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doc-view.el
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doc-view.el
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;doc-view.el --- Document viewer for Emacs -*- lexical-binding: t -*-
;; Copyright (C) 2007-2022 Free Software Foundation, Inc.
;;
;; Author: Tassilo Horn <[email protected]>
;; Keywords: files, pdf, ps, dvi, djvu, epub, cbz, fb2, xps, openxps
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Requirements:
;; Viewing PS/PDF/DVI files requires Ghostscript, `dvipdf' (comes with
;; Ghostscript) or `dvipdfm' (comes with teTeX or TeXLive) and
;; `pdftotext', which comes with xpdf (https://www.foolabs.com/xpdf/)
;; or poppler (https://poppler.freedesktop.org/). EPUB, CBZ, FB2, XPS
;; and OXPS documents require `mutool' which comes with mupdf
;; (https://mupdf.com/index.html). Djvu documents require `ddjvu'
;; (from DjVuLibre). ODF files require `soffice' (from LibreOffice).
;;; Commentary:
;; DocView is a document viewer for Emacs. It converts a number of
;; document formats (including PDF, PS, DVI, Djvu, ODF, EPUB, CBZ,
;; FB2, XPS and OXPS files) to a set of PNG (or TIFF for djvu) files,
;; one image for each page, and displays the images inside an Emacs
;; buffer. This buffer uses `doc-view-mode' which provides convenient
;; key bindings for browsing the document.
;;
;; To use it simply open a document file with
;;
;; C-x C-f ~/path/to/document RET
;;
;; and the document will be converted and displayed, if your Emacs supports PNG
;; images. With `C-c C-c' you can toggle between the rendered images
;; representation and the source text representation of the document.
;;
;; Since conversion may take some time all the PNG images are cached in a
;; subdirectory of `doc-view-cache-directory' and reused when you want to view
;; that file again. To reconvert a document hit `g' (`doc-view-reconvert-doc')
;; when displaying the document. To delete all cached files use
;; `doc-view-clear-cache'. To open the cache with dired, so that you can tidy
;; it out use `doc-view-dired-cache'.
;;
;; When conversion is underway the first page will be displayed as soon as it
;; is available and the available pages are refreshed every
;; `doc-view-conversion-refresh-interval' seconds. If that variable is nil the
;; pages won't be displayed before conversion of the document finished
;; completely.
;;
;; DocView lets you select a slice of the displayed pages. This slice
;; will be remembered and applied to all pages of the current
;; document. This enables you to cut away the margins of a document
;; to save some space. To select a slice you can use
;; `doc-view-set-slice' (bound to `c s') which will query you for the
;; coordinates of the slice's top-left corner and its width and
;; height. A much more convenient way to do the same is offered by
;; the command `doc-view-set-slice-using-mouse' (bound to `c m').
;; After invocation you only have to press mouse-1 at the top-left
;; corner and drag it to the bottom-right corner of the desired slice.
;; Even more accurate and convenient is to use
;; `doc-view-set-slice-from-bounding-box' (bound to `c b') which uses
;; the BoundingBox information of the current page to set an optimal
;; slice. To reset the slice use `doc-view-reset-slice' (bound to `c
;; r').
;;
;; You can also search within the document. The command `doc-view-search'
;; (bound to `C-s') queries for a search regexp and initializes a list of all
;; matching pages and messages how many match-pages were found. After that you
;; can jump to the next page containing a match with an additional `C-s'. With
;; `C-r' you can do the same, but backwards. To search for a new regexp give a
;; prefix arg to one of the search functions, e.g. by typing `C-u C-s'. The
;; searching works by using a plain text representation of the document. If
;; that doesn't already exist the first invocation of `doc-view-search' (or
;; `doc-view-search-backward') starts the conversion. When that finishes and
;; you're still viewing the document (i.e. you didn't switch to another buffer)
;; you're queried for the regexp then.
;;
;; Dired users can simply hit `v' on a document file. If it's a PS, PDF or DVI
;; it will be opened using `doc-view-mode'.
;;
;;; Configuration:
;; If the images are too small or too big you should set the "-rXXX" option in
;; `doc-view-ghostscript-options' to another value. (The bigger your screen,
;; the higher the value.)
;;
;; This and all other options can be set with the customization interface.
;; Simply do
;;
;; M-x customize-group RET doc-view RET
;;
;; and modify them to your needs.
;;; Todo:
;; - add print command.
;; - share more code with image-mode.
;; - better menu.
;; - Bind slicing to a drag event.
;; - zoom the region around the cursor (like xdvi).
;; - get rid of the silly arrow in the fringe.
;; - improve anti-aliasing (pdf-utils gets it better).
;;;; About isearch support
;; I tried implementing isearch by setting
;; `isearch-search-fun-function' buffer-locally, but that didn't
;; work too good. The function doing the real search was called
;; endlessly somehow. But even if we'd get that working no real
;; isearch feeling comes up due to the missing match highlighting.
