ManyDotNetSolutions: support for single-file programs.

Author: gfraiteur

src/PostSharp.Engineering.BuildTools/Build/Solutions/DotNetSolution.cs

@@ -18,6 +18,8 @@ public class DotNetSolution : Solution
     {
         public DotNetSolution( string solutionPath ) : base( solutionPath ) { }
 
+        public bool IsSingleFile => Path.GetExtension( this.SolutionPath ).Equals( ".cs", StringComparison.OrdinalIgnoreCase );
+
         public override bool Build( BuildContext context, BuildSettings settings ) => this.RunBuildOrTests( context, settings, test: false );
 
         public override bool Pack( BuildContext context, BuildSettings settings )
@@ -73,7 +75,12 @@ private bool RunBuildOrTests(
             string command;
             string args;
 
-            if ( test )
+            if ( this.IsSingleFile )
+            {
+                command = "run";
+                args = "";
+            }
+            else if ( test )
             {
                 command = "test";
                 args = $"--logger \"trx\" --logger \"console;verbosity=minimal\" --results-directory \"{resultsDirectory}\"";
@@ -112,7 +119,7 @@ private bool RunBuildOrTests(
                     return true;
                 }
 
-                context.Console.WriteMessage( $"Running {(test ? "test" : "build")} as configured in '{testJsonFile}'." );
+                context.Console.WriteMessage( $"Running `dotnet {command}` as configured in '{testJsonFile}'." );
 
                 _ = DotNetHelper.Run(
                     context,

src/PostSharp.Engineering.BuildTools/Build/Solutions/ManyDotNetSolutions.cs

@@ -183,7 +183,10 @@ void ProcessDirectory( string directory )
             {
                 // Do not process recursively if we find a file we can build.
                 // The order of processing is significant.
-                if ( AddFiles( directory, "*.proj", Model.BuildMethod.Build ) || AddFiles( directory, "*.sln" ) || AddFiles( directory, "*.csproj" ) )
+                if ( AddFiles( directory, "*.proj", Model.BuildMethod.Build )
+                     || AddFiles( directory, "*.sln" )
+                     || AddFiles( directory, "*.csproj" )
+                     || AddFiles( directory, "Program.cs" ) )
                 {
                     return;
                 }

src/PostSharp.Engineering.BuildTools/Utilities/DotNetHelper.cs

@@ -4,6 +4,7 @@
 using PostSharp.Engineering.BuildTools.Build;
 using PostSharp.Engineering.BuildTools.Build.Model;
 using PostSharp.Engineering.BuildTools.Tools.TeamCity;
+using System;
 using System.Globalization;
 using System.IO;
 using System.Text;
@@ -95,8 +96,11 @@ private static string CreateCommandLine(
 
             if ( isRunCommand )
             {
-                // The command `dotnet run SomeProject.csproj` does not work, it requires explicit argument name.
-                projectPrefix = "--project ";
+                if ( !Path.GetExtension( projectOrSolution ).Equals( ".cs", StringComparison.OrdinalIgnoreCase ) )
+                {
+                    // The command `dotnet run SomeProject.csproj` does not work, it requires explicit argument name.
+                    projectPrefix = "--project ";
+                }
 
                 // dotnet run does not support --nologo.
                 nologo = string.Empty;