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d501f516 ER |
1 | ;;; view.el --- peruse file or buffer without editing. |
2 | ||
eea8d4ef ER |
3 | ;; Copyright (C) 1985, 1989 Free Software Foundation, Inc. |
4 | ||
e5167999 ER |
5 | ;; Author: K. Shane Hartman |
6 | ;; Maintainer: FSF | |
e6211d55 RS |
7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
e6211d55 RS |
13 | ;; any later version. |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
23 | ||
c91c4e6d ER |
24 | ;;; Commentary: |
25 | ||
26 | ;; This package provides the `view' major mode documented in the Emacs | |
27 | ;; user's manual. | |
28 | ||
e5167999 | 29 | ;;; Code: |
e6211d55 | 30 | |
e6211d55 RS |
31 | (defvar view-mode-map nil) |
32 | (if view-mode-map | |
33 | nil | |
34 | (setq view-mode-map (make-keymap)) | |
b82fef5c | 35 | (fillarray (nth 1 view-mode-map) 'View-undefined) |
e6211d55 RS |
36 | (define-key view-mode-map "\C-c" 'view-exit) |
37 | (define-key view-mode-map "\C-z" 'suspend-emacs) | |
38 | (define-key view-mode-map "q" 'view-exit) | |
39 | (define-key view-mode-map "-" 'negative-argument) | |
40 | (define-key view-mode-map "0" 'digit-argument) | |
41 | (define-key view-mode-map "1" 'digit-argument) | |
42 | (define-key view-mode-map "2" 'digit-argument) | |
43 | (define-key view-mode-map "3" 'digit-argument) | |
44 | (define-key view-mode-map "4" 'digit-argument) | |
45 | (define-key view-mode-map "5" 'digit-argument) | |
46 | (define-key view-mode-map "6" 'digit-argument) | |
47 | (define-key view-mode-map "7" 'digit-argument) | |
48 | (define-key view-mode-map "8" 'digit-argument) | |
49 | (define-key view-mode-map "9" 'digit-argument) | |
50 | (define-key view-mode-map "\C-u" 'universal-argument) | |
51 | (define-key view-mode-map "\e" nil) | |
52 | (define-key view-mode-map "\C-x" 'Control-X-prefix) | |
53 | (define-key view-mode-map "\e-" 'negative-argument) | |
54 | (define-key view-mode-map "\e0" 'digit-argument) | |
55 | (define-key view-mode-map "\e1" 'digit-argument) | |
56 | (define-key view-mode-map "\e2" 'digit-argument) | |
57 | (define-key view-mode-map "\e3" 'digit-argument) | |
58 | (define-key view-mode-map "\e4" 'digit-argument) | |
59 | (define-key view-mode-map "\e5" 'digit-argument) | |
60 | (define-key view-mode-map "\e6" 'digit-argument) | |
61 | (define-key view-mode-map "\e7" 'digit-argument) | |
62 | (define-key view-mode-map "\e8" 'digit-argument) | |
63 | (define-key view-mode-map "\e9" 'digit-argument) | |
64 | (define-key view-mode-map "<" 'beginning-of-buffer) | |
65 | (define-key view-mode-map ">" 'end-of-buffer) | |
66 | (define-key view-mode-map "\ev" 'View-scroll-lines-backward) | |
67 | (define-key view-mode-map "\C-v" 'View-scroll-lines-forward) | |
68 | (define-key view-mode-map " " 'View-scroll-lines-forward) | |
69 | (define-key view-mode-map "\177" 'View-scroll-lines-backward) | |
70 | (define-key view-mode-map "\n" 'View-scroll-one-more-line) | |
71 | (define-key view-mode-map "\r" 'View-scroll-one-more-line) | |
72 | (define-key view-mode-map "\C-l" 'recenter) | |
73 | (define-key view-mode-map "z" 'View-scroll-lines-forward-set-scroll-size) | |
74 | (define-key view-mode-map "g" 'View-goto-line) | |
75 | (define-key view-mode-map "=" 'what-line) | |
76 | (define-key view-mode-map "." 'set-mark-command) | |
77 | (define-key view-mode-map "\C-@" 'set-mark-command) | |
78 | (define-key view-mode-map "'" 'View-back-to-mark) | |
79 | (define-key view-mode-map "@" 'View-back-to-mark) | |
