1/* See LICENSE file for copyright and license details.
   2 *
   3 * dynamic window manager is designed like any other X client as well. It is
   4 * driven through handling X events. In contrast to other X clients, a window
   5 * manager selects for SubstructureRedirectMask on the root window, to receive
   6 * events about window (dis-)appearance. Only one X connection at a time is
   7 * allowed to select for this event mask.
   8 *
   9 * The event handlers of dwm are organized in an array which is accessed
  10 * whenever a new event has been fetched. This allows event dispatching
  11 * in O(1) time.
  12 *
  13 * Each child of the root window is called a client, except windows which have
  14 * set the override_redirect flag. Clients are organized in a linked client
  15 * list on each monitor, the focus history is remembered through a stack list
  16 * on each monitor. Each client contains a bit array to indicate the tags of a
  17 * client.
  18 *
  19 * Keys and tagging rules are organized as arrays and defined in config.h.
  20 *
  21 * To understand everything else, start reading main().
  22 */
  23#include <errno.h>
  24#include <locale.h>
  25#include <signal.h>
  26#include <stdarg.h>
  27#include <stdio.h>
  28#include <stdlib.h>
  29#include <string.h>
  30#include <unistd.h>
  31#include <sys/types.h>
  32#include <sys/wait.h>
  33#include <X11/cursorfont.h>
  34#include <X11/keysym.h>
  35#include <X11/Xatom.h>
  36#include <X11/Xlib.h>
  37#include <X11/Xproto.h>
  38#include <X11/Xutil.h>
  39#ifdef XINERAMA
  40#include <X11/extensions/Xinerama.h>
  41#endif /* XINERAMA */
  42#include <X11/Xft/Xft.h>
  43
  44#include "drw.h"
  45#include "util.h"
  46
  47/* macros */
  48#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  49#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  50#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  51                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  52#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  53#define LENGTH(X)               (sizeof X / sizeof X[0])
  54#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  55#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  56#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  57#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  58#define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  59#define ColBorder               2
  60
  61/* enums */
  62enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  63enum { SchemeNorm, SchemeSel }; /* color schemes */
  64enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  65       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  66       NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  67enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  68enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  69       ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  70
  71typedef union {
  72	int i;
  73	unsigned int ui;
  74	float f;
  75	const void *v;
  76} Arg;
  77
  78typedef struct {
  79	unsigned int click;
  80	unsigned int mask;
  81	unsigned int button;
  82	void (*func)(const Arg *arg);
  83	const Arg arg;
  84} Button;
  85
  86typedef struct Monitor Monitor;
  87typedef struct Client Client;
  88struct Client {
  89	char name[256];
  90	float mina, maxa;
  91	int x, y, w, h;
  92	int oldx, oldy, oldw, oldh;
  93	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  94	int bw, oldbw;
  95	unsigned int tags;
  96	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  97	Client *next;
  98	Client *snext;
  99	Monitor *mon;
 100	Window win;
 101};
 102
 103typedef struct {
 104	unsigned int mod;
 105	KeySym keysym;
 106	void (*func)(const Arg *);
 107	const Arg arg;
 108} Key;
 109
 110typedef struct {
 111	const char *symbol;
 112	void (*arrange)(Monitor *);
 113} Layout;
 114
 115struct Monitor {
 116	char ltsymbol[16];
 117	float mfact;
 118	int nmaster;
 119	int num;
 120	int by;               /* bar geometry */
 121	int mx, my, mw, mh;   /* screen size */
 122	int wx, wy, ww, wh;   /* window area  */
 123	unsigned int seltags;
 124	unsigned int sellt;
 125	unsigned int tagset[2];
 126	int showbar;
 127	int topbar;
 128	Client *clients;
 129	Client *sel;
 130	Client *stack;
 131	Monitor *next;
 132	Window barwin;
 133	const Layout *lt[2];
 134};
 135
 136typedef struct {
 137	const char *class;
 138	const char *instance;
 139	const char *title;
 140	unsigned int tags;
 141	int isfloating;
 142	int monitor;
 143} Rule;
 144
 145/* function declarations */
 146static void applyrules(Client *c);
 147static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 148static void arrange(Monitor *m);
 149static void arrangemon(Monitor *m);
 150static void attach(Client *c);
 151static void attachstack(Client *c);
 152static void buttonpress(XEvent *e);
 153static void checkotherwm(void);
 154static void cleanup(void);
 155static void cleanupmon(Monitor *mon);
 156static void clientmessage(XEvent *e);
 157static void configure(Client *c);
 158static void configurenotify(XEvent *e);
 159static void configurerequest(XEvent *e);
 160static Monitor *createmon(void);
 161static void destroynotify(XEvent *e);
 162static void detach(Client *c);
 163static void detachstack(Client *c);
 164static Monitor *dirtomon(int dir);
 165static void drawbar(Monitor *m);
 166static void drawbars(void);
 167static void enternotify(XEvent *e);
 168static void expose(XEvent *e);
 169static void focus(Client *c);
 170static void focusin(XEvent *e);
 171static void focusmon(const Arg *arg);
 172static void focusstack(const Arg *arg);
 173static int getrootptr(int *x, int *y);
 174static long getstate(Window w);
 175static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 176static void grabbuttons(Client *c, int focused);
 177static void grabkeys(void);
 178static void incnmaster(const Arg *arg);
 179static void keypress(XEvent *e);
 180static void killclient(const Arg *arg);
 181static void manage(Window w, XWindowAttributes *wa);
 182static void mappingnotify(XEvent *e);
 183static void maprequest(XEvent *e);
 184static void monocle(Monitor *m);
 185static void motionnotify(XEvent *e);
 186static void movemouse(const Arg *arg);
 187static Client *nexttiled(Client *c);
 188static void pop(Client *);
 189static void propertynotify(XEvent *e);
 190static void quit(const Arg *arg);
 191static Monitor *recttomon(int x, int y, int w, int h);
 192static void resize(Client *c, int x, int y, int w, int h, int interact);
 193static void resizeclient(Client *c, int x, int y, int w, int h);
 194static void resizemouse(const Arg *arg);
 195static void restack(Monitor *m);
 196static void run(void);
 197static void scan(void);
 198static int sendevent(Client *c, Atom proto);
 199static void sendmon(Client *c, Monitor *m);
 200static void setclientstate(Client *c, long state);
 201static void setfocus(Client *c);
 202static void setfullscreen(Client *c, int fullscreen);
 203static void setlayout(const Arg *arg);
 204static void setmfact(const Arg *arg);
 205static void setup(void);
 206static void seturgent(Client *c, int urg);
 207static void showhide(Client *c);
 208static void sigchld(int unused);
 209static void spawn(const Arg *arg);
 210static void tag(const Arg *arg);
 211static void tagmon(const Arg *arg);
