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os-reveal.el
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;;; ox-reveal.el --- reveal.js Presentation Back-End for Org Export Engine
;; Copyright (C) 2013 Yujie Wen
;; Author: Yujie Wen <yjwen.ty at gmail dot com>
;; Created: 2013-04-27
;; Version: 1.0
;; Package-Requires: ((org "8.3"))
;; Keywords: outlines, hypermedia, slideshow, presentation
;; This file is not part of GNU Emacs.
;;; Copyright Notice:
;; 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;; Please see "Readme.org" for detail introductions.
;; Pull request: Multiplex Support - Stephen Barrett <Stephen dot Barrewtt at scss dot tcd dot ie
;;; Code:
(require 'ox-html)
(require 'cl)
(org-export-define-derived-backend 'reveal 'html
:menu-entry
'(?R "Export to reveal.js HTML Presentation"
((?R "To file" org-reveal-export-to-html)
(?B "To file and browse" org-reveal-export-to-html-and-browse)
(?S "Current subtree to file" org-reveal-export-current-subtree)))
:options-alist
'((:reveal-control nil "reveal_control" nil t)
(:reveal-progress nil "reveal_progress" nil t)
(:reveal-history nil "reveal_history" nil t)
(:reveal-center nil "reveal_center" nil t)
(:reveal-rolling-links nil "reveal_rolling_links" nil t)
(:reveal-slide-number nil "reveal_slide_number" nil t)
(:reveal-keyboard nil "reveal_keyboard" nil t)
(:reveal-overview nil "reveal_overview" nil t)
(:reveal-width nil "reveal_width" nil t)
(:reveal-height nil "reveal_height" nil t)
(:reveal-margin "REVEAL_MARGIN" nil nil t)
(:reveal-min-scale "REVEAL_MIN_SCALE" nil nil t)
(:reveal-max-scale "REVEAL_MAX_SCALE" nil nil t)
(:reveal-root "REVEAL_ROOT" nil org-reveal-root t)
(:reveal-trans "REVEAL_TRANS" nil nil t)
(:reveal-speed "REVEAL_SPEED" nil nil t)
(:reveal-theme "REVEAL_THEME" nil org-reveal-theme t)
(:reveal-extra-css "REVEAL_EXTRA_CSS" nil org-reveal-extra-css newline)
(:reveal-extra-js "REVEAL_EXTRA_JS" nil org-reveal-extra-js nil)
(:reveal-extra-initial-js "REVEAL_EXTRA_INITIAL_JS" nil org-reveal-extra-initial-js newline)
(:reveal-hlevel "REVEAL_HLEVEL" nil nil t)
(:reveal-title-slide "REVEAL_TITLE_SLIDE" "reveal_title_slide" org-reveal-title-slide newline)
(:reveal-slide-global-header nil "reveal_global_header" org-reveal-global-header t)
(:reveal-slide-global-footer nil "reveal_global_footer" org-reveal-global-footer t)
(:reveal-title-slide-background "REVEAL_TITLE_SLIDE_BACKGROUND" nil nil t)
(:reveal-title-slide-background-size "REVEAL_TITLE_SLIDE_BACKGROUND_SIZE" nil nil t)
(:reveal-title-slide-background-position "REVEAL_TITLE_SLIDE_BACKGROUND_POSITION" nil nil t)
(:reveal-title-slide-background-repeat "REVEAL_TITLE_SLIDE_BACKGROUND_REPEAT" nil nil t)
(:reveal-title-slide-background-transition "REVEAL_TITLE_SLIDE_BACKGROUND_TRANSITION" nil nil t)
(:reveal-title-slide-background-opacity "REVEAL_TITLE_SLIDE_BACKGROUND_OPACITY" nil nil t)
(:reveal-toc-slide-background "REVEAL_TOC_SLIDE_BACKGROUND" nil nil t)
(:reveal-toc-slide-background-size "REVEAL_TOC_SLIDE_BACKGROUND_SIZE" nil nil t)
(:reveal-toc-slide-background-position "REVEAL_TOC_SLIDE_BACKGROUND_POSITION" nil nil t)
(:reveal-toc-slide-background-repeat "REVEAL_TOC_SLIDE_BACKGROUND_REPEAT" nil nil t)
(:reveal-toc-slide-background-transition "REVEAL_TOC_SLIDE_BACKGROUND_TRANSITION" nil nil t)
(:reveal-toc-slide-background-opacity "REVEAL_TOC_SLIDE_BACKGROUND_OPACITY" nil nil t)
(:reveal-default-slide-background "REVEAL_DEFAULT_SLIDE_BACKGROUND" nil nil t)
