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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> | |
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 | ||
813f532d RS |
113 | ;;; System variables |
114 | ||
115 | (defvar ielm-working-buffer nil | |
e848854a RS |
116 | "Buffer in which IELM sexps will be evaluated. |
117 | This variable is buffer-local.") | |
813f532d | 118 | |
690ec649 | 119 | (defvar ielm-header |
0a13146e | 120 | "*** Welcome to IELM *** Type (describe-mode) for help.\n" |
e848854a | 121 | "Message to display when IELM is started.") |
813f532d RS |
122 | |
123 | (defvar ielm-map nil) | |
124 | (if ielm-map nil | |
125 | (if (string-match "Lucid" emacs-version) | |
126 | ;; Lemacs | |
127 | (progn | |
128 | (setq ielm-map (make-sparse-keymap)) | |
129 | (set-keymap-parent ielm-map comint-mode-map)) | |
130 | ;; FSF | |
131 | (setq ielm-map (cons 'keymap comint-mode-map))) | |
132 | (define-key ielm-map "\t" 'comint-dynamic-complete) | |
133 | (define-key ielm-map "\C-m" 'ielm-return) | |
e848854a RS |
134 | (define-key ielm-map "\C-j" 'ielm-send-input) |
135 | (define-key ielm-map "\e\C-x" 'eval-defun) ; for consistency with | |
136 | (define-key ielm-map "\e\t" 'lisp-complete-symbol) ; lisp-interaction-mode | |
690ec649 | 137 | ;; These bindings are from `lisp-mode-shared-map' -- can you inherit |
e848854a | 138 | ;; from more than one keymap?? |
690ec649 | 139 | (define-key ielm-map "\e\C-q" 'indent-sexp) |
e848854a RS |
140 | (define-key ielm-map "\177" 'backward-delete-char-untabify) |
141 | ;; Some convenience bindings for setting the working buffer | |
142 | (define-key ielm-map "\C-c\C-b" 'ielm-change-working-buffer) | |
143 | (define-key ielm-map "\C-c\C-f" 'ielm-display-working-buffer) | |
144 | (define-key ielm-map "\C-c\C-v" 'ielm-print-working-buffer)) | |
813f532d | 145 | |
9d42eea3 | 146 | (defvar ielm-font-lock-keywords |
690ec649 | 147 | (list |
9d42eea3 | 148 | (cons (concat "^" (regexp-quote ielm-prompt)) 'font-lock-keyword-face) |
883212ce SM |
149 | '("\\(^\\*\\*\\*[^*]+\\*\\*\\*\\)\\(.*$\\)" |
150 | (1 font-lock-comment-face) | |
151 | (2 font-lock-constant-face))) | |
9d42eea3 | 152 | "Additional expressions to highlight in ielm buffers.") |
690ec649 | 153 | |
813f532d RS |
154 | ;;; Completion stuff |
155 | ||
156 | (defun ielm-tab nil | |
e848854a | 157 | "Possibly indent the current line as lisp code." |
813f532d RS |
158 | (interactive) |
159 | (if (or (eq (preceding-char) ?\n) | |
160 | (eq (char-syntax (preceding-char)) ? )) | |
161 | (progn | |
162 | (ielm-indent-line) | |
163 | t))) | |
690ec649 | 164 | |
813f532d | 165 | (defun ielm-complete-symbol nil |
e848854a RS |
166 | "Complete the lisp symbol before point." |
167 | ;; A wrapper for lisp-complete symbol that returns non-nil if | |
168 | ;; completion has occurred | |
813f532d | 169 | (let* ((btick (buffer-modified-tick)) |
e58df0dc | 170 | (cbuffer (get-buffer "*Completions*")) |
813f532d RS |
171 | (ctick (and cbuffer (buffer-modified-tick cbuffer)))) |
172 | (lisp-complete-symbol) | |
173 | ;; completion has occurred if: | |
690ec649 | 174 | (or |
813f532d | 175 | ;; the buffer has been modified |
690ec649 | 176 | (not (= btick (buffer-modified-tick))) |
a7acbbe4 | 177 | ;; a completions buffer has been modified or created |
813f532d RS |
178 | (if cbuffer |
179 | (not (= ctick (buffer-modified-tick cbuffer))) | |
e58df0dc | 180 | (get-buffer "*Completions*"))))) |
813f532d RS |
181 | |
182 | (defun ielm-complete-filename nil | |
e848854a | 183 | "Dynamically complete filename before point, if in a string." |
813f532d RS |
184 | (if (nth 3 (parse-partial-sexp comint-last-input-start (point))) |
185 | (comint-dynamic-complete-filename))) | |
690ec649 | 186 | |
813f532d | 187 | (defun ielm-indent-line nil |
e848854a | 188 | "Indent the current line as Lisp code if it is not a prompt line." |
