Fix issue with world stubs (#756)

Signed-off-by: James Sturtevant <[email protected]>

Author: jsturtevant

crates/csharp/src/lib.rs

@@ -440,37 +440,50 @@ impl WorldGenerator for CSharp {
 
         files.push(&format!("{name}.cs"), indent(&src).as_bytes());
 
-        let generate_stub =
-            |name: String, files: &mut Files, fragments: &Vec<InterfaceFragment>| {
-                let stub_file_name = format!("{name}Impl");
-                let interface_name = CSharp::get_class_name_from_qualified_name(name.clone());
-                let stub_class_name = format!("{interface_name}Impl");
+        let generate_stub = |name: String, files: &mut Files, stubs: Stubs| {
+            let stub_file_name = format!("{name}Impl");
+            let interface_name = CSharp::get_class_name_from_qualified_name(name.clone());
+            let stub_class_name = format!("{interface_name}Impl");
+
+            let (fragments, fully_qaulified_namespace) = match stubs {
+                Stubs::World(fragments) => {
+                    let fully_qaulified_namespace = format!("{namespace}");
+                    (fragments, fully_qaulified_namespace)
+                }
+                Stubs::Interface(fragments) => {
+                    let fully_qaulified_namespace = format!("{namespace}.{name}");
+                    (fragments, fully_qaulified_namespace)
+                }
+            };
 
-                let body = fragments
-                    .iter()
-                    .map(|f| f.stub.deref())
-                    .collect::<Vec<_>>()
-                    .join("\n");
+            let body = fragments
+                .iter()
+                .map(|f| f.stub.deref())
+                .collect::<Vec<_>>()
+                .join("\n");
 
-                let body = format!(
-                    "// Generated by `wit-bindgen` {version}. DO NOT EDIT!
+            let body = format!(
+                "// Generated by `wit-bindgen` {version}. DO NOT EDIT!
                 {CSHARP_IMPORTS}
 
-                namespace {namespace}.{name};
+                namespace {fully_qaulified_namespace};
 
                  public partial class {stub_class_name} : {interface_name} {{
                     {body}
                  }}
                 "
-                );
+            );
 
-                files.push(&format!("{stub_file_name}.cs"), indent(&body).as_bytes());
-            };
+            files.push(&format!("{stub_file_name}.cs"), indent(&body).as_bytes());
+        };
 
-        // TODO: is the world Impl class useful?
-        // if self.opts.generate_stub {
-        //     generate_stub(format!("{name}"), files);
-        // }
+        if self.opts.generate_stub {
+            generate_stub(
+                format!("{name}World"),
+                files,
+                Stubs::World(&self.world_fragments),
+            );
+        }
 
         files.push(
             &format!("{snake}_component_type.o",),
@@ -529,7 +542,7 @@ impl WorldGenerator for CSharp {
             files.push(&format!("{name}Interop.cs"), indent(&body).as_bytes());
 
             if interface_type_and_fragments.is_export && self.opts.generate_stub {
-                generate_stub(format!("{name}"), files, fragments);
+                generate_stub(format!("{name}"), files, Stubs::Interface(fragments));
             }
         }
     }
@@ -1259,6 +1272,11 @@ impl<'a> wit_bindgen_core::InterfaceGenerator<'a> for InterfaceGenerator<'a> {
     }
 }
 
+enum Stubs<'a> {
+    World(&'a Vec<InterfaceFragment>),
+    Interface(&'a Vec<InterfaceFragment>),
+}
+
 struct Block {
     _body: String,
     _results: Vec<String>,

crates/csharp/tests/codegen.rs

@@ -52,13 +52,11 @@ macro_rules! codegen_test {
                         "result-empty",
                         "ret-areas",
                         "return-resource-from-export",
-                        "same-names2",
                         "same-names5",
                         "simple-functions",
                         "simple-http",
                         "simple-lists",
                         "small-anonymous",
-                        "smoke-default",
                         "strings",
                         "unused-import",
                         "use-across-interfaces",