(:reveal-default-slide-background-size "REVEAL_DEFAULT_SLIDE_BACKGROUND_SIZE" nil nil t)
(:reveal-default-slide-background-position "REVEAL_DEFAULT_SLIDE_BACKGROUND_POSITION" nil nil t)
(:reveal-default-slide-background-repeat "REVEAL_DEFAULT_SLIDE_BACKGROUND_REPEAT" nil nil t)
(:reveal-default-slide-background-opacity "REVEAL_DEFAULT_SLIDE_BACKGROUND_OPACITY" nil nil t)
(:reveal-default-slide-background-transition "REVEAL_DEFAULT_SLIDE_BACKGROUND_TRANSITION" nil nil t)
(:reveal-mathjax-url "REVEAL_MATHJAX_URL" nil org-reveal-mathjax-url t)
(:reveal-preamble "REVEAL_PREAMBLE" nil org-reveal-preamble t)
(:reveal-head-preamble "REVEAL_HEAD_PREAMBLE" nil org-reveal-head-preamble newline)
(:reveal-postamble "REVEAL_POSTAMBLE" nil org-reveal-postamble t)
(:reveal-multiplex-id "REVEAL_MULTIPLEX_ID" nil org-reveal-multiplex-id nil)
(:reveal-multiplex-secret "REVEAL_MULTIPLEX_SECRET" nil org-reveal-multiplex-secret nil)
(:reveal-multiplex-url "REVEAL_MULTIPLEX_URL" nil org-reveal-multiplex-url nil)
(:reveal-multiplex-socketio-url "REVEAL_MULTIPLEX_SOCKETIO_URL" nil org-reveal-multiplex-socketio-url nil)
(:reveal-slide-header "REVEAL_SLIDE_HEADER" nil org-reveal-slide-header t)
(:reveal-slide-footer "REVEAL_SLIDE_FOOTER" nil org-reveal-slide-footer t)
(:reveal-plugins "REVEAL_PLUGINS" nil nil t)
(:reveal-external-plugins "REVEAL_EXTERNAL_PLUGINS" nil nil newline)
(:reveal-default-frag-style "REVEAL_DEFAULT_FRAG_STYLE" nil org-reveal-default-frag-style t)
(:reveal-single-file nil "reveal_single_file" org-reveal-single-file t)
(:reveal-init-script "REVEAL_INIT_SCRIPT" nil org-reveal-init-script space)
(:reveal-init-options "REVEAL_INIT_OPTIONS" nil org-reveal-init-options newline)
(:reveal-highlight-css "REVEAL_HIGHLIGHT_CSS" nil org-reveal-highlight-css nil)
(:reveal-reveal-js-version "REVEAL_REVEAL_JS_VERSION" nil nil t)
)
:translate-alist
'((headline . org-reveal-headline)
(inner-template . org-reveal-inner-template)
(item . org-reveal-item)
(keyword . org-reveal-keyword)
(link . org-reveal-link)
(latex-environment . org-reveal-latex-environment)
(latex-fragment . (lambda (frag contents info)
(setq info (plist-put info :reveal-mathjax t))
(org-html-latex-fragment frag contents info)))
(plain-list . org-reveal-plain-list)
(quote-block . org-reveal-quote-block)
(section . org-reveal-section)
(src-block . org-reveal-src-block)
(special-block . org-reveal-special-block)
(template . org-reveal-template))
:filters-alist '((:filter-parse-tree . org-reveal-filter-parse-tree))
)
(defcustom org-reveal-root "./reveal.js"
"The root directory of reveal.js packages. It is the directory
within which js/reveal.js is."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-hlevel 1
"The minimum level of headings that should be grouped into
vertical slides."
:group 'org-export-reveal
:type 'integer)
(defun org-reveal--get-hlevel (info)
"Get HLevel value safely.
If option \"REVEAL_HLEVEL\" is set, retrieve integer value from it,
else get value from custom variable `org-reveal-hlevel'."
(let ((hlevel-str (plist-get info :reveal-hlevel)))
(if hlevel-str (string-to-number hlevel-str)
org-reveal-hlevel)))
(defcustom org-reveal-title-slide 'auto
"Non-nil means insert a title slide.
When set to `auto', an automatic title slide is generated. When
set to a string, use this string as a format string for title
slide, where the following escaping elements are allowed:
%t stands for the title
%a stands for the author's name.
%e stands for the author's email.
%d stands for the date.
%% stands for a literal %."