 212static void tile(Monitor *);
 213static void togglebar(const Arg *arg);
 214static void togglefloating(const Arg *arg);
 215static void toggletag(const Arg *arg);
 216static void toggleview(const Arg *arg);
 217static void unfocus(Client *c, int setfocus);
 218static void unmanage(Client *c, int destroyed);
 219static void unmapnotify(XEvent *e);
 220static int updategeom(void);
 221static void updatebarpos(Monitor *m);
 222static void updatebars(void);
 223static void updateclientlist(void);
 224static void updatenumlockmask(void);
 225static void updatesizehints(Client *c);
 226static void updatestatus(void);
 227static void updatewindowtype(Client *c);
 228static void updatetitle(Client *c);
 229static void updatewmhints(Client *c);
 230static void view(const Arg *arg);
 231static Client *wintoclient(Window w);
 232static Monitor *wintomon(Window w);
 233static int xerror(Display *dpy, XErrorEvent *ee);
 234static int xerrordummy(Display *dpy, XErrorEvent *ee);
 235static int xerrorstart(Display *dpy, XErrorEvent *ee);
 236static void zoom(const Arg *arg);
 237
 238/* variables */
 239static const char broken[] = "broken";
 240static char stext[256];
 241static int screen;
 242static int sw, sh;           /* X display screen geometry width, height */
 243static int bh, blw = 0;      /* bar geometry */
 244static int lrpad;            /* sum of left and right padding for text */
 245static int (*xerrorxlib)(Display *, XErrorEvent *);
 246static unsigned int numlockmask = 0;
 247static void (*handler[LASTEvent]) (XEvent *) = {
 248	[ButtonPress] = buttonpress,
 249	[ClientMessage] = clientmessage,
 250	[ConfigureRequest] = configurerequest,
 251	[ConfigureNotify] = configurenotify,
 252	[DestroyNotify] = destroynotify,
 253	[EnterNotify] = enternotify,
 254	[Expose] = expose,
 255	[FocusIn] = focusin,
 256	[KeyPress] = keypress,
 257	[MappingNotify] = mappingnotify,
 258	[MapRequest] = maprequest,
 259	[MotionNotify] = motionnotify,
 260	[PropertyNotify] = propertynotify,
 261	[UnmapNotify] = unmapnotify
 262};
 263static Atom wmatom[WMLast], netatom[NetLast];
 264static int running = 1;
 265static Cur *cursor[CurLast];
 266static Scm *scheme;
 267static Display *dpy;
 268static Drw *drw;
 269static Monitor *mons, *selmon;
 270static Window root, wmcheckwin;
 271
 272/* configuration, allows nested code to access above variables */
 273#include "config.h"
 274
 275/* compile-time check if all tags fit into an unsigned int bit array. */
 276struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 277
 278/* function implementations */
 279void
 280applyrules(Client *c)
 281{
 282	const char *class, *instance;
 283	unsigned int i;
 284	const Rule *r;
 285	Monitor *m;
 286	XClassHint ch = { NULL, NULL };
 287
 288	/* rule matching */
 289	c->isfloating = 0;
 290	c->tags = 0;
 291	XGetClassHint(dpy, c->win, &ch);
 292	class    = ch.res_class ? ch.res_class : broken;
 293	instance = ch.res_name  ? ch.res_name  : broken;
 294
 295	for (i = 0; i < LENGTH(rules); i++) {
 296		r = &rules[i];
 297		if ((!r->title || strstr(c->name, r->title))
 298		&& (!r->class || strstr(class, r->class))
 299		&& (!r->instance || strstr(instance, r->instance)))
 300		{
 301			c->isfloating = r->isfloating;
 302			c->tags |= r->tags;
 303			for (m = mons; m && m->num != r->monitor; m = m->next);
 304			if (m)
 305				c->mon = m;
 306		}
 307	}
 308	if (ch.res_class)
 309		XFree(ch.res_class);
 310	if (ch.res_name)
 311		XFree(ch.res_name);
 312	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 313}
 314
 315int
 316applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 317{
 318	int baseismin;
 319	Monitor *m = c->mon;
 320
 321	/* set minimum possible */
 322	*w = MAX(1, *w);
 323	*h = MAX(1, *h);
 324	if (interact) {
 325		if (*x > sw)
 326			*x = sw - WIDTH(c);
 327		if (*y > sh)
 328			*y = sh - HEIGHT(c);
 329		if (*x + *w + 2 * c->bw < 0)
 330			*x = 0;
 331		if (*y + *h + 2 * c->bw < 0)
 332			*y = 0;
 333	} else {
 334		if (*x >= m->wx + m->ww)
 335			*x = m->wx + m->ww - WIDTH(c);
 336		if (*y >= m->wy + m->wh)
 337			*y = m->wy + m->wh - HEIGHT(c);
 338		if (*x + *w + 2 * c->bw <= m->wx)
 339			*x = m->wx;
 340		if (*y + *h + 2 * c->bw <= m->wy)
 341			*y = m->wy;
 342	}
 343	if (*h < bh)
 344		*h = bh;
 345	if (*w < bh)
 346		*w = bh;
 347	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 348		/* see last two sentences in ICCCM 4.1.2.3 */
 349		baseismin = c->basew == c->minw && c->baseh == c->minh;
 350		if (!baseismin) { /* temporarily remove base dimensions */
 351			*w -= c->basew;
 352			*h -= c->baseh;
 353		}
 354		/* adjust for aspect limits */
 355		if (c->mina > 0 && c->maxa > 0) {
 356			if (c->maxa < (float)*w / *h)
 357				*w = *h * c->maxa + 0.5;
 358			else if (c->mina < (float)*h / *w)
 359				*h = *w * c->mina + 0.5;
 360		}
 361		if (baseismin) { /* increment calculation requires this */
 362			*w -= c->basew;
 363			*h -= c->baseh;
 364		}
 365		/* adjust for increment value */
 366		if (c->incw)
 367			*w -= *w % c->incw;
 368		if (c->inch)
 369			*h -= *h % c->inch;
 370		/* restore base dimensions */
 371		*w = MAX(*w + c->basew, c->minw);
 372		*h = MAX(*h + c->baseh, c->minh);
 373		if (c->maxw)
 374			*w = MIN(*w, c->maxw);
 375		if (c->maxh)
 376			*h = MIN(*h, c->maxh);
 377	}
 378	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 379}
 380
 381void
 382arrange(Monitor *m)
 383{
 384	if (m)
 385		showhide(m->stack);
 386	else for (m = mons; m; m = m->next)
 387		showhide(m->stack);
 388	if (m) {
 389		arrangemon(m);
 390		restack(m);
 391	} else for (m = mons; m; m = m->next)
 392		arrangemon(m);
 393}
 394
 395void
 396arrangemon(Monitor *m)
 397{
 398	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 399	if (m->lt[m->sellt]->arrange)
 400		m->lt[m->sellt]->arrange(m);
 401}
 402
 403void
 404attach(Client *c)
 405{
 406	c->next = c->mon->clients;
 407	c->mon->clients = c;
 408}
 409
 410void
 411attachstack(Client *c)
 412{
 413	c->snext = c->mon->stack;
 414	c->mon->stack = c;
 415}
 416
 417void
 418buttonpress(XEvent *e)
 419{
 420	unsigned int i, x, click;
 421	Arg arg = {0};
 422	Client *c;
 423	Monitor *m;
 424	XButtonPressedEvent *ev = &e->xbutton;
 425
 426	click = ClkRootWin;
 427	/* focus monitor if necessary */
 428	if ((m = wintomon(ev->window)) && m != selmon) {
 429		unfocus(selmon->sel, 1);
 430		selmon = m;
 431		focus(NULL);
 432	}
 433	if (ev->window == selmon->barwin) {
 434		i = x = 0;
 435		do
 436			x += TEXTW(tags[i]);
 437		while (ev->x >= x && ++i < LENGTH(tags));
 438		if (i < LENGTH(tags)) {
 439			click = ClkTagBar;
 440			arg.ui = 1 << i;
 441		} else if (ev->x < x + blw)
 442			click = ClkLtSymbol;
 443		else if (ev->x > selmon->ww - TEXTW(stext))
 444			click = ClkStatusText;
 445		else
 446			click = ClkWinTitle;
 447	} else if ((c = wintoclient(ev->window))) {
 448		focus(c);
 449		restack(selmon);
 450		XAllowEvents(dpy, ReplayPointer, CurrentTime);
 451		click = ClkClientWin;
 452	}
 453	for (i = 0; i < LENGTH(buttons); i++)
 454		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 455		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 456			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 457}
 458
 459void
 460checkotherwm(void)
 461{
 462	xerrorxlib = XSetErrorHandler(xerrorstart);
