Commit | Line | Data |
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813f532d | 1 | ;;; ielm.el --- interaction mode for Emacs Lisp |
b578f267 | 2 | |
0d30b337 | 3 | ;; Copyright (C) 1994, 2002, 2003, 2004, 2005 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 | 23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
086add15 LK |
24 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
25 | ;; Boston, MA 02110-1301, 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 | ||
813f532d RS |
33 | ;; To start: M-x ielm. Type C-h m in the *ielm* buffer for more info. |
34 | ||
813f532d RS |
35 | ;;; Code: |
36 | ||
37 | (require 'comint) | |
38 | (require 'pp) | |
39 | ||
40 | ;;; User variables | |
41 | ||
94114394 RS |
42 | (defgroup ielm nil |
43 | "Interaction mode for Emacs Lisp." | |
44 | :group 'lisp) | |
45 | ||
46 | ||
47 | (defcustom ielm-noisy t | |
48 | "*If non-nil, IELM will beep on error." | |
49 | :type 'boolean | |
50 | :group 'ielm) | |
813f532d | 51 | |
759f960a LT |
52 | (defcustom ielm-prompt-read-only t |
53 | "If non-nil, the IELM prompt is read only. | |
7655d378 | 54 | The read only region includes the newline before the prompt. |
759f960a | 55 | Setting this variable does not affect existing IELM runs. |
016b8f71 | 56 | This works by setting the buffer-local value of `comint-prompt-read-only'. |
7655d378 LT |
57 | Setting that value directly affects new prompts in the current buffer. |
58 | ||
59 | If this option is enabled, then the safe way to temporarily | |
60 | override the read-only-ness of ielm prompts is to call | |
61 | `comint-kill-whole-line' or `comint-kill-region' with no | |
62 | narrowing in effect. This way you will be certain that none of | |
63 | the remaining prompts will be accidentally messed up. You may | |
64 | wish to put something like the following in your `.emacs' file: | |
65 | ||
66 | \(add-hook 'ielm-mode-hook | |
67 | '(lambda () | |
1ab3c04f | 68 | (define-key ielm-map \"\\C-w\" 'comint-kill-region) |
7655d378 LT |
69 | (define-key ielm-map [C-S-backspace] |
70 | 'comint-kill-whole-line))) | |
71 | ||
72 | If you set `comint-prompt-read-only' to t, you might wish to use | |
73 | `comint-mode-hook' and `comint-mode-map' instead of | |
74 | `ielm-mode-hook' and `ielm-map'. That will affect all comint | |
75 | buffers, including ielm buffers. If you sometimes use ielm on | |
76 | text-only terminals or with `emacs -nw', you might wish to use | |
77 | another binding for `comint-kill-whole-line'." | |
759f960a LT |
78 | :type 'boolean |
79 | :group 'ielm | |
bf247b6e | 80 | :version "22.1") |
759f960a | 81 | |
40cf8f25 | 82 | (defcustom ielm-prompt "ELISP> " |
759f960a | 83 | "Prompt used in IELM. |
016b8f71 | 84 | Setting this variable does not affect existing IELM runs. |
ee9cd72d LT |
85 | |
86 | Interrupting the IELM process with \\<ielm-map>\\[comint-interrupt-subjob], | |
87 | and then restarting it using \\[ielm], makes the then current | |
016b8f71 | 88 | default value affect _new_ prompts. Unless the new prompt |
ee9cd72d LT |
89 | differs only in text properties from the old one, IELM will no |
90 | longer recognize the old prompts. However, executing \\[ielm] | |
91 | does not update the prompt of an *ielm* buffer with a running process. | |
9eca7c03 | 92 | For IELM buffers that are not called `*ielm*', you can execute |
ee9cd72d LT |
93 | \\[inferior-emacs-lisp-mode] in that IELM buffer to update the value, |
94 | for new prompts. This works even if the buffer has a running process." | |
