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813f532d | 1 | ;;; ielm.el --- interaction mode for Emacs Lisp |
b578f267 | 2 | |
27cfbf4b | 3 | ;; Copyright (C) 1994, 2002, 2003 Free Software Foundation, Inc. |
813f532d RS |
4 | |
5 | ;; Author: David Smith <maa036@lancaster.ac.uk> | |
4228277d | 6 | ;; Maintainer: FSF |
813f532d RS |
7 | ;; Created: 25 Feb 1994 |
8 | ;; Keywords: lisp | |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
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. | |
16 | ||
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. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
25 | ;; Boston, MA 02111-1307, USA. | |
813f532d RS |
26 | |
27 | ;;; Commentary: | |
28 | ||
e848854a | 29 | ;; Provides a nice interface to evaluating Emacs Lisp expressions. |
813f532d RS |
30 | ;; Input is handled by the comint package, and output is passed |
31 | ;; through the pretty-printer. | |
32 | ||
33 | ;; To install: copy this file to a directory in your load-path, and | |
e848854a | 34 | ;; add the following line to your .emacs file: |
813f532d | 35 | ;; |
e848854a | 36 | ;; (autoload 'ielm "ielm" "Start an inferior Emacs Lisp session" t) |
813f532d | 37 | ;; |
326e87d2 | 38 | ;; For completion to work, the comint.el from Emacs 19.23 is |
813f532d RS |
39 | ;; required. If you do not have it, or if you are running Lemacs, |
40 | ;; also add the following code to your .emacs: | |
41 | ;; | |
42 | ;; (setq ielm-mode-hook | |
43 | ;; '(lambda nil | |
44 | ;; (define-key ielm-map "\t" | |
690ec649 | 45 | ;; '(lambda nil (interactive) (or (ielm-tab) |
813f532d RS |
46 | ;; (lisp-complete-symbol)))))) |
47 | ||
48 | ;; To start: M-x ielm. Type C-h m in the *ielm* buffer for more info. | |
49 | ||
690ec649 | 50 | ;; The latest version is available by WWW from |
813f532d RS |
51 | ;; http://mathssun5.lancs.ac.uk:2080/~maa036/elisp/dir.html |
52 | ;; or by anonymous FTP from | |
53 | ;; /anonymous@wingra.stat.wisc.edu:pub/src/emacs-lisp/ielm.el.gz | |
54 | ;; or from the author: David M. Smith <maa036@lancaster.ac.uk> | |
55 | ||
56 | ;;; Code: | |
57 | ||
58 | (require 'comint) | |
59 | (require 'pp) | |
60 | ||
61 | ;;; User variables | |
62 | ||
94114394 RS |
63 | (defgroup ielm nil |
64 | "Interaction mode for Emacs Lisp." | |
65 | :group 'lisp) | |
66 | ||
67 | ||
68 | (defcustom ielm-noisy t | |
69 | "*If non-nil, IELM will beep on error." | |
70 | :type 'boolean | |
71 | :group 'ielm) | |
813f532d | 72 | |
40cf8f25 JB |
73 | (defcustom ielm-prompt "ELISP> " |
74 | "Prompt used in IELM." | |
75 | :type 'string | |
76 | :group 'ielm | |
77 | :get #'(lambda (symbol) (substring-no-properties (symbol-value symbol))) | |
78 | :set #'(lambda (symbol value) (set symbol (propertize value 'read-only t 'rear-nonsticky t)))) | |
813f532d | 79 | |
94114394 | 80 | (defcustom ielm-dynamic-return t |
e848854a RS |
81 | "*Controls whether \\<ielm-map>\\[ielm-return] has intelligent behaviour in IELM. |
82 | If non-nil, \\[ielm-return] evaluates input for complete sexps, or inserts a newline | |
94114394 RS |
83 | and indents for incomplete sexps. If nil, always inserts newlines." |
84 | :type 'boolean | |
85 | :group 'ielm) | |
e848854a | 86 | |
94114394 | 87 | (defcustom ielm-dynamic-multiline-inputs t |
e848854a RS |
88 | "*Force multiline inputs to start from column zero? |
89 | If non-nil, after entering the first line of an incomplete sexp, a newline | |
90 | will be inserted after the prompt, moving the input to the next line. | |
91 | This gives more frame width for large indented sexps, and allows functions | |
94114394 RS |
92 | such as `edebug-defun' to work with such inputs." |
93 | :type 'boolean | |
94 | :group 'ielm) | |
