code: function (infos, fileColors, lineColors) {
  
          return {
              msg       : '[' + applyColors(infos.filename, fileColors) + ':' +
                                applyColors(infos.line, lineColors) + ']',
              msgLength : (infos.filename + "" +
                              infos.line).length + 3
          };
      }
docs: buildFileInfos
  
  @param {Object}                  infos
  @param {String} infos.filename
  @param {String} infos.line
  
  @param {String|Array} fileColors Optional colors.
  @param {String|Array} lineColors Optional colors.
  
  @return {Object}
  @return {String} msg             File infos with colors if given
  @return {int}    msgLength