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		click = ClkClientWin;
 450	}
 451	for (i = 0; i < LENGTH(buttons); i++)
 452		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 453		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 454			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 455}
 456
 457void
 458checkotherwm(void)
 459{
 460	xerrorxlib = XSetErrorHandler(xerrorstart);
 461	/* this causes an error if some other window manager is running */
 462	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 463	XSync(dpy, False);
 464	XSetErrorHandler(xerror);
 465	XSync(dpy, False);
 466}
 467
 468void
 469cleanup(void)
 470{
 471	Arg a = {.ui = ~0};
 472	Layout foo = { "", NULL };
 473	Monitor *m;
 474	size_t i;
 475
 476	view(&a);
 477	selmon->lt[selmon->sellt] = &foo;
 478	for (m = mons; m; m = m->next)
 479		while (m->stack)
 480			unmanage(m->stack, 0);
 481	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 482	while (mons)
 483		cleanupmon(mons);
 484	for (i = 0; i < CurLast; i++)
 485		drw_cur_free(drw, cursor[i]);
 486	for (i = 0; i < LENGTH(colors); i++)
 487		free(scheme[i]);
 488	XDestroyWindow(dpy, wmcheckwin);
 489	drw_free(drw);
 490	XSync(dpy, False);
 491	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 492	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 493}
 494
 495void
 496cleanupmon(Monitor *mon)
 497{
 498	Monitor *m;
 499
 500	if (mon == mons)
 501		mons = mons->next;
 502	else {
 503		for (m = mons; m && m->next != mon; m = m->next);
 504		m->next = mon->next;
 505	}
 506	XUnmapWindow(dpy, mon->barwin);
 507	XDestroyWindow(dpy, mon->barwin);
 508	free(mon);
 509}
 510
 511void
 512clientmessage(XEvent *e)
 513{
 514	XClientMessageEvent *cme = &e->xclient;
 515	Client *c = wintoclient(cme->window);
 516
 517	if (!c)
 518		return;
 519	if (cme->message_type == netatom[NetWMState]) {
 520		if (cme->data.l[1] == netatom[NetWMFullscreen]
 521		|| cme->data.l[2] == netatom[NetWMFullscreen])
 522			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 523			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 524	} else if (cme->message_type == netatom[NetActiveWindow]) {
 525		if (c != selmon->sel && !c->isurgent)
 526			seturgent(c, 1);
 527	}
 528}
 529
 530void
 531configure(Client *c)
 532{
 533	XConfigureEvent ce;
 534
 535	ce.type = ConfigureNotify;
 536	ce.display = dpy;
 537	ce.event = c->win;
 538	ce.window = c->win;
 539	ce.x = c->x;
 540	ce.y = c->y;
 541	ce.width = c->w;
 542	ce.height = c->h;
 543	ce.border_width = c->bw;
 544	ce.above = None;
 545	ce.override_redirect = False;
 546	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 547}
 548
 549void
 550configurenotify(XEvent *e)
 551{
 552	Monitor *m;
 553	Client *c;
 554	XConfigureEvent *ev = &e->xconfigure;
 555	int dirty;
 556
 557	/* TODO: updategeom handling sucks, needs to be simplified */
 558	if (ev->window == root) {
 559		dirty = (sw != ev->width || sh != ev->height);
 560		sw = ev->width;
 561		sh = ev->height;
 562		if (updategeom() || dirty) {
 563			drw_resize(drw, sw, bh);
 564			updatebars();
 565			for (m = mons; m; m = m->next) {
 566				for (c = m->clients; c; c = c->next)
 567					if (c->isfullscreen)
 568						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 569				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 570			}
 571			focus(NULL);
 572			arrange(NULL);
 573		}
 574	}
 575}
 576
 577void
 578configurerequest(XEvent *e)
 579{
 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		} else
 615			configure(c);
 616	} else {
 617		wc.x = ev->x;
 618		wc.y = ev->y;
 619		wc.width = ev->width;
 620		wc.height = ev->height;
 621		wc.border_width = ev->border_width;
 622		wc.sibling = ev->above;
 623		wc.stack_mode = ev->detail;
 624		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 625	}
 626	XSync(dpy, False);
 627}
 628
 629Monitor *
 630createmon(void)
 631{
 632	Monitor *m;
 633
 634	m = ecalloc(1, sizeof(Monitor));
 635	m->tagset[0] = m->tagset[1] = 1;
 636	m->mfact = mfact;
 637	m->nmaster = nmaster;
 638	m->showbar = showbar;
 639	m->topbar = topbar;
 640	m->lt[0] = &layouts[0];
 641	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 642	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 643	return m;
 644}
 645
 646void
 647destroynotify(XEvent *e)
 648{
 649	Client *c;
 650	XDestroyWindowEvent *ev = &e->xdestroywindow;
 651
 652	if ((c = wintoclient(ev->window)))
 653		unmanage(c, 1);
 654}
 655
 656void
 657detach(Client *c)
 658{
 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{
 668	Client **tc, *t;
 669
 670	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 671	*tc = c->snext;
 672
 673	if (c == c->mon->sel) {
 674		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 675		c->mon->sel = t;
 676	}
 677}
 678
 679Monitor *
 680dirtomon(int dir)
 681{
 682	Monitor *m = NULL;
 683
 684	if (dir > 0) {
 685		if (!(m = selmon->next))
 686			m = mons;
 687	} else if (selmon == mons)
 688		for (m = mons; m->next; m = m->next);
 689	else
 690		for (m = mons; m->next != selmon; m = m->next);
 691	return m;
 692}
 693
 694void
 695drawbar(Monitor *m)
 696{
 697	int x, w, sw = 0;
 698	int boxs = drw->fonts->h / 9;
 699	int boxw = drw->fonts->h / 6 + 2;
 700	unsigned int i, occ = 0, urg = 0;
 701	Client *c;
 702
 703	/* draw status first so it can be overdrawn by tags later */
 704	if (m == selmon) { /* status is only drawn on selected monitor */
 705		drw_setscheme(drw, scheme[SchemeNorm]);
