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1 | ;;; xscheme.el --- run MIT Scheme under Emacs |
2 | ||
4e643dd2 | 3 | ;; Copyright (C) 1986, 1987, 1989, 1990, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
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 | |
1a484753 | 13 | ;; the Free Software Foundation; either version 3, or (at your option) |
c5c3d778 DL |
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) | |
f28d4b0f JB |
36 | |
37 | ;;;; Internal Variables | |
38 | ||
39 | (defvar xscheme-previous-mode) | |
40 | (defvar xscheme-previous-process-state) | |
41 | (defvar xscheme-last-input-end) | |
42 | ||
43 | (defvar xscheme-process-command-line nil | |
44 | "Command used to start the most recent Scheme process.") | |
45 | ||
46 | (defvar xscheme-process-name "scheme" | |
47 | "Name of xscheme process that we're currently interacting with.") | |
48 | ||
49 | (defvar xscheme-buffer-name "*scheme*" | |
50 | "Name of xscheme buffer that we're currently interacting with.") | |
51 | ||
52 | (defvar xscheme-expressions-ring-max 30 | |
53 | "*Maximum length of Scheme expressions ring.") | |
54 | ||
55 | (defvar xscheme-expressions-ring nil | |
56 | "List of expressions recently transmitted to the Scheme process.") | |
57 | ||
58 | (defvar xscheme-expressions-ring-yank-pointer nil | |
59 | "The tail of the Scheme expressions ring whose car is the last thing yanked.") | |
60 | ||
61 | (defvar xscheme-running-p nil | |
62 | "This variable, if nil, indicates that the scheme process is | |
63 | waiting for input. Otherwise, it is busy evaluating something.") | |
64 | ||
65 | (defconst xscheme-control-g-synchronization-p t | |
66 | "If non-nil, insert markers in the scheme input stream to indicate when | |
67 | control-g interrupts were signaled. Do not allow more control-g's to be | |
68 | signaled until the scheme process acknowledges receipt.") | |
69 | ||
70 | (defvar xscheme-control-g-disabled-p nil | |
71 | "This variable, if non-nil, indicates that a control-g is being processed | |
72 | by the scheme process, so additional control-g's are to be ignored.") | |
73 | ||
74 | (defvar xscheme-string-receiver nil | |
75 | "Procedure to send the string argument from the scheme process.") | |
76 | ||
77 | (defconst default-xscheme-runlight | |
78 | '(": " xscheme-runlight-string) | |
79 | "Default global (shared) xscheme-runlight modeline format.") | |
80 | ||
81 | (defvar xscheme-runlight "") | |
82 | (defvar xscheme-runlight-string nil) | |
83 | ||
84 | (defvar xscheme-process-filter-state 'idle | |
85 | "State of scheme process escape reader state machine: | |
86 | idle waiting for an escape sequence | |
87 | reading-type received an altmode but nothing else | |
88 | reading-string reading prompt string") | |
89 | ||
90 | (defvar xscheme-allow-output-p t | |
91 | "This variable, if nil, prevents output from the scheme process | |
92 | from being inserted into the process-buffer.") | |
93 | ||
94 | (defvar xscheme-prompt "" | |
95 | "The current scheme prompt string.") | |
96 | ||
97 | (defvar xscheme-string-accumulator "" | |
98 | "Accumulator for the string being received from the scheme process.") | |
99 | ||
100 | (defvar xscheme-mode-string nil) | |
101 | (setq-default scheme-mode-line-process | |
102 | '("" xscheme-runlight)) | |
103 | ||
e2c527c5 JB |
104 | (mapc 'make-variable-buffer-local |
105 | '(xscheme-expressions-ring | |
106 | xscheme-expressions-ring-yank-pointer | |
107 | xscheme-process-filter-state | |
108 | xscheme-running-p | |
109 | xscheme-control-g-disabled-p | |
110 | xscheme-allow-output-p | |
111 | xscheme-prompt | |
112 | xscheme-string-accumulator | |
113 | xscheme-mode-string | |
114 | scheme-mode-line-process)) | |
c5c3d778 DL |
115 | \f |
116 | (defgroup xscheme nil | |
117 | "Major mode for editing Scheme and interacting with MIT's C-Scheme." | |
118 | :group 'lisp) | |
119 | ||
120 | (defcustom scheme-band-name nil | |
121 | "*Band loaded by the `run-scheme' command." | |
122 | :type '(choice (const nil) string) | |
123 | :group 'xscheme) | |
124 | ||
125 | (defcustom scheme-program-arguments nil | |
126 | "*Arguments passed to the Scheme program by the `run-scheme' command." | |
127 | :type '(choice (const nil) string) | |
128 | :group 'xscheme) | |
129 | ||
130 | (defcustom xscheme-allow-pipelined-evaluation t | |
131 | "If non-nil, an expression may be transmitted while another is evaluating. | |
132 | Otherwise, attempting to evaluate an expression before the previous expression | |
133 | has finished evaluating will signal an error." | |
134 | :type 'boolean | |
135 | :group 'xscheme) | |
136 | ||
137 | (defcustom xscheme-startup-message | |
138 | "This is the Scheme process buffer. | |
139 | Type \\[advertised-xscheme-send-previous-expression] to evaluate the expression before point. | |
140 | Type \\[xscheme-send-control-g-interrupt] to abort evaluation. | |
141 | Type \\[describe-mode] for more information. | |
142 | ||
143 | " | |
144 | "String to insert into Scheme process buffer first time it is started. | |
145 | Is processed with `substitute-command-keys' first." | |
146 | :type 'string | |
147 | :group 'xscheme) | |
148 | ||
149 | (defcustom xscheme-signal-death-message nil | |
150 | "If non-nil, causes a message to be generated when the Scheme process dies." | |
151 | :type 'boolean | |
152 | :group 'xscheme) | |
153 | ||
154 | (defcustom xscheme-start-hook nil | |
155 | "If non-nil, a procedure to call when the Scheme process is started. | |
156 | When called, the current buffer will be the Scheme process-buffer." | |
157 | :type 'hook | |
158 | :group 'xscheme | |
159 | :version "20.3") | |
160 | ||
161 | (defun xscheme-evaluation-commands (keymap) | |
162 | (define-key keymap "\e\C-x" 'xscheme-send-definition) | |
163 | (define-key keymap "\C-x\C-e" 'advertised-xscheme-send-previous-expression) | |
164 | (define-key keymap "\eo" 'xscheme-send-buffer) | |
165 | (define-key keymap "\ez" 'xscheme-send-definition) | |
166 | (define-key keymap "\e\C-m" 'xscheme-send-previous-expression) | |
167 | (define-key keymap "\e\C-z" 'xscheme-send-region)) | |
168 | ||
169 | (defun xscheme-interrupt-commands (keymap) | |
170 | (define-key keymap "\C-c\C-s" 'xscheme-select-process-buffer) | |
171 | (define-key keymap "\C-c\C-b" 'xscheme-send-breakpoint-interrupt) | |
172 | (define-key keymap "\C-c\C-c" 'xscheme-send-control-g-interrupt) | |
173 | (define-key keymap "\C-c\C-u" 'xscheme-send-control-u-interrupt) | |
174 | (define-key keymap "\C-c\C-x" 'xscheme-send-control-x-interrupt)) | |
175 | ||
176 | (xscheme-evaluation-commands scheme-mode-map) | |
