--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwm.c	Thu May 29 23:12:30 2008 +0200
@@ -0,0 +1,1846 @@
+/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
+ * See LICENSE file for license details.
+ *
+ * dynamic window manager is designed like any other X client as well. It is
+ * driven through handling X events. In contrast to other X clients, a window
+ * manager selects for SubstructureRedirectMask on the root window, to receive
+ * events about window (dis-)appearance.  Only one X connection at a time is
+ * allowed to select for this event mask.
+ *
+ * Calls to fetch an X event from the event queue are blocking.  Due reading
+ * status text from standard input, a select()-driven main loop has been
+ * implemented which selects for reads on the X connection and STDIN_FILENO to
+ * handle all data smoothly. The event handlers of dwm are organized in an
+ * array which is accessed whenever a new event has been fetched. This allows
+ * event dispatching in O(1) time.
+ *
+ * Each child of the root window is called a client, except windows which have
+ * set the override_redirect flag.  Clients are organized in a global
+ * doubly-linked client list, the focus history is remembered through a global
+ * stack list. Each client contains an array of Bools of the same size as the
+ * global tags array to indicate the tags of a client.  For each client dwm
+ * creates a small title window, which is resized whenever the (_NET_)WM_NAME
+ * properties are updated or the client is moved/resized.
+ *
+ * Keys and tagging rules are organized as arrays and defined in the config.h
+ * file. These arrays are kept static in event.o and tag.o respectively,
+ * because no other part of dwm needs access to them.  The current mode is
+ * represented by the arrange() function pointer, which wether points to
+ * dofloat() or dotile().
+ *
+ * To understand everything else, start reading main.c:main().
+ */
+
+#include "config.h"
+#include <errno.h>
+#include <locale.h>
+#include <regex.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <X11/cursorfont.h>
+#include <X11/keysym.h>
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/Xproto.h>
+#include <X11/Xutil.h>
+
+/* mask shorthands, used in event.c and client.c */
+#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
+
+enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
+enum { WMProtocols, WMDelete, WMState, WMLast };	/* default atoms */
+enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
+enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
+
+typedef union {
+	const char *cmd;
+	int i;
+} Arg; /* argument type */
+
+typedef struct {
+	int ascent;
+	int descent;
+	int height;
+	XFontSet set;
+	XFontStruct *xfont;
+} Fnt;
+
+typedef struct {
+	int x, y, w, h;
+	unsigned long norm[ColLast];
+	unsigned long sel[ColLast];
+	Drawable drawable;
+	Fnt font;
+	GC gc;
+} DC; /* draw context */
+
+typedef struct Client Client;
+struct Client {
+	char name[256];
+	int x, y, w, h;
+	int rx, ry, rw, rh; /* revert geometry */
+	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
+	int minax, minay, maxax, maxay;
+	long flags;
+	unsigned int border;
+	Bool isfixed, isfloat, ismax;
+	Bool *tags;
+	Client *next;
+	Client *prev;
+	Client *snext;
+	Window win;
+};
+
+typedef struct {
+	const char *clpattern;
+	const char *tpattern;
+	Bool isfloat;
+} Rule;
+
+typedef struct {
+	regex_t *clregex;
+	regex_t *tregex;
+} RReg;
+
+
+typedef struct {
+	unsigned long mod;
+	KeySym keysym;
+	void (*func)(Arg *arg);
+	Arg arg;
+} Key;
+
+
+#define CLEANMASK(mask) (mask & ~(numlockmask | LockMask))
+#define MOUSEMASK		(BUTTONMASK | PointerMotionMask)
+
+
+
+const char *tags[];			/* all tags */
+char stext[256];				/* status text */
+int bh, bmw;				/* bar height, bar mode label width */
+int screen, sx, sy, sw, sh;		/* screen geometry */
+int wax, way, wah, waw;			/* windowarea geometry */
+unsigned int nmaster;		/* number of master clients */
+unsigned int ntags, numlockmask;		/* number of tags, dynamic lock mask */
+void (*handler[LASTEvent])(XEvent *);	/* event handler */
+void (*arrange)(void);			/* arrange function, indicates mode  */
+Atom wmatom[WMLast], netatom[NetLast];
+Bool running, selscreen, *seltag;	/* seltag is array of Bool */
+Client *clients, *sel, *stack;		/* global client list and stack */
+Cursor cursor[CurLast];
+DC dc;					/* global draw context */
+Display *dpy;
+Window root, barwin;
+
+Bool running = True;
+Bool selscreen = True;
+Client *clients = NULL;
+Client *sel = NULL;
+Client *stack = NULL;
+DC dc = {0};
+
+static int (*xerrorxlib)(Display *, XErrorEvent *);
+static Bool otherwm, readin;
+static RReg *rreg = NULL;
+static unsigned int len = 0;
+
+
+TAGS
+RULES
+
+
+/* client.c */
+void configure(Client *c);		/* send synthetic configure event */
+void focus(Client *c);			/* focus c, c may be NULL */
+Client *getclient(Window w);		/* return client of w */
+Bool isprotodel(Client *c);		/* returns True if c->win supports wmatom[WMDelete] */
+void killclient(Arg *arg);		/* kill c nicely */
+void manage(Window w, XWindowAttributes *wa);	/* manage new client */
+void resize(Client *c, Bool sizehints);	/* resize c*/
+void updatesizehints(Client *c);		/* update the size hint variables of c */
