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) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  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->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] && !c->isfullscreen) {
 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	Client *c;
 824	Monitor *m;
 825	XCrossingEvent *ev = &e->xcrossing;
 826
 827	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 828		return;
 829	c = wintoclient(ev->window);
 830	m = c ? c->mon : wintomon(ev->window);
 831	if(m != selmon) {
 832		unfocus(selmon->sel, True);
 833		selmon = m;
 834	}
 835	else if(!c || c == selmon->sel)
 836		return;
 837	focus(c);
 838}
 839
 840void
 841expose(XEvent *e) {
 842	Monitor *m;
 843	XExposeEvent *ev = &e->xexpose;
 844
 845	if(ev->count == 0 && (m = wintomon(ev->window)))
 846		drawbar(m);
 847}
 848
 849void
 850focus(Client *c) {
 851	if(!c || !ISVISIBLE(c))
 852		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 853	/* was if(selmon->sel) */
 854	if(selmon->sel && selmon->sel != c)
 855		unfocus(selmon->sel, False);
 856	if(c) {
 857		if(c->mon != selmon)
 858			selmon = c->mon;
 859		if(c->isurgent)
 860			clearurgent(c);
 861		detachstack(c);
 862		attachstack(c);
 863		grabbuttons(c, True);
 864		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 865		setfocus(c);
 866	}
 867	else
 868		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 869	selmon->sel = c;
 870	drawbars();
 871}
 872
 873void
 874focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 875	XFocusChangeEvent *ev = &e->xfocus;
 876
 877	if(selmon->sel && ev->window != selmon->sel->win)
 878		setfocus(selmon->sel);
 879}
 880
 881void
 882focusmon(const Arg *arg) {
 883	Monitor *m;
 884
 885	if(!mons->next)
 886		return;
 887	if((m = dirtomon(arg->i)) == selmon)
 888		return;
 889	unfocus(selmon->sel, True);
 890	selmon = m;
 891	focus(NULL);
 892}
 893
 894void
 895focusstack(const Arg *arg) {
 896	Client *c = NULL, *i;
 897
 898	if(!selmon->sel)
 899		return;
 900	if(arg->i > 0) {
 901		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 902		if(!c)
 903			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 904	}
 905	else {
 906		for(i = selmon->clients; i != selmon->sel; i = i->next)
 907			if(ISVISIBLE(i))
 908				c = i;
 909		if(!c)
 910			for(; i; i = i->next)
 911				if(ISVISIBLE(i))
 912					c = i;
 913	}
 914	if(c) {
 915		focus(c);
 916		restack(selmon);
 917	}
 918}
 919
 920unsigned long
 921getcolor(const char *colstr) {
 922	Colormap cmap = DefaultColormap(dpy, screen);
 923	XColor color;
 924
 925	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 926		die("error, cannot allocate color '%s'\n", colstr);
 927	return color.pixel;
 928}
 929
 930Bool
 931getrootptr(int *x, int *y) {
 932	int di;
 933	unsigned int dui;
 934	Window dummy;
 935
 936	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 937}
 938
 939long
 940getstate(Window w) {
 941	int format;
 942	long result = -1;
 943	unsigned char *p = NULL;
 944	unsigned long n, extra;
 945	Atom real;
 946
 947	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 948	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 949		return -1;
 950	if(n != 0)
 951		result = *p;
 952	XFree(p);
 953	return result;
 954}
 955
 956Bool
 957gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 958	char **list = NULL;
 959	int n;
 960	XTextProperty name;
 961
 962	if(!text || size == 0)
 963		return False;
 964	text[0] = '\0';
 965	XGetTextProperty(dpy, w, &name, atom);
 966	if(!name.nitems)
 967		return False;
 968	if(name.encoding == XA_STRING)
 969		strncpy(text, (char *)name.value, size - 1);
 970	else {
 971		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 972			strncpy(text, *list, size - 1);
 973			XFreeStringList(list);
 974		}
 975	}
 976	text[size - 1] = '\0';
 977	XFree(name.value);
 978	return True;
 979}
 980
 981void
 982grabbuttons(Client *c, Bool focused) {
 983	updatenumlockmask();
 984	{
 985		unsigned int i, j;
 986		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 987		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 988		if(focused) {
 989			for(i = 0; i < LENGTH(buttons); i++)
 990				if(buttons[i].click == ClkClientWin)
 991					for(j = 0; j < LENGTH(modifiers); j++)
