do* has no Arg arument anymore (never called directly)

client.c

@@ -246,7 +246,7 @@ manage(Window w, XWindowAttributes *wa) {
 	XMapWindow(dpy, c->twin);
 	if(isvisible(c))
 		focus(c);
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -393,5 +393,5 @@ unmanage(Client *c) {
 	XSync(dpy, False);
 	XSetErrorHandler(xerror);
 	XUngrabServer(dpy);
-	arrange(NULL);
+	arrange();
 }

dwm.h

@@ -99,7 +99,7 @@ extern int bx, by, bw, bh, bmw;			/* bar geometry, bar mode label width */
 extern int screen, sx, sy, sw, sh;		/* screen geometry */
 extern unsigned int master, ntags, numlockmask;	/* master percent, number of tags, dynamic lock mask */
 extern void (*handler[LASTEvent])(XEvent *);	/* event handler */
-extern void (*arrange)(Arg *);			/* arrange function, indicates mode  */
+extern void (*arrange)(void);			/* arrange function, indicates mode  */
 extern Atom wmatom[WMLast], netatom[NetLast];
 extern Bool running, issel, *seltag;		/* seltag is array of Bool */
 extern Client *clients, *sel, *stack;		/* global client list and stack */
@@ -157,8 +157,8 @@ extern void spawn(Arg *arg);			/* forks a new subprocess with to arg's cmd */
 
 /* view.c */
 extern void detach(Client *c);			/* detaches c from global client list */
-extern void dofloat(Arg *arg);			/* arranges all windows floating, arg is ignored */
-extern void dotile(Arg *arg);			/* arranges all windows, arg is ignored */
+extern void dofloat(void);			/* arranges all windows floating */
+extern void dotile(void);			/* arranges all windows tiled */
 extern void focusnext(Arg *arg);		/* focuses next visible client, arg is ignored  */
 extern void focusprev(Arg *arg);		/* focuses previous visible client, arg is ignored */
 extern Bool isvisible(Client *c);		/* returns True if client is visible */

event.c

@@ -179,7 +179,7 @@ configurerequest(XEvent *e) {
 				ban(c);
 		}
 		else
-			arrange(NULL);
+			arrange();
 	}
 	else {
 		wc.x = ev->x;
@@ -304,7 +304,7 @@ propertynotify(XEvent *e) {
 			case XA_WM_TRANSIENT_FOR:
 				XGetTransientForHint(dpy, c->win, &trans);
 				if(!c->isfloat && (c->isfloat = (trans != 0)))
-					arrange(NULL);
+					arrange();
 				break;
 			case XA_WM_NORMAL_HINTS:
 				updatesize(c);

tag.c

@@ -117,7 +117,7 @@ tag(Arg *arg) {
 		sel->tags[i] = False;
 	sel->tags[arg->i] = True;
 	sel->weight = arg->i;
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -131,5 +131,5 @@ toggletag(Arg *arg) {
 	if(i == ntags)
 		sel->tags[arg->i] = True;
 	sel->weight = (i == ntags) ? arg->i : i;
-	arrange(NULL);
+	arrange();
 }

view.c

@@ -63,7 +63,7 @@ togglemax(Client *c) {
 
 /* extern */
 
-void (*arrange)(Arg *) = DEFMODE;
+void (*arrange)(void) = DEFMODE;
 
 void
 detach(Client *c) {
@@ -77,7 +77,7 @@ detach(Client *c) {
 }
 
 void
-dofloat(Arg *arg) {
+dofloat(void) {
 	Client *c;
 
 	for(c = clients; c; c = c->next) {
@@ -95,7 +95,7 @@ dofloat(Arg *arg) {
 }
 
 void
-dotile(Arg *arg) {
+dotile(void) {
 	unsigned int i, n, mpx, stackw, stackh, th;
 	Client *c;
 
@@ -210,7 +210,7 @@ resizecol(Arg *arg) {
 			return;
 		master -= arg->i;
 	}
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -247,7 +247,7 @@ void
 togglemode(Arg *arg) {
 	arrange = (arrange == dofloat) ? dotile : dofloat;
 	if(sel)
-		arrange(NULL);
+		arrange();
 	else
 		drawstatus();
 }
@@ -261,7 +261,7 @@ toggleview(Arg *arg) {
 	if(i == ntags)
 		seltag[arg->i] = True; /* cannot toggle last view */
 	reorder();
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -272,7 +272,7 @@ view(Arg *arg) {
 		seltag[i] = False;
 	seltag[arg->i] = True;
 	reorder();
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -282,7 +282,7 @@ viewall(Arg *arg) {
 	for(i = 0; i < ntags; i++)
 		seltag[i] = True;
 	reorder();
-	arrange(NULL);
+	arrange();
 }
 
 void
@@ -310,5 +310,5 @@ zoom(Arg *arg) {
 	c->next = clients;
 	clients = c;
 	focus(c);
-	arrange(NULL);
+	arrange();
 }