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1 | ;;; xscheme.el --- run MIT Scheme under Emacs |
2 | ||
034babe1 | 3 | ;; Copyright (C) 1986, 1987, 1989, 1990, 2001, 2002, 2003, 2004, 2005 |
eac9c0ef | 4 | ;; Free Software Foundation, Inc. |
c5c3d778 DL |
5 | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: languages, lisp | |
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 the | |
3a35cf56 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
c5c3d778 DL |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; A major mode for interacting with MIT Scheme. | |
29 | ;; | |
30 | ;; Requires MIT Scheme release 5 or later. | |
31 | ;; Changes to Control-G handler require runtime version 13.85 or later. | |
32 | ||
33 | ;;; Code: | |
34 | ||
35 | (require 'scheme) | |
36 | \f | |
37 | (defgroup xscheme nil | |
38 | "Major mode for editing Scheme and interacting with MIT's C-Scheme." | |
39 | :group 'lisp) | |
40 | ||
41 | (defcustom scheme-band-name nil | |
42 | "*Band loaded by the `run-scheme' command." | |
43 | :type '(choice (const nil) string) | |
44 | :group 'xscheme) | |
45 | ||
46 | (defcustom scheme-program-arguments nil | |
47 | "*Arguments passed to the Scheme program by the `run-scheme' command." | |
48 | :type '(choice (const nil) string) | |
49 | :group 'xscheme) | |
50 | ||
51 | (defcustom xscheme-allow-pipelined-evaluation t | |
52 | "If non-nil, an expression may be transmitted while another is evaluating. | |
53 | Otherwise, attempting to evaluate an expression before the previous expression | |
54 | has finished evaluating will signal an error." | |
55 | :type 'boolean | |
56 | :group 'xscheme) | |
57 | ||
58 | (defcustom xscheme-startup-message | |
59 | "This is the Scheme process buffer. | |
60 | Type \\[advertised-xscheme-send-previous-expression] to evaluate the expression before point. | |
61 | Type \\[xscheme-send-control-g-interrupt] to abort evaluation. | |
62 | Type \\[describe-mode] for more information. | |
63 | ||
64 | " | |
65 | "String to insert into Scheme process buffer first time it is started. | |
66 | Is processed with `substitute-command-keys' first." | |
67 | :type 'string | |
68 | :group 'xscheme) | |
69 | ||
70 | (defcustom xscheme-signal-death-message nil | |
71 | "If non-nil, causes a message to be generated when the Scheme process dies." | |
72 | :type 'boolean | |
73 | :group 'xscheme) | |
74 | ||
75 | (defcustom xscheme-start-hook nil | |
76 | "If non-nil, a procedure to call when the Scheme process is started. | |
77 | When called, the current buffer will be the Scheme process-buffer." | |
78 | :type 'hook | |
79 | :group 'xscheme | |
80 | :version "20.3") | |
81 | ||
82 | (defun xscheme-evaluation-commands (keymap) | |
83 | (define-key keymap "\e\C-x" 'xscheme-send-definition) | |
84 | (define-key keymap "\C-x\C-e" 'advertised-xscheme-send-previous-expression) | |
85 | (define-key keymap "\eo" 'xscheme-send-buffer) | |
86 | (define-key keymap "\ez" 'xscheme-send-definition) | |
87 | (define-key keymap "\e\C-m" 'xscheme-send-previous-expression) | |
88 | (define-key keymap "\e\C-z" 'xscheme-send-region)) | |
89 | ||
90 | (defun xscheme-interrupt-commands (keymap) | |
91 | (define-key keymap "\C-c\C-s" 'xscheme-select-process-buffer) | |
92 | (define-key keymap "\C-c\C-b" 'xscheme-send-breakpoint-interrupt) | |
93 | (define-key keymap "\C-c\C-c" 'xscheme-send-control-g-interrupt) | |
94 | (define-key keymap "\C-c\C-u" 'xscheme-send-control-u-interrupt) | |
95 | (define-key keymap "\C-c\C-x" 'xscheme-send-control-x-interrupt)) | |
96 | ||
97 | (xscheme-evaluation-commands scheme-mode-map) | |
98 | (xscheme-interrupt-commands scheme-mode-map) | |
99 | \f | |
100 | (defun run-scheme (command-line) | |
101 | "Run MIT Scheme in an inferior process. | |
102 | Output goes to the buffer `*scheme*'. | |
103 | With argument, asks for a command line." | |
104 | (interactive (list (xscheme-read-command-line current-prefix-arg))) | |
105 | (xscheme-start command-line xscheme-process-name xscheme-buffer-name)) | |
106 | ||
107 | (defun xscheme-start (command-line process-name buffer-name) | |
108 | (setq-default xscheme-process-command-line command-line) | |
109 | (switch-to-buffer | |
110 | (xscheme-start-process command-line process-name buffer-name)) | |
111 | (make-local-variable 'xscheme-process-command-line) | |
112 | (setq xscheme-process-command-line command-line)) | |
113 | ||
114 | (defun xscheme-read-command-line (arg) | |
115 | (let ((default | |
116 | (or xscheme-process-command-line | |
117 | (xscheme-default-command-line)))) | |
118 | (if arg | |
119 | (read-string "Run Scheme: " default) | |
120 | default))) | |
121 | ||
122 | (defun xscheme-default-command-line () | |
123 | (concat scheme-program-name " -emacs" | |
124 | (if scheme-program-arguments | |
125 | (concat " " scheme-program-arguments) | |
126 | "") | |
127 | (if scheme-band-name | |
128 | (concat " -band " scheme-band-name) | |
129 | ""))) | |
130 | ||
131 | (defun reset-scheme () | |
132 | "Reset the Scheme process." | |
133 | (interactive) | |
134 | (let ((process (get-process xscheme-process-name))) | |
135 | (cond ((or (not process) | |
136 | (not (eq (process-status process) 'run)) | |
137 | (yes-or-no-p | |
138 | "The Scheme process is running, are you SURE you want to reset it? ")) | |
139 | (message "Resetting Scheme process...") | |
140 | (if process | |
141 | (progn | |
142 | (kill-process process t) | |
143 | (delete-process process))) | |
144 | (xscheme-start-process xscheme-process-command-line | |
145 | xscheme-process-name | |
146 | xscheme-buffer-name) | |
147 | (message "Resetting Scheme process...done"))))) | |
148 | \f | |
149 | ;;;; Multiple Scheme buffer management commands | |
150 | ||
151 | (defun start-scheme (buffer-name &optional globally) | |
152 | "Choose a scheme interaction buffer, or create a new one." | |
153 | ;; (interactive "BScheme interaction buffer: \nP") | |
154 | (interactive | |
155 | (list (read-buffer "Scheme interaction buffer: " | |
156 | xscheme-buffer-name | |
157 | nil) | |
158 | current-prefix-arg)) | |
159 | (let ((buffer (get-buffer-create buffer-name))) | |
160 | (let ((process (get-buffer-process buffer))) | |
161 | (if process | |
162 | (switch-to-buffer buffer) | |
163 | (if (or (not (buffer-file-name buffer)) | |
164 | (yes-or-no-p (concat "Buffer " | |
165 | (buffer-name buffer) | |
166 | " contains file " | |
167 | (buffer-file-name buffer) | |
168 | "; start scheme in it? "))) | |
169 | (progn | |
170 | (xscheme-start (xscheme-read-command-line t) | |
171 | buffer-name | |
172 | buffer-name) | |
173 | (if globally | |
