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- ;;; nroff-mode.el --- GNU Emacs major mode for editing nroff source
-
- ;; Copyright (C) 1985, 1986, 1994, 1995 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
- ;; Keywords: wp
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; This package is a major mode for editing nroff source code. It knows
- ;; about various nroff constructs, ms, mm, and me macros, and will fill
- ;; and indent paragraphs properly in their presence. It also includes
- ;; a command to count text lines (excluding nroff constructs), a command
- ;; to center a line, and movement commands that know how to skip macros.
-
- ;; Paragraph filling and line-counting currently don't respect comments,
- ;; as they should.
-
- ;;; Code:
-
- (defvar nroff-mode-abbrev-table nil
- "Abbrev table used while in nroff mode.")
- (define-abbrev-table 'nroff-mode-abbrev-table ())
-
- (defvar nroff-mode-map nil
- "Major mode keymap for nroff mode.")
- (if (not nroff-mode-map)
- (progn
- (setq nroff-mode-map (make-sparse-keymap))
- (define-key nroff-mode-map "\t" 'tab-to-tab-stop)
- (define-key nroff-mode-map "\es" 'center-line)
- (define-key nroff-mode-map "\e?" 'count-text-lines)
- (define-key nroff-mode-map "\n" 'electric-nroff-newline)
- (define-key nroff-mode-map "\en" 'forward-text-line)
- (define-key nroff-mode-map "\ep" 'backward-text-line)))
-
- (defvar nroff-mode-syntax-table nil
- "Syntax table used while in nroff mode.")
-
- (defvar nroff-font-lock-keywords
- (list
- ;; Directives are . or ' at start of line, followed by
- ;; optional whitespace, then command (which my be longer than
- ;; 2 characters in groff). Perhaps the arguments should be
- ;; fontified as well.
- "^[.']\\s-*\\sw+"
- ;; There are numerous groff escapes; the following get things
- ;; like \-, \(em (standard troff) and \f[bar] (groff
- ;; variants). This won't currently do groff's \A'foo' and
- ;; the like properly. One might expect it to highlight an escape's
- ;; arguments in common cases, like \f.
- (concat "\\\\" ; backslash
- "\\(" ; followed by various possibilities
- (mapconcat 'identity
- '("[f*n]*\\[.+]" ; some groff extensions
- "(.." ; two chars after (
- "[^(\"]" ; single char escape
- ) "\\|")
- "\\)")
- )
- "Font-lock highlighting control in nroff-mode.")
-
- ;;;###autoload
- (defun nroff-mode ()
- "Major mode for editing text intended for nroff to format.
- \\{nroff-mode-map}
- Turning on Nroff mode runs `text-mode-hook', then `nroff-mode-hook'.
- Also, try `nroff-electric-mode', for automatically inserting
- closing requests for requests that are used in matched pairs."
- (interactive)
- (kill-all-local-variables)
- (use-local-map nroff-mode-map)
- (setq mode-name "Nroff")
- (setq major-mode 'nroff-mode)
- (if nroff-mode-syntax-table
- ()
- (setq nroff-mode-syntax-table (copy-syntax-table text-mode-syntax-table))
- ;; " isn't given string quote syntax in text-mode but it
- ;; (arguably) should be for use round nroff arguments (with ` and
- ;; ' used otherwise).
- (modify-syntax-entry ?\" "\" 2" nroff-mode-syntax-table)
- ;; Comments are delimited by \" and newline.
- (modify-syntax-entry ?\\ "\\ 1" nroff-mode-syntax-table)
- (modify-syntax-entry ?\n "> 1" nroff-mode-syntax-table))
- (set-syntax-table nroff-mode-syntax-table)
- (make-local-variable 'font-lock-defaults)
- (setq font-lock-defaults '(nroff-font-lock-keywords nil t))
- (setq local-abbrev-table nroff-mode-abbrev-table)
- (make-local-variable 'nroff-electric-mode)
- (setq nroff-electric-mode nil)
- (make-local-variable 'outline-regexp)
- (setq outline-regexp "\\.H[ ]+[1-7]+ ")
- (make-local-variable 'outline-level)
- (setq outline-level 'nroff-outline-level)
- ;; now define a bunch of variables for use by commands in this mode
- (make-local-variable 'page-delimiter)
- (setq page-delimiter "^\\.\\(bp\\|SK\\|OP\\)")
- (make-local-variable 'paragraph-start)
- (setq paragraph-start (concat "[.']\\|" paragraph-start))
- (make-local-variable 'paragraph-separate)
- (setq paragraph-separate (concat "[.']\\|" paragraph-separate))
- ;; comment syntax added by mit-erl!gildea 18 Apr 86
- (make-local-variable 'comment-start)
- (setq comment-start "\\\" ")
- (make-local-variable 'comment-start-skip)
- (setq comment-start-skip "\\\\\"[ \t]*")
- (make-local-variable 'comment-column)
- (setq comment-column 24)
- (make-local-variable 'comment-indent-function)
- (setq comment-indent-function 'nroff-comment-indent)
- (run-hooks 'text-mode-hook 'nroff-mode-hook))
-
- (defun nroff-outline-level ()
- (save-excursion
- (looking-at outline-regexp)
- (skip-chars-forward ".H ")
- (string-to-int (buffer-substring (point) (+ 1 (point))))))
-
- ;;; Compute how much to indent a comment in nroff/troff source.
