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 clearurgent(Client *c);
 157static void clientmessage(XEvent *e);
 158static void configure(Client *c);
 159static void configurenotify(XEvent *e);
 160static void configurerequest(XEvent *e);
 161static Monitor *createmon(void);
 162static void destroynotify(XEvent *e);
 163static void detach(Client *c);
 164static void detachstack(Client *c);
 165static Monitor *dirtomon(int dir);
 166static void drawbar(Monitor *m);
 167static void drawbars(void);
 168static void enternotify(XEvent *e);
 169static void expose(XEvent *e);
 170static void focus(Client *c);
 171static void focusin(XEvent *e);
 172static void focusmon(const Arg *arg);
 173static void focusstack(const Arg *arg);
 174static int getrootptr(int *x, int *y);
 175static long getstate(Window w);
 176static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 177static void grabbuttons(Client *c, int focused);
 178static void grabkeys(void);
 179static void incnmaster(const Arg *arg);
 180static void keypress(XEvent *e);
 181static void killclient(const Arg *arg);
 182static void manage(Window w, XWindowAttributes *wa);
 183static void mappingnotify(XEvent *e);
 184static void maprequest(XEvent *e);
 185static void monocle(Monitor *m);
 186static void motionnotify(XEvent *e);
 187static void movemouse(const Arg *arg);
 188static Client *nexttiled(Client *c);
 189static void pop(Client *);
 190static void propertynotify(XEvent *e);
 191static void quit(const Arg *arg);
 192static Monitor *recttomon(int x, int y, int w, int h);
 193static void resize(Client *c, int x, int y, int w, int h, int interact);
 194static void resizeclient(Client *c, int x, int y, int w, int h);
 195static void resizemouse(const Arg *arg);
 196static void restack(Monitor *m);
 197static void run(void);
 198static void scan(void);
 199static int sendevent(Client *c, Atom proto);
 200static void sendmon(Client *c, Monitor *m);
 201static void setclientstate(Client *c, long state);
 202static void setfocus(Client *c);
 203static void setfullscreen(Client *c, int fullscreen);
 204static void setlayout(const Arg *arg);
 205static void setmfact(const Arg *arg);
 206static void setup(void);
 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
 512clearurgent(Client *c)
 513{
 514	XWMHints *wmh;
 515
 516	c->isurgent = 0;
 517	if (!(wmh = XGetWMHints(dpy, c->win)))
 518		return;
 519	wmh->flags &= ~XUrgencyHint;
 520	XSetWMHints(dpy, c->win, wmh);
 521	XFree(wmh);
 522}
 523
 524void
 525clientmessage(XEvent *e)
 526{
 527	XClientMessageEvent *cme = &e->xclient;
 528	Client *c = wintoclient(cme->window);
 529
 530	if (!c)
 531		return;
 532	if (cme->message_type == netatom[NetWMState]) {
 533		if (cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 534			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 535			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 536	} else if (cme->message_type == netatom[NetActiveWindow]) {
 537		if (!ISVISIBLE(c)) {
 538			c->mon->seltags ^= 1;
 539			c->mon->tagset[c->mon->seltags] = c->tags;
 540		}
 541		pop(c);
 542	}
 543}
 544
 545void
 546configure(Client *c)
 547{
 548	XConfigureEvent ce;
 549
 550	ce.type = ConfigureNotify;
 551	ce.display = dpy;
 552	ce.event = c->win;
 553	ce.window = c->win;
 554	ce.x = c->x;
 555	ce.y = c->y;
 556	ce.width = c->w;
 557	ce.height = c->h;
 558	ce.border_width = c->bw;
 559	ce.above = None;
 560	ce.override_redirect = False;
 561	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 562}
 563
 564void
 565configurenotify(XEvent *e)
 566{
 567	Monitor *m;
 568	Client *c;
 569	XConfigureEvent *ev = &e->xconfigure;
 570	int dirty;
 571
 572	/* TODO: updategeom handling sucks, needs to be simplified */
 573	if (ev->window == root) {
 574		dirty = (sw != ev->width || sh != ev->height);
 575		sw = ev->width;
 576		sh = ev->height;
 577		if (updategeom() || dirty) {
 578			drw_resize(drw, sw, bh);
 579			updatebars();
 580			for (m = mons; m; m = m->next) {
 581				for (c = m->clients; c; c = c->next)
 582					if (c->isfullscreen)
 583						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 584				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 585			}
 586			focus(NULL);
 587			arrange(NULL);
 588		}
 589	}
 590}
 591
 592void
 593configurerequest(XEvent *e)
 594{
 595	Client *c;
 596	Monitor *m;
 597	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 598	XWindowChanges wc;
 599
 600	if ((c = wintoclient(ev->window))) {
 601		if (ev->value_mask & CWBorderWidth)
 602			c->bw = ev->border_width;
 603		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 604			m = c->mon;
 605			if (ev->value_mask & CWX) {
 606				c->oldx = c->x;
 607				c->x = m->mx + ev->x;
 608			}
 609			if (ev->value_mask & CWY) {
 610				c->oldy = c->y;
 611				c->y = m->my + ev->y;
 612			}
 613			if (ev->value_mask & CWWidth) {
 614				c->oldw = c->w;
 615				c->w = ev->width;
 616			}
 617			if (ev->value_mask & CWHeight) {
 618				c->oldh = c->h;
 619				c->h = ev->height;
 620			}
 621			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 622				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 623			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 624				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 625			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 626				configure(c);
 627			if (ISVISIBLE(c))
 628				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 629		} else
 630			configure(c);
 631	} else {
 632		wc.x = ev->x;
 633		wc.y = ev->y;
 634		wc.width = ev->width;
 635		wc.height = ev->height;
 636		wc.border_width = ev->border_width;
 637		wc.sibling = ev->above;
 638		wc.stack_mode = ev->detail;
