dwm.c

/* 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 <errno.h>
#include <locale.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.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>
#ifdef XINERAMA
#include <X11/extensions/Xinerama.h>
#endif /* XINERAMA */
#include <X11/Xft/Xft.h>

#include "drw.h"
#include "util.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, M)         ((C->tags & M->tagset[M->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 TAGSLENGTH              (LENGTH(tags))
#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
#define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
#define MWM_HINTS_FLAGS_FIELD       0
#define MWM_HINTS_DECORATIONS_FIELD 2
#define MWM_HINTS_DECORATIONS       (1 << 1)
#define MWM_DECOR_ALL               (1 << 0)
#define MWM_DECOR_BORDER            (1 << 1)
#define MWM_DECOR_TITLE             (1 << 3)

#define OPAQUE                  0xffU

/* enums */
enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
enum { SchemeCol1, SchemeCol2, SchemeCol3, SchemeCol4, SchemeCol5, SchemeCol6, SchemeCol7, SchemeNorm, SchemeNormUrg, SchemeSel, SchemeSelUrg, SchemeSelOtherMon }; /* color schemes */
enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
	NetWMFullscreen, NetActiveWindow, NetWMWindowType,
	NetWMWindowTypeDialog, NetClientList, NetDesktopNames, NetDesktopViewport, NetNumberOfDesktops, NetCurrentDesktop, 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 int ui;
	float f;
	const void *v;
} Arg;

typedef struct {
	unsigned int click;
	unsigned int mask;
	unsigned int button;
	void (*func)(const Arg *arg);
	const Arg arg;
} Button;

typedef struct Clientlist Clientlist;
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 int tags;
	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
	Client *next;
	Client *snext;
	Monitor *mon;
	Window win;
};

typedef struct {
	unsigned int mod;
	KeySym keysym;
	void (*func)(const Arg *);
	const Arg arg;
} Key;

typedef struct {
	const char *symbol;
	void (*arrange)(Monitor *);
} Layout;

typedef struct Pertag Pertag;
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  */
	int gappx;            /* gaps between windows */
	unsigned int seltags;
	unsigned int sellt;
	unsigned int tagset[2];
	int showbar;
	int topbar;
	Clientlist *cl;
	Client *sel;
	Monitor *next;
	Window barwin;
	const Layout *lt[2];
	Pertag *pertag;
};

typedef struct {
	const char *class;
	const char *instance;
	const char *title;
	unsigned int tags;
	int isfloating;
	int monitor;
} Rule;

struct Clientlist {
	Client *clients;
	Client *stack;
};

/* 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 attachclients(Monitor *m);
static void attachstack(Client *c);
static void buttonpress(XEvent *e);
static void bstack(Monitor *m);
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 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 void movestack(const Arg *arg);
static Client *nexttiled(Client *c, Monitor *m);
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 setclientstate(Client *c, long state);
static void setcurrentdesktop(void);
static void setdesktopnames(void);
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 setnumdesktops(void);
static void setup(void);
static void setviewport(void);
static void seturgent(Client *c, int urg);
static void showhide(Client *c);
static void sigchld(int unused);
static void sighup(int unused);
static void sigterm(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 togglefullscr(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 updatecurrentdesktop(void);
static void updatebarpos(Monitor *m);
static void updatebars(void);
static void updateclientlist(void);
static int updategeom(void);
static void updatemotifhints(Client *c);
static void updatenumlockmask(void);
static void updatesizehints(Client *c);
static void updatestatus(void);
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 xinitvisual();
static void zoom(const Arg *arg);
static void autostart_exec(void);

/* 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 int 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], motifatom;
static int restart = 0;
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;
static int useargb = 0;
static Visual *visual;
static int depth;
static Colormap cmap;
static Clientlist *cl;

/* configuration, allows nested code to access above variables */
#include "config.h"

struct Pertag {
	unsigned int curtag, prevtag; /* current and previous tag */
	int nmasters[LENGTH(tags) + 1]; /* number of windows in master area */
	float mfacts[LENGTH(tags) + 1]; /* mfacts per tag */
	unsigned int sellts[LENGTH(tags) + 1]; /* selected layouts */
	const Layout *ltidxs[LENGTH(tags) + 1][2]; /* matrix of tags and layouts indexes  */
	int showbars[LENGTH(tags) + 1]; /* display bar for the current tag */
};

