;;; org-docview.el --- Support for links to doc-view-mode buffers -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2018 Free Software Foundation, Inc.
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;; Author: Jan Böcker <jan.boecker at jboecker dot de>
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;; Keywords: outlines, hypermedia, calendar, wp
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;; Homepage: https://orgmode.org
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;;
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;; This file is part of GNU Emacs.
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;;
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;
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;;; Commentary:
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;; This file implements links to open files in doc-view-mode.
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;; Org mode loads this module by default - if this is not what you want,
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;; configure the variable `org-modules'.
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;; The links take the form
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;;
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;; docview:<file path>::<page number>
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;;
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;; for example: [[docview:~/.elisp/org/doc/org.pdf::1][Org-Mode Manual]]
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;;
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;; Autocompletion for inserting links is supported; you will be
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;; prompted for a file and a page number.
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;;
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;; If you use org-store-link in a doc-view mode buffer, the stored
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;; link will point to the current page.
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;;; Code:
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(require 'org)
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(require 'doc-view)
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(declare-function doc-view-goto-page "doc-view" (page))
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(declare-function image-mode-window-get "image-mode" (prop &optional winprops))
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(org-link-set-parameters "docview"
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:follow #'org-docview-open
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:export #'org-docview-export
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:store #'org-docview-store-link)
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(defun org-docview-export (link description format)
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"Export a docview link from Org files."
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(let* ((path (if (string-match "\\(.+\\)::.+" link) (match-string 1 link)
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link))
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(desc (or description link)))
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(when (stringp path)
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(setq path (org-link-escape (expand-file-name path)))
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(cond
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((eq format 'html) (format "<a href=\"%s\">%s</a>" path desc))
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((eq format 'latex) (format "\\href{%s}{%s}" path desc))
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((eq format 'ascii) (format "%s (%s)" desc path))
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(t path)))))
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(defun org-docview-open (link)
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(string-match "\\(.*?\\)\\(?:::\\([0-9]+\\)\\)?$" link)
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(let ((path (match-string 1 link))
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(page (and (match-beginning 2)
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(string-to-number (match-string 2 link)))))
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;; Let Org mode open the file (in-emacs = 1) to ensure
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;; org-link-frame-setup is respected.
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(org-open-file path 1)
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(when page (doc-view-goto-page page))))
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(defun org-docview-store-link ()
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"Store a link to a docview buffer."
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(when (eq major-mode 'doc-view-mode)
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;; This buffer is in doc-view-mode
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(let* ((path buffer-file-name)
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(page (image-mode-window-get 'page))
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(link (concat "docview:" path "::" (number-to-string page))))
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(org-store-link-props
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:type "docview"
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:link link
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:description path))))
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(defun org-docview-complete-link ()
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"Use the existing file name completion for file.
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Links to get the file name, then ask the user for the page number
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and append it."
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(concat (replace-regexp-in-string "^file:" "docview:" (org-file-complete-link))
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"::"
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(read-from-minibuffer "Page:" "1")))
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(provide 'org-docview)
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;;; org-docview.el ends here
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