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813f532d | 1 | ;;; ielm.el --- interaction mode for Emacs Lisp |
b578f267 | 2 | |
813f532d RS |
3 | ;; Copyright (C) 1994 Free Software Foundation, Inc. |
4 | ||
5 | ;; Author: David Smith <maa036@lancaster.ac.uk> | |
6 | ;; Created: 25 Feb 1994 | |
7 | ;; Keywords: lisp | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
813f532d RS |
25 | |
26 | ;;; Commentary: | |
27 | ||
e848854a | 28 | ;; Provides a nice interface to evaluating Emacs Lisp expressions. |
813f532d RS |
29 | ;; Input is handled by the comint package, and output is passed |
30 | ;; through the pretty-printer. | |
31 | ||
32 | ;; To install: copy this file to a directory in your load-path, and | |
e848854a | 33 | ;; add the following line to your .emacs file: |
813f532d | 34 | ;; |
e848854a | 35 | ;; (autoload 'ielm "ielm" "Start an inferior Emacs Lisp session" t) |
813f532d RS |
36 | ;; |
37 | ;; For completion to work, the comint.el from FSF Emacs 19.23 is | |
38 | ;; required. If you do not have it, or if you are running Lemacs, | |
39 | ;; also add the following code to your .emacs: | |
40 | ;; | |
41 | ;; (setq ielm-mode-hook | |
42 | ;; '(lambda nil | |
43 | ;; (define-key ielm-map "\t" | |
44 | ;; '(lambda nil (interactive) (or (ielm-tab) | |
45 | ;; (lisp-complete-symbol)))))) | |
46 | ||
47 | ;; To start: M-x ielm. Type C-h m in the *ielm* buffer for more info. | |
48 | ||
49 | ;; The latest version is available by WWW from | |
50 | ;; http://mathssun5.lancs.ac.uk:2080/~maa036/elisp/dir.html | |
51 | ;; or by anonymous FTP from | |
52 | ;; /anonymous@wingra.stat.wisc.edu:pub/src/emacs-lisp/ielm.el.gz | |
53 | ;; or from the author: David M. Smith <maa036@lancaster.ac.uk> | |
54 | ||
55 | ;;; Code: | |
56 | ||
57 | (require 'comint) | |
58 | (require 'pp) | |
59 | ||
60 | ;;; User variables | |
61 | ||
62 | (defvar ielm-noisy t | |
e848854a | 63 | "*If non-nil, IELM will beep on error.") |
813f532d | 64 | |
e848854a RS |
65 | (defvar ielm-prompt "ELISP> " |
66 | "Prompt used in IELM.") | |
813f532d RS |
67 | |
68 | (defvar ielm-dynamic-return t | |
e848854a RS |
69 | "*Controls whether \\<ielm-map>\\[ielm-return] has intelligent behaviour in IELM. |
70 | If non-nil, \\[ielm-return] evaluates input for complete sexps, or inserts a newline | |
71 | and indents for incomplete sexps. If nil, always inserts newlines.") | |
72 | ||
73 | (defvar ielm-dynamic-multiline-inputs t | |
74 | "*Force multiline inputs to start from column zero? | |
75 | If non-nil, after entering the first line of an incomplete sexp, a newline | |
76 | will be inserted after the prompt, moving the input to the next line. | |
77 | This gives more frame width for large indented sexps, and allows functions | |
78 | such as `edebug-defun' to work with such inputs.") | |
813f532d RS |
79 | |
80 | (defvar ielm-mode-hook nil | |
e848854a | 81 | "*Hooks to be run when IELM (`inferior-emacs-lisp-mode') is started.") |
813f532d RS |
82 | |
83 | ;;; System variables | |
84 | ||
85 | (defvar ielm-working-buffer nil | |
e848854a RS |
86 | "Buffer in which IELM sexps will be evaluated. |
87 | This variable is buffer-local.") | |
813f532d RS |
88 | |
89 | (defvar ielm-header | |
90 | (concat | |
e848854a | 91 | "*** Welcome to IELM version " |
950086e6 | 92 | (substring "$Revision: 1.7 $" 11 -2) |
813f532d | 93 | " *** Type (describe-mode) for help.\n" |
e848854a RS |
94 | "IELM has ABSOLUTELY NO WARRANTY; type (describe-no-warranty) for details.\n") |
95 | "Message to display when IELM is started.") | |