3250010d | 189 | (when (save-excursion (comint-bol) (bolp)) |
813f532d RS |
190 | (lisp-indent-line))) |
191 | ||
e848854a RS |
192 | ;;; Working buffer manipulation |
193 | ||
194 | (defun ielm-print-working-buffer nil | |
195 | "Print the current IELM working buffer's name in the echo area." | |
196 | (interactive) | |
197 | (message "The current working buffer is: %s" (buffer-name ielm-working-buffer))) | |
198 | ||
199 | (defun ielm-display-working-buffer nil | |
200 | "Display the current IELM working buffer. | |
201 | Don't forget that selecting that buffer will change its value of `point' | |
202 | to its value of `window-point'!" | |
203 | (interactive) | |
204 | (display-buffer ielm-working-buffer) | |
205 | (ielm-print-working-buffer)) | |
206 | ||
207 | (defun ielm-change-working-buffer (buf) | |
208 | "Change the current IELM working buffer to BUF. | |
209 | This is the buffer in which all sexps entered at the IELM prompt are | |
210 | evaluated. You can achieve the same effect with a call to | |
211 | `set-buffer' at the IELM prompt." | |
212 | (interactive "bSet working buffer to: ") | |
213 | (setq ielm-working-buffer (or (get-buffer buf) (error "No such buffer"))) | |
214 | (ielm-print-working-buffer)) | |
215 | ||
813f532d RS |
216 | ;;; Other bindings |
217 | ||
218 | (defun ielm-return nil | |
e848854a RS |
219 | "Newline and indent, or evaluate the sexp before the prompt. |
220 | Complete sexps are evaluated; for incomplete sexps inserts a newline | |
221 | and indents. If however `ielm-dynamic-return' is nil, this always | |
222 | simply inserts a newline." | |
813f532d | 223 | (interactive) |
690ec649 SS |
224 | (if ielm-dynamic-return |
225 | (let ((state | |
813f532d RS |
226 | (save-excursion |
227 | (end-of-line) | |
228 | (parse-partial-sexp (ielm-pm) | |
229 | (point))))) | |
230 | (if (and (< (car state) 1) (not (nth 3 state))) | |
231 | (ielm-send-input) | |
e848854a RS |
232 | (if (and ielm-dynamic-multiline-inputs |
233 | (save-excursion | |
234 | (beginning-of-line) | |
235 | (looking-at comint-prompt-regexp))) | |
236 | (save-excursion | |
237 | (goto-char (ielm-pm)) | |
238 | (newline 1))) | |
813f532d RS |
239 | (newline-and-indent))) |
240 | (newline))) | |
241 | ||
94aba130 RS |
242 | (defvar ielm-input) |
243 | ||
813f532d | 244 | (defun ielm-input-sender (proc input) |
690ec649 | 245 | ;; Just sets the variable ielm-input, which is in the scope of |
e848854a | 246 | ;; `ielm-send-input's call. |
813f532d RS |
247 | (setq ielm-input input)) |
248 | ||
249 | (defun ielm-send-input nil | |
e848854a | 250 | "Evaluate the Emacs Lisp expression after the prompt." |
813f532d RS |
251 | (interactive) |
252 | (let ((buf (current-buffer)) | |
253 | ielm-input) ; set by ielm-input-sender | |
254 | (comint-send-input) ; update history, markers etc. | |
255 | (ielm-eval-input ielm-input))) | |
256 | ||
257 | ;;; Utility functions | |
258 | ||
259 | (defun ielm-is-whitespace (string) | |
e848854a | 260 | "Return non-nil if STRING is all whitespace." |
813f532d RS |
261 | (or (string= string "") (string-match "\\`[ \t\n]+\\'" string))) |
262 | ||
263 | (defun ielm-format-errors (errlist) | |
264 | (let ((result "")) | |
265 | (while errlist | |
266 | (setq result (concat result (prin1-to-string (car errlist)) ", ")) | |
267 | (setq errlist (cdr errlist))) | |
268 | (substring result 0 -2))) | |
269 | ||
270 | ||
271 | (defun ielm-format-error (err) | |
e848854a | 272 | ;; Return a string form of the error ERR. |
813f532d RS |
273 | (format "%s%s" |
274 | (or (get (car err) 'error-message) "Peculiar error") | |
275 | (if (cdr err) | |
276 | (format ": %s" (ielm-format-errors (cdr err))) | |
277 | ""))) | |
278 | ||
279 | ;;; Evaluation | |
280 | ||
e848854a RS |
281 | (defun ielm-eval-input (ielm-string) |
