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annotate lisp/view-less.el @ 5404:91b3aa59f49b
Convert lisp/ to GPLv3.
| author | Mike Sperber <sperber@deinprogramm.de> |
|---|---|
| date | Fri, 15 Oct 2010 15:18:27 +0200 |
| parents | 9058351b0236 |
| children | b3b28406da8c |
| rev | line source |
|---|---|
| 428 | 1 ;;; view-less.el --- Minor mode for browsing files with keybindings like `less' |
| 2 | |
| 3 ;; Copyright (C) 1994, 1995 Tinker Systems and INS Engineering Corp. | |
| 4 | |
| 5 ;; Author: Jonathan Stigelman <stig@hackvan.com> | |
| 6 ;; Maintainer: XEmacs Development Team | |
| 7 ;; Keywords: wp, unix | |
| 8 | |
| 9 ;; This file is part of XEmacs. | |
| 444 | 10 ;; |
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11 ;; XEmacs is free software: you can redistribute it and/or modify it |
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12 ;; under the terms of the GNU General Public License as published by the |
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13 ;; Free Software Foundation, either version 3 of the License, or (at your |
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14 ;; option) any later version. |
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15 |
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16 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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17 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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18 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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19 ;; for more details. |
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20 |
| 428 | 21 ;; You should have received a copy of the GNU General Public License |
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22 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 428 | 23 |
| 24 ;;; Synched up with: Not in FSF. | |
| 25 | |
| 26 ;;; Commentary: | |
| 27 | |
| 28 ;; This mode is for browsing files without changing them. Keybindings | |
| 29 ;; similar to those used by the less(1) program are used. | |
| 30 ;; | |
| 31 ;; Originally written for v18 by David Gudeman (gudeman@arizona.edu) | |
| 32 ;; Mods by Bengt Martensson, to closely resemble less (July 1987) | |
| 33 ;; | |
| 444 | 34 ;; If you would like all write-protected files to be visited in view-mode, |
| 428 | 35 ;; then add the following to your .emacs file: |
| 36 ;; | |
| 37 ;; (add-hook 'find-file-hooks 'auto-view-mode) | |
| 38 | |
| 39 ;;; Code: | |
| 40 | |
| 41 (defvar view-search-string "" | |
| 42 "Last string searched for with view-search functions.") | |
| 43 | |
| 44 (defvar view-search-arg 1 | |
| 45 "Argument to last view search.") | |
| 46 | |
| 47 (defvar view-default-lines 10 | |
| 48 "Default value for the \"d\" and \"u\" commands in view-mode") | |
| 49 | |
| 1333 | 50 ;;;###autoload |
| 428 | 51 (defvar view-minor-mode nil |
| 52 "Non-nil when view-mode is active. Call `view-mode' to toggle.") | |
| 53 (make-variable-buffer-local 'view-minor-mode) | |
| 54 | |
| 55 ;;;###autoload | |
| 56 (defvar view-minor-mode-map | |
| 57 (let ((map (make-keymap))) | |
| 58 (set-keymap-name map 'view-minor-mode-map) | |
| 59 (suppress-keymap map) | |
| 60 (define-key map "-" 'negative-argument) | |
| 61 (define-key map " " 'scroll-up) | |
| 62 (define-key map "f" 'scroll-up) | |
| 63 (define-key map "b" 'scroll-down) | |
| 64 (define-key map 'backspace 'scroll-down) | |
| 65 (define-key map 'delete 'scroll-down) | |
| 66 (define-key map "\r" 'view-scroll-lines-up) | |
| 67 (define-key map "\n" 'view-scroll-lines-up) | |
| 68 (define-key map "e" 'view-scroll-lines-up) | |
| 69 (define-key map "j" 'view-scroll-lines-up) | |
| 70 (define-key map "y" 'view-scroll-lines-down) | |
