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b4d413d983
of adaptive-fill. Call fill-context-prefix, but bind adaptive-fill-first-line-regexp to a null string.
992 lines
37 KiB
EmacsLisp
992 lines
37 KiB
EmacsLisp
;;; fill.el --- fill commands for Emacs
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;; Copyright (C) 1985, 86, 92, 94, 95, 96, 1997 Free Software Foundation, Inc.
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;; Keywords: wp
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; All the commands for filling text. These are documented in the Emacs
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;; manual.
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;;; Code:
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(defcustom fill-individual-varying-indent nil
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"*Controls criterion for a new paragraph in `fill-individual-paragraphs'.
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Non-nil means changing indent doesn't end a paragraph.
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That mode can handle paragraphs with extra indentation on the first line,
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but it requires separator lines between paragraphs.
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A value of nil means that any change in indentation starts a new paragraph."
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:type 'boolean
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:group 'fill)
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(defcustom sentence-end-double-space t
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"*Non-nil means a single space does not end a sentence."
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:type 'boolean
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:group 'fill)
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(defcustom colon-double-space nil
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"*Non-nil means put two spaces after a colon when filling."
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:type 'boolean
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:group 'fill)
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(defvar fill-paragraph-function nil
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"Mode-specific function to fill a paragraph, or nil if there is none.
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If the function returns nil, then `fill-paragraph' does its normal work.")
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(defvar enable-kinsoku t
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"*Non-nil means enable \"kinsoku\" processing on filling paragraph.
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Kinsoku processing is designed to prevent certain characters from being
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placed at the beginning or end of a line by filling.
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See the documentation of `kinsoku' for more information.")
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(defun set-fill-prefix ()
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"Set the fill prefix to the current line up to point.
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Filling expects lines to start with the fill prefix and
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reinserts the fill prefix in each resulting line."
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(interactive)
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(setq fill-prefix (buffer-substring
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(save-excursion (move-to-left-margin) (point))
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(point)))
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(if (equal fill-prefix "")
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(setq fill-prefix nil))
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(if fill-prefix
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(message "fill-prefix: \"%s\"" fill-prefix)
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(message "fill-prefix cancelled")))
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(defcustom adaptive-fill-mode t
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"*Non-nil means determine a paragraph's fill prefix from its text."
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:type 'boolean
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:group 'fill)
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(defcustom adaptive-fill-regexp "[ \t]*\\([-|#;>*]+ *\\|(?[0-9]+[.)] *\\)*"
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"*Regexp to match text at start of line that constitutes indentation.
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If Adaptive Fill mode is enabled, a prefix matching this pattern
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on the first and second lines of a paragraph is used as the
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standard indentation for the whole paragraph.
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If the paragraph has just one line, the indentation is taken from that
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line, but in that case `adaptive-fill-first-line-regexp' also plays
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a role."
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:type 'regexp
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:group 'fill)
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(defcustom adaptive-fill-first-line-regexp "\\`[ \t]*\\'"
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"*Regexp specifying whether to set fill prefix from a one-line paragraph.
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When a paragraph has just one line, then after `adaptive-fill-regexp'
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finds the prefix at the beginning of the line, if it doesn't
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match this regexp, it is replaced with whitespace.
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By default, this regexp matches sequences of just spaces and tabs.
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However, we never use a prefix from a one-line paragraph
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if it would act as a paragraph-starter on the second line."
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:type 'regexp
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:group 'fill)
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(defcustom adaptive-fill-function nil
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"*Function to call to choose a fill prefix for a paragraph.
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This function is used when `adaptive-fill-regexp' does not match."
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:type 'function
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:group 'fill)
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(defun current-fill-column ()
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"Return the fill-column to use for this line.
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The fill-column to use for a buffer is stored in the variable `fill-column',
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but can be locally modified by the `right-margin' text property, which is
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subtracted from `fill-column'.
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The fill column to use for a line is the first column at which the column
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number equals or exceeds the local fill-column - right-margin difference."
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(save-excursion
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(if fill-column
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(let* ((here (progn (beginning-of-line) (point)))
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(here-col 0)
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(eol (progn (end-of-line) (point)))
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margin fill-col change col)
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;; Look separately at each region of line with a different right-margin.
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(while (and (setq margin (get-text-property here 'right-margin)
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fill-col (- fill-column (or margin 0))
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change (text-property-not-all
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here eol 'right-margin margin))
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(progn (goto-char (1- change))
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(setq col (current-column))
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(< col fill-col)))
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(setq here change
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here-col col))
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(max here-col fill-col)))))
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(defun canonically-space-region (beg end)
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"Remove extra spaces between words in region.
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Leave one space between words, two at end of sentences or after colons
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(depending on values of `sentence-end-double-space' and `colon-double-space').
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Remove indentation from each line."
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(interactive "r")
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(save-excursion
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(goto-char beg)
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;; Nuke tabs; they get screwed up in a fill.
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;; This is quick, but loses when a tab follows the end of a sentence.
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;; Actually, it is difficult to tell that from "Mr.\tSmith".
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;; Blame the typist.