 992						XGrabButton(dpy, buttons[i].button,
 993						            buttons[i].mask | modifiers[j],
 994						            c->win, False, BUTTONMASK,
 995						            GrabModeAsync, GrabModeSync, None, None);
 996		}
 997		else
 998			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 999			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1000	}
1001}
1002
1003void
1004grabkeys(void) {
1005	updatenumlockmask();
1006	{
1007		unsigned int i, j;
1008		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1009		KeyCode code;
1010
1011		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1012		for(i = 0; i < LENGTH(keys); i++) {
1013			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1014				for(j = 0; j < LENGTH(modifiers); j++)
1015					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1016						 True, GrabModeAsync, GrabModeAsync);
1017		}
1018	}
1019}
1020
1021void
1022initfont(const char *fontstr) {
1023	char *def, **missing;
1024	int n;
1025
1026	missing = NULL;
1027	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1028	if(missing) {
1029		while(n--)
1030			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1031		XFreeStringList(missing);
1032	}
1033	if(dc.font.set) {
1034		XFontStruct **xfonts;
1035		char **font_names;
1036
1037		dc.font.ascent = dc.font.descent = 0;
1038		XExtentsOfFontSet(dc.font.set);
1039		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1040		while(n--) {
1041			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1042			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1043			xfonts++;
1044		}
1045	}
1046	else {
1047		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1048		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1049			die("error, cannot load font: '%s'\n", fontstr);
1050		dc.font.ascent = dc.font.xfont->ascent;
1051		dc.font.descent = dc.font.xfont->descent;
1052	}
1053	dc.font.height = dc.font.ascent + dc.font.descent;
1054}
1055
1056#ifdef XINERAMA
1057static Bool
1058isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1059	while(n--)
1060		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1061		&& unique[n].width == info->width && unique[n].height == info->height)
1062			return False;
1063	return True;
1064}
1065#endif /* XINERAMA */
1066
1067void
1068keypress(XEvent *e) {
1069	unsigned int i;
1070	KeySym keysym;
1071	XKeyEvent *ev;
1072
1073	ev = &e->xkey;
1074	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1075	for(i = 0; i < LENGTH(keys); i++)
1076		if(keysym == keys[i].keysym
1077		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1078		&& keys[i].func)
1079			keys[i].func(&(keys[i].arg));
1080}
1081
1082void
1083killclient(const Arg *arg) {
1084	if(!selmon->sel)
1085		return;
1086	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1087		XGrabServer(dpy);
1088		XSetErrorHandler(xerrordummy);
1089		XSetCloseDownMode(dpy, DestroyAll);
1090		XKillClient(dpy, selmon->sel->win);
1091		XSync(dpy, False);
1092		XSetErrorHandler(xerror);
1093		XUngrabServer(dpy);
1094	}
1095}
1096
1097void
1098manage(Window w, XWindowAttributes *wa) {
1099	Client *c, *t = NULL;
1100	Window trans = None;
1101	XWindowChanges wc;
1102
1103	if(!(c = calloc(1, sizeof(Client))))
1104		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1105	c->win = w;
1106	updatetitle(c);
1107	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1108		c->mon = t->mon;
1109		c->tags = t->tags;
1110	}
1111	else {
1112		c->mon = selmon;
1113		applyrules(c);
1114	}
1115	/* geometry */
1116	c->x = c->oldx = wa->x;
1117	c->y = c->oldy = wa->y;
1118	c->w = c->oldw = wa->width;
1119	c->h = c->oldh = wa->height;
1120	c->oldbw = wa->border_width;
1121	if(c->w == c->mon->mw && c->h == c->mon->mh) {
1122		c->isfloating = True;
1123		c->x = c->mon->mx;
1124		c->y = c->mon->my;
1125		c->bw = 0;
1126	}
1127	else {
1128		if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1129			c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1130		if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1131			c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1132		c->x = MAX(c->x, c->mon->mx);
1133		/* only fix client y-offset, if the client center might cover the bar */
1134		c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1135		           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1136		c->bw = borderpx;