813f532d RS |
96 | |
97 | (defvar ielm-map nil) | |
98 | (if ielm-map nil | |
99 | (if (string-match "Lucid" emacs-version) | |
100 | ;; Lemacs | |
101 | (progn | |
102 | (setq ielm-map (make-sparse-keymap)) | |
103 | (set-keymap-parent ielm-map comint-mode-map)) | |
104 | ;; FSF | |
105 | (setq ielm-map (cons 'keymap comint-mode-map))) | |
106 | (define-key ielm-map "\t" 'comint-dynamic-complete) | |
107 | (define-key ielm-map "\C-m" 'ielm-return) | |
e848854a RS |
108 | (define-key ielm-map "\C-j" 'ielm-send-input) |
109 | (define-key ielm-map "\e\C-x" 'eval-defun) ; for consistency with | |
110 | (define-key ielm-map "\e\t" 'lisp-complete-symbol) ; lisp-interaction-mode | |
111 | ;; These bindings are from shared-lisp-mode-map -- can you inherit | |
112 | ;; from more than one keymap?? | |
113 | (define-key ielm-map "\e\C-q" 'indent-sexp) | |
e848854a RS |
114 | (define-key ielm-map "\177" 'backward-delete-char-untabify) |
115 | ;; Some convenience bindings for setting the working buffer | |
116 | (define-key ielm-map "\C-c\C-b" 'ielm-change-working-buffer) | |
117 | (define-key ielm-map "\C-c\C-f" 'ielm-display-working-buffer) | |
118 | (define-key ielm-map "\C-c\C-v" 'ielm-print-working-buffer)) | |
813f532d | 119 | |
9d42eea3 RS |
120 | (defvar ielm-font-lock-keywords |
121 | (list | |
122 | (cons (concat "^" (regexp-quote ielm-prompt)) 'font-lock-keyword-face) | |
123 | '("\\(^\\*\\*\\*[^*]+\\*\\*\\*\\)\\(.*$\\)" (1 font-lock-comment-face) (2 font-lock-reference-face))) | |
124 | "Additional expressions to highlight in ielm buffers.") | |
125 | ||
813f532d RS |
126 | ;;; Completion stuff |
127 | ||
128 | (defun ielm-tab nil | |
e848854a | 129 | "Possibly indent the current line as lisp code." |
813f532d RS |
130 | (interactive) |
131 | (if (or (eq (preceding-char) ?\n) | |
132 | (eq (char-syntax (preceding-char)) ? )) | |
133 | (progn | |
134 | (ielm-indent-line) | |
135 | t))) | |
136 | ||
137 | (defun ielm-complete-symbol nil | |
e848854a RS |
138 | "Complete the lisp symbol before point." |
139 | ;; A wrapper for lisp-complete symbol that returns non-nil if | |
140 | ;; completion has occurred | |
813f532d | 141 | (let* ((btick (buffer-modified-tick)) |
e58df0dc | 142 | (cbuffer (get-buffer "*Completions*")) |
813f532d RS |
143 | (ctick (and cbuffer (buffer-modified-tick cbuffer)))) |
144 | (lisp-complete-symbol) | |
145 | ;; completion has occurred if: | |
146 | (or | |
147 | ;; the buffer has been modified | |
148 | (not (= btick (buffer-modified-tick))) | |
a7acbbe4 | 149 | ;; a completions buffer has been modified or created |
813f532d RS |
150 | (if cbuffer |
151 | (not (= ctick (buffer-modified-tick cbuffer))) | |
e58df0dc | 152 | (get-buffer "*Completions*"))))) |
813f532d RS |
153 | |
154 | (defun ielm-complete-filename nil | |
e848854a | 155 | "Dynamically complete filename before point, if in a string." |
813f532d RS |
156 | (if (nth 3 (parse-partial-sexp comint-last-input-start (point))) |
157 | (comint-dynamic-complete-filename))) | |
158 | ||
159 | (defun ielm-indent-line nil | |
e848854a | 160 | "Indent the current line as Lisp code if it is not a prompt line." |
813f532d RS |
161 | (if (save-excursion |
162 | (beginning-of-line) | |
163 | (looking-at comint-prompt-regexp)) nil | |
164 | (lisp-indent-line))) | |
165 | ||
e848854a RS |
166 | ;;; Working buffer manipulation |
167 | ||
168 | (defun ielm-print-working-buffer nil | |
169 | "Print the current IELM working buffer's name in the echo area." | |
170 | (interactive) | |
