1/* See LICENSE file for copyright and license details.
   2 *
   3 * dynamic window manager is designed like any other X client as well. It is
   4 * driven through handling X events. In contrast to other X clients, a window
   5 * manager selects for SubstructureRedirectMask on the root window, to receive
   6 * events about window (dis-)appearance. Only one X connection at a time is
   7 * allowed to select for this event mask.
   8 *
   9 * The event handlers of dwm are organized in an array which is accessed
  10 * whenever a new event has been fetched. This allows event dispatching
  11 * in O(1) time.
  12 *
  13 * Each child of the root window is called a client, except windows which have
  14 * set the override_redirect flag. Clients are organized in a linked client
  15 * list on each monitor, the focus history is remembered through a stack list
  16 * on each monitor. Each client contains a bit array to indicate the tags of a
  17 * client.
  18 *
  19 * Keys and tagging rules are organized as arrays and defined in config.h.
  20 *
  21 * To understand everything else, start reading main().
  22 */
  23#include <errno.h>
  24#include <locale.h>
  25#include <signal.h>
  26#include <stdarg.h>
  27#include <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#include <X11/Xft/Xft.h>
  43
  44#include "drw.h"
  45#include "util.h"
  46
  47/* macros */
  48#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  49#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  50#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  51                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  52#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  53#define LENGTH(X)               (sizeof X / sizeof X[0])
  54#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  55#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  56#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  57#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  58#define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  59#define ColBorder               2
  60
  61/* enums */
  62enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  63enum { SchemeNorm, SchemeSel }; /* color schemes */
  64enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  65       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  66       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  67enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  68enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  69       ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  70
  71typedef union {
  72	int i;
  73	unsigned int ui;
  74	float f;
  75	const void *v;
  76} Arg;
  77
  78typedef struct {
  79	unsigned int click;
  80	unsigned int mask;
  81	unsigned int button;
  82	void (*func)(const Arg *arg);
  83	const Arg arg;
  84} Button;
  85
  86typedef struct Monitor Monitor;
  87typedef struct Client Client;
  88struct Client {
  89	char name[256];
  90	float mina, maxa;
  91	int x, y, w, h;
  92	int oldx, oldy, oldw, oldh;
  93	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  94	int bw, oldbw;
  95	unsigned int tags;
  96	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  97	Client *next;
  98	Client *snext;
  99	Monitor *mon;
 100	Window win;
 101};
 102
 103typedef struct {
 104	unsigned int mod;
 105	KeySym keysym;
 106	void (*func)(const Arg *);
 107	const Arg arg;
 108} Key;
 109
 110typedef struct {
 111	const char *symbol;
 112	void (*arrange)(Monitor *);
 113} Layout;
 114
 115struct Monitor {
 116	char ltsymbol[16];
 117	float mfact;
 118	int nmaster;
 119	int num;
 120	int by;               /* bar geometry */
 121	int mx, my, mw, mh;   /* screen size */
 122	int wx, wy, ww, wh;   /* window area  */
 123	unsigned int seltags;
 124	unsigned int sellt;
 125	unsigned int tagset[2];
 126	int showbar;
 127	int topbar;
 128	Client *clients;
 129	Client *sel;
 130	Client *stack;
 131	Monitor *next;
 132	Window barwin;
 133	const Layout *lt[2];
 134};
 135
 136typedef struct {
 137	const char *class;
 138	const char *instance;
 139	const char *title;
 140	unsigned int tags;
 141	int isfloating;
 142	int monitor;
 143} Rule;
 144
 145/* function declarations */
 146static void applyrules(Client *c);
 147static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 148static void arrange(Monitor *m);
 149static void arrangemon(Monitor *m);
 150static void attach(Client *c);
 151static void attachstack(Client *c);
 152static void buttonpress(XEvent *e);
 153static void checkotherwm(void);
 154static void cleanup(void);
 155static void cleanupmon(Monitor *mon);
 156static void clientmessage(XEvent *e);
 157static void configure(Client *c);
 158static void configurenotify(XEvent *e);
 159static void configurerequest(XEvent *e);
 160static Monitor *createmon(void);
 161static void destroynotify(XEvent *e);
 162static void detach(Client *c);
 163static void detachstack(Client *c);
 164static Monitor *dirtomon(int dir);
 165static void drawbar(Monitor *m);
 166static void drawbars(void);
 167static void enternotify(XEvent *e);
 168static void expose(XEvent *e);
 169static void focus(Client *c);
 170static void focusin(XEvent *e);
 171static void focusmon(const Arg *arg);
 172static void focusstack(const Arg *arg);
 173static int getrootptr(int *x, int *y);
 174static long getstate(Window w);
 175static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 176static void grabbuttons(Client *c, int focused);
 177static void grabkeys(void);
 178static void incnmaster(const Arg *arg);
 179static void keypress(XEvent *e);
 180static void killclient(const Arg *arg);
 181static void manage(Window w, XWindowAttributes *wa);
 182static void mappingnotify(XEvent *e);
 183static void maprequest(XEvent *e);
 184static void monocle(Monitor *m);
 185static void motionnotify(XEvent *e);
 186static void movemouse(const Arg *arg);
 187static Client *nexttiled(Client *c);
 188static void pop(Client *);
 189static void propertynotify(XEvent *e);
 190static void quit(const Arg *arg);
 191static Monitor *recttomon(int x, int y, int w, int h);
 192static void resize(Client *c, int x, int y, int w, int h, int interact);
 193static void resizeclient(Client *c, int x, int y, int w, int h);
 194static void resizemouse(const Arg *arg);
 195static void restack(Monitor *m);
 196static void run(void);
 197static void scan(void);
 198static int sendevent(Client *c, Atom proto);
 199static void sendmon(Client *c, Monitor *m);
 200static void setclientstate(Client *c, long state);
 201static void setfocus(Client *c);
 202static void setfullscreen(Client *c, int fullscreen);
 203static void setlayout(const Arg *arg);
 204static void setmfact(const Arg *arg);
 205static void setup(void);
 206static void seturgent(Client *c, int urg);
 207static void showhide(Client *c);
 208static void sigchld(int unused);
 209static void spawn(const Arg *arg);
 210static void tag(const Arg *arg);
 211static void tagmon(const Arg *arg);
 212static void tile(Monitor *);
 213static void togglebar(const Arg *arg);
 214static void togglefloating(const Arg *arg);
 215static void toggletag(const Arg *arg);
 216static void toggleview(const Arg *arg);
 217static void unfocus(Client *c, int setfocus);
