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(c && c == selmon->sel) {
 819		D fprintf(stderr, "focus, optimising focus away\n");
 820		return;
 821	}
 822	if(selmon->sel)
 823		unfocus(selmon->sel);
 824	if(c) {
 825		if(c->mon != selmon)
 826			selmon = c->mon;
 827		if(c->isurgent)
 828			clearurgent(c);
 829		detachstack(c);
 830		attachstack(c);
 831		grabbuttons(c, True);
 832		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 833		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 834	}
 835	else
 836		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 837	selmon->sel = c;
 838	drawbars();
 839}
 840
 841void
 842focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 843	XFocusChangeEvent *ev = &e->xfocus;
 844
 845	if(selmon->sel && ev->window != selmon->sel->win)
 846		XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 847}
 848
 849void
 850focusmon(const Arg *arg) {
 851	Monitor *m = NULL;
 852
 853	if(!mons->next)
 854		return;
 855	if((m = dirtomon(arg->i)) == selmon)
 856		return;
 857	unfocus(selmon->sel);
 858	selmon = m;
 859	focus(NULL);
 860}
 861
 862void
 863focusstack(const Arg *arg) {
 864	Client *c = NULL, *i;
 865
 866	if(!selmon->sel)
 867		return;
 868	if(arg->i > 0) {
 869		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 870		if(!c)
 871			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 872	}
 873	else {
 874		for(i = selmon->clients; i != selmon->sel; i = i->next)
 875			if(ISVISIBLE(i))
 876				c = i;
 877		if(!c)
 878			for(; i; i = i->next)
 879				if(ISVISIBLE(i))
 880					c = i;
 881	}
 882	if(c) {
 883		focus(c);
 884		restack(selmon);
 885	}
 886}
 887
 888unsigned long
 889getcolor(const char *colstr) {
 890	Colormap cmap = DefaultColormap(dpy, screen);
 891	XColor color;
 892
 893	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 894		die("error, cannot allocate color '%s'\n", colstr);
 895	return color.pixel;
 896}
 897
 898Bool
 899getrootptr(int *x, int *y) {
 900	int di;
 901	unsigned int dui;
 902	Window dummy;
 903
 904	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 905}
 906
 907long
 908getstate(Window w) {
 909	int format, status;
 910	long result = -1;
 911	unsigned char *p = NULL;
 912	unsigned long n, extra;
 913	Atom real;
 914
 915	status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 916	                            &real, &format, &n, &extra, (unsigned char **)&p);
 917	if(status != Success)
 918		return -1;
 919	if(n != 0)
 920		result = *p;
 921	XFree(p);
 922	return result;
 923}
 924
 925Bool
 926gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 927	char **list = NULL;
 928	int n;
 929	XTextProperty name;
 930
 931	if(!text || size == 0)
 932		return False;
 933	text[0] = '\0';
 934	XGetTextProperty(dpy, w, &name, atom);
 935	if(!name.nitems)
 936		return False;
 937	if(name.encoding == XA_STRING)
 938		strncpy(text, (char *)name.value, size - 1);
 939	else {
 940		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 941			strncpy(text, *list, size - 1);
 942			XFreeStringList(list);
 943		}
 944	}
 945	text[size - 1] = '\0';
 946	XFree(name.value);
 947	return True;
 948}
 949
 950void
 951grabbuttons(Client *c, Bool focused) {
 952	updatenumlockmask();
 953	{
 954		unsigned int i, j;
 955		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 956		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 957		if(focused) {
 958			for(i = 0; i < LENGTH(buttons); i++)
 959				if(buttons[i].click == ClkClientWin)
 960					for(j = 0; j < LENGTH(modifiers); j++)
 961						XGrabButton(dpy, buttons[i].button,
 962						            buttons[i].mask | modifiers[j],
 963						            c->win, False, BUTTONMASK,
 964						            GrabModeAsync, GrabModeSync, None, None);
 965		}
 966		else
 967			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 968			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 969	}
 970}
 971
 972void
 973grabkeys(void) {
 974	updatenumlockmask();
 975	{
 976		unsigned int i, j;
 977		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 978		KeyCode code;
 979
 980		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 981		for(i = 0; i < LENGTH(keys); i++) {
