old_contents: #!/usr/bin/env node
  
  /**
   * Git COMMIT-MSG hook for validating commit message
   * See https://docs.google.com/document/d/1rk04jEuGfk9kYzfqCuOlPTSJw3hEDZJTBN5E5f1SALo/edit
   *
   * Installation:
   * >> cd <angular-repo>
   * >> ln -s validate-commit-msg.js .git/hooks/commit-msg
   */
  var fs = require('fs');
  var util = require('util');
  
  
  var MAX_LENGTH = 70;
  var PATTERN = /^(?:fixup!\s*)?(\w*)(\(([\w\$\.\-\*/]*)\))?\: (.*)$/;
  var IGNORED = /^WIP\:/;
  var TYPES = {
    feat: true,
    fix: true,
    docs: true,
    style: true,
    refactor: true,
    test: true,
    chore: true,
    revert: true
  };
  
  
  var error = function() {
    // gitx does not display it
    // http://gitx.lighthouseapp.com/projects/17830/tickets/294-feature-display-hook-error-message-when-hook-fails
    // https://groups.google.com/group/gitx/browse_thread/thread/a03bcab60844b812
    console.error('INVALID COMMIT MSG: ' + util.format.apply(null, arguments));
  };
  
  
  var validateMessage = function(message) {
    var isValid = true;
  
    if (IGNORED.test(message)) {
      console.log('Commit message validation ignored.');
      return true;
    }
  
    if (message.length > MAX_LENGTH) {
      error('is longer than %d characters !', MAX_LENGTH);
      isValid = false;
    }
  
    var match = PATTERN.exec(message);
  
    if (!match) {
      error('does not match "<type>(<scope>): <subject>" ! was: ' + message);
      return false;
    }
  
    var type = match[1];
    var scope = match[3];
    var subject = match[4];
  
    if (!TYPES.hasOwnProperty(type)) {
      error('"%s" is not allowed type !', type);
      return false;
    }
  
    // Some more ideas, do want anything like this ?
    // - allow only specific scopes (eg. fix(docs) should not be allowed ?
    // - auto correct the type to lower case ?
    // - auto correct first letter of the subject to lower case ?
    // - auto add empty line after subject ?
    // - auto remove empty () ?
    // - auto correct typos in type ?
    // - store incorrect messages, so that we can learn
  
    return isValid;
  };
  
  
  var firstLineFromBuffer = function(buffer) {
    return buffer.toString().split('\n').shift();
  };
  
  
  
  // publish for testing
  exports.validateMessage = validateMessage;
  
  // hacky start if not run by jasmine :-D
  if (process.argv.join('').indexOf('jasmine-node') === -1) {
    var commitMsgFile = process.argv[2];
    var incorrectLogFile = commitMsgFile.replace('COMMIT_EDITMSG', 'logs/incorrect-commit-msgs');
  
    fs.readFile(commitMsgFile, function(err, buffer) {
      var msg = firstLineFromBuffer(buffer);
  
      if (!validateMessage(msg)) {
        fs.appendFile(incorrectLogFile, msg + '\n', function() {
          process.exit(1);
        });
      } else {
        process.exit(0);
      }
    });
  }
  
new_contents: #!/usr/bin/env node
  
  /**
   * Git COMMIT-MSG hook for validating commit message
   * See https://docs.google.com/document/d/1rk04jEuGfk9kYzfqCuOlPTSJw3hEDZJTBN5E5f1SALo/edit
   *
   * Installation:
   * >> cd <angular-repo>
   * >> ln -s ../../validate-commit-msg.js .git/hooks/commit-msg
   */
  var fs = require('fs');
  var util = require('util');
  
  
  var MAX_LENGTH = 70;
  var PATTERN = /^(?:fixup!\s*)?(\w*)(\(([\w\$\.\-\*/]*)\))?\: (.*)$/;
  var IGNORED = /^WIP\:/;
  var TYPES = {
    feat: true,
    fix: true,
    docs: true,
    style: true,
    refactor: true,
    test: true,
    chore: true,
    revert: true
  };
  
  
  var error = function() {
    // gitx does not display it
    // http://gitx.lighthouseapp.com/projects/17830/tickets/294-feature-display-hook-error-message-when-hook-fails
    // https://groups.google.com/group/gitx/browse_thread/thread/a03bcab60844b812
    console.error('INVALID COMMIT MSG: ' + util.format.apply(null, arguments));
  };
  
  
  var validateMessage = function(message) {
    var isValid = true;
  
    if (IGNORED.test(message)) {
      console.log('Commit message validation ignored.');
      return true;
    }
  
    if (message.length > MAX_LENGTH) {
      error('is longer than %d characters !', MAX_LENGTH);
      isValid = false;
    }
  
    var match = PATTERN.exec(message);
  
    if (!match) {
      error('does not match "<type>(<scope>): <subject>" ! was: ' + message);
      return false;
    }
  
    var type = match[1];
    var scope = match[3];
    var subject = match[4];
  
    if (!TYPES.hasOwnProperty(type)) {
      error('"%s" is not allowed type !', type);
      return false;
    }
  
    // Some more ideas, do want anything like this ?
    // - allow only specific scopes (eg. fix(docs) should not be allowed ?
    // - auto correct the type to lower case ?
    // - auto correct first letter of the subject to lower case ?
    // - auto add empty line after subject ?
    // - auto remove empty () ?
    // - auto correct typos in type ?
    // - store incorrect messages, so that we can learn
  
    return isValid;
  };
  
  
  var firstLineFromBuffer = function(buffer) {
    return buffer.toString().split('\n').shift();
  };
  
  
  
  // publish for testing
  exports.validateMessage = validateMessage;
  
  // hacky start if not run by jasmine :-D
  if (process.argv.join('').indexOf('jasmine-node') === -1) {
    var commitMsgFile = process.argv[2];
    var incorrectLogFile = commitMsgFile.replace('COMMIT_EDITMSG', 'logs/incorrect-commit-msgs');
  
    fs.readFile(commitMsgFile, function(err, buffer) {
      var msg = firstLineFromBuffer(buffer);
  
      if (!validateMessage(msg)) {
        fs.appendFile(incorrectLogFile, msg + '\n', function() {
          process.exit(1);
        });
      } else {
        process.exit(0);
      }
    });
  }
  
subject: fix incorrect comment