path: root/mcs/class/Microsoft.Build.Engine/Microsoft.Build.BuildEngine/ConsoleLogger.cs

//
// ConsoleLogger.cs: Outputs to the console
//
// Author:
//   Marek Sieradzki (marek.sieradzki@gmail.com)
// 
// (C) 2005 Marek Sieradzki
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

using System;
using System.Runtime.InteropServices;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security;
using System.Text;
using Microsoft.Build.Framework;

namespace Microsoft.Build.BuildEngine {
	public class ConsoleLogger : ILogger {
	
		string		parameters;
		int		indent;
		LoggerVerbosity	verbosity;
		WriteHandler	writeHandler;
		int		errorCount;
		int		warningCount;
		DateTime		buildStart;
		bool		performanceSummary;
		bool		showSummary;
		bool		skipProjectStartedText;
		List<string> errors, warnings;
		bool		projectFailed;
		ConsoleColor errorColor, warningColor, eventColor, messageColor, highMessageColor;
		ColorSetter colorSet;
		ColorResetter colorReset;
		IEventSource eventSource;
		bool no_message_color, use_colors;
		bool noItemAndPropertyList;

		List<BuildEvent> events;
		Dictionary<string, List<string>> errorsTable;
		Dictionary<string, List<string>> warningsTable;
		SortedDictionary<string, PerfInfo> targetPerfTable, tasksPerfTable;
		string current_events_string;
		
		public ConsoleLogger ()
			: this (LoggerVerbosity.Normal, null, null, null)
		{
		}

		public ConsoleLogger (LoggerVerbosity verbosity)
			: this (LoggerVerbosity.Normal, null, null, null)
		{
		}
		
		public ConsoleLogger (LoggerVerbosity verbosity,
				      WriteHandler write,
				      ColorSetter colorSet,
				      ColorResetter colorReset)
		{
			this.verbosity = verbosity;
			this.indent = 0;
			this.errorCount = 0;
			this.warningCount = 0;
			if (write == null)
				this.writeHandler += new WriteHandler (WriteHandlerFunction);
			else
				this.writeHandler += write;
			this.performanceSummary = false;
			this.showSummary = true;
			this.skipProjectStartedText = false;
			errors = new List<string> ();
			warnings = new List<string> ();
			this.colorSet = colorSet;
			this.colorReset = colorReset;

			events = new List<BuildEvent> ();
			errorsTable = new Dictionary<string, List<string>> ();
			warningsTable = new Dictionary<string, List<string>> ();
			targetPerfTable = new SortedDictionary<string, PerfInfo> ();
			tasksPerfTable = new SortedDictionary<string, PerfInfo> ();

			//defaults
			errorColor = ConsoleColor.DarkRed;
			warningColor = ConsoleColor.DarkYellow;
			eventColor = ConsoleColor.DarkCyan;
			messageColor = ConsoleColor.DarkGray;
			highMessageColor = ConsoleColor.White;

			// if message color is not set via the env var,
			// then don't use any color for it.
			no_message_color = true;

			use_colors = false;
			if (colorSet == null || colorReset == null)
				return;

			// color support
			string config = Environment.GetEnvironmentVariable ("XBUILD_COLORS");
			if (config == null) {
				use_colors = true;
				return;
			}

			if (config == "disable")
				return;

			use_colors = true;
			string [] pairs = config.Split (new char[] {','}, StringSplitOptions.RemoveEmptyEntries);
			foreach (string pair in pairs) {
				string [] parts = pair.Split (new char[] {'='}, StringSplitOptions.RemoveEmptyEntries);
				if (parts.Length != 2)
					continue;

				if (parts [0] == "errors")
					TryParseConsoleColor (parts [1], ref errorColor);
				else if (parts [0] == "warnings")
					TryParseConsoleColor (parts [1], ref warningColor);
				else if (parts [0] == "events")
					TryParseConsoleColor (parts [1], ref eventColor);
				else if (parts [0] == "messages") {
					if (TryParseConsoleColor (parts [1], ref messageColor)) {
						highMessageColor = GetBrightColorFor (messageColor);
						no_message_color = false;
					}
				}
			}
		}

