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
 589	if(ev->window == root) {
 590		sw = ev->width;
 591		sh = ev->height;
 592		if(updategeom()) {
 593			if(dc.drawable != 0)
 594				XFreePixmap(dpy, dc.drawable);
 595			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 596			updatebars();
 597			for(m = mons; m; m = m->next)
 598				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 599			arrange(NULL);
 600		}
 601	}
 602}
 603
 604void
 605configurerequest(XEvent *e) {
 606	Client *c;
 607	Monitor *m;
 608	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 609	XWindowChanges wc;
 610
 611	if((c = wintoclient(ev->window))) {
 612		if(ev->value_mask & CWBorderWidth)
 613			c->bw = ev->border_width;
 614		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 615			m = c->mon;
 616			if(ev->value_mask & CWX)
 617				c->x = m->mx + ev->x;
 618			if(ev->value_mask & CWY)
 619				c->y = m->my + ev->y;
 620			if(ev->value_mask & CWWidth)
 621				c->w = ev->width;
 622			if(ev->value_mask & CWHeight)
 623				c->h = ev->height;
 624			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 625				c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 626			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 627				c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 628			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 629				configure(c);
 630			if(ISVISIBLE(c))
 631				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 632		}
 633		else
 634			configure(c);
 635	}
 636	else {
 637		wc.x = ev->x;
 638		wc.y = ev->y;
 639		wc.width = ev->width;
 640		wc.height = ev->height;
 641		wc.border_width = ev->border_width;
 642		wc.sibling = ev->above;
 643		wc.stack_mode = ev->detail;
 644		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 645	}
 646	XSync(dpy, False);
 647}
 648
 649Monitor *
 650createmon(void) {
 651	Monitor *m;
 652
 653	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 654		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 655	m->tagset[0] = m->tagset[1] = 1;
 656	m->mfact = mfact;
 657	m->showbar = showbar;
 658	m->topbar = topbar;
 659	m->lt[0] = &layouts[0];
 660	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 661	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 662	return m;
 663}
 664
 665void
 666destroynotify(XEvent *e) {
 667	Client *c;
 668	XDestroyWindowEvent *ev = &e->xdestroywindow;
 669
 670	if((c = wintoclient(ev->window)))
 671		unmanage(c, True);
 672}
 673
 674void
 675detach(Client *c) {
 676	Client **tc;
 677
 678	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 679	*tc = c->next;
 680}
 681
 682void
 683detachstack(Client *c) {
 684	Client **tc, *t;
 685
 686	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 687	*tc = c->snext;
 688
 689	if(c == c->mon->sel) {
 690		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 691		c->mon->sel = t;
 692	}
 693}
 694
 695void
 696die(const char *errstr, ...) {
 697	va_list ap;
 698
 699	va_start(ap, errstr);
 700	vfprintf(stderr, errstr, ap);
 701	va_end(ap);
 702	exit(EXIT_FAILURE);
 703}
 704
 705Monitor *
 706dirtomon(int dir) {
 707	Monitor *m = NULL;
 708
 709	if(dir > 0) {
 710		if(!(m = selmon->next))
 711			m = mons;
 712	}
 713	else {
 714		if(selmon == mons)
 715			for(m = mons; m->next; m = m->next);
 716		else
 717			for(m = mons; m->next != selmon; m = m->next);
 718	}
 719	return m;
 720}
 721
 722void
 723drawbar(Monitor *m) {
 724	int x;
 725	unsigned int i, occ = 0, urg = 0;
 726	unsigned long *col;
 727	Client *c;
 728
 729	for(c = m->clients; c; c = c->next) {
 730		occ |= c->tags;
 731		if(c->isurgent)
 732			urg |= c->tags;
 733	}
 734	dc.x = 0;
 735	for(i = 0; i < LENGTH(tags); i++) {
 736		dc.w = TEXTW(tags[i]);
 737		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 738		drawtext(tags[i], col, urg & 1 << i);
 739		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 740		           occ & 1 << i, urg & 1 << i, col);
 741		dc.x += dc.w;
 742	}
 743	dc.w = blw = TEXTW(m->ltsymbol);
 744	drawtext(m->ltsymbol, dc.norm, False);
 745	dc.x += dc.w;
 746	x = dc.x;
 747	if(m == selmon) { /* status is only drawn on selected monitor */
 748		dc.w = TEXTW(stext);
 749		dc.x = m->ww - dc.w;
 750		if(dc.x < x) {
 751			dc.x = x;
 752			dc.w = m->ww - x;
 753		}
 754		drawtext(stext, dc.norm, False);
 755	}
 756	else
 757		dc.x = m->ww;
 758	if((dc.w = dc.x - x) > bh) {
 759		dc.x = x;
 760		if(m->sel) {
 761			col = m == selmon ? dc.sel : dc.norm;
 762			drawtext(m->sel->name, col, False);
 763			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 764		}
 765		else
 766			drawtext(NULL, dc.norm, False);
 767	}
 768	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 769	XSync(dpy, False);
 770}
 771
 772void
 773drawbars(void) {
 774	Monitor *m;
 775
 776	for(m = mons; m; m = m->next)
 777		drawbar(m);
 778}
 779
 780void
 781drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 782	int x;
 783
 784	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 785	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 786	if(filled)
