text: /* See LICENSE file for copyright and 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.
   *
   * 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 linked client
   * list on each monitor, the focus history is remembered through a stack list
   * on each monitor. Each client contains a bit array to indicate the tags of a
   * client.
   *
   * Keys and tagging rules are organized as arrays and defined in config.h.
   *
   * To understand everything else, start reading main().
   */
  #include <X11/XF86keysym.h>
  #include <X11/Xatom.h>
  #include <X11/Xlib.h>
  #include <X11/Xproto.h>
  #include <X11/Xutil.h>
  #include <X11/cursorfont.h>
  #include <X11/keysym.h>
  #include <errno.h>
  #include <locale.h>
  #include <pthread.h>
  #include <signal.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/statvfs.h>
  #include <sys/types.h>
  #include <sys/wait.h>
  #include <time.h>
  #include <unistd.h>
  
  #ifdef XINERAMA
  #	include <X11/extensions/Xinerama.h>
  #endif /* XINERAMA */
  #include "drw.h"
  #include "util.h"
  
  #include <X11/Xft/Xft.h>
  
  /* macros */
  #define BUTTONMASK				 (ButtonPressMask | ButtonReleaseMask)
  #define CLEANMASK(mask)			 (mask & ~(numlockmask | LockMask) & (ShiftMask | ControlMask | Mod1Mask | Mod2Mask | Mod3Mask | Mod4Mask | Mod5Mask))
  #define INTERSECT(x, y, w, h, m) (MAX(0, MIN((x) + (w), (m)->wx + (m)->ww) - MAX((x), (m)->wx)) \
  								  * MAX(0, MIN((y) + (h), (m)->wy + (m)->wh) - MAX((y), (m)->wy)))
  #define ISVISIBLE(C) ((C->tags & C->mon->tagset[C->mon->seltags]))
  #define LENGTH(X)	 (sizeof X / sizeof X[0])
  #define MOUSEMASK	 (BUTTONMASK | PointerMotionMask)
  #define WIDTH(X)	 ((X)->w + 2 * (X)->bw)
  #define HEIGHT(X)	 ((X)->h + 2 * (X)->bw)
  #define TAGMASK		 ((1 << LENGTH(tags)) - 1)
  #define TEXTW(X)	 (drw_fontset_getwidth(drw, (X)) + lrpad)
  
  /* enums */
  enum {
  	CurNormal,
  	CurResize,
  	CurMove,
  	CurLast,
  }; /* cursor */
  enum {
  	SchemeNorm,
  	SchemeSel,
  }; /* color schemes */
  enum {
  	NetSupported,
  	NetWMName,
  	NetWMState,
  	NetWMCheck,
  	NetWMFullscreen,
  	NetActiveWindow,
  	NetWMWindowType,
  	NetWMWindowTypeDialog,
  	NetClientList,
  	NetWMWindowOpacity,
  	NetLast,
  }; /* EWMH atoms */
  enum {
  	WMProtocols,
  	WMDelete,
  	WMState,
  	WMTakeFocus,
  	WMLast,
  }; /* default atoms */
  enum {
  	ClkTagBar,
  	ClkLtSymbol,
  	ClkStatusText,
  	ClkWinTitle,
  	ClkClientWin,
  	ClkRootWin,
  	ClkLast,
  }; /* clicks */
  
  typedef union {
  	int			i;
  	unsigned	ui;
  	float		f;
  	const void *v;
  } Arg;
  
  typedef struct {
  	unsigned click;
  	unsigned mask;
  	unsigned button;
  	void (*func)(const Arg *arg);
  	const Arg arg;
  } Button;
  
  typedef struct Monitor Monitor;
  typedef struct Client  Client;
  struct Client {
  	char	 name[256];
  	float	 mina, maxa;
  	int		 x, y, w, h;
  	int		 oldx, oldy, oldw, oldh;
  	int		 basew, baseh, incw, inch, maxw, maxh, minw, minh;
  	int		 bw, oldbw;
  	unsigned tags;
  	int		 isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  	Client  *next;
  	Client  *snext;
  	Monitor *mon;
  	Window	 win;
  };
  
  typedef struct {
  	unsigned mod;
  	KeySym	 keysym;
  	void (*func)(const Arg *);
  	const Arg arg;
  } Key;
  
  typedef struct {
  	const char *symbol;
  	void (*arrange)(Monitor *);
  } Layout;
  
  struct Monitor {
  	char		  ltsymbol[16];
  	float		  mfact;
  	int			  nmaster;
  	int			  num;
  	int			  by;			  /* bar geometry */
  	int			  mx, my, mw, mh; /* screen size */
  	int			  wx, wy, ww, wh; /* window area  */
  	unsigned	  seltags;
  	unsigned	  sellt;
  	unsigned	  tagset[2];
  	int			  showbar;
  	int			  topbar;
  	Client	   *clients;
  	Client	   *sel;
  	Client	   *stack;
  	Monitor		*next;
  	Window		  barwin;
  	const Layout *lt[2];
  };
  
  typedef struct {
  	const char *class;
  	const char *instance;
  	const char *title;
  	unsigned	tags;
  	int			isfloating;
  	int			monitor;
  } Rule;
  
  /* function declarations */
  static void		applyrules(Client *c);
  static int		applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
  static void		arrange(Monitor *m);
  static void		arrangemon(Monitor *m);
  static void		attach(Client *c);
  static void		attachstack(Client *c);
  static void		buttonpress(XEvent *e);
  static void		change_brighness(const Arg *arg);
  static void		checkotherwm(void);
  static void		cleanup(void);
  static void		cleanupmon(Monitor *mon);
  static void		clientmessage(XEvent *e);
  static void		configure(Client *c);
  static void		configurenotify(XEvent *e);
  static void		configurerequest(XEvent *e);
  static Monitor *createmon(void);
  static void		destroynotify(XEvent *e);
  static void		detach(Client *c);
  static void		detachstack(Client *c);
  static Monitor *dirtomon(int dir);
  static void		drawbar(Monitor *m);
  static void		drawbars(void);
  static void		enternotify(XEvent *e);
  static void		expose(XEvent *e);
  static void		opacify(Client *c, double opacity);
  static void		focus(Client *c);
  static void		focusin(XEvent *e);
  static void		focusmon(const Arg *arg);
  static void		focusstack(const Arg *arg);
  static Atom		getatomprop(Client *c, Atom prop);
  static int		getrootptr(int *x, int *y);
  static long		getstate(Window w);
  static int		gettextprop(Window w, Atom atom, char *text, unsigned int size);
  static void		grabbuttons(Client *c, int focused);
  static void		grabkeys(void);
  static void		incnmaster(const Arg *arg);
  static void		keypress(XEvent *e);
  static void		killclient(const Arg *arg);
  static void		manage(Window w, XWindowAttributes *wa);
  static void		mappingnotify(XEvent *e);
  static void		maprequest(XEvent *e);
  static void		monocle(Monitor *m);
  static void		motionnotify(XEvent *e);
  static void		movemouse(const Arg *arg);
  static Client  *nexttiled(Client *c);
  static void		pop(Client *);
  static void		propertynotify(XEvent *e);
  static void		quit(const Arg *arg);
  static Monitor *recttomon(int x, int y, int w, int h);
  static void		resize(Client *c, int x, int y, int w, int h, int interact);
  static void		resizeclient(Client *c, int x, int y, int w, int h);
  static void		resizemouse(const Arg *arg);
  static void		restack(Monitor *m);
  static void		run(void);
  static void		scan(void);
  static int		sendevent(Client *c, Atom proto);
  static void		sendmon(Client *c, Monitor *m);
  static void		setborderpx(const Arg *arg);
  static void		setclientstate(Client *c, long state);
  static void		setfocus(Client *c);
  static void		setfullscreen(Client *c, int fullscreen);
  static void		setlayout(const Arg *arg);
  static void		setmfact(const Arg *arg);
  static void		setup(void);
  static void		seturgent(Client *c, int urg);
  static void		showhide(Client *c);
  static void		sigchld(int unused);
  static void		spawn(const Arg *arg);
  static void		tag(const Arg *arg);
  static void		tagmon(const Arg *arg);
  static void		tile(Monitor *);
  static void		togglebar(const Arg *arg);
  static void		togglefloating(const Arg *arg);
  static void		toggletag(const Arg *arg);
  static void		toggleview(const Arg *arg);
  static void		unfocus(Client *c, int setfocus);
  static void		unmanage(Client *c, int destroyed);
  static void		unmapnotify(XEvent *e);
  static void		updatebarpos(Monitor *m);
  static void		updatebars(void);
  static void		updateclientlist(void);
  static int		updategeom(void);
  static void		updatenumlockmask(void);
  static void		updatesizehints(Client *c);
  static void		updatestatus(void);
  static void		do_update_statusbar(const Arg *ignored);
  static void		updatetitle(Client *c);
  static void		updatewindowtype(Client *c);
  static void		updatewmhints(Client *c);
  static void		view(const Arg *arg);
  static Client  *wintoclient(Window w);
  static Monitor *wintomon(Window w);
  static int		xerror(Display *dpy, XErrorEvent *ee);
  static int		xerrordummy(Display *dpy, XErrorEvent *ee);
  static int		xerrorstart(Display *dpy, XErrorEvent *ee);
  static void		zoom(const Arg *arg);
  