174 | (global-set-scheme-interaction-buffer buffer-name))) | |
175 | (message "start-scheme aborted")))))) | |
176 | ||
177 | (fset 'select-scheme 'start-scheme) | |
178 | ||
179 | (defun global-set-scheme-interaction-buffer (buffer-name) | |
180 | "Set the default scheme interaction buffer." | |
181 | (interactive | |
182 | (list (read-buffer "Scheme interaction buffer: " | |
183 | xscheme-buffer-name | |
184 | t))) | |
185 | (let ((process-name (verify-xscheme-buffer buffer-name nil))) | |
186 | (setq-default xscheme-buffer-name buffer-name) | |
187 | (setq-default xscheme-process-name process-name) | |
188 | (setq-default xscheme-runlight-string | |
189 | (save-excursion (set-buffer buffer-name) | |
190 | xscheme-runlight-string)) | |
191 | (setq-default xscheme-runlight | |
192 | (if (eq (process-status process-name) 'run) | |
193 | default-xscheme-runlight | |
194 | "")))) | |
195 | ||
196 | (defun local-set-scheme-interaction-buffer (buffer-name) | |
197 | "Set the scheme interaction buffer for the current buffer." | |
198 | (interactive | |
199 | (list (read-buffer "Scheme interaction buffer: " | |
200 | xscheme-buffer-name | |
201 | t))) | |
202 | (let ((process-name (verify-xscheme-buffer buffer-name t))) | |
203 | (make-local-variable 'xscheme-buffer-name) | |
204 | (setq xscheme-buffer-name buffer-name) | |
205 | (make-local-variable 'xscheme-process-name) | |
206 | (setq xscheme-process-name process-name) | |
207 | (make-local-variable 'xscheme-runlight) | |
208 | (setq xscheme-runlight (save-excursion (set-buffer buffer-name) | |
209 | xscheme-runlight)))) | |
210 | ||
211 | (defun local-clear-scheme-interaction-buffer () | |
212 | "Make the current buffer use the default scheme interaction buffer." | |
213 | (interactive) | |
214 | (if (xscheme-process-buffer-current-p) | |
215 | (error "Cannot change the interaction buffer of an interaction buffer")) | |
216 | (kill-local-variable 'xscheme-buffer-name) | |
217 | (kill-local-variable 'xscheme-process-name) | |
218 | (kill-local-variable 'xscheme-runlight)) | |
219 | ||
220 | (defun verify-xscheme-buffer (buffer-name localp) | |
221 | (if (and localp (xscheme-process-buffer-current-p)) | |
222 | (error "Cannot change the interaction buffer of an interaction buffer")) | |
223 | (let* ((buffer (get-buffer buffer-name)) | |
224 | (process (and buffer (get-buffer-process buffer)))) | |
225 | (cond ((not buffer) | |
ac72d80b | 226 | (error "Buffer `%s' does not exist" buffer-name)) |
c5c3d778 | 227 | ((not process) |
ac72d80b | 228 | (error "Buffer `%s' is not a scheme interaction buffer" buffer-name)) |
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229 | (t |
230 | (save-excursion | |
231 | (set-buffer buffer) | |
232 | (if (not (xscheme-process-buffer-current-p)) | |
ac72d80b | 233 | (error "Buffer `%s' is not a scheme interaction buffer" |
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234 | buffer-name))) |
235 | (process-name process))))) | |
236 | \f | |
237 | ;;;; Interaction Mode | |
238 | ||
239 | (defun scheme-interaction-mode (&optional preserve) | |
240 | "Major mode for interacting with an inferior MIT Scheme process. | |
241 | Like scheme-mode except that: | |
242 | ||
243 | \\[advertised-xscheme-send-previous-expression] sends the expression before point to the Scheme process as input | |
244 | \\[xscheme-yank-pop] yanks an expression previously sent to Scheme | |
245 | \\[xscheme-yank-push] yanks an expression more recently sent to Scheme | |
246 | ||
247 | All output from the Scheme process is written in the Scheme process | |
248 | buffer, which is initially named \"*scheme*\". The result of | |
249 | evaluating a Scheme expression is also printed in the process buffer, | |
250 | preceded by the string \";Value: \" to highlight it. If the process | |
251 | buffer is not visible at that time, the value will also be displayed | |
252 | in the minibuffer. If an error occurs, the process buffer will | |
253 | automatically pop up to show you the error message. | |
254 | ||
255 | While the Scheme process is running, the modelines of all buffers in | |
256 | scheme-mode are modified to show the state of the process. The | |
257 | possible states and their meanings are: | |
258 | ||
259 | input waiting for input | |
260 | run evaluating | |
261 | gc garbage collecting | |
262 | ||
263 | The process buffer's modeline contains additional information where | |
264 | the buffer's name is normally displayed: the command interpreter level | |
265 | and type. | |
266 | ||
267 | Scheme maintains a stack of command interpreters. Every time an error | |
268 | or breakpoint occurs, the current command interpreter is pushed on the | |
269 | command interpreter stack, and a new command interpreter is started. | |
270 | One example of why this is done is so that an error that occurs while | |
271 | you are debugging another error will not destroy the state of the | |
272 | initial error, allowing you to return to it after the second error has | |
273 | been fixed. | |
274 | ||
275 | The command interpreter level indicates how many interpreters are in | |
276 | the command interpreter stack. It is initially set to one, and it is | |
277 | incremented every time that stack is pushed, and decremented every | |
278 | time it is popped. The following commands are useful for manipulating | |
279 | the command interpreter stack: | |
280 | ||
281 | \\[xscheme-send-breakpoint-interrupt] pushes the stack once | |
282 | \\[xscheme-send-control-u-interrupt] pops the stack once | |
283 | \\[xscheme-send-control-g-interrupt] pops everything off | |
284 | \\[xscheme-send-control-x-interrupt] aborts evaluation, doesn't affect stack | |
285 | ||
286 | Some possible command interpreter types and their meanings are: | |
287 | ||
288 | \[Evaluator] read-eval-print loop for evaluating expressions | |
289 | \[Debugger] single character commands for debugging errors | |
290 | \[Where] single character commands for examining environments | |
291 | ||
292 | Starting with release 6.2 of Scheme, the latter two types of command | |
293 | interpreters will change the major mode of the Scheme process buffer | |
294 | to scheme-debugger-mode , in which the evaluation commands are | |
295 | disabled, and the keys which normally self insert instead send | |
296 | themselves to the Scheme process. The command character ? will list | |
297 | the available commands. | |
298 | ||
299 | For older releases of Scheme, the major mode will be be | |
300 | scheme-interaction-mode , and the command characters must be sent as | |
301 | if they were expressions. | |
302 | ||
