code.delx.au - gnu-emacs/blob - lisp/doc-view.el

   1 ;;; doc-view.el --- View PDF/PostScript/DVI files in Emacs
   2
   3 ;; Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Tassilo Horn <tassilo@member.fsf.org>
   6 ;; Maintainer: Tassilo Horn <tassilo@member.fsf.org>
   7 ;; Keywords: files, pdf, ps, dvi
   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 3 of the License, or
  14 ;; (at your option) 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
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Requirements:
  25
  26 ;; doc-view.el requires GNU Emacs 22.1 or newer.  You also need Ghostscript,
  27 ;; `dvipdf' (comes with Ghostscript) or `dvipdfm' (comes with teTeX or TeXLive)
  28 ;; and `pdftotext', which comes with xpdf (http://www.foolabs.com/xpdf/) or
  29 ;; poppler (http://poppler.freedesktop.org/).
  30
  31 ;;; Commentary:
  32
  33 ;; DocView is a document viewer for Emacs.  It converts PDF, PS and DVI files
  34 ;; to a set of PNG files, one PNG for each page, and displays the PNG images
  35 ;; inside an Emacs buffer.  This buffer uses `doc-view-mode' which provides
  36 ;; convenient key bindings for browsing the document.
  37 ;;
  38 ;; To use it simply open a document file with
  39 ;;
  40 ;;     C-x C-f ~/path/to/document RET
  41 ;;
  42 ;; and the document will be converted and displayed, if your emacs supports png
  43 ;; images.  With `C-c C-c' you can toggle between the rendered images
  44 ;; representation and the source text representation of the document.
  45 ;;
  46 ;; Since conversion may take some time all the PNG images are cached in a
  47 ;; subdirectory of `doc-view-cache-directory' and reused when you want to view
  48 ;; that file again.  To reconvert a document hit `g' (`doc-view-reconvert-doc')
  49 ;; when displaying the document.  To delete all cached files use
  50 ;; `doc-view-clear-cache'.  To open the cache with dired, so that you can tidy
  51 ;; it out use `doc-view-dired-cache'.
  52 ;;
  53 ;; When conversion in underway the first page will be displayed as soon as it
  54 ;; is available and the available pages are refreshed every
  55 ;; `doc-view-conversion-refresh-interval' seconds.  If that variable is nil the
  56 ;; pages won't be displayed before conversion of the document finished
  57 ;; completely.
  58 ;;
  59 ;; DocView lets you select a slice of the displayed pages.  This slice will be
  60 ;; remembered and applied to all pages of the current document.  This enables
  61 ;; you to cut away the margins of a document to save some space.  To select a
  62 ;; slice you can use `doc-view-set-slice' (bound to `s s') which will query you
  63 ;; for the coordinates of the slice's top-left corner and its width and height.
  64 ;; A much more convenient way to do the same is offered by the command
  65 ;; `doc-view-set-slice-using-mouse' (bound to `s m').  After invocation you
  66 ;; only have to press mouse-1 at the top-left corner and drag it to the
  67 ;; bottom-right corner of the desired slice.  To reset the slice use
  68 ;; `doc-view-reset-slice' (bound to `s r').
  69 ;;
  70 ;; You can also search within the document.  The command `doc-view-search'
  71 ;; (bound to `C-s') queries for a search regexp and initializes a list of all
  72 ;; matching pages and messages how many match-pages were found.  After that you
  73 ;; can jump to the next page containing a match with an additional `C-s'.  With
  74 ;; `C-r' you can do the same, but backwards.  To search for a new regexp give a
  75 ;; prefix arg to one of the search functions, e.g. by typing `C-u C-s'.  The
  76 ;; searching works by using a plain text representation of the document.  If
  77 ;; that doesn't already exist the first invocation of `doc-view-search' (or
  78 ;; `doc-view-search-backward') starts the conversion.  When that finishes and
  79 ;; you're still viewing the document (i.e. you didn't switch to another buffer)
  80 ;; you're queried for the regexp then.
  81 ;;
  82 ;; Dired users can simply hit `v' on a document file.  If it's a PS, PDF or DVI
  83 ;; it will be opened using `doc-view-mode'.
  84 ;;
  85
  86 ;;; Configuration:
  87
  88 ;; If the images are too small or too big you should set the "-rXXX" option in
  89 ;; `doc-view-ghostscript-options' to another value.  (The bigger your screen,
  90 ;; the higher the value.)
  91 ;;
  92 ;; This and all other options can be set with the customization interface.
  93 ;; Simply do
  94 ;;
  95 ;;     M-x customize-group RET doc-view RET
  96 ;;
  97 ;; and modify them to your needs.
  98
  99 ;;; Todo:
 100
 101 ;; - add print command.
 102 ;; - share more code with image-mode.
 103 ;; - better menu.
 104 ;; - Bind slicing to a drag event.
 105 ;; - doc-view-fit-doc-to-window and doc-view-fit-window-to-doc?
 106 ;; - zoom the region around the cursor (like xdvi).
 107 ;; - get rid of the silly arrow in the fringe.
 108 ;; - improve anti-aliasing (pdf-utils gets it better).
 109
 110 ;;;; About isearch support
 111
 112 ;; I tried implementing isearch by setting
 113 ;; `isearch-search-fun-function' buffer-locally, but that didn't
 114 ;; work too good.  The function doing the real search was called
 115 ;; endlessly somehow.  But even if we'd get that working no real
 116 ;; isearch feeling comes up due to the missing match highlighting.
 117 ;; Currently I display all lines containing a match in a tooltip and
 118 ;; each C-s or C-r jumps directly to the next/previous page with a
 119 ;; match.  With isearch we could only display the current match.  So
 120 ;; we had to decide if another C-s jumps to the next page with a
 121 ;; match (thus only the first match in a page will be displayed in a
 122 ;; tooltip) or to the next match, which would do nothing visible
 123 ;; (except the tooltip) if the next match is on the same page.
 124
 125 ;; And it's much slower than the current search facility, because
 126 ;; isearch really searches for each step forward or backward wheras
 127 ;; the current approach searches once and then it knows to which
 128 ;; pages to jump.
 129
 130 ;; Anyway, if someone with better isearch knowledge wants to give it a try,
 131 ;; feel free to do it.  --Tassilo
 132
 133 ;;; Code:
 134
 135 (eval-when-compile (require 'cl))
 136 (require 'dired)
 137 (require 'image-mode)
 138 (require 'jka-compr)
 139
 140 ;;;; Customization Options
 141
 142 (defgroup doc-view nil
 143   "In-buffer viewer for PDF, PostScript and DVI files."
 144   :link '(function-link doc-view)
 145   :version "22.2"
 146   :group 'applications
 147   :group 'data
 148   :group 'multimedia
 149   :prefix "doc-view-")
 150
 151 (defcustom doc-view-ghostscript-program (executable-find "gs")
 152   "Program to convert PS and PDF files to PNG."
 153   :type 'file
 154   :group 'doc-view)
 155
 156 (defcustom doc-view-ghostscript-options
 157   '("-dSAFER" ;; Avoid security problems when rendering files from untrusted
 158               ;; sources.
 159     "-dNOPAUSE" "-sDEVICE=png16m" "-dTextAlphaBits=4"
 160     "-dBATCH" "-dGraphicsAlphaBits=4" "-dQUIET")
 161   "A list of options to give to ghostscript."
 162   :type '(repeat string)
 163   :group 'doc-view)
 164
 165 (defcustom doc-view-resolution 100
 166   "Dots per inch resolution used to render the documents.
 167 Higher values result in larger images."
 168   :type 'number
 169   :group 'doc-view)
 170
 171 (defcustom doc-view-image-width 850
 172   "Default image width.
 173 Has only an effect if imagemagick support is compiled into emacs."
 174   :type 'number
 175   :group 'doc-view)
 176
 177 (defcustom doc-view-dvipdfm-program (executable-find "dvipdfm")
 178   "Program to convert DVI files to PDF.
 179
 180 DVI file will be converted to PDF before the resulting PDF is
 181 converted to PNG.
 182
 183 If this and `doc-view-dvipdf-program' are set,
 184 `doc-view-dvipdf-program' will be preferred."
 185   :type 'file
 186   :group 'doc-view)
 187
 188 (defcustom doc-view-dvipdf-program (executable-find "dvipdf")
 189   "Program to convert DVI files to PDF.
 190
 191 DVI file will be converted to PDF before the resulting PDF is
 192 converted to PNG.
