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, 4 insertions, 0 deletions

diff --git a/src/function/external_command.cc b/src/function/external_command.cc
index 7d91a9a..3819a43 100644
--- a/src/function/external_command.cc
+++ b/src/function/external_command.cc
@@ -40,6 +40,7 @@ inline xercesc::DOMNode* importDocumentElement(
 namespace InputXSLT {
 
 DomDocumentCache::document_ptr FunctionExternalCommand::constructDocument(
+	const FilesystemContext&     fsContext,
 	std::string                  command,
 	boost::optional<std::string> input
 ) const {
@@ -51,6 +52,9 @@ DomDocumentCache::document_ptr FunctionExternalCommand::constructDocument(
 	context.environment     = boost::process::self::get_environment(); 
 	context.stdout_behavior = boost::process::capture_stream();
 	context.stdin_behavior  = boost::process::capture_stream();
+	context.work_directory  = boost::filesystem::canonical(
+		fsContext.getBase().parent_path()
+	).string();
 
 	boost::process::child commandProcess(
 		boost::process::launch_shell(command, context)