/* compile-time check if all tags fit into an unsigned int bit array. */
struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };

/* dwm will keep pid's of processes from autostart array and kill them at quit */
static pid_t *autostart_pids;
static size_t autostart_len;

/* execute command from autostart array */
static void
autostart_exec() {
	const char *const *p;
	size_t i = 0;

	/* count entries */
	for (p = autostart; *p; autostart_len++, p++)
		while (*++p);

	autostart_pids = malloc(autostart_len * sizeof(pid_t));
	for (p = autostart; *p; i++, p++) {
		if ((autostart_pids[i] = fork()) == 0) {
			setsid();
			execvp(*p, (char *const *)p);
			fprintf(stderr, "dwm: execvp %s\n", *p);
			perror(" failed");
			_exit(EXIT_FAILURE);
		}
		/* skip arguments */
		while (*++p);
	}
}

/* function implementations */
void
applyrules(Client *c)
{
	const char *class, *instance;
	unsigned int i;
	const Rule *r;
	Monitor *m;
	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 (i = 0; i < LENGTH(rules); i++) {
		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;
			for (m = mons; m && (m->tagset[m->seltags] & c->tags) == 0; 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)
{
	int baseismin;
	Monitor *m = c->mon;

	/* 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 {
		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;
	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
		/* see last two sentences in ICCCM 4.1.2.3 */
		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->cl->stack);
	else for (m = mons; m; m = m->next)
		showhide(m->cl->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)
{
	Client **tc;
	c->next = NULL;
	for (tc = &c->mon->cl->clients; *tc; tc = &(*tc)->next);
	*tc = c;
}

void
attachclients(Monitor *m) {
	/* attach clients to the specified monitor */
	Monitor *tm;
	Client *c;
	unsigned int utags = 0;
	Bool rmons = False;
	if(!m)
	return;

	/* collect information about the tags in use */
	for (tm = mons; tm; tm = tm->next)
	if(tm != m)
	utags |= tm->tagset[tm->seltags];

	for (c = m->cl->clients; c; c = c->next)
	if(ISVISIBLE(c, m)) {
		/* if client is also visible on other tags that are displayed on
		* other monitors, remove these tags */
		if(c->tags & utags) {
			c->tags = c->tags & m->tagset[m->seltags];
			rmons = True;
		}
		unfocus(c, True);
		c->mon = m;
	}

	if (rmons)
	for (tm = mons; tm; tm = tm->next)
	if(tm != m)
	arrange(tm);

}

void
attachstack(Client *c)
{
	c->snext = c->mon->cl->stack;
	c->mon->cl->stack = c;
}

void
buttonpress(XEvent *e)
{
	unsigned int i, x, click, occ = 0;
	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;
		for (c = m->cl->clients; c; c = c->next)
			occ |= c->tags == 255 ? 0 : c->tags;
		do {
			/* do not reserve space for vacant tags */
			if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
				continue;
			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 - TEXTW(stext))
			click = ClkStatusText;
		else
			click = ClkWinTitle;
	} else if ((c = wintoclient(ev->window))) {
		focus(c);
		restack(selmon);
		XAllowEvents(dpy, ReplayPointer, CurrentTime);
		click = ClkClientWin;
	} else
		click = ClkRootWin;
	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
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->cl->stack)
	unmanage(m->cl->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->cl->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, m))
			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, *tm;
	unsigned int i;

	/* bail out if the number of monitors exceeds the number of tags */
	for (i=1, tm=mons; tm; i++, tm=tm->next);
	if (i > LENGTH(tags)) {
		fprintf(stderr, "dwm: failed to add monitor, number of tags exceeded\n");
		return NULL;
	}
	/* find the first tag that isn't in use */
	for (i=0; i < LENGTH(tags); i++) {
		for (tm=mons; tm && !(tm->tagset[tm->seltags] & (1<<i)); tm=tm->next);
		if (!tm)
		break;
	}
	/* reassign all tags to monitors since there's currently no free tag for the
	* new monitor */
	if (i >= LENGTH(tags))
	for (i=0, tm=mons; tm; tm=tm->next, i++) {
		tm->seltags ^= 1;
		tm->tagset[tm->seltags] = (1<<i) & TAGMASK;
	}
	m = ecalloc(1, sizeof(Monitor));
	m->cl = cl;
	m->tagset[0] = m->tagset[1] = (1<<i) & TAGMASK;
	m->mfact = mfact;
	m->nmaster = nmaster;
	m->showbar = showbar;
	m->topbar = topbar;
	m->gappx = gappx;
	m->lt[0] = &layouts[0];
	m->lt[1] = &layouts[1 % LENGTH(layouts)];
	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
	m->pertag = ecalloc(1, sizeof(Pertag));
	m->pertag->curtag = m->pertag->prevtag = 1;

