lisp/medit.el

   1 ;;; medit.el --- front-end to the MEDIT package for editing MDL
   2
   3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
   4
   5 ;; Author: K. Shane Hartman
   6 ;; Maintainer: FSF
   7 ;; Keywords: languages
   8
   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
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  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
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; >> This package depends on two MDL packages: MEDIT and FORKS which
  28 ;; >> can be obtained from the public (network) library at mit-ajax.
  29
  30 ;;; Code:
  31
  32 (require 'mim-mode)
  33
  34 (defconst medit-zap-file (concat "/tmp/" (user-login-name) ".medit.mud")
  35   "File name for data sent to MDL by Medit.")
  36 (defconst medit-buffer "*MEDIT*"
  37   "Name of buffer in which Medit accumulates data to send to MDL.")
  38 (defconst medit-save-files t
  39   "If non-nil, Medit offers to save files on return to MDL.")
  40
  41 (defun medit-save-define ()
  42   "Mark the previous or surrounding toplevel object to be sent back to MDL."
  43   (interactive)
  44   (save-excursion
  45       (beginning-of-DEFINE)
  46       (let ((start (point)))
  47         (forward-mim-object 1)
  48         (append-to-buffer medit-buffer start (point))
  49         (goto-char start)
  50         (message (buffer-substring start (progn (end-of-line) (point)))))))
  51
  52 (defun medit-save-region (start end)
  53   "Mark the current region to be sent to back to MDL."
  54   (interactive "r")
  55   (append-to-buffer medit-buffer start end)
  56   (message "Current region saved for MDL."))
  57
  58 (defun medit-save-buffer ()
  59   "Mark the current buffer to be sent back to MDL."
  60   (interactive)
  61   (append-to-buffer medit-buffer (point-min) (point-max))
  62   (message "Current buffer saved for MDL."))
  63
  64 (defun medit-zap-define-to-mdl ()
  65   "Return to MDL with surrounding or previous toplevel MDL object."
  66   (interactive)
  67   (medit-save-define)
  68   (medit-goto-mdl))
  69
  70 (defun medit-zap-region-mdl (start end)
  71   "Return to MDL with current region."
  72   (interactive)
  73   (medit-save-region start end)
  74   (medit-goto-mdl))
  75
  76 (defun medit-zap-buffer ()
  77   "Return to MDL with current buffer."
  78   (interactive)
  79   (medit-save-buffer)
  80   (medit-goto-mdl))
  81
  82 (defun medit-goto-mdl ()
  83   "Return from Emacs to superior MDL, sending saved code.
  84 Optionally, offers to save changed files."
  85   (interactive)
  86   (let ((buffer (get-buffer medit-buffer)))
  87   (if buffer
  88       (save-excursion
  89         (set-buffer buffer)
  90         (if (buffer-modified-p buffer)
  91             (write-region (point-min) (point-max) medit-zap-file))
  92         (set-buffer-modified-p nil)
  93         (erase-buffer)))
  94   (if medit-save-files (save-some-buffers))
  95   ;; Note could handle parallel fork by giving argument "%xmdl".  Then
  96   ;; mdl would have to invoke with "%emacs".
  97   (suspend-emacs)))
  98
  99 (defconst medit-mode-map nil)
 100 (if (not medit-mode-map)
 101     (progn
 102       (setq medit-mode-map (copy-keymap mim-mode-map))
 103       (define-key medit-mode-map "\e\z" 'medit-save-define)
 104       (define-key medit-mode-map "\e\^z" 'medit-save-buffer)
 105       (define-key medit-mode-map "\^xz" 'medit-goto-mdl)
 106       (define-key medit-mode-map "\^xs" 'medit-zap-buffer)))
 107
 108 (defconst medit-mode-hook (and (boundp 'mim-mode-hook) mim-mode-hook) "")
 109 (setq mim-mode-hook '(lambda () (medit-mode)))
 110
 111 (defun medit-mode (&optional state)
 112   "Major mode for editing text and returning it to a superior MDL.
 113 Like Mim mode, plus these special commands:
 114 \\{medit-mode-map}"
 115   (interactive)
 116   (use-local-map medit-mode-map)
 117   (run-hooks 'medit-mode-hook)
 118   (setq major-mode 'medit-mode)
 119   (setq mode-name "Medit"))
 120
 121 (mim-mode)
 122
 123 ;;; medit.el ends here