Extracted Windows kits toolchain code into its own method.

src/Core/Toolchains/MSVCToolchain.cs

@@ -132,8 +132,8 @@ namespace CppSharp
             return vsSdk;
         }
 
-        /// Gets the system include folders for the given Visual Studio version.
-        public static List<string> GetSystemIncludes(VisualStudioVersion vsVersion)
+        public static ToolchainVersion GetWindowsKitsToolchain(VisualStudioVersion vsVersion,
+            out int windowsSdkMajorVer)
         {
             var vsSdk = GetVSToolchain(vsVersion);
 
@@ -141,39 +141,21 @@ namespace CppSharp
             vsDir = vsDir.Substring(0, vsDir.LastIndexOf(@"\Common7\IDE",
                 StringComparison.Ordinal));
 
-            var includes = new List<string>();
-            includes.Add(Path.Combine(vsDir, @"VC\include"));
-
             // Check VCVarsQueryRegistry.bat to see which Windows SDK version
             // is supposed to be used with this VS version.
             var vcVarsPath = Path.Combine(vsDir, @"Common7\Tools\VCVarsQueryRegistry.bat");
 
-            int windowsSdkMajorVer = 0;
+            windowsSdkMajorVer = 0;
             string kitsRootKey = string.Empty;
-            if (File.Exists(vcVarsPath))
-            {
-                var vcVarsFile = File.ReadAllText(vcVarsPath);
-                var match = Regex.Match(vcVarsFile, @"Windows\\v([1-9][0-9]*)\.?([0-9]*)");
-                if (match.Success)
-                    windowsSdkMajorVer = int.Parse(match.Groups[1].Value);
 
-                match = Regex.Match(vcVarsFile, @"KitsRoot([1-9][0-9]*)");
-                if (match.Success)
-                    kitsRootKey = match.Groups[0].Value;
-            }
+            var vcVarsFile = File.ReadAllText(vcVarsPath);
+            var match = Regex.Match(vcVarsFile, @"Windows\\v([1-9][0-9]*)\.?([0-9]*)");
+            if (match.Success)
+                windowsSdkMajorVer = int.Parse(match.Groups[1].Value);
 
-            List<ToolchainVersion> windowsSdks;
-            GetWindowsSdks(out windowsSdks);
-
-            // Older Visual Studio versions provide their own Windows SDK.
-            if (windowsSdks.Count == 0)
-            {
-                includes.Add(Path.Combine(vsDir, @"\VC\PlatformSDK\Include"));
-            }
-            else
-            {
-                includes.AddRange(GetIncludeDirsFromWindowsSdks(windowsSdkMajorVer, windowsSdks));
-            }
+            match = Regex.Match(vcVarsFile, @"KitsRoot([1-9][0-9]*)");
+            if (match.Success)
+                kitsRootKey = match.Groups[0].Value;
 
             List<ToolchainVersion> windowsKitsSdks;
             GetWindowsKitsSdks(out windowsKitsSdks);
@@ -187,6 +169,37 @@ namespace CppSharp
             if (windowsKitSdk.Value == null)
                 windowsKitSdk = windowsKitsSdks.Last();
 
+            return windowsKitSdk;
+        }
+
+        /// Gets the system include folders for the given Visual Studio version.
+        public static List<string> GetSystemIncludes(VisualStudioVersion vsVersion)
+        {
+            var vsSdk = GetVSToolchain(vsVersion);
+
+            int windowsSdkMajorVer;
+            var windowsKitSdk = GetWindowsKitsToolchain(vsVersion, out windowsSdkMajorVer);
+
+            var vsDir = vsSdk.Directory;
+            vsDir = vsDir.Substring(0, vsDir.LastIndexOf(@"\Common7\IDE",
+                StringComparison.Ordinal));
+
+            var includes = new List<string>();
+            includes.Add(Path.Combine(vsDir, @"VC\include"));
+
+            List<ToolchainVersion> windowsSdks;
+            GetWindowsSdks(out windowsSdks);
+
+            // Older Visual Studio versions provide their own Windows SDK.
+            if (windowsSdks.Count == 0)
+            {
+                includes.Add(Path.Combine(vsDir, @"\VC\PlatformSDK\Include"));
+            }
+            else
+            {
+                includes.AddRange(GetIncludeDirsFromWindowsSdks(windowsSdkMajorVer, windowsSdks));
+            }
+
             includes.AddRange(
                 CollectUniversalCRuntimeIncludeDirs(vsDir, windowsKitSdk, windowsSdkMajorVer));