 639		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 640	}
 641	XSync(dpy, False);
 642}
 643
 644Monitor *
 645createmon(void)
 646{
 647	Monitor *m;
 648
 649	m = ecalloc(1, sizeof(Monitor));
 650	m->tagset[0] = m->tagset[1] = 1;
 651	m->mfact = mfact;
 652	m->nmaster = nmaster;
 653	m->showbar = showbar;
 654	m->topbar = topbar;
 655	m->lt[0] = &layouts[0];
 656	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 657	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 658	return m;
 659}
 660
 661void
 662destroynotify(XEvent *e)
 663{
 664	Client *c;
 665	XDestroyWindowEvent *ev = &e->xdestroywindow;
 666
 667	if ((c = wintoclient(ev->window)))
 668		unmanage(c, 1);
 669}
 670
 671void
 672detach(Client *c)
 673{
 674	Client **tc;
 675
 676	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 677	*tc = c->next;
 678}
 679
 680void
 681detachstack(Client *c)
 682{
 683	Client **tc, *t;
 684
 685	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 686	*tc = c->snext;
 687
 688	if (c == c->mon->sel) {
 689		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 690		c->mon->sel = t;
 691	}
 692}
 693
 694Monitor *
 695dirtomon(int dir)
 696{
 697	Monitor *m = NULL;
 698
 699	if (dir > 0) {
 700		if (!(m = selmon->next))
 701			m = mons;
 702	} else if (selmon == mons)
 703		for (m = mons; m->next; m = m->next);
 704	else
 705		for (m = mons; m->next != selmon; m = m->next);
 706	return m;
 707}
 708
 709void
 710drawbar(Monitor *m)
 711{
 712	int x, w, sw = 0;
 713	int boxs = drw->fonts->h / 9;
 714	int boxw = drw->fonts->h / 6 + 2;
 715	unsigned int i, occ = 0, urg = 0;
 716	Client *c;
 717
 718	/* draw status first so it can be overdrawn by tags later */
 719	if (m == selmon) { /* status is only drawn on selected monitor */
 720		drw_setscheme(drw, scheme[SchemeNorm]);
 721		sw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 722		drw_text(drw, m->ww - sw, 0, sw, bh, 0, stext, 0);
 723	}
 724
 725	for (c = m->clients; c; c = c->next) {
 726		occ |= c->tags;
 727		if (c->isurgent)
 728			urg |= c->tags;
 729	}
 730	x = 0;
 731	for (i = 0; i < LENGTH(tags); i++) {
 732		w = TEXTW(tags[i]);
 733		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 734		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 735		if (occ & 1 << i)
 736			drw_rect(drw, x + boxs, boxs, boxw, boxw,
 737			         m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 738			         urg & 1 << i);
 739		x += w;
 740	}
 741	w = blw = TEXTW(m->ltsymbol);
 742	drw_setscheme(drw, scheme[SchemeNorm]);
 743	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 744
 745	if ((w = m->ww - sw - x) > bh) {
 746		if (m->sel) {
 747			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 748			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 749			if (m->sel->isfloating)
 750				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 751		} else {
 752			drw_setscheme(drw, scheme[SchemeNorm]);
 753			drw_rect(drw, x, 0, w, bh, 1, 1);
 754		}
 755	}
 756	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 757}
 758
 759void
 760drawbars(void)
 761{
 762	Monitor *m;
 763
 764	for (m = mons; m; m = m->next)
 765		drawbar(m);
 766}
 767
 768void
 769enternotify(XEvent *e)
 770{
 771	Client *c;
 772	Monitor *m;
 773	XCrossingEvent *ev = &e->xcrossing;
 774
 775	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 776		return;
 777	c = wintoclient(ev->window);
 778	m = c ? c->mon : wintomon(ev->window);
 779	if (m != selmon) {
 780		unfocus(selmon->sel, 1);
 781		selmon = m;
 782	} else if (!c || c == selmon->sel)
 783		return;
 784	focus(c);
 785}
 786
 787void
 788expose(XEvent *e)
 789{
 790	Monitor *m;
 791	XExposeEvent *ev = &e->xexpose;
 792
 793	if (ev->count == 0 && (m = wintomon(ev->window)))
 794		drawbar(m);
 795}
 796
 797void
 798focus(Client *c)
 799{
 800	if (!c || !ISVISIBLE(c))
 801		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 802	/* was if (selmon->sel) */
 803	if (selmon->sel && selmon->sel != c)
 804		unfocus(selmon->sel, 0);
 805	if (c) {
 806		if (c->mon != selmon)
 807			selmon = c->mon;
 808		if (c->isurgent)
 809			clearurgent(c);
 810		detachstack(c);
 811		attachstack(c);
 812		grabbuttons(c, 1);
 813		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 814		setfocus(c);
 815	} else {
 816		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 817		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 818	}
 819	selmon->sel = c;
 820	drawbars();
 821}
 822
 823/* there are some broken focus acquiring clients */
 824void
 825focusin(XEvent *e)
 826{
 827	XFocusChangeEvent *ev = &e->xfocus;
 828
 829	if (selmon->sel && ev->window != selmon->sel->win)
 830		setfocus(selmon->sel);
 831}
 832
 833void
 834focusmon(const Arg *arg)
 835{
 836	Monitor *m;
 837
 838	if (!mons->next)
 839		return;
 840	if ((m = dirtomon(arg->i)) == selmon)
 841		return;
 842	unfocus(selmon->sel, 0); /* s/1/0/ fixes input focus issues
 843					in gedit and anjuta */
 844	selmon = m;
 845	focus(NULL);
 846}
 847
 848void
 849focusstack(const Arg *arg)
 850{
 851	Client *c = NULL, *i;
 852
 853	if (!selmon->sel)
 854		return;
 855	if (arg->i > 0) {
 856		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 857		if (!c)
 858			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 859	} else {
 860		for (i = selmon->clients; i != selmon->sel; i = i->next)
 861			if (ISVISIBLE(i))
 862				c = i;
 863		if (!c)
 864			for (; i; i = i->next)
 865				if (ISVISIBLE(i))
 866					c = i;
 867	}
 868	if (c) {
 869		focus(c);
 870		restack(selmon);
 871	}
 872}
 873
 874Atom
 875getatomprop(Client *c, Atom prop)
 876{
 877	int di;
 878	unsigned long dl;
 879	unsigned char *p = NULL;
 880	Atom da, atom = None;
 881
