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1526 lines
59 KiB
EmacsLisp
1526 lines
59 KiB
EmacsLisp
;;; fill.el --- fill commands for Emacs -*- coding: utf-8 -*-
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;; Copyright (C) 1985-1986, 1992, 1994-1997, 1999, 2001-2012
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;; Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: wp
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;; Package: emacs
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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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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(defgroup fill nil
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"Indenting and filling text."
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:link '(custom-manual "(emacs)Filling")
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:group 'editing)
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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 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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(put 'colon-double-space 'safe-local-variable 'booleanp)
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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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A value of t means explicitly \"do nothing special\".
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Note: This only affects `fill-paragraph' and not `fill-region'
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nor `auto-fill-mode', so it is often better to use some other hook,
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such as `fill-forward-paragraph-function'.")
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(defvar fill-paragraph-handle-comment t
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"Non-nil means paragraph filling will try to pay attention to comments.")
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(defcustom enable-kinsoku t
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"Non-nil means enable \"kinsoku\" processing on filling paragraphs.
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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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:type 'boolean
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:group 'fill)
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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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(let ((left-margin-pos (save-excursion (move-to-left-margin) (point))))
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(if (> (point) left-margin-pos)
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(progn
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(setq fill-prefix (buffer-substring left-margin-pos (point)))
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(if (equal fill-prefix "")
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(setq fill-prefix nil)))
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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 canceled")))
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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
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;; Added `!' for doxygen comments starting with `//!' or `/*!'.
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;; Added `%' for TeX comments.
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;; RMS: deleted the code to match `1.' and `(1)'.
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;; Update mail-mode's paragraph-separate if you change this.
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(purecopy "[ \t]*\\([-–!|#%;>*·•‣⁃◦]+[ \t]*\\)*")
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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 (purecopy "\\`[ \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, or nil.
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A nil value means the function has not determined the fill prefix."
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:type '(choice (const nil) function)
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:group 'fill)
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(defvar fill-indent-according-to-mode nil ;Screws up CC-mode's filling tricks.
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"Whether or not filling should try to use the major mode's indentation.")
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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 (line-beginning-position))
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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
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;; 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', `colon-double-space',
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and `sentence-end-without-period').
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Remove indentation from each line."
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(interactive "*r")
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;; Ideally, we'd want to scan the text from the end, so that changes to
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;; text don't affect the boundary, but the regexp we match against does
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;; not match as eagerly when matching backward, so we instead use
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;; a marker.
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(unless (markerp end) (setq end (copy-marker end t)))
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(let ((end-spc-re (concat "\\(" (sentence-end) "\\) *\\| +")))
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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 ?\s)
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(while (and (< (point) end)
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(re-search-forward end-spc-re end t))
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(delete-region
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(cond
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;; `sentence-end' matched and did not match all spaces.
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;; I.e. it only matched the number of spaces it needs: drop the rest.
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((and (match-end 1) (> (match-end 0) (match-end 1))) (match-end 1))
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;; `sentence-end' matched but with nothing left. Either that means
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;; nothing should be removed, or it means it's the "old-style"
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;; sentence-end which matches all it can. Keep only 2 spaces.
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;; We probably don't even need to check `sentence-end-double-space'.
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((match-end 1)
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(min (match-end 0)
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(+ (if sentence-end-double-space 2 1)
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(save-excursion (goto-char (match-end 0))
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(skip-chars-backward " ")
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(point)))))
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(t ;; It's not an end of sentence.
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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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(or (memq (preceding-char) '(?. ?? ?!))
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(and sentence-end-without-period
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(= (char-syntax (preceding-char)) ?w)))) 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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(defun fill-common-string-prefix (s1 s2)
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"Return the longest common prefix of strings S1 and S2, or nil if none."
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(let ((cmp (compare-strings s1 nil nil s2 nil nil)))
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(if (eq cmp t)
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s1
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(setq cmp (1- (abs cmp)))
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(unless (zerop cmp)
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(substring s1 0 cmp)))))
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(defun fill-match-adaptive-prefix ()
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(let ((str (or
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(and adaptive-fill-function (funcall adaptive-fill-function))
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(and adaptive-fill-regexp (looking-at adaptive-fill-regexp)
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(match-string-no-properties 0)))))
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(if (>= (+ (current-left-margin) (length str)) (current-fill-column))
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;; Death to insanely long prefixes.
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nil
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str)))
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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-regexp' 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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(move-to-left-margin)
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(let (first-line-prefix
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;; Non-nil if we are on the second line.
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second-line-prefix)
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(setq first-line-prefix
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;; We don't need to consider `paragraph-start' here since it
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;; will be explicitly checked later on.
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;; Also setting first-line-prefix to nil prevents
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;; second-line-prefix from being used.
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;; ((looking-at paragraph-start) nil)
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(fill-match-adaptive-prefix))
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(forward-line 1)
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(if (< (point) to)
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(progn
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(move-to-left-margin)
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(setq second-line-prefix
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(cond ((looking-at paragraph-start) nil) ;Can it happen? -Stef
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(t (fill-match-adaptive-prefix))))
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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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(when second-line-prefix
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(unless first-line-prefix (setq first-line-prefix ""))
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;; If the non-whitespace chars match the first line,
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;; just use it (this subsumes the 2 checks used previously).
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;; Used when first line is `/* ...' and second-line is
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;; ` * ...'.
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(let ((tmp second-line-prefix)
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(re "\\`"))
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(while (string-match "\\`[ \t]*\\([^ \t]+\\)" tmp)
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(setq re (concat re ".*" (regexp-quote (match-string 1 tmp))))
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(setq tmp (substring tmp (match-end 0))))
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;; (assert (string-match "\\`[ \t]*\\'" tmp))
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(if (string-match re first-line-prefix)
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second-line-prefix
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;; Use the longest common substring of both prefixes,
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;; if there is one.