303 | Commands: | |
304 | Delete converts tabs to spaces as it moves back. | |
305 | Blank lines separate paragraphs. Semicolons start comments. | |
306 | \\{scheme-interaction-mode-map} | |
307 | ||
308 | Entry to this mode calls the value of scheme-interaction-mode-hook | |
309 | with no args, if that value is non-nil. | |
310 | Likewise with the value of scheme-mode-hook. | |
311 | scheme-interaction-mode-hook is called after scheme-mode-hook." | |
312 | (interactive "P") | |
313 | (if (not preserve) | |
314 | (let ((previous-mode major-mode)) | |
315 | (kill-all-local-variables) | |
316 | (make-local-variable 'xscheme-previous-mode) | |
317 | (make-local-variable 'xscheme-buffer-name) | |
318 | (make-local-variable 'xscheme-process-name) | |
319 | (make-local-variable 'xscheme-previous-process-state) | |
320 | (make-local-variable 'xscheme-runlight-string) | |
321 | (make-local-variable 'xscheme-runlight) | |
322 | (make-local-variable 'xscheme-last-input-end) | |
323 | (setq xscheme-previous-mode previous-mode) | |
324 | (let ((buffer (current-buffer))) | |
325 | (setq xscheme-buffer-name (buffer-name buffer)) | |
326 | (setq xscheme-last-input-end (make-marker)) | |
327 | (let ((process (get-buffer-process buffer))) | |
328 | (if process | |
329 | (progn | |
330 | (setq xscheme-process-name (process-name process)) | |
331 | (setq xscheme-previous-process-state | |
332 | (cons (process-filter process) | |
333 | (process-sentinel process))) | |
334 | (xscheme-process-filter-initialize t) | |
335 | (xscheme-modeline-initialize xscheme-buffer-name) | |
336 | (set-process-sentinel process 'xscheme-process-sentinel) | |
337 | (set-process-filter process 'xscheme-process-filter)) | |
338 | (setq xscheme-previous-process-state (cons nil nil))))))) | |
339 | (scheme-interaction-mode-initialize) | |
340 | (scheme-mode-variables) | |
9a969196 | 341 | (run-mode-hooks 'scheme-mode-hook 'scheme-interaction-mode-hook)) |
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342 | |
343 | (defun exit-scheme-interaction-mode () | |
344 | "Take buffer out of scheme interaction mode" | |
345 | (interactive) | |
346 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
347 | (error "Buffer not in scheme interaction mode")) | |
348 | (let ((previous-state xscheme-previous-process-state)) | |
349 | (funcall xscheme-previous-mode) | |
350 | (let ((process (get-buffer-process (current-buffer)))) | |
351 | (if process | |
352 | (progn | |
353 | (if (eq (process-filter process) 'xscheme-process-filter) | |
354 | (set-process-filter process (car previous-state))) | |
355 | (if (eq (process-sentinel process) 'xscheme-process-sentinel) | |
356 | (set-process-sentinel process (cdr previous-state)))))))) | |
357 | ||
358 | (defun scheme-interaction-mode-initialize () | |
359 | (use-local-map scheme-interaction-mode-map) | |
360 | (setq major-mode 'scheme-interaction-mode) | |
361 | (setq mode-name "Scheme Interaction")) | |
362 | ||
363 | (defun scheme-interaction-mode-commands (keymap) | |
364 | (let ((entries scheme-interaction-mode-commands-alist)) | |
365 | (while entries | |
366 | (define-key keymap | |
367 | (car (car entries)) | |
368 | (car (cdr (car entries)))) | |
369 | (setq entries (cdr entries))))) | |
370 | ||
371 | (defvar scheme-interaction-mode-commands-alist nil) | |
372 | (setq scheme-interaction-mode-commands-alist | |
373 | (append scheme-interaction-mode-commands-alist | |
374 | '(("\C-c\C-m" xscheme-send-current-line) | |
375 | ("\C-c\C-o" xscheme-delete-output) | |
376 | ("\C-c\C-p" xscheme-send-proceed) | |
377 | ("\C-c\C-y" xscheme-yank) | |
378 | ("\ep" xscheme-yank-pop) | |
379 | ("\en" xscheme-yank-push)))) | |
380 | ||
381 | (defvar scheme-interaction-mode-map nil) | |
382 | (if (not scheme-interaction-mode-map) | |
383 | (progn | |
384 | (setq scheme-interaction-mode-map (make-keymap)) | |
385 | (scheme-mode-commands scheme-interaction-mode-map) | |
386 | (xscheme-interrupt-commands scheme-interaction-mode-map) | |
387 | (xscheme-evaluation-commands scheme-interaction-mode-map) | |
388 | (scheme-interaction-mode-commands scheme-interaction-mode-map))) | |
389 | ||
390 | (defun xscheme-enter-interaction-mode () | |
391 | (save-excursion | |
392 | (set-buffer (xscheme-process-buffer)) | |
393 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
394 | (if (eq major-mode 'scheme-debugger-mode) | |
395 | (scheme-interaction-mode-initialize) | |
396 | (scheme-interaction-mode t))))) | |
397 | ||
398 | (fset 'advertised-xscheme-send-previous-expression | |
399 | 'xscheme-send-previous-expression) | |
400 | \f | |
401 | ;;;; Debugger Mode | |
402 | ||
403 | (defun scheme-debugger-mode () | |
404 | "Major mode for executing the Scheme debugger. | |
405 | Like scheme-mode except that the evaluation commands | |
406 | are disabled, and characters that would normally be self inserting are | |
407 | sent to the Scheme process instead. Typing ? will show you which | |
408 | characters perform useful functions. | |
409 | ||
410 | Commands: | |
411 | \\{scheme-debugger-mode-map}" | |
eac9c0ef | 412 | (error "Invalid entry to scheme-debugger-mode")) |
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413 | |
414 | (defun scheme-debugger-mode-initialize () | |
415 | (use-local-map scheme-debugger-mode-map) | |
416 | (setq major-mode 'scheme-debugger-mode) | |
417 | (setq mode-name "Scheme Debugger")) | |
418 | ||
419 | (defun scheme-debugger-mode-commands (keymap) | |
420 | (let ((char ? )) | |
421 | (while (< char 127) | |
422 | (define-key keymap (char-to-string char) 'scheme-debugger-self-insert) | |
423 | (setq char (1+ char))))) | |
424 | ||
425 | (defvar scheme-debugger-mode-map nil) | |
426 | (if (not scheme-debugger-mode-map) | |
427 | (progn | |
428 | (setq scheme-debugger-mode-map (make-keymap)) | |
429 | (scheme-mode-commands scheme-debugger-mode-map) | |
430 | (xscheme-interrupt-commands scheme-debugger-mode-map) | |
431 | (scheme-debugger-mode-commands scheme-debugger-mode-map))) | |
432 | ||
433 | (defun scheme-debugger-self-insert () | |
434 | "Transmit this character to the Scheme process." | |
435 | (interactive) | |
436 | (xscheme-send-char last-command-char)) | |
437 | ||
438 | (defun xscheme-enter-debugger-mode (prompt-string) | |
439 | (save-excursion | |
440 | (set-buffer (xscheme-process-buffer)) | |
441 | (if (not (eq major-mode 'scheme-debugger-mode)) | |
442 | (progn | |
443 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
444 | (scheme-interaction-mode t)) | |
445 | (scheme-debugger-mode-initialize))))) | |
446 | ||
447 | (defun xscheme-debugger-mode-p () | |
