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[emacs.git] / lisp / cmuscheme.el
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1 ;;; cmuscheme.el --- Scheme process in a buffer. Adapted from tea.el
3 ;; Copyright (C) 1988, 1994, 1997, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007 Free Software Foundation, Inc.
6 ;; Author: Olin Shivers <olin.shivers@cs.cmu.edu>
7 ;; Maintainer: FSF
8 ;; Keywords: processes, lisp
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software; you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 ;; Boston, MA 02110-1301, USA.
27 ;;; Commentary:
29 ;; This is a customization of comint-mode (see comint.el)
31 ;; Written by Olin Shivers (olin.shivers@cs.cmu.edu). With bits and pieces
32 ;; lifted from scheme.el, shell.el, clisp.el, newclisp.el, cobol.el, et al..
33 ;; 8/88
35 ;; Please send me bug reports, bug fixes, and extensions, so that I can
36 ;; merge them into the master source.
38 ;; The changelog is at the end of this file.
40 ;; NOTE: MIT Cscheme, when invoked with the -emacs flag, has a special user
41 ;; interface that communicates process state back to the superior emacs by
42 ;; outputting special control sequences. The gnumacs package, xscheme.el, has
43 ;; lots and lots of special purpose code to read these control sequences, and
44 ;; so is very tightly integrated with the cscheme process. The cscheme
45 ;; interrupt handler and debugger read single character commands in cbreak
46 ;; mode; when this happens, xscheme.el switches to special keymaps that bind
47 ;; the single letter command keys to emacs functions that directly send the
48 ;; character to the scheme process. Cmuscheme mode does *not* provide this
49 ;; functionality. If you are a cscheme user, you may prefer to use the
50 ;; xscheme.el/cscheme -emacs interaction.
52 ;; Here's a summary of the pros and cons, as I see them.
53 ;; xscheme: Tightly integrated with inferior cscheme process! A few commands
54 ;; not in cmuscheme. But. Integration is a bit of a hack. Input
55 ;; history only keeps the immediately prior input. Bizarre
56 ;; keybindings.
58 ;; cmuscheme: Not tightly integrated with inferior cscheme process. But.
59 ;; Carefully integrated functionality with the entire suite of
60 ;; comint-derived CMU process modes. Keybindings reminiscent of
61 ;; Zwei and Hemlock. Good input history. A few commands not in
62 ;; xscheme.
64 ;; It's a tradeoff. Pay your money; take your choice. If you use a Scheme
65 ;; that isn't Cscheme, of course, there isn't a choice. Xscheme.el is *very*
66 ;; Cscheme-specific; you must use cmuscheme.el. Interested parties are
67 ;; invited to port xscheme functionality on top of comint mode...
69 ;;; CHANGE LOG
70 ;;; ===========================================================================
71 ;;; 8/88 Olin
72 ;;; Created.
73 ;;;
74 ;;; 2/15/89 Olin
75 ;;; Removed -emacs flag from process invocation. It's only useful for
76 ;;; cscheme, and makes cscheme assume it's running under xscheme.el,
77 ;;; which messes things up royally. A bug.
78 ;;;
79 ;;; 5/22/90 Olin
80 ;;; - Upgraded to use comint-send-string and comint-send-region.
81 ;;; - run-scheme now offers to let you edit the command line if
82 ;;; you invoke it with a prefix-arg. M-x scheme is redundant, and
83 ;;; has been removed.
84 ;;; - Explicit references to process "scheme" have been replaced with
85 ;;; (scheme-proc). This allows better handling of multiple process bufs.
86 ;;; - Added scheme-send-last-sexp, bound to C-x C-e. A gnu convention.
87 ;;; - Have not added process query facility a la cmulisp.el's lisp-show-arglist
88 ;;; and friends, but interested hackers might find a useful application
89 ;;; of this facility.
90 ;;;
91 ;;; 3/12/90 Olin
92 ;;; - scheme-load-file and scheme-compile-file no longer switch-to-scheme.