282 | "Evaluate the Lisp expression IELM-STRING, and pretty-print the result." | |
813f532d | 283 | ;; This is the function that actually `sends' the input to the |
e848854a | 284 | ;; `inferior Lisp process'. All comint-send-input does is works out |
813f532d RS |
285 | ;; what that input is. What this function does is evaluates that |
286 | ;; input and produces `output' which gets inserted into the buffer, | |
287 | ;; along with a new prompt. A better way of doing this might have | |
288 | ;; been to actually send the output to the `cat' process, and write | |
289 | ;; this as in output filter that converted sexps in the output | |
290 | ;; stream to their evaluated value. But that would have involved | |
291 | ;; more process coordination than I was happy to deal with. | |
e848854a RS |
292 | ;; |
293 | ;; NOTE: all temporary variables in this function will be in scope | |
294 | ;; during the eval, and so need to have non-clashing names. | |
295 | (let (ielm-form ; form to evaluate | |
296 | ielm-pos ; End posn of parse in string | |
297 | ielm-result ; Result, or error message | |
298 | ielm-error-type ; string, nil if no error | |
299 | (ielm-output "") ; result to display | |
300 | (ielm-wbuf ielm-working-buffer) ; current buffer after evaluation | |
301 | (ielm-pmark (ielm-pm))) | |
302 | (if (not (ielm-is-whitespace ielm-string)) | |
813f532d RS |
303 | (progn |
304 | (condition-case err | |
305 | (let (rout) | |
e848854a RS |
306 | (setq rout (read-from-string ielm-string)) |
307 | (setq ielm-form (car rout)) | |
308 | (setq ielm-pos (cdr rout))) | |
309 | (error (setq ielm-result (ielm-format-error err)) | |
310 | (setq ielm-error-type "Read error"))) | |
311 | (if ielm-error-type nil | |
312 | ;; Make sure working buffer has not been killed | |
313 | (if (not (buffer-name ielm-working-buffer)) | |
314 | (setq ielm-result "Working buffer has been killed" | |
315 | ielm-error-type "IELM Error" | |
316 | ielm-wbuf (current-buffer)) | |
317 | (if (ielm-is-whitespace (substring ielm-string ielm-pos)) | |
318 | ;; need this awful let convolution to work around | |
319 | ;; an Emacs bug involving local vbls and let binding | |
fed9da13 RS |
320 | (let ((*save *) |
321 | (**save **) | |
322 | (***save ***)) | |
565f89ec | 323 | (set-match-data ielm-match-data) |
e848854a RS |
324 | (save-excursion |
325 | (set-buffer ielm-working-buffer) | |
326 | (condition-case err | |
fed9da13 RS |
327 | (let ((* *save) |
328 | (** **save) | |
329 | (*** ***save) | |
e848854a RS |
330 | (ielm-obuf (current-buffer))) |
331 | (setq ielm-result (eval ielm-form)) | |
332 | (setq ielm-wbuf (current-buffer)) | |
333 | ;; The eval may have changed current-buffer; | |
334 | ;; need to set it back here to avoid a bug | |
335 | ;; in let. Don't want to use save-excursion | |
336 | ;; because we want to allow changes in point. | |
337 | (set-buffer ielm-obuf)) | |
338 | (error (setq ielm-result (ielm-format-error err)) | |
339 | (setq ielm-error-type "Eval error")) | |
340 | (quit (setq ielm-result "Quit during evaluation") | |
565f89ec SM |
341 | (setq ielm-error-type "Eval error")))) |
342 | (setq ielm-match-data (match-data))) | |
e848854a RS |
343 | (setq ielm-error-type "IELM error") |
344 | (setq ielm-result "More than one sexp in input")))) | |
813f532d RS |
345 | |
346 | ;; If the eval changed the current buffer, mention it here | |
e848854a RS |
347 | (if (eq ielm-wbuf ielm-working-buffer) nil |
348 | (message "current buffer is now: %s" ielm-wbuf) | |
349 | (setq ielm-working-buffer ielm-wbuf)) | |
813f532d | 350 | |
e848854a RS |
351 | (goto-char ielm-pmark) |
352 | (if (not ielm-error-type) | |
813f532d RS |
353 | (condition-case err |
354 | ;; Self-referential objects cause loops in the printer, so | |
355 | ;; trap quits here. May as well do errors, too | |
e848854a RS |
356 | (setq ielm-output (concat ielm-output (pp-to-string ielm-result))) |