1137	}
1138	wc.border_width = c->bw;
1139	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1140	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1141	configure(c); /* propagates border_width, if size doesn't change */
1142	updatesizehints(c);
1143	updatewmhints(c);
1144	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1145	grabbuttons(c, False);
1146	if(!c->isfloating)
1147		c->isfloating = c->oldstate = trans != None || c->isfixed;
1148	if(c->isfloating)
1149		XRaiseWindow(dpy, c->win);
1150	attach(c);
1151	attachstack(c);
1152	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1153	XMapWindow(dpy, c->win);
1154	setclientstate(c, NormalState);
1155	arrange(c->mon);
1156}
1157
1158void
1159mappingnotify(XEvent *e) {
1160	XMappingEvent *ev = &e->xmapping;
1161
1162	XRefreshKeyboardMapping(ev);
1163	if(ev->request == MappingKeyboard)
1164		grabkeys();
1165}
1166
1167void
1168maprequest(XEvent *e) {
1169	static XWindowAttributes wa;
1170	XMapRequestEvent *ev = &e->xmaprequest;
1171
1172	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1173		return;
1174	if(wa.override_redirect)
1175		return;
1176	if(!wintoclient(ev->window))
1177		manage(ev->window, &wa);
1178}
1179
1180void
1181monocle(Monitor *m) {
1182	unsigned int n = 0;
1183	Client *c;
1184
1185	for(c = m->clients; c; c = c->next)
1186		if(ISVISIBLE(c))
1187			n++;
1188	if(n > 0) /* override layout symbol */
1189		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1190	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1191		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1192}
1193
1194void
1195movemouse(const Arg *arg) {
1196	int x, y, ocx, ocy, nx, ny;
1197	Client *c;
1198	Monitor *m;
1199	XEvent ev;
1200
1201	if(!(c = selmon->sel))
1202		return;
1203	restack(selmon);
1204	ocx = c->x;
1205	ocy = c->y;
1206	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1207	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1208		return;
1209	if(!getrootptr(&x, &y))
1210		return;
1211	do {
1212		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1213		switch(ev.type) {
1214		case ConfigureRequest:
1215		case Expose:
1216		case MapRequest:
1217			handler[ev.type](&ev);
1218			break;
1219		case MotionNotify:
1220			nx = ocx + (ev.xmotion.x - x);
1221			ny = ocy + (ev.xmotion.y - y);
1222			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1223			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1224				if(abs(selmon->wx - nx) < snap)
1225					nx = selmon->wx;
1226				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1227					nx = selmon->wx + selmon->ww - WIDTH(c);
1228				if(abs(selmon->wy - ny) < snap)
1229					ny = selmon->wy;
1230				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1231					ny = selmon->wy + selmon->wh - HEIGHT(c);
1232				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1233				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1234					togglefloating(NULL);
1235			}
1236			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1237				resize(c, nx, ny, c->w, c->h, True);
1238			break;
1239		}
1240	} while(ev.type != ButtonRelease);
1241	XUngrabPointer(dpy, CurrentTime);
1242	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1243		sendmon(c, m);
1244		selmon = m;
1245		focus(NULL);
1246	}
1247}
1248
1249Client *
1250nexttiled(Client *c) {
1251	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1252	return c;
1253}
1254
1255void
1256pop(Client *c) {
1257	detach(c);
1258	attach(c);
1259	focus(c);
1260	arrange(c->mon);
1261}
1262
1263void
1264propertynotify(XEvent *e) {
1265	Client *c;
1266	Window trans;
1267	XPropertyEvent *ev = &e->xproperty;
1268
1269	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1270		updatestatus();
1271	else if(ev->state == PropertyDelete)
1272		return; /* ignore */
1273	else if((c = wintoclient(ev->window))) {
1274		switch(ev->atom) {
1275		default: break;
1276		case XA_WM_TRANSIENT_FOR:
1277			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1278			   (c->isfloating = (wintoclient(trans)) != NULL))
1279				arrange(c->mon);
1280			break;
1281		case XA_WM_NORMAL_HINTS:
1282			updatesizehints(c);
1283			break;
1284		case XA_WM_HINTS:
1285			updatewmhints(c);
1286			drawbars();
1287			break;
1288		}
