1 ;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source
3 ;; Copyright (C) 1985, 1986, 1994, 1995, 1997, 2001, 2002, 2003,
4 ;; 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 3, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
28 ;; This package is a major mode for editing nroff source code. It knows
29 ;; about various nroff constructs, ms, mm, and me macros, and will fill
30 ;; and indent paragraphs properly in their presence. It also includes
31 ;; a command to count text lines (excluding nroff constructs), a command
32 ;; to center a line, and movement commands that know how to skip macros.
34 ;; Paragraph filling and line-counting currently don't respect comments,
41 :link
'(custom-group-link :tag
"Font Lock Faces group" font-lock-faces
)
46 (defcustom nroff-electric-mode nil
47 "Non-nil means automatically closing requests when you insert an open."
51 (defvar nroff-mode-map
52 (let ((map (make-sparse-keymap)))
53 (define-key map
"\t" 'tab-to-tab-stop
)
54 (define-key map
"\es" 'center-line
)
55 (define-key map
"\e?" 'nroff-count-text-lines
)
56 (define-key map
"\n" 'nroff-electric-newline
)
57 (define-key map
"\en" 'nroff-forward-text-line
)
58 (define-key map
"\ep" 'nroff-backward-text-line
)
60 "Major mode keymap for `nroff-mode'.")
62 (defvar nroff-mode-syntax-table
63 (let ((st (copy-syntax-table text-mode-syntax-table
)))
64 ;; " isn't given string quote syntax in text-mode but it
65 ;; (arguably) should be for use round nroff arguments (with ` and
67 (modify-syntax-entry ?
\" "\" 2" st
)
68 ;; Comments are delimited by \" and newline.
69 ;; And in groff also \# to newline.
70 (modify-syntax-entry ?
# ". 2" st
)
71 (modify-syntax-entry ?
\\ "\\ 1" st
)
72 (modify-syntax-entry ?
\n ">" st
)
74 "Syntax table used while in `nroff-mode'.")
76 (defvar nroff-imenu-expression
78 '((nil "^\\.SH \"?\\([^\"\n]*\\)\"?$" 1)))
80 (defcustom nroff-font-lock-keywords
82 ;; Directives are . or ' at start of line, followed by
83 ;; optional whitespace, then command (which my be longer than
84 ;; 2 characters in groff). Perhaps the arguments should be
87 ;; There are numerous groff escapes; the following get things
88 ;; like \-, \(em (standard troff) and \f[bar] (groff
89 ;; variants). This won't currently do groff's \A'foo' and
90 ;; the like properly. One might expect it to highlight an escape's
91 ;; arguments in common cases, like \f.
92 (concat "\\\\" ; backslash
93 "\\(" ; followed by various possibilities
95 '("[f*n]*\\[.+?]" ; some groff extensions
96 "(.." ; two chars after (
97 "[^(\"#]" ; single char escape
101 "Font-lock highlighting control in `nroff-mode'."
103 :type
'(repeat regexp
))
105 (defcustom nroff-mode-hook nil
106 "Hook run by function `nroff-mode'."
111 (define-derived-mode nroff-mode text-mode
"Nroff"
112 "Major mode for editing text intended for nroff to format.
114 Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'.
115 Also, try `nroff-electric-mode', for automatically inserting
116 closing requests for requests that are used in matched pairs."
117 (set (make-local-variable 'font-lock-defaults
)
118 ;; SYNTAX-BEGIN is set to backward-paragraph to avoid slow-down
119 ;; near the end of large buffers due to searching to buffer's
121 '(nroff-font-lock-keywords nil t nil backward-paragraph
))
122 (set (make-local-variable 'outline-regexp
) "\\.H[ ]+[1-7]+ ")
123 (set (make-local-variable 'outline-level
) 'nroff-outline-level
)
124 ;; now define a bunch of variables for use by commands in this mode
125 (set (make-local-variable 'page-delimiter
) "^\\.\\(bp\\|SK\\|OP\\)")
126 (set (make-local-variable 'paragraph-start
)
127 (concat "[.']\\|" paragraph-start
))
128 (set (make-local-variable 'paragraph-separate
)
129 (concat "[.']\\|" paragraph-separate
))
130 ;; comment syntax added by mit-erl!gildea 18 Apr 86
131 (set (make-local-variable 'comment-start
) "\\\" ")
132 (set (make-local-variable 'comment-start-skip
) "\\\\[\"#][ \t]*")
133 (set (make-local-variable 'comment-column
) 24)
134 (set (make-local-variable 'comment-indent-function
) 'nroff-comment-indent
)
135 (set (make-local-variable 'comment-insert-comment-function
)
136 'nroff-insert-comment-function
)
137 (set (make-local-variable 'imenu-generic-expression
) nroff-imenu-expression
))
139 (defun nroff-outline-level ()
141 (looking-at outline-regexp
)
142 (skip-chars-forward ".H ")
143 (string-to-number (buffer-substring (point) (+ 1 (point))))))
145 ;; Compute how much to indent a comment in nroff/troff source.