- ;;; By mit-erl!gildea April 86
- (defun nroff-comment-indent ()
- "Compute indent for an nroff/troff comment.
- Puts a full-stop before comments on a line by themselves."
- (let ((pt (point)))
- (unwind-protect
- (progn
- (skip-chars-backward " \t")
- (if (bolp)
- (progn
- (setq pt (1+ pt))
- (insert ?.)
- 1)
- (if (save-excursion
- (backward-char 1)
- (looking-at "^[.']"))
- 1
- (max comment-column
- (* 8 (/ (+ (current-column)
- 9) 8)))))) ; add 9 to ensure at least two blanks
- (goto-char pt))))
-
- (defun count-text-lines (start end &optional print)
- "Count lines in region, except for nroff request lines.
- All lines not starting with a period are counted up.
- Interactively, print result in echo area.
- Noninteractively, return number of non-request lines from START to END."
- (interactive "r\np")
- (if print
- (message "Region has %d text lines" (count-text-lines start end))
- (save-excursion
- (save-restriction
- (narrow-to-region start end)
- (goto-char (point-min))
- (- (buffer-size) (forward-text-line (buffer-size)))))))
-
- (defun forward-text-line (&optional cnt)
- "Go forward one nroff text line, skipping lines of nroff requests.
- An argument is a repeat count; if negative, move backward."
- (interactive "p")
- (if (not cnt) (setq cnt 1))
- (while (and (> cnt 0) (not (eobp)))
- (forward-line 1)
- (while (and (not (eobp)) (looking-at "[.']."))
- (forward-line 1))
- (setq cnt (- cnt 1)))
- (while (and (< cnt 0) (not (bobp)))
- (forward-line -1)
- (while (and (not (bobp))
- (looking-at "[.']."))
- (forward-line -1))
- (setq cnt (+ cnt 1)))
- cnt)
-
- (defun backward-text-line (&optional cnt)
- "Go backward one nroff text line, skipping lines of nroff requests.
- An argument is a repeat count; negative means move forward."
- (interactive "p")
- (forward-text-line (- cnt)))
-
- (defconst nroff-brace-table
- '((".(b" . ".)b")
- (".(l" . ".)l")
- (".(q" . ".)q")
- (".(c" . ".)c")
- (".(x" . ".)x")
- (".(z" . ".)z")
- (".(d" . ".)d")
- (".(f" . ".)f")
- (".LG" . ".NL")
- (".SM" . ".NL")
- (".LD" . ".DE")
- (".CD" . ".DE")
- (".BD" . ".DE")
- (".DS" . ".DE")
- (".DF" . ".DE")
- (".FS" . ".FE")
- (".KS" . ".KE")
- (".KF" . ".KE")
- (".LB" . ".LE")
- (".AL" . ".LE")
- (".BL" . ".LE")
- (".DL" . ".LE")
- (".ML" . ".LE")
- (".RL" . ".LE")
- (".VL" . ".LE")
- (".RS" . ".RE")
- (".TS" . ".TE")
- (".EQ" . ".EN")
- (".PS" . ".PE")
- (".BS" . ".BE")
- (".G1" . ".G2") ; grap
- (".na" . ".ad b")
- (".nf" . ".fi")
- (".de" . "..")))
-
- (defun electric-nroff-newline (arg)
- "Insert newline for nroff mode; special if electric-nroff mode.
- In `electric-nroff-mode', if ending a line containing an nroff opening request,
- automatically inserts the matching closing request after point."
- (interactive "P")
- (let ((completion (save-excursion
- (beginning-of-line)
- (and (null arg)
- nroff-electric-mode
- (<= (point) (- (point-max) 3))
- (cdr (assoc (buffer-substring (point)
- (+ 3 (point)))
- nroff-brace-table)))))
- (needs-nl (not (looking-at "[ \t]*$"))))
- (if (null completion)
- (newline (prefix-numeric-value arg))
- (save-excursion
- (insert "\n\n" completion)
- (if needs-nl (insert "\n")))
- (forward-char 1))))
-
- (defun electric-nroff-mode (&optional arg)
- "Toggle `nroff-electric-newline' minor mode.
- `nroff-electric-newline' forces Emacs to check for an nroff request at the
- beginning of the line, and insert the matching closing request if necessary.
- This command toggles that mode (off->on, on->off), with an argument,
- turns it on iff arg is positive, otherwise off."
- (interactive "P")
- (or (eq major-mode 'nroff-mode) (error "Must be in nroff mode"))
- (or (assq 'nroff-electric-mode minor-mode-alist)
- (setq minor-mode-alist (append minor-mode-alist
- (list '(nroff-electric-mode
- " Electric")))))
- (setq nroff-electric-mode
- (cond ((null arg) (null nroff-electric-mode))
- (t (> (prefix-numeric-value arg) 0)))))
-
- ;;; nroff-mode.el ends here
-