 218static void unmanage(Client *c, int destroyed);
 219static void unmapnotify(XEvent *e);
 220static int updategeom(void);
 221static void updatebarpos(Monitor *m);
 222static void updatebars(void);
 223static void updateclientlist(void);
 224static void updatenumlockmask(void);
 225static void updatesizehints(Client *c);
 226static void updatestatus(void);
 227static void updatewindowtype(Client *c);
 228static void updatetitle(Client *c);
 229static void updatewmhints(Client *c);
 230static void view(const Arg *arg);
 231static Client *wintoclient(Window w);
 232static Monitor *wintomon(Window w);
 233static int xerror(Display *dpy, XErrorEvent *ee);
 234static int xerrordummy(Display *dpy, XErrorEvent *ee);
 235static int xerrorstart(Display *dpy, XErrorEvent *ee);
 236static void zoom(const Arg *arg);
 237
 238/* variables */
 239static const char broken[] = "broken";
 240static char stext[256];
 241static int screen;
 242static int sw, sh;           /* X display screen geometry width, height */
 243static int bh, blw = 0;      /* bar geometry */
 244static int lrpad;            /* sum of left and right padding for text */
 245static int (*xerrorxlib)(Display *, XErrorEvent *);
 246static unsigned int numlockmask = 0;
 247static void (*handler[LASTEvent]) (XEvent *) = {
 248	[ButtonPress] = buttonpress,
 249	[ClientMessage] = clientmessage,
 250	[ConfigureRequest] = configurerequest,
 251	[ConfigureNotify] = configurenotify,
 252	[DestroyNotify] = destroynotify,
 253	[EnterNotify] = enternotify,
 254	[Expose] = expose,
 255	[FocusIn] = focusin,
 256	[KeyPress] = keypress,
 257	[MappingNotify] = mappingnotify,
 258	[MapRequest] = maprequest,
 259	[MotionNotify] = motionnotify,
 260	[PropertyNotify] = propertynotify,
 261	[UnmapNotify] = unmapnotify
 262};
 263static Atom wmatom[WMLast], netatom[NetLast];
 264static int running = 1;
 265static Cur *cursor[CurLast];
 266static Scm *scheme;
 267static Display *dpy;
 268static Drw *drw;
 269static Monitor *mons, *selmon;
 270static Window root, wmcheckwin;
 271
 272/* configuration, allows nested code to access above variables */
 273#include "config.h"
 274
 275/* compile-time check if all tags fit into an unsigned int bit array. */
 276struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 277
 278/* function implementations */
 279void
 280applyrules(Client *c)
 281{
 282	const char *class, *instance;
 283	unsigned int i;
 284	const Rule *r;
 285	Monitor *m;
 286	XClassHint ch = { NULL, NULL };
 287
 288	/* rule matching */
 289	c->isfloating = 0;
 290	c->tags = 0;
 291	XGetClassHint(dpy, c->win, &ch);
 292	class    = ch.res_class ? ch.res_class : broken;
 293	instance = ch.res_name  ? ch.res_name  : broken;
 294
 295	for (i = 0; i < LENGTH(rules); i++) {
 296		r = &rules[i];
 297		if ((!r->title || strstr(c->name, r->title))
 298		&& (!r->class || strstr(class, r->class))
 299		&& (!r->instance || strstr(instance, r->instance)))
 300		{
 301			c->isfloating = r->isfloating;
 302			c->tags |= r->tags;
 303			for (m = mons; m && m->num != r->monitor; m = m->next);
 304			if (m)
 305				c->mon = m;
 306		}
 307	}
 308	if (ch.res_class)
 309		XFree(ch.res_class);
 310	if (ch.res_name)
 311		XFree(ch.res_name);
 312	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 313}
 314
 315int
 316applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 317{
 318	int baseismin;
 319	Monitor *m = c->mon;
 320
 321	/* set minimum possible */
 322	*w = MAX(1, *w);
 323	*h = MAX(1, *h);
 324	if (interact) {
 325		if (*x > sw)
 326			*x = sw - WIDTH(c);
 327		if (*y > sh)
 328			*y = sh - HEIGHT(c);
 329		if (*x + *w + 2 * c->bw < 0)
 330			*x = 0;
 331		if (*y + *h + 2 * c->bw < 0)
 332			*y = 0;
 333	} else {
 334		if (*x >= m->wx + m->ww)
 335			*x = m->wx + m->ww - WIDTH(c);
 336		if (*y >= m->wy + m->wh)
 337			*y = m->wy + m->wh - HEIGHT(c);
 338		if (*x + *w + 2 * c->bw <= m->wx)
 339			*x = m->wx;
 340		if (*y + *h + 2 * c->bw <= m->wy)
 341			*y = m->wy;
 342	}
 343	if (*h < bh)
 344		*h = bh;
 345	if (*w < bh)
 346		*w = bh;
 347	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 348		/* see last two sentences in ICCCM 4.1.2.3 */
 349		baseismin = c->basew == c->minw && c->baseh == c->minh;
 350		if (!baseismin) { /* temporarily remove base dimensions */
 351			*w -= c->basew;
 352			*h -= c->baseh;
 353		}
 354		/* adjust for aspect limits */
 355		if (c->mina > 0 && c->maxa > 0) {
 356			if (c->maxa < (float)*w / *h)
 357				*w = *h * c->maxa + 0.5;
 358			else if (c->mina < (float)*h / *w)
 359				*h = *w * c->mina + 0.5;
 360		}
 361		if (baseismin) { /* increment calculation requires this */
 362			*w -= c->basew;
 363			*h -= c->baseh;
 364		}
 365		/* adjust for increment value */
 366		if (c->incw)
 367			*w -= *w % c->incw;
 368		if (c->inch)
 369			*h -= *h % c->inch;
 370		/* restore base dimensions */
 371		*w = MAX(*w + c->basew, c->minw);
 372		*h = MAX(*h + c->baseh, c->minh);
 373		if (c->maxw)
 374			*w = MIN(*w, c->maxw);
 375		if (c->maxh)
 376			*h = MIN(*h, c->maxh);
 377	}
 378	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 379}
 380
 381void
 382arrange(Monitor *m)
 383{
 384	if (m)
 385		showhide(m->stack);
 386	else for (m = mons; m; m = m->next)
 387		showhide(m->stack);
 388	if (m) {
 389		arrangemon(m);
 390		restack(m);
 391	} else for (m = mons; m; m = m->next)
 392		arrangemon(m);
 393}
 394
 395void
 396arrangemon(Monitor *m)
 397{
 398	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 399	if (m->lt[m->sellt]->arrange)
 400		m->lt[m->sellt]->arrange(m);
 401}
 402
 403void
 404attach(Client *c)
 405{
 406	c->next = c->mon->clients;
 407	c->mon->clients = c;
 408}
 409
 410void
 411attachstack(Client *c)
 412{
 413	c->snext = c->mon->stack;
 414	c->mon->stack = c;
 415}
 416
 417void
 418buttonpress(XEvent *e)
 419{
 420	unsigned int i, x, click;
 421	Arg arg = {0};
 422	Client *c;
 423	Monitor *m;
 424	XButtonPressedEvent *ev = &e->xbutton;
 425
 426	click = ClkRootWin;
 427	/* focus monitor if necessary */
 428	if ((m = wintomon(ev->window)) && m != selmon) {
 429		unfocus(selmon->sel, 1);
 430		selmon = m;
 431		focus(NULL);
 432	}
 433	if (ev->window == selmon->barwin) {
 434		i = x = 0;
 435		do
 436			x += TEXTW(tags[i]);
 437		while (ev->x >= x && ++i < LENGTH(tags));
 438		if (i < LENGTH(tags)) {
 439			click = ClkTagBar;
 440			arg.ui = 1 << i;
 441		} else if (ev->x < x + blw)
 442			click = ClkLtSymbol;
 443		else if (ev->x > selmon->ww - TEXTW(stext))
 444			click = ClkStatusText;
 445		else
 446			click = ClkWinTitle;
 447	} else if ((c = wintoclient(ev->window))) {
 448		focus(c);
 449		restack(selmon);
 450		XAllowEvents(dpy, ReplayPointer, CurrentTime);
 451		click = ClkClientWin;
 452	}
 453	for (i = 0; i < LENGTH(buttons); i++)
 454		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 455		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 456			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 457}
 458
 459void
 460checkotherwm(void)
 461{
 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{
 473	Arg a = {.ui = ~0};
 474	Layout foo = { "", NULL };
 475	Monitor *m;
 476	size_t i;
 477
 478	view(&a);
 479	selmon->lt[selmon->sellt] = &foo;
 480	for (m = mons; m; m = m->next)
 481		while (m->stack)
