Gti status by node

git-status.js

#!/usr/bin/env node

var exec = require('child_process').exec

var Branch = new Promise(function(resolve, reject) {
  exec('git symbolic-ref -q HEAD | cut -c 12-', function (err, stdout) {
    if (err) return reject(err)
    if (stdout.length) return resolve(stdout.replace('\n', ''))
    exec('git rev-parse --short HEAD', function (err, stdout) {
      if (err) return reject(err)
      resolve(':' + stdout.replace(/\n$/, ''))
    })
  })
})

var Changed = new Promise(function(resolve, reject) {
  exec('git diff --name-status | cut -c 1-2', function (err, stdout) {
    if (err) return reject(err)
    var out = stdout.replace(/\n$/, '')
    var count = 0
    out.split('\n').forEach(function (line) {
      if (/U/.test(line)) return
      if (line.length) count++
    })
    resolve(count)
  })
})

var Staged = new Promise(function(resolve, reject) {
  exec('git diff --staged --name-status | cut -c 1-2', function (err, stdout) {
    if (err) return reject(err)
    var out = stdout.replace(/\n$/, '')
    var conflicted = 0
    var staged = 0
    out.split('\n').forEach(function (line) {
      if (!line.length) return
      if (/U/.test(line)) {
        conflicted++
      } else {
        staged++
      }
    })
    resolve([conflicted, staged])
  })
})

var Untracked = new Promise(function(resolve, reject) {
  exec('git ls-files --others --exclude-standard', function (err, stdout) {
    if (err) return reject(err)
    var out = stdout.replace(/\n$/, '')
    if (!out.length) return resolve(0)
    resolve(stdout.split('\n').length)
  })
})

Promise.all([Branch, Changed, Staged, Untracked]).then(function (arr) {
  var branch = '  ' + arr[0]
  var changed = arr[1]
  var conflicted = arr[2][0]
  var staged = arr[2][1]
  var untracked = arr[3]
  if (changed + conflicted + staged + untracked === 0) {
    process.stdout.write(branch + ' ✓')
  } else {
    var res = ''
    if (changed) res =  res + '+'
    if (conflicted) res =  res + 'x'
    if (staged) res =  res + '●'
    if (untracked) res = res + '…'
    process.stdout.write(branch + ' ' + res)
  }
}, function () { })