diff --git a/CMakeLists.txt b/CMakeLists.txt
index 386ef46..18827b4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ link_directories(libft) # libraries
 
 set(SOURCE_FILES
         src/main.c
-		) # sources
+        src/ft_ls.c src/parse_input.c src/flags.c src/sort.c src/output.c libft/ft_lst_merge_sort.c) # sources
 
 add_executable(ft_ls ${SOURCE_FILES}) # compilation
 
diff --git a/libft/ft_lst_merge_sort.c b/libft/ft_lst_merge_sort.c
new file mode 100644
index 0000000..45054a1
--- /dev/null
+++ b/libft/ft_lst_merge_sort.c
@@ -0,0 +1,75 @@
+#include "libft.h"
+
+t_list	*SortedMerge(t_list *a, t_list *b)
+{
+	t_list	*result;
+
+	result = NULL;
+
+	if (a == NULL)
+		return(b);
+	else if (b==NULL)
+		return(a);
+
+	/* Pick either a or b, and recur */
+	if (a->data <= b->data)
+	{
+		result = a;
+		result->next = SortedMerge(a->next, b);
+	}
+	else
+	{
+		result = b;
+		result->next = SortedMerge(a, b->next);
+	}
+	return(result);
+}
+
+void	split(t_list *source, t_list **front_ptr, t_list **back_ptr)
+{
+	t_list *fast;
+	t_list *slow;
+
+	if (source==NULL || source->next==NULL)
+	{
+		*front_ptr = source;
+		*back_ptr = NULL;
+	}
+	else
+	{
+		slow = source;
+		fast = source->next;
+		while (fast != NULL)
+		{
+			fast = fast->next;
+			if (fast != NULL)
+			{
+				slow = slow->next;
+				fast = fast->next;
+			}
+		}
+
+		*front_ptr = source;
+		*back_ptr = slow->next;
+		slow->next = NULL;
+	}
+}
+void	ft_lst_merge_sort(t_list **head_ptr, int (*cmp)())
+{
+	t_list	*head;
+	t_list	*a;
+	t_list	*b;
+
+	head = *head_ptr;
+	if ((head == NULL) || (head->next == NULL))
+		return;
+
+	split(head, &a, &b);
+
+	/* Recursively sort the sublists */
+	ft_lst_merge_sort(&a, cmp);
+	ft_lst_merge_sort(&b, cmp);
+
+	/* answer = merge the two sorted lists together */
+	*head_ptr = SortedMerge(a, b);
+}
diff --git a/src/flags.c b/src/flags.c
new file mode 100644
index 0000000..9abb3f1
--- /dev/null
+++ b/src/flags.c
@@ -0,0 +1,22 @@
+#include "ft_ls.h"
+
+void	set_flags_to_zero(t_flags *flgs)
+{
+	flgs->a = 0;
+	flgs->l = 0;
+	flgs->R = 0;
+	flgs->t = 0;
+	flgs->col = 0;
+}
+
+int		chck_flgs(char *flg, t_flags *flgs)
+{
+	if ((!*(flg + 1)) && (flg += 1))
+		return (1);
+	if (flgs->l == 0) flgs->l = (ft_strchr(flg, 'l') != NULL) ? 1 : 0;
+	if (flgs->a == 0) flgs->a = (ft_strchr(flg, 'a') != NULL) ? 1 : 0;
+	if (flgs->R == 0) flgs->R = (ft_strchr(flg, 'R') != NULL) ? 1 : 0;
+	if (flgs->t == 0) flgs->t = (ft_strchr(flg, 't') != NULL) ? 1 : 0;
+	if (flgs->col == 0) flgs->col = (ft_strchr(flg, '1') != NULL) ? 1 : 0;
+	return (0);
+}
\ No newline at end of file
diff --git a/src/ft_ls.c b/src/ft_ls.c
new file mode 100644
index 0000000..3419495
--- /dev/null
+++ b/src/ft_ls.c
@@ -0,0 +1,47 @@
+#include "ft_ls.h"
+
+void	put_error(char *arg)
+{
+	char 	*final_str;
+	char 	*arg_colon_errno;
+	char 	*colon_errno;
+
+	colon_errno = ft_strjoin(": ", strerror(errno));
+	arg_colon_errno = ft_strjoin(arg, colon_errno);
+	final_str = ft_strjoin("ls: ", arg_colon_errno);
+	ft_putstr(final_str);
+	ft_putstr("\n");
+	free(final_str);
+	free(arg_colon_errno);
+	free(colon_errno);
+}
+
+void	init_dir_ent_list(DIR *dp, t_list **del, t_flags *flgs)
+{
+	t_dir_entity	de;
+
+
+	while ((de.dirent = readdir(dp)) && (de.flags = flgs))
+		ft_lstadd(del, ft_lstnew(&de, sizeof(t_dir_entity)));
+}
+
+void	ft_ls(char *path, t_flags *flgs)
+{
+	DIR				*dp;
+//	int 			blocks;
+//	char 			*tmp_path;
+	t_list			*dir_ent_list;
+
+//	tmp_path = 0;
+//	blocks = 0;
+	dir_ent_list = NULL;
+	if (!(dp = opendir(path)) || open(path, O_RDONLY) == -1)
+		put_error(path);
+	else
+	{
+		init_dir_ent_list(dp, &dir_ent_list, flgs);
+		sort(dir_ent_list, flgs);
+		output(dir_ent_list);
+	}
+
+}
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 31d768e..7c7eb92 100644
--- a/src/main.c
+++ b/src/main.c
@@ -12,114 +12,6 @@
 
 #include "ft_ls.h"
 