 193
 194 If this and `doc-view-dvipdfm-program' are set,
 195 `doc-view-dvipdf-program' will be preferred."
 196   :type 'file
 197   :group 'doc-view)
 198
 199 (defcustom doc-view-unoconv-program (executable-find "unoconv")
 200   "Program to convert any file type readable by OpenOffice.org to PDF.
 201
 202 Needed for viewing OpenOffice.org (and MS Office) files."
 203   :type 'file
 204   :group 'doc-view)
 205
 206 (defcustom doc-view-ps2pdf-program (executable-find "ps2pdf")
 207   "Program to convert PS files to PDF.
 208
 209 PS files will be converted to PDF before searching is possible."
 210   :type 'file
 211   :group 'doc-view)
 212
 213 (defcustom doc-view-pdftotext-program (executable-find "pdftotext")
 214   "Program to convert PDF files to plain text.
 215
 216 Needed for searching."
 217   :type 'file
 218   :group 'doc-view)
 219
 220 (defcustom doc-view-cache-directory
 221   (expand-file-name (format "docview%d" (user-uid))
 222                     temporary-file-directory)
 223   "The base directory, where the PNG images will be saved."
 224   :type 'directory
 225   :group 'doc-view)
 226
 227 (defvar doc-view-conversion-buffer " *doc-view conversion output*"
 228   "The buffer where messages from the converter programs go to.")
 229
 230 (defcustom doc-view-conversion-refresh-interval 1
 231   "Interval in seconds between refreshes of the DocView buffer while converting.
 232 After such a refresh newly converted pages will be available for
 233 viewing.  If set to nil there won't be any refreshes and the
 234 pages won't be displayed before conversion of the whole document
 235 has finished."
 236   :type 'integer
 237   :group 'doc-view)
 238
 239 (defcustom doc-view-continuous nil
 240   "In Continuous mode reaching the page edge advances to next/previous page.
 241 When non-nil, scrolling a line upward at the bottom edge of the page
 242 moves to the next page, and scrolling a line downward at the top edge
 243 of the page moves to the previous page."
 244   :type 'boolean
 245   :group 'doc-view
 246   :version "23.2")
 247
 248 ;;;; Internal Variables
 249
 250 (defun doc-view-new-window-function (winprops)
 251   (let ((ol (image-mode-window-get 'overlay winprops)))
 252     (when (and ol (not (overlay-buffer ol)))
 253       ;; I've seen `ol' be a dead overlay.  I do not yet know how this
 254       ;; happened, so maybe the bug is elsewhere, but in the mean time,
 255       ;; this seems like a safe approach.
 256       (setq ol nil))
 257     (if ol
 258         (progn
 259           (assert (eq (overlay-buffer ol) (current-buffer)))
 260           (setq ol (copy-overlay ol)))
 261       (assert (not (get-char-property (point-min) 'display)))
 262       (setq ol (make-overlay (point-min) (point-max) nil t))
 263       (overlay-put ol 'doc-view t))
 264     (overlay-put ol 'window (car winprops))
 265     (image-mode-window-put 'overlay ol winprops)))
 266
 267 (defvar doc-view-current-files nil
 268   "Only used internally.")
 269 (make-variable-buffer-local 'doc-view-current-files)
 270
 271 (defvar doc-view-current-converter-processes nil
 272   "Only used internally.")
 273 (make-variable-buffer-local 'doc-view-current-converter-processes)
 274
 275 (defvar doc-view-current-timer nil
 276   "Only used internally.")
 277 (make-variable-buffer-local 'doc-view-current-timer)
 278
 279 (defvar doc-view-current-cache-dir nil
 280   "Only used internally.")
 281 (make-variable-buffer-local 'doc-view-current-cache-dir)
 282
 283 (defvar doc-view-current-search-matches nil
 284   "Only used internally.")
 285 (make-variable-buffer-local 'doc-view-current-search-matches)
 286
 287 (defvar doc-view-pending-cache-flush nil
 288   "Only used internally.")
 289
 290 (defvar doc-view-previous-major-mode nil
 291   "Only used internally.")
 292
 293 (defvar doc-view-buffer-file-name nil
 294   "Only used internally.
 295 The file name used for conversion.  Normally it's the same as
 296 `buffer-file-name', but for remote files, compressed files and
 297 files inside an archive it is a temporary copy of
 298 the (uncompressed, extracted) file residing in
 299 `doc-view-cache-directory'.")
 300
 301 (defvar doc-view-doc-type nil
 302   "The type of document in the current buffer.
 303 Can be `dvi', `pdf', or `ps'.")
 304
 305 ;;;; DocView Keymaps
 306
 307 (defvar doc-view-mode-map
 308   (let ((map (make-sparse-keymap)))
 309     (set-keymap-parent map image-mode-map)
 310     ;; Navigation in the document
 311     (define-key map (kbd "n")         'doc-view-next-page)
 312     (define-key map (kbd "p")         'doc-view-previous-page)
 313     (define-key map (kbd "<next>")    'forward-page)
 314     (define-key map (kbd "<prior>")   'backward-page)
 315     (define-key map [remap forward-page]  'doc-view-next-page)
 316     (define-key map [remap backward-page] 'doc-view-previous-page)
 317     (define-key map (kbd "SPC")       'doc-view-scroll-up-or-next-page)
 318     (define-key map (kbd "DEL")       'doc-view-scroll-down-or-previous-page)
 319     (define-key map (kbd "C-n")       'doc-view-next-line-or-next-page)
 320     (define-key map (kbd "<down>")    'doc-view-next-line-or-next-page)
 321     (define-key map (kbd "C-p")       'doc-view-previous-line-or-previous-page)
 322     (define-key map (kbd "<up>")      'doc-view-previous-line-or-previous-page)
 323     (define-key map (kbd "M-<")       'doc-view-first-page)
 324     (define-key map (kbd "M->")       'doc-view-last-page)
 325     (define-key map [remap goto-line] 'doc-view-goto-page)
 326     (define-key map (kbd "RET")       'image-next-line)
 327     ;; Zoom in/out.
 328     (define-key map "+"               'doc-view-enlarge)
 329     (define-key map "-"               'doc-view-shrink)
 330     ;; Killing the buffer (and the process)
 331     (define-key map (kbd "k")         'doc-view-kill-proc-and-buffer)
 332     (define-key map (kbd "K")         'doc-view-kill-proc)
 333     ;; Slicing the image
 334     (define-key map (kbd "s s")       'doc-view-set-slice)
 335     (define-key map (kbd "s m")       'doc-view-set-slice-using-mouse)
 336     (define-key map (kbd "s r")       'doc-view-reset-slice)
 337     ;; Searching
 338     (define-key map (kbd "C-s")       'doc-view-search)
 339     (define-key map (kbd "<find>")    'doc-view-search)
 340     (define-key map (kbd "C-r")       'doc-view-search-backward)
 341     ;; Show the tooltip
 342     (define-key map (kbd "C-t")       'doc-view-show-tooltip)
 343     ;; Toggle between text and image display or editing
 344     (define-key map (kbd "C-c C-c")   'doc-view-toggle-display)
 345     ;; Open a new buffer with doc's text contents
 346     (define-key map (kbd "C-c C-t")   'doc-view-open-text)
 347     ;; Reconvert the current document.  Don't just use revert-buffer
 348     ;; because that resets the scale factor, the page number, ...
 349     (define-key map (kbd "g")         'doc-view-revert-buffer)
 350     (define-key map (kbd "r")         'doc-view-revert-buffer)
 351     map)
 352   "Keymap used by `doc-view-mode' when displaying a doc as a set of images.")
 353
 354 (defun doc-view-revert-buffer (&optional ignore-auto noconfirm)
 355   "Like `revert-buffer', but preserves the buffer's current modes."
 356   ;; FIXME: this should probably be moved to files.el and used for
 357   ;; most/all "g" bindings to revert-buffer.
 358   (interactive (list (not current-prefix-arg)))
 359   (revert-buffer ignore-auto noconfirm 'preserve-modes))
 360
 361
 362 (easy-menu-define doc-view-menu doc-view-mode-map
 363   "Menu for Doc View mode."