448 | (let ((buffer (xscheme-process-buffer))) | |
449 | (and buffer | |
450 | (save-excursion | |
451 | (set-buffer buffer) | |
452 | (eq major-mode 'scheme-debugger-mode))))) | |
453 | \f | |
454 | ;;;; Evaluation Commands | |
455 | ||
456 | (defun xscheme-send-string (&rest strings) | |
457 | "Send the string arguments to the Scheme process. | |
458 | The strings are concatenated and terminated by a newline." | |
459 | (cond ((not (xscheme-process-running-p)) | |
460 | (if (yes-or-no-p "The Scheme process has died. Reset it? ") | |
461 | (progn | |
462 | (reset-scheme) | |
463 | (xscheme-wait-for-process) | |
464 | (xscheme-send-string-1 strings)))) | |
465 | ((xscheme-debugger-mode-p) (error "No sends allowed in debugger mode")) | |
466 | ((and (not xscheme-allow-pipelined-evaluation) | |
467 | xscheme-running-p) | |
468 | (error "No sends allowed while Scheme running")) | |
469 | (t (xscheme-send-string-1 strings)))) | |
470 | ||
471 | (defun xscheme-send-string-1 (strings) | |
472 | (let ((string (apply 'concat strings))) | |
473 | (xscheme-send-string-2 string) | |
474 | (if (eq major-mode 'scheme-interaction-mode) | |
475 | (xscheme-insert-expression string)))) | |
476 | ||
477 | (defun xscheme-send-string-2 (string) | |
478 | (let ((process (get-process xscheme-process-name))) | |
479 | (process-send-string process (concat string "\n")) | |
480 | (if (xscheme-process-buffer-current-p) | |
481 | (set-marker (process-mark process) (point))))) | |
482 | ||
483 | (defun xscheme-select-process-buffer () | |
484 | "Select the Scheme process buffer and move to its output point." | |
485 | (interactive) | |
486 | (let ((process | |
487 | (or (get-process xscheme-process-name) | |
488 | (error "No scheme process")))) | |
489 | (let ((buffer (or (process-buffer process) (error "No process buffer")))) | |
490 | (let ((window (get-buffer-window buffer))) | |
491 | (if window | |
492 | (select-window window) | |
493 | (switch-to-buffer buffer)) | |
494 | (goto-char (process-mark process)))))) | |
495 | \f | |
496 | ;;;; Scheme expressions ring | |
497 | ||
498 | (defun xscheme-insert-expression (string) | |
499 | (setq xscheme-expressions-ring (cons string xscheme-expressions-ring)) | |
500 | (if (> (length xscheme-expressions-ring) xscheme-expressions-ring-max) | |
501 | (setcdr (nthcdr (1- xscheme-expressions-ring-max) | |
502 | xscheme-expressions-ring) | |
503 | nil)) | |
504 | (setq xscheme-expressions-ring-yank-pointer xscheme-expressions-ring)) | |
505 | ||
506 | (defun xscheme-rotate-yank-pointer (arg) | |
507 | "Rotate the yanking point in the kill ring." | |
508 | (interactive "p") | |
509 | (let ((length (length xscheme-expressions-ring))) | |
510 | (if (zerop length) | |
511 | (error "Scheme expression ring is empty") | |
512 | (setq xscheme-expressions-ring-yank-pointer | |
513 | (let ((index | |
514 | (% (+ arg | |
515 | (- length | |
516 | (length xscheme-expressions-ring-yank-pointer))) | |
517 | length))) | |
518 | (nthcdr (if (< index 0) | |
519 | (+ index length) | |
520 | index) | |
521 | xscheme-expressions-ring)))))) | |
522 | ||
523 | (defun xscheme-yank (&optional arg) | |
524 | "Insert the most recent expression at point. | |
525 | With just C-U as argument, same but put point in front (and mark at end). | |
526 | With argument n, reinsert the nth most recently sent expression. | |
527 | See also the commands \\[xscheme-yank-pop] and \\[xscheme-yank-push]." | |
528 | (interactive "*P") | |
529 | (xscheme-rotate-yank-pointer (if (listp arg) 0 | |
530 | (if (eq arg '-) -1 | |
531 | (1- arg)))) | |
532 | (push-mark (point)) | |
533 | (insert (car xscheme-expressions-ring-yank-pointer)) | |
534 | (if (consp arg) | |
535 | (exchange-point-and-mark))) | |
536 | ||
537 | ;; Old name, to avoid errors in users' init files. | |
538 | (fset 'xscheme-yank-previous-send | |
539 | 'xscheme-yank) | |
540 | ||
541 | (defun xscheme-yank-pop (arg) | |
542 | "Insert or replace a just-yanked expression with an older expression. | |
543 | If the previous command was not a yank, it yanks. | |
544 | Otherwise, the region contains a stretch of reinserted | |
545 | expression. yank-pop deletes that text and inserts in its | |
546 | place a different expression. | |
547 | ||
548 | With no argument, the next older expression is inserted. | |
549 | With argument n, the n'th older expression is inserted. | |
550 | If n is negative, this is a more recent expression. | |
551 | ||
552 | The sequence of expressions wraps around, so that after the oldest one | |
553 | comes the newest one." | |
554 | (interactive "*p") | |
555 | (setq this-command 'xscheme-yank) | |
556 | (if (not (eq last-command 'xscheme-yank)) | |
557 | (progn | |
558 | (xscheme-yank) | |
559 | (setq arg (- arg 1)))) | |
560 | (if (not (= arg 0)) | |
561 | (let ((before (< (point) (mark)))) | |
562 | (delete-region (point) (mark)) | |
563 | (xscheme-rotate-yank-pointer arg) | |
564 | (set-mark (point)) | |
565 | (insert (car xscheme-expressions-ring-yank-pointer)) | |
566 | (if before (exchange-point-and-mark))))) | |
567 | ||
568 | (defun xscheme-yank-push (arg) | |
569 | "Insert or replace a just-yanked expression with a more recent expression. | |
570 | If the previous command was not a yank, it yanks. | |
571 | Otherwise, the region contains a stretch of reinserted | |
572 | expression. yank-pop deletes that text and inserts in its | |
573 | place a different expression. | |
574 | ||
575 | With no argument, the next more recent expression is inserted. | |
576 | With argument n, the n'th more recent expression is inserted. | |
577 | If n is negative, a less recent expression is used. | |
578 | ||
579 | The sequence of expressions wraps around, so that after the oldest one | |
580 | comes the newest one." | |
581 | (interactive "*p") | |
582 | (xscheme-yank-pop (- 0 arg))) | |
583 | \f | |
584 | (defun xscheme-send-region (start end) | |
585 | "Send the current region to the Scheme process. | |
586 | The region is sent terminated by a newline." | |
587 | (interactive "r") | |
588 | (if (xscheme-process-buffer-current-p) | |
589 | (progn | |
590 | (goto-char end) | |
591 | (if (not (bolp)) | |
592 | (insert-before-markers ?\n)) | |
593 | (set-marker (process-mark (get-process xscheme-process-name)) | |
594 | (point)) | |
595 | (set-marker xscheme-last-input-end (point)))) | |
596 | (xscheme-send-string (buffer-substring start end))) | |
597 | ||
598 | (defun xscheme-send-definition () | |
599 | "Send the current definition to the Scheme process. | |
600 | If the current line begins with a non-whitespace character, | |
601 | parse an expression from the beginning of the line and send that instead." | |