 482			unmanage(m->stack, 0);
 483	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 484	while (mons)
 485		cleanupmon(mons);
 486	for (i = 0; i < CurLast; i++)
 487		drw_cur_free(drw, cursor[i]);
 488	for (i = 0; i < LENGTH(colors); i++)
 489		free(scheme[i]);
 490	XDestroyWindow(dpy, wmcheckwin);
 491	drw_free(drw);
 492	XSync(dpy, False);
 493	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 494	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 495}
 496
 497void
 498cleanupmon(Monitor *mon)
 499{
 500	Monitor *m;
 501
 502	if (mon == mons)
 503		mons = mons->next;
 504	else {
 505		for (m = mons; m && m->next != mon; m = m->next);
 506		m->next = mon->next;
 507	}
 508	XUnmapWindow(dpy, mon->barwin);
 509	XDestroyWindow(dpy, mon->barwin);
 510	free(mon);
 511}
 512
 513void
 514clientmessage(XEvent *e)
 515{
 516	XClientMessageEvent *cme = &e->xclient;
 517	Client *c = wintoclient(cme->window);
 518
 519	if (!c)
 520		return;
 521	if (cme->message_type == netatom[NetWMState]) {
 522		if (cme->data.l[1] == netatom[NetWMFullscreen]
 523		|| cme->data.l[2] == netatom[NetWMFullscreen])
 524			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 525			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 526	} else if (cme->message_type == netatom[NetActiveWindow]) {
 527		if (c != selmon->sel && !c->isurgent)
 528			seturgent(c, 1);
 529	}
 530}
 531
 532void
 533configure(Client *c)
 534{
 535	XConfigureEvent ce;
 536
 537	ce.type = ConfigureNotify;
 538	ce.display = dpy;
 539	ce.event = c->win;
 540	ce.window = c->win;
 541	ce.x = c->x;
 542	ce.y = c->y;
 543	ce.width = c->w;
 544	ce.height = c->h;
 545	ce.border_width = c->bw;
 546	ce.above = None;
 547	ce.override_redirect = False;
 548	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 549}
 550
 551void
 552configurenotify(XEvent *e)
 553{
 554	Monitor *m;
 555	Client *c;
 556	XConfigureEvent *ev = &e->xconfigure;
 557	int dirty;
 558
 559	/* TODO: updategeom handling sucks, needs to be simplified */
 560	if (ev->window == root) {
 561		dirty = (sw != ev->width || sh != ev->height);
 562		sw = ev->width;
 563		sh = ev->height;
 564		if (updategeom() || dirty) {
 565			drw_resize(drw, sw, bh);
 566			updatebars();
 567			for (m = mons; m; m = m->next) {
 568				for (c = m->clients; c; c = c->next)
 569					if (c->isfullscreen)
 570						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 571				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 572			}
 573			focus(NULL);
 574			arrange(NULL);
 575		}
 576	}
 577}
 578
 579void
 580configurerequest(XEvent *e)
 581{
 582	Client *c;
 583	Monitor *m;
 584	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 585	XWindowChanges wc;
 586
 587	if ((c = wintoclient(ev->window))) {
 588		if (ev->value_mask & CWBorderWidth)
 589			c->bw = ev->border_width;
 590		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 591			m = c->mon;
 592			if (ev->value_mask & CWX) {
 593				c->oldx = c->x;
 594				c->x = m->mx + ev->x;
 595			}
 596			if (ev->value_mask & CWY) {
 597				c->oldy = c->y;
 598				c->y = m->my + ev->y;
 599			}
 600			if (ev->value_mask & CWWidth) {
 601				c->oldw = c->w;
 602				c->w = ev->width;
 603			}
 604			if (ev->value_mask & CWHeight) {
 605				c->oldh = c->h;
 606				c->h = ev->height;
 607			}
 608			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 609				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 610			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 611				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 612			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 613				configure(c);
 614			if (ISVISIBLE(c))
 615				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 616		} else
 617			configure(c);
 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{
 634	Monitor *m;
 635
 636	m = ecalloc(1, 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{
 651	Client *c;
 652	XDestroyWindowEvent *ev = &e->xdestroywindow;
 653
 654	if ((c = wintoclient(ev->window)))
 655		unmanage(c, 1);
 656}
 657
 658void
 659detach(Client *c)
 660{
 661	Client **tc;
 662
 663	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 664	*tc = c->next;
 665}
 666
 667void
 668detachstack(Client *c)
 669{
 670	Client **tc, *t;
 671
 672	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 673	*tc = c->snext;
 674
 675	if (c == c->mon->sel) {
 676		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 677		c->mon->sel = t;
 678	}
 679}
 680
 681Monitor *
 682dirtomon(int dir)
 683{
 684	Monitor *m = NULL;
 685
 686	if (dir > 0) {
 687		if (!(m = selmon->next))
 688			m = mons;
 689	} else if (selmon == mons)
 690		for (m = mons; m->next; m = m->next);
 691	else
 692		for (m = mons; m->next != selmon; m = m->next);
 693	return m;
 694}
 695
 696void
 697drawbar(Monitor *m)
 698{
 699	int x, w, sw = 0;
 700	int boxs = drw->fonts->h / 9;
 701	int boxw = drw->fonts->h / 6 + 2;
 702	unsigned int i, occ = 0, urg = 0;
 703	Client *c;
 704
 705	/* draw status first so it can be overdrawn by tags later */
 706	if (m == selmon) { /* status is only drawn on selected monitor */
 707		drw_setscheme(drw, scheme[SchemeNorm]);
 708		sw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 709		drw_text(drw, m->ww - sw, 0, sw, bh, 0, stext, 0);
 710	}
 711
 712	for (c = m->clients; c; c = c->next) {
 713		occ |= c->tags;
 714		if (c->isurgent)
 715			urg |= c->tags;
 716	}
 717	x = 0;
 718	for (i = 0; i < LENGTH(tags); i++) {
 719		w = TEXTW(tags[i]);
 720		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 721		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 722		if (occ & 1 << i)
 723			drw_rect(drw, x + boxs, boxs, boxw, boxw,
 724			         m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 725			         urg & 1 << i);
 726		x += w;
 727	}
 728	w = blw = TEXTW(m->ltsymbol);
 729	drw_setscheme(drw, scheme[SchemeNorm]);
 730	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 731
 732	if ((w = m->ww - sw - x) > bh) {
 733		if (m->sel) {
 734			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 735			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 736			if (m->sel->isfloating)
 737				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 738		} else {
 739			drw_setscheme(drw, scheme[SchemeNorm]);
 740			drw_rect(drw, x, 0, w, bh, 1, 1);
 741		}
 742	}
 743	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 744}
 745
 746void
 747drawbars(void)
 748{
 749	Monitor *m;
 750
 751	for (m = mons; m; m = m->next)
 752		drawbar(m);
 753}
 754
 755void
 756enternotify(XEvent *e)
 757{
 758	Client *c;
 759	Monitor *m;
 760	XCrossingEvent *ev = &e->xcrossing;
 761
 762	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 763		return;
 764	c = wintoclient(ev->window);
 765	m = c ? c->mon : wintomon(ev->window);
 766	if (m != selmon) {
 767		unfocus(selmon->sel, 1);
 768		selmon = m;
 769	} else if (!c || c == selmon->sel)
 770		return;
 771	focus(c);
 772}
 773
 774void
 775expose(XEvent *e)
 776{
 777	Monitor *m;
 778	XExposeEvent *ev = &e->xexpose;
 779
 780	if (ev->count == 0 && (m = wintomon(ev->window)))
 781		drawbar(m);
 782}
 783
 784void
 785focus(Client *c)
 786{
 787	if (!c || !ISVISIBLE(c))
 788		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 789	if (selmon->sel && selmon->sel != c)