+void updatetitle(Client *c);		/* update the name of c */
+void unmanage(Client *c);		/* destroy c */
+
+/* draw.c */
+void drawstatus(void);			/* draw the bar */
+unsigned long getcolor(const char *colstr);	/* return color of colstr */
+void setfont(const char *fontstr);	/* set the font for DC */
+unsigned int textw(const char *text);	/* return the width of text in px*/
+
+/* event.c */
+void grabkeys(void);			/* grab all keys defined in config.h */
+void procevent(void);			/* process pending X events */
+
+/* main.c */
+void quit(Arg *arg);			/* quit dwm nicely */
+void sendevent(Window w, Atom a, long value);	/* send synthetic event to w */
+int xerror(Display *dsply, XErrorEvent *ee);	/* dwm's X error handler */
+
+/* tag.c */
+void initrregs(void);			/* initialize regexps of rules defined in config.h */
+Client *getnext(Client *c);		/* returns next visible client */
+Client *getprev(Client *c);		/* returns previous visible client */
+void settags(Client *c, Client *trans);	/* sets tags of c */
+void tag(Arg *arg);			/* tags c with arg's index */
+void toggletag(Arg *arg);		/* toggles c tags with arg's index */
+void viewnext(Arg *arg);    /* view next tag(s) */
+
+/* util.c */
+void *emallocz(unsigned int size);	/* allocates zero-initialized memory, exits on error */
+void eprint(const char *errstr, ...);	/* prints errstr and exits with 1 */
+void spawn(Arg *arg);			/* forks a new subprocess with to arg's cmd */
+
+/* view.c */
+void detach(Client *c);			/* detaches c from global client list */
+void dofloat(void);			/* arranges all windows floating */
+void dotile(void);			/* arranges all windows tiled */
+void domax(void);            /* arranges all windows fullscreen */
+void focusnext(Arg *arg);		/* focuses next visible client, arg is ignored  */
+void incnmaster(Arg *arg);		/* increments nmaster with arg's index value */
+Bool isvisible(Client *c);		/* returns True if client is visible */
+void restack(void);			/* restores z layers of all clients */
+void togglefloat(Arg *arg);		/* toggles focusesd client between floating/non-floating state */
+void togglemode(Arg *arg);		/* toggles global arrange function (dotile/dofloat) */
+void view(Arg *arg);			/* views the tag with arg's index */
+void zoom(Arg *arg);			/* zooms the focused client to master area, arg is ignored */
+
+
+
+
+
+
+
+
+
+
+/* from view.c */
+/* static */
+
+static Client *
+nexttiled(Client *c) {
+	for(c = getnext(c); c && c->isfloat; c = getnext(c->next));
+	return c;
+}
+
+static void
+togglemax(Client *c) {
+	XEvent ev;
+		
+	if(c->isfixed)
+		return;
+
+	if((c->ismax = !c->ismax)) {
+		c->rx = c->x; c->x = wax;
+		c->ry = c->y; c->y = way;
+		c->rw = c->w; c->w = waw - 2 * BORDERPX;
+		c->rh = c->h; c->h = wah - 2 * BORDERPX;
+	}
+	else {
+		c->x = c->rx;
+		c->y = c->ry;
+		c->w = c->rw;
+		c->h = c->rh;
+	}
+	resize(c, True);
+	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+}
+
+
+
+void (*arrange)(void) = DEFMODE;
+
+void
+detach(Client *c) {
+	if(c->prev)
+		c->prev->next = c->next;
+	if(c->next)
+		c->next->prev = c->prev;
+	if(c == clients)
+		clients = c->next;
+	c->next = c->prev = NULL;
+}
+
+void
+dofloat(void) {
+	Client *c;
+
+	for(c = clients; c; c = c->next) {
+		if(isvisible(c)) {
+			resize(c, True);
+		}
+		else
+			XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+	}
+	if(!sel || !isvisible(sel)) {
+		for(c = stack; c && !isvisible(c); c = c->snext);
+		focus(c);
+	}
+	restack();
+}
+
+void
+dotile(void) {
+	unsigned int i, n, mw, mh, tw, th;
+	Client *c;
+
+	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
+		n++;
+	/* window geoms */
+	mh = (n > nmaster) ? wah / nmaster : wah / (n > 0 ? n : 1);
+	mw = (n > nmaster) ? waw / 2 : waw;
+	th = (n > nmaster) ? wah / (n - nmaster) : 0;
+	tw = waw - mw;
+
+	for(i = 0, c = clients; c; c = c->next)
+		if(isvisible(c)) {
+			if(c->isfloat) {
+				resize(c, True);
+				continue;
+			}
+			c->ismax = False;
+			c->x = wax;
+			c->y = way;
+			if(i < nmaster) {
+				c->y += i * mh;
+				c->w = mw - 2 * BORDERPX;
+				c->h = mh - 2 * BORDERPX;
+			}
+			else {  /* tile window */
+				c->x += mw;
+				c->w = tw - 2 * BORDERPX;
+				if(th > 2 * BORDERPX) {
+					c->y += (i - nmaster) * th;
+					c->h = th - 2 * BORDERPX;
+				}
+				else /* fallback if th <= 2 * BORDERPX */
+					c->h = wah - 2 * BORDERPX;
+			}
+			resize(c, False);
+			i++;
+		}
+		else
+			XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+	if(!sel || !isvisible(sel)) {
+		for(c = stack; c && !isvisible(c); c = c->snext);
+		focus(c);
+	}
+	restack();
+}
+
+/* begin code by mitch */
+void
+arrangemax(Client *c) {
+  if(c == sel) {
+    c->ismax = True;
+    c->x = sx;
+    c->y = bh;
+    c->w = sw - 2 * BORDERPX;
+    c->h = sh - bh - 2 * BORDERPX;
+    XRaiseWindow(dpy, c->win);
+  } else {
+    c->ismax = False;
+    XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+    XLowerWindow(dpy, c->win);
+  }
+}
+
+void
+domax(void) {
+  Client *c;
+
+  for(c = clients; c; c = c->next) {
+    if(isvisible(c)) {
+      if(c->isfloat) {
+        resize(c, True);
+        continue;
+      }
+      arrangemax(c);
+      resize(c, False);
+    } else {
+      XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+    }