	for (i = 0; i <= LENGTH(tags); i++) {
		m->pertag->nmasters[i] = m->nmaster;
		m->pertag->mfacts[i] = m->mfact;

		m->pertag->ltidxs[i][0] = m->lt[0];
		m->pertag->ltidxs[i][1] = m->lt[1];
		m->pertag->sellts[i] = m->sellt;

		m->pertag->showbars[i] = m->showbar;
	}

	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->cl->clients; *tc && *tc != c; tc = &(*tc)->next);
	*tc = c->next;
}

void
detachstack(Client *c)
{
	Client **tc, *t;

	for (tc = &c->mon->cl->stack; *tc && *tc != c; tc = &(*tc)->snext);
	*tc = c->snext;

	if (c == c->mon->sel) {
		for (t = c->mon->cl->stack; t && !ISVISIBLE(t, c->mon); 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, mw, ew = 0, tx = 0;
	int boxs = drw->fonts->h / 9;
	int boxw = drw->fonts->h / 6 + 2;
	unsigned int i, occ = 0, urg = 0, n = 0;
	char *ts = stext, *tp = stext, ctmp;
	Client *c;

	/* correction for colours */
 	int correct = 0; 
	char *xcape = malloc (sizeof (char) * 128);
	memset(xcape,0,sizeof (char) * 128);
	for ( ; *ts != '\0' ; ts++) {    
		if (*ts <= LENGTH(colors)) {
			sprintf(xcape,"%c",*ts);
			correct += TEXTW(xcape) - lrpad;
		}
	}
	free(xcape);
	ts = stext;

	/* draw status first so it can be overdrawn by tags later */
	drw_setscheme(drw, scheme[SchemeNorm]);
	tw = TEXTW(stext) - lrpad + 2 - correct; /* 2px right padding */
	while (1) {
		if ((unsigned int) *ts > LENGTH(colors)) { ts++; continue; }
		ctmp = *ts;
		*ts = '\0';
		drw_text(drw, m->ww - tw + tx, 0, tw - tx, bh, 0, tp);
		tx += TEXTW(tp) - lrpad;
		if (ctmp == '\0') { break; }
		drw_setscheme(drw, scheme[(unsigned int) (ctmp-1)]);
		*ts = ctmp;
		tp = ++ts;
	}

	for (c = m->cl->clients; c; c = c->next) {
		if (ISVISIBLE(c, m))
			n++;
		occ |= c->tags == 255 ? 0 : c->tags;
		if (c->isurgent)
			urg |= c->tags;
	}
	x = 0;
	for (i = 0; i < LENGTH(tags); i++) {
		// Do not draw vacant tags
		if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
			continue;
		w = TEXTW(tags[i]);
		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? (urg & 1 << i ? SchemeSelUrg : SchemeSel) : (urg & 1 << i ? SchemeNormUrg : SchemeNorm)]);
		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[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);

	if ((w = m->ww - tw - x) > bh) {
		if (n > 0) {
			tw = TEXTW(m->sel->name) + lrpad;
			mw = (tw >= w || n == 1) ? 0 : (w - tw) / (n - 1);

			i = 0;
			for (c = m->cl->clients; c; c = c->next) {
				if (!ISVISIBLE(c, m) || c == m->sel)
					continue;
				tw = TEXTW(c->name);
				if(tw < mw)
					ew += (mw - tw);
				else
					i++;
			}
			if (i > 0)
				mw += ew / i;

			for (c = m->cl->clients; c; c = c->next) {
				if (!ISVISIBLE(c, m))
					continue;
				tw = MIN(m->sel == c ? w : mw, TEXTW(c->name));

