reveal-js-base-theme/plugin/markdown/markdown.js

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// From https://gist.github.com/1343518
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// Modified by Hakim to handle Markdown indented with tabs
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(function(){
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if( typeof Showdown === 'undefined' ) {
throw 'The reveal.js Markdown plugin requires Showdown to be loaded';
}
var sections = document.querySelectorAll( '[data-markdown]' );
for( var i = 0, len = sections.length; i < len; i++ ) {
var section = sections[i];
var template = section.querySelector( 'script' );
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// strip leading whitespace so it isn't evaluated as code
var text = ( template || section ).innerHTML;
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var leadingWs = text.match(/^\n?(\s*)/)[1].length,
leadingTabs = text.match(/^\n?(\t*)/)[1].length;
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if( leadingTabs > 0 ) {
text = text.replace( new RegExp('\\n?\\t{' + leadingTabs + '}','g'), '\n' );
}
else if( leadingWs > 1 ) {
text = text.replace( new RegExp('\\n? {' + leadingWs + '}','g'), '\n' );
}
section.innerHTML = (new Showdown.converter()).makeHtml(text);
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}
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})();