40cf8f25 | 95 | :type 'string |
759f960a | 96 | :group 'ielm) |
813f532d | 97 | |
016b8f71 LT |
98 | (defvar ielm-prompt-internal "ELISP> " |
99 | "Stored value of `ielm-prompt' in the current IELM buffer. | |
100 | This is an internal variable used by IELM. Its purpose is to | |
101 | prevent a running IELM process from being messed up when the user | |
102 | customizes `ielm-prompt'.") | |
103 | ||
94114394 | 104 | (defcustom ielm-dynamic-return t |
291cfc0c | 105 | "*Controls whether \\<ielm-map>\\[ielm-return] has intelligent behavior in IELM. |
e848854a | 106 | If non-nil, \\[ielm-return] evaluates input for complete sexps, or inserts a newline |
94114394 RS |
107 | and indents for incomplete sexps. If nil, always inserts newlines." |
108 | :type 'boolean | |
109 | :group 'ielm) | |
e848854a | 110 | |
94114394 | 111 | (defcustom ielm-dynamic-multiline-inputs t |
e848854a RS |
112 | "*Force multiline inputs to start from column zero? |
113 | If non-nil, after entering the first line of an incomplete sexp, a newline | |
114 | will be inserted after the prompt, moving the input to the next line. | |
115 | This gives more frame width for large indented sexps, and allows functions | |
94114394 RS |
116 | such as `edebug-defun' to work with such inputs." |
117 | :type 'boolean | |
118 | :group 'ielm) | |
813f532d | 119 | |
94114394 RS |
120 | (defcustom ielm-mode-hook nil |
121 | "*Hooks to be run when IELM (`inferior-emacs-lisp-mode') is started." | |
10fea268 | 122 | :options '(turn-on-eldoc-mode) |
94114394 RS |
123 | :type 'hook |
124 | :group 'ielm) | |
813f532d | 125 | |
d38e7d5f RS |
126 | (defvar * nil |
127 | "Most recent value evaluated in IELM.") | |
128 | ||
129 | (defvar ** nil | |
130 | "Second-most-recent value evaluated in IELM.") | |
131 | ||
132 | (defvar *** nil | |
133 | "Third-most-recent value evaluated in IELM.") | |
690ec649 | 134 | |
565f89ec SM |
135 | (defvar ielm-match-data nil |
136 | "Match data saved at the end of last command.") | |
137 | ||
1322516b | 138 | (defvar *1 nil |
5d9655bb RS |
139 | "During IELM evaluation, most recent value evaluated in IELM. |
140 | Normally identical to `*'. However, if the working buffer is an IELM | |
141 | buffer, distinct from the process buffer, then `*' gives the value in | |
71296446 | 142 | the working buffer, `*1' the value in the process buffer. |
5d9655bb RS |
143 | The intended value is only accessible during IELM evaluation.") |
144 | ||
145 | (defvar *2 nil | |
146 | "During IELM evaluation, second-most-recent value evaluated in IELM. | |
147 | Normally identical to `**'. However, if the working buffer is an IELM | |
148 | buffer, distinct from the process buffer, then `**' gives the value in | |
149 | the working buffer, `*2' the value in the process buffer. | |
150 | The intended value is only accessible during IELM evaluation.") | |
151 | ||
152 | (defvar *3 nil | |
153 | "During IELM evaluation, third-most-recent value evaluated in IELM. | |
154 | Normally identical to `***'. However, if the working buffer is an IELM | |
155 | buffer, distinct from the process buffer, then `***' gives the value in | |
156 | the working buffer, `*3' the value in the process buffer. | |
157 | The intended value is only accessible during IELM evaluation.") | |
158 | ||
813f532d RS |
159 | ;;; System variables |
160 | ||
161 | (defvar ielm-working-buffer nil | |
e848854a RS |
162 | "Buffer in which IELM sexps will be evaluated. |