:group 'org-export-reveal
:type '(choice (const :tag "No title slide" nil)
(const :tag "Auto title slide" 'auto)
(string :tag "Custom title slide")))
(defcustom org-reveal-init-options
""
"Reveal.js initialization options, JS code snippet to be
embedded into Reveal.initialize()."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-transition
"default"
"Reveal transition style."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-theme
"moon"
"Reveal theme."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-extra-js
""
"URL to extra JS file."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-extra-initial-js
""
"Scripts to be embedded into reveal.js initialization."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-extra-css
""
"URL to extra css file."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-multiplex-id ""
"The ID to use for multiplexing."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-multiplex-secret ""
"The secret to use for master slide."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-multiplex-url ""
"The url of the socketio server."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-multiplex-socketio-url
""
"the url of the socketio.js library"
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-mathjax-url
"https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS-MML_HTMLorMML"
"Default MathJax URL."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-preamble nil
"Preamble contents."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-head-preamble nil
"Preamble contents for head part."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-postamble nil
"Postamble contents."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-slide-header nil
"HTML content used as Reveal.js slide header"
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-global-header nil
"If non nil, slide header defined in org-reveal-slide-header
is displayed also on title and toc slide"
:group 'org-export-reveal
:type 'boolean)
(defcustom org-reveal-global-footer nil
"If non nil, slide footer defined in org-reveal-slide-footer
is displayed also on title and toc slide"
:group 'org-export-reveal
:type 'boolean)
(defcustom org-reveal-slide-footer nil
"HTML content used as Reveal.js slide footer"
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-default-frag-style nil
"Default fragment style."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-plugins
'(classList markdown zoom notes)
"Default builtin plugins"
:group 'org-export-reveal
:type '(set
(const classList)
(const markdown)
(const highlight)
(const zoom)
(const notes)
(const search)
(const remotes)
(const multiplex)))
(defcustom org-reveal-external-plugins nil
"Additional third-party Plugins to load with reveal.
Each entry should contain a name and an expression of the form
\"{src: '%srelative/path/from/reveal/root', async:true/false,condition: jscallbackfunction(){}}\"
Note that some plugins have dependencies such as jquery; these must be included here as well,
BEFORE the plugins that depend on them."
:group 'org-export-reveal
:type 'alist)
(defcustom org-reveal-single-file nil
"Export presentation into one single HTML file, which embedded
JS scripts and pictures."
:group 'org-export-reveal
:type 'boolean)
(defcustom org-reveal-init-script nil
"Custom script that will be passed to Reveal.initialize."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-highlight-css "%r/lib/css/zenburn.css"
"Highlight.js CSS file."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-note-key-char "n"
"If not nil, org-reveal-note-key-char's value is registered as
the key character to Org-mode's structure completion for
Reveal.js notes. When `<' followed by the key character are
typed and then the completion key is pressed, which is usually
`TAB', \"#+BEGIN_NOTES\" and \"#+END_NOTES\" is inserted.
The default value is \"n\". Set the variable to nil to disable
registering the completion"
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-klipsify-src nil
"Set to non-nil if you would like to make source code blocks editable in exported presentation."
:group 'org-export-reveal
:type 'boolean)
(defcustom org-reveal-klipse-css "https://storage.googleapis.com/app.klipse.tech/css/codemirror.css"
"Location of the codemirror css file for use with klipse."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-klipse-js "https://storage.googleapis.com/app.klipse.tech/plugin_prod/js/klipse_plugin.min.js"
"location of the klipse js source code."
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-slide-id-head "slide-"
"The heading string for slide ID"
:group 'org-export-reveal
:type 'string)
(defcustom org-reveal-ignore-speaker-notes nil
"Ignore speaker notes."
:group 'org-export-reveal
:type 'boolean)
(defcustom org-reveal-reveal-js-version nil
"Reveal.js version. Determine the locations of reveal.js scripts, CSS and the"
:group 'org-export-reveal
:type '(radio (const :tag "Reveal.js 4.0 and later" 4)
(const :tag "Reveal.js 3.x and before" 3)
(const :tag "Automatic" nil)))
(defun org-reveal--get-reveal-js-version (info)
"Get reveal.js version value safely.
If option \"REVEAL_REVEAL_JS_VERSION\" is set, retrieve integer
value from it, else get value from custom variable
`org-reveal-reveal-js-version'."
(let ((version-str (plist-get info :reveal-reveal-js-version)))
(if version-str (string-to-number version-str)
org-reveal-reveal-js-version)))
(defun if-format (fmt val)
(if val (format fmt val) ""))
(defun frag-style (frag info)
"Return proper fragment string according to FRAG and the default fragment style.
FRAG is the fragment style set on element, INFO is a plist
holding contextual information."
(cond
((string= frag t)
(let ((default-frag-style (plist-get info :reveal-default-frag-style)))
(if default-frag-style (format "fragment %s" default-frag-style)
"fragment")))
(t (format "fragment %s" frag))))
(defun frag-class (elem info)
"Return proper HTML string description of fragment style.
BLOCK is the element, INFO is a plist holding contextual
information."
(let ((frag (org-export-read-attribute :attr_reveal elem :frag)))
(and frag
(format " class=\"%s\"%s"
(frag-style frag info)
(let ((frag-index (org-export-read-attribute :attr_reveal elem :frag_idx)))
(if frag-index
(format " data-fragment-index=\"%s\"" frag-index)
""))))))
(defun org-reveal-special-block (special-block contents info)
"Transcode a SPECIAL-BLOCK element from Org to Reveal.
CONTENTS holds the contents of the block. INFO is a plist
holding contextual information.
If the block type is 'NOTES', transcode the block into a
Reveal.js slide note. Otherwise, export the block as by the HTML
exporter."