 790		unfocus(selmon->sel, 0);
 791	if (c) {
 792		if (c->mon != selmon)
 793			selmon = c->mon;
 794		if (c->isurgent)
 795			seturgent(c, 0);
 796		detachstack(c);
 797		attachstack(c);
 798		grabbuttons(c, 1);
 799		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 800		setfocus(c);
 801	} else {
 802		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 803		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 804	}
 805	selmon->sel = c;
 806	drawbars();
 807}
 808
 809/* there are some broken focus acquiring clients needing extra handling */
 810void
 811focusin(XEvent *e)
 812{
 813	XFocusChangeEvent *ev = &e->xfocus;
 814
 815	if (selmon->sel && ev->window != selmon->sel->win)
 816		setfocus(selmon->sel);
 817}
 818
 819void
 820focusmon(const Arg *arg)
 821{
 822	Monitor *m;
 823
 824	if (!mons->next)
 825		return;
 826	if ((m = dirtomon(arg->i)) == selmon)
 827		return;
 828	unfocus(selmon->sel, 0);
 829	selmon = m;
 830	focus(NULL);
 831}
 832
 833void
 834focusstack(const Arg *arg)
 835{
 836	Client *c = NULL, *i;
 837
 838	if (!selmon->sel)
 839		return;
 840	if (arg->i > 0) {
 841		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 842		if (!c)
 843			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 844	} else {
 845		for (i = selmon->clients; i != selmon->sel; i = i->next)
 846			if (ISVISIBLE(i))
 847				c = i;
 848		if (!c)
 849			for (; i; i = i->next)
 850				if (ISVISIBLE(i))
 851					c = i;
 852	}
 853	if (c) {
 854		focus(c);
 855		restack(selmon);
 856	}
 857}
 858
 859Atom
 860getatomprop(Client *c, Atom prop)
 861{
 862	int di;
 863	unsigned long dl;
 864	unsigned char *p = NULL;
 865	Atom da, atom = None;
 866
 867	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 868	                      &da, &di, &dl, &dl, &p) == Success && p) {
 869		atom = *(Atom *)p;
 870		XFree(p);
 871	}
 872	return atom;
 873}
 874
 875int
 876getrootptr(int *x, int *y)
 877{
 878	int di;
 879	unsigned int dui;
 880	Window dummy;
 881
 882	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 883}
 884
 885long
 886getstate(Window w)
 887{
 888	int format;
 889	long result = -1;
 890	unsigned char *p = NULL;
 891	unsigned long n, extra;
 892	Atom real;
 893
 894	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 895	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 896		return -1;
 897	if (n != 0)
 898		result = *p;
 899	XFree(p);
 900	return result;
 901}
 902
 903int
 904gettextprop(Window w, Atom atom, char *text, unsigned int size)
 905{
 906	char **list = NULL;
 907	int n;
 908	XTextProperty name;
 909
 910	if (!text || size == 0)
 911		return 0;
 912	text[0] = '\0';
 913	XGetTextProperty(dpy, w, &name, atom);
 914	if (!name.nitems)
 915		return 0;
 916	if (name.encoding == XA_STRING)
 917		strncpy(text, (char *)name.value, size - 1);
 918	else {
 919		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 920			strncpy(text, *list, size - 1);
 921			XFreeStringList(list);
 922		}
 923	}
 924	text[size - 1] = '\0';
 925	XFree(name.value);
 926	return 1;
 927}
 928
 929void
 930grabbuttons(Client *c, int focused)
 931{
 932	updatenumlockmask();
 933	{
 934		unsigned int i, j;
 935		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 936		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 937		if (!focused)
 938			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 939			            BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
 940		for (i = 0; i < LENGTH(buttons); i++)
 941			if (buttons[i].click == ClkClientWin)
 942				for (j = 0; j < LENGTH(modifiers); j++)
 943					XGrabButton(dpy, buttons[i].button,
 944					            buttons[i].mask | modifiers[j],
 945					            c->win, False, BUTTONMASK,
 946					            GrabModeAsync, GrabModeSync, None, None);
 947	}
 948}
 949
 950void
 951grabkeys(void)
 952{
 953	updatenumlockmask();
 954	{
 955		unsigned int i, j;
 956		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 957		KeyCode code;
 958
 959		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 960		for (i = 0; i < LENGTH(keys); i++)
 961			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 962				for (j = 0; j < LENGTH(modifiers); j++)
 963					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 964					         True, GrabModeAsync, GrabModeAsync);
 965	}
 966}
 967
 968void
 969incnmaster(const Arg *arg)
 970{
 971	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 972	arrange(selmon);
 973}
 974
 975#ifdef XINERAMA
 976static int
 977isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 978{
 979	while (n--)
 980		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 981		&& unique[n].width == info->width && unique[n].height == info->height)
 982			return 0;
 983	return 1;
 984}
 985#endif /* XINERAMA */
 986
 987void
 988keypress(XEvent *e)
 989{
 990	unsigned int i;
 991	KeySym keysym;
 992	XKeyEvent *ev;
 993
 994	ev = &e->xkey;
 995	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 996	for (i = 0; i < LENGTH(keys); i++)
 997		if (keysym == keys[i].keysym
 998		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 999		&& keys[i].func)
1000			keys[i].func(&(keys[i].arg));
1001}
1002
1003void
1004killclient(const Arg *arg)
1005{
1006	if (!selmon->sel)
1007		return;
1008	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1009		XGrabServer(dpy);
1010		XSetErrorHandler(xerrordummy);
1011		XSetCloseDownMode(dpy, DestroyAll);
1012		XKillClient(dpy, selmon->sel->win);
1013		XSync(dpy, False);
1014		XSetErrorHandler(xerror);
1015		XUngrabServer(dpy);
1016	}
1017}
1018
1019void
1020manage(Window w, XWindowAttributes *wa)
1021{
1022	Client *c, *t = NULL;
1023	Window trans = None;
1024	XWindowChanges wc;
1025
1026	c = ecalloc(1, sizeof(Client));
1027	c->win = w;
1028	/* geometry */
1029	c->x = c->oldx = wa->x;
1030	c->y = c->oldy = wa->y;
1031	c->w = c->oldw = wa->width;
1032	c->h = c->oldh = wa->height;
1033	c->oldbw = wa->border_width;
1034
1035	updatetitle(c);
1036	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1037		c->mon = t->mon;
1038		c->tags = t->tags;
1039	} else {
1040		c->mon = selmon;
1041		applyrules(c);
1042	}
1043
1044	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1045		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1046	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1047		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1048	c->x = MAX(c->x, c->mon->mx);
1049	/* only fix client y-offset, if the client center might cover the bar */
1050	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1051	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1052	c->bw = borderpx;
1053
1054	wc.border_width = c->bw;
1055	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1056	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1057	configure(c); /* propagates border_width, if size doesn't change */
1058	updatewindowtype(c);
1059	updatesizehints(c);
1060	updatewmhints(c);
1061	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1062	grabbuttons(c, 0);
1063	if (!c->isfloating)
1064		c->isfloating = c->oldstate = trans != None || c->isfixed;
1065	if (c->isfloating)
1066		XRaiseWindow(dpy, c->win);
1067	attach(c);
1068	attachstack(c);