602 | (interactive) | |
603 | (let ((start nil) (end nil)) | |
604 | (save-excursion | |
605 | (end-of-defun) | |
606 | (setq end (point)) | |
607 | (if (re-search-backward "^\\s(" nil t) | |
608 | (setq start (point)) | |
609 | (error "Can't find definition"))) | |
610 | (xscheme-send-region start end))) | |
611 | ||
612 | (defun xscheme-send-next-expression () | |
613 | "Send the expression to the right of `point' to the Scheme process." | |
614 | (interactive) | |
615 | (let ((start (point))) | |
616 | (xscheme-send-region start (save-excursion (forward-sexp) (point))))) | |
617 | ||
618 | (defun xscheme-send-previous-expression () | |
619 | "Send the expression to the left of `point' to the Scheme process." | |
620 | (interactive) | |
621 | (let ((end (point))) | |
622 | (xscheme-send-region (save-excursion (backward-sexp) (point)) end))) | |
623 | \f | |
624 | (defun xscheme-send-current-line () | |
625 | "Send the current line to the Scheme process. | |
626 | Useful for working with debugging Scheme under adb." | |
627 | (interactive) | |
628 | (let ((line | |
629 | (save-excursion | |
630 | (beginning-of-line) | |
631 | (let ((start (point))) | |
632 | (end-of-line) | |
633 | (buffer-substring start (point)))))) | |
634 | (end-of-line) | |
635 | (insert ?\n) | |
636 | (xscheme-send-string-2 line))) | |
637 | ||
638 | (defun xscheme-send-buffer () | |
639 | "Send the current buffer to the Scheme process." | |
640 | (interactive) | |
641 | (if (xscheme-process-buffer-current-p) | |
642 | (error "Not allowed to send this buffer's contents to Scheme")) | |
643 | (xscheme-send-region (point-min) (point-max))) | |
644 | ||
645 | (defun xscheme-send-char (char) | |
646 | "Prompt for a character and send it to the Scheme process." | |
647 | (interactive "cCharacter to send: ") | |
648 | (process-send-string xscheme-process-name (char-to-string char))) | |
649 | ||
650 | (defun xscheme-delete-output () | |
651 | "Delete all output from interpreter since last input." | |
652 | (interactive) | |
653 | (let ((proc (get-buffer-process (current-buffer)))) | |
654 | (save-excursion | |
655 | (goto-char (process-mark proc)) | |
656 | (re-search-backward | |
657 | "^;\\(Unspecified return value$\\|Value\\( [0-9]+\\)?: \\|\\(Abort\\|Up\\|Quit\\)!$\\)" | |
658 | xscheme-last-input-end | |
659 | t) | |
660 | (forward-line 0) | |
661 | (if (< (marker-position xscheme-last-input-end) (point)) | |
662 | (progn | |
663 | (delete-region xscheme-last-input-end (point)) | |
664 | (insert-before-markers "*** output flushed ***\n")))))) | |
665 | \f | |
666 | ;;;; Interrupts | |
667 | ||
668 | (defun xscheme-send-breakpoint-interrupt () | |
669 | "Cause the Scheme process to enter a breakpoint." | |
670 | (interactive) | |
671 | (xscheme-send-interrupt ?b nil)) | |
672 | ||
673 | (defun xscheme-send-proceed () | |
674 | "Cause the Scheme process to proceed from a breakpoint." | |
675 | (interactive) | |
676 | (process-send-string xscheme-process-name "(proceed)\n")) | |
677 | ||
678 | (defun xscheme-send-control-g-interrupt () | |
679 | "Cause the Scheme processor to halt and flush input. | |
680 | Control returns to the top level rep loop." | |
681 | (interactive) | |
682 | (let ((inhibit-quit t)) | |
683 | (cond ((not xscheme-control-g-synchronization-p) | |
684 | (interrupt-process xscheme-process-name)) | |
685 | ((save-excursion | |
686 | (set-buffer xscheme-buffer-name) | |
687 | xscheme-control-g-disabled-p) | |
688 | (message "Relax...")) | |
689 | (t | |
690 | (save-excursion | |
691 | (set-buffer xscheme-buffer-name) | |
692 | (setq xscheme-control-g-disabled-p t)) | |
693 | (message xscheme-control-g-message-string) | |
694 | (interrupt-process xscheme-process-name) | |
695 | (sleep-for 0.1) | |
696 | (xscheme-send-char 0))))) | |
697 | ||
698 | (defconst xscheme-control-g-message-string | |
699 | "Sending C-G interrupt to Scheme...") | |
700 | ||
701 | (defun xscheme-send-control-u-interrupt () | |
702 | "Cause the Scheme process to halt, returning to previous rep loop." | |
703 | (interactive) | |
704 | (xscheme-send-interrupt ?u t)) | |
705 | ||
706 | (defun xscheme-send-control-x-interrupt () | |
707 | "Cause the Scheme process to halt, returning to current rep loop." | |
708 | (interactive) | |
709 | (xscheme-send-interrupt ?x t)) | |
710 | ||
711 | ;;; This doesn't really work right -- Scheme just gobbles the first | |
712 | ;;; character in the input. There is no way for us to guarantee that | |
713 | ;;; the argument to this procedure is the first char unless we put | |
714 | ;;; some kind of marker in the input stream. | |
715 | ||
716 | (defun xscheme-send-interrupt (char mark-p) | |
717 | "Send a ^A type interrupt to the Scheme process." | |
718 | (interactive "cInterrupt character to send: ") | |
719 | (quit-process xscheme-process-name) | |
720 | (sleep-for 0.1) | |
721 | (xscheme-send-char char) | |
722 | (if (and mark-p xscheme-control-g-synchronization-p) | |
723 | (xscheme-send-char 0))) | |
724 | \f | |
725 | ;;;; Internal Variables | |
726 | ||
727 | (defvar xscheme-process-command-line nil | |
728 | "Command used to start the most recent Scheme process.") | |
729 | ||
730 | (defvar xscheme-process-name "scheme" | |
731 | "Name of xscheme process that we're currently interacting with.") | |
732 | ||
733 | (defvar xscheme-buffer-name "*scheme*" | |
734 | "Name of xscheme buffer that we're currently interacting with.") | |
735 | ||
736 | (defvar xscheme-expressions-ring-max 30 | |
737 | "*Maximum length of Scheme expressions ring.") | |
738 | ||
739 | (defvar xscheme-expressions-ring nil | |
740 | "List of expressions recently transmitted to the Scheme process.") | |
741 | ||
742 | (defvar xscheme-expressions-ring-yank-pointer nil | |
743 | "The tail of the Scheme expressions ring whose car is the last thing yanked.") | |
744 | ||
745 | (defvar xscheme-last-input-end) | |
746 | ||
747 | (defvar xscheme-process-filter-state 'idle | |
748 | "State of scheme process escape reader state machine: | |
749 | idle waiting for an escape sequence | |
750 | reading-type received an altmode but nothing else | |
751 | reading-string reading prompt string") | |
752 | ||
753 | (defvar xscheme-running-p nil | |
754 | "This variable, if nil, indicates that the scheme process is | |
755 | waiting for input. Otherwise, it is busy evaluating something.") | |
756 | ||
757 | (defconst xscheme-control-g-synchronization-p t | |
758 | "If non-nil, insert markers in the scheme input stream to indicate when | |
759 | control-g interrupts were signaled. Do not allow more control-g's to be | |