 787		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 788	else if(empty)
 789		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 790}
 791
 792void
 793drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 794	char buf[256];
 795	int i, x, y, h, len, olen;
 796
 797	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 798	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 799	if(!text)
 800		return;
 801	olen = strlen(text);
 802	h = dc.font.ascent + dc.font.descent;
 803	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 804	x = dc.x + (h / 2);
 805	/* shorten text if necessary */
 806	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 807	if(!len)
 808		return;
 809	memcpy(buf, text, len);
 810	if(len < olen)
 811		for(i = len; i && i > len - 3; buf[--i] = '.');
 812	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 813	if(dc.font.set)
 814		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 815	else
 816		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 817}
 818
 819void
 820enternotify(XEvent *e) {
 821	Monitor *m;
 822	XCrossingEvent *ev = &e->xcrossing;
 823
 824	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 825		return;
 826	if((m = wintomon(ev->window)) && m != selmon) {
 827		unfocus(selmon->sel, True);
 828		selmon = m;
 829	}
 830	focus((wintoclient(ev->window)));
 831}
 832
 833void
 834expose(XEvent *e) {
 835	Monitor *m;
 836	XExposeEvent *ev = &e->xexpose;
 837
 838	if(ev->count == 0 && (m = wintomon(ev->window)))
 839		drawbar(m);
 840}
 841
 842void
 843focus(Client *c) {
 844	if(!c || !ISVISIBLE(c))
 845		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 846	/* was if(selmon->sel) */
 847	if(selmon->sel && selmon->sel != c)
 848		unfocus(selmon->sel, False);
 849	if(c) {
 850		if(c->mon != selmon)
 851			selmon = c->mon;
 852		if(c->isurgent)
 853			clearurgent(c);
 854		detachstack(c);
 855		attachstack(c);
 856		grabbuttons(c, True);
 857		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 858		setfocus(c);
 859	}
 860	else
 861		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 862	selmon->sel = c;
 863	drawbars();
 864}
 865
 866void
 867focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 868	XFocusChangeEvent *ev = &e->xfocus;
 869
 870	if(selmon->sel && ev->window != selmon->sel->win)
 871		setfocus(selmon->sel);
 872}
 873
 874void
 875focusmon(const Arg *arg) {
 876	Monitor *m;
 877
 878	if(!mons->next)
 879		return;
 880	if((m = dirtomon(arg->i)) == selmon)
 881		return;
 882	unfocus(selmon->sel, True);
 883	selmon = m;
 884	focus(NULL);
 885}
 886
 887void
 888focusstack(const Arg *arg) {
 889	Client *c = NULL, *i;
 890
 891	if(!selmon->sel)
 892		return;
 893	if(arg->i > 0) {
 894		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 895		if(!c)
 896			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 897	}
 898	else {
 899		for(i = selmon->clients; i != selmon->sel; i = i->next)
 900			if(ISVISIBLE(i))
 901				c = i;
 902		if(!c)
 903			for(; i; i = i->next)
 904				if(ISVISIBLE(i))
 905					c = i;
 906	}
 907	if(c) {
 908		focus(c);
 909		restack(selmon);
 910	}
 911}
 912
 913unsigned long
 914getcolor(const char *colstr) {
 915	Colormap cmap = DefaultColormap(dpy, screen);
 916	XColor color;
 917
 918	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 919		die("error, cannot allocate color '%s'\n", colstr);
 920	return color.pixel;
 921}
 922
 923Bool
 924getrootptr(int *x, int *y) {
 925	int di;
 926	unsigned int dui;
 927	Window dummy;
 928
 929	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 930}
 931
 932long
 933getstate(Window w) {
 934	int format;
 935	long result = -1;
 936	unsigned char *p = NULL;
 937	unsigned long n, extra;
 938	Atom real;
 939
 940	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 941	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 942		return -1;
 943	if(n != 0)
 944		result = *p;
 945	XFree(p);
 946	return result;
 947}
 948
 949Bool
 950gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 951	char **list = NULL;
 952	int n;
 953	XTextProperty name;
 954
 955	if(!text || size == 0)
 956		return False;
 957	text[0] = '\0';
 958	XGetTextProperty(dpy, w, &name, atom);
 959	if(!name.nitems)
 960		return False;
 961	if(name.encoding == XA_STRING)
 962		strncpy(text, (char *)name.value, size - 1);
 963	else {
 964		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 965			strncpy(text, *list, size - 1);
 966			XFreeStringList(list);
 967		}
 968	}
 969	text[size - 1] = '\0';
 970	XFree(name.value);
 971	return True;
 972}
 973
 974void
 975grabbuttons(Client *c, Bool focused) {
 976	updatenumlockmask();
 977	{
 978		unsigned int i, j;
 979		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 980		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 981		if(focused) {
 982			for(i = 0; i < LENGTH(buttons); i++)
 983				if(buttons[i].click == ClkClientWin)
 984					for(j = 0; j < LENGTH(modifiers); j++)
