Frontend automation with git hooks and npm

copy-hooks.js

var path = require('path');
// we need to require fs.extra because node's fs module doesn not have copy
// method.
// We could create our own, but this works as well.
var fs = require('fs.extra');

var appRoot = path.resolve(__dirname);

// 2 arguments are needed, one for determining hook type
// and other one for source file name
if (process.argv.length < 4) {
  throw new Error('Please provide hook type and source file name.');
}

var hookType = process.argv[2];
var hookSourceName = process.argv[3];

// desired file in .git/hooks (hook type)
var targetPath = path.resolve(appRoot + '/../.git/hooks/' + hookType);
// file in which actual source is stored and that's being copied from
var sourcePath = path.resolve(appRoot + '/hooks/' + hookSourceName);

if (fs.existsSync(targetPath)) {
  // if desired hook type exists, do nothing.
  // we don't want to overwrite anything blindly...
  console.log('Target file already exists, please complete hooking by hand');
} else {
  if (!fs.existsSync(sourcePath)) {
    // handle missing filename case in util/hooks
    throw new Error('No target hook in utils folder...');
  } else {
    // copy the file
    fs.copy(sourcePath, targetPath, function() {
      console.log('Hook copy complete.')
      // and set it's permissions to executable.
      fs.chmodSync(targetPath, 0777);
    });
  }
}

package-scripts.json

// scripts section
"scripts": {
    "start": "npm install && bower install && npm run-script copyHooks && gulp",
    "copyHooks": "node ./util/copy-hooks.js post-checkout post-checkout && node ./util/copy-hooks.js post-merge post-checkout"
  },

post-checkout

#! /bin/sh

npm install && bower install