760 | signaled until the scheme process acknowledges receipt.") | |
761 | ||
762 | (defvar xscheme-control-g-disabled-p nil | |
763 | "This variable, if non-nil, indicates that a control-g is being processed | |
764 | by the scheme process, so additional control-g's are to be ignored.") | |
765 | ||
766 | (defvar xscheme-allow-output-p t | |
767 | "This variable, if nil, prevents output from the scheme process | |
768 | from being inserted into the process-buffer.") | |
769 | ||
770 | (defvar xscheme-prompt "" | |
771 | "The current scheme prompt string.") | |
772 | ||
773 | (defvar xscheme-string-accumulator "" | |
774 | "Accumulator for the string being received from the scheme process.") | |
775 | ||
776 | (defvar xscheme-string-receiver nil | |
777 | "Procedure to send the string argument from the scheme process.") | |
778 | ||
779 | (defconst default-xscheme-runlight | |
780 | '(": " xscheme-runlight-string) | |
781 | "Default global (shared) xscheme-runlight modeline format.") | |
782 | ||
783 | (defvar xscheme-runlight "") | |
784 | (defvar xscheme-runlight-string nil) | |
785 | (defvar xscheme-mode-string nil) | |
786 | (setq-default scheme-mode-line-process | |
787 | '("" xscheme-runlight)) | |
788 | ||
789 | (mapcar 'make-variable-buffer-local | |
790 | '(xscheme-expressions-ring | |
791 | xscheme-expressions-ring-yank-pointer | |
792 | xscheme-process-filter-state | |
793 | xscheme-running-p | |
794 | xscheme-control-g-disabled-p | |
795 | xscheme-allow-output-p | |
796 | xscheme-prompt | |
797 | xscheme-string-accumulator | |
798 | xscheme-mode-string | |
799 | scheme-mode-line-process)) | |
800 | \f | |
801 | ;;;; Basic Process Control | |
802 | ||
803 | (defun xscheme-start-process (command-line the-process the-buffer) | |
804 | (let ((buffer (get-buffer-create the-buffer))) | |
805 | (let ((process (get-buffer-process buffer))) | |
806 | (save-excursion | |
807 | (set-buffer buffer) | |
808 | (if (and process (memq (process-status process) '(run stop))) | |
809 | (set-marker (process-mark process) (point-max)) | |
810 | (progn (if process (delete-process process)) | |
811 | (goto-char (point-max)) | |
812 | (scheme-interaction-mode nil) | |
813 | (setq xscheme-process-name the-process) | |
814 | (if (bobp) | |
815 | (insert-before-markers | |
816 | (substitute-command-keys xscheme-startup-message))) | |
817 | (setq process | |
818 | (let ((process-connection-type nil)) | |
819 | (apply 'start-process | |
820 | (cons the-process | |
821 | (cons buffer | |
822 | (xscheme-parse-command-line | |
823 | command-line)))))) | |
824 | (if (not (equal (process-name process) the-process)) | |
825 | (setq xscheme-process-name (process-name process))) | |
826 | (if (not (equal (buffer-name buffer) the-buffer)) | |
827 | (setq xscheme-buffer-name (buffer-name buffer))) | |
828 | (message "Starting process %s in buffer %s" | |
829 | xscheme-process-name | |
830 | xscheme-buffer-name) | |
831 | (set-marker (process-mark process) (point-max)) | |
832 | (xscheme-process-filter-initialize t) | |
833 | (xscheme-modeline-initialize xscheme-buffer-name) | |
834 | (set-process-sentinel process 'xscheme-process-sentinel) | |
835 | (set-process-filter process 'xscheme-process-filter) | |
836 | (run-hooks 'xscheme-start-hook))))) | |
837 | buffer)) | |
838 | ||
839 | (defun xscheme-parse-command-line (string) | |
840 | (setq string (substitute-in-file-name string)) | |
841 | (let ((start 0) | |
842 | (result '())) | |
843 | (while start | |
844 | (let ((index (string-match "[ \t]" string start))) | |
845 | (setq start | |
846 | (cond ((not index) | |
847 | (setq result | |
848 | (cons (substring string start) | |
849 | result)) | |
850 | nil) | |
851 | ((= index start) | |
852 | (string-match "[^ \t]" string start)) | |
853 | (t | |
854 | (setq result | |
855 | (cons (substring string start index) | |
856 | result)) | |
857 | (1+ index)))))) | |
858 | (nreverse result))) | |
859 | \f | |
860 | (defun xscheme-wait-for-process () | |
861 | (sleep-for 2) | |
862 | (while xscheme-running-p | |
863 | (sleep-for 1))) | |
864 | ||
865 | (defun xscheme-process-running-p () | |
866 | "True iff there is a Scheme process whose status is `run'." | |
867 | (let ((process (get-process xscheme-process-name))) | |
868 | (and process | |
869 | (eq (process-status process) 'run)))) | |
870 | ||
871 | (defun xscheme-process-buffer () | |
872 | (let ((process (get-process xscheme-process-name))) | |
873 | (and process (process-buffer process)))) | |
874 | ||
875 | (defun xscheme-process-buffer-window () | |
876 | (let ((buffer (xscheme-process-buffer))) | |
877 | (and buffer (get-buffer-window buffer)))) | |
878 | ||
879 | (defun xscheme-process-buffer-current-p () | |
880 | "True iff the current buffer is the Scheme process buffer." | |
881 | (eq (xscheme-process-buffer) (current-buffer))) | |
882 | \f | |
883 | ;;;; Process Filter | |
884 | ||
885 | (defun xscheme-process-sentinel (proc reason) | |
886 | (let* ((buffer (process-buffer proc)) | |
887 | (name (buffer-name buffer))) | |
888 | (save-excursion | |
889 | (set-buffer buffer) | |
890 | (xscheme-process-filter-initialize (eq reason 'run)) | |
891 | (if (not (eq reason 'run)) | |
892 | (progn | |
893 | (setq scheme-mode-line-process "") | |
894 | (setq xscheme-mode-string "no process") | |
895 | (if (equal name (default-value 'xscheme-buffer-name)) | |
896 | (setq-default xscheme-runlight "")))) | |
897 | (if (and (not (memq reason '(run stop))) | |
898 | xscheme-signal-death-message) | |
899 | (progn | |
900 | (beep) | |
901 | (message | |
902 | "The Scheme process has died! Do M-x reset-scheme to restart it")))))) | |
903 | ||
904 | (defun xscheme-process-filter-initialize (running-p) | |
905 | (setq xscheme-process-filter-state 'idle) | |
906 | (setq xscheme-running-p running-p) | |
907 | (setq xscheme-control-g-disabled-p nil) | |
908 | (setq xscheme-allow-output-p t) | |
909 | (setq xscheme-prompt "") | |
910 | (if running-p | |
911 | (let ((name (buffer-name (current-buffer)))) | |
912 | (setq scheme-mode-line-process '(": " xscheme-runlight-string)) | |
913 | (xscheme-modeline-initialize name) | |
914 | (if (equal name (default-value 'xscheme-buffer-name)) | |
915 | (setq-default xscheme-runlight default-xscheme-runlight)))) | |
916 | (if (or (eq xscheme-runlight default-xscheme-runlight) | |
917 | (equal xscheme-runlight "")) | |
918 | (setq xscheme-runlight (list ": " 'xscheme-buffer-name ": " "?"))) | |
919 | (rplaca (nthcdr 3 xscheme-runlight) | |
920 | (if running-p "?" "no process"))) | |
921 | ||
922 | (defun xscheme-process-filter (proc string) | |
