feat: show bot version on startup and in /catalogger ping

Catalogger.Backend/BuildInfo.cs

@@ -0,0 +1,46 @@
+// Copyright (C) 2021-present sam (starshines.gay)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace Catalogger.Backend;
+
+public static class BuildInfo
+{
+    public static string Hash { get; private set; } = "(unknown)";
+    public static string Version { get; private set; } = "(unknown)";
+
+    public static async Task ReadBuildInfo()
+    {
+        await using var stream = typeof(BuildInfo).Assembly.GetManifestResourceStream("version");
+        if (stream == null)
+            return;
+
+        using var reader = new StreamReader(stream);
+        var data = (await reader.ReadToEndAsync()).Trim().Split("\n");
+        if (data.Length < 3)
+            return;
+
+        Hash = data[0];
+        var dirty = data[2] == "dirty";
+
+        var versionData = data[1].Split("-");
+        if (versionData.Length < 3)
+            return;
+        Version = versionData[0];
+        if (versionData[1] != "0" || dirty)
+            Version += $"+{versionData[2]}";
+        if (dirty)
+            Version += ".dirty";
+    }
+}