git-info-loader.js

git-info-loader.js

/* eslint-env node */
'use strict'

const Bluebird = require('bluebird')
const childProcess = require('child_process')

function gitCommand (args) {
  return new Promise((resolve, reject) => {
    childProcess.execFile('git', args, (err, stdout, stderr) => {
      if (!err) {
        resolve(stdout.trim())
      } else {
        reject(err)
      }
    })
  })
}

function gitInfo (format) {
  return gitCommand(['show', '--no-patch', `--pretty=${format}`])
}

module.exports = function () {
  this.cacheable && this.cacheable()
  const callback = this.async()

  Bluebird.props({
    commit: gitInfo('%H'),
    describe: gitCommand(['describe']),
    author: gitInfo('%aN'),
    authorDate: gitInfo('%ad'),
    committer: gitInfo('%cN'),
    committerDate: gitInfo('%cd')
  })
  .then((info) => callback(null, `module.exports = ${JSON.stringify(info, null, 2)};`))
  .catch((err) => callback(err))
}