 463	/* this causes an error if some other window manager is running */
 464	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 465	XSync(dpy, False);
 466	XSetErrorHandler(xerror);
 467	XSync(dpy, False);
 468}
 469
 470void
 471cleanup(void)
 472{
 473	Arg a = {.ui = ~0};
 474	Layout foo = { "", NULL };
 475	Monitor *m;
 476	size_t i;
 477
 478	view(&a);
 479	selmon->lt[selmon->sellt] = &foo;
 480	for (m = mons; m; m = m->next)
 481		while (m->stack)
 482			unmanage(m->stack, 0);
 483	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 484	while (mons)
 485		cleanupmon(mons);
 486	for (i = 0; i < CurLast; i++)
 487		drw_cur_free(drw, cursor[i]);
 488	for (i = 0; i < LENGTH(colors); i++)
 489		free(scheme[i]);
 490	XDestroyWindow(dpy, wmcheckwin);
 491	drw_free(drw);
 492	XSync(dpy, False);
 493	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 494	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 495}
 496
 497void
 498cleanupmon(Monitor *mon)
 499{
 500	Monitor *m;
 501
 502	if (mon == mons)
 503		mons = mons->next;
 504	else {
 505		for (m = mons; m && m->next != mon; m = m->next);
 506		m->next = mon->next;
 507	}
 508	XUnmapWindow(dpy, mon->barwin);
 509	XDestroyWindow(dpy, mon->barwin);
 510	free(mon);
 511}
 512
 513void
 514clientmessage(XEvent *e)
 515{
 516	XClientMessageEvent *cme = &e->xclient;
 517	Client *c = wintoclient(cme->window);
 518
 519	if (!c)
 520		return;
 521	if (cme->message_type == netatom[NetWMState]) {
 522		if (cme->data.l[1] == netatom[NetWMFullscreen]
 523		|| cme->data.l[2] == netatom[NetWMFullscreen])
 524			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 525				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 526	} else if (cme->message_type == netatom[NetActiveWindow]) {
 527		if (c != selmon->sel && !c->isurgent)
 528			seturgent(c, 1);
 529	}
 530}
 531
 532void
 533configure(Client *c)
 534{
 535	XConfigureEvent ce;
 536
 537	ce.type = ConfigureNotify;
 538	ce.display = dpy;
 539	ce.event = c->win;
 540	ce.window = c->win;
 541	ce.x = c->x;
 542	ce.y = c->y;
 543	ce.width = c->w;
 544	ce.height = c->h;
 545	ce.border_width = c->bw;
 546	ce.above = None;
 547	ce.override_redirect = False;
 548	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 549}
 550
 551void
 552configurenotify(XEvent *e)
 553{
 554	Monitor *m;
 555	Client *c;
 556	XConfigureEvent *ev = &e->xconfigure;
 557	int dirty;
 558
 559	/* TODO: updategeom handling sucks, needs to be simplified */
 560	if (ev->window == root) {
 561		dirty = (sw != ev->width || sh != ev->height);
 562		sw = ev->width;
 563		sh = ev->height;
 564		if (updategeom() || dirty) {
 565			drw_resize(drw, sw, bh);
 566			updatebars();
 567			for (m = mons; m; m = m->next) {
 568				for (c = m->clients; c; c = c->next)
 569					if (c->isfullscreen)
 570						resizeclient(c, m->mx, m->my, m->mw, m->mh);
 571				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 572			}
 573			focus(NULL);
 574			arrange(NULL);
 575		}
 576	}
 577}
 578
 579void
 580configurerequest(XEvent *e)
 581{
 582	Client *c;
 583	Monitor *m;
 584	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 585	XWindowChanges wc;
 586
 587	if ((c = wintoclient(ev->window))) {
 588		if (ev->value_mask & CWBorderWidth)
 589			c->bw = ev->border_width;
 590		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 591			m = c->mon;
 592			if (ev->value_mask & CWX) {
 593				c->oldx = c->x;
 594				c->x = m->mx + ev->x;
 595			}
 596			if (ev->value_mask & CWY) {
 597				c->oldy = c->y;
 598				c->y = m->my + ev->y;
 599			}
 600			if (ev->value_mask & CWWidth) {
 601				c->oldw = c->w;
 602				c->w = ev->width;
 603			}
 604			if (ev->value_mask & CWHeight) {
 605				c->oldh = c->h;
 606				c->h = ev->height;
 607			}
 608			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 609				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 610			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 611				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 612			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 613				configure(c);
 614			if (ISVISIBLE(c))
 615				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 616		} else
 617			configure(c);
 618	} else {
 619		wc.x = ev->x;
 620		wc.y = ev->y;
 621		wc.width = ev->width;
 622		wc.height = ev->height;
 623		wc.border_width = ev->border_width;
 624		wc.sibling = ev->above;
 625		wc.stack_mode = ev->detail;
 626		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 627	}
 628	XSync(dpy, False);
 629}
 630
 631Monitor *
 632createmon(void)
 633{
 634	Monitor *m;
 635
 636	m = ecalloc(1, sizeof(Monitor));
 637	m->tagset[0] = m->tagset[1] = 1;
 638	m->mfact = mfact;
 639	m->nmaster = nmaster;
 640	m->showbar = showbar;
 641	m->topbar = topbar;
 642	m->lt[0] = &layouts[0];
 643	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 644	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 645	return m;
 646}
 647
 648void
 649destroynotify(XEvent *e)
 650{
 651	Client *c;
 652	XDestroyWindowEvent *ev = &e->xdestroywindow;
 653
 654	if ((c = wintoclient(ev->window)))
 655		unmanage(c, 1);
 656}
 657
 658void
 659detach(Client *c)
 660{
 661	Client **tc;
 662
 663	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 664	*tc = c->next;
 665}
 666
 667void
 668detachstack(Client *c)
 669{
 670	Client **tc, *t;
 671
 672	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 673	*tc = c->snext;
 674
 675	if (c == c->mon->sel) {
 676		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 677		c->mon->sel = t;
 678	}
 679}
 680
 681Monitor *
 682dirtomon(int dir)
 683{
 684	Monitor *m = NULL;
 685
 686	if (dir > 0) {
 687		if (!(m = selmon->next))
 688			m = mons;
 689	} else if (selmon == mons)
 690		for (m = mons; m->next; m = m->next);
 691	else
 692		for (m = mons; m->next != selmon; m = m->next);
 693	return m;
 694}
 695
 696void
 697drawbar(Monitor *m)
 698{
 699	int x, w, sw = 0;
 700	int boxs = drw->fonts->h / 9;
 701	int boxw = drw->fonts->h / 6 + 2;
 702	unsigned int i, occ = 0, urg = 0;
 703	Client *c;
 704
 705	/* draw status first so it can be overdrawn by tags later */
 706	if (m == selmon) { /* status is only drawn on selected monitor */
 707		drw_setscheme(drw, scheme[SchemeNorm]);
 708		sw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 709		drw_text(drw, m->ww - sw, 0, sw, bh, 0, stext, 0);
 710	}
 711
 712	for (c = m->clients; c; c = c->next) {
 713		occ |= c->tags;
 714		if (c->isurgent)
 715			urg |= c->tags;
 716	}
 717	x = 0;
 718	for (i = 0; i < LENGTH(tags); i++) {
 719		w = TEXTW(tags[i]);
 720		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 721		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 722		if (occ & 1 << i)
 723			drw_rect(drw, x + boxs, boxs, boxw, boxw,
 724				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 725				urg & 1 << i);
 726		x += w;
 727	}
 728	w = blw = TEXTW(m->ltsymbol);
 729	drw_setscheme(drw, scheme[SchemeNorm]);
 730	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 731
 732	if ((w = m->ww - sw - x) > bh) {
 733		if (m->sel) {
 734			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 735			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 736			if (m->sel->isfloating)
 737				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 738		} else {
 739			drw_setscheme(drw, scheme[SchemeNorm]);
 740			drw_rect(drw, x, 0, w, bh, 1, 1);
