fix: Make the clean container command more selective about what it cl…

…eans

We have some code which *is* generated code, but not generated in a regular way - e.g. conformance tests, common resource names, BigQuery resource classes. Those are all updated by running their generators manually, so shouldn't be cleaned here.

tools/Google.Cloud.Tools.ReleaseManager/ContainerCommands/CleanCommand.cs

@@ -36,50 +36,73 @@ public int Execute(Dictionary<string, string> options)
         var generatorInput = Path.Combine(repoRoot, DirectoryLayout.GeneratorInput);
         var catalog = ApiCatalog.LoadFromGeneratorInput(generatorInput);
 
-        List<string> ids;
+        List<ApiMetadata> apis;
         if (apiPath is not null)
         {
-            ids = new List<string>();
+            apis = new List<ApiMetadata>();
             var targetApi = catalog.Apis.SingleOrDefault(api => api.ProtoPath == apiPath);
             if (targetApi is null)
             {
                 Console.WriteLine($"API path '{apiPath}' is not configured for any API. Ignoring.");
             }
             else
             {
-                ids.Add(targetApi.Id);
+                apis.Add(targetApi);
             }
         }
         else
         {
-            ids = catalog.Apis.Select(api => api.Id).OrderBy(id => id, StringComparer.Ordinal).ToList();
+            apis = catalog.Apis.ToList();
         }
 
         var nonSourceGenerator = new NonSourceGenerator(generatorInput, repoRoot);
 
-        foreach (var id in ids)
+        foreach (var api in apis)
         {
-            Console.WriteLine($"Cleaning {id}");
+            CleanApiFiles(api);
+        }
+        Console.WriteLine($"Cleaning non-API-specific files");
+        nonSourceGenerator.CleanNonApiFiles();
+        return 0;
 
-            // GAPIC files and directories (except project files, which are removed by the non-source generator).
-            var layout = DirectoryLayout.ForApi(id, repoRoot, generatorInput);
-            // Source code
-            DeleteAll(Directory.EnumerateFiles(layout.SourceDirectory, "*.g.cs", SearchOption.AllDirectories));
-            // Snippet metadata
-            var generatedSnippetsDirectory = Path.Combine(layout.SourceDirectory, $"{id}.GeneratedSnippets");
-            if (Directory.Exists(generatedSnippetsDirectory))
+        void CleanApiFiles(ApiMetadata api)
+        {
+            Console.WriteLine($"Cleaning {api.Id}");
+            var layout = DirectoryLayout.ForApi(api.Id, repoRoot, generatorInput);
+
+            switch (api.Generator)
             {
-                DeleteAll(Directory.EnumerateFiles(generatedSnippetsDirectory, "*.json"));
+                case GeneratorType.Proto:
+                    // We don't generate any snippets for proto-only APIs.
+                    DeleteGeneratedSource("");
+                    break;
+                case GeneratorType.Micro:
+                    DeleteGeneratedSource("");
+                    DeleteGeneratedSource(".Snippets");
+                    DeleteGeneratedSource(".GeneratedSnippets");
+                    var generatedSnippetsDirectory = Path.Combine(layout.SourceDirectory, $"{api.Id}.GeneratedSnippets");
+                    if (Directory.Exists(generatedSnippetsDirectory))
+                    {
+                        DeleteAll(Directory.EnumerateFiles(generatedSnippetsDirectory, "*.json"));
+                    }
+                    File.Delete(Path.Combine(layout.SourceDirectory, "gapic_metadata.json"));
+                    break;
+                default:
+                    // We didn't generate any code, so we leave anything that's still there alone.
+                    // Any project files which were generated will be deleted by nonSourceGenerator.
+                    // Note that there may be other generated files, e.g. conformance tests, or the BigQuery
+                    // separate generator - but they're not generated by GenerateApis.
+                    break;
             }
-            // GAPIC metadata
-            File.Delete(Path.Combine(layout.SourceDirectory, "gapic_metadata.json"));
-
-            nonSourceGenerator.CleanApiFiles(id);
+            nonSourceGenerator.CleanApiFiles(api.Id);
             PruneEmptyDirectories(layout.SourceDirectory);
+
+            void DeleteGeneratedSource(string directorySuffix)
+            {
+                var directory = Path.Combine(layout.SourceDirectory, $"{api.Id}{directorySuffix}");
+                DeleteAll(Directory.EnumerateFiles(directory, "*.g.cs", SearchOption.AllDirectories));
+            }
         }
-        Console.WriteLine($"Cleaning non-API-specific files");
-        nonSourceGenerator.CleanNonApiFiles();
-        return 0;
     }
 
     private static void DeleteAll(IEnumerable<string> files)