177 | (xscheme-interrupt-commands scheme-mode-map) | |
178 | \f | |
179 | (defun run-scheme (command-line) | |
180 | "Run MIT Scheme in an inferior process. | |
181 | Output goes to the buffer `*scheme*'. | |
182 | With argument, asks for a command line." | |
183 | (interactive (list (xscheme-read-command-line current-prefix-arg))) | |
184 | (xscheme-start command-line xscheme-process-name xscheme-buffer-name)) | |
185 | ||
186 | (defun xscheme-start (command-line process-name buffer-name) | |
187 | (setq-default xscheme-process-command-line command-line) | |
188 | (switch-to-buffer | |
189 | (xscheme-start-process command-line process-name buffer-name)) | |
190 | (make-local-variable 'xscheme-process-command-line) | |
191 | (setq xscheme-process-command-line command-line)) | |
192 | ||
193 | (defun xscheme-read-command-line (arg) | |
194 | (let ((default | |
195 | (or xscheme-process-command-line | |
196 | (xscheme-default-command-line)))) | |
197 | (if arg | |
198 | (read-string "Run Scheme: " default) | |
199 | default))) | |
200 | ||
201 | (defun xscheme-default-command-line () | |
202 | (concat scheme-program-name " -emacs" | |
203 | (if scheme-program-arguments | |
204 | (concat " " scheme-program-arguments) | |
205 | "") | |
206 | (if scheme-band-name | |
207 | (concat " -band " scheme-band-name) | |
208 | ""))) | |
209 | ||
210 | (defun reset-scheme () | |
211 | "Reset the Scheme process." | |
212 | (interactive) | |
213 | (let ((process (get-process xscheme-process-name))) | |
214 | (cond ((or (not process) | |
215 | (not (eq (process-status process) 'run)) | |
216 | (yes-or-no-p | |
217 | "The Scheme process is running, are you SURE you want to reset it? ")) | |
218 | (message "Resetting Scheme process...") | |
219 | (if process | |
220 | (progn | |
221 | (kill-process process t) | |
222 | (delete-process process))) | |
223 | (xscheme-start-process xscheme-process-command-line | |
224 | xscheme-process-name | |
225 | xscheme-buffer-name) | |
226 | (message "Resetting Scheme process...done"))))) | |
227 | \f | |
228 | ;;;; Multiple Scheme buffer management commands | |
229 | ||
230 | (defun start-scheme (buffer-name &optional globally) | |
231 | "Choose a scheme interaction buffer, or create a new one." | |
232 | ;; (interactive "BScheme interaction buffer: \nP") | |
233 | (interactive | |
234 | (list (read-buffer "Scheme interaction buffer: " | |
235 | xscheme-buffer-name | |
236 | nil) | |
237 | current-prefix-arg)) | |
238 | (let ((buffer (get-buffer-create buffer-name))) | |
239 | (let ((process (get-buffer-process buffer))) | |
240 | (if process | |
241 | (switch-to-buffer buffer) | |
242 | (if (or (not (buffer-file-name buffer)) | |
243 | (yes-or-no-p (concat "Buffer " | |
244 | (buffer-name buffer) | |
245 | " contains file " | |
246 | (buffer-file-name buffer) | |
247 | "; start scheme in it? "))) | |
248 | (progn | |
249 | (xscheme-start (xscheme-read-command-line t) | |
250 | buffer-name | |
251 | buffer-name) | |
252 | (if globally | |
253 | (global-set-scheme-interaction-buffer buffer-name))) | |
254 | (message "start-scheme aborted")))))) | |
255 | ||
256 | (fset 'select-scheme 'start-scheme) | |
257 | ||
258 | (defun global-set-scheme-interaction-buffer (buffer-name) | |
259 | "Set the default scheme interaction buffer." | |
260 | (interactive | |
261 | (list (read-buffer "Scheme interaction buffer: " | |
262 | xscheme-buffer-name | |
263 | t))) | |
264 | (let ((process-name (verify-xscheme-buffer buffer-name nil))) | |
265 | (setq-default xscheme-buffer-name buffer-name) | |
266 | (setq-default xscheme-process-name process-name) | |
267 | (setq-default xscheme-runlight-string | |
268 | (save-excursion (set-buffer buffer-name) | |
269 | xscheme-runlight-string)) | |
270 | (setq-default xscheme-runlight | |
271 | (if (eq (process-status process-name) 'run) | |
272 | default-xscheme-runlight | |
273 | "")))) | |
274 | ||
275 | (defun local-set-scheme-interaction-buffer (buffer-name) | |
276 | "Set the scheme interaction buffer for the current buffer." | |
277 | (interactive | |
278 | (list (read-buffer "Scheme interaction buffer: " | |
279 | xscheme-buffer-name | |
280 | t))) | |
281 | (let ((process-name (verify-xscheme-buffer buffer-name t))) | |
282 | (make-local-variable 'xscheme-buffer-name) | |
283 | (setq xscheme-buffer-name buffer-name) | |
284 | (make-local-variable 'xscheme-process-name) | |
285 | (setq xscheme-process-name process-name) | |
286 | (make-local-variable 'xscheme-runlight) | |
287 | (setq xscheme-runlight (save-excursion (set-buffer buffer-name) | |
288 | xscheme-runlight)))) | |
289 | ||
290 | (defun local-clear-scheme-interaction-buffer () | |
291 | "Make the current buffer use the default scheme interaction buffer." | |
292 | (interactive) | |
293 | (if (xscheme-process-buffer-current-p) | |
294 | (error "Cannot change the interaction buffer of an interaction buffer")) | |
295 | (kill-local-variable 'xscheme-buffer-name) | |
296 | (kill-local-variable 'xscheme-process-name) | |
297 | (kill-local-variable 'xscheme-runlight)) | |
298 | ||
299 | (defun verify-xscheme-buffer (buffer-name localp) | |
300 | (if (and localp (xscheme-process-buffer-current-p)) | |
301 | (error "Cannot change the interaction buffer of an interaction buffer")) | |
302 | (let* ((buffer (get-buffer buffer-name)) | |
303 | (process (and buffer (get-buffer-process buffer)))) | |
304 | (cond ((not buffer) | |
ac72d80b | 305 | (error "Buffer `%s' does not exist" buffer-name)) |
c5c3d778 | 306 | ((not process) |
ac72d80b | 307 | (error "Buffer `%s' is not a scheme interaction buffer" buffer-name)) |
c5c3d778 DL |
308 | (t |
309 | (save-excursion | |
310 | (set-buffer buffer) | |
311 | (if (not (xscheme-process-buffer-current-p)) | |
ac72d80b | 312 | (error "Buffer `%s' is not a scheme interaction buffer" |
c5c3d778 DL |
313 | buffer-name))) |
314 | (process-name process))))) | |
315 | \f | |
316 | ;;;; Interaction Mode | |
317 | ||
318 | (defun scheme-interaction-mode (&optional preserve) | |
319 | "Major mode for interacting with an inferior MIT Scheme process. | |
320 | Like scheme-mode except that: | |
321 | ||
322 | \\[advertised-xscheme-send-previous-expression] sends the expression before point to the Scheme process as input | |
323 | \\[xscheme-yank-pop] yanks an expression previously sent to Scheme | |
324 | \\[xscheme-yank-push] yanks an expression more recently sent to Scheme | |
325 | ||
326 | All output from the Scheme process is written in the Scheme process | |
327 | buffer, which is initially named \"*scheme*\". The result of | |
