Setting the correct work directory in FunctionExternalCommand

* changed the XObjectValue constructor to accept a pointer to FilesystemContext instead of instantiating the context by itself
* the FilesystemContext is now instantiated in the "callConstructDocument" member method of "FunctionBase"
** a const reference to FilesystemContext is passed to all "constructDocument" member method implementations
* the FilesystemContext is currently only used by FunctionExternal command to set the correct work directory in "boost::process::context"
** this is required so calling external commands from inside a stylesheet works as expected
*** i.e. from inside the directory the stylesheet is located in
* modified all remaining external function implementations accordingly

1 files changed, 3 insertions, 1 deletions

diff --git a/src/function/read_file.h b/src/function/read_file.h
index b26bc6a..e5233e7 100644
--- a/src/function/read_file.h
+++ b/src/function/read_file.h
@@ -18,7 +18,9 @@ class FunctionReadFile : public FunctionBase<
 		friend FunctionBase;
 
 		DomDocumentCache::document_ptr constructDocument(
-			boost::filesystem::path) const;
+			const FilesystemContext&,
+			boost::filesystem::path
+		) const;
 
 };