kill-whole-line' is non-nil, then this command kills the whole line
2815 including its terminating newline, when used at the beginning of a line
2816 with no argument. As a consequence, you can always kill a whole line
2819 If you want to append the killed line to the last killed text,
2822 If the buffer is read-only, Emacs will beep and refrain from deleting
2823 the line, but put the line in the kill ring anyway. This means that
2824 you can use this command to copy text from a read-only buffer.
2825 \(If the variable `kill-read-only-ok' is non-nil, then this won't
2826 even beep.)"
2827 (interactive "P")
2828 (kill-region (point)
2829 ;; It is better to move point to the other end of the kill
2830 ;; before killing. That way, in a read-only buffer, point
2831 ;; moves across the text that is copied to the kill ring.
2832 ;; The choice has no effect on undo now that undo records
2833 ;; the value of point from before the command was run.
2834 (progn
2835 (if arg
2836 (forward-visible-line (prefix-numeric-value arg))
2837 (if (eobp)
2838 (signal 'end-of-buffer nil))
2839 (let ((end
2840 (save-excursion
2841 (end-of-visible-line) (point))))
2842 (if (or (save-excursion
2843 ;; If trailing whitespace is visible,
2844 ;; don't treat it as nothing.
2845 (unless show-trailing-whitespace
2847 (= (point) end))
2848 (and kill-whole-line (bolp)))
2849 (forward-visible-line 1)
2850 (goto-char end))))
2851 (point))))
2853 (defun kill-whole-line (&optional arg)
2854 "Kill current line.
2855 With prefix arg, kill that many lines starting from the current line.
2856 If arg is negative, kill backward. Also kill the preceding newline.
2858 If arg is zero, kill current line but exclude the trailing newline."
2859 (interactive "p")
2860 (if (and (> arg 0) (eobp) (save-excursion (forward-visible-line 0) (eobp)))
2861 (signal 'end-of-buffer nil))
2862 (if (and (< arg 0) (bobp) (save-excursion (end-of-visible-line) (bobp)))
2863 (signal 'beginning-of-buffer nil))
2864 (unless (eq last-command 'kill-region)
2865 (kill-new "")
2866 (setq last-command 'kill-region))
2867 (cond ((zerop arg)
2868 ;; We need to kill in two steps, because the previous command
2869 ;; could have been a kill command, in which case the text
2870 ;; before point needs to be prepended to the current kill
2871 ;; ring entry and the text after point appended. Also, we
2872 ;; need to use save-excursion to avoid copying the same text
2873 ;; twice to the kill ring in read-only buffers.
2874 (save-excursion
2875 (kill-region (point) (progn (forward-visible-line 0) (point))))
2876 (kill-region (point) (progn (end-of-visible-line) (point))))
2877 ((< arg 0)
2878 (save-excursion
2879 (kill-region (point) (progn (end-of-visible-line) (point))))
2880 (kill-region (point)
2881 (progn (forward-visible-line (1+ arg))
2882 (unless (bobp) (backward-char))
2883 (point))))
2884 (t
2885 (save-excursion
2886 (kill-region (point) (progn (forward-visible-line 0) (point))))
2887 (kill-region (point)
2888 (progn (forward-visible-line arg) (point))))))
2890 (defun forward-visible-line (arg)
2891 "Move forward by ARG lines, ignoring currently invisible newlines only.
2892 If ARG is negative, move backward -ARG lines.
2893 If ARG is zero, move to the beginning of the current line."
2894 (condition-case nil
2895 (if (> arg 0)
2896 (progn
2897 (while (> arg 0)
2898 (or (zerop (forward-line 1))
2899 (signal 'end-of-buffer nil))
2900 ;; If the newline we just skipped is invisible,
2901 ;; don't count it.
2902 (let ((prop
2903 (get-char-property (1- (point)) 'invisible)))
2904 (if (if (eq buffer-invisibility-spec t)
2905 prop
2906 (or (memq prop buffer-invisibility-spec)
2907 (assq prop buffer-invisibility-spec)))
2908 (setq arg (1+ arg))))
2909 (setq arg (1- arg)))
2910 ;; If invisible text follows, and it is a number of complete lines,
2911 ;; skip it.
2912 (let ((opoint (point)))
2913 (while (and (not (eobp))
2914 (let ((prop
2915 (get-char-property (point) 'invisible)))
2916 (if (eq buffer-invisibility-spec t)
2917 prop
2918 (or (memq prop buffer-invisibility-spec)
2919 (assq prop buffer-invisibility-spec)))))
2920 (goto-char
2921 (if (get-text-property (point) 'invisible)
2922 (or (next-single-property-change (point) 'invisible)
2923 (point-max))
2924 (next-overlay-change (point)))))
2925 (unless (bolp)
2926 (goto-char opoint))))
2927 (let ((first t))
2928 (while (or first (<= arg 0))
2929 (if first
2930 (beginning-of-line)
2931 (or (zerop (forward-line -1))
2932 (signal 'beginning-of-buffer nil)))
2933 ;; If the newline we just moved to is invisible,
2934 ;; don't count it.
2935 (unless (bobp)
2936 (let ((prop
2937 (get-char-property (1- (point)) 'invisible)))
2938 (unless (if (eq buffer-invisibility-spec t)
2939 prop
2940 (or (memq prop buffer-invisibility-spec)
2941 (assq prop buffer-invisibility-spec)))
2942 (setq arg (1+ arg)))))
2943 (setq first nil))
2944 ;; If invisible text follows, and it is a number of complete lines,
2945 ;; skip it.
2946 (let ((opoint (point)))
2947 (while (and (not (bobp))
2948 (let ((prop
2949 (get-char-property (1- (point)) 'invisible)))
2950 (if (eq buffer-invisibility-spec t)
2951 prop
2952 (or (memq prop buffer-invisibility-spec)
2953 (assq prop buffer-invisibility-spec)))))
2954 (goto-char
2955 (if (get-text-property (1- (point)) 'invisible)
2956 (or (previous-single-property-change (point) 'invisible)
2957 (point-min))
2958 (previous-overlay-change (point)))))
2959 (unless (bolp)
2960 (goto-char opoint)))))
2961 ((beginning-of-buffer end-of-buffer)
2962 nil)))
2964 (defun end-of-visible-line ()
2965 "Move to end of current visible line."
2966 (end-of-line)
2967 ;; If the following character is currently invisible,
2968 ;; skip all characters with that same `invisible' property value,
2969 ;; then find the next newline.
2970 (while (and (not (eobp))
2971 (save-excursion
2973 (let ((prop
2974 (get-char-property (point) 'invisible)))
2975 (if (eq buffer-invisibility-spec t)
2976 prop
2977 (or (memq prop buffer-invisibility-spec)
2978 (assq prop buffer-invisibility-spec))))))
2980 (if (get-text-property (point) 'invisible)
2981 (goto-char (next-single-property-change (point) 'invisible))
2982 (goto-char (next-overlay-change (point))))
2983 (end-of-line)))
2984 \f
2985 (defun insert-buffer (buffer)
2986 "Insert after point the contents of BUFFER.
2987 Puts mark after the inserted text.
2988 BUFFER may be a buffer or a buffer name.
2990 This function is meant for the user to run interactively.
2991 Don't call it from programs: use `insert-buffer-substring' instead!"
2992 (interactive
2993 (list
2994 (progn
2995 (barf-if-buffer-read-only)
2996 (read-buffer "Insert buffer: "
2997 (if (eq (selected-window) (next-window (selected-window)))
2998 (other-buffer (current-buffer))
2999 (window-buffer (next-window (selected-window))))
3000 t))))
3001 (push-mark
3002 (save-excursion
3003 (insert-buffer-substring (get-buffer buffer))
3004 (point)))
3005 nil)
3007 (defun append-to-buffer (buffer start end)
3008 "Append to specified buffer the text of the region.
3009 It is inserted into that buffer before its point.
3011 When calling from a program, give three arguments:
3012 BUFFER (or buffer name), START and END.
3013 START and END specify the portion of the current buffer to be copied."
3014 (interactive
3015 (list (read-buffer "Append to buffer: " (other-buffer (current-buffer) t))
3016 (region-beginning) (region-end)))
3017 (let ((oldbuf (current-buffer)))
3018 (save-excursion
3019 (let* ((append-to (get-buffer-create buffer))
3020 (windows (get-buffer-window-list append-to t t))
3021 point)
3022 (set-buffer append-to)
3023 (setq point (point))
3024 (barf-if-buffer-read-only)
3025 (insert-buffer-substring oldbuf start end)
3026 (dolist (window windows)
3027 (when (= (window-point window) point)
3028 (set-window-point window (point))))))))
3030 (defun prepend-to-buffer (buffer start end)
3031 "Prepend to specified buffer the text of the region.
3032 It is inserted into that buffer after its point.
3034 When calling from a program, give three arguments:
3035 BUFFER (or buffer name), START and END.
3036 START and END specify the portion of the current buffer to be copied."
3038 (let ((oldbuf (current-buffer)))
3039 (save-excursion
3040 (set-buffer (get-buffer-create buffer))
3041 (barf-if-buffer-read-only)
3042 (save-excursion
3043 (insert-buffer-substring oldbuf start end)))))
3045 (defun copy-to-buffer (buffer start end)
3046 "Copy to specified buffer the text of the region.
3047 It is inserted into that buffer, replacing existing text there.
3049 When calling from a program, give three arguments:
3050 BUFFER (or buffer name), START and END.
3051 START and END specify the portion of the current buffer to be copied."
3053 (let ((oldbuf (current-buffer)))
3054 (with-current-buffer (get-buffer-create buffer)
3055 (barf-if-buffer-read-only)
3056 (erase-buffer)
3057 (save-excursion
3058 (insert-buffer-substring oldbuf start end)))))
3059 \f
3060 (put 'mark-inactive 'error-conditions '(mark-inactive error))
3061 (put 'mark-inactive 'error-message "The mark is not active now")
3063 (defvar activate-mark-hook nil
3064 "Hook run when the mark becomes active.
3065 It is also run at the end of a command, if the mark is active and
3066 it is possible that the region may have changed")
3068 (defvar deactivate-mark-hook nil
3069 "Hook run when the mark becomes inactive.")
3071 (defun mark (&optional force)
3072 "Return this buffer's mark value as integer; error if mark inactive.
3073 If optional argument FORCE is non-nil, access the mark value
3074 even if the mark is not currently active, and return nil
3075 if there is no mark at all.
3077 If you are using this in an editing command, you are most likely making
3078 a mistake; see the documentation of `set-mark'."
3079 (if (or force (not transient-mark-mode) mark-active mark-even-if-inactive)
3080 (marker-position (mark-marker))
3081 (signal 'mark-inactive nil)))
3083 ;; Many places set mark-active directly, and several of them failed to also
3084 ;; run deactivate-mark-hook. This shorthand should simplify.
3085 (defsubst deactivate-mark ()
3086 "Deactivate the mark by setting `mark-active' to nil.
3087 \(That makes a difference only in Transient Mark mode.)
3088 Also runs the hook `deactivate-mark-hook'."
3089 (cond
3090 ((eq transient-mark-mode 'lambda)
3091 (setq transient-mark-mode nil))
3092 (transient-mark-mode
3093 (setq mark-active nil)
3094 (run-hooks 'deactivate-mark-hook))))
3096 (defun set-mark (pos)
3097 "Set this buffer's mark to POS. Don't use this function!
3098 That is to say, don't use this function unless you want
3099 the user to see that the mark has moved, and you want the previous
3100 mark position to be lost.
3102 Normally, when a new mark is set, the old one should go on the stack.
3103 This is why most applications should use `push-mark', not `set-mark'.
3105 Novice Emacs Lisp programmers often try to use the mark for the wrong
3106 purposes. The mark saves a location for the user's convenience.
3107 Most editing commands should not alter the mark.
3108 To remember a location for internal use in the Lisp program,
3109 store it in a Lisp variable. Example:
3111 (let ((beg (point))) (forward-line 1) (delete-region beg (point)))."
3113 (if pos
3114 (progn
3115 (setq mark-active t)
3116 (run-hooks 'activate-mark-hook)
3117 (set-marker (mark-marker) pos (current-buffer)))
3118 ;; Normally we never clear mark-active except in Transient Mark mode.
3119 ;; But when we actually clear out the mark value too,
3120 ;; we must clear mark-active in any mode.
3121 (setq mark-active nil)
3122 (run-hooks 'deactivate-mark-hook)
3123 (set-marker (mark-marker) nil)))
3125 (defvar mark-ring nil
3126 "The list of former marks of the current buffer, most recent first.")
3127 (make-variable-buffer-local 'mark-ring)
3128 (put 'mark-ring 'permanent-local t)
3130 (defcustom mark-ring-max 16
3131 "*Maximum size of mark ring. Start discarding off end if gets this big."
3132 :type 'integer
3133 :group 'editing-basics)
3135 (defvar global-mark-ring nil
3136 "The list of saved global marks, most recent first.")
3138 (defcustom global-mark-ring-max 16
3139 "*Maximum size of global mark ring. \
3140 Start discarding off end if gets this big."
3141 :type 'integer
3142 :group 'editing-basics)
3144 (defun pop-to-mark-command ()
3145 "Jump to mark, and pop a new position for mark off the ring
3146 \(does not affect global mark ring\)."
3147 (interactive)
3148 (if (null (mark t))
3149 (error "No mark set in this buffer")
3150 (goto-char (mark t))
3151 (pop-mark)))
3153 (defun push-mark-command (arg &optional nomsg)
3154 "Set mark at where point is.
