fix makefile output, ignore empty paths

main.cpp

@@ -333,6 +333,7 @@ InputExtractor::List InputExtractor::operator()(const Substring &input){
 	CommandList IncludeCommands;
 
 	IncludeCommands["input"] = [](List &l, std::string a) {
+		if (a.empty()) return;
 		if (Extension(a) != ".tex") a += ".tex";
 		l.push_back(a);
 		// try to extract all inputs of that file
@@ -440,7 +441,7 @@ int main(int argc, char ** args) {
 			if (!output) {
 				std::cout << "could not create output file" << std::endl;
 			} else {
-				output << "filename: ";
+				output << filename << ": ";
 
 				for (auto it = list.begin(); it != list.end(); it++) {
 					output << '\t';
@@ -454,7 +455,7 @@ int main(int argc, char ** args) {
 					} else {
 						output << *it;
 					}
-					output << "\\\\\n";
+					output << "\t\\\n";
 				}
 				output << endl;
 			}