 882	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 883	                      &da, &di, &dl, &dl, &p) == Success && p) {
 884		atom = *(Atom *)p;
 885		XFree(p);
 886	}
 887	return atom;
 888}
 889
 890int
 891getrootptr(int *x, int *y)
 892{
 893	int di;
 894	unsigned int dui;
 895	Window dummy;
 896
 897	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 898}
 899
 900long
 901getstate(Window w)
 902{
 903	int format;
 904	long result = -1;
 905	unsigned char *p = NULL;
 906	unsigned long n, extra;
 907	Atom real;
 908
 909	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 910	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 911		return -1;
 912	if (n != 0)
 913		result = *p;
 914	XFree(p);
 915	return result;
 916}
 917
 918int
 919gettextprop(Window w, Atom atom, char *text, unsigned int size)
 920{
 921	char **list = NULL;
 922	int n;
 923	XTextProperty name;
 924
 925	if (!text || size == 0)
 926		return 0;
 927	text[0] = '\0';
 928	XGetTextProperty(dpy, w, &name, atom);
 929	if (!name.nitems)
 930		return 0;
 931	if (name.encoding == XA_STRING)
 932		strncpy(text, (char *)name.value, size - 1);
 933	else {
 934		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 935			strncpy(text, *list, size - 1);
 936			XFreeStringList(list);
 937		}
 938	}
 939	text[size - 1] = '\0';
 940	XFree(name.value);
 941	return 1;
 942}
 943
 944void
 945grabbuttons(Client *c, int focused)
 946{
 947	updatenumlockmask();
 948	{
 949		unsigned int i, j;
 950		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 951		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 952		if (focused) {
 953			for (i = 0; i < LENGTH(buttons); i++)
 954				if (buttons[i].click == ClkClientWin)
 955					for (j = 0; j < LENGTH(modifiers); j++)
 956						XGrabButton(dpy, buttons[i].button,
 957						            buttons[i].mask | modifiers[j],
 958						            c->win, False, BUTTONMASK,
 959						            GrabModeAsync, GrabModeSync, None, None);
 960		} else
 961			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 962			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 963	}
 964}
 965
 966void
 967grabkeys(void)
 968{
 969	updatenumlockmask();
 970	{
 971		unsigned int i, j;
 972		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 973		KeyCode code;
 974
 975		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 976		for (i = 0; i < LENGTH(keys); i++)
 977			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 978				for (j = 0; j < LENGTH(modifiers); j++)
 979					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 980						 True, GrabModeAsync, GrabModeAsync);
 981	}
 982}
 983
 984void
 985incnmaster(const Arg *arg)
 986{
 987	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 988	arrange(selmon);
 989}
 990
 991#ifdef XINERAMA
 992static int
 993isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 994{
 995	while (n--)
 996		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 997		&& unique[n].width == info->width && unique[n].height == info->height)
 998			return 0;
 999	return 1;
1000}
1001#endif /* XINERAMA */
1002
1003void
1004keypress(XEvent *e)
1005{
1006	unsigned int i;
1007	KeySym keysym;
1008	XKeyEvent *ev;
1009
1010	ev = &e->xkey;
1011	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1012	for (i = 0; i < LENGTH(keys); i++)
1013		if (keysym == keys[i].keysym
1014		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1015		&& keys[i].func)
1016			keys[i].func(&(keys[i].arg));
1017}
1018
1019void
1020killclient(const Arg *arg)
1021{
1022	if (!selmon->sel)
1023		return;
1024	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1025		XGrabServer(dpy);
1026		XSetErrorHandler(xerrordummy);
1027		XSetCloseDownMode(dpy, DestroyAll);
1028		XKillClient(dpy, selmon->sel->win);
1029		XSync(dpy, False);
1030		XSetErrorHandler(xerror);
1031		XUngrabServer(dpy);
1032	}
1033}
1034
1035void
1036manage(Window w, XWindowAttributes *wa)
1037{
1038	Client *c, *t = NULL;
1039	Window trans = None;
1040	XWindowChanges wc;
1041
1042	c = ecalloc(1, sizeof(Client));
1043	c->win = w;
1044	/* geometry */
1045	c->x = c->oldx = wa->x;
1046	c->y = c->oldy = wa->y;
1047	c->w = c->oldw = wa->width;
1048	c->h = c->oldh = wa->height;
1049	c->oldbw = wa->border_width;
1050
1051	updatetitle(c);
1052	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1053		c->mon = t->mon;
1054		c->tags = t->tags;
1055	} else {
1056		c->mon = selmon;
1057		applyrules(c);
1058	}
1059
1060	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1061		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1062	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1063		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1064	c->x = MAX(c->x, c->mon->mx);
1065	/* only fix client y-offset, if the client center might cover the bar */
1066	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1067	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1068	c->bw = borderpx;
1069
1070	wc.border_width = c->bw;
1071	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1072	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1073	configure(c); /* propagates border_width, if size doesn't change */
1074	updatewindowtype(c);
1075	updatesizehints(c);
1076	updatewmhints(c);
1077	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1078	grabbuttons(c, 0);
1079	if (!c->isfloating)
1080		c->isfloating = c->oldstate = trans != None || c->isfixed;
1081	if (c->isfloating)
1082		XRaiseWindow(dpy, c->win);
1083	attach(c);
1084	attachstack(c);
1085	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1086	                (unsigned char *) &(c->win), 1);
1087	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1088	setclientstate(c, NormalState);