3155 If no prefix arg and mark is already set there, just activate it.
3156 Display `Mark set' unless the optional second arg NOMSG is non-nil."
3157 (interactive "P")
3158 (let ((mark (marker-position (mark-marker))))
3159 (if (or arg (null mark) (/= mark (point)))
3160 (push-mark nil nomsg t)
3161 (setq mark-active t)
3162 (run-hooks 'activate-mark-hook)
3163 (unless nomsg
3164 (message "Mark activated")))))
3166 (defcustom set-mark-command-repeat-pop nil
3169 will pop twice."
3170 :type 'boolean
3171 :group 'editing)
3173 (defun set-mark-command (arg)
3174 "Set mark at where point is, or jump to mark.
3175 With no prefix argument, set mark, and push old mark position on local
3176 mark ring; also push mark on global mark ring if last mark was set in
3177 another buffer. Immediately repeating the command activates
3178 `transient-mark-mode' temporarily.
3181 jump to mark, and pop a new position
3182 for mark off the local mark ring \(this does not affect the global
3184 mark ring \(see `pop-global-mark'\).
3187 the next position off the local (or global) mark ring.
3191 set mark where point is.
3193 Novice Emacs Lisp programmers often try to use the mark for the wrong
3194 purposes. See the documentation of `set-mark' for more information."
3195 (interactive "P")
3196 (if (eq transient-mark-mode 'lambda)
3197 (setq transient-mark-mode nil))
3198 (cond
3199 ((and (consp arg) (> (prefix-numeric-value arg) 4))
3200 (push-mark-command nil))
3201 ((not (eq this-command 'set-mark-command))
3202 (if arg
3203 (pop-to-mark-command)
3204 (push-mark-command t)))
3205 ((and set-mark-command-repeat-pop
3206 (eq last-command 'pop-to-mark-command))
3207 (setq this-command 'pop-to-mark-command)
3208 (pop-to-mark-command))
3209 ((and set-mark-command-repeat-pop
3210 (eq last-command 'pop-global-mark)
3211 (not arg))
3212 (setq this-command 'pop-global-mark)
3213 (pop-global-mark))
3214 (arg
3215 (setq this-command 'pop-to-mark-command)
3216 (pop-to-mark-command))
3217 ((and (eq last-command 'set-mark-command)
3218 mark-active (null transient-mark-mode))
3219 (setq transient-mark-mode 'lambda)
3220 (message "Transient-mark-mode temporarily enabled"))
3221 (t
3222 (push-mark-command nil))))
3224 (defun push-mark (&optional location nomsg activate)
3225 "Set mark at LOCATION (point, by default) and push old mark on mark ring.
3226 If the last global mark pushed was not in the current buffer,
3227 also push LOCATION on the global mark ring.
3228 Display `Mark set' unless the optional second arg NOMSG is non-nil.
3229 In Transient Mark mode, activate mark if optional third arg ACTIVATE non-nil.
3231 Novice Emacs Lisp programmers often try to use the mark for the wrong
3232 purposes. See the documentation of `set-mark' for more information.
3234 In Transient Mark mode, this does not activate the mark."
3235 (unless (null (mark t))
3236 (setq mark-ring (cons (copy-marker (mark-marker)) mark-ring))
3237 (when (> (length mark-ring) mark-ring-max)
3238 (move-marker (car (nthcdr mark-ring-max mark-ring)) nil)
3239 (setcdr (nthcdr (1- mark-ring-max) mark-ring) nil)))
3240 (set-marker (mark-marker) (or location (point)) (current-buffer))
3241 ;; Now push the mark on the global mark ring.
3242 (if (and global-mark-ring
3243 (eq (marker-buffer (car global-mark-ring)) (current-buffer)))
3244 ;; The last global mark pushed was in this same buffer.
3245 ;; Don't push another one.
3246 nil
3247 (setq global-mark-ring (cons (copy-marker (mark-marker)) global-mark-ring))
3248 (when (> (length global-mark-ring) global-mark-ring-max)
3249 (move-marker (car (nthcdr global-mark-ring-max global-mark-ring)) nil)
3250 (setcdr (nthcdr (1- global-mark-ring-max) global-mark-ring) nil)))
3251 (or nomsg executing-kbd-macro (> (minibuffer-depth) 0)
3252 (message "Mark set"))
3253 (if (or activate (not transient-mark-mode))
3254 (set-mark (mark t)))
3255 nil)
3257 (defun pop-mark ()
3258 "Pop off mark ring into the buffer's actual mark.
3259 Does not set point. Does nothing if mark ring is empty."
3260 (when mark-ring
3261 (setq mark-ring (nconc mark-ring (list (copy-marker (mark-marker)))))
3262 (set-marker (mark-marker) (+ 0 (car mark-ring)) (current-buffer))
3263 (move-marker (car mark-ring) nil)
3264 (if (null (mark t)) (ding))
3265 (setq mark-ring (cdr mark-ring)))
3266 (deactivate-mark))
3268 (defalias 'exchange-dot-and-mark 'exchange-point-and-mark)
3269 (defun exchange-point-and-mark (&optional arg)
3270 "Put the mark where point is now, and point where the mark is now.
3271 This command works even when the mark is not active,
3272 and it reactivates the mark.
3273 With prefix arg, `transient-mark-mode' is enabled temporarily."
3274 (interactive "P")
3275 (if arg
3276 (if mark-active
3277 (if (null transient-mark-mode)
3278 (setq transient-mark-mode 'lambda))
3279 (setq arg nil)))
3280 (unless arg
3281 (let ((omark (mark t)))
3282 (if (null omark)
3283 (error "No mark set in this buffer"))
3284 (set-mark (point))
3285 (goto-char omark)
3286 nil)))
3288 (define-minor-mode transient-mark-mode
3289 "Toggle Transient Mark mode.
3290 With arg, turn Transient Mark mode on if arg is positive, off otherwise.
3292 In Transient Mark mode, when the mark is active, the region is highlighted.
3294 So do certain other operations that set the mark
3295 but whose main purpose is something else--for example,
3301 Many commands change their behavior when Transient Mark mode is in effect
3302 and the mark is active, by acting on the region instead of their usual
3303 default part of the buffer's text. Examples of such commands include
3308 commands which are sensitive to the Transient Mark mode."
3309 :global t :group 'editing-basics)
3311 (defvar widen-automatically t
3312 "Non-nil means it is ok for commands to call `widen' when they want to.
3313 Some commands will do this in order to go to positions outside
3314 the current accessible part of the buffer.
3316 If `widen-automatically' is nil, these commands will do something else
3317 as a fallback, and won't change the buffer bounds.")
3319 (defun pop-global-mark ()
3320 "Pop off global mark ring and jump to the top location."
3321 (interactive)
3322 ;; Pop entries which refer to non-existent buffers.
3323 (while (and global-mark-ring (not (marker-buffer (car global-mark-ring))))
3324 (setq global-mark-ring (cdr global-mark-ring)))
3325 (or global-mark-ring
3326 (error "No global mark set"))
3327 (let* ((marker (car global-mark-ring))
3328 (buffer (marker-buffer marker))
3329 (position (marker-position marker)))
3330 (setq global-mark-ring (nconc (cdr global-mark-ring)
3331 (list (car global-mark-ring))))
3332 (set-buffer buffer)
3333 (or (and (>= position (point-min))
3334 (<= position (point-max)))
3335 (if widen-automatically
3336 (widen)
3337 (error "Global mark position is outside accessible part of buffer")))
3338 (goto-char position)
3339 (switch-to-buffer buffer)))
3340 \f
3341 (defcustom next-line-add-newlines nil
3342 "*If non-nil, `next-line' inserts newline to avoid `end of buffer' error."
3343 :type 'boolean
3344 :version "21.1"
3345 :group 'editing-basics)
3347 (defun next-line (&optional arg try-vscroll)
3348 "Move cursor vertically down ARG lines.
3349 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
3350 If there is no character in the target line exactly under the current column,
3351 the cursor is positioned after the character in that line which spans this
3352 column, or at the end of the line if it is not long enough.
3353 If there is no line in the buffer after this one, behavior depends on the
3354 value of `next-line-add-newlines'. If non-nil, it inserts a newline character
3355 to create a line, and moves the cursor to that line. Otherwise it moves the
3356 cursor to the end of the buffer.
3359 a semipermanent goal column for this command.
3360 Then instead of trying to move exactly vertically (or as close as possible),
3361 this command moves to the specified goal column (or as close as possible).
3362 The goal column is stored in the variable `goal-column', which is nil
3363 when there is no goal column.
3365 If you are thinking of using this in a Lisp program, consider
3366 using `forward-line' instead. It is usually easier to use
3367 and more reliable (no dependence on goal column, etc.)."
3369 (or arg (setq arg 1))
3370 (if (and next-line-add-newlines (= arg 1))
3371 (if (save-excursion (end-of-line) (eobp))
3372 ;; When adding a newline, don't expand an abbrev.
3373 (let ((abbrev-mode nil))
3374 (end-of-line)
3376 (line-move arg nil nil try-vscroll))
3377 (if (interactive-p)
3378 (condition-case nil
3379 (line-move arg nil nil try-vscroll)
3380 ((beginning-of-buffer end-of-buffer) (ding)))
3381 (line-move arg nil nil try-vscroll)))
3382 nil)
3384 (defun previous-line (&optional arg try-vscroll)
3385 "Move cursor vertically up ARG lines.
3386 Interactively, vscroll tall lines if `auto-window-vscroll' is enabled.
3387 If there is no character in the target line exactly over the current column,
3388 the cursor is positioned after the character in that line which spans this
3389 column, or at the end of the line if it is not long enough.
3392 a semipermanent goal column for this command.
3393 Then instead of trying to move exactly vertically (or as close as possible),
3394 this command moves to the specified goal column (or as close as possible).
3395 The goal column is stored in the variable `goal-column', which is nil
3396 when there is no goal column.
3398 If you are thinking of using this in a Lisp program, consider using
3399 `forward-line' with a negative argument instead. It is usually easier
3400 to use and more reliable (no dependence on goal column, etc.)."
3402 (or arg (setq arg 1))
3403 (if (interactive-p)
3404 (condition-case nil
3405 (line-move (- arg) nil nil try-vscroll)
3406 ((beginning-of-buffer end-of-buffer) (ding)))
3407 (line-move (- arg) nil nil try-vscroll))
3408 nil)
3410 (defcustom track-eol nil
3411 "*Non-nil means vertical motion starting at end of line keeps to ends of lines.
3412 This means moving to the end of each line moved onto.
3413 The beginning of a blank line does not count as the end of a line."
3414 :type 'boolean
3415 :group 'editing-basics)
3417 (defcustom goal-column nil
3419 :type '(choice integer
3420 (const :tag "None" nil))
3421 :group 'editing-basics)
3422 (make-variable-buffer-local 'goal-column)
3424 (defvar temporary-goal-column 0
3425 "Current goal column for vertical motion.
3426 It is the column where point was
3427 at the start of current run of vertical motion commands.
3428 When the `track-eol' feature is doing its job, the value is 9999.")
3430 (defcustom line-move-ignore-invisible t
3432 Outline mode sets this."
3433 :type 'boolean
3434 :group 'editing-basics)
3436 (defun line-move-invisible-p (pos)
3437 "Return non-nil if the character after POS is currently invisible."
3438 (let ((prop
3439 (get-char-property pos 'invisible)))
3440 (if (eq buffer-invisibility-spec t)
3441 prop
3442 (or (memq prop buffer-invisibility-spec)
3443 (assq prop buffer-invisibility-spec)))))
3445 ;; This is like line-move-1 except that it also performs
3446 ;; vertical scrolling of tall images if appropriate.
3447 ;; That is not really a clean thing to do, since it mixes
3448 ;; scrolling with cursor motion. But so far we don't have
3449 ;; a cleaner solution to the problem of making C-n do something
3450 ;; useful given a tall image.
3451 (defun line-move (arg &optional noerror to-end try-vscroll)
3452 (if (and auto-window-vscroll try-vscroll
3453 ;; But don't vscroll in a keyboard macro.
3454 (not defining-kbd-macro)
3455 (not executing-kbd-macro))
3456 (let ((forward (> arg 0))
3457 (part (nth 2 (pos-visible-in-window-p (point) nil t))))
3458 (if (and (consp part)
3459 (> (if forward (cdr part) (car part)) 0))
3460 (set-window-vscroll nil
3461 (if forward
3462 (+ (window-vscroll nil t)
3463 (min (cdr part)
3464 (* (frame-char-height) arg)))
3465 (max 0
3466 (- (window-vscroll nil t)
3467 (min (car part)
3468 (* (frame-char-height) (- arg))))))
3469 t)
3470 (set-window-vscroll nil 0)
3471 (when (line-move-1 arg noerror to-end)
3472 (when (not forward)
3473 ;; Update display before calling pos-visible-in-window-p,
3474 ;; because it depends on window-start being up-to-date.
3475 (sit-for 0)
3476 ;; If the current line is partly hidden at the bottom,
3477 ;; scroll it partially up so as to unhide the bottom.
3478 (if (and (setq part (nth 2 (pos-visible-in-window-p
3479 (line-beginning-position) nil t)))
3480 (> (cdr part) 0))
3481 (set-window-vscroll nil (cdr part) t)))
3482 t)))
3483 (line-move-1 arg noerror to-end)))
3485 ;; This is the guts of next-line and previous-line.