813f532d | 95 | |
94114394 RS |
96 | (defcustom ielm-mode-hook nil |
97 | "*Hooks to be run when IELM (`inferior-emacs-lisp-mode') is started." | |
98 | :type 'hook | |
99 | :group 'ielm) | |
813f532d | 100 | |
d38e7d5f RS |
101 | (defvar * nil |
102 | "Most recent value evaluated in IELM.") | |
103 | ||
104 | (defvar ** nil | |
105 | "Second-most-recent value evaluated in IELM.") | |
106 | ||
107 | (defvar *** nil | |
108 | "Third-most-recent value evaluated in IELM.") | |
690ec649 | 109 | |
565f89ec SM |
110 | (defvar ielm-match-data nil |
111 | "Match data saved at the end of last command.") | |
112 | ||
1322516b | 113 | (defvar *1 nil |
5d9655bb RS |
114 | "During IELM evaluation, most recent value evaluated in IELM. |
115 | Normally identical to `*'. However, if the working buffer is an IELM | |
116 | buffer, distinct from the process buffer, then `*' gives the value in | |
71296446 | 117 | the working buffer, `*1' the value in the process buffer. |
5d9655bb RS |
118 | The intended value is only accessible during IELM evaluation.") |
119 | ||
120 | (defvar *2 nil | |
121 | "During IELM evaluation, second-most-recent value evaluated in IELM. | |
122 | Normally identical to `**'. However, if the working buffer is an IELM | |
123 | buffer, distinct from the process buffer, then `**' gives the value in | |
124 | the working buffer, `*2' the value in the process buffer. | |
125 | The intended value is only accessible during IELM evaluation.") | |
126 | ||
127 | (defvar *3 nil | |
128 | "During IELM evaluation, third-most-recent value evaluated in IELM. | |
129 | Normally identical to `***'. However, if the working buffer is an IELM | |
130 | buffer, distinct from the process buffer, then `***' gives the value in | |
131 | the working buffer, `*3' the value in the process buffer. | |
132 | The intended value is only accessible during IELM evaluation.") | |
133 | ||
813f532d RS |
134 | ;;; System variables |
135 | ||
136 | (defvar ielm-working-buffer nil | |
e848854a RS |
137 | "Buffer in which IELM sexps will be evaluated. |
138 | This variable is buffer-local.") | |
813f532d | 139 | |
690ec649 | 140 | (defvar ielm-header |
0a13146e | 141 | "*** Welcome to IELM *** Type (describe-mode) for help.\n" |
e848854a | 142 | "Message to display when IELM is started.") |
813f532d RS |
143 | |
144 | (defvar ielm-map nil) | |
145 | (if ielm-map nil | |
146 | (if (string-match "Lucid" emacs-version) | |
147 | ;; Lemacs | |
148 | (progn | |
149 | (setq ielm-map (make-sparse-keymap)) | |
150 | (set-keymap-parent ielm-map comint-mode-map)) | |
151 | ;; FSF | |
152 | (setq ielm-map (cons 'keymap comint-mode-map))) | |
153 | (define-key ielm-map "\t" 'comint-dynamic-complete) | |
154 | (define-key ielm-map "\C-m" 'ielm-return) | |
e848854a RS |
155 | (define-key ielm-map "\C-j" 'ielm-send-input) |
156 | (define-key ielm-map "\e\C-x" 'eval-defun) ; for consistency with | |
157 | (define-key ielm-map "\e\t" 'lisp-complete-symbol) ; lisp-interaction-mode | |
690ec649 | 158 | ;; These bindings are from `lisp-mode-shared-map' -- can you inherit |
e848854a | 159 | ;; from more than one keymap?? |
690ec649 | 160 | (define-key ielm-map "\e\C-q" 'indent-sexp) |
e848854a RS |
161 | (define-key ielm-map "\177" 'backward-delete-char-untabify) |
162 | ;; Some convenience bindings for setting the working buffer | |
163 | (define-key ielm-map "\C-c\C-b" 'ielm-change-working-buffer) | |
164 | (define-key ielm-map "\C-c\C-f" 'ielm-display-working-buffer) | |
165 | (define-key ielm-map "\C-c\C-v" 'ielm-print-working-buffer)) | |
813f532d | 166 | |
9d42eea3 | 167 | (defvar ielm-font-lock-keywords |
690ec649 | 168 | (list |