 982			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 983				for(j = 0; j < LENGTH(modifiers); j++)
 984					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 985						 True, GrabModeAsync, GrabModeAsync);
 986		}
 987	}
 988}
 989
 990void
 991initfont(const char *fontstr) {
 992	char *def, **missing;
 993	int i, n;
 994
 995	missing = NULL;
 996	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 997	if(missing) {
 998		while(n--)
 999			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1000		XFreeStringList(missing);
1001	}
1002	if(dc.font.set) {
1003		XFontSetExtents *font_extents;
1004		XFontStruct **xfonts;
1005		char **font_names;
1006
1007		dc.font.ascent = dc.font.descent = 0;
1008		font_extents = XExtentsOfFontSet(dc.font.set);
1009		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1010		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
1011			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1012			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1013			xfonts++;
1014		}
1015	}
1016	else {
1017		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1018		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1019			die("error, cannot load font: '%s'\n", fontstr);
1020		dc.font.ascent = dc.font.xfont->ascent;
1021		dc.font.descent = dc.font.xfont->descent;
1022	}
1023	dc.font.height = dc.font.ascent + dc.font.descent;
1024}
1025
1026Bool
1027isprotodel(Client *c) {
1028	int i, n;
1029	Atom *protocols;
1030	Bool ret = False;
1031
1032	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1033		for(i = 0; !ret && i < n; i++)
1034			if(protocols[i] == wmatom[WMDelete])
1035				ret = True;
1036		XFree(protocols);
1037	}
1038	return ret;
1039}
1040
1041#ifdef XINERAMA
1042static Bool
1043isuniquegeom(XineramaScreenInfo *unique, size_t len, XineramaScreenInfo *info) {
1044	unsigned int i;
1045
1046	for(i = 0; i < len; i++)
1047		if(unique[i].x_org == info->x_org && unique[i].y_org == info->y_org
1048		&& unique[i].width == info->width && unique[i].height == info->height)
1049			return False;
1050	return True;
1051}
1052#endif /* XINERAMA */
1053
1054void
1055keypress(XEvent *e) {
1056	unsigned int i;
1057	KeySym keysym;
1058	XKeyEvent *ev;
1059
1060	ev = &e->xkey;
1061	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1062	for(i = 0; i < LENGTH(keys); i++)
1063		if(keysym == keys[i].keysym
1064		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1065		&& keys[i].func)
1066			keys[i].func(&(keys[i].arg));
1067}
1068
1069void
1070killclient(const Arg *arg) {
1071	XEvent ev;
1072
1073	if(!selmon->sel)
1074		return;
1075	if(isprotodel(selmon->sel)) {
1076		ev.type = ClientMessage;
1077		ev.xclient.window = selmon->sel->win;
1078		ev.xclient.message_type = wmatom[WMProtocols];
1079		ev.xclient.format = 32;
1080		ev.xclient.data.l[0] = wmatom[WMDelete];
1081		ev.xclient.data.l[1] = CurrentTime;
1082		XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1083	}
1084	else {
1085		XGrabServer(dpy);
1086		XSetErrorHandler(xerrordummy);
1087		XSetCloseDownMode(dpy, DestroyAll);
1088		XKillClient(dpy, selmon->sel->win);
1089		XSync(dpy, False);
1090		XSetErrorHandler(xerror);
1091		XUngrabServer(dpy);
1092	}
1093}
1094
1095void
1096manage(Window w, XWindowAttributes *wa) {
1097	static Client cz;
1098	Client *c, *t = NULL;
1099	Window trans = None;
1100	XWindowChanges wc;
1101
1102	if(!(c = malloc(sizeof(Client))))
1103		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1104	*c = cz;
1105	c->win = w;
1106	updatetitle(c);
1107	if(XGetTransientForHint(dpy, w, &trans))
1108		t = wintoclient(trans);
1109	if(t) {
1110		c->mon = t->mon;
1111		c->tags = t->tags;
1112	}
1113	else {
1114		c->mon = selmon;
1115		applyrules(c);
1116	}
1117	/* geometry */
1118	c->x = wa->x + c->mon->wx;
1119	c->y = wa->y + c->mon->wy;
1120	c->w = wa->width;
1121	c->h = wa->height;
1122	c->oldbw = wa->border_width;
1123	if(c->w == c->mon->mw && c->h == c->mon->mh) {
1124		c->x = c->mon->mx;
1125		c->y = c->mon->my;
1126		c->bw = 0;
1127	}
1128	else {
1129		if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1130			c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1131		if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1132			c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1133		c->x = MAX(c->x, c->mon->mx);
