desktop-shell: make panel clock configurable

This patch enhances the panel clock by adding a config file
option which can be used to either disable the clock or make
it also show seconds in the current clock format.

v2: Implement suggestions from Pekka:
    - Include Signed-off-by
    - Coding style fixes
    - Implement clock widget allocation by using
      width from cairo_text_extents
    - Highlight config option values in man page
v3: Implement suggestions from Pekka and Bryce:
    - Use CLOCK_FORMAT_* instead of FORMAT_* in the enum
    - Switch to using fixed clock widget size instead
      of one returned from cairo_text_extents
    - Fixes to config option highlighting in the man page
v4: Implement more suggestions from Pekka and Bryce:
    - Improve patch changelog
    - Move the check for CLOCK_FORMAT_NONE into the
      caller function
    - Fix a memory leak in panel_create introduced by
      previous revision of this patch

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57583
Signed-off-by: Armin Krezović <armin.krezovic@fet.ba>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

clients/desktop-shell.c

@@ -50,6 +50,8 @@
 
 #include "weston-desktop-shell-client-protocol.h"
 
+#define DEFAULT_CLOCK_FORMAT CLOCK_FORMAT_MINUTES
+
 extern char **environ; /* defined by libc */
 
 struct desktop {
@@ -84,6 +86,7 @@ struct panel {
 	struct wl_list launcher_list;
 	struct panel_clock *clock;
 	int painted;
+	int clock_format;
 	uint32_t color;
 };
 
@@ -123,6 +126,8 @@ struct panel_clock {
 	struct panel *panel;
 	struct task clock_task;
 	int clock_fd;
+	char *format_string;
+	time_t refresh_timer;
 };
 
 struct unlock_dialog {
@@ -357,7 +362,7 @@ panel_clock_redraw_handler(struct widget *widget, void *data)
 
 	time(&rawtime);
 	timeinfo = localtime(&rawtime);
-	strftime(string, sizeof string, "%a %b %d, %I:%M %p", timeinfo);
+	strftime(string, sizeof string, clock->format_string, timeinfo);
 
 	widget_get_allocation(widget, &allocation);
 	if (allocation.width == 0)
@@ -386,9 +391,9 @@ clock_timer_reset(struct panel_clock *clock)
 {
 	struct itimerspec its;
 
-	its.it_interval.tv_sec = 60;
+	its.it_interval.tv_sec = clock->refresh_timer;
 	its.it_interval.tv_nsec = 0;
-	its.it_value.tv_sec = 60;
+	its.it_value.tv_sec = clock->refresh_timer;
 	its.it_value.tv_nsec = 0;
 	if (timerfd_settime(clock->clock_fd, 0, &its, NULL) < 0) {
 		fprintf(stderr, "could not set timerfd\n: %m");
@@ -408,6 +413,12 @@ panel_destroy_clock(struct panel_clock *clock)
 	free(clock);
 }
 
+enum {
+	CLOCK_FORMAT_MINUTES,
+	CLOCK_FORMAT_SECONDS,
+	CLOCK_FORMAT_NONE
+};
+
 static void
 panel_add_clock(struct panel *panel)
 {
@@ -425,6 +436,17 @@ panel_add_clock(struct panel *panel)
 	panel->clock = clock;
 	clock->clock_fd = timerfd;
 
+	switch (panel->clock_format) {
+	case CLOCK_FORMAT_MINUTES:
+		clock->format_string = "%a %b %d, %I:%M %p";
+		clock->refresh_timer = 60;
+		break;
+	case CLOCK_FORMAT_SECONDS:
+		clock->format_string = "%a %b %d, %I:%M:%S %p";
+		clock->refresh_timer = 1;
+		break;
+	}
+
 	clock->clock_task.run = clock_func;
 	display_watch_fd(window_get_display(panel->window), clock->clock_fd,
 			 EPOLLIN, &clock->clock_task);
@@ -451,8 +473,13 @@ panel_resize_handler(struct widget *widget,
 				      x, y - h / 2, w + 1, h + 1);
 		x += w + 10;
 	}
-	h=20;
+
-	w=170;
+	h = 20;
+
+	if (panel->clock_format == CLOCK_FORMAT_SECONDS)
+		w = 190;
+	else /* CLOCK_FORMAT_MINUTES */
+		w = 170;
 
 	if (panel->clock)
 		widget_set_allocation(panel->clock->widget,
@@ -493,6 +520,7 @@ panel_destroy(struct panel *panel)
 	struct panel_launcher *tmp;
 	struct panel_launcher *launcher;
 
+	if (panel->clock)
 		panel_destroy_clock(panel->clock);
 
 	wl_list_for_each_safe(launcher, tmp, &panel->launcher_list, link)
@@ -509,6 +537,7 @@ panel_create(struct desktop *desktop)
 {
 	struct panel *panel;
 	struct weston_config_section *s;
+	char *clock_format_option = NULL;
 
 	panel = xzalloc(sizeof *panel);
 
@@ -523,8 +552,23 @@ panel_create(struct desktop *desktop)
 	widget_set_redraw_handler(panel->widget, panel_redraw_handler);
 	widget_set_resize_handler(panel->widget, panel_resize_handler);
 
+	s = weston_config_get_section(desktop->config, "shell", NULL, NULL);
+	weston_config_section_get_string(s, "clock-format", &clock_format_option, "");
+
+	if (strcmp(clock_format_option, "minutes") == 0)
+		panel->clock_format = CLOCK_FORMAT_MINUTES;
+	else if (strcmp(clock_format_option, "seconds") == 0)
+		panel->clock_format = CLOCK_FORMAT_SECONDS;
+	else if (strcmp(clock_format_option, "none") == 0)
+		panel->clock_format = CLOCK_FORMAT_NONE;
+	else
+		panel->clock_format = DEFAULT_CLOCK_FORMAT;
+
+	if (panel->clock_format != CLOCK_FORMAT_NONE)
 		panel_add_clock(panel);
 
+	free (clock_format_option);
+
 	s = weston_config_get_section(desktop->config, "shell", NULL, NULL);
 	weston_config_section_get_uint(s, "panel-color",
 				       &panel->color, 0xaa000000);

man/weston.ini.man

@@ -212,6 +212,13 @@ output. Tile repeats the background image to fill the output.
 sets the color of the background (unsigned integer). The hexadecimal
 digit pairs are in order alpha, red, green, and blue.
 .TP 7
+.BI "clock-format=" format
+sets the panel clock format (string). Can be
+.BR "none" ","
+.BR "minutes" ","
+.BR "seconds" "."
+By default, minutes format is used.
+.TP 7
 .BI "panel-color=" 0xAARRGGBB
 sets the color of the panel (unsigned integer). The hexadecimal
 digit pairs are in order transparency, red, green, and blue. Examples:

weston.ini.in

@@ -7,6 +7,7 @@
 background-image=/usr/share/backgrounds/gnome/Aqua.jpg
 background-color=0xff002244
 background-type=tile
+clock-format=minutes
 panel-color=0x90ff0000
 locking=true
 animation=zoom