;; Currently I display all lines containing a match in a tooltip and
;; each C-s or C-r jumps directly to the next/previous page with a
;; match. With isearch we could only display the current match. So
;; we had to decide if another C-s jumps to the next page with a
;; match (thus only the first match in a page will be displayed in a
;; tooltip) or to the next match, which would do nothing visible
;; (except the tooltip) if the next match is on the same page.
;; And it's much slower than the current search facility, because
;; isearch really searches for each step forward or backward whereas
;; the current approach searches once and then it knows to which
;; pages to jump.
;; Anyway, if someone with better isearch knowledge wants to give it a try,
;; feel free to do it. --Tassilo
;;; Code:
(require 'cl-lib)
(require 'dired)
(require 'image-mode)
(require 'jka-compr)
(eval-when-compile
(require 'subr-x)
(require 'image-roll))
;;;; Customization Options
(defgroup doc-view nil
"In-buffer document viewer.
The viewer handles PDF, PostScript, DVI, DJVU, ODF, EPUB, CBZ,
FB2, XPS and OXPS files, if the appropriate converter programs
are available (see Info node `(emacs)Document View')"
:link '(function-link doc-view)
:version "22.2"
:group 'applications
:group 'data
:group 'multimedia
:prefix "doc-view-")
(defcustom doc-view-ghostscript-program
(cond
((memq system-type '(windows-nt ms-dos))
(cond
;; Windows Ghostscript
((executable-find "gswin64c") "gswin64c")
((executable-find "gswin32c") "gswin32c")
;; The GS wrapper coming with TeX Live
((executable-find "rungs") "rungs")
;; The MikTeX builtin GS Check if mgs is functional for external
;; non-MikTeX apps. Was available under:
;; http:https://blog.miktex.org/post/2005/04/07/Starting-mgsexe-at-the-DOS-Prompt.aspx
((and (executable-find "mgs")
(= 0 (shell-command "mgs -q -dNODISPLAY -c quit")))
"mgs")))
(t "gs"))
"Program to convert PS and PDF files to PNG."
:type 'file
:version "27.1")
(defcustom doc-view-pdfdraw-program
(cond
((executable-find "pdfdraw") "pdfdraw")
((executable-find "mudraw") "mudraw")
((executable-find "mutool") "mutool")
(t "mudraw"))
"Name of MuPDF's program to convert PDF files to PNG."
:type 'file
:version "24.4")
(defcustom doc-view-pdftotext-program-args '("-raw")
"Parameters to give to the pdftotext command."
:version "27.1"
:type '(repeat string))
(defcustom doc-view-pdf->png-converter-function
(if (executable-find doc-view-pdfdraw-program)
#'doc-view-pdf->png-converter-mupdf
#'doc-view-pdf->png-converter-ghostscript)
"Function to call to convert a PDF file into a PNG file."
:type '(radio
(function-item doc-view-pdf->png-converter-ghostscript
:doc "Use ghostscript")
(function-item doc-view-pdf->png-converter-mupdf
:doc "Use mupdf")
function)
:version "24.4")
(defcustom doc-view-ghostscript-options
'("-dSAFER" ;; Avoid security problems when rendering files from untrusted
;; sources.
"-dNOPAUSE" "-dTextAlphaBits=4"
"-dBATCH" "-dGraphicsAlphaBits=4" "-dQUIET")
"A list of options to give to ghostscript."
:type '(repeat string))
(defcustom doc-view-ghostscript-device "png16m"
"Output device to give to ghostscript."
:type 'string
:version "27.1")
(defcustom doc-view-resolution 150
"Dots per inch resolution used to render the documents.
Higher values result in larger images."
:type 'number)
(defcustom doc-view-mutool-user-stylesheet nil
"User stylesheet to use when converting EPUB documents to PDF."
:type '(choice (const nil)
(file :must-match t))
:version "29.1")
(defvar doc-view-doc-type nil
"The type of document in the current buffer.
Can be `dvi', `pdf', `ps', `djvu', `odf', `epub', `cbz', `fb2',
`xps' or `oxps'.")
;; FIXME: The doc-view-current-* definitions below are macros because they
;; map to accessors which we want to use via `setf' as well!
(defmacro doc-view-current-page (&optional win)
`(image-mode-window-get 'page ,win))
(defmacro doc-view-current-info () '(image-mode-window-get 'info))
(defmacro doc-view-current-overlay () '(image-mode-window-get 'overlay))
(defmacro doc-view-current-image () '(image-mode-window-get 'image))
(defmacro doc-view-current-slice () '(image-mode-window-get 'slice))
(defvar-local doc-view--current-cache-dir nil
"Only used internally.")
