feat: json output formatter

cmd/config.go

@@ -4,11 +4,3 @@ type AppConfig struct {
 	OutputVerbose bool
 	OutputMode    string
 }
-
-type OutputMode string
-
-const (
-	Go   OutputMode = "go"
-	Json OutputMode = "json"
-	Yaml OutputMode = "yaml"
-)

cmd/output.go

@@ -1,5 +0,0 @@
-package cmd
-
-type OutputProvider interface {
-	Convert(item any) (string, error)
-}

cmd/root.go

@@ -31,12 +31,12 @@ func initRootCmd() {
 	var appConfig AppConfig
 
 	rootCmd.PersistentFlags().BoolVarP(&appConfig.OutputVerbose, "verbose", "v", false, "Enable verbose output")
-	rootCmd.PersistentFlags().StringVarP(&appConfig.OutputMode, "output", "o", string(Json), "Set output format")
+	rootCmd.PersistentFlags().StringVarP(&appConfig.OutputMode, "output", "o", "json", "Set output format")
 
 	logger := jlog.New(slog.LevelDebug)
 	ctx := jlog.ContextWith(context.Background(), logger)
 
 	logger.Debug("Register verb commands")
-	rootCmd.AddCommand(getVerbs(ctx)...)
+	rootCmd.AddCommand(getVerbs(ctx, appConfig)...)
 	logger.Debug("Verb commands registered successfully")
 }

cmd/verbs.go

@@ -2,8 +2,8 @@ package cmd
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
+	"io"
 	"log/slog"
 	"os"
 	"slices"
@@ -11,6 +11,7 @@ import (
 
 	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
 	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces/params"
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/output"
 	"git.bissendorf.co/bissendorf/unifood/m/v2/core/services/jlog"
 	"github.com/spf13/cobra"
 )
@@ -19,32 +20,47 @@ type VerbItem struct {
 	Name        interfaces.Verb
 	Aliases     []string
 	Description string
-	RunFn       func(ctx context.Context, handler interfaces.ResourceHandler, params params.Container) error
+	RunFn       func(ctx context.Context, config AppConfig, handler interfaces.ResourceHandler, params params.Container) error
 }
 
 var verbs = []VerbItem{
 	{
 		Name:        interfaces.VerbGet,
 		Description: "Retrieve resource information",
-		RunFn: func(ctx context.Context, handler interfaces.ResourceHandler, params params.Container) error {
+		RunFn: func(ctx context.Context, config AppConfig, handler interfaces.ResourceHandler, params params.Container) error {
 			h, ok := handler.(interfaces.GetHandler)
 			if !ok {
 				return fmt.Errorf("resource does not support GET")
 			}
 
+			// Get item
 			item, err := h.Get(ctx, params)
 			if err != nil {
 				return fmt.Errorf("retrieving item failed: %w", err)
 			}
 
-			json.NewEncoder(os.Stdout).Encode(item)
+			formatterName := strings.ToLower(config.OutputMode)
+			formatter, exists := output.Formatters[formatterName]
+			if !exists {
+				return fmt.Errorf("could not find output formatter '%s'", formatterName)
+			}
+
+			// Format and output
+			formatted, err := formatter.Format(item)
+			if err != nil {
+				return fmt.Errorf("failed to format output: %w", err)
+			}
+			_, err = io.Copy(os.Stdout, formatted)
+			if err != nil {
+				return fmt.Errorf("failed to write output: %w", err)
+			}
 
 			return nil
 		},
 	},
 }
 
-func getVerbs(ctx context.Context) (commands []*cobra.Command) {
+func getVerbs(ctx context.Context, config AppConfig) (commands []*cobra.Command) {
 	logger := jlog.FromContext(ctx)
 
 	for _, v := range verbs {
@@ -69,7 +85,7 @@ func getVerbs(ctx context.Context) (commands []*cobra.Command) {
 				Run: func(cmd *cobra.Command, args []string) {
 					logger := jlog.New(slog.LevelInfo)
 					ctx := jlog.ContextWith(context.Background(), logger)
-					err := v.RunFn(ctx, r.Handler, params)
+					err := v.RunFn(ctx, config, r.Handler, params)
 					if err != nil {
 						logger.ErrorContext(ctx, fmt.Sprintf("%s %s failed", strings.ToUpper(string(v.Name)), r.Name), "error", err.Error())
 						os.Exit(1)

core/interfaces/output.go

@@ -0,0 +1,7 @@
+package interfaces
+
+import "io"
+
+type Formatter interface {
+	Format(object any) (io.Reader, error)
+}

core/output/formatter.go

@@ -0,0 +1,12 @@
+package output
+
+import (
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+)
+
+var Formatters = map[string]interfaces.Formatter{
+	"json":  &JsonFormatter{},
+	"go":    nil,
+	"table": nil,
+	"xml":   nil,
+}

core/output/json.go

@@ -0,0 +1,15 @@
+package output
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+)
+
+type JsonFormatter struct{}
+
+func (f *JsonFormatter) Format(object any) (io.Reader, error) {
+	var buffer = make([]byte, 0, 1024)
+	outputBuffer := bytes.NewBuffer(buffer)
+	return outputBuffer, json.NewEncoder(outputBuffer).Encode(object)
+}

go.mod

@@ -2,8 +2,9 @@ module git.bissendorf.co/bissendorf/unifood/m/v2
 
 go 1.24.0
 
+require github.com/spf13/cobra v1.9.1
+
 require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/spf13/cobra v1.9.1 // indirect
 	github.com/spf13/pflag v1.0.7 // indirect
 )