 364   '("DocView"
 365     ["Toggle display"           doc-view-toggle-display]
 366     ("Continuous"
 367      ["Off"                     (setq doc-view-continuous nil)
 368       :style radio :selected    (eq doc-view-continuous nil)]
 369      ["On"                      (setq doc-view-continuous t)
 370       :style radio :selected    (eq doc-view-continuous t)]
 371      "---"
 372      ["Save as Default"
 373       (customize-save-variable 'doc-view-continuous doc-view-continuous) t]
 374      )
 375     "---"
 376     ["Set Slice"                doc-view-set-slice-using-mouse]
 377     ["Set Slice (manual)"       doc-view-set-slice]
 378     ["Reset Slice"              doc-view-reset-slice]
 379     "---"
 380     ["Search"                   doc-view-search]
 381     ["Search Backwards"         doc-view-search-backward]
 382     ))
 383
 384 (defvar doc-view-minor-mode-map
 385   (let ((map (make-sparse-keymap)))
 386     ;; Toggle between text and image display or editing
 387     (define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
 388     map)
 389   "Keymap used by `doc-minor-view-mode'.")
 390
 391 ;;;; Navigation Commands
 392
 393 (defmacro doc-view-current-page (&optional win)
 394   `(image-mode-window-get 'page ,win))
 395 (defmacro doc-view-current-info () `(image-mode-window-get 'info))
 396 (defmacro doc-view-current-overlay () `(image-mode-window-get 'overlay))
 397 (defmacro doc-view-current-image () `(image-mode-window-get 'image))
 398 (defmacro doc-view-current-slice () `(image-mode-window-get 'slice))
 399
 400 (defun doc-view-last-page-number ()
 401   (length doc-view-current-files))
 402
 403 (defun doc-view-goto-page (page)
 404   "View the page given by PAGE."
 405   (interactive "nPage: ")
 406   (let ((len (doc-view-last-page-number))
 407         (hscroll (window-hscroll)))
 408     (if (< page 1)
 409         (setq page 1)
 410       (when (and (> page len)
 411                  ;; As long as the converter is running, we don't know
 412                  ;; how many pages will be available.
 413                  (null doc-view-current-converter-processes))
 414         (setq page len)))
 415     (setf (doc-view-current-page) page
 416           (doc-view-current-info)
 417           (concat
 418            (propertize
 419             (format "Page %d of %d." page len) 'face 'bold)
 420            ;; Tell user if converting isn't finished yet
 421            (if doc-view-current-converter-processes
 422                " (still converting...)\n"
 423              "\n")
 424            ;; Display context infos if this page matches the last search
 425            (when (and doc-view-current-search-matches
 426                       (assq page doc-view-current-search-matches))
 427              (concat (propertize "Search matches:\n" 'face 'bold)
 428                      (let ((contexts ""))
 429                        (dolist (m (cdr (assq page
 430                                              doc-view-current-search-matches)))
 431                          (setq contexts (concat contexts "  - \"" m "\"\n")))
 432                        contexts)))))
 433     ;; Update the buffer
 434     ;; We used to find the file name from doc-view-current-files but
 435     ;; that's not right if the pages are not generated sequentially
 436     ;; or if the page isn't in doc-view-current-files yet.
 437     (let ((file (expand-file-name (format "page-%d.png" page)
 438                                   (doc-view-current-cache-dir))))
 439       (doc-view-insert-image file :pointer 'arrow)
 440       (set-window-hscroll (selected-window) hscroll)
 441       (when (and (not (file-exists-p file))
 442                  doc-view-current-converter-processes)
 443         ;; The PNG file hasn't been generated yet.
 444         (doc-view-pdf->png-1 doc-view-buffer-file-name file page
 445                              (lexical-let ((page page)
 446                                            (win (selected-window))
 447                                            (file file))
 448                                (lambda ()
 449                                  (and (eq (current-buffer) (window-buffer win))
 450                                       ;; If we changed page in the mean
 451                                       ;; time, don't mess things up.
 452                                       (eq (doc-view-current-page win) page)
 453                                       ;; Make sure we don't infloop.
 454                                       (file-readable-p file)
 455                                       (with-selected-window win
 456                                         (doc-view-goto-page page))))))))
 457     (overlay-put (doc-view-current-overlay)
 458                  'help-echo (doc-view-current-info))))
 459
 460 (defun doc-view-next-page (&optional arg)
 461   "Browse ARG pages forward."
 462   (interactive "p")
 463   (doc-view-goto-page (+ (doc-view-current-page) (or arg 1))))
 464
 465 (defun doc-view-previous-page (&optional arg)
 466   "Browse ARG pages backward."
 467   (interactive "p")
 468   (doc-view-goto-page (- (doc-view-current-page) (or arg 1))))
 469
 470 (defun doc-view-first-page ()
 471   "View the first page."
 472   (interactive)
 473   (doc-view-goto-page 1))
 474
 475 (defun doc-view-last-page ()
 476   "View the last page."
 477   (interactive)
 478   (doc-view-goto-page (doc-view-last-page-number)))
 479
 480 (defun doc-view-scroll-up-or-next-page (&optional arg)
 481   "Scroll page up ARG lines if possible, else goto next page.
 482 When `doc-view-continuous' is non-nil, scrolling upward
 483 at the bottom edge of the page moves to the next page.
 484 Otherwise, goto next page only on typing SPC (ARG is nil)."
 485   (interactive "P")
 486   (if (or doc-view-continuous (null arg))
 487       (let ((hscroll (window-hscroll))
 488             (cur-page (doc-view-current-page)))
 489         (when (= (window-vscroll) (image-scroll-up arg))
 490           (doc-view-next-page)
 491           (when (/= cur-page (doc-view-current-page))
 492             (image-bob)
 493             (image-bol 1))
 494           (set-window-hscroll (selected-window) hscroll)))
 495     (image-scroll-up arg)))
 496
 497 (defun doc-view-scroll-down-or-previous-page (&optional arg)
 498   "Scroll page down ARG lines if possible, else goto previous page.
 499 When `doc-view-continuous' is non-nil, scrolling downward
 500 at the top edge of the page moves to the previous page.
 501 Otherwise, goto previous page only on typing DEL (ARG is nil)."
 502   (interactive "P")
 503   (if (or doc-view-continuous (null arg))
 504       (let ((hscroll (window-hscroll))
 505             (cur-page (doc-view-current-page)))
 506         (when (= (window-vscroll) (image-scroll-down arg))
 507           (doc-view-previous-page)
 508           (when (/= cur-page (doc-view-current-page))
 509             (image-eob)
 510             (image-bol 1))
 511           (set-window-hscroll (selected-window) hscroll)))
 512     (image-scroll-down arg)))
 513
 514 (defun doc-view-next-line-or-next-page (&optional arg)
 515   "Scroll upward by ARG lines if possible, else goto next page.
 516 When `doc-view-continuous' is non-nil, scrolling a line upward
 517 at the bottom edge of the page moves to the next page."
 518   (interactive "p")
 519   (if doc-view-continuous
 520       (let ((hscroll (window-hscroll))
 521             (cur-page (doc-view-current-page)))
 522         (when (= (window-vscroll) (image-next-line arg))
 523           (doc-view-next-page)
 524           (when (/= cur-page (doc-view-current-page))
 525             (image-bob)
 526             (image-bol 1))
 527           (set-window-hscroll (selected-window) hscroll)))
 528     (image-next-line 1)))
 529
 530 (defun doc-view-previous-line-or-previous-page (&optional arg)
 531   "Scroll downward by ARG lines if possible, else goto previous page.
 532 When `doc-view-continuous' is non-nil, scrolling a line downward
 533 at the top edge of the page moves to the previous page."
 534   (interactive "p")
 535   (if doc-view-continuous
 536       (let ((hscroll (window-hscroll))
 537             (cur-page (doc-view-current-page)))
 538         (when (= (window-vscroll) (image-previous-line arg))
 539           (doc-view-previous-page)
 540           (when (/= cur-page (doc-view-current-page))
 541             (image-eob)
 542             (image-bol 1))
 543           (set-window-hscroll (selected-window) hscroll)))
 544     (image-previous-line arg)))
 545
 546 ;;;; Utility Functions
 547
 548 (defun doc-view-kill-proc ()
 549   "Kill the current converter process(es)."
 550   (interactive)
 551   (while (consp doc-view-current-converter-processes)
 552     (ignore-errors ;; Maybe it's dead already?
 553       (kill-process (pop doc-view-current-converter-processes))))
 554   (when doc-view-current-timer
 555     (cancel-timer doc-view-current-timer)
 556     (setq doc-view-current-timer nil))
 557   (setq mode-line-process nil))
 558
 559 (defun doc-view-kill-proc-and-buffer ()
 560   "Kill the current converter process and buffer."