146 ;; By mit-erl!gildea April 86
147 (defun nroff-comment-indent ()
148 "Compute indent for an nroff/troff comment.
149 Puts a full-stop before comments on a line by themselves."
153 (skip-chars-backward " \t")
156 ;; FIXME delete-horizontal-space?
162 (looking-at "^[.']"))
165 (* 8 (/ (+ (current-column)
166 9) 8)))))) ; add 9 to ensure at least two blanks
169 ;; http://lists.gnu.org/archive/html/emacs-devel/2007-10/msg01869.html
170 (defun nroff-insert-comment-function ()
171 "Function for `comment-insert-comment-function' in `nroff-mode'."
172 (indent-to (nroff-comment-indent))
173 (insert comment-start
))
175 (defun nroff-count-text-lines (start end
&optional print
)
176 "Count lines in region, except for nroff request lines.
177 All lines not starting with a period are counted up.
178 Interactively, print result in echo area.
179 Noninteractively, return number of non-request lines from START to END."
182 (message "Region has %d text lines" (nroff-count-text-lines start end
))
185 (narrow-to-region start end
)
186 (goto-char (point-min))
187 (- (buffer-size) (nroff-forward-text-line (buffer-size)))))))
189 (defun nroff-forward-text-line (&optional cnt
)
190 "Go forward one nroff text line, skipping lines of nroff requests.
191 An argument is a repeat count; if negative, move backward."
193 (if (not cnt
) (setq cnt
1))
194 (while (and (> cnt
0) (not (eobp)))
196 (while (and (not (eobp)) (looking-at "[.']."))
198 (setq cnt
(- cnt
1)))
199 (while (and (< cnt
0) (not (bobp)))
201 (while (and (not (bobp))
202 (looking-at "[.']."))
204 (setq cnt
(+ cnt
1)))
207 (defun nroff-backward-text-line (&optional cnt
)
208 "Go backward one nroff text line, skipping lines of nroff requests.
209 An argument is a repeat count; negative means move forward."
211 (nroff-forward-text-line (- cnt
)))
213 (defconst nroff-brace-table
244 (".G1" .
".G2") ; grap
249 (defun nroff-electric-newline (arg)
250 "Insert newline for nroff mode; special if electric-nroff mode.
251 In `electric-nroff-mode', if ending a line containing an nroff opening request,
252 automatically inserts the matching closing request after point."
254 (let ((completion (save-excursion
258 (<= (point) (- (point-max) 3))
259 (cdr (assoc (buffer-substring (point)
261 nroff-brace-table
)))))
262 (needs-nl (not (looking-at "[ \t]*$"))))
263 (if (null completion
)
264 (newline (prefix-numeric-value arg
))
266 (insert "\n\n" completion
)
267 (if needs-nl
(insert "\n")))
270 (define-minor-mode nroff-electric-mode
271 "Toggle `nroff-electric-newline' minor mode.
272 `nroff-electric-newline' forces Emacs to check for an nroff request at the
273 beginning of the line, and insert the matching closing request if necessary.
274 This command toggles that mode (off->on, on->off), with an argument,
275 turns it on if arg is positive, otherwise off."
277 (or (derived-mode-p 'nroff-mode
) (error "Must be in nroff mode")))
279 ;; Old names that were not namespace clean.
280 (define-obsolete-function-alias 'count-text-lines
'nroff-count-text-lines
"22.1")
281 (define-obsolete-function-alias 'forward-text-line
'nroff-forward-text-line
"22.1")
282 (define-obsolete-function-alias 'backward-text-line
'nroff-backward-text-line
"22.1")
283 (define-obsolete-function-alias 'electric-nroff-newline
'nroff-electric-newline
"22.1")
284 (define-obsolete-function-alias 'electric-nroff-mode
'nroff-electric-mode
"22.1")
286 (provide 'nroff-mode
)
288 ;; arch-tag: 6e276340-6c65-4f65-b4e3-0ca431ddfb6c
289 ;;; nroff-mode.el ends here