lkt update

Update lkt to add the following commands:

Queue search

• lkt queue pos <pos> get the song with the position <pos> in the queue
• lkt queue pos <from:to> same but with a range
• lkt queue <count> get the next <count> songs in the queue
• lkt search queue <query> search in the queue for all songs matching the <query>

Queue manipulation

• lkt queue pop [pos] delete and go to next kara in the queue, the [pos] is optional
• lkt queue seek <id> go to the song the id <id>
• lkt queue delete <id> the song that has the id <id> in the queue
• lkt queue clear clear the queue
• lkt queue crop crop the queue

Solved issue(s)

Closes #30 (closed)

inc/lektor/cmd.h

@@ -4,7 +4,8 @@
 #include <stdnoreturn.h>
 #include <stddef.h>
 
-#define LKT_OPT_NULL { .name = NULL, .call = NULL, .name_len = 0 }
+#define LKT_OPT_NULL            { .name = NULL, .call = NULL }
+#define LKT_OPT_DEFAULT(func)   { .name = NULL, .call = func }
 
 struct lkt_cmd_args {
     int argc;               /* The number of arguments passed.  */
@@ -15,7 +16,6 @@ typedef void (*lkt_cmd_callback)(struct lkt_cmd_args *);
 
 struct lkt_cmd_opt {
     const char *name;
-    size_t name_len;
     lkt_cmd_callback call;
 };