+
+  }
+  if(!sel || !isvisible(sel)) {
+    for(c = stack; c && !isvisible(c); c = c->snext);
+    focus(c);
+  }
+  restack();
+}
+/* end code by mitch */
+
+void
+focusnext(Arg *arg) {
+	Client *c;
+
+	if(!sel)
+		return;
+	if(!(c = getnext(sel->next)))
+		c = getnext(clients);
+	if(c) {
+		focus(c);
+		restack();
+	}
+}
+
+void
+incnmaster(Arg *arg) {
+	if((arrange == dofloat) || (nmaster + arg->i < 1)
+		|| (wah / (nmaster + arg->i) <= 2 * BORDERPX))
+		return;
+	nmaster += arg->i;
+	if(sel)
+		arrange();
+	else
+		drawstatus();
+}
+
+Bool
+isvisible(Client *c) {
+	unsigned int i;
+
+	for(i = 0; i < ntags; i++)
+		if(c->tags[i] && seltag[i])
+			return True;
+	return False;
+}
+
+void
+restack(void) {
+	Client *c;
+	XEvent ev;
+
+	drawstatus();
+	if(!sel)
+		return;
+	if(sel->isfloat || arrange == dofloat)
+		XRaiseWindow(dpy, sel->win);
+
+  /* begin code by mitch */
+  if(arrange == domax) {
+    for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
+      arrangemax(c);
+      resize(c, False);
+    }
+
+  } else if (arrange == dotile) {
+  /* end code by mitch */
+
+		if(!sel->isfloat)
+			XLowerWindow(dpy, sel->win);
+		for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
+			if(c == sel)
+				continue;
+			XLowerWindow(dpy, c->win);
+		}
+	}
+	XSync(dpy, False);
+	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+}
+
+void
+togglefloat(Arg *arg) {
+	if (!sel || arrange == dofloat)
+		return;
+	sel->isfloat = !sel->isfloat;
+	arrange();
+}
+
+void
+togglemode(Arg *arg) {
+  /* only toggle between tile and max - float is just available through togglefloat */
+  arrange = (arrange == dotile) ? domax : dotile;
+	if(sel)
+		arrange();
+	else
+		drawstatus();
+}
+
+void
+view(Arg *arg) {
+	unsigned int i;
+
+	for(i = 0; i < ntags; i++)
+		seltag[i] = (arg->i == -1) ? True : False;
+	if(arg->i >= 0 && arg->i < ntags)
+		seltag[arg->i] = True;
+	arrange();
+}
+
+void
+zoom(Arg *arg) {
+	unsigned int n;
+	Client *c;
+
+	if(!sel)
+		return;
+	if(sel->isfloat || (arrange == dofloat)) {
+		togglemax(sel);
+		return;
+	}
+	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
+		n++;
+
+	if((c = sel) == nexttiled(clients))
+		if(!(c = nexttiled(c->next)))
+			return;
+	detach(c);
+	if(clients)
+		clients->prev = c;
+	c->next = clients;
+	clients = c;
+	focus(c);
+	arrange();
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* from util.c */
+
+
+void *
+emallocz(unsigned int size) {
+	void *res = calloc(1, size);
+
+	if(!res)
+		eprint("fatal: could not malloc() %u bytes\n", size);
+	return res;
+}
+
+void
+eprint(const char *errstr, ...) {
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+void
+spawn(Arg *arg) {
+	static char *shell = NULL;
+
+	if(!shell && !(shell = getenv("SHELL")))
+		shell = "/bin/sh";
+	if(!arg->cmd)
+		return;
+	/* The double-fork construct avoids zombie processes and keeps the code
+	 * clean from stupid signal handlers. */
+	if(fork() == 0) {
+		if(fork() == 0) {
+			if(dpy)
+				close(ConnectionNumber(dpy));
+			setsid();
+			execl(shell, shell, "-c", arg->cmd, (char *)NULL);
+			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
+			perror(" failed");
+		}
+		exit(0);
+	}
+	wait(0);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* from tag.c */
+
+/* static */
+
+Client *
+getnext(Client *c) {
+	for(; c && !isvisible(c); c = c->next);
+	return c;
+}
+
+Client *
+getprev(Client *c) {
+	for(; c && !isvisible(c); c = c->prev);
+	return c;
+}
+
+void
+initrregs(void) {
+	unsigned int i;
+	regex_t *reg;
+
+	if(rreg)
+		return;
+	len = sizeof rule / sizeof rule[0];
+	rreg = emallocz(len * sizeof(RReg));
+	for(i = 0; i < len; i++) {
+		if(rule[i].clpattern) {
+			reg = emallocz(sizeof(regex_t));
+			if(regcomp(reg, rule[i].clpattern, REG_EXTENDED))
+				free(reg);
+			else
+				rreg[i].clregex = reg;
+		}
+		if(rule[i].tpattern) {
+			reg = emallocz(sizeof(regex_t));
+			if(regcomp(reg, rule[i].tpattern, REG_EXTENDED))
+				free(reg);
+			else
+				rreg[i].tregex = reg;
+		}
+	}
+}
+
+void
+settags(Client *c, Client *trans) {
+	char prop[512];
+	unsigned int i, j;
+	regmatch_t tmp;
+	Bool matched = trans != NULL;
+	XClassHint ch = { 0 };
+
+	if(matched) {
+		for(i = 0; i < ntags; i++)
+			c->tags[i] = trans->tags[i];
+	}
+	else {
+		XGetClassHint(dpy, c->win, &ch);
+		snprintf(prop, sizeof prop, "%s:%s:%s",
+				ch.res_class ? ch.res_class : "",
+				ch.res_name ? ch.res_name : "", c->name);
+		for(i = 0; i < len; i++)
+			if(rreg[i].clregex && !regexec(rreg[i].clregex, prop, 1, &tmp, 0)) {
+				c->isfloat = rule[i].isfloat;
+				for(j = 0; rreg[i].tregex && j < ntags; j++) {
+					if(!regexec(rreg[i].tregex, tags[j], 1, &tmp, 0)) {
+						matched = True;
+						c->tags[j] = True;
+					}
+				}
+        break;  /* perform only the first rule matching */
+			}
+		if(ch.res_class)
+			XFree(ch.res_class);
+		if(ch.res_name)
+			XFree(ch.res_name);
+	}
+	if(!matched)
+		for(i = 0; i < ntags; i++)
+			c->tags[i] = seltag[i];
+}
+
+void
+tag(Arg *arg) {
+	unsigned int i;
+
+	if(!sel)
+		return;
+	for(i = 0; i < ntags; i++)
+		sel->tags[i] = (arg->i == -1) ? True : False;
+	if(arg->i >= 0 && arg->i < ntags)
+		sel->tags[arg->i] = True;
+	arrange();
+}
+
+void
+toggletag(Arg *arg) {