(defun doc-view-custom-set-epub-font-size (option-name new-value)
(set-default option-name new-value)
(dolist (x (buffer-list))
(with-current-buffer x
(when (eq doc-view-doc-type 'epub)
(delete-directory doc-view--current-cache-dir t)
(doc-view-initiate-display)
(doc-view-goto-page (doc-view-current-page))))))
(defcustom doc-view-epub-font-size nil
"Font size in points for EPUB layout."
:type '(choice (const nil) integer)
:set #'doc-view-custom-set-epub-font-size
:version "29.1")
(defcustom doc-view-scale-internally t
"Whether we should try to rescale images ourselves.
If nil, the document is re-rendered every time the scaling factor is modified.
This only has an effect if the image libraries linked with Emacs support
scaling."
:version "24.4"
:type 'boolean)
(defcustom doc-view-image-width 1200
"Default image width.
Has only an effect if `doc-view-scale-internally' is non-nil and support for
scaling is compiled into Emacs."
:version "24.1"
:type 'number)
(defcustom doc-view-dvipdfm-program "dvipdfm"
"Program to convert DVI files to PDF.
DVI file will be converted to PDF before the resulting PDF is
converted to PNG.
If this and `doc-view-dvipdf-program' are set,
`doc-view-dvipdf-program' will be preferred."
:type 'file)
(defcustom doc-view-dvipdf-program "dvipdf"
"Program to convert DVI files to PDF.
DVI file will be converted to PDF before the resulting PDF is
converted to PNG.
If this and `doc-view-dvipdfm-program' are set,
`doc-view-dvipdf-program' will be preferred."
:type 'file)
(define-obsolete-variable-alias 'doc-view-unoconv-program 'doc-view-odf->pdf-converter-program "24.4")
(defcustom doc-view-odf->pdf-converter-program
(cond
((executable-find "soffice") "soffice")
((executable-find "unoconv") "unoconv")
(t "soffice"))
"Program to convert any file type readable by OpenOffice.org to PDF.
Needed for viewing OpenOffice.org (and MS Office) files."
:version "24.4"
:type 'file)
(defcustom doc-view-odf->pdf-converter-function
(cond
((string-match "unoconv\\'" doc-view-odf->pdf-converter-program)
#'doc-view-odf->pdf-converter-unoconv)
((string-match "soffice\\'" doc-view-odf->pdf-converter-program)
#'doc-view-odf->pdf-converter-soffice))
"Function to call to convert a ODF file into a PDF file."
:type '(radio
(function-item doc-view-odf->pdf-converter-unoconv
:doc "Use unoconv")
(function-item doc-view-odf->pdf-converter-soffice
:doc "Use LibreOffice")
function)
:version "24.4")
(defcustom doc-view-ps2pdf-program "ps2pdf"
"Program to convert PS files to PDF.
PS files will be converted to PDF before searching is possible."
:type 'file)
(defcustom doc-view-pdftotext-program "pdftotext"
"Program to convert PDF files to plain text.
Needed for searching."
:type 'file)
(defcustom doc-view-cache-directory
(expand-file-name (format "docview%d" (user-uid))
temporary-file-directory)
"The base directory, where the PNG images will be saved."
:type 'directory)
(defvar doc-view-conversion-buffer " *doc-view conversion output*"
"The buffer where messages from the converter programs go to.")
(defcustom doc-view-conversion-refresh-interval 1
"Interval in seconds between refreshes of the DocView buffer while converting.
After such a refresh newly converted pages will be available for
viewing. If set to nil there won't be any refreshes and the
pages won't be displayed before conversion of the whole document
has finished."
:type 'integer)
(defcustom doc-view-continuous nil
"In Continuous mode reaching the page edge advances to next/previous page.
When non-nil, scrolling a line upward at the bottom edge of the page
moves to the next page, and scrolling a line downward at the top edge
of the page moves to the previous page."
:type 'boolean
:version "23.2")
;;;; Internal Variables
(defvar-local doc-view--current-converter-processes nil
"Only used internally.")
(defun doc-view-new-window-function (winprops)
;; (message "New window %s for buf %s" (car winprops) (current-buffer))
(cl-assert (or (eq t (car winprops))
(eq (window-buffer (car winprops)) (current-buffer))))
(let ((ol (image-mode-window-get 'overlay winprops)))
(if ol
(progn
(setq ol (copy-overlay ol))
;; `ol' might actually be dead.
(move-overlay ol (point-min) (point-max)))
(setq ol (make-overlay (point-min) (point-max) nil t))
(overlay-put ol 'doc-view t))
(overlay-put ol 'window (car winprops))
(unless (windowp (car winprops))
;; It's a pseudo entry. Let's make sure it's not displayed (the
;; `window' property is only effective if its value is a window).
