| blob | 418d7c17dc2d3f4f400e28cda97a9eb4067dde09 |
1 ;;; fill.el --- fill commands for Emacs -*- coding: iso-2022-7bit -*-
3 ;; Copyright (C) 1985, 1986, 1992, 1994, 1995, 1996, 1997, 1999, 2001, 2002,
4 ;; 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
6 ;; Maintainer: FSF
7 ;; Keywords: wp
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 3, 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 ;; All the commands for filling text. These are documented in the Emacs
29 ;; manual.
31 ;;; Code:
34 "Indenting and filling text."
39 "*Controls criterion for a new paragraph in `fill-individual-paragraphs'.
40 Non-nil means changing indent doesn't end a paragraph.
41 That mode can handle paragraphs with extra indentation on the first line,
42 but it requires separator lines between paragraphs.
43 A value of nil means that any change in indentation starts a new paragraph."
48 "*Non-nil means put two spaces after a colon when filling."
51 ;;;###autoload(put 'colon-double-space 'safe-local-variable 'booleanp)
54 "Mode-specific function to fill a paragraph, or nil if there is none.
55 If the function returns nil, then `fill-paragraph' does its normal work.
63 Kinsoku processing is designed to prevent certain characters from being
64 placed at the beginning or end of a line by filling.
65 See the documentation of `kinsoku' for more information."
70 "Set the fill prefix to the current line up to point.
71 Filling expects lines to start with the fill prefix and
72 reinserts the fill prefix in each resulting line."
86 "*Non-nil means determine a paragraph's fill prefix from its text."
91 ;; Added `!' for doxygen comments starting with `//!' or `/*!'.
92 ;; Added `%' for TeX comments.
93 ;; RMS: deleted the code to match `1.' and `(1)'.
95 "*Regexp to match text at start of line that constitutes indentation.
96 If Adaptive Fill mode is enabled, a prefix matching this pattern
97 on the first and second lines of a paragraph is used as the
98 standard indentation for the whole paragraph.
100 If the paragraph has just one line, the indentation is taken from that
101 line, but in that case `adaptive-fill-first-line-regexp' also plays
102 a role."
107 "*Regexp specifying whether to set fill prefix from a one-line paragraph.
108 When a paragraph has just one line, then after `adaptive-fill-regexp'
109 finds the prefix at the beginning of the line, if it doesn't
110 match this regexp, it is replaced with whitespace.
112 By default, this regexp matches sequences of just spaces and tabs.
114 However, we never use a prefix from a one-line paragraph
115 if it would act as a paragraph-starter on the second line."
120 "Function to call to choose a fill prefix for a paragraph, or nil.
121 A nil value means the function has not determined the fill prefix."
129 "Return the fill-column to use for this line.
130 The fill-column to use for a buffer is stored in the variable `fill-column',
131 but can be locally modified by the `right-margin' text property, which is
132 subtracted from `fill-column'.
134 The fill column to use for a line is the first column at which the column
135 number equals or exceeds the local fill-column - right-margin difference."
141 margin fill-col change col)
142 ;; Look separately at each region of line with a different
143 ;; right-margin.
152 here-col col))
156 "Remove extra spaces between words in region.
157 Leave one space between words, two at end of sentences or after colons
158 \(depending on values of `sentence-end-double-space', `colon-double-space',
159 and `sentence-end-without-period').
160 Remove indentation from each line."
162 ;; Ideally, we'd want to scan the text from the end, so that changes to
163 ;; text don't affect the boundary, but the regexp we match against does
164 ;; not match as eagerly when matching backward, so we instead use
165 ;; a marker.
170 ;; Nuke tabs; they get screwed up in a fill.
171 ;; This is quick, but loses when a tab follows the end of a sentence.
172 ;; Actually, it is difficult to tell that from "Mr.\tSmith".
173 ;; Blame the typist.
179 ;; `sentence-end' matched and did not match all spaces.
180 ;; I.e. it only matched the number of spaces it needs: drop the rest.
