refactor(cmd): add backup command to cli

internal/cmd/root.go

@@ -0,0 +1,76 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"git.ar21.de/yolokube/grafana-backuper/internal/config"
+	"git.ar21.de/yolokube/grafana-backuper/internal/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const envVarPrefix = "GB"
+
+func NewRootCommand(c *config.Config) *cobra.Command {
+	rootCmd := &cobra.Command{
+		Use:     "grafana-backuper",
+		Short:   "Grafana Backuper CLI",
+		Long:    "A command-line tool to back up and restore Grafana dashboards",
+		Version: version.Version(),
+		PersistentPreRunE: func(cmd *cobra.Command, _ []string) error {
+			initializeConfig(cmd)
+
+			c.Output = os.Stdout
+			if c.Quiet {
+				var err error
+				c.Output, err = os.Open(os.DevNull)
+				if err != nil {
+					return err
+				}
+			}
+
+			cmd.SetOut(c.Output)
+			return nil
+		},
+		SilenceUsage: true,
+	}
+
+	rootCmd.SetErrPrefix("Error:")
+
+	rootCmd.PersistentFlags().BoolVarP(&c.Debug, "debug", "d", false, "Debug 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")
+	rootCmd.PersistentFlags().StringVar(&c.GitRepo, "git-repo", "", "Complete Git repository URL")
+	rootCmd.PersistentFlags().StringVar(&c.GitUser, "git-user", "", "Git user name")
+	rootCmd.PersistentFlags().StringVar(&c.GitPass, "git-pass", "", "Git user password")
+	rootCmd.PersistentFlags().BoolVarP(&c.Quiet, "quiet", "q", false, "Mute console output")
+
+	return rootCmd
+}
+
+func initializeConfig(cmd *cobra.Command) {
+	v := viper.New()
+	v.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	v.SetEnvPrefix(envVarPrefix)
+	v.AutomaticEnv()
+	bindFlags(cmd, v)
+}
+
+func bindFlags(cmd *cobra.Command, v *viper.Viper) {
+	cmd.Flags().VisitAll(func(flag *pflag.Flag) {
+		// Apply the viper config value to the flag when the flag is not set and viper has a value
+		if !flag.Changed && v.IsSet(flag.Name) {
+			err := cmd.Flags().Set(
+				flag.Name,
+				fmt.Sprintf("%v", v.Get(flag.Name)),
+			)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+			}
+		}
+	})
+}