 706		sw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 707		drw_text(drw, m->ww - sw, 0, sw, bh, 0, stext, 0);
 708	}
 709
 710	for (c = m->clients; c; c = c->next) {
 711		occ |= c->tags;
 712		if (c->isurgent)
 713			urg |= c->tags;
 714	}
 715	x = 0;
 716	for (i = 0; i < LENGTH(tags); i++) {
 717		w = TEXTW(tags[i]);
 718		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 719		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 720		if (occ & 1 << i)
 721			drw_rect(drw, x + boxs, boxs, boxw, boxw,
 722			         m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 723			         urg & 1 << i);
 724		x += w;
 725	}
 726	w = blw = TEXTW(m->ltsymbol);
 727	drw_setscheme(drw, scheme[SchemeNorm]);
 728	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 729
 730	if ((w = m->ww - sw - x) > bh) {
 731		if (m->sel) {
 732			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 733			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 734			if (m->sel->isfloating)
 735				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 736		} else {
 737			drw_setscheme(drw, scheme[SchemeNorm]);
 738			drw_rect(drw, x, 0, w, bh, 1, 1);
 739		}
 740	}
 741	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 742}
 743
 744void
 745drawbars(void)
 746{
 747	Monitor *m;
 748
 749	for (m = mons; m; m = m->next)
 750		drawbar(m);
 751}
 752
 753void
 754enternotify(XEvent *e)
 755{
 756	Client *c;
 757	Monitor *m;
 758	XCrossingEvent *ev = &e->xcrossing;
 759
 760	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 761		return;
 762	c = wintoclient(ev->window);
 763	m = c ? c->mon : wintomon(ev->window);
 764	if (m != selmon) {
 765		unfocus(selmon->sel, 1);
 766		selmon = m;
 767	} else if (!c || c == selmon->sel)
 768		return;
 769	focus(c);
 770}
 771
 772void
 773expose(XEvent *e)
 774{
 775	Monitor *m;
 776	XExposeEvent *ev = &e->xexpose;
 777
 778	if (ev->count == 0 && (m = wintomon(ev->window)))
 779		drawbar(m);
 780}
 781
 782void
 783focus(Client *c)
 784{
 785	if (!c || !ISVISIBLE(c))
 786		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 787	if (selmon->sel && selmon->sel != c)
 788		unfocus(selmon->sel, 0);
 789	if (c) {
 790		if (c->mon != selmon)
 791			selmon = c->mon;
 792		if (c->isurgent)
 793			seturgent(c, 0);
 794		detachstack(c);
 795		attachstack(c);
 796		grabbuttons(c, 1);
 797		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 798		setfocus(c);
 799	} else {
 800		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 801		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 802	}
 803	selmon->sel = c;
 804	drawbars();
 805}
 806
 807/* there are some broken focus acquiring clients needing extra handling */
 808void
 809focusin(XEvent *e)
 810{
 811	XFocusChangeEvent *ev = &e->xfocus;
 812
 813	if (selmon->sel && ev->window != selmon->sel->win)
 814		setfocus(selmon->sel);
 815}
 816
 817void
 818focusmon(const Arg *arg)
 819{
 820	Monitor *m;
 821
 822	if (!mons->next)
 823		return;
 824	if ((m = dirtomon(arg->i)) == selmon)
 825		return;
 826	unfocus(selmon->sel, 0);
 827	selmon = m;
 828	focus(NULL);
 829}
 830
 831void
 832focusstack(const Arg *arg)
 833{
 834	Client *c = NULL, *i;
 835
 836	if (!selmon->sel)
 837		return;
 838	if (arg->i > 0) {
 839		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 840		if (!c)
 841			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 842	} else {
 843		for (i = selmon->clients; i != selmon->sel; i = i->next)
 844			if (ISVISIBLE(i))
 845				c = i;
 846		if (!c)
 847			for (; i; i = i->next)
 848				if (ISVISIBLE(i))
 849					c = i;
 850	}
 851	if (c) {
 852		focus(c);
 853		restack(selmon);
 854	}
 855}
 856
 857Atom
 858getatomprop(Client *c, Atom prop)
 859{
 860	int di;
 861	unsigned long dl;
 862	unsigned char *p = NULL;
 863	Atom da, atom = None;
 864
 865	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 866	                      &da, &di, &dl, &dl, &p) == Success && p) {
 867		atom = *(Atom *)p;
 868		XFree(p);
 869	}
 870	return atom;
 871}
 872
 873int
 874getrootptr(int *x, int *y)
 875{
 876	int di;
 877	unsigned int dui;
 878	Window dummy;
 879
 880	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 881}
 882
 883long
 884getstate(Window w)
 885{
 886	int format;
 887	long result = -1;
 888	unsigned char *p = NULL;
 889	unsigned long n, extra;
 890	Atom real;
 891
 892	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 893	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 894		return -1;
 895	if (n != 0)
 896		result = *p;
 897	XFree(p);
 898	return result;
 899}
 900
 901int
 902gettextprop(Window w, Atom atom, char *text, unsigned int size)
 903{
 904	char **list = NULL;
 905	int n;
 906	XTextProperty name;
 907
 908	if (!text || size == 0)
 909		return 0;
 910	text[0] = '\0';
 911	XGetTextProperty(dpy, w, &name, atom);
 912	if (!name.nitems)
 913		return 0;
 914	if (name.encoding == XA_STRING)
 915		strncpy(text, (char *)name.value, size - 1);
 916	else {
 917		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 918			strncpy(text, *list, size - 1);
 919			XFreeStringList(list);
 920		}
 921	}
 922	text[size - 1] = '\0';
 923	XFree(name.value);
 924	return 1;
 925}
 926
 927void
 928grabbuttons(Client *c, int focused)
 929{
 930	updatenumlockmask();
 931	{
 932		unsigned int i, j;
 933		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 934		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 935		if (focused) {
 936			for (i = 0; i < LENGTH(buttons); i++)