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(subst-char-in-region beg end ?\t ?\ )
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(while (and (< (point) end)
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(re-search-forward " *" end t))
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(delete-region
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(+ (match-beginning 0)
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;; Determine number of spaces to leave:
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(save-excursion
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(skip-chars-backward " ]})\"'")
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(cond ((and sentence-end-double-space
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(memq (preceding-char) '(?. ?? ?!))) 2)
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((and colon-double-space
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(= (preceding-char) ?:)) 2)
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((char-equal (preceding-char) ?\n) 0)
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(t 1))))
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(match-end 0)))
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;; Make sure sentences ending at end of line get an extra space.
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;; loses on split abbrevs ("Mr.\nSmith")
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(goto-char beg)
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(while (and (< (point) end)
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(re-search-forward "[.?!][])}\"']*$" end t))
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;; We insert before markers in case a caller such as
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;; do-auto-fill has done a save-excursion with point at the end
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;; of the line and wants it to stay at the end of the line.
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(insert-before-markers-and-inherit ? ))))
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(defun fill-context-prefix (from to &optional first-line-regexp)
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"Compute a fill prefix from the text between FROM and TO.
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This uses the variables `adaptive-fill-prefix' and `adaptive-fill-function'
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and `adaptive-fill-first-line-regexp'. `paragraph-start' also plays a role;
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we reject a prefix based on a one-line paragraph if that prefix would
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act as a paragraph-separator."
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(or first-line-regexp
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(setq first-line-regexp adaptive-fill-first-line-regexp))
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(save-excursion
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(goto-char from)
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(if (eolp) (forward-line 1))
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;; Move to the second line unless there is just one.
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(let ((firstline (point))
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first-line-prefix
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;; Non-nil if we are on the second line.
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at-second
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second-line-prefix
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start)
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(move-to-left-margin)
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(setq start (point))
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(setq first-line-prefix
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(cond ((looking-at paragraph-start) nil)
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((and adaptive-fill-regexp (looking-at adaptive-fill-regexp))
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(buffer-substring-no-properties start (match-end 0)))
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(adaptive-fill-function (funcall adaptive-fill-function))))
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(forward-line 1)
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(if (>= (point) to)
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(goto-char firstline)
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(setq at-second t)
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(move-to-left-margin)
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(setq start (point))
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(setq second-line-prefix
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(cond ((looking-at paragraph-start) nil)
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((and adaptive-fill-regexp (looking-at adaptive-fill-regexp))
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(buffer-substring-no-properties start (match-end 0)))
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(adaptive-fill-function (funcall adaptive-fill-function)))))
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(if at-second
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;; If we get a fill prefix from the second line,
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;; make sure it or something compatible is on the first line too.
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(and second-line-prefix first-line-prefix
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;; If the first line has the second line prefix too, use it.
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(if (or (string-match (concat "\\`"
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(regexp-quote second-line-prefix)
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"\\(\\'\\|[ \t]\\)")
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first-line-prefix)
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;; If the second line prefix is whitespace, use it.
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(string-match "\\`[ \t]+\\'" second-line-prefix))
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second-line-prefix))
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;; If we get a fill prefix from a one-line paragraph,
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;; maybe change it to whitespace,
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;; and check that it isn't a paragraph starter.
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(if first-line-prefix
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(let ((result
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;; If first-line-prefix comes from the first line,
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;; see if it seems reasonable to use for all lines.
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;; If not, replace it with whitespace.
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(if (or (and first-line-regexp
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(string-match first-line-regexp
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first-line-prefix))
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(and comment-start-skip
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(string-match comment-start-skip
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first-line-prefix)))
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first-line-prefix
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(make-string (string-width first-line-prefix) ?\ ))))
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;; But either way, reject it if it indicates the start
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;; of a paragraph when text follows it.
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(if (not (eq 0 (string-match paragraph-start
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(concat result "a"))))
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result)))))))
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(defun fill-region-as-paragraph (from to &optional justify
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nosqueeze squeeze-after)
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"Fill the region as one paragraph.
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It removes any paragraph breaks in the region and extra newlines at the end,
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indents and fills lines between the margins given by the
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`current-left-margin' and `current-fill-column' functions.
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\(In most cases, the variable `fill-column' controls the width.)
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It leaves point at the beginning of the line following the paragraph.
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Normally performs justification according to the `current-justification'
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function, but with a prefix arg, does full justification instead.
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From a program, optional third arg JUSTIFY can specify any type of
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justification. Fourth arg NOSQUEEZE non-nil means not to make spaces
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between words canonical before filling. Fifth arg SQUEEZE-AFTER, if non-nil,
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means don't canonicalize spaces before that position.
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If `sentence-end-double-space' is non-nil, then period followed by one
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space does not end a sentence, so don't break a line there."
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(interactive (list (region-beginning) (region-end)
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(if current-prefix-arg 'full)))
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;; Arrange for undoing the fill to restore point.
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(if (and buffer-undo-list (not (eq buffer-undo-list t)))
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(setq buffer-undo-list (cons (point) buffer-undo-list)))
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;; Make sure "to" is the endpoint.