328 | evaluating a Scheme expression is also printed in the process buffer, | |
329 | preceded by the string \";Value: \" to highlight it. If the process | |
330 | buffer is not visible at that time, the value will also be displayed | |
331 | in the minibuffer. If an error occurs, the process buffer will | |
332 | automatically pop up to show you the error message. | |
333 | ||
334 | While the Scheme process is running, the modelines of all buffers in | |
335 | scheme-mode are modified to show the state of the process. The | |
336 | possible states and their meanings are: | |
337 | ||
338 | input waiting for input | |
339 | run evaluating | |
340 | gc garbage collecting | |
341 | ||
342 | The process buffer's modeline contains additional information where | |
343 | the buffer's name is normally displayed: the command interpreter level | |
344 | and type. | |
345 | ||
346 | Scheme maintains a stack of command interpreters. Every time an error | |
347 | or breakpoint occurs, the current command interpreter is pushed on the | |
348 | command interpreter stack, and a new command interpreter is started. | |
349 | One example of why this is done is so that an error that occurs while | |
350 | you are debugging another error will not destroy the state of the | |
351 | initial error, allowing you to return to it after the second error has | |
352 | been fixed. | |
353 | ||
354 | The command interpreter level indicates how many interpreters are in | |
355 | the command interpreter stack. It is initially set to one, and it is | |
356 | incremented every time that stack is pushed, and decremented every | |
357 | time it is popped. The following commands are useful for manipulating | |
358 | the command interpreter stack: | |
359 | ||
360 | \\[xscheme-send-breakpoint-interrupt] pushes the stack once | |
361 | \\[xscheme-send-control-u-interrupt] pops the stack once | |
362 | \\[xscheme-send-control-g-interrupt] pops everything off | |
363 | \\[xscheme-send-control-x-interrupt] aborts evaluation, doesn't affect stack | |
364 | ||
365 | Some possible command interpreter types and their meanings are: | |
366 | ||
367 | \[Evaluator] read-eval-print loop for evaluating expressions | |
368 | \[Debugger] single character commands for debugging errors | |
369 | \[Where] single character commands for examining environments | |
370 | ||
371 | Starting with release 6.2 of Scheme, the latter two types of command | |
372 | interpreters will change the major mode of the Scheme process buffer | |
373 | to scheme-debugger-mode , in which the evaluation commands are | |
374 | disabled, and the keys which normally self insert instead send | |
375 | themselves to the Scheme process. The command character ? will list | |
376 | the available commands. | |
377 | ||
378 | For older releases of Scheme, the major mode will be be | |
379 | scheme-interaction-mode , and the command characters must be sent as | |
380 | if they were expressions. | |
381 | ||
382 | Commands: | |
383 | Delete converts tabs to spaces as it moves back. | |
384 | Blank lines separate paragraphs. Semicolons start comments. | |
385 | \\{scheme-interaction-mode-map} | |
386 | ||
387 | Entry to this mode calls the value of scheme-interaction-mode-hook | |
388 | with no args, if that value is non-nil. | |
389 | Likewise with the value of scheme-mode-hook. | |
390 | scheme-interaction-mode-hook is called after scheme-mode-hook." | |
391 | (interactive "P") | |
392 | (if (not preserve) | |
393 | (let ((previous-mode major-mode)) | |
394 | (kill-all-local-variables) | |
395 | (make-local-variable 'xscheme-previous-mode) | |
396 | (make-local-variable 'xscheme-buffer-name) | |
397 | (make-local-variable 'xscheme-process-name) | |
398 | (make-local-variable 'xscheme-previous-process-state) | |
399 | (make-local-variable 'xscheme-runlight-string) | |
400 | (make-local-variable 'xscheme-runlight) | |
401 | (make-local-variable 'xscheme-last-input-end) | |
402 | (setq xscheme-previous-mode previous-mode) | |
403 | (let ((buffer (current-buffer))) | |
404 | (setq xscheme-buffer-name (buffer-name buffer)) | |
405 | (setq xscheme-last-input-end (make-marker)) | |
406 | (let ((process (get-buffer-process buffer))) | |
407 | (if process | |
408 | (progn | |
409 | (setq xscheme-process-name (process-name process)) | |
410 | (setq xscheme-previous-process-state | |
411 | (cons (process-filter process) | |
412 | (process-sentinel process))) | |
413 | (xscheme-process-filter-initialize t) | |
414 | (xscheme-modeline-initialize xscheme-buffer-name) | |
415 | (set-process-sentinel process 'xscheme-process-sentinel) | |
416 | (set-process-filter process 'xscheme-process-filter)) | |
417 | (setq xscheme-previous-process-state (cons nil nil))))))) | |
418 | (scheme-interaction-mode-initialize) | |
419 | (scheme-mode-variables) | |
9a969196 | 420 | (run-mode-hooks 'scheme-mode-hook 'scheme-interaction-mode-hook)) |
c5c3d778 DL |
421 | |
422 | (defun exit-scheme-interaction-mode () | |
423 | "Take buffer out of scheme interaction mode" | |
424 | (interactive) | |
425 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
426 | (error "Buffer not in scheme interaction mode")) | |
427 | (let ((previous-state xscheme-previous-process-state)) | |
428 | (funcall xscheme-previous-mode) | |
429 | (let ((process (get-buffer-process (current-buffer)))) | |
430 | (if process | |
431 | (progn | |
432 | (if (eq (process-filter process) 'xscheme-process-filter) | |
433 | (set-process-filter process (car previous-state))) | |
434 | (if (eq (process-sentinel process) 'xscheme-process-sentinel) | |
435 | (set-process-sentinel process (cdr previous-state)))))))) | |
436 | ||
f28d4b0f JB |
437 | (defvar scheme-interaction-mode-commands-alist nil) |
438 | (defvar scheme-interaction-mode-map nil) | |
439 | ||
c5c3d778 DL |
440 | (defun scheme-interaction-mode-initialize () |
441 | (use-local-map scheme-interaction-mode-map) | |
442 | (setq major-mode 'scheme-interaction-mode) | |
443 | (setq mode-name "Scheme Interaction")) | |
444 | ||
445 | (defun scheme-interaction-mode-commands (keymap) | |
446 | (let ((entries scheme-interaction-mode-commands-alist)) | |
447 | (while entries | |
448 | (define-key keymap | |
449 | (car (car entries)) | |
450 | (car (cdr (car entries)))) | |
451 | (setq entries (cdr entries))))) | |
452 | ||
f28d4b0f | 453 | ;; Initialize the command alist |
c5c3d778 DL |
454 | (setq scheme-interaction-mode-commands-alist |
455 | (append scheme-interaction-mode-commands-alist | |
456 | '(("\C-c\C-m" xscheme-send-current-line) | |
457 | ("\C-c\C-o" xscheme-delete-output) | |
