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