1134		/* only fix client y-offset, if the client center might cover the bar */
1135		c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1136		           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1137		c->bw = borderpx;
1138	}
1139	wc.border_width = c->bw;
1140	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1141	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1142	configure(c); /* propagates border_width, if size doesn't change */
1143	updatesizehints(c);
1144	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1145	grabbuttons(c, False);
1146	if(!c->isfloating)
1147		c->isfloating = trans != None || c->isfixed;
1148	if(c->isfloating)
1149		XRaiseWindow(dpy, c->win);
1150	attach(c);
1151	attachstack(c);
1152	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1153	XMapWindow(dpy, c->win);
1154	setclientstate(c, NormalState);
1155	arrange(c->mon);
1156}
1157
1158void
1159mappingnotify(XEvent *e) {
1160	XMappingEvent *ev = &e->xmapping;
1161
1162	XRefreshKeyboardMapping(ev);
1163	if(ev->request == MappingKeyboard)
1164		grabkeys();
1165}
1166
1167void
1168maprequest(XEvent *e) {
1169	static XWindowAttributes wa;
1170	XMapRequestEvent *ev = &e->xmaprequest;
1171
1172	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1173		return;
1174	if(wa.override_redirect)
1175		return;
1176	if(!wintoclient(ev->window))
1177		manage(ev->window, &wa);
1178}
1179
1180void
1181monocle(Monitor *m) {
1182	unsigned int n = 0;
1183	Client *c;
1184
1185	for(c = m->clients; c; c = c->next)
1186		if(ISVISIBLE(c))
1187			n++;
1188	if(n > 0) /* override layout symbol */
1189		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1190	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1191		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1192}
1193
1194void
1195movemouse(const Arg *arg) {
1196	int x, y, ocx, ocy, nx, ny;
1197	Client *c;
1198	Monitor *m;
1199	XEvent ev;
1200
1201	if(!(c = selmon->sel))
1202		return;
1203	restack(selmon);
1204	ocx = c->x;
1205	ocy = c->y;
1206	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1207	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1208		return;
1209	if(!getrootptr(&x, &y))
1210		return;
1211	do {
1212		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1213		switch (ev.type) {
1214		case ConfigureRequest:
1215		case Expose:
1216		case MapRequest:
1217			handler[ev.type](&ev);
1218			break;
1219		case MotionNotify:
1220			nx = ocx + (ev.xmotion.x - x);
1221			ny = ocy + (ev.xmotion.y - y);
1222			if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1223			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1224				if(abs(selmon->wx - nx) < snap)
1225					nx = selmon->wx;
1226				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1227					nx = selmon->wx + selmon->ww - WIDTH(c);
1228				if(abs(selmon->wy - ny) < snap)
1229					ny = selmon->wy;
1230				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1231					ny = selmon->wy + selmon->wh - HEIGHT(c);
1232				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1233				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1234					togglefloating(NULL);
1235			}
1236			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1237				resize(c, nx, ny, c->w, c->h, True);
1238			break;
1239		}
1240	} while(ev.type != ButtonRelease);
1241	XUngrabPointer(dpy, CurrentTime);
1242	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1243		sendmon(c, m);
1244		selmon = m;
1245		focus(NULL);
1246	}
1247}
1248
1249Client *
1250nexttiled(Client *c) {
1251	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1252	return c;
1253}
1254
1255Monitor *
1256ptrtomon(int x, int y) {
1257	Monitor *m;
1258
1259	for(m = mons; m; m = m->next)
1260		if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1261			return m;
1262	return selmon;
1263}
1264
1265void
1266propertynotify(XEvent *e) {
1267	Client *c;
1268	Window trans;
1269	XPropertyEvent *ev = &e->xproperty;
1270
1271	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1272		updatestatus();
1273	else if(ev->state == PropertyDelete)
1274		return; /* ignore */
1275	else if((c = wintoclient(ev->window))) {