1289		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1290			updatetitle(c);
1291			if(c == c->mon->sel)
1292				drawbar(c->mon);
1293		}
1294	}
1295}
1296
1297Monitor *
1298ptrtomon(int x, int y) {
1299	Monitor *m;
1300
1301	for(m = mons; m; m = m->next)
1302		if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1303			return m;
1304	return selmon;
1305}
1306void
1307quit(const Arg *arg) {
1308	running = False;
1309}
1310
1311void
1312resize(Client *c, int x, int y, int w, int h, Bool interact) {
1313	if(applysizehints(c, &x, &y, &w, &h, interact))
1314		resizeclient(c, x, y, w, h);
1315}
1316
1317void
1318resizeclient(Client *c, int x, int y, int w, int h) {
1319	XWindowChanges wc;
1320
1321	c->oldx = c->x; c->x = wc.x = x;
1322	c->oldy = c->y; c->y = wc.y = y;
1323	c->oldw = c->w; c->w = wc.width = w;
1324	c->oldh = c->h; c->h = wc.height = h;
1325	wc.border_width = c->bw;
1326	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1327	configure(c);
1328	XSync(dpy, False);
1329}
1330
1331void
1332resizemouse(const Arg *arg) {
1333	int ocx, ocy;
1334	int nw, nh;
1335	Client *c;
1336	Monitor *m;
1337	XEvent ev;
1338
1339	if(!(c = selmon->sel))
1340		return;
1341	restack(selmon);
1342	ocx = c->x;
1343	ocy = c->y;
1344	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1345	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1346		return;
1347	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1348	do {
1349		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1350		switch(ev.type) {
1351		case ConfigureRequest:
1352		case Expose:
1353		case MapRequest:
1354			handler[ev.type](&ev);
1355			break;
1356		case MotionNotify:
1357			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1358			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1359			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1360			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1361			{
1362				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1363				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1364					togglefloating(NULL);
1365			}
1366			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1367				resize(c, c->x, c->y, nw, nh, True);
1368			break;
1369		}
1370	} while(ev.type != ButtonRelease);
1371	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1372	XUngrabPointer(dpy, CurrentTime);
1373	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1374	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1375		sendmon(c, m);
1376		selmon = m;
1377		focus(NULL);
1378	}
1379}
1380
1381void
1382restack(Monitor *m) {
1383	Client *c;
1384	XEvent ev;
1385	XWindowChanges wc;
1386
1387	drawbar(m);
1388	if(!m->sel)
1389		return;
1390	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1391		XRaiseWindow(dpy, m->sel->win);
1392	if(m->lt[m->sellt]->arrange) {
1393		wc.stack_mode = Below;
1394		wc.sibling = m->barwin;
1395		for(c = m->stack; c; c = c->snext)
1396			if(!c->isfloating && ISVISIBLE(c)) {
1397				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1398				wc.sibling = c->win;
1399			}
1400	}
1401	XSync(dpy, False);
1402	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1403}
1404
1405void
1406run(void) {
1407	XEvent ev;
1408	/* main event loop */
1409	XSync(dpy, False);
1410	while(running && !XNextEvent(dpy, &ev)) {
1411		if(handler[ev.type])
1412			handler[ev.type](&ev); /* call handler */
1413	}
1414}
1415
1416void
1417scan(void) {
1418	unsigned int i, num;
1419	Window d1, d2, *wins = NULL;
1420	XWindowAttributes wa;
1421
1422	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1423		for(i = 0; i < num; i++) {
1424			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1425			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1426				continue;
1427			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1428				manage(wins[i], &wa);
1429		}
1430		for(i = 0; i < num; i++) { /* now the transients */
1431			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1432				continue;
1433			if(XGetTransientForHint(dpy, wins[i], &d1)
1434			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1435				manage(wins[i], &wa);
1436		}
1437		if(wins)
1438			XFree(wins);
1439	}
1440}
1441
1442void
1443sendmon(Client *c, Monitor *m) {
1444	if(c->mon == m)
1445		return;
1446	unfocus(c, True);
1447	detach(c);
1448	detachstack(c);
