module.exports = function(hljs) {
  return {
    aliases: ['patch'],
    contains: [
      {
        className: 'chunk',
        relevance: 10,
        variants: [
          {begin: /^@@ +\-\d+,\d+ +\+\d+,\d+ +@@$/},
          {begin: /^\*\*\* +\d+,\d+ +\*\*\*\*$/},
          {begin: /^\-\-\- +\d+,\d+ +\-\-\-\-$/}
        ]
      },
      {
        className: 'header',
        variants: [
          {begin: /Index: /, end: /$/},
          {begin: /=====/, end: /=====$/},
          {begin: /^\-\-\-/, end: /$/},
          {begin: /^\*{3} /, end: /$/},
          {begin: /^\+\+\+/, end: /$/},
          {begin: /\*{5}/, end: /\*{5}$/}
        ]
      },
      {
        className: 'addition',
        begin: '^\\+', end: '$'
      },
      {
        className: 'deletion',
        begin: '^\\-', end: '$'
      },
      {
        className: 'change',
        begin: '^\\!', end: '$'
      }
    ]
  };
};