Support AssemblyInformationalVersion on nuget version generation

Author: programcsharp

Build/build.proj

@@ -46,24 +46,31 @@
     <GetAssemblyIdentity AssemblyFiles="$(PackageDir)\Griddly.Core\lib\net45\Griddly.Mvc.dll">
       <Output TaskParameter="Assemblies" ItemName="AsmInfo" />
     </GetAssemblyIdentity>
+    <GetAssemblyInformationalVersion AssemblyFile="$(PackageDir)\Griddly.Core\lib\net45\Griddly.Mvc.dll">
+      <Output TaskParameter="Value" ItemName="AssemblyVersion" />
+    </GetAssemblyInformationalVersion>
+    <PropertyGroup>
+      <AssemblyVersion Condition="@(AssemblyVersion) != ''">@(AssemblyVersion)</AssemblyVersion>
+      <AssemblyVersion Condition="$(AssemblyVersion) == ''">%(AsmInfo.Version)</AssemblyVersion>
+    </PropertyGroup>
 
     <!-- insert the version number into the nuspec files -->
     <XmlUpdate
       Namespace="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd"
       XmlFileName="$(PackageDir)\Griddly\Griddly.nuspec"
       XPath="/package/metadata/version"
-      Value="%(AsmInfo.Version)" />
+      Value="$(AssemblyVersion)" />
     <XmlUpdate
       Namespace="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd"
       XmlFileName="$(PackageDir)\Griddly.Core\Griddly.Core.nuspec"
       XPath="/package/metadata/version"
-      Value="%(AsmInfo.Version)" />
+      Value="$(AssemblyVersion)" />
 
     <XmlUpdate
       Namespace="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd"
       XmlFileName="$(PackageDir)\Griddly\Griddly.nuspec"
       XPath="/package/metadata/dependencies/group/dependency[@id='Griddly.Core']/@version"
-      Value="%(AsmInfo.Version)" />
+      Value="$(AssemblyVersion)" />
 
     <Exec WorkingDirectory="$(PackageDir)" 
           Command="$(BaseDir)\.nuget\nuget.exe pack $(PackageDir)\Griddly\Griddly.nuspec" />
@@ -76,4 +83,26 @@
 
     <Copy SourceFiles="@(OutputPackages)" DestinationFolder="$(PackageDir)"/>
   </Target>
+
+  <UsingTask TaskName="GetAssemblyInformationalVersion" TaskFactory="CodeTaskFactory"
+      AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
+    <ParameterGroup>
+      <AssemblyFile ParameterType="System.String" Required="true" />
+      <Value ParameterType="System.String" Output="true" />
+    </ParameterGroup>
+    <Task>
+      <Reference Include="System.Core" />
+      <Using Namespace="System" />
+      <Using Namespace="System.IO" />
+      <Using Namespace="System.Diagnostics" />
+      <Using Namespace="System.Reflection" />
+      <Code Type="Fragment" Language="cs">
+        <![CDATA[
+            var attr = Attribute.GetCustomAttribute(Assembly.LoadFile(Path.GetFullPath(AssemblyFile)), typeof(AssemblyInformationalVersionAttribute)) as AssemblyInformationalVersionAttribute;
+            
+            Value = attr != null ? attr.InformationalVersion : null;
+        ]]>
+      </Code>
+    </Task>
+  </UsingTask>
 </Project>