summaryrefslogtreecommitdiff
path: root/lisp/term/pc-win.el
blob: d9d4e3851fe82eb2fa06c5cd0d227069d0a2ff27 (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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
;;; pc-win.el --- setup support for `PC windows' (whatever that is)

;; Copyright (C) 1994, 1996, 1997, 1999, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

;; Author: Morten Welinder <terra@diku.dk>
;; Maintainer: FSF

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This file is preloaded into Emacs by loadup.el.  The functions in
;; this file are then called during startup from startup.el.  This
;; means that just loading this file should not have any side effects
;; besides defining functions and variables, and in particular should
;; NOT initialize any window systems.

;; The main entry points to this file's features are msdos-handle-args,
;; msdos-create-frame-with-faces, msdos-initialize-window-system,
;; terminal-init-internal.  The last one is not supposed to be called,
;; so it just errors out.

;;; Code:

(if (not (fboundp 'msdos-remember-default-colors))
    (error "%s: Loading pc-win.el but not compiled for MS-DOS"
	   (invocation-name)))

(load "term/internal" nil t)

(declare-function msdos-remember-default-colors "msdos.c")
(declare-function w16-set-clipboard-data "w16select.c")
(declare-function w16-get-clipboard-data "w16select.c")
(declare-function msdos-setup-keyboard "internal" (frame))

;;; This was copied from etc/rgb.txt, except that some values were changed
;;; a bit to make them consistent with DOS console colors, and the RGB
;;; values were scaled up to 16 bits, as `tty-define-color' requires.
;;;
;;; The mapping between the 16 standard EGA/VGA colors and X color names
;;; was done by running a Unix version of Emacs inside an X client and a
;;; DJGPP-compiled Emacs on the same PC.  The names of X colors used to
;;; define the pixel values are shown as comments to each color below.
;;;
;;; If you want to change the RGB values, keep in mind that various pieces
;;; of Emacs think that a color whose RGB values add up to less than 0.6 of
;;; the values for WHITE (i.e. less than 117963) are ``dark'', otherwise the
;;; color is ``light''; see `frame-set-background-mode' in lisp/faces.el for
;;; an example.
(defvar msdos-color-values
  '(("black"          0     0     0     0)
    ("blue"           1     0     0 52480) ; MediumBlue
    ("green"          2  8704 35584  8704) ; ForestGreen
    ("cyan"           3     0 52736 53504) ; DarkTurquoise
    ("red"            4 45568  8704  8704) ; FireBrick
    ("magenta"        5 35584     0 35584) ; DarkMagenta
    ("brown"          6 40960 20992 11520) ; Sienna
    ("lightgray"      7 48640 48640 48640) ; Gray
    ("darkgray"       8 26112 26112 26112) ; Gray40
    ("lightblue"      9     0     0 65535) ; Blue
    ("lightgreen"    10     0 65535     0) ; Green
    ("lightcyan"     11     0 65535 65535) ; Cyan
    ("lightred"      12 65535     0     0) ; Red
    ("lightmagenta"  13 65535     0 65535) ; Magenta
    ("yellow"        14 65535 65535     0) ; Yellow
    ("white"         15 65535 65535 65535))
  "A list of MS-DOS console colors, their indices and 16-bit RGB values.")

;; ---------------------------------------------------------------------------
;; We want to delay setting frame parameters until the faces are setup
(defvar default-frame-alist nil)
;(modify-frame-parameters terminal-frame default-frame-alist)

(defun msdos-face-setup ()
  "Initial setup of faces for the MS-DOS display."
  (set-face-foreground 'bold "yellow")
  (set-face-foreground 'italic "red")
  (set-face-foreground 'bold-italic "lightred")
  (set-face-foreground 'underline "white")

  (make-face 'msdos-menu-active-face)
  (make-face 'msdos-menu-passive-face)
  (make-face 'msdos-menu-select-face)
  (set-face-foreground 'msdos-menu-active-face "white")
  (set-face-foreground 'msdos-menu-passive-face "lightgray")
  (set-face-background 'msdos-menu-active-face "blue")
  (set-face-background 'msdos-menu-passive-face "blue")
  (set-face-background 'msdos-menu-select-face "red"))

