lisp/doc-view.el

   1 ;;; doc-view.el --- View PDF/PostScript/DVI files in Emacs -*- lexical-binding: t -*-
   2
   3
   4 ;; Copyright (C) 2007-2013 Free Software Foundation, Inc.
   5 ;;
   6 ;; Author: Tassilo Horn <tsdh@gnu.org>
   7 ;; Maintainer: Tassilo Horn <tsdh@gnu.org>
   8 ;; Keywords: files, pdf, ps, dvi
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Requirements:
  26
  27 ;; doc-view.el requires GNU Emacs 22.1 or newer.  You also need Ghostscript,
  28 ;; `dvipdf' (comes with Ghostscript) or `dvipdfm' (comes with teTeX or TeXLive)
  29 ;; and `pdftotext', which comes with xpdf (http://www.foolabs.com/xpdf/) or
  30 ;; poppler (http://poppler.freedesktop.org/).
  31
  32 ;;; Commentary:
  33
  34 ;; DocView is a document viewer for Emacs.  It converts PDF, PS and DVI files
  35 ;; to a set of PNG files, one PNG for each page, and displays the PNG images
  36 ;; inside an Emacs buffer.  This buffer uses `doc-view-mode' which provides
  37 ;; convenient key bindings for browsing the document.
  38 ;;
  39 ;; To use it simply open a document file with
  40 ;;
  41 ;;     C-x C-f ~/path/to/document RET
  42 ;;
  43 ;; and the document will be converted and displayed, if your emacs supports png
  44 ;; images.  With `C-c C-c' you can toggle between the rendered images
  45 ;; representation and the source text representation of the document.
  46 ;;
  47 ;; Since conversion may take some time all the PNG images are cached in a
  48 ;; subdirectory of `doc-view-cache-directory' and reused when you want to view
  49 ;; that file again.  To reconvert a document hit `g' (`doc-view-reconvert-doc')
  50 ;; when displaying the document.  To delete all cached files use
  51 ;; `doc-view-clear-cache'.  To open the cache with dired, so that you can tidy
  52 ;; it out use `doc-view-dired-cache'.
  53 ;;
  54 ;; When conversion in underway the first page will be displayed as soon as it
  55 ;; is available and the available pages are refreshed every
  56 ;; `doc-view-conversion-refresh-interval' seconds.  If that variable is nil the
  57 ;; pages won't be displayed before conversion of the document finished
  58 ;; completely.
  59 ;;
  60 ;; DocView lets you select a slice of the displayed pages.  This slice
  61 ;; will be remembered and applied to all pages of the current
  62 ;; document.  This enables you to cut away the margins of a document
  63 ;; to save some space.  To select a slice you can use
  64 ;; `doc-view-set-slice' (bound to `s s') which will query you for the
  65 ;; coordinates of the slice's top-left corner and its width and
  66 ;; height.  A much more convenient way to do the same is offered by
  67 ;; the command `doc-view-set-slice-using-mouse' (bound to `s m').
  68 ;; After invocation you only have to press mouse-1 at the top-left
  69 ;; corner and drag it to the bottom-right corner of the desired slice.
  70 ;; Even more accurate and convenient is to use
  71 ;; `doc-view-set-slice-from-bounding-box' (bound to `s b') which uses
  72 ;; the BoundingBox information of the current page to set an optimal
  73 ;; slice.  To reset the slice use `doc-view-reset-slice' (bound to `s
  74 ;; r').
  75 ;;
  76 ;; You can also search within the document.  The command `doc-view-search'
  77 ;; (bound to `C-s') queries for a search regexp and initializes a list of all
  78 ;; matching pages and messages how many match-pages were found.  After that you
  79 ;; can jump to the next page containing a match with an additional `C-s'.  With
  80 ;; `C-r' you can do the same, but backwards.  To search for a new regexp give a
  81 ;; prefix arg to one of the search functions, e.g. by typing `C-u C-s'.  The
  82 ;; searching works by using a plain text representation of the document.  If
  83 ;; that doesn't already exist the first invocation of `doc-view-search' (or
  84 ;; `doc-view-search-backward') starts the conversion.  When that finishes and
  85 ;; you're still viewing the document (i.e. you didn't switch to another buffer)
  86 ;; you're queried for the regexp then.
  87 ;;
  88 ;; Dired users can simply hit `v' on a document file.  If it's a PS, PDF or DVI
  89 ;; it will be opened using `doc-view-mode'.
  90 ;;
  91
  92 ;;; Configuration:
  93
  94 ;; If the images are too small or too big you should set the "-rXXX" option in
  95 ;; `doc-view-ghostscript-options' to another value.  (The bigger your screen,
  96 ;; the higher the value.)
  97 ;;
  98 ;; This and all other options can be set with the customization interface.
  99 ;; Simply do
 100 ;;
 101 ;;     M-x customize-group RET doc-view RET
 102 ;;
 103 ;; and modify them to your needs.
 104
 105 ;;; Todo:
 106
 107 ;; - add print command.
 108 ;; - share more code with image-mode.
 109 ;; - better menu.
 110 ;; - Bind slicing to a drag event.
 111 ;; - zoom the region around the cursor (like xdvi).
 112 ;; - get rid of the silly arrow in the fringe.
 113 ;; - improve anti-aliasing (pdf-utils gets it better).
 114
 115 ;;;; About isearch support
 116
 117 ;; I tried implementing isearch by setting
 118 ;; `isearch-search-fun-function' buffer-locally, but that didn't
 119 ;; work too good.  The function doing the real search was called
 120 ;; endlessly somehow.  But even if we'd get that working no real
 121 ;; isearch feeling comes up due to the missing match highlighting.
 122 ;; Currently I display all lines containing a match in a tooltip and
 123 ;; each C-s or C-r jumps directly to the next/previous page with a
 124 ;; match.  With isearch we could only display the current match.  So
 125 ;; we had to decide if another C-s jumps to the next page with a
 126 ;; match (thus only the first match in a page will be displayed in a
 127 ;; tooltip) or to the next match, which would do nothing visible
 128 ;; (except the tooltip) if the next match is on the same page.
 129
 130 ;; And it's much slower than the current search facility, because
 131 ;; isearch really searches for each step forward or backward whereas
 132 ;; the current approach searches once and then it knows to which
 133 ;; pages to jump.
 134
 135 ;; Anyway, if someone with better isearch knowledge wants to give it a try,
 136 ;; feel free to do it.  --Tassilo
 137
 138 ;;; Code:
 139
 140 (eval-when-compile (require 'cl-lib))
 141 (require 'dired)
 142 (require 'image-mode)
 143 (require 'jka-compr)
 144
 145 ;;;; Customization Options
 146
 147 (defgroup doc-view nil
 148   "In-buffer viewer for PDF, PostScript, DVI, and DJVU files."
 149   :link '(function-link doc-view)
 150   :version "22.2"
 151   :group 'applications
 152   :group 'data
 153   :group 'multimedia
 154   :prefix "doc-view-")
 155
 156 (defcustom doc-view-ghostscript-program "gs"
 157   "Program to convert PS and PDF files to PNG."
 158   :type 'file
 159   :group 'doc-view)
 160
 161 (defcustom doc-view-pdfdraw-program
 162   (cond
 163    ((executable-find "pdfdraw") "pdfdraw")
 164    (t "mudraw"))
 165   "Name of MuPDF's program to convert PDF files to PNG."
 166   :type 'file
 167   :version "24.4")
 168
 169 (defcustom doc-view-pdf->png-converter-function
 170   (if (executable-find doc-view-pdfdraw-program)
 171       #'doc-view-pdf->png-converter-mupdf
 172     #'doc-view-pdf->png-converter-ghostscript)
 173   "Function to call to convert a PDF file into a PNG file."
 174   :type '(radio
 175           (function-item doc-view-pdf->png-converter-ghostscript
 176                          :doc "Use ghostscript")
 177           (function-item doc-view-pdf->png-converter-mupdf
 178                          :doc "Use mupdf")
 179           function)
 180   :version "24.4")
 181
 182 (defcustom doc-view-ghostscript-options
 183   '("-dSAFER" ;; Avoid security problems when rendering files from untrusted
 184     ;; sources.
 185     "-dNOPAUSE" "-sDEVICE=png16m" "-dTextAlphaBits=4"
 186     "-dBATCH" "-dGraphicsAlphaBits=4" "-dQUIET")
 187   "A list of options to give to ghostscript."
 188   :type '(repeat string)
 189   :group 'doc-view)
 190
 191 (defcustom doc-view-resolution 100
 192   "Dots per inch resolution used to render the documents.
 193 Higher values result in larger images."
 194   :type 'number
 195   :group 'doc-view)
 196
 197 (defcustom doc-view-scale-internally t
 198   "Whether we should try to rescale images ourselves.
 199 If nil, the document is re-rendered every time the scaling factor is modified.
 200 This only has an effect if the image libraries linked with Emacs support
 201 scaling."
 202   :type 'boolean)
 203
 204 (defcustom doc-view-image-width 850
 205   "Default image width.
 206 Has only an effect if `doc-view-scale-internally' is non-nil and support for
 207 scaling is compiled into emacs."
 208   :version "24.1"
 209   :type 'number
 210   :group 'doc-view)
 211
 212 (defcustom doc-view-dvipdfm-program "dvipdfm"
 213   "Program to convert DVI files to PDF.
 214
 215 DVI file will be converted to PDF before the resulting PDF is
 216 converted to PNG.
 217
 218 If this and `doc-view-dvipdf-program' are set,
 219 `doc-view-dvipdf-program' will be preferred."
 220   :type 'file
 221   :group 'doc-view)
 222
 223 (defcustom doc-view-dvipdf-program "dvipdf"
 224   "Program to convert DVI files to PDF.
 225
 226 DVI file will be converted to PDF before the resulting PDF is
 227 converted to PNG.
 228
 229 If this and `doc-view-dvipdfm-program' are set,
 230 `doc-view-dvipdf-program' will be preferred."
 231   :type 'file
 232   :group 'doc-view)
 233
 234 (define-obsolete-variable-alias 'doc-view-unoconv-program
 235                                 'doc-view-odf->pdf-converter-program
 236                                 "24.4")
 237
 238 (defcustom doc-view-odf->pdf-converter-program
 239   (cond
 240    ((executable-find "soffice") "soffice")
 241    ((executable-find "unoconv") "unoconv")
 242    (t "soffice"))
 243   "Program to convert any file type readable by OpenOffice.org to PDF.