 985						XGrabButton(dpy, buttons[i].button,
 986						            buttons[i].mask | modifiers[j],
 987						            c->win, False, BUTTONMASK,
 988						            GrabModeAsync, GrabModeSync, None, None);
 989		}
 990		else
 991			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 992			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 993	}
 994}
 995
 996void
 997grabkeys(void) {
 998	updatenumlockmask();
 999	{
1000		unsigned int i, j;
1001		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1002		KeyCode code;
1003
1004		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1005		for(i = 0; i < LENGTH(keys); i++) {
1006			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1007				for(j = 0; j < LENGTH(modifiers); j++)
1008					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1009						 True, GrabModeAsync, GrabModeAsync);
1010		}
1011	}
1012}
1013
1014void
1015initfont(const char *fontstr) {
1016	char *def, **missing;
1017	int n;
1018
1019	missing = NULL;
1020	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1021	if(missing) {
1022		while(n--)
1023			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1024		XFreeStringList(missing);
1025	}
1026	if(dc.font.set) {
1027		XFontStruct **xfonts;
1028		char **font_names;
1029
1030		dc.font.ascent = dc.font.descent = 0;
1031		XExtentsOfFontSet(dc.font.set);
1032		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1033		while(n--) {
1034			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1035			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1036			xfonts++;
1037		}
1038	}
1039	else {
1040		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1041		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1042			die("error, cannot load font: '%s'\n", fontstr);
1043		dc.font.ascent = dc.font.xfont->ascent;
1044		dc.font.descent = dc.font.xfont->descent;
1045	}
1046	dc.font.height = dc.font.ascent + dc.font.descent;
1047}
1048
1049#ifdef XINERAMA
1050static Bool
1051isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1052	while(n--)
1053		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1054		&& unique[n].width == info->width && unique[n].height == info->height)
1055			return False;
1056	return True;
1057}
1058#endif /* XINERAMA */
1059
1060void
1061keypress(XEvent *e) {
1062	unsigned int i;
1063	KeySym keysym;
1064	XKeyEvent *ev;
1065
1066	ev = &e->xkey;
1067	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1068	for(i = 0; i < LENGTH(keys); i++)
1069		if(keysym == keys[i].keysym
1070		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1071		&& keys[i].func)
1072			keys[i].func(&(keys[i].arg));
1073}
1074
1075void
1076killclient(const Arg *arg) {
1077	if(!selmon->sel)
1078		return;
1079	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1080		XGrabServer(dpy);
1081		XSetErrorHandler(xerrordummy);
1082		XSetCloseDownMode(dpy, DestroyAll);
1083		XKillClient(dpy, selmon->sel->win);
1084		XSync(dpy, False);
1085		XSetErrorHandler(xerror);
1086		XUngrabServer(dpy);
1087	}
1088}
1089
1090void
1091manage(Window w, XWindowAttributes *wa) {
1092	Client *c, *t = NULL;
1093	Window trans = None;
1094	XWindowChanges wc;
1095
1096	if(!(c = calloc(1, sizeof(Client))))
1097		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1098	c->win = w;
1099	updatetitle(c);
1100	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1101		c->mon = t->mon;
1102		c->tags = t->tags;
1103	}
1104	else {
1105		c->mon = selmon;
1106		applyrules(c);
1107	}
1108	/* geometry */
1109	c->x = c->oldx = wa->x + c->mon->wx;
1110	c->y = c->oldy = wa->y + c->mon->wy;
1111	c->w = c->oldw = wa->width;
1112	c->h = c->oldh = wa->height;
1113	c->oldbw = wa->border_width;
1114	if(c->w == c->mon->mw && c->h == c->mon->mh) {
1115		c->isfloating = True;
1116		c->x = c->mon->mx;
1117		c->y = c->mon->my;
1118		c->bw = 0;
1119	}
1120	else {
1121		if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1122			c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1123		if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1124			c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1125		c->x = MAX(c->x, c->mon->mx);
1126		/* only fix client y-offset, if the client center might cover the bar */
1127		c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1128		           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1129		c->bw = borderpx;
1130	}
1131	wc.border_width = c->bw;
1132	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1133	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1134	configure(c); /* propagates border_width, if size doesn't change */
1135	updatesizehints(c);
1136	updatewmhints(c);
1137	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1138	grabbuttons(c, False);
1139	if(!c->isfloating)
1140		c->isfloating = c->oldstate = trans != None || c->isfixed;
1141	if(c->isfloating)
1142		XRaiseWindow(dpy, c->win);
1143	attach(c);
1144	attachstack(c);
1145	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1146	XMapWindow(dpy, c->win);
1147	setclientstate(c, NormalState);
