Shorten the bandmap hover text to frequency, spotter, age and comment

The first line reads "14025.0 by K1TTT, 41m ago". The comment follows
on a second line and is left out when it is only LSB, USB or SSB.
Control characters are removed from the comment: cluster lines end in
bell and carriage-return characters, which the tooltip drew as boxes.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Nonemm.Spotting/SpotDescription.cs

@@ -2,23 +2,38 @@ using System.Globalization;
 
 namespace Nonemm.Spotting;
 
-/// What the bandmap shows when the pointer rests on a spot: who spotted it,
+/// What the bandmap shows when the pointer rests on a spot: the frequency,
-/// when, and the comment they sent.
+/// who spotted it and how long ago, and the comment if it says more than the
+/// sideband.
 public static class SpotDescription
 {
-    public static string Of(Spot spot)
+    public static string Of(Spot spot, DateTime? nowUtc = null)
     {
-        string time = spot.AtUtc.ToString("HH:mm", CultureInfo.InvariantCulture);
+        string age = Age((nowUtc ?? DateTime.UtcNow) - spot.AtUtc);
         string kilohertz = spot.Frequency.Kilohertz.ToString("0.0", CultureInfo.InvariantCulture);
-        string who = spot.Spotter.Length > 0
+        string first = spot.Spotter.Length > 0
-            ? $"Spotted by {spot.Spotter} at {time}Z"
+            ? $"{kilohertz} by {spot.Spotter}, {age}"
-            : spot.Source switch
+            : $"{kilohertz}, {age}";
+        string comment = Comment(spot.Comment);
+        return comment.Length > 0 ? $"{first}\n{comment}" : first;
+    }
+
+    private static string Age(TimeSpan span)
     {
-                SpotSource.Log => $"Worked at {time}Z",
+        int minutes = Math.Max(0, (int)span.TotalMinutes);
-                SpotSource.Operator => $"Spotted here at {time}Z",
+        return minutes switch
-                _ => $"Spotted at {time}Z",
+        {
+            < 60 => $"{minutes}m ago",
+            _ => $"{minutes / 60}h {minutes % 60}m ago",
         };
-        string text = $"{spot.Call.Text}  {kilohertz}\n{who}";
+    }
-        return spot.Comment.Trim().Length > 0 ? $"{text}\n{spot.Comment.Trim()}" : text;
+
+    /// Cluster lines end in bell and carriage-return characters, which a
+    /// tooltip draws as boxes, so control characters are dropped.
+    private static string Comment(string text)
+    {
+        string clean = new([.. text.Where(c => !char.IsControl(c))]);
+        clean = clean.Trim();
+        return clean.ToUpperInvariant() is "LSB" or "USB" or "SSB" ? "" : clean;
     }
 }

tests/Nonemm.Spotting.Tests/SpotDescriptionTests.cs

@@ -5,6 +5,7 @@ namespace Nonemm.Spotting.Tests;
 public class SpotDescriptionTests
 {
     private static readonly DateTime At = new(2026, 5, 30, 12, 1, 0, DateTimeKind.Utc);
+    private static readonly DateTime Now = At.AddMinutes(41);
 
     [Fact]
     public void ASpotNamesTheSpotterTheTimeAndTheComment()
@@ -13,15 +14,49 @@ public class SpotDescriptionTests
             Callsign.Parse("JA1XYZ"), Frequency.FromKilohertz(14_025), At, SpotSource.Cluster,
             "K1TTT", "CW 26 dB");
 
-        Assert.Equal("JA1XYZ  14025.0\nSpotted by K1TTT at 12:01Z\nCW 26 dB", SpotDescription.Of(spot));
+        Assert.Equal("14025.0 by K1TTT, 41m ago\nCW 26 dB", SpotDescription.Of(spot, Now));
     }
 
     [Fact]
-    public void ASpotWithoutACommentHasTwoLines()
+    public void ASpotWithoutACommentOrSpotterHasOneLine()
     {
         Spot spot = new(
             Callsign.Parse("JA1XYZ"), Frequency.FromKilohertz(14_025), At, SpotSource.Log);
 
-        Assert.Equal("JA1XYZ  14025.0\nWorked at 12:01Z", SpotDescription.Of(spot));
+        Assert.Equal("14025.0, 41m ago", SpotDescription.Of(spot, Now));
+    }
+
+    [Theory]
+    [InlineData("USB")]
+    [InlineData("lsb")]
+    [InlineData("SSB\a\a")]
+    public void ASidebandAloneIsLeftOut(string comment)
+    {
+        Spot spot = new(
+            Callsign.Parse("JA1XYZ"), Frequency.FromKilohertz(14_025), At, SpotSource.Cluster,
+            "K1TTT", comment);
+
+        Assert.Equal("14025.0 by K1TTT, 41m ago", SpotDescription.Of(spot, Now));
+    }
+
+    [Fact]
+    public void ControlCharactersAreDroppedFromTheComment()
+    {
+        Spot spot = new(
+            Callsign.Parse("JA1XYZ"), Frequency.FromKilohertz(14_025), At, SpotSource.Cluster,
+            "K1TTT", "CW 26 dB\r\a");
+
+        Assert.Equal("14025.0 by K1TTT, 41m ago\nCW 26 dB", SpotDescription.Of(spot, Now));
+    }
+
+    [Theory]
+    [InlineData(20, "14025.0, 0m ago")]
+    [InlineData(3600 + 300, "14025.0, 1h 5m ago")]
+    public void TheAgeIsInMinutesThenHours(int seconds, string expected)
+    {
+        Spot spot = new(
+            Callsign.Parse("JA1XYZ"), Frequency.FromKilohertz(14_025), At, SpotSource.Log);
+
+        Assert.Equal(expected, SpotDescription.Of(spot, At.AddSeconds(seconds)));
     }
 }