1089	if (c->mon == selmon)
1090		unfocus(selmon->sel, 0);
1091	c->mon->sel = c;
1092	arrange(c->mon);
1093	XMapWindow(dpy, c->win);
1094	focus(NULL);
1095}
1096
1097void
1098mappingnotify(XEvent *e)
1099{
1100	XMappingEvent *ev = &e->xmapping;
1101
1102	XRefreshKeyboardMapping(ev);
1103	if (ev->request == MappingKeyboard)
1104		grabkeys();
1105}
1106
1107void
1108maprequest(XEvent *e)
1109{
1110	static XWindowAttributes wa;
1111	XMapRequestEvent *ev = &e->xmaprequest;
1112
1113	if (!XGetWindowAttributes(dpy, ev->window, &wa))
1114		return;
1115	if (wa.override_redirect)
1116		return;
1117	if (!wintoclient(ev->window))
1118		manage(ev->window, &wa);
1119}
1120
1121void
1122monocle(Monitor *m)
1123{
1124	unsigned int n = 0;
1125	Client *c;
1126
1127	for (c = m->clients; c; c = c->next)
1128		if (ISVISIBLE(c))
1129			n++;
1130	if (n > 0) /* override layout symbol */
1131		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1132	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1133		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1134}
1135
1136void
1137motionnotify(XEvent *e)
1138{
1139	static Monitor *mon = NULL;
1140	Monitor *m;
1141	XMotionEvent *ev = &e->xmotion;
1142
1143	if (ev->window != root)
1144		return;
1145	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1146		unfocus(selmon->sel, 1);
1147		selmon = m;
1148		focus(NULL);
1149	}
1150	mon = m;
1151}
1152
1153void
1154movemouse(const Arg *arg)
1155{
1156	int x, y, ocx, ocy, nx, ny;
1157	Client *c;
1158	Monitor *m;
1159	XEvent ev;
1160	Time lasttime = 0;
1161
1162	if (!(c = selmon->sel))
1163		return;
1164	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1165		return;
1166	restack(selmon);
1167	ocx = c->x;
1168	ocy = c->y;
1169	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1170	None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1171		return;
1172	if (!getrootptr(&x, &y))
1173		return;
1174	do {
1175		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1176		switch(ev.type) {
1177		case ConfigureRequest:
1178		case Expose:
1179		case MapRequest:
1180			handler[ev.type](&ev);
1181			break;
1182		case MotionNotify:
1183			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1184				continue;
1185			lasttime = ev.xmotion.time;
1186
1187			nx = ocx + (ev.xmotion.x - x);
1188			ny = ocy + (ev.xmotion.y - y);
1189			if (nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1190			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1191				if (abs(selmon->wx - nx) < snap)
1192					nx = selmon->wx;
1193				else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1194					nx = selmon->wx + selmon->ww - WIDTH(c);
1195				if (abs(selmon->wy - ny) < snap)
1196					ny = selmon->wy;
1197				else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1198					ny = selmon->wy + selmon->wh - HEIGHT(c);
1199				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1200				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1201					togglefloating(NULL);
1202			}
1203			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1204				resize(c, nx, ny, c->w, c->h, 1);
1205			break;
1206		}
1207	} while (ev.type != ButtonRelease);
1208	XUngrabPointer(dpy, CurrentTime);
1209	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1210		sendmon(c, m);
1211		selmon = m;
1212		focus(NULL);
1213	}
1214}
1215
1216Client *
1217nexttiled(Client *c)
1218{
1219	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1220	return c;
1221}
1222
1223void
1224pop(Client *c)
1225{
1226	detach(c);
1227	attach(c);
1228	focus(c);
1229	arrange(c->mon);
1230}
1231
1232void
1233propertynotify(XEvent *e)
1234{
1235	Client *c;
1236	Window trans;
1237	XPropertyEvent *ev = &e->xproperty;
1238
1239	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1240		updatestatus();
1241	else if (ev->state == PropertyDelete)
1242		return; /* ignore */
1243	else if ((c = wintoclient(ev->window))) {
1244		switch(ev->atom) {
1245		default: break;
1246		case XA_WM_TRANSIENT_FOR:
1247			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1248			   (c->isfloating = (wintoclient(trans)) != NULL))
1249				arrange(c->mon);
1250			break;
1251		case XA_WM_NORMAL_HINTS:
1252			updatesizehints(c);
1253			break;
1254		case XA_WM_HINTS:
1255			updatewmhints(c);
1256			drawbars();
1257			break;
1258		}
1259		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1260			updatetitle(c);
1261			if (c == c->mon->sel)
1262				drawbar(c->mon);
1263		}
1264		if (ev->atom == netatom[NetWMWindowType])
1265			updatewindowtype(c);
1266	}
1267}
1268
1269void
1270quit(const Arg *arg)
1271{
1272	running = 0;
1273}
1274
1275Monitor *
1276recttomon(int x, int y, int w, int h)
1277{
1278	Monitor *m, *r = selmon;
1279	int a, area = 0;
1280
1281	for (m = mons; m; m = m->next)
1282		if ((a = INTERSECT(x, y, w, h, m)) > area) {
1283			area = a;
1284			r = m;
1285		}
1286	return r;
1287}
1288
1289void
1290resize(Client *c, int x, int y, int w, int h, int interact)
1291{
1292	if (applysizehints(c, &x, &y, &w, &h, interact))
1293		resizeclient(c, x, y, w, h);
1294}
1295
1296void
1297resizeclient(Client *c, int x, int y, int w, int h)
1298{
1299	XWindowChanges wc;
1300
1301	c->oldx = c->x; c->x = wc.x = x;
1302	c->oldy = c->y; c->y = wc.y = y;
1303	c->oldw = c->w; c->w = wc.width = w;
1304	c->oldh = c->h; c->h = wc.height = h;
1305	wc.border_width = c->bw;
1306	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1307	configure(c);
1308	XSync(dpy, False);
1309}
1310
1311void
1312resizemouse(const Arg *arg)
1313{
1314	int ocx, ocy, nw, nh;
1315	Client *c;
1316	Monitor *m;
1317	XEvent ev;
1318	Time lasttime = 0;
1319
1320	if (!(c = selmon->sel))
1321		return;
1322	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1323		return;
