godosa-engine: initial public history

1 files changed, 13 insertions, 0 deletions

diff --git a/src/Godosa.Core/Runs/DigestLine.cs b/src/Godosa.Core/Runs/DigestLine.cs
new file mode 100644
index 0000000..bc4519b
--- /dev/null
+++ b/src/Godosa.Core/Runs/DigestLine.cs
@@ -0,0 +1,13 @@
+using System.Globalization;
+
+namespace Godosa.Core.Runs;
+
+/// <summary>The shared digest stdout line: <c>digest &lt;frame&gt; &lt;game seconds 0.###&gt; &lt;16 hex&gt;</c>.</summary>
+public static class DigestLine
+{
+    public static string Format(long frame, double gameSeconds, ulong hash) =>
+        string.Create(CultureInfo.InvariantCulture, $"digest {frame} {gameSeconds:0.###} {hash:x16}");
+
+    /// <summary>Every <paramref name="every"/> frames (frame 0 and every ≤ 0 never).</summary>
+    public static bool Due(long frame, int every) => every > 0 && frame > 0 && frame % every == 0;
+}