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shrface.el
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shrface.el
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;;; shrface.el --- Org-like Faces for shr -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Damon Chan
;; Author: Damon Chan
;; URL: https://github.com/chenyanming/shrface
;; Keywords: shr face
;; Version: 1.1
;; 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/>.
;;; Code:
(require 'shr)
(require 'org-faces)
(require 'org-bullets)
;;; shrface
(defgroup shrface nil
"Org-like faces setting for shr"
:group 'shr)
(defgroup shrface-faces nil
"Org-like faces for shr"
:group 'shrface
:group 'faces)
(defcustom shrface-bullets-bullet-list org-bullets-bullet-list
"Bullets for headings"
:group 'shrface
:type '(repeat (string :tag "Bullet character")))
(defcustom shrface-paragraph-indentation 2
"Indentation for paragraph"
:group 'shrface
:type 'integer)
(defcustom shrface-paragraph-fill-column 120
"Fill columns for paragraph"
:group 'shrface
:type 'integer)
(defvar shrface-href-face 'shrface-href-face
"Face name to use for href.")
(defface shrface-href-face '((t :inherit org-link))
"Face used for href"
:group 'shrface-faces)
(defface shrface-h1-face '((t :inherit org-level-1))
"Face used for h1 headlines."
:group 'shrface-faces)
(defface shrface-h2-face '((t :inherit org-level-2))
"Face used for h2 headlines."
:group 'shrface-faces)
(defface shrface-h3-face '((t :inherit org-level-3))
"Face used for h3 headlines."
:group 'shrface-faces)
(defface shrface-h4-face '((t :inherit org-level-4))
"Face used for h4 headlines."
:group 'shrface-faces)
(defface shrface-h5-face '((t :inherit org-level-5))
"Face used for h5 headlines."
:group 'shrface-faces)
(defface shrface-h6-face '((t :inherit org-level-6))
"Face used for h6 headlines."
:group 'shrface-faces)
(defface shrface-highlight
'(
(((class color) (min-colors 88) (background light))
:background "darkseagreen2")
(((class color) (min-colors 88) (background dark))
:background "darkolivegreen")
(((class color) (min-colors 16) (background light))
:background "darkseagreen2")
(((class color) (min-colors 16) (background dark))
:background "darkolivegreen")
(((class color) (min-colors 8))
:background "green" :foreground "black")
(t :inverse-video t)
)
"Face for highlighting."
:group 'shrface-faces)
;;; Utility
;;;###autoload
(defun shrface-shr-fontize-dom (dom &rest types)
(let ((start (point))) ;; remember start of inserted region
(shr-generic dom) ;; inserts the contents of the tag
(dolist (type types)
(shrface-shr-add-font start (point) type)) ;; puts text properties of TYPES on the inserted contents
))
;;;###autoload
(defun shrface-shr-add-font (start end type)
(save-excursion
(goto-char start)
(while (< (point) end)
(when (bolp)
(skip-chars-forward " "))
(add-text-properties (point) (min (line-end-position) end) type)
(if (< (line-end-position) end)
(forward-line 1)
(goto-char end)))))
;;;###autoload
(defun shrface-shr-urlify (start url &optional title)
(shr-add-font start (point) 'shr-link)
(add-text-properties
start (point)
(list 'shr-url url
'help-echo (let ((iri (or (ignore-errors
(decode-coding-string
(url-unhex-string url)
'utf-8 t))
url)))
(if title (format "%s (%s)" iri title) iri))
'follow-link t
'face shrface-href-face
'mouse-face 'highlight))
(while (and start
(< start (point)))
(let ((next (next-single-property-change start 'keymap nil (point))))
(if (get-text-property start 'keymap)
(setq start next)
(put-text-property start (or next (point)) 'keymap shr-map)))))
(defun shrface-tag-h1 (dom)
(shrface-shr-h1 dom '(comment t face shrface-h1-face)))
(defun shrface-tag-h2 (dom)
(shrface-shr-h2 dom '(comment t face shrface-h2-face)))
(defun shrface-tag-h3 (dom)
(shrface-shr-h3 dom '(comment t face shrface-h3-face)))
(defun shrface-tag-h4 (dom)
(shrface-shr-h4 dom '(comment t face shrface-h4-face)))
(defun shrface-tag-h5 (dom)
(shrface-shr-h5 dom '(comment t face shrface-h5-face)))
(defun shrface-tag-h6 (dom)
(shrface-shr-h6 dom '(comment t face shrface-h6-face)))
(defun shrface-shr-h1 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 0 shrface-bullets-bullet-list) " ") 'face 'shrface-h1-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-shr-h2 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 1 shrface-bullets-bullet-list) " ") 'face 'shrface-h2-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-shr-h3 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 2 shrface-bullets-bullet-list) " ") 'face 'shrface-h3-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-shr-h4 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 3 shrface-bullets-bullet-list) " ") 'face 'shrface-h4-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-shr-h5 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 4 shrface-bullets-bullet-list) " ") 'face 'shrface-h5-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-shr-h6 (dom &rest types)
(shr-ensure-paragraph)
(insert (propertize (concat (nth 5 shrface-bullets-bullet-list) " ") 'face 'shrface-h6-face))
(apply #'shrface-shr-fontize-dom dom types)
(shr-ensure-paragraph))
(defun shrface-tag-p (dom)
(let* ((code (with-temp-buffer
(shr-ensure-paragraph)
(shr-generic dom)
(shr-ensure-paragraph)
(setq-local fill-column shrface-paragraph-fill-column)
;; (indent-rigidly (point-min) (point-max) shrface-paragraph-indentation)
(fill-region (point-min) (point-max) nil nil nil)
(buffer-string))))
(insert code)))
(defun shrface-tag-em (dom)
(shrface-shr-fontize-dom dom '(comment t face highlight)))
(defun shrface-tag-a (dom)
(let ((url (dom-attr dom 'href))
(title (dom-attr dom 'title))
(start (point))
shr-start)
(shr-generic dom)
(when (and shr-target-id
(equal (dom-attr dom 'name) shr-target-id))
;; We have a zero-length <a name="foo"> element, so just
;; insert... something.
(when (= start (point))
(shr-ensure-newline)
(insert " "))
(put-text-property start (1+ start) 'shr-target-id shr-target-id))
(when url
(shrface-shr-urlify (or shr-start start) (shr-expand-url url) title))))
;;; enable the faces
(add-to-list 'shr-external-rendering-functions '(em . shrface-tag-em))
(add-to-list 'shr-external-rendering-functions '(h1 . shrface-tag-h1))
(add-to-list 'shr-external-rendering-functions '(h2 . shrface-tag-h2))
(add-to-list 'shr-external-rendering-functions '(h3 . shrface-tag-h3))
(add-to-list 'shr-external-rendering-functions '(h4 . shrface-tag-h4))
(add-to-list 'shr-external-rendering-functions '(h5 . shrface-tag-h5))
(add-to-list 'shr-external-rendering-functions '(h6 . shrface-tag-h6))
(add-to-list 'shr-external-rendering-functions '(a . shrface-tag-a))
(add-to-list 'shr-external-rendering-functions '(p . shrface-tag-p))
(provide 'shrface)