First day of week can now be any day

Previously only Sunday and Monday were allowed as the first day of the
week, and this was internally treated as a binary variable.

This patch allows for users to change the first day of the week to any
day.

Addresses GitHub feature request #321.

Signed-off-by: Morgan Seltzer <MorganSeltzer000@gmail.com>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

src/config.c

@@ -36,6 +36,8 @@
 
 #include <ctype.h>
 #include <unistd.h>
+#include <string.h>
+#include <strings.h>
 
 #include "calcurse.h"
 
@@ -261,15 +263,17 @@ static int config_parse_default_panel(void *dummy, const char *val)
 
 static int config_parse_first_day_of_week(void *dummy, const char *val)
 {
-	if (!strcmp(val, "monday"))
+	int i;
-		ui_calendar_set_first_day_of_week(MONDAY);
-	else if (!strcmp(val, "sunday"))
-		ui_calendar_set_first_day_of_week(SUNDAY);
-	else
-		return 0;
 
+	for (i = 0; i < WEEKINDAYS; i++) {
+		if(!strcasecmp(val, get_wday_default_string(i))) {
+			ui_calendar_set_first_day_of_week(i);
 			return 1;
 		}
+	}
+
+	return 0;
+}
 
 static int config_parse_color_theme(void *dummy, const char *val)
 {

src/custom.c

@@ -38,6 +38,7 @@
 #include <stdlib.h>
 #include <math.h>
 #include <ctype.h>
+#include <langinfo.h>
 
 #include "calcurse.h"
 
@@ -702,8 +703,7 @@ static void print_general_option(int i, WINDOW *win, int y, int hilt, void *cb_d
 	case FIRST_DAY_OF_WEEK:
 		custom_apply_attr(win, ATTR_HIGHEST);
 		mvwaddstr(win, y, XPOS + strlen(opt[FIRST_DAY_OF_WEEK]),
-			  ui_calendar_get_wday_start()? _("Monday") :
+			  nl_langinfo(DAY_1 + ui_calendar_get_wday_start()));
-			  _("Sunday"));
 		custom_remove_attr(win, ATTR_HIGHEST);
 		mvwaddstr(win, y + 1, XPOS,
 			  _("(specifies the first day of week in the calendar view)"));

src/ui-calendar.c

@@ -159,7 +159,9 @@ void ui_calendar_set_first_day_of_week(enum wday first_day)
 /* Swap first day of week in calendar. */
 void ui_calendar_change_first_day_of_week(void)
 {
-	wday_start = !wday_start;
+	wday_start++;
+	if(wday_start >= WEEKINDAYS)
+		wday_start = 0;
 }
 
 /* Return 1 if week begins on monday, 0 otherwise. */