 741		}
 742	}
 743	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 744}
 745
 746void
 747drawbars(void)
 748{
 749	Monitor *m;
 750
 751	for (m = mons; m; m = m->next)
 752		drawbar(m);
 753}
 754
 755void
 756enternotify(XEvent *e)
 757{
 758	Client *c;
 759	Monitor *m;
 760	XCrossingEvent *ev = &e->xcrossing;
 761
 762	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 763		return;
 764	c = wintoclient(ev->window);
 765	m = c ? c->mon : wintomon(ev->window);
 766	if (m != selmon) {
 767		unfocus(selmon->sel, 1);
 768		selmon = m;
 769	} else if (!c || c == selmon->sel)
 770		return;
 771	focus(c);
 772}
 773
 774void
 775expose(XEvent *e)
 776{
 777	Monitor *m;
 778	XExposeEvent *ev = &e->xexpose;
 779
 780	if (ev->count == 0 && (m = wintomon(ev->window)))
 781		drawbar(m);
 782}
 783
 784void
 785focus(Client *c)
 786{
 787	if (!c || !ISVISIBLE(c))
 788		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 789	if (selmon->sel && selmon->sel != c)
 790		unfocus(selmon->sel, 0);
 791	if (c) {
 792		if (c->mon != selmon)
 793			selmon = c->mon;
 794		if (c->isurgent)
 795			seturgent(c, 0);
 796		detachstack(c);
 797		attachstack(c);
 798		grabbuttons(c, 1);
 799		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 800		setfocus(c);
 801	} else {
 802		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 803		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 804	}
 805	selmon->sel = c;
 806	drawbars();
 807}
 808
 809/* there are some broken focus acquiring clients needing extra handling */
 810void
 811focusin(XEvent *e)
 812{
 813	XFocusChangeEvent *ev = &e->xfocus;
 814
 815	if (selmon->sel && ev->window != selmon->sel->win)
 816		setfocus(selmon->sel);
 817}
 818
 819void
 820focusmon(const Arg *arg)
 821{
 822	Monitor *m;
 823
 824	if (!mons->next)
 825		return;
 826	if ((m = dirtomon(arg->i)) == selmon)
 827		return;
 828	unfocus(selmon->sel, 0);
 829	selmon = m;
 830	focus(NULL);
 831}
 832
 833void
 834focusstack(const Arg *arg)
 835{
 836	Client *c = NULL, *i;
 837
 838	if (!selmon->sel)
 839		return;
 840	if (arg->i > 0) {
 841		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 842		if (!c)
 843			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 844	} else {
 845		for (i = selmon->clients; i != selmon->sel; i = i->next)
 846			if (ISVISIBLE(i))
 847				c = i;
 848		if (!c)
 849			for (; i; i = i->next)
 850				if (ISVISIBLE(i))
 851					c = i;
 852	}
 853	if (c) {
 854		focus(c);
 855		restack(selmon);
 856	}
 857}
 858
 859Atom
 860getatomprop(Client *c, Atom prop)
 861{
 862	int di;
 863	unsigned long dl;
 864	unsigned char *p = NULL;
 865	Atom da, atom = None;
 866
 867	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 868		&da, &di, &dl, &dl, &p) == Success && p) {
 869		atom = *(Atom *)p;
 870		XFree(p);
 871	}
 872	return atom;
 873}
 874
 875int
 876getrootptr(int *x, int *y)
 877{
 878	int di;
 879	unsigned int dui;
 880	Window dummy;
 881
 882	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 883}
 884
 885long
 886getstate(Window w)
 887{
 888	int format;
 889	long result = -1;
 890	unsigned char *p = NULL;
 891	unsigned long n, extra;
 892	Atom real;
 893
 894	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 895		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
 896		return -1;
 897	if (n != 0)
 898		result = *p;
 899	XFree(p);
 900	return result;
 901}
 902
 903int
 904gettextprop(Window w, Atom atom, char *text, unsigned int size)
 905{
 906	char **list = NULL;
 907	int n;
 908	XTextProperty name;
 909
 910	if (!text || size == 0)
 911		return 0;
 912	text[0] = '\0';
 913	XGetTextProperty(dpy, w, &name, atom);
 914	if (!name.nitems)
 915		return 0;
 916	if (name.encoding == XA_STRING)
 917		strncpy(text, (char *)name.value, size - 1);
 918	else {
 919		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 920			strncpy(text, *list, size - 1);
 921			XFreeStringList(list);
 922		}
 923	}
 924	text[size - 1] = '\0';
 925	XFree(name.value);
 926	return 1;
 927}
 928
 929void
 930grabbuttons(Client *c, int focused)
 931{
 932	updatenumlockmask();
 933	{
 934		unsigned int i, j;
 935		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 936		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 937		if (!focused)
 938			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 939				BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
 940		for (i = 0; i < LENGTH(buttons); i++)
 941			if (buttons[i].click == ClkClientWin)
 942				for (j = 0; j < LENGTH(modifiers); j++)
 943					XGrabButton(dpy, buttons[i].button,
 944						buttons[i].mask | modifiers[j],
 945						c->win, False, BUTTONMASK,
 946						GrabModeAsync, GrabModeSync, None, None);
 947	}
 948}
 949
 950void
 951grabkeys(void)
 952{
 953	updatenumlockmask();
 954	{
 955		unsigned int i, j;
 956		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 957		KeyCode code;
 958
 959		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 960		for (i = 0; i < LENGTH(keys); i++)
 961			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 962				for (j = 0; j < LENGTH(modifiers); j++)
 963					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 964						True, GrabModeAsync, GrabModeAsync);
 965	}
 966}
 967
 968void
 969incnmaster(const Arg *arg)
 970{
 971	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 972	arrange(selmon);
 973}
 974
 975#ifdef XINERAMA
 976static int
 977isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 978{
 979	while (n--)
 980		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 981		&& unique[n].width == info->width && unique[n].height == info->height)
 982			return 0;
 983	return 1;
 984}
 985#endif /* XINERAMA */
 986
 987void
 988keypress(XEvent *e)
 989{
 990	unsigned int i;
 991	KeySym keysym;
 992	XKeyEvent *ev;
 993
 994	ev = &e->xkey;
 995	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 996	for (i = 0; i < LENGTH(keys); i++)
 997		if (keysym == keys[i].keysym
 998		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 999		&& keys[i].func)
1000			keys[i].func(&(keys[i].arg));
1001}
1002
1003void
1004killclient(const Arg *arg)
1005{
1006	if (!selmon->sel)
1007		return;
1008	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1009		XGrabServer(dpy);
1010		XSetErrorHandler(xerrordummy);
1011		XSetCloseDownMode(dpy, DestroyAll);
1012		XKillClient(dpy, selmon->sel->win);
1013		XSync(dpy, False);
1014		XSetErrorHandler(xerror);
1015		XUngrabServer(dpy);
1016	}
1017}
1018
1019void
1020manage(Window w, XWindowAttributes *wa)
1021{
1022	Client *c, *t = NULL;
1023	Window trans = None;
1024	XWindowChanges wc;
1025
1026	c = ecalloc(1, sizeof(Client));
1027	c->win = w;
1028	/* geometry */
1029	c->x = c->oldx = wa->x;
1030	c->y = c->oldy = wa->y;
1031	c->w = c->oldw = wa->width;
1032	c->h = c->oldh = wa->height;
1033	c->oldbw = wa->border_width;
1034
1035	updatetitle(c);
1036	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1037		c->mon = t->mon;
1038		c->tags = t->tags;
1039	} else {
1040		c->mon = selmon;
1041		applyrules(c);
1042	}
1043
1044	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1045		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1046	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1047		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1048	c->x = MAX(c->x, c->mon->mx);
1049	/* only fix client y-offset, if the client center might cover the bar */