171 | (message "The current working buffer is: %s" (buffer-name ielm-working-buffer))) | |
172 | ||
173 | (defun ielm-display-working-buffer nil | |
174 | "Display the current IELM working buffer. | |
175 | Don't forget that selecting that buffer will change its value of `point' | |
176 | to its value of `window-point'!" | |
177 | (interactive) | |
178 | (display-buffer ielm-working-buffer) | |
179 | (ielm-print-working-buffer)) | |
180 | ||
181 | (defun ielm-change-working-buffer (buf) | |
182 | "Change the current IELM working buffer to BUF. | |
183 | This is the buffer in which all sexps entered at the IELM prompt are | |
184 | evaluated. You can achieve the same effect with a call to | |
185 | `set-buffer' at the IELM prompt." | |
186 | (interactive "bSet working buffer to: ") | |
187 | (setq ielm-working-buffer (or (get-buffer buf) (error "No such buffer"))) | |
188 | (ielm-print-working-buffer)) | |
189 | ||
813f532d RS |
190 | ;;; Other bindings |
191 | ||
192 | (defun ielm-return nil | |
e848854a RS |
193 | "Newline and indent, or evaluate the sexp before the prompt. |
194 | Complete sexps are evaluated; for incomplete sexps inserts a newline | |
195 | and indents. If however `ielm-dynamic-return' is nil, this always | |
196 | simply inserts a newline." | |
813f532d RS |
197 | (interactive) |
198 | (if ielm-dynamic-return | |
199 | (let ((state | |
200 | (save-excursion | |
201 | (end-of-line) | |
202 | (parse-partial-sexp (ielm-pm) | |
203 | (point))))) | |
204 | (if (and (< (car state) 1) (not (nth 3 state))) | |
205 | (ielm-send-input) | |
e848854a RS |
206 | (if (and ielm-dynamic-multiline-inputs |
207 | (save-excursion | |
208 | (beginning-of-line) | |
209 | (looking-at comint-prompt-regexp))) | |
210 | (save-excursion | |
211 | (goto-char (ielm-pm)) | |
212 | (newline 1))) | |
813f532d RS |
213 | (newline-and-indent))) |
214 | (newline))) | |
215 | ||
216 | (defun ielm-input-sender (proc input) | |
e848854a RS |
217 | ;; Just sets the variable ielm-input, which is in the scope of |
218 | ;; `ielm-send-input's call. | |
813f532d RS |
219 | (setq ielm-input input)) |
220 | ||
221 | (defun ielm-send-input nil | |
e848854a | 222 | "Evaluate the Emacs Lisp expression after the prompt." |
813f532d RS |
223 | (interactive) |
224 | (let ((buf (current-buffer)) | |
225 | ielm-input) ; set by ielm-input-sender | |
226 | (comint-send-input) ; update history, markers etc. | |
227 | (ielm-eval-input ielm-input))) | |
228 | ||
229 | ;;; Utility functions | |
230 | ||
231 | (defun ielm-is-whitespace (string) | |
e848854a | 232 | "Return non-nil if STRING is all whitespace." |
813f532d RS |
233 | (or (string= string "") (string-match "\\`[ \t\n]+\\'" string))) |
234 | ||
235 | (defun ielm-format-errors (errlist) | |
236 | (let ((result "")) | |
237 | (while errlist | |
238 | (setq result (concat result (prin1-to-string (car errlist)) ", ")) | |
239 | (setq errlist (cdr errlist))) | |
240 | (substring result 0 -2))) | |
241 | ||
242 | ||
243 | (defun ielm-format-error (err) | |
e848854a | 244 | ;; Return a string form of the error ERR. |
813f532d RS |
245 | (format "%s%s" |
246 | (or (get (car err) 'error-message) "Peculiar error") | |
247 | (if (cdr err) | |
248 | (format ": %s" (ielm-format-errors (cdr err))) | |
249 | ""))) | |
250 | ||
251 | ;;; Evaluation | |
252 | ||
e848854a RS |
253 | (defun ielm-eval-input (ielm-string) |
254 | "Evaluate the Lisp expression IELM-STRING, and pretty-print the result." | |
813f532d | 255 | ;; This is the function that actually `sends' the input to the |
