Improved Windows DLL calls

src/dll/List.go

@@ -3,6 +3,26 @@ package dll
 // List is a slice of DLLs.
 type List []DLL
 
+// Append adds a function for the given DLL if it doesn't exist yet.
+func (list List) Append(dllName string, funcName string) List {
+	for _, dll := range list {
+		if dll.Name != dllName {
+			continue
+		}
+
+		for _, fn := range dll.Functions {
+			if fn == funcName {
+				return list
+			}
+		}
+
+		dll.Functions = append(dll.Functions, funcName)
+		return list
+	}
+
+	return append(list, DLL{Name: dllName, Functions: []string{funcName}})
+}
+
 // Index returns the position of the given function name.
 func (list List) Index(dllName string, funcName string) int {
 	index := 0