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+;;; org-download.el --- Image drag-and-drop for Emacs org-mode
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+
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+;; Copyright (C) 2014 Free Software Foundation, Inc.
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+
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+;; Author: Oleh Krehel
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+;; Keywords: images, screenshots, download
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+;; Homepage: http://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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+
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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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+
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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 <http://www.gnu.org/licenses/>.
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+
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+;;; Commentary:
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+;;
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+;; This extension facilitates moving images from point A to point B.
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+;;
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+;; Point A (the source) can be:
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+;; 1. An image inside your browser that you can drag to Emacs.
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+;; 2. An image on your file system that you can drag to Emacs.
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+;; 3. A local or remote image address in kill-ring.
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+;; Use the `org-download-yank' command for this.
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+;; Remember that you can use "0 w" in `dired' to get an address.
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+;; 4. An screenshot taken using `gnome-screenshot' or `scrot' or `gm'.
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+;; Use the `org-download-screenshot' command for this.
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+;; Customize the backend with `org-download-screenshot-method'.
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+;;
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+;; Point B (the target) is an Emacs `org-mode' buffer where the inline
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+;; link will be inserted. Several customization options will determine
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+;; where exactly on the file system the file will be stored.
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+;;
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+;; They are:
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+;; `org-download-method':
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+;; a. 'attach => use `org-mode' attachment machinery
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+;; b. 'directory => construct the directory in two stages:
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+;; 1. first part of the folder name is:
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+;; * either "." (current folder)
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+;; * or `org-download-image-dir' (if it's not nil).
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+;; `org-download-image-dir' becomes buffer-local when set,
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+;; so each file can customize this value, e.g with:
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+;; # -*- mode: Org; org-download-image-dir: ~/Pictures/foo; -*-
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+;; 2. second part is:
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+;; * `org-download-heading-lvl' is nil => ""
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+;; * `org-download-heading-lvl' is n => the name of current
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+;; heading with level n. Level count starts with 0,
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+;; i.e. * is 0, ** is 1, *** is 2 etc.
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+;; `org-download-heading-lvl' becomes buffer-local when set,
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+;; so each file can customize this value, e.g with:
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+;; # -*- mode: Org; org-download-heading-lvl: nil; -*-
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+;;
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+;; `org-download-timestamp':
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+;; optionally add a timestamp to the file name.
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+;;
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+;; Customize `org-download-backend' to choose between `url-retrieve'
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+;; (the default) or `wget' or `curl'.
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+;;
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+;;; Code:
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+
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+
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+(eval-when-compile
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+ (require 'cl))
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+(require 'url-parse)
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+(require 'url-http)
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+
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+(defgroup org-download nil
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+ "Image drag-and-drop for org-mode."
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+ :group 'org
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+ :prefix "org-download-")
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+
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+(defcustom org-download-method 'directory
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+ "The way images should be stored."
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+ :type '(choice
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+ (const :tag "Directory" directory)
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+ (const :tag "Attachment" attach))
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+ :group 'org-download)
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+
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+(defcustom org-download-image-dir nil
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+ "If set, images will be stored in this directory instead of \".\".
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+See `org-download--dir-1' for more info."
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+ :type '(choice
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+ (const :tag "Default" nil)
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+ (string :tag "Directory"))
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+ :group 'org-download)
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+(make-variable-buffer-local 'org-download-image-dir)
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+
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+(defcustom org-download-heading-lvl 0
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+ "Heading level to be used in `org-download--dir-2'."
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+ :group 'org-download)
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+(make-variable-buffer-local 'org-download-heading-lvl)
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+
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+(defcustom org-download-backend t
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+ "Method to use for downloading."
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+ :type '(choice
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+ (const :tag "wget" "wget \"%s\" -O \"%s\"")
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+ (const :tag "curl" "curl \"%s\" -o \"%s\"")
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+ (const :tag "url-retrieve" t))
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+ :group 'org-download)
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+
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+(defcustom org-download-timestamp "_%Y-%m-%d_%H:%M:%S"
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+ "This `format-time-string'-style string will be appended to the file name.
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+Set this to \"\" if you don't want time stamps."
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+ :type 'string
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+ :group 'org-download)
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+
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+(defcustom org-download-screenshot-method "gnome-screenshot -a -f %s"
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+ "The tool to capture screenshots."
