org-mode/contrib/lisp/org-download.el

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