API Notes: Add support for converting free functions to static methods

changelog.md

@@ -12,6 +12,7 @@
 * [Issue 288](https://github.com/jacob-carlborg/dstep/issues/288): Missing `__u/int128` support
 * Add support for renaming global functions using API notes
 * Add support for converting free functions to instance methods using API notes
+* Add support for converting free functions to static methods using API notes
 
 ### Bugs Fixed
 

dstep/translator/Translator.d

@@ -312,6 +312,26 @@ class Translator
             });
         }
 
+        else if (func.isStaticMethod.or(false))
+        {
+            auto context = func.flatMap!(f => f.context).or("");
+
+            this.context.addAnnotatedMember(context, (Output output) {
+                auto function_ = Function(
+                    cursor: cursor.func,
+                    name: name,
+                    mangledName: none!string, // handle below
+                    apiNotesFunction: func,
+                    isStatic: true
+                );
+
+                auto result = translateFunction(this.context, function_);
+                output.singleLine(`extern (C) pragma(mangle, "%s")`, cursor.mangling);
+                output.adaptiveSourceNode(result);
+                output.append(";");
+            });
+        }
+
         else
         {
             auto function_ = Function(

tests/unit/ApiNotes.d

@@ -280,3 +280,28 @@ struct Bar
 D", options, annotatedFile: "Bar.d");
     }
 }
+
+@"free function to static method" unittest
+{
+    auto options = Options(apiNotes:
+q"YAML
+Functions:
+  - Name: foo
+    DName: Bar.foo(a:)
+YAML"
+);
+
+    assertTranslatesAnnotated(
+q"C
+struct Bar {};
+
+void foo(int a);
+C",
+q"D
+struct Bar
+{
+    extern (C) pragma(mangle, "foo")
+    static void foo (int a);
+}
+D", options, annotatedFile: "Bar.d");
+}