182 ;; `sentence-end' matched but with nothing left. Either that means
183 ;; nothing should be removed, or it means it's the "old-style"
184 ;; sentence-end which matches all it can. Keep only 2 spaces.
185 ;; We probably don't even need to check `sentence-end-double-space'.
194 ;; Determine number of spaces to leave:
208 "Return the longest common prefix of strings S1 and S2, or nil if none."
211 s1
222 ;; Death to insanely long prefixes.
223 nil
224 str)))
227 "Compute a fill prefix from the text between FROM and TO.
228 This uses the variables `adaptive-fill-regexp' and `adaptive-fill-function'
229 and `adaptive-fill-first-line-regexp'. `paragraph-start' also plays a role;
230 we reject a prefix based on a one-line paragraph if that prefix would
231 act as a paragraph-separator."
237 ;; Move to the second line unless there is just one.
240 ;; Non-nil if we are on the second line.
241 second-line-prefix)
243 ;; We don't need to consider `paragraph-start' here since it
244 ;; will be explicitly checked later on.
245 ;; Also setting first-line-prefix to nil prevents
246 ;; second-line-prefix from being used.
247 ;; ((looking-at paragraph-start) nil)
256 ;; If we get a fill prefix from the second line,
257 ;; make sure it or something compatible is on the first line too.
260 ;; If the non-whitespace chars match the first line,
261 ;; just use it (this subsumes the 2 checks used previously).
262 ;; Used when first line is `/* ...' and second-line is
263 ;; ` * ...'.
269 ;; (assert (string-match "\\`[ \t]*\\'" tmp))
272 second-line-prefix
274 ;; Use the longest common substring of both prefixes,
275 ;; if there is one.
277 second-line-prefix)))))
278 ;; If we get a fill prefix from a one-line paragraph,
279 ;; maybe change it to whitespace,
280 ;; and check that it isn't a paragraph starter.
283 ;; If first-line-prefix comes from the first line,
284 ;; see if it seems reasonable to use for all lines.
285 ;; If not, replace it with whitespace.
288 first-line-prefix))
291 first-line-prefix)))
292 first-line-prefix
294 ;; But either way, reject it if it indicates the start
295 ;; of a paragraph when text follows it.
298 result)))))))
301 "Don't break a line after the first or before the last word of a sentence."
302 ;; Actually, allow breaking before the last word of a sentence, so long as
303 ;; it's not the last word of the paragraph.
313 "Return nil if French style allows breaking the line at point.
314 This is used in `fill-nobreak-predicate' to prevent breaking lines just
315 after an opening paren or just before a closing paren or a punctuation
316 mark such as `?' or `:'. It is common in French writing to put a space
317 at such places, which would normally allow breaking the line at those
318 places."
325 ;; Don't cut right after a single-letter word.
330 "List of predicates for recognizing places not to break a line.
331 The predicates are called with no arguments, with point at the place to
332 be tested. If it returns t, fill commands do not break the line there."
338 "Non-nil means that fill commands do not break lines in invisible text."
343 "Return nil if breaking the line at point is allowed.
344 Can be customized with the variables `fill-nobreak-predicate'
345 and `fill-nobreak-invisible'."
350 ;; Don't break after a period followed by just one space.
351 ;; Move back to the previous place to break.
352 ;; The reason is that if a period ends up at the end of a
353 ;; line, further fills will assume it ends a sentence.
354 ;; If we now know it does not end a sentence, avoid putting
355 ;; it at the end of the line.
361 ;; Another approach to the same problem.
366 ;; Don't split a line if the rest would look like a new paragraph.
370 ;; If this break point is at the end of the line,
371 ;; which can occur for auto-fill, don't consider the newline
372 ;; which follows as a reason to return t.
377 ;; Put `fill-find-break-point-function' property to charsets which
378 ;; require special functions to find line breaking point.
388 "Move point to a proper line breaking position of the current line.