		bool TryParseConsoleColor (string color_str, ref ConsoleColor color)
		{
			switch (color_str.ToLowerInvariant ()) {
			case "black": color = ConsoleColor.Black; break;

			case "blue": color = ConsoleColor.DarkBlue; break;
			case "green": color = ConsoleColor.DarkGreen; break;
			case "cyan": color = ConsoleColor.DarkCyan; break;
			case "red": color = ConsoleColor.DarkRed; break;
			case "magenta": color = ConsoleColor.DarkMagenta; break;
			case "yellow": color = ConsoleColor.DarkYellow; break;
			case "grey": color = ConsoleColor.DarkGray; break;

			case "brightgrey": color = ConsoleColor.Gray; break;
			case "brightblue": color = ConsoleColor.Blue; break;
			case "brightgreen": color = ConsoleColor.Green; break;
			case "brightcyan": color = ConsoleColor.Cyan; break;
			case "brightred": color = ConsoleColor.Red; break;
			case "brightmagenta": color = ConsoleColor.Magenta; break;
			case "brightyellow": color = ConsoleColor.Yellow; break;

			case "white":
			case "brightwhite": color = ConsoleColor.White; break;
			default: return false;
			}

			return true;
		}

		ConsoleColor GetBrightColorFor (ConsoleColor color)
		{
			switch (color) {
			case ConsoleColor.DarkBlue: return ConsoleColor.Blue;
			case ConsoleColor.DarkGreen: return ConsoleColor.Green;
			case ConsoleColor.DarkCyan: return ConsoleColor.Cyan;
			case ConsoleColor.DarkRed: return ConsoleColor.Red;
			case ConsoleColor.DarkMagenta: return ConsoleColor.Magenta;
			case ConsoleColor.DarkYellow: return ConsoleColor.Yellow;
			case ConsoleColor.DarkGray: return ConsoleColor.Gray;
			case ConsoleColor.Gray: return ConsoleColor.White;

			default: return color;
			}
		}
		
		public void ApplyParameter (string parameterName,
					    string parameterValue)
		{
			switch (parameterName) {
				case "PerformanceSummary":
					this.performanceSummary = true;
					break;
				case "Summary":
					this.showSummary = true;
					break;
				case "NoSummary":
					this.showSummary = false;
					break;
				case "NoItemAndPropertyList":
					this.noItemAndPropertyList = true;
					break;
				default:
					if (parameterName.StartsWith ("Verbosity="))
						ParseVerbosity (parameterName);
					break;
			}
		}

		void ParseVerbosity (string s)
		{
			string key, value;
			if (!TrySplitKeyValuePair (s, out key, out value))
				throw new LoggerException ("Unknown Verbosity, should be set as 'Verbosity=<verbosity>'");

			switch (value) {
			case "q":
			case "quiet":
				Verbosity = LoggerVerbosity.Quiet;
				break;
			case "m":
			case "minimal":
				Verbosity = LoggerVerbosity.Minimal;
				break;
			case "n":
			case "normal":
				Verbosity = LoggerVerbosity.Normal;
				break;
			case "d":
			case "detailed":
				Verbosity = LoggerVerbosity.Detailed;
				break;
			case "diag":
			case "diagnostic":
				Verbosity = LoggerVerbosity.Diagnostic;
				break;
			default:
				throw new LoggerException (String.Format ("Unknown verbosity - '{0}'", s));
			}
		}

		bool TrySplitKeyValuePair (string pair, out string key, out string value)
		{
			key = value = null;
			string[] parts = pair.Split ('=');
			if (parts.Length != 2)
				return false;

			key = parts [0];
			value = parts [1];
			return true;
		}

		public virtual void Initialize (IEventSource eventSource)
		{
			this.eventSource = eventSource;

			eventSource.BuildStarted += BuildStartedHandler;
			eventSource.BuildFinished += BuildFinishedHandler;

			eventSource.ProjectStarted += PushEvent;
			eventSource.ProjectFinished += PopEvent;

			eventSource.TargetStarted += PushEvent;
			eventSource.TargetFinished += PopEvent;

			eventSource.TaskStarted += PushEvent;
			eventSource.TaskFinished += PopEvent;

			eventSource.MessageRaised += MessageHandler;
			eventSource.WarningRaised += WarningHandler;
			eventSource.ErrorRaised += ErrorHandler;

			if (!String.IsNullOrEmpty (parameters))
				ParseParameters ();
		}

		public void BuildStartedHandler (object sender, BuildStartedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				WriteLine (String.Empty);
				WriteLine (String.Format ("Build started {0}.", args.Timestamp));
				WriteLine ("__________________________________________________");
			}
			buildStart = args.Timestamp;