80 | (define-key view-mode-map "x" 'exchange-point-and-mark) | |
81 | (define-key view-mode-map "h" 'Helper-describe-bindings) | |
82 | (define-key view-mode-map "?" 'Helper-describe-bindings) | |
803eaf50 | 83 | (define-key view-mode-map (char-to-string help-char) 'Helper-help) |
e6211d55 RS |
84 | (define-key view-mode-map "\C-n" 'next-line) |
85 | (define-key view-mode-map "\C-p" 'previous-line) | |
86 | (define-key view-mode-map "\C-s" 'isearch-forward) | |
87 | (define-key view-mode-map "\C-r" 'isearch-backward) | |
88 | (define-key view-mode-map "s" 'isearch-forward) | |
89 | (define-key view-mode-map "r" 'isearch-backward) | |
90 | (define-key view-mode-map "/" 'View-search-regexp-forward) | |
91 | (define-key view-mode-map "\\" 'View-search-regexp-backward) | |
92 | ;; This conflicts with the standard binding of isearch-regexp-forward | |
93 | (define-key view-mode-map "\e\C-s" 'View-search-regexp-forward) | |
94 | (define-key view-mode-map "\e\C-r" 'View-search-regexp-backward) | |
95 | (define-key view-mode-map "n" 'View-search-last-regexp-forward) | |
96 | (define-key view-mode-map "p" 'View-search-last-regexp-backward) | |
97 | ) | |
98 | ||
99 | ||
7229064d | 100 | ;;;###autoload |
e6211d55 RS |
101 | (defun view-file (file-name) |
102 | "View FILE in View mode, returning to previous buffer when done. | |
103 | The usual Emacs commands are not available; instead, | |
104 | a special set of commands (mostly letters and punctuation) | |
105 | are defined for moving around in the buffer. | |
106 | Space scrolls forward, Delete scrolls backward. | |
107 | For list of all View commands, type ? or h while viewing. | |
108 | ||
5c05f569 | 109 | This command runs the normal hook `view-hook'." |
e6211d55 RS |
110 | (interactive "fView file: ") |
111 | (let ((old-buf (current-buffer)) | |
112 | (had-a-buf (get-file-buffer file-name)) | |
113 | (buf-to-view (find-file-noselect file-name))) | |
114 | (switch-to-buffer buf-to-view t) | |
115 | (view-mode old-buf | |
116 | (and (not had-a-buf) (not (buffer-modified-p buf-to-view)) | |
117 | 'kill-buffer)))) | |
118 | ||
b82fef5c JB |
119 | ;;;###autoload |
120 | (defun view-file-other-window (file-name) | |
121 | "View FILE in View mode in other window. | |
122 | Return to previous buffer when done. | |
123 | The usual Emacs commands are not available; instead, | |
124 | a special set of commands (mostly letters and punctuation) | |
125 | are defined for moving around in the buffer. | |
126 | Space scrolls forward, Delete scrolls backward. | |
127 | For list of all View commands, type ? or h while viewing. | |
128 | ||
5c05f569 | 129 | This command runs the normal hook `view-hook'." |
b82fef5c JB |
130 | (interactive "fView file: ") |
131 | (let ((old-arrangement (current-window-configuration)) | |
132 | (had-a-buf (get-file-buffer file-name)) | |
133 | (buf-to-view (find-file-noselect file-name))) | |
134 | (switch-to-buffer-other-window buf-to-view) | |
135 | (view-mode old-arrangement | |
136 | (and (not had-a-buf) (not (buffer-modified-p buf-to-view)) | |
137 | 'kill-buffer)))) | |
138 | ||
7229064d | 139 | ;;;###autoload |
e6211d55 RS |
140 | (defun view-buffer (buffer-name) |
141 | "View BUFFER in View mode, returning to previous buffer when done. | |
142 | The usual Emacs commands are not available; instead, | |
143 | a special set of commands (mostly letters and punctuation) | |
144 | are defined for moving around in the buffer. | |
145 | Space scrolls forward, Delete scrolls backward. | |