+	unsigned int i;
+
+	if(!sel)
+		return;
+	sel->tags[arg->i] = !sel->tags[arg->i];
+	for(i = 0; i < ntags && !sel->tags[i]; i++);
+	if(i == ntags)
+		sel->tags[arg->i] = True;
+	arrange();
+}
+
+/* begin code by jukka */
+void
+viewnext(Arg *arg) {
+  unsigned int i;
+  Bool last = seltag[ntags-1];
+
+  for (i=ntags-1; i>0; --i)
+    seltag[i] = seltag[i-1];
+  seltag[0] = last;
+  arrange();
+}
+/* end code by jukka */
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* from event.c */
+/* static */
+
+KEYS
+
+
+
+static void
+movemouse(Client *c) {
+	int x1, y1, ocx, ocy, di;
+	unsigned int dui;
+	Window dummy;
+	XEvent ev;
+
+	ocx = c->x;
+	ocy = c->y;
+	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
+			None, cursor[CurMove], CurrentTime) != GrabSuccess)
+		return;
+	c->ismax = False;
+	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
+	for(;;) {
+		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
+		switch (ev.type) {
+		case ButtonRelease:
+			resize(c, True);
+			XUngrabPointer(dpy, CurrentTime);
+			return;
+		case ConfigureRequest:
+		case Expose:
+		case MapRequest:
+			handler[ev.type](&ev);
+			break;
+		case MotionNotify:
+			XSync(dpy, False);
+			c->x = ocx + (ev.xmotion.x - x1);
+			c->y = ocy + (ev.xmotion.y - y1);
+			if(abs(wax + c->x) < SNAP)
+				c->x = wax;
+			else if(abs((wax + waw) - (c->x + c->w + 2 * c->border)) < SNAP)
+				c->x = wax + waw - c->w - 2 * c->border;
+			if(abs(way - c->y) < SNAP)
+				c->y = way;
+			else if(abs((way + wah) - (c->y + c->h + 2 * c->border)) < SNAP)
+				c->y = way + wah - c->h - 2 * c->border;
+			resize(c, False);
+			break;
+		}
+	}
+}
+
+static void
+resizemouse(Client *c) {
+	int ocx, ocy;
+	int nw, nh;
+	XEvent ev;
+
+	ocx = c->x;
+	ocy = c->y;
+	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
+			None, cursor[CurResize], CurrentTime) != GrabSuccess)
+		return;
+	c->ismax = False;
+	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
+	for(;;) {
+		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
+		switch(ev.type) {
+		case ButtonRelease:
+			resize(c, True);
+			XUngrabPointer(dpy, CurrentTime);
+			return;
+		case ConfigureRequest:
+		case Expose:
+		case MapRequest:
+			handler[ev.type](&ev);
+			break;
+		case MotionNotify:
+			XSync(dpy, False);
+			nw = ev.xmotion.x - ocx - 2 * c->border + 1;
+			c->w = nw > 0 ? nw : 1;
+			nh = ev.xmotion.y - ocy - 2 * c->border + 1;
+			c->h = nh > 0 ? nh : 1;
+			resize(c, True);
+			break;
+		}
+	}
+}
+
+static void
+buttonpress(XEvent *e) {
+	int x;
+	Arg a;
+	Client *c;
+	XButtonPressedEvent *ev = &e->xbutton;
+
+	if(barwin == ev->window) {
+		x = 0;
+		for(a.i = 0; a.i < ntags; a.i++) {
+			x += textw(tags[a.i]);
+			if(ev->x < x) {
+				if(ev->button == Button1) {
+					view(&a);
+				}
+				return;
+			}
+		}
+		if(ev->x < x + bmw)
+			if (ev->button == Button1) {
+				togglemode(NULL);
+			}
+	}
+	else if((c = getclient(ev->window))) {
+		focus(c);
+		if(CLEANMASK(ev->state) != MODKEY)
+			return;
+		if(ev->button == Button1 && (arrange == dofloat || c->isfloat)) {
+			restack();
+			movemouse(c);
+		}
+		else if(ev->button == Button2)
+			zoom(NULL);
+		else if(ev->button == Button3 && (arrange == dofloat || c->isfloat) &&
+				!c->isfixed) {
+			restack();
+			resizemouse(c);
+		}
+	}
+}
+
+static void
+configurerequest(XEvent *e) {
+	unsigned long newmask;
+	Client *c;
+	XConfigureRequestEvent *ev = &e->xconfigurerequest;
+	XWindowChanges wc;
+
+	if((c = getclient(ev->window))) {
+		c->ismax = False;
+		if(ev->value_mask & CWX)
+			c->x = ev->x;
+		if(ev->value_mask & CWY)
+			c->y = ev->y;
+		if(ev->value_mask & CWWidth)
+			c->w = ev->width;
+		if(ev->value_mask & CWHeight)
+			c->h = ev->height;
+		if(ev->value_mask & CWBorderWidth)
+			c->border = ev->border_width;
+		wc.x = c->x;
+		wc.y = c->y;
+		wc.width = c->w;
+		wc.height = c->h;
+		newmask = ev->value_mask & (~(CWSibling | CWStackMode | CWBorderWidth));
+		if(newmask)
+			XConfigureWindow(dpy, c->win, newmask, &wc);
+		else
+			configure(c);
+		XSync(dpy, False);
+		if(c->isfloat) {
+			resize(c, False);
+			if(!isvisible(c))
+				XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+		}
+		else
+			arrange();
+	}
+	else {
+		wc.x = ev->x;
+		wc.y = ev->y;
+		wc.width = ev->width;
+		wc.height = ev->height;
+		wc.border_width = ev->border_width;
+		wc.sibling = ev->above;
+		wc.stack_mode = ev->detail;
+		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
+		XSync(dpy, False);
+	}
+}
+
+static void
+destroynotify(XEvent *e) {
+	Client *c;
+	XDestroyWindowEvent *ev = &e->xdestroywindow;
+
+	if((c = getclient(ev->window)))
+		unmanage(c);
+}
+
+static void
+enternotify(XEvent *e) {
+	Client *c;
+	XCrossingEvent *ev = &e->xcrossing;
+
+	if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
+		return;
+	if((c = getclient(ev->window)) && isvisible(c))
+		focus(c);
+	else if(ev->window == root) {
+		selscreen = True;
+		for(c = stack; c && !isvisible(c); c = c->snext);
+		focus(c);
+	}
+}
+
+static void
+expose(XEvent *e) {
+	XExposeEvent *ev = &e->xexpose;
+
+	if(ev->count == 0) {
+		if(barwin == ev->window)
+			drawstatus();
+	}
+}
+
+static void
+keypress(XEvent *e) {
+	static unsigned int len = sizeof key / sizeof key[0];
