build.tasks

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