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(fill-common-string-prefix first-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) ?\s))))
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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-single-word-nobreak-p ()
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"Don't break a line after the first or before the last word of a sentence."
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;; Actually, allow breaking before the last word of a sentence, so long as
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;; it's not the last word of the paragraph.
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(or (looking-at (concat "[ \t]*\\sw+" "\\(?:" (sentence-end) "\\)[ \t]*$"))
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(save-excursion
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(skip-chars-backward " \t")
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(and (/= (skip-syntax-backward "w") 0)
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(/= (skip-chars-backward " \t") 0)
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(/= (skip-chars-backward ".?!:") 0)
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(looking-at (sentence-end))))))
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(defun fill-french-nobreak-p ()
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"Return nil if French style allows breaking the line at point.
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This is used in `fill-nobreak-predicate' to prevent breaking lines just
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after an opening paren or just before a closing paren or a punctuation
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mark such as `?' or `:'. It is common in French writing to put a space
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at such places, which would normally allow breaking the line at those
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places."
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(or (looking-at "[ \t]*[])}»?!;:-]")
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(save-excursion
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(skip-chars-backward " \t")
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(unless (bolp)
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(backward-char 1)
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(or (looking-at "[([{«]")
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;; Don't cut right after a single-letter word.
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(and (memq (preceding-char) '(?\t ?\s))
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(eq (char-syntax (following-char)) ?w)))))))
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(defcustom fill-nobreak-predicate nil
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"List of predicates for recognizing places not to break a line.
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The predicates are called with no arguments, with point at the place to
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be tested. If it returns t, fill commands do not break the line there."
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:group 'fill
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:type 'hook
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:options '(fill-french-nobreak-p fill-single-word-nobreak-p))
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(defcustom fill-nobreak-invisible nil
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"Non-nil means that fill commands do not break lines in invisible text."
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:type 'boolean
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:group 'fill)
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(defun fill-nobreak-p ()
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"Return nil if breaking the line at point is allowed.
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Can be customized with the variables `fill-nobreak-predicate'
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and `fill-nobreak-invisible'."
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(or
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(and fill-nobreak-invisible (invisible-p (point)))
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(unless (bolp)
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(or
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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
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;; line, further fills will assume it ends a sentence.
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;; If we now know it does not end a sentence, avoid putting
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;; it at the end of the line.
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(and sentence-end-double-space
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(save-excursion
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(skip-chars-backward " ")
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(and (eq (preceding-char) ?.)
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(looking-at " \\([^ ]\\|$\\)"))))
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;; Another approach to the same problem.
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(save-excursion
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(skip-chars-backward " ")
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(and (eq (preceding-char) ?.)
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(not (progn (forward-char -1) (looking-at (sentence-end))))))
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;; Don't split a line if the rest would look like a new paragraph.
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(unless use-hard-newlines
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(save-excursion
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(skip-chars-forward " \t")
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;; If this break point is at the end of the line,
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;; which can occur for auto-fill, don't consider the newline
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;; which follows as a reason to return t.
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(and (not (eolp))
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(looking-at paragraph-start))))
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(run-hook-with-args-until-success 'fill-nobreak-predicate)))))
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(defvar fill-find-break-point-function-table (make-char-table nil)
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"Char-table of special functions to find line breaking point.")
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(defvar fill-nospace-between-words-table (make-char-table nil)
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"Char-table of characters that don't use space between words.")
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(progn
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;; Register `kinsoku' for scripts HAN, KANA, BOPOMOFO, and CJK-MISC.
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;; Also tell that they don't use space between words.
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(map-char-table
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#'(lambda (key val)
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(when (memq val '(han kana bopomofo cjk-misc))
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(set-char-table-range fill-find-break-point-function-table
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key 'kinsoku)
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(set-char-table-range fill-nospace-between-words-table
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key t)))
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char-script-table)
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;; Do the same thing also for full width characters and half
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;; width kana variants.
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(set-char-table-range fill-find-break-point-function-table
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'(#xFF01 . #xFFE6) 'kinsoku)
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(set-char-table-range fill-nospace-between-words-table
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'(#xFF01 . #xFFE6) 'kinsoku))
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(defun fill-find-break-point (limit)
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"Move point to a proper line breaking position of the current line.
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Don't move back past the buffer position LIMIT.
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This function is called when we are going to break the current line
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after or before a non-ASCII character. If the charset of the
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character has the property `fill-find-break-point-function', this
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function calls the property value as a function with one arg LIMIT.
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If the charset has no such property, do nothing."
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(let ((func (or
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(aref fill-find-break-point-function-table (following-char))
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(aref fill-find-break-point-function-table (preceding-char)))))
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(if (and func (fboundp func))
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(funcall func limit))))
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(defun fill-delete-prefix (from to prefix)
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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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Point is moved to just past the fill prefix on the first line."
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(let ((fpre (if (and prefix (not (string-match "\\`[ \t]*\\'" prefix)))
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(concat "[ \t]*\\("
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(replace-regexp-in-string
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"[ \t]+" "[ \t]*"
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(regexp-quote prefix))
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"\\)?[ \t]*")
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"[ \t]*")))
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||
(goto-char from)
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;; Why signal an error here? The problem needs to be caught elsewhere.
