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;;; m4-mode.el --- m4 code editing commands for Emacs -*- lexical-binding:t -*-
;; Copyright (C) 1996-1997, 2001-2021 Free Software Foundation, Inc.
;; Author: Andrew Csillag <drew@thecsillags.com>
;; Keywords: languages, faces
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; A smart editing mode for m4 macro definitions. It seems to have most of the
;; syntax right (sexp motion commands work, but function motion commands don't).
;; It also sets the font-lock syntax stuff for colorization
;; To Do's:
;; * want to make m4-m4-(buffer|region) look sorta like M-x compile look&feel ?
;; * sexp motion commands don't seem to work right
;;; Thanks:
;;; to Akim Demaille and Terry Jones for the bug reports
;;; to Simon Marshall for the regexp tip
;;; to Martin Buchholz for some general fixes
;;; Code:
(defgroup m4 nil
"m4 code editing commands for Emacs."
:link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
:prefix "m4-"
:group 'languages)
(defcustom m4-program "m4"
"File name of the m4 executable.
If m4 is not in your PATH, set this to an absolute file name."
:version "24.4"
:type 'file)
;;options to m4
(defcustom m4-program-options nil
"Options to pass to `m4-program'."
:type '(repeat string))
;;to use --prefix-builtins, you can use
;;(defconst m4-program-options '("-P"))
;;or
;;(defconst m4-program-options '("--prefix-builtins"))
(defvar m4-font-lock-keywords
'(("\\(\\_<\\(m4_\\)?dnl\\_>\\).*$" (0 font-lock-comment-face t))
("\\$[*#@0-9]" . font-lock-variable-name-face)
("\\$@" . font-lock-variable-name-face)
("\\$\\*" . font-lock-variable-name-face)
("\\_<\\(m4_\\)?\\(builtin\\|change\\(com\\|quote\\|word\\)\\|d\\(e\\(bug\\(file\\|mode\\)\\|cr\\|f\\(ine\\|n\\)\\)\\|iv\\(ert\\|num\\)\\|nl\\|umpdef\\)\\|e\\(rrprint\\|syscmd\\|val\\)\\|f\\(ile\\|ormat\\)\\|gnu\\|i\\(f\\(def\\|else\\)\\|n\\(c\\(lude\\|r\\)\\|d\\(ex\\|ir\\)\\)\\)\\|l\\(en\\|ine\\)\\|m\\(4\\(exit\\|wrap\\)\\|aketemp\\)\\|p\\(atsubst\\|opdef\\|ushdef\\)\\|regexp\\|s\\(hift\\|include\\|ubstr\\|ys\\(cmd\\|val\\)\\)\\|tra\\(ceo\\(ff\\|n\\)\\|nslit\\)\\|un\\(d\\(efine\\|ivert\\)\\|ix\\)\\)\\_>" . font-lock-keyword-face))
"Default `font-lock-keywords' for M4 mode.")
(defcustom m4-mode-hook nil
"Hook called by `m4-mode'."
:type 'hook)
;;this may still need some work
(defvar m4-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?` "('" table)
(modify-syntax-entry ?' ")`" table)
(modify-syntax-entry ?# "<\n" table)
(modify-syntax-entry ?\n ">#" table)
(modify-syntax-entry ?{ "." table)
(modify-syntax-entry ?} "." table)
(modify-syntax-entry ?_ "_" table)
(modify-syntax-entry ?* "." table)
(modify-syntax-entry ?\" "." table)
table)
"Syntax table used while in `m4-mode'.")
(defun m4--quoted-p (pos)
"Return non-nil if POS is inside a quoted string."
(let ((quoted nil))
(dolist (o (nth 9 (save-excursion (syntax-ppss pos))))
(if (eq (char-after o) ?\`) (setq quoted t)))
quoted))
(defconst m4-syntax-propertize
(syntax-propertize-rules
("#" (0 (when (m4--quoted-p (match-beginning 0))
(string-to-syntax "."))))))