458 | ("\C-c\C-p" xscheme-send-proceed) | |
459 | ("\C-c\C-y" xscheme-yank) | |
460 | ("\ep" xscheme-yank-pop) | |
461 | ("\en" xscheme-yank-push)))) | |
462 | ||
f28d4b0f | 463 | ;; Initialize the mode map |
c5c3d778 DL |
464 | (if (not scheme-interaction-mode-map) |
465 | (progn | |
466 | (setq scheme-interaction-mode-map (make-keymap)) | |
467 | (scheme-mode-commands scheme-interaction-mode-map) | |
468 | (xscheme-interrupt-commands scheme-interaction-mode-map) | |
469 | (xscheme-evaluation-commands scheme-interaction-mode-map) | |
470 | (scheme-interaction-mode-commands scheme-interaction-mode-map))) | |
471 | ||
472 | (defun xscheme-enter-interaction-mode () | |
473 | (save-excursion | |
474 | (set-buffer (xscheme-process-buffer)) | |
475 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
476 | (if (eq major-mode 'scheme-debugger-mode) | |
477 | (scheme-interaction-mode-initialize) | |
478 | (scheme-interaction-mode t))))) | |
479 | ||
480 | (fset 'advertised-xscheme-send-previous-expression | |
481 | 'xscheme-send-previous-expression) | |
482 | \f | |
483 | ;;;; Debugger Mode | |
484 | ||
485 | (defun scheme-debugger-mode () | |
486 | "Major mode for executing the Scheme debugger. | |
487 | Like scheme-mode except that the evaluation commands | |
488 | are disabled, and characters that would normally be self inserting are | |
489 | sent to the Scheme process instead. Typing ? will show you which | |
490 | characters perform useful functions. | |
491 | ||
492 | Commands: | |
493 | \\{scheme-debugger-mode-map}" | |
eac9c0ef | 494 | (error "Invalid entry to scheme-debugger-mode")) |
c5c3d778 | 495 | |
f28d4b0f JB |
496 | (defvar scheme-debugger-mode-map nil) |
497 | ||
c5c3d778 DL |
498 | (defun scheme-debugger-mode-initialize () |
499 | (use-local-map scheme-debugger-mode-map) | |
500 | (setq major-mode 'scheme-debugger-mode) | |
501 | (setq mode-name "Scheme Debugger")) | |
502 | ||
503 | (defun scheme-debugger-mode-commands (keymap) | |
f28d4b0f | 504 | (let ((char ?\s)) |
c5c3d778 DL |
505 | (while (< char 127) |
506 | (define-key keymap (char-to-string char) 'scheme-debugger-self-insert) | |
507 | (setq char (1+ char))))) | |
508 | ||
f28d4b0f | 509 | ;; Initialize the debugger mode map |
c5c3d778 DL |
510 | (if (not scheme-debugger-mode-map) |
511 | (progn | |
512 | (setq scheme-debugger-mode-map (make-keymap)) | |
513 | (scheme-mode-commands scheme-debugger-mode-map) | |
514 | (xscheme-interrupt-commands scheme-debugger-mode-map) | |
515 | (scheme-debugger-mode-commands scheme-debugger-mode-map))) | |
516 | ||
517 | (defun scheme-debugger-self-insert () | |
518 | "Transmit this character to the Scheme process." | |
519 | (interactive) | |
520 | (xscheme-send-char last-command-char)) | |
521 | ||
522 | (defun xscheme-enter-debugger-mode (prompt-string) | |
523 | (save-excursion | |
524 | (set-buffer (xscheme-process-buffer)) | |
525 | (if (not (eq major-mode 'scheme-debugger-mode)) | |
526 | (progn | |
527 | (if (not (eq major-mode 'scheme-interaction-mode)) | |
528 | (scheme-interaction-mode t)) | |
529 | (scheme-debugger-mode-initialize))))) | |
530 | ||
531 | (defun xscheme-debugger-mode-p () | |
532 | (let ((buffer (xscheme-process-buffer))) | |
533 | (and buffer | |
534 | (save-excursion | |
535 | (set-buffer buffer) | |
536 | (eq major-mode 'scheme-debugger-mode))))) | |
537 | \f | |
538 | ;;;; Evaluation Commands | |
539 | ||
540 | (defun xscheme-send-string (&rest strings) | |
541 | "Send the string arguments to the Scheme process. | |
542 | The strings are concatenated and terminated by a newline." | |
543 | (cond ((not (xscheme-process-running-p)) | |
544 | (if (yes-or-no-p "The Scheme process has died. Reset it? ") | |
545 | (progn | |
546 | (reset-scheme) | |
547 | (xscheme-wait-for-process) | |
548 | (xscheme-send-string-1 strings)))) | |
549 | ((xscheme-debugger-mode-p) (error "No sends allowed in debugger mode")) | |
550 | ((and (not xscheme-allow-pipelined-evaluation) | |
551 | xscheme-running-p) | |
552 | (error "No sends allowed while Scheme running")) | |
553 | (t (xscheme-send-string-1 strings)))) | |
554 | ||
555 | (defun xscheme-send-string-1 (strings) | |
556 | (let ((string (apply 'concat strings))) | |
557 | (xscheme-send-string-2 string) | |
558 | (if (eq major-mode 'scheme-interaction-mode) | |
559 | (xscheme-insert-expression string)))) | |
560 | ||
561 | (defun xscheme-send-string-2 (string) | |
562 | (let ((process (get-process xscheme-process-name))) | |
563 | (process-send-string process (concat string "\n")) | |
564 | (if (xscheme-process-buffer-current-p) | |
565 | (set-marker (process-mark process) (point))))) | |
566 | ||
567 | (defun xscheme-select-process-buffer () | |
568 | "Select the Scheme process buffer and move to its output point." | |
569 | (interactive) | |
570 | (let ((process | |
571 | (or (get-process xscheme-process-name) | |
572 | (error "No scheme process")))) | |
573 | (let ((buffer (or (process-buffer process) (error "No process buffer")))) | |
574 | (let ((window (get-buffer-window buffer))) | |
575 | (if window | |
576 | (select-window window) | |
577 | (switch-to-buffer buffer)) | |
578 | (goto-char (process-mark process)))))) | |
579 | \f | |
580 | ;;;; Scheme expressions ring | |
581 | ||
582 | (defun xscheme-insert-expression (string) | |
662705b1 KS |
583 | (setq xscheme-expressions-ring-yank-pointer |
584 | (add-to-history 'xscheme-expressions-ring string | |
585 | xscheme-expressions-ring-max))) | |
c5c3d778 DL |
586 | |
587 | (defun xscheme-rotate-yank-pointer (arg) | |
588 | "Rotate the yanking point in the kill ring." | |
589 | (interactive "p") | |
590 | (let ((length (length xscheme-expressions-ring))) | |
591 | (if (zerop length) | |
592 | (error "Scheme expression ring is empty") | |
593 | (setq xscheme-expressions-ring-yank-pointer | |
594 | (let ((index | |
595 | (% (+ arg | |
596 | (- length | |
597 | (length xscheme-expressions-ring-yank-pointer))) | |
598 | length))) | |
599 | (nthcdr (if (< index 0) | |
600 | (+ index length) | |
601 | index) | |
602 | xscheme-expressions-ring)))))) | |
603 | ||
604 | (defun xscheme-yank (&optional arg) | |
605 | "Insert the most recent expression at point. | |
606 | With just C-U as argument, same but put point in front (and mark at end). | |
607 | With argument n, reinsert the nth most recently sent expression. | |
608 | See also the commands \\[xscheme-yank-pop] and \\[xscheme-yank-push]." | |
609 | (interactive "*P") | |
610 | (xscheme-rotate-yank-pointer (if (listp arg) 0 | |
611 | (if (eq arg '-) -1 | |
612 | (1- arg)))) | |
613 | (push-mark (point)) | |