			PushEvent (args);
		}
		
		public void BuildFinishedHandler (object sender, BuildFinishedEventArgs args)
		{
			BuildFinishedHandlerActual (args);

			// Reset
			events.Clear ();
			errorsTable.Clear ();
			warningsTable.Clear ();
			targetPerfTable.Clear ();
			tasksPerfTable.Clear ();
			errors.Clear ();
			warnings.Clear ();

			indent = 0;
			errorCount = 0;
			warningCount = 0;
			projectFailed = false;
		}

		void BuildFinishedHandlerActual (BuildFinishedEventArgs args)
		{
			if (!IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				PopEvent (args);
				return;
			}

			TimeSpan timeElapsed = args.Timestamp - buildStart;
			if (performanceSummary || verbosity == LoggerVerbosity.Diagnostic)
				DumpPerformanceSummary ();

			if (args.Succeeded == true && !projectFailed) {
				WriteLine ("Build succeeded.");
			} else {
				WriteLine ("Build FAILED.");
			}
			if (warnings.Count > 0) {
				WriteLine (Environment.NewLine + "Warnings:");
				SetColor (warningColor);

				WriteLine (String.Empty);
				foreach (KeyValuePair<string, List<string>> pair in warningsTable) {
					if (!String.IsNullOrEmpty (pair.Key))
						WriteLine (pair.Key);

					string indent_str = String.IsNullOrEmpty (pair.Key) ? String.Empty : "\t";
					foreach (string msg in pair.Value)
						WriteLine (String.Format ("{0}{1}", indent_str, msg));

					WriteLine (String.Empty);
				}

				ResetColor ();
			}

			if (errors.Count > 0) {
				WriteLine ("Errors:");
				SetColor (errorColor);

				WriteLine (String.Empty);
				foreach (KeyValuePair<string, List<string>> pair in errorsTable) {
					if (!String.IsNullOrEmpty (pair.Key))
						WriteLine (pair.Key);

					string indent_str = String.IsNullOrEmpty (pair.Key) ? String.Empty : "\t";
					foreach (string msg in pair.Value)
						WriteLine (String.Format ("{0}{1}", indent_str, msg));

					WriteLine (String.Empty);
				}
				ResetColor ();
			}

			if (showSummary == true){
				WriteLine (String.Format ("\t {0} Warning(s)", warningCount));
				WriteLine (String.Format ("\t {0} Error(s)", errorCount));
				WriteLine (String.Empty);
				WriteLine (String.Format ("Time Elapsed {0}", timeElapsed));
			}

			PopEvent (args);
		}

		public void ProjectStartedHandler (object sender, ProjectStartedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				SetColor (eventColor);
				WriteLine (String.Format ("Project \"{0}\" ({1} target(s)):", args.ProjectFile,
							String.IsNullOrEmpty (args.TargetNames) ? "default" : args.TargetNames));
				ResetColor ();
				DumpProperties (args.Properties);
				DumpItems (args.Items);
			}
		}
		
		public void ProjectFinishedHandler (object sender, ProjectFinishedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				if (indent == 1)
					indent --;
				SetColor (eventColor);
				WriteLine (String.Format ("Done building project \"{0}\".{1}", args.ProjectFile,
							args.Succeeded ? String.Empty : "-- FAILED"));
				ResetColor ();
				WriteLine (String.Empty);
			}
			if (!projectFailed)
				// no project has failed yet, so update the flag
				projectFailed = !args.Succeeded;
		}
		