  /// EXTENSIONS
  pthread_t thread_update_status_bar;
  
  void		atexit_thread_cancel(void);
  static long get_num_between(char *str, char from, char to);
  static void kib_to_str(char *buffer, size_t kib, char digits);
  static void do_update_statusbar(const Arg *unused);
  void		 *thread_run_update_statusbar(void *unused);
  void		set_wallpaper(const Arg *unused);
  void		lock_screen(const Arg *unused);
  
  /* variables */
  static const char broken[] = "broken";
  static char		  stext[256];
  static int		  screen;
  static int		  sw, sh;	   /* X display screen geometry width, height */
  static int		  bh, blw = 0; /* bar geometry */
  static int		  lrpad;	   /* sum of left and right padding for text */
  static int (*xerrorxlib)(Display *, XErrorEvent *);
  static unsigned numlockmask					= 0;
  static void (*handler[LASTEvent])(XEvent *) = {
  	[ButtonPress]	   = buttonpress,
  	[ClientMessage]	   = clientmessage,
  	[ConfigureRequest] = configurerequest,
  	[ConfigureNotify]  = configurenotify,
  	[DestroyNotify]	   = destroynotify,
  	[EnterNotify]	   = enternotify,
  	[Expose]		   = expose,
  	[FocusIn]		   = focusin,
  	[KeyPress]		   = keypress,
  	[MappingNotify]	   = mappingnotify,
  	[MapRequest]	   = maprequest,
  	[MotionNotify]	   = motionnotify,
  	[PropertyNotify]   = propertynotify,
  	[UnmapNotify]	   = unmapnotify,
  };
  static Atom		wmatom[WMLast], netatom[NetLast];
  static int		running = 1;
  static Cur	   *cursor[CurLast];
  static Clr	   **scheme;
  static Display *dpy;
  static Drw	   *drw;
  static Monitor *mons, *selmon;
  static Window	root, wmcheckwin;
  
  /* configuration, allows nested code to access above variables */
  #include "config.h"
  
  /* compile-time check if all tags fit into an unsigned bit array. */
  _Static_assert(LENGTH(tags) <= 31, "Too many tags!");
  
  /* function implementations */
  void applyrules(Client *c) {
  	const char *class, *instance;
  	XClassHint ch = {NULL, NULL};
  
  	/* rule matching */
  	c->isfloating = 0;
  	c->tags		  = 0;
  	XGetClassHint(dpy, c->win, &ch);
  	class	 = ch.res_class ? ch.res_class : broken;
  	instance = ch.res_name ? ch.res_name : broken;
  
  	for (unsigned i = 0; i < LENGTH(rules); i++) {
  		const Rule *r = &rules[i];
  		if ((!r->title || strstr(c->name, r->title))
  			&& (!r->class || strstr(class, r->class))
  			&& (!r->instance || strstr(instance, r->instance))) {
  			c->isfloating = r->isfloating;
  			c->tags |= r->tags;
  			Monitor *m;
  			for (m = mons; m && m->num != r->monitor; m = m->next) {}
  			if (m) c->mon = m;
  		}
  	}
  	if (ch.res_class) XFree(ch.res_class);
  	if (ch.res_name) XFree(ch.res_name);
  	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
  }
  
  int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact) {
  	/* set minimum possible */
  	*w = MAX(1, *w);
  	*h = MAX(1, *h);
  	if (interact) {
  		if (*x > sw) *x = sw - WIDTH(c);
  		if (*y > sh) *y = sh - HEIGHT(c);
  		if (*x + *w + 2 * c->bw < 0) *x = 0;
  		if (*y + *h + 2 * c->bw < 0) *y = 0;
  	} else {
  		Monitor *m = c->mon;
  		if (*x >= m->wx + m->ww) *x = m->wx + m->ww - WIDTH(c);
  		if (*y >= m->wy + m->wh) *y = m->wy + m->wh - HEIGHT(c);
  		if (*x + *w + 2 * c->bw <= m->wx) *x = m->wx;
  		if (*y + *h + 2 * c->bw <= m->wy) *y = m->wy;
  	}
  	if (*h < bh) *h = bh;
  	if (*w < bh) *w = bh;
  
  	/// always true by default but may be changed in config
  	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
  		/* see last two sentences in ICCCM 4.1.2.3 */
  		int baseismin = c->basew == c->minw && c->baseh == c->minh;
  		if (!baseismin) { /* temporarily remove base dimensions */
  			*w -= c->basew;
  			*h -= c->baseh;
  		}
  		/* adjust for aspect limits */
  		if (c->mina > 0 && c->maxa > 0) {
  			if (c->maxa < (float) *w / *h) *w = *h * c->maxa + 0.5;
  			else if (c->mina < (float) *h / *w) *h = *w * c->mina + 0.5;
  		}
  		if (baseismin) { /* increment calculation requires this */
  			*w -= c->basew;
  			*h -= c->baseh;
  		}
  		/* adjust for increment value */
  		if (c->incw) *w -= *w % c->incw;
  		if (c->inch) *h -= *h % c->inch;
  		/* restore base dimensions */
  		*w = MAX(*w + c->basew, c->minw);
  		*h = MAX(*h + c->baseh, c->minh);
  		if (c->maxw) *w = MIN(*w, c->maxw);
  		if (c->maxh) *h = MIN(*h, c->maxh);
  	}
  
  	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
  }
  
  void arrange(Monitor *m) {
  	if (m) showhide(m->stack);
  	else
  		for (m = mons; m; m = m->next) showhide(m->stack);
  	if (m) {
  		arrangemon(m);
  		restack(m);
  	} else
  		for (m = mons; m; m = m->next) arrangemon(m);
  }
  
  void arrangemon(Monitor *m) {
  	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
  	if (m->lt[m->sellt]->arrange)
  		m->lt[m->sellt]->arrange(m);
  }
  
  void attach(Client *c) {
  	c->next			= c->mon->clients;
  	c->mon->clients = c;
  }
  
  void attachstack(Client *c) {
  	c->snext	  = c->mon->stack;
  	c->mon->stack = c;
  }
  
  void buttonpress(XEvent *e) {
  	unsigned			 i, x, click;
  	Arg					 arg = {0};
  	Client			   *c;
  	Monitor				*m;
  	XButtonPressedEvent *ev = &e->xbutton;
  
  	click = ClkRootWin;
  	/* focus monitor if necessary */
  	if ((m = wintomon(ev->window)) && m != selmon) {
  		unfocus(selmon->sel, 1);
  		selmon = m;
  		focus(NULL);
  	}
  	if (ev->window == selmon->barwin) {
  		i = x = 0;
  		do x += TEXTW(tags[i]);
  		while (ev->x >= x && ++i < LENGTH(tags));
  		if (i < LENGTH(tags)) {
  			click  = ClkTagBar;
  			arg.ui = 1 << i;
  		} else if (ev->x < x + blw) click = ClkLtSymbol;
  		else if (ev->x > selmon->ww - (int) TEXTW(stext)) click = ClkStatusText;
  		else click = ClkWinTitle;
  	} else if ((c = wintoclient(ev->window))) {
  		focus(c);
  		restack(selmon);
  		XAllowEvents(dpy, ReplayPointer, CurrentTime);
  		click = ClkClientWin;
  	}
  	for (i = 0; i < LENGTH(buttons); i++)
  		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
  			&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
  			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
  }
  
  void change_brighness(const Arg *arg) {
  	static float brightness = 1.0f;
  	static char	 buffer[10];
  	static char *brightness_commmand[] = {"xrandr", "--output", "eDP-1", "--brightness", buffer, NULL};
  	memset(buffer, 0, sizeof buffer);
  
