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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; -*- Mode: Emacs-Lisp -*-
2
3 ;;; ilisp-out.el --
4
5 ;;; This file is part of ILISP.
6 ;;; Version: 5.7
7 ;;;
8 ;;; Copyright (C) 1990, 1991, 1992, 1993 Chris McConnell
9 ;;; 1993, 1994 Ivan Vasquez
10 ;;; 1994, 1995 Marco Antoniotti and Rick Busdiecker
11 ;;;
12 ;;; Other authors' names for which this Copyright notice also holds
13 ;;; may appear later in this file.
14 ;;;
15 ;;; Send mail to 'ilisp-request@lehman.com' to be included in the
16 ;;; ILISP mailing list. 'ilisp@lehman.com' is the general ILISP
17 ;;; mailing list were bugs and improvements are discussed.
18 ;;;
19 ;;; ILISP is freely redistributable under the terms found in the file
20 ;;; COPYING.
21
22
23
24 ;;;
25 ;;; ILISP output, including a popper replacement.
26 ;;;
27
28 (defvar ilisp-output-buffer " *Output*")
29 (defvar ilisp-output-buffer-major-mode 'lisp-mode
30 "*The major mode for the ilisp typeout window.")
31 (defvar ilisp-output-min-height 2
32 "*The minimum height of the typeout window used to display ilisp output.")
33 (defvar ilisp-output-max-height 25
34 "*The maximum height of the typeout window used to display ilisp output.")
35 (defvar ilisp-display-output-function 'ilisp-display-output-default
36 "The name of a function to display all ilisp output. The function gets a
37 single argument, a string.")
38
39
40 ;; Minor mode (just to get a pretty mode line).
41 (defvar ilisp-output-mode-line nil)
42 (defvar ilisp-output-mode nil "If T, then we are in the ilisp-output minor mode.")
43 (make-variable-buffer-local 'ilisp-output-mode)
44
45 (or (assq 'ilisp-output-mode minor-mode-alist)
46 (setq minor-mode-alist
47 (cons '(ilisp-output-mode ilisp-output-mode-line) minor-mode-alist)))
48
49
50 (defun ilisp-output-buffer (&optional create-p)
51 (let ((buffer (if create-p
52 (get-buffer-create ilisp-output-buffer)
53 (get-buffer ilisp-output-buffer))))
54 (or ilisp-output-mode-line
55 (setq ilisp-output-mode-line
56 (list (format
57 " %s bury, %s scroll"
58 (ilisp-where-is 'ilisp-bury-output)
59 (ilisp-where-is 'ilisp-scroll-output)))))
60 buffer))
61
62 (defun ilisp-output-window ()
63 (let ((buffer (get-buffer ilisp-output-buffer)))
64 (if buffer
65 (get-buffer-window buffer))))
66
67
68 (defun lisp-display-output (output)
69 "Display OUTPUT in the appropriate place.
70 This calls the function given by the value of ilisp-display-output-function in
71 order to do the real work."
72 (cond ((null output))
73 (t
74 ;; Bugcheck
75 (if (not (stringp output))
76 (error "bug: not a string in lisp-display-output"))
77
78 (if (ilisp-value 'comint-errorp t)
79 (setq output (funcall (ilisp-value 'ilisp-error-filter)
80 output)))
81 (funcall ilisp-display-output-function output))))
82
83
84
85 ;;; Popper replacement
86
87
88 (defun ilisp-bury-output ()
89 "Delete the typeout window, if any"
90 (interactive)
91 (let* ((buffer (ilisp-output-buffer))
92 (window (and buffer (get-buffer-window buffer))))
93 (if buffer
94 (bury-buffer buffer))
95 (if window
96 (ilisp-delete-window window))))
97
98
99 (defun ilisp-show-output (&optional buffer)
100 "Make typeout visible, if it is not already."
101 (interactive)
102 (let ((buffer (or buffer (ilisp-output-buffer))))
103 (if buffer
104 (ilisp-display-buffer-in-typeout-window buffer))))
105
106
107 (defun ilisp-delete-window (window)
108 "Delete a window with minimal redisplay."
109 (let ((height (window-height window))
110 (lower-window (ilisp-find-lower-window window)))
111 (delete-window window)
112 (if (and lower-window
113 (not (eq lower-window window)))
114 (let ((old-window (selected-window)))
115 (save-excursion
116 (select-window lower-window)
117 (set-buffer (window-buffer))
118 (goto-char (window-start))
119 (vertical-motion (- height))
120 (set-window-start lower-window (point)))
121 (select-window old-window)))))
122
123
124 (defun ilisp-scroll-output (&optional lines)
125 "Scroll the typeout-window, if any."