1069	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1070	                (unsigned char *) &(c->win), 1);
1071	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1072	setclientstate(c, NormalState);
1073	if (c->mon == selmon)
1074		unfocus(selmon->sel, 0);
1075	c->mon->sel = c;
1076	arrange(c->mon);
1077	XMapWindow(dpy, c->win);
1078	focus(NULL);
1079}
1080
1081void
1082mappingnotify(XEvent *e)
1083{
1084	XMappingEvent *ev = &e->xmapping;
1085
1086	XRefreshKeyboardMapping(ev);
1087	if (ev->request == MappingKeyboard)
1088		grabkeys();
1089}
1090
1091void
1092maprequest(XEvent *e)
1093{
1094	static XWindowAttributes wa;
1095	XMapRequestEvent *ev = &e->xmaprequest;
1096
1097	if (!XGetWindowAttributes(dpy, ev->window, &wa))
1098		return;
1099	if (wa.override_redirect)
1100		return;
1101	if (!wintoclient(ev->window))
1102		manage(ev->window, &wa);
1103}
1104
1105void
1106monocle(Monitor *m)
1107{
1108	unsigned int n = 0;
1109	Client *c;
1110
1111	for (c = m->clients; c; c = c->next)
1112		if (ISVISIBLE(c))
1113			n++;
1114	if (n > 0) /* override layout symbol */
1115		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1116	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1117		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1118}
1119
1120void
1121motionnotify(XEvent *e)
1122{
1123	static Monitor *mon = NULL;
1124	Monitor *m;
1125	XMotionEvent *ev = &e->xmotion;
1126
1127	if (ev->window != root)
1128		return;
1129	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1130		unfocus(selmon->sel, 1);
1131		selmon = m;
1132		focus(NULL);
1133	}
1134	mon = m;
1135}
1136
1137void
1138movemouse(const Arg *arg)
1139{
1140	int x, y, ocx, ocy, nx, ny;
1141	Client *c;
1142	Monitor *m;
1143	XEvent ev;
1144	Time lasttime = 0;
1145
1146	if (!(c = selmon->sel))
1147		return;
1148	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1149		return;
1150	restack(selmon);
1151	ocx = c->x;
1152	ocy = c->y;
1153	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1154	    None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1155		return;
1156	if (!getrootptr(&x, &y))
1157		return;
1158	do {
1159		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1160		switch(ev.type) {
1161		case ConfigureRequest:
1162		case Expose:
1163		case MapRequest:
1164			handler[ev.type](&ev);
1165			break;
1166		case MotionNotify:
1167			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1168				continue;
1169			lasttime = ev.xmotion.time;
1170
1171			nx = ocx + (ev.xmotion.x - x);
1172			ny = ocy + (ev.xmotion.y - y);
1173			if (nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1174			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1175				if (abs(selmon->wx - nx) < snap)
1176					nx = selmon->wx;
1177				else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1178					nx = selmon->wx + selmon->ww - WIDTH(c);
1179				if (abs(selmon->wy - ny) < snap)
1180					ny = selmon->wy;
1181				else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1182					ny = selmon->wy + selmon->wh - HEIGHT(c);
1183				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1184				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1185					togglefloating(NULL);
1186			}
1187			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1188				resize(c, nx, ny, c->w, c->h, 1);
1189			break;
1190		}
1191	} while (ev.type != ButtonRelease);
1192	XUngrabPointer(dpy, CurrentTime);
1193	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1194		sendmon(c, m);
1195		selmon = m;
1196		focus(NULL);
1197	}
1198}
1199
1200Client *
1201nexttiled(Client *c)
1202{
1203	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1204	return c;
1205}
1206
1207void
1208pop(Client *c)
1209{
1210	detach(c);
1211	attach(c);
1212	focus(c);
1213	arrange(c->mon);
1214}
1215
1216void
1217propertynotify(XEvent *e)
1218{
1219	Client *c;
1220	Window trans;
1221	XPropertyEvent *ev = &e->xproperty;
1222
1223	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1224		updatestatus();
1225	else if (ev->state == PropertyDelete)
1226		return; /* ignore */
1227	else if ((c = wintoclient(ev->window))) {
1228		switch(ev->atom) {
1229		default: break;
1230		case XA_WM_TRANSIENT_FOR:
1231			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1232			   (c->isfloating = (wintoclient(trans)) != NULL))
1233				arrange(c->mon);
1234			break;
1235		case XA_WM_NORMAL_HINTS:
1236			updatesizehints(c);
1237			break;
1238		case XA_WM_HINTS:
1239			updatewmhints(c);
1240			drawbars();
1241			break;
1242		}
1243		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1244			updatetitle(c);
1245			if (c == c->mon->sel)
1246				drawbar(c->mon);
1247		}
1248		if (ev->atom == netatom[NetWMWindowType])
1249			updatewindowtype(c);
1250	}
1251}
1252
1253void
1254quit(const Arg *arg)
1255{
1256	running = 0;
1257}
1258
1259Monitor *
1260recttomon(int x, int y, int w, int h)
1261{
1262	Monitor *m, *r = selmon;
1263	int a, area = 0;
1264
1265	for (m = mons; m; m = m->next)
1266		if ((a = INTERSECT(x, y, w, h, m)) > area) {
1267			area = a;
1268			r = m;
1269		}
1270	return r;
1271}
1272
1273void
1274resize(Client *c, int x, int y, int w, int h, int interact)
1275{
1276	if (applysizehints(c, &x, &y, &w, &h, interact))
1277		resizeclient(c, x, y, w, h);
1278}
1279
1280void
1281resizeclient(Client *c, int x, int y, int w, int h)
1282{
1283	XWindowChanges wc;
1284
1285	c->oldx = c->x; c->x = wc.x = x;
1286	c->oldy = c->y; c->y = wc.y = y;
1287	c->oldw = c->w; c->w = wc.width = w;
1288	c->oldh = c->h; c->h = wc.height = h;
1289	wc.border_width = c->bw;
1290	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1291	configure(c);
1292	XSync(dpy, False);
1293}
1294
1295void
1296resizemouse(const Arg *arg)
1297{
1298	int ocx, ocy, nw, nh;
1299	Client *c;
1300	Monitor *m;
1301	XEvent ev;
1302	Time lasttime = 0;
1303
1304	if (!(c = selmon->sel))
1305		return;
1306	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1307		return;
1308	restack(selmon);
1309	ocx = c->x;
1310	ocy = c->y;
1311	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1312	                None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1313		return;
1314	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1315	do {
1316		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1317		switch(ev.type) {
1318		case ConfigureRequest:
1319		case Expose:
1320		case MapRequest:
1321			handler[ev.type](&ev);
1322			break;
1323		case MotionNotify:
1324			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1325				continue;
1326			lasttime = ev.xmotion.time;
1327
1328			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1329			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1330			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1331			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1332			{
1333				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1334				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1335					togglefloating(NULL);
1336			}
1337			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1338				resize(c, c->x, c->y, nw, nh, 1);
1339			break;
1340		}
1341	} while (ev.type != ButtonRelease);
1342	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1343	XUngrabPointer(dpy, CurrentTime);
1344	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1345	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1346		sendmon(c, m);
