added yamltool sort

cmd/yamltool/sort.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"cmp"
+	"fmt"
+	"reflect"
+	"slices"
+
+	"github.com/goccy/go-yaml"
+	"github.com/spf13/cobra"
+
+	"os"
+)
+
+type MapSlice yaml.MapSlice
+
+func (s MapSlice) Sort() {
+	slices.SortFunc(s, func(a, b yaml.MapItem) int {
+		keya := fmt.Sprintf("%s", a.Key)
+		keyb := fmt.Sprintf("%s", b.Key)
+		return cmp.Compare(keya, keyb)
+	})
+	for _, item := range s {
+		switch {
+		case reflect.TypeOf(item.Value) == reflect.TypeOf(yaml.MapSlice{}):
+			((MapSlice)(item.Value.(yaml.MapSlice))).Sort()
+		case Type(item.Value) == Slice:
+			for _, v := range item.Value.([]any) {
+				ms, ok := v.(yaml.MapSlice)
+				if ok {
+					((MapSlice)(ms)).Sort()
+				}
+			}
+		}
+	}
+}
+
+func sortYaml(cmd *cobra.Command, args []string) error {
+	for _, arg := range args {
+		data, err := read(arg)
+		if err != nil {
+			return err
+		}
+		doc, err := parse(data)
+		if err != nil {
+			return fmt.Errorf("%s: %v\n", arg, err.Error())
+		}
+		((MapSlice)(doc)).Sort()
+		if len(args) > 1 {
+			fmt.Printf("---\n")
+		}
+		encode(os.Stdout, doc)
+	}
+	return nil
+}