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||
;; (if (>= (+ (current-left-margin) (length prefix))
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;; (current-fill-column))
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||
;; (error "fill-prefix too long for specified width"))
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||
(forward-line 1)
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(while (< (point) to)
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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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||
(point)))
|
||
|
||
;; The `fill-space' property carries the string with which a newline
|
||
;; should be replaced when unbreaking a line (in fill-delete-newlines).
|
||
;; It is added to newline characters by fill-newline when the default
|
||
;; behavior of fill-delete-newlines is not what we want.
|
||
(add-to-list 'text-property-default-nonsticky '(fill-space . t))
|
||
|
||
(defun fill-delete-newlines (from to justify nosqueeze squeeze-after)
|
||
(goto-char from)
|
||
;; Make sure sentences ending at end of line get an extra space.
|
||
;; loses on split abbrevs ("Mr.\nSmith")
|
||
(let ((eol-double-space-re
|
||
(cond
|
||
((not colon-double-space) (concat (sentence-end) "$"))
|
||
;; Try to add the : inside the `sentence-end' regexp.
|
||
((string-match "\\[[^][]*\\(\\.\\)[^][]*\\]" (sentence-end))
|
||
(concat (replace-match ".:" nil nil (sentence-end) 1) "$"))
|
||
;; Can't find the right spot to insert the colon.
|
||
(t "[.?!:][])}\"']*$")))
|
||
(sentence-end-without-space-list
|
||
(string-to-list sentence-end-without-space)))
|
||
(while (re-search-forward eol-double-space-re to t)
|
||
(or (>= (point) to) (memq (char-before) '(?\t ?\s))
|
||
(memq (char-after (match-beginning 0))
|
||
sentence-end-without-space-list)
|
||
(insert-and-inherit ?\s))))
|
||
|
||
(goto-char from)
|
||
(if enable-multibyte-characters
|
||
;; Delete unnecessary newlines surrounded by words. The
|
||
;; character category `|' means that we can break a line at the
|
||
;; character. And, char-table
|
||
;; `fill-nospace-between-words-table' tells how to concatenate
|
||
;; words. If a character has non-nil value in the table, never
|
||
;; put spaces between words, thus delete a newline between them.
|
||
;; Otherwise, delete a newline only when a character preceding a
|
||
;; newline has non-nil value in that table.
|
||
(while (search-forward "\n" to t)
|
||
(if (get-text-property (match-beginning 0) 'fill-space)
|
||
(replace-match (get-text-property (match-beginning 0) 'fill-space))
|
||
(let ((prev (char-before (match-beginning 0)))
|
||
(next (following-char)))
|
||
(if (and (or (aref (char-category-set next) ?|)
|
||
(aref (char-category-set prev) ?|))
|
||
(or (aref fill-nospace-between-words-table next)
|
||
(aref fill-nospace-between-words-table prev)))
|
||
(delete-char -1))))))
|
||
|
||
(goto-char from)
|
||
(skip-chars-forward " \t")
|
||
;; Then change all newlines to spaces.
|
||
(subst-char-in-region from to ?\n ?\s)
|
||
(if (and nosqueeze (not (eq justify 'full)))
|
||
nil
|
||
(canonically-space-region (or squeeze-after (point)) to)
|
||
;; Remove trailing whitespace.
|
||
;; Maybe canonically-space-region should do that.
|
||
(goto-char to) (delete-char (- (skip-chars-backward " \t"))))
|
||
(goto-char from))
|
||
|
||
(defun fill-move-to-break-point (linebeg)
|
||
"Move to the position where the line should be broken.
|
||
The break position will be always after LINEBEG and generally before point."
|
||
;; If the fill column is before linebeg, move to linebeg.
|
||
(if (> linebeg (point)) (goto-char linebeg))
|
||
;; Move back to the point where we can break the line
|
||
;; at. We break the line between word or after/before
|
||
;; the character which has character category `|'. We
|
||
;; search space, \c| followed by a character, or \c|
|
||
;; following a character. If not found, place
|
||
;; the point at linebeg.
|
||
(while
|
||
(when (re-search-backward "[ \t]\\|\\c|.\\|.\\c|" linebeg 0)
|
||
;; In case of space, we place the point at next to
|
||
;; the point where the break occurs actually,
|
||
;; because we don't want to change the following
|
||
;; logic of original Emacs. In case of \c|, the
|
||
;; point is at the place where the break occurs.
|
||
(forward-char 1)
|
||
(when (fill-nobreak-p) (skip-chars-backward " \t" linebeg))))
|
||
|
||
;; Move back over the single space between the words.
|
||
(skip-chars-backward " \t")
|
||
|
||
;; If the left margin and fill prefix by themselves
|
||
;; pass the fill-column. or if they are zero
|
||
;; but we have no room for even one word,
|
||
;; keep at least one word or a character which has
|
||
;; category `|' anyway.
|
||
(if (>= linebeg (point))
|
||
;; Ok, skip at least one word or one \c| character.
|
||
;; Meanwhile, don't stop at a period followed by one space.
|
||
(let ((to (line-end-position))
|
||
(first t))
|
||
(goto-char linebeg)
|
||
(while (and (< (point) to) (or first (fill-nobreak-p)))
|
||
;; Find a breakable point while ignoring the
|
||
;; following spaces.
|
||
(skip-chars-forward " \t")
|
||
(if (looking-at "\\c|")
|
||
(forward-char 1)
|
||
(let ((pos (save-excursion
|
||
(skip-chars-forward "^ \n\t")
|
||
(point))))
|
||
(if (re-search-forward "\\c|" pos t)
|
||
(forward-char -1)
|
||
(goto-char pos))))
|
||
(setq first nil)))
|
||
|
||
(if enable-multibyte-characters
|
||
;; If we are going to break the line after or
|
||
;; before a non-ascii character, we may have to
|
||
;; run a special function for the charset of the
|
||
;; character to find the correct break point.