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+ :type '(choice
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+ (const :tag "gnome-screenshot" "gnome-screenshot -a -f %s")
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+ (const :tag "scrot" "scrot -s %s")
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+ (const :tag "gm" "gm import %s"))
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+ :group 'org-download)
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+
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+(defcustom org-download-image-width 0
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+ "When non-zero add #+attr_html: :width tag to the image."
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+ :type 'integer
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+ :group 'org-download)
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+
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+(defun org-download-get-heading (lvl)
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+ "Return the heading of the current entry's LVL level parent."
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+ (save-excursion
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+ (let ((cur-lvl (org-current-level)))
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+ (unless (= cur-lvl 1)
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+ (org-up-heading-all (- (1- (org-current-level)) lvl)))
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+ (substring-no-properties
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+ (org-get-heading)))))
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+
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+(defun org-download--dir-1 ()
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+ "Return the first part of the directory path for `org-download--dir'.
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+It's `org-download-image-dir', unless it's nil. Then it's \".\"."
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+ (or org-download-image-dir "."))
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+
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+(defun org-download--dir-2 ()
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+ "Return the second part of the directory path for `org-download--dir'.
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+Unless `org-download-heading-lvl' is nil, it's the name of the current
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+`org-download-heading-lvl'-leveled heading. Otherwise it's \"\"."
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+ (and org-download-heading-lvl
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+ (org-download-get-heading
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+ org-download-heading-lvl)))
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+
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+(defun org-download--dir ()
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+ "Return the directory path for image storage.
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+
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+The path is composed from `org-download--dir-1' and `org-download--dir-2'.
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+The directory is created if it didn't exist before."
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+ (let* ((part1 (org-download--dir-1))
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+ (part2 (org-download--dir-2))
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+ (dir (if part2
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+ (format "%s/%s" part1 part2)
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+ part1)))
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+ (unless (file-exists-p dir)
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+ (make-directory dir t))
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+ dir))
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+
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+(defun org-download--fullname (link)
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+ "Return the file name where LINK will be saved to.
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+
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+It's affected by `org-download-timestamp' and `org-download--dir'."
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+ (let ((filename
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+ (file-name-nondirectory
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+ (car (url-path-and-query
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+ (url-generic-parse-url link)))))
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+ (dir (org-download--dir)))
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+ (format "%s/%s%s.%s"
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+ dir
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+ (file-name-sans-extension filename)
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+ (format-time-string org-download-timestamp)
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+ (file-name-extension filename))))
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+
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+(defun org-download--image (link filename)
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+ "Save LINK to FILENAME asynchronously and show inline images in current buffer."
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+ (when (string-match "^file://\\(.*\\)" link)
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+ (setq link (url-unhex-string (match-string 1 link))))
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+ (cond ((file-exists-p link)
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+ (org-download--image/command "cp \"%s\" \"%s\"" link filename))
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+ ((eq org-download-backend t)
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+ (org-download--image/url-retrieve link filename))
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+ (t
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+ (org-download--image/command org-download-backend link filename))))
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+
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+(defun org-download--image/command (command link filename)
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+ "Using COMMAND, save LINK to FILENAME.
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+COMMAND is a format-style string with two slots for LINK and FILENAME."
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+ (require 'async)
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+ (async-start
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+ `(lambda() (shell-command
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+ ,(format command link
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+ (expand-file-name filename))))
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+ (lexical-let ((cur-buf (current-buffer)))
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+ (lambda(x)
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+ (with-current-buffer cur-buf
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+ (org-display-inline-images))))))
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+
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+(defun org-download--image/url-retrieve (link filename)
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+ "Save LINK to FILENAME using `url-retrieve'."
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+ (url-retrieve
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+ link
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+ (lambda (status filename buffer)
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+ ;; Write current buffer to FILENAME
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+ ;; and update inline images in BUFFER
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+ (let ((err (plist-get status :error)))
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+ (if err (error
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+ "\"%s\" %s" link
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+ (downcase (nth 2 (assq (nth 2 err) url-http-codes))))))
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+ (delete-region
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+ (point-min)
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+ (progn
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+ (re-search-forward "\n\n" nil 'move)
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+ (point)))
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+ (let ((coding-system-for-write 'no-conversion))
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+ (write-region nil nil filename nil nil nil 'confirm))
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+ (with-current-buffer buffer
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+ (org-display-inline-images)))
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+ (list
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+ (expand-file-name filename)
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+ (current-buffer))
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+ nil t))
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+
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+(defun org-download-yank ()
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+ "Call `org-download-image' with current kill."