389 Don't move back past the buffer position LIMIT.
391 This function is called when we are going to break the current line
392 after or before a non-ASCII character. If the charset of the
393 character has the property `fill-find-break-point-function', this
394 function calls the property value as a function with one arg LIMIT.
395 If the charset has no such property, do nothing."
398 func)
409 "Delete the fill prefix from every line except the first.
410 The first line may not even have a fill prefix.
411 Point is moved to just past the fill prefix on the first line."
420 ;; Why signal an error here? The problem needs to be caught elsewhere.
421 ;; (if (>= (+ (current-left-margin) (length prefix))
422 ;; (current-fill-column))
423 ;; (error "fill-prefix too long for specified width"))
434 ;; The `fill-space' property carries the string with which a newline
435 ;; should be replaced when unbreaking a line (in fill-delete-newlines).
436 ;; It is added to newline characters by fill-newline when the default
437 ;; behavior of fill-delete-newlines is not what we want.
442 ;; Make sure sentences ending at end of line get an extra space.
443 ;; loses on split abbrevs ("Mr.\nSmith")
447 ;; Try to add the : inside the `sentence-end' regexp.
450 ;; Can't find the right spot to insert the colon.
457 sentence-end-without-space-list)
462 ;; Delete unnecessay newlines surrounded by words. The
463 ;; character category `|' means that we can break a line
464 ;; at the character. And, charset property
465 ;; `nospace-between-words' tells how to concatenate
466 ;; words. If the value is non-nil, never put spaces
467 ;; between words, thus delete a newline between them.
468 ;; If the value is nil, delete a newline only when a
469 ;; character preceding a newline has text property
470 ;; `nospace-between-words'.
486 ;; Then change all newlines to spaces.
489 nil
491 ;; Remove trailing whitespace.
492 ;; Maybe canonically-space-region should do that.
497 "Move to the position where the line should be broken.
498 The break position will be always after LINEBEG and generally before point."
499 ;; If the fill column is before linebeg, move to linebeg.
501 ;; Move back to the point where we can break the line
502 ;; at. We break the line between word or after/before
503 ;; the character which has character category `|'. We
504 ;; search space, \c| followed by a character, or \c|
505 ;; following a character. If not found, place
506 ;; the point at linebeg.
509 ;; In case of space, we place the point at next to
510 ;; the point where the break occurs actually,
511 ;; because we don't want to change the following
512 ;; logic of original Emacs. In case of \c|, the
513 ;; point is at the place where the break occurs.
517 ;; Move back over the single space between the words.
520 ;; If the left margin and fill prefix by themselves
521 ;; pass the fill-column. or if they are zero
522 ;; but we have no room for even one word,
523 ;; keep at least one word or a character which has
524 ;; category `|' anyway.
526 ;; Ok, skip at least one word or one \c| character.
527 ;; Meanwhile, don't stop at a period followed by one space.
532 ;; Find a breakable point while ignoring the
533 ;; following spaces.
546 ;; If we are going to break the line after or
547 ;; before a non-ascii character, we may have to
548 ;; run a special function for the charset of the
549 ;; character to find the correct break point.
552 ;; Make sure we take SOMETHING after the fill prefix if any.
555 ;; Like text-properties-at but don't include `composition' property.
558 prop-list)
564 prop-list))
567 ;; Replace whitespace here with one newline, then
568 ;; indent to left margin.
571 ;; Give newline the properties of the space(s) it replaces
577 ;; When refilling later on, this newline would normally not be replaced
578 ;; by a space, so we need to mark it specially to re-install the space
579 ;; when we unfill.
581 ;; If we don't want breaks in invisible text, don't insert
582 ;; an invisible newline.
590 ;; Insert the fill prefix after indentation.
592 ;; Markers that were after the whitespace are now at point: insert
593 ;; before them so they don't get stuck before the prefix.
597 "Indent current line to the column given by `current-left-margin'."
603 nosqueeze squeeze-after)
604 "Fill the region as one paragraph.
605 It removes any paragraph breaks in the region and extra newlines at the end,
606 indents and fills lines between the margins given by the
607 `current-left-margin' and `current-fill-column' functions.
