#!/usr/bin/env node
'use strict';

const fs = require('fs-extra');
const path = require('path');

// Update theme names list in codemirror-editing-hook.js
async function getThemes() {
  const p = path.join(__dirname, '..', 'vendor/codemirror/theme/');
  const files = await fs.readdir(p);
  return files
    .filter(name => name.endsWith('.css'))
    .map(name => name.replace('.css', ''))
    .sort();
}

function replaceThemes(content, themes) {
  const list = JSON.stringify(themes, null, 8).replace(/"/g, '\'');
  return content.replace(
    /\/\*\s*populate-theme-start\s*\*\/[\s\S]+\/\*\s*populate-theme-end\s*\*\//,
    // strip off square brackets & first 8 spaces
    `/* populate-theme-start*/\n${list.substring(2, list.length - 2)}\n        /* populate-theme-end */`
  );
}

async function updateHook(themes) {
  const fileName = path.join(__dirname, '..', 'edit/codemirror-editing-hooks.js');
  const content = await fs.readFile(fileName, 'utf-8');
  fs.writeFile(fileName, replaceThemes(content, themes));
}

function exit(err) {
  if (err) console.error(err);
  process.exit(err ? 1 : 0);
}

getThemes()
  .then(themes => updateHook(themes))
  .then(() => console.log('\x1b[32m%s\x1b[0m', `codemirror themes list updated`))
  .catch(exit);