1276		switch (ev->atom) {
1277		default: break;
1278		case XA_WM_TRANSIENT_FOR:
1279			XGetTransientForHint(dpy, c->win, &trans);
1280			if(!c->isfloating && (c->isfloating = (wintoclient(trans) != NULL)))
1281				arrange(c->mon);
1282			break;
1283		case XA_WM_NORMAL_HINTS:
1284			updatesizehints(c);
1285			break;
1286		case XA_WM_HINTS:
1287			updatewmhints(c);
1288			drawbars();
1289			break;
1290		}
1291		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1292			updatetitle(c);
1293			if(c == c->mon->sel)
1294				drawbar(c->mon);
1295		}
1296	}
1297}
1298
1299void
1300quit(const Arg *arg) {
1301	running = False;
1302}
1303
1304void
1305resize(Client *c, int x, int y, int w, int h, Bool interact) {
1306	XWindowChanges wc;
1307
1308	if(applysizehints(c, &x, &y, &w, &h, interact)) {
1309		c->x = wc.x = x;
1310		c->y = wc.y = y;
1311		c->w = wc.width = w;
1312		c->h = wc.height = h;
1313		wc.border_width = c->bw;
1314		XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1315		configure(c);
1316		XSync(dpy, False);
1317	}
1318}
1319
1320void
1321resizemouse(const Arg *arg) {
1322	int ocx, ocy;
1323	int nw, nh;
1324	Client *c;
1325	Monitor *m;
1326	XEvent ev;
1327
1328	if(!(c = selmon->sel))
1329		return;
1330	restack(selmon);
1331	ocx = c->x;
1332	ocy = c->y;
1333	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1334	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1335		return;
1336	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1337	do {
1338		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1339		switch(ev.type) {
1340		case ConfigureRequest:
1341		case Expose:
1342		case MapRequest:
1343			handler[ev.type](&ev);
1344			break;
1345		case MotionNotify:
1346			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1347			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1348			if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1349			&& nh >= selmon->wy && nh <= selmon->wy + selmon->wh)
1350			{
1351				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1352				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1353					togglefloating(NULL);
1354			}
1355			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1356				resize(c, c->x, c->y, nw, nh, True);
1357			break;
1358		}
1359	} while(ev.type != ButtonRelease);
1360	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1361	XUngrabPointer(dpy, CurrentTime);
1362	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1363	if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1364		sendmon(c, m);
1365		selmon = m;
1366		focus(NULL);
1367	}
1368}
1369
1370void
1371restack(Monitor *m) {
1372	Client *c;
1373	XEvent ev;
1374	XWindowChanges wc;
1375
1376	drawbar(m);
1377	if(!m->sel)
1378		return;
1379	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1380		XRaiseWindow(dpy, m->sel->win);
1381	if(m->lt[m->sellt]->arrange) {
1382		wc.stack_mode = Below;
1383		wc.sibling = m->barwin;
1384		for(c = m->stack; c; c = c->snext)
1385			if(!c->isfloating && ISVISIBLE(c)) {
1386				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1387				wc.sibling = c->win;
1388			}
1389	}
1390	XSync(dpy, False);
1391	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1392}
1393
1394void
1395run(void) {
1396	XEvent ev;
1397	static const char *evname[LASTEvent] = {
1398		[ButtonPress] = "buttonpress",
1399		[ConfigureRequest] = "configurerequest",
1400		[ConfigureNotify] = "configurenotify",
1401		[DestroyNotify] = "destroynotify",
1402		[EnterNotify] = "enternotify",
1403		[Expose] = "expose",
1404		[FocusIn] = "focusin",
1405		[KeyPress] = "keypress",
1406		[MappingNotify] = "mappingnotify",
1407		[MapRequest] = "maprequest",
1408		[PropertyNotify] = "propertynotify",
1409		[UnmapNotify] = "unmapnotify"
1410	};
1411	/* main event loop */
1412	XSync(dpy, False);
1413	while(running && !XNextEvent(dpy, &ev)) {
1414		D fprintf(stderr, "run event %s %ld\n", evname[ev.type], ev.xany.window);
1415		if(handler[ev.type])
1416			handler[ev.type](&ev); /* call handler */
1417	}
1418}
1419
1420void
1421scan(void) {
1422	unsigned int i, num;
1423	Window d1, d2, *wins = NULL;
1424	XWindowAttributes wa;
1425
1426	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1427		for(i = 0; i < num; i++) {