|
||
(if (not (and (eq (charset-after (1- (point))) 'ascii)
|
||
(eq (charset-after (point)) 'ascii)))
|
||
;; Make sure we take SOMETHING after the fill prefix if any.
|
||
(fill-find-break-point linebeg)))))
|
||
|
||
;; Like text-properties-at but don't include `composition' property.
|
||
(defun fill-text-properties-at (pos)
|
||
(let ((l (text-properties-at pos))
|
||
prop-list)
|
||
(while l
|
||
(unless (eq (car l) 'composition)
|
||
(setq prop-list
|
||
(cons (car l) (cons (cadr l) prop-list))))
|
||
(setq l (cddr l)))
|
||
prop-list))
|
||
|
||
(defun fill-newline ()
|
||
;; Replace whitespace here with one newline, then
|
||
;; indent to left margin.
|
||
(skip-chars-backward " \t")
|
||
(insert ?\n)
|
||
;; Give newline the properties of the space(s) it replaces
|
||
(set-text-properties (1- (point)) (point)
|
||
(fill-text-properties-at (point)))
|
||
(and (looking-at "\\( [ \t]*\\)\\(\\c|\\)?")
|
||
(or (aref (char-category-set (or (char-before (1- (point))) ?\000)) ?|)
|
||
(match-end 2))
|
||
;; When refilling later on, this newline would normally not be replaced
|
||
;; by a space, so we need to mark it specially to re-install the space
|
||
;; when we unfill.
|
||
(put-text-property (1- (point)) (point) 'fill-space (match-string 1)))
|
||
;; If we don't want breaks in invisible text, don't insert
|
||
;; an invisible newline.
|
||
(if fill-nobreak-invisible
|
||
(remove-text-properties (1- (point)) (point)
|
||
'(invisible t)))
|
||
(if (or fill-prefix
|
||
(not fill-indent-according-to-mode))
|
||
(fill-indent-to-left-margin)
|
||
(indent-according-to-mode))
|
||
;; Insert the fill prefix after indentation.
|
||
(and fill-prefix (not (equal fill-prefix ""))
|
||
;; Markers that were after the whitespace are now at point: insert
|
||
;; before them so they don't get stuck before the prefix.
|
||
(insert-before-markers-and-inherit fill-prefix)))
|
||
|
||
(defun fill-indent-to-left-margin ()
|
||
"Indent current line to the column given by `current-left-margin'."
|
||
(let ((beg (point)))
|
||
(indent-line-to (current-left-margin))
|
||
(put-text-property beg (point) 'face 'default)))
|
||
|
||
(defun fill-region-as-paragraph (from to &optional justify
|
||
nosqueeze squeeze-after)
|
||
"Fill the region as one paragraph.
|
||
It removes any paragraph breaks in the region and extra newlines at the end,
|
||
indents and fills lines between the margins given by the
|
||
`current-left-margin' and `current-fill-column' functions.
|
||
\(In most cases, the variable `fill-column' controls the width.)
|
||
It leaves point at the beginning of the line following the paragraph.
|
||
|
||
Normally performs justification according to the `current-justification'
|
||
function, but with a prefix arg, does full justification instead.
|
||
|
||
From a program, optional third arg JUSTIFY can specify any type of
|
||
justification. Fourth arg NOSQUEEZE non-nil means not to make spaces
|
||
between words canonical before filling. Fifth arg SQUEEZE-AFTER, if non-nil,
|
||
means don't canonicalize spaces before that position.
|
||
|
||
Return the `fill-prefix' used for filling.
|
||
|
||
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 (progn
|
||
(barf-if-buffer-read-only)
|
||
(list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full))))
|
||
(unless (memq justify '(t nil none full center left right))
|
||
(setq justify 'full))
|
||
|
||
;; Make sure "to" is the endpoint.
|
||
(goto-char (min from to))
|
||
(setq to (max from to))
|
||
;; Ignore blank lines at beginning of region.
|
||
(skip-chars-forward " \t\n")
|
||
|
||
(let ((from-plus-indent (point))
|
||
(oneleft nil))
|
||
|
||
(beginning-of-line)
|
||
;; We used to round up to whole line, but that prevents us from
|
||
;; correctly handling filling of mixed code-and-comment where we do want
|
||
;; to fill the comment but not the code. So only use (point) if it's
|
||
;; further than `from', which means that `from' is followed by some
|
||
;; number of empty lines.
|
||
(setq from (max (point) from))
|
||
|
||
;; Delete all but one soft newline at end of region.
|
||
;; And leave TO before that one.
|
||
(goto-char to)
|
||
(while (and (> (point) from) (eq ?\n (char-after (1- (point)))))
|
||
(if (and oneleft
|
||
(not (and use-hard-newlines
|
||
(get-text-property (1- (point)) 'hard))))
|
||
(delete-char -1)
|
||
(backward-char 1)
|
||
(setq oneleft t)))
|
||
(setq to (copy-marker (point) t))
|
||
;; ;; If there was no newline, and there is text in the paragraph, then
|
||
;; ;; create a newline.
|
||
;; (if (and (not oneleft) (> to from-plus-indent))
|
||
;; (newline))
|
||
(goto-char from-plus-indent))
|
||
|
||
(if (not (> to (point)))
|
||
nil ;; There is no paragraph, only whitespace: exit now.
|
||
|
||
(or justify (setq justify (current-justification)))
|
||
|
||
;; Don't let Adaptive Fill mode alter the fill prefix permanently.
|
||
(let ((fill-prefix fill-prefix))
|
||
;; Figure out how this paragraph is indented, if desired.