		public void TargetStartedHandler (object sender, TargetStartedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				indent++;
				SetColor (eventColor);
				WriteLine (String.Empty);
				WriteLine (String.Format ("Target {0}:",args.TargetName));
				ResetColor ();
			}
		}
		
		public void TargetFinishedHandler (object sender, TargetFinishedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Detailed) ||
					(!args.Succeeded && IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal))) {
				SetColor (eventColor);
				WriteLine (String.Format ("Done building target \"{0}\" in project \"{1}\".{2}",
					args.TargetName, args.ProjectFile,
					args.Succeeded ? String.Empty : "-- FAILED"));
				ResetColor ();
				WriteLine (String.Empty);
			}
			indent--;
		}
		
		public void TaskStartedHandler (object sender, TaskStartedEventArgs args)
		{
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Detailed)) {
				SetColor (eventColor);
				WriteLine (String.Format ("Task \"{0}\"",args.TaskName));
				ResetColor ();
			}
			indent++;
		}
		
		public void TaskFinishedHandler (object sender, TaskFinishedEventArgs args)
		{
			indent--;
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Detailed) ||
					(!args.Succeeded && IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal))) {
				SetColor (eventColor);
				if (args.Succeeded)
					WriteLine (String.Format ("Done executing task \"{0}\"", args.TaskName));
				else
					WriteLine (String.Format ("Task \"{0}\" execution -- FAILED", args.TaskName));
				ResetColor ();
			}
		}
		
		public void MessageHandler (object sender, BuildMessageEventArgs args)
		{
			if (IsMessageOk (args)) {
				if (no_message_color) {
					ExecutePendingEventHandlers ();
					WriteLine (args.Message);
				} else {
					ExecutePendingEventHandlers ();
					SetColor (args.Importance == MessageImportance.High ? highMessageColor : messageColor);
					WriteLine (args.Message);
					ResetColor ();
				}
			}
		}
		
		public void WarningHandler (object sender, BuildWarningEventArgs args)
		{
			string msg = FormatWarningEvent (args);
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Quiet)) {
				ExecutePendingEventHandlers ();
				SetColor (warningColor);
				WriteLineWithoutIndent (msg);
				ResetColor ();
			}
			warnings.Add (msg);

			List<string> list = null;
			if (!warningsTable.TryGetValue (EventsAsString, out list))
				warningsTable [EventsAsString] = list = new List<string> ();
			list.Add (msg);

			warningCount++;
		}
		
		public void ErrorHandler (object sender, BuildErrorEventArgs args)
		{
			string msg = FormatErrorEvent (args);
			if (IsVerbosityGreaterOrEqual (LoggerVerbosity.Quiet)) {
				ExecutePendingEventHandlers ();
				SetColor (errorColor);
				WriteLineWithoutIndent (msg);
				ResetColor ();
			}
			errors.Add (msg);

			List<string> list = null;
			if (!errorsTable.TryGetValue (EventsAsString, out list))
				errorsTable [EventsAsString] = list = new List<string> ();
			list.Add (msg);
			errorCount++;
		}
		
		[MonoTODO]
		public void CustomEventHandler (object sender, CustomBuildEventArgs args)
		{
		}

		private void WriteLine (string message)
		{
			if (indent > 0) {
				StringBuilder sb = new StringBuilder ();
				for (int i = 0; i < indent; i++)
					sb.Append ('\t');

				string indent_str = sb.ToString ();

				foreach (string line in message.Split (new string[] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries))
					writeHandler (indent_str + line);
			} else {
				writeHandler (message);
			}
		}

		void PushEvent<T> (object sender, T args) where T: BuildStatusEventArgs
		{
			PushEvent (args);
		}

		void PushEvent<T> (T args) where T: BuildStatusEventArgs
		{
			BuildEvent be = new BuildEvent {
				EventArgs = args,
				StartHandlerHasExecuted = false,
				ConsoleLogger = this
			};

			events.Add (be);
			current_events_string = null;
		}

		void PopEvent<T> (object sender, T finished_args) where T: BuildStatusEventArgs
		{
			PopEvent (finished_args);
		}

		void PopEvent<T> (T finished_args) where T: BuildStatusEventArgs
		{
			if (events.Count == 0)
				throw new InvalidOperationException ("INTERNAL ERROR: Trying to pop from an empty events stack");