(let ((block-type (org-element-property :type special-block)))
(if (string= (upcase block-type) "NOTES")
(if org-reveal-ignore-speaker-notes
""
(format "<aside class=\"notes\">\n%s\n</aside>\n" contents))
(org-html-special-block special-block contents info))))
(defun org-reveal-is-background-img (info)
"Check if a background string is an image format or not."
(and info
(string-match-p
"\\(\\(^\\(http\\|https\\|file\\)://\\)\\|\\(\\\.\\(svg\\|png\\|jpg\\|jpeg\\|gif\\|bmp\\)\\([?#\\\s]\\|$\\)\\)\\)"
info)))
(defun org-reveal-slide-section-tag (headline info for-split)
"Generate the <section> tag for a slide."
(let* ((preferred-id (or (org-element-property :CUSTOM_ID headline)
(org-export-get-reference headline info)))
(default-slide-background (plist-get info :reveal-default-slide-background))
(default-slide-background-size (plist-get info :reveal-default-slide-background-size))
(default-slide-background-position (plist-get info :reveal-default-slide-background-position))
(default-slide-background-repeat (plist-get info :reveal-default-slide-background-repeat))
(default-slide-background-transition (plist-get info :reveal-default-slide-background-transition))
(slide-background-iframe (org-element-property :REVEAL_BACKGROUND_IFRAME headline))
)
(if slide-background-iframe
;; for iframe, we will wrap the slide in a new div
;; all the background configuration of the original slide will be used for this new div
(format "<section %s data-background-interactive>\n<div %s>\n"
(org-html--make-attribute-string
`(:id ,(concat org-reveal-slide-id-head
preferred-id
(if for-split "-split" ""))
:class ,(org-element-property :HTML_CONTAINER_CLASS headline)
:data-transition ,(org-element-property :REVEAL_DATA_TRANSITION headline)
:data-state ,(org-element-property :REVEAL_DATA_STATE headline) ;; 3.9 legacy
:data-background-iframe ,slide-background-iframe))
(concat
"style=\""
(let ((attr (or (org-element-property :REVEAL_BACKGROUND headline)
default-slide-background)))
(if (org-reveal-is-background-img attr)
(format "background-image: url('%s'); " attr)
(if-format "background: %s; " attr)))
(let ((attr (or (org-element-property :REVEAL_BACKGROUND_REPEAT headline)
default-slide-background-repeat)))
(if-format "background-repeat: %s; " attr))
(let ((attr (or (org-element-property :REVEAL_BACKGROUND_SIZE headline)
default-slide-background)))
(if-format "background-size: %s; " attr))
(let ((attr (or (org-element-property :REVEAL_BACKGROUND_POSITION headline)
default-slide-background)))
(if-format "position: %s; " attr))
(let ((attr (or (org-element-property :REVEAL_BACKGROUND_OPACITY headline)
default-slide-background)))
(if-format "opacity: %s; " attr))
(let ((extra-attrs (org-element-property :REVEAL_EXTRA_ATTR headline)))
(if-format "%s;" extra-attrs))
"\""))
(format "<section %s%s>\n"
(org-html--make-attribute-string
`(:id ,(concat org-reveal-slide-id-head
preferred-id
(if for-split "-split" ""))
:class ,(org-element-property :HTML_CONTAINER_CLASS headline)
:data-transition ,(org-element-property :REVEAL_DATA_TRANSITION headline)
:data-state ,(org-element-property :REVEAL_DATA_STATE headline) ;; 3.9 legacy
:data-background ,(or (org-element-property :REVEAL_BACKGROUND headline)
default-slide-background)
:data-background-size ,(or (org-element-property :REVEAL_BACKGROUND_SIZE headline)
default-slide-background-size)
:data-background-position ,(or (org-element-property :REVEAL_BACKGROUND_POSITION headline)
default-slide-background-position)
:data-background-repeat ,(or (org-element-property :REVEAL_BACKGROUND_REPEAT headline)
default-slide-background-repeat)
:data-background-transition ,(or (org-element-property :REVEAL_BACKGROUND_TRANS headline)
default-slide-background-transition)
:data-background-opacity
,(or (org-element-property :REVEAL_BACKGROUND_OPACITY headline)
(plist-get info :reveal-default-slide-background-opacity))))
(let ((extra-attrs (org-element-property :REVEAL_EXTRA_ATTR headline)))
(if-format " %s" extra-attrs))))))
;; Copied from org-html-headline and modified to embed org-reveal
;; specific attributes.
(defun org-reveal-headline (headline contents info)
"Transcode a HEADLINE element from Org to HTML.
CONTENTS holds the contents of the headline. INFO is a plist
holding contextual information."
(unless (org-element-property :footnote-section-p headline)
(if (org-export-low-level-p headline info)
;; This is a deep sub-tree: export it as in ox-html.
