Refactor approach so it works better

We can't really detect the top-level programs first, because by that point, Roslyn already knows about the multiple files containing them and will show error squiglies in the IDE which are quite disconcerting when things actually do compile fine later on.

So instead, we collect all top-level C# files (that is, not within a subfolder) and assume those will be the top-level programs. We add them all as launch profiles, and then before compile we remove all the Compile items which don't match the active debug profile selected. This works much better, even if intellisense is only on for the file which is selected in the dropdown, even if it's not the active one in the editor. Making both match will likely require IDE extensibility, so it's out of scope (for now?).

Author: kzu

.gitignore

@@ -8,12 +8,10 @@ obj
 *.lock.json
 *.nuget.props
 *.nuget.targets
+dotnet-nugetize.items
 *.suo
 *.user
 *.cache
 *.log
 *.binlog
-*.rsp
-/src/Usage
-/src/Backup
-/src/TestResults
+*.rsp

README.md

@@ -0,0 +1,33 @@
+![Icon](img/icon-32.png) SmallSharp
+============
+
+Create, edit and run multiple C# 9.0 top-level programs 
+in the same project by just selecting the startup program from the start 
+button!
+
+![Icon](img/launchSettings.png)
+
+[![Version](https://img.shields.io/nuget/v/SmallSharp.svg?color=royalblue)](https://www.nuget.org/packages/SmallSharp)
+[![Downloads](https://img.shields.io/nuget/dt/SmallSharp.svg?color=green)](https://www.nuget.org/packages/SmallSharp)
+[![License](https://img.shields.io/github/license/kzu/SmallSharp.svg?color=blue)](https://github.com//kzu/SmallSharp/blob/main/LICENSE)
+[![Build](https://github.com/kzu/SmallSharp/workflows/build/badge.svg?branch=main)](https://github.com/kzu/SmallSharp/actions)
+
+The new C# 9 [top-level programs](https://devblogs.microsoft.com/dotnet/welcome-to-c-9-0/#top-level-programs) allow a very intuitive, simple and streamlined experience for quickly spiking or learning C#. 
+
+> As of Visual Studio 16.8 Preview, you need to turn on this feature by adding this property to your project file: 
+
+```xml
+<LangVersion>Preview</LangVersion>
+```
+
+
+One missing thing in its current incarnation in Visual Studio 16.8 is that you can only have one such top-level programs in a project. This means that in order to prototype or learn a different area of .NET, you'd be forced to either replace your previous top-level program or change it to be a non-compile item somehow so you can keep it around (i.e. rename to a `.txt`).
+
+**SmallSharp** brings that very feature by automatically generating a launch profile for each `.cs` file at the project level:
+
+
+This list is automatically kept in sync as you add more `.cs` files to the project. When you select one target C# file, that becomes the only top-level program to be compiled, so you don't have to modify any of the others since they automatically become *None* items.
+
+All compile files directly under the project directory root are considered top-level programs for selection and compilation purposes. If you need to share code among them, you can place them in subdirectories and those will behave like normal compile items.
+
+![Demo](img/SmallSharp.gif)

SmallSharp.sln

@@ -19,8 +19,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{
 		.github\workflows\release.yml = .github\workflows\release.yml
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSharp.Build", "src\SmallSharp.Build\SmallSharp.Build.csproj", "{011AD1CC-2613-42D7-9BEF-0872F6409325}"
-EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -31,10 +29,6 @@ Global
 		{F87C7A13-669C-4F18-9266-B256F254DFA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F87C7A13-669C-4F18-9266-B256F254DFA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F87C7A13-669C-4F18-9266-B256F254DFA3}.Release|Any CPU.Build.0 = Release|Any CPU
-		{011AD1CC-2613-42D7-9BEF-0872F6409325}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{011AD1CC-2613-42D7-9BEF-0872F6409325}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{011AD1CC-2613-42D7-9BEF-0872F6409325}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{011AD1CC-2613-42D7-9BEF-0872F6409325}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

img/SmallSharp.gif

@@ -24,15 +24,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <!--<None Update="@(None)" Pack="true" CopyToOutputDirectory="PreserveNewest" />-->
     <_PackageFiles Include="$(MSBuildThisFileDirectory)_._" PackagePath="lib/netstandard2.0/_._" />
-
-    <!--<EmbeddedResource Include="@(None -&gt; WithMetadataValue('Extension', '.sbntxt'))" />-->
-    
-    <!--<_PackageFiles Include="@(None -&gt; WithMetadataValue('Extension', '.sbntxt'))" PackagePath="$(BuildOutputTargetFolder)/$(TargetFramework)/%(Filename)%(Extension)" />-->
-    <!--<_PackageFiles Include="*.props" PackagePath="build/$(TargetFramework)" />
-    <_PackageFiles Include="*.targets" PackagePath="build/$(TargetFramework)" />-->
-
     <UpToDateCheck Include="@(EmbeddedResource);@(_PackageFiles);@(None)" />
   </ItemGroup>
 
@@ -87,25 +79,4 @@ Built from $(RepositoryUrl)/tree/$(SourceRevisionId.Substring(0, 9))
     <Exec Command='rm -rf "$(HttpNuGetCache)"' Condition="'$(OS)' != 'Windows_NT'" />
   </Target>
 
-  <!-- For every PackageReference with Pack=true, we include the assemblies from it in the package -->
-  <Target Name="AddPackDependencies" Condition="'' != ''" Inputs="@(RuntimeCopyLocalItems)" Outputs="%(RuntimeCopyLocalItems.NuGetPackageId)" AfterTargets="ResolvePackageAssets">
-    <ItemGroup>
-      <NuGetPackageId Include="@(RuntimeCopyLocalItems -> '%(NuGetPackageId)')" />
-    </ItemGroup>
-    <PropertyGroup>
-      <NuGetPackageId>@(NuGetPackageId -&gt; Distinct())</NuGetPackageId>
-    </PropertyGroup>
-    <ItemGroup>
-      <PackageReferenceDependency Include="@(PackageReference -&gt; WithMetadataValue('Identity', '$(NuGetPackageId)'))" />
-    </ItemGroup>
-    <PropertyGroup>
-      <NuGetPackagePack>@(PackageReferenceDependency -> '%(Pack)')</NuGetPackagePack>
-    </PropertyGroup>
-    <ItemGroup Condition="'$(NuGetPackagePack)' == 'true'">
-      <_PackageFiles Include="@(RuntimeCopyLocalItems)" PackagePath="$(BuildOutputTargetFolder)/$(TargetFramework)/%(Filename)%(Extension)" />
-      <RuntimeCopyLocalItems Update="@(RuntimeCopyLocalItems)" CopyLocal="true" Private="true" />
-      <ResolvedFileToPublish Include="@(RuntimeCopyLocalItems)" CopyToPublishDirectory="PreserveNewest" RelativePath="%(Filename)%(Extension)" />
-    </ItemGroup>
-  </Target>
-
 </Project>

img/launchSettings.png

@@ -1,7 +1,4 @@
-using System;
-using System.Diagnostics;
-using System.IO;
-using System.Text;
+using System.Diagnostics;
 using Microsoft.CodeAnalysis;
 
 namespace SmallSharp