|
||
(when (and adaptive-fill-mode
|
||
(or (null fill-prefix) (string= fill-prefix "")))
|
||
(setq fill-prefix (fill-context-prefix from to))
|
||
;; Ignore a white-space only fill-prefix
|
||
;; if we indent-according-to-mode.
|
||
(when (and fill-prefix fill-indent-according-to-mode
|
||
(string-match "\\`[ \t]*\\'" fill-prefix))
|
||
(setq fill-prefix nil)))
|
||
|
||
(goto-char from)
|
||
(beginning-of-line)
|
||
|
||
(if (not justify) ; filling disabled: just check indentation
|
||
(progn
|
||
(goto-char from)
|
||
(while (< (point) to)
|
||
(if (and (not (eolp))
|
||
(< (current-indentation) (current-left-margin)))
|
||
(fill-indent-to-left-margin))
|
||
(forward-line 1)))
|
||
|
||
(if use-hard-newlines
|
||
(remove-list-of-text-properties from to '(hard)))
|
||
;; Make sure first line is indented (at least) to left margin...
|
||
(if (or (memq justify '(right center))
|
||
(< (current-indentation) (current-left-margin)))
|
||
(fill-indent-to-left-margin))
|
||
;; Delete the fill-prefix from every line.
|
||
(fill-delete-prefix from to fill-prefix)
|
||
(setq from (point))
|
||
|
||
;; FROM, and point, are now before the text to fill,
|
||
;; but after any fill prefix on the first line.
|
||
|
||
(fill-delete-newlines from to justify nosqueeze squeeze-after)
|
||
|
||
;; This is the actual filling loop.
|
||
(goto-char from)
|
||
(let (linebeg)
|
||
(while (< (point) to)
|
||
(setq linebeg (point))
|
||
(move-to-column (current-fill-column))
|
||
(if (when (< (point) to)
|
||
;; Find the position where we'll break the line.
|
||
(forward-char 1) ;Use an immediately following space, if any.
|
||
(fill-move-to-break-point linebeg)
|
||
;; Check again to see if we got to the end of
|
||
;; the paragraph.
|
||
(skip-chars-forward " \t")
|
||
(< (point) to))
|
||
;; Found a place to cut.
|
||
(progn
|
||
(fill-newline)
|
||
(when justify
|
||
;; Justify the line just ended, if desired.
|
||
(save-excursion
|
||
(forward-line -1)
|
||
(justify-current-line justify nil t))))
|
||
|
||
(goto-char to)
|
||
;; Justify this last line, if desired.
|
||
(if justify (justify-current-line justify t t))))))
|
||
;; Leave point after final newline.
|
||
(goto-char to)
|
||
(unless (eobp) (forward-char 1))
|
||
;; Return the fill-prefix we used
|
||
fill-prefix)))
|
||
|
||
(defsubst skip-line-prefix (prefix)
|
||
"If point is inside the string PREFIX at the beginning of line, move past it."
|
||
(when (and prefix
|
||
(< (- (point) (line-beginning-position)) (length prefix))
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(looking-at (regexp-quote prefix))))
|
||
(goto-char (match-end 0))))
|
||
|
||
(defun fill-minibuffer-function (arg)
|
||
"Fill a paragraph in the minibuffer, ignoring the prompt."
|
||
(save-restriction
|
||
(narrow-to-region (minibuffer-prompt-end) (point-max))
|
||
(fill-paragraph arg)))
|
||
|
||
(defvar fill-forward-paragraph-function 'forward-paragraph
|
||
"Function to move over paragraphs used by the filling code.
|
||
It is called with a single argument specifying the number of paragraphs to move.
|
||
Just like `forward-paragraph', it should return the number of paragraphs
|
||
left to move.")
|
||
|
||
(defun fill-forward-paragraph (arg)
|
||
(funcall fill-forward-paragraph-function arg))
|
||
|
||
(defun fill-paragraph (&optional justify region)
|
||
"Fill paragraph at or after point.
|
||
|
||
If JUSTIFY is non-nil (interactively, with prefix argument), 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.
|
||
|
||
If `fill-paragraph-function' is nil, return the `fill-prefix' used for filling.
|
||
|
||
The REGION argument is non-nil if called interactively; in that
|
||
case, if Transient Mark mode is enabled and the mark is active,
|
||
call `fill-region' to fill each of the paragraphs in the active
|
||
region, instead of just filling the current paragraph."
|
||
(interactive (progn
|
||
(barf-if-buffer-read-only)
|
||
(list (if current-prefix-arg 'full) t)))
|
||
(or
|
||
;; 1. Fill the region if it is active when called interactively.
|
||
(and region transient-mark-mode mark-active
|
||
(not (eq (region-beginning) (region-end)))
|
||
(or (fill-region (region-beginning) (region-end) justify) t))
|
||
;; 2. Try fill-paragraph-function.
|
||
(and (not (eq fill-paragraph-function t))
|
||
(or fill-paragraph-function
|
||
(and (minibufferp (current-buffer))
|
||
(= 1 (point-min))))
|
||
(let ((function (or fill-paragraph-function
|
||
;; In the minibuffer, don't count the width
|
||
;; of the prompt.
|
||
'fill-minibuffer-function))
|
||
;; If fill-paragraph-function is set, it probably takes care
|
||
;; of comments and stuff. If not, it will have to set
|
||
;; fill-paragraph-handle-comment back to t explicitly or
|
||
;; return nil.
|
||
(fill-paragraph-handle-comment nil)
|
||
(fill-paragraph-function t))
|
||
(funcall function justify)))
|
||
;; 3. Try our syntax-aware filling code.
|
||
(and fill-paragraph-handle-comment
|
||
;; Our code only handles \n-terminated comments right now.