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(goto-char (min from to))
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(setq to (max from to))
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;; Ignore blank lines at beginning of region.
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(skip-chars-forward " \t\n")
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(let ((from-plus-indent (point))
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(oneleft nil))
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(beginning-of-line)
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(setq from (point))
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;; Delete all but one soft newline at end of region.
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;; And leave TO before that one.
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(goto-char to)
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(while (and (> (point) from) (eq ?\n (char-after (1- (point)))))
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(if (and oneleft
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(not (and use-hard-newlines
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(get-text-property (1- (point)) 'hard))))
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(delete-backward-char 1)
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(backward-char 1)
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(setq oneleft t)))
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(setq to (point))
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;; If there was no newline, and there is text in the paragraph, then
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;; create a newline.
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(if (and (not oneleft) (> to from-plus-indent))
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(newline))
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(goto-char from-plus-indent))
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(if (not (> to (point)))
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nil ; There is no paragraph, only whitespace: exit now.
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(or justify (setq justify (current-justification)))
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;; Don't let Adaptive Fill mode alter the fill prefix permanently.
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(let ((fill-prefix fill-prefix))
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;; Figure out how this paragraph is indented, if desired.
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(if (and adaptive-fill-mode
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(or (null fill-prefix) (string= fill-prefix "")))
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(setq fill-prefix (fill-context-prefix from to)))
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(save-restriction
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(goto-char from)
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(beginning-of-line)
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(narrow-to-region (point) to)
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(if (not justify) ; filling disabled: just check indentation
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(progn
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(goto-char from)
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(while (not (eobp))
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(if (and (not (eolp))
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(< (current-indentation) (current-left-margin)))
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(indent-to-left-margin))
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(forward-line 1)))
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(if use-hard-newlines
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(remove-text-properties from (point-max) '(hard nil)))
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;; Make sure first line is indented (at least) to left margin...
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(if (or (memq justify '(right center))
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(< (current-indentation) (current-left-margin)))
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(indent-to-left-margin))
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;; Delete the fill prefix from every line except the first.
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;; The first line may not even have a fill prefix.
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(goto-char from)
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(let ((fpre (and fill-prefix (not (equal fill-prefix ""))
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(concat "[ \t]*"
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(regexp-quote fill-prefix)
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"[ \t]*"))))
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(and fpre
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(progn
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(if (>= (+ (current-left-margin) (length fill-prefix))
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(current-fill-column))
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(error "fill-prefix too long for specified width"))
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(goto-char from)
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(forward-line 1)
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(while (not (eobp))
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(if (looking-at fpre)
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(delete-region (point) (match-end 0)))
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(forward-line 1))
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(goto-char from)
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(if (looking-at fpre)
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(goto-char (match-end 0)))
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(setq from (point)))))
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;; Remove indentation from lines other than the first.
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(beginning-of-line 2)
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(indent-region (point) (point-max) 0)
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(goto-char from)
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;; FROM, and point, are now before the text to fill,
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;; but after any fill prefix on the first line.
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;; Make sure sentences ending at end of line get an extra space.
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;; loses on split abbrevs ("Mr.\nSmith")
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(while (re-search-forward "[.?!][])}\"']*$" nil t)
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(or (eobp) (insert-and-inherit ?\ )))
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(goto-char from)
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;; The character category `|' means that we can break a line
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;; at the character. Since we don't need a space between
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;; them, delete all newlines between them ...
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(while (re-search-forward "\\c|\n\\|\n\\c|" nil t)
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(if (bolp)
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(delete-char -1)
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(if (= (char-before (match-beginning 0)) ?\ )
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;; ... except when there is end of sentence. The
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;; variable `sentence-end-double-space' is handled
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;; properly later.
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nil
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(delete-region (match-beginning 0) (1+ (match-beginning 0))))))
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(goto-char from)
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(skip-chars-forward " \t")
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;; Then change all newlines to spaces.
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(subst-char-in-region from (point-max) ?\n ?\ )
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(if (and nosqueeze (not (eq justify 'full)))
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nil
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(canonically-space-region (or squeeze-after (point)) (point-max))
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(goto-char (point-max))
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(delete-horizontal-space)
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(insert-and-inherit " "))
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(goto-char (point-min))
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;; This is the actual filling loop.
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(let ((prefixcol 0) linebeg)
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(while (not (eobp))
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(setq linebeg (point))
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(move-to-column (1+ (current-fill-column)))
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(if (eobp)
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(or nosqueeze (delete-horizontal-space))
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;; Move back to the point where we can break the line
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;; at. We break the line between word or after/before
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;; the character which has character category `|'. We
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;; search space, \c| followed by a character, or \c|
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;; following a character. If not found, place
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;; the point at linebeg.
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(if (re-search-backward " \\|\\c|.\\|.\\c|" linebeg 0)
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;; In case of space, we place the point at next to
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;; the point where the break occurs acutually,
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;; because we don't want to change the following
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;; logic of original Emacs. In case of \c|, the
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;; point is at the place where the break occurs.
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(forward-char 1))
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;; Don't break after a period followed by just one space.
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;; Move back to the previous place to break.
