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FEATURE: Add KaTeX rendering support (#15)
* FEATURE: Add KaTeX in-browser rendering support. * Remove ttf fonts from KaTeX * Update KaTeX to v0.10.1, fix paths to fonts. Font loading was fixed by rebuilding KaTeX and specifiying absolute paths to fonts in CSS: Steps to build KaTeX: 1. `git clone https://github.com/KaTeX/KaTeX.git && cd KaTeX` `git submodule update --init --recursive` 2. Change paths to fonts: `sed -ri 's/@font-folder.+$/@font-folder: "\/plugins\/discourse-math\/katex\/fonts";/' submodules/katex-fonts/fonts.less` 3. Disable TTF fonts: `export USE_TTF=false` Alternatively, we could modify `.browserslistrc` to match what Discourse supports 3. Build KaTeX `yarn && yarn builld` 4. Copy `katex.min.js` and `katex.min.css` from `dist/` to `discourse-math/public/katex/` 5. Update fonts, copy woff and woff2 files from `submodules/katex-fonts/fonts` * Minor copy edit to settings Mark MathKJax only settings * Add Mhchem extension for KaTeX. It is already automatically loaded for MathJaX.
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## Discourse Math plugin | ||
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Adds MathJax support to your Discourse instance. | ||
Adds LaTeX support to your Discourse instance. | ||
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https://meta.discourse.org/t/discourse-math-plugin/65770 |
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assets/javascripts/initializers/discourse-math-katex.js.es6
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import { withPluginApi } from "discourse/lib/plugin-api"; | ||
import loadScript from "discourse/lib/load-script"; | ||
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function ensureKaTeX() { | ||
return loadScript("/plugins/discourse-math/katex/katex.min.js").then(() => { | ||
return loadScript("/plugins/discourse-math/katex/katex.min.css", { css: true }).then(() => { | ||
return loadScript("/plugins/discourse-math/katex/mhchem.min.js") | ||
}) | ||
}) | ||
} | ||
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function decorate(elem, isPreview) { | ||
const $elem = $(elem); | ||
const displayMode = elem.tagName === 'DIV'; | ||
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if ($elem.data("applied-katex")) { | ||
return; | ||
} | ||
$elem.data("applied-katex", true); | ||
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if ($elem.hasClass("math")) { | ||
const text = $elem.text(); | ||
$elem.text(''); | ||
window.katex.render(text, elem, { displayMode }); | ||
} | ||
} | ||
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function katex($elem) { | ||
if (!$elem || !$elem.find) { | ||
return; | ||
} | ||
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const mathElems = $elem.find(".math"); | ||
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if (mathElems.length > 0) { | ||
const isPreview = $elem.hasClass("d-editor-preview"); | ||
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ensureKaTeX().then(() => { | ||
mathElems.each((idx, elem) => decorate(elem, isPreview)); | ||
}); | ||
} | ||
} | ||
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function initializeMath(api) { | ||
api.decorateCooked(function(elem) { | ||
katex(elem); | ||
}); | ||
} | ||
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export default { | ||
name: "apply-math-katex", | ||
initialize(container) { | ||
const siteSettings = container.lookup("site-settings:main"); | ||
if (siteSettings.discourse_math_enabled && siteSettings.discourse_math_provider === 'katex') { | ||
withPluginApi("0.5", function(api) { | ||
initializeMath(api); | ||
}); | ||
} | ||
} | ||
}; |
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