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