 244
 245 Needed for viewing OpenOffice.org (and MS Office) files."
 246   :version "24.4"
 247   :type 'file
 248   :group 'doc-view)
 249
 250 (defcustom doc-view-odf->pdf-converter-function
 251   (cond
 252    ((string-match "unoconv\\'" doc-view-odf->pdf-converter-program)
 253     #'doc-view-odf->pdf-converter-unoconv)
 254    ((string-match "soffice\\'" doc-view-odf->pdf-converter-program)
 255     #'doc-view-odf->pdf-converter-soffice))
 256   "Function to call to convert a ODF file into a PDF file."
 257   :type '(radio
 258           (function-item doc-view-odf->pdf-converter-unoconv
 259                          :doc "Use unoconv")
 260           (function-item doc-view-odf->pdf-converter-soffice
 261                          :doc "Use LibreOffice")
 262           function)
 263   :version "24.4")
 264
 265 (defcustom doc-view-ps2pdf-program "ps2pdf"
 266   "Program to convert PS files to PDF.
 267
 268 PS files will be converted to PDF before searching is possible."
 269   :type 'file
 270   :group 'doc-view)
 271
 272 (defcustom doc-view-pdftotext-program "pdftotext"
 273   "Program to convert PDF files to plain text.
 274
 275 Needed for searching."
 276   :type 'file
 277   :group 'doc-view)
 278
 279 (defcustom doc-view-cache-directory
 280   (expand-file-name (format "docview%d" (user-uid))
 281                     temporary-file-directory)
 282   "The base directory, where the PNG images will be saved."
 283   :type 'directory
 284   :group 'doc-view)
 285
 286 (defvar doc-view-conversion-buffer " *doc-view conversion output*"
 287   "The buffer where messages from the converter programs go to.")
 288
 289 (defcustom doc-view-conversion-refresh-interval 1
 290   "Interval in seconds between refreshes of the DocView buffer while converting.
 291 After such a refresh newly converted pages will be available for
 292 viewing.  If set to nil there won't be any refreshes and the
 293 pages won't be displayed before conversion of the whole document
 294 has finished."
 295   :type 'integer
 296   :group 'doc-view)
 297
 298 (defcustom doc-view-continuous nil
 299   "In Continuous mode reaching the page edge advances to next/previous page.
 300 When non-nil, scrolling a line upward at the bottom edge of the page
 301 moves to the next page, and scrolling a line downward at the top edge
 302 of the page moves to the previous page."
 303   :type 'boolean
 304   :group 'doc-view
 305   :version "23.2")
 306
 307 ;;;; Internal Variables
 308
 309 (defun doc-view-new-window-function (winprops)
 310   ;; (message "New window %s for buf %s" (car winprops) (current-buffer))
 311   (cl-assert (or (eq t (car winprops))
 312                  (eq (window-buffer (car winprops)) (current-buffer))))
 313   (let ((ol (image-mode-window-get 'overlay winprops)))
 314     (if ol
 315         (progn
 316           (setq ol (copy-overlay ol))
 317           ;; `ol' might actually be dead.
 318           (move-overlay ol (point-min) (point-max)))
 319       (setq ol (make-overlay (point-min) (point-max) nil t))
 320       (overlay-put ol 'doc-view t))
 321     (overlay-put ol 'window (car winprops))
 322     (unless (windowp (car winprops))
 323       ;; It's a pseudo entry.  Let's make sure it's not displayed (the
 324       ;; `window' property is only effective if its value is a window).
 325       (cl-assert (eq t (car winprops)))
 326       (delete-overlay ol))
 327     (image-mode-window-put 'overlay ol winprops)))
 328
 329 (defvar doc-view-current-files nil
 330   "Only used internally.")
 331 (make-variable-buffer-local 'doc-view-current-files)
 332
 333 (defvar doc-view-current-converter-processes nil
 334   "Only used internally.")
 335 (make-variable-buffer-local 'doc-view-current-converter-processes)
 336
 337 (defvar doc-view-current-timer nil
 338   "Only used internally.")
 339 (make-variable-buffer-local 'doc-view-current-timer)
 340
 341 (defvar doc-view-current-cache-dir nil
 342   "Only used internally.")
 343 (make-variable-buffer-local 'doc-view-current-cache-dir)
 344
 345 (defvar doc-view-current-search-matches nil
 346   "Only used internally.")
 347 (make-variable-buffer-local 'doc-view-current-search-matches)
 348
 349 (defvar doc-view-pending-cache-flush nil
 350   "Only used internally.")
 351
 352 (defvar doc-view-previous-major-mode nil
 353   "Only used internally.")
 354
 355 (defvar doc-view-buffer-file-name nil
 356   "Only used internally.
 357 The file name used for conversion.  Normally it's the same as
 358 `buffer-file-name', but for remote files, compressed files and
 359 files inside an archive it is a temporary copy of
 360 the (uncompressed, extracted) file residing in
 361 `doc-view-cache-directory'.")
 362
 363 (defvar doc-view-doc-type nil
 364   "The type of document in the current buffer.
 365 Can be `dvi', `pdf', or `ps'.")
 366
 367 (defvar doc-view-single-page-converter-function nil
 368   "Function to call to convert a single page of the document to a bitmap file.
 369 May operate on the source document or on some intermediate (typically PDF)
 370 conversion of it.")
 371
 372 (defvar-local doc-view--image-type nil
 373   "The type of image in the current buffer.
 374 Can be `png' or `tiff'.")
 375
 376 (defvar-local doc-view--image-file-pattern nil
 377   "The `format' pattern of image file names.
 378 Typically \"page-%s.png\".")
 379
 380 ;;;; DocView Keymaps
 381
 382 (defvar doc-view-mode-map
 383   (let ((map (make-sparse-keymap)))
 384     (set-keymap-parent map image-mode-map)
 385     ;; Navigation in the document
 386     (define-key map (kbd "n")         'doc-view-next-page)
 387     (define-key map (kbd "p")         'doc-view-previous-page)
 388     (define-key map (kbd "<next>")    'forward-page)
 389     (define-key map (kbd "<prior>")   'backward-page)
 390     (define-key map [remap forward-page]  'doc-view-next-page)
 391     (define-key map [remap backward-page] 'doc-view-previous-page)
 392     (define-key map (kbd "SPC")       'doc-view-scroll-up-or-next-page)
 393     (define-key map (kbd "DEL")       'doc-view-scroll-down-or-previous-page)
 394     (define-key map (kbd "C-n")       'doc-view-next-line-or-next-page)
 395     (define-key map (kbd "<down>")    'doc-view-next-line-or-next-page)
 396     (define-key map (kbd "C-p")       'doc-view-previous-line-or-previous-page)
 397     (define-key map (kbd "<up>")      'doc-view-previous-line-or-previous-page)
 398     (define-key map (kbd "M-<")       'doc-view-first-page)
 399     (define-key map (kbd "M->")       'doc-view-last-page)
 400     (define-key map [remap goto-line] 'doc-view-goto-page)
 401     (define-key map (kbd "RET")       'image-next-line)
 402     ;; Zoom in/out.
 403     (define-key map "+"               'doc-view-enlarge)
 404     (define-key map "-"               'doc-view-shrink)
 405     ;; Fit the image to the window
 406     (define-key map "W"               'doc-view-fit-width-to-window)
 407     (define-key map "H"               'doc-view-fit-height-to-window)
 408     (define-key map "P"               'doc-view-fit-page-to-window)
 409     ;; Killing the buffer (and the process)
 410     (define-key map (kbd "k")         'doc-view-kill-proc-and-buffer)
 411     (define-key map (kbd "K")         'doc-view-kill-proc)
 412     ;; Slicing the image
 413     (define-key map (kbd "s s")       'doc-view-set-slice)
 414     (define-key map (kbd "s m")       'doc-view-set-slice-using-mouse)
 415     (define-key map (kbd "s b")       'doc-view-set-slice-from-bounding-box)
 416     (define-key map (kbd "s r")       'doc-view-reset-slice)
 417     ;; Searching
 418     (define-key map (kbd "C-s")       'doc-view-search)
 419     (define-key map (kbd "<find>")    'doc-view-search)
 420     (define-key map (kbd "C-r")       'doc-view-search-backward)
 421     ;; Show the tooltip
 422     (define-key map (kbd "C-t")       'doc-view-show-tooltip)
 423     ;; Toggle between text and image display or editing
 424     (define-key map (kbd "C-c C-c")   'doc-view-toggle-display)
 425     ;; Open a new buffer with doc's text contents
 426     (define-key map (kbd "C-c C-t")   'doc-view-open-text)
 427     ;; Reconvert the current document.  Don't just use revert-buffer
 428     ;; because that resets the scale factor, the page number, ...
 429     (define-key map (kbd "g")         'doc-view-revert-buffer)
 430     (define-key map (kbd "r")         'doc-view-revert-buffer)
 431     map)
 432   "Keymap used by `doc-view-mode' when displaying a doc as a set of images.")
 433
 434 (defun doc-view-revert-buffer (&optional ignore-auto noconfirm)
 435   "Like `revert-buffer', but preserves the buffer's current modes."
 436   ;; FIXME: this should probably be moved to files.el and used for
 437   ;; most/all "g" bindings to revert-buffer.
 438   (interactive (list (not current-prefix-arg)))
 439   (revert-buffer ignore-auto noconfirm 'preserve-modes))
 440
 441
 442 (easy-menu-define doc-view-menu doc-view-mode-map
 443   "Menu for Doc View mode."
 444   '("DocView"
 445     ["Toggle display"           doc-view-toggle-display]
 446     ("Continuous"
 447      ["Off"                     (setq doc-view-continuous nil)
 448       :style radio :selected    (eq doc-view-continuous nil)]
 449      ["On"                      (setq doc-view-continuous t)
 450       :style radio :selected    (eq doc-view-continuous t)]
 451      "---"
 452      ["Save as Default"
 453       (customize-save-variable 'doc-view-continuous doc-view-continuous) t]
 454      )
 455     "---"
 456     ["Set Slice"                doc-view-set-slice-using-mouse]
 457     ["Set Slice (BoundingBox)"  doc-view-set-slice-from-bounding-box]
 458     ["Set Slice (manual)"       doc-view-set-slice]
 459     ["Reset Slice"              doc-view-reset-slice]
 460     "---"
 461     ["Search"                   doc-view-search]
 462     ["Search Backwards"         doc-view-search-backward]
 463     ))
 464
 465 (defvar doc-view-minor-mode-map
 466   (let ((map (make-sparse-keymap)))
 467     ;; Toggle between text and image display or editing
 468     (define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
 469     map)
 470   "Keymap used by `doc-minor-view-mode'.")
