dwm

dynamic window manager
git clone git://git.suckless.org/dwm
Log | Files | Refs | README | LICENSE

dwm.c (52810B)


      1 /* See LICENSE file for copyright and license details.
      2  *
      3  * dynamic window manager is designed like any other X client as well. It is
      4  * driven through handling X events. In contrast to other X clients, a window
      5  * manager selects for SubstructureRedirectMask on the root window, to receive
      6  * events about window (dis-)appearance. Only one X connection at a time is
      7  * allowed to select for this event mask.
      8  *
      9  * The event handlers of dwm are organized in an array which is accessed
     10  * whenever a new event has been fetched. This allows event dispatching
     11  * in O(1) time.
     12  *
     13  * Each child of the root window is called a client, except windows which have
     14  * set the override_redirect flag. Clients are organized in a linked client
     15  * list on each monitor, the focus history is remembered through a stack list
     16  * on each monitor. Each client contains a bit array to indicate the tags of a
     17  * client.
     18  *
     19  * Keys and tagging rules are organized as arrays and defined in config.h.
     20  *
     21  * To understand everything else, start reading main().
     22  */
     23 #include <errno.h>
     24 #include <locale.h>
     25 #include <signal.h>
     26 #include <stdarg.h>
     27 #include <stdio.h>
     28 #include <stdlib.h>
     29 #include <string.h>
     30 #include <unistd.h>
     31 #include <sys/types.h>
     32 #include <sys/wait.h>
     33 #include <X11/cursorfont.h>
     34 #include <X11/keysym.h>
     35 #include <X11/Xatom.h>
     36 #include <X11/Xlib.h>
     37 #include <X11/Xproto.h>
     38 #include <X11/Xutil.h>
     39 #ifdef XINERAMA
     40 #include <X11/extensions/Xinerama.h>
     41 #endif /* XINERAMA */
     42 #include <X11/Xft/Xft.h>
     43 
     44 #include "drw.h"
     45 #include "util.h"
     46 
     47 /* macros */
     48 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
     49 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
     50 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
     51                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
     52 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
     53 #define LENGTH(X)               (sizeof X / sizeof X[0])
     54 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
     55 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
     56 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
     57 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
     58 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
     59 
     60 /* enums */
     61 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
     62 enum { SchemeNorm, SchemeSel }; /* color schemes */
     63 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
     64        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
     65        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
     66 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
     67 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
     68        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
     69 
     70 typedef union {
     71 	int i;
     72 	unsigned int ui;
     73 	float f;
     74 	const void *v;
     75 } Arg;
     76 
     77 typedef struct {
     78 	unsigned int click;
     79 	unsigned int mask;
     80 	unsigned int button;
     81 	void (*func)(const Arg *arg);
     82 	const Arg arg;
     83 } Button;
     84 
     85 typedef struct Monitor Monitor;
     86 typedef struct Client Client;
     87 struct Client {
     88 	char name[256];
     89 	float mina, maxa;
     90 	int x, y, w, h;
     91 	int oldx, oldy, oldw, oldh;
     92 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
     93 	int bw, oldbw;
     94 	unsigned int tags;
     95 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
     96 	Client *next;
     97 	Client *snext;
     98 	Monitor *mon;
     99 	Window win;
    100 };
    101 
    102 typedef struct {
    103 	unsigned int mod;
    104 	KeySym keysym;
    105 	void (*func)(const Arg *);
    106 	const Arg arg;
    107 } Key;
    108 
    109 typedef struct {
    110 	const char *symbol;
    111 	void (*arrange)(Monitor *);
    112 } Layout;
    113 
    114 struct Monitor {
    115 	char ltsymbol[16];
    116 	float mfact;
    117 	int nmaster;
    118 	int num;
    119 	int by;               /* bar geometry */
    120 	int mx, my, mw, mh;   /* screen size */
    121 	int wx, wy, ww, wh;   /* window area  */
    122 	unsigned int seltags;
    123 	unsigned int sellt;
    124 	unsigned int tagset[2];
    125 	int showbar;
    126 	int topbar;
    127 	Client *clients;
    128 	Client *sel;
    129 	Client *stack;
    130 	Monitor *next;
    131 	Window barwin;
    132 	const Layout *lt[2];
    133 };
    134 
    135 typedef struct {
    136 	const char *class;
    137 	const char *instance;
    138 	const char *title;
    139 	unsigned int tags;
    140 	int isfloating;
    141 	int monitor;
    142 } Rule;
    143 
    144 /* function declarations */
    145 static void applyrules(Client *c);
    146 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
    147 static void arrange(Monitor *m);
    148 static void arrangemon(Monitor *m);
    149 static void attach(Client *c);
    150 static void attachstack(Client *c);
    151 static void buttonpress(XEvent *e);
    152 static void checkotherwm(void);
    153 static void cleanup(void);
    154 static void cleanupmon(Monitor *mon);
    155 static void clientmessage(XEvent *e);
    156 static void configure(Client *c);
    157 static void configurenotify(XEvent *e);
    158 static void configurerequest(XEvent *e);
    159 static Monitor *createmon(void);
    160 static void destroynotify(XEvent *e);
    161 static void detach(Client *c);
    162 static void detachstack(Client *c);
    163 static Monitor *dirtomon(int dir);
    164 static void drawbar(Monitor *m);
    165 static void drawbars(void);
    166 static void enternotify(XEvent *e);
    167 static void expose(XEvent *e);
    168 static void focus(Client *c);
    169 static void focusin(XEvent *e);
    170 static void focusmon(const Arg *arg);
    171 static void focusstack(const Arg *arg);
    172 static int getrootptr(int *x, int *y);
    173 static long getstate(Window w);
    174 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
    175 static void grabbuttons(Client *c, int focused);
    176 static void grabkeys(void);
    177 static void incnmaster(const Arg *arg);
    178 static void keypress(XEvent *e);
    179 static void killclient(const Arg *arg);
    180 static void manage(Window w, XWindowAttributes *wa);
    181 static void mappingnotify(XEvent *e);
    182 static void maprequest(XEvent *e);
    183 static void monocle(Monitor *m);
    184 static void motionnotify(XEvent *e);
    185 static void movemouse(const Arg *arg);
    186 static Client *nexttiled(Client *c);
    187 static void pop(Client *);
    188 static void propertynotify(XEvent *e);
    189 static void quit(const Arg *arg);
    190 static Monitor *recttomon(int x, int y, int w, int h);
    191 static void resize(Client *c, int x, int y, int w, int h, int interact);
    192 static void resizeclient(Client *c, int x, int y, int w, int h);
    193 static void resizemouse(const Arg *arg);
    194 static void restack(Monitor *m);
    195 static void run(void);
    196 static void scan(void);
    197 static int sendevent(Client *c, Atom proto);
    198 static void sendmon(Client *c, Monitor *m);
    199 static void setclientstate(Client *c, long state);
    200 static void setfocus(Client *c);
    201 static void setfullscreen(Client *c, int fullscreen);
    202 static void setlayout(const Arg *arg);
    203 static void setmfact(const Arg *arg);
    204 static void setup(void);
    205 static void seturgent(Client *c, int urg);
    206 static void showhide(Client *c);
    207 static void sigchld(int unused);
    208 static void spawn(const Arg *arg);
    209 static void tag(const Arg *arg);
    210 static void tagmon(const Arg *arg);
    211 static void tile(Monitor *);
    212 static void togglebar(const Arg *arg);
    213 static void togglefloating(const Arg *arg);
    214 static void toggletag(const Arg *arg);
