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cli.js

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#!/usr/bin/env node
// Simple CLI for KaTeX.
// Reads TeX from stdin, outputs HTML to stdout.
// To run this from the repository, you must first build KaTeX by running
// `pnpm install` and `pnpm build`.
/* eslint no-console:0 */
let katex;
try {
katex = require("./");
} catch (e) {
console.error(
"KaTeX could not import, likely because dist/katex.js is missing.");
console.error("Please run 'pnpm install' and 'pnpm build' before running");
console.error("cli.js from the KaTeX repository.");
console.error();
throw e;
}
const {version} = require("./package.json");
const fs = require("fs");
const {program} = require("commander");
program.version(version);
for (const [prop, opt] of Object.entries(katex.SETTINGS_SCHEMA)) {
if (opt.cli !== false) {
program.option(opt.cli || "--" + prop, opt.cliDescription ||
opt.description, opt.cliProcessor, opt.cliDefault);
}
}
program.option("-f, --macro-file <path>",
"Read macro definitions, one per line, from the given file.")
.option("-i, --input <path>", "Read LaTeX input from the given file.")
.option("-o, --output <path>", "Write html output to the given file.");
let options;
function readMacros() {
if (options.macroFile) {
fs.readFile(options.macroFile, "utf-8", function(err, data) {
if (err) {throw err;}
splitMacros(data.toString().split('\n'));
});
} else {
splitMacros([]);
}
}
function splitMacros(macroStrings) {
// Override macros from macro file (if any)
// with macros from command line (if any)
macroStrings = macroStrings.concat(options.macro);
const macros = {};
for (const m of macroStrings) {
const i = m.search(":");
if (i !== -1) {
macros[m.substring(0, i).trim()] = m.substring(i + 1).trim();
}
}
options.macros = macros;
readInput();
}
function readInput() {
let input = "";
if (options.input) {
fs.readFile(options.input, "utf-8", function(err, data) {
if (err) {throw err;}
input = data.toString();
writeOutput(input);
});
} else {
process.stdin.on("data", function(chunk) {
input += chunk.toString();
});
process.stdin.on("end", function() {
writeOutput(input);
});
}
}
function writeOutput(input) {
// --format specifies the KaTeX output
const outputFile = options.output;
options.output = options.format;
const output = katex.renderToString(input, options) + "\n";
if (outputFile) {
fs.writeFile(outputFile, output, function(err) {
if (err) {
return console.log(err);
}
});
} else {
console.log(output);
}
}
if (require.main !== module) {
module.exports = program;
} else {
options = program.parse(process.argv).opts();
readMacros();
}
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