Add prefix feature

include/data.h

@@ -31,8 +31,14 @@ struct const_t {
   int QUIT_TIMES;
 };
 
+struct prefix_t {
+  char prefix_name[64];
+  int prefix_id;
+};
+
 struct keyBind_t {
   char *key_sequence;
+  int prefix_id;
   Lisp command;
   
 };
@@ -53,6 +59,7 @@ struct editorConfig {
   int dirty;
   char *filename;
   enum editorStatus_e state;
+  int prefix_state;
   char status_msg[80];
   time_t status_msg_time;
   struct termios orig_termios; /**< Terminal communication interface */
@@ -68,6 +75,9 @@ struct editorConfig {
 
   struct keyBind_t* key_binds;
   int number_of_keybinds;
+  
+  struct prefix_t* prefix;
+  int number_of_prefix;
 
 };