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#include "drw.h"
  44#include "util.h"
  45
  46/* macros */
  47#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  48#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  49#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  50                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  51#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  52#define LENGTH(X)               (sizeof X / sizeof X[0])
  53#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  54#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  55#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  56#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  57#define TEXTW(X)                (drw_font_getexts_width(drw->font, X, strlen(X)) + drw->font->h)
  58
  59/* enums */
  60enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  61enum { SchemeNorm, SchemeSel, SchemeLast }; /* color schemes */
  62enum { NetSupported, NetWMName, NetWMState,
  63       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  64       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  65enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  66enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  67       ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  68
  69typedef union {
  70	int i;
  71	unsigned int ui;
  72	float f;
  73	const void *v;
  74} Arg;
  75
  76typedef struct {
  77	unsigned int click;
  78	unsigned int mask;
  79	unsigned int button;
  80	void (*func)(const Arg *arg);
  81	const Arg arg;
  82} Button;
  83
  84typedef struct Monitor Monitor;
  85typedef struct Client Client;
  86struct Client {
  87	char name[256];
  88	float mina, maxa;
  89	int x, y, w, h;
  90	int oldx, oldy, oldw, oldh;
  91	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  92	int bw, oldbw;
  93	unsigned int tags;
  94	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  95	Client *next;
  96	Client *snext;
  97	Monitor *mon;
  98	Window win;
  99};
 100
 101typedef struct {
 102	unsigned int mod;
 103	KeySym keysym;
 104	void (*func)(const Arg *);
 105	const Arg arg;
 106} Key;
 107
 108typedef struct {
 109	const char *symbol;
 110	void (*arrange)(Monitor *);
 111} Layout;
 112
 113struct Monitor {
 114	char ltsymbol[16];
 115	float mfact;
 116	int nmaster;
 117	int num;
 118	int by;               /* bar geometry */
 119	int mx, my, mw, mh;   /* screen size */
 120	int wx, wy, ww, wh;   /* window area  */
 121	unsigned int seltags;
 122	unsigned int sellt;
 123	unsigned int tagset[2];
 124	Bool showbar;
 125	Bool topbar;
 126	Client *clients;
 127	Client *sel;
 128	Client *stack;
 129	Monitor *next;
 130	Window barwin;
 131	const Layout *lt[2];
 132};
 133
 134typedef struct {
 135	const char *class;
 136	const char *instance;
 137	const char *title;
 138	unsigned int tags;
 139	Bool isfloating;
 140	int monitor;
 141} Rule;
 142
 143/* function declarations */
 144static void applyrules(Client *c);
 145static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 146static void arrange(Monitor *m);
 147static void arrangemon(Monitor *m);
 148static void attach(Client *c);
 149static void attachstack(Client *c);
 150static void buttonpress(XEvent *e);
 151static void checkotherwm(void);
 152static void cleanup(void);
 153static void cleanupmon(Monitor *mon);
 154static void clearurgent(Client *c);
 155static void clientmessage(XEvent *e);
 156static void configure(Client *c);
 157static void configurenotify(XEvent *e);
 158static void configurerequest(XEvent *e);
 159static Monitor *createmon(void);
 160static void destroynotify(XEvent *e);
 161static void detach(Client *c);
 162static void detachstack(Client *c);
 163static Monitor *dirtomon(int dir);
 164static void drawbar(Monitor *m);
 165static void drawbars(void);
 166static void enternotify(XEvent *e);
 167static void expose(XEvent *e);
 168static void focus(Client *c);
 169static void focusin(XEvent *e);
 170static void focusmon(const Arg *arg);
 171static void focusstack(const Arg *arg);
 172static Bool getrootptr(int *x, int *y);
 173static long getstate(Window w);
 174static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 175static void grabbuttons(Client *c, Bool focused);
 176static void grabkeys(void);
 177static void incnmaster(const Arg *arg);
 178static void keypress(XEvent *e);
 179static void killclient(const Arg *arg);
 180static void manage(Window w, XWindowAttributes *wa);
 181static void mappingnotify(XEvent *e);
 182static void maprequest(XEvent *e);
 183static void monocle(Monitor *m);
 184static void motionnotify(XEvent *e);
 185static void movemouse(const Arg *arg);
 186static Client *nexttiled(Client *c);
 187static void pop(Client *);
 188static void propertynotify(XEvent *e);
 189static void quit(const Arg *arg);
 190static Monitor *recttomon(int x, int y, int w, int h);
 191static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 192static void resizeclient(Client *c, int x, int y, int w, int h);
 193static void resizemouse(const Arg *arg);
 194static void restack(Monitor *m);
 195static void run(void);
 196static void scan(void);
 197static Bool sendevent(Client *c, Atom proto);
 198static void sendmon(Client *c, Monitor *m);
 199static void setclientstate(Client *c, long state);
 200static void setfocus(Client *c);
 201static void setfullscreen(Client *c, Bool fullscreen);
 202static void setlayout(const Arg *arg);
 203static void setmfact(const Arg *arg);
 204static void setup(void);
 205static void showhide(Client *c);
 206static void sigchld(int unused);
 207static void spawn(const Arg *arg);
 208static void tag(const Arg *arg);
 209static void tagmon(const Arg *arg);
 210static void tile(Monitor *);
 211static void togglebar(const Arg *arg);
 212static void togglefloating(const Arg *arg);
 213static void toggletag(const Arg *arg);
 214static void toggleview(const Arg *arg);
 215static void unfocus(Client *c, Bool setfocus);
 216static void unmanage(Client *c, Bool destroyed);
 217static void unmapnotify(XEvent *e);
 218static Bool updategeom(void);
 219static void updatebarpos(Monitor *m);
 220static void updatebars(void);
 221static void updateclientlist(void);
 222static void updatenumlockmask(void);
 223static void updatesizehints(Client *c);
 224static void updatestatus(void);
 225static void updatewindowtype(Client *c);
 226static void updatetitle(Client *c);
 227static void updatewmhints(Client *c);
 228static void view(const Arg *arg);
 229static Client *wintoclient(Window w);
 230static Monitor *wintomon(Window w);
 231static int xerror(Display *dpy, XErrorEvent *ee);
 232static int xerrordummy(Display *dpy, XErrorEvent *ee);
 233static int xerrorstart(Display *dpy, XErrorEvent *ee);
 234static void zoom(const Arg *arg);
 235
 236/* variables */
 237static const char broken[] = "broken";
 238static char stext[256];
 239static int screen;
 240static int sw, sh;           /* X display screen geometry width, height */
 241static int bh, blw = 0;      /* bar geometry */
 242static int (*xerrorxlib)(Display *, XErrorEvent *);