9d42eea3 | 169 | (cons (concat "^" (regexp-quote ielm-prompt)) 'font-lock-keyword-face) |
883212ce SM |
170 | '("\\(^\\*\\*\\*[^*]+\\*\\*\\*\\)\\(.*$\\)" |
171 | (1 font-lock-comment-face) | |
172 | (2 font-lock-constant-face))) | |
9d42eea3 | 173 | "Additional expressions to highlight in ielm buffers.") |
690ec649 | 174 | |
813f532d RS |
175 | ;;; Completion stuff |
176 | ||
177 | (defun ielm-tab nil | |
e848854a | 178 | "Possibly indent the current line as lisp code." |
813f532d RS |
179 | (interactive) |
180 | (if (or (eq (preceding-char) ?\n) | |
181 | (eq (char-syntax (preceding-char)) ? )) | |
182 | (progn | |
183 | (ielm-indent-line) | |
184 | t))) | |
690ec649 | 185 | |
813f532d | 186 | (defun ielm-complete-symbol nil |
e848854a RS |
187 | "Complete the lisp symbol before point." |
188 | ;; A wrapper for lisp-complete symbol that returns non-nil if | |
189 | ;; completion has occurred | |
813f532d | 190 | (let* ((btick (buffer-modified-tick)) |
e58df0dc | 191 | (cbuffer (get-buffer "*Completions*")) |
813f532d RS |
192 | (ctick (and cbuffer (buffer-modified-tick cbuffer)))) |
193 | (lisp-complete-symbol) | |
194 | ;; completion has occurred if: | |
690ec649 | 195 | (or |
813f532d | 196 | ;; the buffer has been modified |
690ec649 | 197 | (not (= btick (buffer-modified-tick))) |
a7acbbe4 | 198 | ;; a completions buffer has been modified or created |
813f532d RS |
199 | (if cbuffer |
200 | (not (= ctick (buffer-modified-tick cbuffer))) | |
e58df0dc | 201 | (get-buffer "*Completions*"))))) |
813f532d RS |
202 | |
203 | (defun ielm-complete-filename nil | |
e848854a | 204 | "Dynamically complete filename before point, if in a string." |
813f532d RS |
205 | (if (nth 3 (parse-partial-sexp comint-last-input-start (point))) |
206 | (comint-dynamic-complete-filename))) | |
690ec649 | 207 | |
813f532d | 208 | (defun ielm-indent-line nil |
e848854a | 209 | "Indent the current line as Lisp code if it is not a prompt line." |
3250010d | 210 | (when (save-excursion (comint-bol) (bolp)) |
813f532d RS |
211 | (lisp-indent-line))) |
212 | ||
e848854a RS |
213 | ;;; Working buffer manipulation |
214 | ||
215 | (defun ielm-print-working-buffer nil | |
216 | "Print the current IELM working buffer's name in the echo area." | |
217 | (interactive) | |
218 | (message "The current working buffer is: %s" (buffer-name ielm-working-buffer))) | |
219 | ||
220 | (defun ielm-display-working-buffer nil | |
221 | "Display the current IELM working buffer. | |
222 | Don't forget that selecting that buffer will change its value of `point' | |
223 | to its value of `window-point'!" | |
224 | (interactive) | |
225 | (display-buffer ielm-working-buffer) | |
226 | (ielm-print-working-buffer)) | |
227 | ||
228 | (defun ielm-change-working-buffer (buf) | |
229 | "Change the current IELM working buffer to BUF. | |
230 | This is the buffer in which all sexps entered at the IELM prompt are | |
231 | evaluated. You can achieve the same effect with a call to | |
232 | `set-buffer' at the IELM prompt." | |
233 | (interactive "bSet working buffer to: ") | |
234 | (setq ielm-working-buffer (or (get-buffer buf) (error "No such buffer"))) | |
235 | (ielm-print-working-buffer)) | |
236 | ||
813f532d RS |
237 | ;;; Other bindings |
238 | ||
239 | (defun ielm-return nil | |
e848854a RS |
240 | "Newline and indent, or evaluate the sexp before the prompt. |
241 | Complete sexps are evaluated; for incomplete sexps inserts a newline | |
242 | and indents. If however `ielm-dynamic-return' is nil, this always | |
243 | simply inserts a newline." | |
813f532d | 244 | (interactive) |
690ec649 SS |
245 | (if ielm-dynamic-return |
246 | (let ((state | |
813f532d RS |
247 | (save-excursion |
248 | (end-of-line) | |
