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;;; org-eww.el --- Store url and kill from Eww mode for Org -*- lexical-binding: t -*-
;; Copyright (C) 2014-2017 Free Software Foundation, Inc.
;; Author: Marco Wahl <marcowahlsoft>a<gmailcom>
;; Keywords: link, eww
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; When this module is active `org-store-link' (often on key C-c l) in
;; a eww buffer stores a link to the current url of the eww buffer.
;; In an eww buffer function `org-eww-copy-for-org-mode' kills either
;; a region or the whole buffer if no region is set and transforms the
;; text on the fly so that it can be pasted into an Org buffer with
;; hot links.
;; C-c C-x C-w (and also C-c C-x M-w) trigger
;; `org-eww-copy-for-org-mode'.
;; Hint: A lot of code of this module comes from module org-w3m which
;; has been written by Andy Steward based on the idea of Richard
;; Riley. Thanks!
;; Potential: Since the code for w3m and eww is so similar one could
;; try to refactor.
;;; Code:
(require 'org)
(require 'cl-lib)
(defvar eww-current-title)
(defvar eww-current-url)
(defvar eww-data)
(defvar eww-mode-map)
(declare-function eww-current-url "eww")
;; Store Org-link in eww-mode buffer
(org-link-set-parameters "eww" :follow #'eww :store #'org-eww-store-link)
(defun org-eww-store-link ()
"Store a link to the url of a Eww buffer."
(when (eq major-mode 'eww-mode)
(org-store-link-props
:type "eww"
:link (if (< emacs-major-version 25)
eww-current-url
(eww-current-url))
:url (url-view-url t)
:description (if (< emacs-major-version 25)
(or eww-current-title eww-current-url)
(or (plist-get eww-data :title)
(eww-current-url))))))
;; Some auxiliary functions concerning links in eww buffers
(defun org-eww-goto-next-url-property-change ()
"Move to the start of next link if exists.
Otherwise point is not moved. Return point."
(goto-char
(or (next-single-property-change (point) 'shr-url)
(point))))
(defun org-eww-has-further-url-property-change-p ()
"Non-nil if there is a next url property change."
(save-excursion
(not (eq (point) (org-eww-goto-next-url-property-change)))))
(defun org-eww-url-below-point ()
"Return the url below point if there is an url; otherwise, return nil."
(get-text-property (point) 'shr-url))
(defun org-eww-copy-for-org-mode ()
"Copy current buffer content or active region with `org-mode' style links.
This will encode `link-title' and `link-location' with
`org-make-link-string', and insert the transformed test into the kill ring,
so that it can be yanked into an Org mode buffer with links working correctly.
Further lines starting with a star get quoted with a comma to keep
the structure of the Org file."
(interactive)
(let* ((regionp (org-region-active-p))
(transform-start (point-min))
(transform-end (point-max))
return-content
link-location link-title
temp-position out-bound)
(when regionp
(setq transform-start (region-beginning))
(setq transform-end (region-end))
;; Deactivate mark if current mark is activate.
(when (fboundp 'deactivate-mark) (deactivate-mark)))
(message "Transforming links...")
(save-excursion
(goto-char transform-start)
(while (and (not out-bound) ; still inside region to copy
(org-eww-has-further-url-property-change-p)) ; there is a next link
;; Store current point before jump next anchor.
(setq temp-position (point))
;; Move to next anchor when current point is not at anchor.
(or (org-eww-url-below-point)
(org-eww-goto-next-url-property-change))
(cl-assert
(org-eww-url-below-point) t
"program logic error: point must have an url below but it hasn't")
(if (<= (point) transform-end) ; if point is inside transform bound
(progn
;; Get content between two links.
(when (< temp-position (point))
(setq return-content (concat return-content
(buffer-substring
temp-position (point)))))
;; Get link location at current point.
(setq link-location (org-eww-url-below-point))
;; Get link title at current point.
(setq link-title
(buffer-substring
(point)
(org-eww-goto-next-url-property-change)))
;; concat `org-mode' style url to `return-content'.
(setq return-content
(concat return-content
(if (stringp link-location)
;; hint: link-location is different for form-elements.
(org-make-link-string link-location link-title)
link-title))))
(goto-char temp-position) ; reset point before jump next anchor
(setq out-bound t) ; for break out `while' loop
))
;; Add the rest until end of the region to be copied.
(when (< (point) transform-end)
(setq return-content
(concat return-content
(buffer-substring (point) transform-end))))
;; Quote lines starting with *.
(org-kill-new (replace-regexp-in-string "^\\*" ",*" return-content))
(message "Transforming links...done, use C-y to insert text into Org mode file"))))
;; Additional keys for eww-mode
(defun org-eww-extend-eww-keymap ()
(define-key eww-mode-map "\C-c\C-x\M-w" 'org-eww-copy-for-org-mode)
(define-key eww-mode-map "\C-c\C-x\C-w" 'org-eww-copy-for-org-mode))
(when (and (boundp 'eww-mode-map)
(keymapp eww-mode-map)) ; eww is already up.
(org-eww-extend-eww-keymap))
(add-hook 'eww-mode-hook #'org-eww-extend-eww-keymap)
(provide 'org-eww)
;;; org-eww.el ends here
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