 561   (interactive)
 562   (doc-view-kill-proc)
 563   (when (eq major-mode 'doc-view-mode)
 564     (kill-buffer (current-buffer))))
 565
 566 (defun doc-view-make-safe-dir (dir)
 567   (condition-case nil
 568       (let ((umask (default-file-modes)))
 569         (unwind-protect
 570             (progn
 571               ;; Create temp files with strict access rights.  It's easy to
 572               ;; loosen them later, whereas it's impossible to close the
 573               ;; time-window of loose permissions otherwise.
 574               (set-default-file-modes #o0700)
 575               (make-directory dir))
 576           ;; Reset the umask.
 577           (set-default-file-modes umask)))
 578     (file-already-exists
 579      (if (file-symlink-p dir)
 580          (error "Danger: %s points to a symbolic link" dir))
 581      ;; In case it was created earlier with looser rights.
 582      ;; We could check the mode info returned by file-attributes, but it's
 583      ;; a pain to parse and it may not tell you what we want under
 584      ;; non-standard file-systems.  So let's just say what we want and let
 585      ;; the underlying C code and file-system figure it out.
 586      ;; This also ends up checking a bunch of useful conditions: it makes
 587      ;; sure we have write-access to the directory and that we own it, thus
 588      ;; closing a bunch of security holes.
 589      (set-file-modes dir #o0700))))
 590
 591 (defun doc-view-current-cache-dir ()
 592   "Return the directory where the png files of the current doc should be saved.
 593 It's a subdirectory of `doc-view-cache-directory'."
 594   (if doc-view-current-cache-dir
 595       doc-view-current-cache-dir
 596     ;; Try and make sure doc-view-cache-directory exists and is safe.
 597     (doc-view-make-safe-dir doc-view-cache-directory)
 598     ;; Now compute the subdirectory to use.
 599     (setq doc-view-current-cache-dir
 600           (file-name-as-directory
 601            (expand-file-name
 602             (concat (file-name-nondirectory doc-view-buffer-file-name)
 603                     "-"
 604                     (let ((file doc-view-buffer-file-name))
 605                       (with-temp-buffer
 606                         (set-buffer-multibyte nil)
 607                         (insert-file-contents-literally file)
 608                         (md5 (current-buffer)))))
 609             doc-view-cache-directory)))))
 610
 611 (defun doc-view-remove-if (predicate list)
 612   "Return LIST with all items removed that satisfy PREDICATE."
 613   (let (new-list)
 614     (dolist (item list (nreverse new-list))
 615       (when (not (funcall predicate item))
 616         (setq new-list (cons item new-list))))))
 617
 618 ;;;###autoload
 619 (defun doc-view-mode-p (type)
 620   "Return non-nil if document type TYPE is available for `doc-view'.
 621 Document types are symbols like `dvi', `ps', `pdf', or `odf' (any
 622 OpenDocument format)."
 623   (and (display-graphic-p)
 624        (or (image-type-available-p 'imagemagick)
 625            (image-type-available-p 'png))
 626        (cond
 627         ((eq type 'dvi)
 628          (and (doc-view-mode-p 'pdf)
 629               (or (and doc-view-dvipdf-program
 630                        (executable-find doc-view-dvipdf-program))
 631                   (and doc-view-dvipdfm-program
 632                        (executable-find doc-view-dvipdfm-program)))))
 633         ((or (eq type 'postscript) (eq type 'ps) (eq type 'eps)
 634              (eq type 'pdf))
 635          (and doc-view-ghostscript-program
 636               (executable-find doc-view-ghostscript-program)))
 637         ((eq type 'odf)
 638          (and doc-view-unoconv-program
 639               (executable-find doc-view-unoconv-program)
 640               (doc-view-mode-p 'pdf)))
 641         (t ;; unknown image type
 642          nil))))
 643
 644 ;;;; Conversion Functions
 645
 646 (defvar doc-view-shrink-factor 1.125)
 647
 648 (defun doc-view-enlarge (factor)
 649   "Enlarge the document."
 650   (interactive (list doc-view-shrink-factor))
 651   (if (eq (plist-get (cdr (doc-view-current-image)) :type)
 652           'imagemagick)
 653       ;; ImageMagick supports on-the-fly-rescaling
 654       (progn
 655         (set (make-local-variable 'doc-view-image-width)
 656              (ceiling (* factor doc-view-image-width)))
 657         (doc-view-insert-image (plist-get (cdr (doc-view-current-image)) :file)
 658                                :width doc-view-image-width))
 659     (set (make-local-variable 'doc-view-resolution)
 660          (ceiling (* factor doc-view-resolution)))
 661     (doc-view-reconvert-doc)))
 662
 663 (defun doc-view-shrink (factor)
 664   "Shrink the document."
 665   (interactive (list doc-view-shrink-factor))
 666   (doc-view-enlarge (/ 1.0 factor)))
 667
 668 (defun doc-view-reconvert-doc ()
 669   "Reconvert the current document.
 670 Should be invoked when the cached images aren't up-to-date."
 671   (interactive)
 672   (doc-view-kill-proc)
 673   ;; Clear the old cached files
 674   (when (file-exists-p (doc-view-current-cache-dir))
 675     (delete-directory (doc-view-current-cache-dir) 'recursive))
 676   (doc-view-initiate-display))
 677
 678 (defun doc-view-sentinel (proc event)
 679   "Generic sentinel for doc-view conversion processes."
 680   (if (not (string-match "finished" event))
 681       (message "DocView: process %s changed status to %s."
 682                (process-name proc)
 683                (if (string-match "\\(.+\\)\n?\\'" event)
 684                    (match-string 1 event)
 685                  event))
 686     (when (buffer-live-p (process-get proc 'buffer))
 687       (with-current-buffer (process-get proc 'buffer)
 688         (setq doc-view-current-converter-processes
 689               (delq proc doc-view-current-converter-processes))
 690         (setq mode-line-process
 691               (if doc-view-current-converter-processes
 692                   (format ":%s" (car doc-view-current-converter-processes))))
 693         (funcall (process-get proc 'callback))))))
 694
 695 (defun doc-view-start-process (name program args callback)
 696   ;; Make sure the process is started in an existing directory, (rather than
 697   ;; some file-name-handler-managed dir, for example).
 698   (let* ((default-directory (if (file-readable-p default-directory)
 699                                 default-directory
 700                               (expand-file-name "~/")))
 701          (proc (apply 'start-process name doc-view-conversion-buffer
 702                       program args)))
 703     (push proc doc-view-current-converter-processes)
 704     (setq mode-line-process (list (format ":%s" proc)))
 705     (set-process-sentinel proc 'doc-view-sentinel)
 706     (process-put proc 'buffer   (current-buffer))
 707     (process-put proc 'callback callback)))
 708
 709 (defun doc-view-dvi->pdf (dvi pdf callback)
 710   "Convert DVI to PDF asynchronously and call CALLBACK when finished."
 711   ;; Prefer dvipdf over dvipdfm, because the latter has problems if the DVI
 712   ;; references and includes other PS files.
 713   (if (and doc-view-dvipdf-program
 714            (executable-find doc-view-dvipdf-program))
 715       (doc-view-start-process "dvi->pdf" doc-view-dvipdf-program
 716                             (list dvi pdf)
 717                             callback)
 718     (doc-view-start-process "dvi->pdf" doc-view-dvipdfm-program
 719                             (list "-o" pdf dvi)
 720                             callback)))
 721
 722 (defun doc-view-odf->pdf (odf callback)
 723   "Convert ODF to PDF asynchronously and call CALLBACK when finished.
 724 The converted PDF is put into the current cache directory, and it
 725 is named like ODF with the extension turned to pdf."
 726   (doc-view-start-process "odf->pdf" doc-view-unoconv-program
 727                           (list "-f" "pdf" "-o" (doc-view-current-cache-dir) odf)
 728                           callback))
 729
 730 (defun doc-view-pdf/ps->png (pdf-ps png)
 731   "Convert PDF-PS to PNG asynchronously."
 732   (doc-view-start-process
 733    "pdf/ps->png" doc-view-ghostscript-program
 734    (append doc-view-ghostscript-options
 735            (list (format "-r%d" (round doc-view-resolution))
 736                  (concat "-sOutputFile=" png)
 737                  pdf-ps))
 738    (lexical-let ((resolution doc-view-resolution))
 739      (lambda ()
 740        ;; Only create the resolution file when it's all done, so it also
 741        ;; serves as a witness that the conversion is complete.
