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