refactor(internal/cmd): move backend cmd functions to grafanabackuper package

internal/cmd/root.go

@@ -6,8 +6,10 @@ import (
 	"strings"
 
 	"git.ar21.de/yolokube/grafana-backuper/internal/config"
+	"git.ar21.de/yolokube/grafana-backuper/internal/logger"
 	"git.ar21.de/yolokube/grafana-backuper/internal/version"
-	log "github.com/sirupsen/logrus"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
@@ -24,22 +26,27 @@ func NewRootCommand(c *config.Config) *cobra.Command {
 		PersistentPreRun: func(cmd *cobra.Command, _ []string) {
 			initializeConfig(cmd)
 
-			c.Output = os.Stdout
-
-			log.SetOutput(c.Output)
-			log.SetLevel(log.InfoLevel)
-			cmd.SetOut(c.Output)
+			// c.Output = os.Stdout
+			cmd.SetOut(os.Stdout)
 
+			zerolog.SetGlobalLevel(zerolog.InfoLevel)
 			if c.Debug {
-				log.SetLevel(log.DebugLevel)
+				zerolog.SetGlobalLevel(zerolog.DebugLevel)
+			}
+
+			if c.JSONFormat {
+				log.Logger = logger.JSONLoggerLayout(os.Stderr)
+				c.Logger = logger.JSONLoggerLayout(os.Stdout)
+			} else {
+				log.Logger = logger.CliLoggerLayout(os.Stderr)
+				c.Logger = logger.CliLoggerLayout(os.Stdout)
 			}
 		},
 		SilenceUsage: true,
 	}
 
-	rootCmd.SetErrPrefix("Error:")
-
 	rootCmd.PersistentFlags().BoolVarP(&c.Debug, "debug", "d", false, "Debug output")
+	rootCmd.PersistentFlags().BoolVar(&c.JSONFormat, "json", false, "JSON output")
 	rootCmd.PersistentFlags().StringVar(&c.GrafanaURL, "grafana-url", "", "Grafana URL to access the API")
 	rootCmd.PersistentFlags().StringVar(&c.GrafanaToken, "grafana-token", "", "Grafana auth token to access the API")
 	rootCmd.PersistentFlags().StringVar(&c.GitBranch, "git-branch", "main", "Git branch name")