3486 ;; Arg says how many lines to move.
3487 ;; The value is t if we can move the specified number of lines.
3488 (defun line-move-1 (arg &optional noerror to-end)
3489 ;; Don't run any point-motion hooks, and disregard intangibility,
3490 ;; for intermediate positions.
3491 (let ((inhibit-point-motion-hooks t)
3492 (opoint (point))
3493 (forward (> arg 0)))
3494 (unwind-protect
3495 (progn
3496 (if (not (memq last-command '(next-line previous-line)))
3497 (setq temporary-goal-column
3498 (if (and track-eol (eolp)
3499 ;; Don't count beg of empty line as end of line
3500 ;; unless we just did explicit end-of-line.
3501 (or (not (bolp)) (eq last-command 'end-of-line)))
3502 9999
3503 (current-column))))
3505 (if (and (not (integerp selective-display))
3506 (not line-move-ignore-invisible))
3507 ;; Use just newline characters.
3508 ;; Set ARG to 0 if we move as many lines as requested.
3509 (or (if (> arg 0)
3510 (progn (if (> arg 1) (forward-line (1- arg)))
3511 ;; This way of moving forward ARG lines
3512 ;; verifies that we have a newline after the last one.
3513 ;; It doesn't get confused by intangible text.
3514 (end-of-line)
3515 (if (zerop (forward-line 1))
3516 (setq arg 0)))
3517 (and (zerop (forward-line arg))
3518 (bolp)
3519 (setq arg 0)))
3520 (unless noerror
3521 (signal (if (< arg 0)
3522 'beginning-of-buffer
3523 'end-of-buffer)
3524 nil)))
3525 ;; Move by arg lines, but ignore invisible ones.
3526 (let (done)
3527 (while (and (> arg 0) (not done))
3528 ;; If the following character is currently invisible,
3529 ;; skip all characters with that same `invisible' property value.
3530 (while (and (not (eobp)) (line-move-invisible-p (point)))
3531 (goto-char (next-char-property-change (point))))
3532 ;; Now move a line.
3533 (end-of-line)
3534 ;; If there's no invisibility here, move over the newline.
3535 (cond
3536 ((eobp)
3537 (if (not noerror)
3538 (signal 'end-of-buffer nil)
3539 (setq done t)))
3540 ((and (> arg 1) ;; Use vertical-motion for last move
3541 (not (integerp selective-display))
3542 (not (line-move-invisible-p (point))))
3543 ;; We avoid vertical-motion when possible
3544 ;; because that has to fontify.
3545 (forward-line 1))
3546 ;; Otherwise move a more sophisticated way.
3547 ((zerop (vertical-motion 1))
3548 (if (not noerror)
3549 (signal 'end-of-buffer nil)
3550 (setq done t))))
3551 (unless done
3552 (setq arg (1- arg))))
3553 ;; The logic of this is the same as the loop above,
3554 ;; it just goes in the other direction.
3555 (while (and (< arg 0) (not done))
3556 (beginning-of-line)
3557 (cond
3558 ((bobp)
3559 (if (not noerror)
3560 (signal 'beginning-of-buffer nil)
3561 (setq done t)))
3562 ((and (< arg -1) ;; Use vertical-motion for last move
3563 (not (integerp selective-display))
3564 (not (line-move-invisible-p (1- (point)))))
3565 (forward-line -1))
3566 ((zerop (vertical-motion -1))
3567 (if (not noerror)
3568 (signal 'beginning-of-buffer nil)
3569 (setq done t))))
3570 (unless done
3571 (setq arg (1+ arg))
3572 (while (and ;; Don't move over previous invis lines
3573 ;; if our target is the middle of this line.
3574 (or (zerop (or goal-column temporary-goal-column))
3575 (< arg 0))
3576 (not (bobp)) (line-move-invisible-p (1- (point))))
3577 (goto-char (previous-char-property-change (point))))))))
3578 ;; This is the value the function returns.
3579 (= arg 0))
3581 (cond ((> arg 0)
3582 ;; If we did not move down as far as desired,
3583 ;; at least go to end of line.
3584 (end-of-line))
3585 ((< arg 0)
3586 ;; If we did not move up as far as desired,
3587 ;; at least go to beginning of line.
3588 (beginning-of-line))
3589 (t
3590 (line-move-finish (or goal-column temporary-goal-column)
3591 opoint forward))))))
3593 (defun line-move-finish (column opoint forward)
3594 (let ((repeat t))
3595 (while repeat
3596 ;; Set REPEAT to t to repeat the whole thing.
3597 (setq repeat nil)
3599 (let (new
3600 (line-beg (save-excursion (beginning-of-line) (point)))
3601 (line-end
3602 ;; Compute the end of the line
3603 ;; ignoring effectively invisible newlines.
3604 (save-excursion
3605 ;; Like end-of-line but ignores fields.
3607 (while (and (not (eobp)) (line-move-invisible-p (point)))
3608 (goto-char (next-char-property-change (point)))
3610 (point))))
3612 ;; Move to the desired column.
3613 (line-move-to-column column)
3614 (setq new (point))
3616 ;; Process intangibility within a line.
3617 ;; Move to the chosen destination position from above,
3618 ;; with intangibility processing enabled.
3620 (goto-char (point-min))
3621 (let ((inhibit-point-motion-hooks nil))
3622 (goto-char new)
3624 ;; If intangibility moves us to a different (later) place
3625 ;; in the same line, use that as the destination.
3626 (if (<= (point) line-end)
3627 (setq new (point))
3628 ;; If that position is "too late",
3629 ;; try the previous allowable position.
3630 ;; See if it is ok.
3631 (backward-char)
3632 (if (if forward
3633 ;; If going forward, don't accept the previous
3634 ;; allowable position if it is before the target line.
3635 (< line-beg (point))
3636 ;; If going backward, don't accept the previous
3637 ;; allowable position if it is still after the target line.
3638 (<= (point) line-end))
3639 (setq new (point))
3640 ;; As a last resort, use the end of the line.
3641 (setq new line-end))))
3643 ;; Now move to the updated destination, processing fields
3644 ;; as well as intangibility.
3645 (goto-char opoint)
3646 (let ((inhibit-point-motion-hooks nil))
3647 (goto-char
3648 (constrain-to-field new opoint nil t
3649 'inhibit-line-move-field-capture)))
3651 ;; If all this moved us to a different line,
3652 ;; retry everything within that new line.
3653 (when (or (< (point) line-beg) (> (point) line-end))
3654 ;; Repeat the intangibility and field processing.
3655 (setq repeat t))))))
3657 (defun line-move-to-column (col)
3658 "Try to find column COL, considering invisibility.
3659 This function works only in certain cases,
3660 because what we really need is for `move-to-column'
3661 and `current-column' to be able to ignore invisible text."
3662 (if (zerop col)
3663 (beginning-of-line)
3664 (move-to-column col))
3666 (when (and line-move-ignore-invisible
3667 (not (bolp)) (line-move-invisible-p (1- (point))))
3668 (let ((normal-location (point))
3669 (normal-column (current-column)))
3670 ;; If the following character is currently invisible,
3671 ;; skip all characters with that same `invisible' property value.
3672 (while (and (not (eobp))
3673 (line-move-invisible-p (point)))
3674 (goto-char (next-char-property-change (point))))
3675 ;; Have we advanced to a larger column position?
3676 (if (> (current-column) normal-column)
3677 ;; We have made some progress towards the desired column.
3678 ;; See if we can make any further progress.
3679 (line-move-to-column (+ (current-column) (- col normal-column)))
3680 ;; Otherwise, go to the place we originally found
3681 ;; and move back over invisible text.
3682 ;; that will get us to the same place on the screen
3683 ;; but with a more reasonable buffer position.
3684 (goto-char normal-location)
3685 (let ((line-beg (save-excursion (beginning-of-line) (point))))
3686 (while (and (not (bolp)) (line-move-invisible-p (1- (point))))
3687 (goto-char (previous-char-property-change (point) line-beg))))))))
3689 (defun move-end-of-line (arg)
3690 "Move point to end of current line.
3691 With argument ARG not nil or 1, move forward ARG - 1 lines first.
3692 If point reaches the beginning or end of buffer, it stops there.
3693 To ignore intangibility, bind `inhibit-point-motion-hooks' to t.
3695 This command does not move point across a field boundary unless doing so
3696 would move beyond there to a different line; if ARG is nil or 1, and
3697 point starts at a field boundary, point does not move. To ignore field
3698 boundaries bind `inhibit-field-text-motion' to t."
3699 (interactive "p")
3700 (or arg (setq arg 1))
3701 (let (done)
3702 (while (not done)
3703 (let ((newpos
3704 (save-excursion
3705 (let ((goal-column 0))
3706 (and (line-move arg t)
3707 (not (bobp))
3708 (progn
3709 (while (and (not (bobp)) (line-move-invisible-p (1- (point))))
3710 (goto-char (previous-char-property-change (point))))
3711 (backward-char 1)))
3712 (point)))))
3713 (goto-char newpos)
3714 (if (and (> (point) newpos)
3716 (backward-char 1)
3717 (if (and (> (point) newpos) (not (eobp))
3719 ;; If we skipped something intangible
3720 ;; and now we're not really at eol,
3721 ;; keep going.
3722 (setq arg 1)
3723 (setq done t)))))))
3725 (defun move-beginning-of-line (arg)
3726 "Move point to beginning of current display line.
3727 With argument ARG not nil or 1, move forward ARG - 1 lines first.
3728 If point reaches the beginning or end of buffer, it stops there.
3729 To ignore intangibility, bind `inhibit-point-motion-hooks' to t.
3731 This command does not move point across a field boundary unless doing so
3732 would move beyond there to a different line; if ARG is nil or 1, and
3733 point starts at a field boundary, point does not move. To ignore field
3734 boundaries bind `inhibit-field-text-motion' to t."
3735 (interactive "p")
3736 (or arg (setq arg 1))
3737 (if (/= arg 1)
3738 (line-move (1- arg) t))
3739 (beginning-of-line 1)
3740 (let ((orig (point)))
3741 (vertical-motion 0)
3742 (if (/= orig (point))
3743 (goto-char (constrain-to-field (point) orig (/= arg 1) t nil)))))
3746 ;;; Many people have said they rarely use this feature, and often type
3747 ;;; it by accident. Maybe it shouldn't even be on a key.
3748 (put 'set-goal-column 'disabled t)
3750 (defun set-goal-column (arg)
3752 Those commands will move to this position in the line moved to
3753 rather than trying to keep the same horizontal position.
3754 With a non-nil argument, clears out the goal column
3756 The goal column is stored in the variable `goal-column'."
3757 (interactive "P")
3758 (if arg
3759 (progn
3760 (setq goal-column nil)
3761 (message "No goal column"))
3762 (setq goal-column (current-column))
3763 ;; The older method below can be erroneous if `set-goal-column' is bound
3764 ;; to a sequence containing %
3765 ;;(message (substitute-command-keys
3767 ;;goal-column)
3768 (message "%s"
3769 (concat
3770 (format "Goal column %d " goal-column)
3771 (substitute-command-keys
3774 )
3775 nil)
3776 \f
3778 (defun scroll-other-window-down (lines)
3780 For more details, see the documentation for `scroll-other-window'."
3781 (interactive "P")
3782 (scroll-other-window
3783 ;; Just invert the argument's meaning.
3784 ;; We can do that without knowing which window it will be.
3785 (if (eq lines '-) nil
3786 (if (null lines) '-
3787 (- (prefix-numeric-value lines))))))
3789 (defun beginning-of-buffer-other-window (arg)
3790 "Move point to the beginning of the buffer in the other window.
3791 Leave mark at previous position.
3792 With arg N, put point N/10 of the way from the true beginning."
3793 (interactive "P")
3794 (let ((orig-window (selected-window))
3795 (window (other-window-for-scrolling)))
3796 ;; We use unwind-protect rather than save-window-excursion
3797 ;; because the latter would preserve the things we want to change.
3798 (unwind-protect
3799 (progn
3800 (select-window window)
3801 ;; Set point and mark in that window's buffer.
3802 (with-no-warnings
3803 (beginning-of-buffer arg))
3804 ;; Set point accordingly.
3805 (recenter '(t)))
3806 (select-window orig-window))))
3808 (defun end-of-buffer-other-window (arg)
3809 "Move point to the end of the buffer in the other window.
3810 Leave mark at previous position.
3811 With arg N, put point N/10 of the way from the true end."
3812 (interactive "P")
3813 ;; See beginning-of-buffer-other-window for comments.
3814 (let ((orig-window (selected-window))
3815 (window (other-window-for-scrolling)))
3816 (unwind-protect
3817 (progn
3818 (select-window window)
3819 (with-no-warnings
3820 (end-of-buffer arg))
3821 (recenter '(t)))
3822 (select-window orig-window))))
3823 \f
3824 (defun transpose-chars (arg)
3825 "Interchange characters around point, moving forward one character.
3826 With prefix arg ARG, effect is to take character before point
3827 and drag it forward past ARG other characters (backward if ARG negative).
3828 If no argument and at end of line, the previous two chars are exchanged."
3829 (interactive "*P")
3830 (and (null arg) (eolp) (forward-char -1))
3831 (transpose-subr 'forward-char (prefix-numeric-value arg)))
3833 (defun transpose-words (arg)
3834 "Interchange words around point, leaving point at end of them.
3835 With prefix arg ARG, effect is to take word before or around point
3836 and drag it forward past ARG other words (backward if ARG negative).