 471
 472 ;;;; Navigation Commands
 473
 474 (defmacro doc-view-current-page (&optional win)
 475   `(image-mode-window-get 'page ,win))
 476 (defmacro doc-view-current-info () `(image-mode-window-get 'info))
 477 (defmacro doc-view-current-overlay () `(image-mode-window-get 'overlay))
 478 (defmacro doc-view-current-image () `(image-mode-window-get 'image))
 479 (defmacro doc-view-current-slice () `(image-mode-window-get 'slice))
 480
 481 (defun doc-view-last-page-number ()
 482   (length doc-view-current-files))
 483
 484 (defun doc-view-goto-page (page)
 485   "View the page given by PAGE."
 486   (interactive "nPage: ")
 487   (let ((len (doc-view-last-page-number))
 488         (hscroll (window-hscroll)))
 489     (if (< page 1)
 490         (setq page 1)
 491       (when (and (> page len)
 492                  ;; As long as the converter is running, we don't know
 493                  ;; how many pages will be available.
 494                  (null doc-view-current-converter-processes))
 495         (setq page len)))
 496     (setf (doc-view-current-page) page
 497           (doc-view-current-info)
 498           (concat
 499            (propertize
 500             (format "Page %d of %d." page len) 'face 'bold)
 501            ;; Tell user if converting isn't finished yet
 502            (if doc-view-current-converter-processes
 503                " (still converting...)\n"
 504              "\n")
 505            ;; Display context infos if this page matches the last search
 506            (when (and doc-view-current-search-matches
 507                       (assq page doc-view-current-search-matches))
 508              (concat (propertize "Search matches:\n" 'face 'bold)
 509                      (let ((contexts ""))
 510                        (dolist (m (cdr (assq page
 511                                              doc-view-current-search-matches)))
 512                          (setq contexts (concat contexts "  - \"" m "\"\n")))
 513                        contexts)))))
 514     ;; Update the buffer
 515     ;; We used to find the file name from doc-view-current-files but
 516     ;; that's not right if the pages are not generated sequentially
 517     ;; or if the page isn't in doc-view-current-files yet.
 518     (let ((file (expand-file-name
 519                  (format doc-view--image-file-pattern page)
 520                  (doc-view-current-cache-dir))))
 521       (doc-view-insert-image file :pointer 'arrow)
 522       (set-window-hscroll (selected-window) hscroll)
 523       (when (and (not (file-exists-p file))
 524                  doc-view-current-converter-processes)
 525         ;; The PNG file hasn't been generated yet.
 526         (funcall doc-view-single-page-converter-function
 527                  doc-view-buffer-file-name file page
 528                  (let ((win (selected-window)))
 529                    (lambda ()
 530                      (and (eq (current-buffer) (window-buffer win))
 531                           ;; If we changed page in the mean
 532                           ;; time, don't mess things up.
 533                           (eq (doc-view-current-page win) page)
 534                           ;; Make sure we don't infloop.
 535                           (file-readable-p file)
 536                           (with-selected-window win
 537                             (doc-view-goto-page page))))))))
 538     (overlay-put (doc-view-current-overlay)
 539                  'help-echo (doc-view-current-info))))
 540
 541 (defun doc-view-next-page (&optional arg)
 542   "Browse ARG pages forward."
 543   (interactive "p")
 544   (doc-view-goto-page (+ (doc-view-current-page) (or arg 1))))
 545
 546 (defun doc-view-previous-page (&optional arg)
 547   "Browse ARG pages backward."
 548   (interactive "p")
 549   (doc-view-goto-page (- (doc-view-current-page) (or arg 1))))
 550
 551 (defun doc-view-first-page ()
 552   "View the first page."
 553   (interactive)
 554   (doc-view-goto-page 1))
 555
 556 (defun doc-view-last-page ()
 557   "View the last page."
 558   (interactive)
 559   (doc-view-goto-page (doc-view-last-page-number)))
 560
 561 (defun doc-view-scroll-up-or-next-page (&optional arg)
 562   "Scroll page up ARG lines if possible, else goto next page.
 563 When `doc-view-continuous' is non-nil, scrolling upward
 564 at the bottom edge of the page moves to the next page.
 565 Otherwise, goto next page only on typing SPC (ARG is nil)."
 566   (interactive "P")
 567   (if (or doc-view-continuous (null arg))
 568       (let ((hscroll (window-hscroll))
 569             (cur-page (doc-view-current-page)))
 570         (when (= (window-vscroll) (image-scroll-up arg))
 571           (doc-view-next-page)
 572           (when (/= cur-page (doc-view-current-page))
 573             (image-bob)
 574             (image-bol 1))
 575           (set-window-hscroll (selected-window) hscroll)))
 576     (image-scroll-up arg)))
 577
 578 (defun doc-view-scroll-down-or-previous-page (&optional arg)
 579   "Scroll page down ARG lines if possible, else goto previous page.
 580 When `doc-view-continuous' is non-nil, scrolling downward
 581 at the top edge of the page moves to the previous page.
 582 Otherwise, goto previous page only on typing DEL (ARG is nil)."
 583   (interactive "P")
 584   (if (or doc-view-continuous (null arg))
 585       (let ((hscroll (window-hscroll))
 586             (cur-page (doc-view-current-page)))
 587         (when (= (window-vscroll) (image-scroll-down arg))
 588           (doc-view-previous-page)
 589           (when (/= cur-page (doc-view-current-page))
 590             (image-eob)
 591             (image-bol 1))
 592           (set-window-hscroll (selected-window) hscroll)))
 593     (image-scroll-down arg)))
 594
 595 (defun doc-view-next-line-or-next-page (&optional arg)
 596   "Scroll upward by ARG lines if possible, else goto next page.
 597 When `doc-view-continuous' is non-nil, scrolling a line upward
 598 at the bottom edge of the page moves to the next page."
 599   (interactive "p")
 600   (if doc-view-continuous
 601       (let ((hscroll (window-hscroll))
 602             (cur-page (doc-view-current-page)))
 603         (when (= (window-vscroll) (image-next-line arg))
 604           (doc-view-next-page)
 605           (when (/= cur-page (doc-view-current-page))
 606             (image-bob)
 607             (image-bol 1))
 608           (set-window-hscroll (selected-window) hscroll)))
 609     (image-next-line 1)))
 610
 611 (defun doc-view-previous-line-or-previous-page (&optional arg)
 612   "Scroll downward by ARG lines if possible, else goto previous page.
 613 When `doc-view-continuous' is non-nil, scrolling a line downward
 614 at the top edge of the page moves to the previous page."
 615   (interactive "p")
 616   (if doc-view-continuous
 617       (let ((hscroll (window-hscroll))
 618             (cur-page (doc-view-current-page)))
 619         (when (= (window-vscroll) (image-previous-line arg))
 620           (doc-view-previous-page)
 621           (when (/= cur-page (doc-view-current-page))
 622             (image-eob)
 623             (image-bol 1))
 624           (set-window-hscroll (selected-window) hscroll)))
 625     (image-previous-line arg)))
 626
 627 ;;;; Utility Functions
 628
 629 (defun doc-view-kill-proc ()
 630   "Kill the current converter process(es)."
 631   (interactive)
 632   (while (consp doc-view-current-converter-processes)
 633     (ignore-errors ;; Some entries might not be processes, and maybe
 634                    ;; some are dead already?
 635       (kill-process (pop doc-view-current-converter-processes))))
 636   (when doc-view-current-timer
 637     (cancel-timer doc-view-current-timer)
 638     (setq doc-view-current-timer nil))
 639   (setq mode-line-process nil))
 640
 641 (defun doc-view-kill-proc-and-buffer ()
 642   "Kill the current converter process and buffer."
 643   (interactive)
 644   (doc-view-kill-proc)
 645   (when (eq major-mode 'doc-view-mode)
 646     (kill-buffer (current-buffer))))
 647
 648 (defun doc-view-make-safe-dir (dir)
 649   (condition-case nil
 650       (let ((umask (default-file-modes)))
 651         (unwind-protect
 652             (progn
 653               ;; Create temp files with strict access rights.  It's easy to
 654               ;; loosen them later, whereas it's impossible to close the
 655               ;; time-window of loose permissions otherwise.
 656               (set-default-file-modes #o0700)
 657               (make-directory dir))
 658           ;; Reset the umask.
 659           (set-default-file-modes umask)))
 660     (file-already-exists
 661      (when (file-symlink-p dir)
 662        (error "Danger: %s points to a symbolic link" dir))
 663      ;; In case it was created earlier with looser rights.
 664      ;; We could check the mode info returned by file-attributes, but it's
 665      ;; a pain to parse and it may not tell you what we want under
 666      ;; non-standard file-systems.  So let's just say what we want and let
 667      ;; the underlying C code and file-system figure it out.
 668      ;; This also ends up checking a bunch of useful conditions: it makes
 669      ;; sure we have write-access to the directory and that we own it, thus
 670      ;; closing a bunch of security holes.
 671      (condition-case error
 672          (set-file-modes dir #o0700)
 673        (file-error
 674         (error
 675          (format "Unable to use temporary directory %s: %s"
 676                  dir (mapconcat 'identity (cdr error) " "))))))))
 677
 678 (defun doc-view-current-cache-dir ()
 679   "Return the directory where the png files of the current doc should be saved.
 680 It's a subdirectory of `doc-view-cache-directory'."
 681   (if doc-view-current-cache-dir
 682       doc-view-current-cache-dir
 683     ;; Try and make sure doc-view-cache-directory exists and is safe.
 684     (doc-view-make-safe-dir doc-view-cache-directory)
 685     ;; Now compute the subdirectory to use.