+	unsigned int i;
+	KeySym keysym;
+	XKeyEvent *ev = &e->xkey;
+
+	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
+	for(i = 0; i < len; i++) {
+		if(keysym == key[i].keysym
+			&& CLEANMASK(key[i].mod) == CLEANMASK(ev->state))
+		{
+			if(key[i].func)
+				key[i].func(&key[i].arg);
+		}
+	}
+}
+
+static void
+leavenotify(XEvent *e) {
+	XCrossingEvent *ev = &e->xcrossing;
+
+	if((ev->window == root) && !ev->same_screen) {
+		selscreen = False;
+		focus(NULL);
+	}
+}
+
+static void
+mappingnotify(XEvent *e) {
+	XMappingEvent *ev = &e->xmapping;
+
+	XRefreshKeyboardMapping(ev);
+	if(ev->request == MappingKeyboard)
+		grabkeys();
+}
+
+static void
+maprequest(XEvent *e) {
+	static XWindowAttributes wa;
+	XMapRequestEvent *ev = &e->xmaprequest;
+
+	if(!XGetWindowAttributes(dpy, ev->window, &wa))
+		return;
+	if(wa.override_redirect) {
+		XSelectInput(dpy, ev->window,
+				(StructureNotifyMask | PropertyChangeMask));
+		return;
+	}
+	if(!getclient(ev->window))
+		manage(ev->window, &wa);
+}
+
+static void
+propertynotify(XEvent *e) {
+	Client *c;
+	Window trans;
+	XPropertyEvent *ev = &e->xproperty;
+
+	if(ev->state == PropertyDelete)
+		return; /* ignore */
+	if((c = getclient(ev->window))) {
+		switch (ev->atom) {
+			default: break;
+			case XA_WM_TRANSIENT_FOR:
+				XGetTransientForHint(dpy, c->win, &trans);
+				if(!c->isfloat && (c->isfloat = (trans != 0)))
+					arrange();
+				break;
+			case XA_WM_NORMAL_HINTS:
+				updatesizehints(c);
+				break;
+		}
+		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
+			updatetitle(c);
+			if(c == sel)
+				drawstatus();
+		}
+	}
+}
+
+static void
+unmapnotify(XEvent *e) {
+	Client *c;
+	XUnmapEvent *ev = &e->xunmap;
+
+	if((c = getclient(ev->window)))
+		unmanage(c);
+}
+
+
+
+void (*handler[LASTEvent]) (XEvent *) = {
+	[ButtonPress] = buttonpress,
+	[ConfigureRequest] = configurerequest,
+	[DestroyNotify] = destroynotify,
+	[EnterNotify] = enternotify,
+	[LeaveNotify] = leavenotify,
+	[Expose] = expose,
+	[KeyPress] = keypress,
+	[MappingNotify] = mappingnotify,
+	[MapRequest] = maprequest,
+	[PropertyNotify] = propertynotify,
+	[UnmapNotify] = unmapnotify
+};
+
+void
+grabkeys(void) {
+	static unsigned int len = sizeof key / sizeof key[0];
+	unsigned int i;
+	KeyCode code;
+
+	XUngrabKey(dpy, AnyKey, AnyModifier, root);
+	for(i = 0; i < len; i++) {
+		code = XKeysymToKeycode(dpy, key[i].keysym);
+		XGrabKey(dpy, code, key[i].mod, root, True,
+				GrabModeAsync, GrabModeAsync);
+		XGrabKey(dpy, code, key[i].mod | LockMask, root, True,
+				GrabModeAsync, GrabModeAsync);
+		XGrabKey(dpy, code, key[i].mod | numlockmask, root, True,
+				GrabModeAsync, GrabModeAsync);
+		XGrabKey(dpy, code, key[i].mod | numlockmask | LockMask, root, True,
+				GrabModeAsync, GrabModeAsync);
+	}
+}
+
+void
+procevent(void) {
+	XEvent ev;
+
+	while(XPending(dpy)) {
+		XNextEvent(dpy, &ev);
+		if(handler[ev.type])
+			(handler[ev.type])(&ev); /* call handler */
+	}
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* from draw.c */
+/* static */
+
+static unsigned int
+textnw(const char *text, unsigned int len) {
+	XRectangle r;
+
+	if(dc.font.set) {
+		XmbTextExtents(dc.font.set, text, len, NULL, &r);
+		return r.width;
+	}
+	return XTextWidth(dc.font.xfont, text, len);
+}
+
+static void
+drawtext(const char *text, unsigned long col[ColLast]) {
+	int x, y, w, h;
+	static char buf[256];
+	unsigned int len, olen;
+	XGCValues gcv;
+	XRectangle r = { dc.x, dc.y, dc.w, dc.h };
+
+	XSetForeground(dpy, dc.gc, col[ColBG]);
+	XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
+	if(!text)
+		return;
+	w = 0;
+	olen = len = strlen(text);
+	if(len >= sizeof buf)
+		len = sizeof buf - 1;
+	memcpy(buf, text, len);
+	buf[len] = 0;
+	h = dc.font.ascent + dc.font.descent;
+	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
+	x = dc.x + (h / 2);
+	/* shorten text if necessary */
+	while(len && (w = textnw(buf, len)) > dc.w - h)
+		buf[--len] = 0;
+	if(len < olen) {
+		if(len > 1)
+			buf[len - 1] = '.';
+		if(len > 2)
+			buf[len - 2] = '.';
+		if(len > 3)
+			buf[len - 3] = '.';
+	}
+	if(w > dc.w)
+		return; /* too long */
+	gcv.foreground = col[ColFG];
+	if(dc.font.set) {
+		XChangeGC(dpy, dc.gc, GCForeground, &gcv);
+		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
+	} else {
+		gcv.font = dc.font.xfont->fid;
+		XChangeGC(dpy, dc.gc, GCForeground | GCFont, &gcv);
+		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
+	}
+}
+
+
+
+void
+drawstatus(void) {
+	int i, x;
+
+	dc.x = dc.y = 0;
+	for(i = 0; i < ntags; i++) {
+		dc.w = textw(tags[i]);
+		drawtext(tags[i], (seltag[i] ? dc.sel : dc.norm));
+		dc.x += dc.w + 1;
+	}
+	dc.w = bmw;
+	drawtext("", dc.norm);
+	x = dc.x + dc.w;
+	dc.w = textw(stext);
+	dc.x = sw - dc.w;
+	if(dc.x < x) {
+		dc.x = x;
+		dc.w = sw - x;
+	}
+	drawtext(stext, dc.norm);
+	if((dc.w = dc.x - x) > bh) {
+		dc.x = x;
+		drawtext(sel ? sel->name : NULL, dc.norm);
+	}
+	XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
+	XSync(dpy, False);
+}
+
+unsigned long
+getcolor(const char *colstr) {
+	Colormap cmap = DefaultColormap(dpy, screen);
+	XColor color;
+
+	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
+		eprint("error, cannot allocate color '%s'\n", colstr);
+	return color.pixel;
