TEC
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config.org
87
config.org
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@ -7064,6 +7064,93 @@ I want to add GitHub-style links on hover for headings.
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(add-to-list 'org-export-filter-headline-functions
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'org-export-html-headline-anchor)
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#+end_src
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**** Link previews
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Sometimes it's nice to make a link particularly prominent, an embed/preview like
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Twitter does would be nice I think.
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We can do this without too much trouble by adding a new link type ever so
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slightly different from =https= --- =Https=.
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#+begin_src emacs-lisp
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(org-link-set-parameters "Https"
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:follow (lambda (url arg) (browse-url (concat "https:" url) arg))
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:export #'org-url-fancy-export)
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#+end_src
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Then, if we can fetch a plist of the form src_elisp{(:title "..." :description
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"..." :image "...")} for such links via a function ~org-url-unfurl-metadata~, we
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can make a fancy export.
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#+begin_src emacs-lisp
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(defun org-url-fancy-export (url _desc backend)
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(let ((metadata (org-url-unfurl-metadata (concat "https:" url))))
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(cond
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((org-export-derived-backend-p backend 'html)
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(concat
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"<div class=\"link-preview\">"
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(format "<a href=\"%s\">" (concat "https:" url))
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(when (plist-get metadata :image)
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(format "<img src=\"%s\"/>" (plist-get metadata :image)))
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"<small>"
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(replace-regexp-in-string "//\\(?:www\\.\\)?\\([^/]+\\)/?.*" "\\1" url)
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"</small><p>"
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(when (plist-get metadata :title)
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(concat "<b>" (org-html-encode-plain-text (plist-get metadata :title)) "</b></br>"))
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(when (plist-get metadata :description)
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(org-html-encode-plain-text (plist-get metadata :description)))
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"</p></a></div>"))
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(t url))))
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#+end_src
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Now we just need to actually implement that metadata extraction function.
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#+begin_src emacs-lisp
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(setq org-url-unfurl-metadata--cache nil)
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(defun org-url-unfurl-metadata (url)
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(cdr (or (assoc url org-url-unfurl-metadata--cache)
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(car (push
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(cons
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url
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(let* ((head-data
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(-filter #'listp
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(cdaddr
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(with-current-buffer (progn (message "Fetching metadata from %s" url)
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(url-retrieve-synchronously url t t 5))
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(goto-char (point-min))
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(delete-region (point-min) (- (search-forward "<head>") 6))
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(delete-region (search-forward "</head>") (point-max))
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(goto-char (point-min))
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(while (re-search-forward "<script[^\u2800]+?</script>" nil t)
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(replace-match ""))
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(goto-char (point-min))
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(while (re-search-forward "<style[^\u2800]+?</style>" nil t)
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(replace-match ""))
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(libxml-parse-html-region (point-min) (point-max))))))
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(meta (delq nil
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(mapcar
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(lambda (tag)
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(when (eq 'meta (car tag))
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(cons (or (cdr (assoc 'name (cadr tag)))
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(cdr (assoc 'property (cadr tag))))
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(cdr (assoc 'content (cadr tag))))))
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head-data))))
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(let ((title (or (cdr (assoc "og:title" meta))
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(cdr (assoc "twitter:title" meta))
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(nth 2 (assq 'title head-data))))
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(description (or (cdr (assoc "og:description" meta))
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(cdr (assoc "twitter:description" meta))
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(cdr (assoc "description" meta))))
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(image (or (cdr (assoc "og:image" meta))
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(cdr (assoc "twitter:image" meta)))))
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(when image
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(setq image (replace-regexp-in-string
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"^/" (concat "https://" (replace-regexp-in-string "//\\([^/]+\\)/?.*" "\\1" url) "/")
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(replace-regexp-in-string
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"^//" "https://"
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image))))
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(list :title title :description description :image image))))
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org-url-unfurl-metadata--cache)))))
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#+end_src
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**** LaTeX Rendering
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***** Pre-rendered
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I consider ~dvisvgm~ to be a rather compelling option. However this isn't scaled
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@ -130,3 +130,36 @@ dl a {
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.image-link, .image-link:hover {
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@include link-reset();
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}
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div.link-preview {
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border: 1px solid $back-medium;
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border-radius: 0.5em;
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overflow: hidden;
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position: relative;
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max-height: 5em;
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padding-left: 0.5em;
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a {
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color: initial;
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text-decoration: none;
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}
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img {
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border-right: 1px solid $back-medium;
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float: left;
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height: 5em;
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margin-left: -0.5em;
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margin-right: 0.5em;
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}
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p {
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margin: 0;
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font-size: 10pt;
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b {
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font-size: 11pt;
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}
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}
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small {
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float: right;
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font-family: sans;
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color: $text-light;
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margin: 0.45em 0.6em;
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}
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}
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@ -1436,6 +1436,33 @@ dl a {
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text-shadow: none;
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text-decoration: none; }
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div.link-preview {
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border: 1px solid var(--back-medium);
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border-radius: 0.5em;
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overflow: hidden;
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position: relative;
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max-height: 5em;
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padding-left: 0.5em; }
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div.link-preview a {
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color: initial;
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text-decoration: none; }
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div.link-preview img {
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border-right: 1px solid var(--back-medium);
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float: left;
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height: 5em;
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margin-left: -0.5em;
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margin-right: 0.5em; }
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div.link-preview p {
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margin: 0;
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font-size: 10pt; }
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div.link-preview p b {
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font-size: 11pt; }
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div.link-preview small {
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float: right;
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font-family: sans;
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color: var(--text-light);
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margin: 0.45em 0.6em; }
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ul, ol, dl {
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list-style: none;
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list-style-position: outside;
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