diff --git a/src/parser.cpp b/src/parser.cpp
index 2a5246a..f32efa5 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -320,12 +320,13 @@ namespace /* internal */
 }
 
 
-Tree parseTftFile(MappedFile file)
+Tree parseTftFile(fd_t file)
 {
 	Tree result("name");
 	cur_tree = &result;
 
-	alloced preprocessed = preprocess(file);
+	MappedFile mapedfile = mapfile(file);
+	alloced preprocessed = preprocess(mapedfile);
 
 	state_neutral(preprocessed.data);
 
diff --git a/src/parser.hpp b/src/parser.hpp
index 7ce9e19..dcbc83c 100644
--- a/src/parser.hpp
+++ b/src/parser.hpp
@@ -1,3 +1,3 @@
 #include "tree.hpp"
 
-Tree parseTftFile(MappedFile file);
+Tree parseTftFile(fd_t);
diff --git a/src/tft.cpp b/src/tft.cpp
index 0225f7d..5f73ad2 100644
--- a/src/tft.cpp
+++ b/src/tft.cpp
@@ -3,16 +3,35 @@
 #include "tree.hpp"
 #include "utils.hpp"
 #include "parser.hpp"
+#include <string_view>
 
-
+using std::string_view;
 /* using std::cin; */
 /* using std::cout; */
+using std::cerr;
+using namespace std::literals;
+
 int main(int argc, char* argv[])
 {
 	init();
 
-	auto f = mapfile("example_tree.tft");
-	parseTftFile(f).display();
+	if(argc < 2)
+	{
+		cerr << "Usage: tft FILES...\nTry 'tft --help' for more information";
+		return 1;
+	}
+
+	for(int i = 1; i < argc; ++i)
+	{
+		if(string_view(argv[i]) == "--help"sv) /* sv worth it? */
+		{
+			/* todo */
+			return 0;			/* todo exit curses */
+		}
+
+		fd_t file = openOrDie(argv[i]);
+		parseTftFile(file).display();
+	}
 
 	Tree test1("Dechkovi");
 	/* test1.loadFromFile(); */
diff --git a/src/utils.cpp b/src/utils.cpp
index 9317196..02abff1 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -4,6 +4,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/mman.h>
+#include <iostream>
 
 void init()
 {
@@ -25,10 +26,8 @@ void init()
 	wnoutrefresh(stdscr);					/* if not present the first real refresh is missed */
 }
 
-MappedFile mapfile(const char* path)
+MappedFile mapfile(fd_t file)
 {
-	int file = open(path, O_RDONLY);
-
 	MappedFile res;
 	res.len = lseek(file, 0, SEEK_END);
 	res.data = (char*)mmap(nullptr, res.len, PROT_READ, MAP_PRIVATE, file, 0);
@@ -37,6 +36,18 @@ MappedFile mapfile(const char* path)
 	return res;
 }
 
+fd_t openOrDie(const char* path)
+{
+	fd_t file = open(path, O_RDONLY);
+	if(file == -1)
+	{
+		std::cerr << "Can't open: " << path << '\n';
+		exit(1);
+	}
+	return file;
+}
+
+
 bool willBeVisible(I16 drawY, I16 drawX, U16 height, U16 width)
 {
 	return (drawY + height > 0) && (drawX + width > 0) &&
diff --git a/src/utils.hpp b/src/utils.hpp
index be8785c..4d40c5b 100644
--- a/src/utils.hpp
+++ b/src/utils.hpp
@@ -23,15 +23,18 @@
 /* 	return lhs; */
 /* } */
 
-void init();
-
+using fd_t = int;				/* file descriptor */
 struct MappedFile
 {
 	char* data;
 	unsigned len;
 };
 
-MappedFile mapfile(const char* path);
+void init();
+
+
+MappedFile mapfile(fd_t);
+fd_t openOrDie(const char* path);
 
 template <class Vec>
 void remove(Vec& vec, size_t pos) /* Remove from vector by moving the last element in its place */