163 | This variable is buffer-local.") | |
813f532d | 164 | |
690ec649 | 165 | (defvar ielm-header |
0a13146e | 166 | "*** Welcome to IELM *** Type (describe-mode) for help.\n" |
e848854a | 167 | "Message to display when IELM is started.") |
813f532d RS |
168 | |
169 | (defvar ielm-map nil) | |
170 | (if ielm-map nil | |
171 | (if (string-match "Lucid" emacs-version) | |
172 | ;; Lemacs | |
173 | (progn | |
174 | (setq ielm-map (make-sparse-keymap)) | |
175 | (set-keymap-parent ielm-map comint-mode-map)) | |
176 | ;; FSF | |
177 | (setq ielm-map (cons 'keymap comint-mode-map))) | |
178 | (define-key ielm-map "\t" 'comint-dynamic-complete) | |
179 | (define-key ielm-map "\C-m" 'ielm-return) | |
e848854a RS |
180 | (define-key ielm-map "\C-j" 'ielm-send-input) |
181 | (define-key ielm-map "\e\C-x" 'eval-defun) ; for consistency with | |
182 | (define-key ielm-map "\e\t" 'lisp-complete-symbol) ; lisp-interaction-mode | |
690ec649 | 183 | ;; These bindings are from `lisp-mode-shared-map' -- can you inherit |
e848854a | 184 | ;; from more than one keymap?? |
690ec649 | 185 | (define-key ielm-map "\e\C-q" 'indent-sexp) |
e848854a RS |
186 | (define-key ielm-map "\177" 'backward-delete-char-untabify) |
187 | ;; Some convenience bindings for setting the working buffer | |
188 | (define-key ielm-map "\C-c\C-b" 'ielm-change-working-buffer) | |
189 | (define-key ielm-map "\C-c\C-f" 'ielm-display-working-buffer) | |
190 | (define-key ielm-map "\C-c\C-v" 'ielm-print-working-buffer)) | |
813f532d | 191 | |
9d42eea3 | 192 | (defvar ielm-font-lock-keywords |
016b8f71 | 193 | '(("\\(^\\*\\*\\*[^*]+\\*\\*\\*\\)\\(.*$\\)" |
883212ce SM |
194 | (1 font-lock-comment-face) |
195 | (2 font-lock-constant-face))) | |
9d42eea3 | 196 | "Additional expressions to highlight in ielm buffers.") |
690ec649 | 197 | |
813f532d RS |
198 | ;;; Completion stuff |
199 | ||
200 | (defun ielm-tab nil | |
e5927b52 | 201 | "Possibly indent the current line as Lisp code." |
813f532d RS |
202 | (interactive) |
203 | (if (or (eq (preceding-char) ?\n) | |
204 | (eq (char-syntax (preceding-char)) ? )) | |
205 | (progn | |
206 | (ielm-indent-line) | |
207 | t))) | |
690ec649 | 208 | |
813f532d | 209 | (defun ielm-complete-symbol nil |
e5927b52 | 210 | "Complete the Lisp symbol before point." |
e848854a RS |
211 | ;; A wrapper for lisp-complete symbol that returns non-nil if |
212 | ;; completion has occurred | |
813f532d | 213 | (let* ((btick (buffer-modified-tick)) |
e58df0dc | 214 | (cbuffer (get-buffer "*Completions*")) |
813f532d RS |
215 | (ctick (and cbuffer (buffer-modified-tick cbuffer)))) |
216 | (lisp-complete-symbol) | |
217 | ;; completion has occurred if: | |
690ec649 | 218 | (or |
813f532d | 219 | ;; the buffer has been modified |
690ec649 | 220 | (not (= btick (buffer-modified-tick))) |
a7acbbe4 | 221 | ;; a completions buffer has been modified or created |
813f532d RS |
222 | (if cbuffer |
223 | (not (= ctick (buffer-modified-tick cbuffer))) | |
e58df0dc | 224 | (get-buffer "*Completions*"))))) |
813f532d RS |
225 | |
226 | (defun ielm-complete-filename nil | |
e848854a | 227 | "Dynamically complete filename before point, if in a string." |
813f532d RS |
228 | (if (nth 3 (parse-partial-sexp comint-last-input-start (point))) |
229 | (comint-dynamic-complete-filename))) | |
690ec649 | 230 | |
813f532d | 231 | (defun ielm-indent-line nil |
e848854a | 232 | "Indent the current line as Lisp code if it is not a prompt line." |
3250010d | 233 | (when (save-excursion (comint-bol) (bolp)) |