  	brightness += arg->f;
  	brightness = CLAMP(brightness, 0.1f, 1.0f);
  
  	sprintf(buffer, "%f", brightness);
  	const Arg a = {.v = brightness_commmand};
  	spawn(&a);
  }
  
  void checkotherwm(void) {
  	xerrorxlib = XSetErrorHandler(xerrorstart);
  	/* this causes an error if some other window manager is running */
  	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
  	XSync(dpy, False);
  	XSetErrorHandler(xerror);
  	XSync(dpy, False);
  }
  
  void cleanup(void) {
  	Arg		 a	 = {.ui = ~0};
  	Layout	 foo = {"", NULL};
  	Monitor *m;
  	size_t	 i;
  
  	view(&a);
  	selmon->lt[selmon->sellt] = &foo;
  	for (m = mons; m; m = m->next)
  		while (m->stack) unmanage(m->stack, 0);
  	XUngrabKey(dpy, AnyKey, AnyModifier, root);
  	while (mons) cleanupmon(mons);
  	for (i = 0; i < CurLast; i++) drw_cur_free(drw, cursor[i]);
  	for (i = 0; i < LENGTH(colors); i++) free(scheme[i]);
  	XDestroyWindow(dpy, wmcheckwin);
  	drw_free(drw);
  	XSync(dpy, False);
  	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
  	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
  }
  
  void cleanupmon(Monitor *mon) {
  	Monitor *m;
  
  	if (mon == mons) mons = mons->next;
  	else {
  		for (m = mons; m && m->next != mon; m = m->next) {}
  		m->next = mon->next;
  	}
  	XUnmapWindow(dpy, mon->barwin);
  	XDestroyWindow(dpy, mon->barwin);
  	free(mon);
  }
  
  void clientmessage(XEvent *e) {
  	XClientMessageEvent *cme = &e->xclient;
  	Client			   *c	 = wintoclient(cme->window);
  
  	if (!c) return;
  	if (cme->message_type == netatom[NetWMState]) {
  		if (cme->data.l[1] == netatom[NetWMFullscreen]
  			|| cme->data.l[2] == netatom[NetWMFullscreen])
  			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
  								 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
  	} else if (cme->message_type == netatom[NetActiveWindow])
  		if (c != selmon->sel && !c->isurgent) seturgent(c, 1);
  }
  
  void configure(Client *c) {
  	XConfigureEvent ce;
  
  	ce.type				 = ConfigureNotify;
  	ce.display			 = dpy;
  	ce.event			 = c->win;
  	ce.window			 = c->win;
  	ce.x				 = c->x;
  	ce.y				 = c->y;
  	ce.width			 = c->w;
  	ce.height			 = c->h;
  	ce.border_width		 = c->bw;
  	ce.above			 = None;
  	ce.override_redirect = False;
  
  	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *) &ce);
  }
  
  void configurenotify(XEvent *e) {
  	Monitor			*m;
  	Client		   *c;
  	XConfigureEvent *ev = &e->xconfigure;
  	int				 dirty;
  
  	/* TODO: updategeom handling sucks, needs to be simplified */
  	if (ev->window == root) {
  		dirty = (sw != ev->width || sh != ev->height);
  		sw	  = ev->width;
  		sh	  = ev->height;
  		if (updategeom() || dirty) {
  			drw_resize(drw, sw, bh);
  			updatebars();
  			for (m = mons; m; m = m->next) {
  				for (c = m->clients; c; c = c->next)
  					if (c->isfullscreen) resizeclient(c, m->mx, m->my, m->mw, m->mh);
  				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
  			}
  			focus(NULL);
  			arrange(NULL);
  		}
  	}
  }
  
  void configurerequest(XEvent *e) {
  	Client				   *c;
  	Monitor				*m;
  	XConfigureRequestEvent *ev = &e->xconfigurerequest;
  	XWindowChanges			wc;
  
  	if ((c = wintoclient(ev->window))) {
  		if (ev->value_mask & CWBorderWidth) c->bw = ev->border_width;
  		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
  			m = c->mon;
  			if (ev->value_mask & CWX) {
  				c->oldx = c->x;
  				c->x	= m->mx + ev->x;
  			}
  			if (ev->value_mask & CWY) {
  				c->oldy = c->y;
  				c->y	= m->my + ev->y;
  			}
  			if (ev->value_mask & CWWidth) {
  				c->oldw = c->w;
  				c->w	= ev->width;
  			}
  			if (ev->value_mask & CWHeight) {
  				c->oldh = c->h;
  				c->h	= ev->height;
  			}
  			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
  				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
  			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
  				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
  			if ((ev->value_mask & (CWX | CWY)) && !(ev->value_mask & (CWWidth | CWHeight)))
  				configure(c);
  			if (ISVISIBLE(c)) XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
  		} else configure(c);
  	} 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);
  }
  
  Monitor *createmon(void) {
  	Monitor *m;
  
  	m			 = ecalloc(1, sizeof(Monitor));
  	m->tagset[0] = m->tagset[1] = 1;
  	m->mfact					= mfact;
  	m->nmaster					= nmaster;
  	m->showbar					= showbar;
  	m->topbar					= topbar;
  	m->lt[0]					= &layouts[0];
  	m->lt[1]					= &layouts[1 % LENGTH(layouts)];
  	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
  
  	return m;
  }
  
  void destroynotify(XEvent *e) {
  	Client			   *c;
  	XDestroyWindowEvent *ev = &e->xdestroywindow;
  
  	if ((c = wintoclient(ev->window))) unmanage(c, 1);
  }
  
  void detach(Client *c) {
  	Client **tc;
  
  	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next) {}
  	*tc = c->next;
  }
  
  void detachstack(Client *c) {
  	Client **tc, *t;
  
  	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext) {}
  	*tc = c->snext;
  
  	if (c == c->mon->sel) {
  		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext) {}
  		c->mon->sel = t;
  	}
  }
  
  Monitor *dirtomon(int dir) {
  	Monitor *m = NULL;
  
  	if (dir > 0) {
  		if (!(m = selmon->next)) m = mons;
  	} else if (selmon == mons)
  		for (m = mons; m->next; m = m->next) {}
  	else
  		for (m = mons; m->next != selmon; m = m->next) {}
  	return m;
  }
  
  void drawbar(Monitor *m) {
  	int		 x, w, tw = 0;
  	int		 boxs = drw->fonts->h / 9;
  	int		 boxw = drw->fonts->h / 6 + 2;
  	unsigned i, occ = 0, urg = 0;
  	Client  *c;
  
  	/* draw status first so it can be overdrawn by tags later */
  	if (m == selmon) { /* status is only drawn on selected monitor */
  		drw_setscheme(drw, scheme[SchemeNorm]);
  		tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
  		drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
  	}
  
  	for (c = m->clients; c; c = c->next) {
  		occ |= c->tags;
  		if (c->isurgent) urg |= c->tags;
  	}
  	x = 0;
  	for (i = 0; i < LENGTH(tags); i++) {
  		w = TEXTW(tags[i]);
  		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
  		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
  		if (occ & 1 << i) drw_rect(drw, x + boxs, boxs, boxw, boxw,
  			m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
  			urg & 1 << i);
  		x += w;
  	}
  	w = blw = TEXTW(m->ltsymbol);
  	drw_setscheme(drw, scheme[SchemeNorm]);
  	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
  
  	if ((w = m->ww - tw - x) > bh) {
  		if (m->sel) {
  			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
  			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
  			if (m->sel->isfloating) drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
  		} else {
  			drw_setscheme(drw, scheme[SchemeNorm]);
  			drw_rect(drw, x, 0, w, bh, 1, 1);
  		}
  	}
  	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
  }
  
  void drawbars(void) {
  	Monitor *m;
  	for (m = mons; m; m = m->next) drawbar(m);
  }
  
  void enternotify(XEvent *e) {
  	Client		   *c;
  	Monitor		*m;
  	XCrossingEvent *ev = &e->xcrossing;
  
