1 files changed, 20 insertions, 0 deletions
diff --git a/src/Godosa.Core/Diagnostics/DebugFlags.cs b/src/Godosa.Core/Diagnostics/DebugFlags.cs
new file mode 100644
index 0000000..27b63bf
--- /dev/null
+++ b/src/Godosa.Core/Diagnostics/DebugFlags.cs
@@ -0,0 +1,20 @@
+namespace Godosa.Core.Diagnostics;
+
+/// <summary>Opt-in debug categories from one environment value: a comma list,
+/// case-insensitive; <c>all</c> turns on every category but not <see cref="Exact"/>
+/// switches (perf experiments like <c>nohud</c>).</summary>
+public sealed class DebugFlags
+{
+    private readonly string[] _names;
+
+    public DebugFlags(string? value) =>
+        _names = (value ?? "").Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+    public bool On(string category) =>
+        Array.Exists(_names, n =>
+            n.Equals(category, StringComparison.OrdinalIgnoreCase) ||
+            n.Equals("all", StringComparison.OrdinalIgnoreCase));
+
+    public bool Exact(string name) =>
+        Array.Exists(_names, n => n.Equals(name, StringComparison.OrdinalIgnoreCase));
+}