Capture msbuild tf.exe changeset /latest - tfs

Question

Within an MSBuild file I would like to extract the changeset number from the output of the following command into a $(parameter) value;
<Exec Command="c:\path\tf.exe changeset /latest /i" />
In my build script I can see the Changeset number in the first line of the result:
Changeset: 7539
User: John Doe
Date: 23 September 2015 17:03:19
Comment:
some check-in comment
Items:
[[List of items here]]
Work Items:
[[List of linked work items here]]
I feel like I am very close and want the simplest solution. I can use MSBuild.ExtensionPack or the MSBuild.Community tasks if there is a better option.

Answer 1

To only get the changeset number, please try the following steps: (code is quoted from this link):
Download and install MSBuildExtensionPack on the machine
Add the following code to the .csproj file (assume you're working with a C# project). Note that: you need to change the folder path where MSBuild.ExtensionPack.TaskFactory.PowerShell.dll is installed on your machine for the AssemblyFile property.
<UsingTask TaskFactory="PowershellTaskFactory" TaskName="Changeset" AssemblyFile="C:\Program Files\MSBuild\ExtensionPack\4.0\MSBuild.ExtensionPack.TaskFactory.PowerShell.dll">
<ParameterGroup>
<changeset Output="true" />
</ParameterGroup>
<Task>
<![CDATA[
$tf = & "C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\tf.exe" history . /r /noprompt /stopafter:1 /version:W
$changeset=$tf[2].Split(" ")[0]
]]>
</Task>
</UsingTask>
<Target Name="TestBuild">
<Changeset>
<Output TaskParameter="changeset" PropertyName="changeset" />
</Changeset>
<Message Importance="High" Text="Changeset:++++++ ::::: $(changeset)" />
</Target>

Answer 2

You can use some new standard MsBuild features to achieve this.
<PropertyGroup>
<TF>"$(VS140COMNTOOLS)..\IDE\tf.exe"</TF>
</PropertyGroup>
<Target Name="GetVersion">
<Exec Command="$(TF) changeset /latest /i" ConsoleToMSBuild="true">
<Output TaskParameter="ConsoleOutput" PropertyName="TfOutput" />
</Exec>
<PropertyGroup>
<Changeset>$(TfOutput.Split(';')[0].Substring(11))</Changeset>
</PropertyGroup>
<Message Importance="high" Text="ChangeSet is $(Changeset)" />
</Target>