(org-html-headline headline contents info)
;; Standard headline. Export it as a slide
(let* ((level (org-export-get-relative-level headline info))
(section-number (mapconcat #'number-to-string
(org-export-get-headline-number headline info)
"-"))
(hlevel (org-reveal--get-hlevel info))
(header (plist-get info :reveal-slide-header))
(header-div (when header (format "<div class=\"slide-header\">%s</div>\n" header)))
(footer (plist-get info :reveal-slide-footer))
(footer-div (when footer (format "<div class=\"slide-footer\">%s</div>\n" footer)))
(first-sibling (org-export-first-sibling-p headline info))
(last-sibling (org-export-last-sibling-p headline info)))
(concat
(if (or (/= level 1) (not first-sibling))
;; Not the first heading. Close previous slide.
(concat
;; Slide footer if any
footer-div
;; Close previous slide
"</section>\n"
(if (<= level hlevel)
;; Close previous vertical slide group.
"</section>\n")))
(if (<= level hlevel)
;; Add an extra "<section>" to group following slides
;; into vertical slide group. Transition override
;; attributes are attached at this level, too.
(let ((attrs
(org-html--make-attribute-string
`(:data-transition ,(org-element-property :REVEAL_DATA_TRANSITION headline)))))
(if (string= attrs "")
"<section>\n"
(format "<section %s>\n" attrs))))
;; Start a new slide.
(org-reveal-slide-section-tag headline info nil)
;; Slide header if any.
header-div
;; The HTML content of the headline
;; Strip the <div> tags, if any
(let ((html (org-html-headline headline contents info)))
(if (string-prefix-p "<div" html)
;; Remove the first <div> and the last </div> tags from html
(concat "<"
(mapconcat 'identity
(butlast (cdr (split-string html "<" t)))
"<"))
;; Return the HTML content unchanged
html))
(if (and (= level 1)
(org-export-last-sibling-p headline info))
;; Last head 1. Close all slides.
(concat
;; Slide footer if any
footer-div
(if (org-element-property :REVEAL_BACKGROUND_IFRAME headline)
"</div>")
"</section>\n</section>\n")
(if (org-element-property :REVEAL_BACKGROUND_IFRAME headline)
"</div>")))))))
(defgroup org-export-reveal nil
"Options for exporting Orgmode files to reveal.js HTML pressentations."
:tag "Org Export Reveal"
:group 'org-export)
(defun org-reveal--read-file (file)
"Return the content of file"
(with-temp-buffer
(insert-file-contents-literally file)
(buffer-string)))
(defun org-reveal--file-url-to-path (url)
"Convert URL that points to local files to file path."
(replace-regexp-in-string
(if (string-equal system-type "windows-nt") "^file:///" "^file://")
"" url))
(defun org-reveal--css-label (in-single-file file-name style-id)
"Generate an HTML label for including a CSS file, if
IN-SINGLE-FILE is t, the content of FILE-NAME is embedded,
otherwise, a `<link>' label is generated."
(when (and file-name (not (string= file-name "")))
(if in-single-file
;; Single-file
(let ((local-file-name (org-reveal--file-url-to-path file-name)))
(if (file-readable-p local-file-name)
(concat "<style type=\"text/css\">\n"
(org-reveal--read-file local-file-name)
"\n</style>\n")
;; But file is not readable.
(error "Cannot read %s" file-name)))
;; Not in-single-file
(concat "<link rel=\"stylesheet\" href=\"" file-name "\""
(if style-id (format " id=\"%s\"" style-id))
"/>\n"))))
;; Choose path by reveal.js version
;;
;; Side-effect: When org-reveal-reveal-js-version is nil, updated it
;; to determined version if possible
(defun org-reveal--choose-path (root-path version file-path-0 file-path-1)
(if (or (eq version 4) ;; Explict reveal.js 4.0
(and (not version)
;; Automatic location. Choose an existing path
(let ((root-file-path
;; root-path could be a local file path or a URL. Try to
;; extract the local root path from root-path
(cond ((string-prefix-p "file://" root-path)
;; A local file URL
(substring root-path 7))
((or (string-prefix-p "http://" root-path)
(string-prefix-p "https://" root-path))
;; A remote URL
nil)
;; Otherwise, assuming it is a local file path
(t root-path))))
(or (not root-file-path) ;; Not a local URL, assuming file-path-0 exists
(when (file-exists-p (concat root-file-path file-path-0))
(setq org-reveal-reveal-js-version 4)
t)))))
(concat root-path file-path-0)
(concat root-path file-path-1)))
(defun org-reveal-stylesheets (info)
"Return the HTML contents for declaring reveal stylesheets
using custom variable `org-reveal-root'."