126 (interactive "P")
127 (let* ((buffer (ilisp-output-buffer))
128 (window (and buffer (get-buffer-window buffer)))
129 (old-window (selected-window)))
130 (if window
131 (unwind-protect
132 (progn
133 (select-window window)
134 (set-buffer buffer)
135 (scroll-up lines))
136 (select-window old-window)))))
137
138
139 (defun ilisp-grow-output (&optional n)
140 "Grow the typeout window by ARG (default 1) lines."
141 (interactive "p")
142 (let* ((buffer (ilisp-output-buffer))
143 (window (and buffer (get-buffer-window buffer)))
144 (old-window (selected-window)))
145 (if window
146 (unwind-protect
147 (progn
148 (select-window window)
149 (enlarge-window n))
150 (if (ilisp-window-live-p old-window)
151 (select-window old-window))))))
152
153
154 (defun ilisp-trim-blank-lines ()
155 ;; Delete leading blank lines
156 (goto-char (point-min))
157 (if (looking-at "\n+")
158 (replace-match ""))
159 ;; Delete trailing blank lines
160 (goto-char (point-max))
161 (skip-chars-backward "\n")
162 (if (< (point) (point-max))
163 (delete-region (1+ (point)) (point-max))))
164
165
166 (defun ilisp-write-string-to-buffer (buffer string)
167 (save-excursion
168 (set-buffer buffer)
169 ;; Maybe an option to keep the old output?
170 (erase-buffer)
171 ;; New: select mode for the output buffer.
172 (if (not (eq major-mode ilisp-output-buffer-major-mode))
173 (funcall ilisp-output-buffer-major-mode))
174 (setq ilisp-output-mode t)
175 (princ string buffer)
176 (ilisp-trim-blank-lines)
177 (goto-char (point-min))))
178
179
180 (defun ilisp-desired-height (buffer-or-window)
181 (let ((height
182 (cond ((bufferp buffer-or-window)
183 (ilisp-needed-buffer-height buffer-or-window))
184 ((windowp buffer-or-window)
185 (ilisp-needed-window-height buffer-or-window)))))
186 (max window-min-height
187 (min ilisp-output-max-height
188 (max ilisp-output-min-height
189 height)))))
190
191
192 ;; A first guess at the height needed to display this buffer.
193 (defun ilisp-needed-buffer-height (buffer)
194 (save-excursion
195 (set-buffer buffer)
196 (1+ (count-lines (point-min) (point-max)))))
197
198
199 ;; The height this window must be to display its entire buffer.
200 (defun ilisp-needed-window-height (window)
201 (save-window-excursion
202 (select-window window)
203 (save-excursion
204 (set-buffer (window-buffer))
205 (+ 2 (save-excursion
206 (goto-char (point-min))
207 ;; Any upper bound on the height of an emacs window will
208 ;; do here. How about 1000.
209 (vertical-motion 1000))))))
210
211
212 (defun ilisp-shrink-wrap-window (window)
213 (let ((previously-selected-window (selected-window))
214 (buffer (window-buffer window)))
215
216 (select-window window)
217 (let* ((current-height (window-height window))
218 (desired-height (ilisp-desired-height window))
219 (delta (- desired-height current-height)))
220 (enlarge-window delta)
221 (set-buffer buffer)
222 (goto-char (point-min))
223
224 ;; Now repair damage to the window below us, if it still exists.
225 (let ((lower-window (ilisp-find-lower-window window)))
226 (if lower-window
227 (progn
228 (select-window lower-window)
229 (let ((old-point (point)))
230 (goto-char (window-start))
231 (vertical-motion delta)
232 (set-window-start lower-window (point))
233 (goto-char old-point)
234 (if (not (pos-visible-in-window-p old-point))
235 (recenter 0))))))
236 ;; If there was no lower window, then we ought to preserve
237 ;; the start of the window above us, if any.
238
239 (if (ilisp-window-live-p previously-selected-window)
240 (select-window previously-selected-window)))))
241
242
243
244 (defun ilisp-window-live-p (window)
245 (let* ((initial-window (selected-window))
246 (win initial-window)
247 (found nil))
248 (while win
249 (cond ((eq window win)
250 (setq found t
251 win nil))
252 (t
253 (setq win (next-window win 'no))
254 (if (eq win initial-window)
255 (setq win nil)))))
256 found))
257
258 ;; XEmacs change -- window-edges is gone in 19.12+ so use
259 ;; next-vertical-window instead.
260 (defun ilisp-find-lower-window (window)
261 "Find the window directly below us, if any. This is probably the
262 window from which enlarge-window would steal lines."
263 (if (< emacs-minor-version 12)
264 (let* ((bottom (nth 3 (window-edges window)))
265 (window* nil)
266 (win window))
267 (while (not (eq (setq win (next-window win 'no))
268 window))
269 (if (and (= (nth 1 (window-edges win))
270 bottom)
271 (null window*))
272 (setq window* win)))
273 window*)
274 (next-vertical-window window)))
275
276 ;; XEmacs change -- There is now a primitive to do this.
