Merge pull request #77 from nihohit/no-class

Allow generating bindings without a class.

csbindgen-tests/src/only_enums_and_structs.rs

@@ -0,0 +1,12 @@
+#[repr(C)]
+pub enum Foo {
+    Bar = 1,
+    Baz = 2,
+}
+
+#[repr(C)]
+pub struct Vec3 {
+    x: f32,
+    y: f32,
+    z: f32,
+}

csbindgen/src/emitter.rs

@@ -343,6 +343,22 @@ pub fn emit_csharp(
         }
     }
 
+    // use empty string if the generated class is empty.
+    let class_string = if method_list_string.is_empty() && const_string.is_empty() {
+        String::new()
+    } else {
+        format!(
+            "{accessibility} static unsafe partial class {class_name}
+    {{
+{dll_name}
+
+{const_string}
+
+{method_list_string}
+    }}"
+        )
+    };
+
     let file_header = if options.csharp_file_header.len() > 0 {
         options.csharp_file_header.to_string() + "\n"
     } else {
@@ -368,14 +384,7 @@ using System.Runtime.InteropServices;
 
 namespace {namespace}
 {{
-    {accessibility} static unsafe partial class {class_name}
-    {{
-{dll_name}
-
-{const_string}
-
-{method_list_string}
-    }}
+    {class_string}
 
 {structs_string}
 {enum_string}

csbindgen/src/lib.rs

@@ -201,4 +201,31 @@ mod tests {
         file.write_all(new_toml.as_bytes()).unwrap();
         file.flush().unwrap();
     }
+
+    fn compare_and_delete_files(original_file_path: &str, generated_file_path: &str) {
+                let original = fs::read_to_string(original_file_path)
+            .expect("Should have been able to read original file");
+
+        let generated = fs::read_to_string(generated_file_path)
+            .expect("Should have been able to read generated file");
+
+        assert_eq!(original, generated);
+
+        fs::remove_file(generated_file_path).unwrap();
+    }
+
+    #[test]
+    fn test_emit_without_class() {
+        let generated_file_path = "dotnet-sandbox/only_enums_and_structs_bindgen.cs";
+        Builder::new()
+            .always_included_types(["Vec3", "Foo"])
+            .input_bindgen_file("csbindgen-tests/src/only_enums_and_structs.rs")
+            .generate_csharp_file(generated_file_path)
+            .unwrap();
+
+        compare_and_delete_files(
+            "dotnet-sandbox/only_enums_and_structs_original.cs",
+            generated_file_path,
+        );
+    }
 }

dotnet-sandbox/only_enums_and_structs_original.cs

@@ -0,0 +1,31 @@
+// <auto-generated>
+// This code is generated by csbindgen.
+// DON'T CHANGE THIS DIRECTLY.
+// </auto-generated>
+#pragma warning disable CS8500
+#pragma warning disable CS8981
+using System;
+using System.Runtime.InteropServices;
+
+
+namespace CsBindgen
+{
+
+
+    [StructLayout(LayoutKind.Sequential)]
+    internal unsafe partial struct Vec3
+    {
+        public float x;
+        public float y;
+        public float z;
+    }
+
+
+    internal enum Foo : uint
+    {
+        Bar = 1,
+        Baz = 2,
+    }
+
+
+}