 937				if (buttons[i].click == ClkClientWin)
 938					for (j = 0; j < LENGTH(modifiers); j++)
 939						XGrabButton(dpy, buttons[i].button,
 940						            buttons[i].mask | modifiers[j],
 941						            c->win, False, BUTTONMASK,
 942						            GrabModeAsync, GrabModeSync, None, None);
 943		} else
 944			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 945			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 946	}
 947}
 948
 949void
 950grabkeys(void)
 951{
 952	updatenumlockmask();
 953	{
 954		unsigned int i, j;
 955		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 956		KeyCode code;
 957
 958		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 959		for (i = 0; i < LENGTH(keys); i++)
 960			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 961				for (j = 0; j < LENGTH(modifiers); j++)
 962					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 963					         True, GrabModeAsync, GrabModeAsync);
 964	}
 965}
 966
 967void
 968incnmaster(const Arg *arg)
 969{
 970	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 971	arrange(selmon);
 972}
 973
 974#ifdef XINERAMA
 975static int
 976isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 977{
 978	while (n--)
 979		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 980		&& unique[n].width == info->width && unique[n].height == info->height)
 981			return 0;
 982	return 1;
 983}
 984#endif /* XINERAMA */
 985
 986void
 987keypress(XEvent *e)
 988{
 989	unsigned int i;
 990	KeySym keysym;
 991	XKeyEvent *ev;
 992
 993	ev = &e->xkey;
 994	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 995	for (i = 0; i < LENGTH(keys); i++)
 996		if (keysym == keys[i].keysym
 997		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 998		&& keys[i].func)
 999			keys[i].func(&(keys[i].arg));
1000}
1001
1002void
1003killclient(const Arg *arg)
1004{
1005	if (!selmon->sel)
1006		return;
1007	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1008		XGrabServer(dpy);
1009		XSetErrorHandler(xerrordummy);
1010		XSetCloseDownMode(dpy, DestroyAll);
1011		XKillClient(dpy, selmon->sel->win);
1012		XSync(dpy, False);
1013		XSetErrorHandler(xerror);
1014		XUngrabServer(dpy);
1015	}
1016}
1017
1018void
1019manage(Window w, XWindowAttributes *wa)
1020{
1021	Client *c, *t = NULL;
1022	Window trans = None;
1023	XWindowChanges wc;
1024
1025	c = ecalloc(1, sizeof(Client));
1026	c->win = w;
1027	/* geometry */
1028	c->x = c->oldx = wa->x;
1029	c->y = c->oldy = wa->y;
1030	c->w = c->oldw = wa->width;
1031	c->h = c->oldh = wa->height;
1032	c->oldbw = wa->border_width;
1033
1034	updatetitle(c);
1035	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1036		c->mon = t->mon;
1037		c->tags = t->tags;
1038	} else {
1039		c->mon = selmon;
1040		applyrules(c);
1041	}
1042
1043	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1044		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1045	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1046		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1047	c->x = MAX(c->x, c->mon->mx);
1048	/* only fix client y-offset, if the client center might cover the bar */
1049	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1050	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1051	c->bw = borderpx;
1052
1053	wc.border_width = c->bw;
1054	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1055	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1056	configure(c); /* propagates border_width, if size doesn't change */
1057	updatewindowtype(c);
1058	updatesizehints(c);
1059	updatewmhints(c);
1060	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1061	grabbuttons(c, 0);
1062	if (!c->isfloating)
1063		c->isfloating = c->oldstate = trans != None || c->isfixed;
1064	if (c->isfloating)
1065		XRaiseWindow(dpy, c->win);
1066	attach(c);
1067	attachstack(c);
1068	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1069	                (unsigned char *) &(c->win), 1);
1070	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1071	setclientstate(c, NormalState);
1072	if (c->mon == selmon)
1073		unfocus(selmon->sel, 0);
1074	c->mon->sel = c;
1075	arrange(c->mon);
1076	XMapWindow(dpy, c->win);
1077	focus(NULL);
1078}
1079
1080void
1081mappingnotify(XEvent *e)
1082{
1083	XMappingEvent *ev = &e->xmapping;
1084
1085	XRefreshKeyboardMapping(ev);
1086	if (ev->request == MappingKeyboard)
1087		grabkeys();
1088}
1089
1090void
1091maprequest(XEvent *e)
1092{
1093	static XWindowAttributes wa;
1094	XMapRequestEvent *ev = &e->xmaprequest;
1095
1096	if (!XGetWindowAttributes(dpy, ev->window, &wa))
1097		return;
1098	if (wa.override_redirect)
1099		return;
1100	if (!wintoclient(ev->window))
1101		manage(ev->window, &wa);
1102}
1103
1104void
1105monocle(Monitor *m)
1106{
1107	unsigned int n = 0;
1108	Client *c;
1109
1110	for (c = m->clients; c; c = c->next)
1111		if (ISVISIBLE(c))
1112			n++;
1113	if (n > 0) /* override layout symbol */
1114		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1115	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1116		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1117}
1118
1119void
1120motionnotify(XEvent *e)
1121{
1122	static Monitor *mon = NULL;
1123	Monitor *m;
1124	XMotionEvent *ev = &e->xmotion;
1125
1126	if (ev->window != root)
1127		return;
1128	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1129		unfocus(selmon->sel, 1);
1130		selmon = m;
1131		focus(NULL);
1132	}
1133	mon = m;
1134}
1135
1136void
1137movemouse(const Arg *arg)
1138{
