1 ;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source
3 ;; Copyright (C) 1985, 1986 Free Software Foundation, Inc.
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to
22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 ;; This package is a major mode for editing nroff source code. It knows
27 ;; about various nroff constructs, ms, mm, and me macros, and will fill
28 ;; and indent paragraphs properly in their presence. It also includes
29 ;; a command to count text lines (excluding nroff constructs), a command
30 ;; to center a line, and movement commands that know how to skip macros.
34 (defvar nroff-mode-abbrev-table nil
35 "Abbrev table used while in nroff mode.")
37 (defvar nroff-mode-map nil
38 "Major mode keymap for nroff mode.")
39 (if (not nroff-mode-map
)
41 (setq nroff-mode-map
(make-sparse-keymap))
42 (define-key nroff-mode-map
"\t" 'tab-to-tab-stop
)
43 (define-key nroff-mode-map
"\es" 'center-line
)
44 (define-key nroff-mode-map
"\e?" 'count-text-lines
)
45 (define-key nroff-mode-map
"\n" 'electric-nroff-newline
)
46 (define-key nroff-mode-map
"\en" 'forward-text-line
)
47 (define-key nroff-mode-map
"\ep" 'backward-text-line
)))
51 "Major mode for editing text intended for nroff to format.
53 Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'.
54 Also, try `nroff-electric-mode', for automatically inserting
55 closing requests for requests that are used in matched pairs."
57 (kill-all-local-variables)
58 (use-local-map nroff-mode-map
)
59 (setq mode-name
"Nroff")
60 (setq major-mode
'nroff-mode
)
61 (set-syntax-table text-mode-syntax-table
)
62 (setq local-abbrev-table nroff-mode-abbrev-table
)
63 (make-local-variable 'nroff-electric-mode
)
64 ;; now define a bunch of variables for use by commands in this mode
65 (make-local-variable 'page-delimiter
)
66 (setq page-delimiter
"^\\.\\(bp\\|SK\\|OP\\)")
67 (make-local-variable 'paragraph-start
)
68 (setq paragraph-start
(concat "^[.']\\|" paragraph-start
))
69 (make-local-variable 'paragraph-separate
)
70 (setq paragraph-separate
(concat "^[.']\\|" paragraph-separate
))
71 ;; comment syntax added by mit-erl!gildea 18 Apr 86
72 (make-local-variable 'comment-start
)
73 (setq comment-start
"\\\" ")
74 (make-local-variable 'comment-start-skip
)
75 (setq comment-start-skip
"\\\\\"[ \t]*")
76 (make-local-variable 'comment-column
)
77 (setq comment-column
24)
78 (make-local-variable 'comment-indent-function
)
79 (setq comment-indent-function
'nroff-comment-indent
)
80 (run-hooks 'text-mode-hook
'nroff-mode-hook
))
82 ;;; Compute how much to indent a comment in nroff/troff source.
83 ;;; By mit-erl!gildea April 86
84 (defun nroff-comment-indent ()
85 "Compute indent for an nroff/troff comment.
86 Puts a full-stop before comments on a line by themselves."
90 (skip-chars-backward " \t")
101 (* 8 (/ (+ (current-column)
102 9) 8)))))) ; add 9 to ensure at least two blanks
105 (defun count-text-lines (start end
&optional print
)
106 "Count lines in region, except for nroff request lines.
107 All lines not starting with a period are counted up.
108 Interactively, print result in echo area.
109 Noninteractively, return number of non-request lines from START to END."
112 (message "Region has %d text lines" (count-text-lines start end
))
115 (narrow-to-region start end
)
116 (goto-char (point-min))
117 (- (buffer-size) (forward-text-line (buffer-size)))))))
119 (defun forward-text-line (&optional cnt
)
120 "Go forward one nroff text line, skipping lines of nroff requests.
121 An argument is a repeat count; if negative, move backward."
123 (if (not cnt
) (setq cnt
1))
124 (while (and (> cnt
0) (not (eobp)))
126 (while (and (not (eobp)) (looking-at "[.']."))
128 (setq cnt
(- cnt
1)))
129 (while (and (< cnt
0) (not (bobp)))
131 (while (and (not (bobp))
132 (looking-at "[.']."))
134 (setq cnt
(+ cnt
1)))
137 (defun backward-text-line (&optional cnt
)
138 "Go backward one nroff text line, skipping lines of nroff requests.
139 An argument is a repeat count; negative means move forward."
141 (forward-text-line (- cnt
)))
143 (defconst nroff-brace-table
174 (".G1" .
".G2") ; grap
179 (defun electric-nroff-newline (arg)
180 "Insert newline for nroff mode; special if electric-nroff mode.
181 In `electric-nroff-mode', if ending a line containing an nroff opening request,
182 automatically inserts the matching closing request after point."
184 (let ((completion (save-excursion
188 (<= (point) (- (point-max) 3))
189 (cdr (assoc (buffer-substring (point)
191 nroff-brace-table
)))))
192 (needs-nl (not (looking-at "[ \t]*$"))))
193 (if (null completion
)
194 (newline (prefix-numeric-value arg
))
196 (insert "\n\n" completion
)
197 (if needs-nl
(insert "\n")))
200 (defun electric-nroff-mode (&optional arg
)
201 "Toggle `nroff-electric-newline' minor mode.
202 `nroff-electric-newline' forces Emacs to check for an nroff request at the
203 beginning of the line, and insert the matching closing request if necessary.
204 This command toggles that mode (off->on, on->off), with an argument,
205 turns it on iff arg is positive, otherwise off."
207 (or (eq major-mode
'nroff-mode
) (error "Must be in nroff mode"))
208 (or (assq 'nroff-electric-mode minor-mode-alist
)
209 (setq minor-mode-alist
(append minor-mode-alist
210 (list '(nroff-electric-mode
212 (setq nroff-electric-mode
213 (cond ((null arg
) (null nroff-electric-mode
))
214 (t (> (prefix-numeric-value arg
) 0)))))
216 ;;; nroff-mode.el ends here