  	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root) return;
  	c = wintoclient(ev->window);
  	m = c ? c->mon : wintomon(ev->window);
  	if (m != selmon) {
  		unfocus(selmon->sel, 1);
  		selmon = m;
  	} else if (!c || c == selmon->sel) return;
  	focus(c);
  }
  
  void expose(XEvent *e) {
  	Monitor		*m;
  	XExposeEvent *ev = &e->xexpose;
  	if (ev->count == 0 && (m = wintomon(ev->window))) drawbar(m);
  }
  
  void opacify(Client *c, double opacity) {
  	if (BETWEEN(opacity, 0, 1)) {
  		unsigned long real_opacity[] = {opacity * 0xffffffff};
  		XChangeProperty(dpy, c->win, netatom[NetWMWindowOpacity], XA_CARDINAL,
  			32, PropModeReplace, (unsigned char *) real_opacity, 1);
  	} else XDeleteProperty(dpy, c->win, netatom[NetWMWindowOpacity]);
  }
  
  void focus(Client *c) {
  	if (!c || !ISVISIBLE(c))
  		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext) {}
  	if (selmon->sel && selmon->sel != c) unfocus(selmon->sel, 0);
  	if (c) {
  		if (c->mon != selmon) selmon = c->mon;
  		if (c->isurgent) seturgent(c, 0);
  		detachstack(c);
  		attachstack(c);
  		grabbuttons(c, 1);
  		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
  		setfocus(c);
  	} else {
  		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
  		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
  	}
  	selmon->sel = c;
  	drawbars();
  }
  
  /* there are some broken focus acquiring clients needing extra handling */
  void focusin(XEvent *e) {
  	XFocusChangeEvent *ev = &e->xfocus;
  
  	if (selmon->sel && ev->window != selmon->sel->win) setfocus(selmon->sel);
  }
  
  void focusmon(const Arg *arg) {
  	Monitor *m;
  
  	if (!mons->next) return;
  	if ((m = dirtomon(arg->i)) == selmon) return;
  	unfocus(selmon->sel, 0);
  	selmon = m;
  	focus(NULL);
  }
  
  void focusstack(const Arg *arg) {
  	Client *c = NULL, *i;
  
  	if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen)) return;
  	if (arg->i > 0) {
  		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next) {}
  		if (!c)
  			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next) {}
  	} else {
  		for (i = selmon->clients; i != selmon->sel; i = i->next)
  			if (ISVISIBLE(i)) c = i;
  		if (!c)
  			for (; i; i = i->next)
  				if (ISVISIBLE(i)) c = i;
  	}
  	if (c) {
  		focus(c);
  		restack(selmon);
  	}
  }
  
  Atom getatomprop(Client *c, Atom prop) {
  	int			   di;
  	unsigned long  dl;
  	unsigned char *p = NULL;
  	Atom		   da, atom = None;
  
  	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
  			&da, &di, &dl, &dl, &p)
  			== Success
  		&& p) {
  		atom = *(Atom *) p;
  		XFree(p);
  	}
  	return atom;
  }
  
  int getrootptr(int *x, int *y) {
  	int		 di;
  	unsigned dui;
  	Window	 dummy;
  
  	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
  }
  
  long getstate(Window w) {
  	int			   format;
  	long		   result = -1;
  	unsigned char *p	  = NULL;
  	unsigned long  n, extra;
  	Atom		   real;
  
  	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
  			&real, &format, &n, &extra, (unsigned char **) &p)
  		!= Success) return -1;
  	if (n != 0) result = *p;
  	XFree(p);
  	return result;
  }
  
  int gettextprop(Window w, Atom atom, char *text, unsigned size) {
  	char		 **list = NULL;
  	int			  n;
  	XTextProperty name;
  
  	if (!text || size == 0) return 0;
  	text[0] = '\0';
  	if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems) return 0;
  	if (name.encoding == XA_STRING) strncpy(text, (char *) name.value, size - 1);
  	else {
  		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
  			strncpy(text, *list, size - 1);
  			XFreeStringList(list);
  		}
  	}
  	text[size - 1] = '\0';
  	XFree(name.value);
  	return 1;
  }
  
  void grabbuttons(Client *c, int focused) {
  	updatenumlockmask();
  	{
  		unsigned i, j;
  		unsigned modifiers[] = {0, LockMask, numlockmask, numlockmask | LockMask};
  		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
  		if (!focused) XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
  			BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
  		for (i = 0; i < LENGTH(buttons); i++)
  			if (buttons[i].click == ClkClientWin)
  				for (j = 0; j < LENGTH(modifiers); j++) XGrabButton(dpy, buttons[i].button,
  					buttons[i].mask | modifiers[j],
  					c->win, False, BUTTONMASK,
  					GrabModeAsync, GrabModeSync, None, None);
  	}
  }
  
  void grabkeys(void) {
  	updatenumlockmask();
  	{
  		unsigned i, j;
  		unsigned modifiers[] = {0, LockMask, numlockmask, numlockmask | LockMask};
  		KeyCode	 code;
  
  		XUngrabKey(dpy, AnyKey, AnyModifier, root);
  		for (i = 0; i < LENGTH(keys); i++)
  			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
  				for (j = 0; j < LENGTH(modifiers); j++)
  					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
  						True, GrabModeAsync, GrabModeAsync);
  	}
  }
  
  void incnmaster(const Arg *arg) {
  	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
  	arrange(selmon);
  }
  
  #ifdef XINERAMA
  static int
  	isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
  	while (n--)
  		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
  			&& unique[n].width == info->width && unique[n].height == info->height) return 0;
  	return 1;
  }
  #endif /* XINERAMA */
  
  void keypress(XEvent *e) {
  	unsigned   i;
  	KeySym	   keysym;
  	XKeyEvent *ev;
  
  	ev	   = &e->xkey;
  	keysym = XKeycodeToKeysym(dpy, (KeyCode) ev->keycode, 0);
  	for (i = 0; i < LENGTH(keys); i++)
  		if (keysym == keys[i].keysym
  			&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
  			&& keys[i].func)
  			keys[i].func(&(keys[i].arg));
  }
  
  void killclient(const Arg *arg) {
  	if (!selmon->sel) return;
  	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
  		XGrabServer(dpy);
  		XSetErrorHandler(xerrordummy);
  		XSetCloseDownMode(dpy, DestroyAll);
  		XKillClient(dpy, selmon->sel->win);
  		XSync(dpy, False);
  		XSetErrorHandler(xerror);
  		XUngrabServer(dpy);
  	}
  }
  
  void manage(Window w, XWindowAttributes *wa) {
  	Client		   *c, *t = NULL;
  	Window		   trans = None;
  	XWindowChanges wc;
  
  	c	   = ecalloc(1, sizeof(Client));
  	c->win = w;
  	/* geometry */
  	c->x = c->oldx = wa->x;
  	c->y = c->oldy = wa->y;
  	c->w = c->oldw = wa->width;
  	c->h = c->oldh = wa->height;
  	c->oldbw	   = wa->border_width;
  
  	updatetitle(c);
  	opacify(c, defaultopacity);
  	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
  		c->mon	= t->mon;
  		c->tags = t->tags;
  	} else {
  		c->mon = selmon;
  		applyrules(c);
  	}
  
  	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw) c->x = c->mon->mx + c->mon->mw - WIDTH(c);
  	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh) c->y = c->mon->my + c->mon->mh - HEIGHT(c);
  	c->x = MAX(c->x, c->mon->mx);
  	/* only fix client y-offset, if the client center might cover the bar */
  
  	int rhs = ((c->mon->by == c->mon->my)
  				  && (c->x + (c->w / 2) >= c->mon->wx)
  				  && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww))
  				  ? bh
  				  : c->mon->my;
  
  	c->y  = MAX(c->y, rhs);
  	c->bw = borderpx;
  
  	wc.border_width = c->bw;
  	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
  	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
  	configure(c); /* propagates border_width, if size doesn't change */
  	updatewindowtype(c);
  	updatesizehints(c);
  	updatewmhints(c);
  	XSelectInput(dpy, w, EnterWindowMask | FocusChangeMask | PropertyChangeMask | StructureNotifyMask);
  	grabbuttons(c, 0);
  	if (!c->isfloating) c->isfloating = c->oldstate = trans != None || c->isfixed;
  	if (c->isfloating) XRaiseWindow(dpy, c->win);
  	attach(c);
  	attachstack(c);
  	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
  		(unsigned char *) &(c->win), 1);
  	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
  	setclientstate(c, NormalState);
  	if (c->mon == selmon) unfocus(selmon->sel, 0);
  	c->mon->sel = c;
  	arrange(c->mon);
  	XMapWindow(dpy, c->win);
  	focus(NULL);
  }
  
  void mappingnotify(XEvent *e) {
  	XMappingEvent *ev = &e->xmapping;
  