 243static unsigned int numlockmask = 0;
 244static void (*handler[LASTEvent]) (XEvent *) = {
 245	[ButtonPress] = buttonpress,
 246	[ClientMessage] = clientmessage,
 247	[ConfigureRequest] = configurerequest,
 248	[ConfigureNotify] = configurenotify,
 249	[DestroyNotify] = destroynotify,
 250	[EnterNotify] = enternotify,
 251	[Expose] = expose,
 252	[FocusIn] = focusin,
 253	[KeyPress] = keypress,
 254	[MappingNotify] = mappingnotify,
 255	[MapRequest] = maprequest,
 256	[MotionNotify] = motionnotify,
 257	[PropertyNotify] = propertynotify,
 258	[UnmapNotify] = unmapnotify
 259};
 260static Atom wmatom[WMLast], netatom[NetLast];
 261static Bool running = True;
 262static Cur *cursor[CurLast];
 263static ClrScheme scheme[SchemeLast];
 264static Display *dpy;
 265static Drw *drw;
 266static Fnt *fnt;
 267static Monitor *mons, *selmon;
 268static Window root;
 269
 270/* configuration, allows nested code to access above variables */
 271#include "config.h"
 272
 273/* compile-time check if all tags fit into an unsigned int bit array. */
 274struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 275
 276/* function implementations */
 277void
 278applyrules(Client *c) {
 279	const char *class, *instance;
 280	unsigned int i;
 281	const Rule *r;
 282	Monitor *m;
 283	XClassHint ch = { NULL, NULL };
 284
 285	/* rule matching */
 286	c->isfloating = c->tags = 0;
 287	XGetClassHint(dpy, c->win, &ch);
 288	class    = ch.res_class ? ch.res_class : broken;
 289	instance = ch.res_name  ? ch.res_name  : broken;
 290
 291	for(i = 0; i < LENGTH(rules); i++) {
 292		r = &rules[i];
 293		if((!r->title || strstr(c->name, r->title))
 294		&& (!r->class || strstr(class, r->class))
 295		&& (!r->instance || strstr(instance, r->instance)))
 296		{
 297			c->isfloating = r->isfloating;
 298			c->tags |= r->tags;
 299			for(m = mons; m && m->num != r->monitor; m = m->next);
 300			if(m)
 301				c->mon = m;
 302		}
 303	}
 304	if(ch.res_class)
 305		XFree(ch.res_class);
 306	if(ch.res_name)
 307		XFree(ch.res_name);
 308	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 309}
 310
 311Bool
 312applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 313	Bool baseismin;
 314	Monitor *m = c->mon;
 315
 316	/* set minimum possible */
 317	*w = MAX(1, *w);
 318	*h = MAX(1, *h);
 319	if(interact) {
 320		if(*x > sw)
 321			*x = sw - WIDTH(c);
 322		if(*y > sh)
 323			*y = sh - HEIGHT(c);
 324		if(*x + *w + 2 * c->bw < 0)
 325			*x = 0;
 326		if(*y + *h + 2 * c->bw < 0)
 327			*y = 0;
 328	}
 329	else {
 330		if(*x >= m->wx + m->ww)
 331			*x = m->wx + m->ww - WIDTH(c);
 332		if(*y >= m->wy + m->wh)
 333			*y = m->wy + m->wh - HEIGHT(c);
 334		if(*x + *w + 2 * c->bw <= m->wx)
 335			*x = m->wx;
 336		if(*y + *h + 2 * c->bw <= m->wy)
 337			*y = m->wy;
 338	}
 339	if(*h < bh)
 340		*h = bh;
 341	if(*w < bh)
 342		*w = bh;
 343	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 344		/* see last two sentences in ICCCM 4.1.2.3 */
 345		baseismin = c->basew == c->minw && c->baseh == c->minh;
 346		if(!baseismin) { /* temporarily remove base dimensions */
 347			*w -= c->basew;
 348			*h -= c->baseh;
 349		}
 350		/* adjust for aspect limits */
 351		if(c->mina > 0 && c->maxa > 0) {
 352			if(c->maxa < (float)*w / *h)
 353				*w = *h * c->maxa + 0.5;
 354			else if(c->mina < (float)*h / *w)
 355				*h = *w * c->mina + 0.5;
 356		}
 357		if(baseismin) { /* increment calculation requires this */
 358			*w -= c->basew;
 359			*h -= c->baseh;
 360		}
 361		/* adjust for increment value */
 362		if(c->incw)
 363			*w -= *w % c->incw;
 364		if(c->inch)
 365			*h -= *h % c->inch;
 366		/* restore base dimensions */
 367		*w = MAX(*w + c->basew, c->minw);
 368		*h = MAX(*h + c->baseh, c->minh);
 369		if(c->maxw)
 370			*w = MIN(*w, c->maxw);
 371		if(c->maxh)
 372			*h = MIN(*h, c->maxh);
 373	}
 374	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 375}
 376
 377void
 378arrange(Monitor *m) {
 379	if(m)
 380		showhide(m->stack);
 381	else for(m = mons; m; m = m->next)
 382		showhide(m->stack);
 383	if(m) {
 384		arrangemon(m);
 385		restack(m);
 386	} else for(m = mons; m; m = m->next)
 387		arrangemon(m);
 388}
 389
 390void
 391arrangemon(Monitor *m) {
 392	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 393	if(m->lt[m->sellt]->arrange)
 394		m->lt[m->sellt]->arrange(m);
 395}
 396
 397void
 398attach(Client *c) {
 399	c->next = c->mon->clients;
 400	c->mon->clients = c;
 401}
 402
 403void
 404attachstack(Client *c) {
 405	c->snext = c->mon->stack;
 406	c->mon->stack = c;
 407}
 408
 409void
 410buttonpress(XEvent *e) {
 411	unsigned int i, x, click;
 412	Arg arg = {0};
 413	Client *c;
 414	Monitor *m;
 415	XButtonPressedEvent *ev = &e->xbutton;
 416
 417	click = ClkRootWin;
 418	/* focus monitor if necessary */
 419	if((m = wintomon(ev->window)) && m != selmon) {
 420		unfocus(selmon->sel, True);
 421		selmon = m;
 422		focus(NULL);
 423	}
 424	if(ev->window == selmon->barwin) {
 425		i = x = 0;
 426		do
 427			x += TEXTW(tags[i]);
 428		while(ev->x >= x && ++i < LENGTH(tags));
 429		if(i < LENGTH(tags)) {
 430			click = ClkTagBar;
 431			arg.ui = 1 << i;
 432		}
 433		else if(ev->x < x + blw)
 434			click = ClkLtSymbol;
 435		else if(ev->x > selmon->ww - TEXTW(stext))
 436			click = ClkStatusText;
 437		else
 438			click = ClkWinTitle;
 439	}
 440	else if((c = wintoclient(ev->window))) {
 441		focus(c);
 442		click = ClkClientWin;
 443	}
 444	for(i = 0; i < LENGTH(buttons); i++)
 445		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 446		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 447			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 448}
 449
 450void
 451checkotherwm(void) {
 452	xerrorxlib = XSetErrorHandler(xerrorstart);
 453	/* this causes an error if some other window manager is running */
 454	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 455	XSync(dpy, False);
 456	XSetErrorHandler(xerror);
 457	XSync(dpy, False);
 458}
 459
 460void
 461cleanup(void) {
 462	Arg a = {.ui = ~0};
 463	Layout foo = { "", NULL };
 464	Monitor *m;
 465
 466	view(&a);
 467	selmon->lt[selmon->sellt] = &foo;
 468	for(m = mons; m; m = m->next)
 469		while(m->stack)
 470			unmanage(m->stack, False);
 471	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 472	while(mons)
 473		cleanupmon(mons);
 474	drw_cur_free(drw, cursor[CurNormal]);
 475	drw_cur_free(drw, cursor[CurResize]);
 476	drw_cur_free(drw, cursor[CurMove]);
 477	drw_font_free(dpy, fnt);
 478	drw_clr_free(scheme[SchemeNorm].border);
 479	drw_clr_free(scheme[SchemeNorm].bg);
 480	drw_clr_free(scheme[SchemeNorm].fg);
 481	drw_clr_free(scheme[SchemeSel].border);
 482	drw_clr_free(scheme[SchemeSel].bg);
 483	drw_clr_free(scheme[SchemeSel].fg);
 484	drw_free(drw);
 485	XSync(dpy, False);
 486	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 487	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 488}
 489
 490void
 491cleanupmon(Monitor *mon) {
 492	Monitor *m;
 493
 494	if(mon == mons)
 495		mons = mons->next;
 496	else {
 497		for(m = mons; m && m->next != mon; m = m->next);
 498		m->next = mon->next;
 499	}
