Fixes rjeczalik#41: Add generics support for params and results

Add support for checking if the params or result types are
instantiated with types and if so, build up the name
appropriately.

example_test.go

@@ -9,6 +9,15 @@ import (
 	"github.com/rjeczalik/interfaces"
 )
 
+type Generic1[A any] struct {
+	Value A
+}
+
+type Generic2[A any, B any] struct {
+	Value  A
+	Value2 B
+}
+
 type ExampleFoo int
 
 type ExampleBar struct{}
@@ -35,6 +44,14 @@ func (ExampleBaz) D(*map[interface{}]struct{}, interface{}) (chan struct{}, []in
 
 func (*ExampleBaz) E(*[]map[*flag.FlagSet]struct{}, [3]string) {}
 
+func (*ExampleBaz) F(v Generic1[io.Writer]) (Generic2[io.Writer, ExampleFoo], int) {
+	return Generic2[io.Writer, ExampleFoo]{}, 0
+}
+
+func (*ExampleBaz) G(v Generic2[string, io.Writer]) (Generic1[int], int) {
+	return Generic1[int]{}, 0
+}
+
 func ExampleNew() {
 	i, err := interfaces.New(`github.com/rjeczalik/interfaces.ExampleBaz`)
 	if err != nil {
@@ -55,6 +72,8 @@ func ExampleNew() {
 	// C(map[string]int, *interfaces.Options, *http.Client) (chan []string, error)
 	// D(*map[interface{}]struct{}, interface{}) (chan struct{}, []interface{})
 	// E(*[]map[*flag.FlagSet]struct{}, [3]string)
+	// F(interfaces_test.Generic1[io.Writer]) (interfaces_test.Generic2[io.Writer, interfaces_test.ExampleFoo], int)
+	// G(interfaces_test.Generic2[string, io.Writer]) (interfaces_test.Generic1[int], int)
 	// Dependencies:
 	// flag
 	// github.com/rjeczalik/interfaces

type.go

@@ -99,6 +99,13 @@ func (typ *Type) setFromSignature(t *types.Signature) {
 func (typ *Type) setFromNamed(t *types.Named) {
 	if typ.Name == "" {
 		typ.Name = t.Obj().Name()
+		if typeArgs := t.TypeArgs(); typeArgs != nil && typeArgs.Len() > 0 {
+			argValues := make([]string, typeArgs.Len())
+			for i := 0; i < typeArgs.Len(); i++ {
+				argValues[i] = typeArgs.At(i).String()
+			}
+			typ.Name = fmt.Sprintf("%s[%s]", typ.Name, strings.Join(argValues, ", "))
+		}
 	}
 	if typ.Package != "" || typ.ImportPath != "" {
 		return