  	XRefreshKeyboardMapping(ev);
  	if (ev->request == MappingKeyboard) grabkeys();
  }
  
  void maprequest(XEvent *e) {
  	static XWindowAttributes wa;
  	XMapRequestEvent		 *ev = &e->xmaprequest;
  
  	if (!XGetWindowAttributes(dpy, ev->window, &wa) || wa.override_redirect) return;
  	if (!wintoclient(ev->window)) manage(ev->window, &wa);
  }
  
  void monocle(Monitor *m) {
  	unsigned n = 0;
  	Client  *c;
  
  	for (c = m->clients; c; c = c->next)
  		if (ISVISIBLE(c)) n++;
  
  	/* override layout symbol */
  	if (n > 0) snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
  	for (c = nexttiled(m->clients); c; c = nexttiled(c->next)) resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
  }
  
  void motionnotify(XEvent *e) {
  	static Monitor *mon = NULL;
  	Monitor		*m;
  	XMotionEvent	 *ev = &e->xmotion;
  
  	if (ev->window != root) return;
  	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
  		unfocus(selmon->sel, 1);
  		selmon = m;
  		focus(NULL);
  	}
  	mon = m;
  }
  
  void movemouse(const Arg *arg) {
  	int		 x, y, ocx, ocy, nx, ny;
  	Client  *c;
  	Monitor *m;
  	XEvent	 ev;
  	Time	 lasttime = 0;
  
  	if (!(c = selmon->sel)) return;
  	if (c->isfullscreen) return; /* no support moving fullscreen windows by mouse */
  	restack(selmon);
  	ocx = c->x;
  	ocy = c->y;
  	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
  			None, cursor[CurMove]->cursor, CurrentTime)
  		!= GrabSuccess) return;
  	if (!getrootptr(&x, &y)) return;
  	do {
  		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
  		switch (ev.type) {
  			case ConfigureRequest:
  			case Expose:
  			case MapRequest:
  				handler[ev.type](&ev);
  				break;
  			case MotionNotify:
  				if ((ev.xmotion.time - lasttime) <= (1000 / 60)) continue;
  				lasttime = ev.xmotion.time;
  
  				nx = ocx + (ev.xmotion.x - x);
  				ny = ocy + (ev.xmotion.y - y);
  				if (abs(selmon->wx - nx) < snap) nx = selmon->wx;
  				else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap) nx = selmon->wx + selmon->ww - WIDTH(c);
  				if (abs(selmon->wy - ny) < snap) ny = selmon->wy;
  				else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap) ny = selmon->wy + selmon->wh - HEIGHT(c);
  				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
  					togglefloating(NULL);
  				if (!selmon->lt[selmon->sellt]->arrange || c->isfloating) resize(c, nx, ny, c->w, c->h, 1);
  				break;
  		}
  	} while (ev.type != ButtonRelease);
  
  	XUngrabPointer(dpy, CurrentTime);
  	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
  		sendmon(c, m);
  		selmon = m;
  		focus(NULL);
  	}
  }
  
  Client *nexttiled(Client *c) {
  	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next) {}
  	return c;
  }
  
  void pop(Client *c) {
  	detach(c);
  	attach(c);
  	focus(c);
  	arrange(c->mon);
  }
  
  void propertynotify(XEvent *e) {
  	Client		   *c;
  	Window			trans;
  	XPropertyEvent *ev = &e->xproperty;
  
  	if ((ev->window == root) && (ev->atom == XA_WM_NAME)) updatestatus();
  	else if (ev->state == PropertyDelete) return; /* ignore */
  	else if ((c = wintoclient(ev->window))) {
  		switch (ev->atom) {
  			default: break;
  			case XA_WM_TRANSIENT_FOR:
  				if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) && (c->isfloating = (wintoclient(trans)) != NULL))
  					arrange(c->mon);
  				break;
  			case XA_WM_NORMAL_HINTS:
  				updatesizehints(c);
  				break;
  			case XA_WM_HINTS:
  				updatewmhints(c);
  				drawbars();
  				break;
  		}
  
  		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
  			updatetitle(c);
  			if (c == c->mon->sel) drawbar(c->mon);
  		}
  
  		if (ev->atom == netatom[NetWMWindowType]) updatewindowtype(c);
  	}
  }
  
  void quit(const Arg *arg) {
  	running = 0;
  }
  
  Monitor *recttomon(int x, int y, int w, int h) {
  	Monitor *m, *r	 = selmon;
  	int		 a, area = 0;
  
  	for (m = mons; m; m = m->next)
  		if ((a = INTERSECT(x, y, w, h, m)) > area) {
  			area = a;
  			r	 = m;
  		}
  	return r;
  }
  
  void resize(Client *c, int x, int y, int w, int h, int interact) {
  	if (applysizehints(c, &x, &y, &w, &h, interact)) resizeclient(c, x, y, w, h);
  }
  
  void resizeclient(Client *c, int x, int y, int w, int h) {
  	XWindowChanges wc;
  
  	c->oldx = c->x;
  	c->x = wc.x = x;
  	c->oldy		= c->y;
  	c->y = wc.y = y;
  	c->oldw		= c->w;
  	c->w = wc.width = w;
  	c->oldh			= c->h;
  	c->h = wc.height = h;
  	wc.border_width	 = c->bw;
  
  	XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
  	configure(c);
  	XSync(dpy, False);
  }
  
  void resizemouse(const Arg *arg) {
  	int		 ocx, ocy, nw, nh;
  	Client  *c;
  	Monitor *m;
  	XEvent	 ev;
  	Time	 lasttime = 0;
  
  	if (!(c = selmon->sel)) return;
  	if (c->isfullscreen) return; /* no support resizing fullscreen windows by mouse */
  	restack(selmon);
  	ocx = c->x;
  	ocy = c->y;
  	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
  			None, cursor[CurResize]->cursor, CurrentTime)
  		!= GrabSuccess) return;
  	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
  	do {
  		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
  		switch (ev.type) {
  			case ConfigureRequest:
  			case Expose:
  			case MapRequest:
  				handler[ev.type](&ev);
  				break;
  			case MotionNotify:
  				if ((ev.xmotion.time - lasttime) <= (1000 / 60)) continue;
  				lasttime = ev.xmotion.time;
  
  				nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
  				nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
  				if (c->mon->wx + nw >= selmon->wx
  					&& c->mon->wx + nw <= selmon->wx + selmon->ww
  					&& c->mon->wy + nh >= selmon->wy
  					&& c->mon->wy + nh <= selmon->wy + selmon->wh)
  					if (!c->isfloating
  						&& selmon->lt[selmon->sellt]->arrange
  						&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap)) togglefloating(NULL);
  
  				if (!selmon->lt[selmon->sellt]->arrange || c->isfloating) resize(c, c->x, c->y, nw, nh, 1);
  				break;
  		}
  	} while (ev.type != ButtonRelease);
  
  	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
  	XUngrabPointer(dpy, CurrentTime);
  	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev)) {}
  	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
  		sendmon(c, m);
  		selmon = m;
  		focus(NULL);
  	}
  }
  
  void restack(Monitor *m) {
  	Client		   *c;
  	XEvent		   ev;
  	XWindowChanges wc;
  
  	drawbar(m);
  	if (!m->sel) return;
  	if (m->sel->isfloating || !m->lt[m->sellt]->arrange) XRaiseWindow(dpy, m->sel->win);
  	if (m->lt[m->sellt]->arrange) {
  		wc.stack_mode = Below;
  		wc.sibling	  = m->barwin;
  		for (c = m->stack; c; c = c->snext)
  			if (!c->isfloating && ISVISIBLE(c)) {
  				XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
  				wc.sibling = c->win;
  			}
  	}
  	XSync(dpy, False);
  	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev)) {}
  }
  
  void run(void) {
  	XEvent ev;
  	/* main event loop */
  	XSync(dpy, False);
  
  	if (pthread_create(&thread_update_status_bar, NULL, thread_run_update_statusbar, NULL))
  		die("pthread:");
  
  	atexit(atexit_thread_cancel);
  
  	while (running && !XNextEvent(dpy, &ev))
  		if (handler[ev.type]) handler[ev.type](&ev); /* call handler */
  }
  
  void scan(void) {
  	unsigned		  i, num;
  	Window			  d1, d2, *wins = NULL;
  	XWindowAttributes wa;
  