			BuildEvent be = events [events.Count - 1];
			if (performanceSummary || verbosity == LoggerVerbosity.Diagnostic) {
				var args = be.EventArgs;
				TargetStartedEventArgs tgt_args = args as TargetStartedEventArgs;
				if (tgt_args != null) {
					AddPerfInfo (tgt_args.TargetName, args.Timestamp, targetPerfTable);
				} else {
					TaskStartedEventArgs tsk_args = args as TaskStartedEventArgs;
					if (tsk_args != null)
						AddPerfInfo (tsk_args.TaskName, args.Timestamp, tasksPerfTable);
				}
			}

			be.ExecuteFinishedHandler (finished_args);
			events.RemoveAt (events.Count - 1);
			current_events_string = null;
		}

		void ExecutePendingEventHandlers ()
		{
			foreach (var be in events)
				be.ExecuteStartedHandler ();
		}

		string EventsToString ()
		{
			StringBuilder sb = new StringBuilder ();

			string last_imported_target_file = String.Empty;
			for (int i = 0; i < events.Count; i ++) {
				var args = events [i].EventArgs;
				ProjectStartedEventArgs pargs = args as ProjectStartedEventArgs;
				if (pargs != null) {
					sb.AppendFormat ("{0} ({1}) ->\n", pargs.ProjectFile,
							String.IsNullOrEmpty (pargs.TargetNames) ?
								"default targets" :
								pargs.TargetNames);
					last_imported_target_file = String.Empty;
					continue;
				}

				TargetStartedEventArgs targs = args as TargetStartedEventArgs;
				if (targs != null) {
					if (targs.TargetFile != targs.ProjectFile && targs.TargetFile != last_imported_target_file)
						// target from an imported file,
						// and it hasn't been mentioned as yet
						sb.AppendFormat ("{0} ", targs.TargetFile);

					last_imported_target_file = targs.TargetFile;
					sb.AppendFormat ("({0} target) ->\n", targs.TargetName);
				}
			}

			return sb.ToString ();
		}

		void AddPerfInfo (string name, DateTime start, IDictionary<string, PerfInfo> perf_table)
		{
			PerfInfo pi;
			if (!perf_table.TryGetValue (name, out pi)) {
				pi = new PerfInfo ();
				perf_table [name] = pi;
			}

			pi.Time += DateTime.Now - start;
			pi.NumberOfCalls ++;
		}

		void DumpPerformanceSummary ()
		{
			SetColor (eventColor);
			WriteLine ("Target perfomance summary:");
			ResetColor ();

			foreach (var pi in targetPerfTable.OrderBy (pair => pair.Value.Time))
				WriteLine (String.Format ("{0,10:0.000} ms  {1,-50}  {2,5} calls", pi.Value.Time.TotalMilliseconds, pi.Key, pi.Value.NumberOfCalls));

			WriteLine (String.Empty);

			SetColor (eventColor);
			WriteLine ("Tasks perfomance summary:");
			ResetColor ();

			foreach (var pi in tasksPerfTable.OrderBy (pair => pair.Value.Time))
				WriteLine (String.Format ("{0,10:0.000} ms  {1,-50}  {2,5} calls", pi.Value.Time.TotalMilliseconds, pi.Key, pi.Value.NumberOfCalls));

			WriteLine (String.Empty);
		}
		
		private void WriteLineWithoutIndent (string message)
		{
			writeHandler (message);
		}
		
		private void WriteHandlerFunction (string message)
		{
			Console.WriteLine (message);
		}

		void SetColor (ConsoleColor color)
		{
			if (use_colors)
				colorSet (color);
		}

		void ResetColor ()
		{
			if (use_colors)
				colorReset ();
		}
		
		private void ParseParameters ()
		{
			string[] splittedParameters = parameters.Split (';');
			foreach (string s in splittedParameters )
				ApplyParameter (s, null);
		}
		
		public virtual void Shutdown ()
		{
			if (eventSource == null)
				return;