1139	int x, y, ocx, ocy, nx, ny;
1140	Client *c;
1141	Monitor *m;
1142	XEvent ev;
1143	Time lasttime = 0;
1144
1145	if (!(c = selmon->sel))
1146		return;
1147	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1148		return;
1149	restack(selmon);
1150	ocx = c->x;
1151	ocy = c->y;
1152	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1153	    None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1154		return;
1155	if (!getrootptr(&x, &y))
1156		return;
1157	do {
1158		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1159		switch(ev.type) {
1160		case ConfigureRequest:
1161		case Expose:
1162		case MapRequest:
1163			handler[ev.type](&ev);
1164			break;
1165		case MotionNotify:
1166			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1167				continue;
1168			lasttime = ev.xmotion.time;
1169
1170			nx = ocx + (ev.xmotion.x - x);
1171			ny = ocy + (ev.xmotion.y - y);
1172			if (nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1173			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1174				if (abs(selmon->wx - nx) < snap)
1175					nx = selmon->wx;
1176				else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1177					nx = selmon->wx + selmon->ww - WIDTH(c);
1178				if (abs(selmon->wy - ny) < snap)
1179					ny = selmon->wy;
1180				else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1181					ny = selmon->wy + selmon->wh - HEIGHT(c);
1182				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1183				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1184					togglefloating(NULL);
1185			}
1186			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1187				resize(c, nx, ny, c->w, c->h, 1);
1188			break;
1189		}
1190	} while (ev.type != ButtonRelease);
1191	XUngrabPointer(dpy, CurrentTime);
1192	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1193		sendmon(c, m);
1194		selmon = m;
1195		focus(NULL);
1196	}
1197}
1198
1199Client *
1200nexttiled(Client *c)
1201{
1202	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1203	return c;
1204}
1205
1206void
1207pop(Client *c)
1208{
1209	detach(c);
1210	attach(c);
1211	focus(c);
1212	arrange(c->mon);
1213}
1214
1215void
1216propertynotify(XEvent *e)
1217{
1218	Client *c;
1219	Window trans;
1220	XPropertyEvent *ev = &e->xproperty;
1221
1222	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1223		updatestatus();
1224	else if (ev->state == PropertyDelete)
1225		return; /* ignore */
1226	else if ((c = wintoclient(ev->window))) {
1227		switch(ev->atom) {
1228		default: break;
1229		case XA_WM_TRANSIENT_FOR:
1230			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1231			   (c->isfloating = (wintoclient(trans)) != NULL))
1232				arrange(c->mon);
1233			break;
1234		case XA_WM_NORMAL_HINTS:
1235			updatesizehints(c);
1236			break;
1237		case XA_WM_HINTS:
1238			updatewmhints(c);
1239			drawbars();
1240			break;
1241		}
1242		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1243			updatetitle(c);
1244			if (c == c->mon->sel)
1245				drawbar(c->mon);
1246		}
1247		if (ev->atom == netatom[NetWMWindowType])
1248			updatewindowtype(c);
1249	}
1250}
1251
1252void
1253quit(const Arg *arg)
1254{
1255	running = 0;
1256}
1257
1258Monitor *
1259recttomon(int x, int y, int w, int h)
1260{
1261	Monitor *m, *r = selmon;
1262	int a, area = 0;
1263
1264	for (m = mons; m; m = m->next)
1265		if ((a = INTERSECT(x, y, w, h, m)) > area) {
1266			area = a;
1267			r = m;
1268		}
1269	return r;
1270}
1271
1272void
1273resize(Client *c, int x, int y, int w, int h, int interact)
1274{
1275	if (applysizehints(c, &x, &y, &w, &h, interact))
1276		resizeclient(c, x, y, w, h);
1277}
1278
1279void
1280resizeclient(Client *c, int x, int y, int w, int h)
1281{
1282	XWindowChanges wc;
1283
1284	c->oldx = c->x; c->x = wc.x = x;
1285	c->oldy = c->y; c->y = wc.y = y;
1286	c->oldw = c->w; c->w = wc.width = w;
1287	c->oldh = c->h; c->h = wc.height = h;
1288	wc.border_width = c->bw;
1289	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1290	configure(c);
1291	XSync(dpy, False);
1292}
1293
1294void
1295resizemouse(const Arg *arg)
1296{
1297	int ocx, ocy, nw, nh;
1298	Client *c;
1299	Monitor *m;
1300	XEvent ev;
1301	Time lasttime = 0;
1302
1303	if (!(c = selmon->sel))
1304		return;
1305	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1306		return;
1307	restack(selmon);
1308	ocx = c->x;
1309	ocy = c->y;
1310	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1311	                None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1312		return;
1313	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1314	do {
1315		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1316		switch(ev.type) {
1317		case ConfigureRequest:
1318		case Expose:
1319		case MapRequest:
1320			handler[ev.type](&ev);
1321			break;
1322		case MotionNotify:
1323			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1324				continue;
1325			lasttime = ev.xmotion.time;
1326
1327			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1328			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1329			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1330			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1331			{
1332				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1333				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1334					togglefloating(NULL);
1335			}
1336			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1337				resize(c, c->x, c->y, nw, nh, 1);
1338			break;
1339		}
1340	} while (ev.type != ButtonRelease);