93 ;;; Tale suggested this.
95 ;;; Code:
97 (require 'scheme)
98 (require 'comint)
101 (defgroup cmuscheme nil
102 "Run a scheme process in a buffer."
103 :group 'scheme)
105 ;;; INFERIOR SCHEME MODE STUFF
106 ;;;============================================================================
108 (defcustom inferior-scheme-mode-hook nil
109 "*Hook for customizing inferior-scheme mode."
110 :type 'hook
111 :group 'cmuscheme)
113 (defvar inferior-scheme-mode-map
114 (let ((m (make-sparse-keymap)))
115 (define-key m "\M-\C-x" 'scheme-send-definition) ;gnu convention
116 (define-key m "\C-x\C-e" 'scheme-send-last-sexp)
117 (define-key m "\C-c\C-l" 'scheme-load-file)
118 (define-key m "\C-c\C-k" 'scheme-compile-file)
119 (scheme-mode-commands m)
122 ;; Install the process communication commands in the scheme-mode keymap.
123 (define-key scheme-mode-map "\M-\C-x" 'scheme-send-definition);gnu convention
124 (define-key scheme-mode-map "\C-x\C-e" 'scheme-send-last-sexp);gnu convention
125 (define-key scheme-mode-map "\C-c\C-e" 'scheme-send-definition)
126 (define-key scheme-mode-map "\C-c\M-e" 'scheme-send-definition-and-go)
127 (define-key scheme-mode-map "\C-c\C-r" 'scheme-send-region)
128 (define-key scheme-mode-map "\C-c\M-r" 'scheme-send-region-and-go)
129 (define-key scheme-mode-map "\C-c\M-c" 'scheme-compile-definition)
130 (define-key scheme-mode-map "\C-c\C-c" 'scheme-compile-definition-and-go)
131 (define-key scheme-mode-map "\C-c\C-t" 'scheme-trace-procedure)
132 (define-key scheme-mode-map "\C-c\C-x" 'scheme-expand-current-form)
133 (define-key scheme-mode-map "\C-c\C-z" 'switch-to-scheme)
134 (define-key scheme-mode-map "\C-c\C-l" 'scheme-load-file)
135 (define-key scheme-mode-map "\C-c\C-k" 'scheme-compile-file) ;k for "kompile"
137 (let ((map (lookup-key scheme-mode-map [menu-bar scheme])))
138 (define-key map [separator-eval] '("--"))
139 (define-key map [compile-file]
140 '("Compile Scheme File" . scheme-compile-file))
141 (define-key map [load-file]
142 '("Load Scheme File" . scheme-load-file))
143 (define-key map [switch]
144 '("Switch to Scheme" . switch-to-scheme))
145 (define-key map [com-def-go]
146 '("Compile Definition & Go" . scheme-compile-definition-and-go))
147 (define-key map [com-def]
148 '("Compile Definition" . scheme-compile-definition))
149 (define-key map [exp-form]
150 '("Expand current form" . scheme-expand-current-form))
151 (define-key map [trace-proc]
152 '("Trace procedure" . scheme-trace-procedure))
153 (define-key map [send-def-go]
154 '("Evaluate Last Definition & Go" . scheme-send-definition-and-go))
155 (define-key map [send-def]
156 '("Evaluate Last Definition" . scheme-send-definition))
157 (define-key map [send-region-go]
158 '("Evaluate Region & Go" . scheme-send-region-and-go))
159 (define-key map [send-region]
160 '("Evaluate Region" . scheme-send-region))
161 (define-key map [send-sexp]
162 '("Evaluate Last S-expression" . scheme-send-last-sexp))
165 (defvar scheme-buffer)
167 (define-derived-mode inferior-scheme-mode comint-mode "Inferior Scheme"
168 "Major mode for interacting with an inferior Scheme process.