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;; The reason is that if a period ends up at the end of a line,
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;; further fills will assume it ends a sentence.
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;; If we now know it does not end a sentence,
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;; avoid putting it at the end of the line.
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(if sentence-end-double-space
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(while (and (> (point) (+ linebeg 2))
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(eq (preceding-char) ?\ )
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(not (eq (following-char) ?\ ))
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(eq (char-after (- (point) 2)) ?\.))
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(forward-char -2)
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(if (re-search-backward " \\|\\c|.\\|.\\c|" linebeg 0)
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(forward-char 1))))
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;; If the left margin and fill prefix by themselves
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;; pass the fill-column. or if they are zero
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;; but we have no room for even one word,
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;; keep at least one word or a character which has
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;; category `|'anyway .
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;; This handles ALL BUT the first line of the paragraph.
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(if (if (zerop prefixcol)
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(save-excursion
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(skip-chars-backward " \t" linebeg)
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(bolp))
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(>= prefixcol (current-column)))
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;; Ok, skip at least one word or one \c| character.
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;; Meanwhile, don't stop at a period followed by one space.
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(let ((first t))
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(move-to-column prefixcol)
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(while (and (not (eobp))
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(or first
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(and (not (bobp))
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sentence-end-double-space
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(save-excursion (forward-char -1)
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(and (looking-at "\\. ")
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(not (looking-at "\\. ")))))))
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(skip-chars-forward " \t")
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;; Skip one \c| character or one word.
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(if (looking-at "$\\|\\c|\\|[^ \t\n]+")
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(goto-char (match-end 0)))
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(setq first nil)))
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;; Normally, move back over the single space between the words.
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(if (= (preceding-char) ?\ ) (forward-char -1))
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;; Do KINSOKU processing.
|
||
(if (and enable-multibyte-characters enable-kinsoku
|
||
(save-excursion
|
||
(goto-char from)
|
||
(skip-chars-forward "\0-\177" to)
|
||
(/= (point) to)))
|
||
(kinsoku linebeg)))
|
||
|
||
;; If the left margin and fill prefix by themselves
|
||
;; pass the fill-column, keep at least one word.
|
||
;; This handles the first line of the paragraph.
|
||
(if (and (zerop prefixcol)
|
||
(let ((fill-point (point)) nchars)
|
||
(save-excursion
|
||
(move-to-left-margin)
|
||
(setq nchars (- fill-point (point)))
|
||
(or (< nchars 0)
|
||
(and fill-prefix
|
||
(< nchars (length fill-prefix))
|
||
(string= (buffer-substring (point) fill-point)
|
||
(substring fill-prefix 0 nchars)))))))
|
||
;; Ok, skip at least one word. But
|
||
;; don't stop at a period followed by just one space.
|
||
(let ((first t))
|
||
(while (and (not (eobp))
|
||
(or first
|
||
(and (not (bobp))
|
||
sentence-end-double-space
|
||
(save-excursion (forward-char -1)
|
||
(and (looking-at "\\. ")
|
||
(not (looking-at "\\. ")))))))
|
||
(skip-chars-forward " \t")
|
||
;; Skip one \c| character or one word.
|
||
(if (looking-at "$\\|\\c|\\|[^ \t\n]+")
|
||
(goto-char (match-end 0)))
|
||
(setq first nil))))
|
||
;; Check again to see if we got to the end of the paragraph.
|
||
(if (save-excursion (skip-chars-forward " \t") (eobp))
|
||
(or nosqueeze (delete-horizontal-space))
|
||
;; Replace whitespace here with one newline, then indent to left
|
||
;; margin.
|
||
(skip-chars-backward " \t")
|
||
(if (and (= (following-char) ?\ )
|
||
(or (aref (char-category-set (preceding-char)) ?|)
|
||
(looking-at "[ \t]+\\c|")))
|
||
;; We need one space at end of line so that
|
||
;; further filling won't delete it. NOTE: We
|
||
;; intentionally leave this one space to
|
||
;; distingush the case that user wants to put
|
||
;; space between \c| characters.
|
||
(forward-char 1))
|
||
(insert ?\n)
|
||
;; Give newline the properties of the space(s) it replaces
|
||
(set-text-properties (1- (point)) (point)
|
||
(text-properties-at (point)))
|
||
(indent-to-left-margin)
|
||
;; Insert the fill prefix after indentation.
|
||
;; Set prefixcol so whitespace in the prefix won't get lost.
|
||
(and fill-prefix (not (equal fill-prefix ""))
|
||
(progn
|
||
(insert-and-inherit fill-prefix)
|
||
(setq prefixcol (current-column))))))
|
||
;; Justify the line just ended, if desired.
|
||
(if justify
|
||
(if (save-excursion (skip-chars-forward " \t") (eobp))
|
||
(progn
|
||
(delete-horizontal-space)
|
||
(justify-current-line justify t t))
|
||
(forward-line -1)
|
||
(justify-current-line justify nil t)
|
||
(forward-line 1))))))
|
||
;; Leave point after final newline.
