Definitely /not/ including elpa/, that would be chaos.

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-;;; pdf-links.el --- Handle PDF links. -*- lexical-binding: t -*-
-
-;; Copyright (C) 2013, 2014  Andreas Politz
-
-;; Author: Andreas Politz <politza@fh-trier.de>
-;; Keywords: files, multimedia
-
-;; This program 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.
-
-;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-
-(require 'pdf-info)
-(require 'pdf-util)
-(require 'pdf-misc)
-(require 'pdf-cache)
-(require 'pdf-isearch)
-(require 'let-alist)
-(require 'org)
-
-;;; Code:
-
-
-
-;; * ================================================================== *
-;; * Customizations
-;; * ================================================================== *
-
-(defgroup pdf-links nil
-  "Following links in PDF documents."
-  :group 'pdf-tools)
-
-(defface pdf-links-read-link
-  '((((background dark)) (:background "red" :foreground "yellow"))
-    (((background light)) (:background "red" :foreground "yellow")))
-  "Face used to determine the colors when reading links."
-  ;; :group 'pdf-links
-  :group 'pdf-tools-faces)
-
-(defcustom pdf-links-read-link-convert-commands
-  '(;;"-font" "FreeMono"
-    "-pointsize" "%P"
-    "-undercolor" "%f"
-    "-fill" "%b"
-    "-draw" "text %X,%Y '%c'")
-
-  "The commands for the convert program, when decorating links for reading.
-See `pdf-util-convert' for an explanation of the format.
-
-Aside from the description there, two additional escape chars are
-available.
-
-%P -- The scaled font pointsize, i.e. IMAGE-WIDTH * SCALE (See
- `pdf-links-convert-pointsize-scale').
-%c -- String describing the current link key (e.g. AA, AB,
- etc.)."
-  :group 'pdf-links
-  :type '(repeat string)
-  :link '(variable-link pdf-isearch-convert-commands)
-  :link '(url-link "http://www.imagemagick.org/script/convert.php"))
-
-(defcustom pdf-links-convert-pointsize-scale 0.01
-  "The scale factor for the -pointsize convert command.
-
-This determines the relative size of the font, when interactively
-reading links."
-  :group 'pdf-links
-  :type '(restricted-sexp :match-alternatives
-                          ((lambda (x) (and (numberp x)
-                                            (<= x 1)
-                                            (>= x 0))))))
-
-(defcustom pdf-links-browse-uri-function
-  'pdf-links-browse-uri-default
-  "The function for handling uri links.
-
-This function should accept one argument, the URI to follow, and
-do something with it."
-  :group 'pdf-links
-  :type 'function)
-
-
-;; * ================================================================== *
-;; * Minor Mode
-;; * ================================================================== *
-
-(defvar pdf-links-minor-mode-map
-  (let ((kmap (make-sparse-keymap)))
-    (define-key kmap (kbd "f") 'pdf-links-isearch-link)
-    (define-key kmap (kbd "F") 'pdf-links-action-perform)
-    kmap))
-
-;;;###autoload
-(define-minor-mode pdf-links-minor-mode
-  "Handle links in PDF documents.\\<pdf-links-minor-mode-map>
-
-If this mode is enabled, most links in the document may be
-activated by clicking on them or by pressing \\[pdf-links-action-perform] and selecting
-one of the displayed keys, or by using isearch limited to
-links via \\[pdf-links-isearch-link].
-
-\\{pdf-links-minor-mode-map}"
-
-  nil nil nil
-  :group 'pdf-links
-  (pdf-util-assert-pdf-buffer)
-  (cond
-   (pdf-links-minor-mode
-    (pdf-view-add-hotspot-function 'pdf-links-hotspots-function 0))
-   (t
-    (pdf-view-remove-hotspot-function 'pdf-links-hotspots-function)))
-  (pdf-view-redisplay t))
-
-(defun pdf-links-hotspots-function (page size)
-  "Create hotspots for links on PAGE using SIZE."
-
-  (let ((links (pdf-cache-pagelinks page))
-        (id-fmt "link-%d-%d")
-        (i 0)
-        (pointer 'hand)
-        hotspots)
-    (dolist (l links)
-      (let ((e (pdf-util-scale
-                (cdr (assq 'edges l)) size 'round))
-            (id (intern (format id-fmt page
-                                (cl-incf i)))))
-        (push `((rect . ((,(nth 0 e) . ,(nth 1 e))
-                         . (,(nth 2 e) . ,(nth 3 e))))
-                ,id
-                (pointer
-                 ,pointer
-                 help-echo ,(pdf-links-action-to-string l)))
-              hotspots)
-        (local-set-key
-         (vector id 'mouse-1)
-         (lambda nil
-           (interactive "@")
-           (pdf-links-action-perform l)))
-        (local-set-key
-         (vector id t)
-         'pdf-util-image-map-mouse-event-proxy)))
-    (nreverse hotspots)))
-
-(defun pdf-links-action-to-string (link)
-  "Return a string representation of ACTION."
