rewrite

internal/codec/codec.go

@@ -0,0 +1,50 @@
+package codec
+
+import (
+	"image"
+	"io"
+
+	"github.com/coalaura/ffwebp/internal/opts"
+	"github.com/urfave/cli/v3"
+)
+
+type Codec interface {
+	Name() string
+
+	Flags([]cli.Flag) []cli.Flag
+	Extensions() []string
+
+	Sniff(io.ReaderAt) (int, error)
+	Decode(io.Reader) (image.Image, error)
+	Encode(io.Writer, image.Image, opts.Common) error
+}
+
+var codecs = map[string]Codec{}
+
+func Register(c Codec) {
+	codecs[c.Name()] = c
+}
+
+func Flags(flags []cli.Flag) []cli.Flag {
+	for _, codec := range codecs {
+		flags = codec.Flags(flags)
+	}
+
+	return flags
+}
+
+func Get(name string) (Codec, bool) {
+	c, ok := codecs[name]
+
+	return c, ok
+}
+
+func All() []Codec {
+	out := make([]Codec, 0, len(codecs))
+
+	for _, c := range codecs {
+		out = append(out, c)
+	}
+
+	return out
+}