polygerrit-ui/app/behaviors/gr-path-list-behavior/gr-path-list-behavior.html

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you may not use this file except in compliance with the License.
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<script>
(function(window) {
  'use strict';

  /** @polymerBehavior Gerrit.PathListBehavior */
  var PathListBehavior = {
    specialFilePathCompare: function(a, b) {
      var COMMIT_MESSAGE_PATH = '/COMMIT_MSG';
      // The commit message always goes first.
      if (a === COMMIT_MESSAGE_PATH) {
        return -1;
      }
      if (b === COMMIT_MESSAGE_PATH) {
        return 1;
      }

      var aLastDotIndex = a.lastIndexOf('.');
      var aExt = a.substr(aLastDotIndex + 1);
      var aFile = a.substr(0, aLastDotIndex) || a;

      var bLastDotIndex = b.lastIndexOf('.');
      var bExt = b.substr(bLastDotIndex + 1);
      var bFile = b.substr(0, bLastDotIndex) || b;

      // Sort header files above others with the same base name.
      var headerExts = ['h', 'hxx', 'hpp'];
      if (aFile.length > 0 && aFile === bFile) {
        if (headerExts.indexOf(aExt) !== -1 &&
            headerExts.indexOf(bExt) !== -1) {
          return a.localeCompare(b);
        }
        if (headerExts.indexOf(aExt) !== -1) {
          return -1;
        }
        if (headerExts.indexOf(bExt) !== -1) {
          return 1;
        }
      }
      return aFile.localeCompare(bFile) || a.localeCompare(b);
    },
  };

  window.Gerrit = window.Gerrit || {};
  window.Gerrit.PathListBehavior = PathListBehavior;
})(window);
</script>