|
||
comment-start (equal comment-end "")
|
||
(let ((fill-paragraph-handle-comment nil))
|
||
(fill-comment-paragraph justify)))
|
||
;; 4. If it all fails, default to the good ol' text paragraph filling.
|
||
(let ((before (point))
|
||
(paragraph-start paragraph-start)
|
||
;; Fill prefix used for filling the paragraph.
|
||
fill-pfx)
|
||
;; Try to prevent code sections and comment sections from being
|
||
;; filled together.
|
||
(when (and fill-paragraph-handle-comment comment-start-skip)
|
||
(setq paragraph-start
|
||
(concat paragraph-start "\\|[ \t]*\\(?:"
|
||
comment-start-skip "\\)")))
|
||
(save-excursion
|
||
;; To make sure the return value of forward-paragraph is meaningful,
|
||
;; we have to start from the beginning of line, otherwise skipping
|
||
;; past the last few chars of a paragraph-separator would count as
|
||
;; a paragraph (and not skipping any chars at EOB would not count
|
||
;; as a paragraph even if it is).
|
||
(move-to-left-margin)
|
||
(if (not (zerop (fill-forward-paragraph 1)))
|
||
;; There's no paragraph at or after point: give up.
|
||
(setq fill-pfx "")
|
||
(let ((end (point))
|
||
(beg (progn (fill-forward-paragraph -1) (point))))
|
||
(goto-char before)
|
||
(setq fill-pfx
|
||
(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 justify)
|
||
(fill-region-as-paragraph beg end justify))))))
|
||
fill-pfx)))
|
||
|
||
(declare-function comment-search-forward "newcomment" (limit &optional noerror))
|
||
(declare-function comment-string-strip "newcomment" (str beforep afterp))
|
||
|
||
|
||
(defun fill-comment-paragraph (&optional justify)
|
||
"Fill current comment.
|
||
If we're not in a comment, just return nil so that the caller
|
||
can take care of filling. JUSTIFY is used as in `fill-paragraph'."
|
||
(comment-normalize-vars)
|
||
(let (has-code-and-comment ; Non-nil if it contains code and a comment.
|
||
comin comstart)
|
||
;; Figure out what kind of comment we are looking at.
|
||
(save-excursion
|
||
(beginning-of-line)
|
||
(when (setq comstart (comment-search-forward (line-end-position) t))
|
||
(setq comin (point))
|
||
(goto-char comstart) (skip-chars-backward " \t")
|
||
(setq has-code-and-comment (not (bolp)))))
|
||
|
||
(if (not (and comstart
|
||
;; Make sure the comment-start mark we found is accepted by
|
||
;; comment-start-skip. If not, all bets are off, and
|
||
;; we'd better not mess with it.
|
||
(string-match comment-start-skip
|
||
(buffer-substring comstart comin))))
|
||
|
||
;; Return nil, so the normal filling will take place.
|
||
nil
|
||
|
||
;; Narrow to include only the comment, and then fill the region.
|
||
(let* ((fill-prefix fill-prefix)
|
||
(commark
|
||
(comment-string-strip (buffer-substring comstart comin) nil t))
|
||
(comment-re
|
||
;; A regexp more specialized than comment-start-skip, that only
|
||
;; matches the current commark rather than any valid commark.
|
||
;;
|
||
;; The specialized regexp only works for "normal" comment
|
||
;; syntax, not for Texinfo's "@c" (which can't be immediately
|
||
;; followed by word-chars) or Fortran's "C" (which needs to be
|
||
;; at bol), so check that comment-start-skip indeed allows the
|
||
;; commark to appear in the middle of the line and followed by
|
||
;; word chars. The choice of "\0" and "a" is mostly arbitrary.
|
||
(if (string-match comment-start-skip (concat "\0" commark "a"))
|
||
(concat "[ \t]*" (regexp-quote commark)
|
||
;; Make sure we only match comments that
|
||
;; use the exact same comment marker.
|
||
"[^" (substring commark -1) "]")
|
||
(concat "[ \t]*\\(?:" comment-start-skip "\\)")))
|
||
(comment-fill-prefix ; Compute a fill prefix.
|
||
(save-excursion
|
||
(goto-char comstart)
|
||
(if has-code-and-comment
|
||
(concat
|
||
(if (not indent-tabs-mode)
|
||
(make-string (current-column) ?\s)
|
||
(concat
|
||
(make-string (/ (current-column) tab-width) ?\t)
|
||
(make-string (% (current-column) tab-width) ?\s)))
|
||
(buffer-substring (point) comin))
|
||
(buffer-substring (line-beginning-position) comin))))
|
||
beg end)
|
||
(save-excursion
|
||
(save-restriction
|
||
(beginning-of-line)
|
||
(narrow-to-region
|
||
;; Find the first line we should include in the region to fill.
|
||
(if has-code-and-comment
|
||
(line-beginning-position)
|
||
(save-excursion
|
||
(while (and (zerop (forward-line -1))
|
||
(looking-at comment-re)))
|
||
;; We may have gone too far. Go forward again.
|
||
(line-beginning-position
|
||
(if (progn
|
||
(goto-char
|
||
(or (comment-search-forward (line-end-position) t)
|
||
(point)))
|
||
(looking-at comment-re))
|
||
(progn (setq comstart (point)) 1)
|
||
(progn (setq comstart (point)) 2)))))
|
||
;; Find the beginning of the first line past the region to fill.
|
||
(save-excursion
|
||
(while (progn (forward-line 1)
|
||
(looking-at comment-re)))
|
||
(point)))
|
||
;; Obey paragraph starters and boundaries within comments.
|
||
(let* ((paragraph-separate
|
||
;; Use the default values since they correspond to
|
||
;; the values to use for plain text.