1449	c->mon = m;
1450	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1451	attach(c);
1452	attachstack(c);
1453	focus(NULL);
1454	arrange(NULL);
1455}
1456
1457void
1458setclientstate(Client *c, long state) {
1459	long data[] = { state, None };
1460
1461	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1462			PropModeReplace, (unsigned char *)data, 2);
1463}
1464
1465Bool
1466sendevent(Client *c, Atom proto) {
1467	int n;
1468	Atom *protocols;
1469	Bool exists = False;
1470	XEvent ev;
1471
1472	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1473		while(!exists && n--)
1474			exists = protocols[n] == proto;
1475		XFree(protocols);
1476	}
1477	if(exists) {
1478		ev.type = ClientMessage;
1479		ev.xclient.window = c->win;
1480		ev.xclient.message_type = wmatom[WMProtocols];
1481		ev.xclient.format = 32;
1482		ev.xclient.data.l[0] = proto;
1483		ev.xclient.data.l[1] = CurrentTime;
1484		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1485	}
1486	return exists;
1487}
1488
1489void
1490setfocus(Client *c) {
1491	if(!c->neverfocus)
1492		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1493	sendevent(c, wmatom[WMTakeFocus]);
1494}
1495
1496void
1497setlayout(const Arg *arg) {
1498	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1499		selmon->sellt ^= 1;
1500	if(arg && arg->v)
1501		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1502	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1503	if(selmon->sel)
1504		arrange(selmon);
1505	else
1506		drawbar(selmon);
1507}
1508
1509/* arg > 1.0 will set mfact absolutly */
1510void
1511setmfact(const Arg *arg) {
1512	float f;
1513
1514	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1515		return;
1516	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1517	if(f < 0.1 || f > 0.9)
1518		return;
1519	selmon->mfact = f;
1520	arrange(selmon);
1521}
1522
1523void
1524setup(void) {
1525	XSetWindowAttributes wa;
1526
1527	/* clean up any zombies immediately */
1528	sigchld(0);
1529
1530	/* init screen */
1531	screen = DefaultScreen(dpy);
1532	root = RootWindow(dpy, screen);
1533	initfont(font);
1534	sw = DisplayWidth(dpy, screen);
1535	sh = DisplayHeight(dpy, screen);
1536	bh = dc.h = dc.font.height + 2;
1537	updategeom();
1538	/* init atoms */
1539	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1540	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1541	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1542	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1543	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1544	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1545	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1546	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1547	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1548	/* init cursors */
1549	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1550	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1551	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1552	/* init appearance */
1553	dc.norm[ColBorder] = getcolor(normbordercolor);
1554	dc.norm[ColBG] = getcolor(normbgcolor);
1555	dc.norm[ColFG] = getcolor(normfgcolor);
1556	dc.sel[ColBorder] = getcolor(selbordercolor);
1557	dc.sel[ColBG] = getcolor(selbgcolor);
1558	dc.sel[ColFG] = getcolor(selfgcolor);
1559	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1560	dc.gc = XCreateGC(dpy, root, 0, NULL);
1561	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1562	if(!dc.font.set)
1563		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1564	/* init bars */
1565	updatebars();
1566	updatestatus();
1567	/* EWMH support per view */
1568	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1569			PropModeReplace, (unsigned char *) netatom, NetLast);
1570	/* select for events */
1571	wa.cursor = cursor[CurNormal];
1572	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1573	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1574	                |PropertyChangeMask;
1575	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1576	XSelectInput(dpy, root, wa.event_mask);
1577	grabkeys();
1578}
1579
1580void
1581showhide(Client *c) {
1582	if(!c)
1583		return;
1584	if(ISVISIBLE(c)) { /* show clients top down */
1585		XMoveWindow(dpy, c->win, c->x, c->y);