    215 static void toggleview(const Arg *arg);
    216 static void unfocus(Client *c, int setfocus);
    217 static void unmanage(Client *c, int destroyed);
    218 static void unmapnotify(XEvent *e);
    219 static void updatebarpos(Monitor *m);
    220 static void updatebars(void);
    221 static void updateclientlist(void);
    222 static int updategeom(void);
    223 static void updatenumlockmask(void);
    224 static void updatesizehints(Client *c);
    225 static void updatestatus(void);
    226 static void updatetitle(Client *c);
    227 static void updatewindowtype(Client *c);
    228 static void updatewmhints(Client *c);
    229 static void view(const Arg *arg);
    230 static Client *wintoclient(Window w);
    231 static Monitor *wintomon(Window w);
    232 static int xerror(Display *dpy, XErrorEvent *ee);
    233 static int xerrordummy(Display *dpy, XErrorEvent *ee);
    234 static int xerrorstart(Display *dpy, XErrorEvent *ee);
    235 static void zoom(const Arg *arg);
    236 
    237 /* variables */
    238 static const char broken[] = "broken";
    239 static char stext[256];
    240 static int screen;
    241 static int sw, sh;           /* X display screen geometry width, height */
    242 static int bh, blw = 0;      /* bar geometry */
    243 static int lrpad;            /* sum of left and right padding for text */
    244 static int (*xerrorxlib)(Display *, XErrorEvent *);
    245 static unsigned int numlockmask = 0;
    246 static void (*handler[LASTEvent]) (XEvent *) = {
    247 	[ButtonPress] = buttonpress,
    248 	[ClientMessage] = clientmessage,
    249 	[ConfigureRequest] = configurerequest,
    250 	[ConfigureNotify] = configurenotify,
    251 	[DestroyNotify] = destroynotify,
    252 	[EnterNotify] = enternotify,
    253 	[Expose] = expose,
    254 	[FocusIn] = focusin,
    255 	[KeyPress] = keypress,
    256 	[MappingNotify] = mappingnotify,
    257 	[MapRequest] = maprequest,
    258 	[MotionNotify] = motionnotify,
    259 	[PropertyNotify] = propertynotify,
    260 	[UnmapNotify] = unmapnotify
    261 };
    262 static Atom wmatom[WMLast], netatom[NetLast];
    263 static int running = 1;
    264 static Cur *cursor[CurLast];
    265 static Clr **scheme;
    266 static Display *dpy;
    267 static Drw *drw;
    268 static Monitor *mons, *selmon;
    269 static Window root, wmcheckwin;
    270 
    271 /* configuration, allows nested code to access above variables */
    272 #include "config.h"
    273 
    274 /* compile-time check if all tags fit into an unsigned int bit array. */
    275 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
    276 
    277 /* function implementations */
    278 void
    279 applyrules(Client *c)
    280 {
    281 	const char *class, *instance;
    282 	unsigned int i;
    283 	const Rule *r;
    284 	Monitor *m;
    285 	XClassHint ch = { NULL, NULL };
    286 
    287 	/* rule matching */
    288 	c->isfloating = 0;
    289 	c->tags = 0;
    290 	XGetClassHint(dpy, c->win, &ch);
    291 	class    = ch.res_class ? ch.res_class : broken;
    292 	instance = ch.res_name  ? ch.res_name  : broken;
    293 
    294 	for (i = 0; i < LENGTH(rules); i++) {
    295 		r = &rules[i];
    296 		if ((!r->title || strstr(c->name, r->title))
    297 		&& (!r->class || strstr(class, r->class))
    298 		&& (!r->instance || strstr(instance, r->instance)))
    299 		{
    300 			c->isfloating = r->isfloating;
    301 			c->tags |= r->tags;
    302 			for (m = mons; m && m->num != r->monitor; m = m->next);
    303 			if (m)
    304 				c->mon = m;
    305 		}
    306 	}
    307 	if (ch.res_class)
    308 		XFree(ch.res_class);
    309 	if (ch.res_name)
    310 		XFree(ch.res_name);
    311 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
    312 }
    313 
    314 int
    315 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
    316 {
    317 	int baseismin;
    318 	Monitor *m = c->mon;
    319 
    320 	/* set minimum possible */
    321 	*w = MAX(1, *w);
    322 	*h = MAX(1, *h);
    323 	if (interact) {
    324 		if (*x > sw)
    325 			*x = sw - WIDTH(c);
    326 		if (*y > sh)
    327 			*y = sh - HEIGHT(c);
    328 		if (*x + *w + 2 * c->bw < 0)
    329 			*x = 0;
    330 		if (*y + *h + 2 * c->bw < 0)
    331 			*y = 0;
    332 	} else {
    333 		if (*x >= m->wx + m->ww)
    334 			*x = m->wx + m->ww - WIDTH(c);
    335 		if (*y >= m->wy + m->wh)
    336 			*y = m->wy + m->wh - HEIGHT(c);
    337 		if (*x + *w + 2 * c->bw <= m->wx)
    338 			*x = m->wx;
    339 		if (*y + *h + 2 * c->bw <= m->wy)
    340 			*y = m->wy;
    341 	}
    342 	if (*h < bh)
    343 		*h = bh;
    344 	if (*w < bh)
    345 		*w = bh;
    346 	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
    347 		/* see last two sentences in ICCCM 4.1.2.3 */
    348 		baseismin = c->basew == c->minw && c->baseh == c->minh;
    349 		if (!baseismin) { /* temporarily remove base dimensions */
    350 			*w -= c->basew;
    351 			*h -= c->baseh;
    352 		}
    353 		/* adjust for aspect limits */
    354 		if (c->mina > 0 && c->maxa > 0) {
    355 			if (c->maxa < (float)*w / *h)
    356 				*w = *h * c->maxa + 0.5;
    357 			else if (c->mina < (float)*h / *w)
    358 				*h = *w * c->mina + 0.5;
    359 		}
    360 		if (baseismin) { /* increment calculation requires this */
    361 			*w -= c->basew;
    362 			*h -= c->baseh;
    363 		}
    364 		/* adjust for increment value */
    365 		if (c->incw)
    366 			*w -= *w % c->incw;
    367 		if (c->inch)
    368 			*h -= *h % c->inch;
    369 		/* restore base dimensions */
    370 		*w = MAX(*w + c->basew, c->minw);
    371 		*h = MAX(*h + c->baseh, c->minh);
    372 		if (c->maxw)
    373 			*w = MIN(*w, c->maxw);
    374 		if (c->maxh)
    375 			*h = MIN(*h, c->maxh);
    376 	}
    377 	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
    378 }
    379 
    380 void
    381 arrange(Monitor *m)
    382 {
    383 	if (m)
    384 		showhide(m->stack);
    385 	else for (m = mons; m; m = m->next)
    386 		showhide(m->stack);
    387 	if (m) {
    388 		arrangemon(m);
    389 		restack(m);
    390 	} else for (m = mons; m; m = m->next)
    391 		arrangemon(m);
    392 }
    393 
    394 void
    395 arrangemon(Monitor *m)
    396 {
    397 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
    398 	if (m->lt[m->sellt]->arrange)
    399 		m->lt[m->sellt]->arrange(m);
    400 }
    401 
    402 void
    403 attach(Client *c)
    404 {
    405 	c->next = c->mon->clients;
    406 	c->mon->clients = c;
    407 }
    408 
    409 void
    410 attachstack(Client *c)
    411 {
    412 	c->snext = c->mon->stack;
    413 	c->mon->stack = c;
    414 }
    415 
    416 void
    417 buttonpress(XEvent *e)
    418 {
    419 	unsigned int i, x, click;
    420 	Arg arg = {0};
    421 	Client *c;
    422 	Monitor *m;
    423 	XButtonPressedEvent *ev = &e->xbutton;
    424 
    425 	click = ClkRootWin;
    426 	/* focus monitor if necessary */
    427 	if ((m = wintomon(ev->window)) && m != selmon) {
    428 		unfocus(selmon->sel, 1);
    429 		selmon = m;
    430 		focus(NULL);
    431 	}
    432 	if (ev->window == selmon->barwin) {
    433 		i = x = 0;
    434 		do
    435 			x += TEXTW(tags[i]);
    436 		while (ev->x >= x && ++i < LENGTH(tags));
    437 		if (i < LENGTH(tags)) {
    438 			click = ClkTagBar;
    439 			arg.ui = 1 << i;
    440 		} else if (ev->x < x + blw)
    441 			click = ClkLtSymbol;
    442 		else if (ev->x > selmon->ww - TEXTW(stext))
    443 			click = ClkStatusText;
    444 		else
    445 			click = ClkWinTitle;
    446 	} else if ((c = wintoclient(ev->window))) {
    447 		focus(c);
    448 		restack(selmon);
    449 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
    450 		click = ClkClientWin;
    451 	}
    452 	for (i = 0; i < LENGTH(buttons); i++)
    453 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
    454 		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
    455 			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
    456 }
    457 
    458 void
    459 checkotherwm(void)
    460 {
    461 	xerrorxlib = XSetErrorHandler(xerrorstart);
    462 	/* this causes an error if some other window manager is running */
    463 	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
    464 	XSync(dpy, False);
    465 	XSetErrorHandler(xerror);
    466 	XSync(dpy, False);
    467 }
    468 
    469 void
    470 cleanup(void)
    471 {
    472 	Arg a = {.ui = ~0};