3837 If ARG is zero, the words around or after point and around or after mark
3838 are interchanged."
3839 ;; FIXME: `foo a!nd bar' should transpose into `bar and foo'.
3840 (interactive "*p")
3841 (transpose-subr 'forward-word arg))
3843 (defun transpose-sexps (arg)
3845 Does not work on a sexp that point is in the middle of
3846 if it is a list or string."
3847 (interactive "*p")
3848 (transpose-subr
3849 (lambda (arg)
3850 ;; Here we should try to simulate the behavior of
3851 ;; (cons (progn (forward-sexp x) (point))
3852 ;; (progn (forward-sexp (- x)) (point)))
3853 ;; Except that we don't want to rely on the second forward-sexp
3854 ;; putting us back to where we want to be, since forward-sexp-function
3855 ;; might do funny things like infix-precedence.
3856 (if (if (> arg 0)
3858 (and (not (bobp))
3860 ;; Jumping over a symbol. We might be inside it, mind you.
3861 (progn (funcall (if (> arg 0)
3862 'skip-syntax-backward 'skip-syntax-forward)
3863 "w_")
3864 (cons (save-excursion (forward-sexp arg) (point)) (point)))
3865 ;; Otherwise, we're between sexps. Take a step back before jumping
3866 ;; to make sure we'll obey the same precedence no matter which direction
3867 ;; we're going.
3868 (funcall (if (> arg 0) 'skip-syntax-backward 'skip-syntax-forward) " .")
3869 (cons (save-excursion (forward-sexp arg) (point))
3870 (progn (while (or (forward-comment (if (> arg 0) 1 -1))
3871 (not (zerop (funcall (if (> arg 0)
3872 'skip-syntax-forward
3873 'skip-syntax-backward)
3874 ".")))))
3875 (point)))))
3876 arg 'special))
3878 (defun transpose-lines (arg)
3879 "Exchange current line and previous line, leaving point after both.
3880 With argument ARG, takes previous line and moves it past ARG lines.
3881 With argument 0, interchanges line point is in with line mark is in."
3882 (interactive "*p")
3883 (transpose-subr (function
3884 (lambda (arg)
3885 (if (> arg 0)
3886 (progn
3887 ;; Move forward over ARG lines,
3888 ;; but create newlines if necessary.
3889 (setq arg (forward-line arg))
3891 (setq arg (1+ arg)))
3892 (if (> arg 0)
3893 (newline arg)))
3894 (forward-line arg))))
3895 arg))
3897 (defun transpose-subr (mover arg &optional special)
3898 (let ((aux (if special mover
3899 (lambda (x)
3900 (cons (progn (funcall mover x) (point))
3901 (progn (funcall mover (- x)) (point))))))
3902 pos1 pos2)
3903 (cond
3904 ((= arg 0)
3905 (save-excursion
3906 (setq pos1 (funcall aux 1))
3907 (goto-char (mark))
3908 (setq pos2 (funcall aux 1))
3909 (transpose-subr-1 pos1 pos2))
3910 (exchange-point-and-mark))
3911 ((> arg 0)
3912 (setq pos1 (funcall aux -1))
3913 (setq pos2 (funcall aux arg))
3914 (transpose-subr-1 pos1 pos2)
3915 (goto-char (car pos2)))
3916 (t
3917 (setq pos1 (funcall aux -1))
3918 (goto-char (car pos1))
3919 (setq pos2 (funcall aux arg))
3920 (transpose-subr-1 pos1 pos2)))))
3922 (defun transpose-subr-1 (pos1 pos2)
3923 (when (> (car pos1) (cdr pos1)) (setq pos1 (cons (cdr pos1) (car pos1))))
3924 (when (> (car pos2) (cdr pos2)) (setq pos2 (cons (cdr pos2) (car pos2))))
3925 (when (> (car pos1) (car pos2))
3926 (let ((swap pos1))
3927 (setq pos1 pos2 pos2 swap)))
3928 (if (> (cdr pos1) (car pos2)) (error "Don't have two things to transpose"))
3929 (atomic-change-group
3930 (let (word2)
3931 ;; FIXME: We first delete the two pieces of text, so markers that
3932 ;; used to point to after the text end up pointing to before it :-(
3933 (setq word2 (delete-and-extract-region (car pos2) (cdr pos2)))
3934 (goto-char (car pos2))
3935 (insert (delete-and-extract-region (car pos1) (cdr pos1)))
3936 (goto-char (car pos1))
3937 (insert word2))))
3938 \f
3939 (defun backward-word (&optional arg)
3940 "Move backward until encountering the beginning of a word.
3941 With argument, do this that many times."
3942 (interactive "p")
3943 (forward-word (- (or arg 1))))
3945 (defun mark-word (&optional arg allow-extend)
3946 "Set mark ARG words away from point.
3948 move to with the same argument.
3949 Interactively, if this command is repeated
3950 or (in Transient Mark mode) if the mark is active,
3951 it marks the next ARG words after the ones already marked."
3953 (cond ((and allow-extend
3954 (or (and (eq last-command this-command) (mark t))
3955 (and transient-mark-mode mark-active)))
3956 (setq arg (if arg (prefix-numeric-value arg)
3957 (if (< (mark) (point)) -1 1)))
3958 (set-mark
3959 (save-excursion
3960 (goto-char (mark))
3961 (forward-word arg)
3962 (point))))
3963 (t
3964 (push-mark
3965 (save-excursion
3966 (forward-word (prefix-numeric-value arg))
3967 (point))
3968 nil t))))
3970 (defun kill-word (arg)
3971 "Kill characters forward until encountering the end of a word.
3972 With argument, do this that many times."
3973 (interactive "p")
3974 (kill-region (point) (progn (forward-word arg) (point))))
3976 (defun backward-kill-word (arg)
3977 "Kill characters backward until encountering the end of a word.
3978 With argument, do this that many times."
3979 (interactive "p")
3980 (kill-word (- arg)))
3982 (defun current-word (&optional strict really-word)
3983 "Return the symbol or word that point is on (or a nearby one) as a string.
3984 The return value includes no text properties.
3985 If optional arg STRICT is non-nil, return nil unless point is within
3986 or adjacent to a symbol or word. In all cases the value can be nil
3987 if there is no word nearby.
3988 The function, belying its name, normally finds a symbol.
3989 If optional arg REALLY-WORD is non-nil, it finds just a word."
3990 (save-excursion
3991 (let* ((oldpoint (point)) (start (point)) (end (point))
3992 (syntaxes (if really-word "w" "w_"))
3993 (not-syntaxes (concat "^" syntaxes)))
3994 (skip-syntax-backward syntaxes) (setq start (point))
3995 (goto-char oldpoint)
3996 (skip-syntax-forward syntaxes) (setq end (point))
3997 (when (and (eq start oldpoint) (eq end oldpoint)
3998 ;; Point is neither within nor adjacent to a word.
3999 (not strict))
4000 ;; Look for preceding word in same line.
4001 (skip-syntax-backward not-syntaxes
4002 (save-excursion (beginning-of-line)
4003 (point)))
4004 (if (bolp)
4005 ;; No preceding word in same line.
4006 ;; Look for following word in same line.
4007 (progn
4008 (skip-syntax-forward not-syntaxes
4009 (save-excursion (end-of-line)
4010 (point)))
4011 (setq start (point))
4012 (skip-syntax-forward syntaxes)
4013 (setq end (point)))
4014 (setq end (point))
4015 (skip-syntax-backward syntaxes)
4016 (setq start (point))))
4017 ;; If we found something nonempty, return it as a string.
4018 (unless (= start end)
4019 (buffer-substring-no-properties start end)))))
4020 \f
4021 (defcustom fill-prefix nil
4022 "*String for filling to insert at front of new line, or nil for none."
4023 :type '(choice (const :tag "None" nil)
4024 string)
4025 :group 'fill)
4026 (make-variable-buffer-local 'fill-prefix)
4028 (defcustom auto-fill-inhibit-regexp nil
4029 "*Regexp to match lines which should not be auto-filled."
4030 :type '(choice (const :tag "None" nil)
4031 regexp)
4032 :group 'fill)
4034 (defvar comment-line-break-function 'comment-indent-new-line
4035 "*Mode-specific function which line breaks and continues a comment.
4037 This function is only called during auto-filling of a comment section.
4038 The function should take a single optional argument, which is a flag
4039 indicating whether it should use soft newlines.")
4041 ;; This function is used as the auto-fill-function of a buffer
4042 ;; when Auto-Fill mode is enabled.
4043 ;; It returns t if it really did any work.
4044 ;; (Actually some major modes use a different auto-fill function,
4045 ;; but this one is the default one.)
4046 (defun do-auto-fill ()
4047 (let (fc justify give-up
4048 (fill-prefix fill-prefix))
4049 (if (or (not (setq justify (current-justification)))
4050 (null (setq fc (current-fill-column)))
4051 (and (eq justify 'left)
4052 (<= (current-column) fc))
4053 (and auto-fill-inhibit-regexp
4054 (save-excursion (beginning-of-line)
4055 (looking-at auto-fill-inhibit-regexp))))
4056 nil ;; Auto-filling not required
4057 (if (memq justify '(full center right))
4058 (save-excursion (unjustify-current-line)))
4060 ;; Choose a fill-prefix automatically.
4061 (when (and adaptive-fill-mode
4062 (or (null fill-prefix) (string= fill-prefix "")))
4063 (let ((prefix
4064 (fill-context-prefix
4065 (save-excursion (backward-paragraph 1) (point))
4066 (save-excursion (forward-paragraph 1) (point)))))
4067 (and prefix (not (equal prefix ""))
4068 ;; Use auto-indentation rather than a guessed empty prefix.
4069 (not (and fill-indent-according-to-mode
4071 (setq fill-prefix prefix))))
4073 (while (and (not give-up) (> (current-column) fc))
4074 ;; Determine where to split the line.
4075 (let* (after-prefix
4076 (fill-point
4077 (save-excursion
4078 (beginning-of-line)
4079 (setq after-prefix (point))
4080 (and fill-prefix
4081 (looking-at (regexp-quote fill-prefix))
4082 (setq after-prefix (match-end 0)))
4083 (move-to-column (1+ fc))
4084 (fill-move-to-break-point after-prefix)
4085 (point))))
4087 ;; See whether the place we found is any good.
4088 (if (save-excursion
4089 (goto-char fill-point)
4090 (or (bolp)
4091 ;; There is no use breaking at end of line.
4092 (save-excursion (skip-chars-forward " ") (eolp))
4093 ;; It is futile to split at the end of the prefix
4094 ;; since we would just insert the prefix again.
4095 (and after-prefix (<= (point) after-prefix))
4096 ;; Don't split right after a comment starter
4097 ;; since we would just make another comment starter.
4098 (and comment-start-skip
4099 (let ((limit (point)))
4100 (beginning-of-line)
4101 (and (re-search-forward comment-start-skip
4102 limit t)
4103 (eq (point) limit))))))
4104 ;; No good place to break => stop trying.
4105 (setq give-up t)
4106 ;; Ok, we have a useful place to break the line. Do it.
4107 (let ((prev-column (current-column)))
4108 ;; If point is at the fill-point, do not `save-excursion'.
4109 ;; Otherwise, if a comment prefix or fill-prefix is inserted,
4110 ;; point will end up before it rather than after it.
4111 (if (save-excursion
4113 (= (point) fill-point))
4114 (funcall comment-line-break-function t)
4115 (save-excursion
4116 (goto-char fill-point)
4117 (funcall comment-line-break-function t)))
4118 ;; Now do justification, if required
4119 (if (not (eq justify 'left))
4120 (save-excursion
4121 (end-of-line 0)
4122 (justify-current-line justify nil t)))
4123 ;; If making the new line didn't reduce the hpos of
4124 ;; the end of the line, then give up now;
4125 ;; trying again will not help.
4126 (if (>= (current-column) prev-column)
4127 (setq give-up t))))))
4128 ;; Justify last line.
4129 (justify-current-line justify t t)
4130 t)))
4132 (defvar normal-auto-fill-function 'do-auto-fill
4133 "The function to use for `auto-fill-function' if Auto Fill mode is turned on.
4134 Some major modes set this.")
4136 (put 'auto-fill-function :minor-mode-function 'auto-fill-mode)
4137 ;; FIXME: turn into a proper minor mode.
4138 ;; Add a global minor mode version of it.
4139 (defun auto-fill-mode (&optional arg)
4140 "Toggle Auto Fill mode.
4141 With arg, turn Auto Fill mode on if and only if arg is positive.
4142 In Auto Fill mode, inserting a space at a column beyond `current-fill-column'
4143 automatically breaks the line at a previous space.
4145 The value of `normal-auto-fill-function' specifies the function to use
4146 for `auto-fill-function' when turning Auto Fill mode on."
4147 (interactive "P")
4148 (prog1 (setq auto-fill-function
4149 (if (if (null arg)
4150 (not auto-fill-function)
4151 (> (prefix-numeric-value arg) 0))
4152 normal-auto-fill-function
4153 nil))
4154 (force-mode-line-update)))
4156 ;; This holds a document string used to document auto-fill-mode.
4157 (defun auto-fill-function ()
4158 "Automatically break line at a previous space, in insertion of text."
4159 nil)
4161 (defun turn-on-auto-fill ()
4162 "Unconditionally turn on Auto Fill mode."
4163 (auto-fill-mode 1))
4165 (defun turn-off-auto-fill ()
4166 "Unconditionally turn off Auto Fill mode."