1148	arrange(c->mon);
1149}
1150
1151void
1152mappingnotify(XEvent *e) {
1153	XMappingEvent *ev = &e->xmapping;
1154
1155	XRefreshKeyboardMapping(ev);
1156	if(ev->request == MappingKeyboard)
1157		grabkeys();
1158}
1159
1160void
1161maprequest(XEvent *e) {
1162	static XWindowAttributes wa;
1163	XMapRequestEvent *ev = &e->xmaprequest;
1164
1165	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1166		return;
1167	if(wa.override_redirect)
1168		return;
1169	if(!wintoclient(ev->window))
1170		manage(ev->window, &wa);
1171}
1172
1173void
1174monocle(Monitor *m) {
1175	unsigned int n = 0;
1176	Client *c;
1177
1178	for(c = m->clients; c; c = c->next)
1179		if(ISVISIBLE(c))
1180			n++;
1181	if(n > 0) /* override layout symbol */
1182		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1183	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1184		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1185}
1186
1187void
1188movemouse(const Arg *arg) {
1189	int x, y, ocx, ocy, nx, ny;
1190	Client *c;
1191	Monitor *m;
1192	XEvent ev;
1193
1194	if(!(c = selmon->sel))
1195		return;
1196	restack(selmon);
1197	ocx = c->x;
1198	ocy = c->y;
1199	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1200	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1201		return;
1202	if(!getrootptr(&x, &y))
1203		return;
1204	do {
1205		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1206		switch(ev.type) {
1207		case ConfigureRequest:
1208		case Expose:
1209		case MapRequest:
1210			handler[ev.type](&ev);
1211			break;
1212		case MotionNotify:
1213			nx = ocx + (ev.xmotion.x - x);
1214			ny = ocy + (ev.xmotion.y - y);
1215			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1216			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1217				if(abs(selmon->wx - nx) < snap)
1218					nx = selmon->wx;
1219				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1220					nx = selmon->wx + selmon->ww - WIDTH(c);
1221				if(abs(selmon->wy - ny) < snap)
1222					ny = selmon->wy;
1223				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1224					ny = selmon->wy + selmon->wh - HEIGHT(c);
1225				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1226				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1227					togglefloating(NULL);
1228			}
1229			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1230				resize(c, nx, ny, c->w, c->h, True);
1231			break;
1232		}
1233	} while(ev.type != ButtonRelease);
1234	XUngrabPointer(dpy, CurrentTime);
1235	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1236		sendmon(c, m);
1237		selmon = m;
1238		focus(NULL);
1239	}
1240}
1241
1242Client *
1243nexttiled(Client *c) {
1244	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1245	return c;
1246}
1247
1248void
1249pop(Client *c) {
1250	detach(c);
1251	attach(c);
1252	focus(c);
1253	arrange(c->mon);
1254}
1255
1256void
1257propertynotify(XEvent *e) {
1258	Client *c;
1259	Window trans;
1260	XPropertyEvent *ev = &e->xproperty;
1261
1262	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1263		updatestatus();
1264	else if(ev->state == PropertyDelete)
1265		return; /* ignore */
1266	else if((c = wintoclient(ev->window))) {
1267		switch(ev->atom) {
1268		default: break;
1269		case XA_WM_TRANSIENT_FOR:
1270			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1271			   (c->isfloating = (wintoclient(trans)) != NULL))
1272				arrange(c->mon);
1273			break;
1274		case XA_WM_NORMAL_HINTS:
1275			updatesizehints(c);
1276			break;
1277		case XA_WM_HINTS:
1278			updatewmhints(c);
1279			drawbars();
1280			break;
1281		}
1282		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1283			updatetitle(c);
1284			if(c == c->mon->sel)
1285				drawbar(c->mon);
1286		}
1287	}
1288}
1289
1290Monitor *
1291ptrtomon(int x, int y) {
1292	Monitor *m;
1293
1294	for(m = mons; m; m = m->next)
1295		if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1296			return m;
1297	return selmon;
1298}
1299void
1300quit(const Arg *arg) {
1301	running = False;
1302}
1303
1304void
1305resize(Client *c, int x, int y, int w, int h, Bool interact) {
1306	if(applysizehints(c, &x, &y, &w, &h, interact))
1307		resizeclient(c, x, y, w, h);
1308}
1309
1310void
1311resizeclient(Client *c, int x, int y, int w, int h) {
1312	XWindowChanges wc;
1313
1314	c->oldx = c->x; c->x = wc.x = x;
1315	c->oldy = c->y; c->y = wc.y = y;
1316	c->oldw = c->w; c->w = wc.width = w;
1317	c->oldh = c->h; c->h = wc.height = h;
1318	wc.border_width = c->bw;
1319	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1320	configure(c);
1321	XSync(dpy, False);
1322}
1323
1324void
1325resizemouse(const Arg *arg) {
1326	int ocx, ocy;
1327	int nw, nh;
1328	Client *c;
1329	Monitor *m;
1330	XEvent ev;
1331
1332	if(!(c = selmon->sel))
1333		return;
1334	restack(selmon);
1335	ocx = c->x;
1336	ocy = c->y;
1337	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1338	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1339		return;
1340	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1341	do {