(let* ((root-path (file-name-as-directory (plist-get info :reveal-root)))
(version (org-reveal--get-reveal-js-version info))
(reveal-css (org-reveal--choose-path root-path version "dist/reveal.css" "css/reveal.css"))
(theme (plist-get info :reveal-theme))
(theme-css (org-reveal--choose-path root-path
version
(concat "dist/theme/" theme ".css")
(concat "css/theme/" theme ".css")))
(extra-css (plist-get info :reveal-extra-css))
(in-single-file (plist-get info :reveal-single-file)))
(concat
;; Default embedded style sheets
"<style type=\"text/css\">
.underline { text-decoration: underline; }
</style>
"
;; stylesheets
(mapconcat (lambda (elem) (org-reveal--css-label in-single-file (car elem) (cdr elem)))
(append (list (cons reveal-css nil)
(cons theme-css "theme"))
(mapcar (lambda (a) (cons a nil))
(split-string extra-css "\n")))
"\n")
;; Include CSS for highlight.js if necessary
(if (org-reveal--using-highlight.js info)
(format "<link rel=\"stylesheet\" href=\"%s\"/>"
(format-spec (plist-get info :reveal-highlight-css)
`((?r . ,(directory-file-name root-path))))))
;; print-pdf
(if in-single-file ""
(format "
<!-- If the query includes 'print-pdf', include the PDF print sheet -->
<script>
if( window.location.search.match( /print-pdf/gi ) ) {
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = '%scss/print/pdf.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
}
</script>
"
root-path)))))
(defun org-reveal-mathjax-scripts (info)
"Return the HTML contents for declaring MathJax scripts"
(if (plist-get info :reveal-mathjax)
;; MathJax enabled.
(format "<script type=\"text/javascript\" src=\"%s\"></script>\n"
(plist-get info :reveal-mathjax-url))))
(defun org-reveal--get-plugins (info)
(let ((buffer-plugins (condition-case e
(car (read-from-string (plist-get info :reveal-plugins)))
(end-of-file nil)
(wrong-type-argument nil))))
(or (and buffer-plugins (listp buffer-plugins) buffer-plugins)
org-reveal-plugins)))
(defun org-reveal-scripts (info)
"Return the necessary scripts for initializing reveal.js using
custom variable `org-reveal-root'."
(let* ((root-path (file-name-as-directory (plist-get info :reveal-root)))
(version (org-reveal--get-reveal-js-version info))
(reveal-js (org-reveal--choose-path root-path version "dist/reveal.js" "js/reveal.js"))
;; Local files
(local-root-path (org-reveal--file-url-to-path root-path))
(local-reveal-js (org-reveal--choose-path local-root-path version "dist/reveal.js" "js/reveal.js"))
(reveal-4-plugin (if (eq 4 (org-reveal--get-reveal-js-version info))
(org-reveal-plugin-scripts-4 info)
(cons nil nil)))
(in-single-file (plist-get info :reveal-single-file)))
(concat
;; reveal.js/js/reveal.js
(if (and in-single-file
(file-readable-p local-reveal-js))
;; Embed scripts into HTML
(concat "<script>\n"
(org-reveal--read-file local-reveal-js)
"\n</script>")
;; Fall-back to extern script links
(if in-single-file
;; Tried to embed scripts but failed. Print a message about possible errors.
(error (concat "Cannot read "
(mapconcat 'identity
(delq nil (mapcar (lambda (file) (if (not (file-readable-p file)) file))
(list local-reveal-js)))
", "))))
(concat
"<script src=\"" reveal-js "\"></script>\n"))
;; plugin headings
(if-format "%s\n" (car reveal-4-plugin))
"
<script>
// Full list of configuration options available here:
// https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
"
(if-format "%s,\n" (cdr reveal-4-plugin))
(let ((options (plist-get info :reveal-init-options)))
(and (string< "" options)
(format "%s,\n" options)))
;; multiplexing - depends on defvar 'client-multiplex'
(when (plist-get info :reveal-multiplex-id)
(format
"multiplex: {
secret: %s, // null if client
id: '%s', // id, obtained from socket.io server
url: '%s' // Location of socket.io server
},\n"
(if (eq client-multiplex nil)
(format "'%s'" (plist-get info :reveal-multiplex-secret))
(format "null"))
(plist-get info :reveal-multiplex-id)
(plist-get info :reveal-multiplex-url)))
(let ((extra-initial-js (plist-get info :reveal-extra-initial-js)))
(unless (string= extra-initial-js "")
(format "%s,\n" extra-initial-js)))
;; optional JS library heading
(if in-single-file ""
(concat
"
// Optional libraries used to extend on reveal.js
dependencies: [
"
;; JS libraries
(let* ((builtins
'(classList (format " { src: '%slib/js/classList.js', condition: function() { return !document.body.classList; } }" root-path)
markdown (format " { src: '%splugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: '%splugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } }" root-path root-path)
highlight (format " { src: '%splugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } }" root-path)
zoom (format " { src: '%splugin/zoom-js/zoom.js', async: true, condition: function() { return !!document.body.classList; } }" root-path)
notes (format " { src: '%splugin/notes/notes.js', async: true, condition: function() { return !!document.body.classList; } }" root-path)
search (format " { src: '%splugin/search/search.js', async: true, condition: function() { return !!document.body.classList; } }" root-path)