    473 	Layout foo = { "", NULL };
    474 	Monitor *m;
    475 	size_t i;
    476 
    477 	view(&a);
    478 	selmon->lt[selmon->sellt] = &foo;
    479 	for (m = mons; m; m = m->next)
    480 		while (m->stack)
    481 			unmanage(m->stack, 0);
    482 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
    483 	while (mons)
    484 		cleanupmon(mons);
    485 	for (i = 0; i < CurLast; i++)
    486 		drw_cur_free(drw, cursor[i]);
    487 	for (i = 0; i < LENGTH(colors); i++)
    488 		free(scheme[i]);
    489 	XDestroyWindow(dpy, wmcheckwin);
    490 	drw_free(drw);
    491 	XSync(dpy, False);
    492 	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
    493 	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    494 }
    495 
    496 void
    497 cleanupmon(Monitor *mon)
    498 {
    499 	Monitor *m;
    500 
    501 	if (mon == mons)
    502 		mons = mons->next;
    503 	else {
    504 		for (m = mons; m && m->next != mon; m = m->next);
    505 		m->next = mon->next;
    506 	}
    507 	XUnmapWindow(dpy, mon->barwin);
    508 	XDestroyWindow(dpy, mon->barwin);
    509 	free(mon);
    510 }
    511 
    512 void
    513 clientmessage(XEvent *e)
    514 {
    515 	XClientMessageEvent *cme = &e->xclient;
    516 	Client *c = wintoclient(cme->window);
    517 
    518 	if (!c)
    519 		return;
    520 	if (cme->message_type == netatom[NetWMState]) {
    521 		if (cme->data.l[1] == netatom[NetWMFullscreen]
    522 		|| cme->data.l[2] == netatom[NetWMFullscreen])
    523 			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
    524 				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
    525 	} else if (cme->message_type == netatom[NetActiveWindow]) {
    526 		if (c != selmon->sel && !c->isurgent)
    527 			seturgent(c, 1);
    528 	}
    529 }
    530 
    531 void
    532 configure(Client *c)
    533 {
    534 	XConfigureEvent ce;
    535 
    536 	ce.type = ConfigureNotify;
    537 	ce.display = dpy;
    538 	ce.event = c->win;
    539 	ce.window = c->win;
    540 	ce.x = c->x;
    541 	ce.y = c->y;
    542 	ce.width = c->w;
    543 	ce.height = c->h;
    544 	ce.border_width = c->bw;
    545 	ce.above = None;
    546 	ce.override_redirect = False;
    547 	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
    548 }
    549 
    550 void
    551 configurenotify(XEvent *e)
    552 {
    553 	Monitor *m;
    554 	Client *c;
    555 	XConfigureEvent *ev = &e->xconfigure;
    556 	int dirty;
    557 
    558 	/* TODO: updategeom handling sucks, needs to be simplified */
    559 	if (ev->window == root) {
    560 		dirty = (sw != ev->width || sh != ev->height);
    561 		sw = ev->width;
    562 		sh = ev->height;
    563 		if (updategeom() || dirty) {
    564 			drw_resize(drw, sw, bh);
    565 			updatebars();
    566 			for (m = mons; m; m = m->next) {
    567 				for (c = m->clients; c; c = c->next)
    568 					if (c->isfullscreen)
    569 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
    570 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
    571 			}
    572 			focus(NULL);
    573 			arrange(NULL);
    574 		}
    575 	}
    576 }
    577 
    578 void
    579 configurerequest(XEvent *e)
    580 {
    581 	Client *c;
    582 	Monitor *m;
    583 	XConfigureRequestEvent *ev = &e->xconfigurerequest;
    584 	XWindowChanges wc;
    585 
    586 	if ((c = wintoclient(ev->window))) {
    587 		if (ev->value_mask & CWBorderWidth)
    588 			c->bw = ev->border_width;
    589 		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
    590 			m = c->mon;
    591 			if (ev->value_mask & CWX) {
    592 				c->oldx = c->x;
    593 				c->x = m->mx + ev->x;
    594 			}
    595 			if (ev->value_mask & CWY) {
    596 				c->oldy = c->y;
    597 				c->y = m->my + ev->y;
    598 			}
    599 			if (ev->value_mask & CWWidth) {
    600 				c->oldw = c->w;
    601 				c->w = ev->width;
    602 			}
    603 			if (ev->value_mask & CWHeight) {
    604 				c->oldh = c->h;
    605 				c->h = ev->height;
    606 			}
    607 			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
    608 				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
    609 			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
    610 				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
    611 			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
    612 				configure(c);
    613 			if (ISVISIBLE(c))
    614 				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    615 		} else
    616 			configure(c);
    617 	} else {
    618 		wc.x = ev->x;
    619 		wc.y = ev->y;
    620 		wc.width = ev->width;
    621 		wc.height = ev->height;
    622 		wc.border_width = ev->border_width;
    623 		wc.sibling = ev->above;
    624 		wc.stack_mode = ev->detail;
    625 		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
    626 	}
    627 	XSync(dpy, False);
    628 }
    629 
    630 Monitor *
    631 createmon(void)
    632 {
    633 	Monitor *m;
    634 
    635 	m = ecalloc(1, sizeof(Monitor));
    636 	m->tagset[0] = m->tagset[1] = 1;
    637 	m->mfact = mfact;
    638 	m->nmaster = nmaster;
    639 	m->showbar = showbar;
    640 	m->topbar = topbar;
    641 	m->lt[0] = &layouts[0];
    642 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
    643 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
    644 	return m;
    645 }
    646 
    647 void
    648 destroynotify(XEvent *e)
    649 {
    650 	Client *c;
    651 	XDestroyWindowEvent *ev = &e->xdestroywindow;
    652 
    653 	if ((c = wintoclient(ev->window)))
    654 		unmanage(c, 1);
    655 }
    656 
    657 void
    658 detach(Client *c)
    659 {
    660 	Client **tc;
    661 
    662 	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
    663 	*tc = c->next;
    664 }
    665 
    666 void
    667 detachstack(Client *c)
    668 {
    669 	Client **tc, *t;
    670 
    671 	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
    672 	*tc = c->snext;
    673 
    674 	if (c == c->mon->sel) {
    675 		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
    676 		c->mon->sel = t;
    677 	}
    678 }
    679 
    680 Monitor *
    681 dirtomon(int dir)
    682 {
    683 	Monitor *m = NULL;
    684 
    685 	if (dir > 0) {
    686 		if (!(m = selmon->next))
    687 			m = mons;
    688 	} else if (selmon == mons)
    689 		for (m = mons; m->next; m = m->next);
    690 	else
    691 		for (m = mons; m->next != selmon; m = m->next);
    692 	return m;
    693 }
    694 
    695 void
    696 drawbar(Monitor *m)
    697 {
    698 	int x, w, sw = 0;
    699 	int boxs = drw->fonts->h / 9;
    700 	int boxw = drw->fonts->h / 6 + 2;
    701 	unsigned int i, occ = 0, urg = 0;
    702 	Client *c;
    703 
    704 	/* draw status first so it can be overdrawn by tags later */
    705 	if (m == selmon) { /* status is only drawn on selected monitor */
    706 		drw_setscheme(drw, scheme[SchemeNorm]);
    707 		sw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
    708 		drw_text(drw, m->ww - sw, 0, sw, bh, 0, stext, 0);
    709 	}
    710 
    711 	for (c = m->clients; c; c = c->next) {
    712 		occ |= c->tags;
    713 		if (c->isurgent)
    714 			urg |= c->tags;
    715 	}
    716 	x = 0;
    717 	for (i = 0; i < LENGTH(tags); i++) {
    718 		w = TEXTW(tags[i]);
    719 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
    720 		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
    721 		if (occ & 1 << i)
    722 			drw_rect(drw, x + boxs, boxs, boxw, boxw,
    723 				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
    724 				urg & 1 << i);
    725 		x += w;
    726 	}
    727 	w = blw = TEXTW(m->ltsymbol);
    728 	drw_setscheme(drw, scheme[SchemeNorm]);
    729 	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
    730 
    731 	if ((w = m->ww - sw - x) > bh) {
    732 		if (m->sel) {
    733 			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
    734 			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
    735 			if (m->sel->isfloating)
    736 				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
    737 		} else {
    738 			drw_setscheme(drw, scheme[SchemeNorm]);
    739 			drw_rect(drw, x, 0, w, bh, 1, 1);
    740 		}
    741 	}
    742 	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
    743 }
    744 
    745 void
    746 drawbars(void)
    747 {
    748 	Monitor *m;
    749 
    750 	for (m = mons; m; m = m->next)
    751 		drawbar(m);
    752 }
    753 
    754 void