614 | (insert (car xscheme-expressions-ring-yank-pointer)) | |
615 | (if (consp arg) | |
616 | (exchange-point-and-mark))) | |
617 | ||
618 | ;; Old name, to avoid errors in users' init files. | |
619 | (fset 'xscheme-yank-previous-send | |
620 | 'xscheme-yank) | |
621 | ||
622 | (defun xscheme-yank-pop (arg) | |
623 | "Insert or replace a just-yanked expression with an older expression. | |
624 | If the previous command was not a yank, it yanks. | |
625 | Otherwise, the region contains a stretch of reinserted | |
626 | expression. yank-pop deletes that text and inserts in its | |
627 | place a different expression. | |
628 | ||
629 | With no argument, the next older expression is inserted. | |
630 | With argument n, the n'th older expression is inserted. | |
631 | If n is negative, this is a more recent expression. | |
632 | ||
633 | The sequence of expressions wraps around, so that after the oldest one | |
634 | comes the newest one." | |
635 | (interactive "*p") | |
636 | (setq this-command 'xscheme-yank) | |
637 | (if (not (eq last-command 'xscheme-yank)) | |
638 | (progn | |
639 | (xscheme-yank) | |
640 | (setq arg (- arg 1)))) | |
641 | (if (not (= arg 0)) | |
642 | (let ((before (< (point) (mark)))) | |
643 | (delete-region (point) (mark)) | |
644 | (xscheme-rotate-yank-pointer arg) | |
645 | (set-mark (point)) | |
646 | (insert (car xscheme-expressions-ring-yank-pointer)) | |
647 | (if before (exchange-point-and-mark))))) | |
648 | ||
649 | (defun xscheme-yank-push (arg) | |
650 | "Insert or replace a just-yanked expression with a more recent expression. | |
651 | If the previous command was not a yank, it yanks. | |
652 | Otherwise, the region contains a stretch of reinserted | |
653 | expression. yank-pop deletes that text and inserts in its | |
654 | place a different expression. | |
655 | ||
656 | With no argument, the next more recent expression is inserted. | |
657 | With argument n, the n'th more recent expression is inserted. | |
658 | If n is negative, a less recent expression is used. | |
659 | ||
660 | The sequence of expressions wraps around, so that after the oldest one | |
661 | comes the newest one." | |
662 | (interactive "*p") | |
663 | (xscheme-yank-pop (- 0 arg))) | |
664 | \f | |
665 | (defun xscheme-send-region (start end) | |
666 | "Send the current region to the Scheme process. | |
667 | The region is sent terminated by a newline." | |
668 | (interactive "r") | |
669 | (if (xscheme-process-buffer-current-p) | |
670 | (progn | |
671 | (goto-char end) | |
672 | (if (not (bolp)) | |
673 | (insert-before-markers ?\n)) | |
674 | (set-marker (process-mark (get-process xscheme-process-name)) | |
675 | (point)) | |
676 | (set-marker xscheme-last-input-end (point)))) | |
677 | (xscheme-send-string (buffer-substring start end))) | |
678 | ||
679 | (defun xscheme-send-definition () | |
680 | "Send the current definition to the Scheme process. | |
681 | If the current line begins with a non-whitespace character, | |
682 | parse an expression from the beginning of the line and send that instead." | |
683 | (interactive) | |
684 | (let ((start nil) (end nil)) | |
685 | (save-excursion | |
686 | (end-of-defun) | |
687 | (setq end (point)) | |
688 | (if (re-search-backward "^\\s(" nil t) | |
689 | (setq start (point)) | |
690 | (error "Can't find definition"))) | |
691 | (xscheme-send-region start end))) | |
692 | ||
693 | (defun xscheme-send-next-expression () | |
694 | "Send the expression to the right of `point' to the Scheme process." | |
695 | (interactive) | |
696 | (let ((start (point))) | |
697 | (xscheme-send-region start (save-excursion (forward-sexp) (point))))) | |
698 | ||
699 | (defun xscheme-send-previous-expression () | |
700 | "Send the expression to the left of `point' to the Scheme process." | |
701 | (interactive) | |
702 | (let ((end (point))) | |
703 | (xscheme-send-region (save-excursion (backward-sexp) (point)) end))) | |
704 | \f | |
705 | (defun xscheme-send-current-line () | |
706 | "Send the current line to the Scheme process. | |
707 | Useful for working with debugging Scheme under adb." | |
708 | (interactive) | |
709 | (let ((line | |
710 | (save-excursion | |
711 | (beginning-of-line) | |
712 | (let ((start (point))) | |
713 | (end-of-line) | |
714 | (buffer-substring start (point)))))) | |
715 | (end-of-line) | |
716 | (insert ?\n) | |
717 | (xscheme-send-string-2 line))) | |
718 | ||
719 | (defun xscheme-send-buffer () | |
720 | "Send the current buffer to the Scheme process." | |
721 | (interactive) | |
722 | (if (xscheme-process-buffer-current-p) | |
723 | (error "Not allowed to send this buffer's contents to Scheme")) | |
724 | (xscheme-send-region (point-min) (point-max))) | |
725 | ||
726 | (defun xscheme-send-char (char) | |
727 | "Prompt for a character and send it to the Scheme process." | |
728 | (interactive "cCharacter to send: ") | |
729 | (process-send-string xscheme-process-name (char-to-string char))) | |
730 | ||
731 | (defun xscheme-delete-output () | |
732 | "Delete all output from interpreter since last input." | |
733 | (interactive) | |
734 | (let ((proc (get-buffer-process (current-buffer)))) | |
735 | (save-excursion | |
736 | (goto-char (process-mark proc)) | |
737 | (re-search-backward | |
738 | "^;\\(Unspecified return value$\\|Value\\( [0-9]+\\)?: \\|\\(Abort\\|Up\\|Quit\\)!$\\)" | |
739 | xscheme-last-input-end | |
740 | t) | |
741 | (forward-line 0) | |
742 | (if (< (marker-position xscheme-last-input-end) (point)) | |
743 | (progn | |
744 | (delete-region xscheme-last-input-end (point)) | |
745 | (insert-before-markers "*** output flushed ***\n")))))) | |
746 | \f | |
747 | ;;;; Interrupts | |
748 | ||
749 | (defun xscheme-send-breakpoint-interrupt () | |
750 | "Cause the Scheme process to enter a breakpoint." | |
751 | (interactive) | |
752 | (xscheme-send-interrupt ?b nil)) | |
753 | ||
754 | (defun xscheme-send-proceed () | |
755 | "Cause the Scheme process to proceed from a breakpoint." | |
756 | (interactive) | |
757 | (process-send-string xscheme-process-name "(proceed)\n")) | |
758 | ||
f28d4b0f JB |
759 | (defconst xscheme-control-g-message-string |
760 | "Sending C-G interrupt to Scheme...") | |
761 | ||
c5c3d778 DL |
762 | (defun xscheme-send-control-g-interrupt () |
763 | "Cause the Scheme processor to halt and flush input. | |
764 | Control returns to the top level rep loop." | |
765 | (interactive) | |
766 | (let ((inhibit-quit t)) | |
767 | (cond ((not xscheme-control-g-synchronization-p) | |
768 | (interrupt-process xscheme-process-name)) | |
769 | ((save-excursion | |
770 | (set-buffer xscheme-buffer-name) | |
