bows/bows.js

Rainbowed console logs for chrome, opera and firefox in development.

(function() {
  function checkColorSupport() {
    if (typeof window === 'undefined' || typeof navigator === 'undefined') {
      return false;
    }

    var chrome = !!window.chrome,
      firefox = /firefox/i.test(navigator.userAgent),
      firefoxVersion,
      electron = process && process.versions && process.versions.electron;

    if (firefox) {
      var match = navigator.userAgent.match(/Firefox\/(\d+\.\d+)/);
      if (match && match[1] && Number(match[1])) {
        firefoxVersion = Number(match[1]);
      }
    }
    return chrome || firefoxVersion >= 31.0 || electron;
  }

  function getLocalStorageSafely() {
    var localStorage;
    try {
      localStorage = window.localStorage;
    } catch (e) {
      // failed: access to localStorage is denied
    }
    return localStorage;
  }

  var yieldColor = function() {
    var goldenRatio = 0.618033988749895;
    hue += goldenRatio;
    hue = hue % 1;
    return hue * 360;
  };

  var inNode = typeof window === 'undefined',
    ls = !inNode && getLocalStorageSafely(),
    debugKey = ls && ls.andlogKey ? ls.andlogKey : 'debug',
    debug = ls && ls[debugKey] ? ls[debugKey] : false,
    logger = require('andlog'),
    bind = Function.prototype.bind,
    hue = 0,
    padding = true,
    separator = '|',
    padLength = 15,
    noop = function() {},
    // if ls.debugColors is set, use that, otherwise check for support
    colorsSupported =
      ls && ls.debugColors ? ls.debugColors !== 'false' : checkColorSupport(),
    bows = null,
    debugRegex = null,
    invertRegex = false,
    moduleColorsMap = {};

  if (debug && debug[0] === '!' && debug[1] === '/') {
    invertRegex = true;
    debug = debug.slice(1);
  }
  debugRegex =
    debug &&
    debug[0] === '/' &&
    new RegExp(debug.substring(1, debug.length - 1));

  var logLevels = ['log', 'debug', 'warn', 'error', 'info'];

  //Noop should noop
  for (var i = 0, ii = logLevels.length; i < ii; i++) {
    noop[logLevels[i]] = noop;
  }

  bows = function(str) {
    // If localStorage is not available just don't log
    if (!ls) return noop;

    var msg, colorString, logfn;

    if (padding) {
      msg = str.slice(0, padLength);
      msg += Array(padLength + 3 - msg.length).join(' ') + separator;
    } else {
      msg = str + Array(3).join(' ') + separator;
    }

    if (debugRegex) {
      var matches = str.match(debugRegex);
      if ((!invertRegex && !matches) || (invertRegex && matches)) return noop;
    }

    if (!bind) return noop;

    var logArgs = [logger];
    if (colorsSupported) {
      if (!moduleColorsMap[str]) {
        moduleColorsMap[str] = yieldColor();
      }
      var color = moduleColorsMap[str];
      msg = '%c' + msg;
      colorString = 'color: hsl(' + color + ',99%,40%); font-weight: bold';

      logArgs.push(msg, colorString);
    } else {
      logArgs.push(msg);
    }

    if (arguments.length > 1) {
      var args = Array.prototype.slice.call(arguments, 1);
      logArgs = logArgs.concat(args);
    }

    logfn = bind.apply(logger.log, logArgs);

    logLevels.forEach(function(f) {
      logfn[f] = bind.apply(logger[f] || logfn, logArgs);
    });
    return logfn;
  };

  bows.config = function(config) {
    if (config.padLength) {
      padLength = config.padLength;
    }

    if (typeof config.padding === 'boolean') {
      padding = config.padding;
    }

    if (config.separator) {
      separator = config.separator;
    } else if (config.separator === false || config.separator === '') {
      separator = '';
    }
  };

  if (typeof module !== 'undefined') {
    module.exports = bows;
  } else {
    window.bows = bows;
  }
}.call());