			eventSource.BuildStarted -= BuildStartedHandler;
			eventSource.BuildFinished -= BuildFinishedHandler;

			eventSource.ProjectStarted -= PushEvent;
			eventSource.ProjectFinished -= PopEvent;

			eventSource.TargetStarted -= PushEvent;
			eventSource.TargetFinished -= PopEvent;

			eventSource.TaskStarted -= PushEvent;
			eventSource.TaskFinished -= PopEvent;

			eventSource.MessageRaised -= MessageHandler;
			eventSource.WarningRaised -= WarningHandler;
			eventSource.ErrorRaised -= ErrorHandler;
		}

		static bool InEmacs = Environment.GetEnvironmentVariable ("EMACS") == "t";
		
		private string FormatErrorEvent (BuildErrorEventArgs args)
		{
			// For some reason we get an 1-char empty string as Subcategory somtimes.
			string subprefix = args.Subcategory == null || args.Subcategory == "" || args.Subcategory == " " ? "" : " ";
			string subcat = subprefix == "" ? "" : args.Subcategory;
				
			if (args.LineNumber != 0){
				if (args.ColumnNumber != 0 && !InEmacs) 
					return String.Format ("{0}({1},{2}): {3}{4}error {5}: {6}",
							      args.File, args.LineNumber, args.ColumnNumber,
							      subprefix, subcat, args.Code, args.Message);

				return String.Format ("{0}({1}): {2}{3}error {4}: {5}",
						      args.File, args.LineNumber,
						      subprefix, subcat, args.Code, args.Message);
			} else {
				return String.Format ("{0}: {1}{2}error {3}: {4}", args.File, subprefix, subcat, args.Code,
					args.Message);
			}
		}

		private string FormatWarningEvent (BuildWarningEventArgs args)
		{
			// For some reason we get an 1-char empty string as Subcategory somtimes.
			string subprefix = args.Subcategory == null || args.Subcategory == "" || args.Subcategory == " " ? "" : " ";
			string subcat = subprefix == "" ? "" : args.Subcategory;

			// FIXME: show more complicated args
			if (args.LineNumber != 0){

				if (args.ColumnNumber != 0 && !InEmacs) {
					return String.Format ("{0}({1},{2}): {3}{4}warning {5}: {6}",
							      args.File, args.LineNumber, args.ColumnNumber,
							      subprefix, subcat, args.Code, args.Message);
				}
				return String.Format ("{0}({1}): {2}{3}warning {4}: {5}",
						      args.File, args.LineNumber,
						      subprefix, subcat, args.Code, args.Message);
			} else {
				return String.Format ("{0}: {1} warning {2}: {3}", args.File, args.Subcategory, args.Code,
					args.Message);
			}
		}
		
		private bool IsMessageOk (BuildMessageEventArgs bsea)
		{
			if (bsea.Importance == MessageImportance.High && IsVerbosityGreaterOrEqual (LoggerVerbosity.Minimal)) {
				return true;
			} else if (bsea.Importance == MessageImportance.Normal && IsVerbosityGreaterOrEqual (LoggerVerbosity.Normal)) {
				return true;
			} else if (bsea.Importance == MessageImportance.Low && IsVerbosityGreaterOrEqual (LoggerVerbosity.Detailed)) {
				return true;
			} else
				return false;
		}
		
                private bool IsVerbosityGreaterOrEqual (LoggerVerbosity v)
                {
                		if (v == LoggerVerbosity.Diagnostic) {
                			return LoggerVerbosity.Diagnostic <= verbosity;
                		} else if (v == LoggerVerbosity.Detailed) {
                			return LoggerVerbosity.Detailed <= verbosity;
                		} else if (v == LoggerVerbosity.Normal) {
                			return LoggerVerbosity.Normal <= verbosity;
                		} else if (v == LoggerVerbosity.Minimal) {
                			return LoggerVerbosity.Minimal <= verbosity;
                		} else if (v == LoggerVerbosity.Quiet) {
                			return true;
                		} else
                			return false;
                }

		void DumpProperties (IEnumerable properties)
		{
			if (noItemAndPropertyList || !IsVerbosityGreaterOrEqual (LoggerVerbosity.Diagnostic))
				return;