771 | xscheme-control-g-disabled-p) | |
772 | (message "Relax...")) | |
773 | (t | |
774 | (save-excursion | |
775 | (set-buffer xscheme-buffer-name) | |
776 | (setq xscheme-control-g-disabled-p t)) | |
777 | (message xscheme-control-g-message-string) | |
778 | (interrupt-process xscheme-process-name) | |
779 | (sleep-for 0.1) | |
780 | (xscheme-send-char 0))))) | |
781 | ||
c5c3d778 DL |
782 | (defun xscheme-send-control-u-interrupt () |
783 | "Cause the Scheme process to halt, returning to previous rep loop." | |
784 | (interactive) | |
785 | (xscheme-send-interrupt ?u t)) | |
786 | ||
787 | (defun xscheme-send-control-x-interrupt () | |
788 | "Cause the Scheme process to halt, returning to current rep loop." | |
789 | (interactive) | |
790 | (xscheme-send-interrupt ?x t)) | |
791 | ||
792 | ;;; This doesn't really work right -- Scheme just gobbles the first | |
793 | ;;; character in the input. There is no way for us to guarantee that | |
794 | ;;; the argument to this procedure is the first char unless we put | |
795 | ;;; some kind of marker in the input stream. | |
796 | ||
797 | (defun xscheme-send-interrupt (char mark-p) | |
798 | "Send a ^A type interrupt to the Scheme process." | |
799 | (interactive "cInterrupt character to send: ") | |
800 | (quit-process xscheme-process-name) | |
801 | (sleep-for 0.1) | |
802 | (xscheme-send-char char) | |
803 | (if (and mark-p xscheme-control-g-synchronization-p) | |
804 | (xscheme-send-char 0))) | |
805 | \f | |
c5c3d778 DL |
806 | ;;;; Basic Process Control |
807 | ||
808 | (defun xscheme-start-process (command-line the-process the-buffer) | |
809 | (let ((buffer (get-buffer-create the-buffer))) | |
810 | (let ((process (get-buffer-process buffer))) | |
811 | (save-excursion | |
812 | (set-buffer buffer) | |
813 | (if (and process (memq (process-status process) '(run stop))) | |
814 | (set-marker (process-mark process) (point-max)) | |
815 | (progn (if process (delete-process process)) | |
816 | (goto-char (point-max)) | |
817 | (scheme-interaction-mode nil) | |
818 | (setq xscheme-process-name the-process) | |
819 | (if (bobp) | |
820 | (insert-before-markers | |
821 | (substitute-command-keys xscheme-startup-message))) | |
822 | (setq process | |
823 | (let ((process-connection-type nil)) | |
824 | (apply 'start-process | |
825 | (cons the-process | |
826 | (cons buffer | |
827 | (xscheme-parse-command-line | |
828 | command-line)))))) | |
829 | (if (not (equal (process-name process) the-process)) | |
830 | (setq xscheme-process-name (process-name process))) | |
831 | (if (not (equal (buffer-name buffer) the-buffer)) | |
832 | (setq xscheme-buffer-name (buffer-name buffer))) | |
833 | (message "Starting process %s in buffer %s" | |
834 | xscheme-process-name | |
835 | xscheme-buffer-name) | |
836 | (set-marker (process-mark process) (point-max)) | |
837 | (xscheme-process-filter-initialize t) | |
838 | (xscheme-modeline-initialize xscheme-buffer-name) | |
839 | (set-process-sentinel process 'xscheme-process-sentinel) | |
840 | (set-process-filter process 'xscheme-process-filter) | |
841 | (run-hooks 'xscheme-start-hook))))) | |
842 | buffer)) | |
843 | ||
844 | (defun xscheme-parse-command-line (string) | |
845 | (setq string (substitute-in-file-name string)) | |
846 | (let ((start 0) | |
847 | (result '())) | |
848 | (while start | |
849 | (let ((index (string-match "[ \t]" string start))) | |
850 | (setq start | |
851 | (cond ((not index) | |
852 | (setq result | |
853 | (cons (substring string start) | |
854 | result)) | |
855 | nil) | |
856 | ((= index start) | |
857 | (string-match "[^ \t]" string start)) | |
858 | (t | |
859 | (setq result | |
860 | (cons (substring string start index) | |
861 | result)) | |
862 | (1+ index)))))) | |
863 | (nreverse result))) | |
864 | \f | |
865 | (defun xscheme-wait-for-process () | |
866 | (sleep-for 2) | |
867 | (while xscheme-running-p | |
868 | (sleep-for 1))) | |
869 | ||
870 | (defun xscheme-process-running-p () | |
e7f767c2 | 871 | "True if there is a Scheme process whose status is `run'." |
c5c3d778 DL |
872 | (let ((process (get-process xscheme-process-name))) |
873 | (and process | |
874 | (eq (process-status process) 'run)))) | |
875 | ||
876 | (defun xscheme-process-buffer () | |
877 | (let ((process (get-process xscheme-process-name))) | |
878 | (and process (process-buffer process)))) | |
879 | ||
880 | (defun xscheme-process-buffer-window () | |
881 | (let ((buffer (xscheme-process-buffer))) | |
882 | (and buffer (get-buffer-window buffer)))) | |
883 | ||
884 | (defun xscheme-process-buffer-current-p () | |
e7f767c2 | 885 | "True if the current buffer is the Scheme process buffer." |
c5c3d778 DL |
886 | (eq (xscheme-process-buffer) (current-buffer))) |
887 | \f | |
f28d4b0f JB |
888 | ;;;; Process Filter Operations |
889 | ||
890 | (defvar xscheme-process-filter-alist | |
891 | '((?A xscheme-eval | |
892 | xscheme-process-filter:string-action-noexcursion) | |
893 | (?D xscheme-enter-debugger-mode | |
894 | xscheme-process-filter:string-action) | |
895 | (?E xscheme-eval | |
896 | xscheme-process-filter:string-action) | |
897 | (?P xscheme-set-prompt-variable | |
898 | xscheme-process-filter:string-action) | |
899 | (?R xscheme-enter-interaction-mode | |
900 | xscheme-process-filter:simple-action) | |
901 | (?b xscheme-start-gc | |
902 | xscheme-process-filter:simple-action) | |
903 | (?c xscheme-unsolicited-read-char | |
904 | xscheme-process-filter:simple-action) | |
905 | (?e xscheme-finish-gc | |
906 | xscheme-process-filter:simple-action) | |
907 | (?f xscheme-exit-input-wait | |
908 | xscheme-process-filter:simple-action) | |
909 | (?g xscheme-enable-control-g | |
910 | xscheme-process-filter:simple-action) | |
911 | (?i xscheme-prompt-for-expression | |
912 | xscheme-process-filter:string-action) | |
913 | (?m xscheme-message | |
914 | xscheme-process-filter:string-action) | |
915 | (?n xscheme-prompt-for-confirmation | |
916 | xscheme-process-filter:string-action) | |
917 | (?o xscheme-output-goto | |
918 | xscheme-process-filter:simple-action) | |
919 | (?p xscheme-set-prompt | |
920 | xscheme-process-filter:string-action) | |
921 | (?s xscheme-enter-input-wait | |
922 | xscheme-process-filter:simple-action) | |
923 | (?v xscheme-write-value | |
924 | xscheme-process-filter:string-action) | |
925 | (?w xscheme-cd | |
926 | xscheme-process-filter:string-action) | |
927 | (?z xscheme-display-process-buffer | |
928 | xscheme-process-filter:simple-action)) | |
929 | "Table used to decide how to handle process filter commands. | |
930 | Value is a list of entries, each entry is a list of three items. | |
