status hint shows [set] next to existing flag files

Author: Shlomi Noach

go/logic/migrator.go

@@ -874,13 +874,21 @@ func (this *Migrator) printMigrationStatusHint(writers ...io.Writer) {
 		))
 	}
 	if this.migrationContext.ThrottleFlagFile != "" {
-		fmt.Fprintln(w, fmt.Sprintf("# Throttle flag file: %+v",
-			this.migrationContext.ThrottleFlagFile,
+		setIndicator := ""
+		if base.FileExists(this.migrationContext.ThrottleFlagFile) {
+			setIndicator = "[set]"
+		}
+		fmt.Fprintln(w, fmt.Sprintf("# Throttle flag file: %+v %+v",
+			this.migrationContext.ThrottleFlagFile, setIndicator,
 		))
 	}
 	if this.migrationContext.ThrottleAdditionalFlagFile != "" {
-		fmt.Fprintln(w, fmt.Sprintf("# Throttle additional flag file: %+v",
-			this.migrationContext.ThrottleAdditionalFlagFile,
+		setIndicator := ""
+		if base.FileExists(this.migrationContext.ThrottleAdditionalFlagFile) {
+			setIndicator = "[set]"
+		}
+		fmt.Fprintln(w, fmt.Sprintf("# Throttle additional flag file: %+v %+v",
+			this.migrationContext.ThrottleAdditionalFlagFile, setIndicator,
 		))
 	}
 	if throttleQuery := this.migrationContext.GetThrottleQuery(); throttleQuery != "" {
@@ -889,8 +897,12 @@ func (this *Migrator) printMigrationStatusHint(writers ...io.Writer) {
 		))
 	}
 	if this.migrationContext.PostponeCutOverFlagFile != "" {
-		fmt.Fprintln(w, fmt.Sprintf("# Postpone cut-over flag file: %+v",
-			this.migrationContext.PostponeCutOverFlagFile,
+		setIndicator := ""
+		if base.FileExists(this.migrationContext.PostponeCutOverFlagFile) {
+			setIndicator = "[set]"
+		}
+		fmt.Fprintln(w, fmt.Sprintf("# Postpone cut-over flag file: %+v %+v",
+			this.migrationContext.PostponeCutOverFlagFile, setIndicator,
 		))
 	}
 	if this.migrationContext.PanicFlagFile != "" {