dwm.c - dwm - dynamic window manager

dwm.c (57095B)
      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 #include <X11/Xlib-xcb.h>
     44 #include <xcb/res.h>
     45 
     46 #include "drw.h"
     47 #include "util.h"
     48 
     49 /* macros */
     50 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
     51 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
     52 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
     53                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
     54 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
     55 #define LENGTH(X)               (sizeof X / sizeof X[0])
     56 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
     57 #define WIDTH(X)                ((X)->w + 2 * (X)->bw + gappx)
     58 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw + gappx)
     59 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
     60 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
     61 
     62 /* enums */
     63 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
     64 enum { SchemeNorm, SchemeSel }; /* color schemes */
     65 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
     66        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
     67        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
     68 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
     69 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
     70        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
     71 
     72 typedef union {
     73 	int i;
     74 	unsigned int ui;
     75 	float f;
     76 	const void *v;
     77 } Arg;
     78 
     79 typedef struct {
     80 	unsigned int click;
     81 	unsigned int mask;
     82 	unsigned int button;
     83 	void (*func)(const Arg *arg);
     84 	const Arg arg;
     85 } Button;
     86 
     87 typedef struct Monitor Monitor;
     88 typedef struct Client Client;
     89 struct Client {
     90 	char name[256];
     91 	float mina, maxa;
     92 	int x, y, w, h;
     93 	int oldx, oldy, oldw, oldh;
     94 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
     95 	int bw, oldbw;
     96 	unsigned int tags;
     97 	int isfixed, iscentered, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
     98 	pid_t pid;
     99 	Client *next;
    100 	Client *snext;
    101 	Client *swallowing;
    102 	Monitor *mon;
    103 	Window win;
    104 };
    105 
    106 typedef struct {
    107 	unsigned int mod;
    108 	KeySym keysym;
    109 	void (*func)(const Arg *);
    110 	const Arg arg;
    111 } Key;
    112 
    113 typedef struct {
    114 	const char *symbol;
    115 	void (*arrange)(Monitor *);
    116 } Layout;
    117 
    118 struct Monitor {
    119 	char ltsymbol[16];
    120 	float mfact;
    121 	int nmaster;
    122 	int num;
    123 	int by;               /* bar geometry */
    124 	int mx, my, mw, mh;   /* screen size */
    125 	int wx, wy, ww, wh;   /* window area  */
    126 	unsigned int seltags;
    127 	unsigned int sellt;
    128 	unsigned int tagset[2];
    129 	int showbar;
    130 	int topbar;
    131 	Client *clients;
    132 	Client *sel;
    133 	Client *stack;
    134 	Monitor *next;
    135 	Window barwin;
    136 	const Layout *lt[2];
    137 };
    138 
    139 typedef struct {
    140 	const char *class;
    141 	const char *instance;
    142 	const char *title;
    143 	unsigned int tags;
    144 	int iscentered;
    145 	int isfloating;
    146 	int isterminal;
    147 	int noswallow;
    148 	int monitor;
    149 } Rule;
    150 
    151 /* function declarations */
    152 static void applyrules(Client *c);
    153 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
    154 static void arrange(Monitor *m);
    155 static void arrangemon(Monitor *m);
    156 static void attach(Client *c);
    157 static void attachstack(Client *c);
    158 static void buttonpress(XEvent *e);
    159 static void checkotherwm(void);
    160 static void cleanup(void);
    161 static void cleanupmon(Monitor *mon);
    162 static void clientmessage(XEvent *e);
    163 static void configure(Client *c);
    164 static void configurenotify(XEvent *e);
    165 static void configurerequest(XEvent *e);
    166 static Monitor *createmon(void);
    167 static void destroynotify(XEvent *e);
    168 static void detach(Client *c);
    169 static void detachstack(Client *c);
    170 static Monitor *dirtomon(int dir);
    171 static void drawbar(Monitor *m);
    172 static void drawbars(void);
    173 static void enternotify(XEvent *e);
    174 static void expose(XEvent *e);
    175 static void focus(Client *c);
    176 static void focusin(XEvent *e);
    177 static void focusmon(const Arg *arg);
    178 static void focusstack(const Arg *arg);
    179 static Atom getatomprop(Client *c, Atom prop);
    180 static pid_t getparentprocess(pid_t p);
    181 static int getrootptr(int *x, int *y);
    182 static long getstate(Window w);
    183 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
    184 static void grabbuttons(Client *c, int focused);
    185 static void grabkeys(void);
    186 static void incnmaster(const Arg *arg);
    187 static int isdescprocess(pid_t p, pid_t c);
    188 static void keypress(XEvent *e);
    189 static void killclient(const Arg *arg);
    190 static void manage(Window w, XWindowAttributes *wa);
    191 static void mappingnotify(XEvent *e);
    192 static void maprequest(XEvent *e);
    193 static void monocle(Monitor *m);
    194 static void motionnotify(XEvent *e);
    195 static void movemouse(const Arg *arg);
    196 static Client *nexttiled(Client *c);
    197 static void pop(Client *);
    198 static void propertynotify(XEvent *e);
    199 static void quit(const Arg *arg);
    200 static Monitor *recttomon(int x, int y, int w, int h);
    201 static void resize(Client *c, int x, int y, int w, int h, int interact);
    202 static void resizeclient(Client *c, int x, int y, int w, int h);
    203 static void resizemouse(const Arg *arg);
    204 static void restack(Monitor *m);
    205 static void run(void);
    206 static void scan(void);
    207 static int sendevent(Client *c, Atom proto);
    208 static void sendmon(Client *c, Monitor *m);
    209 static void setclientstate(Client *c, long state);
    210 static void setfocus(Client *c);
    211 static void setfullscreen(Client *c, int fullscreen);
    212 static void setlayout(const Arg *arg);
    213 static void setmfact(const Arg *arg);
    214 static void setup(void);
    215 static void seturgent(Client *c, int urg);
    216 static void showhide(Client *c);
    217 static void sigchld(int unused);
    218 static void spawn(const Arg *arg);
    219 static Client *swallowingclient(Window w);
    220 static void tag(const Arg *arg);
    221 static void tagmon(const Arg *arg);
    222 static Client *termforwin(const Client *c);
    223 static void tile(Monitor *);
    224 static void togglebar(const Arg *arg);
    225 static void togglefloating(const Arg *arg);
    226 static void toggletag(const Arg *arg);
    227 static void toggleview(const Arg *arg);
    228 static void unfocus(Client *c, int setfocus);
    229 static void unmanage(Client *c, int destroyed);
    230 static void unmapnotify(XEvent *e);
    231 static void updatebarpos(Monitor *m);
    232 static void updatebars(void);
    233 static void updateclientlist(void);
    234 static int updategeom(void);
    235 static void updatenumlockmask(void);
    236 static void updatesizehints(Client *c);
    237 static void updatestatus(void);
    238 static void updatetitle(Client *c);
    239 static void updatewindowtype(Client *c);
    240 static void updatewmhints(Client *c);
    241 static pid_t winpid(Window w);
    242 static void view(const Arg *arg);
    243 static Client *wintoclient(Window w);
    244 static Monitor *wintomon(Window w);
    245 static int xerror(Display *dpy, XErrorEvent *ee);
    246 static int xerrordummy(Display *dpy, XErrorEvent *ee);
    247 static int xerrorstart(Display *dpy, XErrorEvent *ee);
    248 static void zoom(const Arg *arg);
    249 
    250 /* variables */
    251 static const char broken[] = "broken";
    252 static char stext[256];
    253 static int screen;
    254 static int sw, sh;           /* X display screen geometry width, height */
    255 static int bh, blw = 0;      /* bar geometry */
    256 static int lrpad;            /* sum of left and right padding for text */
    257 static int (*xerrorxlib)(Display *, XErrorEvent *);
    258 static unsigned int numlockmask = 0;
    259 static void (*handler[LASTEvent]) (XEvent *) = {
    260 	[ButtonPress] = buttonpress,
    261 	[ClientMessage] = clientmessage,
    262 	[ConfigureRequest] = configurerequest,
    263 	[ConfigureNotify] = configurenotify,
    264 	[DestroyNotify] = destroynotify,
    265 	[EnterNotify] = enternotify,
    266 	[Expose] = expose,
    267 	[FocusIn] = focusin,
    268 	[KeyPress] = keypress,