 686     (setq doc-view-current-cache-dir
 687           (file-name-as-directory
 688            (expand-file-name
 689             (concat (file-name-nondirectory doc-view-buffer-file-name)
 690                     "-"
 691                     (let ((file doc-view-buffer-file-name))
 692                       (with-temp-buffer
 693                         (set-buffer-multibyte nil)
 694                         (insert-file-contents-literally file)
 695                         (md5 (current-buffer)))))
 696             doc-view-cache-directory)))))
 697
 698 (defun doc-view-remove-if (predicate list)
 699   "Return LIST with all items removed that satisfy PREDICATE."
 700   (let (new-list)
 701     (dolist (item list)
 702       (when (not (funcall predicate item))
 703         (setq new-list (cons item new-list))))
 704      (nreverse new-list)))
 705
 706 ;;;###autoload
 707 (defun doc-view-mode-p (type)
 708   "Return non-nil if document type TYPE is available for `doc-view'.
 709 Document types are symbols like `dvi', `ps', `pdf', or `odf' (any
 710 OpenDocument format)."
 711   (and (display-graphic-p)
 712        (or (image-type-available-p 'imagemagick)
 713            (image-type-available-p 'png))
 714        (cond
 715         ((eq type 'dvi)
 716          (and (doc-view-mode-p 'pdf)
 717               (or (and doc-view-dvipdf-program
 718                        (executable-find doc-view-dvipdf-program))
 719                   (and doc-view-dvipdfm-program
 720                        (executable-find doc-view-dvipdfm-program)))))
 721         ((memq type '(postscript ps eps pdf))
 722          ;; FIXME: allow mupdf here
 723          (and doc-view-ghostscript-program
 724               (executable-find doc-view-ghostscript-program)))
 725         ((eq type 'odf)
 726          (and doc-view-odf->pdf-converter-program
 727               (executable-find doc-view-odf->pdf-converter-program)
 728               (doc-view-mode-p 'pdf)))
 729         ((eq type 'djvu)
 730          (executable-find "ddjvu"))
 731         (t ;; unknown image type
 732          nil))))
 733
 734 ;;;; Conversion Functions
 735
 736 (defvar doc-view-shrink-factor 1.125)
 737
 738 (defun doc-view-enlarge (factor)
 739   "Enlarge the document by FACTOR."
 740   (interactive (list doc-view-shrink-factor))
 741   (if (and doc-view-scale-internally
 742            (eq (plist-get (cdr (doc-view-current-image)) :type)
 743                'imagemagick))
 744       ;; ImageMagick supports on-the-fly-rescaling.
 745       (let ((new (ceiling (* factor doc-view-image-width))))
 746         (unless (equal new doc-view-image-width)
 747           (setq-local doc-view-image-width new)
 748           (doc-view-insert-image
 749            (plist-get (cdr (doc-view-current-image)) :file)
 750            :width doc-view-image-width)))
 751     (let ((new (ceiling (* factor doc-view-resolution))))
 752       (unless (equal new doc-view-resolution)
 753         (setq-local doc-view-resolution new)
 754         (doc-view-reconvert-doc)))))
 755
 756 (defun doc-view-shrink (factor)
 757   "Shrink the document."
 758   (interactive (list doc-view-shrink-factor))
 759   (doc-view-enlarge (/ 1.0 factor)))
 760
 761 (defun doc-view-fit-width-to-window ()
 762   "Fit the image width to the window width."
 763   (interactive)
 764   (let ((win-width (- (nth 2 (window-inside-pixel-edges))
 765                       (nth 0 (window-inside-pixel-edges))))
 766         (slice (doc-view-current-slice)))
 767     (if (not slice)
 768         (let ((img-width (car (image-display-size
 769                                (image-get-display-property) t))))
 770           (doc-view-enlarge (/ (float win-width) (float img-width))))
 771
 772       ;; If slice is set
 773       (let* ((slice-width (nth 2 slice))
 774              (scale-factor (/ (float win-width) (float slice-width)))
 775              (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
 776
 777         (doc-view-enlarge scale-factor)
 778         (setf (doc-view-current-slice) new-slice)
 779         (doc-view-goto-page (doc-view-current-page))))))
 780
 781 (defun doc-view-fit-height-to-window ()
 782   "Fit the image height to the window height."
 783   (interactive)
 784   (let ((win-height (- (nth 3 (window-inside-pixel-edges))
 785                        (nth 1 (window-inside-pixel-edges))))
 786         (slice (doc-view-current-slice)))
 787     (if (not slice)
 788         (let ((img-height (cdr (image-display-size
 789                                 (image-get-display-property) t))))
 790           ;; When users call 'doc-view-fit-height-to-window',
 791           ;; they might want to go to next page by typing SPC
 792           ;; ONLY once. So I used '(- win-height 1)' instead of
 793           ;; 'win-height'
 794           (doc-view-enlarge (/ (float (- win-height 1)) (float img-height))))
 795
 796       ;; If slice is set
 797       (let* ((slice-height (nth 3 slice))
 798              (scale-factor (/ (float (- win-height 1)) (float slice-height)))
 799              (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
 800
 801         (doc-view-enlarge scale-factor)
 802         (setf (doc-view-current-slice) new-slice)
 803         (doc-view-goto-page (doc-view-current-page))))))
 804
 805 (defun doc-view-fit-page-to-window ()
 806   "Fit the image to the window.
 807 More specifically, this function enlarges image by:
 808
 809 min {(window-width / image-width), (window-height / image-height)} times."
 810   (interactive)
 811   (let ((win-width (- (nth 2 (window-inside-pixel-edges))
 812                       (nth 0 (window-inside-pixel-edges))))
 813         (win-height (- (nth 3 (window-inside-pixel-edges))
 814                        (nth 1 (window-inside-pixel-edges))))
 815         (slice (doc-view-current-slice)))
 816     (if (not slice)
 817         (let ((img-width (car (image-display-size
 818                                (image-get-display-property) t)))
 819               (img-height (cdr (image-display-size
 820                                 (image-get-display-property) t))))
 821           (doc-view-enlarge (min (/ (float win-width) (float img-width))
 822                                  (/ (float (- win-height 1))
 823                                     (float img-height)))))
 824       ;; If slice is set
 825       (let* ((slice-width (nth 2 slice))
 826              (slice-height (nth 3 slice))
 827              (scale-factor (min (/ (float win-width) (float slice-width))
 828                                 (/ (float (- win-height 1))
 829                                    (float slice-height))))
 830              (new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
 831         (doc-view-enlarge scale-factor)
 832         (setf (doc-view-current-slice) new-slice)
 833         (doc-view-goto-page (doc-view-current-page))))))
 834
 835 (defun doc-view-reconvert-doc ()
 836   "Reconvert the current document.
 837 Should be invoked when the cached images aren't up-to-date."
 838   (interactive)
 839   (doc-view-kill-proc)
 840   ;; Clear the old cached files
 841   (when (file-exists-p (doc-view-current-cache-dir))
 842     (delete-directory (doc-view-current-cache-dir) 'recursive))
 843   (kill-local-variable 'doc-view-last-page-number)
 844   (doc-view-initiate-display))
 845
 846 (defun doc-view-sentinel (proc event)
 847   "Generic sentinel for doc-view conversion processes."
 848   (if (not (string-match "finished" event))
 849       (message "DocView: process %s changed status to %s."
 850                (process-name proc)
 851                (if (string-match "\\(.+\\)\n?\\'" event)
 852                    (match-string 1 event)
 853                  event))
 854     (when (buffer-live-p (process-get proc 'buffer))
 855       (with-current-buffer (process-get proc 'buffer)
 856         (setq doc-view-current-converter-processes
 857               (delq proc doc-view-current-converter-processes))
 858         (setq mode-line-process
 859               (if doc-view-current-converter-processes
 860                   (format ":%s" (car doc-view-current-converter-processes))))
 861         (funcall (process-get proc 'callback))))))
 862
 863 (defun doc-view-start-process (name program args callback)
 864   ;; Make sure the process is started in an existing directory, (rather than
 865   ;; some file-name-handler-managed dir, for example).
 866   (let* ((default-directory (if (file-readable-p default-directory)
 867                                 default-directory
 868                               (expand-file-name "~/")))
 869          (proc (apply 'start-process name doc-view-conversion-buffer
 870                       program args)))
 871     (push proc doc-view-current-converter-processes)
 872     (setq mode-line-process (list (format ":%s" proc)))
 873     (set-process-sentinel proc 'doc-view-sentinel)
 874     (process-put proc 'buffer   (current-buffer))
 875     (process-put proc 'callback callback)))
 876
 877 (defun doc-view-dvi->pdf (dvi pdf callback)
 878   "Convert DVI to PDF asynchronously and call CALLBACK when finished."
 879   ;; Prefer dvipdf over dvipdfm, because the latter has problems if the DVI
 880   ;; references and includes other PS files.
 881   (if (and doc-view-dvipdf-program
 882            (executable-find doc-view-dvipdf-program))
 883       (doc-view-start-process "dvi->pdf" doc-view-dvipdf-program
 884                               (list dvi pdf)
 885                               callback)
 886     (doc-view-start-process "dvi->pdf" doc-view-dvipdfm-program
 887                             (list "-o" pdf dvi)
 888                             callback)))
 889
 890 (defun doc-view-pdf->png-converter-ghostscript (pdf png page callback)
 891   (doc-view-start-process
 892    "pdf/ps->png" doc-view-ghostscript-program
 893    `(,@doc-view-ghostscript-options
 894      ,(format "-r%d" (round doc-view-resolution))
 895      ,@(if page `(,(format "-dFirstPage=%d" page)))
 896      ,@(if page `(,(format "-dLastPage=%d" page)))
 897      ,(concat "-sOutputFile=" png)
 898      ,pdf)
 899    callback))
 900
 901 (defalias 'doc-view-ps->png-converter-ghostscript
 902   'doc-view-pdf->png-converter-ghostscript)
 903
 904 (defun doc-view-djvu->tiff-converter-ddjvu (djvu tiff page callback)
 905   "Convert PAGE of a DJVU file to bitmap(s) asynchronously.
 906 Call CALLBACK with no arguments when done.
 907 If PAGE is nil, convert the whole document."
 908   (doc-view-start-process
 909    "djvu->tiff" "ddjvu"
 910    `("-format=tiff"
 911      ;; ddjvu only accepts the range 1-999.