4167 (auto-fill-mode -1))
4169 (custom-add-option 'text-mode-hook 'turn-on-auto-fill)
4171 (defun set-fill-column (arg)
4172 "Set `fill-column' to specified argument.
4175 (interactive "P")
4176 (if (consp arg)
4177 (setq arg (current-column)))
4178 (if (not (integerp arg))
4179 ;; Disallow missing argument; it's probably a typo for C-x C-f.
4180 (error "set-fill-column requires an explicit argument")
4181 (message "Fill column set to %d (was %d)" arg fill-column)
4182 (setq fill-column arg)))
4183 \f
4184 (defun set-selective-display (arg)
4185 "Set `selective-display' to ARG; clear it if no arg.
4186 When the value of `selective-display' is a number > 0,
4187 lines whose indentation is >= that value are not displayed.
4188 The variable `selective-display' has a separate value for each buffer."
4189 (interactive "P")
4190 (if (eq selective-display t)
4191 (error "selective-display already in use for marked lines"))
4192 (let ((current-vpos
4193 (save-restriction
4194 (narrow-to-region (point-min) (point))
4195 (goto-char (window-start))
4196 (vertical-motion (window-height)))))
4197 (setq selective-display
4198 (and arg (prefix-numeric-value arg)))
4199 (recenter current-vpos))
4200 (set-window-start (selected-window) (window-start (selected-window)))
4201 (princ "selective-display set to " t)
4202 (prin1 selective-display t)
4203 (princ "." t))
4205 (defvaralias 'indicate-unused-lines 'indicate-empty-lines)
4206 (defvaralias 'default-indicate-unused-lines 'default-indicate-empty-lines)
4208 (defun toggle-truncate-lines (arg)
4209 "Toggle whether to fold or truncate long lines on the screen.
4210 With arg, truncate long lines iff arg is positive.
4211 Note that in side-by-side windows, truncation is always enabled."
4212 (interactive "P")
4213 (setq truncate-lines
4214 (if (null arg)
4215 (not truncate-lines)
4216 (> (prefix-numeric-value arg) 0)))
4217 (force-mode-line-update)
4218 (unless truncate-lines
4219 (let ((buffer (current-buffer)))
4220 (walk-windows (lambda (window)
4221 (if (eq buffer (window-buffer window))
4222 (set-window-hscroll window 0)))
4223 nil t)))
4224 (message "Truncate long lines %s"
4225 (if truncate-lines "enabled" "disabled")))
4227 (defvar overwrite-mode-textual " Ovwrt"
4228 "The string displayed in the mode line when in overwrite mode.")
4229 (defvar overwrite-mode-binary " Bin Ovwrt"
4230 "The string displayed in the mode line when in binary overwrite mode.")
4232 (defun overwrite-mode (arg)
4233 "Toggle overwrite mode.
4234 With arg, turn overwrite mode on iff arg is positive.
4235 In overwrite mode, printing characters typed in replace existing text
4236 on a one-for-one basis, rather than pushing it to the right. At the
4237 end of a line, such characters extend the line. Before a tab,
4238 such characters insert until the tab is filled in.
4240 is supposed to make it easier to insert characters when necessary."
4241 (interactive "P")
4242 (setq overwrite-mode
4243 (if (if (null arg) (not overwrite-mode)
4244 (> (prefix-numeric-value arg) 0))
4245 'overwrite-mode-textual))
4246 (force-mode-line-update))
4248 (defun binary-overwrite-mode (arg)
4249 "Toggle binary overwrite mode.
4250 With arg, turn binary overwrite mode on iff arg is positive.
4251 In binary overwrite mode, printing characters typed in replace
4252 existing text. Newlines are not treated specially, so typing at the
4253 end of a line joins the line to the next, with the typed character
4254 between them. Typing before a tab character simply replaces the tab
4255 with the character typed.
4257 typing characters do.
4259 Note that binary overwrite mode is not its own minor mode; it is a
4260 specialization of overwrite mode, entered by setting the
4261 `overwrite-mode' variable to `overwrite-mode-binary'."
4262 (interactive "P")
4263 (setq overwrite-mode
4264 (if (if (null arg)
4265 (not (eq overwrite-mode 'overwrite-mode-binary))
4266 (> (prefix-numeric-value arg) 0))
4267 'overwrite-mode-binary))
4268 (force-mode-line-update))
4270 (define-minor-mode line-number-mode
4271 "Toggle Line Number mode.
4272 With arg, turn Line Number mode on iff arg is positive.
4273 When Line Number mode is enabled, the line number appears
4274 in the mode line.
4276 Line numbers do not appear for very large buffers and buffers
4277 with very long lines; see variables `line-number-display-limit'
4278 and `line-number-display-limit-width'."
4279 :init-value t :global t :group 'editing-basics)
4281 (define-minor-mode column-number-mode
4282 "Toggle Column Number mode.
4283 With arg, turn Column Number mode on iff arg is positive.
4284 When Column Number mode is enabled, the column number appears
4285 in the mode line."
4286 :global t :group 'editing-basics)
4288 (define-minor-mode size-indication-mode
4289 "Toggle Size Indication mode.
4290 With arg, turn Size Indication mode on iff arg is positive. When
4291 Size Indication mode is enabled, the size of the accessible part
4292 of the buffer appears in the mode line."
4293 :global t :group 'editing-basics)
4294 \f
4295 (defgroup paren-blinking nil
4296 "Blinking matching of parens and expressions."
4297 :prefix "blink-matching-"
4298 :group 'paren-matching)
4300 (defcustom blink-matching-paren t
4301 "*Non-nil means show matching open-paren when close-paren is inserted."
4302 :type 'boolean
4303 :group 'paren-blinking)
4305 (defcustom blink-matching-paren-on-screen t
4306 "*Non-nil means show matching open-paren when it is on screen.
4307 If nil, means don't show it (but the open-paren can still be shown
4308 when it is off screen).
4310 This variable has no effect if `blink-matching-paren' is nil.
4311 \(In that case, the open-paren is never shown.)
4312 It is also ignored if `show-paren-mode' is enabled."
4313 :type 'boolean
4314 :group 'paren-blinking)
4316 (defcustom blink-matching-paren-distance (* 25 1024)
4317 "*If non-nil, maximum distance to search backwards for matching open-paren.
4318 If nil, search stops at the beginning of the accessible portion of the buffer."
4319 :type '(choice (const nil) integer)
4320 :group 'paren-blinking)
4322 (defcustom blink-matching-delay 1
4323 "*Time in seconds to delay after showing a matching paren."
4324 :type 'number
4325 :group 'paren-blinking)
4327 (defcustom blink-matching-paren-dont-ignore-comments nil
4328 "*Non-nil means `blink-matching-paren' will not ignore comments."
4329 :type 'boolean
4330 :group 'paren-blinking)
4332 (defun blink-matching-open ()
4333 "Move cursor momentarily to the beginning of the sexp before point."
4334 (interactive)
4335 (when (and (> (point) (point-min))
4336 blink-matching-paren
4337 ;; Verify an even number of quoting characters precede the close.
4338 (= 1 (logand 1 (- (point)
4339 (save-excursion
4340 (forward-char -1)
4342 (point))))))
4343 (let* ((oldpos (point))
4344 blinkpos
4345 message-log-max ; Don't log messages about paren matching.
4346 matching-paren
4347 open-paren-line-string)
4348 (save-excursion
4349 (save-restriction
4350 (if blink-matching-paren-distance
4351 (narrow-to-region (max (point-min)
4352 (- (point) blink-matching-paren-distance))
4353 oldpos))
4354 (condition-case ()
4355 (let ((parse-sexp-ignore-comments
4356 (and parse-sexp-ignore-comments
4357 (not blink-matching-paren-dont-ignore-comments))))
4358 (setq blinkpos (scan-sexps oldpos -1)))
4359 (error nil)))
4360 (and blinkpos
4361 ;; Not syntax '$'.
4362 (not (eq (syntax-class (syntax-after blinkpos)) 8))
4363 (setq matching-paren
4364 (let ((syntax (syntax-after blinkpos)))
4365 (and (consp syntax)
4366 (eq (syntax-class syntax) 4)
4367 (cdr syntax)))))
4368 (cond
4369 ((not (or (eq matching-paren (char-before oldpos))
4370 ;; The cdr might hold a new paren-class info rather than
4371 ;; a matching-char info, in which case the two CDRs
4372 ;; should match.
4373 (eq matching-paren (cdr (syntax-after (1- oldpos))))))
4374 (message "Mismatched parentheses"))
4375 ((not blinkpos)
4376 (if (not blink-matching-paren-distance)
4377 (message "Unmatched parenthesis")))
4378 ((pos-visible-in-window-p blinkpos)
4379 ;; Matching open within window, temporarily move to blinkpos but only
4380 ;; if `blink-matching-paren-on-screen' is non-nil.
4381 (and blink-matching-paren-on-screen
4382 (not show-paren-mode)
4383 (save-excursion
4384 (goto-char blinkpos)
4385 (sit-for blink-matching-delay))))
4386 (t
4387 (save-excursion
4388 (goto-char blinkpos)
4389 (setq open-paren-line-string
4390 ;; Show what precedes the open in its line, if anything.
4391 (if (save-excursion
4393 (not (bolp)))
4394 (buffer-substring (line-beginning-position)
4395 (1+ blinkpos))
4396 ;; Show what follows the open in its line, if anything.
4397 (if (save-excursion
4398 (forward-char 1)
4400 (not (eolp)))
4401 (buffer-substring blinkpos
4402 (line-end-position))
4403 ;; Otherwise show the previous nonblank line,
4404 ;; if there is one.
4405 (if (save-excursion
4407 (not (bobp)))
4408 (concat
4409 (buffer-substring (progn
4411 (line-beginning-position))
4412 (progn (end-of-line)
4414 (point)))
4415 ;; Replace the newline and other whitespace with `...'.
4416 "..."
4417 (buffer-substring blinkpos (1+ blinkpos)))
4418 ;; There is nothing to show except the char itself.
4419 (buffer-substring blinkpos (1+ blinkpos)))))))
4420 (message "Matches %s"
4421 (substring-no-properties open-paren-line-string))))))))
4423 ;Turned off because it makes dbx bomb out.
4424 (setq blink-paren-function 'blink-matching-open)
4425 \f
4426 ;; This executes C-g typed while Emacs is waiting for a command.
4427 ;; Quitting out of a program does not go through here;
4428 ;; that happens in the QUIT macro at the C code level.
4429 (defun keyboard-quit ()
4430 "Signal a `quit' condition.
4431 During execution of Lisp code, this character causes a quit directly.
4432 At top-level, as an editor command, this simply beeps."
4433 (interactive)
4434 (deactivate-mark)
4435 (if (fboundp 'kmacro-keyboard-quit)
4436 (kmacro-keyboard-quit))
4437 (setq defining-kbd-macro nil)
4438 (signal 'quit nil))
4440 (defvar buffer-quit-function nil
4443 \(such as cancelling a prefix argument, minibuffer or region) do not apply.")
4445 (defun keyboard-escape-quit ()
4447 This command can exit an interactive command such as `query-replace',
4448 can clear out a prefix argument or a region,
4449 can get out of the minibuffer or other recursive edit,
4450 cancel the use of the current buffer (for special-purpose buffers),
4451 or go back to just one window (by deleting all but the selected window)."
4452 (interactive)
4453 (cond ((eq last-command 'mode-exited) nil)
4454 ((> (minibuffer-depth) 0)
4455 (abort-recursive-edit))
4456 (current-prefix-arg
4457 nil)
4458 ((and transient-mark-mode mark-active)
4459 (deactivate-mark))
4460 ((> (recursion-depth) 0)
4461 (exit-recursive-edit))
4462 (buffer-quit-function
4463 (funcall buffer-quit-function))
4464 ((not (one-window-p t))
4465 (delete-other-windows))
4467 (bury-buffer))))
4469 (defun play-sound-file (file &optional volume device)
4470 "Play sound stored in FILE.
4471 VOLUME and DEVICE correspond to the keywords of the sound
4472 specification for `play-sound'."
4473 (interactive "fPlay sound file: ")
4474 (let ((sound (list :file file)))
4475 (if volume
4476 (plist-put sound :volume volume))
4477 (if device
4478 (plist-put sound :device device))
4479 (push 'sound sound)
4480 (play-sound sound)))
4482 \f
4483 (defcustom read-mail-command 'rmail
4484 "*Your preference for a mail reading package.
4485 This is used by some keybindings which support reading mail.
4486 See also `mail-user-agent' concerning sending mail."
4487 :type '(choice (function-item rmail)
4488 (function-item gnus)
4489 (function-item mh-rmail)
4490 (function :tag "Other"))
4491 :version "21.1"
4492 :group 'mail)
4494 (defcustom mail-user-agent 'sendmail-user-agent
4495 "*Your preference for a mail composition package.
4496 Various Emacs Lisp packages (e.g. Reporter) require you to compose an
4497 outgoing email message. This variable lets you specify which
4498 mail-sending package you prefer.
4500 Valid values include:
4502 `sendmail-user-agent' -- use the default Emacs Mail package.
4503 See Info node `(emacs)Sending Mail'.
4504 `mh-e-user-agent' -- use the Emacs interface to the MH mail system.
4505 See Info node `(mh-e)'.
4506 `message-user-agent' -- use the Gnus Message package.