| 71 (define-key map "k" 'view-scroll-lines-down) | |
| 72 (define-key map "d" 'view-scroll-some-lines-up) | |
| 73 (define-key map "u" 'view-scroll-some-lines-down) | |
| 74 (define-key map "r" 'recenter) | |
| 75 (define-key map "t" 'toggle-truncate-lines) | |
| 76 (define-key map "N" 'view-buffer) | |
| 77 (define-key map "E" 'view-file) | |
| 78 (define-key map "P" 'view-buffer) | |
| 79 (define-key map "!" 'shell-command) | |
| 80 (define-key map "|" 'shell-command-on-region) | |
| 81 (define-key map "=" 'what-line) | |
| 82 (define-key map "?" 'view-search-backward) | |
| 83 (define-key map "h" 'view-mode-describe) | |
| 84 (define-key map "s" 'view-repeat-search) | |
| 85 (define-key map "n" 'view-repeat-search) | |
| 86 (define-key map "/" 'view-search-forward) | |
| 87 (define-key map "\\" 'view-search-backward) | |
| 88 (define-key map "g" 'view-goto-line) | |
| 89 (define-key map "G" 'view-last-windowful) | |
| 90 (define-key map "%" 'view-goto-percent) | |
| 91 (define-key map "p" 'view-goto-percent) | |
| 92 (define-key map "m" 'point-to-register) | |
| 93 (define-key map "'" 'register-to-point) | |
| 94 (define-key map "C" 'view-cleanup-backspaces) | |
| 95 (define-key map "\C-c\C-c" 'view-quit) | |
| 96 ;; #### - should this use substitute-command-keys? | |
| 97 (define-key map "\C-x\C-q" 'view-quit-toggle-ro) | |
| 98 (define-key map "q" 'view-quit) | |
| 99 map | |
| 100 )) | |
| 101 | |
| 695 | 102 ;;;###autoload |
| 103 (defcustom view-mode-line-string " View" | |
| 104 "*String to display in the modeline when View mode is active. | |
| 105 Set this to nil if you don't want a modeline indicator." | |
| 106 :type '(choice string | |
| 107 (const :tag "none" nil))) | |
| 108 | |
| 109 (add-minor-mode 'view-minor-mode | |
| 110 'view-mode-line-string | |
| 111 view-minor-mode-map) | |
| 428 | 112 |
| 113 ;;;###autoload | |
| 114 (defvar view-mode-map | |
| 115 (let ((map (copy-keymap view-minor-mode-map))) | |
| 116 (set-keymap-name map 'view-mode-map) | |
| 117 map)) | |
| 118 | |
| 119 ;;;###autoload | |
| 444 | 120 (defun view-file (filename &optional other-window-p) |
| 121 "Find FILENAME, enter view mode. With prefix arg OTHER-WINDOW-P, use other window." | |
| 428 | 122 (interactive "fView File: \nP") |
| 444 | 123 (let ((old-p (get-file-buffer filename)) |
| 428 | 124 (obuf (current-buffer))) |
| 444 | 125 (if other-window-p |
| 126 (find-file-other-window filename) | |
| 127 (find-file filename)) | |
| 128 (view-mode (if other-window-p nil obuf) | |
| 428 | 129 (if old-p nil 'kill-buffer)) |
| 130 nil)) | |
| 131 | |
| 132 ;;;###autoload | |
| 444 | 133 (defun view-buffer (buffer &optional other-window-p) |
| 134 "Switch to BUFFER, enter view mode. With prefix arg use other window." | |
| 428 | 135 (interactive "bView Buffer: \nP") |
| 136 (let ((obuf (current-buffer))) | |
| 444 | 137 (if other-window-p |
| 138 (switch-to-buffer-other-window buffer) | |
| 139 (switch-to-buffer buffer)) | |
| 140 (view-mode (if other-window-p nil obuf) | |
| 141 (if other-window-p nil 'bury-buffer)))) | |
| 428 | 142 |
| 143 ;;;###autoload | |
| 444 | 144 (defun view-file-other-window (filename) |
| 145 "Find FILENAME in other window, and enter view mode." | |
| 428 | 146 (interactive "fView File: ") |
| 444 | 147 (view-file filename t)) |
| 428 | 148 |
| 149 ;;;###autoload | |
| 150 (defun view-buffer-other-window (buffer) | |
| 151 "Switch to BUFFER in another window, and enter view mode." | |
| 152 (interactive "bView Buffer: ") | |
| 153 (view-buffer buffer t)) | |
| 154 | |
| 155 (defun view-brief-help () | |
| 156 (message | |
| 157 (substitute-command-keys | |
| 158 "\\<view-minor-mode-map>\\[scroll-up] = page forward; \\[scroll-down] = page back; \ | |
| 159 \\[view-mode-describe] = help; \\[view-quit] = quit."))) | |
| 160 | |
