import chokidar from 'chokidar' import fs from 'fs' import path from 'path' import { promisify } from 'util' import { buildSass } from './build-sass' import { buildInlineScript } from './build-inline-script' import { buildSvg } from './build-svg' import now from 'performance-now' import debounce from 'lodash-es/debounce' const writeFile = promisify(fs.writeFile) const DEBOUNCE = 500 const builders = [ { watch: 'src/scss', comment: '', rebuild: buildSass }, { watch: 'src/inline-script/inline-script.js', comment: '', rebuild: buildInlineScript }, { watch: 'src/bin/svgs.js', comment: '', rebuild: buildSvg } ] // array of strings and builder functions, we build this on-the-fly const partials = buildPartials() function buildPartials () { let rawTemplate = fs.readFileSync(path.resolve(__dirname, '../src/build/template.html'), 'utf8') let partials = [rawTemplate] builders.forEach(builder => { for (let i = 0; i < partials.length; i++) { let partial = partials[i] if (typeof partial !== 'string') { continue } let idx = partial.indexOf(builder.comment) if (idx !== -1) { partials.splice( i, 1, partial.substring(0, idx), builder, partial.substring(idx + builder.comment.length) ) break } } }) return partials } function doWatch () { // rebuild each of the partials on-the-fly if something changes partials.forEach(partial => { if (typeof partial === 'string') { return } chokidar.watch(partial.watch).on('change', debounce(path => { console.log(`Detected change in ${path}...`) delete partial.result buildAll() }), DEBOUNCE) }) } async function buildAll () { let start = now() let html = (await Promise.all(partials.map(async partial => { if (typeof partial === 'string') { return partial } if (!partial.result) { partial.result = partial.comment + '\n' + (await partial.rebuild()) } return partial.result }))).join('') await writeFile(path.resolve(__dirname, '../src/template.html'), html, 'utf8') let end = now() console.log(`Built template.html in ${(end - start).toFixed(2)}ms`) } async function main () { if (process.argv.includes('--watch')) { doWatch() } else { await buildAll() } } main().catch(err => { console.error(err) process.exit(1) })