1050	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1051		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1052	c->bw = borderpx;
1053
1054	wc.border_width = c->bw;
1055	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1056	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1057	configure(c); /* propagates border_width, if size doesn't change */
1058	updatewindowtype(c);
1059	updatesizehints(c);
1060	updatewmhints(c);
1061	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1062	grabbuttons(c, 0);
1063	if (!c->isfloating)
1064		c->isfloating = c->oldstate = trans != None || c->isfixed;
1065	if (c->isfloating)
1066		XRaiseWindow(dpy, c->win);
1067	attach(c);
1068	attachstack(c);
1069	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1070		(unsigned char *) &(c->win), 1);
1071	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1072	setclientstate(c, NormalState);
1073	if (c->mon == selmon)
1074		unfocus(selmon->sel, 0);
1075	c->mon->sel = c;
1076	arrange(c->mon);
1077	XMapWindow(dpy, c->win);
1078	focus(NULL);
1079}
1080
1081void
1082mappingnotify(XEvent *e)
1083{
1084	XMappingEvent *ev = &e->xmapping;
1085
1086	XRefreshKeyboardMapping(ev);
1087	if (ev->request == MappingKeyboard)
1088		grabkeys();
1089}
1090
1091void
1092maprequest(XEvent *e)
1093{
1094	static XWindowAttributes wa;
1095	XMapRequestEvent *ev = &e->xmaprequest;
1096
1097	if (!XGetWindowAttributes(dpy, ev->window, &wa))
1098		return;
1099	if (wa.override_redirect)
1100		return;
1101	if (!wintoclient(ev->window))
1102		manage(ev->window, &wa);
1103}
1104
1105void
1106monocle(Monitor *m)
1107{
1108	unsigned int n = 0;
1109	Client *c;
1110
1111	for (c = m->clients; c; c = c->next)
1112		if (ISVISIBLE(c))
1113			n++;
1114	if (n > 0) /* override layout symbol */
1115		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1116	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1117		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1118}
1119
1120void
1121motionnotify(XEvent *e)
1122{
1123	static Monitor *mon = NULL;
1124	Monitor *m;
1125	XMotionEvent *ev = &e->xmotion;
1126
1127	if (ev->window != root)
1128		return;
1129	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1130		unfocus(selmon->sel, 1);
1131		selmon = m;
1132		focus(NULL);
1133	}
1134	mon = m;
1135}
1136
1137void
1138movemouse(const Arg *arg)
1139{
1140	int x, y, ocx, ocy, nx, ny;
1141	Client *c;
1142	Monitor *m;
1143	XEvent ev;
1144	Time lasttime = 0;
1145
1146	if (!(c = selmon->sel))
1147		return;
1148	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1149		return;
1150	restack(selmon);
1151	ocx = c->x;
1152	ocy = c->y;
1153	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1154		None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1155		return;
1156	if (!getrootptr(&x, &y))
1157		return;
1158	do {
1159		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1160		switch(ev.type) {
1161		case ConfigureRequest:
1162		case Expose:
1163		case MapRequest:
1164			handler[ev.type](&ev);
1165			break;
1166		case MotionNotify:
1167			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1168				continue;
1169			lasttime = ev.xmotion.time;
1170
1171			nx = ocx + (ev.xmotion.x - x);
1172			ny = ocy + (ev.xmotion.y - y);
1173			if (abs(selmon->wx - nx) < snap)
1174				nx = selmon->wx;
1175			else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1176				nx = selmon->wx + selmon->ww - WIDTH(c);
1177			if (abs(selmon->wy - ny) < snap)
1178				ny = selmon->wy;
1179			else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1180				ny = selmon->wy + selmon->wh - HEIGHT(c);
1181			if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1182			&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1183				togglefloating(NULL);
1184			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1185				resize(c, nx, ny, c->w, c->h, 1);
1186			break;
1187		}
1188	} while (ev.type != ButtonRelease);
1189	XUngrabPointer(dpy, CurrentTime);
1190	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1191		sendmon(c, m);
1192		selmon = m;
1193		focus(NULL);
1194	}
1195}
1196
1197Client *
1198nexttiled(Client *c)
1199{
1200	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1201	return c;
1202}
1203
1204void
1205pop(Client *c)
1206{
1207	detach(c);
1208	attach(c);
1209	focus(c);
1210	arrange(c->mon);
1211}
1212
1213void
1214propertynotify(XEvent *e)
1215{
1216	Client *c;
1217	Window trans;
1218	XPropertyEvent *ev = &e->xproperty;
1219
1220	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1221		updatestatus();
1222	else if (ev->state == PropertyDelete)
1223		return; /* ignore */
1224	else if ((c = wintoclient(ev->window))) {
1225		switch(ev->atom) {
1226		default: break;
1227		case XA_WM_TRANSIENT_FOR:
1228			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1229				(c->isfloating = (wintoclient(trans)) != NULL))
1230				arrange(c->mon);
1231			break;
1232		case XA_WM_NORMAL_HINTS:
1233			updatesizehints(c);
1234			break;
1235		case XA_WM_HINTS:
1236			updatewmhints(c);
1237			drawbars();
1238			break;
1239		}
1240		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1241			updatetitle(c);
1242			if (c == c->mon->sel)
1243				drawbar(c->mon);
1244		}
1245		if (ev->atom == netatom[NetWMWindowType])
1246			updatewindowtype(c);
1247	}
1248}
1249
1250void
1251quit(const Arg *arg)
1252{
1253	running = 0;
1254}
1255
1256Monitor *
1257recttomon(int x, int y, int w, int h)
1258{
1259	Monitor *m, *r = selmon;
1260	int a, area = 0;
1261
1262	for (m = mons; m; m = m->next)
1263		if ((a = INTERSECT(x, y, w, h, m)) > area) {
1264			area = a;
1265			r = m;
1266		}
1267	return r;
1268}
1269
1270void
1271resize(Client *c, int x, int y, int w, int h, int interact)
1272{
1273	if (applysizehints(c, &x, &y, &w, &h, interact))
1274		resizeclient(c, x, y, w, h);
1275}
1276
1277void
1278resizeclient(Client *c, int x, int y, int w, int h)
1279{
1280	XWindowChanges wc;
1281
1282	c->oldx = c->x; c->x = wc.x = x;
1283	c->oldy = c->y; c->y = wc.y = y;
1284	c->oldw = c->w; c->w = wc.width = w;
1285	c->oldh = c->h; c->h = wc.height = h;
1286	wc.border_width = c->bw;
1287	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1288	configure(c);
1289	XSync(dpy, False);
1290}
1291
1292void
1293resizemouse(const Arg *arg)
1294{
1295	int ocx, ocy, nw, nh;
1296	Client *c;
1297	Monitor *m;
1298	XEvent ev;
1299	Time lasttime = 0;
1300
1301	if (!(c = selmon->sel))
1302		return;
1303	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1304		return;
1305	restack(selmon);
1306	ocx = c->x;
1307	ocy = c->y;
1308	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1309		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1310		return;
1311	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1312	do {
1313		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1314		switch(ev.type) {
1315		case ConfigureRequest:
1316		case Expose:
1317		case MapRequest:
1318			handler[ev.type](&ev);
1319			break;
1320		case MotionNotify:
1321			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1322				continue;
1323			lasttime = ev.xmotion.time;
1324
1325			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1326			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1327			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1328			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1329			{