  	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
  		for (i = 0; i < num; i++) {
  			if (!XGetWindowAttributes(dpy, wins[i], &wa) || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1)) continue;
  			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState) manage(wins[i], &wa);
  		}
  		for (i = 0; i < num; i++) { /* now the transients */
  			if (!XGetWindowAttributes(dpy, wins[i], &wa)) continue;
  			if (XGetTransientForHint(dpy, wins[i], &d1) && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
  				manage(wins[i], &wa);
  		}
  		if (wins) XFree(wins);
  	}
  }
  
  void sendmon(Client *c, Monitor *m) {
  	if (c->mon == m) return;
  	unfocus(c, 1);
  	detach(c);
  	detachstack(c);
  	c->mon	= m;
  	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
  	attach(c);
  	attachstack(c);
  	focus(NULL);
  	arrange(NULL);
  }
  
  void setborderpx(const Arg *arg) {
  	const int diff = arg->i;
  	if (borderpx + diff < 0) borderpx = 0;
  	else if (borderpx + diff > max_border_size) borderpx = max_border_size;
  	else borderpx += diff;
  }
  
  void setclientstate(Client *c, long state) {
  	long data[] = {state, None};
  
  	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
  		PropModeReplace, (unsigned char *) data, 2);
  }
  
  int sendevent(Client *c, Atom proto) {
  	int	   n;
  	Atom	 *protocols;
  	int	   exists = 0;
  	XEvent ev;
  
  	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
  		while (!exists && n--) exists = protocols[n] == proto;
  		XFree(protocols);
  	}
  	if (exists) {
  		ev.type					= ClientMessage;
  		ev.xclient.window		= c->win;
  		ev.xclient.message_type = wmatom[WMProtocols];
  		ev.xclient.format		= 32;
  		ev.xclient.data.l[0]	= proto;
  		ev.xclient.data.l[1]	= CurrentTime;
  		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
  	}
  	return exists;
  }
  
  void setfocus(Client *c) {
  	if (!c->neverfocus) {
  		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
  		XChangeProperty(dpy, root, netatom[NetActiveWindow], XA_WINDOW, 32, PropModeReplace, (unsigned char *) &(c->win), 1);
  	}
  	sendevent(c, wmatom[WMTakeFocus]);
  }
  
  void setfullscreen(Client *c, int fullscreen) {
  	if (fullscreen && !c->isfullscreen) {
  		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32, PropModeReplace, (unsigned char *) &netatom[NetWMFullscreen], 1);
  		c->isfullscreen = 1;
  		c->oldstate		= c->isfloating;
  		c->oldbw		= c->bw;
  		c->bw			= 0;
  		c->isfloating	= 1;
  		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
  		XRaiseWindow(dpy, c->win);
  	} else if (!fullscreen && c->isfullscreen) {
  		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32, PropModeReplace, (unsigned char *) 0, 0);
  		c->isfullscreen = 0;
  		c->isfloating	= c->oldstate;
  		c->bw			= c->oldbw;
  		c->x			= c->oldx;
  		c->y			= c->oldy;
  		c->w			= c->oldw;
  		c->h			= c->oldh;
  		resizeclient(c, c->x, c->y, c->w, c->h);
  		arrange(c->mon);
  	}
  }
  
  void setlayout(const Arg *arg) {
  	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt]) selmon->sellt ^= 1;
  	if (arg && arg->v) selmon->lt[selmon->sellt] = (Layout *) arg->v;
  	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
  	if (selmon->sel) arrange(selmon);
  	else drawbar(selmon);
  }
  
  /* arg > 1.0 will set mfact absolutely */
  void setmfact(const Arg *arg) {
  	if (!arg || !selmon->lt[selmon->sellt]->arrange) return;
  	float f = arg->f < 1.0f ? arg->f + selmon->mfact : arg->f - 1.0f;
  	if (f < 0.05f || f > 0.95f) return;
  	selmon->mfact = f;
  	arrange(selmon);
  }
  
  void setup(void) {
  	int					 i;
  	XSetWindowAttributes wa;
  	Atom				 utf8string;
  
  	/* clean up any zombies immediately */
  	sigchld(0);
  
  	/* init screen */
  	screen = DefaultScreen(dpy);
  	sw	   = DisplayWidth(dpy, screen);
  	sh	   = DisplayHeight(dpy, screen);
  	root   = RootWindow(dpy, screen);
  	drw	   = drw_create(dpy, screen, root, sw, sh);
  	if (!drw_fontset_create(drw, fonts, LENGTH(fonts))) die("no fonts could be loaded.");
  	lrpad = drw->fonts->h;
  	bh	  = drw->fonts->h + 2;
  	updategeom();
  
  	/* init atoms */
  	utf8string					   = XInternAtom(dpy, "UTF8_STRING", False);
  	wmatom[WMProtocols]			   = XInternAtom(dpy, "WM_PROTOCOLS", False);
  	wmatom[WMDelete]			   = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
  	wmatom[WMState]				   = XInternAtom(dpy, "WM_STATE", False);
  	wmatom[WMTakeFocus]			   = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
  	netatom[NetActiveWindow]	   = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
  	netatom[NetSupported]		   = XInternAtom(dpy, "_NET_SUPPORTED", False);
  	netatom[NetWMName]			   = XInternAtom(dpy, "_NET_WM_NAME", False);
  	netatom[NetWMState]			   = XInternAtom(dpy, "_NET_WM_STATE", False);
  	netatom[NetWMCheck]			   = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
  	netatom[NetWMFullscreen]	   = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
  	netatom[NetWMWindowType]	   = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
  	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
  	netatom[NetClientList]		   = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
  	netatom[NetWMWindowOpacity]	   = XInternAtom(dpy, "_NET_WM_WINDOW_OPACITY", False);
  	/* init cursors */
  	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
  	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
  	cursor[CurMove]	  = drw_cur_create(drw, XC_fleur);
  
  	/* init appearance */
  	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
  	for (i = 0; i < LENGTH(colors); i++) scheme[i] = drw_scm_create(drw, colors[i], 3);
  
  	/* init bars */
  	updatebars();
  	updatestatus();
  
  	/* supporting window for NetWMCheck */
  	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
  	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32, PropModeReplace, (unsigned char *) &wmcheckwin, 1);
  	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8, PropModeReplace, (unsigned char *) "dwm", 3);
  	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32, PropModeReplace, (unsigned char *) &wmcheckwin, 1);
  
  	/* EWMH support per view */
  	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32, PropModeReplace, (unsigned char *) netatom, NetLast);
  	XDeleteProperty(dpy, root, netatom[NetClientList]);
  
  	/* select events */
  	wa.cursor	  = cursor[CurNormal]->cursor;
  	wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
  					| ButtonPressMask | PointerMotionMask | EnterWindowMask
  					| LeaveWindowMask | StructureNotifyMask | PropertyChangeMask;
  	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
  	XSelectInput(dpy, root, wa.event_mask);
  	grabkeys();
  	focus(NULL);
  	set_wallpaper(NULL);
  
  	static const char *picom[]	 = {"picom", NULL};
  	static const Arg   picom_arg = {.v = picom};
  	spawn(&picom_arg);
  }
  
  void seturgent(Client *c, int urg) {
  	XWMHints *wmh;
  	c->isurgent = urg;
  	if (!(wmh = XGetWMHints(dpy, c->win))) return;
  	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
  	XSetWMHints(dpy, c->win, wmh);
  	XFree(wmh);
  }
  
  void showhide(Client *c) {
  	if (!c) return;
  	if (ISVISIBLE(c)) {
  		/* show clients top down */
  		XMoveWindow(dpy, c->win, c->x, c->y);
  		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen) resize(c, c->x, c->y, c->w, c->h, 0);
  		showhide(c->snext);
  	} else {
  		/* hide clients bottom up */
  		showhide(c->snext);
  		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
  	}
  }
  
  void sigchld(int unused) {
  	if (signal(SIGCHLD, sigchld) == SIG_ERR) die("can't install SIGCHLD handler:");
  	while (0 < waitpid(-1, NULL, WNOHANG)) {}
  }
  
  void spawn(const Arg *arg) {
  	if (arg->v == dmenucmd) dmenumon[0] = '0' + selmon->num;
  	if (fork() == 0) {
  		if (dpy) close(ConnectionNumber(dpy));
  		setsid();
  		execvp(((char **) arg->v)[0], (char **) arg->v);
  		fprintf(stderr, "dwm: execvp %s", ((char **) arg->v)[0]);
  		perror(" failed");
  		exit(EXIT_SUCCESS);
  	}
  }
  
  void tag(const Arg *arg) {
  	if (selmon->sel && arg->ui & TAGMASK) {
  		selmon->sel->tags = arg->ui & TAGMASK;
  		focus(NULL);
  		arrange(selmon);
  	}
  }
  
  void tagmon(const Arg *arg) {
  	if (!selmon->sel || !mons->next) return;
  	sendmon(selmon->sel, dirtomon(arg->i));
  }
  
  void tile(Monitor *m) {
  	unsigned i, n, h, mw, my, ty;
  	Client  *c;
  