357 | (error (setq ielm-error-type "IELM Error") | |
358 | (setq ielm-result "Error during pretty-printing (bug in pp)")) | |
359 | (quit (setq ielm-error-type "IELM Error") | |
360 | (setq ielm-result "Quit during pretty-printing")))) | |
361 | (if ielm-error-type | |
813f532d RS |
362 | (progn |
363 | (if ielm-noisy (ding)) | |
e848854a RS |
364 | (setq ielm-output (concat ielm-output "*** " ielm-error-type " *** ")) |
365 | (setq ielm-output (concat ielm-output ielm-result))) | |
d38e7d5f | 366 | ;; There was no error, so shift the *** values |
71d54f88 RS |
367 | (setq *** **) |
368 | (setq ** *) | |
369 | (setq * ielm-result)) | |
e848854a RS |
370 | (setq ielm-output (concat ielm-output "\n")))) |
371 | (setq ielm-output (concat ielm-output ielm-prompt)) | |
372 | (comint-output-filter (ielm-process) ielm-output))) | |
813f532d RS |
373 | |
374 | ;;; Process and marker utilities | |
375 | ||
376 | (defun ielm-process nil | |
e848854a | 377 | ;; Return the current buffer's process. |
813f532d RS |
378 | (get-buffer-process (current-buffer))) |
379 | ||
380 | (defun ielm-pm nil | |
e848854a | 381 | ;; Return the process mark of the current buffer. |
813f532d RS |
382 | (process-mark (get-buffer-process (current-buffer)))) |
383 | ||
384 | (defun ielm-set-pm (pos) | |
e848854a | 385 | ;; Set the process mark in the current buffer to POS. |
813f532d RS |
386 | (set-marker (process-mark (get-buffer-process (current-buffer))) pos)) |
387 | ||
388 | ;;; Major mode | |
389 | ||
95b20f3b RS |
390 | (put 'inferior-emacs-lisp-mode 'mode-class 'special) |
391 | ||
813f532d | 392 | (defun inferior-emacs-lisp-mode nil |
e848854a RS |
393 | "Major mode for interactively evaluating Emacs Lisp expressions. |
394 | Uses the interface provided by `comint-mode' (which see). | |
395 | ||
396 | * \\<ielm-map>\\[ielm-send-input] evaluates the sexp following the prompt. There must be at most | |
397 | one top-level sexp per prompt. | |
813f532d | 398 | |
e848854a RS |
399 | * \\[ielm-return] inserts a newline and indents, or evaluates a |
400 | complete expression (but see variable `ielm-dynamic-return'). | |
401 | Inputs longer than one line are moved to the line following the | |
402 | prompt (but see variable `ielm-dynamic-multiline-inputs'). | |
403 | ||
690ec649 | 404 | * \\[comint-dynamic-complete] completes Lisp symbols (or filenames, within strings), |
e848854a | 405 | or indents the line if there is nothing to complete. |
813f532d | 406 | |
fed9da13 | 407 | During evaluations, the values of the variables `*', `**', and `***' |
813f532d RS |
408 | are the results of the previous, second previous and third previous |
409 | evaluations respectively. | |
410 | ||
e848854a RS |
411 | The current working buffer may be changed (with a call to |
412 | `set-buffer', or with \\[ielm-change-working-buffer]), and its value | |
413 | is preserved between successive evaluations. In this way, expressions | |
414 | may be evaluated in a different buffer than the *ielm* buffer. | |
415 | Display the name of the working buffer with \\[ielm-print-working-buffer], | |
416 | or the buffer itself with \\[ielm-display-working-buffer]. | |
813f532d | 417 | |
e848854a RS |
418 | Expressions evaluated by IELM are not subject to `debug-on-quit' or |
419 | `debug-on-error'. | |
813f532d RS |
420 | |
421 | The behaviour of IELM may be customised with the following variables: | |
422 | * To stop beeping on error, set `ielm-noisy' to nil | |
423 | * If you don't like the prompt, you can change it by setting `ielm-prompt'. | |
424 | * Set `ielm-dynamic-return' to nil for bindings like `lisp-interaction-mode' | |
425 | * Entry to this mode runs `comint-mode-hook' and `ielm-mode-hook' | |
426 | (in that order). | |
427 | ||
428 | Customised bindings may be defined in `ielm-map', which currently contains: | |