e848854a | 256 | ;; `inferior Lisp process'. All comint-send-input does is works out |
813f532d RS |
257 | ;; what that input is. What this function does is evaluates that |
258 | ;; input and produces `output' which gets inserted into the buffer, | |
259 | ;; along with a new prompt. A better way of doing this might have | |
260 | ;; been to actually send the output to the `cat' process, and write | |
261 | ;; this as in output filter that converted sexps in the output | |
262 | ;; stream to their evaluated value. But that would have involved | |
263 | ;; more process coordination than I was happy to deal with. | |
e848854a RS |
264 | ;; |
265 | ;; NOTE: all temporary variables in this function will be in scope | |
266 | ;; during the eval, and so need to have non-clashing names. | |
267 | (let (ielm-form ; form to evaluate | |
268 | ielm-pos ; End posn of parse in string | |
269 | ielm-result ; Result, or error message | |
270 | ielm-error-type ; string, nil if no error | |
271 | (ielm-output "") ; result to display | |
272 | (ielm-wbuf ielm-working-buffer) ; current buffer after evaluation | |
273 | (ielm-pmark (ielm-pm))) | |
274 | (if (not (ielm-is-whitespace ielm-string)) | |
813f532d RS |
275 | (progn |
276 | (condition-case err | |
277 | (let (rout) | |
e848854a RS |
278 | (setq rout (read-from-string ielm-string)) |
279 | (setq ielm-form (car rout)) | |
280 | (setq ielm-pos (cdr rout))) | |
281 | (error (setq ielm-result (ielm-format-error err)) | |
282 | (setq ielm-error-type "Read error"))) | |
283 | (if ielm-error-type nil | |
284 | ;; Make sure working buffer has not been killed | |
285 | (if (not (buffer-name ielm-working-buffer)) | |
286 | (setq ielm-result "Working buffer has been killed" | |
287 | ielm-error-type "IELM Error" | |
288 | ielm-wbuf (current-buffer)) | |
289 | (if (ielm-is-whitespace (substring ielm-string ielm-pos)) | |
290 | ;; need this awful let convolution to work around | |
291 | ;; an Emacs bug involving local vbls and let binding | |
292 | (let ((:save :) | |
293 | (::save ::) | |
294 | (:::save :::)) | |
295 | (save-excursion | |
296 | (set-buffer ielm-working-buffer) | |
297 | (condition-case err | |
298 | (let ((: :save) | |
299 | (:: ::save) | |
300 | (::: :::save) | |
301 | (ielm-obuf (current-buffer))) | |
302 | (setq ielm-result (eval ielm-form)) | |
303 | (setq ielm-wbuf (current-buffer)) | |
304 | ;; The eval may have changed current-buffer; | |
305 | ;; need to set it back here to avoid a bug | |
306 | ;; in let. Don't want to use save-excursion | |
307 | ;; because we want to allow changes in point. | |
308 | (set-buffer ielm-obuf)) | |
309 | (error (setq ielm-result (ielm-format-error err)) | |
310 | (setq ielm-error-type "Eval error")) | |
311 | (quit (setq ielm-result "Quit during evaluation") | |
312 | (setq ielm-error-type "Eval error"))))) | |
313 | (setq ielm-error-type "IELM error") | |
314 | (setq ielm-result "More than one sexp in input")))) | |
813f532d RS |
315 | |
316 | ;; If the eval changed the current buffer, mention it here | |
e848854a RS |
317 | (if (eq ielm-wbuf ielm-working-buffer) nil |
318 | (message "current buffer is now: %s" ielm-wbuf) | |
319 | (setq ielm-working-buffer ielm-wbuf)) | |
813f532d | 320 | |
e848854a RS |
321 | (goto-char ielm-pmark) |
322 | (if (not ielm-error-type) | |
813f532d RS |
323 | (condition-case err |
324 | ;; Self-referential objects cause loops in the printer, so | |
325 | ;; trap quits here. May as well do errors, too | |
e848854a RS |