170 The following commands are available:
171 \\{inferior-scheme-mode-map}
173 A Scheme process can be fired up with M-x run-scheme.
175 Customization: Entry to this mode runs the hooks on comint-mode-hook and
176 inferior-scheme-mode-hook (in that order).
178 You can send text to the inferior Scheme process from other buffers containing
179 Scheme source.
180 switch-to-scheme switches the current buffer to the Scheme process buffer.
181 scheme-send-definition sends the current definition to the Scheme process.
182 scheme-compile-definition compiles the current definition.
183 scheme-send-region sends the current region to the Scheme process.
184 scheme-compile-region compiles the current region.
186 scheme-send-definition-and-go, scheme-compile-definition-and-go,
187 scheme-send-region-and-go, and scheme-compile-region-and-go
188 switch to the Scheme process buffer after sending their text.
189 For information on running multiple processes in multiple buffers, see
190 documentation for variable scheme-buffer.
192 Commands:
193 Return after the end of the process' output sends the text from the
194 end of process to point.
195 Return before the end of the process' output copies the sexp ending at point
196 to the end of the process' output, and sends it.
197 Delete converts tabs to spaces as it moves back.
198 Tab indents for Scheme; with argument, shifts rest
199 of expression rigidly with the current line.
200 C-M-q does Tab on each line starting within following expression.
201 Paragraphs are separated only by blank lines. Semicolons start comments.
202 If you accidentally suspend your process, use \\[comint-continue-subjob]
203 to continue it."
204 ;; Customize in inferior-scheme-mode-hook
205 (setq comint-prompt-regexp "^[^>\n]*>+ *") ; OK for cscheme, oaklisp, T,...
206 (scheme-mode-variables)
207 (setq mode-line-process '(":%s"))
208 (setq comint-input-filter (function scheme-input-filter))
209 (setq comint-get-old-input (function scheme-get-old-input)))
211 (defcustom inferior-scheme-filter-regexp "\\`\\s *\\S ?\\S ?\\s *\\'"
212 "*Input matching this regexp are not saved on the history list.
213 Defaults to a regexp ignoring all inputs of 0, 1, or 2 letters."
214 :type 'regexp
215 :group 'cmuscheme)
217 (defun scheme-input-filter (str)
218 "Don't save anything matching `inferior-scheme-filter-regexp'."
219 (not (string-match inferior-scheme-filter-regexp str)))
221 (defun scheme-get-old-input ()
222 "Snarf the sexp ending at point."
223 (save-excursion
224 (let ((end (point)))
225 (backward-sexp)
226 (buffer-substring (point) end))))
228 (defun scheme-args-to-list (string)
229 (let ((where (string-match "[ \t]" string)))
230 (cond ((null where) (list string))
231 ((not (= where 0))
232 (cons (substring string 0 where)
233 (scheme-args-to-list (substring string (+ 1 where)
234 (length string)))))
235 (t (let ((pos (string-match "[^ \t]" string)))
236 (if (null pos)
238 (scheme-args-to-list (substring string pos
239 (length string)))))))))
241 ;;;###autoload
242 (defun run-scheme (cmd)
243 "Run an inferior Scheme process, input and output via buffer `*scheme*'.
244 If there is a process already running in `*scheme*', switch to that buffer.
245 With argument, allows you to edit the command line (default is value
246 of `scheme-program-name').
247 If the file `~/.emacs_SCHEMENAME' or `~/.emacs.d/init_SCHEMENAME.scm' exists,
248 it is given as initial input.
249 Note that this may lose due to a timing error if the Scheme processor
250 discards input when it starts up.
251 Runs the hook `inferior-scheme-mode-hook' \(after the `comint-mode-hook'
252 is run).
253 \(Type \\[describe-mode] in the process buffer for a list of commands.)"