    755 enternotify(XEvent *e)
    756 {
    757 	Client *c;
    758 	Monitor *m;
    759 	XCrossingEvent *ev = &e->xcrossing;
    760 
    761 	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
    762 		return;
    763 	c = wintoclient(ev->window);
    764 	m = c ? c->mon : wintomon(ev->window);
    765 	if (m != selmon) {
    766 		unfocus(selmon->sel, 1);
    767 		selmon = m;
    768 	} else if (!c || c == selmon->sel)
    769 		return;
    770 	focus(c);
    771 }
    772 
    773 void
    774 expose(XEvent *e)
    775 {
    776 	Monitor *m;
    777 	XExposeEvent *ev = &e->xexpose;
    778 
    779 	if (ev->count == 0 && (m = wintomon(ev->window)))
    780 		drawbar(m);
    781 }
    782 
    783 void
    784 focus(Client *c)
    785 {
    786 	if (!c || !ISVISIBLE(c))
    787 		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
    788 	if (selmon->sel && selmon->sel != c)
    789 		unfocus(selmon->sel, 0);
    790 	if (c) {
    791 		if (c->mon != selmon)
    792 			selmon = c->mon;
    793 		if (c->isurgent)
    794 			seturgent(c, 0);
    795 		detachstack(c);
    796 		attachstack(c);
    797 		grabbuttons(c, 1);
    798 		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
    799 		setfocus(c);
    800 	} else {
    801 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
    802 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    803 	}
    804 	selmon->sel = c;
    805 	drawbars();
    806 }
    807 
    808 /* there are some broken focus acquiring clients needing extra handling */
    809 void
    810 focusin(XEvent *e)
    811 {
    812 	XFocusChangeEvent *ev = &e->xfocus;
    813 
    814 	if (selmon->sel && ev->window != selmon->sel->win)
    815 		setfocus(selmon->sel);
    816 }
    817 
    818 void
    819 focusmon(const Arg *arg)
    820 {
    821 	Monitor *m;
    822 
    823 	if (!mons->next)
    824 		return;
    825 	if ((m = dirtomon(arg->i)) == selmon)
    826 		return;
    827 	unfocus(selmon->sel, 0);
    828 	selmon = m;
    829 	focus(NULL);
    830 }
    831 
    832 void
    833 focusstack(const Arg *arg)
    834 {
    835 	Client *c = NULL, *i;
    836 
    837 	if (!selmon->sel)
    838 		return;
    839 	if (arg->i > 0) {
    840 		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
    841 		if (!c)
    842 			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
    843 	} else {
    844 		for (i = selmon->clients; i != selmon->sel; i = i->next)
    845 			if (ISVISIBLE(i))
    846 				c = i;
    847 		if (!c)
    848 			for (; i; i = i->next)
    849 				if (ISVISIBLE(i))
    850 					c = i;
    851 	}
    852 	if (c) {
    853 		focus(c);
    854 		restack(selmon);
    855 	}
    856 }
    857 
    858 Atom
    859 getatomprop(Client *c, Atom prop)
    860 {
    861 	int di;
    862 	unsigned long dl;
    863 	unsigned char *p = NULL;
    864 	Atom da, atom = None;
    865 
    866 	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
    867 		&da, &di, &dl, &dl, &p) == Success && p) {
    868 		atom = *(Atom *)p;
    869 		XFree(p);
    870 	}
    871 	return atom;
    872 }
    873 
    874 int
    875 getrootptr(int *x, int *y)
    876 {
    877 	int di;
    878 	unsigned int dui;
    879 	Window dummy;
    880 
    881 	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
    882 }
    883 
    884 long
    885 getstate(Window w)
    886 {
    887 	int format;
    888 	long result = -1;
    889 	unsigned char *p = NULL;
    890 	unsigned long n, extra;
    891 	Atom real;
    892 
    893 	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
    894 		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
    895 		return -1;
    896 	if (n != 0)
    897 		result = *p;
    898 	XFree(p);
    899 	return result;
    900 }
    901 
    902 int
    903 gettextprop(Window w, Atom atom, char *text, unsigned int size)
    904 {
    905 	char **list = NULL;
    906 	int n;
    907 	XTextProperty name;
    908 
    909 	if (!text || size == 0)
    910 		return 0;
    911 	text[0] = '\0';
    912 	if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
    913 		return 0;
    914 	if (name.encoding == XA_STRING)
    915 		strncpy(text, (char *)name.value, size - 1);
    916 	else {
    917 		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
    918 			strncpy(text, *list, size - 1);
    919 			XFreeStringList(list);
    920 		}
    921 	}
    922 	text[size - 1] = '\0';
    923 	XFree(name.value);
    924 	return 1;
    925 }
    926 
    927 void
    928 grabbuttons(Client *c, int focused)
    929 {
    930 	updatenumlockmask();
    931 	{
    932 		unsigned int i, j;
    933 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
    934 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
    935 		if (!focused)
    936 			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
    937 				BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
    938 		for (i = 0; i < LENGTH(buttons); i++)
    939 			if (buttons[i].click == ClkClientWin)
    940 				for (j = 0; j < LENGTH(modifiers); j++)
    941 					XGrabButton(dpy, buttons[i].button,
    942 						buttons[i].mask | modifiers[j],
    943 						c->win, False, BUTTONMASK,
    944 						GrabModeAsync, GrabModeSync, None, None);
    945 	}
    946 }
    947 
    948 void
    949 grabkeys(void)
    950 {
    951 	updatenumlockmask();
    952 	{
    953 		unsigned int i, j;
    954 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
    955 		KeyCode code;
    956 
    957 		XUngrabKey(dpy, AnyKey, AnyModifier, root);
    958 		for (i = 0; i < LENGTH(keys); i++)
    959 			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
    960 				for (j = 0; j < LENGTH(modifiers); j++)
    961 					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
    962 						True, GrabModeAsync, GrabModeAsync);
    963 	}
    964 }
    965 
    966 void
    967 incnmaster(const Arg *arg)
    968 {
    969 	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
    970 	arrange(selmon);
    971 }
    972 
    973 #ifdef XINERAMA
    974 static int
    975 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
    976 {
    977 	while (n--)
    978 		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
    979 		&& unique[n].width == info->width && unique[n].height == info->height)
    980 			return 0;
    981 	return 1;
    982 }
    983 #endif /* XINERAMA */
    984 
    985 void
    986 keypress(XEvent *e)
    987 {
    988 	unsigned int i;
    989 	KeySym keysym;
    990 	XKeyEvent *ev;
    991 
    992 	ev = &e->xkey;
    993 	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
    994 	for (i = 0; i < LENGTH(keys); i++)
    995 		if (keysym == keys[i].keysym
    996 		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
    997 		&& keys[i].func)
    998 			keys[i].func(&(keys[i].arg));
    999 }
   1000 
   1001 void
   1002 killclient(const Arg *arg)
   1003 {
   1004 	if (!selmon->sel)
   1005 		return;
   1006 	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
   1007 		XGrabServer(dpy);
   1008 		XSetErrorHandler(xerrordummy);
   1009 		XSetCloseDownMode(dpy, DestroyAll);
   1010 		XKillClient(dpy, selmon->sel->win);
   1011 		XSync(dpy, False);
   1012 		XSetErrorHandler(xerror);
   1013 		XUngrabServer(dpy);
   1014 	}
   1015 }
   1016 
   1017 void
   1018 manage(Window w, XWindowAttributes *wa)
   1019 {
   1020 	Client *c, *t = NULL;
   1021 	Window trans = None;
   1022 	XWindowChanges wc;
   1023 
   1024 	c = ecalloc(1, sizeof(Client));
   1025 	c->win = w;
   1026 	/* geometry */
   1027 	c->x = c->oldx = wa->x;
   1028 	c->y = c->oldy = wa->y;
   1029 	c->w = c->oldw = wa->width;
   1030 	c->h = c->oldh = wa->height;
   1031 	c->oldbw = wa->border_width;
   1032 
   1033 	updatetitle(c);
   1034 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
   1035 		c->mon = t->mon;
   1036 		c->tags = t->tags;
   1037 	} else {
   1038 		c->mon = selmon;
   1039 		applyrules(c);
   1040 	}
   1041 
   1042 	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
   1043 		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
   1044 	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
   1045 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
   1046 	c->x = MAX(c->x, c->mon->mx);
   1047 	/* only fix client y-offset, if the client center might cover the bar */
   1048 	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
   1049 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