1341	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1342	XUngrabPointer(dpy, CurrentTime);
1343	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1344	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1345		sendmon(c, m);
1346		selmon = m;
1347		focus(NULL);
1348	}
1349}
1350
1351void
1352restack(Monitor *m)
1353{
1354	Client *c;
1355	XEvent ev;
1356	XWindowChanges wc;
1357
1358	drawbar(m);
1359	if (!m->sel)
1360		return;
1361	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1362		XRaiseWindow(dpy, m->sel->win);
1363	if (m->lt[m->sellt]->arrange) {
1364		wc.stack_mode = Below;
1365		wc.sibling = m->barwin;
1366		for (c = m->stack; c; c = c->snext)
1367			if (!c->isfloating && ISVISIBLE(c)) {
1368				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1369				wc.sibling = c->win;
1370			}
1371	}
1372	XSync(dpy, False);
1373	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1374}
1375
1376void
1377run(void)
1378{
1379	XEvent ev;
1380	/* main event loop */
1381	XSync(dpy, False);
1382	while (running && !XNextEvent(dpy, &ev))
1383		if (handler[ev.type])
1384			handler[ev.type](&ev); /* call handler */
1385}
1386
1387void
1388scan(void)
1389{
1390	unsigned int i, num;
1391	Window d1, d2, *wins = NULL;
1392	XWindowAttributes wa;
1393
1394	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1395		for (i = 0; i < num; i++) {
1396			if (!XGetWindowAttributes(dpy, wins[i], &wa)
1397			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1398				continue;
1399			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1400				manage(wins[i], &wa);
1401		}
1402		for (i = 0; i < num; i++) { /* now the transients */
1403			if (!XGetWindowAttributes(dpy, wins[i], &wa))
1404				continue;
1405			if (XGetTransientForHint(dpy, wins[i], &d1)
1406			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1407				manage(wins[i], &wa);
1408		}
1409		if (wins)
1410			XFree(wins);
1411	}
1412}
1413
1414void
1415sendmon(Client *c, Monitor *m)
1416{
1417	if (c->mon == m)
1418		return;
1419	unfocus(c, 1);
1420	detach(c);
1421	detachstack(c);
1422	c->mon = m;
1423	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1424	attach(c);
1425	attachstack(c);
1426	focus(NULL);
1427	arrange(NULL);
1428}
1429
1430void
1431setclientstate(Client *c, long state)
1432{
1433	long data[] = { state, None };
1434
1435	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1436	                PropModeReplace, (unsigned char *)data, 2);
1437}
1438
1439int
1440sendevent(Client *c, Atom proto)
1441{
1442	int n;
1443	Atom *protocols;
1444	int exists = 0;
1445	XEvent ev;
1446
1447	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1448		while (!exists && n--)
1449			exists = protocols[n] == proto;
1450		XFree(protocols);
1451	}
1452	if (exists) {
1453		ev.type = ClientMessage;
1454		ev.xclient.window = c->win;
1455		ev.xclient.message_type = wmatom[WMProtocols];
1456		ev.xclient.format = 32;
1457		ev.xclient.data.l[0] = proto;
1458		ev.xclient.data.l[1] = CurrentTime;
1459		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1460	}
1461	return exists;
1462}
1463
1464void
1465setfocus(Client *c)
1466{
1467	if (!c->neverfocus) {
1468		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1469		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1470		                XA_WINDOW, 32, PropModeReplace,
1471		                (unsigned char *) &(c->win), 1);
1472	}
1473	sendevent(c, wmatom[WMTakeFocus]);
1474}
1475
1476void
1477setfullscreen(Client *c, int fullscreen)
1478{
1479	if (fullscreen && !c->isfullscreen) {
1480		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1481		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1482		c->isfullscreen = 1;
1483		c->oldstate = c->isfloating;
1484		c->oldbw = c->bw;
1485		c->bw = 0;
1486		c->isfloating = 1;
1487		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1488		XRaiseWindow(dpy, c->win);
1489	} else if (!fullscreen && c->isfullscreen){
1490		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1491		                PropModeReplace, (unsigned char*)0, 0);
1492		c->isfullscreen = 0;
1493		c->isfloating = c->oldstate;
1494		c->bw = c->oldbw;
1495		c->x = c->oldx;
1496		c->y = c->oldy;
1497		c->w = c->oldw;
1498		c->h = c->oldh;
1499		resizeclient(c, c->x, c->y, c->w, c->h);
1500		arrange(c->mon);
1501	}
1502}
1503
1504void
1505setlayout(const Arg *arg)
1506{
1507	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1508		selmon->sellt ^= 1;
1509	if (arg && arg->v)
1510		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1511	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1512	if (selmon->sel)
1513		arrange(selmon);
1514	else
1515		drawbar(selmon);
1516}
1517
1518/* arg > 1.0 will set mfact absolutely */
1519void
1520setmfact(const Arg *arg)
1521{
1522	float f;
1523
1524	if (!arg || !selmon->lt[selmon->sellt]->arrange)
1525		return;
1526	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1527	if (f < 0.1 || f > 0.9)
1528		return;
1529	selmon->mfact = f;
1530	arrange(selmon);
1531}
1532
1533void
1534setup(void)
1535{
1536	int i;
1537	XSetWindowAttributes wa;
1538	Atom utf8string;
1539
1540	/* clean up any zombies immediately */
1541	sigchld(0);
1542
1543	/* init screen */
1544	screen = DefaultScreen(dpy);
1545	sw = DisplayWidth(dpy, screen);
1546	sh = DisplayHeight(dpy, screen);
1547	root = RootWindow(dpy, screen);
1548	drw = drw_create(dpy, screen, root, sw, sh);
1549	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1550		die("no fonts could be loaded.");
1551	lrpad = drw->fonts->h;