1347		selmon = m;
1348		focus(NULL);
1349	}
1350}
1351
1352void
1353restack(Monitor *m)
1354{
1355	Client *c;
1356	XEvent ev;
1357	XWindowChanges wc;
1358
1359	drawbar(m);
1360	if (!m->sel)
1361		return;
1362	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1363		XRaiseWindow(dpy, m->sel->win);
1364	if (m->lt[m->sellt]->arrange) {
1365		wc.stack_mode = Below;
1366		wc.sibling = m->barwin;
1367		for (c = m->stack; c; c = c->snext)
1368			if (!c->isfloating && ISVISIBLE(c)) {
1369				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1370				wc.sibling = c->win;
1371			}
1372	}
1373	XSync(dpy, False);
1374	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1375}
1376
1377void
1378run(void)
1379{
1380	XEvent ev;
1381	/* main event loop */
1382	XSync(dpy, False);
1383	while (running && !XNextEvent(dpy, &ev))
1384		if (handler[ev.type])
1385			handler[ev.type](&ev); /* call handler */
1386}
1387
1388void
1389scan(void)
1390{
1391	unsigned int i, num;
1392	Window d1, d2, *wins = NULL;
1393	XWindowAttributes wa;
1394
1395	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1396		for (i = 0; i < num; i++) {
1397			if (!XGetWindowAttributes(dpy, wins[i], &wa)
1398			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1399				continue;
1400			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1401				manage(wins[i], &wa);
1402		}
1403		for (i = 0; i < num; i++) { /* now the transients */
1404			if (!XGetWindowAttributes(dpy, wins[i], &wa))
1405				continue;
1406			if (XGetTransientForHint(dpy, wins[i], &d1)
1407			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1408				manage(wins[i], &wa);
1409		}
1410		if (wins)
1411			XFree(wins);
1412	}
1413}
1414
1415void
1416sendmon(Client *c, Monitor *m)
1417{
1418	if (c->mon == m)
1419		return;
1420	unfocus(c, 1);
1421	detach(c);
1422	detachstack(c);
1423	c->mon = m;
1424	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1425	attach(c);
1426	attachstack(c);
1427	focus(NULL);
1428	arrange(NULL);
1429}
1430
1431void
1432setclientstate(Client *c, long state)
1433{
1434	long data[] = { state, None };
1435
1436	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1437	                PropModeReplace, (unsigned char *)data, 2);
1438}
1439
1440int
1441sendevent(Client *c, Atom proto)
1442{
1443	int n;
1444	Atom *protocols;
1445	int exists = 0;
1446	XEvent ev;
1447
1448	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1449		while (!exists && n--)
1450			exists = protocols[n] == proto;
1451		XFree(protocols);
1452	}
1453	if (exists) {
1454		ev.type = ClientMessage;
1455		ev.xclient.window = c->win;
1456		ev.xclient.message_type = wmatom[WMProtocols];
1457		ev.xclient.format = 32;
1458		ev.xclient.data.l[0] = proto;
1459		ev.xclient.data.l[1] = CurrentTime;
1460		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1461	}
1462	return exists;
1463}
1464
1465void
1466setfocus(Client *c)
1467{
1468	if (!c->neverfocus) {
1469		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1470		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1471		                XA_WINDOW, 32, PropModeReplace,
1472		                (unsigned char *) &(c->win), 1);
1473	}
1474	sendevent(c, wmatom[WMTakeFocus]);
1475}
1476
1477void
1478setfullscreen(Client *c, int fullscreen)
1479{
1480	if (fullscreen && !c->isfullscreen) {
1481		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1482		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1483		c->isfullscreen = 1;
1484		c->oldstate = c->isfloating;
1485		c->oldbw = c->bw;
1486		c->bw = 0;
1487		c->isfloating = 1;
1488		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1489		XRaiseWindow(dpy, c->win);
1490	} else if (!fullscreen && c->isfullscreen){
1491		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1492		                PropModeReplace, (unsigned char*)0, 0);
1493		c->isfullscreen = 0;
1494		c->isfloating = c->oldstate;
1495		c->bw = c->oldbw;
1496		c->x = c->oldx;
1497		c->y = c->oldy;
1498		c->w = c->oldw;
1499		c->h = c->oldh;
1500		resizeclient(c, c->x, c->y, c->w, c->h);
1501		arrange(c->mon);
1502	}
1503}
1504
1505void
1506setlayout(const Arg *arg)
1507{
1508	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1509		selmon->sellt ^= 1;
1510	if (arg && arg->v)
1511		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1512	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1513	if (selmon->sel)
1514		arrange(selmon);
1515	else
1516		drawbar(selmon);
1517}
1518
1519/* arg > 1.0 will set mfact absolutely */
1520void
1521setmfact(const Arg *arg)
1522{
1523	float f;
1524
1525	if (!arg || !selmon->lt[selmon->sellt]->arrange)
1526		return;
1527	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1528	if (f < 0.1 || f > 0.9)
1529		return;
1530	selmon->mfact = f;
1531	arrange(selmon);
1532}
1533
1534void
1535setup(void)
1536{
1537	int i;
1538	XSetWindowAttributes wa;
1539	Atom utf8string;
1540
1541	/* clean up any zombies immediately */
1542	sigchld(0);
1543
1544	/* init screen */
1545	screen = DefaultScreen(dpy);
1546	sw = DisplayWidth(dpy, screen);
1547	sh = DisplayHeight(dpy, screen);
1548	root = RootWindow(dpy, screen);
1549	drw = drw_create(dpy, screen, root, sw, sh);
1550	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1551		die("no fonts could be loaded.");
1552	lrpad = drw->fonts->h;
1553	bh = drw->fonts->h + 2;
1554	updategeom();
1555	/* init atoms */
1556	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1557	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1558	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1559	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1560	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1561	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1562	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1563	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1564	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1565	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1566	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1567	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1568	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1569	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1570	/* init cursors */
1571	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1572	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1573	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1574	/* init appearance */
1575	scheme = ecalloc(LENGTH(colors), sizeof(Scm));
1576	for (i = 0; i < LENGTH(colors); i++)
1577		scheme[i] = drw_scm_create(drw, colors[i], 3);
1578	/* init bars */
1579	updatebars();
1580	updatestatus();
1581	/* supporting window for NetWMCheck */
1582	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1583	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1584	                PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1585	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1586	                PropModeReplace, (unsigned char *) "dwm", 4);
1587	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1588	                PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1589	/* EWMH support per view */
1590	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1591	                PropModeReplace, (unsigned char *) netatom, NetLast);
