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