1330				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1331				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1332					togglefloating(NULL);
1333			}
1334			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1335				resize(c, c->x, c->y, nw, nh, 1);
1336			break;
1337		}
1338	} while (ev.type != ButtonRelease);
1339	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1340	XUngrabPointer(dpy, CurrentTime);
1341	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1342	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1343		sendmon(c, m);
1344		selmon = m;
1345		focus(NULL);
1346	}
1347}
1348
1349void
1350restack(Monitor *m)
1351{
1352	Client *c;
1353	XEvent ev;
1354	XWindowChanges wc;
1355
1356	drawbar(m);
1357	if (!m->sel)
1358		return;
1359	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1360		XRaiseWindow(dpy, m->sel->win);
1361	if (m->lt[m->sellt]->arrange) {
1362		wc.stack_mode = Below;
1363		wc.sibling = m->barwin;
1364		for (c = m->stack; c; c = c->snext)
1365			if (!c->isfloating && ISVISIBLE(c)) {
1366				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1367				wc.sibling = c->win;
1368			}
1369	}
1370	XSync(dpy, False);
1371	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1372}
1373
1374void
1375run(void)
1376{
1377	XEvent ev;
1378	/* main event loop */
1379	XSync(dpy, False);
1380	while (running && !XNextEvent(dpy, &ev))
1381		if (handler[ev.type])
1382			handler[ev.type](&ev); /* call handler */
1383}
1384
1385void
1386scan(void)
1387{
1388	unsigned int i, num;
1389	Window d1, d2, *wins = NULL;
1390	XWindowAttributes wa;
1391
1392	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1393		for (i = 0; i < num; i++) {
1394			if (!XGetWindowAttributes(dpy, wins[i], &wa)
1395			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1396				continue;
1397			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1398				manage(wins[i], &wa);
1399		}
1400		for (i = 0; i < num; i++) { /* now the transients */
1401			if (!XGetWindowAttributes(dpy, wins[i], &wa))
1402				continue;
1403			if (XGetTransientForHint(dpy, wins[i], &d1)
1404			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1405				manage(wins[i], &wa);
1406		}
1407		if (wins)
1408			XFree(wins);
1409	}
1410}
1411
1412void
1413sendmon(Client *c, Monitor *m)
1414{
1415	if (c->mon == m)
1416		return;
1417	unfocus(c, 1);
1418	detach(c);
1419	detachstack(c);
1420	c->mon = m;
1421	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1422	attach(c);
1423	attachstack(c);
1424	focus(NULL);
1425	arrange(NULL);
1426}
1427
1428void
1429setclientstate(Client *c, long state)
1430{
1431	long data[] = { state, None };
1432
1433	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1434		PropModeReplace, (unsigned char *)data, 2);
1435}
1436
1437int
1438sendevent(Client *c, Atom proto)
1439{
1440	int n;
1441	Atom *protocols;
1442	int exists = 0;
1443	XEvent ev;
1444
1445	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1446		while (!exists && n--)
1447			exists = protocols[n] == proto;
1448		XFree(protocols);
1449	}
1450	if (exists) {
1451		ev.type = ClientMessage;
1452		ev.xclient.window = c->win;
1453		ev.xclient.message_type = wmatom[WMProtocols];
1454		ev.xclient.format = 32;
1455		ev.xclient.data.l[0] = proto;
1456		ev.xclient.data.l[1] = CurrentTime;
1457		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1458	}
1459	return exists;
1460}
1461
1462void
1463setfocus(Client *c)
1464{
1465	if (!c->neverfocus) {
1466		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1467		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1468			XA_WINDOW, 32, PropModeReplace,
1469			(unsigned char *) &(c->win), 1);
1470	}
1471	sendevent(c, wmatom[WMTakeFocus]);
1472}
1473
1474void
1475setfullscreen(Client *c, int fullscreen)
1476{
1477	if (fullscreen && !c->isfullscreen) {
1478		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1479			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1480		c->isfullscreen = 1;
1481		c->oldstate = c->isfloating;
1482		c->oldbw = c->bw;
1483		c->bw = 0;
1484		c->isfloating = 1;
1485		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1486		XRaiseWindow(dpy, c->win);
1487	} else if (!fullscreen && c->isfullscreen){
1488		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1489			PropModeReplace, (unsigned char*)0, 0);
1490		c->isfullscreen = 0;
1491		c->isfloating = c->oldstate;
1492		c->bw = c->oldbw;
1493		c->x = c->oldx;
1494		c->y = c->oldy;
1495		c->w = c->oldw;
1496		c->h = c->oldh;
1497		resizeclient(c, c->x, c->y, c->w, c->h);
1498		arrange(c->mon);
1499	}
1500}
1501
1502void
1503setlayout(const Arg *arg)
1504{
1505	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1506		selmon->sellt ^= 1;
1507	if (arg && arg->v)
1508		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1509	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1510	if (selmon->sel)
1511		arrange(selmon);
1512	else
1513		drawbar(selmon);
1514}
1515
1516/* arg > 1.0 will set mfact absolutely */
1517void
1518setmfact(const Arg *arg)
1519{
1520	float f;
1521
1522	if (!arg || !selmon->lt[selmon->sellt]->arrange)
1523		return;
1524	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1525	if (f < 0.1 || f > 0.9)
1526		return;
1527	selmon->mfact = f;
1528	arrange(selmon);
1529}
1530
1531void
1532setup(void)
1533{
1534	int i;
1535	XSetWindowAttributes wa;
1536	Atom utf8string;
1537
1538	/* clean up any zombies immediately */
1539	sigchld(0);
1540
1541	/* init screen */
1542	screen = DefaultScreen(dpy);
1543	sw = DisplayWidth(dpy, screen);
1544	sh = DisplayHeight(dpy, screen);
1545	root = RootWindow(dpy, screen);
1546	drw = drw_create(dpy, screen, root, sw, sh);
1547	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1548		die("no fonts could be loaded.");
1549	lrpad = drw->fonts->h;
1550	bh = drw->fonts->h + 2;
1551	updategeom();
1552	/* init atoms */
1553	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1554	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1555	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1556	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1557	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1558	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1559	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1560	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1561	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1562	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1563	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1564	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1565	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1566	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1567	/* init cursors */
1568	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1569	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1570	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1571	/* init appearance */
1572	scheme = ecalloc(LENGTH(colors), sizeof(Scm));
1573	for (i = 0; i < LENGTH(colors); i++)
1574		scheme[i] = drw_scm_create(drw, colors[i], 3);
1575	/* init bars */
1576	updatebars();
1577	updatestatus();
1578	/* supporting window for NetWMCheck */
1579	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1580	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1581		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1582	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1583		PropModeReplace, (unsigned char *) "dwm", 4);