				drw_setscheme(drw, scheme[m->sel == c ? SchemeSel : SchemeNorm]);
				if (tw > 0) /* trap special handling of 0 in drw_text */
					drw_text(drw, x, 0, tw, bh, lrpad / 2, c->name);
				if (c->isfloating)
					drw_rect(drw, x + boxs, boxs, boxw, boxw, c->isfixed, 0);
				x += tw;
				w -= tw;
			}
		}
		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
focus(Client *c)
{
	if (!c || !ISVISIBLE(c, selmon))
		for (c = selmon->cl->stack; c && !ISVISIBLE(c, selmon); 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);
	if (selmon->sel)
	XWarpPointer(dpy, None, selmon->sel->win, 0, 0, 0, 0, selmon->sel->w/2, selmon->sel->h/2);
}

void
focusstack(const Arg *arg)
{
	Client *c = NULL, *i;

	if (!selmon->sel || selmon->sel->isfullscreen)
	return;
	if (arg->i > 0) {
		for (c = selmon->sel->next; c && !ISVISIBLE(c, selmon); c = c->next);
		if (!c)
		for (c = selmon->cl->clients; c && !ISVISIBLE(c, selmon); c = c->next);
	} else {
		for (i = selmon->cl->clients; i != selmon->sel; i = i->next)
		if (ISVISIBLE(i, selmon))
		c = i;
		if (!c)
		for (; i; i = i->next)
		if (ISVISIBLE(i, selmon))
		c = i;
	}
	if (c) {
		focus(c);
		restack(selmon);
		XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w/2, c->h/2);
	}
}

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 int 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 int 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 int i, j;
		unsigned int 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 int i, j;
		unsigned int 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 = selmon->pertag->nmasters[selmon->pertag->curtag] = 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 int 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);
	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 */
	c->y = MAX(c->y, ((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->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);
	updatemotifhints(c);
	c->x = c->mon->mx + (c->mon->mw - WIDTH(c)) / 2;
	c->y = c->mon->my + (c->mon->mh - HEIGHT(c)) / 2;
	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))
	return;
	if (wa.override_redirect)
	return;
	if (!wintoclient(ev->window))
	manage(ev->window, &wa);
}

void
monocle(Monitor *m)
{
	unsigned int n = 0;
	Client *c;

	for (c = m->cl->clients; c; c = c->next)
		if (ISVISIBLE(c, m))
			n++;
	if (n > 0) /* override layout symbol */
		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
	for (c = nexttiled(m->cl->clients, m); c; c = nexttiled(c->next, m))
		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) /* no support moving fullscreen windows by mouse */
	return;
	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);
	}
}

void
movestack(const Arg *arg) {
	Client *c = NULL, *p = NULL, *pc = NULL, *i;

	if(arg->i > 0) {
		/* find the client after selmon->sel */
		for(c = selmon->sel->next; c && (!ISVISIBLE(c, selmon) || c->isfloating); c = c->next);
		if(!c)
			for(c = selmon->cl->clients; c && (!ISVISIBLE(c, selmon) || c->isfloating); c = c->next);

	}
	else {
		/* find the client before selmon->sel */
		for(i = selmon->cl->clients; i != selmon->sel; i = i->next)
			if(ISVISIBLE(i, selmon) && !i->isfloating)
				c = i;
		if(!c)
			for(; i; i = i->next)
				if(ISVISIBLE(i, selmon) && !i->isfloating)
					c = i;
	}
	/* find the client before selmon->sel and c */
	for(i = selmon->cl->clients; i && (!p || !pc); i = i->next) {
		if(i->next == selmon->sel)
			p = i;
		if(i->next == c)
			pc = i;
	}

	/* swap c and selmon->sel selmon->clients in the selmon->clients list */
	if(c && c != selmon->sel) {
		Client *temp = selmon->sel->next==c?selmon->sel:selmon->sel->next;
		selmon->sel->next = c->next==selmon->sel?c:c->next;
		c->next = temp;

		if(p && p != c)
			p->next = c;
		if(pc && pc != selmon->sel)
			pc->next = selmon->sel;

		if(selmon->sel == selmon->cl->clients)
			selmon->cl->clients = c;
		else if(c == selmon->cl->clients)
			selmon->cl->clients = selmon->sel;

		arrange(selmon);
	}
}

Client *
nexttiled(Client *c, Monitor *m)
{
	for (; c && (c->isfloating || !ISVISIBLE(c, m)); 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);
		if (ev->atom == motifatom)
		updatemotifhints(c);
	}
}

void
quit(const Arg *arg)
{

	size_t i;

