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winwatch: honor $font instead of hardcoding

--- a/sys/src/cmd/winwatch.c

+++ b/sys/src/cmd/winwatch.c

@@ -20,7 +20,6 @@

 int mwin;

 int onwin;

 int rows, cols;

-Font *font;

 Image *lightblue;

 enum {

@@ -243,11 +242,10 @@

 void

 main(int argc, char **argv)

 {

-	char *fontname;

+	char *fontname = nil;

 	int Etimer;

 	Event e;

-	fontname = "/lib/font/bit/lucidasans/unicode.8.font";

 	ARGBEGIN{

 	case 'f':

 		fontname = EARGF(usage());

@@ -268,8 +266,10 @@

 	lightblue = allocimagemix(display, DPalebluegreen, DWhite);

 	if(lightblue == nil)

 		sysfatal("allocimagemix: %r");

-	if((font = openfont(display, fontname)) == nil)

-		sysfatal("font '%s' not found", fontname);

+

+	if(fontname)

+		if((font = openfont(display, fontname)) == nil)

+			sysfatal("font '%s' not found", fontname);

 	refreshwin();

 	redraw(screen, 1);