(defvar m4-mode-map
(let ((map (make-sparse-keymap))
(menu-map (make-sparse-keymap)))
(define-key map "\C-c\C-b" 'm4-m4-buffer)
(define-key map "\C-c\C-r" 'm4-m4-region)
(define-key map "\C-c\C-c" 'comment-region)
(define-key map [menu-bar m4-mode] (cons "M4" menu-map))
(define-key menu-map [m4c]
'(menu-item "Comment Region" comment-region
:help "Comment Region"))
(define-key menu-map [m4b]
'(menu-item "M4 Buffer" m4-m4-buffer
:help "Send contents of the current buffer to m4"))
(define-key menu-map [m4r]
'(menu-item "M4 Region" m4-m4-region
:help "Send contents of the current region to m4"))
map))
(defun m4-m4-buffer ()
"Send contents of the current buffer to m4."
(interactive)
(shell-command-on-region
(point-min) (point-max)
(mapconcat #'identity (cons m4-program m4-program-options) "\s")
"*m4-output*" nil)
(switch-to-buffer-other-window "*m4-output*"))
(defun m4-m4-region ()
"Send contents of the current region to m4."
(interactive)
(shell-command-on-region
(point) (mark)
(mapconcat #'identity (cons m4-program m4-program-options) "\s")
"*m4-output*" nil)
(switch-to-buffer-other-window "*m4-output*"))
(defun m4-current-defun-name ()
"Return the name of the M4 function at point, or nil."
(save-excursion
(if (re-search-backward
"^\\(\\(m4_\\)?define\\|A._DEFUN\\)(\\[?\\([A-Za-z0-9_]+\\)" nil t)
(match-string-no-properties 3))))
;;;###autoload
(define-derived-mode m4-mode prog-mode "m4"
"A major mode to edit m4 macro files."
(setq-local comment-start "#")
(setq-local parse-sexp-ignore-comments t)
(setq-local add-log-current-defun-function #'m4-current-defun-name)
(setq-local syntax-propertize-function m4-syntax-propertize)
(setq-local font-lock-defaults '(m4-font-lock-keywords nil)))
(provide 'm4-mode)
;;stuff to play with for debugging
;(char-to-string (char-syntax ?`))
;;;how I generate the nasty looking regexps at the top
;;;(make-regexp '("builtin" "changecom" "changequote" "changeword" "debugfile"
;;; "debugmode" "decr" "define" "defn" "divert" "divnum" "dnl"
;;; "dumpdef" "errprint" "esyscmd" "eval" "file" "format" "gnu"
;;; "ifdef" "ifelse" "include" "incr" "index" "indir" "len" "line"
;;; "m4exit" "m4wrap" "maketemp" "patsubst" "popdef" "pushdef" "regexp"
;;; "shift" "sinclude" "substr" "syscmd" "sysval" "traceoff" "traceon"
;;; "translit" "undefine" "undivert" "unix"))
;;;(make-regexp '("m4_builtin" "m4_changecom" "m4_changequote" "m4_changeword"
;;; "m4_debugfile" "m4_debugmode" "m4_decr" "m4_define" "m4_defn"
;;; "m4_divert" "m4_divnum" "m4_dnl" "m4_dumpdef" "m4_errprint"
;;; "m4_esyscmd" "m4_eval" "m4_file" "m4_format" "m4_ifdef" "m4_ifelse"
;;; "m4_include" "m4_incr" "m4_index" "m4_indir" "m4_len" "m4_line"
;;; "m4_m4exit" "m4_m4wrap" "m4_maketemp" "m4_patsubst" "m4_popdef"
;;; "m4_pushdef" "m4_regexp" "m4_shift" "m4_sinclude" "m4_substr"
;;; "m4_syscmd" "m4_sysval" "m4_traceoff" "m4_traceon" "m4_translit"
;;; "m4_m4_undefine" "m4_undivert"))
;;; m4-mode.el ends here
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