608 \(In most cases, the variable `fill-column' controls the width.)
609 It leaves point at the beginning of the line following the paragraph.
611 Normally performs justification according to the `current-justification'
612 function, but with a prefix arg, does full justification instead.
614 From a program, optional third arg JUSTIFY can specify any type of
615 justification. Fourth arg NOSQUEEZE non-nil means not to make spaces
616 between words canonical before filling. Fifth arg SQUEEZE-AFTER, if non-nil,
617 means don't canonicalize spaces before that position.
619 Return the `fill-prefix' used for filling.
621 If `sentence-end-double-space' is non-nil, then period followed by one
622 space does not end a sentence, so don't break a line there."
630 ;; Make sure "to" is the endpoint.
633 ;; Ignore blank lines at beginning of region.
640 ;; We used to round up to whole line, but that prevents us from
641 ;; correctly handling filling of mixed code-and-comment where we do want
642 ;; to fill the comment but not the code. So only use (point) if it's
643 ;; further than `from', which means that `from' is followed by some
644 ;; number of empty lines.
647 ;; Delete all but one soft newline at end of region.
648 ;; And leave TO before that one.
658 ;; ;; If there was no newline, and there is text in the paragraph, then
659 ;; ;; create a newline.
660 ;; (if (and (not oneleft) (> to from-plus-indent))
661 ;; (newline))
665 nil ;; There is no paragraph, only whitespace: exit now.
669 ;; Don't let Adaptive Fill mode alter the fill prefix permanently.
671 ;; Figure out how this paragraph is indented, if desired.
675 ;; Ignore a white-space only fill-prefix
676 ;; if we indent-according-to-mode.
695 ;; Make sure first line is indented (at least) to left margin...
699 ;; Delete the fill-prefix from every line.
703 ;; FROM, and point, are now before the text to fill,
704 ;; but after any fill prefix on the first line.
708 ;; This is the actual filling loop.
715 ;; Find the position where we'll break the line.
718 ;; Check again to see if we got to the end of
719 ;; the paragraph.
722 ;; Found a place to cut.
726 ;; Justify the line just ended, if desired.
732 ;; Justify this last line, if desired.
734 ;; Leave point after final newline.
737 ;; Return the fill-prefix we used
738 fill-prefix)))
741 "If point is inside the string PREFIX at the beginning of line, move past it."
750 "Fill a paragraph in the minibuffer, ignoring the prompt."
756 "Fill paragraph at or after point.
758 If ARG is non-nil (interactively, with prefix argument), justify as well.
759 If `sentence-end-double-space' is non-nil, then period followed by one
760 space does not end a sentence, so don't break a line there.
761 the variable `fill-column' controls the width for filling.
763 If `fill-paragraph-function' is non-nil, we call it (passing our
764 argument to it), and if it returns non-nil, we simply return its value.
766 If `fill-paragraph-function' is nil, return the `fill-prefix' used for filling."
770 ;; First try fill-paragraph-function.
776 ;; In the minibuffer, don't count the width
777 ;; of the prompt.
779 ;; If fill-paragraph-function is set, it probably takes care
780 ;; of comments and stuff. If not, it will have to set
781 ;; fill-paragraph-handle-comment back to t explicitly or
782 ;; return nil.
786 ;; Then try our syntax-aware filling code.
788 ;; Our code only handles \n-terminated comments right now.
792 ;; If it all fails, default to the good ol' text paragraph filling.
795 ;; Fill prefix used for filling the paragraph.
796 fill-pfx)
797 ;; Try to prevent code sections and comment sections from being
798 ;; filled together.
804 ;; To make sure the return value of forward-paragraph is meaningful,
805 ;; we have to start from the beginning of line, otherwise skipping
806 ;; past the last few chars of a paragraph-separator would count as
807 ;; a paragraph (and not skipping any chars at EOB would not count
808 ;; as a paragraph even if it is).
811 ;; There's no paragraph at or after point: give up.
