pinafore/bin/build-template-html.js

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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 = [
{
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watch: 'src/scss',
comment: '<!-- inline CSS -->',
rebuild: buildSass
},
{
watch: 'inline-script.js',
comment: '<!-- inline JS -->',
rebuild: buildInlineScript
},
{
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watch: 'src/bin/svgs.js',
comment: '<!-- inline SVG -->',
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)
})