+}
+
+void
+setfont(const char *fontstr) {
+	char *def, **missing;
+	int i, n;
+
+	missing = NULL;
+	if(dc.font.set)
+		XFreeFontSet(dpy, dc.font.set);
+	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
+	if(missing) {
+		while(n--)
+			fprintf(stderr, "missing fontset: %s\n", missing[n]);
+		XFreeStringList(missing);
+	}
+	if(dc.font.set) {
+		XFontSetExtents *font_extents;
+		XFontStruct **xfonts;
+		char **font_names;
+		dc.font.ascent = dc.font.descent = 0;
+		font_extents = XExtentsOfFontSet(dc.font.set);
+		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
+		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
+			if(dc.font.ascent < (*xfonts)->ascent)
+				dc.font.ascent = (*xfonts)->ascent;
+			if(dc.font.descent < (*xfonts)->descent)
+				dc.font.descent = (*xfonts)->descent;
+			xfonts++;
+		}
+	} else {
+		if(dc.font.xfont)
+			XFreeFont(dpy, dc.font.xfont);
+		dc.font.xfont = NULL;
+		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr)))
+			eprint("error, cannot load font: '%s'\n", fontstr);
+		dc.font.ascent = dc.font.xfont->ascent;
+		dc.font.descent = dc.font.xfont->descent;
+	}
+	dc.font.height = dc.font.ascent + dc.font.descent;
+}
+
+unsigned int
+textw(const char *text) {
+	return textnw(text, strlen(text)) + dc.font.height;
+}
+
+
+
+
+
+
+
+
+
+
+
+/* from client.c */
+/* static */
+
+static void
+detachstack(Client *c) {
+	Client **tc;
+	for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
+	*tc = c->snext;
+}
+
+static void
+grabbuttons(Client *c, Bool focused) {
+	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
+
+	if(focused) {
+		XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+
+		XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+
+		XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+		XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+	} else {
+		XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
+				GrabModeAsync, GrabModeSync, None, None);
+	}
+}
+
+static void
+setclientstate(Client *c, long state) {
+	long data[] = {state, None};
+	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
+			PropModeReplace, (unsigned char *)data, 2);
+}
+
+static int
+xerrordummy(Display *dsply, XErrorEvent *ee) {
+	return 0;
+}
+
+
+
+void
+configure(Client *c) {
+	XEvent synev;
+
+	synev.type = ConfigureNotify;
+	synev.xconfigure.display = dpy;
+	synev.xconfigure.event = c->win;
+	synev.xconfigure.window = c->win;
+	synev.xconfigure.x = c->x;
+	synev.xconfigure.y = c->y;
+	synev.xconfigure.width = c->w;
+	synev.xconfigure.height = c->h;
+	synev.xconfigure.border_width = c->border;
+	synev.xconfigure.above = None;
+	XSendEvent(dpy, c->win, True, NoEventMask, &synev);
+}
+
+void
+focus(Client *c) {
+	if(c && !isvisible(c))
+		return;
+	if(sel && sel != c) {
+		grabbuttons(sel, False);
+		XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
+	}
+	if(c) {
+		detachstack(c);
+		c->snext = stack;
+		stack = c;
+		grabbuttons(c, True);
+	}
+	sel = c;
+	drawstatus();
+	if(!selscreen)
+		return;
+	if(c) {
+		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
+		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
+	} else {
+		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
+	}
+}
+
+Client *
+getclient(Window w) {
+	Client *c;
+
+	for(c = clients; c; c = c->next) {
+		if(c->win == w) {
+			return c;
+		}
+	}
+	return NULL;
+}
+
+Bool
+isprotodel(Client *c) {
+	int i, n;
+	Atom *protocols;
+	Bool ret = False;
+
+	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
+		for(i = 0; !ret && i < n; i++)
+			if(protocols[i] == wmatom[WMDelete])
+				ret = True;
+		XFree(protocols);
+	}
+	return ret;
+}
+
+void
+killclient(Arg *arg) {
+	if(!sel)
+		return;
+	if(isprotodel(sel))
+		sendevent(sel->win, wmatom[WMProtocols], wmatom[WMDelete]);
+	else
+		XKillClient(dpy, sel->win);
+}
+
+void
+manage(Window w, XWindowAttributes *wa) {
+	Client *c;
+	Window trans;
+
+	c = emallocz(sizeof(Client));
+	c->tags = emallocz(ntags * sizeof(Bool));
+	c->win = w;
+	c->x = wa->x;
+	c->y = wa->y;
+	c->w = wa->width;
+	c->h = wa->height;
+	if(c->w == sw && c->h == sh) {
+		c->border = 0;
+		c->x = sx;
+		c->y = sy;
+	} else {
+		c->border = BORDERPX;
+		if(c->x + c->w + 2 * c->border > wax + waw)
+			c->x = wax + waw - c->w - 2 * c->border;
+		if(c->y + c->h + 2 * c->border > way + wah)
+			c->y = way + wah - c->h - 2 * c->border;
+		if(c->x < wax)
+			c->x = wax;
+		if(c->y < way)
+			c->y = way;
+	}
+	updatesizehints(c);
+	XSelectInput(dpy, c->win,
+		StructureNotifyMask | PropertyChangeMask | EnterWindowMask);
+	XGetTransientForHint(dpy, c->win, &trans);
+	grabbuttons(c, False);
+	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
+	updatetitle(c);
+	settags(c, getclient(trans));
+	if(!c->isfloat)
+		c->isfloat = trans || c->isfixed;
+	if(clients)
+		clients->prev = c;
+	c->next = clients;
+	c->snext = stack;
+	stack = clients = c;
+	XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
+	XMapWindow(dpy, c->win);
+	setclientstate(c, NormalState);
+	if(isvisible(c))
+		focus(c);
+	arrange();
+}
+
+void
+resize(Client *c, Bool sizehints) {
+	float actual, dx, dy, max, min;
+	XWindowChanges wc;
+
+	if(c->w <= 0 || c->h <= 0)
+		return;
+	if(sizehints) {
+		if(c->minw && c->w < c->minw)