 500	XUnmapWindow(dpy, mon->barwin);
 501	XDestroyWindow(dpy, mon->barwin);
 502	free(mon);
 503}
 504
 505void
 506clearurgent(Client *c) {
 507	XWMHints *wmh;
 508
 509	c->isurgent = False;
 510	if(!(wmh = XGetWMHints(dpy, c->win)))
 511		return;
 512	wmh->flags &= ~XUrgencyHint;
 513	XSetWMHints(dpy, c->win, wmh);
 514	XFree(wmh);
 515}
 516
 517void
 518clientmessage(XEvent *e) {
 519	XClientMessageEvent *cme = &e->xclient;
 520	Client *c = wintoclient(cme->window);
 521
 522	if(!c)
 523		return;
 524	if(cme->message_type == netatom[NetWMState]) {
 525		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 526			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 527			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 528	}
 529	else if(cme->message_type == netatom[NetActiveWindow]) {
 530		if(!ISVISIBLE(c)) {
 531			c->mon->seltags ^= 1;
 532			c->mon->tagset[c->mon->seltags] = c->tags;
 533		}
 534		pop(c);
 535	}
 536}
 537
 538void
 539configure(Client *c) {
 540	XConfigureEvent ce;
 541
 542	ce.type = ConfigureNotify;
 543	ce.display = dpy;
 544	ce.event = c->win;
 545	ce.window = c->win;
 546	ce.x = c->x;
 547	ce.y = c->y;
 548	ce.width = c->w;
 549	ce.height = c->h;
 550	ce.border_width = c->bw;
 551	ce.above = None;
 552	ce.override_redirect = False;
 553	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 554}
 555
 556void
 557configurenotify(XEvent *e) {
 558	Monitor *m;
 559	XConfigureEvent *ev = &e->xconfigure;
 560	Bool dirty;
 561
 562	// TODO: updategeom handling sucks, needs to be simplified
 563	if(ev->window == root) {
 564		dirty = (sw != ev->width || sh != ev->height);
 565		sw = ev->width;
 566		sh = ev->height;
 567		if(updategeom() || dirty) {
 568			drw_resize(drw, sw, bh);
 569			updatebars();
 570			for(m = mons; m; m = m->next)
 571				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 572			focus(NULL);
 573			arrange(NULL);
 574		}
 575	}
 576}
 577
 578void
 579configurerequest(XEvent *e) {
 580	Client *c;
 581	Monitor *m;
 582	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 583	XWindowChanges wc;
 584
 585	if((c = wintoclient(ev->window))) {
 586		if(ev->value_mask & CWBorderWidth)
 587			c->bw = ev->border_width;
 588		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 589			m = c->mon;
 590			if(ev->value_mask & CWX) {
 591				c->oldx = c->x;
 592				c->x = m->mx + ev->x;
 593			}
 594			if(ev->value_mask & CWY) {
 595				c->oldy = c->y;
 596				c->y = m->my + ev->y;
 597			}
 598			if(ev->value_mask & CWWidth) {
 599				c->oldw = c->w;
 600				c->w = ev->width;
 601			}
 602			if(ev->value_mask & CWHeight) {
 603				c->oldh = c->h;
 604				c->h = ev->height;
 605			}
 606			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 607				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 608			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 609				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 610			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 611				configure(c);
 612			if(ISVISIBLE(c))
 613				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 614		}
 615		else
 616			configure(c);
 617	}
 618	else {
 619		wc.x = ev->x;
 620		wc.y = ev->y;
 621		wc.width = ev->width;
 622		wc.height = ev->height;
 623		wc.border_width = ev->border_width;
 624		wc.sibling = ev->above;
 625		wc.stack_mode = ev->detail;
 626		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 627	}
 628	XSync(dpy, False);
 629}
 630
 631Monitor *
 632createmon(void) {
 633	Monitor *m;
 634
 635	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 636		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 637	m->tagset[0] = m->tagset[1] = 1;
 638	m->mfact = mfact;
 639	m->nmaster = nmaster;
 640	m->showbar = showbar;
 641	m->topbar = topbar;
 642	m->lt[0] = &layouts[0];
 643	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 644	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 645	return m;
 646}
 647
 648void
 649destroynotify(XEvent *e) {
 650	Client *c;
 651	XDestroyWindowEvent *ev = &e->xdestroywindow;
 652
 653	if((c = wintoclient(ev->window)))
 654		unmanage(c, True);
 655}
 656
 657void
 658detach(Client *c) {
 659	Client **tc;
 660
 661	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 662	*tc = c->next;
 663}
 664
 665void
 666detachstack(Client *c) {
 667	Client **tc, *t;
 668
 669	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 670	*tc = c->snext;
 671
 672	if(c == c->mon->sel) {
 673		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 674		c->mon->sel = t;
 675	}
 676}
 677
 678Monitor *
 679dirtomon(int dir) {
 680	Monitor *m = NULL;
 681
 682	if(dir > 0) {
 683		if(!(m = selmon->next))
 684			m = mons;
 685	}
 686	else if(selmon == mons)
 687		for(m = mons; m->next; m = m->next);
 688	else
 689		for(m = mons; m->next != selmon; m = m->next);
 690	return m;
 691}
 692
 693void
 694drawbar(Monitor *m) {
 695	int x, xx, w;
 696	unsigned int i, occ = 0, urg = 0;
 697	Client *c;
 698
 699	for(c = m->clients; c; c = c->next) {
 700		occ |= c->tags;
 701		if(c->isurgent)
 702			urg |= c->tags;
 703	}
 704	x = 0;
 705	for(i = 0; i < LENGTH(tags); i++) {
 706		w = TEXTW(tags[i]);
 707		drw_setscheme(drw, m->tagset[m->seltags] & 1 << i ? &scheme[SchemeSel] : &scheme[SchemeNorm]);
 708		drw_text(drw, x, 0, w, bh, tags[i], urg & 1 << i);
 709		drw_rect(drw, x, 0, w, bh, m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 710		           occ & 1 << i, urg & 1 << i);
 711		x += w;
 712	}
 713	w = blw = TEXTW(m->ltsymbol);
 714	drw_setscheme(drw, &scheme[SchemeNorm]);
 715	drw_text(drw, x, 0, w, bh, m->ltsymbol, 0);
 716	x += w;
 717	xx = x;
 718	if(m == selmon) { /* status is only drawn on selected monitor */
 719		w = TEXTW(stext);
 720		x = m->ww - w;
 721		if(x < xx) {
 722			x = xx;
 723			w = m->ww - xx;
 724		}
 725		drw_text(drw, x, 0, w, bh, stext, 0);
 726	}
 727	else
 728		x = m->ww;
 729	if((w = x - xx) > bh) {
 730		x = xx;
 731		if(m->sel) {
 732			drw_setscheme(drw, m == selmon ? &scheme[SchemeSel] : &scheme[SchemeNorm]);
 733			drw_text(drw, x, 0, w, bh, m->sel->name, 0);
 734			drw_rect(drw, x, 0, w, bh, m->sel->isfixed, m->sel->isfloating, 0);
 735		}
 736		else {
 737			drw_setscheme(drw, &scheme[SchemeNorm]);
 738			drw_text(drw, x, 0, w, bh, NULL, 0);
 739		}
 740	}
 741	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 742}
 743
 744void
 745drawbars(void) {
 746	Monitor *m;
 747
 748	for(m = mons; m; m = m->next)
 749		drawbar(m);
 750}
 751
 752void
 753enternotify(XEvent *e) {
 754	Client *c;
 755	Monitor *m;
 756	XCrossingEvent *ev = &e->xcrossing;
 757
 758	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 759		return;
 760	c = wintoclient(ev->window);
 761	m = c ? c->mon : wintomon(ev->window);
 762	if(m != selmon) {
 763		unfocus(selmon->sel, True);
 764		selmon = m;
 765	}
 766	else if(!c || c == selmon->sel)
 767		return;
 768	focus(c);
 769}
 770
 771void
 772expose(XEvent *e) {
 773	Monitor *m;
 774	XExposeEvent *ev = &e->xexpose;
 775
 776	if(ev->count == 0 && (m = wintomon(ev->window)))
 777		drawbar(m);
 778}
 779
 780void
 781focus(Client *c) {
 782	if(!c || !ISVISIBLE(c))
