basic HTTP api and uistate.

internal/color/color.go

@@ -1,6 +1,7 @@
 package color
 
 import (
+	"encoding/json"
 	"fmt"
 	"github.com/lucasb-eyer/go-colorful"
 	"math"
@@ -15,6 +16,21 @@ type Color struct {
 	XY  *XY     `json:"xy,omitempty"`
 }
 
+func (col *Color) MarshalJSON() ([]byte, error) {
+	return json.Marshal(col.String())
+}
+
+func (col *Color) UnmarshalJSON(bytes []byte) error {
+	var s string
+	err := json.Unmarshal(bytes, &s)
+	if err != nil {
+		return err
+	}
+
+	*col, err = Parse(s)
+	return err
+}
+
 func (col *Color) IsHueSat() bool {
 	return col.HS != nil
 }