326 | (setq ielm-output (concat ielm-output (pp-to-string ielm-result))) |
327 | (error (setq ielm-error-type "IELM Error") | |
328 | (setq ielm-result "Error during pretty-printing (bug in pp)")) | |
329 | (quit (setq ielm-error-type "IELM Error") | |
330 | (setq ielm-result "Quit during pretty-printing")))) | |
331 | (if ielm-error-type | |
813f532d RS |
332 | (progn |
333 | (if ielm-noisy (ding)) | |
e848854a RS |
334 | (setq ielm-output (concat ielm-output "*** " ielm-error-type " *** ")) |
335 | (setq ielm-output (concat ielm-output ielm-result))) | |
813f532d RS |
336 | ;; There was no error, so shift the ::: values |
337 | (setq ::: ::) | |
338 | (setq :: :) | |
e848854a RS |
339 | (setq : ielm-result)) |
340 | (setq ielm-output (concat ielm-output "\n")))) | |
341 | (setq ielm-output (concat ielm-output ielm-prompt)) | |
342 | (comint-output-filter (ielm-process) ielm-output))) | |
813f532d RS |
343 | |
344 | ;;; Process and marker utilities | |
345 | ||
346 | (defun ielm-process nil | |
e848854a | 347 | ;; Return the current buffer's process. |
813f532d RS |
348 | (get-buffer-process (current-buffer))) |
349 | ||
350 | (defun ielm-pm nil | |
e848854a | 351 | ;; Return the process mark of the current buffer. |
813f532d RS |
352 | (process-mark (get-buffer-process (current-buffer)))) |
353 | ||
354 | (defun ielm-set-pm (pos) | |
e848854a | 355 | ;; Set the process mark in the current buffer to POS. |
813f532d RS |
356 | (set-marker (process-mark (get-buffer-process (current-buffer))) pos)) |
357 | ||
358 | ;;; Major mode | |
359 | ||
360 | (defun inferior-emacs-lisp-mode nil | |
e848854a RS |
361 | "Major mode for interactively evaluating Emacs Lisp expressions. |
362 | Uses the interface provided by `comint-mode' (which see). | |
363 | ||
364 | * \\<ielm-map>\\[ielm-send-input] evaluates the sexp following the prompt. There must be at most | |
365 | one top-level sexp per prompt. | |
813f532d | 366 | |
e848854a RS |
367 | * \\[ielm-return] inserts a newline and indents, or evaluates a |
368 | complete expression (but see variable `ielm-dynamic-return'). | |
369 | Inputs longer than one line are moved to the line following the | |
370 | prompt (but see variable `ielm-dynamic-multiline-inputs'). | |
371 | ||
372 | * \\[comint-dynamic-complete] completes Lisp symbols (or filenames, within strings), | |
373 | or indents the line if there is nothing to complete. | |
813f532d RS |
374 | |
375 | During evaluations, the values of the variables `:', `::', and `:::' | |
376 | are the results of the previous, second previous and third previous | |
377 | evaluations respectively. | |
378 | ||
e848854a RS |
379 | The current working buffer may be changed (with a call to |
380 | `set-buffer', or with \\[ielm-change-working-buffer]), and its value | |
381 | is preserved between successive evaluations. In this way, expressions | |
382 | may be evaluated in a different buffer than the *ielm* buffer. | |
383 | Display the name of the working buffer with \\[ielm-print-working-buffer], | |
384 | or the buffer itself with \\[ielm-display-working-buffer]. | |
813f532d | 385 | |
e848854a RS |
386 | Expressions evaluated by IELM are not subject to `debug-on-quit' or |
387 | `debug-on-error'. | |
813f532d RS |
388 | |
389 | The behaviour of IELM may be customised with the following variables: | |
390 | * To stop beeping on error, set `ielm-noisy' to nil | |
391 | * If you don't like the prompt, you can change it by setting `ielm-prompt'. | |
392 | * Set `ielm-dynamic-return' to nil for bindings like `lisp-interaction-mode' | |
