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+;;; ol-docview.el --- Links to Docview mode buffers  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2009-2021 Free Software Foundation, Inc.
+
+;; Author: Jan Böcker <jan.boecker at jboecker dot de>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: https://orgmode.org
+;;
+;; 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/>.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;
+;;; Commentary:
+
+;; This file implements links to open files in doc-view-mode.
+;; Org mode loads this module by default - if this is not what you want,
+;; configure the variable `org-modules'.
+
+;; The links take the form
+;;
+;;    docview:<file path>::<page number>
+;;
+;; for example: [[docview:~/.elisp/org/doc/org.pdf::1][Org-Mode Manual]]
+;;
+;; Autocompletion for inserting links is supported; you will be
+;; prompted for a file and a page number.
+;;
+;; If you use org-store-link in a doc-view mode buffer, the stored
+;; link will point to the current page.
+
+;;; Code:
+
+
+(require 'doc-view)
+(require 'ol)
+
+(declare-function doc-view-goto-page "doc-view" (page))
+(declare-function image-mode-window-get "image-mode" (prop &optional winprops))
+(declare-function org-open-file "org" (path &optional in-emacs line search))
+
+(org-link-set-parameters "docview"
+			 :follow #'org-docview-open
+			 :export #'org-docview-export
+			 :store #'org-docview-store-link)
+
+(defun org-docview-export (link description format)
+  "Export a docview link from Org files."
+  (let ((path (if (string-match "\\(.+\\)::.+" link) (match-string 1 link)
+		link))
+        (desc (or description link)))
+    (when (stringp path)
+      (setq path (expand-file-name path))
+      (cond
+       ((eq format 'html) (format "<a href=\"%s\">%s</a>" path desc))
+       ((eq format 'latex) (format "\\href{%s}{%s}" path desc))
+       ((eq format 'ascii) (format "%s (%s)" desc path))
+       (t path)))))
+
+(defun org-docview-open (link _)
+  (string-match "\\(.*?\\)\\(?:::\\([0-9]+\\)\\)?$" link)
+  (let ((path (match-string 1 link))
+	(page (and (match-beginning 2)
+		   (string-to-number (match-string 2 link)))))
+    ;; Let Org mode open the file (in-emacs = 1) to ensure
+    ;; org-link-frame-setup is respected.
+    (org-open-file path 1)
+    (when page (doc-view-goto-page page))))
+
+(defun org-docview-store-link ()
+  "Store a link to a docview buffer."
+  (when (eq major-mode 'doc-view-mode)
+    ;; This buffer is in doc-view-mode
+    (let* ((path buffer-file-name)
+	   (page (image-mode-window-get 'page))
+	   (link (concat "docview:" path "::" (number-to-string page))))
+      (org-link-store-props
+       :type "docview"
+       :link link
+       :description path))))
+
+(defun org-docview-complete-link ()
+  "Use the existing file name completion for file.
+Links to get the file name, then ask the user for the page number
+and append it."
+  (concat (replace-regexp-in-string "^file:" "docview:" (org-link-complete-file))
+	  "::"
+	  (read-from-minibuffer "Page:" "1")))
+
+(provide 'ol-docview)
+
+;;; ol-docview.el ends here