Initial working commit

generator/format.go

@@ -0,0 +1,41 @@
+package generator
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Format string
+
+const (
+	JPG  Format = "jpg"
+	PNG  Format = "png"
+	BMP  Format = "bmp"
+	WEBP Format = "webp"
+	GIF  Format = "gif"
+	ICO  Format = "ico"
+	DEF  Format = "default"
+)
+
+func (g *Generator) StringToFormat(string string) (Format, error) {
+	switch strings.ToLower(string) {
+	case "jpg":
+		return JPG, nil
+	case "jpeg":
+		return JPG, nil
+	case "png":
+		return PNG, nil
+	case "bmp":
+		return BMP, nil
+	case "webp":
+		return WEBP, nil
+	case "gif":
+		return GIF, nil
+	case "ico":
+		return ICO, nil
+	case "":
+		return DEF, nil
+	}
+
+	return "", fmt.Errorf("%s is not a valid format", string)
+}