	/* kill child processes */
	for (i = 0; i < autostart_len; i++) {
		if (0 < autostart_pids[i]) {
			kill(autostart_pids[i], SIGTERM);
			waitpid(autostart_pids[i], NULL, 0);
		}
	}

	if(arg->i) restart = 1;
	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;

	if (((nexttiled(c->mon->cl->clients, c->mon) == c && !nexttiled(c->next, c->mon))
	    || &monocle == c->mon->lt[c->mon->sellt]->arrange))
	{
		c->w = wc.width += c->bw * 2;
		c->h = wc.height += c->bw * 2;
		wc.border_width = 0;
	}

	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) /* no support resizing fullscreen windows by mouse */
	return;
	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->cl->stack; c; c = c->snext)
		if (!c->isfloating && ISVISIBLE(c, m)) {
			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);
	while (running && !XNextEvent(dpy, &ev))
	if (handler[ev.type])
	handler[ev.type](&ev); /* call handler */
}

void
scan(void)
{
	unsigned int 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);
	detachstack(c);
	c->mon = m;
	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
	attachstack(c);
	focus(NULL);
	arrange(NULL);
}

void
setclientstate(Client *c, long state)
{
	long data[] = { state, None };

	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
	PropModeReplace, (unsigned char *)data, 2);
}
void
setcurrentdesktop(void){
	long data[] = { 0 };
	XChangeProperty(dpy, root, netatom[NetCurrentDesktop], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 1);
}
void setdesktopnames(void){
	XTextProperty text;
	Xutf8TextListToTextProperty(dpy, tags, TAGSLENGTH, XUTF8StringStyle, &text);
	XSetTextProperty(dpy, root, &text, netatom[NetDesktopNames]);
}

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
setnumdesktops(void){
	long data[] = { TAGSLENGTH };
	XChangeProperty(dpy, root, netatom[NetNumberOfDesktops], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 1);
}

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 = selmon->pertag->sellts[selmon->pertag->curtag] ^= 1;
	if (arg && arg->v)
		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][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)
{
	float f;

	if (!arg || !selmon->lt[selmon->sellt]->arrange)
		return;
	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
	if (f < 0.05 || f > 0.95)
		return;
	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag] = f;
	arrange(selmon);
}

void
setup(void)
{
	int i;
	XSetWindowAttributes wa;
	Atom utf8string;

	/* clean up any zombies immediately */
	sigchld(0);

	signal(SIGHUP, sighup);
	signal(SIGTERM, sigterm);

	/* init screen */
	screen = DefaultScreen(dpy);
	sw = DisplayWidth(dpy, screen);
	sh = DisplayHeight(dpy, screen);
	if(!(cl = (Clientlist *)calloc(1, sizeof(Clientlist))))
	die("fatal: could not malloc() %u bytes\n", sizeof(Clientlist));
	root = RootWindow(dpy, screen);
	xinitvisual();
	drw = drw_create(dpy, screen, root, sw, sh, visual, depth, cmap);
	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[NetDesktopViewport] = XInternAtom(dpy, "_NET_DESKTOP_VIEWPORT", False);
	netatom[NetNumberOfDesktops] = XInternAtom(dpy, "_NET_NUMBER_OF_DESKTOPS", False);
	netatom[NetCurrentDesktop] = XInternAtom(dpy, "_NET_CURRENT_DESKTOP", False);
	netatom[NetDesktopNames] = XInternAtom(dpy, "_NET_DESKTOP_NAMES", False);
	motifatom = XInternAtom(dpy, "_MOTIF_WM_HINTS", 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], alphas[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);
	setnumdesktops();
	setcurrentdesktop();
	setdesktopnames();
	setviewport();
	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);
}
void
setviewport(void){
	long data[] = { 0, 0 };
	XChangeProperty(dpy, root, netatom[NetDesktopViewport], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 2);
}