   1050 	c->bw = borderpx;
   1051 
   1052 	wc.border_width = c->bw;
   1053 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
   1054 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
   1055 	configure(c); /* propagates border_width, if size doesn't change */
   1056 	updatewindowtype(c);
   1057 	updatesizehints(c);
   1058 	updatewmhints(c);
   1059 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
   1060 	grabbuttons(c, 0);
   1061 	if (!c->isfloating)
   1062 		c->isfloating = c->oldstate = trans != None || c->isfixed;
   1063 	if (c->isfloating)
   1064 		XRaiseWindow(dpy, c->win);
   1065 	attach(c);
   1066 	attachstack(c);
   1067 	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
   1068 		(unsigned char *) &(c->win), 1);
   1069 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
   1070 	setclientstate(c, NormalState);
   1071 	if (c->mon == selmon)
   1072 		unfocus(selmon->sel, 0);
   1073 	c->mon->sel = c;
   1074 	arrange(c->mon);
   1075 	XMapWindow(dpy, c->win);
   1076 	focus(NULL);
   1077 }
   1078 
   1079 void
   1080 mappingnotify(XEvent *e)
   1081 {
   1082 	XMappingEvent *ev = &e->xmapping;
   1083 
   1084 	XRefreshKeyboardMapping(ev);
   1085 	if (ev->request == MappingKeyboard)
   1086 		grabkeys();
   1087 }
   1088 
   1089 void
   1090 maprequest(XEvent *e)
   1091 {
   1092 	static XWindowAttributes wa;
   1093 	XMapRequestEvent *ev = &e->xmaprequest;
   1094 
   1095 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
   1096 		return;
   1097 	if (wa.override_redirect)
   1098 		return;
   1099 	if (!wintoclient(ev->window))
   1100 		manage(ev->window, &wa);
   1101 }
   1102 
   1103 void
   1104 monocle(Monitor *m)
   1105 {
   1106 	unsigned int n = 0;
   1107 	Client *c;
   1108 
   1109 	for (c = m->clients; c; c = c->next)
   1110 		if (ISVISIBLE(c))
   1111 			n++;
   1112 	if (n > 0) /* override layout symbol */
   1113 		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
   1114 	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
   1115 		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
   1116 }
   1117 
   1118 void
   1119 motionnotify(XEvent *e)
   1120 {
   1121 	static Monitor *mon = NULL;
   1122 	Monitor *m;
   1123 	XMotionEvent *ev = &e->xmotion;
   1124 
   1125 	if (ev->window != root)
   1126 		return;
   1127 	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
   1128 		unfocus(selmon->sel, 1);
   1129 		selmon = m;
   1130 		focus(NULL);
   1131 	}
   1132 	mon = m;
   1133 }
   1134 
   1135 void
   1136 movemouse(const Arg *arg)
   1137 {
   1138 	int x, y, ocx, ocy, nx, ny;
   1139 	Client *c;
   1140 	Monitor *m;
   1141 	XEvent ev;
   1142 	Time lasttime = 0;
   1143 
   1144 	if (!(c = selmon->sel))
   1145 		return;
   1146 	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
   1147 		return;
   1148 	restack(selmon);
   1149 	ocx = c->x;
   1150 	ocy = c->y;
   1151 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1152 		None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
   1153 		return;
   1154 	if (!getrootptr(&x, &y))
   1155 		return;
   1156 	do {
   1157 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1158 		switch(ev.type) {
   1159 		case ConfigureRequest:
   1160 		case Expose:
   1161 		case MapRequest:
   1162 			handler[ev.type](&ev);
   1163 			break;
   1164 		case MotionNotify:
   1165 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1166 				continue;
   1167 			lasttime = ev.xmotion.time;
   1168 
   1169 			nx = ocx + (ev.xmotion.x - x);
   1170 			ny = ocy + (ev.xmotion.y - y);
   1171 			if (abs(selmon->wx - nx) < snap)
   1172 				nx = selmon->wx;
   1173 			else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
   1174 				nx = selmon->wx + selmon->ww - WIDTH(c);
   1175 			if (abs(selmon->wy - ny) < snap)
   1176 				ny = selmon->wy;
   1177 			else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
   1178 				ny = selmon->wy + selmon->wh - HEIGHT(c);
   1179 			if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1180 			&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
   1181 				togglefloating(NULL);
   1182 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1183 				resize(c, nx, ny, c->w, c->h, 1);
   1184 			break;
   1185 		}
   1186 	} while (ev.type != ButtonRelease);
   1187 	XUngrabPointer(dpy, CurrentTime);
   1188 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1189 		sendmon(c, m);
   1190 		selmon = m;
   1191 		focus(NULL);
   1192 	}
   1193 }
   1194 
   1195 Client *
   1196 nexttiled(Client *c)
   1197 {
   1198 	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
   1199 	return c;
   1200 }
   1201 
   1202 void
   1203 pop(Client *c)
   1204 {
   1205 	detach(c);
   1206 	attach(c);
   1207 	focus(c);
   1208 	arrange(c->mon);
   1209 }
   1210 
   1211 void
   1212 propertynotify(XEvent *e)
   1213 {
   1214 	Client *c;
   1215 	Window trans;
   1216 	XPropertyEvent *ev = &e->xproperty;
   1217 
   1218 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
   1219 		updatestatus();
   1220 	else if (ev->state == PropertyDelete)
   1221 		return; /* ignore */
   1222 	else if ((c = wintoclient(ev->window))) {
   1223 		switch(ev->atom) {
   1224 		default: break;
   1225 		case XA_WM_TRANSIENT_FOR:
   1226 			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
   1227 				(c->isfloating = (wintoclient(trans)) != NULL))
   1228 				arrange(c->mon);
   1229 			break;
   1230 		case XA_WM_NORMAL_HINTS:
   1231 			updatesizehints(c);
   1232 			break;
   1233 		case XA_WM_HINTS:
   1234 			updatewmhints(c);
   1235 			drawbars();
   1236 			break;
   1237 		}
   1238 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
   1239 			updatetitle(c);
   1240 			if (c == c->mon->sel)
   1241 				drawbar(c->mon);
   1242 		}
   1243 		if (ev->atom == netatom[NetWMWindowType])
   1244 			updatewindowtype(c);
   1245 	}
   1246 }
   1247 
   1248 void
   1249 quit(const Arg *arg)
   1250 {
   1251 	running = 0;
   1252 }
   1253 
   1254 Monitor *
   1255 recttomon(int x, int y, int w, int h)
   1256 {
   1257 	Monitor *m, *r = selmon;
   1258 	int a, area = 0;
   1259 
   1260 	for (m = mons; m; m = m->next)
   1261 		if ((a = INTERSECT(x, y, w, h, m)) > area) {
   1262 			area = a;
   1263 			r = m;
   1264 		}
   1265 	return r;
   1266 }
   1267 
   1268 void
   1269 resize(Client *c, int x, int y, int w, int h, int interact)
   1270 {
   1271 	if (applysizehints(c, &x, &y, &w, &h, interact))
   1272 		resizeclient(c, x, y, w, h);
   1273 }
   1274 
   1275 void
   1276 resizeclient(Client *c, int x, int y, int w, int h)
   1277 {
   1278 	XWindowChanges wc;
   1279 
   1280 	c->oldx = c->x; c->x = wc.x = x;
   1281 	c->oldy = c->y; c->y = wc.y = y;
   1282 	c->oldw = c->w; c->w = wc.width = w;
   1283 	c->oldh = c->h; c->h = wc.height = h;
   1284 	wc.border_width = c->bw;
   1285 	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
   1286 	configure(c);
   1287 	XSync(dpy, False);
   1288 }
   1289 
   1290 void
   1291 resizemouse(const Arg *arg)
   1292 {
   1293 	int ocx, ocy, nw, nh;
   1294 	Client *c;
   1295 	Monitor *m;
   1296 	XEvent ev;
   1297 	Time lasttime = 0;
   1298 
   1299 	if (!(c = selmon->sel))
   1300 		return;
   1301 	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
   1302 		return;
   1303 	restack(selmon);
   1304 	ocx = c->x;
   1305 	ocy = c->y;
   1306 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1307 		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
   1308 		return;
   1309 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1310 	do {
   1311 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1312 		switch(ev.type) {
   1313 		case ConfigureRequest:
   1314 		case Expose:
   1315 		case MapRequest:
   1316 			handler[ev.type](&ev);
   1317 			break;
   1318 		case MotionNotify:
   1319 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1320 				continue;
   1321 			lasttime = ev.xmotion.time;
   1322 
   1323 			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
   1324 			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
   1325 			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
   1326 			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
   1327 			{
   1328 				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1329 				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
   1330 					togglefloating(NULL);
