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Inline

  <UsingTask TaskName="GetLatestGitTagVersionTask" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll" >
    <ParameterGroup>
      <Major ParameterType="System.Int32" Output="True"/>
      <Minor ParameterType="System.Int32" Output="True"/>
      <Build ParameterType="System.Int32" Output="True"/>
      <Revision ParameterType="System.Int32" Output="True"/>
      <ShortVersionStr ParameterType="System.String" Output="True"/>
      <LongVersionStr ParameterType="System.String" Output="True"/>
    </ParameterGroup>
    <Task>
      <Reference Include="mscorlib" />
      <Using Namespace="System" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
            var version = new Version(0, 0);
            var di = new DirectoryInfo(@".git\refs\tags\");
            foreach (var tag in di.GetFiles())
            {
                Version v;
                if (Version.TryParse(tag.Name, out v))
                {
                    if (version < v) version = v;
                }
            }
            Major = version.Major;
            Minor = version.Minor;
            Build = version.Build >= 0 ? version.Build : 0;
            Revision = version.Revision >= 0 ? version.Revision : 0;
            ShortVersionStr = version.ToString();
            version = new Version(Major, Minor, Build, Revision);
            LongVersionStr = version.ToString();
        ]]>
      </Code>
    </Task>
  </UsingTask>

Using it

  <Target Name="GetTagVersion" BeforeTargets="Clean;Prepare;Build;Test">
    <GetLatestGitTagVersionTask>
      <Output PropertyName="MajorVersion" TaskParameter="Major" />
      <Output PropertyName="MinorVersion" TaskParameter="Minor" />
      <Output PropertyName="PatchVersion" TaskParameter="Build" />
      <Output PropertyName="RevisionVersion" TaskParameter="Revision" />
      <Output PropertyName="ShortBuildVersion" TaskParameter="ShortVersionStr" />
      <Output PropertyName="BuildVersion" TaskParameter="LongVersionStr" />
    </GetLatestGitTagVersionTask>
    <Message Text="Compose Version: $(MajorVersion).$(MinorVersion).$(PatchVersion).$(RevisionVersion)" Importance="High"/>
    <Message Text="Short Version:   $(ShortBuildVersion)" Importance="High"/>
    <Message Text="Build Version:   $(BuildVersion)" Importance="High"/>
  </Target>