-  (let-alist link
-    (concat
-     (cl-case .type
-       (goto-dest
-        (if (> .page 0)
-            (format "Goto page %d" .page)
-          "Destination not found"))
-       (goto-remote
-        (if (and .filename (file-exists-p .filename))
-            (format "Goto %sfile '%s'"
-                    (if (> .page 0)
-                        (format "p.%d of " .page)
-                      "")
-                    .filename)
-          (format "Link to nonexistent file '%s'" .filename)))
-       (uri
-        (if (> (length .uri) 0)
-            (format "Link to uri '%s'" .uri)
-          (format "Link to empty uri")))
-       (t (format "Unrecognized link type: %s" .type)))
-     (if (> (length .title) 0)
-         (format " (%s)" .title)))))
-
-;;;###autoload
-(defun pdf-links-action-perform (link)
-  "Follow LINK, depending on its type.
-
-This may turn to another page, switch to another PDF buffer or
-invoke `pdf-links-browse-uri-function'.
-
-Interactively, link is read via `pdf-links-read-link-action'.
-This function displays characters around the links in the current
-page and starts reading characters (ignoring case).  After a
-sufficient number of characters have been read, the corresponding
-link's link is invoked.  Additionally, SPC may be used to
-scroll the current page."
-  (interactive
-   (list (or (pdf-links-read-link-action "Activate link (SPC scrolls): ")
-             (error "No link selected"))))
-  (let-alist link
-    (cl-case .type
-      ((goto-dest goto-remote)
-       (let ((window (selected-window)))
-         (cl-case .type
-           (goto-dest
-            (unless (> .page 0)
-              (error "Link points to nowhere")))
-           (goto-remote
-            (unless (and .filename (file-exists-p .filename))
-              (error "Link points to nonexistent file %s" .filename))
-            (setq window (display-buffer
-                          (or (find-buffer-visiting .filename)
-                              (find-file-noselect .filename))))))
-         (with-selected-window window
-           (when (derived-mode-p 'pdf-view-mode)
-             (when (> .page 0)
-               (pdf-view-goto-page .page))
-             (when .top
-               ;; Showing the tooltip delays displaying the page for
-               ;; some reason (sit-for/redisplay don't help), do it
-               ;; later.
-               (run-with-idle-timer 0.001 nil
-                 (lambda ()
-                   (when (window-live-p window)
-                     (with-selected-window window
-                       (when (derived-mode-p 'pdf-view-mode)
-                         (pdf-util-tooltip-arrow .top)))))))))))
-      (uri
-       (funcall pdf-links-browse-uri-function .uri))
-      (t
-       (error "Unrecognized link type: %s" .type)))
-    nil))
-
-(defun pdf-links-read-link-action (prompt)
-  "Using PROMPT, interactively read a link-action.
-
-See `pdf-links-action-perform' for the interface."
-
-  (pdf-util-assert-pdf-window)
-  (let* ((links (pdf-cache-pagelinks
-                 (pdf-view-current-page)))
-         (keys (pdf-links-read-link-action--create-keys
-                (length links)))
-         (key-strings (mapcar (apply-partially 'apply 'string)
-                              keys))
-         (alist (cl-mapcar 'cons keys links))
-         (size (pdf-view-image-size))
-         (colors (pdf-util-face-colors
-                  'pdf-links-read-link pdf-view-dark-minor-mode))
-         (args (list
-                :foreground (car colors)
-                :background (cdr colors)
-                :formats
-                 `((?c . ,(lambda (_edges) (pop key-strings)))
-                   (?P . ,(number-to-string
-                           (max 1 (* (cdr size)
-                                     pdf-links-convert-pointsize-scale)))))
-                 :commands pdf-links-read-link-convert-commands
-                 :apply (pdf-util-scale-relative-to-pixel
-                         (mapcar (lambda (l) (cdr (assq 'edges l)))
-                                 links)))))
-    (unless links
-      (error "No links on this page"))
-    (unwind-protect
-        (let ((image-data
-               (pdf-cache-get-image
-                (pdf-view-current-page)
-                (car size) (car size) 'pdf-links-read-link-action)))
-          (unless image-data
-            (setq image-data (apply 'pdf-util-convert-page args ))
-            (pdf-cache-put-image
-             (pdf-view-current-page)
-             (car size) image-data 'pdf-links-read-link-action))
-          (pdf-view-display-image
-           (create-image image-data (pdf-view-image-type) t))
-          (pdf-links-read-link-action--read-chars prompt alist))
-      (pdf-view-redisplay))))
-
-(defun pdf-links-read-link-action--read-chars (prompt alist)
-  (catch 'done
-    (let (key)
-      (while t
-        (let* ((chars (append (mapcar 'caar alist)
-                              (mapcar 'downcase (mapcar 'caar alist))
-                              (list ?\s)))
-               (ch (read-char-choice prompt chars)))
-          (setq ch (upcase ch))
-          (cond
-           ((= ch ?\s)
-            (when (= (window-vscroll) (image-scroll-up))
-              (image-scroll-down (window-vscroll))))
-           (t
-            (setq alist (delq nil (mapcar (lambda (elt)
-                                            (and (eq ch (caar elt))
-                                                 (cons (cdar elt)
-                                                       (cdr elt))))
-                                          alist))
-                  key (append key (list ch))
-                  prompt (concat prompt (list ch)))
-            (when (= (length alist) 1)
-              (message nil)
-              (throw 'done (cdar alist))))))))))
-
-(defun pdf-links-read-link-action--create-keys (n)
-  (when (> n 0)
-    (let ((len (1+ (floor (log n 26))))
-          keys)
-      (dotimes (i n)
-        (let (key)
-          (dotimes (_x len)
-            (push (+ (% i 26) ?A) key)
-            (setq i (/ i 26)))
-          (push key keys)))
-      (nreverse keys))))
-
-(defun pdf-links-isearch-link ()
-  (interactive)
-  (let* (quit-p
-         (isearch-mode-end-hook
-          (cons (lambda nil
-                  (setq quit-p isearch-mode-end-hook-quit))
-                isearch-mode-end-hook))
-         (pdf-isearch-filter-matches-function
-          'pdf-links-isearch-link-filter-matches)
-         (pdf-isearch-narrow-to-page t)
-         (isearch-message-prefix-add "(Links)")
-         pdf-isearch-batch-mode)
-    (isearch-forward)
-    (unless (or quit-p (null pdf-isearch-current-match))
-      (let* ((page (pdf-view-current-page))
-             (match (car pdf-isearch-current-match))
-             (size (pdf-view-image-size))
-             (links (sort (cl-remove-if
-                           (lambda (e)
-                             (= 0 (pdf-util-edges-intersection-area (car e) match)))
-                           (mapcar (lambda (l)
-                                     (cons (pdf-util-scale (alist-get 'edges l) size)
-                                           l))
-                                   (pdf-cache-pagelinks page)))
-                          (lambda (e1 e2)
-                            (> (pdf-util-edges-intersection-area
-                                (alist-get 'edges e1) match)
-                               (pdf-util-edges-intersection-area
-                                (alist-get 'edges e2) match))))))
-        (unless links
-          (error "No link found at this position"))
-        (pdf-links-action-perform (car links))))))
-
-(defun pdf-links-isearch-link-filter-matches (matches)
-  (let ((links (pdf-util-scale
-                (mapcar (apply-partially 'alist-get 'edges)
-                        (pdf-cache-pagelinks
-                         (pdf-view-current-page)))
-                (pdf-view-image-size))))
-    (cl-remove-if-not
-     (lambda (m)
-       (cl-some
-        (lambda (edges)
-          (cl-some (lambda (link)
-                     (pdf-util-with-edges (link edges)
-                       (let ((area (min (* link-width link-height)
-                                        (* edges-width edges-height))))
-                         (>  (/  (pdf-util-edges-intersection-area edges link)
-                                 (float area)) 0.5))))
-                   links))
-        m))
-     matches)))
-
-(defun pdf-links-browse-uri-default (uri)
-  "Open the string URI using Org.
-
-Wraps the URI in \[\[ ... \]\] and calls `org-open-link-from-string'
-on the resulting string."
-  (cl-check-type uri string)
-  (message "Opening `%s' with Org" uri)
-  (org-open-link-from-string (format "[[%s]]" uri)))
-
-(provide 'pdf-links)
-
-;;; pdf-links.el ends here