(defun msdos-handle-reverse-video (frame parameters)
  "Handle the reverse-video frame parameter on MS-DOS frames."
  (when (cdr (or (assq 'reverse parameters)
		 (assq 'reverse default-frame-alist)))
      (let* ((params (frame-parameters frame))
	     (fg (cdr (assq 'foreground-color params)))
	     (bg (cdr (assq 'background-color params))))
	(if (equal fg (cdr (assq 'mouse-color params)))
	    (modify-frame-parameters frame
				     (list (cons 'mouse-color bg))))
	(if (equal fg (cdr (assq 'cursor-color params)))
	    (modify-frame-parameters frame
				     (list (cons 'cursor-color bg)))))))

;; This must run after all the default colors are inserted into
;; tty-color-alist, since msdos-handle-reverse-video needs to know the
;; actual frame colors.
(defun msdos-setup-initial-frame ()
  (modify-frame-parameters terminal-frame default-frame-alist)
  ;; This remembers the screen colors after applying default-frame-alist,
  ;; so that all subsequent frames could begin with those colors.
  (msdos-remember-default-colors terminal-frame)
  (modify-frame-parameters terminal-frame initial-frame-alist)
  (msdos-handle-reverse-video terminal-frame
			      (frame-parameters terminal-frame))

  (frame-set-background-mode terminal-frame)
  (face-set-after-frame-default terminal-frame))

;; We create frames as if we were a terminal, but without invoking the
;; terminal-initialization function.  Also, our handling of reverse
;; video is slightly different.
(defun msdos-create-frame-with-faces (&optional parameters)
  "Create an frame on MS-DOS display.
Optional frame parameters PARAMETERS specify the frame parameters.
Parameters not specified by PARAMETERS are taken from
`default-frame-alist'.  If either PARAMETERS or `default-frame-alist'
contains a `reverse' parameter, handle that.  Value is the new frame
created."
  (let ((frame (make-terminal-frame parameters))
	success)
    (unwind-protect
	(with-selected-frame frame
	  (msdos-handle-reverse-video frame (frame-parameters frame))
          (unless (terminal-parameter frame 'terminal-initted)
            (set-terminal-parameter frame 'terminal-initted t))
	  (frame-set-background-mode frame)
	  (face-set-after-frame-default frame)
	  (setq success t))
      (unless success (delete-frame frame)))
    frame))

;; ---------------------------------------------------------------------------
;; More or less useful imitations of certain X-functions.  A lot of the
;; values returned are questionable, but usually only the form of the
;; returned value matters.  Also, by the way, recall that `ignore' is
;; a useful function for returning 'nil regardless of argument.

;; From src/xfns.c
(defun x-list-fonts (pattern &optional face frame maximum width)
  (if (or (null width) (and (numberp width) (= width 1)))
      (list "ms-dos")
    (list "no-such-font")))
(defun x-display-pixel-width (&optional frame) (frame-width frame))
(defun x-display-pixel-height (&optional frame) (frame-height frame))
(defun x-display-planes (&optional frame) 4) ;bg switched to 16 colors as well
(defun x-display-color-cells (&optional frame) 16)
(defun x-server-max-request-size (&optional frame) 1000000) ; ???
(defun x-server-vendor (&optional frame) t "GNU")
(defun x-server-version (&optional frame) '(1 0 0))
(defun x-display-screens (&optional frame) 1)
(defun x-display-mm-height (&optional frame) 245) ; Guess the size of my
(defun x-display-mm-width (&optional frame) 322)  ; monitor, EZ...
(defun x-display-backing-store (&optional frame) 'not-useful)
(defun x-display-visual-class (&optional frame) 'static-color)
(fset 'x-display-save-under 'ignore)
(fset 'x-get-resource 'ignore)

;; From lisp/term/x-win.el
(defvar x-display-name "pc"
  "The name of the window display on which Emacs was started.
On X, the display name of individual X frames is recorded in the
`display' frame parameter.")
(defvar x-colors (mapcar 'car msdos-color-values)
  "List of basic colors available on color displays.
For X, the list comes from the `rgb.txt' file,v 10.41 94/02/20.
For Nextstep, this is a list of non-PANTONE colors returned by
the operating system.")

;; From lisp/term/w32-win.el
;
;;;; Selections and cut buffers
;
;;; We keep track of the last text selected here, so we can check the
;;; current selection against it, and avoid passing back our own text
;;; from x-cut-buffer-or-selection-value.
(defvar x-last-selected-text nil)

(defcustom x-select-enable-clipboard t
  "Non-nil means cutting and pasting uses the clipboard.
This is in addition to, but in preference to, the primary selection.

