moon get now emits in moon syntax

cmd/moon/main.go

@@ -64,7 +64,11 @@ func get() {
 	if err := doc.Get(docpath, &v); err != nil {
 		bail(1, "error reading value at path %s: %s", docpath, err)
 	}
-	fmt.Println(v)
+	b, err := moon.Encode(v)
+	if err != nil {
+		bail(1, "error encoding value: %s", err)
+	}
+	os.Stdout.Write(b)
 }
 
 func bail(status int, t string, args ...interface{}) {

lib/emit.go

@@ -68,6 +68,10 @@ func typeEncoder(t reflect.Type) encodeFn {
 		return encodeStruct
 	case reflect.Slice:
 		return encodeSlice
+	case reflect.Interface:
+		return encodeInterface
+	case reflect.Map:
+		return encodeMap
 	default:
 		panic(fmt.Errorf("unhandled type: %v kind: %v", t, t.Kind()))
 	}
@@ -98,7 +102,7 @@ func encodeFloat(bits int) encodeFn {
 		if math.IsInf(f, 0) || math.IsNaN(f) {
 			panic("that value is bad") // TODO: not this
 		}
-		b := strconv.AppendFloat(e.scratch[:0], f, 'f', 1, bits)
+		b := strconv.AppendFloat(e.scratch[:0], f, 'g', -1, bits)
 		e.Write(b)
 	}
 }
@@ -155,3 +159,31 @@ func encodeSlice(e *encoder, v reflect.Value) {
 	}
 	e.WriteByte(']')
 }
+
+func encodeInterface(e *encoder, v reflect.Value) {
+	if v.IsNil() {
+		e.WriteString("null")
+		return
+	}
+	e.encodeValue(v.Elem())
+}
+
+func encodeMap(e *encoder, v reflect.Value) {
+	t := v.Type()
+	if t.Key().Kind() != reflect.String {
+		panic(fmt.Errorf("unsupported map key type: %v", t.Key().Kind()))
+	}
+	keys := v.MapKeys()
+	e.WriteByte('{')
+	for i, key := range keys {
+		if i > 0 {
+			e.WriteByte(' ')
+		}
+		e.WriteString(key.String()) // TODO: escape this?
+		e.WriteByte(':')
+		e.WriteByte(' ')
+		elem := v.MapIndex(key)
+		e.encodeValue(elem)
+	}
+	e.WriteByte('}')
+}

lib/emit_test.go

@@ -33,6 +33,18 @@ var valueTests = []struct {
 	{[]float32{1.0, 2.2, 3.3}, `[1.0 2.2 3.3]`},
 	{[]float64{1.0, 2.2, 3.3}, `[1.0 2.2 3.3]`},
 	{[]string{"one", "two", "three"}, `["one" "two" "three"]`},
+	{
+		map[string]int{"one": 1, "two": 2, "three": 3},
+		`{one: 1 two: 2 three: 3}`,
+	},
+	{
+		map[string]interface{}{
+			"one": 1,
+			"two": 2.0,
+			"pi":  3.14,
+		},
+		`{one: 1 two: 2.0 pi: 3.14}`,
+	},
 }
 
 func TestWriteValues(t *testing.T) {