 783		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 784	/* was if(selmon->sel) */
 785	if(selmon->sel && selmon->sel != c)
 786		unfocus(selmon->sel, False);
 787	if(c) {
 788		if(c->mon != selmon)
 789			selmon = c->mon;
 790		if(c->isurgent)
 791			clearurgent(c);
 792		detachstack(c);
 793		attachstack(c);
 794		grabbuttons(c, True);
 795		XSetWindowBorder(dpy, c->win, scheme[SchemeSel].border->rgb);
 796		setfocus(c);
 797	}
 798	else {
 799		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 800		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 801	}
 802	selmon->sel = c;
 803	drawbars();
 804}
 805
 806void
 807focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 808	XFocusChangeEvent *ev = &e->xfocus;
 809
 810	if(selmon->sel && ev->window != selmon->sel->win)
 811		setfocus(selmon->sel);
 812}
 813
 814void
 815focusmon(const Arg *arg) {
 816	Monitor *m;
 817
 818	if(!mons->next)
 819		return;
 820	if((m = dirtomon(arg->i)) == selmon)
 821		return;
 822	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 823					in gedit and anjuta */
 824	selmon = m;
 825	focus(NULL);
 826}
 827
 828void
 829focusstack(const Arg *arg) {
 830	Client *c = NULL, *i;
 831
 832	if(!selmon->sel)
 833		return;
 834	if(arg->i > 0) {
 835		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 836		if(!c)
 837			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 838	}
 839	else {
 840		for(i = selmon->clients; i != selmon->sel; i = i->next)
 841			if(ISVISIBLE(i))
 842				c = i;
 843		if(!c)
 844			for(; i; i = i->next)
 845				if(ISVISIBLE(i))
 846					c = i;
 847	}
 848	if(c) {
 849		focus(c);
 850		restack(selmon);
 851	}
 852}
 853
 854Atom
 855getatomprop(Client *c, Atom prop) {
 856	int di;
 857	unsigned long dl;
 858	unsigned char *p = NULL;
 859	Atom da, atom = None;
 860
 861	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 862	                      &da, &di, &dl, &dl, &p) == Success && p) {
 863		atom = *(Atom *)p;
 864		XFree(p);
 865	}
 866	return atom;
 867}
 868
 869Bool
 870getrootptr(int *x, int *y) {
 871	int di;
 872	unsigned int dui;
 873	Window dummy;
 874
 875	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 876}
 877
 878long
 879getstate(Window w) {
 880	int format;
 881	long result = -1;
 882	unsigned char *p = NULL;
 883	unsigned long n, extra;
 884	Atom real;
 885
 886	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 887	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 888		return -1;
 889	if(n != 0)
 890		result = *p;
 891	XFree(p);
 892	return result;
 893}
 894
 895Bool
 896gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 897	char **list = NULL;
 898	int n;
 899	XTextProperty name;
 900
 901	if(!text || size == 0)
 902		return False;
 903	text[0] = '\0';
 904	XGetTextProperty(dpy, w, &name, atom);
 905	if(!name.nitems)
 906		return False;
 907	if(name.encoding == XA_STRING)
 908		strncpy(text, (char *)name.value, size - 1);
 909	else {
 910		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 911			strncpy(text, *list, size - 1);
 912			XFreeStringList(list);
 913		}
 914	}
 915	text[size - 1] = '\0';
 916	XFree(name.value);
 917	return True;
 918}
 919
 920void
 921grabbuttons(Client *c, Bool focused) {
 922	updatenumlockmask();
 923	{
 924		unsigned int i, j;
 925		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 926		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 927		if(focused) {
 928			for(i = 0; i < LENGTH(buttons); i++)
 929				if(buttons[i].click == ClkClientWin)
 930					for(j = 0; j < LENGTH(modifiers); j++)
 931						XGrabButton(dpy, buttons[i].button,
 932						            buttons[i].mask | modifiers[j],
 933						            c->win, False, BUTTONMASK,
 934						            GrabModeAsync, GrabModeSync, None, None);
 935		}
 936		else
 937			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 938			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 939	}
 940}
 941
 942void
 943grabkeys(void) {
 944	updatenumlockmask();
 945	{
 946		unsigned int i, j;
 947		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 948		KeyCode code;
 949
 950		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 951		for(i = 0; i < LENGTH(keys); i++)
 952			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 953				for(j = 0; j < LENGTH(modifiers); j++)
 954					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 955						 True, GrabModeAsync, GrabModeAsync);
 956	}
 957}
 958
 959void
 960incnmaster(const Arg *arg) {
 961	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 962	arrange(selmon);
 963}
 964
 965#ifdef XINERAMA
 966static Bool
 967isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
 968	while(n--)
 969		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 970		&& unique[n].width == info->width && unique[n].height == info->height)
 971			return False;
 972	return True;
 973}
 974#endif /* XINERAMA */
 975
 976void
 977keypress(XEvent *e) {
 978	unsigned int i;
 979	KeySym keysym;
 980	XKeyEvent *ev;
 981
 982	ev = &e->xkey;
 983	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 984	for(i = 0; i < LENGTH(keys); i++)
 985		if(keysym == keys[i].keysym
 986		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 987		&& keys[i].func)
 988			keys[i].func(&(keys[i].arg));
 989}
 990
 991void
 992killclient(const Arg *arg) {
 993	if(!selmon->sel)
 994		return;
 995	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
 996		XGrabServer(dpy);
 997		XSetErrorHandler(xerrordummy);
 998		XSetCloseDownMode(dpy, DestroyAll);
 999		XKillClient(dpy, selmon->sel->win);
1000		XSync(dpy, False);
1001		XSetErrorHandler(xerror);
1002		XUngrabServer(dpy);
1003	}
1004}
1005
1006void
1007manage(Window w, XWindowAttributes *wa) {
1008	Client *c, *t = NULL;
1009	Window trans = None;
1010	XWindowChanges wc;
1011
1012	if(!(c = calloc(1, sizeof(Client))))
1013		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1014	c->win = w;
1015	updatetitle(c);
1016	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1017		c->mon = t->mon;
1018		c->tags = t->tags;
1019	}
1020	else {
1021		c->mon = selmon;
1022		applyrules(c);
1023	}
1024	/* geometry */
1025	c->x = c->oldx = wa->x;
1026	c->y = c->oldy = wa->y;
1027	c->w = c->oldw = wa->width;
1028	c->h = c->oldh = wa->height;
1029	c->oldbw = wa->border_width;
1030
1031	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1032		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1033	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1034		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1035	c->x = MAX(c->x, c->mon->mx);
1036	/* only fix client y-offset, if the client center might cover the bar */
1037	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1038	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1039	c->bw = borderpx;
1040
1041	wc.border_width = c->bw;
1042	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1043	XSetWindowBorder(dpy, w, scheme[SchemeNorm].border->rgb);
1044	configure(c); /* propagates border_width, if size doesn't change */
1045	updatewindowtype(c);
1046	updatesizehints(c);
1047	updatewmhints(c);
