Make day_store_items() public

Remove the "static" keyword from day_store_items(), so that it is
accessible from other compilation units. Also, allow for discarding the
event/appointment counters by passing NULL pointers and move the
"regex.h" header inclusion to "calcurse.h".

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/args.c

@@ -41,7 +41,6 @@
 #include <limits.h>
 #include <getopt.h>
 #include <time.h>
-#include <regex.h>
 
 #include "calcurse.h"
 

src/calcurse.h

@@ -53,6 +53,7 @@
 #include <time.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <regex.h>
 
 #include "llist.h"
 #include "htable.h"
@@ -663,6 +664,7 @@ void custom_config_main(void);
 
 /* day.c */
 void day_free_list(void);
+int day_store_items(long, unsigned *, unsigned *, regex_t *);
 struct day_items_nb *day_process_storage(struct date *, unsigned,
                                          struct day_items_nb *);
 void day_write_pad(long, int, int, int);

src/day.c

@@ -39,7 +39,6 @@
 #include <sys/types.h>
 #include <ctype.h>
 #include <time.h>
-#include <regex.h>
 
 #include "calcurse.h"
 
@@ -280,7 +279,7 @@ static int day_store_recur_apoints(long date, regex_t *regex)
  * and the length of the new pad to write is returned.
  * The number of events and appointments in the current day are also updated.
  */
-static int
+int
 day_store_items(long date, unsigned *pnb_events, unsigned *pnb_apoints,
                 regex_t *regex)
 {
@@ -292,13 +291,17 @@ day_store_items(long date, unsigned *pnb_events, unsigned *pnb_apoints,
   day_init_list();
   nb_recur_events = day_store_recur_events(date, regex);
   nb_events = day_store_events(date, regex);
+  if (pnb_events)
     *pnb_events = nb_events;
   nb_recur_apoints = day_store_recur_apoints(date, regex);
   nb_apoints = day_store_apoints(date, regex);
+  if (pnb_apoints)
     *pnb_apoints = nb_apoints;
   pad_length = (nb_recur_events + nb_events + 1 +
                 3 * (nb_recur_apoints + nb_apoints));
+  if (pnb_apoints)
     *pnb_apoints += nb_recur_apoints;
+  if (pnb_events)
     *pnb_events += nb_recur_events;
 
   return pad_length;