813f532d RS |
234 | (lisp-indent-line))) |
235 | ||
e848854a RS |
236 | ;;; Working buffer manipulation |
237 | ||
238 | (defun ielm-print-working-buffer nil | |
239 | "Print the current IELM working buffer's name in the echo area." | |
240 | (interactive) | |
241 | (message "The current working buffer is: %s" (buffer-name ielm-working-buffer))) | |
242 | ||
243 | (defun ielm-display-working-buffer nil | |
244 | "Display the current IELM working buffer. | |
245 | Don't forget that selecting that buffer will change its value of `point' | |
246 | to its value of `window-point'!" | |
247 | (interactive) | |
248 | (display-buffer ielm-working-buffer) | |
249 | (ielm-print-working-buffer)) | |
250 | ||
251 | (defun ielm-change-working-buffer (buf) | |
252 | "Change the current IELM working buffer to BUF. | |
253 | This is the buffer in which all sexps entered at the IELM prompt are | |
254 | evaluated. You can achieve the same effect with a call to | |
255 | `set-buffer' at the IELM prompt." | |
256 | (interactive "bSet working buffer to: ") | |
257 | (setq ielm-working-buffer (or (get-buffer buf) (error "No such buffer"))) | |
258 | (ielm-print-working-buffer)) | |
259 | ||
813f532d RS |
260 | ;;; Other bindings |
261 | ||
262 | (defun ielm-return nil | |
e848854a RS |
263 | "Newline and indent, or evaluate the sexp before the prompt. |
264 | Complete sexps are evaluated; for incomplete sexps inserts a newline | |
265 | and indents. If however `ielm-dynamic-return' is nil, this always | |
266 | simply inserts a newline." | |
813f532d | 267 | (interactive) |
690ec649 SS |
268 | (if ielm-dynamic-return |
269 | (let ((state | |
813f532d RS |
270 | (save-excursion |
271 | (end-of-line) | |
272 | (parse-partial-sexp (ielm-pm) | |
273 | (point))))) | |
274 | (if (and (< (car state) 1) (not (nth 3 state))) | |
275 | (ielm-send-input) | |
e848854a RS |
276 | (if (and ielm-dynamic-multiline-inputs |
277 | (save-excursion | |
278 | (beginning-of-line) | |
279 | (looking-at comint-prompt-regexp))) | |
280 | (save-excursion | |
281 | (goto-char (ielm-pm)) | |
282 | (newline 1))) | |
813f532d RS |
283 | (newline-and-indent))) |
284 | (newline))) | |
285 | ||
94aba130 RS |
286 | (defvar ielm-input) |
287 | ||
813f532d | 288 | (defun ielm-input-sender (proc input) |
690ec649 | 289 | ;; Just sets the variable ielm-input, which is in the scope of |
e848854a | 290 | ;; `ielm-send-input's call. |
813f532d RS |
291 | (setq ielm-input input)) |
292 | ||
293 | (defun ielm-send-input nil | |
e848854a | 294 | "Evaluate the Emacs Lisp expression after the prompt." |
813f532d | 295 | (interactive) |
016b8f71 | 296 | (let (ielm-input) ; set by ielm-input-sender |
813f532d RS |
297 | (comint-send-input) ; update history, markers etc. |
298 | (ielm-eval-input ielm-input))) | |
299 | ||
300 | ;;; Utility functions | |
301 | ||
302 | (defun ielm-is-whitespace (string) | |
e848854a | 303 | "Return non-nil if STRING is all whitespace." |
813f532d RS |
304 | (or (string= string "") (string-match "\\`[ \t\n]+\\'" string))) |
305 | ||
813f532d RS |
306 | ;;; Evaluation |
307 | ||
e848854a RS |
308 | (defun ielm-eval-input (ielm-string) |
309 | "Evaluate the Lisp expression IELM-STRING, and pretty-print the result." | |
813f532d | 310 | ;; This is the function that actually `sends' the input to the |
e848854a | 311 | ;; `inferior Lisp process'. All comint-send-input does is works out |
813f532d RS |