255 (interactive (list (if current-prefix-arg
256 (read-string "Run Scheme: " scheme-program-name)
257 scheme-program-name)))
258 (if (not (comint-check-proc "*scheme*"))
259 (let ((cmdlist (scheme-args-to-list cmd)))
260 (set-buffer (apply 'make-comint "scheme" (car cmdlist)
261 (scheme-start-file (car cmdlist)) (cdr cmdlist)))
262 (inferior-scheme-mode)))
263 (setq scheme-program-name cmd)
264 (setq scheme-buffer "*scheme*")
265 (pop-to-buffer "*scheme*"))
266 ;;;###autoload (add-hook 'same-window-buffer-names "*scheme*")
268 (defun scheme-start-file (prog)
269 "Return the name of the start file corresponding to PROG.
270 Search in the directories \"~\" and \"~/.emacs.d\", in this
271 order. Return nil if no start file found."
272 (let* ((progname (file-name-nondirectory prog))
273 (start-file (concat "~/.emacs_" progname))
274 (alt-start-file (concat "~/.emacs.d/init_" progname ".scm")))
275 (if (file-exists-p start-file)
276 start-file
277 (and (file-exists-p alt-start-file) alt-start-file))))
279 (defun scheme-send-region (start end)
280 "Send the current region to the inferior Scheme process."
281 (interactive "r")
282 (comint-send-region (scheme-proc) start end)
283 (comint-send-string (scheme-proc) "\n"))
285 (defun scheme-send-definition ()
286 "Send the current definition to the inferior Scheme process."
287 (interactive)
288 (save-excursion
289 (end-of-defun)
290 (let ((end (point)))
291 (beginning-of-defun)
292 (scheme-send-region (point) end))))
294 (defun scheme-send-last-sexp ()
295 "Send the previous sexp to the inferior Scheme process."
296 (interactive)
297 (scheme-send-region (save-excursion (backward-sexp) (point)) (point)))
299 (defcustom scheme-compile-exp-command "(compile '%s)"
300 "*Template for issuing commands to compile arbitrary Scheme expressions."
301 :type 'string
302 :group 'cmuscheme)
304 (defun scheme-compile-region (start end)
305 "Compile the current region in the inferior Scheme process.
306 \(A BEGIN is wrapped around the region: (BEGIN <region>))"
307 (interactive "r")
308 (comint-send-string (scheme-proc) (format scheme-compile-exp-command
309 (format "(begin %s)"
310 (buffer-substring start end))))
311 (comint-send-string (scheme-proc) "\n"))
313 (defun scheme-compile-definition ()
314 "Compile the current definition in the inferior Scheme process."
315 (interactive)
316 (save-excursion
317 (end-of-defun)
318 (let ((end (point)))
319 (beginning-of-defun)
320 (scheme-compile-region (point) end))))
322 (defcustom scheme-trace-command "(trace %s)"
323 "*Template for issuing commands to trace a Scheme procedure.
324 Some Scheme implementations might require more elaborate commands here.
325 For PLT-Scheme, e.g., one should use
327 (setq scheme-trace-command \"(begin (require (lib \\\"trace.ss\\\")) (trace %s))\")
329 For Scheme 48 and Scsh use \",trace %s\"."
330 :type 'string
331 :group 'cmuscheme)
333 (defcustom scheme-untrace-command "(untrace %s)"
334 "*Template for switching off tracing of a Scheme procedure.
335 Scheme 48 and Scsh users should set this variable to \",untrace %s\"."
337 :type 'string
338 :group 'cmuscheme)
340 (defun scheme-trace-procedure (proc &optional untrace)
341 "Trace procedure PROC in the inferior Scheme process.
342 With a prefix argument switch off tracing of procedure PROC."
343 (interactive
344 (list (let ((current (symbol-at-point))
345 (action (if current-prefix-arg "Untrace" "Trace")))
346 (if current
347 (read-string (format "%s procedure [%s]: " action current) nil nil (symbol-name current))
348 (read-string (format "%s procedure: " action))))
349 current-prefix-arg))
350 (when (= (length proc) 0)
351 (error "Invalid procedure name"))
352 (comint-send-string (scheme-proc)
353 (format
354 (if untrace scheme-untrace-command scheme-trace-command)
355 proc))
356 (comint-send-string (scheme-proc) "\n"))
358 (defcustom scheme-macro-expand-command "(expand %s)"
359 "*Template for macro-expanding a Scheme form.
