First chunk of .net based buildsystem

.gitignore

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+
+_ReSharper.bs
+bin/
+bs.5.1.ReSharper.user
+bs.suo
+obj/

DependencyGraph.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace bs
+{
+	public class DependencyGraph
+	{
+		readonly Dictionary<string, TargetBuildInstructions> graph = new Dictionary<string, TargetBuildInstructions>();
+		public Action<string, TargetBuildInstructions> GenerateCallback = (s, i) => { };
+
+		public void RequestTarget(string targetFile)
+		{
+			var instructions = graph[targetFile];
+
+			if (instructions.SourceFiles.Any(sourceFile => !File.Exists(sourceFile)))
+				throw new MissingDependencyException();
+
+			if (File.Exists(targetFile))
+				return;
+
+			Generate(targetFile, instructions);
+		}
+
+		private void Generate(string targetFile, TargetBuildInstructions instructions)
+		{
+			GenerateCallback(targetFile, instructions);
+			instructions.Action(targetFile, instructions.SourceFiles);
+		}
+
+		public void RegisterTarget(string targetFile, TargetBuildInstructions instructions)
+		{
+			graph.Add(targetFile,instructions);
+		}
+	}
+
+	public class TargetBuildInstructions
+	{
+		public Action<string, IEnumerable<string>> Action;
+		public IEnumerable<string> SourceFiles;
+	}
+}

FileAssert.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using NUnit.Framework;
+
+namespace bs
+{
+	static class FileAssert
+	{
+		static public void Contains(string file, string contents)
+		{
+			Assert.AreEqual(contents, File.ReadAllText(file));
+		}
+	}
+}

MissingDependencyException.cs

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+using System;
+
+namespace bs
+{
+	public class MissingDependencyException : Exception
+	{
+	}
+}

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace bs
+{
+	class Program
+	{
+		static void Main(string[] args)
+		{
+		}
+	}
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("bs")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("Microsoft")]
+[assembly: AssemblyProduct("bs")]
+[assembly: AssemblyCopyright("Copyright © Microsoft 2012")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("6386c065-bd18-4d1d-add2-ef06f124fc5d")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Tests/DependencyGraphTests.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using NUnit.Framework;
+
+namespace bs.Tests
+{
+	[TestFixture]
+	public class DependencyGraphTests
+	{
+		[SetUp]
+		public void Setup()
+		{
+			const string dirName = "Workspace";
+			if (Directory.Exists(dirName))
+				Directory.Delete(dirName,true);
+
+			Directory.CreateDirectory(dirName);
+			Directory.SetCurrentDirectory(dirName);
+		}
+
+		const string defaultSourceFile = "input.txt";
+		const string defaulttargetFile = "output.txt";
+
+		[Test]
+		public void WillGenerateTargetWithoutSources()
+		{
+			DependencyGraph depGraph = SetupGraphWithOneTargetWithoutSources();
+
+			depGraph.RequestTarget(defaulttargetFile);
+			FileAssert.Contains(defaulttargetFile, "Hello");
+		}
+
+		[Test]
+		public void WontGenerateTargetWithoutSourcesTwice()
+		{
+			DependencyGraph depGraph = SetupGraphWithOneTargetWithoutSources();
+
+			depGraph.RequestTarget(defaulttargetFile);
+			FileAssert.Contains(defaulttargetFile, "Hello");
+			depGraph.GenerateCallback += (target, instructions) => { throw new InvalidOperationException(); };
+			depGraph.RequestTarget(defaulttargetFile);
+		}
+
+		private static DependencyGraph SetupGraphWithOneTargetWithoutSources()
+		{
+			var depGraph = new DependencyGraph();
+			depGraph.RegisterTarget(defaulttargetFile, new TargetBuildInstructions()
+			                                           	{
+			                                           		Action = (target,sources) => File.WriteAllText(target, "Hello"),
+			                                           		SourceFiles = new string[0],
+			                                           	});
+			return depGraph;
+		}
+
+
+		[Test]
+		public void ThrowsIfDependencyDoesNotExist()
+		{
+			DependencyGraph depGraph = SetupSimpleCopyDepGraph();
+			Assert.Throws<MissingDependencyException>(() => depGraph.RequestTarget(defaulttargetFile));
+		}
+
+		[Test]
+		public void RegeneratesWhenSourceChanges()
+		{
+			DependencyGraph depGraph = SetupSimpleCopyDepGraph();
+			Assert.Throws<MissingDependencyException>(() => depGraph.RequestTarget(defaulttargetFile));
+
+			File.WriteAllText(defaultSourceFile, "One");
+			depGraph.RequestTarget(defaulttargetFile);
+			FileAssert.Contains(defaultSourceFile, "One");
+
+			File.WriteAllText(defaultSourceFile, "Two");
+			depGraph.RequestTarget(defaulttargetFile);
+			FileAssert.Contains(defaultSourceFile, "Two");
+		}
+
+		private static DependencyGraph SetupSimpleCopyDepGraph()
+		{
+			var depGraph = new DependencyGraph();
+
+			depGraph.RegisterTarget(defaulttargetFile, new TargetBuildInstructions()
+			                                           	{
+			                                           		Action = (target,sources) => File.Copy(sources.Single(), target, true),
+			                                           		SourceFiles = new[] { defaultSourceFile }
+			                                           	});
+			return depGraph;
+		}
+	}
+}

bs.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+    <ProductVersion>8.0.30703</ProductVersion>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{F2546F61-0181-4E7D-AD26-5F20F9D2F888}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>bs</RootNamespace>
+    <AssemblyName>bs</AssemblyName>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile>Client</TargetFrameworkProfile>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+    <PlatformTarget>x86</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="nunit.framework, Version=2.5.10.11092, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="FileAssert.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Tests\DependencyGraphTests.cs" />
+    <Compile Include="DependencyGraph.cs" />
+    <Compile Include="MissingDependencyException.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

bs.sln

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+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "bs", "bs.csproj", "{F2546F61-0181-4E7D-AD26-5F20F9D2F888}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F2546F61-0181-4E7D-AD26-5F20F9D2F888}.Debug|x86.ActiveCfg = Debug|x86
+		{F2546F61-0181-4E7D-AD26-5F20F9D2F888}.Debug|x86.Build.0 = Debug|x86
+		{F2546F61-0181-4E7D-AD26-5F20F9D2F888}.Release|x86.ActiveCfg = Release|x86
+		{F2546F61-0181-4E7D-AD26-5F20F9D2F888}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal