Fix problem with __import not working (#688)

* Added getPathType to ISlangFileSystemExt.
This is needed so that when searching for a file it's existance can be tested without loading the file. On some platforms a getCanonicalPath can do this - but depending on how getCanonicalPath is implemented, it may not do. This test is made after the relative path is produced before finding the canonical path.

* Test for importing along search path.

* Added comment to explain the issue around WrapFileSystem impl of getPathType.

* Make search path use / not \

1 files changed, 7 insertions, 0 deletions

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index 5461afbf7..996f8e32f 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -118,6 +118,13 @@ struct IncludeHandlerImpl : IncludeHandler
             return SLANG_FAIL;
         }
      
+        SlangPathType pathType;
+        SLANG_RETURN_ON_FAIL(fileSystemExt->getPathType(relPath.begin(), &pathType));
+        if (pathType != SLANG_PATH_TYPE_FILE)
+        {
+            return SLANG_E_NOT_FOUND;
+        }
+
         // Get the canonical path
         ComPtr<ISlangBlob> canonicalPathBlob;
         SLANG_RETURN_ON_FAIL(fileSystemExt->getCanoncialPath(relPath.begin(), canonicalPathBlob.writeRef()));