From 7fe950f98b8e57da4c2d97cad005e5fb10c843fe Mon Sep 17 00:00:00 2001
From: Paul Hebble <pjhebble@gmail.com>
Date: Mon, 13 Nov 2023 16:34:34 -0600
Subject: [PATCH] Modernize platform checks (requires .NET Framework 4.7.1+)

---
 Core/Platform.cs | 68 +++++++++++-------------------------------------
 1 file changed, 15 insertions(+), 53 deletions(-)

diff --git a/Core/Platform.cs b/Core/Platform.cs
index 360f47045c..b9e683a65a 100644
--- a/Core/Platform.cs
+++ b/Core/Platform.cs
@@ -24,21 +24,20 @@ static Platform()
         /// Are we on a Mac?
         /// </summary>
         /// <value><c>true</c> if is mac; otherwise, <c>false</c>.</value>
-        public static readonly bool IsMac = IsRunningOnMac();
+        public static readonly bool IsMac = RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
 
         /// <summary>
         /// Are we on a Unix (including Linux, but *not* Mac) system.
-        /// Note that Mono thinks Mac is Unix! So we need to negate Mac explicitly.
         /// </summary>
         /// <value><c>true</c> if is unix; otherwise, <c>false</c>.</value>
-        public static readonly bool IsUnix = Environment.OSVersion.Platform == PlatformID.Unix && !IsMac;
+        public static readonly bool IsUnix = RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
 
         /// <summary>
         /// Are we on a flavour of Windows? This is implemented internally by checking
         /// if we're not on Unix or Mac.
         /// </summary>
         /// <value><c>true</c> if is windows; otherwise, <c>false</c>.</value>
-        public static readonly bool IsWindows = !IsUnix && !IsMac;
+        public static readonly bool IsWindows = RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
 
         /// <summary>
         /// Are we on Mono?
@@ -53,40 +52,9 @@ static Platform()
         /// <summary>
         /// Are we running in an X11 environment?
         /// </summary>
-        public static readonly bool IsX11 = IsUnix && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("DISPLAY"));
-
-
-        // From https://github.com/mono/monodevelop/blob/master/main/src/core/Mono.Texteditor/Mono.TextEditor/Platform.cs
-        // Environment.OSVersion.Platform returns Unix for Mac OS X as of Mono v4.0.0:
-        // https://bugzilla.xamarin.com/show_bug.cgi?id=13345
-        // So we have to detect it another way
-        private static bool IsRunningOnMac()
-        {
-            IntPtr buf = IntPtr.Zero;
-            try
-            {
-                buf = Marshal.AllocHGlobal(8192);
-                // This is a hacktastic way of getting sysname from uname ()
-                if (uname(buf) == 0)
-                {
-                    string os = Marshal.PtrToStringAnsi(buf);
-                    if (os == "Darwin")
-                        return true;
-                }
-            }
-            catch
-            {
-            }
-            finally
-            {
-                if (buf != IntPtr.Zero)
-                    Marshal.FreeHGlobal(buf);
-            }
-            return false;
-        }
-
-        [DllImport("libc")]
-        private static extern int uname(IntPtr buf);
+        public static readonly bool IsX11 =
+            IsUnix
+            && !string.IsNullOrEmpty(Environment.GetEnvironmentVariable("DISPLAY"));
 
         private static bool IsOnMonoFourOrLater()
         {
@@ -94,25 +62,19 @@ private static bool IsOnMonoFourOrLater()
                 return false;
 
             // Get Mono's display name and parse the version
-            Type type = Type.GetType("Mono.Runtime");
             string display_name =
-                (string) type.GetMethod("GetDisplayName", BindingFlags.NonPublic | BindingFlags.Static).Invoke(null, null);
+                (string)Type.GetType("Mono.Runtime")
+                            .GetMethod("GetDisplayName",
+                                       BindingFlags.NonPublic | BindingFlags.Static)
+                            .Invoke(null, null);
 
             var match = versionMatcher.Match(display_name);
-            if (match.Success)
-            {
-                int majorVersion = Int32.Parse(match.Groups["majorVersion"].Value);
-                return majorVersion >= 4;
-            }
-            else
-            {
-                return false;
-            }
+            return match.Success
+                   && int.Parse(match.Groups["majorVersion"].Value) >= 4;
         }
 
-        private static readonly Regex versionMatcher = new Regex(
-            "^\\s*(?<majorVersion>\\d+)\\.\\d+\\.\\d+\\s*\\(",
-            RegexOptions.Compiled
-        );
+        private static readonly Regex versionMatcher =
+            new Regex("^\\s*(?<majorVersion>\\d+)\\.\\d+\\.\\d+\\s*\\(",
+                      RegexOptions.Compiled);
     }
 }