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#include <X11/XKBlib.h>
  40#include <fontconfig/fontconfig.h>
  41#include <X11/Xft/Xft.h>
  42#ifdef XINERAMA
  43#include <X11/extensions/Xinerama.h>
  44#endif /* XINERAMA */
  45
  46#include "draw.h"
  47
  48/* macros */
  49#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  50#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  51#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  52                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  53#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  54#define LENGTH(X)               (sizeof X / sizeof X[0])
  55#define MAX(A, B)               ((A) > (B) ? (A) : (B))
  56#define MIN(A, B)               ((A) < (B) ? (A) : (B))
  57#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  58#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  59#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  60#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  61#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  62
  63/* enums */
  64enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  65enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  66enum { NetSupported, NetWMName, NetWMState,
  67       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  68       NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  69enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  70enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  71       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  72
  73typedef union {
  74	int i;
  75	unsigned int ui;
  76	float f;
  77	const void *v;
  78} Arg;
  79
  80typedef struct {
  81	unsigned int click;
  82	unsigned int mask;
  83	unsigned int button;
  84	void (*func)(const Arg *arg);
  85	const Arg arg;
  86} Button;
  87
  88typedef struct Monitor Monitor;
  89typedef struct Client Client;
  90struct Client {
  91	char name[256];
  92	float mina, maxa;
  93	int x, y, w, h;
  94	int oldx, oldy, oldw, oldh;
  95	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  96	int bw, oldbw;
  97	unsigned int tags;
  98	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  99	Client *next;
 100	Client *snext;
 101	Monitor *mon;
 102	Window win;
 103};
 104
 105typedef struct {
 106	int x, y, w, h;
 107	XftColor norm[ColLast];
 108	XftColor sel[ColLast];
 109	Drawable drawable;
 110	GC gc;
 111	struct {
 112		int ascent;
 113		int descent;
 114		int height;
 115		XftFont *xfont;
 116	} font;
 117} DC; /* draw context */
 118
 119typedef struct {
 120	unsigned int mod;
 121	KeySym keysym;
 122	void (*func)(const Arg *);
 123	const Arg arg;
 124} Key;
 125
 126typedef struct {
 127	const char *symbol;
 128	void (*arrange)(Monitor *);
 129} Layout;
 130
 131struct Monitor {
 132	char ltsymbol[16];
 133	float mfact;
 134	int nmaster;
 135	int num;
 136	int by;               /* bar geometry */
 137	int mx, my, mw, mh;   /* screen size */
 138	int wx, wy, ww, wh;   /* window area  */
 139	unsigned int seltags;
 140	unsigned int sellt;
 141	unsigned int tagset[2];
 142	Bool showbar;
 143	Bool topbar;
 144	Client *clients;
 145	Client *sel;
 146	Client *stack;
 147	Monitor *next;
 148	Window barwin;
 149	const Layout *lt[2];
 150};
 151
 152typedef struct {
 153	const char *class;
 154	const char *instance;
 155	const char *title;
 156	unsigned int tags;
 157	Bool isfloating;
 158	int monitor;
 159} Rule;
 160
 161/* function declarations */
 162static void applyrules(Client *c);
 163static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 164static void arrange(Monitor *m);
 165static void arrangemon(Monitor *m);
 166static void attach(Client *c);
 167static void attachstack(Client *c);
 168static void buttonpress(XEvent *e);
 169static void checkotherwm(void);
 170static void cleanup(void);
 171static void cleanupmon(Monitor *mon);
 172static void clearurgent(Client *c);
 173static void clientmessage(XEvent *e);
 174static void configure(Client *c);
 175static void configurenotify(XEvent *e);
 176static void configurerequest(XEvent *e);
 177static Monitor *createmon(void);
 178static void destroynotify(XEvent *e);
 179static void detach(Client *c);