1428			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1429			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1430				continue;
1431			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1432				manage(wins[i], &wa);
1433		}
1434		for(i = 0; i < num; i++) { /* now the transients */
1435			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1436				continue;
1437			if(XGetTransientForHint(dpy, wins[i], &d1)
1438			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1439				manage(wins[i], &wa);
1440		}
1441		if(wins)
1442			XFree(wins);
1443	}
1444}
1445
1446void
1447sendmon(Client *c, Monitor *m) {
1448	if(c->mon == m)
1449		return;
1450	unfocus(c);
1451	detach(c);
1452	detachstack(c);
1453	c->mon = m;
1454	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1455	attach(c);
1456	attachstack(c);
1457	focus(NULL);
1458	arrange(NULL);
1459}
1460
1461void
1462setclientstate(Client *c, long state) {
1463	long data[] = { state, None };
1464
1465	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1466			PropModeReplace, (unsigned char *)data, 2);
1467}
1468
1469void
1470setlayout(const Arg *arg) {
1471	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1472		selmon->sellt ^= 1;
1473	if(arg && arg->v)
1474		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1475	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1476	if(selmon->sel)
1477		arrange(selmon);
1478	else
1479		drawbar(selmon);
1480}
1481
1482/* arg > 1.0 will set mfact absolutly */
1483void
1484setmfact(const Arg *arg) {
1485	float f;
1486
1487	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1488		return;
1489	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1490	if(f < 0.1 || f > 0.9)
1491		return;
1492	selmon->mfact = f;
1493	arrange(selmon);
1494}
1495
1496void
1497setup(void) {
1498	XSetWindowAttributes wa;
1499
1500	/* clean up any zombies immediately */
1501	sigchld(0);
1502
1503	/* init screen */
1504	screen = DefaultScreen(dpy);
1505	root = RootWindow(dpy, screen);
1506	initfont(font);
1507	sw = DisplayWidth(dpy, screen);
1508	sh = DisplayHeight(dpy, screen);
1509	bh = dc.h = dc.font.height + 2;
1510	updategeom();
1511	/* init atoms */
1512	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1513	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1514	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1515	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1516	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1517	/* init cursors */
1518	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1519	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1520	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1521	/* init appearance */
1522	dc.norm[ColBorder] = getcolor(normbordercolor);
1523	dc.norm[ColBG] = getcolor(normbgcolor);
1524	dc.norm[ColFG] = getcolor(normfgcolor);
1525	dc.sel[ColBorder] = getcolor(selbordercolor);
1526	dc.sel[ColBG] = getcolor(selbgcolor);
1527	dc.sel[ColFG] = getcolor(selfgcolor);
1528	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1529	dc.gc = XCreateGC(dpy, root, 0, NULL);
1530	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1531	if(!dc.font.set)
1532		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1533	/* init bars */
1534	updatebars();
1535	updatestatus();
1536	/* EWMH support per view */
1537	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1538			PropModeReplace, (unsigned char *) netatom, NetLast);
1539	/* select for events */
1540	wa.cursor = cursor[CurNormal];
1541	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1542	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1543	                |PropertyChangeMask;
1544	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1545	XSelectInput(dpy, root, wa.event_mask);
1546	grabkeys();
1547}
1548
1549void
1550showhide(Client *c) {
1551	if(!c)
1552		return;
1553	if(ISVISIBLE(c)) { /* show clients top down */
1554		XMoveWindow(dpy, c->win, c->x, c->y);
1555		if(!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
1556			resize(c, c->x, c->y, c->w, c->h, False);
1557		showhide(c->snext);
1558	}
1559	else { /* hide clients bottom up */
1560		showhide(c->snext);
1561		XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1562	}