1342		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1343		switch(ev.type) {
1344		case ConfigureRequest:
1345		case Expose:
1346		case MapRequest:
1347			handler[ev.type](&ev);
1348			break;
1349		case MotionNotify:
1350			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1351			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1352			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1353			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1354			{
1355				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1356				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1357					togglefloating(NULL);
1358			}
1359			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1360				resize(c, c->x, c->y, nw, nh, True);
1361			break;
1362		}
1363	} while(ev.type != ButtonRelease);
1364	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1365	XUngrabPointer(dpy, CurrentTime);
1366	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1367	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1368		sendmon(c, m);
1369		selmon = m;
1370		focus(NULL);
1371	}
1372}
1373
1374void
1375restack(Monitor *m) {
1376	Client *c;
1377	XEvent ev;
1378	XWindowChanges wc;
1379
1380	drawbar(m);
1381	if(!m->sel)
1382		return;
1383	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1384		XRaiseWindow(dpy, m->sel->win);
1385	if(m->lt[m->sellt]->arrange) {
1386		wc.stack_mode = Below;
1387		wc.sibling = m->barwin;
1388		for(c = m->stack; c; c = c->snext)
1389			if(!c->isfloating && ISVISIBLE(c)) {
1390				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1391				wc.sibling = c->win;
1392			}
1393	}
1394	XSync(dpy, False);
1395	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1396}
1397
1398void
1399run(void) {
1400	XEvent ev;
1401	/* main event loop */
1402	XSync(dpy, False);
1403	while(running && !XNextEvent(dpy, &ev)) {
1404		if(handler[ev.type])
1405			handler[ev.type](&ev); /* call handler */
1406	}
1407}
1408
1409void
1410scan(void) {
1411	unsigned int i, num;
1412	Window d1, d2, *wins = NULL;
1413	XWindowAttributes wa;
1414
1415	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1416		for(i = 0; i < num; i++) {
1417			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1418			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1419				continue;
1420			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1421				manage(wins[i], &wa);
1422		}
1423		for(i = 0; i < num; i++) { /* now the transients */
1424			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1425				continue;
1426			if(XGetTransientForHint(dpy, wins[i], &d1)
1427			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1428				manage(wins[i], &wa);
1429		}
1430		if(wins)
1431			XFree(wins);
1432	}
1433}
1434
1435void
1436sendmon(Client *c, Monitor *m) {
1437	if(c->mon == m)
1438		return;
1439	unfocus(c, True);
1440	detach(c);
1441	detachstack(c);
1442	c->mon = m;
1443	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1444	attach(c);
1445	attachstack(c);
1446	focus(NULL);
1447	arrange(NULL);
1448}
1449
1450void
1451setclientstate(Client *c, long state) {
1452	long data[] = { state, None };
1453
1454	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1455			PropModeReplace, (unsigned char *)data, 2);
1456}
1457
1458Bool
1459sendevent(Client *c, Atom proto) {
1460	int n;
1461	Atom *protocols;
1462	Bool exists = False;
1463	XEvent ev;
1464
1465	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1466		while(!exists && n--)
1467			exists = protocols[n] == proto;
1468		XFree(protocols);
1469	}
1470	if(exists) {
1471		ev.type = ClientMessage;
1472		ev.xclient.window = c->win;
1473		ev.xclient.message_type = wmatom[WMProtocols];
1474		ev.xclient.format = 32;
1475		ev.xclient.data.l[0] = proto;
1476		ev.xclient.data.l[1] = CurrentTime;
1477		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1478	}
1479	return exists;
1480}
1481
1482void
1483setfocus(Client *c) {
1484	if(!c->neverfocus)
1485		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1486	sendevent(c, wmatom[WMTakeFocus]);
1487}
1488
1489void
1490setlayout(const Arg *arg) {
1491	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1492		selmon->sellt ^= 1;
1493	if(arg && arg->v)
1494		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1495	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1496	if(selmon->sel)
1497		arrange(selmon);
1498	else
1499		drawbar(selmon);
1500}
1501
1502/* arg > 1.0 will set mfact absolutly */
1503void
1504setmfact(const Arg *arg) {
1505	float f;
1506
1507	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1508		return;
1509	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1510	if(f < 0.1 || f > 0.9)
1511		return;
1512	selmon->mfact = f;
1513	arrange(selmon);
1514}
1515
1516void
1517setup(void) {
1518	XSetWindowAttributes wa;
1519
1520	/* clean up any zombies immediately */
1521	sigchld(0);
1522
1523	/* init screen */
1524	screen = DefaultScreen(dpy);
1525	root = RootWindow(dpy, screen);
1526	initfont(font);
1527	sw = DisplayWidth(dpy, screen);
1528	sh = DisplayHeight(dpy, screen);
