/usr/share/tdiary/js/prettify/lang-tex.js is in tdiary-contrib 3.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xa0]+/,null,"\t\n\r Â\xa0"],["com",/^%[^\n\r]*/,null,"%"]],[["kwd",/^\\[@-Za-z]+/],["kwd",/^\\./],["typ",/^[$&]/],["lit",/[+-]?(?:\.\d+|\d+(?:\.\d*)?)(cm|em|ex|in|pc|pt|bp|mm)/i],["pun",/^[()=[\]{}]+/]]),["latex","tex"]);
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