added option for configuring the output for arrays.

cmd/yamldiff/yamldiff.go

@@ -4,10 +4,13 @@ import (
 	"bytes"
 	"fmt"
 	yaml "github.com/goccy/go-yaml"
+	"github.com/spf13/cobra"
 	"os"
 	"reflect"
 )
 
+var VERBOSITY = 2
+
 func read(file string) []byte {
 	data, err := os.ReadFile(file)
 	if err != nil {
@@ -66,6 +69,7 @@ func subtract(yaml2 yaml.MapSlice, yaml1 yaml.MapSlice) yaml.MapSlice {
 				res = append(res, item)
 			}
 		case Type(v1) == Slice && Type(v2) == Slice:
+
 			v2set := make(map[string]bool)
 			v1set := make(map[string]bool)
 			stringToValue := make(map[any]any)
@@ -80,7 +84,11 @@ func subtract(yaml2 yaml.MapSlice, yaml1 yaml.MapSlice) yaml.MapSlice {
 			s := make([]any, 0)
 			for k2, _ := range v2set {
 				if v1set[k2] {
+					if VERBOSITY == 2 {
 						s = append(s, "<UNMODIFIED>")
+					} else if VERBOSITY == 3 {
+						s = append(s, stringToValue[k2])
+					}
 				} else {
 					s = append(s, stringToValue[k2])
 				}
@@ -96,13 +104,12 @@ func subtract(yaml2 yaml.MapSlice, yaml1 yaml.MapSlice) yaml.MapSlice {
 	return res
 }
 
-func main() {
-	if len(os.Args) != 3 {
-		fmt.Fprintf(os.Stderr, `
-Usage: yamldiff <file1> <file2>")
-  Shows changes and additions made in <file2> w.r.t. <file1> 
-`)
-		os.Exit(1)
+func execute(cmd *cobra.Command, args []string) error {
+	if len(args) != 2 {
+		return fmt.Errorf("Parameters expected")
+	}
+	if VERBOSITY < 1 || VERBOSITY > 3 {
+		return fmt.Errorf("Array verbosity out of range")
 	}
 	file1 := os.Args[1]
 	file2 := os.Args[2]
@@ -118,8 +125,23 @@ Usage: yamldiff <file1> <file2>")
 		//yaml.UseOrderedMap(), // Preserve map order
 	)
 	err := enc.Encode(yaml2)
-	if err != nil {
-		panic(err)
+	return err
 }
 
+func main() {
+
+	cmd := &cobra.Command{
+		Use:   "yamldiff <file1> <file2>",
+		Short: "Shows one-way difference between yaml files",
+		Long: `
+Shows the changes in <file2> compared to <file1>`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return execute(cmd, args)
+		},
+	}
+
+	cmd.PersistentFlags().IntVarP(&VERBOSITY, "array-output-level",
+		"v", 1, "Array output level: , 1: only show changed/added values, 2 (default) show identical as <UNMODIFIED>, 3: show all values")
+
+	cmd.Execute()
 }

go.mod

@@ -2,4 +2,12 @@ module git.wamblee.org/public/gotools
 
 go 1.23.3
 
-require github.com/goccy/go-yaml v1.15.13
+require (
+	github.com/goccy/go-yaml v1.15.13
+	github.com/spf13/cobra v1.8.1
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+)