1529	bh = dc.h = dc.font.height + 2;
1530	updategeom();
1531	/* init atoms */
1532	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1533	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1534	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1535	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1536	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1537	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1538	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1539	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1540	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1541	/* init cursors */
1542	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1543	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1544	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1545	/* init appearance */
1546	dc.norm[ColBorder] = getcolor(normbordercolor);
1547	dc.norm[ColBG] = getcolor(normbgcolor);
1548	dc.norm[ColFG] = getcolor(normfgcolor);
1549	dc.sel[ColBorder] = getcolor(selbordercolor);
1550	dc.sel[ColBG] = getcolor(selbgcolor);
1551	dc.sel[ColFG] = getcolor(selfgcolor);
1552	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1553	dc.gc = XCreateGC(dpy, root, 0, NULL);
1554	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1555	if(!dc.font.set)
1556		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1557	/* init bars */
1558	updatebars();
1559	updatestatus();
1560	/* EWMH support per view */
1561	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1562			PropModeReplace, (unsigned char *) netatom, NetLast);
1563	/* select for events */
1564	wa.cursor = cursor[CurNormal];
1565	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1566	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1567	                |PropertyChangeMask;
1568	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1569	XSelectInput(dpy, root, wa.event_mask);
1570	grabkeys();
1571}
1572
1573void
1574showhide(Client *c) {
1575	if(!c)
1576		return;
1577	if(ISVISIBLE(c)) { /* show clients top down */
1578		XMoveWindow(dpy, c->win, c->x, c->y);
1579		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1580			resize(c, c->x, c->y, c->w, c->h, False);
1581		showhide(c->snext);
1582	}
1583	else { /* hide clients bottom up */
1584		showhide(c->snext);
1585		XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1586	}
1587}
1588
1589void
1590sigchld(int unused) {
1591	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1592		die("Can't install SIGCHLD handler");
1593	while(0 < waitpid(-1, NULL, WNOHANG));
1594}
1595
1596void
1597spawn(const Arg *arg) {
1598	if(fork() == 0) {
1599		if(dpy)
1600			close(ConnectionNumber(dpy));
1601		setsid();
1602		execvp(((char **)arg->v)[0], (char **)arg->v);
1603		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1604		perror(" failed");
1605		exit(EXIT_SUCCESS);
1606	}
1607}
1608
1609void
1610tag(const Arg *arg) {
1611	if(selmon->sel && arg->ui & TAGMASK) {
1612		selmon->sel->tags = arg->ui & TAGMASK;
1613		arrange(selmon);
1614	}
1615}
1616
1617void
1618tagmon(const Arg *arg) {
1619	if(!selmon->sel || !mons->next)
1620		return;
1621	sendmon(selmon->sel, dirtomon(arg->i));
1622}
1623
1624int
1625textnw(const char *text, unsigned int len) {
1626	XRectangle r;
1627
1628	if(dc.font.set) {
1629		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1630		return r.width;
1631	}
1632	return XTextWidth(dc.font.xfont, text, len);
1633}
1634
1635void
1636tile(Monitor *m) {
1637	int x, y, h, w, mw;
1638	unsigned int i, n;
1639	Client *c;
1640
1641	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1642	if(n == 0)
1643		return;
1644	/* master */
1645	c = nexttiled(m->clients);
1646	mw = m->mfact * m->ww;
1647	resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1648	if(--n == 0)
1649		return;
1650	/* tile stack */
1651	x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1652	y = m->wy;
1653	w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1654	h = m->wh / n;
1655	if(h < bh)
1656		h = m->wh;
1657	for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1658		resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1659		       ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1660		if(h != m->wh)
1661			y = c->y + HEIGHT(c);
1662	}
1663}
1664
1665void
1666togglebar(const Arg *arg) {
1667	selmon->showbar = !selmon->showbar;
1668	updatebarpos(selmon);
1669	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1670	arrange(selmon);
1671}
1672
1673void
1674togglefloating(const Arg *arg) {
1675	if(!selmon->sel)
1676		return;
1677	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1678	if(selmon->sel->isfloating)
1679		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1680		       selmon->sel->w, selmon->sel->h, False);
1681	arrange(selmon);
1682}
1683
1684void
1685toggletag(const Arg *arg) {
1686	unsigned int newtags;
1687
1688	if(!selmon->sel)
1689		return;
1690	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1691	if(newtags) {
1692		selmon->sel->tags = newtags;
1693		arrange(selmon);