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, c->mon)) {
		/* 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)
{
	pid_t pid;

	if (signal(SIGCHLD, sigchld) == SIG_ERR)
		die("can't install SIGCHLD handler:");
	while (0 < (pid = waitpid(-1, NULL, WNOHANG))) {
		pid_t *p, *lim;

		if (!(p = autostart_pids))
			continue;
		lim = &p[autostart_len];

		for (; p < lim; p++) {
			if (*p == pid) {
				*p = -1;
				break;
			}
		}

	}
}

void
sighup(int unused)
{
	Arg a = {.i = 1};
	quit(&a);
}

void
sigterm(int unused)
{
	Arg a = {.i = 0};
	quit(&a);
}

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)
{
	Monitor *m;
	unsigned int newtags;
	if (selmon->sel && arg->ui & TAGMASK) {
		newtags = arg->ui & TAGMASK;
		for (m = mons; m; m = m->next)
		/* if tag is visible on another monitor, move client to the new monitor */
			if (m != selmon && m->tagset[m->seltags] & newtags) {
				/* prevent moving client to all tags (MODKEY-Shift-0) when multiple monitors are connected */
				if(newtags & selmon->tagset[selmon->seltags])
					return;
				selmon->sel->tags = newtags;
				selmon->sel->mon = m;
				arrange(m);
				break;
			}
		/* workaround in case just one monitor is connected */

		selmon->sel->tags = arg->ui & TAGMASK;
		focus(NULL);
		arrange(selmon);
	}
	updatecurrentdesktop();
}

void
tagmon(const Arg *arg)
{
	if (!selmon->sel || !mons->next)
		return;
	sendmon(selmon->sel, dirtomon(arg->i));
}

void
tile(Monitor *m)
{
	unsigned int i, n, h, mw, my, ty, ns;
	Client *c;

	for (n = 0, c = nexttiled(m->cl->clients, m); c; c = nexttiled(c->next, m), n++);
	if (n == 0)
		return;
	
	if(n == 1){
		c = nexttiled(m->cl->clients, m);
		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
		return;
	}

	if (n > m->nmaster) {
		mw = m->nmaster ? m->ww * m->mfact : 0;
		ns = m->nmaster > 0 ? 2 : 1;
	}
	else{
		mw = m->ww - m->gappx;
		ns = 1;
	}
	for (i = 0, my = ty = m->gappx, c = nexttiled(m->cl->clients, m); c; c = nexttiled(c->next, m), i++)
	if (i < m->nmaster) {
		h = (m->wh - my) / (MIN(n, m->nmaster) - i) - m->gappx;
		resize(c, m->wx + m->gappx, m->wy + my, mw - 2*c->bw - m->gappx*(5-ns)/2, h - 2*c->bw, 0);
		if(my + HEIGHT(c) + m->gappx < m->wh)
			my += HEIGHT(c) + m->gappx;
	} else {
		h = (m->wh - ty) / (n - i) - m->gappx;
		resize(c, m->wx + mw + m->gappx/ns, m->wy + ty, m->ww - mw - (2*c->bw) - m->gappx*(5-ns)/2, h - 2*c->bw, 0);
		if(ty + HEIGHT(c) + m->gappx < m->wh)
		ty += HEIGHT(c) + m->gappx;
	}
}

void
togglebar(const Arg *arg)
{
	selmon->showbar = selmon->pertag->showbars[selmon->pertag->curtag] = !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) /* no support for fullscreen windows */
	return;
	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
togglefullscr(const Arg *arg)
{
	if(selmon->sel)
	setfullscreen(selmon->sel, !selmon->sel->isfullscreen);
}

void
toggletag(const Arg *arg)
{
	Monitor *m;
	unsigned int newtags;

	if (!selmon->sel)
	return;
	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
	if (newtags) {
		/* prevent adding tags that are in use on other monitors */
		for (m = mons; m; m = m->next)
		if (m != selmon && newtags & m->tagset[m->seltags])
		return;
		selmon->sel->tags = newtags;
		focus(NULL);
		arrange(selmon);
	}
	updatecurrentdesktop();
}

void
toggleview(const Arg *arg)
{
	Monitor *m;
	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
	int i;

	if (newtagset) {
		/* prevent displaying the same tags on multiple monitors */
		for(m = mons; m; m = m->next)
		if(m != selmon && newtagset & m->tagset[m->seltags])
			return;
		selmon->tagset[selmon->seltags] = newtagset;
		attachclients(selmon);
		arrange(selmon);
		focus(NULL);

		unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);

		if (newtagset) {
			selmon->tagset[selmon->seltags] = newtagset;


			if (newtagset == ~0) {
				selmon->pertag->prevtag = selmon->pertag->curtag;
				selmon->pertag->curtag = 0;
			}