4507 See Info node `(message)'.
4508 `gnus-user-agent' -- like `message-user-agent', but with Gnus
4509 paraphernalia, particularly the Gcc: header for
4510 archiving.
4512 Additional valid symbols may be available; check with the author of
4513 your package for details. The function should return non-nil if it
4514 succeeds.
4516 See also `read-mail-command' concerning reading mail."
4517 :type '(radio (function-item :tag "Default Emacs mail"
4519 sendmail-user-agent)
4520 (function-item :tag "Emacs interface to MH"
4522 mh-e-user-agent)
4523 (function-item :tag "Gnus Message package"
4525 message-user-agent)
4526 (function-item :tag "Gnus Message with full Gnus features"
4528 gnus-user-agent)
4529 (function :tag "Other"))
4530 :group 'mail)
4532 (define-mail-user-agent 'sendmail-user-agent
4533 'sendmail-user-agent-compose
4534 'mail-send-and-exit)
4536 (defun rfc822-goto-eoh ()
4537 ;; Go to header delimiter line in a mail message, following RFC822 rules
4538 (goto-char (point-min))
4539 (when (re-search-forward
4541 (goto-char (match-beginning 0))))
4543 (defun sendmail-user-agent-compose (&optional to subject other-headers continue
4544 switch-function yank-action
4545 send-actions)
4546 (if switch-function
4547 (let ((special-display-buffer-names nil)
4548 (special-display-regexps nil)
4549 (same-window-buffer-names nil)
4550 (same-window-regexps nil))
4551 (funcall switch-function "*mail*")))
4552 (let ((cc (cdr (assoc-string "cc" other-headers t)))
4553 (in-reply-to (cdr (assoc-string "in-reply-to" other-headers t)))
4554 (body (cdr (assoc-string "body" other-headers t))))
4555 (or (mail continue to subject in-reply-to cc yank-action send-actions)
4556 continue
4557 (error "Message aborted"))
4558 (save-excursion
4559 (rfc822-goto-eoh)
4560 (while other-headers
4561 (unless (member-ignore-case (car (car other-headers))
4562 '("in-reply-to" "cc" "body"))
4563 (insert (car (car other-headers)) ": "
4564 (cdr (car other-headers))
4566 (setq other-headers (cdr other-headers)))
4567 (when body
4568 (forward-line 1)
4569 (insert body))
4570 t)))
4572 (define-mail-user-agent 'mh-e-user-agent
4573 'mh-smail-batch 'mh-send-letter 'mh-fully-kill-draft
4574 'mh-before-send-letter-hook)
4576 (defun compose-mail (&optional to subject other-headers continue
4577 switch-function yank-action send-actions)
4578 "Start composing a mail message to send.
4579 This uses the user's chosen mail composition package
4580 as selected with the variable `mail-user-agent'.
4581 The optional arguments TO and SUBJECT specify recipients
4582 and the initial Subject field, respectively.
4584 OTHER-HEADERS is an alist specifying additional
4585 header fields. Elements look like (HEADER . VALUE) where both
4586 HEADER and VALUE are strings.
4588 CONTINUE, if non-nil, says to continue editing a message already
4589 being composed.
4591 SWITCH-FUNCTION, if non-nil, is a function to use to
4592 switch to and display the buffer used for mail composition.
4594 YANK-ACTION, if non-nil, is an action to perform, if and when necessary,
4595 to insert the raw text of the message being replied to.
4596 It has the form (FUNCTION . ARGS). The user agent will apply
4597 FUNCTION to ARGS, to insert the raw text of the original message.
4598 \(The user agent will also run `mail-citation-hook', *after* the
4599 original text has been inserted in this way.)
4601 SEND-ACTIONS is a list of actions to call when the message is sent.
4602 Each action has the form (FUNCTION . ARGS)."
4603 (interactive
4604 (list nil nil nil current-prefix-arg))
4605 (let ((function (get mail-user-agent 'composefunc)))
4606 (funcall function to subject other-headers continue
4607 switch-function yank-action send-actions)))
4609 (defun compose-mail-other-window (&optional to subject other-headers continue
4610 yank-action send-actions)
4612 (interactive
4613 (list nil nil nil current-prefix-arg))
4614 (compose-mail to subject other-headers continue
4615 'switch-to-buffer-other-window yank-action send-actions))
4618 (defun compose-mail-other-frame (&optional to subject other-headers continue
4619 yank-action send-actions)
4621 (interactive
4622 (list nil nil nil current-prefix-arg))
4623 (compose-mail to subject other-headers continue
4624 'switch-to-buffer-other-frame yank-action send-actions))
4625 \f
4626 (defvar set-variable-value-history nil
4627 "History of values entered with `set-variable'.")
4629 (defun set-variable (variable value &optional make-local)
4630 "Set VARIABLE to VALUE. VALUE is a Lisp object.
4631 VARIABLE should be a user option variable name, a Lisp variable
4632 meant to be customized by users. You should enter VALUE in Lisp syntax,
4633 so if you want VALUE to be a string, you must surround it with doublequotes.
4634 VALUE is used literally, not evaluated.
4636 If VARIABLE has a `variable-interactive' property, that is used as if
4637 it were the arg to `interactive' (which see) to interactively read VALUE.
4639 If VARIABLE has been defined with `defcustom', then the type information
4640 in the definition is used to check that VALUE is valid.
4642 With a prefix argument, set VARIABLE to VALUE buffer-locally."
4643 (interactive
4644 (let* ((default-var (variable-at-point))
4645 (var (if (user-variable-p default-var)
4646 (read-variable (format "Set variable (default %s): " default-var)
4647 default-var)
4648 (read-variable "Set variable: ")))
4649 (minibuffer-help-form '(describe-variable var))
4650 (prop (get var 'variable-interactive))
4651 (obsolete (car (get var 'byte-obsolete-variable)))
4652 (prompt (format "Set %s %s to value: " var
4653 (cond ((local-variable-p var)
4654 "(buffer-local)")
4655 ((or current-prefix-arg
4656 (local-variable-if-set-p var))
4657 "buffer-locally")
4658 (t "globally"))))
4659 (val (progn
4660 (when obsolete
4661 (message (concat "`%S' is obsolete; "
4662 (if (symbolp obsolete) "use `%S' instead" "%s"))
4663 var obsolete)
4664 (sit-for 3))
4665 (if prop
4666 ;; Use VAR's `variable-interactive' property
4667 ;; as an interactive spec for prompting.
4668 (call-interactively `(lambda (arg)
4669 (interactive ,prop)
4670 arg))
4671 (read
4672 (read-string prompt nil
4673 'set-variable-value-history
4674 (format "%S" (symbol-value var))))))))
4675 (list var val current-prefix-arg)))
4677 (and (custom-variable-p variable)
4678 (not (get variable 'custom-type))
4679 (custom-load-symbol variable))
4680 (let ((type (get variable 'custom-type)))
4681 (when type
4682 ;; Match with custom type.
4683 (require 'cus-edit)
4684 (setq type (widget-convert type))
4685 (unless (widget-apply type :match value)
4686 (error "Value `%S' does not match type %S of %S"
4687 value (car type) variable))))
4689 (if make-local
4690 (make-local-variable variable))
4692 (set variable value)
4694 ;; Force a thorough redisplay for the case that the variable
4695 ;; has an effect on the display, like `tab-width' has.
4696 (force-mode-line-update))
4697 \f
4698 ;; Define the major mode for lists of completions.
4700 (defvar completion-list-mode-map nil
4701 "Local map for completion list buffers.")
4702 (or completion-list-mode-map
4703 (let ((map (make-sparse-keymap)))
4704 (define-key map [mouse-2] 'mouse-choose-completion)
4705 (define-key map [follow-link] 'mouse-face)
4706 (define-key map [down-mouse-2] nil)
4707 (define-key map "\C-m" 'choose-completion)
4708 (define-key map "\e\e\e" 'delete-completion-window)
4709 (define-key map [left] 'previous-completion)
4710 (define-key map [right] 'next-completion)
4711 (setq completion-list-mode-map map)))
4713 ;; Completion mode is suitable only for specially formatted data.
4714 (put 'completion-list-mode 'mode-class 'special)
4716 (defvar completion-reference-buffer nil
4717 "Record the buffer that was current when the completion list was requested.
4718 This is a local variable in the completion list buffer.
4719 Initial value is nil to avoid some compiler warnings.")
4721 (defvar completion-no-auto-exit nil
4722 "Non-nil means `choose-completion-string' should never exit the minibuffer.
4723 This also applies to other functions such as `choose-completion'
4724 and `mouse-choose-completion'.")
4726 (defvar completion-base-size nil
4727 "Number of chars at beginning of minibuffer not involved in completion.
4728 This is a local variable in the completion list buffer
4729 but it talks about the buffer in `completion-reference-buffer'.
4730 If this is nil, it means to compare text to determine which part
4731 of the tail end of the buffer's text is involved in completion.")
4733 (defun delete-completion-window ()
4734 "Delete the completion list window.
4735 Go to the window from which completion was requested."
4736 (interactive)
4737 (let ((buf completion-reference-buffer))
4738 (if (one-window-p t)
4739 (if (window-dedicated-p (selected-window))
4740 (delete-frame (selected-frame)))
4741 (delete-window (selected-window))
4742 (if (get-buffer-window buf)
4743 (select-window (get-buffer-window buf))))))
4745 (defun previous-completion (n)
4746 "Move to the previous item in the completion list."
4747 (interactive "p")
4748 (next-completion (- n)))
4750 (defun next-completion (n)
4751 "Move to the next item in the completion list.
4752 With prefix argument N, move N items (negative N means move backward)."
4753 (interactive "p")
4754 (let ((beg (point-min)) (end (point-max)))
4755 (while (and (> n 0) (not (eobp)))
4756 ;; If in a completion, move to the end of it.
4757 (when (get-text-property (point) 'mouse-face)
4758 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
4759 ;; Move to start of next one.
4760 (unless (get-text-property (point) 'mouse-face)
4761 (goto-char (next-single-property-change (point) 'mouse-face nil end)))
4762 (setq n (1- n)))
4763 (while (and (< n 0) (not (bobp)))
4764 (let ((prop (get-text-property (1- (point)) 'mouse-face)))
4765 ;; If in a completion, move to the start of it.
4766 (when (and prop (eq prop (get-text-property (point) 'mouse-face)))
4767 (goto-char (previous-single-property-change
4768 (point) 'mouse-face nil beg)))
4769 ;; Move to end of the previous completion.
4770 (unless (or (bobp) (get-text-property (1- (point)) 'mouse-face))
4771 (goto-char (previous-single-property-change
4772 (point) 'mouse-face nil beg)))
4773 ;; Move to the start of that one.
4774 (goto-char (previous-single-property-change
4775 (point) 'mouse-face nil beg))
4776 (setq n (1+ n))))))
4778 (defun choose-completion ()
4779 "Choose the completion that point is in or next to."
4780 (interactive)
4781 (let (beg end completion (buffer completion-reference-buffer)
4782 (base-size completion-base-size))
4783 (if (and (not (eobp)) (get-text-property (point) 'mouse-face))
4784 (setq end (point) beg (1+ (point))))
4785 (if (and (not (bobp)) (get-text-property (1- (point)) 'mouse-face))
4786 (setq end (1- (point)) beg (point)))
4787 (if (null beg)
4788 (error "No completion here"))
4789 (setq beg (previous-single-property-change beg 'mouse-face))
4790 (setq end (or (next-single-property-change end 'mouse-face) (point-max)))
4791 (setq completion (buffer-substring-no-properties beg end))
4792 (let ((owindow (selected-window)))
4793 (if (and (one-window-p t 'selected-frame)
4794 (window-dedicated-p (selected-window)))
4795 ;; This is a special buffer's frame
4796 (iconify-frame (selected-frame))
4797 (or (window-dedicated-p (selected-window))
4798 (bury-buffer)))
4799 (select-window owindow))
4800 (choose-completion-string completion buffer base-size)))
4802 ;; Delete the longest partial match for STRING
4803 ;; that can be found before POINT.
4804 (defun choose-completion-delete-max-match (string)
4805 (let ((opoint (point))
4806 len)
4807 ;; Try moving back by the length of the string.
4808 (goto-char (max (- (point) (length string))
4809 (minibuffer-prompt-end)))
4810 ;; See how far back we were actually able to move. That is the
4811 ;; upper bound on how much we can match and delete.
4812 (setq len (- opoint (point)))
4813 (if completion-ignore-case
4814 (setq string (downcase string)))
4815 (while (and (> len 0)
4816 (let ((tail (buffer-substring (point) opoint)))
4817 (if completion-ignore-case
4818 (setq tail (downcase tail)))
4819 (not (string= tail (substring string 0 len)))))
4820 (setq len (1- len))
4821 (forward-char 1))
4822 (delete-char len)))
4824 (defvar choose-completion-string-functions nil
4825 "Functions that may override the normal insertion of a completion choice.
4826 These functions are called in order with four arguments:
4827 CHOICE - the string to insert in the buffer,
4828 BUFFER - the buffer in which the choice should be inserted,
4829 MINI-P - non-nil iff BUFFER is a minibuffer, and
4830 BASE-SIZE - the number of characters in BUFFER before
4831 the string being completed.
4833 If a function in the list returns non-nil, that function is supposed
4834 to have inserted the CHOICE in the BUFFER, and possibly exited
4835 the minibuffer; no further functions will be called.
4837 If all functions in the list return nil, that means to use
4838 the default method of inserting the completion in BUFFER.")