    269 	[MappingNotify] = mappingnotify,
    270 	[MapRequest] = maprequest,
    271 	[MotionNotify] = motionnotify,
    272 	[PropertyNotify] = propertynotify,
    273 	[UnmapNotify] = unmapnotify
    274 };
    275 static Atom wmatom[WMLast], netatom[NetLast];
    276 static int running = 1;
    277 static Cur *cursor[CurLast];
    278 static Clr **scheme;
    279 static Display *dpy;
    280 static Drw *drw;
    281 static Monitor *mons, *selmon;
    282 static Window root, wmcheckwin;
    283 
    284 static xcb_connection_t *xcon;
    285 
    286 /* configuration, allows nested code to access above variables */
    287 #include "config.h"
    288 
    289 /* compile-time check if all tags fit into an unsigned int bit array. */
    290 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
    291 
    292 /* function implementations */
    293 void
    294 applyrules(Client *c)
    295 {
    296 	const char *class, *instance;
    297 	unsigned int i;
    298 	const Rule *r;
    299 	Monitor *m;
    300 	XClassHint ch = { NULL, NULL };
    301 
    302 	/* rule matching */
    303 	c->isfloating = 0;
    304 	c->tags = 0;
    305 	XGetClassHint(dpy, c->win, &ch);
    306 	class    = ch.res_class ? ch.res_class : broken;
    307 	instance = ch.res_name  ? ch.res_name  : broken;
    308 
    309 	for (i = 0; i < LENGTH(rules); i++) {
    310 		r = &rules[i];
    311 		if ((!r->title || strstr(c->name, r->title))
    312 		&& (!r->class || strstr(class, r->class))
    313 		&& (!r->instance || strstr(instance, r->instance)))
    314 		{
    315 			c->isterminal = r->isterminal;
    316 			c->iscentered = r->iscentered;
    317 			c->isfloating = r->isfloating;
    318 			c->tags |= r->tags;
    319 			for (m = mons; m && m->num != r->monitor; m = m->next);
    320 			if (m)
    321 				c->mon = m;
    322 		}
    323 	}
    324 	if (ch.res_class)
    325 		XFree(ch.res_class);
    326 	if (ch.res_name)
    327 		XFree(ch.res_name);
    328 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
    329 }
    330 
    331 int
    332 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
    333 {
    334 	int baseismin;
    335 	Monitor *m = c->mon;
    336 
    337 	/* set minimum possible */
    338 	*w = MAX(1, *w);
    339 	*h = MAX(1, *h);
    340 	if (interact) {
    341 		if (*x > sw)
    342 			*x = sw - WIDTH(c);
    343 		if (*y > sh)
    344 			*y = sh - HEIGHT(c);
    345 		if (*x + *w + 2 * c->bw < 0)
    346 			*x = 0;
    347 		if (*y + *h + 2 * c->bw < 0)
    348 			*y = 0;
    349 	} else {
    350 		if (*x >= m->wx + m->ww)
    351 			*x = m->wx + m->ww - WIDTH(c);
    352 		if (*y >= m->wy + m->wh)
    353 			*y = m->wy + m->wh - HEIGHT(c);
    354 		if (*x + *w + 2 * c->bw <= m->wx)
    355 			*x = m->wx;
    356 		if (*y + *h + 2 * c->bw <= m->wy)
    357 			*y = m->wy;
    358 	}
    359 	if (*h < bh)
    360 		*h = bh;
    361 	if (*w < bh)
    362 		*w = bh;
    363 	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
    364 		/* see last two sentences in ICCCM 4.1.2.3 */
    365 		baseismin = c->basew == c->minw && c->baseh == c->minh;
    366 		if (!baseismin) { /* temporarily remove base dimensions */
    367 			*w -= c->basew;
    368 			*h -= c->baseh;
    369 		}
    370 		/* adjust for aspect limits */
    371 		if (c->mina > 0 && c->maxa > 0) {
    372 			if (c->maxa < (float)*w / *h)
    373 				*w = *h * c->maxa + 0.5;
    374 			else if (c->mina < (float)*h / *w)
    375 				*h = *w * c->mina + 0.5;
    376 		}
    377 		if (baseismin) { /* increment calculation requires this */
    378 			*w -= c->basew;
    379 			*h -= c->baseh;
    380 		}
    381 		/* adjust for increment value */
    382 		if (c->incw)
    383 			*w -= *w % c->incw;
    384 		if (c->inch)
    385 			*h -= *h % c->inch;
    386 		/* restore base dimensions */
    387 		*w = MAX(*w + c->basew, c->minw);
    388 		*h = MAX(*h + c->baseh, c->minh);
    389 		if (c->maxw)
    390 			*w = MIN(*w, c->maxw);
    391 		if (c->maxh)
    392 			*h = MIN(*h, c->maxh);
    393 	}
    394 	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
    395 }
    396 
    397 void
    398 arrange(Monitor *m)
    399 {
    400 	if (m)
    401 		showhide(m->stack);
    402 	else for (m = mons; m; m = m->next)
    403 		showhide(m->stack);
    404 	if (m) {
    405 		arrangemon(m);
    406 		restack(m);
    407 	} else for (m = mons; m; m = m->next)
    408 		arrangemon(m);
    409 }
    410 
    411 void
    412 arrangemon(Monitor *m)
    413 {
    414 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
    415 	if (m->lt[m->sellt]->arrange)
    416 		m->lt[m->sellt]->arrange(m);
    417 }
    418 
    419 void
    420 attach(Client *c)
    421 {
    422 	c->next = c->mon->clients;
    423 	c->mon->clients = c;
    424 }
    425 
    426 void
    427 attachstack(Client *c)
    428 {
    429 	c->snext = c->mon->stack;
    430 	c->mon->stack = c;
    431 }
    432 
    433 void
    434 swallow(Client *p, Client *c)
    435 {
    436 	if (c->noswallow || c->isterminal)
    437 		return;
    438 
    439 	detach(c);
    440 	detachstack(c);
    441 
    442 	setclientstate(c, WithdrawnState);
    443 	XUnmapWindow(dpy, p->win);
    444 
    445 	p->swallowing = c;
    446 	c->mon = p->mon;
    447 	
    448 	Window w = p->win;
    449 	p->win = c->win;
    450 	c->win = w;
    451 	updatetitle(p);
    452 	arrange(p->mon);
    453 	XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
    454 	configure(p);
    455 	updateclientlist();
    456 }
    457 		
    458 void
    459 unswallow(Client *c)
    460 {
    461 	c->win = c->swallowing->win;
    462 
    463 	free(c->swallowing);
    464 	c->swallowing = NULL;
    465 		
    466 	updatetitle(c);
    467 	arrange(c->mon);
    468 	XMapWindow(dpy, c->win);
    469 	XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    470 	configure(c);
    471 	setclientstate(c, NormalState);
    472 	focus(c);
    473 }
    474 
    475 void
    476 buttonpress(XEvent *e)
    477 {
    478 	unsigned int i, x, click;
    479 	Arg arg = {0};
    480 	Client *c;
    481 	Monitor *m;
    482 	XButtonPressedEvent *ev = &e->xbutton;
    483 
    484 	click = ClkRootWin;
    485 	/* focus monitor if necessary */
    486 	if ((m = wintomon(ev->window)) && m != selmon) {
    487 		unfocus(selmon->sel, 1);
    488 		selmon = m;
    489 		focus(NULL);
    490 	}
    491 	if (ev->window == selmon->barwin) {
    492 		i = x = 0;
    493 		do
    494 			x += TEXTW(tags[i]);
    495 		while (ev->x >= x && ++i < LENGTH(tags));
    496 		if (i < LENGTH(tags)) {
    497 			click = ClkTagBar;
    498 			arg.ui = 1 << i;
    499 		} else if (ev->x < x + blw)
    500 			click = ClkLtSymbol;
    501 		else if (ev->x > selmon->ww - (int)TEXTW(stext))
    502 			click = ClkStatusText;
    503 		else
    504 			click = ClkWinTitle;
    505 	} else if ((c = wintoclient(ev->window))) {
    506 		focus(c);
    507 		restack(selmon);
    508 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
    509 		click = ClkClientWin;
    510 	}
    511 	for (i = 0; i < LENGTH(buttons); i++)
    512 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
    513 		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
    514 			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
    515 }
    516 
    517 void
    518 checkotherwm(void)
    519 {
    520 	xerrorxlib = XSetErrorHandler(xerrorstart);
    521 	/* this causes an error if some other window manager is running */
    522 	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
    523 	XSync(dpy, False);
    524 	XSetErrorHandler(xerror);
    525 	XSync(dpy, False);
    526 }
    527 
    528 void
    529 cleanup(void)
    530 {
    531 	Arg a = {.ui = ~0};
    532 	Layout foo = { "", NULL };
    533 	Monitor *m;
    534 	size_t i;
    535 
    536 	view(&a);
    537 	selmon->lt[selmon->sellt] = &foo;
    538 	for (m = mons; m; m = m->next)
    539 		while (m->stack)
    540 			unmanage(m->stack, 0); // XXX - unmanage swallowing windows too
    541 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
    542 	while (mons)
    543 		cleanupmon(mons);
    544 	for (i = 0; i < CurLast; i++)
    545 		drw_cur_free(drw, cursor[i]);
    546 	for (i = 0; i < LENGTH(colors); i++)
    547 		free(scheme[i]);
    548 	XDestroyWindow(dpy, wmcheckwin);
    549 	drw_free(drw);
    550 	XSync(dpy, False);
    551 	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
    552 	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    553 }
    554 
    555 void
    556 cleanupmon(Monitor *mon)
    557 {
    558 	Monitor *m;
    559 
    560 	if (mon == mons)
    561 		mons = mons->next;
    562 	else {
    563 		for (m = mons; m && m->next != mon; m = m->next);
    564 		m->next = mon->next;
    565 	}
    566 	XUnmapWindow(dpy, mon->barwin);
    567 	XDestroyWindow(dpy, mon->barwin);
    568 	free(mon);
    569 }
    570 
    571 void
    572 clientmessage(XEvent *e)