1592	XDeleteProperty(dpy, root, netatom[NetClientList]);
1593	/* select events */
1594	wa.cursor = cursor[CurNormal]->cursor;
1595	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1596	                |ButtonPressMask|PointerMotionMask|EnterWindowMask
1597	                |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1598	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1599	XSelectInput(dpy, root, wa.event_mask);
1600	grabkeys();
1601	focus(NULL);
1602}
1603
1604
1605void
1606seturgent(Client *c, int urg)
1607{
1608	XWMHints *wmh;
1609
1610	c->isurgent = urg;
1611	if (!(wmh = XGetWMHints(dpy, c->win)))
1612		return;
1613	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1614	XSetWMHints(dpy, c->win, wmh);
1615	XFree(wmh);
1616}
1617
1618void
1619showhide(Client *c)
1620{
1621	if (!c)
1622		return;
1623	if (ISVISIBLE(c)) {
1624		/* show clients top down */
1625		XMoveWindow(dpy, c->win, c->x, c->y);
1626		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1627			resize(c, c->x, c->y, c->w, c->h, 0);
1628		showhide(c->snext);
1629	} else {
1630		/* hide clients bottom up */
1631		showhide(c->snext);
1632		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1633	}
1634}
1635
1636void
1637sigchld(int unused)
1638{
1639	if (signal(SIGCHLD, sigchld) == SIG_ERR)
1640		die("can't install SIGCHLD handler:");
1641	while (0 < waitpid(-1, NULL, WNOHANG));
1642}
1643
1644void
1645spawn(const Arg *arg)
1646{
1647	if (arg->v == dmenucmd)
1648		dmenumon[0] = '0' + selmon->num;
1649	if (fork() == 0) {
1650		if (dpy)
1651			close(ConnectionNumber(dpy));
1652		setsid();
1653		execvp(((char **)arg->v)[0], (char **)arg->v);
1654		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1655		perror(" failed");
1656		exit(EXIT_SUCCESS);
1657	}
1658}
1659
1660void
1661tag(const Arg *arg)
1662{
1663	if (selmon->sel && arg->ui & TAGMASK) {
1664		selmon->sel->tags = arg->ui & TAGMASK;
1665		focus(NULL);
1666		arrange(selmon);
1667	}
1668}
1669
1670void
1671tagmon(const Arg *arg)
1672{
1673	if (!selmon->sel || !mons->next)
1674		return;
1675	sendmon(selmon->sel, dirtomon(arg->i));
1676}
1677
1678void
1679tile(Monitor *m)
1680{
1681	unsigned int i, n, h, mw, my, ty;
1682	Client *c;
1683
1684	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1685	if (n == 0)
1686		return;
1687
1688	if (n > m->nmaster)
1689		mw = m->nmaster ? m->ww * m->mfact : 0;
1690	else
1691		mw = m->ww;
1692	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1693		if (i < m->nmaster) {
1694			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1695			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1696			my += HEIGHT(c);
1697		} else {
1698			h = (m->wh - ty) / (n - i);
1699			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1700			ty += HEIGHT(c);
1701		}
1702}
1703
1704void
1705togglebar(const Arg *arg)
1706{
1707	selmon->showbar = !selmon->showbar;
1708	updatebarpos(selmon);
1709	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1710	arrange(selmon);
1711}
1712
1713void
1714togglefloating(const Arg *arg)
1715{
1716	if (!selmon->sel)
1717		return;
1718	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1719		return;
1720	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1721	if (selmon->sel->isfloating)
1722		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1723		       selmon->sel->w, selmon->sel->h, 0);
1724	arrange(selmon);
1725}
1726
1727void
1728toggletag(const Arg *arg)
1729{
1730	unsigned int newtags;
1731
1732	if (!selmon->sel)
1733		return;
1734	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1735	if (newtags) {
1736		selmon->sel->tags = newtags;
1737		focus(NULL);
1738		arrange(selmon);
1739	}
1740}
1741
1742void
1743toggleview(const Arg *arg)
1744{
1745	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1746
1747	if (newtagset) {
1748		selmon->tagset[selmon->seltags] = newtagset;
1749		focus(NULL);
1750		arrange(selmon);
1751	}
1752}
1753
1754void
1755unfocus(Client *c, int setfocus)
1756{
1757	if (!c)
1758		return;
1759	grabbuttons(c, 0);
1760	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1761	if (setfocus) {
1762		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1763		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1764	}
1765}
1766
1767void
1768unmanage(Client *c, int destroyed)
1769{
1770	Monitor *m = c->mon;
1771	XWindowChanges wc;
1772
1773	detach(c);
1774	detachstack(c);
1775	if (!destroyed) {
1776		wc.border_width = c->oldbw;
1777		XGrabServer(dpy); /* avoid race conditions */
1778		XSetErrorHandler(xerrordummy);
1779		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1780		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1781		setclientstate(c, WithdrawnState);
1782		XSync(dpy, False);
1783		XSetErrorHandler(xerror);
1784		XUngrabServer(dpy);
1785	}
1786	free(c);
1787	focus(NULL);
1788	updateclientlist();
1789	arrange(m);
1790}
1791
1792void
1793unmapnotify(XEvent *e)
1794{
1795	Client *c;
1796	XUnmapEvent *ev = &e->xunmap;
1797
1798	if ((c = wintoclient(ev->window))) {
1799		if (ev->send_event)
1800			setclientstate(c, WithdrawnState);
1801		else
1802			unmanage(c, 0);
1803	}
1804}
1805
1806void
1807updatebars(void)
1808{
1809	Monitor *m;
1810	XSetWindowAttributes wa = {
1811		.override_redirect = True,
1812		.background_pixmap = ParentRelative,
1813		.event_mask = ButtonPressMask|ExposureMask
1814	};
1815	for (m = mons; m; m = m->next) {
1816		if (m->barwin)
1817			continue;
1818		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1819		                          CopyFromParent, DefaultVisual(dpy, screen),
1820		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1821		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1822		XMapRaised(dpy, m->barwin);
1823	}
1824}
1825
1826void
1827updatebarpos(Monitor *m)
1828{
1829	m->wy = m->my;
1830	m->wh = m->mh;
1831	if (m->showbar) {
1832		m->wh -= bh;
1833		m->by = m->topbar ? m->wy : m->wy + m->wh;
1834		m->wy = m->topbar ? m->wy + bh : m->wy;
1835	} else
1836		m->by = -bh;
1837}
1838
1839void
1840updateclientlist()
1841{
1842	Client *c;
1843	Monitor *m;
1844
1845	XDeleteProperty(dpy, root, netatom[NetClientList]);
1846	for (m = mons; m; m = m->next)
1847		for (c = m->clients; c; c = c->next)
1848			XChangeProperty(dpy, root, netatom[NetClientList],
1849			                XA_WINDOW, 32, PropModeAppend,
1850			                (unsigned char *) &(c->win), 1);
1851}
1852
1853int
1854updategeom(void)
1855{
1856	int dirty = 0;
1857
1858#ifdef XINERAMA
1859	if (XineramaIsActive(dpy)) {
1860		int i, j, n, nn;
1861		Client *c;
1862		Monitor *m;
1863		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1864		XineramaScreenInfo *unique = NULL;
1865
1866		for (n = 0, m = mons; m; m = m->next, n++);
1867		/* only consider unique geometries as separate screens */
1868		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1869		for (i = 0, j = 0; i < nn; i++)
1870			if (isuniquegeom(unique, j, &info[i]))
1871				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1872		XFree(info);
1873		nn = j;
1874		if (n <= nn) { /* new monitors available */
1875			for (i = 0; i < (nn - n); i++) {
1876				for (m = mons; m && m->next; m = m->next);
1877				if (m)
1878					m->next = createmon();
1879				else
1880					mons = createmon();
