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266 lines
9.1 KiB
EmacsLisp
266 lines
9.1 KiB
EmacsLisp
;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source
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;; Copyright (C) 1985, 1986, 1994, 1995 Free Software Foundation, Inc.
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;; Maintainer: FSF
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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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;; This package is a major mode for editing nroff source code. It knows
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;; about various nroff constructs, ms, mm, and me macros, and will fill
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;; and indent paragraphs properly in their presence. It also includes
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;; a command to count text lines (excluding nroff constructs), a command
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;; to center a line, and movement commands that know how to skip macros.
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;; Paragraph filling and line-counting currently don't respect comments,
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;; as they should.
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;;; Code:
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(defgroup nroff nil
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"Nroff mode."
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:group 'wp
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:prefix "nroff-")
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(defcustom nroff-electric-mode nil
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"*Non-nil means automatically closing requests when you insert an open."
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:group 'nroff
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:type 'boolean)
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(defvar nroff-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map "\t" 'tab-to-tab-stop)
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(define-key map "\es" 'center-line)
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(define-key map "\e?" 'count-text-lines)
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(define-key map "\n" 'electric-nroff-newline)
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(define-key map "\en" 'forward-text-line)
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(define-key map "\ep" 'backward-text-line)
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map)
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"Major mode keymap for `nroff-mode'.")
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(defvar nroff-mode-syntax-table
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(let ((st (copy-syntax-table text-mode-syntax-table)))
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;; " isn't given string quote syntax in text-mode but it
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;; (arguably) should be for use round nroff arguments (with ` and
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;; ' used otherwise).
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(modify-syntax-entry ?\" "\" 2" st)
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;; Comments are delimited by \" and newline.
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(modify-syntax-entry ?\\ "\\ 1" st)
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(modify-syntax-entry ?\n "> 1" st)
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st)
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"Syntax table used while in `nroff-mode'.")
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(defcustom nroff-font-lock-keywords
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(list
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;; Directives are . or ' at start of line, followed by
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;; optional whitespace, then command (which my be longer than
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;; 2 characters in groff). Perhaps the arguments should be
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;; fontified as well.
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"^[.']\\s-*\\sw+"
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;; There are numerous groff escapes; the following get things
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;; like \-, \(em (standard troff) and \f[bar] (groff
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;; variants). This won't currently do groff's \A'foo' and
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;; the like properly. One might expect it to highlight an escape's
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;; arguments in common cases, like \f.
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(concat "\\\\" ; backslash
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"\\(" ; followed by various possibilities
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(mapconcat 'identity
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'("[f*n]*\\[.+]" ; some groff extensions
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"(.." ; two chars after (
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"[^(\"]" ; single char escape
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) "\\|")
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"\\)")
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)
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"Font-lock highlighting control in `nroff-mode'."
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:group 'nroff
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:type '(repeat regexp))
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;;;###autoload
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(define-derived-mode nroff-mode text-mode "Nroff"
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"Major mode for editing text intended for nroff to format.
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\\{nroff-mode-map}
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Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'.
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Also, try `nroff-electric-mode', for automatically inserting
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closing requests for requests that are used in matched pairs."
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(set (make-local-variable 'font-lock-defaults)
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;; SYNTAX-BEGIN is set to backward-paragraph to avoid slow-down
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;; near the end of large buffers due to searching to buffer's
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;; beginning.
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'(nroff-font-lock-keywords nil t nil backward-paragraph))
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(set (make-local-variable 'nroff-electric-mode) nil)
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(set (make-local-variable 'outline-regexp) "\\.H[ ]+[1-7]+ ")
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(set (make-local-variable 'outline-level) 'nroff-outline-level)
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;; now define a bunch of variables for use by commands in this mode
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(set (make-local-variable 'page-delimiter) "^\\.\\(bp\\|SK\\|OP\\)")
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(set (make-local-variable 'paragraph-start)
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(concat "[.']\\|" paragraph-start))
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(set (make-local-variable 'paragraph-separate)
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(concat "[.']\\|" paragraph-separate))
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;; comment syntax added by mit-erl!gildea 18 Apr 86
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(set (make-local-variable 'comment-start) "\\\" ")
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(set (make-local-variable 'comment-start-skip) "\\\\\"[ \t]*")
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(set (make-local-variable 'comment-column) 24)
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(set (make-local-variable 'comment-indent-function) 'nroff-comment-indent))
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(defun nroff-outline-level ()
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(save-excursion
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(looking-at outline-regexp)
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(skip-chars-forward ".H ")
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(string-to-int (buffer-substring (point) (+ 1 (point))))))
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;;; Compute how much to indent a comment in nroff/troff source.
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;;; By mit-erl!gildea April 86
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(defun nroff-comment-indent ()
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"Compute indent for an nroff/troff comment.