|
||
(goto-char (point-max)))
|
||
(forward-char 1))))
|
||
|
||
(defun fill-paragraph (arg)
|
||
"Fill paragraph at or after point. Prefix arg means justify as well.
|
||
If `sentence-end-double-space' is non-nil, then period followed by one
|
||
space does not end a sentence, so don't break a line there.
|
||
the variable `fill-column' controls the width for filling.
|
||
|
||
If `fill-paragraph-function' is non-nil, we call it (passing our
|
||
argument to it), and if it returns non-nil, we simply return its value."
|
||
(interactive (list (if current-prefix-arg 'full)))
|
||
(or (and fill-paragraph-function
|
||
(let ((function fill-paragraph-function)
|
||
fill-paragraph-function)
|
||
(funcall function arg)))
|
||
(let ((before (point)))
|
||
(save-excursion
|
||
(forward-paragraph)
|
||
(or (bolp) (newline 1))
|
||
(let ((end (point))
|
||
(beg (progn (backward-paragraph) (point))))
|
||
(goto-char before)
|
||
(if use-hard-newlines
|
||
;; Can't use fill-region-as-paragraph, since this paragraph may
|
||
;; still contain hard newlines. See fill-region.
|
||
(fill-region beg end arg)
|
||
(fill-region-as-paragraph beg end arg)))))))
|
||
|
||
(defun fill-region (from to &optional justify nosqueeze to-eop)
|
||
"Fill each of the paragraphs in the region.
|
||
Prefix arg (non-nil third arg, if called from program) means justify as well.
|
||
Ordinarily the variable `fill-column' controls the width.
|
||
|
||
Noninteractively, fourth arg NOSQUEEZE non-nil means to leave
|
||
whitespace other than line breaks untouched, and fifth arg TO-EOP
|
||
non-nil means to keep filling to the end of the paragraph (or next
|
||
hard newline, if `use-hard-newlines' is on).
|
||
|
||
If `sentence-end-double-space' is non-nil, then period followed by one
|
||
space does not end a sentence, so don't break a line there."
|
||
(interactive (list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full)))
|
||
(let (end beg)
|
||
(save-restriction
|
||
(goto-char (max from to))
|
||
(if to-eop
|
||
(progn (skip-chars-backward "\n")
|
||
(forward-paragraph)))
|
||
(setq end (point))
|
||
(goto-char (setq beg (min from to)))
|
||
(beginning-of-line)
|
||
(narrow-to-region (point) end)
|
||
(while (not (eobp))
|
||
(let ((initial (point))
|
||
end)
|
||
;; If using hard newlines, break at every one for filling
|
||
;; purposes rather than using paragraph breaks.
|
||
(if use-hard-newlines
|
||
(progn
|
||
(while (and (setq end (text-property-any (point) (point-max)
|
||
'hard t))
|
||
(not (= ?\n (char-after end)))
|
||
(not (= end (point-max))))
|
||
(goto-char (1+ end)))
|
||
(setq end (if end (min (point-max) (1+ end)) (point-max)))
|
||
(goto-char initial))
|
||
(forward-paragraph 1)
|
||
(setq end (point))
|
||
(forward-paragraph -1))
|
||
(if (< (point) beg)
|
||
(goto-char beg))
|
||
(if (>= (point) initial)
|
||
(fill-region-as-paragraph (point) end justify nosqueeze)
|
||
(goto-char end)))))))
|
||
|
||
|
||
(defcustom default-justification 'left
|
||
"*Method of justifying text not otherwise specified.
|
||
Possible values are `left', `right', `full', `center', or `none'.
|
||
The requested kind of justification is done whenever lines are filled.
|
||
The `justification' text-property can locally override this variable.
|
||
This variable automatically becomes buffer-local when set in any fashion."
|
||
:type '(choice (const left)
|
||
(const right)
|
||
(const full)
|
||
(const center)
|
||
(const none))
|
||
:group 'fill)
|
||
(make-variable-buffer-local 'default-justification)
|
||
|
||
(defun current-justification ()
|
||
"How should we justify this line?
|
||
This returns the value of the text-property `justification',
|
||
or the variable `default-justification' if there is no text-property.
|
||
However, it returns nil rather than `none' to mean \"don't justify\"."
|
||
(let ((j (or (get-text-property
|
||
;; Make sure we're looking at paragraph body.
|
||
(save-excursion (skip-chars-forward " \t")
|
||
(if (and (eobp) (not (bobp)))
|
||
(1- (point)) (point)))
|
||
'justification)
|
||
default-justification)))
|
||
(if (eq 'none j)
|
||
nil
|
||
j)))
|
||
|
||
(defun set-justification (begin end value &optional whole-par)
|
||
"Set the region's justification style.
|
||
The kind of justification to use is prompted for.
|
||
If the mark is not active, this command operates on the current paragraph.
|
||
If the mark is active, the region is used. However, if the beginning and end
|
||
of the region are not at paragraph breaks, they are moved to the beginning and
|
||
end of the paragraphs they are in.
|
||
If `use-hard-newlines' is true, all hard newlines are taken to be paragraph
|
||
breaks.