393 | * Entry to this mode runs `comint-mode-hook' and `ielm-mode-hook' | |
394 | (in that order). | |
395 | ||
396 | Customised bindings may be defined in `ielm-map', which currently contains: | |
397 | \\{ielm-map}" | |
398 | (interactive) | |
399 | (comint-mode) | |
400 | (setq comint-prompt-regexp (concat "^" (regexp-quote ielm-prompt))) | |
401 | (make-local-variable 'paragraph-start) | |
402 | (setq paragraph-start comint-prompt-regexp) | |
403 | (setq comint-input-sender 'ielm-input-sender) | |
404 | (setq comint-process-echoes nil) | |
405 | (setq comint-dynamic-complete-functions | |
406 | '(ielm-tab comint-replace-by-expanded-history ielm-complete-filename ielm-complete-symbol)) | |
e848854a | 407 | (setq comint-get-old-input 'ielm-get-old-input) |
813f532d RS |
408 | |
409 | (setq major-mode 'inferior-emacs-lisp-mode) | |
410 | (setq mode-name "IELM") | |
411 | (use-local-map ielm-map) | |
412 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
413 | ||
414 | (make-local-variable 'indent-line-function) | |
415 | (make-local-variable 'ielm-working-buffer) | |
416 | (setq ielm-working-buffer (current-buffer)) | |
417 | (setq indent-line-function 'ielm-indent-line) | |
950086e6 KH |
418 | (make-local-variable 'fill-paragraph-function) |
419 | (setq fill-paragraph-function 'lisp-fill-paragraph) | |
813f532d | 420 | |
e848854a | 421 | ;; Value holders |
813f532d RS |
422 | (setq : nil) |
423 | (make-local-variable ':) | |
424 | (setq :: nil) | |
425 | (make-local-variable '::) | |
426 | (setq ::: nil) | |
427 | (make-local-variable ':::) | |
428 | ||
9d42eea3 RS |
429 | ;; font-lock support |
430 | (make-local-variable 'font-lock-defaults) | |
431 | (setq font-lock-defaults | |
432 | '(ielm-font-lock-keywords nil nil ((?: . "w") (?- . "w") (?* . "w")))) | |
433 | ||
813f532d RS |
434 | ;; A dummy process to keep comint happy. It will never get any input |
435 | (if (comint-check-proc (current-buffer)) nil | |
436 | (start-process "ielm" (current-buffer) "cat") | |
437 | (process-kill-without-query (ielm-process)) | |
438 | (goto-char (point-max)) | |
439 | ;; Add a silly header | |
440 | (insert ielm-header) | |
441 | (ielm-set-pm (point-max)) | |
442 | (comint-output-filter (ielm-process) ielm-prompt) | |
443 | (set-marker comint-last-input-start (ielm-pm)) | |
444 | (set-process-filter (get-buffer-process (current-buffer)) 'comint-output-filter)) | |
445 | (run-hooks 'ielm-mode-hook)) | |
446 | ||
e848854a RS |
447 | (defun ielm-get-old-input nil |
448 | ;; Return the previous input surrounding point | |
449 | (save-excursion | |
450 | (beginning-of-line) | |
451 | (if (looking-at comint-prompt-regexp) nil | |
452 | (re-search-backward comint-prompt-regexp)) | |
453 | (comint-skip-prompt) | |
454 | (buffer-substring (point) (progn (forward-sexp 1) (point))))) | |
455 | ||
813f532d RS |
456 | ;;; User command |
457 | ||
9e983c78 RS |
458 | ;;;###autoload (add-hook 'same-window-buffer-names "*ielm*") |
459 | ||
e848854a | 460 | ;;;###autoload |
813f532d | 461 | (defun ielm nil |
e848854a | 462 | "Interactively evaluate Emacs Lisp expressions. |
9e983c78 | 463 | Switches to the buffer `*ielm*', or creates it if it does not exist." |
813f532d | 464 | (interactive) |
9e983c78 RS |
465 | (if (comint-check-proc "*ielm*") |
466 | nil | |
467 | (save-excursion | |
813f532d RS |
468 | (set-buffer (get-buffer-create "*ielm*")) |
469 | (inferior-emacs-lisp-mode))) | |
9e983c78 | 470 | (pop-to-buffer "*ielm*")) |
813f532d | 471 | |
e848854a | 472 | ;;; ielm.el ends here |