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Puts a full-stop before comments on a line by themselves."
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(let ((pt (point)))
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(unwind-protect
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(progn
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(skip-chars-backward " \t")
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(if (bolp)
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(progn
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(setq pt (1+ pt))
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(insert ?.)
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1)
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(if (save-excursion
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(backward-char 1)
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(looking-at "^[.']"))
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1
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(max comment-column
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(* 8 (/ (+ (current-column)
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9) 8)))))) ; add 9 to ensure at least two blanks
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(goto-char pt))))
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(defun count-text-lines (start end &optional print)
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"Count lines in region, except for nroff request lines.
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All lines not starting with a period are counted up.
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Interactively, print result in echo area.
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Noninteractively, return number of non-request lines from START to END."
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(interactive "r\np")
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(if print
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(message "Region has %d text lines" (count-text-lines start end))
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(save-excursion
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(save-restriction
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(narrow-to-region start end)
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(goto-char (point-min))
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(- (buffer-size) (forward-text-line (buffer-size)))))))
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(defun forward-text-line (&optional cnt)
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"Go forward one nroff text line, skipping lines of nroff requests.
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An argument is a repeat count; if negative, move backward."
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(interactive "p")
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(if (not cnt) (setq cnt 1))
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(while (and (> cnt 0) (not (eobp)))
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(forward-line 1)
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(while (and (not (eobp)) (looking-at "[.']."))
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(forward-line 1))
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(setq cnt (- cnt 1)))
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(while (and (< cnt 0) (not (bobp)))
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(forward-line -1)
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(while (and (not (bobp))
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(looking-at "[.']."))
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(forward-line -1))
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(setq cnt (+ cnt 1)))
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cnt)
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(defun backward-text-line (&optional cnt)
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"Go backward one nroff text line, skipping lines of nroff requests.
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An argument is a repeat count; negative means move forward."
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(interactive "p")
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(forward-text-line (- cnt)))
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(defconst nroff-brace-table
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'((".(b" . ".)b")
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(".(l" . ".)l")
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(".(q" . ".)q")
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(".(c" . ".)c")
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(".(x" . ".)x")
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(".(z" . ".)z")
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(".(d" . ".)d")
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(".(f" . ".)f")
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(".LG" . ".NL")
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(".SM" . ".NL")
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(".LD" . ".DE")
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(".CD" . ".DE")
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(".BD" . ".DE")
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(".DS" . ".DE")
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(".DF" . ".DE")
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(".FS" . ".FE")
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(".KS" . ".KE")
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(".KF" . ".KE")
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(".LB" . ".LE")
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(".AL" . ".LE")
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(".BL" . ".LE")
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(".DL" . ".LE")
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(".ML" . ".LE")
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(".RL" . ".LE")
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(".VL" . ".LE")
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(".RS" . ".RE")
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(".TS" . ".TE")
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(".EQ" . ".EN")
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(".PS" . ".PE")
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(".BS" . ".BE")
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(".G1" . ".G2") ; grap
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(".na" . ".ad b")
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(".nf" . ".fi")
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(".de" . "..")))
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(defun electric-nroff-newline (arg)
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"Insert newline for nroff mode; special if electric-nroff mode.
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In `electric-nroff-mode', if ending a line containing an nroff opening request,
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automatically inserts the matching closing request after point."
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(interactive "P")
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(let ((completion (save-excursion
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(beginning-of-line)
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(and (null arg)
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nroff-electric-mode
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(<= (point) (- (point-max) 3))
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(cdr (assoc (buffer-substring (point)
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(+ 3 (point)))
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nroff-brace-table)))))
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(needs-nl (not (looking-at "[ \t]*$"))))
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(if (null completion)
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(newline (prefix-numeric-value arg))
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(save-excursion
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(insert "\n\n" completion)
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(if needs-nl (insert "\n")))
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(forward-char 1))))
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(defun electric-nroff-mode (&optional arg)
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"Toggle `nroff-electric-newline' minor mode.
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`nroff-electric-newline' forces Emacs to check for an nroff request at the
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beginning of the line, and insert the matching closing request if necessary.
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This command toggles that mode (off->on, on->off), with an argument,
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turns it on iff arg is positive, otherwise off."
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(interactive "P")
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(or (eq major-mode 'nroff-mode) (error "Must be in nroff mode"))
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(or (assq 'nroff-electric-mode minor-mode-alist)
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(setq minor-mode-alist (append minor-mode-alist
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(list '(nroff-electric-mode
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" Electric")))))
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(setq nroff-electric-mode
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(cond ((null arg) (null nroff-electric-mode))
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(t (> (prefix-numeric-value arg) 0)))))
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(provide 'nroff-mode)
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;;; nroff-mode.el ends here
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