|
||
|
||
When calling from a program, operates just on region between BEGIN and END,
|
||
unless optional fourth arg WHOLE-PAR is non-nil. In that case bounds are
|
||
extended to include entire paragraphs as in the interactive command."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))
|
||
(let ((s (completing-read
|
||
"Set justification to: "
|
||
'(("left") ("right") ("full")
|
||
("center") ("none"))
|
||
nil t)))
|
||
(if (equal s "") (error ""))
|
||
(intern s))
|
||
t))
|
||
(save-excursion
|
||
(save-restriction
|
||
(if whole-par
|
||
(let ((paragraph-start (if use-hard-newlines "." paragraph-start))
|
||
(paragraph-ignore-fill-prefix (if use-hard-newlines t
|
||
paragraph-ignore-fill-prefix)))
|
||
(goto-char begin)
|
||
(while (and (bolp) (not (eobp))) (forward-char 1))
|
||
(backward-paragraph)
|
||
(setq begin (point))
|
||
(goto-char end)
|
||
(skip-chars-backward " \t\n" begin)
|
||
(forward-paragraph)
|
||
(setq end (point))))
|
||
|
||
(narrow-to-region (point-min) end)
|
||
(unjustify-region begin (point-max))
|
||
(put-text-property begin (point-max) 'justification value)
|
||
(fill-region begin (point-max) nil t))))
|
||
|
||
(defun set-justification-none (b e)
|
||
"Disable automatic filling for paragraphs in the region.
|
||
If the mark is not active, this applies to the current paragraph."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))))
|
||
(set-justification b e 'none t))
|
||
|
||
(defun set-justification-left (b e)
|
||
"Make paragraphs in the region left-justified.
|
||
This is usually the default, but see the variable `default-justification'.
|
||
If the mark is not active, this applies to the current paragraph."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))))
|
||
(set-justification b e 'left t))
|
||
|
||
(defun set-justification-right (b e)
|
||
"Make paragraphs in the region right-justified:
|
||
Flush at the right margin and ragged on the left.
|
||
If the mark is not active, this applies to the current paragraph."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))))
|
||
(set-justification b e 'right t))
|
||
|
||
(defun set-justification-full (b e)
|
||
"Make paragraphs in the region fully justified:
|
||
This makes lines flush on both margins by inserting spaces between words.
|
||
If the mark is not active, this applies to the current paragraph."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))))
|
||
(set-justification b e 'full t))
|
||
|
||
(defun set-justification-center (b e)
|
||
"Make paragraphs in the region centered.
|
||
If the mark is not active, this applies to the current paragraph."
|
||
(interactive (list (if mark-active (region-beginning) (point))
|
||
(if mark-active (region-end) (point))))
|
||
(set-justification b e 'center t))
|
||
|
||
;; A line has up to six parts:
|
||
;;
|
||
;; >>> hello.
|
||
;; [Indent-1][FP][ Indent-2 ][text][trailing whitespace][newline]
|
||
;;
|
||
;; "Indent-1" is the left-margin indentation; normally it ends at column
|
||
;; given by the `current-left-margin' function.
|
||
;; "FP" is the fill-prefix. It can be any string, including whitespace.
|
||
;; "Indent-2" is added to justify a line if the `current-justification' is
|
||
;; `center' or `right'. In `left' and `full' justification regions, any
|
||
;; whitespace there is part of the line's text, and should not be changed.
|
||
;; Trailing whitespace is not counted as part of the line length when
|
||
;; center- or right-justifying.
|
||
;;
|
||
;; All parts of the line are optional, although the final newline can
|
||
;; only be missing on the last line of the buffer.
|
||
|
||
(defun justify-current-line (&optional how eop nosqueeze)
|
||
"Do some kind of justification on this line.
|
||
Normally does full justification: adds spaces to the line to make it end at
|
||
the column given by `current-fill-column'.
|
||
Optional first argument HOW specifies alternate type of justification:
|
||
it can be `left', `right', `full', `center', or `none'.
|
||
If HOW is t, will justify however the `current-justification' function says to.
|
||
If HOW is nil or missing, full justification is done by default.
|
||
Second arg EOP non-nil means that this is the last line of the paragraph, so
|
||
it will not be stretched by full justification.
|
||
Third arg NOSQUEEZE non-nil means to leave interior whitespace unchanged,
|
||
otherwise it is made canonical."
|
||
(interactive)
|
||
(if (eq t how) (setq how (or (current-justification) 'none))
|
||
(if (null how) (setq how 'full)
|
||
(or (memq how '(none left right center))
|
||
(setq how 'full))))
|
||
(or (memq how '(none left)) ; No action required for these.
|
||
(let ((fc (current-fill-column))
|
||
(pos (point-marker))
|
||
fp-end ; point at end of fill prefix
|
||
beg ; point at beginning of line's text
|
||
end ; point at end of line's text
|
||
indent ; column of `beg'
|
||
endcol ; column of `end'
|
||
ncols) ; new indent point or offset
|
||
(end-of-line)
|
||
;; Check if this is the last line of the paragraph.