818 ;; Can't use fill-region-as-paragraph, since this
819 ;; paragraph may still contain hard newlines. See
820 ;; fill-region.
823 fill-pfx)))
826 "Fill current comment.
827 If we're not in a comment, just return nil so that the caller
828 can take care of filling. JUSTIFY is used as in `fill-paragraph'."
831 comin comstart)
832 ;; Figure out what kind of comment we are looking at.
841 ;; Make sure the comment-start mark we found is accepted by
842 ;; comment-start-skip. If not, all bets are off, and
843 ;; we'd better not mess with it.
847 ;; Return nil, so the normal filling will take place.
848 nil
850 ;; Narrow to include only the comment, and then fill the region.
855 ;; A regexp more specialized than comment-start-skip, that only
856 ;; matches the current commark rather than any valid commark.
857 ;;
858 ;; The specialized regexp only works for "normal" comment
859 ;; syntax, not for Texinfo's "@c" (which can't be immediately
860 ;; followed by word-chars) or Fortran's "C" (which needs to be
861 ;; at bol), so check that comment-start-skip indeed allows the
862 ;; commark to appear in the middle of the line and followed by
863 ;; word chars. The choice of "\0" and "a" is mostly arbitrary.
866 ;; Make sure we only match comments that
867 ;; use the exact same comment marker.
882 beg end)
887 ;; Find the first line we should include in the region to fill.
893 ;; We may have gone too far. Go forward again.
902 ;; Find the beginning of the first line past the region to fill.
907 ;; Obey paragraph starters and boundaries within comments.
909 ;; Use the default values since they correspond to
910 ;; the values to use for plain text.
918 ;; We used to rely on fill-prefix to break paragraph at
919 ;; comment-starter changes, but it did not work for the
920 ;; first line (mixed comment&code).
921 ;; We now use comment-re instead to "manually" make sure
922 ;; we treat comment-marker changes as paragraph boundaries.
923 ;; (paragraph-ignore-fill-prefix nil)
924 ;; (fill-prefix comment-fill-prefix)
928 ;; If this comment starts on a line with code,
929 ;; include that line in the filling.
935 ;; Find the fill-prefix to use.
944 ;; Don't fill with narrowing.
948 ;; Don't canonicalize spaces within the code just before
949 ;; the comment.
953 nil
955 ;; Make sure we don't return nil.
956 t))))))
959 "Fill each of the paragraphs in the region.
960 A prefix arg means justify as well.
961 Ordinarily the variable `fill-column' controls the width.
963 Noninteractively, the third argument JUSTIFY specifies which
964 kind of justification to do: `full', `left', `right', `center',
965 or `none' (equivalent to nil). A value of t means handle each
966 paragraph as specified by its text properties.
968 The fourth arg NOSQUEEZE non-nil means to leave whitespace other
969 than line breaks untouched, and fifth arg TO-EOP non-nil means
970 to keep filling to the end of the paragraph (or next hard newline,
971 if variable `use-hard-newlines' is on).
973 Return the fill-prefix used for filling the last paragraph.
975 If `sentence-end-double-space' is non-nil, then period followed by one
976 space does not end a sentence, so don't break a line there."
993 end)
994 ;; If using hard newlines, break at every one for filling
995 ;; purposes rather than using paragraph breaks.
1014 fill-pfx))
1016 \f
1018 "*Method of justifying text not otherwise specified.
1019 Possible values are `left', `right', `full', `center', or `none'.
1020 The requested kind of justification is done whenever lines are filled.
1021 The `justification' text-property can locally override this variable."
1031 "How should we justify this line?
1032 This returns the value of the text-property `justification',
1033 or the variable `default-justification' if there is no text-property.
1036 ;; Make sure we're looking at paragraph body.
1041 default-justification)))
1043 nil
1044 j)))
1047 "Set the region's justification style to STYLE.
