(cli): Add --refresh flag to dash command

tools/asynq/cmd/dash.go

@@ -5,18 +5,22 @@
 package cmd
 
 import (
+	"time"
+
 	"github.com/MakeNowJust/heredoc/v2"
 	"github.com/hibiken/asynq/tools/asynq/cmd/dash"
 	"github.com/spf13/cobra"
 )
 
 var (
-	flagDebug       = false
-	flagUseRealData = false
+	flagDebug        = false
+	flagUseRealData  = false
+	flagPollInterval = 8 * time.Second
 )
 
 func init() {
 	rootCmd.AddCommand(dashCmd)
+	dashCmd.Flags().DurationVar(&flagPollInterval, "refresh", 8*time.Second, "Interval between data refresh")
 	// TODO: Remove this debug once we're done
 	dashCmd.Flags().BoolVar(&flagDebug, "debug", false, "Print debug info")
 	dashCmd.Flags().BoolVar(&flagUseRealData, "realdata", true, "Use real data in redis")
@@ -30,8 +34,9 @@ var dashCmd = &cobra.Command{
 	Args: cobra.NoArgs,
 	Run: func(cmd *cobra.Command, args []string) {
 		dash.Run(dash.Options{
-			DebugMode:   flagDebug,
-			UseRealData: flagUseRealData,
+			DebugMode:    flagDebug,
+			UseRealData:  flagUseRealData,
+			PollInterval: flagPollInterval,
 		})
 	},
 }

tools/asynq/cmd/dash/dash.go

@@ -77,7 +77,6 @@ func Run(opts Options) {
 		os.Exit(1)
 	}
 	s.SetStyle(baseStyle) // set default text style
-	opts.PollInterval = 2 * time.Second
 
 	var (
 		state = State{} // confined in this goroutine only; DO NOT SHARE