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+// This is the **logger** module for *Karma*. It uses
+// [log4js](https://github.com/nomiddlename/log4js-node) to handle and
+// configure all logging that happens inside of *Karma*.
+
+// ### Helpers and Setup
+
+var log4js = require('log4js')
+var helper = require('./helper')
+var constant = require('./constants')
+
+// Special Wrapper for Socket.io :(
+var LogWrapper = function (name, level) {
+  this.logger = log4js.getLogger(name)
+  this.logger.setLevel(level)
+}
+var levels = ['error', 'warn', 'info', 'debug']
+
+levels.forEach(function (level) {
+  LogWrapper.prototype[level] = function () {
+    this.logger[level].apply(this.logger, arguments)
+  }
+})
+
+// #### Public Functions
+
+// Setup the logger by passing in the configuration options. It needs
+// three argumentes:
+//
+//     setup(logLevel, colors, appenders)
+//
+// * `logLevel`: *String* Defines the global log level.
+// * `colors`: *Boolean* Use colors in the stdout or not.
+// * `appenders`: *Array* This will be passed as appenders to log4js
+//   to allow for fine grained configuration of log4js. For more information
+//   see https://github.com/nomiddlename/log4js-node.
+var setup = function (level, colors, appenders) {
+  // Turn color on/off on the console appenders with pattern layout
+  var pattern = colors ? constant.COLOR_PATTERN : constant.NO_COLOR_PATTERN
+
+  // If there are no appenders use the default one
+  appenders = helper.isDefined(appenders) ? appenders : [constant.CONSOLE_APPENDER]
+
+  appenders = appenders.map(function (appender) {
+    if (appender.type === 'console') {
+      if (helper.isDefined(appender.layout) && appender.layout.type === 'pattern') {
+        appender.layout.pattern = pattern
+      }
+    }
+    return appender
+  })
+
+  // Pass the values to log4js
+  log4js.setGlobalLogLevel(level)
+  log4js.configure({
+    appenders: appenders
+  })
+}
+
+// Create a new logger. There are two optional arguments
+// * `name`, which defaults to `karma` and
+//   If the `name = 'socket.io'` this will create a special wrapper
+//   to be used as a logger for socket.io.
+// * `level`, which defaults to the global level.
+var create = function (name, level) {
+  if (name === 'socket.io') {
+    return new LogWrapper('socket.io', level)
+  } else {
+    var logger = log4js.getLogger(name || 'karma')
+    if (helper.isDefined(level)) {
+      logger.setLevel(level)
+    }
+    return logger
+  }
+}
+
+// #### Publish
+
+exports.create = create
+exports.setup = setup