923 | (let ((xscheme-filter-input string) | |
924 | (call-noexcursion nil)) | |
925 | (while xscheme-filter-input | |
926 | (setq call-noexcursion nil) | |
927 | (save-excursion | |
928 | (set-buffer (process-buffer proc)) | |
929 | (cond ((eq xscheme-process-filter-state 'idle) | |
930 | (let ((start (string-match "\e" xscheme-filter-input))) | |
931 | (if start | |
932 | (progn | |
933 | (xscheme-process-filter-output | |
934 | (substring xscheme-filter-input 0 start)) | |
935 | (setq xscheme-filter-input | |
936 | (substring xscheme-filter-input (1+ start))) | |
937 | (setq xscheme-process-filter-state 'reading-type)) | |
938 | (let ((string xscheme-filter-input)) | |
939 | (setq xscheme-filter-input nil) | |
940 | (xscheme-process-filter-output string))))) | |
941 | ((eq xscheme-process-filter-state 'reading-type) | |
942 | (if (zerop (length xscheme-filter-input)) | |
943 | (setq xscheme-filter-input nil) | |
944 | (let ((char (aref xscheme-filter-input 0))) | |
945 | (setq xscheme-filter-input | |
946 | (substring xscheme-filter-input 1)) | |
947 | (let ((entry (assoc char xscheme-process-filter-alist))) | |
948 | (if entry | |
949 | (funcall (nth 2 entry) (nth 1 entry)) | |
950 | (progn | |
951 | (xscheme-process-filter-output ?\e char) | |
952 | (setq xscheme-process-filter-state 'idle))))))) | |
953 | ((eq xscheme-process-filter-state 'reading-string) | |
954 | (let ((start (string-match "\e" xscheme-filter-input))) | |
955 | (if start | |
956 | (let ((string | |
957 | (concat xscheme-string-accumulator | |
958 | (substring xscheme-filter-input 0 start)))) | |
959 | (setq xscheme-filter-input | |
960 | (substring xscheme-filter-input (1+ start))) | |
961 | (setq xscheme-process-filter-state 'idle) | |
962 | (if (listp xscheme-string-receiver) | |
963 | (progn | |
964 | (setq xscheme-string-receiver | |
965 | (car xscheme-string-receiver)) | |
966 | (setq call-noexcursion string)) | |
967 | (funcall xscheme-string-receiver string))) | |
968 | (progn | |
969 | (setq xscheme-string-accumulator | |
970 | (concat xscheme-string-accumulator | |
971 | xscheme-filter-input)) | |
972 | (setq xscheme-filter-input nil))))) | |
973 | (t | |
974 | (error "Scheme process filter -- bad state")))) | |
975 | (if call-noexcursion | |
976 | (funcall xscheme-string-receiver call-noexcursion))))) | |
977 | \f | |
978 | ;;;; Process Filter Output | |
979 | ||
980 | (defun xscheme-process-filter-output (&rest args) | |
981 | (if xscheme-allow-output-p | |
982 | (let ((string (apply 'concat args))) | |
983 | (save-excursion | |
984 | (xscheme-goto-output-point) | |
985 | (let ((old-point (point))) | |
986 | (while (string-match "\\(\007\\|\f\\)" string) | |
987 | (let ((start (match-beginning 0)) | |
988 | (end (match-end 0))) | |
989 | (insert-before-markers (substring string 0 start)) | |
990 | (if (= ?\f (aref string start)) | |
991 | (progn | |
992 | (if (not (bolp)) | |
993 | (insert-before-markers ?\n)) | |
994 | (insert-before-markers ?\f)) | |
995 | (beep)) | |
996 | (setq string (substring string (1+ start))))) | |
997 | (insert-before-markers string) | |
998 | (if (and xscheme-last-input-end | |
999 | (equal (marker-position xscheme-last-input-end) (point))) | |
1000 | (set-marker xscheme-last-input-end old-point))))))) | |
1001 | ||
1002 | (defun xscheme-guarantee-newlines (n) | |
1003 | (if xscheme-allow-output-p | |
1004 | (save-excursion | |
1005 | (xscheme-goto-output-point) | |
1006 | (let ((stop nil)) | |
1007 | (while (and (not stop) | |
1008 | (bolp)) | |
1009 | (setq n (1- n)) | |
1010 | (if (bobp) | |
1011 | (setq stop t) | |
1012 | (backward-char)))) | |
1013 | (xscheme-goto-output-point) | |
1014 | (while (> n 0) | |
1015 | (insert-before-markers ?\n) | |
1016 | (setq n (1- n)))))) | |
1017 | ||
1018 | (defun xscheme-goto-output-point () | |
1019 | (let ((process (get-process xscheme-process-name))) | |
1020 | (set-buffer (process-buffer process)) | |
1021 | (goto-char (process-mark process)))) | |
1022 | ||
1023 | (defun xscheme-modeline-initialize (name) | |
1024 | (setq xscheme-runlight-string "") | |
1025 | (if (equal name (default-value 'xscheme-buffer-name)) | |
1026 | (setq-default xscheme-runlight-string "")) | |
1027 | (setq xscheme-mode-string "") | |
1028 | (setq mode-line-buffer-identification | |
1029 | (list (concat name ": ") | |
1030 | 'xscheme-mode-string))) | |
1031 | ||
1032 | (defun xscheme-set-runlight (runlight) | |
1033 | (setq xscheme-runlight-string runlight) | |
1034 | (if (equal (buffer-name (current-buffer)) | |
1035 | (default-value 'xscheme-buffer-name)) | |
1036 | (setq-default xscheme-runlight-string runlight)) | |
1037 | (rplaca (nthcdr 3 xscheme-runlight) runlight) | |
1038 | (force-mode-line-update t)) | |
1039 | \f | |
1040 | ;;;; Process Filter Operations | |
1041 | ||
1042 | (defvar xscheme-process-filter-alist | |
1043 | '((?A xscheme-eval | |
1044 | xscheme-process-filter:string-action-noexcursion) | |
1045 | (?D xscheme-enter-debugger-mode | |
1046 | xscheme-process-filter:string-action) | |
1047 | (?E xscheme-eval | |
1048 | xscheme-process-filter:string-action) | |
1049 | (?P xscheme-set-prompt-variable | |
1050 | xscheme-process-filter:string-action) | |
1051 | (?R xscheme-enter-interaction-mode | |
1052 | xscheme-process-filter:simple-action) | |
1053 | (?b xscheme-start-gc | |
1054 | xscheme-process-filter:simple-action) | |
1055 | (?c xscheme-unsolicited-read-char | |
1056 | xscheme-process-filter:simple-action) | |
1057 | (?e xscheme-finish-gc | |
1058 | xscheme-process-filter:simple-action) | |
1059 | (?f xscheme-exit-input-wait | |
1060 | xscheme-process-filter:simple-action) | |
1061 | (?g xscheme-enable-control-g | |
1062 | xscheme-process-filter:simple-action) | |
1063 | (?i xscheme-prompt-for-expression | |
1064 | xscheme-process-filter:string-action) | |
1065 | (?m xscheme-message | |
1066 | xscheme-process-filter:string-action) | |
1067 | (?n xscheme-prompt-for-confirmation | |
1068 | xscheme-process-filter:string-action) | |
1069 | (?o xscheme-output-goto | |
1070 | xscheme-process-filter:simple-action) | |
1071 | (?p xscheme-set-prompt | |
1072 | xscheme-process-filter:string-action) | |
1073 | (?s xscheme-enter-input-wait | |
1074 | xscheme-process-filter:simple-action) | |
1075 | (?v xscheme-write-value | |
1076 | xscheme-process-filter:string-action) | |
1077 | (?w xscheme-cd | |
1078 | xscheme-process-filter:string-action) | |
1079 | (?z xscheme-display-process-buffer | |
1080 | xscheme-process-filter:simple-action)) | |
1081 | "Table used to decide how to handle process filter commands. | |
1082 | Value is a list of entries, each entry is a list of three items. | |