1324	restack(selmon);
1325	ocx = c->x;
1326	ocy = c->y;
1327	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1328	                None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1329		return;
1330	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1331	do {
1332		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1333		switch(ev.type) {
1334		case ConfigureRequest:
1335		case Expose:
1336		case MapRequest:
1337			handler[ev.type](&ev);
1338			break;
1339		case MotionNotify:
1340			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1341				continue;
1342			lasttime = ev.xmotion.time;
1343
1344			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1345			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1346			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1347			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1348			{
1349				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1350				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1351					togglefloating(NULL);
1352			}
1353			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1354				resize(c, c->x, c->y, nw, nh, 1);
1355			break;
1356		}
1357	} while (ev.type != ButtonRelease);
1358	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1359	XUngrabPointer(dpy, CurrentTime);
1360	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1361	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1362		sendmon(c, m);
1363		selmon = m;
1364		focus(NULL);
1365	}
1366}
1367
1368void
1369restack(Monitor *m)
1370{
1371	Client *c;
1372	XEvent ev;
1373	XWindowChanges wc;
1374
1375	drawbar(m);
1376	if (!m->sel)
1377		return;
1378	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1379		XRaiseWindow(dpy, m->sel->win);
1380	if (m->lt[m->sellt]->arrange) {
1381		wc.stack_mode = Below;
1382		wc.sibling = m->barwin;
1383		for (c = m->stack; c; c = c->snext)
1384			if (!c->isfloating && ISVISIBLE(c)) {
1385				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1386				wc.sibling = c->win;
1387			}
1388	}
1389	XSync(dpy, False);
1390	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1391}
1392
1393void
1394run(void)
1395{
1396	XEvent ev;
1397	/* main event loop */
1398	XSync(dpy, False);
1399	while (running && !XNextEvent(dpy, &ev))
1400		if (handler[ev.type])
1401			handler[ev.type](&ev); /* call handler */
1402}
1403
1404void
1405scan(void)
1406{
1407	unsigned int i, num;
1408	Window d1, d2, *wins = NULL;
1409	XWindowAttributes wa;
1410
1411	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1412		for (i = 0; i < num; i++) {
1413			if (!XGetWindowAttributes(dpy, wins[i], &wa)
1414			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1415				continue;
1416			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1417				manage(wins[i], &wa);
1418		}
1419		for (i = 0; i < num; i++) { /* now the transients */
1420			if (!XGetWindowAttributes(dpy, wins[i], &wa))
1421				continue;
1422			if (XGetTransientForHint(dpy, wins[i], &d1)
1423			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1424				manage(wins[i], &wa);
1425		}
1426		if (wins)
1427			XFree(wins);
1428	}
1429}
1430
1431void
1432sendmon(Client *c, Monitor *m)
1433{
1434	if (c->mon == m)
1435		return;
1436	unfocus(c, 1);
1437	detach(c);
1438	detachstack(c);
1439	c->mon = m;
1440	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1441	attach(c);
1442	attachstack(c);
1443	focus(NULL);
1444	arrange(NULL);
1445}
1446
1447void
1448setclientstate(Client *c, long state)
1449{
1450	long data[] = { state, None };
1451
1452	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1453			PropModeReplace, (unsigned char *)data, 2);
1454}
1455
1456int
1457sendevent(Client *c, Atom proto)
1458{
1459	int n;
1460	Atom *protocols;
1461	int exists = 0;
1462	XEvent ev;
1463
1464	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1465		while (!exists && n--)
1466			exists = protocols[n] == proto;
1467		XFree(protocols);
1468	}
1469	if (exists) {
1470		ev.type = ClientMessage;
1471		ev.xclient.window = c->win;
1472		ev.xclient.message_type = wmatom[WMProtocols];
1473		ev.xclient.format = 32;
1474		ev.xclient.data.l[0] = proto;
1475		ev.xclient.data.l[1] = CurrentTime;
1476		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1477	}
1478	return exists;
1479}
1480
1481void
1482setfocus(Client *c)
1483{
1484	if (!c->neverfocus) {
1485		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1486		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1487		                XA_WINDOW, 32, PropModeReplace,
1488		                (unsigned char *) &(c->win), 1);
1489	}
1490	sendevent(c, wmatom[WMTakeFocus]);
1491}
1492
1493void
1494setfullscreen(Client *c, int fullscreen)
1495{
1496	if (fullscreen && !c->isfullscreen) {
1497		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1498		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1499		c->isfullscreen = 1;
1500		c->oldstate = c->isfloating;
1501		c->oldbw = c->bw;
1502		c->bw = 0;
1503		c->isfloating = 1;
1504		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1505		XRaiseWindow(dpy, c->win);
1506	} else if (!fullscreen && c->isfullscreen){
1507		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1508		                PropModeReplace, (unsigned char*)0, 0);
1509		c->isfullscreen = 0;
1510		c->isfloating = c->oldstate;
1511		c->bw = c->oldbw;
1512		c->x = c->oldx;
1513		c->y = c->oldy;
1514		c->w = c->oldw;
1515		c->h = c->oldh;
1516		resizeclient(c, c->x, c->y, c->w, c->h);
1517		arrange(c->mon);
1518	}
1519}
1520
1521void
1522setlayout(const Arg *arg)
1523{
1524	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1525		selmon->sellt ^= 1;
1526	if (arg && arg->v)