On MS-Windows, this is non-nil by default, since Windows does not
support other types of selections.  \(The primary selection that is
set by Emacs is not accessible to other programs on Windows.\)"
  :type 'boolean
  :group 'killing)

(defun x-select-text (text &optional push)
  "Select TEXT, a string, according to the window system.

On X, put TEXT in the primary X selection.  For backward
compatibility with older X applications, set the value of X cut
buffer 0 as well, and if the optional argument PUSH is non-nil,
rotate the cut buffers.  If `x-select-enable-clipboard' is
non-nil, copy the text to the X clipboard as well.

On Windows, make TEXT the current selection.  If
`x-select-enable-clipboard' is non-nil, copy the text to the
clipboard as well.  The argument PUSH is ignored.

On Nextstep, put TEXT in the pasteboard; PUSH is ignored."
  (if x-select-enable-clipboard
      (w16-set-clipboard-data text))
  (setq x-last-selected-text text))

;;; Return the value of the current selection.
;;; Consult the selection, then the cut buffer.  Treat empty strings
;;; as if they were unset.
(defun x-get-selection-value ()
  (if x-select-enable-clipboard
      (let (text)
	;; Don't die if x-get-selection signals an error.
	(condition-case c
	    (setq text (w16-get-clipboard-data))
	  (error (message "w16-get-clipboard-data:%s" c)))
	(if (string= text "") (setq text nil))
	(cond
	 ((not text) nil)
	 ((eq text x-last-selected-text) nil)
	 ((string= text x-last-selected-text)
	  ;; Record the newer string, so subsequent calls can use the 'eq' test.
	  (setq x-last-selected-text text)
	  nil)
	 (t
	  (setq x-last-selected-text text))))))

;; x-selection-owner-p is used in simple.el.
(defun x-selection-owner-p (&optional type)
  "Whether the current Emacs process owns the given X Selection.
The arg should be the name of the selection in question, typically one of
the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
For convenience, the symbol nil is the same as `PRIMARY',
and t is the same as `SECONDARY'."
    (if x-select-enable-clipboard
      (let (text)
	;; Don't die if w16-get-clipboard-data signals an error.
	(ignore-errors
	  (setq text (w16-get-clipboard-data)))
	;; We consider ourselves the owner of the selection if it does
	;; not exist, or exists and compares equal with the last text
	;; we've put into the Windows clipboard.
	(cond
	 ((not text) t)
	 ((or (eq text x-last-selected-text)
	      (string= text x-last-selected-text))
	  text)
	 (t nil)))))

;; x-own-selection-internal and x-disown-selection-internal are used
;; in select.el:x-set-selection.
(defun x-own-selection-internal (type value)
  "Assert an X selection of the given TYPE with the given VALUE.
TYPE is a symbol, typically `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
VALUE is typically a string, or a cons of two markers, but may be
anything that the functions on `selection-converter-alist' know about."
  (ignore-errors
    (x-select-text value))
  value)

(defun x-disown-selection-internal (selection &optional time)
  "If we own the selection SELECTION, disown it.
Disowning it means there is no such selection."
  (if (x-selection-owner-p selection)
      t))

;; From lisp/faces.el: we only have one font, so always return
;; it, no matter which variety they've asked for.
(defun x-frob-font-slant (font which)
  font)
(make-obsolete 'x-frob-font-slant 'make-face-... "21.1")
(defun x-frob-font-weight (font which)
  font)
(make-obsolete 'x-frob-font-weight 'make-face-... "21.1")

;; From src/fontset.c:
(fset 'query-fontset 'ignore)

;; From lisp/term/x-win.el: make iconify-or-deiconify-frame a no-op.
(fset 'iconify-or-deiconify-frame 'ignore)

;; From lisp/frame.el
(fset 'set-default-font 'ignore)
(fset 'set-mouse-color 'ignore)		; We cannot, I think.
(fset 'set-cursor-color 'ignore)	; Hardware determined by char under.
(fset 'set-border-color 'ignore)	; Not useful.

(defvar msdos-last-help-message nil
  "The last help message received via `show-help-function'.
This is used by `msdos-show-help'.")

(defvar msdos-previous-message nil
  "The content of the echo area before help echo was displayed.")

