feat(widget): api to handle easily hello

2 files changed, 59 insertions, 0 deletions

diff --git a/widget/api/handle.go b/widget/api/handle.go
new file mode 100644
index 0000000..e04d3d2
--- /dev/null
+++ b/widget/api/handle.go
@@ -0,0 +1,34 @@
+package api
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+type Widget struct {
+	Hello
+	Writer io.Writer
+}
+
+func NewWidget(name, id string) *Widget {
+	return &Widget{
+		Hello: Hello{
+			Name:    name,
+			ID:      id,
+			Version: 1,
+		},
+		Writer: os.Stdout,
+	}
+}
+
+func (w *Widget) Handle() error {
+	if len(os.Args) < 2 {
+		return fmt.Errorf("no method")
+	}
+	switch Method(os.Args[1]) {
+	case MethodHello:
+		return w.Hello.Respond(w.Writer)
+	}
+	return fmt.Errorf("unknown method: %s", os.Args[1])
+}
diff --git a/widget/api/hello.go b/widget/api/hello.go
new file mode 100644
index 0000000..7995a36
--- /dev/null
+++ b/widget/api/hello.go
@@ -0,0 +1,25 @@
+package api
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type Method string
+
+const MethodHello Method = "hello"
+
+type Hello struct {
+	Name    string `json:"name"`
+	ID      string `json:"id"`
+	Version uint   `json:"version"`
+}
+
+func (h *Hello) Respond(w io.Writer) error {
+	b, err := json.Marshal(h)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(b)
+	return err
+}