1694	}
1695}
1696
1697void
1698toggleview(const Arg *arg) {
1699	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1700
1701	if(newtagset) {
1702		selmon->tagset[selmon->seltags] = newtagset;
1703		arrange(selmon);
1704	}
1705}
1706
1707void
1708unfocus(Client *c, Bool setfocus) {
1709	if(!c)
1710		return;
1711	grabbuttons(c, False);
1712	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1713	if(setfocus)
1714		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1715}
1716
1717void
1718unmanage(Client *c, Bool destroyed) {
1719	Monitor *m = c->mon;
1720	XWindowChanges wc;
1721
1722	/* The server grab construct avoids race conditions. */
1723	detach(c);
1724	detachstack(c);
1725	if(!destroyed) {
1726		wc.border_width = c->oldbw;
1727		XGrabServer(dpy);
1728		XSetErrorHandler(xerrordummy);
1729		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1730		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1731		setclientstate(c, WithdrawnState);
1732		XSync(dpy, False);
1733		XSetErrorHandler(xerror);
1734		XUngrabServer(dpy);
1735	}
1736	free(c);
1737	focus(NULL);
1738	arrange(m);
1739}
1740
1741void
1742unmapnotify(XEvent *e) {
1743	Client *c;
1744	XUnmapEvent *ev = &e->xunmap;
1745
1746	if((c = wintoclient(ev->window)))
1747		unmanage(c, False);
1748}
1749
1750void
1751updatebars(void) {
1752	Monitor *m;
1753	XSetWindowAttributes wa = {
1754		.override_redirect = True,
1755		.background_pixmap = ParentRelative,
1756		.event_mask = ButtonPressMask|ExposureMask
1757	};
1758	for(m = mons; m; m = m->next) {
1759		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1760		                          CopyFromParent, DefaultVisual(dpy, screen),
1761		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1762		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1763		XMapRaised(dpy, m->barwin);
1764	}
1765}
1766
1767void
1768updatebarpos(Monitor *m) {
1769	m->wy = m->my;
1770	m->wh = m->mh;
1771	if(m->showbar) {
1772		m->wh -= bh;
1773		m->by = m->topbar ? m->wy : m->wy + m->wh;
1774		m->wy = m->topbar ? m->wy + bh : m->wy;
1775	}
1776	else
1777		m->by = -bh;
1778}
1779
1780Bool
1781updategeom(void) {
1782	Bool dirty = False;
1783
1784#ifdef XINERAMA
1785	if(XineramaIsActive(dpy)) {
1786		int i, j, n, nn;
1787		Client *c;
1788		Monitor *m;
1789		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1790		XineramaScreenInfo *unique = NULL;
1791
1792		for(n = 0, m = mons; m; m = m->next, n++);
1793		/* only consider unique geometries as separate screens */
1794		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1795			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1796		for(i = 0, j = 0; i < nn; i++)
1797			if(isuniquegeom(unique, j, &info[i]))
1798				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1799		XFree(info);
1800		nn = j;
1801		if(n <= nn) {
1802			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1803				for(m = mons; m && m->next; m = m->next);
1804				if(m)
1805					m->next = createmon();
1806				else
1807					mons = createmon();
1808			}
1809			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1810				if(i >= n
1811				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1812				    || unique[i].width != m->mw || unique[i].height != m->mh))
1813				{
1814					dirty = True;
1815					m->num = i;
1816					m->mx = m->wx = unique[i].x_org;
1817					m->my = m->wy = unique[i].y_org;
1818					m->mw = m->ww = unique[i].width;
1819					m->mh = m->wh = unique[i].height;
1820					updatebarpos(m);
1821				}
1822		}
1823		else { /* less monitors available nn < n */
1824			for(i = nn; i < n; i++) {
1825				for(m = mons; m && m->next; m = m->next);
1826				while(m->clients) {
1827					dirty = True;
1828					c = m->clients;
1829					m->clients = c->next;
1830					detachstack(c);
1831					c->mon = mons;
1832					attach(c);
1833					attachstack(c);
1834				}
1835				if(m == selmon)
1836					selmon = mons;
1837				cleanupmon(m);
1838			}
1839		}
1840		free(unique);
1841	}
1842	else
1843#endif /* XINERAMA */
1844	/* default monitor setup */
1845	{
1846		if(!mons)
1847			mons = createmon();
1848		if(mons->mw != sw || mons->mh != sh) {
1849			dirty = True;
1850			mons->mw = mons->ww = sw;
1851			mons->mh = mons->wh = sh;
1852			updatebarpos(mons);
1853		}
1854	}
1855	if(dirty) {
1856		selmon = mons;
1857		selmon = wintomon(root);
1858	}
1859	return dirty;
1860}
1861
1862void
1863updatenumlockmask(void) {
1864	unsigned int i, j;
1865	XModifierKeymap *modmap;
1866
1867	numlockmask = 0;
1868	modmap = XGetModifierMapping(dpy);
1869	for(i = 0; i < 8; i++)
1870		for(j = 0; j < modmap->max_keypermod; j++)
1871			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1872			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1873				numlockmask = (1 << i);
1874	XFreeModifiermap(modmap);
1875}
1876
1877void
1878updatesizehints(Client *c) {
1879	long msize;
1880	XSizeHints size;
1881
1882	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1883		/* size is uninitialized, ensure that size.flags aren't used */