429 | \\{ielm-map}" | |
430 | (interactive) | |
431 | (comint-mode) | |
432 | (setq comint-prompt-regexp (concat "^" (regexp-quote ielm-prompt))) | |
433 | (make-local-variable 'paragraph-start) | |
434 | (setq paragraph-start comint-prompt-regexp) | |
435 | (setq comint-input-sender 'ielm-input-sender) | |
436 | (setq comint-process-echoes nil) | |
690ec649 | 437 | (setq comint-dynamic-complete-functions |
813f532d | 438 | '(ielm-tab comint-replace-by-expanded-history ielm-complete-filename ielm-complete-symbol)) |
e848854a | 439 | (setq comint-get-old-input 'ielm-get-old-input) |
34ce46c8 KH |
440 | (make-local-variable 'comint-completion-addsuffix) |
441 | (setq comint-completion-addsuffix | |
442 | (cons (char-to-string directory-sep-char) "")) | |
813f532d RS |
443 | |
444 | (setq major-mode 'inferior-emacs-lisp-mode) | |
445 | (setq mode-name "IELM") | |
446 | (use-local-map ielm-map) | |
447 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
448 | ||
449 | (make-local-variable 'indent-line-function) | |
450 | (make-local-variable 'ielm-working-buffer) | |
451 | (setq ielm-working-buffer (current-buffer)) | |
452 | (setq indent-line-function 'ielm-indent-line) | |
950086e6 KH |
453 | (make-local-variable 'fill-paragraph-function) |
454 | (setq fill-paragraph-function 'lisp-fill-paragraph) | |
813f532d | 455 | |
e848854a | 456 | ;; Value holders |
fed9da13 RS |
457 | (setq * nil) |
458 | (make-local-variable '*) | |
459 | (setq ** nil) | |
460 | (make-local-variable '**) | |
461 | (setq *** nil) | |
462 | (make-local-variable '***) | |
565f89ec | 463 | (set (make-local-variable 'ielm-match-data) nil) |
813f532d | 464 | |
9d42eea3 RS |
465 | ;; font-lock support |
466 | (make-local-variable 'font-lock-defaults) | |
690ec649 | 467 | (setq font-lock-defaults |
9d42eea3 | 468 | '(ielm-font-lock-keywords nil nil ((?: . "w") (?- . "w") (?* . "w")))) |
690ec649 | 469 | |
813f532d RS |
470 | ;; A dummy process to keep comint happy. It will never get any input |
471 | (if (comint-check-proc (current-buffer)) nil | |
33a65176 JR |
472 | ;; Was cat, but on non-Unix platforms that might not exist, so |
473 | ;; use hexl instead, which is part of the Emacs distribution. | |
474 | (start-process "ielm" (current-buffer) "hexl") | |
813f532d RS |
475 | (process-kill-without-query (ielm-process)) |
476 | (goto-char (point-max)) | |
477 | ;; Add a silly header | |
478 | (insert ielm-header) | |
479 | (ielm-set-pm (point-max)) | |
480 | (comint-output-filter (ielm-process) ielm-prompt) | |
481 | (set-marker comint-last-input-start (ielm-pm)) | |
482 | (set-process-filter (get-buffer-process (current-buffer)) 'comint-output-filter)) | |
483 | (run-hooks 'ielm-mode-hook)) | |
484 | ||
e848854a RS |
485 | (defun ielm-get-old-input nil |
486 | ;; Return the previous input surrounding point | |
487 | (save-excursion | |
488 | (beginning-of-line) | |
489 | (if (looking-at comint-prompt-regexp) nil | |
490 | (re-search-backward comint-prompt-regexp)) | |
491 | (comint-skip-prompt) | |
492 | (buffer-substring (point) (progn (forward-sexp 1) (point))))) | |
493 | ||
813f532d RS |
494 | ;;; User command |
495 | ||
9e983c78 RS |
496 | ;;;###autoload (add-hook 'same-window-buffer-names "*ielm*") |
497 | ||
e848854a | 498 | ;;;###autoload |
813f532d | 499 | (defun ielm nil |
e848854a | 500 | "Interactively evaluate Emacs Lisp expressions. |
9e983c78 | 501 | Switches to the buffer `*ielm*', or creates it if it does not exist." |
813f532d | 502 | (interactive) |
9e983c78 RS |
503 | (if (comint-check-proc "*ielm*") |
504 | nil | |
505 | (save-excursion | |
813f532d RS |
506 | (set-buffer (get-buffer-create "*ielm*")) |
507 | (inferior-emacs-lisp-mode))) | |
9e983c78 | 508 | (pop-to-buffer "*ielm*")) |
813f532d | 509 | |
896546cd RS |
510 | (provide 'ielm) |
511 | ||
e848854a | 512 | ;;; ielm.el ends here |