1586		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1587			resize(c, c->x, c->y, c->w, c->h, False);
1588		showhide(c->snext);
1589	}
1590	else { /* hide clients bottom up */
1591		showhide(c->snext);
1592		XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1593	}
1594}
1595
1596void
1597sigchld(int unused) {
1598	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1599		die("Can't install SIGCHLD handler");
1600	while(0 < waitpid(-1, NULL, WNOHANG));
1601}
1602
1603void
1604spawn(const Arg *arg) {
1605	if(fork() == 0) {
1606		if(dpy)
1607			close(ConnectionNumber(dpy));
1608		setsid();
1609		execvp(((char **)arg->v)[0], (char **)arg->v);
1610		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1611		perror(" failed");
1612		exit(EXIT_SUCCESS);
1613	}
1614}
1615
1616void
1617tag(const Arg *arg) {
1618	if(selmon->sel && arg->ui & TAGMASK) {
1619		selmon->sel->tags = arg->ui & TAGMASK;
1620		arrange(selmon);
1621	}
1622}
1623
1624void
1625tagmon(const Arg *arg) {
1626	if(!selmon->sel || !mons->next)
1627		return;
1628	sendmon(selmon->sel, dirtomon(arg->i));
1629}
1630
1631int
1632textnw(const char *text, unsigned int len) {
1633	XRectangle r;
1634
1635	if(dc.font.set) {
1636		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1637		return r.width;
1638	}
1639	return XTextWidth(dc.font.xfont, text, len);
1640}
1641
1642void
1643tile(Monitor *m) {
1644	int x, y, h, w, mw;
1645	unsigned int i, n;
1646	Client *c;
1647
1648	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1649	if(n == 0)
1650		return;
1651	/* master */
1652	c = nexttiled(m->clients);
1653	mw = m->mfact * m->ww;
1654	resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1655	if(--n == 0)
1656		return;
1657	/* tile stack */
1658	x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1659	y = m->wy;
1660	w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1661	h = m->wh / n;
1662	if(h < bh)
1663		h = m->wh;
1664	for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1665		resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1666		       ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1667		if(h != m->wh)
1668			y = c->y + HEIGHT(c);
1669	}
1670}
1671
1672void
1673togglebar(const Arg *arg) {
1674	selmon->showbar = !selmon->showbar;
1675	updatebarpos(selmon);
1676	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1677	arrange(selmon);
1678}
1679
1680void
1681togglefloating(const Arg *arg) {
1682	if(!selmon->sel)
1683		return;
1684	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1685	if(selmon->sel->isfloating)
1686		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1687		       selmon->sel->w, selmon->sel->h, False);
1688	arrange(selmon);
1689}
1690
1691void
1692toggletag(const Arg *arg) {
1693	unsigned int newtags;
1694
1695	if(!selmon->sel)
1696		return;
1697	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1698	if(newtags) {
1699		selmon->sel->tags = newtags;
1700		arrange(selmon);
1701	}
1702}
1703
1704void
1705toggleview(const Arg *arg) {
1706	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1707
1708	if(newtagset) {
1709		selmon->tagset[selmon->seltags] = newtagset;
1710		arrange(selmon);
1711	}
1712}
1713
1714void
1715unfocus(Client *c, Bool setfocus) {
1716	if(!c)
1717		return;
1718	grabbuttons(c, False);
1719	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1720	if(setfocus)
1721		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1722}
1723
1724void
1725unmanage(Client *c, Bool destroyed) {
1726	Monitor *m = c->mon;
1727	XWindowChanges wc;
1728
1729	/* The server grab construct avoids race conditions. */
1730	detach(c);
1731	detachstack(c);
1732	if(!destroyed) {
1733		wc.border_width = c->oldbw;
1734		XGrabServer(dpy);
1735		XSetErrorHandler(xerrordummy);
1736		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1737		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1738		setclientstate(c, WithdrawnState);
1739		XSync(dpy, False);
1740		XSetErrorHandler(xerror);
1741		XUngrabServer(dpy);
1742	}
1743	free(c);
1744	focus(NULL);
1745	arrange(m);
1746}
1747
1748void
1749unmapnotify(XEvent *e) {
1750	Client *c;
1751	XUnmapEvent *ev = &e->xunmap;
1752
1753	if((c = wintoclient(ev->window)))
1754		unmanage(c, False);
1755}
1756
1757void
1758updatebars(void) {
1759	Monitor *m;
1760	XSetWindowAttributes wa = {
1761		.override_redirect = True,