1048 This commands prompts for the kind of justification to use.
1049 If the mark is not active, this command operates on the current paragraph.
1050 If the mark is active, it operates on the region. However, if the
1051 beginning and end of the region are not at paragraph breaks, they are
1052 moved to the beginning and end \(respectively) of the paragraphs they
1053 are in.
1055 If variable `use-hard-newlines' is true, all hard newlines are
1056 taken to be paragraph breaks.
1058 When calling from a program, operates just on region between BEGIN and END,
1059 unless optional fourth arg WHOLE-PAR is non-nil. In that case bounds are
1060 extended to include entire paragraphs as in the interactive command."
1064 "Set justification to: "
1067 nil t)))
1070 t))
1076 paragraph-ignore-fill-prefix)))
1092 "Disable automatic filling for paragraphs in the region.
1093 If the mark is not active, this applies to the current paragraph."
1099 "Make paragraphs in the region left-justified.
1100 This means they are flush at the left margin and ragged on the right.
1101 This is usually the default, but see the variable `default-justification'.
1102 If the mark is not active, this applies to the current paragraph."
1108 "Make paragraphs in the region right-justified.
1109 This means they are flush at the right margin and ragged on the left.
1110 If the mark is not active, this applies to the current paragraph."
1116 "Make paragraphs in the region fully justified.
1117 This makes lines flush on both margins by inserting spaces between words.
1118 If the mark is not active, this applies to the current paragraph."
1124 "Make paragraphs in the region centered.
1125 If the mark is not active, this applies to the current paragraph."
1130 ;; A line has up to six parts:
1131 ;;
1132 ;; >>> hello.
1133 ;; [Indent-1][FP][ Indent-2 ][text][trailing whitespace][newline]
1134 ;;
1135 ;; "Indent-1" is the left-margin indentation; normally it ends at column
1136 ;; given by the `current-left-margin' function.
1137 ;; "FP" is the fill-prefix. It can be any string, including whitespace.
1138 ;; "Indent-2" is added to justify a line if the `current-justification' is
1139 ;; `center' or `right'. In `left' and `full' justification regions, any
1140 ;; whitespace there is part of the line's text, and should not be changed.
1141 ;; Trailing whitespace is not counted as part of the line length when
1142 ;; center- or right-justifying.
1143 ;;
1144 ;; All parts of the line are optional, although the final newline can
1145 ;; only be missing on the last line of the buffer.
1148 "Do some kind of justification on this line.
1149 Normally does full justification: adds spaces to the line to make it end at
1150 the column given by `current-fill-column'.
1151 Optional first argument HOW specifies alternate type of justification:
1152 it can be `left', `right', `full', `center', or `none'.
1153 If HOW is t, will justify however the `current-justification' function says to.
1154 If HOW is nil or missing, full justification is done by default.
1155 Second arg EOP non-nil means that this is the last line of the paragraph, so
1156 it will not be stretched by full justification.
1157 Third arg NOSQUEEZE non-nil means to leave interior whitespace unchanged,
1158 otherwise it is made canonical."
1167 fp-end ; point at end of fill prefix
1168 beg ; point at beginning of line's text
1169 end ; point at end of line's text
1170 indent ; column of `beg'
1171 endcol ; column of `end'
1172 ncols ; new indent point or offset
1174 ; in line (not space characters)
1176 count)
1178 ;; Check if this is the last line of the paragraph.
1183 ;; Quick exit if it appears to be properly justified already
1184 ;; or there is no text.
1188 nil
1192 ;; Skip over fill-prefix.
1205 ;; This is beginning of the line's text.
1211 ;; HOW can't be null or left--we would have exited already
1215 ;; Need to remove some indentation
1222 ;; Need to add some
1225 ;; If point was at beginning of text, keep it there.
1230 ;; Figure out how much indentation is needed
1236 ;; Have too much indentation - remove some
1243 ;; Have too little - add some
1246 ;; If point was at beginning of text, keep it there.
1251 ;; Insert extra spaces between words to justify line
1257 ;; count word spaces in line
1262 ;; Ncols is number of additional space chars needed
1266 count nspaces)
1273 curr-fracspace
1278 nil)
1281 "Remove justification whitespace from current line.
