MSBuild target for automatic update AssemblyInfo.cs.

AutoVersionFromGit.prop

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <UsingTask TaskName="RegexTransform" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <InputFile ParameterType="System.String" Required="true" />
      <OutputFile ParameterType="System.String" Required="true" />
      <Items ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" />
    </ParameterGroup>
    <Task>
      <Using Namespace="System.IO" />
      <Using Namespace="System.Text.RegularExpressions" />
      <Using Namespace="Microsoft.Build.Framework" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[         
          if(!File.Exists(InputFile)) {
            Log.LogError(null, null, null, null, 0, 0, 0, 0, String.Format("Could not find version file: {0}", InputFile), new object[0]);
          }
          string content = File.ReadAllText(InputFile);
          foreach(ITaskItem item in Items) {
            string find = item.GetMetadata("Find");
            string replaceWith = item.GetMetadata("ReplaceWith");
            content = Regex.Replace(content, find, replaceWith);
          }
          File.WriteAllText(OutputFile, content);
          ]]>
      </Code>
    </Task>
  </UsingTask>

  <Target Name="CreateDir" BeforeTargets="UpdateAssemblyVersion">
	<MakeDir Directories="$(IntermediateOutputPath)"/>
  </Target>

  <Target Name="UpdateAssemblyVersion" AfterTargets="BeforeBuild">
    <Exec Command="git describe --tags --long --match v[0-9]*.[0-9]* --dirty" ConsoleToMSBuild="true" ContinueOnError="true"
          StandardErrorImportance="low" StandardOutputImportance="low">
      <Output TaskParameter="ConsoleOutput" PropertyName="GitDescribe" />
      <Output TaskParameter="ExitCode" PropertyName="GitDescribeExitCode"/>
    </Exec>
    <Warning Condition=" '$(GitDescribeExitCode)' != '0' " Text="Can't get version from git!" />
    
    <PropertyGroup Condition=" '$(GitDescribeExitCode)' != '0' ">
      <Version>2.0.*</Version>
      <InformationalVersion>2.0 (unknown git revision)</InformationalVersion>
    </PropertyGroup>
    
    <PropertyGroup Condition=" '$(GitDescribeExitCode)' == '0' ">
      <GitParse>$([System.Text.RegularExpressions.Regex]::Match($(GitDescribe), `v(\d+\.\d+)(.*)-(\d+)-g([0-9a-z]+)-?(.*)`).Groups)</GitParse>
      <GitBaseVer>$(GitParse.Split(';')[1])</GitBaseVer>
      <GitRevision>$(GitParse.Split(';')[3])</GitRevision>
      <GitHash>$(GitParse.Split(';')[4])</GitHash>
      <GitDirty>$(GitParse.Split(';')[5])</GitDirty>
      <Version>$(GitBaseVer).$(GitRevision).*</Version>
      <InformationalVersion Condition=" '$(GitDirty)' == '' ">$(GitBaseVer).$(GitRevision)</InformationalVersion>
      <InformationalVersion Condition=" '$(GitDirty)' != '' ">$(GitBaseVer).$(GitRevision) beta</InformationalVersion>
    </PropertyGroup>

    <Message Text="Version: $(Version)" Importance="high" />
    <Message Text="InformationalVersion: $(InformationalVersion)" Importance="high" />

    <ItemGroup>
      <Regex Include="Version">
        <Find>#version</Find>
        <ReplaceWith>$(Version)</ReplaceWith>
      </Regex>
      <Regex Include="InformationalVersion">
        <Find>#infoversion</Find>
        <ReplaceWith>$(InformationalVersion)</ReplaceWith>
      </Regex>
      <Regex Include="Date">
        <Find>#date</Find>
        <ReplaceWith>$([System.DateTime]::Now)</ReplaceWith>
      </Regex>
      <Regex Include="Year">
        <Find>#year</Find>
        <ReplaceWith>$([System.DateTime]::Now.Year)</ReplaceWith>
      </Regex>
      <Regex Include="Config">
        <Find>#config</Find>
        <ReplaceWith>$(Configuration)</ReplaceWith>
      </Regex>
      <Regex Include="Hash">
        <Find>#hash</Find>
        <ReplaceWith>$(GitHash)</ReplaceWith>
      </Regex>
    </ItemGroup>
    
    <RegexTransform InputFile="$(MSBuildThisFileDirectory)\CommonAssemblyInfo.cs" OutputFile="$(IntermediateOutputPath)\TempCommonAssemblyInfo.cs" Items="@(Regex)" />
    <ItemGroup>
      <Compile Include="$(IntermediateOutputPath)\TempCommonAssemblyInfo.cs" />
    </ItemGroup>
  </Target>

</Project>