(cl-assert (eq t (car winprops)))
(delete-overlay ol))
(image-mode-window-put 'overlay ol winprops)
(when (and (windowp (car winprops))
(stringp (overlay-get ol 'display))
(null doc-view--current-converter-processes))
;; We're not displaying an image yet, so let's do so. This happens when
;; the buffer is displayed for the first time.
;; Don't do it if there's a conversion is running, since in that case, it
;; will be done later.
(with-selected-window (car winprops)
(doc-view-goto-page (image-mode-window-get 'page t))))))
(defvar-local doc-view--current-files nil
"Only used internally.")
(defvar-local doc-view--current-timer nil
"Only used internally.")
(defvar-local doc-view--current-search-matches nil
"Only used internally.")
(defvar doc-view--pending-cache-flush nil
"Only used internally.")
(defvar doc-view--buffer-file-name nil
"Only used internally.
The file name used for conversion. Normally it's the same as
`buffer-file-name', but for remote files, compressed files and
files inside an archive it is a temporary copy of
the (uncompressed, extracted) file residing in
`doc-view-cache-directory'.")
(defvar doc-view-single-page-converter-function nil
"Function to call to convert a single page of the document to a bitmap file.
May operate on the source document or on some intermediate (typically PDF)
conversion of it.")
(defvar-local doc-view--image-type nil
"The type of image in the current buffer.
Can be `png' or `tiff'.")
(defvar-local doc-view--image-file-pattern nil
"The `format' pattern of image file names.
Typically \"page-%s.png\".")
;;;; DocView Keymaps
(defvar doc-view-mode-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map image-mode-map)
;; Navigation in the document
(define-key map (kbd "n") 'doc-view-next-page)
(define-key map (kbd "p") 'doc-view-previous-page)
(define-key map (kbd "<next>") 'forward-page)
(define-key map (kbd "<prior>") 'backward-page)
(define-key map [remap forward-page] 'doc-view-next-page)
(define-key map [remap backward-page] 'doc-view-previous-page)
(define-key map (kbd "SPC") 'doc-view-scroll-up-or-next-page)
(define-key map (kbd "S-SPC") 'doc-view-scroll-down-or-previous-page)
(define-key map (kbd "DEL") 'doc-view-scroll-down-or-previous-page)
(define-key map (kbd "C-n") 'doc-view-next-line-or-next-page)
(define-key map (kbd "<down>") 'doc-view-next-line-or-next-page)
(define-key map (kbd "C-p") 'doc-view-previous-line-or-previous-page)
(define-key map (kbd "<up>") 'doc-view-previous-line-or-previous-page)
(define-key map (kbd "M-<") 'doc-view-first-page)
(define-key map (kbd "M->") 'doc-view-last-page)
(define-key map [remap goto-line] 'doc-view-goto-page)
(define-key map (kbd "RET") 'image-next-line)
;; Zoom in/out.
(define-key map "+" 'doc-view-enlarge)
(define-key map "=" 'doc-view-enlarge)
(define-key map "-" 'doc-view-shrink)
(define-key map "0" 'doc-view-scale-reset)
(define-key map [remap text-scale-adjust] 'doc-view-scale-adjust)
;; Fit the image to the window
(define-key map "W" 'doc-view-fit-width-to-window)
(define-key map "H" 'doc-view-fit-height-to-window)
(define-key map "P" 'doc-view-fit-page-to-window)
(define-key map "F" 'doc-view-fit-window-to-page) ;F = frame
;; Killing the buffer (and the process)
(define-key map (kbd "k") 'image-kill-buffer)
(define-key map (kbd "K") 'doc-view-kill-proc)
;; Slicing the image
(define-key map (kbd "c s") 'doc-view-set-slice)
(define-key map (kbd "c m") 'doc-view-set-slice-using-mouse)
(define-key map (kbd "c b") 'doc-view-set-slice-from-bounding-box)
(define-key map (kbd "c r") 'doc-view-reset-slice)
;; Centering the image
(define-key map (kbd "c h") 'doc-view-center-page-horizontally)
(define-key map (kbd "c v") 'doc-view-center-page-vertically)
;; Searching
(define-key map (kbd "C-s") 'doc-view-search)
(define-key map (kbd "<find>") 'doc-view-search)
(define-key map (kbd "C-r") 'doc-view-search-backward)
;; Show the tooltip
(define-key map (kbd "C-t") 'doc-view-show-tooltip)
;; Toggle between text and image display or editing
(define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
;; Open a new buffer with doc's text contents
(define-key map (kbd "C-c C-t") 'doc-view-open-text)
(define-key map (kbd "r") 'revert-buffer)
map)
"Keymap used by `doc-view-mode' when displaying a doc as a set of images.")
(define-obsolete-function-alias 'doc-view-revert-buffer #'revert-buffer "27.1")
(defvar revert-buffer-preserve-modes)
(defun doc-view--revert-buffer (orig-fun &rest args)
"Preserve the buffer's current mode and check PDF sanity."
(if (< undo-outer-limit (* 2 (buffer-size)))
;; It's normal for this operation to result in a very large undo entry.
(setq-local undo-outer-limit (* 2 (buffer-size))))
(cl-labels ((revert ()
(let ((revert-buffer-preserve-modes t))
(apply orig-fun args)
;; Update the cached version of the pdf file,
;; too. This is the one that's used when
;; rendering (bug#26996).
(unless (equal buffer-file-name
doc-view--buffer-file-name)
;; FIXME: Lars says he needed to recreate
;; the dir, we should figure out why.
(doc-view-make-safe-dir doc-view-cache-directory)
(write-region nil nil doc-view--buffer-file-name)))))
(if (and (eq 'pdf doc-view-doc-type)
(executable-find "pdfinfo"))
;; We don't want to revert if the PDF file is corrupted which
;; might happen when it is currently recompiled from a tex
;; file. (TODO: We'd like to have something like that also
;; for other types, at least PS, but I don't know a good way
;; to test if a PS file is complete.)
(if (= 0 (call-process "pdfinfo" nil nil nil
doc-view--buffer-file-name))
(revert)
(when (called-interactively-p 'interactive)
(message "Can't revert right now because the file is corrupted.")))
(revert))))
(easy-menu-define doc-view-menu doc-view-mode-map
"Menu for Doc View mode."
'("DocView"
["Next page" doc-view-next-page
:help "Go to the next page"]
["Previous page" doc-view-previous-page
:help "Go to the previous page"]
("Other Navigation"
["Go to page..." doc-view-goto-page
:help "Go to specific page"]
"---"
["First page" doc-view-first-page
:help "View the first page"]
["Last page" doc-view-last-page
:help "View the last page"]
"---"
["Move forward" doc-view-scroll-up-or-next-page
:help "Scroll page up or go to next page"]
["Move backward" doc-view-scroll-down-or-previous-page
:help "Scroll page down or go to previous page"])
("Continuous Scrolling"
["Off" (setq doc-view-continuous nil)
:style radio :selected (eq doc-view-continuous nil)
:help "Scrolling stops at page beginning and end"]
["On" (setq doc-view-continuous t)
:style radio :selected (eq doc-view-continuous t)
:help "Scrolling continues to next or previous page"]
"---"
["Save as Default" (customize-save-variable 'doc-view-continuous doc-view-continuous)
:help "Save current continuous scrolling option as default"]
)
"---"
("Toggle edit/display"
["Edit document" doc-view-toggle-display
:style radio :selected (eq major-mode 'doc-view--text-view-mode)]
["Display document" (lambda ()) ; ignore but show no keybinding
:style radio :selected (eq major-mode 'doc-view-mode)])
("Adjust Display"
["Fit to window" doc-view-fit-page-to-window
:help "Fit the image to the window"]
["Fit width" doc-view-fit-width-to-window
:help "Fit the image width to the window width"]
["Fit height" doc-view-fit-height-to-window
:help "Fit the image height to the window height"]
"---"
["Enlarge" doc-view-enlarge
:help "Enlarge the document"]
["Shrink" doc-view-shrink
:help "Shrink the document"]
"---"
["Set Slice" doc-view-set-slice-using-mouse
:help "Set the slice of the images that should be displayed"]
["Set Slice (BoundingBox)" doc-view-set-slice-from-bounding-box
:help "Set the slice from the document's BoundingBox information"]
["Set Slice (manual)" doc-view-set-slice
:help "Set the slice of the images that should be displayed"]
["Reset Slice" doc-view-reset-slice
:help "Reset the current slice"
:enabled (image-mode-window-get 'slice)])
"---"
["New Search" (doc-view-search t)
:help "Initiate a new search"]
["Search Forward" doc-view-search
:help "Jump to the next match or initiate a new search"]
["Search Backward" doc-view-search-backward
:help "Jump to the previous match or initiate a new search"]
))
(defvar doc-view-minor-mode-map
(let ((map (make-sparse-keymap)))
;; Toggle between text and image display or editing
(define-key map (kbd "C-c C-c") 'doc-view-toggle-display)
map)
"Keymap used by `doc-view-minor-mode'.")
(easy-menu-define doc-view-minor-mode-menu doc-view-minor-mode-map
"Menu for Doc View minor mode."
'("DocView (edit)"
("Toggle edit/display"
["Edit document" (lambda ()) ; ignore but show no keybinding
:style radio :selected (eq major-mode 'doc-view--text-view-mode)]
["Display document" doc-view-toggle-display
:style radio :selected (eq major-mode 'doc-view-mode)])
["Exit DocView Mode" doc-view-minor-mode]))
;;;; Navigation Commands
(defun doc-view-last-page-number ()
(length doc-view--current-files))
(defun doc-view-goto-page (page)
"View the page given by PAGE."