312 | ;; what that input is. What this function does is evaluates that |
313 | ;; input and produces `output' which gets inserted into the buffer, | |
314 | ;; along with a new prompt. A better way of doing this might have | |
315 | ;; been to actually send the output to the `cat' process, and write | |
316 | ;; this as in output filter that converted sexps in the output | |
317 | ;; stream to their evaluated value. But that would have involved | |
318 | ;; more process coordination than I was happy to deal with. | |
e848854a RS |
319 | ;; |
320 | ;; NOTE: all temporary variables in this function will be in scope | |
321 | ;; during the eval, and so need to have non-clashing names. | |
322 | (let (ielm-form ; form to evaluate | |
323 | ielm-pos ; End posn of parse in string | |
324 | ielm-result ; Result, or error message | |
325 | ielm-error-type ; string, nil if no error | |
326 | (ielm-output "") ; result to display | |
327 | (ielm-wbuf ielm-working-buffer) ; current buffer after evaluation | |
328 | (ielm-pmark (ielm-pm))) | |
329 | (if (not (ielm-is-whitespace ielm-string)) | |
813f532d RS |
330 | (progn |
331 | (condition-case err | |
332 | (let (rout) | |
e848854a RS |
333 | (setq rout (read-from-string ielm-string)) |
334 | (setq ielm-form (car rout)) | |
335 | (setq ielm-pos (cdr rout))) | |
568bbe5e | 336 | (error (setq ielm-result (error-message-string err)) |
e848854a RS |
337 | (setq ielm-error-type "Read error"))) |
338 | (if ielm-error-type nil | |
339 | ;; Make sure working buffer has not been killed | |
340 | (if (not (buffer-name ielm-working-buffer)) | |
341 | (setq ielm-result "Working buffer has been killed" | |
342 | ielm-error-type "IELM Error" | |
343 | ielm-wbuf (current-buffer)) | |
344 | (if (ielm-is-whitespace (substring ielm-string ielm-pos)) | |
5d9655bb RS |
345 | ;; To correctly handle the ielm-local variables *, |
346 | ;; ** and ***, we need a temporary buffer to be | |
347 | ;; current at entry to the inner of the next two let | |
348 | ;; forms. We need another temporary buffer to exit | |
349 | ;; that same let. To avoid problems, neither of | |
350 | ;; these buffers should be alive during the | |
351 | ;; evaluation of ielm-form. | |
352 | (let ((*1 *) | |
353 | (*2 **) | |
354 | (*3 ***) | |
355 | ielm-temp-buffer) | |
565f89ec | 356 | (set-match-data ielm-match-data) |
e848854a | 357 | (save-excursion |
5d9655bb RS |
358 | (with-temp-buffer |
359 | (condition-case err | |
360 | (unwind-protect | |
361 | ;; The next let form creates default | |
362 | ;; bindings for *, ** and ***. But | |
363 | ;; these default bindings are | |
364 | ;; identical to the ielm-local | |
365 | ;; bindings. Hence, during the | |
366 | ;; evaluation of ielm-form, the | |
367 | ;; ielm-local values are going to be | |
368 | ;; used in all buffers except for | |
369 | ;; other ielm buffers, which override | |
370 | ;; them. Normally, the variables *1, | |
371 | ;; *2 and *3 also have default | |
372 | ;; bindings, which are not overridden. | |
373 | (let ((* *1) | |
374 | (** *2) | |
375 | (*** *3)) | |
376 | (kill-buffer (current-buffer)) | |
377 | (set-buffer ielm-wbuf) | |
378 | (setq ielm-result (eval ielm-form)) | |
379 | (setq ielm-wbuf (current-buffer)) | |
380 | (setq | |
381 | ielm-temp-buffer | |
382 | (generate-new-buffer " *ielm-temp*")) | |
383 | (set-buffer ielm-temp-buffer)) | |
384 | (when ielm-temp-buffer | |
385 | (kill-buffer ielm-temp-buffer))) | |
5967d963 | 386 | (error (setq ielm-result (error-message-string err)) |