 912      ,(format "-scale=%d" (round doc-view-resolution))
 913      ;; -eachpage was only added after djvulibre-3.5.25.3!
 914      ,@(unless page '("-eachpage"))
 915      ,@(if page `(,(format "-page=%d" page)))
 916      ,djvu
 917      ,tiff)
 918    callback))
 919
 920 (defun doc-view-pdf->png-converter-mupdf (pdf png page callback)
 921   (doc-view-start-process
 922    "pdf->png" doc-view-pdfdraw-program
 923    `(,(concat "-o" png)
 924      ,(format "-r%d" (round doc-view-resolution))
 925      ,pdf
 926      ,@(if page `(,(format "%d" page))))
 927    callback))
 928
 929 (defun doc-view-odf->pdf-converter-unoconv (odf callback)
 930   "Convert ODF to PDF asynchronously and call CALLBACK when finished.
 931 The converted PDF is put into the current cache directory, and it
 932 is named like ODF with the extension turned to pdf."
 933   (doc-view-start-process "odf->pdf" doc-view-odf->pdf-converter-program
 934                           (list "-f" "pdf" "-o" (doc-view-current-cache-dir) odf)
 935                           callback))
 936
 937 (defun doc-view-odf->pdf-converter-soffice (odf callback)
 938   "Convert ODF to PDF asynchronously and call CALLBACK when finished.
 939 The converted PDF is put into the current cache directory, and it
 940 is named like ODF with the extension turned to pdf."
 941   (doc-view-start-process "odf->pdf" doc-view-odf->pdf-converter-program
 942                           (list "--headless" "--convert-to" "pdf"
 943                                 "--outdir" (doc-view-current-cache-dir) odf)
 944                           callback))
 945
 946 (defun doc-view-pdf/ps->png (pdf-ps png)
 947   ;; FIXME: Fix name and docstring to account for djvu&tiff.
 948   "Convert PDF-PS to PNG asynchronously."
 949   (funcall
 950    (pcase doc-view-doc-type
 951      (`pdf doc-view-pdf->png-converter-function)
 952      (`djvu #'doc-view-djvu->tiff-converter-ddjvu)
 953      (_ #'doc-view-ps->png-converter-ghostscript))
 954    pdf-ps png nil
 955    (let ((resolution doc-view-resolution))
 956      (lambda ()
 957        ;; Only create the resolution file when it's all done, so it also
 958        ;; serves as a witness that the conversion is complete.
 959        (write-region (prin1-to-string resolution) nil
 960                      (expand-file-name "resolution.el"
 961                                        (doc-view-current-cache-dir))
 962                      nil 'silently)
 963        (when doc-view-current-timer
 964          (cancel-timer doc-view-current-timer)
 965          (setq doc-view-current-timer nil))
 966        (doc-view-display (current-buffer) 'force))))
 967
 968   ;; Update the displayed pages as soon as they're done generating.
 969   (when doc-view-conversion-refresh-interval
 970     (setq doc-view-current-timer
 971           (run-at-time "1 secs" doc-view-conversion-refresh-interval
 972                        'doc-view-display
 973                        (current-buffer)))))
 974
 975 (declare-function clear-image-cache "image.c" (&optional filter))
 976
 977 (defun doc-view-document->bitmap (pdf png pages)
 978   "Convert a document file to bitmap images asynchronously.
 979 Start by converting PAGES, and then the rest."
 980   (if (null pages)
 981       (doc-view-pdf/ps->png pdf png)
 982     ;; We could render several `pages' with a single process if they're
 983     ;; (almost) consecutive, but since in 99% of the cases, there'll be only
 984     ;; a single page anyway, and of the remaining 1%, few cases will have
 985     ;; consecutive pages, it's not worth the trouble.
 986     (let ((rest (cdr pages)))
 987       (funcall doc-view-single-page-converter-function
 988                pdf (format png (car pages)) (car pages)
 989        (lambda ()
 990          (if rest
 991              (doc-view-document->bitmap pdf png rest)
 992            ;; Yippie, the important pages are done, update the display.
 993            (clear-image-cache)
 994            ;; For the windows that have a message (like "Welcome to
 995            ;; DocView") display property, clearing the image cache is
 996            ;; not sufficient.
 997            (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
 998              (with-selected-window win
 999                (when (stringp (get-char-property (point-min) 'display))
1000                  (doc-view-goto-page (doc-view-current-page)))))
1001            ;; Convert the rest of the pages.
1002            (doc-view-pdf/ps->png pdf png)))))))
1003
1004 (defun doc-view-pdf->txt (pdf txt callback)
1005   "Convert PDF to TXT asynchronously and call CALLBACK when finished."
1006   (or (executable-find doc-view-pdftotext-program)
1007       (error "You need the `pdftotext' program to convert a PDF to text"))
1008   (doc-view-start-process "pdf->txt" doc-view-pdftotext-program
1009                           (list "-raw" pdf txt)
1010                           callback))
1011
1012 (defun doc-view-current-cache-doc-pdf ()
1013   "Return the name of the doc.pdf in the current cache dir.
1014   This file exists only if the current document isn't a PDF or PS file already."
1015   (expand-file-name "doc.pdf" (doc-view-current-cache-dir)))
1016
1017 (defun doc-view-doc->txt (txt callback)
1018   "Convert the current document to text and call CALLBACK when done."
1019   (make-directory (doc-view-current-cache-dir) t)
1020   (pcase doc-view-doc-type
1021     (`pdf
1022      ;; Doc is a PDF, so convert it to TXT
1023      (doc-view-pdf->txt doc-view-buffer-file-name txt callback))
1024     (`ps
1025      ;; Doc is a PS, so convert it to PDF (which will be converted to
1026      ;; TXT thereafter).
1027      (let ((pdf (doc-view-current-cache-doc-pdf)))
1028        (doc-view-ps->pdf doc-view-buffer-file-name pdf
1029                          (lambda () (doc-view-pdf->txt pdf txt callback)))))
1030     (`dvi
1031      ;; Doc is a DVI.  This means that a doc.pdf already exists in its
1032      ;; cache subdirectory.
1033      (doc-view-pdf->txt (doc-view-current-cache-doc-pdf) txt callback))
1034     (`odf
1035      ;; Doc is some ODF (or MS Office) doc.  This means that a doc.pdf
1036      ;; already exists in its cache subdirectory.
1037      (doc-view-pdf->txt (doc-view-current-cache-doc-pdf) txt callback))
1038     (_ (error "DocView doesn't know what to do"))))
1039
1040 (defun doc-view-ps->pdf (ps pdf callback)
1041   "Convert PS to PDF asynchronously and call CALLBACK when finished."
1042   (or (executable-find doc-view-ps2pdf-program)
1043       (error "You need the `ps2pdf' program to convert PS to PDF"))
1044   (doc-view-start-process "ps->pdf" doc-view-ps2pdf-program
1045                           (list
1046                            ;; Avoid security problems when rendering files from
1047                            ;; untrusted sources.
1048                            "-dSAFER"
1049                            ;; in-file and out-file
1050                            ps pdf)
1051                           callback))
1052
1053 (defun doc-view-active-pages ()
1054   (let ((pages ()))
1055     (dolist (win (get-buffer-window-list (current-buffer) nil 'visible))
1056       (let ((page (image-mode-window-get 'page win)))
1057         (unless (memq page pages) (push page pages))))
1058     pages))
1059
1060 (defun doc-view-convert-current-doc ()
1061   "Convert `doc-view-buffer-file-name' to a set of png files, one file per page.
1062 Those files are saved in the directory given by the function
1063 `doc-view-current-cache-dir'."
1064   ;; Let stale files still display while we recompute the new ones, so only
1065   ;; flush the cache when the conversion is over.  One of the reasons why it
1066   ;; is important to keep displaying the stale page is so that revert-buffer
1067   ;; preserves the horizontal/vertical scroll settings (which are otherwise
1068   ;; resets during the redisplay).
1069   (setq doc-view-pending-cache-flush t)
1070   (let ((png-file (expand-file-name
1071                    (format doc-view--image-file-pattern "%d")
1072                    (doc-view-current-cache-dir))))
1073     (make-directory (doc-view-current-cache-dir) t)
1074     (pcase doc-view-doc-type
1075       (`dvi
1076        ;; DVI files have to be converted to PDF before Ghostscript can process
1077        ;; it.
1078        (let ((pdf (doc-view-current-cache-doc-pdf)))
1079          (doc-view-dvi->pdf doc-view-buffer-file-name pdf
1080                             (lambda () (doc-view-pdf/ps->png pdf png-file)))))
1081       (`odf
1082        ;; ODF files have to be converted to PDF before Ghostscript can
1083        ;; process it.
1084        (let ((pdf (doc-view-current-cache-doc-pdf))
1085              (opdf (expand-file-name
1086                     (concat (file-name-base doc-view-buffer-file-name)
1087                             ".pdf")
1088                     doc-view-current-cache-dir))
1089              (png-file png-file))
1090          ;; The unoconv tool only supports an output directory, but no
1091          ;; file name.  It's named like the input file with the
1092          ;; extension replaced by pdf.
1093          (funcall doc-view-odf->pdf-converter-function doc-view-buffer-file-name
1094                             (lambda ()
1095                               ;; Rename to doc.pdf
1096                               (rename-file opdf pdf)
1097                               (doc-view-pdf/ps->png pdf png-file)))))
1098       ((or `pdf `djvu)
1099        (let ((pages (doc-view-active-pages)))
1100          ;; Convert doc to bitmap images starting with the active pages.
1101          (doc-view-document->bitmap doc-view-buffer-file-name png-file pages)))
1102       (_
1103        ;; Convert to PNG images.
1104        (doc-view-pdf/ps->png doc-view-buffer-file-name png-file)))))
1105
1106 ;;;; Slicing
1107
1108 (declare-function image-size "image.c" (spec &optional pixels frame))
1109
1110 (defun doc-view-set-slice (x y width height)
1111   "Set the slice of the images that should be displayed.
1112 You can use this function to tell doc-view not to display the
1113 margins of the document.  It prompts for the top-left corner (X
1114 and Y) of the slice to display and its WIDTH and HEIGHT.