 180static void detachstack(Client *c);
 181static void die(const char *errstr, ...);
 182static Monitor *dirtomon(int dir);
 183static void drawbar(Monitor *m);
 184static void drawbars(void);
 185static void drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]);
 186static void drawtext(const char *text, XftColor col[ColLast], Bool invert);
 187static void enternotify(XEvent *e);
 188static void expose(XEvent *e);
 189static void focus(Client *c);
 190static void focusin(XEvent *e);
 191static void focusmon(const Arg *arg);
 192static void focusstack(const Arg *arg);
 193static XftColor getcolor(const char *colstr);
 194static Bool getrootptr(int *x, int *y);
 195static long getstate(Window w);
 196static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 197static void grabbuttons(Client *c, Bool focused);
 198static void grabkeys(void);
 199static void incnmaster(const Arg *arg);
 200static void initfont(const char *fontstr);
 201static void keypress(XEvent *e);
 202static void killclient(const Arg *arg);
 203static void manage(Window w, XWindowAttributes *wa);
 204static void mappingnotify(XEvent *e);
 205static void maprequest(XEvent *e);
 206static void monocle(Monitor *m);
 207static void motionnotify(XEvent *e);
 208static void movemouse(const Arg *arg);
 209static Client *nexttiled(Client *c);
 210static void pop(Client *);
 211static void propertynotify(XEvent *e);
 212static void quit(const Arg *arg);
 213static Monitor *recttomon(int x, int y, int w, int h);
 214static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 215static void resizeclient(Client *c, int x, int y, int w, int h);
 216static void resizemouse(const Arg *arg);
 217static void restack(Monitor *m);
 218static void run(void);
 219static void scan(void);
 220static Bool sendevent(Client *c, Atom proto);
 221static void sendmon(Client *c, Monitor *m);
 222static void setclientstate(Client *c, long state);
 223static void setfocus(Client *c);
 224static void setfullscreen(Client *c, Bool fullscreen);
 225static void setlayout(const Arg *arg);
 226static void setmfact(const Arg *arg);
 227static void setup(void);
 228static void showhide(Client *c);
 229static void sigchld(int unused);
 230static void spawn(const Arg *arg);
 231static void tag(const Arg *arg);
 232static void tagmon(const Arg *arg);
 233static int textnw(const char *text, unsigned int len);
 234static void tile(Monitor *);
 235static void togglebar(const Arg *arg);
 236static void togglefloating(const Arg *arg);
 237static void toggletag(const Arg *arg);
 238static void toggleview(const Arg *arg);
 239static void unfocus(Client *c, Bool setfocus);
 240static void unmanage(Client *c, Bool destroyed);
 241static void unmapnotify(XEvent *e);
 242static Bool updategeom(void);
 243static void updatebarpos(Monitor *m);
 244static void updatebars(void);
 245static void updateclientlist(void);
 246static void updatenumlockmask(void);
 247static void updatesizehints(Client *c);
 248static void updatestatus(void);
 249static void updatewindowtype(Client *c);
 250static void updatetitle(Client *c);
 251static void updatewmhints(Client *c);
 252static void view(const Arg *arg);
 253static Client *wintoclient(Window w);
 254static Monitor *wintomon(Window w);
 255static int xerror(Display *dpy, XErrorEvent *ee);
 256static int xerrordummy(Display *dpy, XErrorEvent *ee);
 257static int xerrorstart(Display *dpy, XErrorEvent *ee);
 258static void zoom(const Arg *arg);
 259
 260/* variables */
 261static const char broken[] = "broken";
 262static char stext[256];
 263static int screen;
 264static int sw, sh;           /* X display screen geometry width, height */
 265static int bh, blw = 0;      /* bar geometry */
 266static int (*xerrorxlib)(Display *, XErrorEvent *);
 267static unsigned int numlockmask = 0;
 268static void (*handler[LASTEvent]) (XEvent *) = {
 269	[ButtonPress] = buttonpress,
 270	[ClientMessage] = clientmessage,
 271	[ConfigureRequest] = configurerequest,
 272	[ConfigureNotify] = configurenotify,
 273	[DestroyNotify] = destroynotify,
 274	[EnterNotify] = enternotify,
 275	[Expose] = expose,
 276	[FocusIn] = focusin,
 277	[KeyPress] = keypress,
