Support interactive test of recurrence rule extensions

The generic command 'next' is introduced.

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

src/calcurse.c

@@ -557,7 +557,7 @@ static inline void key_generic_cmd(void)
 	int valid = 0, force = 0, ret;
 	char *error_msg;
 
-	status_mesg(_("Command: [ h(elp) | w(rite)(!) | q(uit)(!) | wq(!) ]"), "");
+	status_mesg(_("Command: [ h(elp) | w(rite)(!) | q(uit)(!) | wq(!) | n(ext) ]"), "");
 	if (getstring(win[STA].p, cmd, BUFSIZ, 0, 1) != GETSTRING_VALID)
 		goto cleanup;
 	cmd_name = strtok(cmd, " ");
@@ -609,6 +609,47 @@ static inline void key_generic_cmd(void)
 		valid = 1;
 	}
 
+	if (!strcmp(cmd_name, "next") || !strcmp(cmd_name, "n")) {
+		struct day_item *item;
+		time_t day, next;
+		struct recur_apoint *rapt;
+		struct recur_event *rev;
+		int more = 0;
+
+		if (wins_slctd() != APP) {
+			error_msg =
+				_("Select a repeating item in the appointments panel.");
+			warnbox(error_msg);
+			goto cleanup;
+		}
+		day = date2sec(*ui_calendar_get_slctd_day(), 0, 0);
+		item = ui_day_get_sel();
+		if (item->type == RECUR_EVNT) {
+			rev = item->item.rev;
+			more = recur_next_occurrence(rev->day, -1, rev->rpt, &rev->exc,
+						     day, &next);
+		} else if (item->type == RECUR_APPT) {
+			rapt = item->item.rapt;
+			more = recur_next_occurrence(rapt->start, rapt->dur, rapt->rpt,
+						     &rapt->exc, day, &next);
+		} else {
+			error_msg = _("Not a repeating item.");
+			warnbox(error_msg);
+			goto cleanup;
+		}
+		if (!more) {
+			error_msg = _("Last repetition.");
+			warnbox(error_msg);
+			goto cleanup;
+		}
+		item->start = next;
+		ui_calendar_set_slctd_day(sec2date(next));
+		day_set_sel_data(item);
+		do_storage(1);
+
+		valid = 1;
+	}
+
 	if (!valid) {
 		asprintf(&error_msg, _("No such command: %s"), cmd);
 		status_mesg(error_msg, "");

src/calcurse.h

@@ -1105,6 +1105,8 @@ void recur_apoint_check_next(struct notify_app *, time_t, time_t);
 void recur_apoint_switch_notify(struct recur_apoint *);
 void recur_event_paste_item(struct recur_event *, time_t);
 void recur_apoint_paste_item(struct recur_apoint *, time_t);
+int recur_next_occurrence(time_t, long, struct rpt *, llist_t *, time_t, time_t *);
+
 
 /* sigs.c */
 void sigs_init(void);

src/recur.c

@@ -1772,3 +1772,27 @@ void recur_apoint_paste_item(struct recur_apoint *rapt, time_t date)
 	if (notify_bar())
 		notify_check_repeated(rapt);
 }
+
+/*
+ * Finds the next occurrence of a recurrent item and returns it in the provided
+ * buffer. Useful for test of a repeated item.
+ */
+int recur_next_occurrence(time_t s, long d, struct rpt *r, llist_t *e,
+			  time_t occur, time_t *next)
+{
+	int ret = 0;
+
+	if (r->until && r->until <= occur)
+		return ret;
+
+	while (!r->until || occur < r->until) {
+		occur = NEXTDAY(occur);
+		if (!check_sec(&occur))
+			break;
+		if (recur_item_find_occurrence(s, d, r, e, occur, next)) {
+			ret = 1;
+			break;
+		}
+	}
+	return ret;
+}