1563}
1564
1565
1566void
1567sigchld(int unused) {
1568	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1569		die("Can't install SIGCHLD handler");
1570	while(0 < waitpid(-1, NULL, WNOHANG));
1571}
1572
1573void
1574spawn(const Arg *arg) {
1575	if(fork() == 0) {
1576		if(dpy)
1577			close(ConnectionNumber(dpy));
1578		setsid();
1579		execvp(((char **)arg->v)[0], (char **)arg->v);
1580		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1581		perror(" failed");
1582		exit(0);
1583	}
1584}
1585
1586void
1587tag(const Arg *arg) {
1588	if(selmon->sel && arg->ui & TAGMASK) {
1589		selmon->sel->tags = arg->ui & TAGMASK;
1590		arrange(selmon);
1591	}
1592}
1593
1594void
1595tagmon(const Arg *arg) {
1596	if(!selmon->sel || !mons->next)
1597		return;
1598	sendmon(selmon->sel, dirtomon(arg->i));
1599}
1600
1601int
1602textnw(const char *text, unsigned int len) {
1603	XRectangle r;
1604
1605	if(dc.font.set) {
1606		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1607		return r.width;
1608	}
1609	return XTextWidth(dc.font.xfont, text, len);
1610}
1611
1612void
1613tile(Monitor *m) {
1614	int x, y, h, w, mw;
1615	unsigned int i, n;
1616	Client *c;
1617
1618	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1619	if(n == 0)
1620		return;
1621	/* master */
1622	c = nexttiled(m->clients);
1623	mw = m->mfact * m->ww;
1624	resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1625	if(--n == 0)
1626		return;
1627	/* tile stack */
1628	x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1629	y = m->wy;
1630	w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1631	h = m->wh / n;
1632	if(h < bh)
1633		h = m->wh;
1634	for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1635		resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1636		       ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1637		if(h != m->wh)
1638			y = c->y + HEIGHT(c);
1639	}
1640}
1641
1642void
1643togglebar(const Arg *arg) {
1644	selmon->showbar = !selmon->showbar;
1645	updatebarpos(selmon);
1646	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1647	arrange(selmon);
1648}
1649
1650void
1651togglefloating(const Arg *arg) {
1652	if(!selmon->sel)
1653		return;
1654	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1655	if(selmon->sel->isfloating)
1656		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1657		       selmon->sel->w, selmon->sel->h, False);
1658	arrange(selmon);
1659}
1660
1661void
1662toggletag(const Arg *arg) {
1663	unsigned int newtags;
1664
1665	if(!selmon->sel)
1666		return;
1667	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1668	if(newtags) {
1669		selmon->sel->tags = newtags;
1670		arrange(selmon);
1671	}
1672}
1673
1674void
1675toggleview(const Arg *arg) {
1676	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1677
1678	if(newtagset) {
1679		selmon->tagset[selmon->seltags] = newtagset;
1680		arrange(selmon);
1681	}
1682}
1683
1684void
1685unfocus(Client *c) {
1686	if(!c)
1687		return;
1688	grabbuttons(c, False);
1689	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1690	XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1691}
1692
1693void
1694unmanage(Client *c, Bool destroyed) {
1695	Monitor *m = c->mon;
1696	XWindowChanges wc;
1697
1698	/* The server grab construct avoids race conditions. */
1699	detach(c);
1700	detachstack(c);
1701	if(!destroyed) {
1702		wc.border_width = c->oldbw;
1703		XGrabServer(dpy);
1704		XSetErrorHandler(xerrordummy);
1705		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1706		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1707		setclientstate(c, WithdrawnState);
1708		XSync(dpy, False);
1709		XSetErrorHandler(xerror);
1710		XUngrabServer(dpy);
1711	}
1712	free(c);
1713	focus(NULL);
1714	arrange(m);
1715}
1716
1717void
1718unmapnotify(XEvent *e) {
1719	Client *c;
1720	XUnmapEvent *ev = &e->xunmap;
1721
1722	if((c = wintoclient(ev->window)))
1723		unmanage(c, False);
1724}
1725
1726void
1727updatebars(void) {
1728	Monitor *m;
1729	XSetWindowAttributes wa;
1730
1731	wa.override_redirect = True;
1732	wa.background_pixmap = ParentRelative;
1733	wa.event_mask = ButtonPressMask|ExposureMask;
1734	for(m = mons; m; m = m->next) {