4840 (defun choose-completion-string (choice &optional buffer base-size)
4841 "Switch to BUFFER and insert the completion choice CHOICE.
4842 BASE-SIZE, if non-nil, says how many characters of BUFFER's text
4843 to keep. If it is nil, we call `choose-completion-delete-max-match'
4844 to decide what to delete."
4846 ;; If BUFFER is the minibuffer, exit the minibuffer
4847 ;; unless it is reading a file name and CHOICE is a directory,
4848 ;; or completion-no-auto-exit is non-nil.
4850 (let* ((buffer (or buffer completion-reference-buffer))
4851 (mini-p (minibufferp buffer)))
4852 ;; If BUFFER is a minibuffer, barf unless it's the currently
4853 ;; active minibuffer.
4854 (if (and mini-p
4855 (or (not (active-minibuffer-window))
4856 (not (equal buffer
4857 (window-buffer (active-minibuffer-window))))))
4858 (error "Minibuffer is not active for completion")
4859 ;; Set buffer so buffer-local choose-completion-string-functions works.
4860 (set-buffer buffer)
4861 (unless (run-hook-with-args-until-success
4862 'choose-completion-string-functions
4863 choice buffer mini-p base-size)
4864 ;; Insert the completion into the buffer where it was requested.
4865 (if base-size
4866 (delete-region (+ base-size (if mini-p
4867 (minibuffer-prompt-end)
4868 (point-min)))
4869 (point))
4870 (choose-completion-delete-max-match choice))
4871 (insert choice)
4872 (remove-text-properties (- (point) (length choice)) (point)
4873 '(mouse-face nil))
4874 ;; Update point in the window that BUFFER is showing in.
4875 (let ((window (get-buffer-window buffer t)))
4876 (set-window-point window (point)))
4877 ;; If completing for the minibuffer, exit it with this choice.
4878 (and (not completion-no-auto-exit)
4879 (equal buffer (window-buffer (minibuffer-window)))
4880 minibuffer-completion-table
4881 ;; If this is reading a file name, and the file name chosen
4882 ;; is a directory, don't exit the minibuffer.
4883 (if (and (eq minibuffer-completion-table 'read-file-name-internal)
4884 (file-directory-p (field-string (point-max))))
4885 (let ((mini (active-minibuffer-window)))
4886 (select-window mini)
4887 (when minibuffer-auto-raise
4888 (raise-frame (window-frame mini))))
4889 (exit-minibuffer)))))))
4891 (defun completion-list-mode ()
4892 "Major mode for buffers showing lists of possible completions.
4894 to select the completion near point.
4896 with the mouse."
4897 (interactive)
4898 (kill-all-local-variables)
4899 (use-local-map completion-list-mode-map)
4900 (setq mode-name "Completion List")
4901 (setq major-mode 'completion-list-mode)
4902 (make-local-variable 'completion-base-size)
4903 (setq completion-base-size nil)
4904 (run-mode-hooks 'completion-list-mode-hook))
4906 (defun completion-list-mode-finish ()
4907 "Finish setup of the completions buffer.
4908 Called from `temp-buffer-show-hook'."
4909 (when (eq major-mode 'completion-list-mode)
4910 (toggle-read-only 1)))
4912 (add-hook 'temp-buffer-show-hook 'completion-list-mode-finish)
4914 (defvar completion-setup-hook nil
4915 "Normal hook run at the end of setting up a completion list buffer.
4916 When this hook is run, the current buffer is the one in which the
4917 command to display the completion list buffer was run.
4918 The completion list buffer is available as the value of `standard-output'.
4919 The common prefix substring for completion may be available as the
4920 value of `completion-common-substring'. See also `display-completion-list'.")
4923 ;; Variables and faces used in `completion-setup-function'.
4925 (defface completions-first-difference
4926 '((t (:inherit bold)))
4927 "Face put on the first uncommon character in completions in *Completions* buffer."
4928 :group 'completion)
4930 (defface completions-common-part
4931 '((t (:inherit default)))
4932 "Face put on the common prefix substring in completions in *Completions* buffer.
4933 The idea of `completions-common-part' is that you can use it to
4934 make the common parts less visible than normal, so that the rest
4935 of the differing parts is, by contrast, slightly highlighted."
4936 :group 'completion)
4938 ;; This is for packages that need to bind it to a non-default regexp
4939 ;; in order to make the first-differing character highlight work
4940 ;; to their liking
4941 (defvar completion-root-regexp "^/"
4942 "Regexp to use in `completion-setup-function' to find the root directory.")
4944 (defvar completion-common-substring nil
4945 "Common prefix substring to use in `completion-setup-function' to put faces.
4946 The value is set by `display-completion-list' during running `completion-setup-hook'.
4948 To put faces `completions-first-difference' and `completions-common-part'
4949 in the `*Completions*' buffer, the common prefix substring in completions
4950 is needed as a hint. (The minibuffer is a special case. The content
4951 of the minibuffer before point is always the common substring.)")
4953 ;; This function goes in completion-setup-hook, so that it is called
4954 ;; after the text of the completion list buffer is written.
4955 (defun completion-setup-function ()
4956 (let* ((mainbuf (current-buffer))
4957 (mbuf-contents (minibuffer-completion-contents))
4958 common-string-length)
4959 ;; When reading a file name in the minibuffer,
4960 ;; set default-directory in the minibuffer
4961 ;; so it will get copied into the completion list buffer.
4962 (if minibuffer-completing-file-name
4963 (with-current-buffer mainbuf
4964 (setq default-directory (file-name-directory mbuf-contents))))
4965 (with-current-buffer standard-output
4966 (completion-list-mode)
4967 (set (make-local-variable 'completion-reference-buffer) mainbuf)
4968 (setq completion-base-size
4969 (cond
4970 ((and (symbolp minibuffer-completion-table)
4971 (get minibuffer-completion-table 'completion-base-size-function))
4972 ;; To compute base size, a function can use the global value of
4973 ;; completion-common-substring or minibuffer-completion-contents.
4974 (with-current-buffer mainbuf
4975 (funcall (get minibuffer-completion-table
4976 'completion-base-size-function))))
4977 (minibuffer-completing-file-name
4978 ;; For file name completion, use the number of chars before
4979 ;; the start of the file name component at point.
4980 (with-current-buffer mainbuf
4981 (save-excursion
4982 (skip-chars-backward completion-root-regexp)
4983 (- (point) (minibuffer-prompt-end)))))
4984 ;; Otherwise, in minibuffer, the base size is 0.
4985 ((minibufferp mainbuf) 0)))
4986 (setq common-string-length
4987 (cond
4988 (completion-common-substring
4989 (length completion-common-substring))
4990 (completion-base-size
4991 (- (length mbuf-contents) completion-base-size))))
4992 ;; Put faces on first uncommon characters and common parts.
4993 (when (and (integerp common-string-length) (>= common-string-length 0))
4994 (let ((element-start (point-min))
4995 (maxp (point-max))
4996 element-common-end)
4997 (while (and (setq element-start
4998 (next-single-property-change
4999 element-start 'mouse-face))
5000 (< (setq element-common-end
5001 (+ element-start common-string-length))
5002 maxp))
5003 (when (get-char-property element-start 'mouse-face)
5004 (if (and (> common-string-length 0)
5005 (get-char-property (1- element-common-end) 'mouse-face))
5006 (put-text-property element-start element-common-end
5007 'font-lock-face 'completions-common-part))
5008 (if (get-char-property element-common-end 'mouse-face)
5009 (put-text-property element-common-end (1+ element-common-end)
5010 'font-lock-face 'completions-first-difference))))))
5011 ;; Insert help string.
5012 (goto-char (point-min))
5013 (if (display-mouse-p)
5014 (insert (substitute-command-keys
5016 (insert (substitute-command-keys
5020 (add-hook 'completion-setup-hook 'completion-setup-function)
5022 (define-key minibuffer-local-completion-map [prior] 'switch-to-completions)
5023 (define-key minibuffer-local-completion-map "\M-v" 'switch-to-completions)
5025 (defun switch-to-completions ()
5026 "Select the completion list window."
5027 (interactive)
5028 ;; Make sure we have a completions window.
5029 (or (get-buffer-window "*Completions*")
5030 (minibuffer-completion-help))
5031 (let ((window (get-buffer-window "*Completions*")))
5032 (when window
5033 (select-window window)
5034 (goto-char (point-min))
5036 (forward-line 1))))
5038 ;; Support keyboard commands to turn on various modifiers.
5040 ;; These functions -- which are not commands -- each add one modifier
5041 ;; to the following event.
5043 (defun event-apply-alt-modifier (ignore-prompt)
5046 (vector (event-apply-modifier (read-event) 'alt 22 "A-")))
5047 (defun event-apply-super-modifier (ignore-prompt)
5050 (vector (event-apply-modifier (read-event) 'super 23 "s-")))
5051 (defun event-apply-hyper-modifier (ignore-prompt)
5054 (vector (event-apply-modifier (read-event) 'hyper 24 "H-")))
5055 (defun event-apply-shift-modifier (ignore-prompt)
5058 (vector (event-apply-modifier (read-event) 'shift 25 "S-")))
5059 (defun event-apply-control-modifier (ignore-prompt)
5062 (vector (event-apply-modifier (read-event) 'control 26 "C-")))
5063 (defun event-apply-meta-modifier (ignore-prompt)
5066 (vector (event-apply-modifier (read-event) 'meta 27 "M-")))
5068 (defun event-apply-modifier (event symbol lshiftby prefix)
5069 "Apply a modifier flag to event EVENT.
5070 SYMBOL is the name of this modifier, as a symbol.
5071 LSHIFTBY is the numeric value of this modifier, in keyboard events.
5072 PREFIX is the string that represents this modifier in an event type symbol."
5073 (if (numberp event)
5074 (cond ((eq symbol 'control)
5075 (if (and (<= (downcase event) ?z)
5076 (>= (downcase event) ?a))
5077 (- (downcase event) ?a -1)
5078 (if (and (<= (downcase event) ?Z)
5079 (>= (downcase event) ?A))
5080 (- (downcase event) ?A -1)
5081 (logior (lsh 1 lshiftby) event))))
5082 ((eq symbol 'shift)
5083 (if (and (<= (downcase event) ?z)
5084 (>= (downcase event) ?a))
5085 (upcase event)
5086 (logior (lsh 1 lshiftby) event)))
5087 (t
5088 (logior (lsh 1 lshiftby) event)))
5089 (if (memq symbol (event-modifiers event))
5090 event
5091 (let ((event-type (if (symbolp event) event (car event))))
5092 (setq event-type (intern (concat prefix (symbol-name event-type))))
5093 (if (symbolp event)
5094 event-type
5095 (cons event-type (cdr event)))))))
5097 (define-key function-key-map [?\C-x ?@ ?h] 'event-apply-hyper-modifier)
5098 (define-key function-key-map [?\C-x ?@ ?s] 'event-apply-super-modifier)
5099 (define-key function-key-map [?\C-x ?@ ?m] 'event-apply-meta-modifier)
5100 (define-key function-key-map [?\C-x ?@ ?a] 'event-apply-alt-modifier)
5101 (define-key function-key-map [?\C-x ?@ ?S] 'event-apply-shift-modifier)
5102 (define-key function-key-map [?\C-x ?@ ?c] 'event-apply-control-modifier)
5104 ;;;; Keypad support.
5106 ;;; Make the keypad keys act like ordinary typing keys. If people add
5107 ;;; bindings for the function key symbols, then those bindings will
5108 ;;; override these, so this shouldn't interfere with any existing
5109 ;;; bindings.
5111 ;; Also tell read-char how to handle these keys.
5112 (mapc
5113 (lambda (keypad-normal)
5114 (let ((keypad (nth 0 keypad-normal))
5115 (normal (nth 1 keypad-normal)))
5116 (put keypad 'ascii-character normal)
5117 (define-key function-key-map (vector keypad) (vector normal))))
5118 '((kp-0 ?0) (kp-1 ?1) (kp-2 ?2) (kp-3 ?3) (kp-4 ?4)
5119 (kp-5 ?5) (kp-6 ?6) (kp-7 ?7) (kp-8 ?8) (kp-9 ?9)
5120 (kp-space ?\s)
5123 (kp-multiply ?*)
5124 (kp-add ?+)
5125 (kp-separator ?,)
5126 (kp-subtract ?-)
5127 (kp-decimal ?.)
5128 (kp-divide ?/)
5129 (kp-equal ?=)))
5130 \f
5131 ;;;;
5132 ;;;; forking a twin copy of a buffer.
5133 ;;;;
5135 (defvar clone-buffer-hook nil
5136 "Normal hook to run in the new buffer at the end of `clone-buffer'.")
5138 (defun clone-process (process &optional newname)
5139 "Create a twin copy of PROCESS.
5140 If NEWNAME is nil, it defaults to PROCESS' name;
5141 NEWNAME is modified by adding or incrementing <N> at the end as necessary.
5142 If PROCESS is associated with a buffer, the new process will be associated
5143 with the current buffer instead.