1881			}
1882			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1883				if (i >= n
1884				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
1885				|| unique[i].width != m->mw || unique[i].height != m->mh)
1886				{
1887					dirty = 1;
1888					m->num = i;
1889					m->mx = m->wx = unique[i].x_org;
1890					m->my = m->wy = unique[i].y_org;
1891					m->mw = m->ww = unique[i].width;
1892					m->mh = m->wh = unique[i].height;
1893					updatebarpos(m);
1894				}
1895		} else { /* less monitors available nn < n */
1896			for (i = nn; i < n; i++) {
1897				for (m = mons; m && m->next; m = m->next);
1898				while ((c = m->clients)) {
1899					dirty = 1;
1900					m->clients = c->next;
1901					detachstack(c);
1902					c->mon = mons;
1903					attach(c);
1904					attachstack(c);
1905				}
1906				if (m == selmon)
1907					selmon = mons;
1908				cleanupmon(m);
1909			}
1910		}
1911		free(unique);
1912	} else
1913#endif /* XINERAMA */
1914	{ /* default monitor setup */
1915		if (!mons)
1916			mons = createmon();
1917		if (mons->mw != sw || mons->mh != sh) {
1918			dirty = 1;
1919			mons->mw = mons->ww = sw;
1920			mons->mh = mons->wh = sh;
1921			updatebarpos(mons);
1922		}
1923	}
1924	if (dirty) {
1925		selmon = mons;
1926		selmon = wintomon(root);
1927	}
1928	return dirty;
1929}
1930
1931void
1932updatenumlockmask(void)
1933{
1934	unsigned int i, j;
1935	XModifierKeymap *modmap;
1936
1937	numlockmask = 0;
1938	modmap = XGetModifierMapping(dpy);
1939	for (i = 0; i < 8; i++)
1940		for (j = 0; j < modmap->max_keypermod; j++)
1941			if (modmap->modifiermap[i * modmap->max_keypermod + j]
1942			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1943				numlockmask = (1 << i);
1944	XFreeModifiermap(modmap);
1945}
1946
1947void
1948updatesizehints(Client *c)
1949{
1950	long msize;
1951	XSizeHints size;
1952
1953	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1954		/* size is uninitialized, ensure that size.flags aren't used */
1955		size.flags = PSize;
1956	if (size.flags & PBaseSize) {
1957		c->basew = size.base_width;
1958		c->baseh = size.base_height;
1959	} else if (size.flags & PMinSize) {
1960		c->basew = size.min_width;
1961		c->baseh = size.min_height;
1962	} else
1963		c->basew = c->baseh = 0;
1964	if (size.flags & PResizeInc) {
1965		c->incw = size.width_inc;
1966		c->inch = size.height_inc;
1967	} else
1968		c->incw = c->inch = 0;
1969	if (size.flags & PMaxSize) {
1970		c->maxw = size.max_width;
1971		c->maxh = size.max_height;
1972	} else
1973		c->maxw = c->maxh = 0;
1974	if (size.flags & PMinSize) {
1975		c->minw = size.min_width;
1976		c->minh = size.min_height;
1977	} else if (size.flags & PBaseSize) {
1978		c->minw = size.base_width;
1979		c->minh = size.base_height;
1980	} else
1981		c->minw = c->minh = 0;
1982	if (size.flags & PAspect) {
1983		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1984		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1985	} else
1986		c->maxa = c->mina = 0.0;
1987	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1988	              && c->maxw == c->minw && c->maxh == c->minh);
1989}
1990
1991void
1992updatetitle(Client *c)
1993{
1994	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1995		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1996	if (c->name[0] == '\0') /* hack to mark broken clients */
1997		strcpy(c->name, broken);
1998}
1999
2000void
2001updatestatus(void)
2002{
2003	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2004		strcpy(stext, "dwm-"VERSION);
2005	drawbar(selmon);
2006}
2007
2008void
2009updatewindowtype(Client *c)
2010{
2011	Atom state = getatomprop(c, netatom[NetWMState]);
2012	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2013
2014	if (state == netatom[NetWMFullscreen])
2015		setfullscreen(c, 1);
2016	if (wtype == netatom[NetWMWindowTypeDialog])
2017		c->isfloating = 1;
2018}
2019
2020void
2021updatewmhints(Client *c)
2022{
2023	XWMHints *wmh;
2024
2025	if ((wmh = XGetWMHints(dpy, c->win))) {
2026		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2027			wmh->flags &= ~XUrgencyHint;
2028			XSetWMHints(dpy, c->win, wmh);
2029		} else
2030			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2031		if (wmh->flags & InputHint)
2032			c->neverfocus = !wmh->input;
2033		else
2034			c->neverfocus = 0;
2035		XFree(wmh);
2036	}
2037}
2038
2039void
2040view(const Arg *arg)
2041{
2042	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2043		return;
2044	selmon->seltags ^= 1; /* toggle sel tagset */
2045	if (arg->ui & TAGMASK)
2046		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2047	focus(NULL);
2048	arrange(selmon);
2049}
2050
2051Client *
2052wintoclient(Window w)
2053{
2054	Client *c;
2055	Monitor *m;
2056
2057	for (m = mons; m; m = m->next)
2058		for (c = m->clients; c; c = c->next)
2059			if (c->win == w)
2060				return c;
2061	return NULL;
2062}
2063
2064Monitor *
2065wintomon(Window w)
2066{
2067	int x, y;
2068	Client *c;
2069	Monitor *m;
2070
2071	if (w == root && getrootptr(&x, &y))
2072		return recttomon(x, y, 1, 1);
2073	for (m = mons; m; m = m->next)
2074		if (w == m->barwin)
2075			return m;
2076	if ((c = wintoclient(w)))
2077		return c->mon;
2078	return selmon;
2079}
2080
2081/* There's no way to check accesses to destroyed windows, thus those cases are
2082 * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2083 * default error handler, which may call exit. */
2084int
2085xerror(Display *dpy, XErrorEvent *ee)
2086{
2087	if (ee->error_code == BadWindow
2088	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2089	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2090	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2091	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2092	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2093	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2094	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2095	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2096		return 0;
2097	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2098	        ee->request_code, ee->error_code);
2099	return xerrorxlib(dpy, ee); /* may call exit */
2100}
2101
2102int
2103xerrordummy(Display *dpy, XErrorEvent *ee)
2104{
2105	return 0;
2106}
2107
2108/* Startup Error handler to check if another window manager
2109 * is already running. */
2110int
2111xerrorstart(Display *dpy, XErrorEvent *ee)
2112{
2113	die("dwm: another window manager is already running");
2114	return -1;
2115}
2116
2117void
2118zoom(const Arg *arg)
2119{
2120	Client *c = selmon->sel;
2121
2122	if (!selmon->lt[selmon->sellt]->arrange
2123	|| (selmon->sel && selmon->sel->isfloating))
2124		return;
2125	if (c == nexttiled(selmon->clients))
2126		if (!c || !(c = nexttiled(c->next)))
2127			return;
2128	pop(c);
2129}
2130
2131int
2132main(int argc, char *argv[])
2133{
2134	if (argc == 2 && !strcmp("-v", argv[1]))
2135		die("dwm-"VERSION);
2136	else if (argc != 1)
2137		die("usage: dwm [-v]");
2138	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2139		fputs("warning: no locale support\n", stderr);
2140	if (!(dpy = XOpenDisplay(NULL)))
2141		die("dwm: cannot open display");
2142	checkotherwm();
2143	setup();
2144	scan();
2145	run();
2146	cleanup();
2147	XCloseDisplay(dpy);
2148	return EXIT_SUCCESS;
2149}