   1331 			}
   1332 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1333 				resize(c, c->x, c->y, nw, nh, 1);
   1334 			break;
   1335 		}
   1336 	} while (ev.type != ButtonRelease);
   1337 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1338 	XUngrabPointer(dpy, CurrentTime);
   1339 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1340 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1341 		sendmon(c, m);
   1342 		selmon = m;
   1343 		focus(NULL);
   1344 	}
   1345 }
   1346 
   1347 void
   1348 restack(Monitor *m)
   1349 {
   1350 	Client *c;
   1351 	XEvent ev;
   1352 	XWindowChanges wc;
   1353 
   1354 	drawbar(m);
   1355 	if (!m->sel)
   1356 		return;
   1357 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
   1358 		XRaiseWindow(dpy, m->sel->win);
   1359 	if (m->lt[m->sellt]->arrange) {
   1360 		wc.stack_mode = Below;
   1361 		wc.sibling = m->barwin;
   1362 		for (c = m->stack; c; c = c->snext)
   1363 			if (!c->isfloating && ISVISIBLE(c)) {
   1364 				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
   1365 				wc.sibling = c->win;
   1366 			}
   1367 	}
   1368 	XSync(dpy, False);
   1369 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1370 }
   1371 
   1372 void
   1373 run(void)
   1374 {
   1375 	XEvent ev;
   1376 	/* main event loop */
   1377 	XSync(dpy, False);
   1378 	while (running && !XNextEvent(dpy, &ev))
   1379 		if (handler[ev.type])
   1380 			handler[ev.type](&ev); /* call handler */
   1381 }
   1382 
   1383 void
   1384 scan(void)
   1385 {
   1386 	unsigned int i, num;
   1387 	Window d1, d2, *wins = NULL;
   1388 	XWindowAttributes wa;
   1389 
   1390 	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
   1391 		for (i = 0; i < num; i++) {
   1392 			if (!XGetWindowAttributes(dpy, wins[i], &wa)
   1393 			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
   1394 				continue;
   1395 			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
   1396 				manage(wins[i], &wa);
   1397 		}
   1398 		for (i = 0; i < num; i++) { /* now the transients */
   1399 			if (!XGetWindowAttributes(dpy, wins[i], &wa))
   1400 				continue;
   1401 			if (XGetTransientForHint(dpy, wins[i], &d1)
   1402 			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
   1403 				manage(wins[i], &wa);
   1404 		}
   1405 		if (wins)
   1406 			XFree(wins);
   1407 	}
   1408 }
   1409 
   1410 void
   1411 sendmon(Client *c, Monitor *m)
   1412 {
   1413 	if (c->mon == m)
   1414 		return;
   1415 	unfocus(c, 1);
   1416 	detach(c);
   1417 	detachstack(c);
   1418 	c->mon = m;
   1419 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
   1420 	attach(c);
   1421 	attachstack(c);
   1422 	focus(NULL);
   1423 	arrange(NULL);
   1424 }
   1425 
   1426 void
   1427 setclientstate(Client *c, long state)
   1428 {
   1429 	long data[] = { state, None };
   1430 
   1431 	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
   1432 		PropModeReplace, (unsigned char *)data, 2);
   1433 }
   1434 
   1435 int
   1436 sendevent(Client *c, Atom proto)
   1437 {
   1438 	int n;
   1439 	Atom *protocols;
   1440 	int exists = 0;
   1441 	XEvent ev;
   1442 
   1443 	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
   1444 		while (!exists && n--)
   1445 			exists = protocols[n] == proto;
   1446 		XFree(protocols);
   1447 	}
   1448 	if (exists) {
   1449 		ev.type = ClientMessage;
   1450 		ev.xclient.window = c->win;
   1451 		ev.xclient.message_type = wmatom[WMProtocols];
   1452 		ev.xclient.format = 32;
   1453 		ev.xclient.data.l[0] = proto;
   1454 		ev.xclient.data.l[1] = CurrentTime;
   1455 		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
   1456 	}
   1457 	return exists;
   1458 }
   1459 
   1460 void
   1461 setfocus(Client *c)
   1462 {
   1463 	if (!c->neverfocus) {
   1464 		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
   1465 		XChangeProperty(dpy, root, netatom[NetActiveWindow],
   1466 			XA_WINDOW, 32, PropModeReplace,
   1467 			(unsigned char *) &(c->win), 1);
   1468 	}
   1469 	sendevent(c, wmatom[WMTakeFocus]);
   1470 }
   1471 
   1472 void
   1473 setfullscreen(Client *c, int fullscreen)
   1474 {
   1475 	if (fullscreen && !c->isfullscreen) {
   1476 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1477 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
   1478 		c->isfullscreen = 1;
   1479 		c->oldstate = c->isfloating;
   1480 		c->oldbw = c->bw;
   1481 		c->bw = 0;
   1482 		c->isfloating = 1;
   1483 		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
   1484 		XRaiseWindow(dpy, c->win);
   1485 	} else if (!fullscreen && c->isfullscreen){
   1486 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1487 			PropModeReplace, (unsigned char*)0, 0);
   1488 		c->isfullscreen = 0;
   1489 		c->isfloating = c->oldstate;
   1490 		c->bw = c->oldbw;
   1491 		c->x = c->oldx;
   1492 		c->y = c->oldy;
   1493 		c->w = c->oldw;
   1494 		c->h = c->oldh;
   1495 		resizeclient(c, c->x, c->y, c->w, c->h);
   1496 		arrange(c->mon);
   1497 	}
   1498 }
   1499 
   1500 void
   1501 setlayout(const Arg *arg)
   1502 {
   1503 	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
   1504 		selmon->sellt ^= 1;
   1505 	if (arg && arg->v)
   1506 		selmon->lt[selmon->sellt] = (Layout *)arg->v;
   1507 	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
   1508 	if (selmon->sel)
   1509 		arrange(selmon);
   1510 	else
   1511 		drawbar(selmon);
   1512 }
   1513 
   1514 /* arg > 1.0 will set mfact absolutely */
   1515 void
   1516 setmfact(const Arg *arg)
   1517 {
   1518 	float f;
   1519 
   1520 	if (!arg || !selmon->lt[selmon->sellt]->arrange)
   1521 		return;
   1522 	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
   1523 	if (f < 0.1 || f > 0.9)
   1524 		return;
   1525 	selmon->mfact = f;
   1526 	arrange(selmon);
   1527 }
   1528 
   1529 void
   1530 setup(void)
   1531 {
   1532 	int i;
   1533 	XSetWindowAttributes wa;
   1534 	Atom utf8string;
   1535 
   1536 	/* clean up any zombies immediately */
   1537 	sigchld(0);
   1538 
   1539 	/* init screen */
   1540 	screen = DefaultScreen(dpy);
   1541 	sw = DisplayWidth(dpy, screen);
   1542 	sh = DisplayHeight(dpy, screen);
   1543 	root = RootWindow(dpy, screen);
   1544 	drw = drw_create(dpy, screen, root, sw, sh);
   1545 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
   1546 		die("no fonts could be loaded.");
   1547 	lrpad = drw->fonts->h;
   1548 	bh = drw->fonts->h + 2;
   1549 	updategeom();
   1550 	/* init atoms */
   1551 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
   1552 	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
   1553 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
   1554 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
   1555 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
   1556 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
   1557 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
   1558 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
   1559 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
   1560 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
   1561 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
   1562 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
   1563 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
   1564 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
   1565 	/* init cursors */
   1566 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
   1567 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
   1568 	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
   1569 	/* init appearance */
   1570 	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
   1571 	for (i = 0; i < LENGTH(colors); i++)
   1572 		scheme[i] = drw_scm_create(drw, colors[i], 3);
   1573 	/* init bars */
   1574 	updatebars();
   1575 	updatestatus();
   1576 	/* supporting window for NetWMCheck */
   1577 	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
   1578 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
   1579 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1580 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
   1581 		PropModeReplace, (unsigned char *) "dwm", 3);
   1582 	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
   1583 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1584 	/* EWMH support per view */
   1585 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