1048	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1049	grabbuttons(c, False);
1050	if(!c->isfloating)
1051		c->isfloating = c->oldstate = trans != None || c->isfixed;
1052	if(c->isfloating)
1053		XRaiseWindow(dpy, c->win);
1054	attach(c);
1055	attachstack(c);
1056	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1057	                (unsigned char *) &(c->win), 1);
1058	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1059	setclientstate(c, NormalState);
1060	if (c->mon == selmon)
1061		unfocus(selmon->sel, False);
1062	c->mon->sel = c;
1063	arrange(c->mon);
1064	XMapWindow(dpy, c->win);
1065	focus(NULL);
1066}
1067
1068void
1069mappingnotify(XEvent *e) {
1070	XMappingEvent *ev = &e->xmapping;
1071
1072	XRefreshKeyboardMapping(ev);
1073	if(ev->request == MappingKeyboard)
1074		grabkeys();
1075}
1076
1077void
1078maprequest(XEvent *e) {
1079	static XWindowAttributes wa;
1080	XMapRequestEvent *ev = &e->xmaprequest;
1081
1082	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1083		return;
1084	if(wa.override_redirect)
1085		return;
1086	if(!wintoclient(ev->window))
1087		manage(ev->window, &wa);
1088}
1089
1090void
1091monocle(Monitor *m) {
1092	unsigned int n = 0;
1093	Client *c;
1094
1095	for(c = m->clients; c; c = c->next)
1096		if(ISVISIBLE(c))
1097			n++;
1098	if(n > 0) /* override layout symbol */
1099		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1100	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1101		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1102}
1103
1104void
1105motionnotify(XEvent *e) {
1106	static Monitor *mon = NULL;
1107	Monitor *m;
1108	XMotionEvent *ev = &e->xmotion;
1109
1110	if(ev->window != root)
1111		return;
1112	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1113		unfocus(selmon->sel, True);
1114		selmon = m;
1115		focus(NULL);
1116	}
1117	mon = m;
1118}
1119
1120void
1121movemouse(const Arg *arg) {
1122	int x, y, ocx, ocy, nx, ny;
1123	Client *c;
1124	Monitor *m;
1125	XEvent ev;
1126	Time lasttime = 0;
1127
1128	if(!(c = selmon->sel))
1129		return;
1130	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1131		return;
1132	restack(selmon);
1133	ocx = c->x;
1134	ocy = c->y;
1135	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1136	None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1137		return;
1138	if(!getrootptr(&x, &y))
1139		return;
1140	do {
1141		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1142		switch(ev.type) {
1143		case ConfigureRequest:
1144		case Expose:
1145		case MapRequest:
1146			handler[ev.type](&ev);
1147			break;
1148		case MotionNotify:
1149			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1150				continue;
1151			lasttime = ev.xmotion.time;
1152
1153			nx = ocx + (ev.xmotion.x - x);
1154			ny = ocy + (ev.xmotion.y - y);
1155			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1156			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1157				if(abs(selmon->wx - nx) < snap)
1158					nx = selmon->wx;
1159				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1160					nx = selmon->wx + selmon->ww - WIDTH(c);
1161				if(abs(selmon->wy - ny) < snap)
1162					ny = selmon->wy;
1163				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1164					ny = selmon->wy + selmon->wh - HEIGHT(c);
1165				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1166				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1167					togglefloating(NULL);
1168			}
1169			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1170				resize(c, nx, ny, c->w, c->h, True);
1171			break;
1172		}
1173	} while(ev.type != ButtonRelease);
1174	XUngrabPointer(dpy, CurrentTime);
1175	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1176		sendmon(c, m);
1177		selmon = m;
1178		focus(NULL);
1179	}
1180}
1181
1182Client *
1183nexttiled(Client *c) {
1184	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1185	return c;
1186}
1187
1188void
1189pop(Client *c) {
1190	detach(c);
1191	attach(c);
1192	focus(c);
1193	arrange(c->mon);
1194}
1195
1196void
1197propertynotify(XEvent *e) {
1198	Client *c;
1199	Window trans;
1200	XPropertyEvent *ev = &e->xproperty;
1201
1202	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1203		updatestatus();
1204	else if(ev->state == PropertyDelete)
1205		return; /* ignore */
1206	else if((c = wintoclient(ev->window))) {
1207		switch(ev->atom) {
1208		default: break;
1209		case XA_WM_TRANSIENT_FOR:
1210			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1211			   (c->isfloating = (wintoclient(trans)) != NULL))
1212				arrange(c->mon);
1213			break;
1214		case XA_WM_NORMAL_HINTS:
1215			updatesizehints(c);
1216			break;
1217		case XA_WM_HINTS:
1218			updatewmhints(c);
1219			drawbars();
1220			break;
1221		}
1222		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1223			updatetitle(c);
1224			if(c == c->mon->sel)
1225				drawbar(c->mon);
1226		}
1227		if(ev->atom == netatom[NetWMWindowType])
1228			updatewindowtype(c);
1229	}
1230}
1231
1232void
1233quit(const Arg *arg) {
1234	running = False;
1235}
1236
1237Monitor *
1238recttomon(int x, int y, int w, int h) {
1239	Monitor *m, *r = selmon;
1240	int a, area = 0;
1241
1242	for(m = mons; m; m = m->next)
1243		if((a = INTERSECT(x, y, w, h, m)) > area) {
1244			area = a;
1245			r = m;
1246		}
1247	return r;
1248}
1249
1250void
1251resize(Client *c, int x, int y, int w, int h, Bool interact) {
1252	if(applysizehints(c, &x, &y, &w, &h, interact))
1253		resizeclient(c, x, y, w, h);
1254}
1255
1256void
1257resizeclient(Client *c, int x, int y, int w, int h) {
1258	XWindowChanges wc;
1259
1260	c->oldx = c->x; c->x = wc.x = x;
1261	c->oldy = c->y; c->y = wc.y = y;
1262	c->oldw = c->w; c->w = wc.width = w;
1263	c->oldh = c->h; c->h = wc.height = h;
1264	wc.border_width = c->bw;
1265	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1266	configure(c);
1267	XSync(dpy, False);
1268}
1269
1270void
1271resizemouse(const Arg *arg) {
1272	int ocx, ocy, nw, nh;
1273	Client *c;
1274	Monitor *m;
1275	XEvent ev;
1276	Time lasttime = 0;
1277
1278	if(!(c = selmon->sel))
1279		return;
1280	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1281		return;
1282	restack(selmon);
1283	ocx = c->x;
1284	ocy = c->y;
1285	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1286	                None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1287		return;
1288	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1289	do {
1290		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1291		switch(ev.type) {
1292		case ConfigureRequest:
1293		case Expose:
1294		case MapRequest:
1295			handler[ev.type](&ev);
1296			break;
1297		case MotionNotify:
1298			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1299				continue;
1300			lasttime = ev.xmotion.time;
1301
1302			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1303			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1304			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1305			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1306			{
1307				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1308				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1309					togglefloating(NULL);