 742        (write-region (prin1-to-string resolution) nil
 743                      (expand-file-name "resolution.el"
 744                                        (doc-view-current-cache-dir))
 745                      nil 'silently)
 746        (when doc-view-current-timer
 747          (cancel-timer doc-view-current-timer)
 748          (setq doc-view-current-timer nil))
 749        (doc-view-display (current-buffer) 'force))))
 750   ;; Update the displayed pages as soon as they're done generating.
 751   (when doc-view-conversion-refresh-interval
 752     (setq doc-view-current-timer
 753           (run-at-time "1 secs" doc-view-conversion-refresh-interval
 754                        'doc-view-display
 755                        (current-buffer)))))
 756
 757 (defun doc-view-pdf->png-1 (pdf png page callback)
 758   "Convert a PAGE of a PDF file to PNG asynchronously.
 759 Call CALLBACK with no arguments when done."
 760   (doc-view-start-process
 761    "pdf->png-1" doc-view-ghostscript-program
 762    (append doc-view-ghostscript-options
 763            (list (format "-r%d" (round doc-view-resolution))
 764                  ;; Sadly, `gs' only supports the page-range
 765                  ;; for PDF files.
 766                  (format "-dFirstPage=%d" page)
 767                  (format "-dLastPage=%d" page)
 768                  (concat "-sOutputFile=" png)
 769                  pdf))
 770    callback))
 771
 772 (declare-function clear-image-cache "image.c" (&optional filter))
 773
 774 (defun doc-view-pdf->png (pdf png pages)
 775   "Convert a PDF file to PNG asynchronously.
 776 Start by converting PAGES, and then the rest."
 777   (if (null pages)
 778       (doc-view-pdf/ps->png pdf png)
 779     ;; We could render several `pages' with a single process if they're
 780     ;; (almost) consecutive, but since in 99% of the cases, there'll be only
 781     ;; a single page anyway, and of the remaining 1%, few cases will have
 782     ;; consecutive pages, it's not worth the trouble.
 783     (lexical-let ((pdf pdf) (png png) (rest (cdr pages)))
 784       (doc-view-pdf->png-1
 785        pdf (format png (car pages)) (car pages)
 786        (lambda ()
 787          (if rest
 788              (doc-view-pdf->png pdf png rest)
 789            ;; Yippie, the important pages are done, update the display.
 790            (clear-image-cache)
 791            ;; For the windows that have a message (like "Welcome to
 792            ;; DocView") display property, clearing the image cache is
 793            ;; not sufficient.
 794            (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
 795              (with-selected-window win
 796                (when (stringp (get-char-property (point-min) 'display))
 797                  (doc-view-goto-page (doc-view-current-page)))))
 798            ;; Convert the rest of the pages.
 799            (doc-view-pdf/ps->png pdf png)))))))
 800
 801 (defun doc-view-pdf->txt (pdf txt callback)
 802   "Convert PDF to TXT asynchronously and call CALLBACK when finished."
 803   (or doc-view-pdftotext-program
 804       (error "You need the `pdftotext' program to convert a PDF to text"))
 805   (doc-view-start-process "pdf->txt" doc-view-pdftotext-program
 806                           (list "-raw" pdf txt)
 807                           callback))
 808
 809 (defun doc-view-doc->txt (txt callback)
 810   "Convert the current document to text and call CALLBACK when done."
 811   (make-directory (doc-view-current-cache-dir) t)
 812   (case doc-view-doc-type
 813     (pdf
 814      ;; Doc is a PDF, so convert it to TXT
 815      (doc-view-pdf->txt doc-view-buffer-file-name txt callback))
 816     (ps
 817      ;; Doc is a PS, so convert it to PDF (which will be converted to
 818      ;; TXT thereafter).
 819      (lexical-let ((pdf (expand-file-name "doc.pdf"
 820                                           (doc-view-current-cache-dir)))
 821                    (txt txt)
 822                    (callback callback))
 823        (doc-view-ps->pdf doc-view-buffer-file-name pdf
 824                          (lambda () (doc-view-pdf->txt pdf txt callback)))))
 825     (dvi
 826      ;; Doc is a DVI.  This means that a doc.pdf already exists in its
 827      ;; cache subdirectory.
 828      (doc-view-pdf->txt (expand-file-name "doc.pdf"
 829                                           (doc-view-current-cache-dir))
 830                         txt callback))
 831     (odf
 832      ;; Doc is some ODF (or MS Office) doc.  This means that a doc.pdf
 833      ;; already exists in its cache subdirectory.
 834      (doc-view-pdf->txt (expand-file-name "doc.pdf"
 835                                           (doc-view-current-cache-dir))
 836                         txt callback))
 837     (t (error "DocView doesn't know what to do"))))
 838
 839 (defun doc-view-ps->pdf (ps pdf callback)
 840   "Convert PS to PDF asynchronously and call CALLBACK when finished."
 841   (or doc-view-ps2pdf-program
 842       (error "You need the `ps2pdf' program to convert PS to PDF"))
 843   (doc-view-start-process "ps->pdf" doc-view-ps2pdf-program
 844                           (list
 845                            ;; Avoid security problems when rendering files from
 846                            ;; untrusted sources.
 847                            "-dSAFER"
 848                            ;; in-file and out-file
 849                            ps pdf)
 850                           callback))
 851
 852 (defun doc-view-active-pages ()
 853   (let ((pages ()))
 854     (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
 855       (let ((page (image-mode-window-get 'page win)))
 856         (unless (memq page pages) (push page pages))))
 857     pages))
 858
 859 (defun doc-view-convert-current-doc ()
 860   "Convert `doc-view-buffer-file-name' to a set of png files, one file per page.
 861 Those files are saved in the directory given by the function
 862 `doc-view-current-cache-dir'."
 863   ;; Let stale files still display while we recompute the new ones, so only
 864   ;; flush the cache when the conversion is over.  One of the reasons why it
 865   ;; is important to keep displaying the stale page is so that revert-buffer
 866   ;; preserves the horizontal/vertical scroll settings (which are otherwise
 867   ;; resets during the redisplay).
 868   (setq doc-view-pending-cache-flush t)
 869   (let ((png-file (expand-file-name "page-%d.png"
 870                                     (doc-view-current-cache-dir))))
 871     (make-directory (doc-view-current-cache-dir) t)
 872     (case doc-view-doc-type
 873       (dvi
 874        ;; DVI files have to be converted to PDF before Ghostscript can process
 875        ;; it.
 876        (lexical-let
 877            ((pdf (expand-file-name "doc.pdf" doc-view-current-cache-dir))
 878             (png-file png-file))
 879          (doc-view-dvi->pdf doc-view-buffer-file-name pdf
 880                             (lambda () (doc-view-pdf/ps->png pdf png-file)))))
 881       (odf
 882        ;; ODF files have to be converted to PDF before Ghostscript can
 883        ;; process it.
 884        (lexical-let
 885            ((pdf (expand-file-name "doc.pdf" doc-view-current-cache-dir))
 886             (opdf (expand-file-name (concat (file-name-sans-extension
 887                                              (file-name-nondirectory doc-view-buffer-file-name))
 888                                             ".pdf")
 889                                     doc-view-current-cache-dir))
 890             (png-file png-file))
 891          ;; The unoconv tool only supports a output directory, but no
 892          ;; file name.  It's named like the input file with the
 893          ;; extension replaced by pdf.
 894          (doc-view-odf->pdf doc-view-buffer-file-name
 895                             (lambda ()
 896                               ;; Rename to doc.pdf
 897                               (rename-file opdf pdf)
 898                               (doc-view-pdf/ps->png pdf png-file)))))
 899       (pdf
 900        (let ((pages (doc-view-active-pages)))
 901          ;; Convert PDF to PNG images starting with the active pages.
 902          (doc-view-pdf->png doc-view-buffer-file-name png-file pages)))
 903       (t
 904        ;; Convert to PNG images.
 905        (doc-view-pdf/ps->png doc-view-buffer-file-name png-file)))))
 906
 907 ;;;; Slicing
 908
 909 (declare-function image-size "image.c" (spec &optional pixels frame))
 910
 911 (defun doc-view-set-slice (x y width height)
 912   "Set the slice of the images that should be displayed.
 913 You can use this function to tell doc-view not to display the
 914 margins of the document.  It prompts for the top-left corner (X
 915 and Y) of the slice to display and its WIDTH and HEIGHT.
 916
 917 See `doc-view-set-slice-using-mouse' for a more convenient way to
 918 do that.  To reset the slice use `doc-view-reset-slice'."