(interactive "nPage: ")
(let ((len (doc-view-last-page-number)))
(if (< page 1)
(setq page 1)
(when (and (> page len)
;; As long as the converter is running, we don't know
;; how many pages will be available.
(null doc-view--current-converter-processes))
(setq page len)))
(force-mode-line-update) ;To update `current-page'.
(setf (doc-view-current-page) page
(doc-view-current-info)
(concat
(propertize
(format "Page %d of %d." page len) 'face 'bold)
;; Tell user if converting isn't finished yet
(if doc-view--current-converter-processes
" (still converting...)\n"
"\n")
;; Display context infos if this page matches the last search
(when (and doc-view--current-search-matches
(assq page doc-view--current-search-matches))
(concat (propertize "Search matches:\n" 'face 'bold)
(let ((contexts ""))
(dolist (m (cdr (assq page
doc-view--current-search-matches)))
(setq contexts (concat contexts " - \"" m "\"\n")))
contexts)))))
;; Update the buffer
;; We used to find the file name from doc-view--current-files but
;; that's not right if the pages are not generated sequentially
;; or if the page isn't in doc-view--current-files yet.
(let ((file (expand-file-name
(format doc-view--image-file-pattern page)
(doc-view--current-cache-dir))))
(doc-view-insert-image file :pointer 'arrow)
(when (and (not (file-exists-p file))
doc-view--current-converter-processes)
;; The PNG file hasn't been generated yet.
(funcall doc-view-single-page-converter-function
doc-view--buffer-file-name file page
(let ((win (selected-window)))
(lambda ()
(and (eq (current-buffer) (window-buffer win))
;; If we changed page in the mean
;; time, don't mess things up.
(eq (doc-view-current-page win) page)
;; Make sure we don't infloop.
(file-readable-p file)
(with-selected-window win
(doc-view-goto-page page))))))))
(overlay-put (doc-view-current-overlay)
'help-echo (doc-view-current-info))))
(defun doc-view-next-page (&optional arg)
"Browse ARG pages forward."
(interactive "p")
(if doc-view-roll-minor-mode
(image-roll-next-page arg)
(doc-view-goto-page (+ (doc-view-current-page) (or arg 1)))))
(defun doc-view-previous-page (&optional arg)
"Browse ARG pages backward."
(interactive "p")
(if doc-view-roll-minor-mode
(image-roll-next-page (- arg))
(doc-view-goto-page (- (doc-view-current-page) (or arg 1)))))
(defun doc-view-first-page ()
"View the first page."
(interactive)
(doc-view-goto-page 1))
(defun doc-view-last-page ()
"View the last page."
(interactive)
(doc-view-goto-page (doc-view-last-page-number)))
(defun doc-view-scroll-up-or-next-page (&optional arg)
"Scroll page up ARG lines if possible, else goto next page.
When `doc-view-continuous' is non-nil, scrolling upward
at the bottom edge of the page moves to the next page.
Otherwise, goto next page only on typing SPC (ARG is nil)."
(interactive "P")
(if (or doc-view-continuous (null arg))
(let ((hscroll (window-hscroll))
(cur-page (doc-view-current-page)))
(when (= (window-vscroll nil t) (image-scroll-up arg))
(doc-view-next-page)
(when (/= cur-page (doc-view-current-page))
(image-bob)
(image-bol 1))
(set-window-hscroll (selected-window) hscroll)))
(image-scroll-up arg)))
(defun doc-view-scroll-down-or-previous-page (&optional arg)
"Scroll page down ARG lines if possible, else goto previous page.
When `doc-view-continuous' is non-nil, scrolling downward
at the top edge of the page moves to the previous page.
Otherwise, goto previous page only on typing DEL (ARG is nil)."
(interactive "P")
(if (or doc-view-continuous (null arg))
(let ((hscroll (window-hscroll))
(cur-page (doc-view-current-page)))
(when (= (window-vscroll nil t) (image-scroll-down arg))
(doc-view-previous-page)
(when (/= cur-page (doc-view-current-page))
(image-eob)
(image-bol 1))
(set-window-hscroll (selected-window) hscroll)))
(image-scroll-down arg)))
(defun doc-view--next-line-or-next-page (&optional arg)
"Scroll upward by ARG lines if possible, else goto next page.
When `doc-view-continuous' is non-nil, scrolling a line upward
at the bottom edge of the page moves to the next page."
(interactive "p")
(if doc-view-continuous
(let ((hscroll (window-hscroll))
(cur-page (doc-view-current-page)))
(when (= (window-vscroll nil t) (image-next-line arg))
(doc-view-next-page)
(when (/= cur-page (doc-view-current-page))
(image-bob)
(image-bol 1))
(set-window-hscroll (selected-window) hscroll)))
(image-next-line arg)))
(defun doc-view-next-line-or-next-page (&optional arg)
(interactive "p")
(if doc-view-roll-minor-mode
(dotimes (_ arg) (image-roll-scroll-forward))
(doc-view--next-line-or-next-page arg)))
(defun doc-view--previous-line-or-previous-page (&optional arg)
"Scroll downward by ARG lines if possible, else goto previous page.