   1586 		PropModeReplace, (unsigned char *) netatom, NetLast);
   1587 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1588 	/* select events */
   1589 	wa.cursor = cursor[CurNormal]->cursor;
   1590 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
   1591 		|ButtonPressMask|PointerMotionMask|EnterWindowMask
   1592 		|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
   1593 	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
   1594 	XSelectInput(dpy, root, wa.event_mask);
   1595 	grabkeys();
   1596 	focus(NULL);
   1597 }
   1598 
   1599 
   1600 void
   1601 seturgent(Client *c, int urg)
   1602 {
   1603 	XWMHints *wmh;
   1604 
   1605 	c->isurgent = urg;
   1606 	if (!(wmh = XGetWMHints(dpy, c->win)))
   1607 		return;
   1608 	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
   1609 	XSetWMHints(dpy, c->win, wmh);
   1610 	XFree(wmh);
   1611 }
   1612 
   1613 void
   1614 showhide(Client *c)
   1615 {
   1616 	if (!c)
   1617 		return;
   1618 	if (ISVISIBLE(c)) {
   1619 		/* show clients top down */
   1620 		XMoveWindow(dpy, c->win, c->x, c->y);
   1621 		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
   1622 			resize(c, c->x, c->y, c->w, c->h, 0);
   1623 		showhide(c->snext);
   1624 	} else {
   1625 		/* hide clients bottom up */
   1626 		showhide(c->snext);
   1627 		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
   1628 	}
   1629 }
   1630 
   1631 void
   1632 sigchld(int unused)
   1633 {
   1634 	if (signal(SIGCHLD, sigchld) == SIG_ERR)
   1635 		die("can't install SIGCHLD handler:");
   1636 	while (0 < waitpid(-1, NULL, WNOHANG));
   1637 }
   1638 
   1639 void
   1640 spawn(const Arg *arg)
   1641 {
   1642 	if (arg->v == dmenucmd)
   1643 		dmenumon[0] = '0' + selmon->num;
   1644 	if (fork() == 0) {
   1645 		if (dpy)
   1646 			close(ConnectionNumber(dpy));
   1647 		setsid();
   1648 		execvp(((char **)arg->v)[0], (char **)arg->v);
   1649 		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
   1650 		perror(" failed");
   1651 		exit(EXIT_SUCCESS);
   1652 	}
   1653 }
   1654 
   1655 void
   1656 tag(const Arg *arg)
   1657 {
   1658 	if (selmon->sel && arg->ui & TAGMASK) {
   1659 		selmon->sel->tags = arg->ui & TAGMASK;
   1660 		focus(NULL);
   1661 		arrange(selmon);
   1662 	}
   1663 }
   1664 
   1665 void
   1666 tagmon(const Arg *arg)
   1667 {
   1668 	if (!selmon->sel || !mons->next)
   1669 		return;
   1670 	sendmon(selmon->sel, dirtomon(arg->i));
   1671 }
   1672 
   1673 void
   1674 tile(Monitor *m)
   1675 {
   1676 	unsigned int i, n, h, mw, my, ty;
   1677 	Client *c;
   1678 
   1679 	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
   1680 	if (n == 0)
   1681 		return;
   1682 
   1683 	if (n > m->nmaster)
   1684 		mw = m->nmaster ? m->ww * m->mfact : 0;
   1685 	else
   1686 		mw = m->ww;
   1687 	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
   1688 		if (i < m->nmaster) {
   1689 			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
   1690 			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
   1691 			my += HEIGHT(c);
   1692 		} else {
   1693 			h = (m->wh - ty) / (n - i);
   1694 			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
   1695 			ty += HEIGHT(c);
   1696 		}
   1697 }
   1698 
   1699 void
   1700 togglebar(const Arg *arg)
   1701 {
   1702 	selmon->showbar = !selmon->showbar;
   1703 	updatebarpos(selmon);
   1704 	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
   1705 	arrange(selmon);
   1706 }
   1707 
   1708 void
   1709 togglefloating(const Arg *arg)
   1710 {
   1711 	if (!selmon->sel)
   1712 		return;
   1713 	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
   1714 		return;
   1715 	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
   1716 	if (selmon->sel->isfloating)
   1717 		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
   1718 			selmon->sel->w, selmon->sel->h, 0);
   1719 	arrange(selmon);
   1720 }
   1721 
   1722 void
   1723 toggletag(const Arg *arg)
   1724 {
   1725 	unsigned int newtags;
   1726 
   1727 	if (!selmon->sel)
   1728 		return;
   1729 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
   1730 	if (newtags) {
   1731 		selmon->sel->tags = newtags;
   1732 		focus(NULL);
   1733 		arrange(selmon);
   1734 	}
   1735 }
   1736 
   1737 void
   1738 toggleview(const Arg *arg)
   1739 {
   1740 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
   1741 
   1742 	if (newtagset) {
   1743 		selmon->tagset[selmon->seltags] = newtagset;
   1744 		focus(NULL);
   1745 		arrange(selmon);
   1746 	}
   1747 }
   1748 
   1749 void
   1750 unfocus(Client *c, int setfocus)
   1751 {
   1752 	if (!c)
   1753 		return;
   1754 	grabbuttons(c, 0);
   1755 	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
   1756 	if (setfocus) {
   1757 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
   1758 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
   1759 	}
   1760 }
   1761 
   1762 void
   1763 unmanage(Client *c, int destroyed)
   1764 {
   1765 	Monitor *m = c->mon;
   1766 	XWindowChanges wc;
   1767 
   1768 	detach(c);
   1769 	detachstack(c);
   1770 	if (!destroyed) {
   1771 		wc.border_width = c->oldbw;
   1772 		XGrabServer(dpy); /* avoid race conditions */
   1773 		XSetErrorHandler(xerrordummy);
   1774 		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
   1775 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
   1776 		setclientstate(c, WithdrawnState);
   1777 		XSync(dpy, False);
   1778 		XSetErrorHandler(xerror);
   1779 		XUngrabServer(dpy);
   1780 	}
   1781 	free(c);
   1782 	focus(NULL);
   1783 	updateclientlist();
   1784 	arrange(m);
   1785 }
   1786 
   1787 void
   1788 unmapnotify(XEvent *e)
   1789 {
   1790 	Client *c;
   1791 	XUnmapEvent *ev = &e->xunmap;
   1792 
   1793 	if ((c = wintoclient(ev->window))) {
   1794 		if (ev->send_event)
   1795 			setclientstate(c, WithdrawnState);
   1796 		else
   1797 			unmanage(c, 0);
   1798 	}
   1799 }
   1800 
   1801 void
   1802 updatebars(void)
   1803 {
   1804 	Monitor *m;
   1805 	XSetWindowAttributes wa = {
   1806 		.override_redirect = True,
   1807 		.background_pixmap = ParentRelative,
   1808 		.event_mask = ButtonPressMask|ExposureMask
   1809 	};
   1810 	XClassHint ch = {"dwm", "dwm"};
   1811 	for (m = mons; m; m = m->next) {
   1812 		if (m->barwin)
   1813 			continue;
   1814 		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
   1815 				CopyFromParent, DefaultVisual(dpy, screen),
   1816 				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
   1817 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
   1818 		XMapRaised(dpy, m->barwin);
   1819 		XSetClassHint(dpy, m->barwin, &ch);
   1820 	}
   1821 }
   1822 
   1823 void
   1824 updatebarpos(Monitor *m)
   1825 {
   1826 	m->wy = m->my;
   1827 	m->wh = m->mh;
   1828 	if (m->showbar) {
   1829 		m->wh -= bh;
   1830 		m->by = m->topbar ? m->wy : m->wy + m->wh;
   1831 		m->wy = m->topbar ? m->wy + bh : m->wy;
   1832 	} else
   1833 		m->by = -bh;
   1834 }
   1835 
   1836 void
   1837 updateclientlist()
   1838 {
   1839 	Client *c;
   1840 	Monitor *m;
   1841 
   1842 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1843 	for (m = mons; m; m = m->next)
   1844 		for (c = m->clients; c; c = c->next)
   1845 			XChangeProperty(dpy, root, netatom[NetClientList],
   1846 				XA_WINDOW, 32, PropModeAppend,
   1847 				(unsigned char *) &(c->win), 1);
   1848 }
   1849 
   1850 int
   1851 updategeom(void)
   1852 {
   1853 	int dirty = 0;
   1854 
   1855 #ifdef XINERAMA
   1856 	if (XineramaIsActive(dpy)) {
   1857 		int i, j, n, nn;
   1858 		Client *c;
   1859 		Monitor *m;
   1860 		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
   1861 		XineramaScreenInfo *unique = NULL;
   1862 
   1863 		for (n = 0, m = mons; m; m = m->next, n++);
   1864 		/* only consider unique geometries as separate screens */
   1865 		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
   1866 		for (i = 0, j = 0; i < nn; i++)
   1867 			if (isuniquegeom(unique, j, &info[i]))
   1868 				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
   1869 		XFree(info);
   1870 		nn = j;
   1871 		if (n <= nn) { /* new monitors available */
   1872 			for (i = 0; i < (nn - n); i++) {
   1873 				for (m = mons; m && m->next; m = m->next);
   1874 				if (m)
   1875 					m->next = createmon();