    573 {
    574 	XClientMessageEvent *cme = &e->xclient;
    575 	Client *c = wintoclient(cme->window);
    576 
    577 	if (!c)
    578 		return;
    579 	if (cme->message_type == netatom[NetWMState]) {
    580 		if (cme->data.l[1] == netatom[NetWMFullscreen]
    581 		|| cme->data.l[2] == netatom[NetWMFullscreen])
    582 			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
    583 				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
    584 	} else if (cme->message_type == netatom[NetActiveWindow]) {
    585 		if (c != selmon->sel && !c->isurgent)
    586 			seturgent(c, 1);
    587 	}
    588 }
    589 
    590 void
    591 configure(Client *c)
    592 {
    593 	XConfigureEvent ce;
    594 
    595 	ce.type = ConfigureNotify;
    596 	ce.display = dpy;
    597 	ce.event = c->win;
    598 	ce.window = c->win;
    599 	ce.x = c->x;
    600 	ce.y = c->y;
    601 	ce.width = c->w;
    602 	ce.height = c->h;
    603 	ce.border_width = c->bw;
    604 	ce.above = None;
    605 	ce.override_redirect = False;
    606 	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
    607 }
    608 
    609 void
    610 configurenotify(XEvent *e)
    611 {
    612 	Monitor *m;
    613 	Client *c;
    614 	XConfigureEvent *ev = &e->xconfigure;
    615 	int dirty;
    616 
    617 	/* TODO: updategeom handling sucks, needs to be simplified */
    618 	if (ev->window == root) {
    619 		dirty = (sw != ev->width || sh != ev->height);
    620 		sw = ev->width;
    621 		sh = ev->height;
    622 		if (updategeom() || dirty) {
    623 			drw_resize(drw, sw, bh);
    624 			updatebars();
    625 			for (m = mons; m; m = m->next) {
    626 				for (c = m->clients; c; c = c->next)
    627 					if (c->isfullscreen)
    628 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
    629 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
    630 			}
    631 			focus(NULL);
    632 			arrange(NULL);
    633 		}
    634 	}
    635 }
    636 
    637 void
    638 configurerequest(XEvent *e)
    639 {
    640 	Client *c;
    641 	Monitor *m;
    642 	XConfigureRequestEvent *ev = &e->xconfigurerequest;
    643 	XWindowChanges wc;
    644 
    645 	if ((c = wintoclient(ev->window))) {
    646 		if (ev->value_mask & CWBorderWidth)
    647 			c->bw = ev->border_width;
    648 		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
    649 			m = c->mon;
    650 			if (ev->value_mask & CWX) {
    651 				c->oldx = c->x;
    652 				c->x = m->mx + ev->x;
    653 			}
    654 			if (ev->value_mask & CWY) {
    655 				c->oldy = c->y;
    656 				c->y = m->my + ev->y;
    657 			}
    658 			if (ev->value_mask & CWWidth) {
    659 				c->oldw = c->w;
    660 				c->w = ev->width;
    661 			}
    662 			if (ev->value_mask & CWHeight) {
    663 				c->oldh = c->h;
    664 				c->h = ev->height;
    665 			}
    666 			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
    667 				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
    668 			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
    669 				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
    670 			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
    671 				configure(c);
    672 			if (ISVISIBLE(c))
    673 				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    674 		} else
    675 			configure(c);
    676 	} else {
    677 		wc.x = ev->x;
    678 		wc.y = ev->y;
    679 		wc.width = ev->width;
    680 		wc.height = ev->height;
    681 		wc.border_width = ev->border_width;
    682 		wc.sibling = ev->above;
    683 		wc.stack_mode = ev->detail;
    684 		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
    685 	}
    686 	XSync(dpy, False);
    687 }
    688 
    689 Monitor *
    690 createmon(void)
    691 {
    692 	Monitor *m;
    693 
    694 	m = ecalloc(1, sizeof(Monitor));
    695 	m->tagset[0] = m->tagset[1] = 1;
    696 	m->mfact = mfact;
    697 	m->nmaster = nmaster;
    698 	m->showbar = showbar;
    699 	m->topbar = topbar;
    700 	m->lt[0] = &layouts[0];
    701 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
    702 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
    703 	return m;
    704 }
    705 
    706 void
    707 destroynotify(XEvent *e)
    708 {
    709 	Client *c;
    710 	XDestroyWindowEvent *ev = &e->xdestroywindow;
    711 
    712 	if ((c = wintoclient(ev->window)))
    713 		unmanage(c, 1);
    714 
    715 	else if ((c = swallowingclient(ev->window)))
    716 		unmanage(c->swallowing, 1);
    717 }
    718 
    719 void
    720 detach(Client *c)
    721 {
    722 	Client **tc;
    723 
    724 	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
    725 	*tc = c->next;
    726 }
    727 
    728 void
    729 detachstack(Client *c)
    730 {
    731 	Client **tc, *t;
    732 
    733 	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
    734 	*tc = c->snext;
    735 
    736 	if (c == c->mon->sel) {
    737 		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
    738 		c->mon->sel = t;
    739 	}
    740 }
    741 
    742 Monitor *
    743 dirtomon(int dir)
    744 {
    745 	Monitor *m = NULL;
    746 
    747 	if (dir > 0) {
    748 		if (!(m = selmon->next))
    749 			m = mons;
    750 	} else if (selmon == mons)
    751 		for (m = mons; m->next; m = m->next);
    752 	else
    753 		for (m = mons; m->next != selmon; m = m->next);
    754 	return m;
    755 }
    756 
    757 void
    758 drawbar(Monitor *m)
    759 {
    760 	int x, w, tw = 0;
    761 	int boxs = drw->fonts->h / 9;
    762 	int boxw = drw->fonts->h / 6 + 2;
    763 	unsigned int i, occ = 0, urg = 0;
    764 	Client *c;
    765 
    766 	/* draw status first so it can be overdrawn by tags later */
    767 	if (m == selmon) { /* status is only drawn on selected monitor */
    768 		drw_setscheme(drw, scheme[SchemeNorm]);
    769 		tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
    770 		drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
    771 	}
    772 
    773 	for (c = m->clients; c; c = c->next) {
    774 		occ |= c->tags;
    775 		if (c->isurgent)
    776 			urg |= c->tags;
    777 	}
    778 	x = 0;
    779 	for (i = 0; i < LENGTH(tags); i++) {
    780 		w = TEXTW(tags[i]);
    781 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
    782 		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
    783 		if (occ & 1 << i)
    784 			drw_rect(drw, x + boxs, boxs, boxw, boxw,
    785 				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
    786 				urg & 1 << i);
    787 		x += w;
    788 	}
    789 	w = blw = TEXTW(m->ltsymbol);
    790 	drw_setscheme(drw, scheme[SchemeNorm]);
    791 	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
    792 
    793 	if ((w = m->ww - tw - x) > bh) {
    794 		if (m->sel) {
    795 			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
    796 			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
    797 			if (m->sel->isfloating)
    798 				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
    799 		} else {
    800 			drw_setscheme(drw, scheme[SchemeNorm]);
    801 			drw_rect(drw, x, 0, w, bh, 1, 1);
    802 		}
    803 	}
    804 	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
    805 }
    806 
    807 void
    808 drawbars(void)
    809 {
    810 	Monitor *m;
    811 
    812 	for (m = mons; m; m = m->next)
    813 		drawbar(m);
    814 }
    815 
    816 void
    817 enternotify(XEvent *e)
    818 {
    819 	Client *c;
    820 	Monitor *m;
    821 	XCrossingEvent *ev = &e->xcrossing;
    822 
    823 	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
    824 		return;
    825 	c = wintoclient(ev->window);
    826 	m = c ? c->mon : wintomon(ev->window);
    827 	if (m != selmon) {
    828 		unfocus(selmon->sel, 1);
    829 		selmon = m;
    830 	} else if (!c || c == selmon->sel)
    831 		return;
    832 	focus(c);
    833 }
    834 
    835 void
    836 expose(XEvent *e)
    837 {
    838 	Monitor *m;
    839 	XExposeEvent *ev = &e->xexpose;
    840 
    841 	if (ev->count == 0 && (m = wintomon(ev->window)))
    842 		drawbar(m);
    843 }
    844 
    845 void
    846 focus(Client *c)
    847 {
    848 	if (!c || !ISVISIBLE(c))
    849 		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
    850 	if (selmon->sel && selmon->sel != c)
    851 		unfocus(selmon->sel, 0);
    852 	if (c) {
    853 		if (c->mon != selmon)
    854 			selmon = c->mon;
    855 		if (c->isurgent)
    856 			seturgent(c, 0);
    857 		detachstack(c);
    858 		attachstack(c);
    859 		grabbuttons(c, 1);
    860 		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
    861 		setfocus(c);
    862 	} else {
    863 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
    864 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    865 	}
    866 	selmon->sel = c;
    867 	drawbars();
    868 }
    869 
    870 /* there are some broken focus acquiring clients needing extra handling */
    871 void
    872 focusin(XEvent *e)