When `doc-view-continuous' is non-nil, scrolling a line downward
at the top edge of the page moves to the previous page."
(interactive "p")
(if doc-view-continuous
(let ((hscroll (window-hscroll))
(cur-page (doc-view-current-page)))
(when (= (window-vscroll nil t) (image-previous-line arg))
(doc-view-previous-page)
(when (/= cur-page (doc-view-current-page))
(image-eob)
(image-bol 1))
(set-window-hscroll (selected-window) hscroll)))
(image-previous-line arg)))
(defun doc-view-previous-line-or-previous-page (&optional arg)
(interactive "p")
(if doc-view-roll-minor-mode
(dotimes (_ arg) (image-roll-scroll-backward))
(doc-view--previous-line-or-previous-page arg)))
;;;; Utility Functions
(defun doc-view-kill-proc ()
"Kill the current converter process(es)."
(interactive)
(while (consp doc-view--current-converter-processes)
(ignore-errors ;; Some entries might not be processes, and maybe
; some are dead already?
(kill-process (pop doc-view--current-converter-processes))))
(when doc-view--current-timer
(cancel-timer doc-view--current-timer)
(setq doc-view--current-timer nil))
(setq mode-line-process nil))
(define-obsolete-function-alias 'doc-view-kill-proc-and-buffer
#'image-kill-buffer "25.1")
(defun doc-view-make-safe-dir (dir)
(condition-case nil
;; Create temp files with strict access rights. It's easy to
;; loosen them later, whereas it's impossible to close the
;; time-window of loose permissions otherwise.
(with-file-modes #o0700 (make-directory dir))
(file-already-exists
;; In case it was created earlier with looser rights.
;; We could check the mode info returned by file-attributes, but it's
;; a pain to parse and it may not tell you what we want under
;; non-standard file-systems. So let's just say what we want and let
;; the underlying C code and file-system figure it out.
;; This also ends up checking a bunch of useful conditions: it makes
;; sure we have write-access to the directory and that we own it, thus
;; closing a bunch of security holes.
(condition-case error
(set-file-modes dir #o0700 ')
(file-error
(error
(format "Unable to use temporary directory %s: %s"
dir (mapconcat #'identity (cdr error) " "))))))))
(defun doc-view--current-cache-dir ()
"Return the directory where the png files of the current doc should be saved.
It's a subdirectory of `doc-view-cache-directory'."
(if doc-view--current-cache-dir
doc-view--current-cache-dir
;; Try and make sure doc-view-cache-directory exists and is safe.
(doc-view-make-safe-dir doc-view-cache-directory)
;; Now compute the subdirectory to use.
(setq doc-view--current-cache-dir
(file-name-as-directory
(expand-file-name
(concat (thread-last
(file-name-nondirectory doc-view--buffer-file-name)
;; bug#13679
(subst-char-in-string ?% ?_)
;; arc-mode concatenates archive name and file name
;; with colon, which isn't allowed on MS-Windows.
(subst-char-in-string ?: ?_))
"-"
(let ((file doc-view--buffer-file-name))
(with-temp-buffer
(set-buffer-multibyte nil)
(insert-file-contents-literally file)
(md5 (current-buffer)))))
doc-view-cache-directory)))))
;;;###autoload
(defun doc-view-mode-p (type)
"Return non-nil if document type TYPE is available for `doc-view'.
Document types are symbols like `dvi', `ps', `pdf', `epub',
`cbz', `fb2', `xps', `oxps', or`odf' (any OpenDocument format)."
(and (display-graphic-p)
(image-type-available-p 'png)
(cond
((eq type 'dvi)
(and (doc-view-mode-p 'pdf)
(or (and doc-view-dvipdf-program
(executable-find doc-view-dvipdf-program))
(and doc-view-dvipdfm-program
(executable-find doc-view-dvipdfm-program)))))
((memq type '(postscript ps eps pdf))
(or (and doc-view-ghostscript-program
(executable-find doc-view-ghostscript-program))
;; for pdf also check for `doc-view-pdfdraw-program'
(when (eq type 'pdf)
(and doc-view-pdfdraw-program
(executable-find doc-view-pdfdraw-program)))))
((eq type 'odf)
(and doc-view-odf->pdf-converter-program
(executable-find doc-view-odf->pdf-converter-program)
(doc-view-mode-p 'pdf)))
((eq type 'djvu)
(executable-find "ddjvu"))
((memq type '(epub cbz fb2 xps oxps))
;; first check if `doc-view-pdfdraw-program' is set to mutool
(and (string= doc-view-pdfdraw-program "mutool")
(executable-find "mutool")))
(t ;; unknown image type
nil))))
;;;; Conversion Functions
(defvar doc-view-shrink-factor 1.125)
(defun doc-view-enlarge (factor)
"Enlarge the document by FACTOR."