146 | For list of all View commands, type ? or h while viewing. | |
147 | ||
5c05f569 | 148 | This command runs the normal hook `view-hook'." |
e6211d55 RS |
149 | (interactive "bView buffer: ") |
150 | (let ((old-buf (current-buffer))) | |
151 | (switch-to-buffer buffer-name t) | |
152 | (view-mode old-buf nil))) | |
153 | ||
b82fef5c JB |
154 | ;;;###autoload |
155 | (defun view-buffer-other-window (buffer-name not-return) | |
156 | "View BUFFER in View mode in another window, | |
5c05f569 RS |
157 | returning to original buffer when done *only* if |
158 | prefix argument NOT-RETURN is nil (which is the default). | |
159 | ||
160 | The usual Emacs commands are not available in View mode; instead, | |
b82fef5c JB |
161 | a special set of commands (mostly letters and punctuation) |
162 | are defined for moving around in the buffer. | |
163 | Space scrolls forward, Delete scrolls backward. | |
164 | For list of all View commands, type ? or h while viewing. | |
165 | ||
5c05f569 | 166 | This command runs the normal hook `view-hook'." |
79d0c1e7 | 167 | (interactive "bView buffer:\nP") |
b82fef5c JB |
168 | (let ((return-to (and not-return (current-window-configuration)))) |
169 | (switch-to-buffer-other-window buffer-name) | |
170 | (view-mode return-to))) | |
171 | ||
7229064d | 172 | ;;;###autoload |
e6211d55 RS |
173 | (defun view-mode (&optional prev-buffer action) |
174 | "Major mode for viewing text but not editing it. | |
175 | Letters do not insert themselves. Instead these commands are provided. | |
176 | Most commands take prefix arguments. Commands dealing with lines | |
177 | default to \"scroll size\" lines (initially size of window). | |
178 | Search commands default to a repeat count of one. | |
179 | M-< or < move to beginning of buffer. | |
180 | M-> or > move to end of buffer. | |
181 | C-v or Space scroll forward lines. | |
182 | M-v or DEL scroll backward lines. | |
183 | CR or LF scroll forward one line (backward with prefix argument). | |
184 | z like Space except set number of lines for further | |
185 | scrolling commands to scroll by. | |
186 | C-u and Digits provide prefix arguments. `-' denotes negative argument. | |
187 | = prints the current line number. | |
188 | g goes to line given by prefix argument. | |
189 | / or M-C-s searches forward for regular expression | |
190 | \\ or M-C-r searches backward for regular expression. | |
191 | n searches forward for last regular expression. | |
192 | p searches backward for last regular expression. | |
193 | C-@ or . set the mark. | |
194 | x exchanges point and mark. | |
195 | C-s or s do forward incremental search. | |
196 | C-r or r do reverse incremental search. | |
197 | @ or ' return to mark and pops mark ring. | |
198 | Mark ring is pushed at start of every | |
199 | successful search and when jump to line to occurs. | |
200 | The mark is set on jump to buffer start or end. | |
201 | ? or h provide help message (list of commands). | |
803eaf50 | 202 | \\[Helper-help] provides help (list of commands or description of a command). |
e6211d55 RS |
203 | C-n moves down lines vertically. |
204 | C-p moves upward lines vertically. | |
205 | C-l recenters the screen. | |
206 | q or C-c exit view-mode and return to previous buffer. | |
207 | ||
5c05f569 RS |
208 | Entry to this mode runs the normal hook `view-hook'. |
209 | ||
e6211d55 RS |
210 | \\{view-mode-map}" |
211 | ; Not interactive because dangerous things happen | |