    873 {
    874 	XFocusChangeEvent *ev = &e->xfocus;
    875 
    876 	if (selmon->sel && ev->window != selmon->sel->win)
    877 		setfocus(selmon->sel);
    878 }
    879 
    880 void
    881 focusmon(const Arg *arg)
    882 {
    883 	Monitor *m;
    884 
    885 	if (!mons->next)
    886 		return;
    887 	if ((m = dirtomon(arg->i)) == selmon)
    888 		return;
    889 	unfocus(selmon->sel, 0);
    890 	selmon = m;
    891 	focus(NULL);
    892 }
    893 
    894 void
    895 focusstack(const Arg *arg)
    896 {
    897 	Client *c = NULL, *i;
    898 
    899 	if (!selmon->sel)
    900 		return;
    901 	if (arg->i > 0) {
    902 		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
    903 		if (!c)
    904 			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
    905 	} else {
    906 		for (i = selmon->clients; i != selmon->sel; i = i->next)
    907 			if (ISVISIBLE(i))
    908 				c = i;
    909 		if (!c)
    910 			for (; i; i = i->next)
    911 				if (ISVISIBLE(i))
    912 					c = i;
    913 	}
    914 	if (c) {
    915 		focus(c);
    916 		restack(selmon);
    917 	}
    918 }
    919 
    920 Atom
    921 getatomprop(Client *c, Atom prop)
    922 {
    923 	int di;
    924 	unsigned long dl;
    925 	unsigned char *p = NULL;
    926 	Atom da, atom = None;
    927 
    928 	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
    929 		&da, &di, &dl, &dl, &p) == Success && p) {
    930 		atom = *(Atom *)p;
    931 		XFree(p);
    932 	}
    933 	return atom;
    934 }
    935 
    936 int
    937 getrootptr(int *x, int *y)
    938 {
    939 	int di;
    940 	unsigned int dui;
    941 	Window dummy;
    942 
    943 	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
    944 }
    945 
    946 long
    947 getstate(Window w)
    948 {
    949 	int format;
    950 	long result = -1;
    951 	unsigned char *p = NULL;
    952 	unsigned long n, extra;
    953 	Atom real;
    954 
    955 	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
    956 		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
    957 		return -1;
    958 	if (n != 0)
    959 		result = *p;
    960 	XFree(p);
    961 	return result;
    962 }
    963 
    964 int
    965 gettextprop(Window w, Atom atom, char *text, unsigned int size)
    966 {
    967 	char **list = NULL;
    968 	int n;
    969 	XTextProperty name;
    970 
    971 	if (!text || size == 0)
    972 		return 0;
    973 	text[0] = '\0';
    974 	if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
    975 		return 0;
    976 	if (name.encoding == XA_STRING)
    977 		strncpy(text, (char *)name.value, size - 1);
    978 	else {
    979 		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
    980 			strncpy(text, *list, size - 1);
    981 			XFreeStringList(list);
    982 		}
    983 	}
    984 	text[size - 1] = '\0';
    985 	XFree(name.value);
    986 	return 1;
    987 }
    988 
    989 void
    990 grabbuttons(Client *c, int focused)
    991 {
    992 	updatenumlockmask();
    993 	{
    994 		unsigned int i, j;
    995 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
    996 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
    997 		if (!focused)
    998 			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
    999 				BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
   1000 		for (i = 0; i < LENGTH(buttons); i++)
   1001 			if (buttons[i].click == ClkClientWin)
   1002 				for (j = 0; j < LENGTH(modifiers); j++)
   1003 					XGrabButton(dpy, buttons[i].button,
   1004 						buttons[i].mask | modifiers[j],
   1005 						c->win, False, BUTTONMASK,
   1006 						GrabModeAsync, GrabModeSync, None, None);
   1007 	}
   1008 }
   1009 
   1010 void
   1011 grabkeys(void)
   1012 {
   1013 	updatenumlockmask();
   1014 	{
   1015 		unsigned int i, j;
   1016 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
   1017 		KeyCode code;
   1018 
   1019 		XUngrabKey(dpy, AnyKey, AnyModifier, root);
   1020 		for (i = 0; i < LENGTH(keys); i++)
   1021 			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
   1022 				for (j = 0; j < LENGTH(modifiers); j++)
   1023 					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
   1024 						True, GrabModeAsync, GrabModeAsync);
   1025 	}
   1026 }
   1027 
   1028 void
   1029 incnmaster(const Arg *arg)
   1030 {
   1031 	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
   1032 	arrange(selmon);
   1033 }
   1034 
   1035 #ifdef XINERAMA
   1036 static int
   1037 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
   1038 {
   1039 	while (n--)
   1040 		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
   1041 		&& unique[n].width == info->width && unique[n].height == info->height)
   1042 			return 0;
   1043 	return 1;
   1044 }
   1045 #endif /* XINERAMA */
   1046 
   1047 void
   1048 keypress(XEvent *e)
   1049 {
   1050 	unsigned int i;
   1051 	KeySym keysym;
   1052 	XKeyEvent *ev;
   1053 
   1054 	ev = &e->xkey;
   1055 	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
   1056 	for (i = 0; i < LENGTH(keys); i++)
   1057 		if (keysym == keys[i].keysym
   1058 		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
   1059 		&& keys[i].func)
   1060 			keys[i].func(&(keys[i].arg));
   1061 }
   1062 
   1063 void
   1064 killclient(const Arg *arg)
   1065 {
   1066 	if (!selmon->sel)
   1067 		return;
   1068 	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
   1069 		XGrabServer(dpy);
   1070 		XSetErrorHandler(xerrordummy);
   1071 		XSetCloseDownMode(dpy, DestroyAll);
   1072 		XKillClient(dpy, selmon->sel->win);
   1073 		XSync(dpy, False);
   1074 		XSetErrorHandler(xerror);
   1075 		XUngrabServer(dpy);
   1076 	}
   1077 }
   1078 
   1079 void
   1080 manage(Window w, XWindowAttributes *wa)
   1081 {
   1082 	Client *c, *t, *term = NULL;
   1083 	Window trans = None;
   1084 	XWindowChanges wc;
   1085 
   1086 	c = ecalloc(1, sizeof(Client));
   1087 	c->win = w;
   1088 	c->pid = winpid(w);
   1089 	/* geometry */
   1090 	c->x = c->oldx = wa->x;
   1091 	c->y = c->oldy = wa->y;
   1092 	c->w = c->oldw = wa->width;
   1093 	c->h = c->oldh = wa->height;
   1094 	c->oldbw = wa->border_width;
   1095 
   1096 	updatetitle(c);
   1097 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
   1098 		c->mon = t->mon;
   1099 		c->tags = t->tags;
   1100 	} else {
   1101 		c->mon = selmon;
   1102 		applyrules(c);
   1103 		term = termforwin(c);
   1104 	}
   1105 
   1106 	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
   1107 		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
   1108 	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
   1109 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
   1110 	c->x = MAX(c->x, c->mon->mx);
   1111 	/* only fix client y-offset, if the client center might cover the bar */
   1112 	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
   1113 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
   1114 	c->bw = borderpx;
   1115 
   1116 	if(c->iscentered) {
   1117 		c->x = (c->mon->mw - WIDTH(c)) / 2;
   1118 		c->y = (c->mon->mh - HEIGHT(c)) / 2;
   1119 	}
   1120 
   1121 	wc.border_width = c->bw;
   1122 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
   1123 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
   1124 	configure(c); /* propagates border_width, if size doesn't change */
   1125 	updatewindowtype(c);
   1126 	updatesizehints(c);
   1127 	updatewmhints(c);
   1128 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
   1129 	grabbuttons(c, 0);
   1130 	if (!c->isfloating)
   1131 		c->isfloating = c->oldstate = trans != None || c->isfixed;
   1132 	if (c->isfloating)
   1133 		XRaiseWindow(dpy, c->win);
   1134 	attach(c);
   1135 	attachstack(c);
   1136 	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
   1137 		(unsigned char *) &(c->win), 1);
   1138 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
   1139 	setclientstate(c, NormalState);
   1140 	if (c->mon == selmon)
   1141 		unfocus(selmon->sel, 0);
   1142 	c->mon->sel = c;
   1143 	if (!term)
   1144 		arrange(c->mon);
   1145 	XMapWindow(dpy, c->win);
   1146 	if (term)
   1147 		swallow(term, c);
   1148 	focus(NULL);
   1149 }
   1150 
   1151 void
   1152 mappingnotify(XEvent *e)
   1153 {
   1154 	XMappingEvent *ev = &e->xmapping;
   1155 
   1156 	XRefreshKeyboardMapping(ev);
   1157 	if (ev->request == MappingKeyboard)
   1158 		grabkeys();
   1159 }
   1160 
   1161 void
   1162 maprequest(XEvent *e)
   1163 {
   1164 	static XWindowAttributes wa;
   1165 	XMapRequestEvent *ev = &e->xmaprequest;
   1166 
   1167 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
   1168 		return;
   1169 	if (wa.override_redirect)
   1170 		return;
   1171 	if (!wintoclient(ev->window))
   1172 		manage(ev->window, &wa);
   1173 }
   1174 
   1175 void
   1176 monocle(Monitor *m)
   1177 {
   1178 	unsigned int n = 0;
   1179 	Client *c;
   1180 
   1181 	for (c = m->clients; c; c = c->next)
