Build.tasks

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <!--Inline Task: FindNuGet-->
  <UsingTask TaskName="FindNuGet" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <Result ParameterType="System.String" Output="true" />
    </ParameterGroup>
    <Task>
      <Using Namespace="System" />
      <Using Namespace="System.IO" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
        try {
            // Look for NuGet on the path
            String pathVariable = Environment.GetEnvironmentVariable("Path", EnvironmentVariableTarget.Machine);

            Log.LogMessage("Looking for NuGet.exe in the local environment...");
            if (pathVariable != null) {
                foreach (String path in pathVariable.Split(';')) {
                    if (File.Exists(Path.Combine(path, "nuget.exe"))) {
                        Result = path.EndsWith("\\") ? path : path + "\\";
                        Log.LogMessage("Found NuGet.exe in {0}", path);
                        return true;
                    }
                }
            }

            Log.LogMessage("No success.");
            return false;            
        } catch (Exception e) {
            Log.LogErrorFromException(e);
            return false;
        }
        ]]>
      </Code>
    </Task>
  </UsingTask>

  <!--Inline Task: DownloadNuGet-->
  <UsingTask TaskName="DownloadNuGet" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <OutputFile ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Reference Include="System.Core" />
      <Using Namespace="System" />
      <Using Namespace="System.IO" />
      <Using Namespace="System.Net" />
      <Using Namespace="Microsoft.Build.Framework" />
      <Using Namespace="Microsoft.Build.Utilities" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
        try {
            OutputFile = Path.GetFullPath(OutputFile);

            Log.LogMessage("Downloading NuGet.exe from NuGet.org...");
            WebClient webClient = new WebClient();
            webClient.DownloadFile("https://www.nuget.org/nuget.exe", OutputFile);
            Log.LogMessage("Download complete.");

            return true;
        } catch (Exception e) {
            Log.LogErrorFromException(e);
            return false;
        }
        ]]>
      </Code>
    </Task>
  </UsingTask>

</Project>