360 For Scheme 48 and Scsh use \",expand %s\"."
361 :type 'string
362 :group 'cmuscheme)
364 (defun scheme-expand-current-form ()
365 "Macro-expand the form at point in the inferior Scheme process."
366 (interactive)
367 (let ((current-form (scheme-form-at-point)))
368 (if current-form
369 (progn
370 (comint-send-string (scheme-proc)
371 (format
372 scheme-macro-expand-command
373 current-form))
374 (comint-send-string (scheme-proc) "\n"))
375 (error "Not at a form"))))
377 (defun scheme-form-at-point ()
378 (let ((next-sexp (thing-at-point 'sexp)))
379 (if (and next-sexp (string-equal (substring next-sexp 0 1) "("))
380 next-sexp
381 (save-excursion
382 (backward-up-list)
383 (scheme-form-at-point)))))
385 (defun switch-to-scheme (eob-p)
386 "Switch to the scheme process buffer.
387 With argument, position cursor at end of buffer."
388 (interactive "P")
389 (if (or (and scheme-buffer (get-buffer scheme-buffer))
390 (scheme-interactively-start-process))
391 (pop-to-buffer scheme-buffer)
392 (error "No current process buffer. See variable `scheme-buffer'"))
393 (when eob-p
394 (push-mark)
395 (goto-char (point-max))))
397 (defun scheme-send-region-and-go (start end)
398 "Send the current region to the inferior Scheme process.
399 Then switch to the process buffer."
400 (interactive "r")
401 (scheme-send-region start end)
402 (switch-to-scheme t))
404 (defun scheme-send-definition-and-go ()
405 "Send the current definition to the inferior Scheme.
406 Then switch to the process buffer."
407 (interactive)
408 (scheme-send-definition)
409 (switch-to-scheme t))
411 (defun scheme-compile-definition-and-go ()
412 "Compile the current definition in the inferior Scheme.
413 Then switch to the process buffer."
414 (interactive)
415 (scheme-compile-definition)
416 (switch-to-scheme t))
418 (defun scheme-compile-region-and-go (start end)
419 "Compile the current region in the inferior Scheme.
420 Then switch to the process buffer."
421 (interactive "r")
422 (scheme-compile-region start end)
423 (switch-to-scheme t))
425 (defcustom scheme-source-modes '(scheme-mode)
426 "*Used to determine if a buffer contains Scheme source code.
427 If it's loaded into a buffer that is in one of these major modes, it's
428 considered a scheme source file by `scheme-load-file' and `scheme-compile-file'.
429 Used by these commands to determine defaults."
430 :type '(repeat function)
431 :group 'cmuscheme)
433 (defvar scheme-prev-l/c-dir/file nil
434 "Caches the last (directory . file) pair.
435 Caches the last pair used in the last `scheme-load-file' or
436 `scheme-compile-file' command. Used for determining the default
437 in the next one.")
439 (defun scheme-load-file (file-name)
440 "Load a Scheme file FILE-NAME into the inferior Scheme process."
441 (interactive (comint-get-source "Load Scheme file: " scheme-prev-l/c-dir/file
442 scheme-source-modes t)) ; t because `load'
443 ; needs an exact name
444 (comint-check-source file-name) ; Check to see if buffer needs saved.
445 (setq scheme-prev-l/c-dir/file (cons (file-name-directory file-name)
446 (file-name-nondirectory file-name)))
447 (comint-send-string (scheme-proc) (concat "(load \""
448 file-name
449 "\"\)\n")))
451 (defun scheme-compile-file (file-name)
452 "Compile a Scheme file FILE-NAME in the inferior Scheme process."