+			c->w = c->minw;
+		if(c->minh && c->h < c->minh)
+			c->h = c->minh;
+		if(c->maxw && c->w > c->maxw)
+			c->w = c->maxw;
+		if(c->maxh && c->h > c->maxh)
+			c->h = c->maxh;
+		/* inspired by algorithm from fluxbox */
+		if(c->minay > 0 && c->maxay && (c->h - c->baseh) > 0) {
+			dx = (float)(c->w - c->basew);
+			dy = (float)(c->h - c->baseh);
+			min = (float)(c->minax) / (float)(c->minay);
+			max = (float)(c->maxax) / (float)(c->maxay);
+			actual = dx / dy;
+			if(max > 0 && min > 0 && actual > 0) {
+				if(actual < min) {
+					dy = (dx * min + dy) / (min * min + 1);
+					dx = dy * min;
+					c->w = (int)dx + c->basew;
+					c->h = (int)dy + c->baseh;
+				}
+				else if(actual > max) {
+					dy = (dx * min + dy) / (max * max + 1);
+					dx = dy * min;
+					c->w = (int)dx + c->basew;
+					c->h = (int)dy + c->baseh;
+				}
+			}
+		}
+		if(c->incw)
+			c->w -= (c->w - c->basew) % c->incw;
+		if(c->inch)
+			c->h -= (c->h - c->baseh) % c->inch;
+	}
+	if(c->w == sw && c->h == sh)
+		c->border = 0;
+	else
+		c->border = BORDERPX;
+	/* offscreen appearance fixes */
+	if(c->x > sw)
+		c->x = sw - c->w - 2 * c->border;
+	if(c->y > sh)
+		c->y = sh - c->h - 2 * c->border;
+	if(c->x + c->w + 2 * c->border < sx)
+		c->x = sx;
+	if(c->y + c->h + 2 * c->border < sy)
+		c->y = sy;
+	wc.x = c->x;
+	wc.y = c->y;
+	wc.width = c->w;
+	wc.height = c->h;
+	wc.border_width = c->border;
+	XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
+	configure(c);
+	XSync(dpy, False);
+}
+
+void
+updatesizehints(Client *c) {
+	long msize;
+	XSizeHints size;
+
+	if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
+		size.flags = PSize;
+	c->flags = size.flags;
+	if(c->flags & PBaseSize) {
+		c->basew = size.base_width;
+		c->baseh = size.base_height;
+	} else {
+		c->basew = c->baseh = 0;
+	}
+	if(c->flags & PResizeInc) {
+		c->incw = size.width_inc;
+		c->inch = size.height_inc;
+	} else {
+		c->incw = c->inch = 0;
+	}
+	if(c->flags & PMaxSize) {
+		c->maxw = size.max_width;
+		c->maxh = size.max_height;
+	} else {
+		c->maxw = c->maxh = 0;
+	}
+	if(c->flags & PMinSize) {
+		c->minw = size.min_width;
+		c->minh = size.min_height;
+	} else {
+		c->minw = c->minh = 0;
+	}
+	if(c->flags & PAspect) {
+		c->minax = size.min_aspect.x;
+		c->minay = size.min_aspect.y;
+		c->maxax = size.max_aspect.x;
+		c->maxay = size.max_aspect.y;
+	} else {
+		c->minax = c->minay = c->maxax = c->maxay = 0;
+	}
+	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh &&
+				c->maxw == c->minw && c->maxh == c->minh);
+}
+
+void
+updatetitle(Client *c) {
+	char **list = NULL;
+	int n;
+	XTextProperty name;
+
+	name.nitems = 0;
+	c->name[0] = 0;
+	XGetTextProperty(dpy, c->win, &name, netatom[NetWMName]);
+	if(!name.nitems)
+		XGetWMName(dpy, c->win, &name);
+	if(!name.nitems)
+		return;
+	if(name.encoding == XA_STRING)
+		strncpy(c->name, (char *)name.value, sizeof c->name);
+	else {
+		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
+			strncpy(c->name, *list, sizeof c->name);
+			XFreeStringList(list);
+		}
+	}
+	XFree(name.value);
+}
+
+void
+unmanage(Client *c) {
+	Client *nc;
+
+	/* The server grab construct avoids race conditions. */
+	XGrabServer(dpy);
+	XSetErrorHandler(xerrordummy);
+	detach(c);
+	detachstack(c);
+	if(sel == c) {
+		for(nc = stack; nc && !isvisible(nc); nc = nc->snext);
+		focus(nc);
+	}
+	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
+	setclientstate(c, WithdrawnState);
+	free(c->tags);
+	free(c);
+	XSync(dpy, False);
+	XSetErrorHandler(xerror);
+	XUngrabServer(dpy);
+	arrange();
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/* static */
+
+
+static void
+cleanup(void) {
+	close(STDIN_FILENO);
+	while(stack) {
+		resize(stack, True);
+		unmanage(stack);
+	}
+	if(dc.font.set)
+		XFreeFontSet(dpy, dc.font.set);
+	else
+		XFreeFont(dpy, dc.font.xfont);
+	XUngrabKey(dpy, AnyKey, AnyModifier, root);
+	XFreePixmap(dpy, dc.drawable);
+	XFreeGC(dpy, dc.gc);
+	XDestroyWindow(dpy, barwin);
+	XFreeCursor(dpy, cursor[CurNormal]);
+	XFreeCursor(dpy, cursor[CurResize]);
+	XFreeCursor(dpy, cursor[CurMove]);
+	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
+	XSync(dpy, False);
+	free(seltag);
+}
+
+static void
+scan(void) {
+	unsigned int i, num;
+	Window *wins, d1, d2;
+	XWindowAttributes wa;
+
+	wins = NULL;
+	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
+		for(i = 0; i < num; i++) {
+			if(!XGetWindowAttributes(dpy, wins[i], &wa))
+				continue;
+			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
+				continue;
+			if(wa.map_state == IsViewable)
+				manage(wins[i], &wa);
+		}
+	}
+	if(wins)
+		XFree(wins);
+}
+
+static void
+setup(void) {
+	int i, j;
+	unsigned int mask;
+	Window w;
+	XModifierKeymap *modmap;
+	XSetWindowAttributes wa;
+
+	/* init atoms */
+	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
+	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
+	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
+	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
+	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
+	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
+			PropModeReplace, (unsigned char *) netatom, NetLast);
+	/* init cursors */
+	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
