Discover how frames are encoded, use that knowledge to (finally) get the viewport locked in

internal/sets/sets.go

@@ -19,13 +19,13 @@ type MapSet struct {
 	Palette []string
 }
 
-func LoadSets(dir string) (map[string]MapSet, error) {
+func LoadSets(dir string) (map[string]*MapSet, error) {
 	fis, err := ioutil.ReadDir(dir)
 	if err != nil {
 		return nil, err
 	}
 
-	out := make(map[string]MapSet, len(fis))
+	out := make(map[string]*MapSet, len(fis))
 
 	for _, fi := range fis {
 		filename := filepath.Join(dir, fi.Name())
@@ -48,35 +48,34 @@ func LoadSets(dir string) (map[string]MapSet, error) {
 	return out, nil
 }
 
-func LoadSet(filename string) (MapSet, error) {
-	var out MapSet
-	var err error
+func LoadSet(filename string) (*MapSet, error) {
+	out := &MapSet{}
 
 	s, err := asciiscan.New(filename)
 	if err != nil {
-		return out, err
+		return nil, err
 	}
 
 	defer s.Close()
 
 	out.Description, err = s.ConsumeString()
 	if err != nil {
-		return out, err
+		return nil, err
 	}
 
 	out.Defs, err = consumeDefs(s)
 	if err != nil {
-		return out, err
+		return nil, err
 	}
 
 	for {
 		str, err := s.ConsumeString()
 		if err != nil {
 			if err == io.EOF {
-				err = nil
+				return out, nil
 			}
 
-			return out, err
+			return nil, err
 		}
 
 		out.Palette = append(out.Palette, str)