add ilm forecast show

cmd/ilm_forecast.go

@@ -34,6 +34,7 @@ func IlmForecast(conf *cfg.Config) *cli.Command {
 
 		Commands: []*cli.Command{
 			IlmForecastList(conf),
+			IlmForecastShow(conf),
 		},
 	}
 }
@@ -69,3 +70,35 @@ func IlmForecastList(conf *cfg.Config) *cli.Command {
 		},
 	}
 }
+
+func IlmForecastShow(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "show",
+		Aliases: []string{"sh"},
+		Usage:   "show rollover forecast over all indices",
+
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:        "from-phase",
+				Usage:       "which ilm phase to forecast from",
+				Destination: &conf.Ilm.FromPhase,
+				Aliases:     []string{"f"},
+			},
+			&cli.StringFlag{
+				Name:        "within",
+				Usage:       "duration withing which to forecast",
+				Destination: &conf.Ilm.Within,
+				Aliases:     []string{"w"},
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			valid := []string{"hot", "warm", "cold", "frozen"}
+			if !slices.Contains(valid, conf.Ilm.FromPhase) {
+				return errors.New("invalid from phase, allowed: hot, warm, cold, frozen")
+			}
+
+			return es.IlmForecastShow(conf)
+		},
+	}
+}