re #630 - optionally allows /updateassemblyinfofilename to be generated

Adds argument /ensureassemblyinfo, when specified and
/updateassemblyinfofilename is specified and does not exist we will
generate a template of the assembly info file containing only *Version
attributes in either cs, fs, vb allowing the version values to be replaced

Author: Philo

src/GitVersionCore/Extensions/ReadEmbeddedResourceExtensions.cs

@@ -0,0 +1,30 @@
+namespace GitVersionCore.Extensions
+{
+    using System.IO;
+
+    public static class ReadEmbeddedResourceExtensions
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="resourceName">Should include Namespace separated path to resource in assembly referenced by <typeparamref name="T"/></param>
+        /// <returns></returns>
+        public static string ReadAsStringFromEmbeddedResource<T>(this string resourceName)
+        {
+            using (var stream = resourceName.ReadFromEmbeddedResource<T>())
+            {
+                using (var rdr = new StreamReader(stream))
+                {
+                    return rdr.ReadToEnd();
+                }
+            }
+        }
+
+        public static Stream ReadFromEmbeddedResource<T>(this string resourceName)
+        {
+            var assembly = typeof(T).Assembly;
+            return assembly.GetManifestResourceStream(resourceName);
+        }
+    }
+}

src/GitVersionCore/GitVersionCore.csproj

@@ -109,6 +109,7 @@
     <Compile Include="Configuration\Init\StepResult.cs" />
     <Compile Include="EffectiveConfiguration.cs" />
     <Compile Include="ExecuteCore.cs" />
+    <Compile Include="Extensions\ReadEmbeddedResourceExtensions.cs" />
     <Compile Include="GitPreparer.cs" />
     <Compile Include="GitVersionCache.cs" />
     <Compile Include="Helpers\FileSystem.cs" />
@@ -121,6 +122,8 @@
     <Compile Include="SemanticVersionExtensions.cs" />
     <Compile Include="SemanticVersionFormatValues.cs" />
     <Compile Include="StringFormatWith.cs" />
+    <Compile Include="VersionAssemblyInfoResources\AssemblyVersionInfoTemplates.cs" />
+    <EmbeddedResource Include="VersionAssemblyInfoResources\VersionAssemblyInfo.cs" />
     <Compile Include="VersionCalculation\BaseVersionCalculator.cs" />
     <Compile Include="VersionCalculation\BaseVersionCalculators\BaseVersion.cs" />
     <Compile Include="VersionCalculation\BaseVersionCalculators\ConfigNextVersionBaseVersionStrategy.cs" />
@@ -161,6 +164,8 @@
     <Content Include="FodyWeavers.xml">
       <SubType>Designer</SubType>
     </Content>
+    <EmbeddedResource Include="VersionAssemblyInfoResources\VersionAssemblyInfo.vb" />
+    <EmbeddedResource Include="VersionAssemblyInfoResources\VersionAssemblyInfo.fs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="NugetAssets\GitVersion.nuspec">

src/GitVersionCore/VersionAssemblyInfoResources/AssemblyVersionInfoTemplates.cs

@@ -0,0 +1,38 @@
+namespace GitVersion.VersionAssemblyInfoResources
+{
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Linq;
+    using GitVersionCore.Extensions;
+
+    public class AssemblyVersionInfoTemplates
+    {
+        static IDictionary<string, FileInfo> assemblyInfoSourceList;
+
+        static AssemblyVersionInfoTemplates()
+        {
+            var enclosingNamespace = typeof(AssemblyVersionInfoTemplates).Namespace;
+
+            var files = typeof(AssemblyVersionInfoTemplates)
+                .Assembly
+                .GetManifestResourceNames()
+                .Where(n => n.StartsWith(enclosingNamespace ?? string.Empty)).Select(f => new FileInfo(f));
+
+            assemblyInfoSourceList = files.ToDictionary(k => k.Extension, v => v);
+        }
+
+        public static string GetAssemblyInfoTemplateFor(string assemblyInfoFile)
+        {
+            var fi = new FileInfo(assemblyInfoFile);
+            if (assemblyInfoSourceList.ContainsKey(fi.Extension))
+            {
+                var template = assemblyInfoSourceList[fi.Extension];
+                if (template != null)
+                {
+                    return template.Name.ReadAsStringFromEmbeddedResource<AssemblyVersionInfoTemplates>();
+                }
+            }
+            return null;
+        }
+    }
+}

src/GitVersionCore/VersionAssemblyInfoResources/VersionAssemblyInfo.cs

@@ -0,0 +1,13 @@
+//------------------------------------------------------------------------------ 
+// <auto-generated> 
+// This code was generated by GitVersion.
+// 
+// You can modify this code as we will not overwrite it when re-executing GitVersion
+// </auto-generated> 
+//------------------------------------------------------------------------------
+
+using System.Reflection;
+
+[assembly: AssemblyFileVersion("0.0.0.0")]
+[assembly: AssemblyVersion("0.0.0.0")]
+[assembly: AssemblyInformationalVersion("0.0.0.0")]

src/GitVersionCore/VersionAssemblyInfoResources/VersionAssemblyInfo.fs

@@ -0,0 +1,14 @@
+//------------------------------------------------------------------------------ 
+// <auto-generated> 
+// This code was generated by GitVersion. 
+// 
+// You can modify this code as we will not overwrite it when re-executing GitVersion
+// </auto-generated> 
+//------------------------------------------------------------------------------
+
+open System.Reflection
+
+[<assembly: AssemblyFileVersion("0.0.0.0")>]
+[<assembly: AssemblyVersion("0.0.0.0")>]
+[<assembly: AssemblyInformationalVersion("0.0.0.0")>]
+()

src/GitVersionCore/VersionAssemblyInfoResources/VersionAssemblyInfo.vb

@@ -0,0 +1,13 @@
+''------------------------------------------------------------------------------ 
+'' <auto-generated> 
+'' This code was generated by GitVersion. 
+'' 
+'' You can modify this code as we will not overwrite it when re-executing GitVersion
+'' </auto-generated> 
+''------------------------------------------------------------------------------
+
+Imports System.Reflection
+
+<assembly: AssemblyFileVersion("0.0.0.0")>
+<assembly: AssemblyVersion("0.0.0.0")>
+<assembly: AssemblyInformationalVersion("0.0.0.0")>

src/GitVersionExe.Tests/ArgumentParserTests.cs

@@ -205,6 +205,27 @@ public void update_assembly_info_with_relative_filename()
         arguments.UpdateAssemblyInfoFileName.ShouldBe("..\\..\\CommonAssemblyInfo.cs");
     }
 
+    [Test]
+    public void ensure_assembly_info_true_when_found()
+    {
+        var arguments = ArgumentParser.ParseArguments("-ensureAssemblyInfo");
+        arguments.EnsureAssemblyInfo.ShouldBe(true);
+    }
+
+    [Test]
+    public void ensure_assembly_info_true()
+    {
+        var arguments = ArgumentParser.ParseArguments("-ensureAssemblyInfo true");
+        arguments.EnsureAssemblyInfo.ShouldBe(true);
+    }
+
+    [Test]
+    public void ensure_assembly_info_false()
+    {
+        var arguments = ArgumentParser.ParseArguments("-ensureAssemblyInfo false");
+        arguments.EnsureAssemblyInfo.ShouldBe(false);
+    }
+
     [Test]
     public void dynamicRepoLocation()
     {