8 changed files with 160 additions and 2 deletions
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node_modules |
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This was made by Standa Lukeš @exyi |
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console.log(require('katex').renderToString('\\frac{2a}{b}')) |
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// KaTeX rendering server
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// Listens on unix socket, path is provided as first argument
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// Expects JSON lines, each line is a query with the following schema:
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// {
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// formulas: [
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// {
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// tex: string,
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// options?: object
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// }
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// ],
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// options?: object
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// }
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// see https://katex.org/docs/options.html for list of available options
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// If options formulas[].options field is used, the global options field is ignored.
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// For each line, returns one JSON line with the following schema:
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// {
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// results: [
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// { html?: string } | { error?: string }
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// ]
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// } | { error?: string }
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// If one formula is invalid, the error in results is used
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// If the entire query is invalid (couldn't parse JSON, for example), the outer error field is used
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import katex from 'katex' |
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import net from 'net' |
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import * as readline from 'readline' |
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const myArgs = process.argv.slice(2) |
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const unixSocketPath = myArgs[0] |
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if (!unixSocketPath) { |
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console.error('you must specify socket path') |
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process.exit(1) |
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} |
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// This server listens on a Unix socket at /var/run/mysocket
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var unixServer = net.createServer(handleClient); |
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unixServer.listen(unixSocketPath); |
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function handleExit(signal) { |
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// unixServer.emit('close')
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unixServer.close(function () { |
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}); |
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process.exit(0); // put this into the callback to avoid closing open connections
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} |
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process.on('SIGINT', handleExit); |
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process.on('SIGQUIT', handleExit); |
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process.on('SIGTERM', handleExit); |
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process.on('exit', handleExit); |
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const defaultOptions = {} |
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/** |
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* @param {net.Socket} socket |
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* @returns {Promise<void>} |
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* */ |
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function socketWrite(socket, data) { |
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return new Promise((resolve, reject) => { |
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socket.write(data, (err) => { |
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if (err) { |
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reject(err) |
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} else { |
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resolve() |
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} |
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}) |
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}) |
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} |
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/** |
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* @param {net.Socket} client |
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* */ |
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async function handleClient(client) { |
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const rl = readline.createInterface({ input: client }) |
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for await (const line of rl) { |
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try { |
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const query = JSON.parse(line) |
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const results = [] |
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for (const input of query.formulas) { |
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const options = input.options ?? query.options ?? defaultOptions |
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try { |
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const html = katex.renderToString(input.tex, options) |
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results.push({ html }) |
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} catch (e) { |
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results.push({ error: String(e) }) |
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} |
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} |
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await socketWrite(client, JSON.stringify({ results }, null, query.debug ? ' ' : undefined)) |
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await socketWrite(client, '\n') |
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} catch (e) { |
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console.error(e) |
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await socketWrite(client, JSON.stringify({ error: String(e) })) |
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await socketWrite(client, '\n') |
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} |
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} |
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} |
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@ -0,0 +1,21 @@ |
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{ |
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"name": "ksp-katex-server", |
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"version": "1.0.0", |
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"lockfileVersion": 1, |
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"requires": true, |
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"dependencies": { |
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"commander": { |
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"version": "8.3.0", |
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"resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz", |
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"integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==" |
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}, |
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"katex": { |
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"version": "0.16.3", |
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"resolved": "https://registry.npmjs.org/katex/-/katex-0.16.3.tgz", |
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"integrity": "sha512-3EykQddareoRmbtNiNEDgl3IGjryyrp2eg/25fHDEnlHymIDi33bptkMv6K4EOC2LZCybLW/ZkEo6Le+EM9pmA==", |
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"requires": { |
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"commander": "^8.0.0" |
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} |
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} |
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} |
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} |
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{ |
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"name": "ksp-katex-server", |
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"version": "1.0.0", |
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"description": "", |
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"main": "index.mjs", |
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"scripts": { |
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"test": "echo \"Error: no test specified\" && exit 1" |
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}, |
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"author": "", |
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"license": "ISC", |
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"dependencies": { |
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"katex": "^0.16.3" |
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} |
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} |
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@ -0,0 +1,12 @@ |
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import socket |
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import subprocess |
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import tempfile |
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class KatexClient: |
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def __init__(self): |
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self._client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
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self._temp_dir = tempfile.TemporaryDirectory(prefix='formatitko') |
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socket_file = self._temp_dir.name + "/katex-socket" |
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self._client.bind(socket_file) |
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self._server = subprocess.Popen(["node", "./katex-server/index.mjs", socket_file]) |
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