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+ (interactive)
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+ (org-download-image (current-kill 0)))
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+
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+(defun org-download-screenshot ()
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+ "Capture screenshot and insert the resulting file.
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+The screenshot tool is determined by `org-download-screenshot-method'."
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+ (interactive)
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+ (let ((link "/tmp/screenshot.png"))
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+ (shell-command (format org-download-screenshot-method link))
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+ (org-download-image link)))
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+
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+(defun org-download-image (link)
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+ "Save image at address LINK to `org-download--dir'."
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+ (interactive "sUrl: ")
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+ (let ((filename
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+ (if (eq org-download-method 'attach)
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+ (let ((org-download-image-dir (progn (require 'org-attach)
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+ (org-attach-dir t)))
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+ org-download-heading-lvl)
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+ (org-download--fullname link))
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+ (org-download--fullname link))))
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+ (when (image-type-from-file-name filename)
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+ (org-download--image link filename)
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+ (when (eq org-download-method 'attach)
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+ (org-attach-attach filename nil 'none))
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+ (if (looking-back "^[ \t]+")
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+ (delete-region (match-beginning 0) (match-end 0))
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+ (newline))
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+ (insert (format "#+DOWNLOADED: %s @ %s\n%s [[%s]]"
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+ link
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+ (format-time-string "%Y-%m-%d %H:%M:%S")
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+ (if (= org-download-image-width 0)
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+ ""
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+ (format "#+attr_html: :width %dpx\n" org-download-image-width))
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+ filename))
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+ (org-display-inline-images))))
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+
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+(defun org-download--at-comment-p ()
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+ "Check if current line begins with #+DOWLOADED:."
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+ (save-excursion
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+ (move-beginning-of-line nil)
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+ (looking-at "#\\+DOWNLOADED:")))
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+
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+(defun org-download-delete ()
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+ "Delete inline image link on current line, and the file that it points to."
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+ (interactive)
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+ (cond ((org-download--at-comment-p)
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+ (delete-region (line-beginning-position)
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+ (line-end-position))
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+ (org-download--delete (line-beginning-position)
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+ nil
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+ 1))
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+ ((region-active-p)
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+ (org-download--delete (region-beginning)
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+ (region-end))
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+ (delete-region (region-beginning)
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+ (region-end)))
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+
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+ (t (org-download--delete (line-beginning-position)
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+ (line-end-position)))))
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+
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+(defun org-download--delete (beg end &optional times)
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+ "Delete inline image links and the files they point to between BEG and END.
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+
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+When TIMES isn't nil, delete only TIMES links."
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+ (unless times
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+ (setq times most-positive-fixnum))
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+ (save-excursion
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+ (goto-char beg)
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+ (while (and (>= (decf times) 0)
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+ (re-search-forward "\\[\\[\\([^]]*\\)\\]\\]" end t))
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+ (let ((str (match-string-no-properties 1)))
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+ (delete-region (match-beginning 0)
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+ (match-end 0))
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+ (when (file-exists-p str)
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+ (delete-file str))))))
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+
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+(defun org-download-dnd (uri action)
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+ "When in `org-mode' and URI points to image, download it.
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+Otherwise, pass URI and ACTION back to dnd dispatch."
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+ (if (eq major-mode 'org-mode)
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+ ;; probably shouldn't redirect
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+ (unless (org-download-image uri)
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+ (message "not an image URL"))
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+ ;; redirect to someone else
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+ (let ((dnd-protocol-alist
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+ (rassq-delete-all
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+ 'org-download-dnd
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+ (copy-alist dnd-protocol-alist))))
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+ (dnd-handle-one-url nil action uri))))
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+
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+(defun org-download-enable ()
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+ "Enable org-download."
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+ (unless (eq (cdr (assoc "^\\(https?\\|ftp\\|file\\|nfs\\)://" dnd-protocol-alist))
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+ 'org-download-dnd)
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+ (setq dnd-protocol-alist
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+ `(("^\\(https?\\|ftp\\|file\\|nfs\\)://" . org-download-dnd) ,@dnd-protocol-alist))))
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+
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+(defun org-download-disable ()
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+ "Disable org-download."
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+ (rassq-delete-all 'org-download-dnd dnd-protocol-alist))
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+
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+(org-download-enable)
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+
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+(provide 'org-download)
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+
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+;;; org-download.el ends here
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Oleh Krehel