(defun msdos-show-help (help)
  "Function installed as `show-help-function' on MS-DOS frames."
  (when (and (not (window-minibuffer-p)) ;Don't overwrite minibuffer contents.
             (not cursor-in-echo-area)) ;Don't overwrite a prompt.
    (cond
     ((stringp help)
      (setq help (replace-regexp-in-string "\n" ", " help))
      (unless (or msdos-previous-message
		  (string-equal help (current-message))
		  (and (stringp msdos-last-help-message)
		       (string-equal msdos-last-help-message
				     (current-message))))
        (setq msdos-previous-message (current-message)))
      (setq msdos-last-help-message help)
      (let ((message-truncate-lines nil)
            (message-log-max nil))
        (message "%s" help)))
     ((stringp msdos-previous-message)
      (let ((message-log-max nil))
        (message "%s" msdos-previous-message)
        (setq msdos-previous-message nil)))
     (t
      (message nil)))))


;; Initialization.
;; ---------------------------------------------------------------------------
;; This function is run, by faces.el:tty-create-frame-with-faces, only
;; for the initial frame (on each terminal, but we have only one).
;; This works by setting the `terminal-initted' terminal parameter to
;; this function, the first time `tty-create-frame-with-faces' is
;; called on that terminal.  `tty-create-frame-with-faces' is called
;; directly from startup.el and also by `make-frame' through
;; `frame-creation-function-alist'.  `make-frame' will call this
;; function if `msdos-create-frame-with-faces' (see below) is not
;; found in `frame-creation-function-alist', which means something is
;; _very_ wrong, because "internal" terminal emulator should not be
;; turned on if our window-system is not `pc'.  Therefore, the only
;; Right Thing for us to do here is scream bloody murder.
(defun terminal-init-internal ()
  "Terminal initialization function for the MS-DOS \"internal\" terminal.
Errors out because it is not supposed to be called, ever."
  (error "terminal-init-internal called for window-system `%s'"
	 (window-system)))

(defun msdos-initialize-window-system ()
  "Initialization function for the `pc' \"window system\"."
  (or (eq (window-system) 'pc)
      (error
       "`msdos-initialize-window-system' called, but window-system is `%s'"
       (window-system)))
  ;; First, the keyboard.
  (msdos-setup-keyboard terminal-frame)	; see internal.el
  ;; Next, register the default colors.
  (let* ((colors msdos-color-values)
	 (color (car colors)))
    (tty-color-clear)
    (while colors
      (tty-color-define (car color) (cadr color) (cddr color))
      (setq colors (cdr colors) color (car colors))))
  ;; Modifying color mappings means realized faces don't
  ;; use the right colors, so clear them.
  (clear-face-cache)
  ;; Now set up some additional faces.
  (msdos-face-setup)
  ;; Set up the initial frame.
  (msdos-setup-initial-frame)
  ;; Help echo is displayed in the echo area.
  (setq show-help-function 'msdos-show-help)
  ;; We want to delay the codepage-related setup until after user's
  ;; .emacs is processed, because people might define their
  ;; `dos-codepage-setup-hook' there.
  (add-hook 'after-init-hook 'dos-codepage-setup)
  ;; In multibyte mode, we want unibyte buffers to be displayed
  ;; using the terminal coding system, so that they display
  ;; correctly on the DOS terminal; in unibyte mode we want to see
  ;; all 8-bit characters verbatim.  In both cases, we want the
  ;; entire range of 8-bit characters to arrive at our display code
  ;; verbatim.
  (standard-display-8bit 127 255)
  ;; We are fast enough to make this optimization unnecessary.
  (setq split-window-keep-point t)
  ;; Arrange for the kill and yank functions to set and check the
  ;; clipboard.
  (setq interprogram-cut-function 'x-select-text)
  (setq interprogram-paste-function 'x-get-selection-value)
  (menu-bar-enable-clipboard)
  (run-hooks 'terminal-init-msdos-hook))

;; frame-creation-function-alist is examined by frame.el:make-frame.
(add-to-list 'frame-creation-function-alist
	     '(pc . msdos-create-frame-with-faces))
;; window-system-initialization-alist is examined by startup.el:command-line.
(add-to-list 'window-system-initialization-alist
	     '(pc . msdos-initialize-window-system))
;; We don't need anything beyond tty-handle-args for handling
;; command-line argument; see startup.el.
(add-to-list 'handle-args-function-alist '(pc . tty-handle-args))

;; ---------------------------------------------------------------------------

(provide 'pc-win)

;; arch-tag: 5cbdb455-b495-427b-95d0-e417d77d00b4
;;; pc-win.el ends here