1115
1116 See `doc-view-set-slice-using-mouse' and
1117 `doc-view-set-slice-from-bounding-box' for more convenient ways
1118 to do that.  To reset the slice use `doc-view-reset-slice'."
1119   (interactive
1120    (let* ((size (image-size (doc-view-current-image) t))
1121           (a (read-number (format "Top-left X (0..%d): " (car size))))
1122           (b (read-number (format "Top-left Y (0..%d): " (cdr size))))
1123           (c (read-number (format "Width (0..%d): " (- (car size) a))))
1124           (d (read-number (format "Height (0..%d): " (- (cdr size) b)))))
1125      (list a b c d)))
1126   (setf (doc-view-current-slice) (list x y width height))
1127   ;; Redisplay
1128   (doc-view-goto-page (doc-view-current-page)))
1129
1130 (defun doc-view-set-slice-using-mouse ()
1131   "Set the slice of the images that should be displayed.
1132 You set the slice by pressing mouse-1 at its top-left corner and
1133 dragging it to its bottom-right corner.  See also
1134 `doc-view-set-slice' and `doc-view-reset-slice'."
1135   (interactive)
1136   (let (x y w h done)
1137     (while (not done)
1138       (let ((e (read-event
1139                 (concat "Press mouse-1 at the top-left corner and "
1140                         "drag it to the bottom-right corner!"))))
1141         (when (eq (car e) 'drag-mouse-1)
1142           (setq x (car (posn-object-x-y (event-start e))))
1143           (setq y (cdr (posn-object-x-y (event-start e))))
1144           (setq w (- (car (posn-object-x-y (event-end e))) x))
1145           (setq h (- (cdr (posn-object-x-y (event-end e))) y))
1146           (setq done t))))
1147     (doc-view-set-slice x y w h)))
1148
1149 (defun doc-view-get-bounding-box ()
1150   "Get the BoundingBox information of the current page."
1151   (let* ((page (doc-view-current-page))
1152          (doc (let ((cache-doc (doc-view-current-cache-doc-pdf)))
1153                 (if (file-exists-p cache-doc)
1154                     cache-doc
1155                   doc-view-buffer-file-name)))
1156          (o (shell-command-to-string
1157              (concat doc-view-ghostscript-program
1158                      " -dSAFER -dBATCH -dNOPAUSE -q -sDEVICE=bbox "
1159                      (format "-dFirstPage=%s -dLastPage=%s %s"
1160                              page page doc)))))
1161     (save-match-data
1162       (when (string-match (concat "%%BoundingBox: "
1163                                   "\\([[:digit:]]+\\) \\([[:digit:]]+\\) "
1164                                   "\\([[:digit:]]+\\) \\([[:digit:]]+\\)") o)
1165         (mapcar #'string-to-number
1166                 (list (match-string 1 o)
1167                       (match-string 2 o)
1168                       (match-string 3 o)
1169                       (match-string 4 o)))))))
1170
1171 (defvar doc-view-paper-sizes
1172   '((a4 595 842)
1173     (a4-landscape 842 595)
1174     (letter 612 792)
1175     (letter-landscape 792 612)
1176     (legal 612 1008)
1177     (legal-landscape 1008 612)
1178     (a3 842 1191)
1179     (a3-landscape 1191 842)
1180     (tabloid 792 1224)
1181     (ledger 1224 792))
1182   "An alist from paper size names to dimensions.")
1183
1184 (defun doc-view-guess-paper-size (iw ih)
1185   "Guess the paper size according to the aspect ratio."
1186   (cl-labels ((div (x y)
1187                    (round (/ (* 100.0 x) y))))
1188     (let ((ar (div iw ih))
1189           (al (mapcar (lambda (l)
1190                         (list (div (nth 1 l) (nth 2 l)) (car l)))
1191                       doc-view-paper-sizes)))
1192       (cadr (assoc ar al)))))
1193
1194 (defun doc-view-scale-bounding-box (ps iw ih bb)
1195   (list (/ (* (nth 0 bb) iw) (nth 1 (assoc ps doc-view-paper-sizes)))
1196         (/ (* (nth 1 bb) ih) (nth 2 (assoc ps doc-view-paper-sizes)))
1197         (/ (* (nth 2 bb) iw) (nth 1 (assoc ps doc-view-paper-sizes)))
1198         (/ (* (nth 3 bb) ih) (nth 2 (assoc ps doc-view-paper-sizes)))))
1199
1200 (defun doc-view-set-slice-from-bounding-box (&optional force-paper-size)
1201   "Set the slice from the document's BoundingBox information.
1202 The result is that the margins are almost completely cropped,
1203 much more accurate than could be done manually using
1204 `doc-view-set-slice-using-mouse'."
1205   (interactive "P")
1206   (let ((bb (doc-view-get-bounding-box)))
1207     (if (not bb)
1208         (message "BoundingBox couldn't be determined")
1209       (let* ((is (image-size (doc-view-current-image) t))
1210              (iw (car is))
1211              (ih (cdr is))
1212              (ps (or (and (null force-paper-size)
1213                           (doc-view-guess-paper-size iw ih))
1214                      (intern (completing-read "Paper size: "
1215                                               doc-view-paper-sizes
1216                                               nil t))))
1217              (bb (doc-view-scale-bounding-box ps iw ih bb))
1218              (x1 (nth 0 bb))
1219              (y1 (nth 1 bb))
1220              (x2 (nth 2 bb))
1221              (y2 (nth 3 bb)))
1222         ;; We keep a 2 pixel margin.
1223         (doc-view-set-slice (- x1 2) (- ih y2 2)
1224                             (+ (- x2 x1) 4) (+ (- y2 y1) 4))))))
1225
1226 (defun doc-view-reset-slice ()
1227   "Reset the current slice.
1228 After calling this function whole pages will be visible again."
1229   (interactive)
1230   (setf (doc-view-current-slice) nil)
1231   ;; Redisplay
1232   (doc-view-goto-page (doc-view-current-page)))
1233
1234 ;;;; Display
1235
1236 (defun doc-view-insert-image (file &rest args)
1237   "Insert the given png FILE.
1238 ARGS is a list of image descriptors."
1239   (when doc-view-pending-cache-flush
1240     (clear-image-cache)
1241     (setq doc-view-pending-cache-flush nil))
1242   (let ((ol (doc-view-current-overlay))
1243         (image (if (and file (file-readable-p file))
1244                    (if (not (and doc-view-scale-internally
1245                                  (fboundp 'imagemagick-types)))
1246                        (apply 'create-image file doc-view--image-type nil args)
1247                      (unless (member :width args)
1248                        (setq args `(,@args :width ,doc-view-image-width)))
1249                      (apply 'create-image file 'imagemagick nil args))))
1250         (slice (doc-view-current-slice)))
1251     (setf (doc-view-current-image) image)
1252     (move-overlay ol (point-min) (point-max))
1253     (overlay-put ol 'display
1254                  (cond
1255                   (image
1256                    (if slice
1257                        (list (cons 'slice slice) image)
1258                      image))
1259                   ;; We're trying to display a page that doesn't exist.
1260                   (doc-view-current-converter-processes
1261                    ;; Maybe the page doesn't exist *yet*.
1262                    "Cannot display this page (yet)!")
1263                   (t
1264                    ;; Typically happens if the conversion process somehow
1265                    ;; failed.  Better not signal an error here because it
1266                    ;; could prevent a subsequent reconversion from fixing
1267                    ;; the problem.
1268                    (concat "Cannot display this page!\n"
1269                            "Maybe because of a conversion failure!"))))
1270     (let ((win (overlay-get ol 'window)))
1271       (if (stringp (overlay-get ol 'display))
1272           (progn            ;Make sure the text is not scrolled out of view.
1273             (set-window-hscroll win 0)
1274             (set-window-vscroll win 0))
1275         (let ((hscroll (image-mode-window-get 'hscroll win))
1276               (vscroll (image-mode-window-get 'vscroll win)))
1277           ;; Reset scroll settings, in case they were changed.
1278           (if hscroll (set-window-hscroll win hscroll))
1279           (if vscroll (set-window-vscroll win vscroll)))))))
1280
1281 (defun doc-view-sort (a b)
1282   "Return non-nil if A should be sorted before B.
1283 Predicate for sorting `doc-view-current-files'."
1284   (or (< (length a) (length b))
1285       (and (= (length a) (length b))
1286            (string< a b))))
1287
1288 (defun doc-view-display (buffer &optional force)
1289   "Start viewing the document in BUFFER.
1290 If FORCE is non-nil, start viewing even if the document does not
1291 have the page we want to view."
1292   (with-current-buffer buffer
1293     (let ((prev-pages doc-view-current-files))
1294       (setq doc-view-current-files
1295             (sort (directory-files (doc-view-current-cache-dir) t
1296                                    (format doc-view--image-file-pattern
1297                                            "[0-9]+")
1298                                    t)
1299                   'doc-view-sort))
1300       (unless (eq (length prev-pages) (length doc-view-current-files))
1301         (force-mode-line-update))
1302       (dolist (win (or (get-buffer-window-list buffer nil t)
1303                        (list t)))
1304         (let* ((page (doc-view-current-page win))
1305                (pagefile (expand-file-name
1306                           (format doc-view--image-file-pattern page)
1307                           (doc-view-current-cache-dir))))
1308           (when (or force
1309                     (and (not (member pagefile prev-pages))
1310                          (member pagefile doc-view-current-files)))
1311             (if (windowp win)
1312                 (with-selected-window win
1313                   (cl-assert (eq (current-buffer) buffer) t)
1314                   (doc-view-goto-page page))
1315               (doc-view-goto-page page))))))))
1316
1317 (defun doc-view-buffer-message ()
1318   ;; Only show this message initially, not when refreshing the buffer (in which
1319   ;; case it's better to keep displaying the "stale" page while computing
1320   ;; the fresh new ones).
1321   (unless (overlay-get (doc-view-current-overlay) 'display)
1322     (overlay-put (doc-view-current-overlay) 'display
1323                  (concat (propertize "Welcome to DocView!" 'face 'bold)
1324                          "\n"
1325                          "
1326 If you see this buffer it means that the document you want to view is being
1327 converted to PNG and the conversion of the first page hasn't finished yet or
1328 `doc-view-conversion-refresh-interval' is set to nil.
1329
1330 For now these keys are useful:
1331
1332 `q' : Bury this buffer.  Conversion will go on in background.