1310			}
1311			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1312				resize(c, c->x, c->y, nw, nh, True);
1313			break;
1314		}
1315	} while(ev.type != ButtonRelease);
1316	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1317	XUngrabPointer(dpy, CurrentTime);
1318	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1319	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1320		sendmon(c, m);
1321		selmon = m;
1322		focus(NULL);
1323	}
1324}
1325
1326void
1327restack(Monitor *m) {
1328	Client *c;
1329	XEvent ev;
1330	XWindowChanges wc;
1331
1332	drawbar(m);
1333	if(!m->sel)
1334		return;
1335	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1336		XRaiseWindow(dpy, m->sel->win);
1337	if(m->lt[m->sellt]->arrange) {
1338		wc.stack_mode = Below;
1339		wc.sibling = m->barwin;
1340		for(c = m->stack; c; c = c->snext)
1341			if(!c->isfloating && ISVISIBLE(c)) {
1342				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1343				wc.sibling = c->win;
1344			}
1345	}
1346	XSync(dpy, False);
1347	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1348}
1349
1350void
1351run(void) {
1352	XEvent ev;
1353	/* main event loop */
1354	XSync(dpy, False);
1355	while(running && !XNextEvent(dpy, &ev))
1356		if(handler[ev.type])
1357			handler[ev.type](&ev); /* call handler */
1358}
1359
1360void
1361scan(void) {
1362	unsigned int i, num;
1363	Window d1, d2, *wins = NULL;
1364	XWindowAttributes wa;
1365
1366	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1367		for(i = 0; i < num; i++) {
1368			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1369			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1370				continue;
1371			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1372				manage(wins[i], &wa);
1373		}
1374		for(i = 0; i < num; i++) { /* now the transients */
1375			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1376				continue;
1377			if(XGetTransientForHint(dpy, wins[i], &d1)
1378			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1379				manage(wins[i], &wa);
1380		}
1381		if(wins)
1382			XFree(wins);
1383	}
1384}
1385
1386void
1387sendmon(Client *c, Monitor *m) {
1388	if(c->mon == m)
1389		return;
1390	unfocus(c, True);
1391	detach(c);
1392	detachstack(c);
1393	c->mon = m;
1394	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1395	attach(c);
1396	attachstack(c);
1397	focus(NULL);
1398	arrange(NULL);
1399}
1400
1401void
1402setclientstate(Client *c, long state) {
1403	long data[] = { state, None };
1404
1405	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1406			PropModeReplace, (unsigned char *)data, 2);
1407}
1408
1409Bool
1410sendevent(Client *c, Atom proto) {
1411	int n;
1412	Atom *protocols;
1413	Bool exists = False;
1414	XEvent ev;
1415
1416	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1417		while(!exists && n--)
1418			exists = protocols[n] == proto;
1419		XFree(protocols);
1420	}
1421	if(exists) {
1422		ev.type = ClientMessage;
1423		ev.xclient.window = c->win;
1424		ev.xclient.message_type = wmatom[WMProtocols];
1425		ev.xclient.format = 32;
1426		ev.xclient.data.l[0] = proto;
1427		ev.xclient.data.l[1] = CurrentTime;
1428		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1429	}
1430	return exists;
1431}
1432
1433void
1434setfocus(Client *c) {
1435	if(!c->neverfocus) {
1436		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1437		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1438 		                XA_WINDOW, 32, PropModeReplace,
1439 		                (unsigned char *) &(c->win), 1);
1440	}
1441	sendevent(c, wmatom[WMTakeFocus]);
1442}
1443
1444void
1445setfullscreen(Client *c, Bool fullscreen) {
1446	if(fullscreen) {
1447		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1448		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1449		c->isfullscreen = True;
1450		c->oldstate = c->isfloating;
1451		c->oldbw = c->bw;
1452		c->bw = 0;
1453		c->isfloating = True;
1454		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1455		XRaiseWindow(dpy, c->win);
1456	}
1457	else {
1458		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1459		                PropModeReplace, (unsigned char*)0, 0);
1460		c->isfullscreen = False;
1461		c->isfloating = c->oldstate;
1462		c->bw = c->oldbw;
1463		c->x = c->oldx;
1464		c->y = c->oldy;
1465		c->w = c->oldw;
1466		c->h = c->oldh;
1467		resizeclient(c, c->x, c->y, c->w, c->h);
1468		arrange(c->mon);
1469	}
1470}
1471
1472void
1473setlayout(const Arg *arg) {
1474	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1475		selmon->sellt ^= 1;
1476	if(arg && arg->v)
1477		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1478	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1479	if(selmon->sel)
1480		arrange(selmon);
1481	else
1482		drawbar(selmon);
1483}
1484
1485/* arg > 1.0 will set mfact absolutly */
1486void
1487setmfact(const Arg *arg) {
1488	float f;
1489
1490	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1491		return;
1492	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1493	if(f < 0.1 || f > 0.9)
1494		return;
1495	selmon->mfact = f;
1496	arrange(selmon);
1497}
1498
1499void
1500setup(void) {
1501	XSetWindowAttributes wa;
1502
1503	/* clean up any zombies immediately */
1504	sigchld(0);
1505
1506	/* init screen */
1507	screen = DefaultScreen(dpy);
1508	root = RootWindow(dpy, screen);
1509	fnt = drw_font_create(dpy, font);
1510	sw = DisplayWidth(dpy, screen);
1511	sh = DisplayHeight(dpy, screen);
1512	bh = fnt->h + 2;
1513	drw = drw_create(dpy, screen, root, sw, sh);
1514	drw_setfont(drw, fnt);
1515	updategeom();
1516	/* init atoms */
1517	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1518	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1519	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1520	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1521	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1522	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1523	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1524	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1525	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1526	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1527	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1528	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1529	/* init cursors */
1530	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1531	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1532	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1533	/* init appearance */
1534	scheme[SchemeNorm].border = drw_clr_create(drw, normbordercolor);
1535	scheme[SchemeNorm].bg = drw_clr_create(drw, normbgcolor);
1536	scheme[SchemeNorm].fg = drw_clr_create(drw, normfgcolor);
1537	scheme[SchemeSel].border = drw_clr_create(drw, selbordercolor);
1538	scheme[SchemeSel].bg = drw_clr_create(drw, selbgcolor);
1539	scheme[SchemeSel].fg = drw_clr_create(drw, selfgcolor);
1540	/* init bars */
1541	updatebars();
1542	updatestatus();
1543	/* EWMH support per view */
1544	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1545			PropModeReplace, (unsigned char *) netatom, NetLast);