1552	bh = drw->fonts->h + 2;
1553	updategeom();
1554	/* init atoms */
1555	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1556	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1557	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1558	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1559	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1560	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1561	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1562	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1563	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1564	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1565	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1566	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1567	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1568	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1569	/* init cursors */
1570	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1571	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1572	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1573	/* init appearance */
1574	scheme = ecalloc(LENGTH(colors), sizeof(Scm));
1575	for (i = 0; i < LENGTH(colors); i++)
1576		scheme[i] = drw_scm_create(drw, colors[i], 3);
1577	/* init bars */
1578	updatebars();
1579	updatestatus();
1580	/* supporting window for NetWMCheck */
1581	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1582	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1583	                PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1584	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1585	                PropModeReplace, (unsigned char *) "dwm", 4);
1586	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1587	                PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1588	/* EWMH support per view */
1589	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1590	                PropModeReplace, (unsigned char *) netatom, NetLast);
1591	XDeleteProperty(dpy, root, netatom[NetClientList]);
1592	/* select events */
1593	wa.cursor = cursor[CurNormal]->cursor;
1594	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1595	                |ButtonPressMask|PointerMotionMask|EnterWindowMask
1596	                |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1597	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1598	XSelectInput(dpy, root, wa.event_mask);
1599	grabkeys();
1600	focus(NULL);
1601}
1602
1603
1604void
1605seturgent(Client *c, int urg)
1606{
1607	XWMHints *wmh;
1608
1609	c->isurgent = urg;
1610	if (!(wmh = XGetWMHints(dpy, c->win)))
1611		return;
1612	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1613	XSetWMHints(dpy, c->win, wmh);
1614	XFree(wmh);
1615}
1616
1617void
1618showhide(Client *c)
1619{
1620	if (!c)
1621		return;
1622	if (ISVISIBLE(c)) {
1623		/* show clients top down */
1624		XMoveWindow(dpy, c->win, c->x, c->y);
1625		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1626			resize(c, c->x, c->y, c->w, c->h, 0);
1627		showhide(c->snext);
1628	} else {
1629		/* hide clients bottom up */
1630		showhide(c->snext);
1631		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1632	}
1633}
1634
1635void
1636sigchld(int unused)
1637{
1638	if (signal(SIGCHLD, sigchld) == SIG_ERR)
1639		die("can't install SIGCHLD handler:");
1640	while (0 < waitpid(-1, NULL, WNOHANG));
1641}
1642
1643void
1644spawn(const Arg *arg)
1645{
1646	if (arg->v == dmenucmd)
1647		dmenumon[0] = '0' + selmon->num;
1648	if (fork() == 0) {
1649		if (dpy)
1650			close(ConnectionNumber(dpy));
1651		setsid();
1652		execvp(((char **)arg->v)[0], (char **)arg->v);
1653		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1654		perror(" failed");
1655		exit(EXIT_SUCCESS);
1656	}
1657}
1658
1659void
1660tag(const Arg *arg)
1661{
1662	if (selmon->sel && arg->ui & TAGMASK) {
1663		selmon->sel->tags = arg->ui & TAGMASK;
1664		focus(NULL);
1665		arrange(selmon);
1666	}
1667}
1668
1669void
1670tagmon(const Arg *arg)
1671{
1672	if (!selmon->sel || !mons->next)
1673		return;
1674	sendmon(selmon->sel, dirtomon(arg->i));
1675}
1676
1677void
1678tile(Monitor *m)
1679{
1680	unsigned int i, n, h, mw, my, ty;
1681	Client *c;
1682
1683	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1684	if (n == 0)
1685		return;
1686
1687	if (n > m->nmaster)
1688		mw = m->nmaster ? m->ww * m->mfact : 0;
1689	else
1690		mw = m->ww;
1691	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1692		if (i < m->nmaster) {
1693			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1694			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1695			my += HEIGHT(c);
1696		} else {
1697			h = (m->wh - ty) / (n - i);
1698			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1699			ty += HEIGHT(c);
1700		}
1701}
1702
1703void
1704togglebar(const Arg *arg)
1705{
1706	selmon->showbar = !selmon->showbar;
1707	updatebarpos(selmon);
1708	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1709	arrange(selmon);
1710}
1711
1712void
1713togglefloating(const Arg *arg)
1714{
1715	if (!selmon->sel)
1716		return;
1717	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1718		return;
1719	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1720	if (selmon->sel->isfloating)
1721		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1722		       selmon->sel->w, selmon->sel->h, 0);
1723	arrange(selmon);
1724}
1725
1726void
1727toggletag(const Arg *arg)
1728{
1729	unsigned int newtags;
1730
1731	if (!selmon->sel)
1732		return;