1333 `k' : Kill the conversion process and this buffer.
1334 `K' : Kill the conversion process.\n"))))
1335
1336 (declare-function tooltip-show "tooltip" (text &optional use-echo-area))
1337
1338 (defun doc-view-show-tooltip ()
1339   (interactive)
1340   (tooltip-show (doc-view-current-info)))
1341
1342 (defun doc-view-open-text ()
1343   "Open a buffer with the current doc's contents as text."
1344   (interactive)
1345   (if doc-view-current-converter-processes
1346       (message "DocView: please wait till conversion finished.")
1347     (let ((txt (expand-file-name "doc.txt" (doc-view-current-cache-dir))))
1348       (if (file-readable-p txt)
1349           (let ((name (concat "Text contents of "
1350                               (file-name-nondirectory buffer-file-name)))
1351                 (dir (file-name-directory buffer-file-name)))
1352             (with-current-buffer (find-file txt)
1353               (rename-buffer name)
1354               (setq default-directory dir)))
1355         (doc-view-doc->txt txt 'doc-view-open-text)))))
1356
1357 ;;;;; Toggle between editing and viewing
1358
1359 (defvar-local doc-view-saved-settings nil
1360   "Doc-view settings saved while in some other mode.")
1361 (put 'doc-view-saved-settings 'permanent-local t)
1362
1363 (defun doc-view-toggle-display ()
1364   "Toggle between editing a document as text or viewing it."
1365   (interactive)
1366   (if (eq major-mode 'doc-view-mode)
1367       ;; Switch to editing mode
1368       (progn
1369         (doc-view-kill-proc)
1370         (setq buffer-read-only nil)
1371         (remove-overlays (point-min) (point-max) 'doc-view t)
1372         (setq-local image-mode-winprops-alist t)
1373         ;; Switch to the previously used major mode or fall back to
1374         ;; normal mode.
1375         (doc-view-fallback-mode)
1376         (doc-view-minor-mode 1))
1377     ;; Switch to doc-view-mode
1378     (when (and (buffer-modified-p)
1379                (y-or-n-p "The buffer has been modified.  Save the changes? "))
1380       (save-buffer))
1381     (doc-view-mode)))
1382
1383 ;;;; Searching
1384
1385
1386 (defun doc-view-search-internal (regexp file)
1387   "Return a list of FILE's pages that contain text matching REGEXP.
1388 The value is an alist of the form (PAGE CONTEXTS) where PAGE is
1389 the pagenumber and CONTEXTS are all lines of text containing a match."
1390   (with-temp-buffer
1391     (insert-file-contents file)
1392     (let ((page 1)
1393           (lastpage 1)
1394           matches)
1395       (while (re-search-forward (concat "\\(?:\\([\f]\\)\\|\\("
1396                                         regexp "\\)\\)") nil t)
1397         (when (match-string 1) (setq page (1+ page)))
1398         (when (match-string 2)
1399           (if (/= page lastpage)
1400               (push (cons page
1401                           (list (buffer-substring
1402                                  (line-beginning-position)
1403                                  (line-end-position))))
1404                     matches)
1405             (setq matches (cons
1406                            (append
1407                             (or
1408                              ;; This page already is a match.
1409                              (car matches)
1410                              ;; This is the first match on page.
1411                              (list page))
1412                             (list (buffer-substring
1413                                    (line-beginning-position)
1414                                    (line-end-position))))
1415                            (cdr matches))))
1416           (setq lastpage page)))
1417       (nreverse matches))))
1418
1419 (defun doc-view-search-no-of-matches (list)
1420   "Extract the number of matches from the search result LIST."
1421   (let ((no 0))
1422     (dolist (p list)
1423       (setq no (+ no (1- (length p)))))
1424     no))
1425
1426 (defun doc-view-search-backward (new-query)
1427   "Call `doc-view-search' for backward search.
1428 If prefix NEW-QUERY is given, ask for a new regexp."
1429   (interactive "P")
1430   (doc-view-search new-query t))
1431
1432 (defun doc-view-search (new-query &optional backward)
1433   "Jump to the next match or initiate a new search if NEW-QUERY is given.
1434 If the current document hasn't been transformed to plain text
1435 till now do that first.
1436 If BACKWARD is non-nil, jump to the previous match."
1437   (interactive "P")
1438   (if (and (not new-query)
1439            doc-view-current-search-matches)
1440       (if backward
1441           (doc-view-search-previous-match 1)
1442         (doc-view-search-next-match 1))
1443     ;; New search, so forget the old results.
1444     (setq doc-view-current-search-matches nil)
1445     (let ((txt (expand-file-name "doc.txt"
1446                                  (doc-view-current-cache-dir))))
1447       (if (file-readable-p txt)
1448           (progn
1449             (setq doc-view-current-search-matches
1450                   (doc-view-search-internal
1451                    (read-from-minibuffer "Regexp: ")
1452                    txt))
1453             (message "DocView: search yielded %d matches."
1454                      (doc-view-search-no-of-matches
1455                       doc-view-current-search-matches)))
1456         ;; We must convert to TXT first!
1457         (if doc-view-current-converter-processes
1458             (message "DocView: please wait till conversion finished.")
1459           (doc-view-doc->txt txt (lambda () (doc-view-search nil))))))))
1460
1461 (defun doc-view-search-next-match (arg)
1462   "Go to the ARGth next matching page."
1463   (interactive "p")
1464   (let* ((next-pages (doc-view-remove-if
1465                       (lambda (i) (<= (car i) (doc-view-current-page)))
1466                       doc-view-current-search-matches))
1467          (page (car (nth (1- arg) next-pages))))
1468     (if page
1469         (doc-view-goto-page page)
1470       (when (and
1471              doc-view-current-search-matches
1472              (y-or-n-p "No more matches after current page.  Wrap to first match? "))
1473         (doc-view-goto-page (caar doc-view-current-search-matches))))))
1474
1475 (defun doc-view-search-previous-match (arg)
1476   "Go to the ARGth previous matching page."
1477   (interactive "p")
1478   (let* ((prev-pages (doc-view-remove-if
1479                       (lambda (i) (>= (car i) (doc-view-current-page)))
1480                       doc-view-current-search-matches))
1481          (page (car (nth (1- arg) (nreverse prev-pages)))))
1482     (if page
1483         (doc-view-goto-page page)
1484       (when (and
1485              doc-view-current-search-matches
1486              (y-or-n-p "No more matches before current page.  Wrap to last match? "))
1487         (doc-view-goto-page (caar (last doc-view-current-search-matches)))))))
1488
1489 ;;;; User interface commands and the mode
1490
1491 (put 'doc-view-mode 'mode-class 'special)
1492
1493 (defun doc-view-already-converted-p ()
1494   "Return non-nil if the current doc was already converted."
1495   (and (file-exists-p (doc-view-current-cache-dir))
1496        ;; Check that the resolution info is there, otherwise it means
1497        ;; the conversion is incomplete.
1498        (file-readable-p (expand-file-name "resolution.el"
1499                                           (doc-view-current-cache-dir)))
1500        (> (length (directory-files
1501                    (doc-view-current-cache-dir)
1502                    nil (format doc-view--image-file-pattern "[0-9]+")))
1503           0)))
1504
1505 (defun doc-view-initiate-display ()
1506   ;; Switch to image display if possible.
1507   (if (doc-view-mode-p doc-view-doc-type)
1508       (progn
1509         (doc-view-buffer-message)
1510         (setf (doc-view-current-page) (or (doc-view-current-page) 1))
1511         (if (doc-view-already-converted-p)
1512             (progn
1513               (message "DocView: using cached files!")
1514               ;; Load the saved resolution.
1515               (let* ((res-file (expand-file-name "resolution.el"
1516                                                  (doc-view-current-cache-dir)))
1517                      (res
1518                       (with-temp-buffer
1519                         (when (file-readable-p res-file)
1520                           (insert-file-contents res-file)
1521                           (read (current-buffer))))))
1522                 (when (numberp res)
1523                   (setq-local doc-view-resolution res)))
1524               (doc-view-display (current-buffer) 'force))
1525           (doc-view-convert-current-doc))
1526         (message
1527          "%s"
1528          (substitute-command-keys
1529           (concat "Type \\[doc-view-toggle-display] to toggle between "
1530                   "editing or viewing the document."))))
1531     (message
1532      "%s"
1533      (concat "No PNG support is available, or some conversion utility for "
1534              (file-name-extension doc-view-buffer-file-name)
1535              " files is missing."))
1536     (when (and (executable-find doc-view-pdftotext-program)
1537                (y-or-n-p
1538                 "Unable to render file.  View extracted text instead? "))
1539       (doc-view-open-text))
1540     (doc-view-toggle-display)))
1541
1542 (defvar bookmark-make-record-function)
1543
1544 (defun doc-view-clone-buffer-hook ()
1545   ;; FIXME: There are several potential problems linked with reconversion
1546   ;; and auto-revert when we have indirect buffers because they share their
1547   ;; /tmp cache directory.  This sharing is good (you'd rather not reconvert
1548   ;; for each clone), but that means that clones need to collaborate a bit.
1549   ;; I guess it mostly means: detect when a reconversion process is already
1550   ;; running, and run the sentinel in all clones.
1551   ;;
1552   ;; Maybe the clones should really have a separate /tmp directory
1553   ;; so they could have a different resolution and you could use clones
1554   ;; for zooming.
1555   (remove-overlays (point-min) (point-max) 'doc-view t)
1556   (if (consp image-mode-winprops-alist) (setq image-mode-winprops-alist nil)))
1557
1558 (defun doc-view-intersection (l1 l2)
1559   (let ((l ()))
1560     (dolist (x l1) (if (memq x l2) (push x l)))
1561     l))
1562
1563 (defun doc-view-set-doc-type ()
1564   "Figure out the current document type (`doc-view-doc-type')."
