WIP : We get translated variable.

compile-pug.js

+const path = require('path')
+const fs = require('fs').promises
+const objectAssignDeep = require(`object-assign-deep`)
+const yaml = require('js-yaml')
+const pug = require('pug')
+const chokidar = require('chokidar')
+
+const default_lang = 'en'
+
+const pugFile = './src/index.pug'
+const dataDir = './translation'
+const outDir = './www'
+
+async function compile() {
+  const langs = (await fs.readdir(dataDir))
+    .filter(f => path.extname(f) === '.yml')
+    .map(f => path.basename(f, '.yml'))
+
+  const langData = {}
+
+  await Promise.all(
+    langs.map(lang =>
+      fs
+        .readFile(`${dataDir}/${lang}.yml`, 'utf8')
+        .then(text => (langData[lang] = yaml.safeLoad(text))),
+    ),
+  )
+
+  for (const lang in langData) {
+    if (lang === default_lang) continue
+    langData[lang] = objectAssignDeep(
+      {},
+      langData[default_lang],
+      langData[lang],
+    )
+  }
+
+  const options = JSON.parse(await fs.readFile('./src/config.json', 'utf-8'))
+  const pugFct = pug.compileFile(pugFile)
+
+  await fs.mkdir(outDir, { recursive: true })
+
+  await Promise.all(
+    Object.entries(langData).map(([lang, data]) => {
+      options.lang=lang
+      options.data=data
+
+      const html = pugFct(options)
+      const filename = `${outDir}/index-${lang}.html`
+      console.log(`write ${filename}`)
+      return fs.writeFile(filename, html)
+    }),
+  )
+}
+
+compile().then(() => {
+  if (!process.argv.includes('-w') && !process.argv.includes('--watch')) return
+  console.log('watching for changes…')
+  chokidar.watch([pugFile, dataDir]).on('change', editedFilePath => {
+    console.log(`\nchanged: ${editedFilePath}`)
+    compile()
+  })
+})

translation/en.yml

+---
+title: My amazing website
+welcome: Hi! welcome to our website
+contact: click here to contact us
+email: contact@example.com
\ No newline at end of file

translation/fr.yml

+---
+title: Mon superbe site
+welcome: Bonjour ! bienvenu sur notre site
+contact: cliquez ici pour nous contacter
\ No newline at end of file