|
||
(if (and use-hard-newlines (null eop)
|
||
(get-text-property (point) 'hard))
|
||
(setq eop t))
|
||
(skip-chars-backward " \t")
|
||
;; Quick exit if it appears to be properly justified already
|
||
;; or there is no text.
|
||
(if (or (bolp)
|
||
(and (memq how '(full right))
|
||
(= (current-column) fc)))
|
||
nil
|
||
(setq end (point))
|
||
(beginning-of-line)
|
||
(skip-chars-forward " \t")
|
||
;; Skip over fill-prefix.
|
||
(if (and fill-prefix
|
||
(not (string-equal fill-prefix ""))
|
||
(equal fill-prefix
|
||
(buffer-substring
|
||
(point) (min (point-max) (+ (length fill-prefix)
|
||
(point))))))
|
||
(forward-char (length fill-prefix))
|
||
(if (and adaptive-fill-mode
|
||
(looking-at adaptive-fill-regexp))
|
||
(goto-char (match-end 0))))
|
||
(setq fp-end (point))
|
||
(skip-chars-forward " \t")
|
||
;; This is beginning of the line's text.
|
||
(setq indent (current-column))
|
||
(setq beg (point))
|
||
(goto-char end)
|
||
(setq endcol (current-column))
|
||
|
||
;; HOW can't be null or left--we would have exited already
|
||
(cond ((eq 'right how)
|
||
(setq ncols (- fc endcol))
|
||
(if (< ncols 0)
|
||
;; Need to remove some indentation
|
||
(delete-region
|
||
(progn (goto-char fp-end)
|
||
(if (< (current-column) (+ indent ncols))
|
||
(move-to-column (+ indent ncols) t))
|
||
(point))
|
||
(progn (move-to-column indent) (point)))
|
||
;; Need to add some
|
||
(goto-char beg)
|
||
(indent-to (+ indent ncols))
|
||
;; If point was at beginning of text, keep it there.
|
||
(if (= beg pos)
|
||
(move-marker pos (point)))))
|
||
|
||
((eq 'center how)
|
||
;; Figure out how much indentation is needed
|
||
(setq ncols (+ (current-left-margin)
|
||
(/ (- fc (current-left-margin) ;avail. space
|
||
(- endcol indent)) ;text width
|
||
2)))
|
||
(if (< ncols indent)
|
||
;; Have too much indentation - remove some
|
||
(delete-region
|
||
(progn (goto-char fp-end)
|
||
(if (< (current-column) ncols)
|
||
(move-to-column ncols t))
|
||
(point))
|
||
(progn (move-to-column indent) (point)))
|
||
;; Have too little - add some
|
||
(goto-char beg)
|
||
(indent-to ncols)
|
||
;; If point was at beginning of text, keep it there.
|
||
(if (= beg pos)
|
||
(move-marker pos (point)))))
|
||
|
||
((eq 'full how)
|
||
;; Insert extra spaces between words to justify line
|
||
(save-restriction
|
||
(narrow-to-region beg end)
|
||
(or nosqueeze
|
||
(canonically-space-region beg end))
|
||
(goto-char (point-max))
|
||
(setq ncols (- fc endcol))
|
||
;; Ncols is number of additional spaces needed
|
||
(if (> ncols 0)
|
||
(if (and (not eop)
|
||
(search-backward " " nil t))
|
||
(while (> ncols 0)
|
||
(let ((nmove (+ 3 (random 3))))
|
||
(while (> nmove 0)
|
||
(or (search-backward " " nil t)
|
||
(progn
|
||
(goto-char (point-max))
|
||
(search-backward " ")))
|
||
(skip-chars-backward " ")
|
||
(setq nmove (1- nmove))))
|
||
(insert-and-inherit " ")
|
||
(skip-chars-backward " ")
|
||
(setq ncols (1- ncols)))))))
|
||
(t (error "Unknown justification value"))))
|
||
(goto-char pos)
|
||
(move-marker pos nil)))
|
||
nil)
|
||
|
||
(defun unjustify-current-line ()
|
||
"Remove justification whitespace from current line.
|
||
If the line is centered or right-justified, this function removes any
|
||
indentation past the left margin. If the line is full-justified, it removes
|
||
extra spaces between words. It does nothing in other justification modes."
|
||
(let ((justify (current-justification)))
|
||
(cond ((eq 'left justify) nil)
|
||
((eq nil justify) nil)
|
||
((eq 'full justify) ; full justify: remove extra spaces
|
||
(beginning-of-line-text)
|
||
(canonically-space-region
|
||
(point) (save-excursion (end-of-line) (point))))
|
||
((memq justify '(center right))
|
||
(save-excursion
|
||
(move-to-left-margin nil t)
|
||
;; Position ourselves after any fill-prefix.
|
||
(if (and fill-prefix
|
||
(not (string-equal fill-prefix ""))
|
||
(equal fill-prefix
|
||
(buffer-substring
|
||
(point) (min (point-max) (+ (length fill-prefix)
|
||
(point))))))
|
||
(forward-char (length fill-prefix)))
|
||
(delete-region (point) (progn (skip-chars-forward " \t")
|
||
(point))))))))
|
||
|
||
(defun unjustify-region (&optional begin end)
|
||
"Remove justification whitespace from region.