1565   (let ((name-types
1566          (when buffer-file-name
1567            (cdr (assoc (file-name-extension buffer-file-name)
1568                        '(
1569                          ;; DVI
1570                          ("dvi" dvi)
1571                          ;; PDF
1572                          ("pdf" pdf) ("epdf" pdf)
1573                          ;; PostScript
1574                          ("ps" ps) ("eps" ps)
1575                          ;; DjVu
1576                          ("djvu" djvu)
1577                          ;; OpenDocument formats
1578                          ("odt" odf) ("ods" odf) ("odp" odf) ("odg" odf)
1579                          ("odc" odf) ("odi" odf) ("odm" odf) ("ott" odf)
1580                          ("ots" odf) ("otp" odf) ("otg" odf)
1581                          ;; Microsoft Office formats (also handled
1582                          ;; by the odf conversion chain)
1583                          ("doc" odf) ("docx" odf) ("xls" odf) ("xlsx" odf)
1584                          ("ppt" odf) ("pptx" odf))))))
1585         (content-types
1586          (save-excursion
1587            (goto-char (point-min))
1588            (cond
1589             ((looking-at "%!") '(ps))
1590             ((looking-at "%PDF") '(pdf))
1591             ((looking-at "\367\002") '(dvi))
1592             ((looking-at "AT&TFORM") '(djvu))))))
1593     (setq-local doc-view-doc-type
1594         (car (or (doc-view-intersection name-types content-types)
1595                  (when (and name-types content-types)
1596                    (error "Conflicting types: name says %s but content says %s"
1597                           name-types content-types))
1598                  name-types content-types
1599                  (error "Cannot determine the document type"))))))
1600
1601 (defun doc-view-set-up-single-converter ()
1602   "Find the right single-page converter for the current document type"
1603   (pcase-let ((`(,conv-function ,type ,extension)
1604                (pcase doc-view-doc-type
1605                  (`djvu (list #'doc-view-djvu->tiff-converter-ddjvu 'tiff "tif"))
1606                  (_     (list doc-view-pdf->png-converter-function  'png  "png")))))
1607     (setq-local doc-view-single-page-converter-function conv-function)
1608     (setq-local doc-view--image-type type)
1609     (setq-local doc-view--image-file-pattern (concat "page-%s." extension))))
1610
1611 ;;;###autoload
1612 (defun doc-view-mode ()
1613   "Major mode in DocView buffers.
1614
1615 DocView Mode is an Emacs document viewer.  It displays PDF, PS
1616 and DVI files (as PNG images) in Emacs buffers.
1617
1618 You can use \\<doc-view-mode-map>\\[doc-view-toggle-display] to
1619 toggle between displaying the document or editing it as text.
1620 \\{doc-view-mode-map}"
1621   (interactive)
1622
1623   (if (= (point-min) (point-max))
1624       ;; The doc is empty or doesn't exist at all, so fallback to
1625       ;; another mode.  We used to also check file-exists-p, but this
1626       ;; returns nil for tar members.
1627       (doc-view-fallback-mode)
1628
1629     (let* ((prev-major-mode (if (derived-mode-p 'doc-view-mode)
1630                                 doc-view-previous-major-mode
1631                               (unless (eq major-mode 'fundamental-mode)
1632                                 major-mode))))
1633       (kill-all-local-variables)
1634       (setq-local doc-view-previous-major-mode prev-major-mode))
1635
1636     (dolist (var doc-view-saved-settings)
1637       (set (make-local-variable (car var)) (cdr var)))
1638
1639     ;; Figure out the document type.
1640     (unless doc-view-doc-type
1641       (doc-view-set-doc-type))
1642     (doc-view-set-up-single-converter)
1643
1644     (doc-view-make-safe-dir doc-view-cache-directory)
1645     ;; Handle compressed files, remote files, files inside archives
1646     (setq-local doc-view-buffer-file-name
1647          (cond
1648           (jka-compr-really-do-compress
1649            ;; FIXME: there's a risk of name conflicts here.
1650            (expand-file-name
1651             (file-name-nondirectory
1652              (file-name-sans-extension buffer-file-name))
1653             doc-view-cache-directory))
1654           ;; Is the file readable by local processes?
1655           ;; We used to use `file-remote-p' but it's unclear what it's
1656           ;; supposed to return nil for things like local files accessed via
1657           ;; `su' or via file://...
1658           ((let ((file-name-handler-alist nil))
1659              (not (and buffer-file-name (file-readable-p buffer-file-name))))
1660            ;; FIXME: there's a risk of name conflicts here.
1661            (expand-file-name
1662             (if buffer-file-name
1663                 (file-name-nondirectory buffer-file-name)
1664               (buffer-name))
1665             doc-view-cache-directory))
1666           (t buffer-file-name)))
1667     (when (not (string= doc-view-buffer-file-name buffer-file-name))
1668       (write-region nil nil doc-view-buffer-file-name))
1669
1670     (add-hook 'change-major-mode-hook
1671               (lambda ()
1672                 (doc-view-kill-proc)
1673                 (remove-overlays (point-min) (point-max) 'doc-view t))
1674               nil t)
1675     (add-hook 'clone-indirect-buffer-hook 'doc-view-clone-buffer-hook nil t)
1676     (add-hook 'kill-buffer-hook 'doc-view-kill-proc nil t)
1677
1678     (remove-overlays (point-min) (point-max) 'doc-view t) ;Just in case.
1679     ;; Keep track of display info ([vh]scroll, page number, overlay,
1680     ;; ...)  for each window in which this document is shown.
1681     (add-hook 'image-mode-new-window-functions
1682               'doc-view-new-window-function nil t)
1683     (image-mode-setup-winprops)
1684
1685     (setq-local mode-line-position
1686                 '(" P" (:eval (number-to-string (doc-view-current-page)))
1687                   "/" (:eval (number-to-string (doc-view-last-page-number)))))
1688     ;; Don't scroll unless the user specifically asked for it.
1689     (setq-local auto-hscroll-mode nil)
1690     (setq-local mwheel-scroll-up-function #'doc-view-scroll-up-or-next-page)
1691     (setq-local mwheel-scroll-down-function
1692                 #'doc-view-scroll-down-or-previous-page)
1693     (setq-local cursor-type nil)
1694     (use-local-map doc-view-mode-map)
1695     (add-hook 'after-revert-hook 'doc-view-reconvert-doc nil t)
1696     (setq-local bookmark-make-record-function
1697                 #'doc-view-bookmark-make-record)
1698     (setq mode-name "DocView"
1699           buffer-read-only t
1700           major-mode 'doc-view-mode)
1701     (doc-view-initiate-display)
1702     ;; Switch off view-mode explicitly, because doc-view-mode is the
1703     ;; canonical view mode for PDF/PS/DVI files.  This could be
1704     ;; switched on automatically depending on the value of
1705     ;; `view-read-only'.
1706     (setq-local view-read-only nil)
1707     (run-mode-hooks 'doc-view-mode-hook)))
1708
1709 (defun doc-view-fallback-mode ()
1710   "Fallback to the previous or next best major mode."
1711   (let ((vars (if (derived-mode-p 'doc-view-mode)
1712                   (mapcar (lambda (var) (cons var (symbol-value var)))
1713                           '(doc-view-resolution
1714                             image-mode-winprops-alist)))))
1715     (if doc-view-previous-major-mode
1716         (funcall doc-view-previous-major-mode)
1717       (let ((auto-mode-alist
1718              (rassq-delete-all
1719               'doc-view-mode-maybe
1720               (rassq-delete-all 'doc-view-mode
1721                                 (copy-alist auto-mode-alist)))))
1722         (normal-mode)))
1723     (when vars
1724       (setq-local doc-view-saved-settings vars))))
1725
1726 ;;;###autoload
1727 (defun doc-view-mode-maybe ()
1728   "Switch to `doc-view-mode' if possible.
1729 If the required external tools are not available, then fallback
1730 to the next best mode."
1731   (condition-case nil
1732       (doc-view-set-doc-type)
1733     (error (doc-view-fallback-mode)))
1734   (if (doc-view-mode-p doc-view-doc-type)
1735       (doc-view-mode)
1736     (doc-view-fallback-mode)))
1737
1738 ;;;###autoload
1739 (define-minor-mode doc-view-minor-mode
1740   "Toggle displaying buffer via Doc View (Doc View minor mode).
1741 With a prefix argument ARG, enable Doc View minor mode if ARG is
1742 positive, and disable it otherwise.  If called from Lisp, enable
1743 the mode if ARG is omitted or nil.
1744
1745 See the command `doc-view-mode' for more information on this mode."
1746   nil " DocView" doc-view-minor-mode-map
1747   :group 'doc-view
1748   (when doc-view-minor-mode
1749     (add-hook 'change-major-mode-hook (lambda () (doc-view-minor-mode -1)) nil t)
1750     (message
1751      "%s"
1752      (substitute-command-keys
1753       "Type \\[doc-view-toggle-display] to toggle between editing or viewing the document."))))
1754
1755 (defun doc-view-clear-cache ()
1756   "Delete the whole cache (`doc-view-cache-directory')."
1757   (interactive)
1758   (dired-delete-file doc-view-cache-directory 'always))
1759
1760 (defun doc-view-dired-cache ()
1761   "Open `dired' in `doc-view-cache-directory'."
1762   (interactive)
1763   (dired doc-view-cache-directory))
1764
1765
1766 ;;;; Bookmark integration
1767
1768 (declare-function bookmark-make-record-default
1769                   "bookmark" (&optional no-file no-context posn))
1770 (declare-function bookmark-prop-get "bookmark" (bookmark prop))
1771 (declare-function bookmark-default-handler "bookmark" (bmk))
1772
1773 (defun doc-view-bookmark-make-record ()
1774   (nconc (bookmark-make-record-default)
1775          `((page     . ,(doc-view-current-page))
1776            (handler  . doc-view-bookmark-jump))))
1777
1778
1779 ;;;###autoload
1780 (defun doc-view-bookmark-jump (bmk)
1781   ;; This implements the `handler' function interface for record type
1782   ;; returned by `doc-view-bookmark-make-record', which see.
1783   (prog1 (bookmark-default-handler bmk)
1784     (let ((page (bookmark-prop-get bmk 'page)))
1785       (when (not (eq major-mode 'doc-view-mode))
1786         (doc-view-toggle-display))
1787       (with-selected-window
1788        (or (get-buffer-window (current-buffer) 0)
1789            (selected-window))
1790        (doc-view-goto-page page)))))
1791
1792
1793 (provide 'doc-view)
1794
1795 ;; Local Variables:
1796 ;; eval: (outline-minor-mode 1)
1797 ;; End:
1798
1799 ;;; doc-view.el ends here