			/* test if the user did not select the same tag */
			if (!(newtagset & 1 << (selmon->pertag->curtag - 1))) {
				selmon->pertag->prevtag = selmon->pertag->curtag;
			for (i = 0; !(newtagset & 1 << i); i++) ;
			selmon->pertag->curtag = i + 1;
		}

		/* apply settings for this view */
		selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
		selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
		selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
		selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];

		if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
			togglebar(NULL);


		attachclients(selmon);
		arrange(selmon);
		focus(NULL);
		}
	}
}

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_pixel = 0,
		.border_pixel = 0,
		.colormap = cmap,
		.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, depth,
		InputOutput, visual,
		CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|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->cl->clients; c; c = c->next)
	XChangeProperty(dpy, root, netatom[NetClientList],
	XA_WINDOW, 32, PropModeAppend,
	(unsigned char *) &(c->win), 1);
}
void updatecurrentdesktop(void){
	long rawdata[] = { selmon->tagset[selmon->seltags] };
	int i=0;
	while(*rawdata >> (i+1)){
		i++;
	}
	long data[] = { i };
	XChangeProperty(dpy, root, netatom[NetCurrentDesktop], XA_CARDINAL, 32, PropModeReplace, (unsigned char *)data, 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();
					attachclients(m->next);
				}
				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);
				if (m == selmon)
					selmon = mons;
				for (c = m->cl->clients; c; c = c->next) {
					dirty = True;
					if (c->mon == m)
					c->mon = selmon;
				}
				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
updatemotifhints(Client *c)
{
	Atom real;
	int format;
	unsigned char *p = NULL;
	unsigned long n, extra;
	unsigned long *motif;
	int width, height;

	if (!decorhints)
	return;

	if (XGetWindowProperty(dpy, c->win, motifatom, 0L, 5L, False, motifatom,
	&real, &format, &n, &extra, &p) == Success && p != NULL) {
		motif = (unsigned long*)p;
		if (motif[MWM_HINTS_FLAGS_FIELD] & MWM_HINTS_DECORATIONS) {
			width = WIDTH(c);
			height = HEIGHT(c);

			if (motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_ALL ||
			motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_BORDER ||
			motif[MWM_HINTS_DECORATIONS_FIELD] & MWM_DECOR_TITLE)
			c->bw = c->oldbw = borderpx;
			else
			c->bw = c->oldbw = 0;

			resize(c, c->x, c->y, width - (2*c->bw), height - (2*c->bw), 0);
		}
		XFree(p);
	}
}

void
updatenumlockmask(void)
{
	unsigned int 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;

	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
	/* size is uninitialized, ensure that size.flags aren't used */
	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 = 0.0;
	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
}

void
updatestatus(void)
{
	Monitor* m;


	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
		strcpy(stext, "dwm-"VERSION);
	for (m = mons; m; m = m->next)
		drawbar(m);
}

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') /* hack to mark broken clients */
	strcpy(c->name, broken);
}

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)
{
	Monitor *m;
	unsigned int newtagset = selmon->tagset[selmon->seltags ^ 1], tmptag;
	int i;

