Prepare-commit-msg hook for github + Pivotal Tracker Integration

prepare-commit-msg

#!/usr/bin/env node

/*
 * Author: Samar Acharya <samar@techgaun.com>
 * Place it in .git/hooks and chmod +x .git/hooks/prepare-commit-msg
 * Based on http://www.ipreferjim.com/2013/04/git-prepare-commit-msg-with-node-js/
 */

var exec = require('child_process').exec,
    util = require('util'),
    fs = require('fs'),
    contents = null,
    branch;
if(/COMMIT_EDITMSG/g.test(process.argv[2])){
    //get current branch name
    branch = exec("git rev-parse --abbrev-ref HEAD",
      function (err, stdout, stderr) {
        if(err){
            process.exit(0);
        }

        contents = fs.readFileSync(process.argv[2]);
         
        var name = stdout.replace('* ','').replace('\n','');
        if (name === 'Production') {
            process.exit(0);
        } 
        if(name !== '(no branch)'){
            //use regex to identify if commit msg already has PT ID(s)
            strContents = contents.toString('utf8');
            if (strContents.search(/\[*#[0-9]{8}(.*#[0-9]{8})*\]/) != -1) {
                process.exit(0);
            }
            contents = util.format('[#%s] %s', name, contents); 
            // write contents back out to .git/COMMIT_EDITMSG
            fs.writeFileSync(process.argv[2], contents);
            process.exit(0);
        } else {
            process.exit(0);
        }
    });
}