1527		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1528	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1529	if (selmon->sel)
1530		arrange(selmon);
1531	else
1532		drawbar(selmon);
1533}
1534
1535/* arg > 1.0 will set mfact absolutly */
1536void
1537setmfact(const Arg *arg)
1538{
1539	float f;
1540
1541	if (!arg || !selmon->lt[selmon->sellt]->arrange)
1542		return;
1543	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1544	if (f < 0.1 || f > 0.9)
1545		return;
1546	selmon->mfact = f;
1547	arrange(selmon);
1548}
1549
1550void
1551setup(void)
1552{
1553	int i;
1554	XSetWindowAttributes wa;
1555	Atom utf8string;
1556
1557	/* clean up any zombies immediately */
1558	sigchld(0);
1559
1560	/* init screen */
1561	screen = DefaultScreen(dpy);
1562	sw = DisplayWidth(dpy, screen);
1563	sh = DisplayHeight(dpy, screen);
1564	root = RootWindow(dpy, screen);
1565	drw = drw_create(dpy, screen, root, sw, sh);
1566	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1567		die("no fonts could be loaded.");
1568	lrpad = drw->fonts->h;
1569	bh = drw->fonts->h + 2;
1570	updategeom();
1571	/* init atoms */
1572	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1573	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1574	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1575	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1576	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1577	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1578	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1579	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1580	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1581	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1582	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1583	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1584	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1585	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1586	/* init cursors */
1587	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1588	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1589	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1590	/* init appearance */
1591	scheme = ecalloc(LENGTH(colors), sizeof(Scm));
1592	for (i = 0; i < LENGTH(colors); i++)
1593		scheme[i] = drw_scm_create(drw, colors[i], 3);
1594	/* init bars */
1595	updatebars();
1596	updatestatus();
1597	/* supporting window for NetWMCheck */
1598	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1599	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1600		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1601	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1602		PropModeReplace, (unsigned char *) "dwm", 4);
1603	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1604		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1605	/* EWMH support per view */
1606	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1607			PropModeReplace, (unsigned char *) netatom, NetLast);
1608	XDeleteProperty(dpy, root, netatom[NetClientList]);
1609	/* select for events */
1610	wa.cursor = cursor[CurNormal]->cursor;
1611	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1612	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1613	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1614	XSelectInput(dpy, root, wa.event_mask);
1615	grabkeys();
1616	focus(NULL);
1617}
1618
1619void
1620showhide(Client *c)
1621{
1622	if (!c)
1623		return;
1624	if (ISVISIBLE(c)) {
1625		/* show clients top down */
1626		XMoveWindow(dpy, c->win, c->x, c->y);
1627		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1628			resize(c, c->x, c->y, c->w, c->h, 0);
1629		showhide(c->snext);
1630	} else {
1631		/* hide clients bottom up */
1632		showhide(c->snext);
1633		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1634	}
1635}
1636
1637void
1638sigchld(int unused)
1639{
1640	if (signal(SIGCHLD, sigchld) == SIG_ERR)
1641		die("can't install SIGCHLD handler:");
1642	while (0 < waitpid(-1, NULL, WNOHANG));
1643}
1644
1645void
1646spawn(const Arg *arg)
1647{
1648	if (arg->v == dmenucmd)
1649		dmenumon[0] = '0' + selmon->num;
1650	if (fork() == 0) {
1651		if (dpy)
1652			close(ConnectionNumber(dpy));
1653		setsid();
1654		execvp(((char **)arg->v)[0], (char **)arg->v);
1655		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1656		perror(" failed");
1657		exit(EXIT_SUCCESS);
1658	}
1659}
1660
1661void
1662tag(const Arg *arg)
1663{
1664	if (selmon->sel && arg->ui & TAGMASK) {
1665		selmon->sel->tags = arg->ui & TAGMASK;
1666		focus(NULL);
1667		arrange(selmon);
1668	}
1669}
1670
1671void
1672tagmon(const Arg *arg)
1673{
1674	if (!selmon->sel || !mons->next)
1675		return;
1676	sendmon(selmon->sel, dirtomon(arg->i));
1677}
1678
1679void
1680tile(Monitor *m)
1681{
1682	unsigned int i, n, h, mw, my, ty;
1683	Client *c;
1684
1685	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1686	if (n == 0)
1687		return;
1688
1689	if (n > m->nmaster)
1690		mw = m->nmaster ? m->ww * m->mfact : 0;
1691	else
1692		mw = m->ww;
1693	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1694		if (i < m->nmaster) {
1695			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1696			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1697			my += HEIGHT(c);
1698		} else {
1699			h = (m->wh - ty) / (n - i);
1700			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1701			ty += HEIGHT(c);
1702		}
1703}
1704
1705void
1706togglebar(const Arg *arg)
1707{
1708	selmon->showbar = !selmon->showbar;
1709	updatebarpos(selmon);
1710	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1711	arrange(selmon);
1712}
1713
1714void
1715togglefloating(const Arg *arg)
1716{
1717	if (!selmon->sel)
1718		return;
1719	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1720		return;