249 | (parse-partial-sexp (ielm-pm) | |
250 | (point))))) | |
251 | (if (and (< (car state) 1) (not (nth 3 state))) | |
252 | (ielm-send-input) | |
e848854a RS |
253 | (if (and ielm-dynamic-multiline-inputs |
254 | (save-excursion | |
255 | (beginning-of-line) | |
256 | (looking-at comint-prompt-regexp))) | |
257 | (save-excursion | |
258 | (goto-char (ielm-pm)) | |
259 | (newline 1))) | |
813f532d RS |
260 | (newline-and-indent))) |
261 | (newline))) | |
262 | ||
94aba130 RS |
263 | (defvar ielm-input) |
264 | ||
813f532d | 265 | (defun ielm-input-sender (proc input) |
690ec649 | 266 | ;; Just sets the variable ielm-input, which is in the scope of |
e848854a | 267 | ;; `ielm-send-input's call. |
813f532d RS |
268 | (setq ielm-input input)) |
269 | ||
270 | (defun ielm-send-input nil | |
e848854a | 271 | "Evaluate the Emacs Lisp expression after the prompt." |
813f532d RS |
272 | (interactive) |
273 | (let ((buf (current-buffer)) | |
274 | ielm-input) ; set by ielm-input-sender | |
275 | (comint-send-input) ; update history, markers etc. | |
276 | (ielm-eval-input ielm-input))) | |
277 | ||
278 | ;;; Utility functions | |
279 | ||
280 | (defun ielm-is-whitespace (string) | |
e848854a | 281 | "Return non-nil if STRING is all whitespace." |
813f532d RS |
282 | (or (string= string "") (string-match "\\`[ \t\n]+\\'" string))) |
283 | ||
813f532d RS |
284 | ;;; Evaluation |
285 | ||
e848854a RS |
286 | (defun ielm-eval-input (ielm-string) |
287 | "Evaluate the Lisp expression IELM-STRING, and pretty-print the result." | |
813f532d | 288 | ;; This is the function that actually `sends' the input to the |
e848854a | 289 | ;; `inferior Lisp process'. All comint-send-input does is works out |
813f532d RS |
290 | ;; what that input is. What this function does is evaluates that |
291 | ;; input and produces `output' which gets inserted into the buffer, | |
292 | ;; along with a new prompt. A better way of doing this might have | |
293 | ;; been to actually send the output to the `cat' process, and write | |
294 | ;; this as in output filter that converted sexps in the output | |
295 | ;; stream to their evaluated value. But that would have involved | |
296 | ;; more process coordination than I was happy to deal with. | |
e848854a RS |
297 | ;; |
298 | ;; NOTE: all temporary variables in this function will be in scope | |
299 | ;; during the eval, and so need to have non-clashing names. | |
300 | (let (ielm-form ; form to evaluate | |
301 | ielm-pos ; End posn of parse in string | |
302 | ielm-result ; Result, or error message | |
303 | ielm-error-type ; string, nil if no error | |
304 | (ielm-output "") ; result to display | |
305 | (ielm-wbuf ielm-working-buffer) ; current buffer after evaluation | |
306 | (ielm-pmark (ielm-pm))) | |
307 | (if (not (ielm-is-whitespace ielm-string)) | |
813f532d RS |
308 | (progn |
309 | (condition-case err | |
310 | (let (rout) | |
e848854a RS |
311 | (setq rout (read-from-string ielm-string)) |
312 | (setq ielm-form (car rout)) | |
313 | (setq ielm-pos (cdr rout))) | |
568bbe5e | 314 | (error (setq ielm-result (error-message-string err)) |
e848854a RS |
315 | (setq ielm-error-type "Read error"))) |
316 | (if ielm-error-type nil | |
317 | ;; Make sure working buffer has not been killed | |
318 | (if (not (buffer-name ielm-working-buffer)) | |
319 | (setq ielm-result "Working buffer has been killed" | |
320 | ielm-error-type "IELM Error" | |
321 | ielm-wbuf (current-buffer)) | |
322 | (if (ielm-is-whitespace (substring ielm-string ielm-pos)) | |
5d9655bb RS |
323 | ;; To correctly handle the ielm-local variables *, |
324 | ;; ** and ***, we need a temporary buffer to be | |
325 | ;; current at entry to the inner of the next two let | |