| 161 (defvar view-major-mode) | |
| 162 (defvar view-exit-position) | |
| 163 (defvar view-prev-buffer) | |
| 164 (defvar view-exit-action) | |
| 165 (defvar view-old-buffer-read-only) | |
| 166 | |
| 167 ;;;###autoload | |
| 168 (defun view-minor-mode (&optional prev-buffer exit-action) | |
| 169 "Minor mode for viewing text, with bindings like `less'. | |
| 170 Commands are: | |
| 171 \\<view-minor-mode-map> | |
| 172 0..9 prefix args | |
| 173 - prefix minus | |
| 174 \\[scroll-up] page forward | |
| 175 \\[scroll-down] page back | |
| 176 \\[view-scroll-lines-up] scroll prefix-arg lines forward, default 1. | |
| 177 \\[view-scroll-lines-down] scroll prefix-arg lines backward, default 1. | |
| 178 \\[view-scroll-some-lines-down] scroll prefix-arg lines backward, default 10. | |
| 179 \\[view-scroll-some-lines-up] scroll prefix-arg lines forward, default 10. | |
| 180 \\[what-line] print line number | |
| 181 \\[view-mode-describe] print this help message | |
| 182 \\[view-search-forward] regexp search, uses previous string if you just hit RET | |
| 183 \\[view-search-backward] as above but searches backward | |
| 184 \\[view-repeat-search] repeat last search | |
| 185 \\[view-goto-line] goto line prefix-arg, default 1 | |
| 186 \\[view-last-windowful] goto line prefix-arg, default last line | |
| 187 \\[view-goto-percent] goto a position by percentage | |
| 188 \\[toggle-truncate-lines] toggle truncate-lines | |
| 189 \\[view-file] view another file | |
| 190 \\[view-buffer] view another buffer | |
| 191 \\[view-cleanup-backspaces] cleanup backspace constructions | |
| 192 \\[shell-command] execute a shell command | |
| 193 \\[shell-command-on-region]\ | |
| 194 execute a shell command with the region as input | |
| 195 \\[view-quit] exit view-mode, and bury the current buffer. | |
| 196 | |
| 197 If invoked with the optional (prefix) arg non-nil, view-mode cleans up | |
| 198 backspace constructions. | |
| 199 | |
| 200 More precisely: | |
| 201 \\{view-minor-mode-map}" | |
| 202 (interactive) | |
| 203 | |
| 204 (make-local-variable 'view-default-lines) | |
| 205 (set (make-local-variable 'view-exit-position) (point)) | |
| 206 (set (make-local-variable 'view-prev-buffer) prev-buffer) | |
| 207 (set (make-local-variable 'view-exit-action) exit-action) | |
| 208 (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only) | |
| 209 (add-hook (make-local-variable 'change-major-mode-hook) | |
| 210 'view-fixup-read-only) | |
| 211 (setq view-minor-mode t | |
| 212 buffer-read-only t) | |
| 213 (view-brief-help)) | |
| 214 | |
| 215 ;;;###autoload | |
| 216 (defun view-mode (&optional prev-buffer exit-action clean-bs) | |
| 217 "View the current buffer using view-minor-mode. This exists to be 99.9% | |
| 218 compatible with the implementations of `view-mode' in view.el and older | |
| 219 versions of view-less.el." | |
| 220 (interactive (list nil 'bury-buffer current-prefix-arg)) | |
| 221 ;; #### - The first two arguments provide compatibility with view.el (and | |
| 222 ;; thus FSFmacs), while the third argument as a prefix argument maintains | |
| 223 ;; interactive compatibility with older versions of view-less. --Stig | |
| 224 (if clean-bs (cleanup-backspaces)) | |
| 225 (view-minor-mode prev-buffer exit-action)) | |
| 226 | |
| 227 ;;;###autoload | |
| 228 (defun view-major-mode (&optional prev-buffer exit-action clean-bs) | |
| 229 "View the current buffer using view-mode, as a major mode. | |
| 230 This function has a nonstandard name because `view-mode' is wrongly | |
| 231 named but is like this for compatibility reasons." | |
| 232 ;; #### - The first two arguments provide compatibility with view.el (and | |
| 233 ;; thus FSFmacs), while the third argument as a prefix argument maintains | |
