Only include web.$(Configuration).config where xxxx exists on disk. Fixes #67 (#68)

* Only include web.xxxx.config for configurations, where xxxx exists on disk. Fixes #67

* Adjust plurality of itemgroup names, and add additional exists checks.

Author: CZEMacLeod

global.json

@@ -6,7 +6,7 @@
   },
     "msbuild-sdks": {
         "Microsoft.Build.NoTargets": "2.0.1",
-        "MSBuild.SDK.SystemWeb": "4.0.82",
-        "MSBuild.SDK.SystemWeb.RazorLibrary": "4.0.82"
+        "MSBuild.SDK.SystemWeb": "4.0.88",
+        "MSBuild.SDK.SystemWeb.RazorLibrary": "4.0.88"
     }
 }

src/MSBuild.SDK.SystemWeb/Sdk/MSBuild.SDK.SystemWeb.DefaultItems.props

@@ -8,12 +8,22 @@
 
   <ItemGroup Condition="'$(EnableWebFormsDefaultItems)'=='true'">
     <Content Include="Web.config" />
-    <_WebConfigConfigurations Include="$(Configurations)" />
-    <None Include="@(_WebConfigConfigurations->'Web.%(Identity).config')">
-      <DependentUpon>Web.config</DependentUpon>
-    </None>
+    <!-- web.*.config where * is a Configuration type (used for transforms) fixes #67 -->
+    <_WebConfigConfiguration Include="$(Configurations)" Exclude="@ExcludeWebConfigConfiguration">
+      <Configuration>%(Identity)</Configuration>
+    </_WebConfigConfiguration>
+    <_WebConfigConfigurationFile Include="@(_WebConfigConfiguration->'Web.%(Identity).config')" >
+      <DependentUpon Condition="EXISTS('Web.config')">Web.config</DependentUpon>
+      <CurrentConfiguration>false</CurrentConfiguration>
+      <CurrentConfiguration Condition="'$(Configuration)'=='%(Configuration)'">true</CurrentConfiguration>
+      <!-- The following could be extended to allow applying transforms based on the configuration in a hierarchical way. See notes in PR #68 -->
+      <!--<ApplyConfiguration>false</ApplyConfiguration>
+      <ApplyConfiguration Condition="'$(Configuration)'=='%(Configuration)'">true</ApplyConfiguration>
+      <ApplyConfiguration Condition="$(Configuration.StartsWith('%(Configuration).'))">true</ApplyConfiguration>-->
+    </_WebConfigConfigurationFile>
+    <None Include="@(_WebConfigConfigurationFile->Exists())" />
     <None Include="Web.BindingRedirects.config" Condition="EXISTS('Web.BindingRedirects.config')">
-      <DependentUpon>Web.config</DependentUpon>
+      <DependentUpon Condition="EXISTS('Web.config')">Web.config</DependentUpon>
     </None>
 
     <!-- Altered web.*.config inclusion so these items will be in the WebDeploy Package