   1182 		if (ISVISIBLE(c))
   1183 			n++;
   1184 	if (n > 0) /* override layout symbol */
   1185 		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
   1186 	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
   1187 		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
   1188 }
   1189 
   1190 void
   1191 motionnotify(XEvent *e)
   1192 {
   1193 	static Monitor *mon = NULL;
   1194 	Monitor *m;
   1195 	XMotionEvent *ev = &e->xmotion;
   1196 
   1197 	if (ev->window != root)
   1198 		return;
   1199 	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
   1200 		unfocus(selmon->sel, 1);
   1201 		selmon = m;
   1202 		focus(NULL);
   1203 	}
   1204 	mon = m;
   1205 }
   1206 
   1207 void
   1208 movemouse(const Arg *arg)
   1209 {
   1210 	int x, y, ocx, ocy, nx, ny;
   1211 	Client *c;
   1212 	Monitor *m;
   1213 	XEvent ev;
   1214 	Time lasttime = 0;
   1215 
   1216 	if (!(c = selmon->sel))
   1217 		return;
   1218 	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
   1219 		return;
   1220 	restack(selmon);
   1221 	ocx = c->x;
   1222 	ocy = c->y;
   1223 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1224 		None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
   1225 		return;
   1226 	if (!getrootptr(&x, &y))
   1227 		return;
   1228 	do {
   1229 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1230 		switch(ev.type) {
   1231 		case ConfigureRequest:
   1232 		case Expose:
   1233 		case MapRequest:
   1234 			handler[ev.type](&ev);
   1235 			break;
   1236 		case MotionNotify:
   1237 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1238 				continue;
   1239 			lasttime = ev.xmotion.time;
   1240 
   1241 			nx = ocx + (ev.xmotion.x - x);
   1242 			ny = ocy + (ev.xmotion.y - y);
   1243 			if (abs(selmon->wx - nx) < snap)
   1244 				nx = selmon->wx;
   1245 			else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
   1246 				nx = selmon->wx + selmon->ww - WIDTH(c);
   1247 			if (abs(selmon->wy - ny) < snap)
   1248 				ny = selmon->wy;
   1249 			else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
   1250 				ny = selmon->wy + selmon->wh - HEIGHT(c);
   1251 			if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1252 			&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
   1253 				togglefloating(NULL);
   1254 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1255 				resize(c, nx, ny, c->w, c->h, 1);
   1256 			break;
   1257 		}
   1258 	} while (ev.type != ButtonRelease);
   1259 	XUngrabPointer(dpy, CurrentTime);
   1260 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1261 		sendmon(c, m);
   1262 		selmon = m;
   1263 		focus(NULL);
   1264 	}
   1265 }
   1266 
   1267 Client *
   1268 nexttiled(Client *c)
   1269 {
   1270 	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
   1271 	return c;
   1272 }
   1273 
   1274 void
   1275 pop(Client *c)
   1276 {
   1277 	detach(c);
   1278 	attach(c);
   1279 	focus(c);
   1280 	arrange(c->mon);
   1281 }
   1282 
   1283 void
   1284 propertynotify(XEvent *e)
   1285 {
   1286 	Client *c;
   1287 	Window trans;
   1288 	XPropertyEvent *ev = &e->xproperty;
   1289 
   1290 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
   1291 		updatestatus();
   1292 	else if (ev->state == PropertyDelete)
   1293 		return; /* ignore */
   1294 	else if ((c = wintoclient(ev->window))) {
   1295 		switch(ev->atom) {
   1296 		default: break;
   1297 		case XA_WM_TRANSIENT_FOR:
   1298 			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
   1299 				(c->isfloating = (wintoclient(trans)) != NULL))
   1300 				arrange(c->mon);
   1301 			break;
   1302 		case XA_WM_NORMAL_HINTS:
   1303 			updatesizehints(c);
   1304 			break;
   1305 		case XA_WM_HINTS:
   1306 			updatewmhints(c);
   1307 			drawbars();
   1308 			break;
   1309 		}
   1310 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
   1311 			updatetitle(c);
   1312 			if (c == c->mon->sel)
   1313 				drawbar(c->mon);
   1314 		}
   1315 		if (ev->atom == netatom[NetWMWindowType])
   1316 			updatewindowtype(c);
   1317 	}
   1318 }
   1319 
   1320 void
   1321 quit(const Arg *arg)
   1322 {
   1323 	running = 0;
   1324 }
   1325 
   1326 Monitor *
   1327 recttomon(int x, int y, int w, int h)
   1328 {
   1329 	Monitor *m, *r = selmon;
   1330 	int a, area = 0;
   1331 
   1332 	for (m = mons; m; m = m->next)
   1333 		if ((a = INTERSECT(x, y, w, h, m)) > area) {
   1334 			area = a;
   1335 			r = m;
   1336 		}
   1337 	return r;
   1338 }
   1339 
   1340 void
   1341 resize(Client *c, int x, int y, int w, int h, int interact)
   1342 {
   1343 	if (applysizehints(c, &x, &y, &w, &h, interact))
   1344 		resizeclient(c, x, y, w, h);
   1345 }
   1346 
   1347 void
   1348 resizeclient(Client *c, int x, int y, int w, int h)
   1349 {
   1350 	XWindowChanges wc;
   1351 	unsigned int n;
   1352 	unsigned int gapoffset;
   1353 	unsigned int gapincr;
   1354 	Client *nbc;
   1355 
   1356 	wc.border_width = c->bw;
   1357 
   1358 	/* Get number of clients for the selected monitor */
   1359 	for (n = 0, nbc = nexttiled(selmon->clients); nbc; nbc = nexttiled(nbc->next), n++);
   1360 
   1361 	/* Do nothing if layout is floating */
   1362 	if (c->isfloating || selmon->lt[selmon->sellt]->arrange == NULL) {
   1363 		gapincr = gapoffset = 0;
   1364 	} else {
   1365 		/* Remove border and gap if layout is monocole or only one client */
   1366 		if (selmon->lt[selmon->sellt]->arrange == monocle || n == 1) {
   1367 			gapoffset = 0;
   1368 			gapincr = -2 * borderpx;
   1369 			wc.border_width = 0;
   1370 		} else {
   1371 			gapoffset = gappx;
   1372 			gapincr = 2 * gappx;
   1373 		}
   1374 	}
   1375 
   1376 	c->oldx = c->x; c->x = wc.x = x + gapoffset;
   1377 	c->oldy = c->y; c->y = wc.y = y + gapoffset;
   1378 	c->oldw = c->w; c->w = wc.width = w - gapincr;
   1379 	c->oldh = c->h; c->h = wc.height = h - gapincr;
   1380 	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
   1381 	configure(c);
   1382 	XSync(dpy, False);
   1383 }
   1384 
   1385 void
   1386 resizemouse(const Arg *arg)
   1387 {
   1388 	int ocx, ocy, nw, nh;
   1389 	Client *c;
   1390 	Monitor *m;
   1391 	XEvent ev;
   1392 	Time lasttime = 0;
   1393 
   1394 	if (!(c = selmon->sel))
   1395 		return;
   1396 	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
   1397 		return;
   1398 	restack(selmon);
   1399 	ocx = c->x;
   1400 	ocy = c->y;
   1401 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1402 		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
   1403 		return;
   1404 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1405 	do {
   1406 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1407 		switch(ev.type) {
   1408 		case ConfigureRequest:
   1409 		case Expose:
   1410 		case MapRequest:
   1411 			handler[ev.type](&ev);
   1412 			break;
   1413 		case MotionNotify:
   1414 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1415 				continue;
   1416 			lasttime = ev.xmotion.time;
   1417 
   1418 			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
   1419 			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
   1420 			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
   1421 			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
   1422 			{
   1423 				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1424 				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
   1425 					togglefloating(NULL);
   1426 			}
   1427 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1428 				resize(c, c->x, c->y, nw, nh, 1);
   1429 			break;
   1430 		}
   1431 	} while (ev.type != ButtonRelease);
   1432 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1433 	XUngrabPointer(dpy, CurrentTime);
   1434 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1435 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1436 		sendmon(c, m);
   1437 		selmon = m;
   1438 		focus(NULL);
   1439 	}
   1440 }
   1441 
   1442 void
   1443 restack(Monitor *m)
   1444 {
   1445 	Client *c;
   1446 	XEvent ev;
   1447 	XWindowChanges wc;
   1448 
   1449 	drawbar(m);
   1450 	if (!m->sel)
   1451 		return;
   1452 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
   1453 		XRaiseWindow(dpy, m->sel->win);
   1454 	if (m->lt[m->sellt]->arrange) {
   1455 		wc.stack_mode = Below;
   1456 		wc.sibling = m->barwin;
   1457 		for (c = m->stack; c; c = c->snext)
   1458 			if (!c->isfloating && ISVISIBLE(c)) {
   1459 				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
   1460 				wc.sibling = c->win;
   1461 			}
   1462 	}
   1463 	XSync(dpy, False);
   1464 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1465 }
   1466 
   1467 void
   1468 run(void)
   1469 {
   1470 	XEvent ev;
   1471 	/* main event loop */
   1472 	XSync(dpy, False);
   1473 	while (running && !XNextEvent(dpy, &ev))
   1474 		if (handler[ev.type])
   1475 			handler[ev.type](&ev); /* call handler */