	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
		return;
	/* swap tags when trying to display a tag from another monitor */
	if (arg->ui & TAGMASK)
		newtagset = arg->ui & TAGMASK;
	for (m = mons; m; m = m->next)
		if (m != selmon && newtagset & m->tagset[m->seltags]) {
			/* prevent displaying all tags (MODKEY-0) when multiple monitors
			* are connected */
			if (newtagset & selmon->tagset[selmon->seltags])
				return;
		m->sel = selmon->sel;
		m->seltags ^= 1;
		m->tagset[m->seltags] = selmon->tagset[selmon->seltags];
		attachclients(m);
		arrange(m);
		break;
	}
	selmon->seltags ^= 1; /* toggle sel tagset */
	if (arg->ui & TAGMASK) {
		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
		selmon->pertag->prevtag = selmon->pertag->curtag;

		if (arg->ui == ~0)
			selmon->pertag->curtag = 0;
		else {
			for (i = 0; !(arg->ui & 1 << i); i++) ;
		selmon->pertag->curtag = i + 1;
		}
	} else {
		tmptag = selmon->pertag->prevtag;
		selmon->pertag->prevtag = selmon->pertag->curtag;
		selmon->pertag->curtag = tmptag;
	}

	selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
	selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
	selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
	selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];

	if (selmon->showbar != selmon->pertag->showbars[selmon->pertag->curtag])
		togglebar(NULL);

	attachclients(selmon);
	arrange(selmon);
	updatecurrentdesktop();
	focus(NULL);
}

Client *
wintoclient(Window w)
{
	Client *c;
	Monitor *m;

	for (m = mons; m; m = m->next)
	for (c = m->cl->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
xinitvisual()
{
	XVisualInfo *infos;
	XRenderPictFormat *fmt;
	int nitems;
	int i;

	XVisualInfo tpl = {
		.screen = screen,
		.depth = 32,
		.class = TrueColor
	};
	long masks = VisualScreenMask | VisualDepthMask | VisualClassMask;

	infos = XGetVisualInfo(dpy, masks, &tpl, &nitems);
	visual = NULL;
	for(i = 0; i < nitems; i ++) {
		fmt = XRenderFindVisualFormat(dpy, infos[i].visual);
		if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
			visual = infos[i].visual;
			depth = infos[i].depth;
			cmap = XCreateColormap(dpy, root, visual, AllocNone);
			useargb = 1;
			break;
		}
	}

	XFree(infos);

	if (! visual) {
		visual = DefaultVisual(dpy, screen);
		depth = DefaultDepth(dpy, screen);
		cmap = DefaultColormap(dpy, screen);
	}
}

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->cl->clients, selmon))
	if (!c || !(c = nexttiled(c->next, selmon)))
	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();
	autostart_exec();
	setup();
	#ifdef __OpenBSD__
	if (pledge("stdio rpath proc exec", NULL) == -1)
	die("pledge");
	#endif /* __OpenBSD__ */
	scan();
	run();
	if(restart) execvp(argv[0], argv);
	cleanup();
	XCloseDisplay(dpy);
	return EXIT_SUCCESS;
}

void
bstack(Monitor *m)
{
	unsigned int i, n, w, mh, mx, tx, ns;
	Client *c;

	for (n = 0, c = nexttiled(m->cl->clients, selmon); c; c = nexttiled(c->next, selmon), n++);
	if (n == 0)
		return;
	if(n == 1){
		c = nexttiled(m->cl->clients, selmon);
		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
		return;
	}

	if (n > m->nmaster){
		mh = m->nmaster ? m->wh * m->mfact : m->gappx;
		ns = 2;
	}
	else{
		mh = m->wh;
		ns = 1;
	}
	for (i = 0, mx = tx = m->gappx, c = nexttiled(m->cl->clients, selmon); c; c = nexttiled(c->next, selmon), i++)
		if (i < m->nmaster) {
			w = (m->ww - mx) / (MIN(n, m->nmaster) - i) - m->gappx;
			resize(c, m->wx + mx, m->wy + m->gappx, w - 2*c->bw, mh - 2*c->bw - m->gappx*(5-ns)/2, 0);
			if(mx + WIDTH(c) + m->gappx < m->mw)
				mx += WIDTH(c) + m->gappx;
		} else {
			w = (m->ww - tx) / (n - i) - m->gappx;
			if(m->nmaster == 0)
				resize(c, m->wx + tx, m->wy + mh, w - (2*c->bw), m->wh - mh - 2*c->bw - m->gappx, False);
			else
				resize(c, m->wx + tx, m->wy + mh + m->gappx/ns, w - (2*c->bw), m->wh - mh - 2*c->bw - m->gappx*(5-ns)/2, False);
			if (tx + WIDTH(c) + m->gappx < m->mw)
				tx += WIDTH(c) + m->gappx;
		}
}