material-icons-subset/index.js

#### Creates a new font with a subset of icons from [Material Design Icons Webfont](https://materialdesignicons.com/)

#!/usr/bin/env node
const webfont = require('webfont').default
const { writeFileSync, readdirSync } = require('fs')
const { dirname, join, resolve } = require('path')
const { major, minor, patch } = require('@mdi/svg/font-build.json').version

if (process.argv.length === 2) {
  console.error('Error: Expected a path for a fontconfig.json file or a list of the name of icons')
  process.exit(1)
}
let userConfig = { icons: [] }
if (process.argv[2].endsWith('.json')) {
  userConfig = require(resolve(process.argv[2]))
} else {
  userConfig.icons = process.argv.slice(2)
}

const MIS = 'material-icons-subset'
if (!userConfig.icons) {
  if (userConfig[MIS] && userConfig[MIS].icons) userConfig = userConfig[MIS]
  else if (userConfig.extra) {
    if (userConfig.extra.icons) userConfig = userConfig.extra
    if (userConfig.extra[MIS] && userConfig.extra[MIS].icons) userConfig = userConfig.extra[MIS]
  }
  if (userConfig.icons.length === 0) {
    console.error(
      'Error: The config.json must have a "icon" property with an array of the name of icons'
    )
    process.exit(1)
  }
}

const config = {
  formats: ['ttf'],
  fontName: 'Material Design Icons',
  fontFile: 'materialicons-subset',
  dest: '.',
  ...userConfig,
}

const glyphDir = join(dirname(require.resolve('@mdi/svg/package.json')), 'svg')
const dirFiles = new Set(readdirSync(glyphDir))

const glyphMap = {}
const paths = [...new Set(config.icons)].sort().map((icon, i) => {
  glyphMap[icon] = 59905 + i
  const iconName = `${icon}.svg`
  if (!dirFiles.has(iconName)) {
    console.warn('Skipping', iconName)
  }
  return join(glyphDir, iconName).replace(/\\/g, '/')
})

webfont({
  files: paths,
  fontName: config.fontName,
  formats: config.formats,
  fontHeight: 512,
  descent: 64,
  version: `${major}.${minor}.${patch}`,
})
  .then((result) => {
    config.formats.forEach((format) => {
      writeFileSync(
        join(process.cwd(), config.dest, `${config.fontFile}-subset.${format}`),
        result[format]
      )
    })
    writeFileSync(
      join(process.cwd(), config.dest, `${config.fontFile}-subset.json`),
      JSON.stringify(glyphMap)
    )
    console.log(`Generated ${config.formats}`)
    return result
  })
  .catch((error) => {
    console.error(error)
    throw error
  })