1735		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1736		                          CopyFromParent, DefaultVisual(dpy, screen),
1737		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1738		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1739		XMapRaised(dpy, m->barwin);
1740	}
1741}
1742
1743void
1744updatebarpos(Monitor *m) {
1745	m->wy = m->my;
1746	m->wh = m->mh;
1747	if(m->showbar) {
1748		m->wh -= bh;
1749		m->by = m->topbar ? m->wy : m->wy + m->wh;
1750		m->wy = m->topbar ? m->wy + bh : m->wy;
1751	}
1752	else
1753		m->by = -bh;
1754}
1755
1756Bool
1757updategeom(void) {
1758	Bool dirty = False;
1759
1760#ifdef XINERAMA
1761	if(XineramaIsActive(dpy)) {
1762		int i, j, n, nn;
1763		Client *c;
1764		Monitor *m;
1765		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1766		XineramaScreenInfo *unique = NULL;
1767
1768		info = XineramaQueryScreens(dpy, &nn);
1769		for(n = 0, m = mons; m; m = m->next, n++);
1770		/* only consider unique geometries as separate screens */
1771		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1772			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1773		for(i = 0, j = 0; i < nn; i++)
1774			if(isuniquegeom(unique, j, &info[i]))
1775				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1776		XFree(info);
1777		nn = j;
1778		if(n <= nn) {
1779			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1780				for(m = mons; m && m->next; m = m->next);
1781				if(m)
1782					m->next = createmon();
1783				else
1784					mons = createmon();
1785			}
1786			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1787				if(i >= n
1788				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1789				    || unique[i].width != m->mw || unique[i].height != m->mh))
1790				{
1791					dirty = True;
1792					m->num = i;
1793					m->mx = m->wx = unique[i].x_org;
1794					m->my = m->wy = unique[i].y_org;
1795					m->mw = m->ww = unique[i].width;
1796					m->mh = m->wh = unique[i].height;
1797					updatebarpos(m);
1798				}
1799		}
1800		else { /* less monitors available nn < n */
1801			for(i = nn; i < n; i++) {
1802				for(m = mons; m && m->next; m = m->next);
1803				while(m->clients) {
1804					dirty = True;
1805					c = m->clients;
1806					m->clients = c->next;
1807					detachstack(c);
1808					c->mon = mons;
1809					attach(c);
1810					attachstack(c);
1811				}
1812				if(m == selmon)
1813					selmon = mons;
1814				cleanupmon(m);
1815			}
1816		}
1817		free(unique);
1818	}
1819	else
1820#endif /* XINERAMA */
1821	/* default monitor setup */
1822	{
1823		if(!mons)
1824			mons = createmon();
1825		if(mons->mw != sw || mons->mh != sh) {
1826			dirty = True;
1827			mons->mw = mons->ww = sw;
1828			mons->mh = mons->wh = sh;
1829			updatebarpos(mons);
1830		}
1831	}
1832	if(dirty) {
1833		selmon = mons;
1834		selmon = wintomon(root);
1835	}
1836	return dirty;
1837}
1838
1839void
1840updatenumlockmask(void) {
1841	unsigned int i, j;
1842	XModifierKeymap *modmap;
1843
1844	numlockmask = 0;
1845	modmap = XGetModifierMapping(dpy);
1846	for(i = 0; i < 8; i++)
1847		for(j = 0; j < modmap->max_keypermod; j++)
1848			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1849			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1850				numlockmask = (1 << i);
1851	XFreeModifiermap(modmap);
1852}
1853
1854void
1855updatesizehints(Client *c) {
1856	long msize;
1857	XSizeHints size;
1858
1859	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1860		/* size is uninitialized, ensure that size.flags aren't used */
1861		size.flags = PSize;
1862	if(size.flags & PBaseSize) {
1863		c->basew = size.base_width;
1864		c->baseh = size.base_height;
1865	}
1866	else if(size.flags & PMinSize) {
1867		c->basew = size.min_width;
1868		c->baseh = size.min_height;
1869	}
1870	else
1871		c->basew = c->baseh = 0;
1872	if(size.flags & PResizeInc) {
1873		c->incw = size.width_inc;
1874		c->inch = size.height_inc;
1875	}
1876	else
1877		c->incw = c->inch = 0;
1878	if(size.flags & PMaxSize) {
1879		c->maxw = size.max_width;
1880		c->maxh = size.max_height;
1881	}
1882	else
1883		c->maxw = c->maxh = 0;
1884	if(size.flags & PMinSize) {
1885		c->minw = size.min_width;
1886		c->minh = size.min_height;
1887	}
1888	else if(size.flags & PBaseSize) {