(interactive (list doc-view-shrink-factor))
(if doc-view-scale-internally
(let ((new (ceiling (* factor doc-view-image-width))))
(unless (equal new doc-view-image-width)
(setq-local doc-view-image-width new)
(doc-view-insert-image
(plist-get (cdr (doc-view-current-image)) :file)
:width doc-view-image-width)))
(let ((new (ceiling (* factor doc-view-resolution))))
(unless (equal new doc-view-resolution)
(setq-local doc-view-resolution new)
(doc-view-reconvert-doc)))))
(defun doc-view-shrink (factor)
"Shrink the document by FACTOR."
(interactive (list doc-view-shrink-factor))
(doc-view-enlarge (/ 1.0 factor)))
(defun doc-view-scale-reset ()
"Reset the document size/zoom level to the initial one."
(interactive)
(if doc-view-scale-internally
(progn
(kill-local-variable 'doc-view-image-width)
(doc-view-insert-image
(plist-get (cdr (doc-view-current-image)) :file)
:width doc-view-image-width))
(kill-local-variable 'doc-view-resolution)
(doc-view-reconvert-doc)))
(defun doc-view-scale-adjust (factor)
"Adjust the scale of the DocView page images by FACTOR.
FACTOR defaults to `doc-view-shrink-factor'.
The actual adjustment made depends on the final component of the
keybinding used to invoke the command, with all modifiers removed:
+, = Increase the image scale by FACTOR
- Decrease the image scale by FACTOR
0 Reset the image scale to the initial scale"
(interactive (list doc-view-shrink-factor))
(let ((ev last-command-event)
(echo-keystrokes nil))
(pcase (event-basic-type ev)
((or ?+ ?=) (doc-view-enlarge factor))
(?- (doc-view-shrink factor))
(?0 (doc-view-scale-reset)))))
(defun doc-view-fit-width-to-window ()
"Fit the image width to the window width."
(interactive)
(let ((win-width (- (nth 2 (window-inside-pixel-edges))
(nth 0 (window-inside-pixel-edges))))
(slice (doc-view-current-slice)))
(if (not slice)
(let ((img-width (car (image-display-size
(image-get-display-property) t))))
(doc-view-enlarge (/ (float win-width) (float img-width))))
;; If slice is set
(let* ((slice-width (nth 2 slice))
(scale-factor (/ (float win-width) (float slice-width)))
(new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
(doc-view-enlarge scale-factor)
(setf (doc-view-current-slice) new-slice)
(doc-view-goto-page (doc-view-current-page))))))
(defun doc-view-fit-height-to-window ()
"Fit the image height to the window height."
(interactive)
(let ((win-height (- (nth 3 (window-inside-pixel-edges))
(nth 1 (window-inside-pixel-edges))))
(slice (doc-view-current-slice)))
(if (not slice)
(let ((img-height (cdr (image-display-size
(image-get-display-property) t))))
;; When users call 'doc-view-fit-height-to-window',
;; they might want to go to next page by typing SPC
;; ONLY once. So I used '(- win-height 1)' instead of
;; 'win-height'
(doc-view-enlarge (/ (float (- win-height 1)) (float img-height))))
;; If slice is set
(let* ((slice-height (nth 3 slice))
(scale-factor (/ (float (- win-height 1)) (float slice-height)))
(new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
(doc-view-enlarge scale-factor)
(setf (doc-view-current-slice) new-slice)
(doc-view-goto-page (doc-view-current-page))))))
(defun doc-view-fit-page-to-window ()
"Fit the image to the window.
More specifically, this function enlarges image by:
min {(window-width / image-width), (window-height / image-height)} times."
(interactive)
(let ((win-width (- (nth 2 (window-inside-pixel-edges))
(nth 0 (window-inside-pixel-edges))))
(win-height (- (nth 3 (window-inside-pixel-edges))
(nth 1 (window-inside-pixel-edges))))
(slice (doc-view-current-slice)))
(if (not slice)
(let ((img-width (car (image-display-size
(image-get-display-property) t)))
(img-height (cdr (image-display-size
(image-get-display-property) t))))
(doc-view-enlarge (min (/ (float win-width) (float img-width))
(/ (float (- win-height 1))
(float img-height)))))
;; If slice is set
(let* ((slice-width (nth 2 slice))
(slice-height (nth 3 slice))
(scale-factor (min (/ (float win-width) (float slice-width))
(/ (float (- win-height 1))
(float slice-height))))
(new-slice (mapcar (lambda (x) (ceiling (* scale-factor x))) slice)))
(doc-view-enlarge scale-factor)