  	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++) {}
  	if (n == 0) return;
  
  	if (n > m->nmaster) mw = m->nmaster ? m->ww * m->mfact : 0;
  	else mw = m->ww;
  	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
  		if (i < m->nmaster) {
  			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
  			resize(c, m->wx, m->wy + my, mw - (2 * c->bw), h - (2 * c->bw), 0);
  			if (my + HEIGHT(c) < m->wh) my += HEIGHT(c);
  		} else {
  			h = (m->wh - ty) / (n - i);
  			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2 * c->bw), h - (2 * c->bw), 0);
  			if (ty + HEIGHT(c) < m->wh) ty += HEIGHT(c);
  		}
  }
  
  void togglebar(const Arg *arg) {
  	selmon->showbar = !selmon->showbar;
  	updatebarpos(selmon);
  	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
  	arrange(selmon);
  }
  
  void togglefloating(const Arg *arg) {
  	if (!selmon->sel) return;
  	if (selmon->sel->isfullscreen) return; /* no support for fullscreen windows */
  	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
  	if (selmon->sel->isfloating) resize(selmon->sel, selmon->sel->x, selmon->sel->y, selmon->sel->w, selmon->sel->h, 0);
  	arrange(selmon);
  }
  
  void toggletag(const Arg *arg) {
  	unsigned newtags;
  
  	if (!selmon->sel) return;
  	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
  	if (newtags) {
  		selmon->sel->tags = newtags;
  		focus(NULL);
  		arrange(selmon);
  	}
  }
  
  void toggleview(const Arg *arg) {
  	unsigned newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
  
  	if (newtagset) {
  		selmon->tagset[selmon->seltags] = newtagset;
  		focus(NULL);
  		arrange(selmon);
  	}
  }
  
  void unfocus(Client *c, int setfocus) {
  	if (!c) return;
  	grabbuttons(c, 0);
  	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
  	if (setfocus) {
  		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
  		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
  	}
  }
  
  void unmanage(Client *c, int destroyed) {
  	Monitor		*m = c->mon;
  	XWindowChanges wc;
  
  	detach(c);
  	detachstack(c);
  	if (!destroyed) {
  		wc.border_width = c->oldbw;
  		XGrabServer(dpy); /* avoid race conditions */
  		XSetErrorHandler(xerrordummy);
  		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
  		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
  		setclientstate(c, WithdrawnState);
  		XSync(dpy, False);
  		XSetErrorHandler(xerror);
  		XUngrabServer(dpy);
  	}
  
  	free(c);
  	focus(NULL);
  	updateclientlist();
  	arrange(m);
  }
  
  void unmapnotify(XEvent *e) {
  	Client	   *c;
  	XUnmapEvent *ev = &e->xunmap;
  
  	if ((c = wintoclient(ev->window))) {
  		if (ev->send_event) setclientstate(c, WithdrawnState);
  		else unmanage(c, 0);
  	}
  }
  
  void updatebars(void) {
  	Monitor				*m;
  	XSetWindowAttributes wa = {
  		.override_redirect = True,
  		.background_pixmap = ParentRelative,
  		.event_mask		   = ButtonPressMask | ExposureMask};
  	XClassHint ch = {"dwm", "dwm"};
  	for (m = mons; m; m = m->next) {
  		if (m->barwin) continue;
  		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
  			CopyFromParent, DefaultVisual(dpy, screen),
  			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
  		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
  		XMapRaised(dpy, m->barwin);
  		XSetClassHint(dpy, m->barwin, &ch);
  	}
  }
  
  void updatebarpos(Monitor *m) {
  	m->wy = m->my;
  	m->wh = m->mh;
  	if (m->showbar) {
  		m->wh -= bh;
  		m->by = m->topbar ? m->wy : m->wy + m->wh;
  		m->wy = m->topbar ? m->wy + bh : m->wy;
  	} else m->by = -bh;
  }
  
  void updateclientlist() {
  	Client  *c;
  	Monitor *m;
  
  	XDeleteProperty(dpy, root, netatom[NetClientList]);
  	for (m = mons; m; m = m->next)
  		for (c = m->clients; c; c = c->next)
  			XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend, (unsigned char *) &(c->win), 1);
  }
  
  int updategeom(void) {
  	int dirty = 0;
  
  #ifdef XINERAMA
  	if (XineramaIsActive(dpy)) {
  		int					i, j, n, nn;
  		Client			   *c;
  		Monitor			*m;
  		XineramaScreenInfo *info   = XineramaQueryScreens(dpy, &nn);
  		XineramaScreenInfo *unique = NULL;
  
  		for (n = 0, m = mons; m; m = m->next, n++) {}
  
  		/* only consider unique geometries as separate screens */
  		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
  		for (i = 0, j = 0; i < nn; i++)
  			if (isuniquegeom(unique, j, &info[i])) memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
  		XFree(info);
  		nn = j;
  
  		if (n <= nn) { /* new monitors available */
  			for (i = 0; i < (nn - n); i++) {
  				for (m = mons; m && m->next; m = m->next) {}
  				if (m) m->next = createmon();
  				else mons = createmon();
  			}
  			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
  				if (i >= n
  					|| unique[i].x_org != m->mx || unique[i].y_org != m->my
  					|| unique[i].width != m->mw || unique[i].height != m->mh) {
  					dirty  = 1;
  					m->num = i;
  					m->mx = m->wx = unique[i].x_org;
  					m->my = m->wy = unique[i].y_org;
  					m->mw = m->ww = unique[i].width;
  					m->mh = m->wh = unique[i].height;
  					updatebarpos(m);
  				}
  		} else { /* less monitors available nn < n */
  			for (i = nn; i < n; i++) {
  				for (m = mons; m && m->next; m = m->next) {}
  				while ((c = m->clients)) {
  					dirty	   = 1;
  					m->clients = c->next;
  					detachstack(c);
  					c->mon = mons;
  					attach(c);
  					attachstack(c);
  				}
  				if (m == selmon) selmon = mons;
  				cleanupmon(m);
  			}
  		}
  		free(unique);
  	} else
  #endif /* XINERAMA */
  	{  /* default monitor setup */
  		if (!mons) mons = createmon();
  		if (mons->mw != sw || mons->mh != sh) {
  			dirty	 = 1;
  			mons->mw = mons->ww = sw;
  			mons->mh = mons->wh = sh;
  			updatebarpos(mons);
  		}
  	}
  	if (dirty) {
  		selmon = mons;
  		selmon = wintomon(root);
  	}
  	return dirty;
  }
  
  void updatenumlockmask(void) {
  	unsigned		 i, j;
  	XModifierKeymap *modmap;
  
  	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);
  }
  
  void updatesizehints(Client *c) {
  	long	   msize;
  	XSizeHints size;
  
  	/* size is uninitialized, ensure that size.flags aren't used */
  	if (!XGetWMNormalHints(dpy, c->win, &size, &msize)) size.flags = PSize;
  
  	if (size.flags & PBaseSize) {
  		c->basew = size.base_width;
  		c->baseh = size.base_height;
  	} else if (size.flags & PMinSize) {
  		c->basew = size.min_width;
  		c->baseh = size.min_height;
  	} else c->basew = c->baseh = 0;
  
  	if (size.flags & PResizeInc) {
  		c->incw = size.width_inc;
  		c->inch = size.height_inc;
  	} else c->incw = c->inch = 0;
  
  	if (size.flags & PMaxSize) {
  		c->maxw = size.max_width;
  		c->maxh = size.max_height;
  	} else c->maxw = c->maxh = 0;
  
  	if (size.flags & PMinSize) {
  		c->minw = size.min_width;
  		c->minh = size.min_height;
  	} else if (size.flags & PBaseSize) {
  		c->minw = size.base_width;
  		c->minh = size.base_height;
  	} else c->minw = c->minh = 0;
  
  	if (size.flags & PAspect) {
  		c->mina = (float) size.min_aspect.y / size.min_aspect.x;
  		c->maxa = (float) size.max_aspect.x / size.max_aspect.y;
  	} else c->maxa = c->mina = 0.0f;
  
