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6594deb0 | 1 | ;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source |
4821e2af | 2 | |
3731a850 | 3 | ;; Copyright (C) 1985, 1986, 1994, 1995, 1997, 2001, 2002, 2003, |
12dc447f | 4 | ;; 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
9750e079 | 5 | |
4821e2af | 6 | ;; Maintainer: FSF |
d7b4d18f | 7 | ;; Keywords: wp |
4821e2af | 8 | |
a2535589 JA |
9 | ;; This file is part of GNU Emacs. |
10 | ||
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 | |
5a9dffec | 13 | ;; the Free Software Foundation; either version 3, or (at your option) |
a2535589 JA |
14 | ;; any later version. |
15 | ||
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. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
4fc5845f LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
a2535589 | 25 | |
edbd2f74 ER |
26 | ;;; Commentary: |
27 | ||
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. | |
33 | ||
878c1d73 RS |
34 | ;; Paragraph filling and line-counting currently don't respect comments, |
35 | ;; as they should. | |
36 | ||
4821e2af ER |
37 | ;;; Code: |
38 | ||
e4550233 RS |
39 | (defgroup nroff nil |
40 | "Nroff mode." | |
8ec3bce0 | 41 | :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces) |
e8955f1d | 42 | :group 'wp |
e4550233 RS |
43 | :prefix "nroff-") |
44 | ||
ea37fbb8 | 45 | |
e4550233 | 46 | (defcustom nroff-electric-mode nil |
ea37fbb8 | 47 | "Non-nil means automatically closing requests when you insert an open." |
e4550233 RS |
48 | :group 'nroff |
49 | :type 'boolean) | |
934b4e4f | 50 | |
74ac2467 GM |
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) | |
ea37fbb8 SM |
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) | |
74ac2467 GM |
59 | map) |
60 | "Major mode keymap for `nroff-mode'.") | |
61 | ||
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 | |
66 | ;; ' used otherwise). | |
67 | (modify-syntax-entry ?\" "\" 2" st) | |
68 | ;; Comments are delimited by \" and newline. | |
69 | (modify-syntax-entry ?\\ "\\ 1" st) | |
ea37fbb8 | 70 | (modify-syntax-entry ?\n ">" st) |
74ac2467 GM |
71 | st) |
72 | "Syntax table used while in `nroff-mode'.") | |
878c1d73 | 73 | |
500acb79 DL |
74 | (defvar nroff-imenu-expression |
75 | ;; man headers: | |
76 | '((nil "^\\.SH \"?\\([^\"\n]*\\)\"?$" 1))) | |
77 | ||
e4550233 | 78 | (defcustom nroff-font-lock-keywords |
878c1d73 RS |
79 | (list |
80 | ;; Directives are . or ' at start of line, followed by | |
81 | ;; optional whitespace, then command (which my be longer than | |
82 | ;; 2 characters in groff). Perhaps the arguments should be | |
83 | ;; fontified as well. | |
84 | "^[.']\\s-*\\sw+" | |
85 | ;; There are numerous groff escapes; the following get things | |
86 | ;; like \-, \(em (standard troff) and \f[bar] (groff | |
87 | ;; variants). This won't currently do groff's \A'foo' and | |
88 | ;; the like properly. One might expect it to highlight an escape's | |
89 | ;; arguments in common cases, like \f. | |
cb8ec72a WL |
90 | (concat "\\\\" ; backslash |
91 | "\\(" ; followed by various possibilities | |
92 | (mapconcat 'identity | |
93 | '("[f*n]*\\[.+?]" ; some groff extensions | |
94 | "(.." ; two chars after ( | |
95 | "[^(\"]" ; single char escape | |
96 | ) "\\|") | |
97 | "\\)") | |
878c1d73 | 98 | ) |
74ac2467 | 99 | "Font-lock highlighting control in `nroff-mode'." |
e4550233 RS |
100 | :group 'nroff |
101 | :type '(repeat regexp)) | |
878c1d73 | 102 | |
500acb79 DL |
103 | (defcustom nroff-mode-hook nil |
104 | "Hook run by function `nroff-mode'." | |
105 | :type 'hook | |
106 | :group 'nroff) | |
107 | ||
6594deb0 | 108 | ;;;###autoload |
74ac2467 | 109 | (define-derived-mode nroff-mode text-mode "Nroff" |
a2535589 JA |
110 | "Major mode for editing text intended for nroff to format. |
111 | \\{nroff-mode-map} | |
6d1f885f BP |
112 | Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'. |
113 | Also, try `nroff-electric-mode', for automatically inserting | |
a2535589 | 114 | closing requests for requests that are used in matched pairs." |
