Function: org-html-link
org-html-link is a byte-compiled function defined in ox-html.el.gz.
Signature
(org-html-link LINK DESC INFO)
Documentation
Transcode a LINK object from Org to HTML.
DESC is the description part of the link, or the empty string.
INFO is a plist holding contextual information. See
org-export-data.
Source Code
;; Defined in /usr/src/emacs/lisp/org/ox-html.el.gz
(defun org-html-link (link desc info)
"Transcode a LINK object from Org to HTML.
DESC is the description part of the link, or the empty string.
INFO is a plist holding contextual information. See
`org-export-data'."
(let* ((html-ext (plist-get info :html-extension))
(dot (when (> (length html-ext) 0) "."))
(link-org-files-as-html-maybe
(lambda (raw-path info)
;; Treat links to `file.org' as links to `file.html', if
;; needed. See `org-html-link-org-files-as-html'.
(save-match-data
(cond
((and (plist-get info :html-link-org-files-as-html)
(let ((case-fold-search t))
(string-match "\\(.+\\)\\.org\\(?:\\.gpg\\)?$" raw-path)))
(concat (match-string 1 raw-path) dot html-ext))
(t raw-path)))))
(type (org-element-property :type link))
(raw-path (org-element-property :path link))
;; Ensure DESC really exists, or set it to nil.
(desc (org-string-nw-p desc))
(path
(cond
((member type '("http" "https" "ftp" "mailto" "news"))
(url-encode-url (concat type ":" raw-path)))
((string= "file" type)
;; During publishing, turn absolute file names belonging
;; to base directory into relative file names. Otherwise,
;; append "file" protocol to absolute file name.
(setq raw-path
(org-export-file-uri
(org-publish-file-relative-name raw-path info)))
;; Possibly append `:html-link-home' to relative file
;; name.
(let ((home (and (plist-get info :html-link-home)
(org-trim (plist-get info :html-link-home)))))
(when (and home
(plist-get info :html-link-use-abs-url)
(file-name-absolute-p raw-path))
(setq raw-path (concat (file-name-as-directory home) raw-path))))
;; Maybe turn ".org" into ".html".
(setq raw-path (funcall link-org-files-as-html-maybe raw-path info))
;; Add search option, if any. A search option can be
;; relative to a custom-id, a headline title, a name or
;; a target.
(let ((option (org-element-property :search-option link)))
(if (not option) raw-path
(let ((path (org-element-property :path link)))
(concat raw-path
"#"
(org-publish-resolve-external-link option path t))))))
(t raw-path)))
(attributes-plist
(org-combine-plists
;; Extract attributes from parent's paragraph. HACK: Only
;; do this for the first link in parent (inner image link
;; for inline images). This is needed as long as
;; attributes cannot be set on a per link basis.
(let* ((parent (org-export-get-parent-element link))
(link (let ((container (org-export-get-parent link)))
(if (and (eq 'link (org-element-type container))
(org-html-inline-image-p link info))
container
link))))
(and (eq link (org-element-map parent 'link #'identity info t))
(org-export-read-attribute :attr_html parent)))
;; Also add attributes from link itself. Currently, those
;; need to be added programmatically before `org-html-link'
;; is invoked, for example, by backends building upon HTML
;; export.
(org-export-read-attribute :attr_html link)))
(attributes
(let ((attr (org-html--make-attribute-string attributes-plist)))
(if (org-string-nw-p attr) (concat " " attr) ""))))
(cond
;; Link type is handled by a special function.
((org-export-custom-protocol-maybe link desc 'html info))
;; Image file.
((and (plist-get info :html-inline-images)
(org-export-inline-image-p
link (plist-get info :html-inline-image-rules)))
(org-html--format-image path attributes-plist info))
;; Radio target: Transcode target's contents and use them as
;; link's description.
((string= type "radio")
(let ((destination (org-export-resolve-radio-link link info)))
(if (not destination) desc
(format "<a href=\"#%s\"%s>%s</a>"
(org-export-get-reference destination info)
attributes
desc))))
;; Links pointing to a headline: Find destination and build
;; appropriate referencing command.
((member type '("custom-id" "fuzzy" "id"))
(let ((destination (if (string= type "fuzzy")
(org-export-resolve-fuzzy-link link info)
(org-export-resolve-id-link link info))))
(pcase (org-element-type destination)
;; ID link points to an external file.
(`plain-text
(let ((fragment (concat "ID-" path))
;; Treat links to ".org" files as ".html", if needed.
(path (funcall link-org-files-as-html-maybe
destination info)))
(format "<a href=\"%s#%s\"%s>%s</a>"
path fragment attributes (or desc destination))))
;; Fuzzy link points nowhere.
(`nil
(format "<i>%s</i>"
(or desc
(org-export-data
(org-element-property :raw-link link) info))))
;; Link points to a headline.
(`headline
(let ((href (org-html--reference destination info))
;; What description to use?
(desc
;; Case 1: Headline is numbered and LINK has no
;; description. Display section number.
(if (and (org-export-numbered-headline-p destination info)
(not desc))
(mapconcat #'number-to-string
(org-export-get-headline-number
destination info) ".")
;; Case 2: Either the headline is un-numbered or
;; LINK has a custom description. Display LINK's
;; description or headline's title.
(or desc
(org-export-data
(org-element-property :title destination) info)))))
(format "<a href=\"#%s\"%s>%s</a>" href attributes desc)))
;; Fuzzy link points to a target or an element.
(_
(if (and destination
(memq (plist-get info :with-latex) '(mathjax t))
(eq 'latex-environment (org-element-type destination))
(eq 'math (org-latex--environment-type destination)))
;; Caption and labels are introduced within LaTeX
;; environment. Use "ref" or "eqref" macro, depending on user
;; preference to refer to those in the document.
(format (plist-get info :html-equation-reference-format)
(org-html--reference destination info))
(let* ((ref (org-html--reference destination info))
(org-html-standalone-image-predicate
#'org-html--has-caption-p)
(counter-predicate
(if (eq 'latex-environment (org-element-type destination))
#'org-html--math-environment-p
#'org-html--has-caption-p))
(number
(cond
(desc nil)
((org-html-standalone-image-p destination info)
(org-export-get-ordinal
(org-element-map destination 'link #'identity info t)
info '(link) 'org-html-standalone-image-p))
(t (org-export-get-ordinal
destination info nil counter-predicate))))
(desc
(cond (desc)
((not number) "No description for this link")
((numberp number) (number-to-string number))
(t (mapconcat #'number-to-string number ".")))))
(format "<a href=\"#%s\"%s>%s</a>" ref attributes desc)))))))
;; Coderef: replace link with the reference name or the
;; equivalent line number.
((string= type "coderef")
(let ((fragment (concat "coderef-" (org-html-encode-plain-text path))))
(format "<a href=\"#%s\" %s%s>%s</a>"
fragment
(format "class=\"coderef\" onmouseover=\"CodeHighlightOn(this, \
'%s');\" onmouseout=\"CodeHighlightOff(this, '%s');\""
fragment fragment)
attributes
(format (org-export-get-coderef-format path desc)
(org-export-resolve-coderef path info)))))
;; External link with a description part.
((and path desc)
(format "<a href=\"%s\"%s>%s</a>"
(org-html-encode-plain-text path)
attributes
desc))
;; External link without a description part.
(path
(let ((path (org-html-encode-plain-text path)))
(format "<a href=\"%s\"%s>%s</a>" path attributes path)))
;; No path, only description. Try to do something useful.
(t
(format "<i>%s</i>" desc)))))