931 | ||
932 | The first item is the character that the process filter dispatches on. | |
933 | The second item is the action to be taken, a function. | |
934 | The third item is the handler for the entry, a function. | |
935 | ||
936 | When the process filter sees a command whose character matches a | |
937 | particular entry, it calls the handler with two arguments: the action | |
938 | and the string containing the rest of the process filter's input | |
939 | stream. It is the responsibility of the handler to invoke the action | |
940 | with the appropriate arguments, and to reenter the process filter with | |
941 | the remaining input.") | |
942 | \f | |
c5c3d778 DL |
943 | ;;;; Process Filter |
944 | ||
945 | (defun xscheme-process-sentinel (proc reason) | |
946 | (let* ((buffer (process-buffer proc)) | |
947 | (name (buffer-name buffer))) | |
948 | (save-excursion | |
949 | (set-buffer buffer) | |
950 | (xscheme-process-filter-initialize (eq reason 'run)) | |
951 | (if (not (eq reason 'run)) | |
952 | (progn | |
953 | (setq scheme-mode-line-process "") | |
954 | (setq xscheme-mode-string "no process") | |
955 | (if (equal name (default-value 'xscheme-buffer-name)) | |
956 | (setq-default xscheme-runlight "")))) | |
957 | (if (and (not (memq reason '(run stop))) | |
958 | xscheme-signal-death-message) | |
959 | (progn | |
960 | (beep) | |
961 | (message | |
962 | "The Scheme process has died! Do M-x reset-scheme to restart it")))))) | |
963 | ||
964 | (defun xscheme-process-filter-initialize (running-p) | |
965 | (setq xscheme-process-filter-state 'idle) | |
966 | (setq xscheme-running-p running-p) | |
967 | (setq xscheme-control-g-disabled-p nil) | |
968 | (setq xscheme-allow-output-p t) | |
969 | (setq xscheme-prompt "") | |
970 | (if running-p | |
971 | (let ((name (buffer-name (current-buffer)))) | |
972 | (setq scheme-mode-line-process '(": " xscheme-runlight-string)) | |
973 | (xscheme-modeline-initialize name) | |
974 | (if (equal name (default-value 'xscheme-buffer-name)) | |
975 | (setq-default xscheme-runlight default-xscheme-runlight)))) | |
976 | (if (or (eq xscheme-runlight default-xscheme-runlight) | |
977 | (equal xscheme-runlight "")) | |
978 | (setq xscheme-runlight (list ": " 'xscheme-buffer-name ": " "?"))) | |
979 | (rplaca (nthcdr 3 xscheme-runlight) | |
980 | (if running-p "?" "no process"))) | |
981 | ||
982 | (defun xscheme-process-filter (proc string) | |
983 | (let ((xscheme-filter-input string) | |
984 | (call-noexcursion nil)) | |
985 | (while xscheme-filter-input | |
986 | (setq call-noexcursion nil) | |
987 | (save-excursion | |
988 | (set-buffer (process-buffer proc)) | |
989 | (cond ((eq xscheme-process-filter-state 'idle) | |
990 | (let ((start (string-match "\e" xscheme-filter-input))) | |
991 | (if start | |
992 | (progn | |
993 | (xscheme-process-filter-output | |
994 | (substring xscheme-filter-input 0 start)) | |
995 | (setq xscheme-filter-input | |
996 | (substring xscheme-filter-input (1+ start))) | |
997 | (setq xscheme-process-filter-state 'reading-type)) | |
998 | (let ((string xscheme-filter-input)) | |
999 | (setq xscheme-filter-input nil) | |
1000 | (xscheme-process-filter-output string))))) | |
1001 | ((eq xscheme-process-filter-state 'reading-type) | |
1002 | (if (zerop (length xscheme-filter-input)) | |
1003 | (setq xscheme-filter-input nil) | |
1004 | (let ((char (aref xscheme-filter-input 0))) | |
1005 | (setq xscheme-filter-input | |
1006 | (substring xscheme-filter-input 1)) | |
1007 | (let ((entry (assoc char xscheme-process-filter-alist))) | |
1008 | (if entry | |
1009 | (funcall (nth 2 entry) (nth 1 entry)) | |
1010 | (progn | |
1011 | (xscheme-process-filter-output ?\e char) | |
1012 | (setq xscheme-process-filter-state 'idle))))))) | |
1013 | ((eq xscheme-process-filter-state 'reading-string) | |
1014 | (let ((start (string-match "\e" xscheme-filter-input))) | |
1015 | (if start | |
1016 | (let ((string | |
1017 | (concat xscheme-string-accumulator | |
1018 | (substring xscheme-filter-input 0 start)))) | |
1019 | (setq xscheme-filter-input | |
1020 | (substring xscheme-filter-input (1+ start))) | |
1021 | (setq xscheme-process-filter-state 'idle) | |
1022 | (if (listp xscheme-string-receiver) | |
1023 | (progn | |
1024 | (setq xscheme-string-receiver | |
1025 | (car xscheme-string-receiver)) | |
1026 | (setq call-noexcursion string)) | |
1027 | (funcall xscheme-string-receiver string))) | |
1028 | (progn | |
1029 | (setq xscheme-string-accumulator | |
1030 | (concat xscheme-string-accumulator | |
1031 | xscheme-filter-input)) | |
1032 | (setq xscheme-filter-input nil))))) | |
1033 | (t | |
1034 | (error "Scheme process filter -- bad state")))) | |
1035 | (if call-noexcursion | |
1036 | (funcall xscheme-string-receiver call-noexcursion))))) | |
1037 | \f | |
1038 | ;;;; Process Filter Output | |
1039 | ||
1040 | (defun xscheme-process-filter-output (&rest args) | |
1041 | (if xscheme-allow-output-p | |
1042 | (let ((string (apply 'concat args))) | |
1043 | (save-excursion | |
1044 | (xscheme-goto-output-point) | |
1045 | (let ((old-point (point))) | |
1046 | (while (string-match "\\(\007\\|\f\\)" string) | |
1047 | (let ((start (match-beginning 0)) | |
1048 | (end (match-end 0))) | |
1049 | (insert-before-markers (substring string 0 start)) | |
1050 | (if (= ?\f (aref string start)) | |
1051 | (progn | |
1052 | (if (not (bolp)) | |
1053 | (insert-before-markers ?\n)) | |
1054 | (insert-before-markers ?\f)) | |
1055 | (beep)) | |
1056 | (setq string (substring string (1+ start))))) | |
1057 | (insert-before-markers string) | |
1058 | (if (and xscheme-last-input-end | |
1059 | (equal (marker-position xscheme-last-input-end) (point))) | |
1060 | (set-marker xscheme-last-input-end old-point))))))) | |
1061 | ||
1062 | (defun xscheme-guarantee-newlines (n) | |
1063 | (if xscheme-allow-output-p | |
1064 | (save-excursion | |
1065 | (xscheme-goto-output-point) | |
1066 | (let ((stop nil)) | |
1067 | (while (and (not stop) | |
1068 | (bolp)) | |
1069 | (setq n (1- n)) | |
1070 | (if (bobp) | |
1071 | (setq stop t) | |
1072 | (backward-char)))) | |
1073 | (xscheme-goto-output-point) | |
1074 | (while (> n 0) | |
1075 | (insert-before-markers ?\n) | |
1076 | (setq n (1- n)))))) | |
1077 | ||
1078 | (defun xscheme-goto-output-point () | |
1079 | (let ((process (get-process xscheme-process-name))) | |
1080 | (set-buffer (process-buffer process)) | |
1081 | (goto-char (process-mark process)))) | |
1082 | ||
1083 | (defun xscheme-modeline-initialize (name) | |
1084 | (setq xscheme-runlight-string "") | |
