;;; ol-w3m.el --- Copy and Paste From W3M -*- lexical-binding: t; -*-
;; Copyright (C) 2008-2023 Free Software Foundation, Inc.
;; Author: Andy Stewart <lazycat dot manatee at gmail dot com>
;; Keywords: outlines, hypermedia, calendar, wp
;; URL: 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 copying HTML content from a w3m buffer and
;; transforming the text on the fly so that it can be pasted into an
;; Org buffer with hot links. It will also work for regions in gnus
;; buffers that have been washed with w3m.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Acknowledgments:
;; Richard Riley <rileyrgdev at googlemail dot com>
;;
;; The idea of transforming the HTML content with Org syntax is
;; proposed by Richard, I'm just coding it.
;;
;;; Code:
(require 'org-macs)
(org-assert-version)
(require 'ol)
(defvar w3m-current-url)
(defvar w3m-current-title)
(org-link-set-parameters "w3m" :store #'org-w3m-store-link)
(defun org-w3m-store-link ()
"Store a link to a w3m buffer."
(when (eq major-mode 'w3m-mode)
(org-link-store-props
:type "w3m"
:link w3m-current-url
:url (url-view-url t)
:description (or w3m-current-title w3m-current-url))))
(defun org-w3m-copy-for-org-mode ()
"Copy current buffer content or active region with Org style links.
This will encode `link-title' and `link-location' with
`org-link-make-string', and insert the transformed test into the kill ring,
so that it can be yanked into an Org buffer with links working correctly."
(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.
(deactivate-mark))
(message "Transforming links...")
(save-excursion
(goto-char transform-start)
(while (and (not out-bound) ; still inside region to copy
(not (org-w3m-no-next-link-p))) ; no next link current buffer
;; store current point before jump next anchor
(setq temp-position (point))
;; move to next anchor when current point is not at anchor
(or (get-text-property (point) 'w3m-href-anchor) (org-w3m-get-next-link-start))
(cond
((<= (point) transform-end) ; point is inside transform bound
;; get content between two links.
(when (> (point) temp-position)
(setq return-content (concat return-content
(buffer-substring
temp-position (point)))))
(cond
((setq link-location (get-text-property (point) 'w3m-href-anchor))
;; current point is a link
;; (we thus also got link location at current point)
;; get link title at current point.
(setq link-title (buffer-substring (point)
(org-w3m-get-anchor-end)))
;; concat Org style url to `return-content'.
(setq return-content
(concat return-content
(if (org-string-nw-p link-location)
(org-link-make-string link-location link-title)
link-title))))
((setq link-location (get-text-property (point) 'w3m-image))
;; current point is an image
;; (we thus also got image link location at current point)
;; get link title at current point.
(setq link-title (buffer-substring (point) (org-w3m-get-image-end)))
;; concat Org style url to `return-content'.
(setq return-content
(concat return-content
(if (org-string-nw-p link-location)
(org-link-make-string link-location link-title)
link-title))))
(t nil))); current point is neither a link nor an image
(t ; point is NOT inside transform bound
(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))))
(org-kill-new return-content)
(message "Transforming links...done, use C-y to insert text into Org file")
(message "Copy with link transformation complete."))))
(defun org-w3m-get-anchor-start ()
"Move cursor to the start of current anchor. Return point."
;; get start position of anchor or current point
;; NOTE: This function seems never to be used. Should it be removed?
(goto-char (or (previous-single-property-change (point) 'w3m-anchor-sequence)
(point))))
(defun org-w3m-get-anchor-end ()
"Move cursor to the end of current anchor. Return point."
;; get end position of anchor or point
(goto-char (or (next-single-property-change (point) 'w3m-anchor-sequence)
(point))))
(defun org-w3m-get-image-end ()
"Move cursor to the end of current image. Return point."
;; get end position of image or point
;; NOTE: Function `org-w3m-get-image-start' was not created because
;; function `org-w3m-get-anchor-start' is never used.
(goto-char (or (next-single-property-change (point) 'w3m-image)
(point))))
(defun org-w3m-get-next-link-start ()
"Move cursor to the start of next link or image. Return point."
(let (pos start-pos anchor-pos image-pos)
(setq pos (setq start-pos (point)))
(setq anchor-pos
(catch 'reach
(while (setq pos (next-single-property-change pos 'w3m-anchor-sequence))
(when (get-text-property pos 'w3m-href-anchor)
(throw 'reach pos)))))
(setq pos start-pos)
(setq image-pos
(catch 'reach
(while (setq pos (next-single-property-change pos 'w3m-image))
(when (get-text-property pos 'w3m-image)
(throw 'reach pos)))))
(goto-char (min (or anchor-pos (point-max)) (or image-pos (point-max))))))
(defun org-w3m-get-prev-link-start ()
"Move cursor to the start of previous link. Return point."
;; NOTE: This function is only called by `org-w3m-no-prev-link-p',
;; which itself seems never to be used. Should it be removed?
;;
;; WARNING: This function has not been updated to account for
;; `w3m-image'. See `org-w3m-get-next-link-start'.
(catch 'reach
(let ((pos (point)))
(while (setq pos (previous-single-property-change pos 'w3m-anchor-sequence))
(when (get-text-property pos 'w3m-href-anchor)
;; jump to previous anchor
(goto-char pos)
;; return point when current is valid link
(throw 'reach nil)))))
(point))
(defun org-w3m-no-next-link-p ()
"Whether there is no next link after the cursor.
Return t if there is no next link; otherwise, return nil."
(save-excursion
(equal (point) (org-w3m-get-next-link-start))))
(defun org-w3m-no-prev-link-p ()
"Whether there is no previous link after the cursor.
Return t if there is no previous link; otherwise, return nil."
;; NOTE: This function seems never to be used. Should it be removed?
(save-excursion
(equal (point) (org-w3m-get-prev-link-start))))
;; Install keys into the w3m keymap
(defvar w3m-mode-map)
(defvar w3m-minor-mode-map)
(when (and (boundp 'w3m-mode-map)
(keymapp w3m-mode-map))
(define-key w3m-mode-map "\C-c\C-x\M-w" 'org-w3m-copy-for-org-mode)
(define-key w3m-mode-map "\C-c\C-x\C-w" 'org-w3m-copy-for-org-mode))
(when (and (boundp 'w3m-minor-mode-map)
(keymapp w3m-minor-mode-map))
(define-key w3m-minor-mode-map "\C-c\C-x\M-w" 'org-w3m-copy-for-org-mode)
(define-key w3m-minor-mode-map "\C-c\C-x\C-w" 'org-w3m-copy-for-org-mode))
(add-hook
'w3m-mode-hook
(lambda ()
(define-key w3m-mode-map "\C-c\C-x\M-w" 'org-w3m-copy-for-org-mode)
(define-key w3m-mode-map "\C-c\C-x\C-w" 'org-w3m-copy-for-org-mode)))
(add-hook
'w3m-minor-mode-hook
(lambda ()
(define-key w3m-minor-mode-map "\C-c\C-x\M-w" 'org-w3m-copy-for-org-mode)
(define-key w3m-minor-mode-map "\C-c\C-x\C-w" 'org-w3m-copy-for-org-mode)))
(provide 'ol-w3m)
;;; ol-w3m.el ends here