remotes (format " { src: '%splugin/remotes/remotes.js', async: true, condition: function() { return !!document.body.classList; } }" root-path)
;; multiplex setup for reveal.js 3.x
multiplex (format " { src: '%s', async: true },\n%s"
(plist-get info :reveal-multiplex-socketio-url)
; following ensures that either client.js or master.js is included depending on defva client-multiplex value state
(if (not client-multiplex)
(progn
(if (plist-get info :reveal-multiplex-secret)
(setq client-multiplex t))
(format " { src: '%splugin/multiplex/master.js', async: true }" root-path))
(format " { src: '%splugin/multiplex/client.js', async: true }" root-path)))))
(builtin-codes
(let ((plugins (org-reveal--get-plugins info)))
(if (eq version 4)
;; For reveal.js 4.x, skip the builtin plug-in
;; codes except multiplex as all other plug-ins
;; in 4.x are specified by separate <script>
;; blocks
(let ((url (plist-get info :reveal-multiplex-url)))
(if (memq 'multiplex plugins)
(list (format " { src: '%s/socket.io/socket.io.js', async: true }, { src: '%s/%s', async: true } "
url url
(if client-multiplex "client.js"
(progn
(setq client-multiplex t)
"master.js"))))
'()))
(mapcar (lambda (p)
(eval (plist-get builtins p)))
plugins))))
(external-plugins
(append
;; Global setting
(cl-loop for (key . value) in org-reveal-external-plugins
collect (format value root-path ))
;; Local settings
(let ((local-plugins (plist-get info :reveal-external-plugins)))
(and local-plugins
(list (format local-plugins root-path))))))
(all-plugins (if external-plugins (append external-plugins builtin-codes) builtin-codes))
(extra-codes (plist-get info :reveal-extra-js))
(total-codes
(if (string= "" extra-codes) all-plugins (append (list extra-codes) all-plugins))))
(mapconcat 'identity total-codes ",\n"))
"]\n"
))
(let ((init-script (plist-get info :reveal-init-script)))
(if init-script (concat (if in-single-file "" ",") init-script)))
"});\n</script>\n")))
(defun org-reveal-plugin-scripts-4 (info)
"Return scripts for initializing reveal.js 4.x builtin scripts"
(let ((plugins (org-reveal--get-plugins info)))
(if (not (null plugins))
;; Generate plugin scripts
(let* ((available-plugins
'(highlight ("RevealHighlight" . "highlight/highlight.js")
markdown ("RevealMarkdown" . "markdown/markdown.js")
search ("RevealSearch" . "search/search.js")
notes ("RevealNotes" . "notes/notes.js")
math ("RevealMath" . "math/math.js")
zoom ("RevealZoom" . "zoom/zoom.js")))
(plugin-info (seq-filter 'identity
(seq-map (lambda (p)
(plist-get available-plugins p))
plugins))))
(if (not (null plugin-info))
(cons
;; Plugin initialization script
(let ((root-path (file-name-as-directory (plist-get info :reveal-root))))
(mapconcat
(lambda (p)
(format "<script src=\"%splugin/%s\"></script>\n" root-path (cdr p)))
plugin-info
""))
;; Reveal initialization for plugins
(format "plugins: [%s]"
(mapconcat #'car plugin-info ",")))
;; No available plugin info found. Perhaps wrong plugin
;; names are given
(cons nil nil)))
;; No plugins, return empty string
(cons nil nil))))
(defun org-reveal-toc (depth info)
"Build a slide of table of contents."
(let ((toc (org-html-toc depth info)))
(when toc
(let ((toc-slide-background (plist-get info :reveal-toc-slide-background))
(toc-slide-background-size (plist-get info :reveal-toc-slide-background-size))
(toc-slide-background-position (plist-get info :reveal-toc-slide-background-position))
(toc-slide-background-repeat (plist-get info :reveal-toc-slide-background-repeat))
(toc-slide-background-transition (plist-get info :reveal-toc-slide-background-transition))
(toc-slide-background-opacity (plist-get info :reveal-toc-slide-background-opacity))
(toc-slide-with-header (plist-get info :reveal-slide-global-header))
(toc-slide-with-footer (plist-get info :reveal-slide-global-footer)))
(concat "<section id=\"table-of-contents\""
(when toc-slide-background
(concat " data-background=\"" toc-slide-background "\""))
(when toc-slide-background-size
(concat " data-background-size=\"" toc-slide-background-size "\""))
(when toc-slide-background-position
(concat " data-background-position=\"" toc-slide-background-position "\""))
(when toc-slide-background-repeat
(concat " data-background-repeat=\"" toc-slide-background-repeat "\""))
(when toc-slide-background-transition
(concat " data-background-transition=\"" toc-slide-background-transition "\""))
(when toc-slide-background-opacity
(concat " data-background-opacity=\"" toc-slide-background-opacity "\""))
">"
(when toc-slide-with-header
(let ((header (plist-get info :reveal-slide-header)))
(when header (format "<div class=\"slide-header\">%s</div>\n" header))))
(replace-regexp-in-string "<a href=\"#" "<a href=\"#/slide-" toc)
(when toc-slide-with-footer
(let ((footer (plist-get info :reveal-slide-footer)))
(when footer (format "<div class=\"slide-footer\">%s</div>\n" footer))))
"</section>\n")))))
(defun org-reveal-inner-template (contents info)
"Return body of document string after HTML conversion.