   1476 }
   1477 
   1478 void
   1479 scan(void)
   1480 {
   1481 	unsigned int i, num;
   1482 	Window d1, d2, *wins = NULL;
   1483 	XWindowAttributes wa;
   1484 
   1485 	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
   1486 		for (i = 0; i < num; i++) {
   1487 			if (!XGetWindowAttributes(dpy, wins[i], &wa)
   1488 			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
   1489 				continue;
   1490 			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
   1491 				manage(wins[i], &wa);
   1492 		}
   1493 		for (i = 0; i < num; i++) { /* now the transients */
   1494 			if (!XGetWindowAttributes(dpy, wins[i], &wa))
   1495 				continue;
   1496 			if (XGetTransientForHint(dpy, wins[i], &d1)
   1497 			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
   1498 				manage(wins[i], &wa);
   1499 		}
   1500 		if (wins)
   1501 			XFree(wins);
   1502 	}
   1503 }
   1504 
   1505 void
   1506 sendmon(Client *c, Monitor *m)
   1507 {
   1508 	if (c->mon == m)
   1509 		return;
   1510 	unfocus(c, 1);
   1511 	detach(c);
   1512 	detachstack(c);
   1513 	c->mon = m;
   1514 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
   1515 	attach(c);
   1516 	attachstack(c);
   1517 	focus(NULL);
   1518 	arrange(NULL);
   1519 }
   1520 
   1521 void
   1522 setclientstate(Client *c, long state)
   1523 {
   1524 	long data[] = { state, None };
   1525 
   1526 	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
   1527 		PropModeReplace, (unsigned char *)data, 2);
   1528 }
   1529 
   1530 int
   1531 sendevent(Client *c, Atom proto)
   1532 {
   1533 	int n;
   1534 	Atom *protocols;
   1535 	int exists = 0;
   1536 	XEvent ev;
   1537 
   1538 	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
   1539 		while (!exists && n--)
   1540 			exists = protocols[n] == proto;
   1541 		XFree(protocols);
   1542 	}
   1543 	if (exists) {
   1544 		ev.type = ClientMessage;
   1545 		ev.xclient.window = c->win;
   1546 		ev.xclient.message_type = wmatom[WMProtocols];
   1547 		ev.xclient.format = 32;
   1548 		ev.xclient.data.l[0] = proto;
   1549 		ev.xclient.data.l[1] = CurrentTime;
   1550 		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
   1551 	}
   1552 	return exists;
   1553 }
   1554 
   1555 void
   1556 setfocus(Client *c)
   1557 {
   1558 	if (!c->neverfocus) {
   1559 		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
   1560 		XChangeProperty(dpy, root, netatom[NetActiveWindow],
   1561 			XA_WINDOW, 32, PropModeReplace,
   1562 			(unsigned char *) &(c->win), 1);
   1563 	}
   1564 	sendevent(c, wmatom[WMTakeFocus]);
   1565 }
   1566 
   1567 void
   1568 setfullscreen(Client *c, int fullscreen)
   1569 {
   1570 	if (fullscreen && !c->isfullscreen) {
   1571 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1572 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
   1573 		c->isfullscreen = 1;
   1574 		c->oldstate = c->isfloating;
   1575 		c->oldbw = c->bw;
   1576 		c->bw = 0;
   1577 		c->isfloating = 1;
   1578 		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
   1579 		XRaiseWindow(dpy, c->win);
   1580 	} else if (!fullscreen && c->isfullscreen){
   1581 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1582 			PropModeReplace, (unsigned char*)0, 0);
   1583 		c->isfullscreen = 0;
   1584 		c->isfloating = c->oldstate;
   1585 		c->bw = c->oldbw;
   1586 		c->x = c->oldx;
   1587 		c->y = c->oldy;
   1588 		c->w = c->oldw;
   1589 		c->h = c->oldh;
   1590 		resizeclient(c, c->x, c->y, c->w, c->h);
   1591 		arrange(c->mon);
   1592 	}
   1593 }
   1594 
   1595 void
   1596 setlayout(const Arg *arg)
   1597 {
   1598 	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
   1599 		selmon->sellt ^= 1;
   1600 	if (arg && arg->v)
   1601 		selmon->lt[selmon->sellt] = (Layout *)arg->v;
   1602 	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
   1603 	if (selmon->sel)
   1604 		arrange(selmon);
   1605 	else
   1606 		drawbar(selmon);
   1607 }
   1608 
   1609 /* arg > 1.0 will set mfact absolutely */
   1610 void
   1611 setmfact(const Arg *arg)
   1612 {
   1613 	float f;
   1614 
   1615 	if (!arg || !selmon->lt[selmon->sellt]->arrange)
   1616 		return;
   1617 	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
   1618 	if (f < 0.05 || f > 0.95)
   1619 		return;
   1620 	selmon->mfact = f;
   1621 	arrange(selmon);
   1622 }
   1623 
   1624 void
   1625 setup(void)
   1626 {
   1627 	int i;
   1628 	XSetWindowAttributes wa;
   1629 	Atom utf8string;
   1630 
   1631 	/* clean up any zombies immediately */
   1632 	sigchld(0);
   1633 
   1634 	/* init screen */
   1635 	screen = DefaultScreen(dpy);
   1636 	sw = DisplayWidth(dpy, screen);
   1637 	sh = DisplayHeight(dpy, screen);
   1638 	root = RootWindow(dpy, screen);
   1639 	drw = drw_create(dpy, screen, root, sw, sh);
   1640 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
   1641 		die("no fonts could be loaded.");
   1642 	lrpad = drw->fonts->h;
   1643 	bh = drw->fonts->h + 2;
   1644 	updategeom();
   1645 
   1646 	/* init atoms */
   1647 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
   1648 	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
   1649 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
   1650 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
   1651 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
   1652 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
   1653 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
   1654 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
   1655 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
   1656 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
   1657 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
   1658 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
   1659 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
   1660 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
   1661 	/* init cursors */
   1662 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
   1663 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
   1664 	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
   1665 	/* init appearance */
   1666 	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
   1667 	for (i = 0; i < LENGTH(colors); i++)
   1668 		scheme[i] = drw_scm_create(drw, colors[i], 3);
   1669 	/* init bars */
   1670 	updatebars();
   1671 	updatestatus();
   1672 	/* supporting window for NetWMCheck */
   1673 	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
   1674 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
   1675 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1676 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
   1677 		PropModeReplace, (unsigned char *) "dwm", 3);
   1678 	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
   1679 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1680 	/* EWMH support per view */
   1681 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
   1682 		PropModeReplace, (unsigned char *) netatom, NetLast);
   1683 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1684 	/* select events */
   1685 	wa.cursor = cursor[CurNormal]->cursor;
   1686 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
   1687 		|ButtonPressMask|PointerMotionMask|EnterWindowMask
   1688 		|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
   1689 	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
   1690 	XSelectInput(dpy, root, wa.event_mask);
   1691 	grabkeys();
   1692 	focus(NULL);
   1693 }
   1694 
   1695 
   1696 void
   1697 seturgent(Client *c, int urg)
   1698 {
   1699 	XWMHints *wmh;
   1700 
   1701 	c->isurgent = urg;
   1702 	if (!(wmh = XGetWMHints(dpy, c->win)))
   1703 		return;
   1704 	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
   1705 	XSetWMHints(dpy, c->win, wmh);
   1706 	XFree(wmh);
   1707 }
   1708 
   1709 void
   1710 showhide(Client *c)
   1711 {
   1712 	if (!c)
   1713 		return;
   1714 	if (ISVISIBLE(c)) {
   1715 		/* show clients top down */
   1716 		XMoveWindow(dpy, c->win, c->x, c->y);
   1717 		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
   1718 			resize(c, c->x, c->y, c->w, c->h, 0);
   1719 		showhide(c->snext);
   1720 	} else {
   1721 		/* hide clients bottom up */
   1722 		showhide(c->snext);
   1723 		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
   1724 	}
   1725 }
   1726 
   1727 void
   1728 sigchld(int unused)
   1729 {
   1730 	if (signal(SIGCHLD, sigchld) == SIG_ERR)
   1731 		die("can't install SIGCHLD handler:");
   1732 	while (0 < waitpid(-1, NULL, WNOHANG));
   1733 }
   1734 
   1735 void
   1736 spawn(const Arg *arg)
   1737 {
   1738 	if (arg->v == dmenucmd)
   1739 		dmenumon[0] = '0' + selmon->num;
   1740 	if (fork() == 0) {
   1741 		if (dpy)
   1742 			close(ConnectionNumber(dpy));
   1743 		setsid();
   1744 		execvp(((char **)arg->v)[0], (char **)arg->v);
