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