1884		size.flags = PSize;
1885	if(size.flags & PBaseSize) {
1886		c->basew = size.base_width;
1887		c->baseh = size.base_height;
1888	}
1889	else if(size.flags & PMinSize) {
1890		c->basew = size.min_width;
1891		c->baseh = size.min_height;
1892	}
1893	else
1894		c->basew = c->baseh = 0;
1895	if(size.flags & PResizeInc) {
1896		c->incw = size.width_inc;
1897		c->inch = size.height_inc;
1898	}
1899	else
1900		c->incw = c->inch = 0;
1901	if(size.flags & PMaxSize) {
1902		c->maxw = size.max_width;
1903		c->maxh = size.max_height;
1904	}
1905	else
1906		c->maxw = c->maxh = 0;
1907	if(size.flags & PMinSize) {
1908		c->minw = size.min_width;
1909		c->minh = size.min_height;
1910	}
1911	else if(size.flags & PBaseSize) {
1912		c->minw = size.base_width;
1913		c->minh = size.base_height;
1914	}
1915	else
1916		c->minw = c->minh = 0;
1917	if(size.flags & PAspect) {
1918		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1919		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1920	}
1921	else
1922		c->maxa = c->mina = 0.0;
1923	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1924	             && c->maxw == c->minw && c->maxh == c->minh);
1925}
1926
1927void
1928updatetitle(Client *c) {
1929	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1930		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1931	if(c->name[0] == '\0') /* hack to mark broken clients */
1932		strcpy(c->name, broken);
1933}
1934
1935void
1936updatestatus(void) {
1937	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1938		strcpy(stext, "dwm-"VERSION);
1939	drawbar(selmon);
1940}
1941
1942void
1943updatewmhints(Client *c) {
1944	XWMHints *wmh;
1945
1946	if((wmh = XGetWMHints(dpy, c->win))) {
1947		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1948			wmh->flags &= ~XUrgencyHint;
1949			XSetWMHints(dpy, c->win, wmh);
1950		}
1951		else
1952			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1953		if(wmh->flags & InputHint)
1954			c->neverfocus = !wmh->input;
1955		else
1956			c->neverfocus = False;
1957		XFree(wmh);
1958	}
1959}
1960
1961void
1962view(const Arg *arg) {
1963	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1964		return;
1965	selmon->seltags ^= 1; /* toggle sel tagset */
1966	if(arg->ui & TAGMASK)
1967		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1968	arrange(selmon);
1969}
1970
1971Client *
1972wintoclient(Window w) {
1973	Client *c;
1974	Monitor *m;
1975
1976	for(m = mons; m; m = m->next)
1977		for(c = m->clients; c; c = c->next)
1978			if(c->win == w)
1979				return c;
1980	return NULL;
1981}
1982
1983Monitor *
1984wintomon(Window w) {
1985	int x, y;
1986	Client *c;
1987	Monitor *m;
1988
1989	if(w == root && getrootptr(&x, &y))
1990		return ptrtomon(x, y);
1991	for(m = mons; m; m = m->next)
1992		if(w == m->barwin)
1993			return m;
1994	if((c = wintoclient(w)))
1995		return c->mon;
1996	return selmon;
1997}
1998
1999/* There's no way to check accesses to destroyed windows, thus those cases are
2000 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2001 * default error handler, which may call exit.  */
2002int
2003xerror(Display *dpy, XErrorEvent *ee) {
2004	if(ee->error_code == BadWindow
2005	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2006	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2007	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2008	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2009	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2010	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2011	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2012	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2013		return 0;
2014	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2015			ee->request_code, ee->error_code);
2016	return xerrorxlib(dpy, ee); /* may call exit */
2017}
2018
2019int
2020xerrordummy(Display *dpy, XErrorEvent *ee) {
2021	return 0;
2022}
2023
2024/* Startup Error handler to check if another window manager
2025 * is already running. */
2026int
2027xerrorstart(Display *dpy, XErrorEvent *ee) {
2028	die("dwm: another window manager is already running\n");
2029	return -1;
2030}
2031
2032void
2033zoom(const Arg *arg) {
2034	Client *c = selmon->sel;
2035
2036	if(!selmon->lt[selmon->sellt]->arrange
2037	|| selmon->lt[selmon->sellt]->arrange == monocle
2038	|| (selmon->sel && selmon->sel->isfloating))
2039		return;
2040	if(c == nexttiled(selmon->clients))
2041		if(!c || !(c = nexttiled(c->next)))
2042			return;
2043	pop(c);
2044}
2045
2046int
2047main(int argc, char *argv[]) {
2048	if(argc == 2 && !strcmp("-v", argv[1]))
2049		die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2050	else if(argc != 1)
2051		die("usage: dwm [-v]\n");
2052	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2053		fputs("warning: no locale support\n", stderr);
2054	if(!(dpy = XOpenDisplay(NULL)))
2055		die("dwm: cannot open display\n");
2056	checkotherwm();
2057	setup();
2058	scan();
2059	run();
2060	cleanup();
2061	XCloseDisplay(dpy);
2062	return EXIT_SUCCESS;
2063}