   1745 		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
   1746 		perror(" failed");
   1747 		exit(EXIT_SUCCESS);
   1748 	}
   1749 }
   1750 
   1751 void
   1752 tag(const Arg *arg)
   1753 {
   1754 	if (selmon->sel && arg->ui & TAGMASK) {
   1755 		selmon->sel->tags = arg->ui & TAGMASK;
   1756 		focus(NULL);
   1757 		arrange(selmon);
   1758 	}
   1759 }
   1760 
   1761 void
   1762 tagmon(const Arg *arg)
   1763 {
   1764 	if (!selmon->sel || !mons->next)
   1765 		return;
   1766 	sendmon(selmon->sel, dirtomon(arg->i));
   1767 }
   1768 
   1769 void
   1770 tile(Monitor *m)
   1771 {
   1772 	unsigned int i, n, h, mw, my, ty;
   1773 	Client *c;
   1774 
   1775 	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
   1776 	if (n == 0)
   1777 		return;
   1778 
   1779 	if (n > m->nmaster)
   1780 		mw = m->nmaster ? m->ww * m->mfact : 0;
   1781 	else
   1782 		mw = m->ww;
   1783 	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
   1784 		if (i < m->nmaster) {
   1785 			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
   1786 			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
   1787 			if (my + HEIGHT(c) < m->wh)
   1788 				my += HEIGHT(c);
   1789 		} else {
   1790 			h = (m->wh - ty) / (n - i);
   1791 			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
   1792 			if (ty + HEIGHT(c) < m->wh)
   1793 				ty += HEIGHT(c);
   1794 		}
   1795 }
   1796 
   1797 void
   1798 togglebar(const Arg *arg)
   1799 {
   1800 	selmon->showbar = !selmon->showbar;
   1801 	updatebarpos(selmon);
   1802 	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
   1803 	arrange(selmon);
   1804 }
   1805 
   1806 void
   1807 togglefloating(const Arg *arg)
   1808 {
   1809 	if (!selmon->sel)
   1810 		return;
   1811 	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
   1812 		return;
   1813 	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
   1814 	if (selmon->sel->isfloating)
   1815 		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
   1816 			selmon->sel->w, selmon->sel->h, 0);
   1817 	arrange(selmon);
   1818 }
   1819 
   1820 void
   1821 toggletag(const Arg *arg)
   1822 {
   1823 	unsigned int newtags;
   1824 
   1825 	if (!selmon->sel)
   1826 		return;
   1827 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
   1828 	if (newtags) {
   1829 		selmon->sel->tags = newtags;
   1830 		focus(NULL);
   1831 		arrange(selmon);
   1832 	}
   1833 }
   1834 
   1835 void
   1836 toggleview(const Arg *arg)
   1837 {
   1838 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
   1839 
   1840 	if (newtagset) {
   1841 		selmon->tagset[selmon->seltags] = newtagset;
   1842 		focus(NULL);
   1843 		arrange(selmon);
   1844 	}
   1845 }
   1846 
   1847 void
   1848 unfocus(Client *c, int setfocus)
   1849 {
   1850 	if (!c)
   1851 		return;
   1852 	grabbuttons(c, 0);
   1853 	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
   1854 	if (setfocus) {
   1855 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
   1856 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
   1857 	}
   1858 }
   1859 
   1860 void
   1861 unmanage(Client *c, int destroyed)
   1862 {
   1863 	Monitor *m = c->mon;
   1864 	XWindowChanges wc;
   1865 
   1866 	if (c->swallowing) {
   1867 		unswallow(c);
   1868 		return;
   1869 	}
   1870 
   1871 	Client *s = swallowingclient(c->win);
   1872 	if (s) {
   1873 		free(s->swallowing);
   1874 		s->swallowing = NULL;
   1875 		arrange(m);
   1876 		focus(NULL);
   1877 		return;
   1878 	}
   1879 
   1880 	detach(c);
   1881 	detachstack(c);
   1882 	if (!destroyed) {
   1883 		wc.border_width = c->oldbw;
   1884 		XGrabServer(dpy); /* avoid race conditions */
   1885 		XSetErrorHandler(xerrordummy);
   1886 		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
   1887 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
   1888 		setclientstate(c, WithdrawnState);
   1889 		XSync(dpy, False);
   1890 		XSetErrorHandler(xerror);
   1891 		XUngrabServer(dpy);
   1892 	}
   1893 	free(c);
   1894 
   1895 	if (!s) {
   1896 		arrange(m);
   1897 		focus(NULL);
   1898 		updateclientlist();
   1899 	}
   1900 }
   1901 
   1902 void
   1903 unmapnotify(XEvent *e)
   1904 {
   1905 	Client *c;
   1906 	XUnmapEvent *ev = &e->xunmap;
   1907 
   1908 	if ((c = wintoclient(ev->window))) {
   1909 		if (ev->send_event)
   1910 			setclientstate(c, WithdrawnState);
   1911 		else
   1912 			unmanage(c, 0);
   1913 	}
   1914 }
   1915 
   1916 void
   1917 updatebars(void)
   1918 {
   1919 	Monitor *m;
   1920 	XSetWindowAttributes wa = {
   1921 		.override_redirect = True,
   1922 		.background_pixmap = ParentRelative,
   1923 		.event_mask = ButtonPressMask|ExposureMask
   1924 	};
   1925 	XClassHint ch = {"dwm", "dwm"};
   1926 	for (m = mons; m; m = m->next) {
   1927 		if (m->barwin)
   1928 			continue;
   1929 		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
   1930 				CopyFromParent, DefaultVisual(dpy, screen),
   1931 				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
   1932 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
   1933 		XMapRaised(dpy, m->barwin);
   1934 		XSetClassHint(dpy, m->barwin, &ch);
   1935 	}
   1936 }
   1937 
   1938 void
   1939 updatebarpos(Monitor *m)
   1940 {
   1941 	m->wy = m->my;
   1942 	m->wh = m->mh;
   1943 	if (m->showbar) {
   1944 		m->wh -= bh;
   1945 		m->by = m->topbar ? m->wy : m->wy + m->wh;
   1946 		m->wy = m->topbar ? m->wy + bh : m->wy;
   1947 	} else
   1948 		m->by = -bh;
   1949 }
   1950 
   1951 void
   1952 updateclientlist()
   1953 {
   1954 	Client *c;
   1955 	Monitor *m;
   1956 
   1957 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1958 	for (m = mons; m; m = m->next)
   1959 		for (c = m->clients; c; c = c->next)
   1960 			XChangeProperty(dpy, root, netatom[NetClientList],
   1961 				XA_WINDOW, 32, PropModeAppend,
   1962 				(unsigned char *) &(c->win), 1);
   1963 }
   1964 
   1965 int
   1966 updategeom(void)
   1967 {
   1968 	int dirty = 0;
   1969 
   1970 #ifdef XINERAMA
   1971 	if (XineramaIsActive(dpy)) {
   1972 		int i, j, n, nn;
   1973 		Client *c;
   1974 		Monitor *m;
   1975 		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
   1976 		XineramaScreenInfo *unique = NULL;
   1977 
   1978 		for (n = 0, m = mons; m; m = m->next, n++);
   1979 		/* only consider unique geometries as separate screens */
   1980 		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
   1981 		for (i = 0, j = 0; i < nn; i++)
   1982 			if (isuniquegeom(unique, j, &info[i]))
   1983 				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
   1984 		XFree(info);
   1985 		nn = j;
   1986 		if (n <= nn) { /* new monitors available */
   1987 			for (i = 0; i < (nn - n); i++) {
   1988 				for (m = mons; m && m->next; m = m->next);
   1989 				if (m)
   1990 					m->next = createmon();
   1991 				else
   1992 					mons = createmon();
   1993 			}
   1994 			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
   1995 				if (i >= n
   1996 				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
   1997 				|| unique[i].width != m->mw || unique[i].height != m->mh)
   1998 				{
   1999 					dirty = 1;
   2000 					m->num = i;
   2001 					m->mx = m->wx = unique[i].x_org;
   2002 					m->my = m->wy = unique[i].y_org;
   2003 					m->mw = m->ww = unique[i].width;
   2004 					m->mh = m->wh = unique[i].height;
   2005 					updatebarpos(m);
   2006 				}
   2007 		} else { /* less monitors available nn < n */
   2008 			for (i = nn; i < n; i++) {
   2009 				for (m = mons; m && m->next; m = m->next);
   2010 				while ((c = m->clients)) {
   2011 					dirty = 1;
   2012 					m->clients = c->next;
   2013 					detachstack(c);
   2014 					c->mon = mons;
   2015 					attach(c);
   2016 					attachstack(c);
   2017 				}
   2018 				if (m == selmon)
   2019 					selmon = mons;
   2020 				cleanupmon(m);
   2021 			}
   2022 		}
   2023 		free(unique);
   2024 	} else
   2025 #endif /* XINERAMA */
   2026 	{ /* default monitor setup */
   2027 		if (!mons)
   2028 			mons = createmon();
   2029 		if (mons->mw != sw || mons->mh != sh) {
   2030 			dirty = 1;
   2031 			mons->mw = mons->ww = sw;
   2032 			mons->mh = mons->wh = sh;
   2033 			updatebarpos(mons);
   2034 		}
   2035 	}
   2036 	if (dirty) {
   2037 		selmon = mons;
   2038 		selmon = wintomon(root);
   2039 	}
   2040 	return dirty;
   2041 }
   2042 
   2043 void
   2044 updatenumlockmask(void)
   2045 {
   2046 	unsigned int i, j;
   2047 	XModifierKeymap *modmap;
   2048 
   2049 	numlockmask = 0;
   2050 	modmap = XGetModifierMapping(dpy);
   2051 	for (i = 0; i < 8; i++)
   2052 		for (j = 0; j < modmap->max_keypermod; j++)
   2053 			if (modmap->modifiermap[i * modmap->max_keypermod + j]
   2054 				== XKeysymToKeycode(dpy, XK_Num_Lock))
   2055 				numlockmask = (1 << i);
   2056 	XFreeModifiermap(modmap);
   2057 }
   2058 
   2059 void
   2060 updatesizehints(Client *c)