212 | ; if you call it without passing a buffer as argument | |
213 | ; and they are not easy to fix. | |
214 | ; (interactive) | |
215 | (make-local-variable 'view-old-mode-line-buffer-identification) | |
216 | (setq view-old-mode-line-buffer-identification | |
217 | mode-line-buffer-identification) | |
218 | (make-local-variable 'view-old-buffer-read-only) | |
219 | (setq view-old-buffer-read-only buffer-read-only) | |
220 | (make-local-variable 'view-old-mode-name) | |
221 | (setq view-old-mode-name mode-name) | |
222 | (make-local-variable 'view-old-major-mode) | |
223 | (setq view-old-major-mode major-mode) | |
224 | (make-local-variable 'view-old-local-map) | |
225 | (setq view-old-local-map (current-local-map)) | |
226 | (make-local-variable 'view-old-Helper-return-blurb) | |
227 | (setq view-old-Helper-return-blurb | |
228 | (and (boundp 'Helper-return-blurb) Helper-return-blurb)) | |
229 | ||
230 | (setq buffer-read-only t) | |
231 | (setq mode-line-buffer-identification | |
232 | (list | |
233 | (if (buffer-file-name) | |
234 | "Viewing %f" | |
235 | "Viewing %b"))) | |
236 | (setq mode-name "View") | |
237 | (setq major-mode 'view-mode) | |
238 | (setq Helper-return-blurb | |
239 | (format "continue viewing %s" | |
240 | (if (buffer-file-name) | |
241 | (file-name-nondirectory (buffer-file-name)) | |
242 | (buffer-name)))) | |
243 | ||
244 | (make-local-variable 'view-exit-action) | |
245 | (setq view-exit-action action) | |
b82fef5c JB |
246 | (make-local-variable 'view-return-here) |
247 | (setq view-return-here prev-buffer) | |
e6211d55 RS |
248 | (make-local-variable 'view-exit-position) |
249 | (setq view-exit-position (point-marker)) | |
250 | ||
251 | (make-local-variable 'view-scroll-size) | |
252 | (setq view-scroll-size nil) | |
253 | (make-local-variable 'view-last-regexp) | |
254 | (setq view-last-regexp nil) | |
255 | ||
256 | (beginning-of-line) | |
257 | (setq goal-column nil) | |
258 | ||
259 | (use-local-map view-mode-map) | |
260 | (run-hooks 'view-hook) | |
261 | (view-helpful-message)) | |
262 | ||
b82fef5c | 263 | \f |
e6211d55 RS |
264 | (defun view-exit () |
265 | "Exit from view-mode. | |
266 | If you viewed an existing buffer, that buffer returns to its previous mode. | |
267 | If you viewed a file that was not present in Emacs, its buffer is killed." | |
268 | (interactive) | |
269 | (setq mode-line-buffer-identification | |
270 | view-old-mode-line-buffer-identification) | |
271 | (setq major-mode view-old-major-mode) | |
272 | (setq mode-name view-old-mode-name) | |
54d1c8fa | 273 | (use-local-map view-old-local-map) |
e6211d55 RS |
274 | (setq buffer-read-only view-old-buffer-read-only) |
275 | ||
276 | (goto-char view-exit-position) | |
277 | (set-marker view-exit-position nil) | |
278 | ||
279 | ;; Now do something to the buffer that we were viewing | |
280 | ;; (such as kill it). | |
281 | (let ((viewed-buffer (current-buffer)) | |
282 | (action view-exit-action)) | |
b82fef5c JB |
283 | (cond |
284 | ((bufferp view-return-here) | |
285 | (switch-to-buffer view-return-here)) | |
286 | ((window-configuration-p view-return-here) | |
287 | (set-window-configuration view-return-here))) | |
e6211d55 RS |
288 | (if action (funcall action viewed-buffer)))) |
289 | ||
290 | (defun view-helpful-message () | |
291 | (message | |
e6211d55 | 292 | (substitute-command-keys |
802e7beb | 293 | "Type \\[Helper-help] for help, \\[Helper-describe-bindings] for commands, \\[view-exit] to quit."))) |
e6211d55 RS |
294 | |