1721	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1722	if (selmon->sel->isfloating)
1723		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1724		       selmon->sel->w, selmon->sel->h, 0);
1725	arrange(selmon);
1726}
1727
1728void
1729toggletag(const Arg *arg)
1730{
1731	unsigned int newtags;
1732
1733	if (!selmon->sel)
1734		return;
1735	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1736	if (newtags) {
1737		selmon->sel->tags = newtags;
1738		focus(NULL);
1739		arrange(selmon);
1740	}
1741}
1742
1743void
1744toggleview(const Arg *arg)
1745{
1746	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1747
1748	if (newtagset) {
1749		selmon->tagset[selmon->seltags] = newtagset;
1750		focus(NULL);
1751		arrange(selmon);
1752	}
1753}
1754
1755void
1756unfocus(Client *c, int setfocus)
1757{
1758	if (!c)
1759		return;
1760	grabbuttons(c, 0);
1761	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1762	if (setfocus) {
1763		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1764		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1765	}
1766}
1767
1768void
1769unmanage(Client *c, int destroyed)
1770{
1771	Monitor *m = c->mon;
1772	XWindowChanges wc;
1773
1774	/* The server grab construct avoids race conditions. */
1775	detach(c);
1776	detachstack(c);
1777	if (!destroyed) {
1778		wc.border_width = c->oldbw;
1779		XGrabServer(dpy);
1780		XSetErrorHandler(xerrordummy);
1781		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1782		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1783		setclientstate(c, WithdrawnState);
1784		XSync(dpy, False);
1785		XSetErrorHandler(xerror);
1786		XUngrabServer(dpy);
1787	}
1788	free(c);
1789	focus(NULL);
1790	updateclientlist();
1791	arrange(m);
1792}
1793
1794void
1795unmapnotify(XEvent *e)
1796{
1797	Client *c;
1798	XUnmapEvent *ev = &e->xunmap;
1799
1800	if ((c = wintoclient(ev->window))) {
1801		if (ev->send_event)
1802			setclientstate(c, WithdrawnState);
1803		else
1804			unmanage(c, 0);
1805	}
1806}
1807
1808void
1809updatebars(void)
1810{
1811	Monitor *m;
1812	XSetWindowAttributes wa = {
1813		.override_redirect = True,
1814		.background_pixmap = ParentRelative,
1815		.event_mask = ButtonPressMask|ExposureMask
1816	};
1817	for (m = mons; m; m = m->next) {
1818		if (m->barwin)
1819			continue;
1820		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1821		                          CopyFromParent, DefaultVisual(dpy, screen),
1822		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1823		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1824		XMapRaised(dpy, m->barwin);
1825	}
1826}
1827
1828void
1829updatebarpos(Monitor *m)
1830{
1831	m->wy = m->my;
1832	m->wh = m->mh;
1833	if (m->showbar) {
1834		m->wh -= bh;
1835		m->by = m->topbar ? m->wy : m->wy + m->wh;
1836		m->wy = m->topbar ? m->wy + bh : m->wy;
1837	} else
1838		m->by = -bh;
1839}
1840
1841void
1842updateclientlist()
1843{
1844	Client *c;
1845	Monitor *m;
1846
1847	XDeleteProperty(dpy, root, netatom[NetClientList]);
1848	for (m = mons; m; m = m->next)
1849		for (c = m->clients; c; c = c->next)
1850			XChangeProperty(dpy, root, netatom[NetClientList],
1851			                XA_WINDOW, 32, PropModeAppend,
1852			                (unsigned char *) &(c->win), 1);
1853}
1854
1855int
1856updategeom(void)
1857{
1858	int dirty = 0;
1859
1860#ifdef XINERAMA
1861	if (XineramaIsActive(dpy)) {
1862		int i, j, n, nn;
1863		Client *c;
1864		Monitor *m;
1865		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1866		XineramaScreenInfo *unique = NULL;
1867
1868		for (n = 0, m = mons; m; m = m->next, n++);
1869		/* only consider unique geometries as separate screens */
1870		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1871		for (i = 0, j = 0; i < nn; i++)
1872			if (isuniquegeom(unique, j, &info[i]))
1873				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1874		XFree(info);
1875		nn = j;
1876		if (n <= nn) {
1877			for (i = 0; i < (nn - n); i++) { /* new monitors available */
1878				for (m = mons; m && m->next; m = m->next);
1879				if (m)
1880					m->next = createmon();
1881				else
1882					mons = createmon();
1883			}
1884			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1885				if (i >= n
1886				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1887				    || unique[i].width != m->mw || unique[i].height != m->mh))
1888				{
1889					dirty = 1;
1890					m->num = i;
1891					m->mx = m->wx = unique[i].x_org;
1892					m->my = m->wy = unique[i].y_org;
1893					m->mw = m->ww = unique[i].width;
1894					m->mh = m->wh = unique[i].height;
1895					updatebarpos(m);
1896				}
1897		} else {
1898			/* less monitors available nn < n */
1899			for (i = nn; i < n; i++) {
1900				for (m = mons; m && m->next; m = m->next);
1901				while (m->clients) {
1902					dirty = 1;
1903					c = m->clients;
1904					m->clients = c->next;
1905					detachstack(c);
1906					c->mon = mons;
1907					attach(c);
1908					attachstack(c);
1909				}
1910				if (m == selmon)
1911					selmon = mons;
1912				cleanupmon(m);
1913			}
1914		}
1915		free(unique);
1916	} else
1917#endif /* XINERAMA */
1918	/* default monitor setup */
1919	{
1920		if (!mons)
1921			mons = createmon();
1922		if (mons->mw != sw || mons->mh != sh) {
1923			dirty = 1;
1924			mons->mw = mons->ww = sw;
1925			mons->mh = mons->wh = sh;
1926			updatebarpos(mons);
1927		}
1928	}
1929	if (dirty) {
1930		selmon = mons;
1931		selmon = wintomon(root);
1932	}
1933	return dirty;
1934}
1935
1936void
1937updatenumlockmask(void)
1938{
1939	unsigned int i, j;
1940	XModifierKeymap *modmap;
1941
1942	numlockmask = 0;
1943	modmap = XGetModifierMapping(dpy);
1944	for (i = 0; i < 8; i++)
1945		for (j = 0; j < modmap->max_keypermod; j++)