   2061 {
   2062 	long msize;
   2063 	XSizeHints size;
   2064 
   2065 	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
   2066 		/* size is uninitialized, ensure that size.flags aren't used */
   2067 		size.flags = PSize;
   2068 	if (size.flags & PBaseSize) {
   2069 		c->basew = size.base_width;
   2070 		c->baseh = size.base_height;
   2071 	} else if (size.flags & PMinSize) {
   2072 		c->basew = size.min_width;
   2073 		c->baseh = size.min_height;
   2074 	} else
   2075 		c->basew = c->baseh = 0;
   2076 	if (size.flags & PResizeInc) {
   2077 		c->incw = size.width_inc;
   2078 		c->inch = size.height_inc;
   2079 	} else
   2080 		c->incw = c->inch = 0;
   2081 	if (size.flags & PMaxSize) {
   2082 		c->maxw = size.max_width;
   2083 		c->maxh = size.max_height;
   2084 	} else
   2085 		c->maxw = c->maxh = 0;
   2086 	if (size.flags & PMinSize) {
   2087 		c->minw = size.min_width;
   2088 		c->minh = size.min_height;
   2089 	} else if (size.flags & PBaseSize) {
   2090 		c->minw = size.base_width;
   2091 		c->minh = size.base_height;
   2092 	} else
   2093 		c->minw = c->minh = 0;
   2094 	if (size.flags & PAspect) {
   2095 		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
   2096 		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
   2097 	} else
   2098 		c->maxa = c->mina = 0.0;
   2099 	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
   2100 }
   2101 
   2102 void
   2103 updatestatus(void)
   2104 {
   2105 	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
   2106 		strcpy(stext, "dwm-"VERSION);
   2107 	drawbar(selmon);
   2108 }
   2109 
   2110 void
   2111 updatetitle(Client *c)
   2112 {
   2113 	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
   2114 		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
   2115 	if (c->name[0] == '\0') /* hack to mark broken clients */
   2116 		strcpy(c->name, broken);
   2117 }
   2118 
   2119 void
   2120 updatewindowtype(Client *c)
   2121 {
   2122 	Atom state = getatomprop(c, netatom[NetWMState]);
   2123 	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
   2124 
   2125 	if (state == netatom[NetWMFullscreen])
   2126 		setfullscreen(c, 1);
   2127 	if (wtype == netatom[NetWMWindowTypeDialog])
   2128 		c->isfloating = 1;
   2129 }
   2130 
   2131 void
   2132 updatewmhints(Client *c)
   2133 {
   2134 	XWMHints *wmh;
   2135 
   2136 	if ((wmh = XGetWMHints(dpy, c->win))) {
   2137 		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
   2138 			wmh->flags &= ~XUrgencyHint;
   2139 			XSetWMHints(dpy, c->win, wmh);
   2140 		} else
   2141 			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
   2142 		if (wmh->flags & InputHint)
   2143 			c->neverfocus = !wmh->input;
   2144 		else
   2145 			c->neverfocus = 0;
   2146 		XFree(wmh);
   2147 	}
   2148 }
   2149 
   2150 void
   2151 view(const Arg *arg)
   2152 {
   2153 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
   2154 		return;
   2155 	selmon->seltags ^= 1; /* toggle sel tagset */
   2156 	if (arg->ui & TAGMASK)
   2157 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
   2158 	focus(NULL);
   2159 	arrange(selmon);
   2160 }
   2161 
   2162 pid_t
   2163 winpid(Window w)
   2164 {
   2165 	pid_t result = 0;
   2166 
   2167 	xcb_res_client_id_spec_t spec = {0};
   2168 	spec.client = w;
   2169 	spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
   2170 
   2171 	xcb_generic_error_t *e = NULL;
   2172 	xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
   2173 	xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
   2174 
   2175 	if (!r)
   2176 		return (pid_t)0;
   2177 
   2178 	xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
   2179 	for (; i.rem; xcb_res_client_id_value_next(&i)) {
   2180 		spec = i.data->spec;
   2181 		if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
   2182 			uint32_t *t = xcb_res_client_id_value_value(i.data);
   2183 			result = *t;
   2184 			break;
   2185 		}
   2186 	}
   2187 
   2188 	free(r);
   2189 
   2190 	if (result == (pid_t)-1)
   2191 		result = 0;
   2192 	return result;
   2193 }
   2194 
   2195 pid_t
   2196 getparentprocess(pid_t p)
   2197 {
   2198 	unsigned int v = 0;
   2199 
   2200 #ifdef __linux__
   2201 	FILE *f;
   2202 	char buf[256];
   2203 	snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
   2204 
   2205 	if (!(f = fopen(buf, "r")))
   2206 		return 0;
   2207 
   2208 	fscanf(f, "%*u %*s %*c %u", &v);
   2209 	fclose(f);
   2210 #endif /* __linux__ */
   2211 
   2212 	return (pid_t)v;
   2213 }
   2214 
   2215 	int
   2216 isdescprocess(pid_t p, pid_t c)
   2217 {
   2218 	while (p != c && c != 0)
   2219 		c = getparentprocess(c);
   2220 
   2221 	return (int)c;
   2222 }
   2223 
   2224 	Client *
   2225 termforwin(const Client *w)
   2226 {
   2227 	Client *c;
   2228 	Monitor *m;
   2229 
   2230 	if (!w->pid || w->isterminal)
   2231 		return NULL;
   2232 
   2233 	for (m = mons; m; m = m->next) {
   2234 		for (c = m->clients; c; c = c->next) {
   2235 			if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
   2236 				return c;
   2237 		}
   2238 	}
   2239 
   2240 	return NULL;
   2241 }
   2242 
   2243 Client *
   2244 swallowingclient(Window w)
   2245 {
   2246 	Client *c;
   2247 	Monitor *m;
   2248 
   2249 	for (m = mons; m; m = m->next) {
   2250 		for (c = m->clients; c; c = c->next) {
   2251 			if (c->swallowing && c->swallowing->win == w)
   2252 				return c;
   2253 		}
   2254 	}
   2255 
   2256 	return NULL;
   2257 }
   2258 
   2259 Client *
   2260 wintoclient(Window w)
   2261 {
   2262 	Client *c;
   2263 	Monitor *m;
   2264 
   2265 	for (m = mons; m; m = m->next)
   2266 		for (c = m->clients; c; c = c->next)
   2267 			if (c->win == w)
   2268 				return c;
   2269 	return NULL;
   2270 }
   2271 
   2272 Monitor *
   2273 wintomon(Window w)
   2274 {
   2275 	int x, y;
   2276 	Client *c;
   2277 	Monitor *m;
   2278 
   2279 	if (w == root && getrootptr(&x, &y))
   2280 		return recttomon(x, y, 1, 1);
   2281 	for (m = mons; m; m = m->next)
   2282 		if (w == m->barwin)
   2283 			return m;
   2284 	if ((c = wintoclient(w)))
   2285 		return c->mon;
   2286 	return selmon;
   2287 }
   2288 
   2289 /* There's no way to check accesses to destroyed windows, thus those cases are
   2290  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
   2291  * default error handler, which may call exit. */
   2292 int
   2293 xerror(Display *dpy, XErrorEvent *ee)
   2294 {
   2295 	if (ee->error_code == BadWindow
   2296 	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
   2297 	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
   2298 	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
   2299 	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
   2300 	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
   2301 	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
   2302 	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
   2303 	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
   2304 		return 0;
   2305 	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
   2306 		ee->request_code, ee->error_code);
   2307 	return xerrorxlib(dpy, ee); /* may call exit */
   2308 }
   2309 
   2310 int
   2311 xerrordummy(Display *dpy, XErrorEvent *ee)
   2312 {
   2313 	return 0;
   2314 }
   2315 
   2316 /* Startup Error handler to check if another window manager
   2317  * is already running. */
   2318 int
   2319 xerrorstart(Display *dpy, XErrorEvent *ee)
   2320 {
   2321 	die("dwm: another window manager is already running");
   2322 	return -1;
   2323 }
   2324 
   2325 void
   2326 zoom(const Arg *arg)
   2327 {
   2328 	Client *c = selmon->sel;
   2329 
   2330 	if (!selmon->lt[selmon->sellt]->arrange
   2331 	|| (selmon->sel && selmon->sel->isfloating))
   2332 		return;
   2333 	if (c == nexttiled(selmon->clients))
   2334 		if (!c || !(c = nexttiled(c->next)))
   2335 			return;
   2336 	pop(c);
   2337 }
   2338 
   2339 int
   2340 main(int argc, char *argv[])
   2341 {
   2342 	if (argc == 2 && !strcmp("-v", argv[1]))
   2343 		die("dwm-"VERSION);
   2344 	else if (argc != 1)
   2345 		die("usage: dwm [-v]");
   2346 	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
   2347 		fputs("warning: no locale support\n", stderr);
   2348 	if (!(dpy = XOpenDisplay(NULL)))
   2349 		die("dwm: cannot open display");
   2350 	if (!(xcon = XGetXCBConnection(dpy)))
   2351 		die("dwm: cannot get xcb connection\n");
   2352 	checkotherwm();
   2353 	setup();
   2354 #ifdef __OpenBSD__
   2355 	if (pledge("stdio rpath proc exec", NULL) == -1)
   2356 		die("pledge");
   2357 #endif /* __OpenBSD__ */
   2358 	scan();
   2359 	run();
   2360 	cleanup();
   2361 	XCloseDisplay(dpy);
   2362 	return EXIT_SUCCESS;
   2363 }
	dwm dynamic window manager
	git clone git://mfeller.io/dwm.git
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