shithub: view

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allow running view without loading any image

	make the image command line argument optional

--- a/view.c

+++ b/view.c

@@ -107,7 +107,8 @@

 {

 	lockdisplay(display);

 	draw(screen, screen->r, bg, nil, ZP);

-	draw(screen, rectaddpt(img->r, addpt(pos, screen->r.min)), img, nil, img->r.min);

+	if(img != nil)

+		draw(screen, rectaddpt(img->r, addpt(pos, screen->r.min)), img, nil, img->r.min);

 	flushimage(display, 1);

 	unlockdisplay(display);

 }

@@ -117,6 +118,8 @@

 {

 	Rectangle r, ir;

+	if(img == nil)

+		return;

 	if(Δ.x == 0 && Δ.y == 0)

 		return;

 	r = rectaddpt(img->r, addpt(pos, screen->r.min));

@@ -243,7 +246,12 @@

 		{ nil, nil, CHANEND },

 	}; 

-	ARGBEGIN{}ARGEND;

+	img = nil;

+	ARGBEGIN{

+	default:

+		usage();

+		break;

+	}ARGEND;

 	if(argc > 1)

 		usage();

 	if(initdraw(nil, nil, argv0) < 0)

@@ -262,8 +270,10 @@

 	alts[Eplumb].c = plumbc;

 	initbg();

 	proccreate(plumbproc, plumbc, 8192);

-	img = load(*argv);

-	pos = subpt(ZP, img->r.min);

+	if(*argv != nil){

+		img = load(*argv);

+		pos = subpt(ZP, img->r.min);

+	}

 	evtresize(0);

 	for(;;){

 		switch(alt(alts)){