+	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
+	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
+	/* init modifier map */
+	numlockmask = 0;
+	modmap = XGetModifierMapping(dpy);
+	for (i = 0; i < 8; i++) {
+		for (j = 0; j < modmap->max_keypermod; j++) {
+			if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
+				numlockmask = (1 << i);
+		}
+	}
+	XFreeModifiermap(modmap);
+	/* select for events */
+	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
+		| EnterWindowMask | LeaveWindowMask;
+	wa.cursor = cursor[CurNormal];
+	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
+	grabkeys();
+	initrregs();
+	for(ntags = 0; tags[ntags]; ntags++);
+	seltag = emallocz(sizeof(Bool) * ntags);
+	seltag[0] = True;
+	/* style */
+	dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
+	dc.norm[ColBG] = getcolor(NORMBGCOLOR);
+	dc.norm[ColFG] = getcolor(NORMFGCOLOR);
+	dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
+	dc.sel[ColBG] = getcolor(SELBGCOLOR);
+	dc.sel[ColFG] = getcolor(SELFGCOLOR);
+	setfont(FONT);
+	/* geometry */
+	sx = sy = 0;
+	sw = DisplayWidth(dpy, screen);
+	sh = DisplayHeight(dpy, screen);
+	nmaster = NMASTER;
+	bmw = 1;
+	/* bar */
+	dc.h = bh = dc.font.height + 2;
+	wa.override_redirect = 1;
+	wa.background_pixmap = ParentRelative;
+	wa.event_mask = ButtonPressMask | ExposureMask;
+	barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
+			DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
+			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
+	XDefineCursor(dpy, barwin, cursor[CurNormal]);
+	XMapRaised(dpy, barwin);
+	strcpy(stext, "dwm-"VERSION);
+	/* windowarea */
+	wax = sx;
+	way = sy + bh;
+	wah = sh - bh;
+	waw = sw;
+	/* pixmap for everything */
+	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
+	dc.gc = XCreateGC(dpy, root, 0, 0);
+	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
+	/* multihead support */
+	selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
+}
+
+/*
+ * Startup Error handler to check if another window manager
+ * is already running.
+ */
+static int
+xerrorstart(Display *dsply, XErrorEvent *ee) {
+	otherwm = True;
+	return -1;
+}
+
+
+
+void
+sendevent(Window w, Atom a, long value) {
+	XEvent e;
+
+	e.type = ClientMessage;
+	e.xclient.window = w;
+	e.xclient.message_type = a;
+	e.xclient.format = 32;
+	e.xclient.data.l[0] = value;
+	e.xclient.data.l[1] = CurrentTime;
+	XSendEvent(dpy, w, False, NoEventMask, &e);
+	XSync(dpy, False);
+}
+
+void
+quit(Arg *arg) {
+	readin = running = False;
+}
+
+/* There's no way to check accesses to destroyed windows, thus those cases are
+ * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
+ * default error handler, which may call exit.
+ */
+int
+xerror(Display *dpy, XErrorEvent *ee) {
+	if(ee->error_code == BadWindow
+	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
+	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
+	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
+	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
+	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
+	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
+	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
+		return 0;
+	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
+		ee->request_code, ee->error_code);
+	return xerrorxlib(dpy, ee); /* may call exit */
+}
+
+int
+main(int argc, char *argv[]) {
+	char *p;
+	int r, xfd;
+	fd_set rd;
+
+	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
+		fputs("dwm-"VERSION", (C)opyright MMVI-MMVII Anselm R. Garbe\n", stdout);
+		exit(EXIT_SUCCESS);
+	}
+	else if(argc != 1)
+		eprint("usage: dwm [-v]\n");
+	setlocale(LC_CTYPE, "");
+	dpy = XOpenDisplay(0);
+	if(!dpy)
+		eprint("dwm: cannot open display\n");
+	xfd = ConnectionNumber(dpy);
+	screen = DefaultScreen(dpy);
+	root = RootWindow(dpy, screen);
+	otherwm = False;
+	XSetErrorHandler(xerrorstart);
+	/* this causes an error if some other window manager is running */
+	XSelectInput(dpy, root, SubstructureRedirectMask);
+	XSync(dpy, False);
+	if(otherwm)
+		eprint("dwm: another window manager is already running\n");
+
+	XSync(dpy, False);
+	XSetErrorHandler(NULL);
+	xerrorxlib = XSetErrorHandler(xerror);
+	XSync(dpy, False);
+	setup();
+	drawstatus();
+	scan();
+
+	/* main event loop, also reads status text from stdin */
+	XSync(dpy, False);
+	procevent();
+	readin = True;
+	while(running) {
+		FD_ZERO(&rd);
+		if(readin)
+			FD_SET(STDIN_FILENO, &rd);
+		FD_SET(xfd, &rd);
+		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
+			if(errno == EINTR)
+				continue;
+			eprint("select failed\n");
+		}
+		if(FD_ISSET(STDIN_FILENO, &rd)) {
+			switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
+			case -1:
+				strncpy(stext, strerror(errno), sizeof stext - 1);
+				stext[sizeof stext - 1] = '\0';
+				readin = False;
+				break;
+			case 0:
+				strncpy(stext, "EOF", 4);
+				readin = False;
+				break;
+			default:
+				for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
+				for(; p >= stext && *p != '\n'; --p);
+				if(p > stext)
+					strncpy(stext, p + 1, sizeof stext);
+			}
+			drawstatus();
+		}
+		if(FD_ISSET(xfd, &rd))
+			procevent();
+	}
+	cleanup();
+	XCloseDisplay(dpy);
+	return 0;
+}