1546	XDeleteProperty(dpy, root, netatom[NetClientList]);
1547	/* select for events */
1548	wa.cursor = cursor[CurNormal]->cursor;
1549	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1550	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1551	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1552	XSelectInput(dpy, root, wa.event_mask);
1553	grabkeys();
1554	focus(NULL);
1555}
1556
1557void
1558showhide(Client *c) {
1559	if(!c)
1560		return;
1561	if(ISVISIBLE(c)) { /* show clients top down */
1562		XMoveWindow(dpy, c->win, c->x, c->y);
1563		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1564			resize(c, c->x, c->y, c->w, c->h, False);
1565		showhide(c->snext);
1566	}
1567	else { /* hide clients bottom up */
1568		showhide(c->snext);
1569		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1570	}
1571}
1572
1573void
1574sigchld(int unused) {
1575	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1576		die("Can't install SIGCHLD handler");
1577	while(0 < waitpid(-1, NULL, WNOHANG));
1578}
1579
1580void
1581spawn(const Arg *arg) {
1582	if(arg->v == dmenucmd)
1583		dmenumon[0] = '0' + selmon->num;
1584	if(fork() == 0) {
1585		if(dpy)
1586			close(ConnectionNumber(dpy));
1587		setsid();
1588		execvp(((char **)arg->v)[0], (char **)arg->v);
1589		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1590		perror(" failed");
1591		exit(EXIT_SUCCESS);
1592	}
1593}
1594
1595void
1596tag(const Arg *arg) {
1597	if(selmon->sel && arg->ui & TAGMASK) {
1598		selmon->sel->tags = arg->ui & TAGMASK;
1599		focus(NULL);
1600		arrange(selmon);
1601	}
1602}
1603
1604void
1605tagmon(const Arg *arg) {
1606	if(!selmon->sel || !mons->next)
1607		return;
1608	sendmon(selmon->sel, dirtomon(arg->i));
1609}
1610
1611void
1612tile(Monitor *m) {
1613	unsigned int i, n, h, mw, my, ty;
1614	Client *c;
1615
1616	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1617	if(n == 0)
1618		return;
1619
1620	if(n > m->nmaster)
1621		mw = m->nmaster ? m->ww * m->mfact : 0;
1622	else
1623		mw = m->ww;
1624	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1625		if(i < m->nmaster) {
1626			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1627			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1628			my += HEIGHT(c);
1629		}
1630		else {
1631			h = (m->wh - ty) / (n - i);
1632			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1633			ty += HEIGHT(c);
1634		}
1635}
1636
1637void
1638togglebar(const Arg *arg) {
1639	selmon->showbar = !selmon->showbar;
1640	updatebarpos(selmon);
1641	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1642	arrange(selmon);
1643}
1644
1645void
1646togglefloating(const Arg *arg) {
1647	if(!selmon->sel)
1648		return;
1649	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1650		return;
1651	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1652	if(selmon->sel->isfloating)
1653		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1654		       selmon->sel->w, selmon->sel->h, False);
1655	arrange(selmon);
1656}
1657
1658void
1659toggletag(const Arg *arg) {
1660	unsigned int newtags;
1661
1662	if(!selmon->sel)
1663		return;
1664	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1665	if(newtags) {
1666		selmon->sel->tags = newtags;
1667		focus(NULL);
1668		arrange(selmon);
1669	}
1670}
1671
1672void
1673toggleview(const Arg *arg) {
1674	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1675
1676	if(newtagset) {
1677		selmon->tagset[selmon->seltags] = newtagset;
1678		focus(NULL);
1679		arrange(selmon);
1680	}
1681}
1682
1683void
1684unfocus(Client *c, Bool setfocus) {
1685	if(!c)
1686		return;
1687	grabbuttons(c, False);
1688	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm].border->rgb);
1689	if(setfocus) {
1690		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1691		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1692	}
1693}
1694
1695void
1696unmanage(Client *c, Bool destroyed) {
1697	Monitor *m = c->mon;
1698	XWindowChanges wc;
1699
1700	/* The server grab construct avoids race conditions. */
1701	detach(c);
1702	detachstack(c);
1703	if(!destroyed) {
1704		wc.border_width = c->oldbw;
1705		XGrabServer(dpy);
1706		XSetErrorHandler(xerrordummy);
1707		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1708		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1709		setclientstate(c, WithdrawnState);
1710		XSync(dpy, False);
1711		XSetErrorHandler(xerror);
1712		XUngrabServer(dpy);
1713	}
1714	free(c);
1715	focus(NULL);
1716	updateclientlist();
1717	arrange(m);
1718}
1719
1720void
1721unmapnotify(XEvent *e) {
1722	Client *c;
1723	XUnmapEvent *ev = &e->xunmap;
1724
1725	if((c = wintoclient(ev->window))) {
1726		if(ev->send_event)
1727			setclientstate(c, WithdrawnState);
1728		else
1729			unmanage(c, False);
1730	}
1731}
1732
1733void
1734updatebars(void) {
1735	Monitor *m;
1736	XSetWindowAttributes wa = {
1737		.override_redirect = True,
1738		.background_pixmap = ParentRelative,
1739		.event_mask = ButtonPressMask|ExposureMask
1740	};
1741	for(m = mons; m; m = m->next) {
1742		if (m->barwin)
1743			continue;
1744		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1745		                          CopyFromParent, DefaultVisual(dpy, screen),
1746		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1747		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1748		XMapRaised(dpy, m->barwin);
1749	}
1750}
1751
1752void
1753updatebarpos(Monitor *m) {
1754	m->wy = m->my;
1755	m->wh = m->mh;
1756	if(m->showbar) {
1757		m->wh -= bh;
1758		m->by = m->topbar ? m->wy : m->wy + m->wh;
1759		m->wy = m->topbar ? m->wy + bh : m->wy;
1760	}
1761	else
1762		m->by = -bh;
1763}
1764
1765void
1766updateclientlist() {
1767	Client *c;
1768	Monitor *m;
1769
1770	XDeleteProperty(dpy, root, netatom[NetClientList]);
1771	for(m = mons; m; m = m->next)
1772		for(c = m->clients; c; c = c->next)
1773			XChangeProperty(dpy, root, netatom[NetClientList],
1774			                XA_WINDOW, 32, PropModeAppend,
1775			                (unsigned char *) &(c->win), 1);
1776}
1777
1778Bool
1779updategeom(void) {
1780	Bool dirty = False;
1781
1782#ifdef XINERAMA
1783	if(XineramaIsActive(dpy)) {
1784		int i, j, n, nn;
1785		Client *c;
1786		Monitor *m;
1787		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1788		XineramaScreenInfo *unique = NULL;
1789
1790		for(n = 0, m = mons; m; m = m->next, n++);
1791		/* only consider unique geometries as separate screens */
1792		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1793			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1794		for(i = 0, j = 0; i < nn; i++)
1795			if(isuniquegeom(unique, j, &info[i]))
1796				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1797		XFree(info);
1798		nn = j;
1799		if(n <= nn) {
1800			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1801				for(m = mons; m && m->next; m = m->next);
1802				if(m)
1803					m->next = createmon();
1804				else
1805					mons = createmon();
1806			}
1807			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1808				if(i >= n
1809				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1810				    || unique[i].width != m->mw || unique[i].height != m->mh))