   1876 				else
   1877 					mons = createmon();
   1878 			}
   1879 			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
   1880 				if (i >= n
   1881 				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
   1882 				|| unique[i].width != m->mw || unique[i].height != m->mh)
   1883 				{
   1884 					dirty = 1;
   1885 					m->num = i;
   1886 					m->mx = m->wx = unique[i].x_org;
   1887 					m->my = m->wy = unique[i].y_org;
   1888 					m->mw = m->ww = unique[i].width;
   1889 					m->mh = m->wh = unique[i].height;
   1890 					updatebarpos(m);
   1891 				}
   1892 		} else { /* less monitors available nn < n */
   1893 			for (i = nn; i < n; i++) {
   1894 				for (m = mons; m && m->next; m = m->next);
   1895 				while ((c = m->clients)) {
   1896 					dirty = 1;
   1897 					m->clients = c->next;
   1898 					detachstack(c);
   1899 					c->mon = mons;
   1900 					attach(c);
   1901 					attachstack(c);
   1902 				}
   1903 				if (m == selmon)
   1904 					selmon = mons;
   1905 				cleanupmon(m);
   1906 			}
   1907 		}
   1908 		free(unique);
   1909 	} else
   1910 #endif /* XINERAMA */
   1911 	{ /* default monitor setup */
   1912 		if (!mons)
   1913 			mons = createmon();
   1914 		if (mons->mw != sw || mons->mh != sh) {
   1915 			dirty = 1;
   1916 			mons->mw = mons->ww = sw;
   1917 			mons->mh = mons->wh = sh;
   1918 			updatebarpos(mons);
   1919 		}
   1920 	}
   1921 	if (dirty) {
   1922 		selmon = mons;
   1923 		selmon = wintomon(root);
   1924 	}
   1925 	return dirty;
   1926 }
   1927 
   1928 void
   1929 updatenumlockmask(void)
   1930 {
   1931 	unsigned int i, j;
   1932 	XModifierKeymap *modmap;
   1933 
   1934 	numlockmask = 0;
   1935 	modmap = XGetModifierMapping(dpy);
   1936 	for (i = 0; i < 8; i++)
   1937 		for (j = 0; j < modmap->max_keypermod; j++)
   1938 			if (modmap->modifiermap[i * modmap->max_keypermod + j]
   1939 				== XKeysymToKeycode(dpy, XK_Num_Lock))
   1940 				numlockmask = (1 << i);
   1941 	XFreeModifiermap(modmap);
   1942 }
   1943 
   1944 void
   1945 updatesizehints(Client *c)
   1946 {
   1947 	long msize;
   1948 	XSizeHints size;
   1949 
   1950 	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
   1951 		/* size is uninitialized, ensure that size.flags aren't used */
   1952 		size.flags = PSize;
   1953 	if (size.flags & PBaseSize) {
   1954 		c->basew = size.base_width;
   1955 		c->baseh = size.base_height;
   1956 	} else if (size.flags & PMinSize) {
   1957 		c->basew = size.min_width;
   1958 		c->baseh = size.min_height;
   1959 	} else
   1960 		c->basew = c->baseh = 0;
   1961 	if (size.flags & PResizeInc) {
   1962 		c->incw = size.width_inc;
   1963 		c->inch = size.height_inc;
   1964 	} else
   1965 		c->incw = c->inch = 0;
   1966 	if (size.flags & PMaxSize) {
   1967 		c->maxw = size.max_width;
   1968 		c->maxh = size.max_height;
   1969 	} else
   1970 		c->maxw = c->maxh = 0;
   1971 	if (size.flags & PMinSize) {
   1972 		c->minw = size.min_width;
   1973 		c->minh = size.min_height;
   1974 	} else if (size.flags & PBaseSize) {
   1975 		c->minw = size.base_width;
   1976 		c->minh = size.base_height;
   1977 	} else
   1978 		c->minw = c->minh = 0;
   1979 	if (size.flags & PAspect) {
   1980 		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
   1981 		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
   1982 	} else
   1983 		c->maxa = c->mina = 0.0;
   1984 	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
   1985 }
   1986 
   1987 void
   1988 updatestatus(void)
   1989 {
   1990 	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
   1991 		strcpy(stext, "dwm-"VERSION);
   1992 	drawbar(selmon);
   1993 }
   1994 
   1995 void
   1996 updatetitle(Client *c)
   1997 {
   1998 	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
   1999 		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
   2000 	if (c->name[0] == '\0') /* hack to mark broken clients */
   2001 		strcpy(c->name, broken);
   2002 }
   2003 
   2004 void
   2005 updatewindowtype(Client *c)
   2006 {
   2007 	Atom state = getatomprop(c, netatom[NetWMState]);
   2008 	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
   2009 
   2010 	if (state == netatom[NetWMFullscreen])
   2011 		setfullscreen(c, 1);
   2012 	if (wtype == netatom[NetWMWindowTypeDialog])
   2013 		c->isfloating = 1;
   2014 }
   2015 
   2016 void
   2017 updatewmhints(Client *c)
   2018 {
   2019 	XWMHints *wmh;
   2020 
   2021 	if ((wmh = XGetWMHints(dpy, c->win))) {
   2022 		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
   2023 			wmh->flags &= ~XUrgencyHint;
   2024 			XSetWMHints(dpy, c->win, wmh);
   2025 		} else
   2026 			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
   2027 		if (wmh->flags & InputHint)
   2028 			c->neverfocus = !wmh->input;
   2029 		else
   2030 			c->neverfocus = 0;
   2031 		XFree(wmh);
   2032 	}
   2033 }
   2034 
   2035 void
   2036 view(const Arg *arg)
   2037 {
   2038 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
   2039 		return;
   2040 	selmon->seltags ^= 1; /* toggle sel tagset */
   2041 	if (arg->ui & TAGMASK)
   2042 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
   2043 	focus(NULL);
   2044 	arrange(selmon);
   2045 }
   2046 
   2047 Client *
   2048 wintoclient(Window w)
   2049 {
   2050 	Client *c;
   2051 	Monitor *m;
   2052 
   2053 	for (m = mons; m; m = m->next)
   2054 		for (c = m->clients; c; c = c->next)
   2055 			if (c->win == w)
   2056 				return c;
   2057 	return NULL;
   2058 }
   2059 
   2060 Monitor *
   2061 wintomon(Window w)
   2062 {
   2063 	int x, y;
   2064 	Client *c;
   2065 	Monitor *m;
   2066 
   2067 	if (w == root && getrootptr(&x, &y))
   2068 		return recttomon(x, y, 1, 1);
   2069 	for (m = mons; m; m = m->next)
   2070 		if (w == m->barwin)
   2071 			return m;
   2072 	if ((c = wintoclient(w)))
   2073 		return c->mon;
   2074 	return selmon;
   2075 }
   2076 
   2077 /* There's no way to check accesses to destroyed windows, thus those cases are
   2078  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
   2079  * default error handler, which may call exit. */
   2080 int
   2081 xerror(Display *dpy, XErrorEvent *ee)
   2082 {
   2083 	if (ee->error_code == BadWindow
   2084 	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
   2085 	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
   2086 	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
   2087 	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
   2088 	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
   2089 	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
   2090 	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
   2091 	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
   2092 		return 0;
   2093 	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
   2094 		ee->request_code, ee->error_code);
   2095 	return xerrorxlib(dpy, ee); /* may call exit */
   2096 }
   2097 
   2098 int
   2099 xerrordummy(Display *dpy, XErrorEvent *ee)
   2100 {
   2101 	return 0;
   2102 }
   2103 
   2104 /* Startup Error handler to check if another window manager
   2105  * is already running. */
   2106 int
   2107 xerrorstart(Display *dpy, XErrorEvent *ee)
   2108 {
   2109 	die("dwm: another window manager is already running");
   2110 	return -1;
   2111 }
   2112 
   2113 void
   2114 zoom(const Arg *arg)
   2115 {
   2116 	Client *c = selmon->sel;
   2117 
   2118 	if (!selmon->lt[selmon->sellt]->arrange
   2119 	|| (selmon->sel && selmon->sel->isfloating))
   2120 		return;
   2121 	if (c == nexttiled(selmon->clients))
   2122 		if (!c || !(c = nexttiled(c->next)))
   2123 			return;
   2124 	pop(c);
   2125 }
   2126 
   2127 int
   2128 main(int argc, char *argv[])
   2129 {
   2130 	if (argc == 2 && !strcmp("-v", argv[1]))
   2131 		die("dwm-"VERSION);
   2132 	else if (argc != 1)
   2133 		die("usage: dwm [-v]");
   2134 	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
   2135 		fputs("warning: no locale support\n", stderr);
   2136 	if (!(dpy = XOpenDisplay(NULL)))
   2137 		die("dwm: cannot open display");
   2138 	checkotherwm();
   2139 	setup();
   2140 #ifdef __OpenBSD__
   2141 	if (pledge("stdio rpath proc exec", NULL) == -1)
   2142 		die("pledge");
   2143 #endif /* __OpenBSD__ */
   2144 	scan();
   2145 	run();
   2146 	cleanup();
   2147 	XCloseDisplay(dpy);
   2148 	return EXIT_SUCCESS;
   2149 }