CONTENTS is the transcoded contents string. INFO is a plist
holding export options."
(concat
;; Table of contents.
(let ((depth (plist-get info :with-toc)))
(when (and depth
(not (plist-get info :reveal-subtree)))
(org-reveal-toc depth info)))
;; Document contents.
contents))
(defun org-reveal-parse-token (keyword info key &optional value)
"Return HTML tags or perform SIDE EFFECT according to key.
Use the previous section tag as the tag of the split section. "
(case (intern key)
(split
(let ((headline (org-element-property
:parent
(org-element-property
:parent
keyword))))
(concat
"</section>\n" ;; Close the previous section and start a new one.
(org-reveal-slide-section-tag headline info t)
(and value
(string= value "t")
;; Add a title for the split slide
;; Copy from `org-html-headline' and modified.
(let* ((title (org-export-data
(org-element-property :title headline)
info))
(level (+ (org-export-get-relative-level headline info)
(1- (plist-get info :html-toplevel-hlevel))))
(numberedp (org-export-numbered-headline-p headline info))
(numbers (org-export-get-headline-number headline info)))
(format "\n<h%d>%s</h%d>"
level
(concat
(and numberedp
(format
"<span class=\"section-number-%d\">%s</span> "
level
(mapconcat #'number-to-string numbers ".")))
title)
level))))))))
(defun org-reveal-parse-keyword-value (keyward value info)
"According to the value content, return HTML tags to split slides."
(let ((tokens (mapcar
(lambda (x) (split-string x ":"))
(split-string value))))
(mapconcat
(lambda (x) (apply 'org-reveal-parse-token keyward info x))
tokens
"")))
;; Copied from org-html-format-list-item. Overwrite HTML class
;; attribute when there is attr_html attributes.
(defun org-reveal-format-list-item (contents type checkbox attributes info
&optional term-counter-id
headline)
"Format a list item into HTML."
(let ((attr-html (cond (attributes (format " %s" (org-html--make-attribute-string attributes)))
(checkbox (format " class=\"%s\"" (symbol-name checkbox)))
(t "")))
(checkbox (concat (org-html-checkbox checkbox info)
(and checkbox " ")))
(br (org-html-close-tag "br" nil info)))
(concat
(case type
(ordered
(let* ((counter term-counter-id)
(extra (if counter (format " value=\"%s\"" counter) "")))
(concat
(format "<li%s%s>" attr-html extra)
(when headline (concat headline br)))))
(unordered
(let* ((id term-counter-id)
(extra (if id (format " id=\"%s\"" id) "")))
(concat
(format "<li%s%s>" attr-html extra)
(when headline (concat headline br)))))
(descriptive
(let* ((term term-counter-id))
(setq term (or term "(no term)"))
;; Check-boxes in descriptive lists are associated to tag.
(concat (format "<dt%s>%s</dt>"
attr-html (concat checkbox term))
(format "<dd%s>" attr-html)))))
(unless (eq type 'descriptive) checkbox)
(and contents (org-trim contents))
(case type
(ordered "</li>")
(unordered "</li>")
(descriptive "</dd>")))))
;; Copied from org-html-item, changed to call
;; org-reveal-format-list-item.
(defun org-reveal-item (item contents info)
"Transcode an ITEM element from Org to Reveal.
CONTENTS holds the contents of the item. INFO is a plist holding
contextual information."
(let* ((plain-list (org-export-get-parent item))
(type (org-element-property :type plain-list))
(counter (org-element-property :counter item))
(attributes (org-export-read-attribute :attr_html item))
; (attributes (org-html--make-attribute-string (org-export-read-attribute :attr_html item)))
(checkbox (org-element-property :checkbox item))
(tag (let ((tag (org-element-property :tag item)))
(and tag (org-export-data tag info)))))
(org-reveal-format-list-item
contents type checkbox attributes info (or tag counter))))
(defun org-reveal-keyword (keyword contents info)
"Transcode a KEYWORD element from Org to Reveal,
and may change custom variables as SIDE EFFECT.
CONTENTS is nil. INFO is a plist holding contextual information."
(let ((key (org-element-property :key keyword))
(value (org-element-property :value keyword)))
(case (intern key)
(REVEAL (org-reveal-parse-keyword-value keyword value info))
(REVEAL_HTML value)
(HTML value))))
(defun org-reveal-embedded-svg (path)