feature: try to read PATH from zsh

src/Native/MacOS.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Runtime.Versioning;
+using System.Text;
 
 using Avalonia;
 
@@ -17,6 +18,31 @@ namespace SourceGit.Native
             {
                 DisableDefaultApplicationMenuItems = true,
             });
+
+            {
+                var startInfo = new ProcessStartInfo();
+                startInfo.FileName = "zsh";
+                startInfo.Arguments = "--login -c \"echo $PATH\"";
+                startInfo.UseShellExecute = false;
+                startInfo.CreateNoWindow = true;
+                startInfo.RedirectStandardOutput = true;
+                startInfo.StandardOutputEncoding = Encoding.UTF8;
+            
+                try
+                {
+                    var proc = new Process() { StartInfo = startInfo };
+                    proc.Start();
+                    var pathData = proc.StandardOutput.ReadToEnd();
+                    proc.WaitForExit();
+                    if (proc.ExitCode == 0)
+                        Environment.SetEnvironmentVariable("PATH", pathData);
+                    proc.Close();
+                }
+                catch
+                {
+                    // Ignore error.
+                }
+            }
         }
 
         public string FindGitExecutable()