From f91416d9acabb76f6efcdc2d09835d04cd98c881 Mon Sep 17 00:00:00 2001
From: Ignacio Etcheverry <ignalfonsore@gmail.com>
Date: Thu, 21 Nov 2019 15:08:52 +0100
Subject: C#: Fix PathWhich on Windows when name already has extension

Also make the Posix version of PathWhich check if the file has executable access.
---
 .../editor/GodotTools/GodotTools/GodotTools.csproj |  1 +
 .../mono/editor/GodotTools/GodotTools/Utils/OS.cs  | 86 ++++++++++++----------
 2 files changed, 50 insertions(+), 37 deletions(-)

diff --git a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
index d0c78d095b..fb2cbabc8e 100644
--- a/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
+++ b/modules/mono/editor/GodotTools/GodotTools/GodotTools.csproj
@@ -30,6 +30,7 @@
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="Mono.Posix" />
     <Reference Include="System" />
     <Reference Include="GodotSharp">
       <HintPath>$(GodotSourceRootPath)/bin/GodotSharp/Api/$(GodotApiConfiguration)/GodotSharp.dll</HintPath>
diff --git a/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs b/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
index 21ee85f2a9..1a8c26acd7 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
@@ -5,6 +5,7 @@ using System.Diagnostics.CodeAnalysis;
 using System.IO;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using Mono.Unix.Native;
 
 namespace GodotTools.Utils
 {
@@ -55,21 +56,23 @@ namespace GodotTools.Utils
             return name.Equals(GetPlatformName(), StringComparison.OrdinalIgnoreCase);
         }
 
-        public static bool IsWindows => IsOS(Names.Windows);
-
-        public static bool IsOSX => IsOS(Names.OSX);
-
-        public static bool IsX11 => IsOS(Names.X11);
-
-        public static bool IsServer => IsOS(Names.Server);
-
-        public static bool IsUWP => IsOS(Names.UWP);
-
-        public static bool IsHaiku => IsOS(Names.Haiku);
-
-        public static bool IsAndroid => IsOS(Names.Android);
-
-        public static bool IsHTML5 => IsOS(Names.HTML5);
+        private static readonly Lazy<bool> _isWindows = new Lazy<bool>(() => IsOS(Names.Windows));
+        private static readonly Lazy<bool> _isOSX = new Lazy<bool>(() => IsOS(Names.OSX));
+        private static readonly Lazy<bool> _isX11 = new Lazy<bool>(() => IsOS(Names.X11));
+        private static readonly Lazy<bool> _isServer = new Lazy<bool>(() => IsOS(Names.Server));
+        private static readonly Lazy<bool> _isUWP = new Lazy<bool>(() => IsOS(Names.UWP));
+        private static readonly Lazy<bool> _isHaiku = new Lazy<bool>(() => IsOS(Names.Haiku));
+        private static readonly Lazy<bool> _isAndroid = new Lazy<bool>(() => IsOS(Names.Android));
+        private static readonly Lazy<bool> _isHTML5 = new Lazy<bool>(() => IsOS(Names.HTML5));
+
+        public static bool IsWindows => _isWindows.Value;
+        public static bool IsOSX => _isOSX.Value;
+        public static bool IsX11 => _isX11.Value;
+        public static bool IsServer => _isServer.Value;
+        public static bool IsUWP => _isUWP.Value;
+        public static bool IsHaiku => _isHaiku.Value;
+        public static bool IsAndroid => _isAndroid.Value;
+        public static bool IsHTML5 => _isHTML5.Value;
 
         private static bool? _isUnixCache;
         private static readonly string[] UnixLikePlatforms = {Names.OSX, Names.X11, Names.Server, Names.Haiku, Names.Android};
@@ -88,7 +91,12 @@ namespace GodotTools.Utils
 
         public static string PathWhich(string name)
         {
-            string[] windowsExts = IsWindows ? Environment.GetEnvironmentVariable("PATHEXT")?.Split(PathSep) : null;
+            return IsWindows ? PathWhichWindows(name) : PathWhichUnix(name);
+        }
+
+        private static string PathWhichWindows(string name)
+        {
+            string[] windowsExts = Environment.GetEnvironmentVariable("PATHEXT")?.Split(PathSep) ?? new string[] { };
             string[] pathDirs = Environment.GetEnvironmentVariable("PATH")?.Split(PathSep);
 
             var searchDirs = new List<string>();
@@ -96,30 +104,34 @@ namespace GodotTools.Utils
             if (pathDirs != null)
                 searchDirs.AddRange(pathDirs);
 
+            string nameExt = Path.GetExtension(name);
+            bool hasPathExt = string.IsNullOrEmpty(nameExt) || windowsExts.Contains(nameExt, StringComparer.OrdinalIgnoreCase);
+
             searchDirs.Add(System.IO.Directory.GetCurrentDirectory()); // last in the list
 
-            foreach (var dir in searchDirs)
-            {
-                string path = Path.Combine(dir, name);
-
-                if (IsWindows && windowsExts != null)
-                {
-                    foreach (var extension in windowsExts)
-                    {
-                        string pathWithExtension = path + extension;
-
-                        if (File.Exists(pathWithExtension))
-                            return pathWithExtension;
-                    }
-                }
-                else
-                {
-                    if (File.Exists(path))
-                        return path;
-                }
-            }
+            if (hasPathExt)
+                return searchDirs.Select(dir => Path.Combine(dir, name)).FirstOrDefault(File.Exists);
+
+            return (from dir in searchDirs
+                select Path.Combine(dir, name)
+                into path
+                from ext in windowsExts
+                select path + ext).FirstOrDefault(File.Exists);
+        }
+
+        private static string PathWhichUnix(string name)
+        {
+            string[] pathDirs = Environment.GetEnvironmentVariable("PATH")?.Split(PathSep);
+
+            var searchDirs = new List<string>();
+
+            if (pathDirs != null)
+                searchDirs.AddRange(pathDirs);
+
+            searchDirs.Add(System.IO.Directory.GetCurrentDirectory()); // last in the list
 
-            return null;
+            return searchDirs.Select(dir => Path.Combine(dir, name))
+                .FirstOrDefault(path => File.Exists(path) && Syscall.access(path, AccessModes.X_OK) == 0);
         }
 
         public static void RunProcess(string command, IEnumerable<string> arguments)
-- 
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