326 | ;; forms. We need another temporary buffer to exit | |
327 | ;; that same let. To avoid problems, neither of | |
328 | ;; these buffers should be alive during the | |
329 | ;; evaluation of ielm-form. | |
330 | (let ((*1 *) | |
331 | (*2 **) | |
332 | (*3 ***) | |
333 | ielm-temp-buffer) | |
565f89ec | 334 | (set-match-data ielm-match-data) |
e848854a | 335 | (save-excursion |
5d9655bb RS |
336 | (with-temp-buffer |
337 | (condition-case err | |
338 | (unwind-protect | |
339 | ;; The next let form creates default | |
340 | ;; bindings for *, ** and ***. But | |
341 | ;; these default bindings are | |
342 | ;; identical to the ielm-local | |
343 | ;; bindings. Hence, during the | |
344 | ;; evaluation of ielm-form, the | |
345 | ;; ielm-local values are going to be | |
346 | ;; used in all buffers except for | |
347 | ;; other ielm buffers, which override | |
348 | ;; them. Normally, the variables *1, | |
349 | ;; *2 and *3 also have default | |
350 | ;; bindings, which are not overridden. | |
351 | (let ((* *1) | |
352 | (** *2) | |
353 | (*** *3)) | |
354 | (kill-buffer (current-buffer)) | |
355 | (set-buffer ielm-wbuf) | |
356 | (setq ielm-result (eval ielm-form)) | |
357 | (setq ielm-wbuf (current-buffer)) | |
358 | (setq | |
359 | ielm-temp-buffer | |
360 | (generate-new-buffer " *ielm-temp*")) | |
361 | (set-buffer ielm-temp-buffer)) | |
362 | (when ielm-temp-buffer | |
363 | (kill-buffer ielm-temp-buffer))) | |
5967d963 | 364 | (error (setq ielm-result (error-message-string err)) |
5d9655bb RS |
365 | (setq ielm-error-type "Eval error")) |
366 | (quit (setq ielm-result "Quit during evaluation") | |
367 | (setq ielm-error-type "Eval error"))))) | |
565f89ec | 368 | (setq ielm-match-data (match-data))) |
e848854a RS |
369 | (setq ielm-error-type "IELM error") |
370 | (setq ielm-result "More than one sexp in input")))) | |
813f532d RS |
371 | |
372 | ;; If the eval changed the current buffer, mention it here | |
e848854a RS |
373 | (if (eq ielm-wbuf ielm-working-buffer) nil |
374 | (message "current buffer is now: %s" ielm-wbuf) | |
375 | (setq ielm-working-buffer ielm-wbuf)) | |
813f532d | 376 | |
e848854a RS |
377 | (goto-char ielm-pmark) |
378 | (if (not ielm-error-type) | |
813f532d RS |
379 | (condition-case err |
380 | ;; Self-referential objects cause loops in the printer, so | |
381 | ;; trap quits here. May as well do errors, too | |
e848854a RS |
382 | (setq ielm-output (concat ielm-output (pp-to-string ielm-result))) |
383 | (error (setq ielm-error-type "IELM Error") | |
384 | (setq ielm-result "Error during pretty-printing (bug in pp)")) | |
385 | (quit (setq ielm-error-type "IELM Error") | |
386 | (setq ielm-result "Quit during pretty-printing")))) | |
387 | (if ielm-error-type | |
813f532d RS |
388 | (progn |
389 | (if ielm-noisy (ding)) | |
e848854a RS |
390 | (setq ielm-output (concat ielm-output "*** " ielm-error-type " *** ")) |
391 | (setq ielm-output (concat ielm-output ielm-result))) | |
d38e7d5f | 392 | ;; There was no error, so shift the *** values |
71d54f88 RS |
393 | (setq *** **) |
394 | (setq ** *) | |
395 | (setq * ielm-result)) | |
e848854a RS |
396 | (setq ielm-output (concat ielm-output "\n")))) |
397 | (setq ielm-output (concat ielm-output ielm-prompt)) | |
398 | (comint-output-filter (ielm-process) ielm-output))) | |
813f532d RS |
399 | |
400 | ;;; Process and marker utilities | |
401 | ||
402 | (defun ielm-process nil | |
e848854a | 403 | ;; Return the current buffer's process. |
813f532d RS |
404 | (get-buffer-process (current-buffer))) |
405 | ||
406 | (defun ielm-pm nil | |
e848854a | 407 | ;; Return the process mark of the current buffer. |
813f532d RS |
