MacOSでmemory_pressureコマンドを使用してメモリ容量を取得するようにした

src/Beutl.Configuration/EditorConfig.cs

@@ -4,7 +4,7 @@
 using System.Reflection;
 using System.Runtime.Loader;
 using System.Runtime.Versioning;
-
+using System.Text.RegularExpressions;
 using Beutl.Collections;
 using Beutl.Serialization;
 
@@ -34,7 +34,7 @@ public enum FrameCacheConfigColorType
     YUV
 }
 
-public sealed class EditorConfig : ConfigurationBase
+public sealed partial class EditorConfig : ConfigurationBase
 {
     public static readonly CoreProperty<bool> AutoAdjustSceneDurationProperty;
     public static readonly CoreProperty<bool> EnablePointerLockInPropertyProperty;
@@ -67,6 +67,7 @@ static EditorConfig()
 
         ulong memSize = OperatingSystem.IsWindows() ? GetWindowsMemoryCapacity()
             : OperatingSystem.IsLinux() ? GetLinuxMemoryCapacity()
+            : OperatingSystem.IsMacOS() ? GetMacMemoryCapacity()
             : 1024 * 1024 * 1024;
         double memSizeInMG = memSize / (1024d * 1024d);
 
@@ -248,4 +249,28 @@ private static ulong GetLinuxMemoryCapacity()
         // https://help.ubuntu.com/community/Installation/SystemRequirements
         return 4L * 1024 * 1024 * 1024;
     }
+
+    private static ulong GetMacMemoryCapacity()
+    {
+        var startInfo = new ProcessStartInfo("/usr/bin/memory_pressure", "-Q")
+        {
+            RedirectStandardOutput = true
+        };
+        var proc = Process.Start(startInfo);
+        if (proc != null)
+        {
+            proc.WaitForExit();
+            string? str = proc.StandardOutput.ReadLine();
+            Regex regex = NumberRegex();
+            if (str != null && regex.Match(str) is { Success: true } match)
+            {
+                return ulong.Parse(match.Value);
+            }
+        }
+
+        return 4L * 1024 * 1024 * 1024;
+    }
+
+    [GeneratedRegex(@"(\d+)")]
+    private static partial Regex NumberRegex();
 }