295 | (defun View-undefined () | |
296 | (interactive) | |
297 | (ding) | |
298 | (view-helpful-message)) | |
299 | ||
300 | (defun view-window-size () (1- (window-height))) | |
301 | ||
302 | (defun view-scroll-size () | |
303 | (min (view-window-size) (or view-scroll-size (view-window-size)))) | |
304 | ||
305 | (defvar view-hook nil | |
5c05f569 | 306 | "Normal hook run when starting to view a buffer or file.") |
e6211d55 RS |
307 | |
308 | ;(defun view-last-command (&optional who what) | |
309 | ; (setq view-last-command-entry this-command) | |
310 | ; (setq view-last-command who) | |
311 | ; (setq view-last-command-argument what)) | |
312 | ||
313 | ;(defun View-repeat-last-command () | |
314 | ; "Repeat last command issued in View mode." | |
315 | ; (interactive) | |
316 | ; (if (and view-last-command | |
317 | ; (eq view-last-command-entry last-command)) | |
318 | ; (funcall view-last-command view-last-command-argument)) | |
319 | ; (setq this-command view-last-command-entry)) | |
320 | ||
321 | (defun View-goto-line (&optional line) | |
5c05f569 | 322 | "Move to line LINE in View mode. |
e6211d55 RS |
323 | Display is centered at LINE. Sets mark at starting position and pushes |
324 | mark ring." | |
325 | (interactive "p") | |
326 | (push-mark) | |
327 | (goto-line (or line 1)) | |
328 | (recenter (/ (view-window-size) 2))) | |
329 | ||
330 | (defun View-scroll-lines-forward (&optional lines) | |
331 | "Scroll forward in View mode, or exit if end of text is visible. | |
332 | No arg means whole window full, or number of lines set by \\[View-scroll-lines-forward-set-scroll-size]. | |
333 | Arg is number of lines to scroll." | |
334 | (interactive "P") | |
335 | (if (pos-visible-in-window-p (point-max)) | |
ca160bc4 RS |
336 | (view-exit) |
337 | (setq lines | |
338 | (if lines (prefix-numeric-value lines) | |
339 | (view-scroll-size))) | |
340 | ;; (view-last-command 'View-scroll-lines-forward lines) | |
341 | (if (>= lines (view-window-size)) | |
342 | (scroll-up nil) | |
343 | (if (>= (- lines) (view-window-size)) | |
344 | (scroll-down nil) | |
345 | (scroll-up lines))) | |
346 | (cond ((pos-visible-in-window-p (point-max)) | |
347 | (goto-char (point-max)) | |
348 | (recenter -1) | |
349 | (message (substitute-command-keys | |
350 | "End. Type \\[view-exit] to quit viewing.")))) | |
351 | (move-to-window-line -1) | |
352 | (beginning-of-line))) | |
e6211d55 RS |
353 | |
354 | (defun View-scroll-lines-forward-set-scroll-size (&optional lines) | |
355 | "Scroll forward LINES lines in View mode, setting the \"scroll size\". | |
356 | This is the number of lines which \\[View-scroll-lines-forward] and \\[View-scroll-lines-backward] scroll by default. | |
357 | The absolute value of LINES is used, so this command can be used to scroll | |
358 | backwards (but \"scroll size\" is always positive). If LINES is greater than | |
359 | window height or omitted, then window height is assumed. If LINES is less | |
360 | than window height then scrolling context is provided from previous screen." | |
361 | (interactive "P") | |
362 | (if (not lines) | |
363 | (setq view-scroll-size (view-window-size)) | |
364 | (setq lines (prefix-numeric-value lines)) | |
365 | (setq view-scroll-size | |
366 | (min (if (> lines 0) lines (- lines)) (view-window-size)))) | |
367 | (View-scroll-lines-forward lines)) | |
368 | ||
369 | (defun View-scroll-one-more-line (&optional arg) | |
370 | "Scroll one more line up in View mode. | |