1889		c->minw = size.base_width;
1890		c->minh = size.base_height;
1891	}
1892	else
1893		c->minw = c->minh = 0;
1894	if(size.flags & PAspect) {
1895		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1896		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1897	}
1898	else
1899		c->maxa = c->mina = 0.0;
1900	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1901	             && c->maxw == c->minw && c->maxh == c->minh);
1902}
1903
1904void
1905updatetitle(Client *c) {
1906	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1907		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1908	if(c->name[0] == '\0') /* hack to mark broken clients */
1909		strcpy(c->name, broken);
1910}
1911
1912void
1913updatestatus(void) {
1914	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1915		strcpy(stext, "dwm-"VERSION);
1916	drawbar(selmon);
1917}
1918
1919void
1920updatewmhints(Client *c) {
1921	XWMHints *wmh;
1922
1923	if((wmh = XGetWMHints(dpy, c->win))) {
1924		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1925			wmh->flags &= ~XUrgencyHint;
1926			XSetWMHints(dpy, c->win, wmh);
1927		}
1928		else
1929			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1930		XFree(wmh);
1931	}
1932}
1933
1934void
1935view(const Arg *arg) {
1936	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1937		return;
1938	selmon->seltags ^= 1; /* toggle sel tagset */
1939	if(arg->ui & TAGMASK)
1940		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1941	arrange(selmon);
1942}
1943
1944Client *
1945wintoclient(Window w) {
1946	Client *c;
1947	Monitor *m;
1948
1949	for(m = mons; m; m = m->next)
1950		for(c = m->clients; c; c = c->next)
1951			if(c->win == w)
1952				return c;
1953	return NULL;
1954}
1955
1956Monitor *
1957wintomon(Window w) {
1958	int x, y;
1959	Client *c;
1960	Monitor *m;
1961
1962	if(w == root && getrootptr(&x, &y))
1963		return ptrtomon(x, y);
1964	for(m = mons; m; m = m->next)
1965		if(w == m->barwin)
1966			return m;
1967	if((c = wintoclient(w)))
1968		return c->mon;
1969	return selmon;
1970}
1971
1972/* There's no way to check accesses to destroyed windows, thus those cases are
1973 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1974 * default error handler, which may call exit.  */
1975int
1976xerror(Display *dpy, XErrorEvent *ee) {
1977	if(ee->error_code == BadWindow
1978	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1979	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1980	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1981	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1982	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1983	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1984	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1985	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1986		return 0;
1987	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1988			ee->request_code, ee->error_code);
1989	return xerrorxlib(dpy, ee); /* may call exit */
1990}
1991
1992int
1993xerrordummy(Display *dpy, XErrorEvent *ee) {
1994	return 0;
1995}
1996
1997/* Startup Error handler to check if another window manager
1998 * is already running. */
1999int
2000xerrorstart(Display *dpy, XErrorEvent *ee) {
2001	otherwm = True;
2002	return -1;
2003}
2004
2005void
2006zoom(const Arg *arg) {
2007	Client *c = selmon->sel;
2008
2009	if(!selmon->lt[selmon->sellt]->arrange
2010	|| selmon->lt[selmon->sellt]->arrange == monocle
2011	|| (selmon->sel && selmon->sel->isfloating))
2012		return;
2013	if(c == nexttiled(selmon->clients))
2014		if(!c || !(c = nexttiled(c->next)))
2015			return;
2016	detach(c);
2017	attach(c);
2018	focus(c);
2019	arrange(c->mon);
2020}
2021
2022int
2023main(int argc, char *argv[]) {
2024	if(argc == 2 && !strcmp("-v", argv[1]))
2025		die("dwm-"VERSION", © 2006-2009 dwm engineers, see LICENSE for details\n");
2026	else if(argc != 1)
2027		die("usage: dwm [-v]\n");
2028	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2029		fputs("warning: no locale support\n", stderr);
2030	if(!(dpy = XOpenDisplay(NULL)))
2031		die("dwm: cannot open display\n");
2032	checkotherwm();
2033	setup();
2034	scan();
2035	run();
2036	cleanup();
2037	XCloseDisplay(dpy);
2038	return 0;
2039}