5d9655bb RS |
387 | (setq ielm-error-type "Eval error")) |
388 | (quit (setq ielm-result "Quit during evaluation") | |
389 | (setq ielm-error-type "Eval error"))))) | |
565f89ec | 390 | (setq ielm-match-data (match-data))) |
e848854a RS |
391 | (setq ielm-error-type "IELM error") |
392 | (setq ielm-result "More than one sexp in input")))) | |
813f532d RS |
393 | |
394 | ;; If the eval changed the current buffer, mention it here | |
e848854a RS |
395 | (if (eq ielm-wbuf ielm-working-buffer) nil |
396 | (message "current buffer is now: %s" ielm-wbuf) | |
397 | (setq ielm-working-buffer ielm-wbuf)) | |
813f532d | 398 | |
e848854a RS |
399 | (goto-char ielm-pmark) |
400 | (if (not ielm-error-type) | |
813f532d RS |
401 | (condition-case err |
402 | ;; Self-referential objects cause loops in the printer, so | |
403 | ;; trap quits here. May as well do errors, too | |
e848854a RS |
404 | (setq ielm-output (concat ielm-output (pp-to-string ielm-result))) |
405 | (error (setq ielm-error-type "IELM Error") | |
406 | (setq ielm-result "Error during pretty-printing (bug in pp)")) | |
407 | (quit (setq ielm-error-type "IELM Error") | |
408 | (setq ielm-result "Quit during pretty-printing")))) | |
409 | (if ielm-error-type | |
813f532d RS |
410 | (progn |
411 | (if ielm-noisy (ding)) | |
e848854a RS |
412 | (setq ielm-output (concat ielm-output "*** " ielm-error-type " *** ")) |
413 | (setq ielm-output (concat ielm-output ielm-result))) | |
d38e7d5f | 414 | ;; There was no error, so shift the *** values |
71d54f88 RS |
415 | (setq *** **) |
416 | (setq ** *) | |
417 | (setq * ielm-result)) | |
e848854a | 418 | (setq ielm-output (concat ielm-output "\n")))) |
016b8f71 | 419 | (setq ielm-output (concat ielm-output ielm-prompt-internal)) |
e848854a | 420 | (comint-output-filter (ielm-process) ielm-output))) |
813f532d RS |
421 | |
422 | ;;; Process and marker utilities | |
423 | ||
424 | (defun ielm-process nil | |
e848854a | 425 | ;; Return the current buffer's process. |
813f532d RS |
426 | (get-buffer-process (current-buffer))) |
427 | ||
428 | (defun ielm-pm nil | |
e848854a | 429 | ;; Return the process mark of the current buffer. |
813f532d RS |
430 | (process-mark (get-buffer-process (current-buffer)))) |
431 | ||
432 | (defun ielm-set-pm (pos) | |
e848854a | 433 | ;; Set the process mark in the current buffer to POS. |
813f532d RS |
434 | (set-marker (process-mark (get-buffer-process (current-buffer))) pos)) |
435 | ||
436 | ;;; Major mode | |
437 | ||
95b20f3b RS |
438 | (put 'inferior-emacs-lisp-mode 'mode-class 'special) |
439 | ||
813f532d | 440 | (defun inferior-emacs-lisp-mode nil |
e848854a RS |
441 | "Major mode for interactively evaluating Emacs Lisp expressions. |
442 | Uses the interface provided by `comint-mode' (which see). | |
443 | ||
66f06793 SM |
444 | * \\<ielm-map>\\[ielm-send-input] evaluates the sexp following the prompt. There must be at most |
445 | one top level sexp per prompt. | |
813f532d | 446 | |
e848854a RS |
447 | * \\[ielm-return] inserts a newline and indents, or evaluates a |
448 | complete expression (but see variable `ielm-dynamic-return'). | |
449 | Inputs longer than one line are moved to the line following the | |
450 | prompt (but see variable `ielm-dynamic-multiline-inputs'). | |
451 | ||
690ec649 | 452 | * \\[comint-dynamic-complete] completes Lisp symbols (or filenames, within strings), |
e848854a | 453 | or indents the line if there is nothing to complete. |
813f532d | 454 | |
e848854a RS |
