add cwd() function and fix some bugs

Makefile

@@ -6,7 +6,7 @@ OUTPUT:= preparse
 all test: debug
 	./$(OUTPUT) test.tex
 
-debug: CXXFLAGS:= -g
+debug: CXXFLAGS:= -g -std=c++11 -O0
 debug: $(OUTPUT)
 
 clean:

main.cpp

@@ -222,7 +222,7 @@ std::string Basedir(std::string path) {
 		it--;
 	}
 
-	return std::string(path.begin(), it+1);
+	return std::string(path.begin(), it);
 }
 
 std::string Name(std::string path) {
@@ -242,9 +242,39 @@ std::string Basename(std::string path) {
 		it--;
 	}
 
+	if (it == temp.begin()) {
+		return path;
+	}
+
 	return std::string(temp.begin(), it);
 }
 
+inline bool PathRelative(std::string path) {
+	return path.size() && path[0] != '/';
+}
+
+#include <unistd.h>
+
+std::string cwd() {
+	ssize_t size = 100, nsize;
+
+	while(1) {
+		char buffer[size];
+		if ((nsize = readlink("/proc/self/cwd", buffer, size)) < size) {
+			buffer[size+1] = 0;
+			return std::string(buffer);
+		}
+		size = nsize + 100;
+	}
+
+//
+//	buffer[rsize+1] = 0;
+//
+//	std::string result;
+//	result.assign(buffer);
+//	return result;
+}
+
 #include <fstream>
 
 bool Exists(std::string path) {
@@ -285,9 +315,11 @@ InputExtractor::List Include(std::string path) {
 
 	std::string basedir = Basedir(path);
 	list = InputExtractor()(str);
-	// add basedir to list
+
+	// add basedir to list for all relative paths
 	for (auto it = list.begin(); it != list.end(); it++) {
-		*it = basedir + '/' + *it;
+		if (PathRelative(*it))
+			*it = basedir + '/' + *it;
 	}
 	// cleanup
 	munmap(memptr, fileinfo.st_size);
@@ -368,9 +400,11 @@ InputExtractor::List InputExtractor::operator()(const Substring &input){
 	return result;
 }
 
+#include <experimental/filesystem>
+
 int main(int argc, char ** args) {
 	// find all the files the given tex files depend on
-
+	cout << cwd() << std::endl;
 	int fd = 0;
 	struct stat filestat;
 
@@ -407,8 +441,20 @@ int main(int argc, char ** args) {
 				std::cout << "could not create output file" << std::endl;
 			} else {
 				output << "filename: ";
+
 				for (auto it = list.begin(); it != list.end(); it++) {
-					output << *it << "\\\\\n";
+					output << '\t';
+					if (PathRelative(*it))  {
+						if (PathRelative(filename)) {
+							output << cwd();
+						} else {
+							output << Basename(filename);
+						}
+						output << "/" << *it;
+					} else {
+						output << *it;
+					}
+					output << "\\\\\n";
 				}
 				output << endl;
 			}