| 234 ;; interactive compatibility with older versions of view-less. --Stig | |
| 235 (interactive (list nil 'bury-buffer current-prefix-arg)) | |
| 236 (kill-all-local-variables) | |
| 237 (use-local-map view-mode-map) | |
| 238 (setq major-mode 'view-mode) | |
| 239 (set (make-local-variable 'view-exit-position) (point)) | |
| 240 (set (make-local-variable 'view-prev-buffer) prev-buffer) | |
| 241 (set (make-local-variable 'view-exit-action) exit-action) | |
| 242 (set (make-local-variable 'view-old-buffer-read-only) buffer-read-only) | |
| 243 (set (make-local-variable 'view-major-mode) t) | |
| 244 (setq buffer-read-only t) | |
| 245 (if clean-bs (cleanup-backspaces)) | |
| 246 (run-hooks 'view-mode-hook)) | |
| 247 | |
| 248 ;;;###autoload | |
| 249 (defun auto-view-mode () | |
| 250 "If the file of the current buffer is not writable, call view-mode. | |
| 251 This is meant to be added to `find-file-hooks'." | |
| 252 (or (file-writable-p buffer-file-name) | |
| 253 (view-minor-mode))) | |
| 254 | |
| 255 (defun view-fixup-read-only () | |
| 256 ;; doing M-x normal mode should NOT leave the buffer read-only | |
| 257 (and (boundp 'view-old-buffer-read-only) | |
| 258 (progn (setq buffer-read-only view-old-buffer-read-only) | |
| 259 (kill-local-variable 'view-old-buffer-read-only)))) | |
| 260 | |
| 261 (defun view-quit-toggle-ro () | |
| 262 "Exit view mode and execute the global binding of the key that invoked this | |
| 263 command. Normally, this will toggle the state of `buffer-read-only', perhaps | |
| 264 invoking some version-control mechanism." | |
| 444 | 265 (interactive) |
| 428 | 266 (setq view-exit-position nil) |
| 267 ;; Kludge so this works as advertised. Stig, why can't you write | |
| 268 ;; bug-free code??? | |
| 269 (let ((buffer-read-only buffer-read-only)) | |
| 270 (view-quit t)) | |
| 271 ;; no longer in view-minor-mode, so the keymap has changed... | |
| 272 (call-interactively (key-binding (this-command-keys)))) | |
| 273 | |
| 274 (defun view-quit (&optional no-exit-action) | |
| 275 "Exit view mode. With prefix argument, keep the current buffer selected." | |
| 276 (interactive "P") | |
| 277 (view-fixup-read-only) | |
| 278 (setq view-minor-mode nil) | |
| 279 (if view-exit-position (goto-char view-exit-position)) | |
| 280 (if (and (boundp 'view-major-mode) view-major-mode) | |
| 281 (fundamental-mode) | |
| 282 (let ((pbuf view-prev-buffer) | |
| 283 (exitact view-exit-action)) | |
| 284 (if no-exit-action | |
| 285 nil | |
| 286 (if exitact (funcall exitact (current-buffer))) | |
| 287 (if pbuf (switch-to-buffer pbuf)))))) | |
| 288 | |
| 289 ;; #### - similar to what's in man.el and this ought to be written in C anyway... --Stig | |
| 290 (defun cleanup-backspaces () | |
| 291 "Cleanup backspace constructions. | |
| 292 _^H and ^H_ sequences are deleted. x^Hx sequences are turned into x for all | |
| 293 characters x. ^^H| and |^H^ sequences are turned into ^. +^Ho and o^H+ are | |
| 294 turned into (+)." | |
| 295 (interactive) | |
| 296 (save-excursion | |
| 297 (goto-char (point-min)) | |
| 298 (while (= (following-char) ?\C-h) | |
| 299 (delete-char 1)) | |
| 300 (while (search-forward "\C-h" nil t) | |
| 446 | 301 (backward-char 2) |
| 428 | 302 (cond ((looking-at "_\C-h\\|\\(.\\)\C-h\\1\\||\C-h\\^") |
| 303 (delete-char 2)) | |
| 304 ((looking-at ".\C-h_\\|\\^\C-h|") | |
| 305 (forward-char 1) | |
| 306 (delete-char 2)) | |
| 307 ((looking-at "+\C-ho\\|o\C-h+") | |
| 308 (delete-char 3) | |
| 309 (insert "(+)")) | |
| 310 ((looking-at "|\C-h-") | |
| 311 (delete-char 3) | |
| 312 (insert "*")) | |
| 313 (t (forward-char 2)))))) | |
| 314 | |
| 315 (defun view-cleanup-backspaces () | |
| 316 "Cleanup backspaces and if buffer is currently unmodified, don't flag it | |
| 317 as a modified buffer. This works even if the buffer is read-only." | |