1584	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1585		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1586	/* EWMH support per view */
1587	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1588		PropModeReplace, (unsigned char *) netatom, NetLast);
1589	XDeleteProperty(dpy, root, netatom[NetClientList]);
1590	/* select events */
1591	wa.cursor = cursor[CurNormal]->cursor;
1592	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1593		|ButtonPressMask|PointerMotionMask|EnterWindowMask
1594		|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1595	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1596	XSelectInput(dpy, root, wa.event_mask);
1597	grabkeys();
1598	focus(NULL);
1599}
1600
1601
1602void
1603seturgent(Client *c, int urg)
1604{
1605	XWMHints *wmh;
1606
1607	c->isurgent = urg;
1608	if (!(wmh = XGetWMHints(dpy, c->win)))
1609		return;
1610	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1611	XSetWMHints(dpy, c->win, wmh);
1612	XFree(wmh);
1613}
1614
1615void
1616showhide(Client *c)
1617{
1618	if (!c)
1619		return;
1620	if (ISVISIBLE(c)) {
1621		/* show clients top down */
1622		XMoveWindow(dpy, c->win, c->x, c->y);
1623		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1624			resize(c, c->x, c->y, c->w, c->h, 0);
1625		showhide(c->snext);
1626	} else {
1627		/* hide clients bottom up */
1628		showhide(c->snext);
1629		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1630	}
1631}
1632
1633void
1634sigchld(int unused)
1635{
1636	if (signal(SIGCHLD, sigchld) == SIG_ERR)
1637		die("can't install SIGCHLD handler:");
1638	while (0 < waitpid(-1, NULL, WNOHANG));
1639}
1640
1641void
1642spawn(const Arg *arg)
1643{
1644	if (arg->v == dmenucmd)
1645		dmenumon[0] = '0' + selmon->num;
1646	if (fork() == 0) {
1647		if (dpy)
1648			close(ConnectionNumber(dpy));
1649		setsid();
1650		execvp(((char **)arg->v)[0], (char **)arg->v);
1651		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1652		perror(" failed");
1653		exit(EXIT_SUCCESS);
1654	}
1655}
1656
1657void
1658tag(const Arg *arg)
1659{
1660	if (selmon->sel && arg->ui & TAGMASK) {
1661		selmon->sel->tags = arg->ui & TAGMASK;
1662		focus(NULL);
1663		arrange(selmon);
1664	}
1665}
1666
1667void
1668tagmon(const Arg *arg)
1669{
1670	if (!selmon->sel || !mons->next)
1671		return;
1672	sendmon(selmon->sel, dirtomon(arg->i));
1673}
1674
1675void
1676tile(Monitor *m)
1677{
1678	unsigned int i, n, h, mw, my, ty;
1679	Client *c;
1680
1681	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1682	if (n == 0)
1683		return;
1684
1685	if (n > m->nmaster)
1686		mw = m->nmaster ? m->ww * m->mfact : 0;
1687	else
1688		mw = m->ww;
1689	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1690		if (i < m->nmaster) {
1691			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1692			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1693			my += HEIGHT(c);
1694		} else {
1695			h = (m->wh - ty) / (n - i);
1696			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1697			ty += HEIGHT(c);
1698		}
1699}
1700
1701void
1702togglebar(const Arg *arg)
1703{
1704	selmon->showbar = !selmon->showbar;
1705	updatebarpos(selmon);
1706	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1707	arrange(selmon);
1708}
1709
1710void
1711togglefloating(const Arg *arg)
1712{
1713	if (!selmon->sel)
1714		return;
1715	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1716		return;
1717	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1718	if (selmon->sel->isfloating)
1719		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1720			selmon->sel->w, selmon->sel->h, 0);
1721	arrange(selmon);
1722}
1723
1724void
1725toggletag(const Arg *arg)
1726{
1727	unsigned int newtags;
1728
1729	if (!selmon->sel)
1730		return;
1731	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1732	if (newtags) {
1733		selmon->sel->tags = newtags;
1734		focus(NULL);
1735		arrange(selmon);
1736	}
1737}
1738
1739void
1740toggleview(const Arg *arg)
1741{
1742	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1743
1744	if (newtagset) {
1745		selmon->tagset[selmon->seltags] = newtagset;
1746		focus(NULL);
1747		arrange(selmon);
1748	}
1749}
1750
1751void
1752unfocus(Client *c, int setfocus)
1753{
1754	if (!c)
1755		return;
1756	grabbuttons(c, 0);
1757	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1758	if (setfocus) {
1759		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1760		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1761	}
1762}
1763
1764void
1765unmanage(Client *c, int destroyed)
1766{
1767	Monitor *m = c->mon;
1768	XWindowChanges wc;
1769
1770	detach(c);
1771	detachstack(c);
1772	if (!destroyed) {
1773		wc.border_width = c->oldbw;
1774		XGrabServer(dpy); /* avoid race conditions */
1775		XSetErrorHandler(xerrordummy);
1776		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1777		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1778		setclientstate(c, WithdrawnState);
1779		XSync(dpy, False);
1780		XSetErrorHandler(xerror);
1781		XUngrabServer(dpy);
1782	}
1783	free(c);
1784	focus(NULL);
1785	updateclientlist();
1786	arrange(m);
1787}
1788
1789void
1790unmapnotify(XEvent *e)
1791{
1792	Client *c;
1793	XUnmapEvent *ev = &e->xunmap;
1794
1795	if ((c = wintoclient(ev->window))) {
1796		if (ev->send_event)
1797			setclientstate(c, WithdrawnState);
1798		else
1799			unmanage(c, 0);
1800	}
1801}
1802
1803void
1804updatebars(void)
1805{
1806	Monitor *m;
1807	XSetWindowAttributes wa = {
1808		.override_redirect = True,
1809		.background_pixmap = ParentRelative,
1810		.event_mask = ButtonPressMask|ExposureMask
1811	};
1812	for (m = mons; m; m = m->next) {
1813		if (m->barwin)
1814			continue;
1815		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1816				CopyFromParent, DefaultVisual(dpy, screen),
1817				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1818		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1819		XMapRaised(dpy, m->barwin);
1820	}
1821}
1822
1823void
1824updatebarpos(Monitor *m)
1825{
1826	m->wy = m->my;
1827	m->wh = m->mh;
1828	if (m->showbar) {
1829		m->wh -= bh;
1830		m->by = m->topbar ? m->wy : m->wy + m->wh;
1831		m->wy = m->topbar ? m->wy + bh : m->wy;
1832	} else
1833		m->by = -bh;
1834}
1835
1836void
1837updateclientlist()
1838{
1839	Client *c;
1840	Monitor *m;
1841
1842	XDeleteProperty(dpy, root, netatom[NetClientList]);
1843	for (m = mons; m; m = m->next)
1844		for (c = m->clients; c; c = c->next)
1845			XChangeProperty(dpy, root, netatom[NetClientList],
1846				XA_WINDOW, 32, PropModeAppend,
1847				(unsigned char *) &(c->win), 1);
1848}
1849
1850int
1851updategeom(void)
1852{
1853	int dirty = 0;
1854
1855#ifdef XINERAMA
1856	if (XineramaIsActive(dpy)) {
1857		int i, j, n, nn;
1858		Client *c;
1859		Monitor *m;
1860		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1861		XineramaScreenInfo *unique = NULL;
1862
1863		for (n = 0, m = mons; m; m = m->next, n++);
1864		/* only consider unique geometries as separate screens */
1865		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1866		for (i = 0, j = 0; i < nn; i++)
1867			if (isuniquegeom(unique, j, &info[i]))
1868				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1869		XFree(info);
1870		nn = j;
1871		if (n <= nn) { /* new monitors available */