74ac2467 GM |
115 | (set (make-local-variable 'font-lock-defaults) |
116 | ;; SYNTAX-BEGIN is set to backward-paragraph to avoid slow-down | |
117 | ;; near the end of large buffers due to searching to buffer's | |
118 | ;; beginning. | |
119 | '(nroff-font-lock-keywords nil t nil backward-paragraph)) | |
74ac2467 GM |
120 | (set (make-local-variable 'outline-regexp) "\\.H[ ]+[1-7]+ ") |
121 | (set (make-local-variable 'outline-level) 'nroff-outline-level) | |
a2535589 | 122 | ;; now define a bunch of variables for use by commands in this mode |
74ac2467 GM |
123 | (set (make-local-variable 'page-delimiter) "^\\.\\(bp\\|SK\\|OP\\)") |
124 | (set (make-local-variable 'paragraph-start) | |
125 | (concat "[.']\\|" paragraph-start)) | |
126 | (set (make-local-variable 'paragraph-separate) | |
127 | (concat "[.']\\|" paragraph-separate)) | |
a2535589 | 128 | ;; comment syntax added by mit-erl!gildea 18 Apr 86 |
74ac2467 GM |
129 | (set (make-local-variable 'comment-start) "\\\" ") |
130 | (set (make-local-variable 'comment-start-skip) "\\\\\"[ \t]*") | |
131 | (set (make-local-variable 'comment-column) 24) | |
500acb79 | 132 | (set (make-local-variable 'comment-indent-function) 'nroff-comment-indent) |
31cf791e | 133 | (set (make-local-variable 'indent-line-function) 'nroff-indent-line-function) |
500acb79 | 134 | (set (make-local-variable 'imenu-generic-expression) nroff-imenu-expression)) |
a2535589 | 135 | |
a6234246 RS |
136 | (defun nroff-outline-level () |
137 | (save-excursion | |
138 | (looking-at outline-regexp) | |
139 | (skip-chars-forward ".H ") | |
027a4b6b | 140 | (string-to-number (buffer-substring (point) (+ 1 (point)))))) |
a6234246 | 141 | |
ea37fbb8 SM |
142 | ;; Compute how much to indent a comment in nroff/troff source. |
143 | ;; By mit-erl!gildea April 86 | |
a2535589 JA |
144 | (defun nroff-comment-indent () |
145 | "Compute indent for an nroff/troff comment. | |
146 | Puts a full-stop before comments on a line by themselves." | |
147 | (let ((pt (point))) | |
148 | (unwind-protect | |
149 | (progn | |
150 | (skip-chars-backward " \t") | |
151 | (if (bolp) | |
152 | (progn | |
153 | (setq pt (1+ pt)) | |
154 | (insert ?.) | |
155 | 1) | |
156 | (if (save-excursion | |
157 | (backward-char 1) | |
158 | (looking-at "^[.']")) | |
159 | 1 | |
160 | (max comment-column | |
161 | (* 8 (/ (+ (current-column) | |
162 | 9) 8)))))) ; add 9 to ensure at least two blanks | |
163 | (goto-char pt)))) | |
164 | ||
31cf791e GM |
165 | ;; All this does is insert a "." at the start of comment-lines, |
166 | ;; for the sake of comment-dwim adding a new comment on an empty line. | |
167 | ;; Hack! The right fix probably involves ;; comment-insert-comment-function, | |
168 | ;; but comment-dwim does not call that for the empty line case. | |
169 | ;; http://lists.gnu.org/archive/html/emacs-devel/2007-10/msg01869.html | |
170 | (defun nroff-indent-line-function () | |
171 | "Function for `indent-line-function' in `nroff-mode'." | |
172 | (save-excursion | |
173 | (forward-line 0) | |
174 | (when (looking-at "[ \t]*\\\\\"[ \t]*") ; \# does not need this | |
175 | (delete-horizontal-space) | |
176 | (insert ?.)))) | |
177 | ||
ea37fbb8 | 178 | (defun nroff-count-text-lines (start end &optional print) |
a2535589 JA |
179 | "Count lines in region, except for nroff request lines. |
180 | All lines not starting with a period are counted up. | |
181 | Interactively, print result in echo area. | |
182 | Noninteractively, return number of non-request lines from START to END." | |
183 | (interactive "r\np") | |
184 | (if print | |
ea37fbb8 | 185 | (message "Region has %d text lines" (nroff-count-text-lines start end)) |
a2535589 JA |
186 | (save-excursion |
187 | (save-restriction | |
188 | (narrow-to-region start end) | |
189 | (goto-char (point-min)) | |
31cf791e | 190 | (- (buffer-size) (nroff-forward-text-line (buffer-size))))))) |
a2535589 | 191 | |
ea37fbb8 | 192 | (defun nroff-forward-text-line (&optional cnt) |
a2535589 JA |