|
||
(concat paragraph-separate "\\|[ \t]*\\(?:"
|
||
comment-start-skip "\\)\\(?:"
|
||
(default-value 'paragraph-separate) "\\)"))
|
||
(paragraph-start
|
||
(concat paragraph-start "\\|[ \t]*\\(?:"
|
||
comment-start-skip "\\)\\(?:"
|
||
(default-value 'paragraph-start) "\\)"))
|
||
;; We used to rely on fill-prefix to break paragraph at
|
||
;; comment-starter changes, but it did not work for the
|
||
;; first line (mixed comment&code).
|
||
;; We now use comment-re instead to "manually" make sure
|
||
;; we treat comment-marker changes as paragraph boundaries.
|
||
;; (paragraph-ignore-fill-prefix nil)
|
||
;; (fill-prefix comment-fill-prefix)
|
||
(after-line (if has-code-and-comment
|
||
(line-beginning-position 2))))
|
||
(setq end (progn (forward-paragraph) (point)))
|
||
;; If this comment starts on a line with code,
|
||
;; include that line in the filling.
|
||
(setq beg (progn (backward-paragraph)
|
||
(if (eq (point) after-line)
|
||
(forward-line -1))
|
||
(point)))))
|
||
|
||
;; Find the fill-prefix to use.
|
||
(cond
|
||
(fill-prefix) ; Use the user-provided fill prefix.
|
||
((and adaptive-fill-mode ; Try adaptive fill mode.
|
||
(setq fill-prefix (fill-context-prefix beg end))
|
||
(string-match comment-start-skip fill-prefix)))
|
||
(t
|
||
(setq fill-prefix comment-fill-prefix)))
|
||
|
||
;; Don't fill with narrowing.
|
||
(or
|
||
(fill-region-as-paragraph
|
||
(max comstart beg) end justify nil
|
||
;; Don't canonicalize spaces within the code just before
|
||
;; the comment.
|
||
(save-excursion
|
||
(goto-char beg)
|
||
(if (looking-at fill-prefix)
|
||
nil
|
||
(re-search-forward comment-start-skip))))
|
||
;; Make sure we don't return nil.
|
||
t))))))
|
||
|
||
(defun fill-region (from to &optional justify nosqueeze to-eop)
|
||
"Fill each of the paragraphs in the region.
|
||
A prefix arg means justify as well.
|
||
The `fill-column' variable controls the width.
|
||
|
||
Noninteractively, the third argument JUSTIFY specifies which
|
||
kind of justification to do: `full', `left', `right', `center',
|
||
or `none' (equivalent to nil). A value of t means handle each
|
||
paragraph as specified by its text properties.
|
||
|
||
The 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 variable `use-hard-newlines' is on).
|
||
|
||
Return the fill-prefix used for filling the last paragraph.
|
||
|
||
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 (progn
|
||
(barf-if-buffer-read-only)
|
||
(list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full))))
|
||
(unless (memq justify '(t nil none full center left right))
|
||
(setq justify 'full))
|
||
(let ((start-point (point-marker))
|
||
max beg fill-pfx)
|
||
(goto-char (max from to))
|
||
(when to-eop
|
||
(skip-chars-backward "\n")
|
||
(fill-forward-paragraph 1))
|
||
(setq max (copy-marker (point) t))
|
||
(goto-char (setq beg (min from to)))
|
||
(beginning-of-line)
|
||
(while (< (point) max)
|
||
(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) max
|
||
'hard t))
|
||
(not (= ?\n (char-after end)))
|
||
(not (>= end max)))
|
||
(goto-char (1+ end)))
|
||
(setq end (if end (min max (1+ end)) max))
|
||
(goto-char initial))
|
||
(fill-forward-paragraph 1)
|
||
(setq end (min max (point)))
|
||
(fill-forward-paragraph -1))
|
||
(if (< (point) beg)
|
||
(goto-char beg))
|
||
(if (and (>= (point) initial) (< (point) end))
|
||
(setq fill-pfx
|
||
(fill-region-as-paragraph (point) end justify nosqueeze))
|
||
(goto-char end))))
|
||
(goto-char start-point)
|
||
(set-marker start-point nil)
|
||
fill-pfx))
|
||
|
||
|
||
(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."
|
||
:type '(choice (const left)
|
||
(const right)
|
||
(const full)
|
||
(const center)
|
||
(const none))
|
||
:safe 'symbolp
|
||
: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 style &optional whole-par)
|
||
"Set the region's justification style to STYLE.
|
||
This commands prompts for the kind of justification to use.
|
||
If the mark is not active, this command operates on the current paragraph.
|
||
If the mark is active, it operates on the region. However, if the
|
||
beginning and end of the region are not at paragraph breaks, they are
|
||
moved to the beginning and end \(respectively) of the paragraphs they
|
||
are in.
|
||
|
||
If variable `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 style)
|
||
(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 means they are flush at the left margin and ragged on the right.
|
||
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.
|
||
This means they are 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
|
||
(nspaces 0) ; number of spaces between words
|
||
; in line (not space characters)
|
||
(curr-fracspace 0) ; current fractional space amount
|
||
count)
|
||
(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))
|
||
;; count word spaces in line
|
||
(while (search-backward " " nil t)
|
||
(setq nspaces (1+ nspaces))
|
||
(skip-chars-backward " "))
|
||
(setq ncols (- fc endcol))
|
||
;; Ncols is number of additional space chars needed
|
||
(when (and (> ncols 0) (> nspaces 0) (not eop))
|
||
(setq curr-fracspace (+ ncols (/ nspaces 2))
|
||
count nspaces)
|
||
(while (> count 0)
|
||
(skip-chars-forward " ")
|
||
(insert-char ?\s (/ curr-fracspace nspaces) t)
|
||
(search-forward " " nil t)
|
||
(setq count (1- count)
|
||
curr-fracspace
|
||
(+ (% curr-fracspace nspaces) 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) (line-end-position)))
|
||
((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 citation-regexp)
|
||
"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 JUSTIFYP and CITATION-REGEXP:
|
||
JUSTIFYP to justify paragraphs (prefix arg).