| 318 (interactive) | |
| 319 (let ((buffer-read-only) | |
| 320 (buf-mod (buffer-modified-p))) | |
| 321 (cleanup-backspaces) | |
| 322 ;; #### - THIS IS PROBABLY A REALLY DANGEROUS THING TO DO IN A MINOR MODE!! | |
| 323 (set-buffer-modified-p buf-mod))) | |
| 324 | |
| 325 ;;;###autoload | |
| 326 (defun toggle-truncate-lines (&optional p) | |
| 327 "Toggles the values of truncate-lines. | |
| 328 Positive prefix arg sets, negative disables." | |
| 329 (interactive "P") | |
| 330 (setq truncate-lines (if p | |
| 331 (> (prefix-numeric-value p) 0) | |
| 332 (not truncate-lines))) | |
| 333 (recenter)) | |
| 334 | |
| 335 (defun view-scroll-lines-up (p) | |
| 336 "Scroll up prefix-arg lines, default 1." | |
| 337 (interactive "p") | |
| 338 (scroll-up p)) | |
| 339 | |
| 340 (defun view-scroll-lines-down (p) | |
| 341 "Scroll down prefix-arg lines, default 1." | |
| 342 (interactive "p") | |
| 343 (scroll-up (- p))) | |
| 344 | |
| 345 (defun view-scroll-some-lines-down (&optional n) | |
| 346 "Scroll down prefix-arg lines, default 10, or last argument." | |
| 347 (interactive "p") | |
| 348 (if (> n 1) (setq view-default-lines n)) | |
| 349 (scroll-down view-default-lines)) | |
| 350 | |
| 351 (defun view-scroll-some-lines-up (&optional n) | |
| 352 "Scroll up prefix-arg lines, default 10, or last argument." | |
| 353 (interactive "p") | |
| 354 (if (> n 1) (setq view-default-lines n)) | |
| 355 (scroll-up view-default-lines)) | |
| 356 | |
| 357 (defun view-goto-line (&optional n) | |
| 358 "Goto prefix arg line N. N = 1 by default.." | |
| 359 (interactive "p") | |
| 360 (goto-line n)) | |
| 361 | |
| 362 (defun view-last-windowful (&optional n) | |
| 363 "Goto prefix arg line N or the first line of the last windowful in buffer." | |
| 364 (interactive "p") | |
| 365 (if current-prefix-arg | |
| 366 (goto-line n) | |
| 367 (end-of-buffer) | |
| 368 (recenter -1) | |
| 369 (move-to-window-line 0))) | |
| 370 | |
| 371 (defun view-goto-percent (&optional percent) | |
| 372 "Set mark and go to a position PERCENT way into the current buffer." | |
| 373 (interactive "p") | |
| 374 (set-mark-command nil) | |
| 375 (goto-char (+ (point-min) (/ (* percent (- (point-max) (point-min))) 100))) | |
| 376 (beginning-of-line)) | |
| 377 | |
| 378 (defun view-mode-describe () | |
| 379 (interactive) | |
| 380 (let ((mode-name "View") | |
| 381 (major-mode 'view-mode)) | |
| 382 (describe-mode))) | |
| 383 | |
| 384 (defun view-search-forward (s p) | |
| 385 "Search forward for REGEXP. If regexp is empty, use last search string. | |
| 386 With prefix ARG, search forward that many occurrences." | |
| 387 (interactive "sView search: \np") | |
| 388 (unwind-protect | |
| 444 | 389 (re-search-forward |
| 428 | 390 (if (string-equal "" s) view-search-string s) nil nil p) |
| 391 (setq view-search-arg p) | |
| 392 (or (string-equal "" s) | |
| 393 (setq view-search-string s)))) | |
| 394 | |
| 395 (defun view-search-backward (s p) | |
| 396 "Search backward for REGEXP. If regexp is empty, use last search string. | |
| 397 With prefix ARG, search forward that many occurrences." | |
| 398 (interactive "sView search backward: \np") | |
| 399 (view-search-forward s (- p))) | |
| 400 | |
| 401 (defun view-repeat-search (p) | |
| 402 "Repeat last view search command. If a prefix arg is given, use that | |
| 403 instead of the previous arg, if the prefix is just a -, then take the | |
| 404 negative of the last prefix arg." | |
| 405 (interactive "P") | |
| 406 (view-search-forward | |
| 407 view-search-string | |
| 408 (cond ((null p) view-search-arg) | |
| 409 ((eq p '-) (- view-search-arg)) | |
| 410 (t (prefix-numeric-value p))))) | |
| 411 | |
| 412 (provide 'view) | |
| 413 (provide 'view-less) | |
| 414 | |
| 415 ;;; view-less.el ends here |