typeset/src/cmd.js

Typesetting for the web

#!/usr/bin/env node

const fs = require("fs");
const program = require("commander");
const typeset = require("./index.js");

// Convert comma-separated string into an array of strings
function parseCommaSeparatedString(val) {
  return val.split(",").map((s) => s.trim());
}

// Define the Command Line Interface (CLI) options
program
  .version(require("../package.json").version)
  .usage("[options] [<infile> [<outfile>]]")
  .option(
    "-i, --ignore <selectors>",
    "CSS selector(s) to ignore",
    parseCommaSeparatedString
  )
  .option(
    "-O, --only <selectors>",
    "CSS selector(s) to exclusively apply typeset to",
    parseCommaSeparatedString
  )
  .option(
    "--disable <features>",
    "Typeset feature(s) to disable (comma-separated)",
    parseCommaSeparatedString
  )
  .parse(process.argv);

const inputFile = program.args[0] || null;
const outputFile = program.args[1] || null;

const options = {
  ignore: program.ignore || "",
  only: program.only || "",
  disable: program.disable || [],
};

if (inputFile) {
  fs.readFile(inputFile, (err, data) => {
    if (err) throw err;

    const outputHTML = typeset(data, options);

    if (outputFile) {
      fs.writeFile(outputFile, outputHTML, (err) => {
        if (err) throw err;
        process.exit(0);
      });
    } else {
      // Print output to stdout by default
      console.log(outputHTML);
      process.exit(0);
    }
  });
}

process.stdin.resume();
process.stdin.setEncoding("utf8");

// Process input from stdin
process.stdin.on("data", (data) => {
  process.stdout.write(typeset(data, options));
});

process.stdin.on("end", () => {
  process.exit(0);
});