Add H for help in keyboard mode

Co-authored-by: openhands <openhands@all-hands.dev>

README.md

@@ -53,8 +53,8 @@ Rows are numbered `1..N` down the left, columns are lettered `A..Z` (then `AA..`
 | `help` / `?` | list the commands |
 | `quit` / `q` | leave |
 
-In `--keys` mode: arrows move, `Enter`/`Space` reveals, `F` flags, `C` chords, `1`/`2`/`3` change
-difficulty, `N` starts a new board, `Q` or `Esc` quits.
+In `--keys` mode: arrows move, `Enter`/`Space` reveals, `F` flags, `C` chords, `H` shows help,
+`1`/`2`/`3` change difficulty, `N` starts a new board, `Q` or `Esc` quits.
 
 Colours are on when writing to a terminal and off when the output is redirected; set `NO_COLOR`
 to force them off. The process exits `0` after a win, `1` otherwise.

src/Minesweeper.Cli/CommandParser.cs

@@ -54,6 +54,7 @@ public static class CommandParser
         ConsoleKey.F => new Command.FlagAtCursor(),
         ConsoleKey.C => new Command.ChordAtCursor(),
         ConsoleKey.N => new Command.NewGame(),
+        ConsoleKey.H => new Command.ShowHelp(),
         ConsoleKey.D1 => new Command.ChangeDifficulty(GameDifficulty.Beginner),
         ConsoleKey.D2 => new Command.ChangeDifficulty(GameDifficulty.Intermediate),
         ConsoleKey.D3 => new Command.ChangeDifficulty(GameDifficulty.Expert),

src/Minesweeper.Cli/GameSession.cs

@@ -92,7 +92,7 @@ public sealed class GameSession
           quit | q         leave
 
         Rows are numbered 1..N down the left, columns are lettered A..Z across the top.
-        With --keys, use the arrow keys to move, Enter/Space to reveal, F to flag, C to chord.
+        With --keys, use the arrow keys to move, Enter/Space to reveal, F to flag, C to chord, H for help.
         """;
 
     private static MinesweeperGame NewGame(GameDifficulty difficulty, int? seed) =>

src/Minesweeper.Cli/Program.cs

@@ -87,7 +87,7 @@ public static class Program
         }
         else if (keys)
         {
-            Console.WriteLine(palette.Dim("arrows move · enter reveal · f flag · c chord · 1/2/3 difficulty · n new · q quit"));
+            Console.WriteLine(palette.Dim("arrows move · enter reveal · f flag · c chord · 1/2/3 difficulty · n new · h help · q quit"));
         }
         else
         {

tests/Minesweeper.Core.Tests/CommandParserTests.cs

@@ -178,6 +178,10 @@ public class CommandParserTests
         Assert.IsType<Command.Quit>(CommandParser.FromKey(Key(ConsoleKey.Q, 'q')));
     }
 
+    [Fact]
+    public void FromKey_Help() =>
+        Assert.IsType<Command.ShowHelp>(CommandParser.FromKey(Key(ConsoleKey.H, 'h')));
+
     [Fact]
     public void FromKey_UnmappedKey_IsANoOp() =>
         Assert.IsType<Command.Noop>(CommandParser.FromKey(Key(ConsoleKey.B, 'b')));