|
||
When filling a mail message, pass a regexp for CITATION-REGEXP
|
||
which will match the prefix of a line which is a citation marker
|
||
plus whitespace, but no other kind of prefix.
|
||
Also, if CITATION-REGEXP is non-nil, don't fill header lines."
|
||
(interactive (progn
|
||
(barf-if-buffer-read-only)
|
||
(list (region-beginning) (region-end)
|
||
(if current-prefix-arg 'full))))
|
||
(let ((fill-individual-varying-indent t))
|
||
(fill-individual-paragraphs min max justifyp citation-regexp)))
|
||
|
||
(defun fill-individual-paragraphs (min max &optional justify citation-regexp)
|
||
"Fill paragraphs of uniform indentation within the region.
|
||
This command divides the region into \"paragraphs\",
|
||
treating every change in indentation level or prefix as a paragraph boundary,
|
||
then fills each paragraph using its indentation level as the fill prefix.
|
||
|
||
There is one special case where a change in indentation does not start
|
||
a new paragraph. This is for text of this form:
|
||
|
||
foo> This line with extra indentation starts
|
||
foo> a paragraph that continues on more lines.
|
||
|
||
These lines are filled together.
|
||
|
||
When calling from a program, pass the range to fill
|
||
as the first two arguments.
|
||
|
||
Optional third and fourth arguments JUSTIFY and CITATION-REGEXP:
|
||
JUSTIFY to justify paragraphs (prefix arg).
|
||
When filling a mail message, pass a regexp for CITATION-REGEXP
|
||
which will match the prefix of a line which is a citation marker
|
||
plus whitespace, but no other kind of prefix.
|
||
Also, if CITATION-REGEXP is non-nil, don't fill header lines."
|
||
(interactive (progn
|
||
(barf-if-buffer-read-only)
|
||
(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 citation-regexp
|
||
(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 over all paragraph-separating lines
|
||
;; so as to not include them in any paragraph.
|
||
(while (and (not (eobp))
|
||
(progn (move-to-left-margin)
|
||
(and (not (eobp))
|
||
(looking-at paragraph-separate))))
|
||
(forward-line 1))
|
||
(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
|
||
(fill-individual-paragraphs-prefix
|
||
citation-regexp)
|
||
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)
|
||
;; If fill prefix is shorter than a new
|
||
;; fill prefix computed here, end paragraph.
|
||
(let ((this-line-fill-prefix
|
||
(fill-individual-paragraphs-prefix
|
||
citation-regexp)))
|
||
(>= (length fill-prefix)
|
||
(length this-line-fill-prefix)))
|
||
(save-excursion
|
||
(not (progn (forward-char
|
||
(length fill-prefix))
|
||
(or (looking-at "[ \t]")
|
||
(looking-at paragraph-separate)
|
||
(looking-at paragraph-start)))))
|
||
(not (and (equal fill-prefix "")
|
||
citation-regexp
|
||
(looking-at citation-regexp))))))))
|
||
;; Fill this paragraph, but don't add a newline at the end.
|
||
(let ((had-newline (bolp)))
|
||
(fill-region-as-paragraph start (point) justify)
|
||
(if (and (bolp) (not had-newline))
|
||
(delete-char -1))))))))
|
||
|
||
(defun fill-individual-paragraphs-prefix (citation-regexp)
|
||
(let* ((adaptive-fill-first-line-regexp ".*")
|
||
(just-one-line-prefix
|
||
;; Accept any prefix rather than just the ones matched by
|
||
;; adaptive-fill-first-line-regexp.
|
||
(fill-context-prefix (point) (line-beginning-position 2)))
|
||
(two-lines-prefix
|
||
(fill-context-prefix (point) (line-beginning-position 3))))
|
||
(if (not just-one-line-prefix)
|
||
(buffer-substring
|
||
(point) (save-excursion (skip-chars-forward " \t") (point)))
|
||
;; See if the citation part of JUST-ONE-LINE-PREFIX
|
||
;; is the same as that of TWO-LINES-PREFIX,
|
||
;; except perhaps with longer whitespace.
|
||
(if (and just-one-line-prefix two-lines-prefix
|
||
(let* ((one-line-citation-part
|
||
(fill-individual-paragraphs-citation
|
||
just-one-line-prefix citation-regexp))
|
||
(two-lines-citation-part
|
||
(fill-individual-paragraphs-citation
|
||
two-lines-prefix citation-regexp))
|
||
(adjusted-two-lines-citation-part
|
||
(substring two-lines-citation-part 0
|
||
(string-match "[ \t]*\\'"
|
||
two-lines-citation-part))))
|
||
(and
|
||
(string-match (concat "\\`"
|
||
(regexp-quote
|
||
adjusted-two-lines-citation-part)
|
||
"[ \t]*\\'")
|
||
one-line-citation-part)
|
||
(>= (string-width one-line-citation-part)
|
||
(string-width two-lines-citation-part)))))
|
||
two-lines-prefix
|
||
just-one-line-prefix))))
|
||
|
||
(defun fill-individual-paragraphs-citation (string citation-regexp)
|
||
(if citation-regexp
|
||
(if (string-match citation-regexp string)
|
||
(match-string 0 string)
|
||
"")
|
||
string))
|
||
|
||
;;; fill.el ends here
|