feat: go output formatter

cmd/config.go

@@ -2,5 +2,6 @@ package cmd
 
 type AppConfig struct {
 	OutputVerbose   bool
-	OutputMode    string
+	OutputFormatter string
+	PrintConfig     bool
 }

cmd/root.go

@@ -31,12 +31,13 @@ func initRootCmd() {
 	var appConfig AppConfig
 
 	rootCmd.PersistentFlags().BoolVarP(&appConfig.OutputVerbose, "verbose", "v", false, "Enable verbose output")
-	rootCmd.PersistentFlags().StringVarP(&appConfig.OutputMode, "output", "o", "json", "Set output format")
+	rootCmd.PersistentFlags().StringVarP(&appConfig.OutputFormatter, "output", "o", "json", "Set output format")
+	rootCmd.PersistentFlags().BoolVar(&appConfig.PrintConfig, "print-config", false, "Enable printing the application config")
 
 	logger := jlog.New(slog.LevelDebug)
 	ctx := jlog.ContextWith(context.Background(), logger)
 
 	logger.Debug("Register verb commands")
-	rootCmd.AddCommand(getVerbs(ctx, appConfig)...)
+	rootCmd.AddCommand(getVerbs(ctx, &appConfig)...)
 	logger.Debug("Verb commands registered successfully")
 }

cmd/verbs.go

@@ -20,14 +20,14 @@ type VerbItem struct {
 	Name        interfaces.Verb
 	Aliases     []string
 	Description string
-	RunFn       func(ctx context.Context, config AppConfig, 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, config AppConfig, 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")
@@ -39,7 +39,7 @@ var verbs = []VerbItem{
 				return fmt.Errorf("retrieving item failed: %w", err)
 			}
 
-			formatterName := strings.ToLower(config.OutputMode)
+			formatterName := strings.ToLower(config.OutputFormatter)
 			formatter, exists := output.Formatters[formatterName]
 			if !exists {
 				return fmt.Errorf("could not find output formatter '%s'", formatterName)
@@ -60,7 +60,7 @@ var verbs = []VerbItem{
 	},
 }
 
-func getVerbs(ctx context.Context, config AppConfig) (commands []*cobra.Command) {
+func getVerbs(ctx context.Context, config *AppConfig) (commands []*cobra.Command) {
 	logger := jlog.FromContext(ctx)
 
 	for _, v := range verbs {
@@ -83,8 +83,19 @@ func getVerbs(ctx context.Context, config AppConfig) (commands []*cobra.Command)
 				Aliases: r.Aliases,
 				Short:   r.Description,
 				Run: func(cmd *cobra.Command, args []string) {
-					logger := jlog.New(slog.LevelInfo)
+					// Configure log
+					var logLevel = slog.LevelWarn
+					if config.OutputVerbose {
+						logLevel = slog.LevelDebug
+					}
+					logger := jlog.New(logLevel)
 					ctx := jlog.ContextWith(context.Background(), logger)
+
+					// Print config
+					if config.PrintConfig {
+						logger.WarnContext(ctx, "Printing app config", slog.Any("config", config), slog.Any("parameters", params.ToMap()))
+					}
+
 					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())

core/interfaces/params/params.go

@@ -54,3 +54,16 @@ func (c *Container) GetValue(key string) (any, error) {
 
 	return item.parseFn(*item.value)
 }
+
+// Returns a map of all parameters. Parameters that produce errors during parsing are ignored.
+func (c *Container) ToMap() (out map[string]any) {
+	out = make(map[string]any)
+	for key := range c.params {
+		v, err := c.GetValue(key)
+		if err == nil {
+			out[key] = v
+		}
+	}
+
+	return
+}

core/output/formatter.go

@@ -6,7 +6,7 @@ import (
 
 var Formatters = map[string]interfaces.Formatter{
 	"json":  &JsonFormatter{},
-	"go":    nil,
+	"yaml":  nil,
+	"go":    &GoFormatter{},
 	"table": nil,
-	"xml":   nil,
 }

core/output/go.go

@@ -0,0 +1,13 @@
+package output
+
+import (
+	"fmt"
+	"io"
+	"strings"
+)
+
+type GoFormatter struct{}
+
+func (f *GoFormatter) Format(object any) (io.Reader, error) {
+	return strings.NewReader(fmt.Sprintf("%#v", object)), nil
+}