1733	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1734	if (newtags) {
1735		selmon->sel->tags = newtags;
1736		focus(NULL);
1737		arrange(selmon);
1738	}
1739}
1740
1741void
1742toggleview(const Arg *arg)
1743{
1744	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1745
1746	if (newtagset) {
1747		selmon->tagset[selmon->seltags] = newtagset;
1748		focus(NULL);
1749		arrange(selmon);
1750	}
1751}
1752
1753void
1754unfocus(Client *c, int setfocus)
1755{
1756	if (!c)
1757		return;
1758	grabbuttons(c, 0);
1759	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1760	if (setfocus) {
1761		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1762		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1763	}
1764}
1765
1766void
1767unmanage(Client *c, int destroyed)
1768{
1769	Monitor *m = c->mon;
1770	XWindowChanges wc;
1771
1772	detach(c);
1773	detachstack(c);
1774	if (!destroyed) {
1775		wc.border_width = c->oldbw;
1776		XGrabServer(dpy); /* avoid race conditions */
1777		XSetErrorHandler(xerrordummy);
1778		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1779		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1780		setclientstate(c, WithdrawnState);
1781		XSync(dpy, False);
1782		XSetErrorHandler(xerror);
1783		XUngrabServer(dpy);
1784	}
1785	free(c);
1786	focus(NULL);
1787	updateclientlist();
1788	arrange(m);
1789}
1790
1791void
1792unmapnotify(XEvent *e)
1793{
1794	Client *c;
1795	XUnmapEvent *ev = &e->xunmap;
1796
1797	if ((c = wintoclient(ev->window))) {
1798		if (ev->send_event)
1799			setclientstate(c, WithdrawnState);
1800		else
1801			unmanage(c, 0);
1802	}
1803}
1804
1805void
1806updatebars(void)
1807{
1808	Monitor *m;
1809	XSetWindowAttributes wa = {
1810		.override_redirect = True,
1811		.background_pixmap = ParentRelative,
1812		.event_mask = ButtonPressMask|ExposureMask
1813	};
1814	for (m = mons; m; m = m->next) {
1815		if (m->barwin)
1816			continue;
1817		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1818		                          CopyFromParent, DefaultVisual(dpy, screen),
1819		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1820		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1821		XMapRaised(dpy, m->barwin);
1822	}
1823}
1824
1825void
1826updatebarpos(Monitor *m)
1827{
1828	m->wy = m->my;
1829	m->wh = m->mh;
1830	if (m->showbar) {
1831		m->wh -= bh;
1832		m->by = m->topbar ? m->wy : m->wy + m->wh;
1833		m->wy = m->topbar ? m->wy + bh : m->wy;
1834	} else
1835		m->by = -bh;
1836}
1837
1838void
1839updateclientlist()
1840{
1841	Client *c;
1842	Monitor *m;
1843
1844	XDeleteProperty(dpy, root, netatom[NetClientList]);
1845	for (m = mons; m; m = m->next)
1846		for (c = m->clients; c; c = c->next)
1847			XChangeProperty(dpy, root, netatom[NetClientList],
1848			                XA_WINDOW, 32, PropModeAppend,
1849			                (unsigned char *) &(c->win), 1);
1850}
1851
1852int
1853updategeom(void)
1854{
1855	int dirty = 0;
1856
1857#ifdef XINERAMA
1858	if (XineramaIsActive(dpy)) {
1859		int i, j, n, nn;
1860		Client *c;
1861		Monitor *m;
1862		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1863		XineramaScreenInfo *unique = NULL;
1864
1865		for (n = 0, m = mons; m; m = m->next, n++);
1866		/* only consider unique geometries as separate screens */
1867		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1868		for (i = 0, j = 0; i < nn; i++)
1869			if (isuniquegeom(unique, j, &info[i]))
1870				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1871		XFree(info);
1872		nn = j;
1873		if (n <= nn) { /* new monitors available */
1874			for (i = 0; i < (nn - n); i++) {
1875				for (m = mons; m && m->next; m = m->next);
1876				if (m)
1877					m->next = createmon();
1878				else
1879					mons = createmon();
1880			}
1881			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1882				if (i >= n
1883				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
1884				|| unique[i].width != m->mw || unique[i].height != m->mh)
1885				{
1886					dirty = 1;
1887					m->num = i;
1888					m->mx = m->wx = unique[i].x_org;
1889					m->my = m->wy = unique[i].y_org;
1890					m->mw = m->ww = unique[i].width;
1891					m->mh = m->wh = unique[i].height;
1892					updatebarpos(m);
1893				}
1894		} else { /* less monitors available nn < n */
1895			for (i = nn; i < n; i++) {
1896				for (m = mons; m && m->next; m = m->next);
1897				while ((c = m->clients)) {
1898					dirty = 1;
1899					m->clients = c->next;
1900					detachstack(c);
1901					c->mon = mons;
1902					attach(c);
1903					attachstack(c);
1904				}
1905				if (m == selmon)
1906					selmon = mons;
1907				cleanupmon(m);
1908			}
1909		}
1910		free(unique);
1911	} else
1912#endif /* XINERAMA */
1913	{ /* default monitor setup */
1914		if (!mons)
1915			mons = createmon();
1916		if (mons->mw != sw || mons->mh != sh) {
1917			dirty = 1;
1918			mons->mw = mons->ww = sw;
1919			mons->mh = mons->wh = sh;
1920			updatebarpos(mons);
1921		}
1922	}
1923	if (dirty) {
1924		selmon = mons;
1925		selmon = wintomon(root);
1926	}
1927	return dirty;
1928}
1929
1930void
1931updatenumlockmask(void)
1932{
1933	unsigned int i, j;
1934	XModifierKeymap *modmap;
1935
1936	numlockmask = 0;
1937	modmap = XGetModifierMapping(dpy);
1938	for (i = 0; i < 8; i++)
1939		for (j = 0; j < modmap->max_keypermod; j++)
1940			if (modmap->modifiermap[i * modmap->max_keypermod + j]
1941			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1942				numlockmask = (1 << i);
1943	XFreeModifiermap(modmap);
1944}
1945
1946void
1947updatesizehints(Client *c)