-void	put_error(char *arg)
-{
-	char 	*final_str;
-	char 	*arg_colon_errno;
-	char 	*colon_errno;
-
-	colon_errno = ft_strjoin(": ", strerror(errno));
-	arg_colon_errno = ft_strjoin(arg, colon_errno);
-	final_str = ft_strjoin("ls: ", arg_colon_errno);
-	ft_putstr(final_str);
-	ft_putstr("\n");
-	free(final_str);
-	free(arg_colon_errno);
-	free(colon_errno);
-}
-
-int		chck_flgs(char *flg, t_flags *flgs)
-{
-	if ((!*(flg + 1)) && (flg += 1))
-		return (1);
-	if (flgs->l == 0) flgs->l = (ft_strchr(flg, 'l') != NULL) ? 1 : 0;
-	if (flgs->a == 0) flgs->a = (ft_strchr(flg, 'a') != NULL) ? 1 : 0;
-	if (flgs->R == 0) flgs->R = (ft_strchr(flg, 'R') != NULL) ? 1 : 0;
-	if (flgs->t == 0) flgs->t = (ft_strchr(flg, 't') != NULL) ? 1 : 0;
-	if (flgs->col == 0) flgs->col = (ft_strchr(flg, '1') != NULL) ? 1 : 0;
-	return (0);
-}
-
-void	init_dir_ent_list(DIR *dp, t_list **del, t_flags *flgs)
-{
-	t_dir_entity	de;
-
-
-	while ((de.dirent = readdir(dp)) && (de.flags = flgs))
-		ft_lstadd(del, ft_lstnew(&de, sizeof(t_dir_entity)));
-}
-
-void	column_out(t_list *entity)
-{
-	t_dir_entity *d_ent;
-
-	d_ent = (t_dir_entity *)entity->content;
-	if (d_ent->flags->a)
-		printf("%s\t", d_ent->dirent->d_name);
-	else
-		if (*d_ent->dirent->d_name != '.')
-			printf("%s\t\n", d_ent->dirent->d_name);
-}
-
-void	output(t_list *del)
-{
-	ft_lstiter(del, column_out);
-}
-
-void	ft_ls(char *path, t_flags *flgs)
-{
-	DIR				*dp;
-//	int 			blocks;
-//	char 			*tmp_path;
-	t_list			*dir_ent_list;
-
-//	tmp_path = 0;
-//	blocks = 0;
-	dir_ent_list = NULL;
-	if (!(dp = opendir(path)) || open(path, O_RDONLY) == -1)
-		put_error(path);
-	else
-	{
-		init_dir_ent_list(dp, &dir_ent_list, flgs);
-		output(dir_ent_list);
-	}
-
-}
-
-void	set_flags_to_zero(t_flags *flgs)
-{
-	flgs->a = 0;
-	flgs->l = 0;
-	flgs->R = 0;
-	flgs->t = 0;
-	flgs->col = 0;
-}
-
-void	parse_input(int ac, char **av, t_flags *flgs)
-{
-	int 	i;
-	int 	paths;
-
-	i = 0;
-	set_flags_to_zero(flgs);
-	if (ac == 1)
-		ft_ls(".", flgs);
-	else if (ac > 1)
-	{
-		while (i < ac - 1 && *av[i + 1] == '-')
-			if (chck_flgs(av[i + 1], flgs))
-				break ;
-			else
-				i++;
-		paths = i;
-		if (paths == ac - 1)
-			ft_ls("./", flgs);
-		else
-			while (paths < ac - 1)
-				ft_ls(av[paths++ + 1], flgs);
-	}
-}
-
 int		main(int argc, char **argv)
 {
 //	DIR				*dp;
diff --git a/src/output.c b/src/output.c
new file mode 100644
index 0000000..0d0abad
--- /dev/null
+++ b/src/output.c
@@ -0,0 +1,18 @@
+#include "ft_ls.h"
+
+void	column_out(t_list *entity)
+{
+	t_dir_entity *d_ent;
+
+	d_ent = (t_dir_entity *)entity->content;
+	if (d_ent->flags->a)
+		printf("%s\t", d_ent->dirent->d_name);
+	else
+	if (*d_ent->dirent->d_name != '.')
+		printf("%s\t\n", d_ent->dirent->d_name);
+}
+
+void	output(t_list *del)
+{
+	ft_lstiter(del, column_out);
+}
\ No newline at end of file
diff --git a/src/parse_input.c b/src/parse_input.c
new file mode 100644
index 0000000..ef60463
--- /dev/null
+++ b/src/parse_input.c
@@ -0,0 +1,26 @@
+#include "ft_ls.h"
+
+void	parse_input(int ac, char **av, t_flags *flgs)
+{
+	int 	i;
+	int 	paths;
+
+	i = 0;
+	set_flags_to_zero(flgs);
+	if (ac == 1)
+		ft_ls(".", flgs);
+	else if (ac > 1)
+	{
+		while (i < ac - 1 && *av[i + 1] == '-')
+			if (chck_flgs(av[i + 1], flgs))
+				break ;
+			else
+				i++;
+		paths = i;
+		if (paths == ac - 1)
+			ft_ls("./", flgs);
+		else
+			while (paths < ac - 1)
+				ft_ls(av[paths++ + 1], flgs);
+	}
+}
\ No newline at end of file
diff --git a/src/sort.c b/src/sort.c
new file mode 100644
index 0000000..5e9e422
--- /dev/null
+++ b/src/sort.c
@@ -0,0 +1,14 @@
+#include "ft_ls.h"
+
+
+
+void	sort_by(t_list **del, int (*f)())
+{
+
+}
+
+void	sort(t_list *del, t_flags *flgs)
+{
+	if (!flgs->t)
+		sort_by(&del, lex);
+}
\ No newline at end of file