1762		.background_pixmap = ParentRelative,
1763		.event_mask = ButtonPressMask|ExposureMask
1764	};
1765	for(m = mons; m; m = m->next) {
1766		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1767		                          CopyFromParent, DefaultVisual(dpy, screen),
1768		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1769		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1770		XMapRaised(dpy, m->barwin);
1771	}
1772}
1773
1774void
1775updatebarpos(Monitor *m) {
1776	m->wy = m->my;
1777	m->wh = m->mh;
1778	if(m->showbar) {
1779		m->wh -= bh;
1780		m->by = m->topbar ? m->wy : m->wy + m->wh;
1781		m->wy = m->topbar ? m->wy + bh : m->wy;
1782	}
1783	else
1784		m->by = -bh;
1785}
1786
1787Bool
1788updategeom(void) {
1789	Bool dirty = False;
1790
1791#ifdef XINERAMA
1792	if(XineramaIsActive(dpy)) {
1793		int i, j, n, nn;
1794		Client *c;
1795		Monitor *m;
1796		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1797		XineramaScreenInfo *unique = NULL;
1798
1799		for(n = 0, m = mons; m; m = m->next, n++);
1800		/* only consider unique geometries as separate screens */
1801		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1802			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1803		for(i = 0, j = 0; i < nn; i++)
1804			if(isuniquegeom(unique, j, &info[i]))
1805				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1806		XFree(info);
1807		nn = j;
1808		if(n <= nn) {
1809			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1810				for(m = mons; m && m->next; m = m->next);
1811				if(m)
1812					m->next = createmon();
1813				else
1814					mons = createmon();
1815			}
1816			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1817				if(i >= n
1818				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1819				    || unique[i].width != m->mw || unique[i].height != m->mh))
1820				{
1821					dirty = True;
1822					m->num = i;
1823					m->mx = m->wx = unique[i].x_org;
1824					m->my = m->wy = unique[i].y_org;
1825					m->mw = m->ww = unique[i].width;
1826					m->mh = m->wh = unique[i].height;
1827					updatebarpos(m);
1828				}
1829		}
1830		else { /* less monitors available nn < n */
1831			for(i = nn; i < n; i++) {
1832				for(m = mons; m && m->next; m = m->next);
1833				while(m->clients) {
1834					dirty = True;
1835					c = m->clients;
1836					m->clients = c->next;
1837					detachstack(c);
1838					c->mon = mons;
1839					attach(c);
1840					attachstack(c);
1841				}
1842				if(m == selmon)
1843					selmon = mons;
1844				cleanupmon(m);
1845			}
1846		}
1847		free(unique);
1848	}
1849	else
1850#endif /* XINERAMA */
1851	/* default monitor setup */
1852	{
1853		if(!mons)
1854			mons = createmon();
1855		if(mons->mw != sw || mons->mh != sh) {
1856			dirty = True;
1857			mons->mw = mons->ww = sw;
1858			mons->mh = mons->wh = sh;
1859			updatebarpos(mons);
1860		}
1861	}
1862	if(dirty) {
1863		selmon = mons;
1864		selmon = wintomon(root);
1865	}
1866	return dirty;
1867}
1868
1869void
1870updatenumlockmask(void) {
1871	unsigned int i, j;
1872	XModifierKeymap *modmap;
1873
1874	numlockmask = 0;
1875	modmap = XGetModifierMapping(dpy);
1876	for(i = 0; i < 8; i++)
1877		for(j = 0; j < modmap->max_keypermod; j++)
1878			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1879			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1880				numlockmask = (1 << i);
1881	XFreeModifiermap(modmap);
1882}
1883
1884void
1885updatesizehints(Client *c) {
1886	long msize;
1887	XSizeHints size;
1888
1889	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1890		/* size is uninitialized, ensure that size.flags aren't used */
1891		size.flags = PSize;
1892	if(size.flags & PBaseSize) {
1893		c->basew = size.base_width;
1894		c->baseh = size.base_height;
1895	}
1896	else if(size.flags & PMinSize) {
1897		c->basew = size.min_width;
1898		c->baseh = size.min_height;
1899	}
1900	else
1901		c->basew = c->baseh = 0;
1902	if(size.flags & PResizeInc) {
1903		c->incw = size.width_inc;
1904		c->inch = size.height_inc;
1905	}
1906	else
1907		c->incw = c->inch = 0;
1908	if(size.flags & PMaxSize) {
1909		c->maxw = size.max_width;
1910		c->maxh = size.max_height;
1911	}
1912	else
1913		c->maxw = c->maxh = 0;
1914	if(size.flags & PMinSize) {
1915		c->minw = size.min_width;
1916		c->minh = size.min_height;