1083 | ||
1084 | The first item is the character that the process filter dispatches on. | |
1085 | The second item is the action to be taken, a function. | |
1086 | The third item is the handler for the entry, a function. | |
1087 | ||
1088 | When the process filter sees a command whose character matches a | |
1089 | particular entry, it calls the handler with two arguments: the action | |
1090 | and the string containing the rest of the process filter's input | |
1091 | stream. It is the responsibility of the handler to invoke the action | |
1092 | with the appropriate arguments, and to reenter the process filter with | |
1093 | the remaining input.") | |
1094 | \f | |
1095 | (defun xscheme-process-filter:simple-action (action) | |
1096 | (setq xscheme-process-filter-state 'idle) | |
1097 | (funcall action)) | |
1098 | ||
1099 | (defun xscheme-process-filter:string-action (action) | |
1100 | (setq xscheme-string-receiver action) | |
1101 | (setq xscheme-string-accumulator "") | |
1102 | (setq xscheme-process-filter-state 'reading-string)) | |
1103 | ||
1104 | (defun xscheme-process-filter:string-action-noexcursion (action) | |
1105 | (xscheme-process-filter:string-action (cons action nil))) | |
1106 | ||
1107 | (defconst xscheme-runlight:running "run" | |
1108 | "The character displayed when the Scheme process is running.") | |
1109 | ||
1110 | (defconst xscheme-runlight:input "input" | |
1111 | "The character displayed when the Scheme process is waiting for input.") | |
1112 | ||
1113 | (defconst xscheme-runlight:gc "gc" | |
1114 | "The character displayed when the Scheme process is garbage collecting.") | |
1115 | ||
1116 | (defun xscheme-start-gc () | |
1117 | (xscheme-set-runlight xscheme-runlight:gc)) | |
1118 | ||
1119 | (defun xscheme-finish-gc () | |
1120 | (xscheme-set-runlight | |
1121 | (if xscheme-running-p xscheme-runlight:running xscheme-runlight:input))) | |
1122 | ||
1123 | (defun xscheme-enter-input-wait () | |
1124 | (xscheme-set-runlight xscheme-runlight:input) | |
1125 | (setq xscheme-control-g-disabled-p nil) | |
1126 | (setq xscheme-running-p nil)) | |
1127 | ||
1128 | (defun xscheme-exit-input-wait () | |
1129 | (xscheme-set-runlight xscheme-runlight:running) | |
1130 | (setq xscheme-running-p t)) | |
1131 | ||
1132 | (defun xscheme-enable-control-g () | |
1133 | (setq xscheme-control-g-disabled-p nil) | |
1134 | (if (string= (current-message) xscheme-control-g-message-string) | |
1135 | (message nil))) | |
1136 | ||
1137 | (defun xscheme-display-process-buffer () | |
1138 | (let ((window (or (xscheme-process-buffer-window) | |
1139 | (display-buffer (xscheme-process-buffer))))) | |
1140 | (save-window-excursion | |
1141 | (select-window window) | |
1142 | (xscheme-goto-output-point) | |
1143 | (if (xscheme-debugger-mode-p) | |
1144 | (xscheme-enter-interaction-mode))))) | |
1145 | ||
1146 | (defun xscheme-unsolicited-read-char () | |
1147 | nil) | |
1148 | \f | |
1149 | (defun xscheme-eval (string) | |
1150 | (eval (car (read-from-string string)))) | |
1151 | ||
1152 | (defun xscheme-message (string) | |
1153 | (if (not (zerop (length string))) | |
1154 | (xscheme-write-message-1 string (format ";%s" string)))) | |
1155 | ||
1156 | (defun xscheme-write-value (string) | |
1157 | (if (zerop (length string)) | |
1158 | (xscheme-write-message-1 "(no value)" ";Unspecified return value") | |
1159 | (xscheme-write-message-1 string (format ";Value: %s" string)))) | |
1160 | ||
1161 | (defun xscheme-write-message-1 (message-string output-string) | |
1162 | (let* ((process (get-process xscheme-process-name)) | |
1163 | (window (get-buffer-window (process-buffer process)))) | |
1164 | (if (or (not window) | |
1165 | (not (pos-visible-in-window-p (process-mark process) | |
1166 | window))) | |
1167 | (message "%s" message-string))) | |
1168 | (xscheme-guarantee-newlines 1) | |
1169 | (xscheme-process-filter-output output-string)) | |
1170 | ||
1171 | (defun xscheme-set-prompt-variable (string) | |
1172 | (setq xscheme-prompt string)) | |
1173 | ||
1174 | (defun xscheme-set-prompt (string) | |
1175 | (setq xscheme-prompt string) | |
1176 | (xscheme-guarantee-newlines 2) | |
1177 | (setq xscheme-mode-string (xscheme-coerce-prompt string)) | |
1178 | (force-mode-line-update t)) | |
1179 | ||
1180 | (defun xscheme-output-goto () | |
1181 | (xscheme-goto-output-point) | |
1182 | (xscheme-guarantee-newlines 2)) | |
1183 | ||
1184 | (defun xscheme-coerce-prompt (string) | |
1185 | (if (string-match "^[0-9]+ \\[[^]]+\\] " string) | |
1186 | (let ((end (match-end 0))) | |
1187 | (xscheme-process-filter-output (substring string end)) | |
1188 | (substring string 0 (- end 1))) | |
1189 | string)) | |
1190 | ||
1191 | (defun xscheme-cd (directory-string) | |
1192 | (save-excursion | |
1193 | (set-buffer (xscheme-process-buffer)) | |
1194 | (cd directory-string))) | |
1195 | \f | |
1196 | (defun xscheme-prompt-for-confirmation (prompt-string) | |
1197 | (xscheme-send-char (if (y-or-n-p prompt-string) ?y ?n))) | |
1198 | ||
1199 | (defun xscheme-prompt-for-expression (prompt-string) | |
1200 | (xscheme-send-string-2 | |
1201 | (read-from-minibuffer prompt-string nil xscheme-prompt-for-expression-map))) | |
1202 | ||
1203 | (defvar xscheme-prompt-for-expression-map nil) | |
1204 | (if (not xscheme-prompt-for-expression-map) | |
1205 | (progn | |
1206 | (setq xscheme-prompt-for-expression-map | |
1207 | (copy-keymap minibuffer-local-map)) | |
1208 | (substitute-key-definition 'exit-minibuffer | |
1209 | 'xscheme-prompt-for-expression-exit | |
1210 | xscheme-prompt-for-expression-map))) | |
1211 | ||
1212 | (defun xscheme-prompt-for-expression-exit () | |
1213 | (interactive) | |
1214 | (if (eq (xscheme-region-expression-p (point-min) (point-max)) 'one) | |
1215 | (exit-minibuffer) | |
1216 | (error "input must be a single, complete expression"))) | |
1217 | ||
1218 | (defun xscheme-region-expression-p (start end) | |
1219 | (save-excursion | |
1220 | (let ((old-syntax-table (syntax-table))) | |
1221 | (unwind-protect | |
1222 | (progn | |
1223 | (set-syntax-table scheme-mode-syntax-table) | |
1224 | (let ((state (parse-partial-sexp start end))) | |
1225 | (and (zerop (car state)) ;depth = 0 | |
1226 | (nth 2 state) ;last-sexp exists, i.e. >= 1 sexps | |
1227 | (let ((state (parse-partial-sexp start (nth 2 state)))) | |
1228 | (if (nth 2 state) 'many 'one))))) | |
1229 | (set-syntax-table old-syntax-table))))) | |
1230 | ||
1231 | (provide 'xscheme) | |
1232 | ||
ab5796a9 | 1233 | ;;; arch-tag: cfc14adc-2917-409e-ad16-432e8d0017de |
c5c3d778 | 1234 | ;;; xscheme.el ends here |