Animated grade-polling timer

Author: Steven Xie

cmd/grades.go

@@ -135,9 +135,13 @@ check:
 		interval := time.Duration(rng.Int63n(int64(gradesMaxPollInterval-
 			gradesMinPollInterval))) + gradesMinPollInterval
 
-		interact.Errf("Checking again in %.f seconds (press ctrl-c to stop).\n",
-			interval.Seconds())
-		time.Sleep(interval)
+		for interval >= 0 {
+			interact.Errf("\rChecking again in %.f seconds (press ctrl-c to stop).",
+				interval.Seconds())
+			time.Sleep(time.Second)
+			interval -= time.Second
+		}
+		interact.Errln()
 		goto check
 	}
 	return nil

cmd/interactive.go

@@ -84,8 +84,10 @@ func interactiveHelp() {
 	}
 
 	// Add custom entries:
-	entries = append(entries, HelpEntry{"poll", "Poll grades repeatedly, every " +
-		"30s."})
+	entries = append(entries, HelpEntry{
+		"poll",
+		gradesCmd.GetFlag("poll").Model().Help,
+	})
 	entries = append(entries, HelpEntry{"quit", "Quit interactive mode."})
 
 	fmt.Println("Commands:")