1917	}
1918	else if(size.flags & PBaseSize) {
1919		c->minw = size.base_width;
1920		c->minh = size.base_height;
1921	}
1922	else
1923		c->minw = c->minh = 0;
1924	if(size.flags & PAspect) {
1925		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1926		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1927	}
1928	else
1929		c->maxa = c->mina = 0.0;
1930	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1931	             && c->maxw == c->minw && c->maxh == c->minh);
1932}
1933
1934void
1935updatetitle(Client *c) {
1936	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1937		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1938	if(c->name[0] == '\0') /* hack to mark broken clients */
1939		strcpy(c->name, broken);
1940}
1941
1942void
1943updatestatus(void) {
1944	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1945		strcpy(stext, "dwm-"VERSION);
1946	drawbar(selmon);
1947}
1948
1949void
1950updatewmhints(Client *c) {
1951	XWMHints *wmh;
1952
1953	if((wmh = XGetWMHints(dpy, c->win))) {
1954		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1955			wmh->flags &= ~XUrgencyHint;
1956			XSetWMHints(dpy, c->win, wmh);
1957		}
1958		else
1959			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1960		if(wmh->flags & InputHint)
1961			c->neverfocus = !wmh->input;
1962		else
1963			c->neverfocus = False;
1964		XFree(wmh);
1965	}
1966}
1967
1968void
1969view(const Arg *arg) {
1970	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1971		return;
1972	selmon->seltags ^= 1; /* toggle sel tagset */
1973	if(arg->ui & TAGMASK)
1974		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1975	arrange(selmon);
1976}
1977
1978Client *
1979wintoclient(Window w) {
1980	Client *c;
1981	Monitor *m;
1982
1983	for(m = mons; m; m = m->next)
1984		for(c = m->clients; c; c = c->next)
1985			if(c->win == w)
1986				return c;
1987	return NULL;
1988}
1989
1990Monitor *
1991wintomon(Window w) {
1992	int x, y;
1993	Client *c;
1994	Monitor *m;
1995
1996	if(w == root && getrootptr(&x, &y))
1997		return ptrtomon(x, y);
1998	for(m = mons; m; m = m->next)
1999		if(w == m->barwin)
2000			return m;
2001	if((c = wintoclient(w)))
2002		return c->mon;
2003	return selmon;
2004}
2005
2006/* There's no way to check accesses to destroyed windows, thus those cases are
2007 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2008 * default error handler, which may call exit.  */
2009int
2010xerror(Display *dpy, XErrorEvent *ee) {
2011	if(ee->error_code == BadWindow
2012	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2013	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2014	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2015	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2016	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2017	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2018	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2019	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2020		return 0;
2021	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2022			ee->request_code, ee->error_code);
2023	return xerrorxlib(dpy, ee); /* may call exit */
2024}
2025
2026int
2027xerrordummy(Display *dpy, XErrorEvent *ee) {
2028	return 0;
2029}
2030
2031/* Startup Error handler to check if another window manager
2032 * is already running. */
2033int
2034xerrorstart(Display *dpy, XErrorEvent *ee) {
2035	die("dwm: another window manager is already running\n");
2036	return -1;
2037}
2038
2039void
2040zoom(const Arg *arg) {
2041	Client *c = selmon->sel;
2042
2043	if(!selmon->lt[selmon->sellt]->arrange
2044	|| (selmon->sel && selmon->sel->isfloating))
2045		return;
2046	if(c == nexttiled(selmon->clients))
2047		if(!c || !(c = nexttiled(c->next)))
2048			return;
2049	pop(c);
2050}
2051
2052int
2053main(int argc, char *argv[]) {
2054	if(argc == 2 && !strcmp("-v", argv[1]))
2055		die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2056	else if(argc != 1)
2057		die("usage: dwm [-v]\n");
2058	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2059		fputs("warning: no locale support\n", stderr);
2060	if(!(dpy = XOpenDisplay(NULL)))
2061		die("dwm: cannot open display\n");
2062	checkotherwm();
2063	setup();
2064	scan();
2065	run();
2066	cleanup();
2067	XCloseDisplay(dpy);
2068	return EXIT_SUCCESS;
2069}