193 | "Go forward one nroff text line, skipping lines of nroff requests. |
194 | An argument is a repeat count; if negative, move backward." | |
195 | (interactive "p") | |
196 | (if (not cnt) (setq cnt 1)) | |
197 | (while (and (> cnt 0) (not (eobp))) | |
198 | (forward-line 1) | |
199 | (while (and (not (eobp)) (looking-at "[.'].")) | |
200 | (forward-line 1)) | |
201 | (setq cnt (- cnt 1))) | |
202 | (while (and (< cnt 0) (not (bobp))) | |
203 | (forward-line -1) | |
204 | (while (and (not (bobp)) | |
205 | (looking-at "[.'].")) | |
206 | (forward-line -1)) | |
207 | (setq cnt (+ cnt 1))) | |
208 | cnt) | |
209 | ||
ea37fbb8 | 210 | (defun nroff-backward-text-line (&optional cnt) |
a2535589 JA |
211 | "Go backward one nroff text line, skipping lines of nroff requests. |
212 | An argument is a repeat count; negative means move forward." | |
213 | (interactive "p") | |
ea37fbb8 | 214 | (nroff-forward-text-line (- cnt))) |
a2535589 JA |
215 | |
216 | (defconst nroff-brace-table | |
217 | '((".(b" . ".)b") | |
218 | (".(l" . ".)l") | |
219 | (".(q" . ".)q") | |
220 | (".(c" . ".)c") | |
221 | (".(x" . ".)x") | |
222 | (".(z" . ".)z") | |
223 | (".(d" . ".)d") | |
224 | (".(f" . ".)f") | |
225 | (".LG" . ".NL") | |
226 | (".SM" . ".NL") | |
227 | (".LD" . ".DE") | |
228 | (".CD" . ".DE") | |
229 | (".BD" . ".DE") | |
230 | (".DS" . ".DE") | |
231 | (".DF" . ".DE") | |
232 | (".FS" . ".FE") | |
233 | (".KS" . ".KE") | |
234 | (".KF" . ".KE") | |
235 | (".LB" . ".LE") | |
236 | (".AL" . ".LE") | |
237 | (".BL" . ".LE") | |
238 | (".DL" . ".LE") | |
239 | (".ML" . ".LE") | |
240 | (".RL" . ".LE") | |
241 | (".VL" . ".LE") | |
242 | (".RS" . ".RE") | |
243 | (".TS" . ".TE") | |
244 | (".EQ" . ".EN") | |
245 | (".PS" . ".PE") | |
246 | (".BS" . ".BE") | |
247 | (".G1" . ".G2") ; grap | |
248 | (".na" . ".ad b") | |
249 | (".nf" . ".fi") | |
250 | (".de" . ".."))) | |
251 | ||
ea37fbb8 | 252 | (defun nroff-electric-newline (arg) |
a2535589 | 253 | "Insert newline for nroff mode; special if electric-nroff mode. |
6d1f885f | 254 | In `electric-nroff-mode', if ending a line containing an nroff opening request, |
a2535589 JA |
255 | automatically inserts the matching closing request after point." |
256 | (interactive "P") | |
257 | (let ((completion (save-excursion | |
258 | (beginning-of-line) | |
259 | (and (null arg) | |
260 | nroff-electric-mode | |
261 | (<= (point) (- (point-max) 3)) | |
262 | (cdr (assoc (buffer-substring (point) | |
263 | (+ 3 (point))) | |
264 | nroff-brace-table))))) | |
265 | (needs-nl (not (looking-at "[ \t]*$")))) | |
266 | (if (null completion) | |
267 | (newline (prefix-numeric-value arg)) | |
268 | (save-excursion | |
269 | (insert "\n\n" completion) | |
270 | (if needs-nl (insert "\n"))) | |
271 | (forward-char 1)))) | |
272 | ||
ea37fbb8 | 273 | (define-minor-mode nroff-electric-mode |
6d1f885f BP |
274 | "Toggle `nroff-electric-newline' minor mode. |
275 | `nroff-electric-newline' forces Emacs to check for an nroff request at the | |
276 | beginning of the line, and insert the matching closing request if necessary. | |
277 | This command toggles that mode (off->on, on->off), with an argument, | |
3ecd3a56 | 278 | turns it on if arg is positive, otherwise off." |
ea37fbb8 SM |
279 | :lighter " Electric" |
280 | (or (derived-mode-p 'nroff-mode) (error "Must be in nroff mode"))) | |
281 | ||
282 | ;; Old names that were not namespace clean. | |
283 | (define-obsolete-function-alias 'count-text-lines 'nroff-count-text-lines "22.1") | |
284 | (define-obsolete-function-alias 'forward-text-line 'nroff-forward-text-line "22.1") | |
285 | (define-obsolete-function-alias 'backward-text-line 'nroff-backward-text-line "22.1") | |
286 | (define-obsolete-function-alias 'electric-nroff-newline 'nroff-electric-newline "22.1") | |
287 | (define-obsolete-function-alias 'electric-nroff-mode 'nroff-electric-mode "22.1") | |
a2535589 | 288 | |
896546cd RS |
289 | (provide 'nroff-mode) |
290 | ||
ea37fbb8 | 291 | ;; arch-tag: 6e276340-6c65-4f65-b4e3-0ca431ddfb6c |
6594deb0 | 292 | ;;; nroff-mode.el ends here |