|
||
For centered or right-justified regions, this function removes any indentation
|
||
past the left margin from each line. For full-justified lines, it removes
|
||
extra spaces between words. It does nothing in other justification modes.
|
||
Arguments BEGIN and END are optional; default is the whole buffer."
|
||
(save-excursion
|
||
(save-restriction
|
||
(if end (narrow-to-region (point-min) end))
|
||
(goto-char (or begin (point-min)))
|
||
(while (not (eobp))
|
||
(unjustify-current-line)
|
||
(forward-line 1)))))
|
||
|
||
|
||
(defun fill-nonuniform-paragraphs (min max &optional justifyp mailp)
|
||
"Fill paragraphs within the region, allowing varying indentation within each.
|
||
This command divides the region into \"paragraphs\",
|
||
only at paragraph-separator lines, then fills each paragraph
|
||
using as the fill prefix the smallest indentation of any line
|
||
in the paragraph.
|
||
|
||
When calling from a program, pass range to fill as first two arguments.
|
||
|
||
Optional third and fourth arguments JUSTIFY and MAIL-FLAG:
|
||
JUSTIFY to justify paragraphs (prefix arg),
|
||
MAIL-FLAG for a mail message, i. e. don't fill header lines."
|
||
(interactive (list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full)))
|
||
(let ((fill-individual-varying-indent t))
|
||
(fill-individual-paragraphs min max justifyp mailp)))
|
||
|
||
(defun fill-individual-paragraphs (min max &optional justify mailp)
|
||
"Fill paragraphs of uniform indentation within the region.
|
||
This command divides the region into \"paragraphs\",
|
||
treating every change in indentation level as a paragraph boundary,
|
||
then fills each paragraph using its indentation level as the fill prefix.
|
||
|
||
When calling from a program, pass range to fill as first two arguments.
|
||
|
||
Optional third and fourth arguments JUSTIFY and MAIL-FLAG:
|
||
JUSTIFY to justify paragraphs (prefix arg),
|
||
MAIL-FLAG for a mail message, i. e. don't fill header lines."
|
||
(interactive (list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full)))
|
||
(save-restriction
|
||
(save-excursion
|
||
(goto-char min)
|
||
(beginning-of-line)
|
||
(narrow-to-region (point) max)
|
||
(if mailp
|
||
(while (and (not (eobp))
|
||
(or (looking-at "[ \t]*[^ \t\n]+:")
|
||
(looking-at "[ \t]*$")))
|
||
(if (looking-at "[ \t]*[^ \t\n]+:")
|
||
(search-forward "\n\n" nil 'move)
|
||
(forward-line 1))))
|
||
(narrow-to-region (point) max)
|
||
;; Loop over paragraphs.
|
||
(while (progn (skip-chars-forward " \t\n") (not (eobp)))
|
||
(move-to-left-margin)
|
||
(let ((start (point))
|
||
fill-prefix fill-prefix-regexp)
|
||
;; Find end of paragraph, and compute the smallest fill-prefix
|
||
;; that fits all the lines in this paragraph.
|
||
(while (progn
|
||
;; Update the fill-prefix on the first line
|
||
;; and whenever the prefix good so far is too long.
|
||
(if (not (and fill-prefix
|
||
(looking-at fill-prefix-regexp)))
|
||
(setq fill-prefix
|
||
(or (let ((adaptive-fill-first-line-regexp ""))
|
||
(fill-context-prefix
|
||
(point)
|
||
(save-excursion (forward-line 2) (point))))
|
||
(buffer-substring
|
||
(point)
|
||
(save-excursion (skip-chars-forward " \t")
|
||
(point))))
|
||
fill-prefix-regexp (regexp-quote fill-prefix)))
|
||
(forward-line 1)
|
||
(if (bolp)
|
||
;; If forward-line went past a newline,
|
||
;; move further to the left margin.
|
||
(move-to-left-margin))
|
||
;; Now stop the loop if end of paragraph.
|
||
(and (not (eobp))
|
||
(if fill-individual-varying-indent
|
||
;; If this line is a separator line, with or
|
||
;; without prefix, end the paragraph.
|
||
(and
|
||
(not (looking-at paragraph-separate))
|
||
(save-excursion
|
||
(not (and (looking-at fill-prefix-regexp)
|
||
(progn (forward-char (length fill-prefix))
|
||
(looking-at paragraph-separate))))))
|
||
;; If this line has more or less indent
|
||
;; than the fill prefix wants, end the paragraph.
|
||
(and (looking-at fill-prefix-regexp)
|
||
(save-excursion
|
||
(not (progn (forward-char (length fill-prefix))
|
||
(or (looking-at paragraph-separate)
|
||
(looking-at paragraph-start))))))))))
|
||
;; Fill this paragraph, but don't add a newline at the end.
|
||
(let ((had-newline (bolp)))
|
||
(fill-region-as-paragraph start (point) justify)
|
||
(or had-newline (delete-char -1))))))))
|
||
|
||
;;; fill.el ends here
|