 919   (interactive
 920    (let* ((size (image-size (doc-view-current-image) t))
 921           (a (read-number (format "Top-left X (0..%d): " (car size))))
 922           (b (read-number (format "Top-left Y (0..%d): " (cdr size))))
 923           (c (read-number (format "Width (0..%d): " (- (car size) a))))
 924           (d (read-number (format "Height (0..%d): " (- (cdr size) b)))))
 925      (list a b c d)))
 926   (setf (doc-view-current-slice) (list x y width height))
 927   ;; Redisplay
 928   (doc-view-goto-page (doc-view-current-page)))
 929
 930 (defun doc-view-set-slice-using-mouse ()
 931   "Set the slice of the images that should be displayed.
 932 You set the slice by pressing mouse-1 at its top-left corner and
 933 dragging it to its bottom-right corner.  See also
 934 `doc-view-set-slice' and `doc-view-reset-slice'."
 935   (interactive)
 936   (let (x y w h done)
 937     (while (not done)
 938       (let ((e (read-event
 939                 (concat "Press mouse-1 at the top-left corner and "
 940                         "drag it to the bottom-right corner!"))))
 941         (when (eq (car e) 'drag-mouse-1)
 942           (setq x (car (posn-object-x-y (event-start e))))
 943           (setq y (cdr (posn-object-x-y (event-start e))))
 944           (setq w (- (car (posn-object-x-y (event-end e))) x))
 945           (setq h (- (cdr (posn-object-x-y (event-end e))) y))
 946           (setq done t))))
 947     (doc-view-set-slice x y w h)))
 948
 949 (defun doc-view-reset-slice ()
 950   "Reset the current slice.
 951 After calling this function whole pages will be visible again."
 952   (interactive)
 953   (setf (doc-view-current-slice) nil)
 954   ;; Redisplay
 955   (doc-view-goto-page (doc-view-current-page)))
 956
 957 ;;;; Display
 958
 959 (defun doc-view-insert-image (file &rest args)
 960   "Insert the given png FILE.
 961 ARGS is a list of image descriptors."
 962   (when doc-view-pending-cache-flush
 963     (clear-image-cache)
 964     (setq doc-view-pending-cache-flush nil))
 965   (let ((ol (doc-view-current-overlay))
 966         (image (if (and file (file-readable-p file))
 967                    (if (not (fboundp 'imagemagick-types))
 968                        (apply 'create-image file 'png nil args)
 969                      (unless (member :width args)
 970                        (setq args (append args (list :width doc-view-image-width))))
 971                      (apply 'create-image file 'imagemagick nil args))))
 972         (slice (doc-view-current-slice)))
 973     (setf (doc-view-current-image) image)
 974     (move-overlay ol (point-min) (point-max))
 975     (overlay-put ol 'display
 976                  (cond
 977                   (image
 978                    (if slice
 979                        (list (cons 'slice slice) image)
 980                      image))
 981                   ;; We're trying to display a page that doesn't exist.
 982                   (doc-view-current-converter-processes
 983                    ;; Maybe the page doesn't exist *yet*.
 984                    "Cannot display this page (yet)!")
 985                   (t
 986                    ;; Typically happens if the conversion process somehow
 987                    ;; failed.  Better not signal an error here because it
 988                    ;; could prevent a subsequent reconversion from fixing
 989                    ;; the problem.
 990                    (concat "Cannot display this page!\n"
 991                            "Maybe because of a conversion failure!"))))
 992     (let ((win (overlay-get ol 'window)))
 993       (if (stringp (overlay-get ol 'display))
 994           (progn            ;Make sure the text is not scrolled out of view.
 995             (set-window-hscroll win 0)
 996             (set-window-vscroll win 0))
 997         (let ((hscroll (image-mode-window-get 'hscroll win))
 998               (vscroll (image-mode-window-get 'vscroll win)))
 999           ;; Reset scroll settings, in case they were changed.
1000           (if hscroll (set-window-hscroll win hscroll))
1001           (if vscroll (set-window-vscroll win vscroll)))))))
1002
1003 (defun doc-view-sort (a b)
1004   "Return non-nil if A should be sorted before B.
1005 Predicate for sorting `doc-view-current-files'."
1006   (or (< (length a) (length b))
1007       (and (= (length a) (length b))
1008            (string< a b))))
1009
1010 (defun doc-view-display (buffer &optional force)
1011   "Start viewing the document in BUFFER.
1012 If FORCE is non-nil, start viewing even if the document does not
1013 have the page we want to view."
1014   (with-current-buffer buffer
1015     (let ((prev-pages doc-view-current-files))
1016       (setq doc-view-current-files
1017             (sort (directory-files (doc-view-current-cache-dir) t
1018                                    "page-[0-9]+\\.png" t)
1019                   'doc-view-sort))
1020       (dolist (win (or (get-buffer-window-list buffer nil t)
1021                        (list (selected-window))))
1022         (let* ((page (doc-view-current-page win))
1023                (pagefile (expand-file-name (format "page-%d.png" page)
1024                                            (doc-view-current-cache-dir))))
1025           (when (or force
1026                     (and (not (member pagefile prev-pages))
1027                          (member pagefile doc-view-current-files)))
1028             (with-selected-window win
1029               (assert (eq (current-buffer) buffer))
1030               (doc-view-goto-page page))))))))
1031
1032 (defun doc-view-buffer-message ()
1033   ;; Only show this message initially, not when refreshing the buffer (in which
1034   ;; case it's better to keep displaying the "stale" page while computing
1035   ;; the fresh new ones).
1036   (unless (overlay-get (doc-view-current-overlay) 'display)
1037     (overlay-put (doc-view-current-overlay) 'display
1038                  (concat (propertize "Welcome to DocView!" 'face 'bold)
1039                          "\n"
1040                          "
1041 If you see this buffer it means that the document you want to view is being
1042 converted to PNG and the conversion of the first page hasn't finished yet or
1043 `doc-view-conversion-refresh-interval' is set to nil.
1044
1045 For now these keys are useful:
1046
1047 `q' : Bury this buffer.  Conversion will go on in background.
1048 `k' : Kill the conversion process and this buffer.
1049 `K' : Kill the conversion process.\n"))))
1050
1051 (declare-function tooltip-show "tooltip" (text &optional use-echo-area))
1052
1053 (defun doc-view-show-tooltip ()
1054   (interactive)
1055   (tooltip-show (doc-view-current-info)))
1056
1057 (defun doc-view-open-text ()
1058   "Open a buffer with the current doc's contents as text."
1059   (interactive)
1060   (if doc-view-current-converter-processes
1061       (message "DocView: please wait till conversion finished.")
1062     (let ((txt (expand-file-name "doc.txt" (doc-view-current-cache-dir))))
1063       (if (file-readable-p txt)
1064           (let ((name (concat "Text contents of "
1065                               (file-name-nondirectory buffer-file-name)))
1066                 (dir (file-name-directory buffer-file-name)))
1067             (with-current-buffer (find-file txt)
1068               (rename-buffer name)
1069               (setq default-directory dir)))
1070         (doc-view-doc->txt txt 'doc-view-open-text)))))
1071
1072 ;;;;; Toggle between editing and viewing
1073
1074 (defun doc-view-toggle-display ()
1075   "Toggle between editing a document as text or viewing it."
1076   (interactive)
1077   (if (eq major-mode 'doc-view-mode)
1078       ;; Switch to editing mode
1079       (progn
1080         (doc-view-kill-proc)
1081         (setq buffer-read-only nil)
1082         (remove-overlays (point-min) (point-max) 'doc-view t)
1083         (set (make-local-variable 'image-mode-winprops-alist) t)
1084         ;; Switch to the previously used major mode or fall back to
1085         ;; normal mode.
1086         (doc-view-fallback-mode)
1087         (doc-view-minor-mode 1))
1088     ;; Switch to doc-view-mode
1089     (when (and (buffer-modified-p)
1090                (y-or-n-p "The buffer has been modified.  Save the changes? "))
1091       (save-buffer))
1092     (doc-view-mode)))
1093
1094 ;;;; Searching
1095
1096
1097 (defun doc-view-search-internal (regexp file)
1098   "Return a list of FILE's pages that contain text matching REGEXP.
1099 The value is an alist of the form (PAGE CONTEXTS) where PAGE is
1100 the pagenumber and CONTEXTS are all lines of text containing a match."