455 | The current working buffer may be changed (with a call to |
456 | `set-buffer', or with \\[ielm-change-working-buffer]), and its value | |
457 | is preserved between successive evaluations. In this way, expressions | |
458 | may be evaluated in a different buffer than the *ielm* buffer. | |
76364803 JB |
459 | By default, its name is shown on the mode line; you can always display |
460 | it with \\[ielm-print-working-buffer], or the buffer itself with \\[ielm-display-working-buffer]. | |
813f532d | 461 | |
5d9655bb RS |
462 | During evaluations, the values of the variables `*', `**', and `***' |
463 | are the results of the previous, second previous and third previous | |
464 | evaluations respectively. If the working buffer is another IELM | |
465 | buffer, then the values in the working buffer are used. The variables | |
466 | `*1', `*2' and `*3', yield the process buffer values. | |
467 | ||
e848854a RS |
468 | Expressions evaluated by IELM are not subject to `debug-on-quit' or |
469 | `debug-on-error'. | |
813f532d | 470 | |
291cfc0c | 471 | The behavior of IELM may be customized with the following variables: |
0382cf8f | 472 | * To stop beeping on error, set `ielm-noisy' to nil. |
813f532d | 473 | * If you don't like the prompt, you can change it by setting `ielm-prompt'. |
759f960a LT |
474 | * If you do not like that the prompt is (by default) read-only, set |
475 | `ielm-prompt-read-only' to nil. | |
0382cf8f | 476 | * Set `ielm-dynamic-return' to nil for bindings like `lisp-interaction-mode'. |
813f532d RS |
477 | * Entry to this mode runs `comint-mode-hook' and `ielm-mode-hook' |
478 | (in that order). | |
479 | ||
0382cf8f | 480 | Customized bindings may be defined in `ielm-map', which currently contains: |
813f532d RS |
481 | \\{ielm-map}" |
482 | (interactive) | |
9c5e65b2 LT |
483 | (delay-mode-hooks |
484 | (comint-mode)) | |
813f532d | 485 | (setq comint-prompt-regexp (concat "^" (regexp-quote ielm-prompt))) |
85ab9f4e | 486 | (set (make-local-variable 'paragraph-separate) "\\'") |
813f532d RS |
487 | (make-local-variable 'paragraph-start) |
488 | (setq paragraph-start comint-prompt-regexp) | |
489 | (setq comint-input-sender 'ielm-input-sender) | |
490 | (setq comint-process-echoes nil) | |
27cfbf4b | 491 | (make-local-variable 'comint-dynamic-complete-functions) |
016b8f71 LT |
492 | (set (make-local-variable 'ielm-prompt-internal) ielm-prompt) |
493 | (set (make-local-variable 'comint-prompt-read-only) ielm-prompt-read-only) | |
690ec649 | 494 | (setq comint-dynamic-complete-functions |
813f532d | 495 | '(ielm-tab comint-replace-by-expanded-history ielm-complete-filename ielm-complete-symbol)) |
e848854a | 496 | (setq comint-get-old-input 'ielm-get-old-input) |
34ce46c8 | 497 | (make-local-variable 'comint-completion-addsuffix) |
016b8f71 | 498 | (setq comint-completion-addsuffix '("/" . "")) |
813f532d RS |
499 | (setq major-mode 'inferior-emacs-lisp-mode) |
500 | (setq mode-name "IELM") | |
76364803 | 501 | (setq mode-line-process '(":%s on " (:eval (buffer-name ielm-working-buffer)))) |
813f532d RS |
502 | (use-local-map ielm-map) |
503 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
504 | ||
505 | (make-local-variable 'indent-line-function) | |
506 | (make-local-variable 'ielm-working-buffer) | |
507 | (setq ielm-working-buffer (current-buffer)) | |
508 | (setq indent-line-function 'ielm-indent-line) | |
950086e6 KH |
509 | (make-local-variable 'fill-paragraph-function) |
