use branch specific git ignore configs

post-commit.js

#!/usr/bin/env node

var execSync = require('child_process').execSync;

var exec = function (command) {  
  return execSync(command, { pwd: '../../', encoding: 'utf8' });
};

// get current branch name as single value
var currentBranch = exec('git rev-parse --abbrev-ref HEAD').trim();

// branches with specific ignore files
var branchGitignores = exec('ls .gitignores').trim().split('\n');

// remove previous exclude file or symlink
exec('rm .git/info/exclude');

if (branchGitignores.indexOf(currentBranch) !== -1) {  
  exec(`ln -s ../../.gitignores/${currentBranch} .git/info/exclude`);
} else {
  exec('ln -s ../../.gitignores/default .git/info/exclude');
}