1101   (with-temp-buffer
1102     (insert-file-contents file)
1103     (let ((page 1)
1104           (lastpage 1)
1105           matches)
1106       (while (re-search-forward (concat "\\(?:\\([\f]\\)\\|\\("
1107                                         regexp "\\)\\)") nil t)
1108         (when (match-string 1) (setq page (1+ page)))
1109         (when (match-string 2)
1110           (if (/= page lastpage)
1111               (push (cons page
1112                           (list (buffer-substring
1113                                  (line-beginning-position)
1114                                  (line-end-position))))
1115                     matches)
1116             (setq matches (cons
1117                            (append
1118                             (or
1119                              ;; This page already is a match.
1120                              (car matches)
1121                              ;; This is the first match on page.
1122                              (list page))
1123                             (list (buffer-substring
1124                                    (line-beginning-position)
1125                                    (line-end-position))))
1126                            (cdr matches))))
1127           (setq lastpage page)))
1128       (nreverse matches))))
1129
1130 (defun doc-view-search-no-of-matches (list)
1131   "Extract the number of matches from the search result LIST."
1132   (let ((no 0))
1133     (dolist (p list)
1134       (setq no (+ no (1- (length p)))))
1135     no))
1136
1137 (defun doc-view-search-backward (new-query)
1138   "Call `doc-view-search' for backward search.
1139 If prefix NEW-QUERY is given, ask for a new regexp."
1140   (interactive "P")
1141   (doc-view-search new-query t))
1142
1143 (defun doc-view-search (new-query &optional backward)
1144   "Jump to the next match or initiate a new search if NEW-QUERY is given.
1145 If the current document hasn't been transformed to plain text
1146 till now do that first.
1147 If BACKWARD is non-nil, jump to the previous match."
1148   (interactive "P")
1149   (if (and (not new-query)
1150            doc-view-current-search-matches)
1151       (if backward
1152           (doc-view-search-previous-match 1)
1153         (doc-view-search-next-match 1))
1154     ;; New search, so forget the old results.
1155     (setq doc-view-current-search-matches nil)
1156     (let ((txt (expand-file-name "doc.txt"
1157                                  (doc-view-current-cache-dir))))
1158       (if (file-readable-p txt)
1159           (progn
1160             (setq doc-view-current-search-matches
1161                   (doc-view-search-internal
1162                    (read-from-minibuffer "Regexp: ")
1163                    txt))
1164             (message "DocView: search yielded %d matches."
1165                      (doc-view-search-no-of-matches
1166                       doc-view-current-search-matches)))
1167         ;; We must convert to TXT first!
1168         (if doc-view-current-converter-processes
1169             (message "DocView: please wait till conversion finished.")
1170           (doc-view-doc->txt txt (lambda () (doc-view-search nil))))))))
1171
1172 (defun doc-view-search-next-match (arg)
1173   "Go to the ARGth next matching page."
1174   (interactive "p")
1175   (let* ((next-pages (doc-view-remove-if
1176                       (lambda (i) (<= (car i) (doc-view-current-page)))
1177                       doc-view-current-search-matches))
1178          (page (car (nth (1- arg) next-pages))))
1179     (if page
1180         (doc-view-goto-page page)
1181       (when (and
1182              doc-view-current-search-matches
1183              (y-or-n-p "No more matches after current page.  Wrap to first match? "))
1184         (doc-view-goto-page (caar doc-view-current-search-matches))))))
1185
1186 (defun doc-view-search-previous-match (arg)
1187   "Go to the ARGth previous matching page."
1188   (interactive "p")
1189   (let* ((prev-pages (doc-view-remove-if
1190                       (lambda (i) (>= (car i) (doc-view-current-page)))
1191                       doc-view-current-search-matches))
1192          (page (car (nth (1- arg) (nreverse prev-pages)))))
1193     (if page
1194         (doc-view-goto-page page)
1195       (when (and
1196              doc-view-current-search-matches
1197              (y-or-n-p "No more matches before current page.  Wrap to last match? "))
1198         (doc-view-goto-page (caar (last doc-view-current-search-matches)))))))
1199
1200 ;;;; User interface commands and the mode
1201
1202 (put 'doc-view-mode 'mode-class 'special)
1203
1204 (defun doc-view-already-converted-p ()
1205   "Return non-nil if the current doc was already converted."
1206   (and (file-exists-p (doc-view-current-cache-dir))
1207        ;; Check that the resolution info is there, otherwise it means
1208        ;; the conversion is incomplete.
1209        (file-readable-p (expand-file-name "resolution.el"
1210                                           (doc-view-current-cache-dir)))
1211        (> (length (directory-files (doc-view-current-cache-dir)
1212                                    nil "\\.png\\'"))
1213           0)))
1214
1215 (defun doc-view-initiate-display ()
1216   ;; Switch to image display if possible
1217   (if (doc-view-mode-p doc-view-doc-type)
1218       (progn
1219         (doc-view-buffer-message)
1220         (setf (doc-view-current-page) (or (doc-view-current-page) 1))
1221         (if (doc-view-already-converted-p)
1222             (progn
1223               (message "DocView: using cached files!")
1224               ;; Load the saved resolution
1225               (let* ((res-file (expand-file-name "resolution.el"
1226                                                  (doc-view-current-cache-dir)))
1227                      (res
1228                       (with-temp-buffer
1229                         (when (file-readable-p res-file)
1230                           (insert-file-contents res-file)
1231                           (read (current-buffer))))))
1232                 (when (numberp res)
1233                   (set (make-local-variable 'doc-view-resolution) res)))
1234               (doc-view-display (current-buffer) 'force))
1235           (doc-view-convert-current-doc))
1236         (message
1237          "%s"
1238          (substitute-command-keys
1239           (concat "Type \\[doc-view-toggle-display] to toggle between "
1240                   "editing or viewing the document."))))
1241     (message
1242      "%s"
1243      (concat "No PNG support is available, or some conversion utility for "
1244              (file-name-extension doc-view-buffer-file-name)
1245              " files is missing."))
1246     (when (and (executable-find doc-view-pdftotext-program)
1247                (y-or-n-p
1248                 "Unable to render file.  View extracted text instead? "))
1249       (doc-view-open-text))
1250     (doc-view-toggle-display)))
1251
1252 (defvar bookmark-make-record-function)
1253
1254 (defun doc-view-clone-buffer-hook ()
1255   ;; FIXME: There are several potential problems linked with reconversion
1256   ;; and auto-revert when we have indirect buffers because they share their
1257   ;; /tmp cache directory.  This sharing is good (you'd rather not reconvert
1258   ;; for each clone), but that means that clones need to collaborate a bit.
1259   ;; I guess it mostly means: detect when a reconversion process is already
1260   ;; running, and run the sentinel in all clones.
1261   ;;
1262   ;; Maybe the clones should really have a separate /tmp directory
1263   ;; so they could have a different resolution and you could use clones
1264   ;; for zooming.
1265   (remove-overlays (point-min) (point-max) 'doc-view t)
1266   (if (consp image-mode-winprops-alist) (setq image-mode-winprops-alist nil)))
1267
1268 (defun doc-view-intersection (l1 l2)
1269   (let ((l ()))
1270     (dolist (x l1) (if (memq x l2) (push x l)))
1271     l))
1272
1273 (defun doc-view-set-doc-type ()
1274   "Figure out the current document type (`doc-view-doc-type')."
1275   (let ((name-types
1276          (when buffer-file-name
1277            (cdr (assoc (file-name-extension buffer-file-name)
1278                        '(
1279                          ;; DVI
1280                          ("dvi" dvi)
1281                          ;; PDF
1282                          ("pdf" pdf) ("epdf" pdf)
1283                          ;; PostScript
1284                          ("ps" ps) ("eps" ps)
1285                          ;; OpenDocument formats
1286                          ("odt" odf) ("ods" odf) ("odp" odf) ("odg" odf)
1287                          ("odc" odf) ("odi" odf) ("odm" odf) ("ott" odf)
1288                          ("ots" odf) ("otp" odf) ("otg" odf)
1289                          ;; Microsoft Office formats (also handled
1290                          ;; by the odf conversion chain)
1291                          ("doc" odf) ("docx" odf) ("xls" odf) ("xlsx" odf)
1292                          ("ppt" odf) ("pptx" odf))))))
1293         (content-types
1294          (save-excursion
1295            (goto-char (point-min))
1296            (cond
1297             ((looking-at "%!") '(ps))
1298             ((looking-at "%PDF") '(pdf))
1299             ((looking-at "\367\002") '(dvi))))))
1300     (set (make-local-variable 'doc-view-doc-type)
1301          (car (or (doc-view-intersection name-types content-types)
1302                   (when (and name-types content-types)
1303                     (error "Conflicting types: name says %s but content says %s"
1304                            name-types content-types))
1305                   name-types content-types
1306                   (error "Cannot determine the document type"))))))
1307
1308 ;;;###autoload
1309 (defun doc-view-mode ()
1310   "Major mode in DocView buffers.