5144 Returns nil if PROCESS has already terminated."
5145 (setq newname (or newname (process-name process)))
5147 (setq newname (substring newname 0 (match-beginning 0))))
5148 (when (memq (process-status process) '(run stop open))
5149 (let* ((process-connection-type (process-tty-name process))
5150 (new-process
5151 (if (memq (process-status process) '(open))
5152 (let ((args (process-contact process t)))
5153 (setq args (plist-put args :name newname))
5154 (setq args (plist-put args :buffer
5155 (if (process-buffer process)
5156 (current-buffer))))
5157 (apply 'make-network-process args))
5158 (apply 'start-process newname
5159 (if (process-buffer process) (current-buffer))
5160 (process-command process)))))
5161 (set-process-query-on-exit-flag
5162 new-process (process-query-on-exit-flag process))
5163 (set-process-inherit-coding-system-flag
5164 new-process (process-inherit-coding-system-flag process))
5165 (set-process-filter new-process (process-filter process))
5166 (set-process-sentinel new-process (process-sentinel process))
5167 (set-process-plist new-process (copy-sequence (process-plist process)))
5168 new-process)))
5170 ;; things to maybe add (currently partly covered by `funcall mode'):
5171 ;; - syntax-table
5172 ;; - overlays
5173 (defun clone-buffer (&optional newname display-flag)
5174 "Create and return a twin copy of the current buffer.
5175 Unlike an indirect buffer, the new buffer can be edited
5176 independently of the old one (if it is not read-only).
5177 NEWNAME is the name of the new buffer. It may be modified by
5178 adding or incrementing <N> at the end as necessary to create a
5179 unique buffer name. If nil, it defaults to the name of the
5180 current buffer, with the proper suffix. If DISPLAY-FLAG is
5181 non-nil, the new buffer is shown with `pop-to-buffer'. Trying to
5182 clone a file-visiting buffer, or a buffer whose major mode symbol
5183 has a non-nil `no-clone' property, results in an error.
5185 Interactively, DISPLAY-FLAG is t and NEWNAME is the name of the
5186 current buffer with appropriate suffix. However, if a prefix
5187 argument is given, then the command prompts for NEWNAME in the
5188 minibuffer.
5190 This runs the normal hook `clone-buffer-hook' in the new buffer
5191 after it has been set up properly in other respects."
5192 (interactive
5193 (progn
5194 (if buffer-file-name
5195 (error "Cannot clone a file-visiting buffer"))
5196 (if (get major-mode 'no-clone)
5197 (error "Cannot clone a buffer in %s mode" mode-name))
5198 (list (if current-prefix-arg (read-string "Name: "))
5199 t)))
5200 (if buffer-file-name
5201 (error "Cannot clone a file-visiting buffer"))
5202 (if (get major-mode 'no-clone)
5203 (error "Cannot clone a buffer in %s mode" mode-name))
5204 (setq newname (or newname (buffer-name)))
5206 (setq newname (substring newname 0 (match-beginning 0))))
5207 (let ((buf (current-buffer))
5208 (ptmin (point-min))
5209 (ptmax (point-max))
5210 (pt (point))
5211 (mk (if mark-active (mark t)))
5212 (modified (buffer-modified-p))
5213 (mode major-mode)
5214 (lvars (buffer-local-variables))
5215 (process (get-buffer-process (current-buffer)))
5216 (new (generate-new-buffer (or newname (buffer-name)))))
5217 (save-restriction
5218 (widen)
5219 (with-current-buffer new
5220 (insert-buffer-substring buf)))
5221 (with-current-buffer new
5222 (narrow-to-region ptmin ptmax)
5223 (goto-char pt)
5224 (if mk (set-mark mk))
5225 (set-buffer-modified-p modified)
5227 ;; Clone the old buffer's process, if any.
5228 (when process (clone-process process))
5230 ;; Now set up the major mode.
5231 (funcall mode)
5233 ;; Set up other local variables.
5234 (mapcar (lambda (v)
5235 (condition-case () ;in case var is read-only
5236 (if (symbolp v)
5237 (makunbound v)
5238 (set (make-local-variable (car v)) (cdr v)))
5239 (error nil)))
5240 lvars)
5242 ;; Run any hooks (typically set up by the major mode
5243 ;; for cloning to work properly).
5244 (run-hooks 'clone-buffer-hook))
5245 (if display-flag (pop-to-buffer new))
5246 new))
5249 (defun clone-indirect-buffer (newname display-flag &optional norecord)
5250 "Create an indirect buffer that is a twin copy of the current buffer.
5252 Give the indirect buffer name NEWNAME. Interactively, read NEWNAME
5253 from the minibuffer when invoked with a prefix arg. If NEWNAME is nil
5254 or if not called with a prefix arg, NEWNAME defaults to the current
5255 buffer's name. The name is modified by adding a `<N>' suffix to it
5256 or by incrementing the N in an existing suffix.
5258 DISPLAY-FLAG non-nil means show the new buffer with `pop-to-buffer'.
5259 This is always done when called interactively.
5261 Optional third arg NORECORD non-nil means do not put this buffer at the
5262 front of the list of recently selected ones."
5263 (interactive
5264 (progn
5265 (if (get major-mode 'no-clone-indirect)
5266 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
5267 (list (if current-prefix-arg
5268 (read-string "BName of indirect buffer: "))
5269 t)))
5270 (if (get major-mode 'no-clone-indirect)
5271 (error "Cannot indirectly clone a buffer in %s mode" mode-name))
5272 (setq newname (or newname (buffer-name)))
5274 (setq newname (substring newname 0 (match-beginning 0))))
5275 (let* ((name (generate-new-buffer-name newname))
5276 (buffer (make-indirect-buffer (current-buffer) name t)))
5277 (when display-flag
5278 (pop-to-buffer buffer norecord))
5279 buffer))
5282 (defun clone-indirect-buffer-other-window (buffer &optional norecord)
5283 "Create an indirect buffer that is a twin copy of BUFFER.
5284 Select the new buffer in another window.
5285 Optional second arg NORECORD non-nil means do not put this buffer at
5286 the front of the list of recently selected ones."
5287 (interactive "bClone buffer in other window: ")
5288 (let ((pop-up-windows t))
5289 (set-buffer buffer)
5290 (clone-indirect-buffer nil t norecord)))
5292 \f
5293 ;;; Handling of Backspace and Delete keys.
5295 (defcustom normal-erase-is-backspace
5296 (and (not noninteractive)
5297 (or (memq system-type '(ms-dos windows-nt))
5298 (eq window-system 'mac)
5299 (and (memq window-system '(x))
5300 (fboundp 'x-backspace-delete-keys-p)
5301 (x-backspace-delete-keys-p))
5302 ;; If the terminal Emacs is running on has erase char
5303 ;; set to ^H, use the Backspace key for deleting
5304 ;; backward and, and the Delete key for deleting forward.
5305 (and (null window-system)
5306 (eq tty-erase-char ?\^H))))
5307 "If non-nil, Delete key deletes forward and Backspace key deletes backward.
5309 On window systems, the default value of this option is chosen
5310 according to the keyboard used. If the keyboard has both a Backspace
5311 key and a Delete key, and both are mapped to their usual meanings, the
5312 option's default value is set to t, so that Backspace can be used to
5313 delete backward, and Delete can be used to delete forward.
5315 If not running under a window system, customizing this option accomplishes
5316 a similar effect by mapping C-h, which is usually generated by the
5317 Backspace key, to DEL, and by mapping DEL to C-d via
5318 `keyboard-translate'. The former functionality of C-h is available on
5319 the F1 key. You should probably not use this setting if you don't
5320 have both Backspace, Delete and F1 keys.
5322 Setting this variable with setq doesn't take effect. Programmatically,
5323 call `normal-erase-is-backspace-mode' (which see) instead."
5324 :type 'boolean
5325 :group 'editing-basics
5326 :version "21.1"
5327 :set (lambda (symbol value)
5328 ;; The fboundp is because of a problem with :set when
5329 ;; dumping Emacs. It doesn't really matter.
5330 (if (fboundp 'normal-erase-is-backspace-mode)
5331 (normal-erase-is-backspace-mode (or value 0))
5332 (set-default symbol value))))
5335 (defun normal-erase-is-backspace-mode (&optional arg)
5336 "Toggle the Erase and Delete mode of the Backspace and Delete keys.
5338 With numeric arg, turn the mode on if and only if ARG is positive.
5340 On window systems, when this mode is on, Delete is mapped to C-d and
5341 Backspace is mapped to DEL; when this mode is off, both Delete and
5342 Backspace are mapped to DEL. (The remapping goes via
5343 `function-key-map', so binding Delete or Backspace in the global or
5344 local keymap will override that.)
5346 In addition, on window systems, the bindings of C-Delete, M-Delete,
5347 C-M-Delete, C-Backspace, M-Backspace, and C-M-Backspace are changed in
5348 the global keymap in accordance with the functionality of Delete and
5349 Backspace. For example, if Delete is remapped to C-d, which deletes
5350 forward, C-Delete is bound to `kill-word', but if Delete is remapped
5351 to DEL, which deletes backward, C-Delete is bound to
5352 `backward-kill-word'.
5354 If not running on a window system, a similar effect is accomplished by
5355 remapping C-h (normally produced by the Backspace key) and DEL via
5356 `keyboard-translate': if this mode is on, C-h is mapped to DEL and DEL
5357 to C-d; if it's off, the keys are not remapped.
5359 When not running on a window system, and this mode is turned on, the
5360 former functionality of C-h is available on the F1 key. You should
5361 probably not turn on this mode on a text-only terminal if you don't
5362 have both Backspace, Delete and F1 keys.
5364 See also `normal-erase-is-backspace'."
5365 (interactive "P")
5366 (setq normal-erase-is-backspace
5367 (if arg
5368 (> (prefix-numeric-value arg) 0)
5369 (not normal-erase-is-backspace)))
5371 (cond ((or (memq window-system '(x w32 mac pc))
5372 (memq system-type '(ms-dos windows-nt)))
5373 (let ((bindings
5374 `(([C-delete] [C-backspace])
5375 ([M-delete] [M-backspace])
5376 ([C-M-delete] [C-M-backspace])
5377 (,esc-map
5378 [C-delete] [C-backspace])))
5379 (old-state (lookup-key function-key-map [delete])))
5381 (if normal-erase-is-backspace
5382 (progn
5383 (define-key function-key-map [delete] [?\C-d])
5384 (define-key function-key-map [kp-delete] [?\C-d])
5385 (define-key function-key-map [backspace] [?\C-?]))
5386 (define-key function-key-map [delete] [?\C-?])
5387 (define-key function-key-map [kp-delete] [?\C-?])
5388 (define-key function-key-map [backspace] [?\C-?]))
5390 ;; Maybe swap bindings of C-delete and C-backspace, etc.
5391 (unless (equal old-state (lookup-key function-key-map [delete]))
5392 (dolist (binding bindings)
5393 (let ((map global-map))
5394 (when (keymapp (car binding))
5395 (setq map (car binding) binding (cdr binding)))
5396 (let* ((key1 (nth 0 binding))
5397 (key2 (nth 1 binding))
5398 (binding1 (lookup-key map key1))
5399 (binding2 (lookup-key map key2)))
5400 (define-key map key1 binding2)
5401 (define-key map key2 binding1)))))))
5402 (t
5403 (if normal-erase-is-backspace
5404 (progn
5405 (keyboard-translate ?\C-h ?\C-?)
5406 (keyboard-translate ?\C-? ?\C-d))
5407 (keyboard-translate ?\C-h ?\C-h)
5408 (keyboard-translate ?\C-? ?\C-?))))
5410 (run-hooks 'normal-erase-is-backspace-hook)
5411 (if (interactive-p)
5412 (message "Delete key deletes %s"
5413 (if normal-erase-is-backspace "forward" "backward"))))
5414 \f
5415 (defvar vis-mode-saved-buffer-invisibility-spec nil
5416 "Saved value of `buffer-invisibility-spec' when Visible mode is on.")
5418 (define-minor-mode visible-mode
5419 "Toggle Visible mode.
5420 With argument ARG turn Visible mode on iff ARG is positive.
5422 Enabling Visible mode makes all invisible text temporarily visible.
5423 Disabling Visible mode turns off that effect. Visible mode
5424 works by saving the value of `buffer-invisibility-spec' and setting it to nil."
5425 :lighter " Vis"
5426 :group 'editing-basics
5427 (when (local-variable-p 'vis-mode-saved-buffer-invisibility-spec)
5428 (setq buffer-invisibility-spec vis-mode-saved-buffer-invisibility-spec)
5429 (kill-local-variable 'vis-mode-saved-buffer-invisibility-spec))
5430 (when visible-mode
5431 (set (make-local-variable 'vis-mode-saved-buffer-invisibility-spec)
5432 buffer-invisibility-spec)
5433 (setq buffer-invisibility-spec nil)))
5434 \f
5435 ;; Minibuffer prompt stuff.
5437 ;(defun minibuffer-prompt-modification (start end)
5438 ; (error "You cannot modify the prompt"))
5439 ;
5440 ;
5441 ;(defun minibuffer-prompt-insertion (start end)
5442 ; (let ((inhibit-modification-hooks t))
5443 ; (delete-region start end)
5444 ; ;; Discard undo information for the text insertion itself
5445 ; ;; and for the text deletion.above.
5446 ; (when (consp buffer-undo-list)
5447 ; (setq buffer-undo-list (cddr buffer-undo-list)))
5448 ; (message "You cannot modify the prompt")))
5449 ;
5450 ;
5451 ;(setq minibuffer-prompt-properties
5452 ; (list 'modification-hooks '(minibuffer-prompt-modification)
5453 ; 'insert-in-front-hooks '(minibuffer-prompt-insertion)))
5454 ;
5456 (provide 'simple)
5458 ;; arch-tag: 24af67c0-2a49-44f6-b3b1-312d8b570dfd
5459 ;;; simple.el ends here