1085 | (if (equal name (default-value 'xscheme-buffer-name)) | |
1086 | (setq-default xscheme-runlight-string "")) | |
1087 | (setq xscheme-mode-string "") | |
1088 | (setq mode-line-buffer-identification | |
1089 | (list (concat name ": ") | |
1090 | 'xscheme-mode-string))) | |
1091 | ||
1092 | (defun xscheme-set-runlight (runlight) | |
1093 | (setq xscheme-runlight-string runlight) | |
1094 | (if (equal (buffer-name (current-buffer)) | |
1095 | (default-value 'xscheme-buffer-name)) | |
1096 | (setq-default xscheme-runlight-string runlight)) | |
1097 | (rplaca (nthcdr 3 xscheme-runlight) runlight) | |
1098 | (force-mode-line-update t)) | |
1099 | \f | |
c5c3d778 DL |
1100 | (defun xscheme-process-filter:simple-action (action) |
1101 | (setq xscheme-process-filter-state 'idle) | |
1102 | (funcall action)) | |
1103 | ||
1104 | (defun xscheme-process-filter:string-action (action) | |
1105 | (setq xscheme-string-receiver action) | |
1106 | (setq xscheme-string-accumulator "") | |
1107 | (setq xscheme-process-filter-state 'reading-string)) | |
1108 | ||
1109 | (defun xscheme-process-filter:string-action-noexcursion (action) | |
1110 | (xscheme-process-filter:string-action (cons action nil))) | |
1111 | ||
1112 | (defconst xscheme-runlight:running "run" | |
1113 | "The character displayed when the Scheme process is running.") | |
1114 | ||
1115 | (defconst xscheme-runlight:input "input" | |
1116 | "The character displayed when the Scheme process is waiting for input.") | |
1117 | ||
1118 | (defconst xscheme-runlight:gc "gc" | |
1119 | "The character displayed when the Scheme process is garbage collecting.") | |
1120 | ||
1121 | (defun xscheme-start-gc () | |
1122 | (xscheme-set-runlight xscheme-runlight:gc)) | |
1123 | ||
1124 | (defun xscheme-finish-gc () | |
1125 | (xscheme-set-runlight | |
1126 | (if xscheme-running-p xscheme-runlight:running xscheme-runlight:input))) | |
1127 | ||
1128 | (defun xscheme-enter-input-wait () | |
1129 | (xscheme-set-runlight xscheme-runlight:input) | |
1130 | (setq xscheme-control-g-disabled-p nil) | |
1131 | (setq xscheme-running-p nil)) | |
1132 | ||
1133 | (defun xscheme-exit-input-wait () | |
1134 | (xscheme-set-runlight xscheme-runlight:running) | |
1135 | (setq xscheme-running-p t)) | |
1136 | ||
1137 | (defun xscheme-enable-control-g () | |
1138 | (setq xscheme-control-g-disabled-p nil) | |
1139 | (if (string= (current-message) xscheme-control-g-message-string) | |
1140 | (message nil))) | |
1141 | ||
1142 | (defun xscheme-display-process-buffer () | |
1143 | (let ((window (or (xscheme-process-buffer-window) | |
1144 | (display-buffer (xscheme-process-buffer))))) | |
1145 | (save-window-excursion | |
1146 | (select-window window) | |
1147 | (xscheme-goto-output-point) | |
1148 | (if (xscheme-debugger-mode-p) | |
1149 | (xscheme-enter-interaction-mode))))) | |
1150 | ||
1151 | (defun xscheme-unsolicited-read-char () | |
1152 | nil) | |
1153 | \f | |
1154 | (defun xscheme-eval (string) | |
1155 | (eval (car (read-from-string string)))) | |
1156 | ||
1157 | (defun xscheme-message (string) | |
1158 | (if (not (zerop (length string))) | |
1159 | (xscheme-write-message-1 string (format ";%s" string)))) | |
1160 | ||
1161 | (defun xscheme-write-value (string) | |
1162 | (if (zerop (length string)) | |
1163 | (xscheme-write-message-1 "(no value)" ";Unspecified return value") | |
1164 | (xscheme-write-message-1 string (format ";Value: %s" string)))) | |
1165 | ||
1166 | (defun xscheme-write-message-1 (message-string output-string) | |
1167 | (let* ((process (get-process xscheme-process-name)) | |
1168 | (window (get-buffer-window (process-buffer process)))) | |
1169 | (if (or (not window) | |
1170 | (not (pos-visible-in-window-p (process-mark process) | |
1171 | window))) | |
1172 | (message "%s" message-string))) | |
1173 | (xscheme-guarantee-newlines 1) | |
1174 | (xscheme-process-filter-output output-string)) | |
1175 | ||
1176 | (defun xscheme-set-prompt-variable (string) | |
1177 | (setq xscheme-prompt string)) | |
1178 | ||
1179 | (defun xscheme-set-prompt (string) | |
1180 | (setq xscheme-prompt string) | |
1181 | (xscheme-guarantee-newlines 2) | |
1182 | (setq xscheme-mode-string (xscheme-coerce-prompt string)) | |
1183 | (force-mode-line-update t)) | |
1184 | ||
1185 | (defun xscheme-output-goto () | |
1186 | (xscheme-goto-output-point) | |
1187 | (xscheme-guarantee-newlines 2)) | |
1188 | ||
1189 | (defun xscheme-coerce-prompt (string) | |
1190 | (if (string-match "^[0-9]+ \\[[^]]+\\] " string) | |
1191 | (let ((end (match-end 0))) | |
1192 | (xscheme-process-filter-output (substring string end)) | |
1193 | (substring string 0 (- end 1))) | |
1194 | string)) | |
1195 | ||
1196 | (defun xscheme-cd (directory-string) | |
1197 | (save-excursion | |
1198 | (set-buffer (xscheme-process-buffer)) | |
1199 | (cd directory-string))) | |
1200 | \f | |
1201 | (defun xscheme-prompt-for-confirmation (prompt-string) | |
1202 | (xscheme-send-char (if (y-or-n-p prompt-string) ?y ?n))) | |
1203 | ||
c5c3d778 DL |
1204 | (defvar xscheme-prompt-for-expression-map nil) |
1205 | (if (not xscheme-prompt-for-expression-map) | |
1206 | (progn | |
1207 | (setq xscheme-prompt-for-expression-map | |
1208 | (copy-keymap minibuffer-local-map)) | |
1209 | (substitute-key-definition 'exit-minibuffer | |
1210 | 'xscheme-prompt-for-expression-exit | |
1211 | xscheme-prompt-for-expression-map))) | |
1212 | ||
f28d4b0f JB |
1213 | (defun xscheme-prompt-for-expression (prompt-string) |
1214 | (xscheme-send-string-2 | |
1215 | (read-from-minibuffer prompt-string nil xscheme-prompt-for-expression-map))) | |
1216 | ||
c5c3d778 DL |
1217 | (defun xscheme-prompt-for-expression-exit () |
1218 | (interactive) | |
1219 | (if (eq (xscheme-region-expression-p (point-min) (point-max)) 'one) | |
1220 | (exit-minibuffer) | |
1221 | (error "input must be a single, complete expression"))) | |
1222 | ||
1223 | (defun xscheme-region-expression-p (start end) | |
1224 | (save-excursion | |
1225 | (let ((old-syntax-table (syntax-table))) | |
1226 | (unwind-protect | |
1227 | (progn | |
1228 | (set-syntax-table scheme-mode-syntax-table) | |
1229 | (let ((state (parse-partial-sexp start end))) | |
1230 | (and (zerop (car state)) ;depth = 0 | |
1231 | (nth 2 state) ;last-sexp exists, i.e. >= 1 sexps | |
1232 | (let ((state (parse-partial-sexp start (nth 2 state)))) | |
1233 | (if (nth 2 state) 'many 'one))))) | |
1234 | (set-syntax-table old-syntax-table))))) | |
1235 | ||
1236 | (provide 'xscheme) | |
1237 | ||
cbee283d | 1238 | ;; arch-tag: cfc14adc-2917-409e-ad16-432e8d0017de |
c5c3d778 | 1239 | ;;; xscheme.el ends here |