1811				{
1812					dirty = True;
1813					m->num = i;
1814					m->mx = m->wx = unique[i].x_org;
1815					m->my = m->wy = unique[i].y_org;
1816					m->mw = m->ww = unique[i].width;
1817					m->mh = m->wh = unique[i].height;
1818					updatebarpos(m);
1819				}
1820		}
1821		else { /* less monitors available nn < n */
1822			for(i = nn; i < n; i++) {
1823				for(m = mons; m && m->next; m = m->next);
1824				while(m->clients) {
1825					dirty = True;
1826					c = m->clients;
1827					m->clients = c->next;
1828					detachstack(c);
1829					c->mon = mons;
1830					attach(c);
1831					attachstack(c);
1832				}
1833				if(m == selmon)
1834					selmon = mons;
1835				cleanupmon(m);
1836			}
1837		}
1838		free(unique);
1839	}
1840	else
1841#endif /* XINERAMA */
1842	/* default monitor setup */
1843	{
1844		if(!mons)
1845			mons = createmon();
1846		if(mons->mw != sw || mons->mh != sh) {
1847			dirty = True;
1848			mons->mw = mons->ww = sw;
1849			mons->mh = mons->wh = sh;
1850			updatebarpos(mons);
1851		}
1852	}
1853	if(dirty) {
1854		selmon = mons;
1855		selmon = wintomon(root);
1856	}
1857	return dirty;
1858}
1859
1860void
1861updatenumlockmask(void) {
1862	unsigned int i, j;
1863	XModifierKeymap *modmap;
1864
1865	numlockmask = 0;
1866	modmap = XGetModifierMapping(dpy);
1867	for(i = 0; i < 8; i++)
1868		for(j = 0; j < modmap->max_keypermod; j++)
1869			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1870			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1871				numlockmask = (1 << i);
1872	XFreeModifiermap(modmap);
1873}
1874
1875void
1876updatesizehints(Client *c) {
1877	long msize;
1878	XSizeHints size;
1879
1880	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1881		/* size is uninitialized, ensure that size.flags aren't used */
1882		size.flags = PSize;
1883	if(size.flags & PBaseSize) {
1884		c->basew = size.base_width;
1885		c->baseh = size.base_height;
1886	}
1887	else if(size.flags & PMinSize) {
1888		c->basew = size.min_width;
1889		c->baseh = size.min_height;
1890	}
1891	else
1892		c->basew = c->baseh = 0;
1893	if(size.flags & PResizeInc) {
1894		c->incw = size.width_inc;
1895		c->inch = size.height_inc;
1896	}
1897	else
1898		c->incw = c->inch = 0;
1899	if(size.flags & PMaxSize) {
1900		c->maxw = size.max_width;
1901		c->maxh = size.max_height;
1902	}
1903	else
1904		c->maxw = c->maxh = 0;
1905	if(size.flags & PMinSize) {
1906		c->minw = size.min_width;
1907		c->minh = size.min_height;
1908	}
1909	else if(size.flags & PBaseSize) {
1910		c->minw = size.base_width;
1911		c->minh = size.base_height;
1912	}
1913	else
1914		c->minw = c->minh = 0;
1915	if(size.flags & PAspect) {
1916		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1917		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1918	}
1919	else
1920		c->maxa = c->mina = 0.0;
1921	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1922	             && c->maxw == c->minw && c->maxh == c->minh);
1923}
1924
1925void
1926updatetitle(Client *c) {
1927	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1928		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1929	if(c->name[0] == '\0') /* hack to mark broken clients */
1930		strcpy(c->name, broken);
1931}
1932
1933void
1934updatestatus(void) {
1935	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1936		strcpy(stext, "dwm-"VERSION);
1937	drawbar(selmon);
1938}
1939
1940void
1941updatewindowtype(Client *c) {
1942	Atom state = getatomprop(c, netatom[NetWMState]);
1943	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
1944
1945	if(state == netatom[NetWMFullscreen])
1946		setfullscreen(c, True);
1947	if(wtype == netatom[NetWMWindowTypeDialog])
1948		c->isfloating = True;
1949}
1950
1951void
1952updatewmhints(Client *c) {
1953	XWMHints *wmh;
1954
1955	if((wmh = XGetWMHints(dpy, c->win))) {
1956		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1957			wmh->flags &= ~XUrgencyHint;
1958			XSetWMHints(dpy, c->win, wmh);
1959		}
1960		else
1961			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1962		if(wmh->flags & InputHint)
1963			c->neverfocus = !wmh->input;
1964		else
1965			c->neverfocus = False;
1966		XFree(wmh);
1967	}
1968}
1969
1970void
1971view(const Arg *arg) {
1972	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1973		return;
1974	selmon->seltags ^= 1; /* toggle sel tagset */
1975	if(arg->ui & TAGMASK)
1976		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1977	focus(NULL);
1978	arrange(selmon);
1979}
1980
1981Client *
1982wintoclient(Window w) {
1983	Client *c;
1984	Monitor *m;
1985
1986	for(m = mons; m; m = m->next)
1987		for(c = m->clients; c; c = c->next)
1988			if(c->win == w)
1989				return c;
1990	return NULL;
1991}
1992
1993Monitor *
1994wintomon(Window w) {
1995	int x, y;
1996	Client *c;
1997	Monitor *m;
1998
1999	if(w == root && getrootptr(&x, &y))
2000		return recttomon(x, y, 1, 1);
2001	for(m = mons; m; m = m->next)
2002		if(w == m->barwin)
2003			return m;
2004	if((c = wintoclient(w)))
2005		return c->mon;
2006	return selmon;
2007}
2008
2009/* There's no way to check accesses to destroyed windows, thus those cases are
2010 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2011 * default error handler, which may call exit.  */
2012int
2013xerror(Display *dpy, XErrorEvent *ee) {
2014	if(ee->error_code == BadWindow
2015	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2016	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2017	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2018	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2019	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2020	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2021	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2022	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2023		return 0;
2024	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2025			ee->request_code, ee->error_code);
2026	return xerrorxlib(dpy, ee); /* may call exit */
2027}
2028
2029int
2030xerrordummy(Display *dpy, XErrorEvent *ee) {
2031	return 0;
2032}
2033
2034/* Startup Error handler to check if another window manager
2035 * is already running. */
2036int
2037xerrorstart(Display *dpy, XErrorEvent *ee) {
2038	die("dwm: another window manager is already running\n");
2039	return -1;
2040}
2041
2042void
2043zoom(const Arg *arg) {
2044	Client *c = selmon->sel;
2045
2046	if(!selmon->lt[selmon->sellt]->arrange
2047	|| (selmon->sel && selmon->sel->isfloating))
2048		return;
2049	if(c == nexttiled(selmon->clients))
2050		if(!c || !(c = nexttiled(c->next)))
2051			return;
2052	pop(c);
2053}
2054
2055int
2056main(int argc, char *argv[]) {
2057	if(argc == 2 && !strcmp("-v", argv[1]))
2058		die("dwm-"VERSION", © 2006-2014 dwm engineers, see LICENSE for details\n");
2059	else if(argc != 1)
2060		die("usage: dwm [-v]\n");
2061	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2062		fputs("warning: no locale support\n", stderr);
2063	if(!(dpy = XOpenDisplay(NULL)))
2064		die("dwm: cannot open display\n");
2065	checkotherwm();
2066	setup();
2067	scan();
2068	run();
2069	cleanup();
2070	XCloseDisplay(dpy);
2071	return EXIT_SUCCESS;
2072}