453 (interactive (comint-get-source "Compile Scheme file: "
454 scheme-prev-l/c-dir/file
455 scheme-source-modes
456 nil)) ; nil because COMPILE doesn't
457 ; need an exact name.
458 (comint-check-source file-name) ; Check to see if buffer needs saved.
459 (setq scheme-prev-l/c-dir/file (cons (file-name-directory file-name)
460 (file-name-nondirectory file-name)))
461 (comint-send-string (scheme-proc) (concat "(compile-file \""
462 file-name
463 "\"\)\n")))
466 (defvar scheme-buffer nil "*The current scheme process buffer.
468 MULTIPLE PROCESS SUPPORT
469 ===========================================================================
470 Cmuscheme.el supports, in a fairly simple fashion, running multiple Scheme
471 processes. To run multiple Scheme processes, you start the first up with
472 \\[run-scheme]. It will be in a buffer named *scheme*. Rename this buffer
473 with \\[rename-buffer]. You may now start up a new process with another
474 \\[run-scheme]. It will be in a new buffer, named *scheme*. You can
475 switch between the different process buffers with \\[switch-to-buffer].
477 Commands that send text from source buffers to Scheme processes --
478 like `scheme-send-definition' or `scheme-compile-region' -- have to choose a
479 process to send to, when you have more than one Scheme process around. This
480 is determined by the global variable `scheme-buffer'. Suppose you
481 have three inferior Schemes running:
482 Buffer Process
483 foo scheme
484 bar scheme<2>
485 *scheme* scheme<3>
486 If you do a \\[scheme-send-definition-and-go] command on some Scheme source
487 code, what process do you send it to?
489 - If you're in a process buffer (foo, bar, or *scheme*),
490 you send it to that process.
491 - If you're in some other buffer (e.g., a source file), you
492 send it to the process attached to buffer `scheme-buffer'.
493 This process selection is performed by function `scheme-proc'.
495 Whenever \\[run-scheme] fires up a new process, it resets `scheme-buffer'
496 to be the new process's buffer. If you only run one process, this will
497 do the right thing. If you run multiple processes, you can change
498 `scheme-buffer' to another process buffer with \\[set-variable].
500 More sophisticated approaches are, of course, possible. If you find yourself
501 needing to switch back and forth between multiple processes frequently,
502 you may wish to consider ilisp.el, a larger, more sophisticated package
503 for running inferior Lisp and Scheme processes. The approach taken here is
504 for a minimal, simple implementation. Feel free to extend it.")
506 (defun scheme-proc ()
507 "Return the current Scheme process, starting one if necessary.
508 See variable `scheme-buffer'."
509 (unless (and scheme-buffer
510 (get-buffer scheme-buffer)
511 (comint-check-proc scheme-buffer))
512 (scheme-interactively-start-process))
513 (or (scheme-get-process)
514 (error "No current process. See variable `scheme-buffer'")))
516 (defun scheme-get-process ()
517 "Return the current Scheme process or nil if none is running."
518 (get-buffer-process (if (eq major-mode 'inferior-scheme-mode)
519 (current-buffer)
520 scheme-buffer)))
522 (defun scheme-interactively-start-process (&optional cmd)
523 "Start an inferior Scheme process. Return the process started.
524 Since this command is run implicitly, always ask the user for the
525 command to run."
526 (save-window-excursion
527 (run-scheme (read-string "Run Scheme: " scheme-program-name))))
529 ;;; Do the user's customization...
531 (defcustom cmuscheme-load-hook nil
532 "This hook is run when cmuscheme is loaded in.
533 This is a good place to put keybindings."
534 :type 'hook
535 :group 'cmuscheme)
537 (run-hooks 'cmuscheme-load-hook)
539 (provide 'cmuscheme)
541 ;; arch-tag: e8795f4a-c496-45a2-97b4-8e0f2a2c57d2
542 ;;; cmuscheme.el ends here