1948{
1949	long msize;
1950	XSizeHints size;
1951
1952	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1953		/* size is uninitialized, ensure that size.flags aren't used */
1954		size.flags = PSize;
1955	if (size.flags & PBaseSize) {
1956		c->basew = size.base_width;
1957		c->baseh = size.base_height;
1958	} else if (size.flags & PMinSize) {
1959		c->basew = size.min_width;
1960		c->baseh = size.min_height;
1961	} else
1962		c->basew = c->baseh = 0;
1963	if (size.flags & PResizeInc) {
1964		c->incw = size.width_inc;
1965		c->inch = size.height_inc;
1966	} else
1967		c->incw = c->inch = 0;
1968	if (size.flags & PMaxSize) {
1969		c->maxw = size.max_width;
1970		c->maxh = size.max_height;
1971	} else
1972		c->maxw = c->maxh = 0;
1973	if (size.flags & PMinSize) {
1974		c->minw = size.min_width;
1975		c->minh = size.min_height;
1976	} else if (size.flags & PBaseSize) {
1977		c->minw = size.base_width;
1978		c->minh = size.base_height;
1979	} else
1980		c->minw = c->minh = 0;
1981	if (size.flags & PAspect) {
1982		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1983		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1984	} else
1985		c->maxa = c->mina = 0.0;
1986	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1987	              && c->maxw == c->minw && c->maxh == c->minh);
1988}
1989
1990void
1991updatetitle(Client *c)
1992{
1993	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1994		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1995	if (c->name[0] == '\0') /* hack to mark broken clients */
1996		strcpy(c->name, broken);
1997}
1998
1999void
2000updatestatus(void)
2001{
2002	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2003		strcpy(stext, "dwm-"VERSION);
2004	drawbar(selmon);
2005}
2006
2007void
2008updatewindowtype(Client *c)
2009{
2010	Atom state = getatomprop(c, netatom[NetWMState]);
2011	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2012
2013	if (state == netatom[NetWMFullscreen])
2014		setfullscreen(c, 1);
2015	if (wtype == netatom[NetWMWindowTypeDialog])
2016		c->isfloating = 1;
2017}
2018
2019void
2020updatewmhints(Client *c)
2021{
2022	XWMHints *wmh;
2023
2024	if ((wmh = XGetWMHints(dpy, c->win))) {
2025		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2026			wmh->flags &= ~XUrgencyHint;
2027			XSetWMHints(dpy, c->win, wmh);
2028		} else
2029			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2030		if (wmh->flags & InputHint)
2031			c->neverfocus = !wmh->input;
2032		else
2033			c->neverfocus = 0;
2034		XFree(wmh);
2035	}
2036}
2037
2038void
2039view(const Arg *arg)
2040{
2041	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2042		return;
2043	selmon->seltags ^= 1; /* toggle sel tagset */
2044	if (arg->ui & TAGMASK)
2045		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2046	focus(NULL);
2047	arrange(selmon);
2048}
2049
2050Client *
2051wintoclient(Window w)
2052{
2053	Client *c;
2054	Monitor *m;
2055
2056	for (m = mons; m; m = m->next)
2057		for (c = m->clients; c; c = c->next)
2058			if (c->win == w)
2059				return c;
2060	return NULL;
2061}
2062
2063Monitor *
2064wintomon(Window w)
2065{
2066	int x, y;
2067	Client *c;
2068	Monitor *m;
2069
2070	if (w == root && getrootptr(&x, &y))
2071		return recttomon(x, y, 1, 1);
2072	for (m = mons; m; m = m->next)
2073		if (w == m->barwin)
2074			return m;
2075	if ((c = wintoclient(w)))
2076		return c->mon;
2077	return selmon;
2078}
2079
2080/* There's no way to check accesses to destroyed windows, thus those cases are
2081 * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2082 * default error handler, which may call exit. */
2083int
2084xerror(Display *dpy, XErrorEvent *ee)
2085{
2086	if (ee->error_code == BadWindow
2087	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2088	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2089	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2090	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2091	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2092	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2093	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2094	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2095		return 0;
2096	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2097	        ee->request_code, ee->error_code);
2098	return xerrorxlib(dpy, ee); /* may call exit */
2099}
2100
2101int
2102xerrordummy(Display *dpy, XErrorEvent *ee)
2103{
2104	return 0;
2105}
2106
2107/* Startup Error handler to check if another window manager
2108 * is already running. */
2109int
2110xerrorstart(Display *dpy, XErrorEvent *ee)
2111{
2112	die("dwm: another window manager is already running");
2113	return -1;
2114}
2115
2116void
2117zoom(const Arg *arg)
2118{
2119	Client *c = selmon->sel;
2120
2121	if (!selmon->lt[selmon->sellt]->arrange
2122	|| (selmon->sel && selmon->sel->isfloating))
2123		return;
2124	if (c == nexttiled(selmon->clients))
2125		if (!c || !(c = nexttiled(c->next)))
2126			return;
2127	pop(c);
2128}
2129
2130int
2131main(int argc, char *argv[])
2132{
2133	if (argc == 2 && !strcmp("-v", argv[1]))
2134		die("dwm-"VERSION);
2135	else if (argc != 1)
2136		die("usage: dwm [-v]");
2137	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2138		fputs("warning: no locale support\n", stderr);
2139	if (!(dpy = XOpenDisplay(NULL)))
2140		die("dwm: cannot open display");
2141	checkotherwm();
2142	setup();
2143	scan();
2144	run();
2145	cleanup();
2146	XCloseDisplay(dpy);
2147	return EXIT_SUCCESS;
2148}