371 | With ARG scroll one line down." | |
372 | (interactive "P") | |
373 | (View-scroll-lines-forward (if (not arg) 1 -1))) | |
374 | ||
375 | (defun View-scroll-lines-backward (&optional lines) | |
376 | "Scroll backward in View mode. | |
377 | No arg means whole window full, or number of lines set by \\[View-scroll-lines-forward-set-scroll-size]. | |
378 | Arg is number of lines to scroll." | |
379 | (interactive "P") | |
380 | (View-scroll-lines-forward (if lines | |
381 | (- (prefix-numeric-value lines)) | |
382 | (- (view-scroll-size))))) | |
383 | ||
5c05f569 RS |
384 | (defun View-search-regexp-forward (n regexp) |
385 | "Search forward for Nth occurrence of REGEXP. | |
e6211d55 RS |
386 | Displays line found at center of window. REGEXP is remembered for |
387 | searching with \\[View-search-last-regexp-forward] and \\[View-search-last-regexp-backward]. Sets mark at starting position and pushes mark ring." | |
388 | (interactive "p\nsSearch forward (regexp): ") | |
389 | (if (> (length regexp) 0) | |
390 | (progn | |
5c05f569 RS |
391 | ;(view-last-command 'View-search-last-regexp-forward n) |
392 | (view-search n regexp)))) | |
e6211d55 | 393 | |
5c05f569 RS |
394 | (defun View-search-regexp-backward (n regexp) |
395 | "Search backward from window start for Nth instance of REGEXP. | |
e6211d55 RS |
396 | Displays line found at center of window. REGEXP is remembered for |
397 | searching with \\[View-search-last-regexp-forward] and \\[View-search-last-regexp-backward]. Sets mark at starting position and pushes mark ring." | |
398 | (interactive "p\nsSearch backward (regexp): ") | |
5c05f569 | 399 | (View-search-regexp-forward (- n) regexp)) |
e6211d55 | 400 | |
5c05f569 RS |
401 | (defun View-search-last-regexp-forward (n) |
402 | "Search forward from window end for Nth instance of last regexp. | |
e6211d55 RS |
403 | Displays line found at center of window. Sets mark at starting position |
404 | and pushes mark ring." | |
405 | (interactive "p") | |
5c05f569 | 406 | (View-search-regexp-forward n view-last-regexp)) |
e6211d55 | 407 | |
5c05f569 RS |
408 | (defun View-search-last-regexp-backward (n) |
409 | "Search backward from window start for Nth instance of last regexp. | |
e6211d55 RS |
410 | Displays line found at center of window. Sets mark at starting position and |
411 | pushes mark ring." | |
412 | (interactive "p") | |
5c05f569 | 413 | (View-search-regexp-backward n view-last-regexp)) |
e6211d55 RS |
414 | |
415 | (defun View-back-to-mark (&optional ignore) | |
416 | "Return to last mark set in View mode, else beginning of file. | |
417 | Displays line at center of window. Pops mark ring so successive | |
418 | invocations return to earlier marks." | |
419 | (interactive) | |
420 | (goto-char (or (mark) (point-min))) | |
421 | (pop-mark) | |
422 | (recenter (/ (view-window-size) 2))) | |
423 | ||
424 | (defun view-search (times regexp) | |
425 | (setq view-last-regexp regexp) | |
426 | (let (where) | |
427 | (save-excursion | |
428 | (move-to-window-line (if (< times 0) 0 -1)) | |
429 | (if (re-search-forward regexp nil t times) | |
430 | (setq where (point)))) | |
431 | (if where | |
432 | (progn | |
433 | (push-mark) | |
434 | (goto-char where) | |
435 | (beginning-of-line) | |
436 | (recenter (/ (view-window-size) 2))) | |
437 | (message "Can't find occurrence %d of %s" times regexp) | |
438 | (sit-for 4)))) | |
439 | ||
b82fef5c | 440 | \f |
49116ac0 JB |
441 | (provide 'view) |
442 | ||
d501f516 | 443 | ;;; view.el ends here |