1311
1312 DocView Mode is an Emacs document viewer.  It displays PDF, PS
1313 and DVI files (as PNG images) in Emacs buffers.
1314
1315 You can use \\<doc-view-mode-map>\\[doc-view-toggle-display] to
1316 toggle between displaying the document or editing it as text.
1317 \\{doc-view-mode-map}"
1318   (interactive)
1319
1320   (if (= (point-min) (point-max))
1321       ;; The doc is empty or doesn't exist at all, so fallback to
1322       ;; another mode.  We used to also check file-exists-p, but this
1323       ;; returns nil for tar members.
1324       (doc-view-fallback-mode)
1325
1326     (let* ((prev-major-mode (if (eq major-mode 'doc-view-mode)
1327                                 doc-view-previous-major-mode
1328                               (when (not (memq major-mode
1329                                                '(doc-view-mode fundamental-mode)))
1330                                 major-mode))))
1331       (kill-all-local-variables)
1332       (set (make-local-variable 'doc-view-previous-major-mode) prev-major-mode))
1333
1334     ;; Figure out the document type.
1335     (unless doc-view-doc-type
1336       (doc-view-set-doc-type))
1337
1338     (doc-view-make-safe-dir doc-view-cache-directory)
1339     ;; Handle compressed files, remote files, files inside archives
1340     (set (make-local-variable 'doc-view-buffer-file-name)
1341          (cond
1342           (jka-compr-really-do-compress
1343            ;; FIXME: there's a risk of name conflicts here.
1344            (expand-file-name
1345             (file-name-nondirectory
1346              (file-name-sans-extension buffer-file-name))
1347             doc-view-cache-directory))
1348           ;; Is the file readable by local processes?
1349           ;; We used to use `file-remote-p' but it's unclear what it's
1350           ;; supposed to return nil for things like local files accessed via
1351           ;; `su' or via file://...
1352           ((let ((file-name-handler-alist nil))
1353              (not (and buffer-file-name (file-readable-p buffer-file-name))))
1354            ;; FIXME: there's a risk of name conflicts here.
1355            (expand-file-name
1356             (if buffer-file-name
1357                 (file-name-nondirectory buffer-file-name)
1358               (buffer-name))
1359             doc-view-cache-directory))
1360           (t buffer-file-name)))
1361     (when (not (string= doc-view-buffer-file-name buffer-file-name))
1362       (write-region nil nil doc-view-buffer-file-name))
1363
1364     (add-hook 'change-major-mode-hook
1365               (lambda ()
1366                 (doc-view-kill-proc)
1367                 (remove-overlays (point-min) (point-max) 'doc-view t))
1368               nil t)
1369     (add-hook 'clone-indirect-buffer-hook 'doc-view-clone-buffer-hook nil t)
1370     (add-hook 'kill-buffer-hook 'doc-view-kill-proc nil t)
1371
1372     (remove-overlays (point-min) (point-max) 'doc-view t) ;Just in case.
1373     ;; Keep track of display info ([vh]scroll, page number, overlay,
1374     ;; ...)  for each window in which this document is shown.
1375     (add-hook 'image-mode-new-window-functions
1376               'doc-view-new-window-function nil t)
1377     (image-mode-setup-winprops)
1378
1379     (set (make-local-variable 'mode-line-position)
1380          '(" P" (:eval (number-to-string (doc-view-current-page)))
1381            "/" (:eval (number-to-string (doc-view-last-page-number)))))
1382     ;; Don't scroll unless the user specifically asked for it.
1383     (set (make-local-variable 'auto-hscroll-mode) nil)
1384     (set (make-local-variable 'mwheel-scroll-up-function)
1385          'doc-view-scroll-up-or-next-page)
1386     (set (make-local-variable 'mwheel-scroll-down-function)
1387          'doc-view-scroll-down-or-previous-page)
1388     (set (make-local-variable 'cursor-type) nil)
1389     (use-local-map doc-view-mode-map)
1390     (set (make-local-variable 'after-revert-hook) 'doc-view-reconvert-doc)
1391     (set (make-local-variable 'bookmark-make-record-function)
1392          'doc-view-bookmark-make-record)
1393     (setq mode-name "DocView"
1394           buffer-read-only t
1395           major-mode 'doc-view-mode)
1396     (doc-view-initiate-display)
1397     ;; Switch off view-mode explicitly, because doc-view-mode is the
1398     ;; canonical view mode for PDF/PS/DVI files.  This could be
1399     ;; switched on automatically depending on the value of
1400     ;; `view-read-only'.
1401     (set (make-local-variable 'view-read-only) nil)
1402     (run-mode-hooks 'doc-view-mode-hook)))
1403
1404 (defun doc-view-fallback-mode ()
1405   "Fallback to the previous or next best major mode."
1406   (if doc-view-previous-major-mode
1407       (funcall doc-view-previous-major-mode)
1408     (let ((auto-mode-alist (rassq-delete-all
1409                             'doc-view-mode-maybe
1410                             (rassq-delete-all 'doc-view-mode
1411                                               (copy-alist auto-mode-alist)))))
1412       (normal-mode))))
1413
1414 ;;;###autoload
1415 (defun doc-view-mode-maybe ()
1416   "Switch to `doc-view-mode' if possible.
1417 If the required external tools are not available, then fallback
1418 to the next best mode."
1419   (condition-case nil
1420       (doc-view-set-doc-type)
1421     (error (doc-view-fallback-mode)))
1422   (if (doc-view-mode-p doc-view-doc-type)
1423       (doc-view-mode)
1424     (doc-view-fallback-mode)))
1425
1426 ;;;###autoload
1427 (define-minor-mode doc-view-minor-mode
1428   "Toggle Doc view minor mode.
1429 With arg, turn Doc view minor mode on if arg is positive, off otherwise.
1430 See the command `doc-view-mode' for more information on this mode."
1431   nil " DocView" doc-view-minor-mode-map
1432   :group 'doc-view
1433   (when doc-view-minor-mode
1434     (add-hook 'change-major-mode-hook (lambda () (doc-view-minor-mode -1)) nil t)
1435     (message
1436      "%s"
1437      (substitute-command-keys
1438       "Type \\[doc-view-toggle-display] to toggle between editing or viewing the document."))))
1439
1440 (defun doc-view-clear-cache ()
1441   "Delete the whole cache (`doc-view-cache-directory')."
1442   (interactive)
1443   (dired-delete-file doc-view-cache-directory 'always))
1444
1445 (defun doc-view-dired-cache ()
1446   "Open `dired' in `doc-view-cache-directory'."
1447   (interactive)
1448   (dired doc-view-cache-directory))
1449
1450
1451 ;;;; Bookmark integration
1452
1453 (declare-function bookmark-make-record-default
1454                   "bookmark" (&optional no-file no-context posn))
1455 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
1456 (declare-function bookmark-default-handler "bookmark" (bmk))
1457
1458 (defun doc-view-bookmark-make-record ()
1459   (nconc (bookmark-make-record-default)
1460          `((page     . ,(doc-view-current-page))
1461            (handler  . doc-view-bookmark-jump))))
1462
1463
1464 ;;;###autoload
1465 (defun doc-view-bookmark-jump (bmk)
1466   ;; This implements the `handler' function interface for record type
1467   ;; returned by `doc-view-bookmark-make-record', which see.
1468   (prog1 (bookmark-default-handler bmk)
1469     (let ((page (bookmark-prop-get bmk 'page)))
1470       (when (not (eq major-mode 'doc-view-mode))
1471         (doc-view-toggle-display))
1472       (with-selected-window
1473           (or (get-buffer-window (current-buffer) 0)
1474               (selected-window))
1475         (doc-view-goto-page page)))))
1476
1477
1478 (provide 'doc-view)
1479
1480 ;; Local Variables:
1481 ;; mode: outline-minor
1482 ;; End:
1483
1484 ;; arch-tag: 5d6e5c5e-095f-489e-b4e4-1ca90a7d79be
1485 ;;; doc-view.el ends here