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add markdown support for code line numbers and line highlights #2371

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This commit is contained in:
Hakim El Hattab
2020-04-27 10:43:56 +02:00
parent a040ba3b41
commit 951f5d04c2
4 changed files with 105 additions and 18 deletions
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31
plugin/markdown/markdown.js
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@ -13,6 +13,8 @@ const DEFAULT_SLIDE_SEPARATOR = '^\r?\n---\r?\n$',
const SCRIPT_END_PLACEHOLDER = '__SCRIPT_END__';
const CODE_LINE_NUMBER_REGEX = /\[([\s\d,|-]*)\]/;
const Plugin = () => {
// The reveal.js instance this plugin is attached to
@ -408,11 +410,30 @@ const Plugin = () => {
deck = reveal;
// marked can be configured via reveal.js config options
var options = deck.getConfig().markdown;
if( options ) {
marked.setOptions( options );
}
let renderer = new marked.Renderer();
renderer.code = ( code, language ) => {
// Off by default
let lineNumbers = '';
// Users can opt in to show line numbers and highlight
// specific lines.
// ```javascript [] show line numbers
// ```javascript [1,4-8] highlights lines 1 and 4-8
if( CODE_LINE_NUMBER_REGEX.test( language ) ) {
lineNumbers = language.match( CODE_LINE_NUMBER_REGEX )[1].trim();
lineNumbers = `data-line-numbers="${lineNumbers}"`;
language = language.replace( CODE_LINE_NUMBER_REGEX, '' ).trim();
}
return `<pre><code ${lineNumbers} class="${language}">${code}</code></pre>`;
};
marked.setOptions( {
renderer,
...deck.getConfig().markdown
} );
return processSlides( deck.getRevealElement() ).then( convertSlides );