408 | (process-mark (get-buffer-process (current-buffer)))) |
409 | ||
410 | (defun ielm-set-pm (pos) | |
e848854a | 411 | ;; Set the process mark in the current buffer to POS. |
813f532d RS |
412 | (set-marker (process-mark (get-buffer-process (current-buffer))) pos)) |
413 | ||
414 | ;;; Major mode | |
415 | ||
95b20f3b RS |
416 | (put 'inferior-emacs-lisp-mode 'mode-class 'special) |
417 | ||
813f532d | 418 | (defun inferior-emacs-lisp-mode nil |
e848854a RS |
419 | "Major mode for interactively evaluating Emacs Lisp expressions. |
420 | Uses the interface provided by `comint-mode' (which see). | |
421 | ||
66f06793 SM |
422 | * \\<ielm-map>\\[ielm-send-input] evaluates the sexp following the prompt. There must be at most |
423 | one top level sexp per prompt. | |
813f532d | 424 | |
e848854a RS |
425 | * \\[ielm-return] inserts a newline and indents, or evaluates a |
426 | complete expression (but see variable `ielm-dynamic-return'). | |
427 | Inputs longer than one line are moved to the line following the | |
428 | prompt (but see variable `ielm-dynamic-multiline-inputs'). | |
429 | ||
690ec649 | 430 | * \\[comint-dynamic-complete] completes Lisp symbols (or filenames, within strings), |
e848854a | 431 | or indents the line if there is nothing to complete. |
813f532d | 432 | |
e848854a RS |
433 | The current working buffer may be changed (with a call to |
434 | `set-buffer', or with \\[ielm-change-working-buffer]), and its value | |
435 | is preserved between successive evaluations. In this way, expressions | |
436 | may be evaluated in a different buffer than the *ielm* buffer. | |
437 | Display the name of the working buffer with \\[ielm-print-working-buffer], | |
438 | or the buffer itself with \\[ielm-display-working-buffer]. | |
813f532d | 439 | |
5d9655bb RS |
440 | During evaluations, the values of the variables `*', `**', and `***' |
441 | are the results of the previous, second previous and third previous | |
442 | evaluations respectively. If the working buffer is another IELM | |
443 | buffer, then the values in the working buffer are used. The variables | |
444 | `*1', `*2' and `*3', yield the process buffer values. | |
445 | ||
e848854a RS |
446 | Expressions evaluated by IELM are not subject to `debug-on-quit' or |
447 | `debug-on-error'. | |
813f532d RS |
448 | |
449 | The behaviour of IELM may be customised with the following variables: | |
450 | * To stop beeping on error, set `ielm-noisy' to nil | |
451 | * If you don't like the prompt, you can change it by setting `ielm-prompt'. | |
452 | * Set `ielm-dynamic-return' to nil for bindings like `lisp-interaction-mode' | |
453 | * Entry to this mode runs `comint-mode-hook' and `ielm-mode-hook' | |
454 | (in that order). | |
455 | ||
456 | Customised bindings may be defined in `ielm-map', which currently contains: | |
457 | \\{ielm-map}" | |
458 | (interactive) | |
459 | (comint-mode) | |
460 | (setq comint-prompt-regexp (concat "^" (regexp-quote ielm-prompt))) | |
461 | (make-local-variable 'paragraph-start) | |
462 | (setq paragraph-start comint-prompt-regexp) | |
463 | (setq comint-input-sender 'ielm-input-sender) | |
464 | (setq comint-process-echoes nil) | |
27cfbf4b | 465 | (make-local-variable 'comint-dynamic-complete-functions) |
690ec649 | 466 | (setq comint-dynamic-complete-functions |
813f532d | 467 | '(ielm-tab comint-replace-by-expanded-history ielm-complete-filename ielm-complete-symbol)) |
e848854a | 468 | (setq comint-get-old-input 'ielm-get-old-input) |
34ce46c8 KH |
469 | (make-local-variable 'comint-completion-addsuffix) |
470 | (setq comint-completion-addsuffix | |
471 | (cons (char-to-string directory-sep-char) "")) | |
813f532d RS |
472 | |
473 | (setq major-mode 'inferior-emacs-lisp-mode) | |