			SetColor (eventColor);
			WriteLine (String.Empty);
			WriteLine ("Initial Properties:");
			ResetColor ();

			if (properties == null)
				return;

			var dict = new SortedDictionary<string, string> ();
			foreach (DictionaryEntry de in properties)
				dict [(string)de.Key] = (string)de.Value;

			foreach (KeyValuePair<string, string> pair in dict)
				WriteLine (String.Format ("{0} = {1}", pair.Key, pair.Value));
		}

		void DumpItems (IEnumerable items)
		{
			if (noItemAndPropertyList || !IsVerbosityGreaterOrEqual (LoggerVerbosity.Diagnostic) || items == null)
				return;

			SetColor (eventColor);
			WriteLine (String.Empty);
			WriteLine ("Initial Items:");
			ResetColor ();
			if (items == null)
				return;

			var items_table = new SortedDictionary<string, List<ITaskItem>> ();
			foreach (DictionaryEntry de in items) {
				string key = (string)de.Key;
				if (!items_table.ContainsKey (key))
					items_table [key] = new List<ITaskItem> ();

				items_table [key].Add ((ITaskItem) de.Value);
			}

			foreach (string name in items_table.Keys) {
				WriteLine (name);
				indent ++;
				foreach (ITaskItem item in items_table [name])
					WriteLine (item.ItemSpec);
				indent--;
			}
		}

		public string Parameters {
			get {
				return parameters;
			}
			set {
				if (value == null)
					throw new ArgumentNullException ();
				parameters = value;
			}
		}

		string EventsAsString {
			get {
				if (current_events_string == null)
					current_events_string = EventsToString ();
				return current_events_string;
			}
		}
		
		public bool ShowSummary {
			get { return showSummary; }
			set { showSummary = value; }
		}
		
		public bool SkipProjectStartedText {
			get { return skipProjectStartedText; }
			set { skipProjectStartedText = value; }
		}

		public LoggerVerbosity Verbosity {
			get { return verbosity;	}
			set { verbosity = value; }
		}

		protected WriteHandler WriteHandler {
			get { return writeHandler; }
			set { writeHandler = value; }
		}
	}

	class BuildEvent {
		public BuildStatusEventArgs EventArgs;
		public bool StartHandlerHasExecuted;
		public ConsoleLogger ConsoleLogger;

		public void ExecuteStartedHandler ()
		{
			if (StartHandlerHasExecuted)
				return;

			if (EventArgs is ProjectStartedEventArgs)
				ConsoleLogger.ProjectStartedHandler (null, (ProjectStartedEventArgs)EventArgs);
			else if (EventArgs is TargetStartedEventArgs)
				ConsoleLogger.TargetStartedHandler (null, (TargetStartedEventArgs)EventArgs);
			else if (EventArgs is TaskStartedEventArgs)
				ConsoleLogger.TaskStartedHandler (null, (TaskStartedEventArgs)EventArgs);
			else if (!(EventArgs is BuildStartedEventArgs))
				throw new InvalidOperationException ("Unexpected event on the stack, type: " + EventArgs.GetType ());

			StartHandlerHasExecuted = true;
		}

		public void ExecuteFinishedHandler (BuildStatusEventArgs finished_args)
		{
			if (!StartHandlerHasExecuted)
				return;

			if (EventArgs is ProjectStartedEventArgs)
				ConsoleLogger.ProjectFinishedHandler (null, finished_args as ProjectFinishedEventArgs);
			else if (EventArgs is TargetStartedEventArgs)
				ConsoleLogger.TargetFinishedHandler (null, finished_args as TargetFinishedEventArgs);
			else if (EventArgs is TaskStartedEventArgs)
				ConsoleLogger.TaskFinishedHandler (null, finished_args as TaskFinishedEventArgs);
			else if (!(EventArgs is BuildStartedEventArgs))
				throw new InvalidOperationException ("Unexpected event on the stack, type: " + EventArgs.GetType ());
		}
	}

	class PerfInfo {
		public TimeSpan Time;
		public int NumberOfCalls;
	}
}