277 (defun ilisp-find-top-left-most-window ()
278 "Return the leftmost topmost window on the current screen."
279 (if (< emacs-minor-version 12)
280 (let* ((window* (selected-window))
281 (edges* (window-edges window*))
282 (win nil)
283 (edges nil)
284 (start-window window*))
285 (while (not (eq (setq win (next-window win 'no))
286 start-window))
287 (setq edges (window-edges win))
288 (if (or (< (car (cdr edges)) (car (cdr edges*))) ; top
289 (and (= (car (cdr edges)) (car (cdr edges*)))
290 (< (car edges) (car edges*)))) ; left
291 (setq window* win
292 edges* edges)))
293 window*)
294 (frame-highest-window (selected-frame) 0)))
295
296
297 ;; This causes the typeout window to be created by splitting or using the
298 ;; top-left-most window on the current screen. That is different behavior
299 ;; from the popper, which always split the current window.
300 (defun ilisp-window-to-use-for-typeout ()
301 (ilisp-find-top-left-most-window))
302
303
304 (defun ilisp-display-buffer-in-typeout-window (buffer)
305 "Display buffer in a window at the top of the screen."
306 (let ((window (get-buffer-window buffer)))
307
308 ;; If buffer already has a window, keep it.
309 (if (null window)
310 ;; Otherwise, find a window to split.
311 (let* ((top-window (ilisp-window-to-use-for-typeout))
312 (new-window nil)
313 (previously-selected-window (selected-window))
314 (desired-height (ilisp-desired-height buffer)))
315
316 ;; The new window is always the lower one.
317 (select-window top-window)
318
319 ;; Always minimize redisplay (except in emacs 18).
320 (let ((split-window-keep-point nil))
321 ;; If the top window is not big enough to split, commandeer it
322 ;; entirely.
323 (cond ((> desired-height (- (window-height) window-min-height))
324 (setq new-window top-window))
325 (t
326 (setq new-window (split-window-vertically desired-height)))))
327
328 (set-window-buffer top-window buffer)
329 ;; The height is already correct, unless there was line wrapping.
330 ;; Account for that here.
331 (ilisp-shrink-wrap-window top-window)
332
333 ;; Restore selected window.
334 (if (eq previously-selected-window top-window)
335 (select-window new-window)
336 (select-window previously-selected-window)))
337
338 ;; Simply shrink-wrap an existing window.
339 (ilisp-shrink-wrap-window window))))
340
341
342
343
344
345
346
347
348 ;;; Various functions to which to bind ilisp-display-output-function.
349
350 ;; This function does what ilisp used to do, except that we use the
351 ;; new "popper".
352
353 (defun ilisp-display-output-default (output)
354 "Dispatch on the value of lisp-no-popper:
355 lisp-no-popper = nil: display output in a typeout window.
356 lisp-no-popper = t: display output in the ilisp buffer
357 otherwise: display one-line output in the echo area, multiline output in the ilisp buffer."
358 (cond ((null lisp-no-popper)
359 (ilisp-display-output-in-typeout-window output))
360 ((eq lisp-no-popper t)
361 (ilisp-display-output-in-lisp-listener output))
362 (t
363 (ilisp-display-output-adaptively output))))
364
365
366 ;; This is the display function I like to use.
367
368 ;; Another trick which might be useful is to dispatch on the value
369 ;; this-command here, to make output from different ilisp commands
370 ;; go to different places.
371
372 (defun ilisp-display-output-adaptively (output)
373 "Display one-liners in the echo area, others in the typeout window"
374 (cond ((or (string-match "\n" output)
375 (> (length output) (window-width (minibuffer-window))))
376 (message "See above.")
377 (ilisp-display-output-in-typeout-window output))
378 (t
379 (ilisp-display-output-in-echo-area output))))
380
381
382 (defun ilisp-display-output-in-typeout-window (output)
383 "Display output in a shrink-wrapped window at the top of the screen."
384 (let ((buffer (ilisp-output-buffer t)))
385 (ilisp-write-string-to-buffer buffer output)
386 (ilisp-display-buffer-in-typeout-window buffer)))
387
388
389 (defun ilisp-display-output-in-echo-area (output)
390 "Display output as a message in the echo area."
391 ;; First clear any existing typeout so as to not confuse the user.
392 (or (eq (selected-window) (ilisp-output-window))
393 (ilisp-bury-output))
394 ;; Patch suggested by hunter@work.nlm.nih.gov (Larry Hunter)
395 ;; If output contains '%', 'message' loses.