  	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
  }
  
  void updatestatus(void) {
  	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext))) strcpy(stext, "dwm-" VERSION);
  	drawbar(selmon);
  }
  
  void updatetitle(Client *c) {
  	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name)) gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
  	if (c->name[0] == '\0') strcpy(c->name, broken); /* hack to mark broken clients */
  }
  
  void updatewindowtype(Client *c) {
  	Atom state = getatomprop(c, netatom[NetWMState]);
  	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
  
  	if (state == netatom[NetWMFullscreen]) setfullscreen(c, 1);
  	if (wtype == netatom[NetWMWindowTypeDialog]) c->isfloating = 1;
  }
  
  void updatewmhints(Client *c) {
  	XWMHints *wmh;
  
  	if ((wmh = XGetWMHints(dpy, c->win))) {
  		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
  			wmh->flags &= ~XUrgencyHint;
  			XSetWMHints(dpy, c->win, wmh);
  		} else c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
  
  		if (wmh->flags & InputHint) c->neverfocus = !wmh->input;
  		else c->neverfocus = 0;
  		XFree(wmh);
  	}
  }
  
  void view(const Arg *arg) {
  	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags]) return;
  	selmon->seltags ^= 1; /* toggle sel tagset */
  	if (arg->ui & TAGMASK) selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
  	focus(NULL);
  	arrange(selmon);
  }
  
  Client *wintoclient(Window w) {
  	Client  *c;
  	Monitor *m;
  
  	for (m = mons; m; m = m->next)
  		for (c = m->clients; c; c = c->next)
  			if (c->win == w) return c;
  	return NULL;
  }
  
  Monitor *wintomon(Window w) {
  	int		 x, y;
  	Client  *c;
  	Monitor *m;
  
  	if (w == root && getrootptr(&x, &y)) return recttomon(x, y, 1, 1);
  	for (m = mons; m; m = m->next)
  		if (w == m->barwin) return m;
  	if ((c = wintoclient(w))) return c->mon;
  	return selmon;
  }
  
  /* 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_GrabButton && ee->error_code == BadAccess)
  		|| (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 xerrordummy(Display *dpy, XErrorEvent *ee) {
  	return 0;
  }
  
  /* Startup Error handler to check if another window manager
   * is already running. */
  int xerrorstart(Display *dpy, XErrorEvent *ee) {
  	die("dwm: another window manager is already running");
  	return -1;
  }
  
  void zoom(const Arg *arg) {
  	Client *c = selmon->sel;
  
  	if (!selmon->lt[selmon->sellt]->arrange || (selmon->sel && selmon->sel->isfloating)) return;
  	if (c == nexttiled(selmon->clients))
  		if (!c || !(c = nexttiled(c->next))) return;
  	pop(c);
  }
  
  int main(int argc, char *argv[]) {
  	if (argc == 2 && !strcmp("-v", argv[1])) die("dwm-" VERSION);
  	else if (argc != 1) die("usage: dwm [-v]");
  	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale()) fputs("warning: no locale support\n", stderr);
  	if (!(dpy = XOpenDisplay(NULL))) die("dwm: cannot open display");
  	checkotherwm();
  	setup();
  #ifdef __OpenBSD__
  	if (pledge("stdio rpath proc exec", NULL) == -1) die("pledge");
  #endif /* __OpenBSD__ */
  	scan();
  	run();
  	cleanup();
  	XCloseDisplay(dpy);
  	return EXIT_SUCCESS;
  }
  
  /// ===================== EXTENSIONS =========================
  void atexit_thread_cancel(void) {
  	pthread_cancel(thread_update_status_bar);
  }
  
  static long get_num_between(char *str, char from, char to) {
  	char *end = strchr(str, to) - 1;
  	return strtol(strchr(str, from) + 1, &end, 10);
  }
  
  static void kib_to_str(char *buffer, size_t kib, char digits) {
  	static char fmt[6] = {'%', '.', '1', 'f', 'M', 0};
  	if (kib < 1000) {
  		sprintf(buffer, "%liK", kib);
  		return;
  	}
  	fmt[2]	   = CLAMP(digits, '0', '9');
  	double val = kib;
  
  	if (kib < 1000000) {
  		fmt[4] = 'M';
  		val /= 1024.0;
  	} else if (kib < 1000000000) {
  		fmt[4] = 'G';
  		val /= 1048576.0;
  	} else if (kib < 1000000000000) {
  		fmt[4] = 'T';
  		val /= 1073741824.0;
  	} else {
  		sprintf(buffer, "∞");
  		return;
  	}
  
  	sprintf(buffer, fmt, val);
  }
  
  static void do_update_statusbar(const Arg *ignored) {
  	char   statusbar[1024] = {0};
  	size_t len			   = 0;
  
  	{
  		/// CPU load
  		float load	  = 0;
  		FILE *loadavg = fopen("/proc/loadavg", "r");
  		fscanf(loadavg, "%f", &load);
  		fclose(loadavg);
  		len += snprintf(statusbar + len, 1024 - len, " CPU %i%%", (int) load);
  	}
  
  	{
  		// Memory
  		FILE *meminfo		 = fopen("/proc/meminfo", "r");
  		char  mem_total[128] = {0}, mem_free[128] = {0};
  		fgets(mem_total, 128, meminfo);
  		fgets(mem_free, 128, meminfo); // Discard second line
  		fgets(mem_free, 128, meminfo);
  		fclose(meminfo);
  
  		long mem_total_n = get_num_between(mem_total, ':', 'k');
  		long mem_used_n	 = mem_total_n - get_num_between(mem_free, ':', 'k');
  
  		kib_to_str(mem_total, mem_total_n, '1');
  		kib_to_str(mem_free, mem_used_n, '1');
  
  		len += snprintf(statusbar + len, 1024 - len, " | MEM %s/%s", mem_free, mem_total);
  	}
  
  	{
  		/// Disk usage
  		struct statvfs st;
  		statvfs("/", &st);
  		char   storage[20] = {0}, total[20] = {0};
  		size_t used = (st.f_blocks - st.f_bfree) * st.f_frsize;
  		kib_to_str(storage, used / 1024, '0');
  		kib_to_str(total, st.f_blocks * st.f_frsize / 1024, '0');
  		len += snprintf(statusbar + len, 1024 - len, " | DU %s/%s", storage, total);
  	}
  
  	{
  		// Battery Capacity
  		char  capacity[10] = {0};
  		FILE *battery_info = fopen("/sys/class/power_supply/BAT0/capacity", "r");
  		fgets(capacity, 10, battery_info);
  		fclose(battery_info);
  		len += snprintf(statusbar + len, 1024 - len, " | BAT %i%%", atoi(capacity));
  	}
  
  	{
  		// Date
  		time_t	   t  = time(NULL);
  		struct tm *tm = localtime(&t);
  		len += strftime(statusbar + len, 1024 - len, " | %a, %e %b %R:%S ", tm);
  	}
  
  	XStoreName(dpy, root, statusbar);
  	XFlush(dpy);
  }
  
  void *thread_run_update_statusbar(void *unused) {
  	for (;;) {
  		do_update_statusbar(NULL);
  		sleep(1);
  	}
  }
  
  void lock_screen(const Arg *unused) {
  	if (!fork()) {
  		pid_t pid = fork();
  
  		if (!pid) {
  			setsid();
  			system("killall picom");
  			execlp("xsecurelock", "xsecurelock", NULL);
  		}
  
  		wait(NULL);
  		execlp("picom", "picom", NULL);
  	}
  }
  
  void set_wallpaper(const Arg *unused) {
  	FILE* f = fopen("/home/ae/.wallpaper", "r");
  	if(!f) return;
  	char buf[1024] = {0}, *ptr;
  	fgets(buf, 1024, f);
  	fclose(f);
  	
  	if(ptr = strchr(buf, '\n'), ptr) *ptr = 0;
  	
  	FILE* wallpaper = fopen(buf, "r");
  	if(!wallpaper) return;
  	fclose(wallpaper);
  
  	char	 *wallpaper_command[] = {"feh", "--bg-scale", buf, NULL};
  	const Arg a					  = {.v = wallpaper_command};
  	spawn(&a);
  }