1282 If the line is centered or right-justified, this function removes any
1283 indentation past the left margin. If the line is full-justified, it removes
1284 extra spaces between words. It does nothing in other justification modes."
1294 ;; Position ourselves after any fill-prefix.
1306 "Remove justification whitespace from region.
1307 For centered or right-justified regions, this function removes any indentation
1308 past the left margin from each line. For full-justified lines, it removes
1309 extra spaces between words. It does nothing in other justification modes.
1310 Arguments BEGIN and END are optional; default is the whole buffer."
1319 \f
1321 "Fill paragraphs within the region, allowing varying indentation within each.
1323 only at paragraph-separator lines, then fills each paragraph
1324 using as the fill prefix the smallest indentation of any line
1325 in the paragraph.
1327 When calling from a program, pass range to fill as first two arguments.
1329 Optional third and fourth arguments JUSTIFYP and CITATION-REGEXP:
1330 JUSTIFYP to justify paragraphs (prefix arg).
1331 When filling a mail message, pass a regexp for CITATION-REGEXP
1332 which will match the prefix of a line which is a citation marker
1333 plus whitespace, but no other kind of prefix.
1334 Also, if CITATION-REGEXP is non-nil, don't fill header lines."
1343 "Fill paragraphs of uniform indentation within the region.
1345 treating every change in indentation level or prefix as a paragraph boundary,
1346 then fills each paragraph using its indentation level as the fill prefix.
1348 There is one special case where a change in indentation does not start
1349 a new paragraph. This is for text of this form:
1351 foo> This line with extra indentation starts
1352 foo> a paragraph that continues on more lines.
1354 These lines are filled together.
1356 When calling from a program, pass the range to fill
1357 as the first two arguments.
1359 Optional third and fourth arguments JUSTIFY and CITATION-REGEXP:
1360 JUSTIFY to justify paragraphs (prefix arg).
1361 When filling a mail message, pass a regexp for CITATION-REGEXP
1362 which will match the prefix of a line which is a citation marker
1363 plus whitespace, but no other kind of prefix.
1364 Also, if CITATION-REGEXP is non-nil, don't fill header lines."
1382 ;; Loop over paragraphs.
1384 ;; Skip over all paragraph-separating lines
1385 ;; so as to not include them in any paragraph.
1394 fill-prefix fill-prefix-regexp)
1395 ;; Find end of paragraph, and compute the smallest fill-prefix
1396 ;; that fits all the lines in this paragraph.
1398 ;; Update the fill-prefix on the first line
1399 ;; and whenever the prefix good so far is too long.
1404 citation-regexp)
1408 ;; If forward-line went past a newline,
1409 ;; move further to the left margin.
1411 ;; Now stop the loop if end of paragraph.
1414 ;; If this line is a separator line, with or
1415 ;; without prefix, end the paragraph.
1423 paragraph-separate))))))
1424 ;; If this line has more or less indent
1425 ;; than the fill prefix wants, end the paragraph.
1427 ;; If fill prefix is shorter than a new
1428 ;; fill prefix computed here, end paragraph.
1431 citation-regexp)))
1441 citation-regexp
1443 ;; Fill this paragraph, but don't add a newline at the end.
1451 ;; Accept any prefix rather than just the ones matched by
1452 ;; adaptive-fill-first-line-regexp.
1459 ;; See if the citation part of JUST-ONE-LINE-PREFIX
1460 ;; is the same as that of TWO-LINES-PREFIX,
1461 ;; except perhaps with longer whitespace.
1465 just-one-line-prefix citation-regexp))
1468 two-lines-prefix citation-regexp))
1472 two-lines-citation-part))))
1476 adjusted-two-lines-citation-part)
1478 one-line-citation-part)
1481 two-lines-prefix
1482 just-one-line-prefix))))
1489 string))
1491 ;; arch-tag: 727ad455-1161-4fa9-8df5-0f74b179216d
1492 ;;; fill.el ends here