396 ;; (message (ilisp-quote-%s output))
397 ;; An alternative here could be '(princ output)', as suggested by
398 ;; Christopher Hoover <ch@lks.csi.com>
399 (princ output)
400 )
401
402
403 ;;; ilisp-quote-%s --
404 ;;; Patch suggested by hunter@work.nlm.nih.gov (Larry Hunter)
405
406 (defun ilisp-quote-%s (string)
407 "Quote all the occurences of ?% in STRING in an ELisp fashion."
408 (mapconcat '(lambda (char)
409 (if (char-equal char ?%)
410 "%%"
411 (char-to-string char)))
412 string ""))
413
414
415 (defun ilisp-display-output-in-temp-buffer (output)
416 (with-output-to-temp-buffer ilisp-output-buffer
417 (princ output)))
418
419
420 (defun ilisp-display-output-in-lisp-listener (output)
421 "Display output in the ilisp buffer"
422 (let ((buffer (current-buffer))
423 (window (selected-window)))
424 (unwind-protect
425 (progn
426 (lisp-pop-to-buffer (ilisp-buffer))
427 (if (not (eq (current-buffer) buffer))
428 (setq ilisp-last-buffer buffer))
429 (comint-insert
430 (concat
431 (if ilisp-last-message
432 (concat ";;; " ilisp-last-message "\n"))
433 (comint-remove-whitespace output)
434 "\n"
435 ilisp-last-prompt))
436 (setq ilisp-last-message nil))
437 (if (window-point window)
438 (progn (select-window window)
439 (set-buffer buffer))))))
440
441
442
443 ;;; Changed according to suggestions by Robert P. Goldman
444 (defun lisp-pop-to-buffer (buffer)
445 "Like pop-to-buffer, but select a screen that buffer was shown in."
446 (let ((ilisp-window (if ilisp-epoch-running
447 (epoch::get-buffer-window buffer)
448 (get-buffer-window buffer))))
449 (if ilisp-window
450 (select-window ilisp-window)
451 ;; It is not currently displayed, so find some place to display
452 ;; it.
453 (progn
454 (cond (ilisp-epoch-running
455 ;; Select a screen that the buffer has been displayed in before
456 ;; or the current screen otherwise.
457 (epoch::select-screen
458 ;; allowed-screens in epoch 3.2, was called screens before that
459 (or (car (save-excursion
460 (set-buffer buffer)
461 (symbol-value 'allowed-screens)))
462 (epoch::current-screen))))
463
464 ;; Next clauses patterned after a suggestion by R. P. Goldman.
465 ((eq +ilisp-emacs-version-id+ 'fsf-19)
466 (let* ((window (get-buffer-window buffer t))
467 (frame (if window (window-frame window))))
468 (if (eq 'x (framep frame))
469 (progn
470 (raise-frame frame)
471 (select-frame frame)))))
472 (t nil)) ; fsf-18, but also lucid and
473 ; xemacs.
474 ; I do not know how to make
475 ; them work
476 ; Marco Antoniotti, Jan 4th 1995
477 (ilisp-bury-output)
478 (pop-to-buffer buffer))))
479 (set-buffer buffer))
480
481 ;(defun lisp-pop-to-buffer (buffer)
482 ; "Like pop-to-buffer, but select a screen that buffer was shown in.
483 ; Also, first bury any typeout-window."
484 ; (let ((ilisp-window (if ilisp-epoch-running
485 ; (epoch::get-buffer-window buffer)
486 ; (get-buffer-window buffer))))
487 ; (if ilisp-window
488 ; (select-window ilisp-window)
489 ; ;; It is not currently displayed, so find some place to display it.
490 ; (if ilisp-epoch-running
491 ; ;; Select a screen that the buffer has been displayed in before
492 ; ;; or the current screen otherwise.
493 ; (epoch::select-screen
494 ; ;; allowed-screens in epoch 3.2, was called screens before that
495 ; (or (car (save-excursion
496 ; (set-buffer buffer)
497 ; (symbol-value 'allowed-screens)))
498 ; (epoch::current-screen))))
499 ; ;; Do not pop to the output buffer.
500 ; (ilisp-bury-output)
501 ; (pop-to-buffer buffer)))
502 ; (set-buffer buffer))
503
504
505 ;;;
506 (defun switch-to-lisp (eob-p &optional ilisp-only)
507 "If in an ILISP buffer, switch to the buffer that last switched to
508 an ILISP otherwise, switch to the current ILISP buffer. With
509 argument, positions cursor at end of buffer. If you don't want to
510 split windows, set pop-up-windows to NIL."
511 (interactive "P")
512 (if (and (not ilisp-only) ilisp-last-buffer
513 (memq major-mode ilisp-modes))
514 (lisp-pop-to-buffer ilisp-last-buffer)
515 (if (not (memq major-mode ilisp-modes))
516 (setq ilisp-last-buffer (current-buffer)))
517 (lisp-pop-to-buffer (ilisp-buffer))
518 (cond (eob-p (goto-char (point-max))))))