510 | (setq fill-paragraph-function 'lisp-fill-paragraph) | |
813f532d | 511 | |
e848854a | 512 | ;; Value holders |
fed9da13 | 513 | (make-local-variable '*) |
5d9655bb | 514 | (setq * nil) |
fed9da13 | 515 | (make-local-variable '**) |
5d9655bb | 516 | (setq ** nil) |
fed9da13 | 517 | (make-local-variable '***) |
5d9655bb | 518 | (setq *** nil) |
565f89ec | 519 | (set (make-local-variable 'ielm-match-data) nil) |
813f532d | 520 | |
9d42eea3 RS |
521 | ;; font-lock support |
522 | (make-local-variable 'font-lock-defaults) | |
690ec649 | 523 | (setq font-lock-defaults |
9d42eea3 | 524 | '(ielm-font-lock-keywords nil nil ((?: . "w") (?- . "w") (?* . "w")))) |
690ec649 | 525 | |
813f532d | 526 | ;; A dummy process to keep comint happy. It will never get any input |
20b13009 | 527 | (unless (comint-check-proc (current-buffer)) |
33a65176 JR |
528 | ;; Was cat, but on non-Unix platforms that might not exist, so |
529 | ;; use hexl instead, which is part of the Emacs distribution. | |
66f06793 SM |
530 | (condition-case nil |
531 | (start-process "ielm" (current-buffer) "hexl") | |
532 | (file-error (start-process "ielm" (current-buffer) "cat"))) | |
e5927b52 | 533 | (set-process-query-on-exit-flag (ielm-process) nil) |
813f532d | 534 | (goto-char (point-max)) |
71296446 | 535 | |
20b13009 MB |
536 | ;; Lisp output can include raw characters that confuse comint's |
537 | ;; carriage control code. | |
538 | (set (make-local-variable 'comint-inhibit-carriage-motion) t) | |
539 | ||
813f532d RS |
540 | ;; Add a silly header |
541 | (insert ielm-header) | |
542 | (ielm-set-pm (point-max)) | |
85ab9f4e | 543 | (unless comint-use-prompt-regexp |
76364803 JB |
544 | (let ((inhibit-read-only t)) |
545 | (add-text-properties | |
546 | (point-min) (point-max) | |
547 | '(rear-nonsticky t field output inhibit-line-move-field-capture t)))) | |
016b8f71 | 548 | (comint-output-filter (ielm-process) ielm-prompt-internal) |
813f532d RS |
549 | (set-marker comint-last-input-start (ielm-pm)) |
550 | (set-process-filter (get-buffer-process (current-buffer)) 'comint-output-filter)) | |
20b13009 | 551 | |
d395b3b5 | 552 | (run-mode-hooks 'ielm-mode-hook)) |
813f532d | 553 | |
e848854a RS |
554 | (defun ielm-get-old-input nil |
555 | ;; Return the previous input surrounding point | |
556 | (save-excursion | |
557 | (beginning-of-line) | |
558 | (if (looking-at comint-prompt-regexp) nil | |
559 | (re-search-backward comint-prompt-regexp)) | |
560 | (comint-skip-prompt) | |
561 | (buffer-substring (point) (progn (forward-sexp 1) (point))))) | |
562 | ||
813f532d RS |
563 | ;;; User command |
564 | ||
9e983c78 RS |
565 | ;;;###autoload (add-hook 'same-window-buffer-names "*ielm*") |
566 | ||
e848854a | 567 | ;;;###autoload |
813f532d | 568 | (defun ielm nil |
e848854a | 569 | "Interactively evaluate Emacs Lisp expressions. |
9e983c78 | 570 | Switches to the buffer `*ielm*', or creates it if it does not exist." |
813f532d | 571 | (interactive) |
ee9cd72d LT |
572 | (let (old-point) |
573 | (unless (comint-check-proc "*ielm*") | |
574 | (with-current-buffer (get-buffer-create "*ielm*") | |
016b8f71 | 575 | (unless (zerop (buffer-size)) (setq old-point (point))) |
ee9cd72d LT |
576 | (inferior-emacs-lisp-mode))) |
577 | (pop-to-buffer "*ielm*") | |
578 | (when old-point (push-mark old-point)))) | |
813f532d | 579 | |
896546cd RS |
580 | (provide 'ielm) |
581 | ||
ab5796a9 | 582 | ;;; arch-tag: ef60e4c0-9c4f-4bdb-8402-271313329790 |
e848854a | 583 | ;;; ielm.el ends here |