aboutsummaryrefslogtreecommitdiffhomepage
path: root/mmm/mmm-compat.el
blob: bb22446b8d0b6071fe6c11d286148a6ec4877fb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
;;; mmm-compat.el --- MMM Hacks for compatibility with other Emacsen

;; Copyright (C) 2000 by Michael Abraham Shulman

;; Author: Michael Abraham Shulman <viritrilbia@users.sourceforge.net>
;; Version: $Id$

;;{{{ GPL

;; This file 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.

;; This file 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 file provides a number of hacks that are necessary for MMM
;; Mode to function in different Emacsen.  MMM Mode is designed for
;; FSF Emacs 20 and 21, but these hacks usually enable it to work
;; almost perfectly in Emacs 19 and XEmacs 20 or 21.

;;; Code:

(require 'cl)

;;{{{ Emacsen Detection

(defvar mmm-xemacs (featurep 'xemacs)
  "Whether we are running XEmacs.")

;;}}}
;;{{{ Keywords (Emacs 19)

;; Emacs 19 doesn't automatically set keyword variables to themselves.
;; We shouldn't have to do any more than these, since CL automatically
;; defines all keywords used for function arguments.
(defvar mmm-keywords-used
  '(:group :regexp :region :function :insert :classes :private)
  "List of extra keywords used by MMM Mode.")

(dolist (keyword mmm-keywords-used)
  (set keyword keyword))

;;}}}
;;{{{ Customization (Emacs 19) 

(condition-case ()
    (require 'custom)
  (error nil))

(unless (and (featurep 'custom)
             (fboundp 'custom-declare-variable))
  (defmacro defgroup (&rest args)
    nil)
  ;; da: backquote syntax updated, so not Emacs <19.29 compatible
  (defmacro defface (var values doc &rest args)
    `(make-face (quote ,var)))
  (defmacro defcustom (var value doc &rest args) 
    `(defvar ,var ,value ,doc)))

;;}}}
;;{{{ Regexp-Opt (Emacs 19)

(condition-case ()
    (require 'regexp-opt)
  (error nil))

(unless (and (featurep 'regexp-opt)
             (fboundp 'regexp-opt))
  ;; No regexp-opt; create one
  (defun regexp-opt (strings &optional paren)
    (concat (if paren "\\(" "")
            (mapconcat 'regexp-quote strings "\\|")
            (if paren "\\)" ""))))

;;}}}
;;{{{ Regexp-Opt (XEmacs)

(defmacro mmm-regexp-opt (strings paren)
  "Act like FSF Emacs' `regexp-opt', whichever Emacs we're in.
XEmacs' `regexp-opt' requires an extra parameter to do grouping."
  (if (featurep 'xemacs)
      `(regexp-opt ,strings ,paren t)
    `(regexp-opt ,strings ,paren)))

;;}}}
;;{{{ Overlays (XEmacs)

;; The main thing we use from FSF Emacs that XEmacs doesn't support
;; are overlays. XEmacs uses extents instead, but comes with a package
;; to emulate overlays.
(when mmm-xemacs
  ;; This does almost everything we need.
  (require 'overlay))

;; We also use a couple "special" overlay properties which have
;; different names for XEmacs extents.
(defvar mmm-evaporate-property
  (if (featurep 'xemacs) 'detachable 'evaporate)
  "The name of the overlay property controlling evaporation.")

;; We don't use this any more, since its behavior is different in FSF
;; and XEmacs: in the one it replaces the buffer's local map, but in
;; the other it gets stacked on top of it. Instead we just set the
;; buffer's local map temporarily.
;;;(defvar mmm-keymap-property
;;;  (if (featurep 'xemacs) 'keymap 'local-map)
;;;  "The name of the overlay property controlling keymaps.")

;;}}}
;;{{{ Keymaps and Events (XEmacs)

;; In XEmacs, keymaps are a primitive type, while in FSF Emacs, they
;; are a list whose car is the symbol `keymap'. Among other things,
;; this means that they handle default bindings differently.
(defmacro mmm-set-keymap-default (keymap binding)
  (if (featurep 'xemacs)
      `(set-keymap-default-binding ,keymap ,binding)
    `(define-key ,keymap [t] ,binding)))

;; In XEmacs, events are a primitive type, while in FSF Emacs, they
;; are represented by characters or vectors. We treat them as vectors.
;; We can use `event-modifiers' in both Emacsen to extract the
;; modifiers, but the function to extract the basic key is different.
(defmacro mmm-event-key (event)
  (if (featurep 'xemacs)
      `(event-key ,event)
    `(event-basic-type ,event)))

;;}}}
;;{{{ Skeleton (XEmacs)

;; XEmacs' `skeleton' package doesn't provide `@' to record positions.
(defvar skeleton-positions ())
(defun mmm-fixup-skeleton ()
  "Add `@' to `skeleton-further-elements' if XEmacs and not there.
This makes `@' in skeletons act approximately like it does in FSF."
  (and (featurep 'xemacs)
       (defvar skeleton-further-elements ())
       (not (assoc '@ skeleton-further-elements))
       (add-to-list 'skeleton-further-elements
                    '(@ ''(push (point) skeleton-positions)))))

;;}}}
;;{{{ Make Temp Buffers (XEmacs)

(defmacro mmm-make-temp-buffer (buffer name)
  "Return a buffer called NAME including the text of BUFFER.
This text should not be modified."
  (if (fboundp 'make-indirect-buffer)
      `(make-indirect-buffer ,buffer ,name)
    `(save-excursion
       (set-buffer (get-buffer-create ,name))
       (insert-buffer ,buffer)
       (current-buffer))))

;;}}}
;;{{{ Font Lock Available (Emacs w/o X)

(defvar mmm-font-lock-available-p (or window-system mmm-xemacs)
  "Whether font-locking is available.
Emacs 19 and 20 only provide font-lock with a window system in use.")

;;}}}
;;{{{ Font Lock Defaults (XEmacs)

(defmacro mmm-set-font-lock-defaults ()
  "Set font-lock defaults without trying to turn font-lock on.
In XEmacs, `font-lock-set-defaults' calls `font-lock-set-defaults-1'
to do the real work but then `turn-on-font-lock', which in turn calls
`font-lock-mode', which unsets the defaults if running in a hidden
buffer \(name begins with a space).  So in XEmacs, we just call
`font-lock-set-defaults-1' directly."
  (if mmm-xemacs
      `(font-lock-set-defaults-1)
    `(font-lock-set-defaults)))

;;}}}

(provide 'mmm-compat)

;;; mmm-compat.el ends here