1872			for (i = 0; i < (nn - n); i++) {
1873				for (m = mons; m && m->next; m = m->next);
1874				if (m)
1875					m->next = createmon();
1876				else
1877					mons = createmon();
1878			}
1879			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1880				if (i >= n
1881				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
1882				|| unique[i].width != m->mw || unique[i].height != m->mh)
1883				{
1884					dirty = 1;
1885					m->num = i;
1886					m->mx = m->wx = unique[i].x_org;
1887					m->my = m->wy = unique[i].y_org;
1888					m->mw = m->ww = unique[i].width;
1889					m->mh = m->wh = unique[i].height;
1890					updatebarpos(m);
1891				}
1892		} else { /* less monitors available nn < n */
1893			for (i = nn; i < n; i++) {
1894				for (m = mons; m && m->next; m = m->next);
1895				while ((c = m->clients)) {
1896					dirty = 1;
1897					m->clients = c->next;
1898					detachstack(c);
1899					c->mon = mons;
1900					attach(c);
1901					attachstack(c);
1902				}
1903				if (m == selmon)
1904					selmon = mons;
1905				cleanupmon(m);
1906			}
1907		}
1908		free(unique);
1909	} else
1910#endif /* XINERAMA */
1911	{ /* default monitor setup */
1912		if (!mons)
1913			mons = createmon();
1914		if (mons->mw != sw || mons->mh != sh) {
1915			dirty = 1;
1916			mons->mw = mons->ww = sw;
1917			mons->mh = mons->wh = sh;
1918			updatebarpos(mons);
1919		}
1920	}
1921	if (dirty) {
1922		selmon = mons;
1923		selmon = wintomon(root);
1924	}
1925	return dirty;
1926}
1927
1928void
1929updatenumlockmask(void)
1930{
1931	unsigned int i, j;
1932	XModifierKeymap *modmap;
1933
1934	numlockmask = 0;
1935	modmap = XGetModifierMapping(dpy);
1936	for (i = 0; i < 8; i++)
1937		for (j = 0; j < modmap->max_keypermod; j++)
1938			if (modmap->modifiermap[i * modmap->max_keypermod + j]
1939				== XKeysymToKeycode(dpy, XK_Num_Lock))
1940				numlockmask = (1 << i);
1941	XFreeModifiermap(modmap);
1942}
1943
1944void
1945updatesizehints(Client *c)
1946{
1947	long msize;
1948	XSizeHints size;
1949
1950	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1951		/* size is uninitialized, ensure that size.flags aren't used */
1952		size.flags = PSize;
1953	if (size.flags & PBaseSize) {
1954		c->basew = size.base_width;
1955		c->baseh = size.base_height;
1956	} else if (size.flags & PMinSize) {
1957		c->basew = size.min_width;
1958		c->baseh = size.min_height;
1959	} else
1960		c->basew = c->baseh = 0;
1961	if (size.flags & PResizeInc) {
1962		c->incw = size.width_inc;
1963		c->inch = size.height_inc;
1964	} else
1965		c->incw = c->inch = 0;
1966	if (size.flags & PMaxSize) {
1967		c->maxw = size.max_width;
1968		c->maxh = size.max_height;
1969	} else
1970		c->maxw = c->maxh = 0;
1971	if (size.flags & PMinSize) {
1972		c->minw = size.min_width;
1973		c->minh = size.min_height;
1974	} else if (size.flags & PBaseSize) {
1975		c->minw = size.base_width;
1976		c->minh = size.base_height;
1977	} else
1978		c->minw = c->minh = 0;
1979	if (size.flags & PAspect) {
1980		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1981		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1982	} else
1983		c->maxa = c->mina = 0.0;
1984	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
1985}
1986
1987void
1988updatetitle(Client *c)
1989{
1990	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1991		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1992	if (c->name[0] == '\0') /* hack to mark broken clients */
1993		strcpy(c->name, broken);
1994}
1995
1996void
1997updatestatus(void)
1998{
1999	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2000		strcpy(stext, "dwm-"VERSION);
2001	drawbar(selmon);
2002}
2003
2004void
2005updatewindowtype(Client *c)
2006{
2007	Atom state = getatomprop(c, netatom[NetWMState]);
2008	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2009
2010	if (state == netatom[NetWMFullscreen])
2011		setfullscreen(c, 1);
2012	if (wtype == netatom[NetWMWindowTypeDialog])
2013		c->isfloating = 1;
2014}
2015
2016void
2017updatewmhints(Client *c)
2018{
2019	XWMHints *wmh;
2020
2021	if ((wmh = XGetWMHints(dpy, c->win))) {
2022		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2023			wmh->flags &= ~XUrgencyHint;
2024			XSetWMHints(dpy, c->win, wmh);
2025		} else
2026			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2027		if (wmh->flags & InputHint)
2028			c->neverfocus = !wmh->input;
2029		else
2030			c->neverfocus = 0;
2031		XFree(wmh);
2032	}
2033}
2034
2035void
2036view(const Arg *arg)
2037{
2038	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2039		return;
2040	selmon->seltags ^= 1; /* toggle sel tagset */
2041	if (arg->ui & TAGMASK)
2042		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2043	focus(NULL);
2044	arrange(selmon);
2045}
2046
2047Client *
2048wintoclient(Window w)
2049{
2050	Client *c;
2051	Monitor *m;
2052
2053	for (m = mons; m; m = m->next)
2054		for (c = m->clients; c; c = c->next)
2055			if (c->win == w)
2056				return c;
2057	return NULL;
2058}
2059
2060Monitor *
2061wintomon(Window w)
2062{
2063	int x, y;
2064	Client *c;
2065	Monitor *m;
2066
2067	if (w == root && getrootptr(&x, &y))
2068		return recttomon(x, y, 1, 1);
2069	for (m = mons; m; m = m->next)
2070		if (w == m->barwin)
2071			return m;
2072	if ((c = wintoclient(w)))
2073		return c->mon;
2074	return selmon;
2075}
2076
2077/* There's no way to check accesses to destroyed windows, thus those cases are
2078 * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2079 * default error handler, which may call exit. */
2080int
2081xerror(Display *dpy, XErrorEvent *ee)
2082{
2083	if (ee->error_code == BadWindow
2084	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2085	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2086	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2087	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2088	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2089	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2090	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2091	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2092		return 0;
2093	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2094		ee->request_code, ee->error_code);
2095	return xerrorxlib(dpy, ee); /* may call exit */
2096}
2097
2098int
2099xerrordummy(Display *dpy, XErrorEvent *ee)
2100{
2101	return 0;
2102}
2103
2104/* Startup Error handler to check if another window manager
2105 * is already running. */
2106int
2107xerrorstart(Display *dpy, XErrorEvent *ee)
2108{
2109	die("dwm: another window manager is already running");
2110	return -1;
2111}
2112
2113void
2114zoom(const Arg *arg)
2115{
2116	Client *c = selmon->sel;
2117
2118	if (!selmon->lt[selmon->sellt]->arrange
2119	|| (selmon->sel && selmon->sel->isfloating))
2120		return;
2121	if (c == nexttiled(selmon->clients))
2122		if (!c || !(c = nexttiled(c->next)))
2123			return;
2124	pop(c);
2125}
2126
2127int
2128main(int argc, char *argv[])
2129{
2130	if (argc == 2 && !strcmp("-v", argv[1]))
2131		die("dwm-"VERSION);
2132	else if (argc != 1)
2133		die("usage: dwm [-v]");
2134	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2135		fputs("warning: no locale support\n", stderr);
2136	if (!(dpy = XOpenDisplay(NULL)))
2137		die("dwm: cannot open display");
2138	checkotherwm();
2139	setup();
2140	scan();
2141	run();
2142	cleanup();
2143	XCloseDisplay(dpy);
2144	return EXIT_SUCCESS;
2145}