1946			if (modmap->modifiermap[i * modmap->max_keypermod + j]
1947			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1948				numlockmask = (1 << i);
1949	XFreeModifiermap(modmap);
1950}
1951
1952void
1953updatesizehints(Client *c)
1954{
1955	long msize;
1956	XSizeHints size;
1957
1958	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1959		/* size is uninitialized, ensure that size.flags aren't used */
1960		size.flags = PSize;
1961	if (size.flags & PBaseSize) {
1962		c->basew = size.base_width;
1963		c->baseh = size.base_height;
1964	} else if (size.flags & PMinSize) {
1965		c->basew = size.min_width;
1966		c->baseh = size.min_height;
1967	} else
1968		c->basew = c->baseh = 0;
1969	if (size.flags & PResizeInc) {
1970		c->incw = size.width_inc;
1971		c->inch = size.height_inc;
1972	} else
1973		c->incw = c->inch = 0;
1974	if (size.flags & PMaxSize) {
1975		c->maxw = size.max_width;
1976		c->maxh = size.max_height;
1977	} else
1978		c->maxw = c->maxh = 0;
1979	if (size.flags & PMinSize) {
1980		c->minw = size.min_width;
1981		c->minh = size.min_height;
1982	} else if (size.flags & PBaseSize) {
1983		c->minw = size.base_width;
1984		c->minh = size.base_height;
1985	} else
1986		c->minw = c->minh = 0;
1987	if (size.flags & PAspect) {
1988		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1989		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1990	} else
1991		c->maxa = c->mina = 0.0;
1992	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1993	             && c->maxw == c->minw && c->maxh == c->minh);
1994}
1995
1996void
1997updatetitle(Client *c)
1998{
1999	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2000		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2001	if (c->name[0] == '\0') /* hack to mark broken clients */
2002		strcpy(c->name, broken);
2003}
2004
2005void
2006updatestatus(void)
2007{
2008	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2009		strcpy(stext, "dwm-"VERSION);
2010	drawbar(selmon);
2011}
2012
2013void
2014updatewindowtype(Client *c)
2015{
2016	Atom state = getatomprop(c, netatom[NetWMState]);
2017	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2018
2019	if (state == netatom[NetWMFullscreen])
2020		setfullscreen(c, 1);
2021	if (wtype == netatom[NetWMWindowTypeDialog])
2022		c->isfloating = 1;
2023}
2024
2025void
2026updatewmhints(Client *c)
2027{
2028	XWMHints *wmh;
2029
2030	if ((wmh = XGetWMHints(dpy, c->win))) {
2031		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2032			wmh->flags &= ~XUrgencyHint;
2033			XSetWMHints(dpy, c->win, wmh);
2034		} else
2035			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2036		if (wmh->flags & InputHint)
2037			c->neverfocus = !wmh->input;
2038		else
2039			c->neverfocus = 0;
2040		XFree(wmh);
2041	}
2042}
2043
2044void
2045view(const Arg *arg)
2046{
2047	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2048		return;
2049	selmon->seltags ^= 1; /* toggle sel tagset */
2050	if (arg->ui & TAGMASK)
2051		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2052	focus(NULL);
2053	arrange(selmon);
2054}
2055
2056Client *
2057wintoclient(Window w)
2058{
2059	Client *c;
2060	Monitor *m;
2061
2062	for (m = mons; m; m = m->next)
2063		for (c = m->clients; c; c = c->next)
2064			if (c->win == w)
2065				return c;
2066	return NULL;
2067}
2068
2069Monitor *
2070wintomon(Window w)
2071{
2072	int x, y;
2073	Client *c;
2074	Monitor *m;
2075
2076	if (w == root && getrootptr(&x, &y))
2077		return recttomon(x, y, 1, 1);
2078	for (m = mons; m; m = m->next)
2079		if (w == m->barwin)
2080			return m;
2081	if ((c = wintoclient(w)))
2082		return c->mon;
2083	return selmon;
2084}
2085
2086/* There's no way to check accesses to destroyed windows, thus those cases are
2087 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2088 * default error handler, which may call exit.  */
2089int
2090xerror(Display *dpy, XErrorEvent *ee)
2091{
2092	if (ee->error_code == BadWindow
2093	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2094	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2095	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2096	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2097	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2098	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2099	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2100	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2101		return 0;
2102	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2103			ee->request_code, ee->error_code);
2104	return xerrorxlib(dpy, ee); /* may call exit */
2105}
2106
2107int
2108xerrordummy(Display *dpy, XErrorEvent *ee)
2109{
2110	return 0;
2111}
2112
2113/* Startup Error handler to check if another window manager
2114 * is already running. */
2115int
2116xerrorstart(Display *dpy, XErrorEvent *ee)
2117{
2118	die("dwm: another window manager is already running");
2119	return -1;
2120}
2121
2122void
2123zoom(const Arg *arg)
2124{
2125	Client *c = selmon->sel;
2126
2127	if (!selmon->lt[selmon->sellt]->arrange
2128	|| (selmon->sel && selmon->sel->isfloating))
2129		return;
2130	if (c == nexttiled(selmon->clients))
2131		if (!c || !(c = nexttiled(c->next)))
2132			return;
2133	pop(c);
2134}
2135
2136int
2137main(int argc, char *argv[])
2138{
2139	if (argc == 2 && !strcmp("-v", argv[1]))
2140		die("dwm-"VERSION);
2141	else if (argc != 1)
2142		die("usage: dwm [-v]");
2143	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2144		fputs("warning: no locale support\n", stderr);
2145	if (!(dpy = XOpenDisplay(NULL)))
2146		die("dwm: cannot open display");
2147	checkotherwm();
2148	setup();
2149	scan();
2150	run();
2151	cleanup();
2152	XCloseDisplay(dpy);
2153	return EXIT_SUCCESS;
2154}