474 | (setq mode-name "IELM") | |
475 | (use-local-map ielm-map) | |
476 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
477 | ||
478 | (make-local-variable 'indent-line-function) | |
479 | (make-local-variable 'ielm-working-buffer) | |
480 | (setq ielm-working-buffer (current-buffer)) | |
481 | (setq indent-line-function 'ielm-indent-line) | |
950086e6 KH |
482 | (make-local-variable 'fill-paragraph-function) |
483 | (setq fill-paragraph-function 'lisp-fill-paragraph) | |
813f532d | 484 | |
e848854a | 485 | ;; Value holders |
fed9da13 | 486 | (make-local-variable '*) |
5d9655bb | 487 | (setq * nil) |
fed9da13 | 488 | (make-local-variable '**) |
5d9655bb | 489 | (setq ** nil) |
fed9da13 | 490 | (make-local-variable '***) |
5d9655bb | 491 | (setq *** nil) |
565f89ec | 492 | (set (make-local-variable 'ielm-match-data) nil) |
813f532d | 493 | |
9d42eea3 RS |
494 | ;; font-lock support |
495 | (make-local-variable 'font-lock-defaults) | |
690ec649 | 496 | (setq font-lock-defaults |
9d42eea3 | 497 | '(ielm-font-lock-keywords nil nil ((?: . "w") (?- . "w") (?* . "w")))) |
690ec649 | 498 | |
813f532d | 499 | ;; A dummy process to keep comint happy. It will never get any input |
20b13009 | 500 | (unless (comint-check-proc (current-buffer)) |
33a65176 JR |
501 | ;; Was cat, but on non-Unix platforms that might not exist, so |
502 | ;; use hexl instead, which is part of the Emacs distribution. | |
66f06793 SM |
503 | (condition-case nil |
504 | (start-process "ielm" (current-buffer) "hexl") | |
505 | (file-error (start-process "ielm" (current-buffer) "cat"))) | |
813f532d RS |
506 | (process-kill-without-query (ielm-process)) |
507 | (goto-char (point-max)) | |
71296446 | 508 | |
20b13009 MB |
509 | ;; Lisp output can include raw characters that confuse comint's |
510 | ;; carriage control code. | |
511 | (set (make-local-variable 'comint-inhibit-carriage-motion) t) | |
512 | ||
813f532d RS |
513 | ;; Add a silly header |
514 | (insert ielm-header) | |
515 | (ielm-set-pm (point-max)) | |
5c584c35 RS |
516 | (unless comint-use-prompt-regexp-instead-of-fields |
517 | (add-text-properties | |
66f06793 | 518 | (point-min) (point-max) |
5c584c35 | 519 | '(rear-nonsticky t field output inhibit-line-move-field-capture t))) |
813f532d RS |
520 | (comint-output-filter (ielm-process) ielm-prompt) |
521 | (set-marker comint-last-input-start (ielm-pm)) | |
522 | (set-process-filter (get-buffer-process (current-buffer)) 'comint-output-filter)) | |
20b13009 | 523 | |
813f532d RS |
524 | (run-hooks 'ielm-mode-hook)) |
525 | ||
e848854a RS |
526 | (defun ielm-get-old-input nil |
527 | ;; Return the previous input surrounding point | |
528 | (save-excursion | |
529 | (beginning-of-line) | |
530 | (if (looking-at comint-prompt-regexp) nil | |
531 | (re-search-backward comint-prompt-regexp)) | |
532 | (comint-skip-prompt) | |
533 | (buffer-substring (point) (progn (forward-sexp 1) (point))))) | |
534 | ||
813f532d RS |
535 | ;;; User command |
536 | ||
9e983c78 RS |
537 | ;;;###autoload (add-hook 'same-window-buffer-names "*ielm*") |
538 | ||
e848854a | 539 | ;;;###autoload |
813f532d | 540 | (defun ielm nil |
e848854a | 541 | "Interactively evaluate Emacs Lisp expressions. |
9e983c78 | 542 | Switches to the buffer `*ielm*', or creates it if it does not exist." |
813f532d | 543 | (interactive) |
9e983c78 RS |
544 | (if (comint-check-proc "*ielm*") |
545 | nil | |
546 | (save-excursion | |
813f532d RS |
547 | (set-buffer (get-buffer-create "*ielm*")) |
548 | (inferior-emacs-lisp-mode))) | |
9e983c78 | 549 | (pop-to-buffer "*ielm*")) |
813f532d | 550 | |
896546cd RS |
551 | (provide 'ielm) |
552 | ||
e848854a | 553 | ;;; ielm.el ends here |