 278	[MappingNotify] = mappingnotify,
 279	[MapRequest] = maprequest,
 280	[MotionNotify] = motionnotify,
 281	[PropertyNotify] = propertynotify,
 282	[UnmapNotify] = unmapnotify
 283};
 284static Atom wmatom[WMLast], netatom[NetLast];
 285static Bool running = True, usexkb;
 286static Cursor cursor[CurLast];
 287static Display *dpy;
 288static DC dc;
 289static Monitor *mons = NULL, *selmon = NULL;
 290static Window root;
 291
 292/* configuration, allows nested code to access above variables */
 293#include "config.h"
 294
 295/* compile-time check if all tags fit into an unsigned int bit array. */
 296struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 297
 298/* function implementations */
 299void
 300applyrules(Client *c) {
 301	const char *class, *instance;
 302	unsigned int i;
 303	const Rule *r;
 304	Monitor *m;
 305	XClassHint ch = { NULL, NULL };
 306
 307	/* rule matching */
 308	c->isfloating = c->tags = 0;
 309	XGetClassHint(dpy, c->win, &ch);
 310	class    = ch.res_class ? ch.res_class : broken;
 311	instance = ch.res_name  ? ch.res_name  : broken;
 312
 313	for(i = 0; i < LENGTH(rules); i++) {
 314		r = &rules[i];
 315		if((!r->title || strstr(c->name, r->title))
 316		&& (!r->class || strstr(class, r->class))
 317		&& (!r->instance || strstr(instance, r->instance)))
 318		{
 319			c->isfloating = r->isfloating;
 320			c->tags |= r->tags;
 321			for(m = mons; m && m->num != r->monitor; m = m->next);
 322			if(m)
 323				c->mon = m;
 324		}
 325	}
 326	if(ch.res_class)
 327		XFree(ch.res_class);
 328	if(ch.res_name)
 329		XFree(ch.res_name);
 330	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 331}
 332
 333Bool
 334applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 335	Bool baseismin;
 336	Monitor *m = c->mon;
 337
 338	/* set minimum possible */
 339	*w = MAX(1, *w);
 340	*h = MAX(1, *h);
 341	if(interact) {
 342		if(*x > sw)
 343			*x = sw - WIDTH(c);
 344		if(*y > sh)
 345			*y = sh - HEIGHT(c);
 346		if(*x + *w + 2 * c->bw < 0)
 347			*x = 0;
 348		if(*y + *h + 2 * c->bw < 0)
 349			*y = 0;
 350	}
 351	else {
 352		if(*x >= m->wx + m->ww)
 353			*x = m->wx + m->ww - WIDTH(c);
 354		if(*y >= m->wy + m->wh)
 355			*y = m->wy + m->wh - HEIGHT(c);
 356		if(*x + *w + 2 * c->bw <= m->wx)
 357			*x = m->wx;
 358		if(*y + *h + 2 * c->bw <= m->wy)
 359			*y = m->wy;
 360	}
 361	if(*h < bh)
 362		*h = bh;
 363	if(*w < bh)
 364		*w = bh;
 365	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 366		/* see last two sentences in ICCCM 4.1.2.3 */
 367		baseismin = c->basew == c->minw && c->baseh == c->minh;
 368		if(!baseismin) { /* temporarily remove base dimensions */
 369			*w -= c->basew;
 370			*h -= c->baseh;
 371		}
 372		/* adjust for aspect limits */
 373		if(c->mina > 0 && c->maxa > 0) {
 374			if(c->maxa < (float)*w / *h)
 375				*w = *h * c->maxa + 0.5;
 376			else if(c->mina < (float)*h / *w)
 377				*h = *w * c->mina + 0.5;
 378		}
 379		if(baseismin) { /* increment calculation requires this */
 380			*w -= c->basew;
 381			*h -= c->baseh;
 382		}
 383		/* adjust for increment value */
 384		if(c->incw)
 385			*w -= *w % c->incw;
 386		if(c->inch)
 387			*h -= *h % c->inch;
 388		/* restore base dimensions */
 389		*w = MAX(*w + c->basew, c->minw);
 390		*h = MAX(*h + c->baseh, c->minh);
 391		if(c->maxw)
 392			*w = MIN(*w, c->maxw);
 393		if(c->maxh)
 394			*h = MIN(*h, c->maxh);
 395	}
 396	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 397}
 398
 399void
 400arrange(Monitor *m) {
 401	if(m)
 402		showhide(m->stack);
 403	else for(m = mons; m; m = m->next)
 404		showhide(m->stack);
 405	if(m) {
 406		arrangemon(m);
 407		restack(m);
 408	} else for(m = mons; m; m = m->next)
 409		arrangemon(m);
 410}
 411
 412void
 413arrangemon(Monitor *m) {
 414	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 415	if(m->lt[m->sellt]->arrange)
 416		m->lt[m->sellt]->arrange(m);
 417}
 418
 419void
 420attach(Client *c) {
 421	c->next = c->mon->clients;
 422	c->mon->clients = c;
 423}
 424
 425void
 426attachstack(Client *c) {
 427	c->snext = c->mon->stack;
 428	c->mon->stack = c;
 429}
 430
 431void
 432buttonpress(XEvent *e) {
 433	unsigned int i, x, click;
 434	Arg arg = {0};
 435	Client *c;
 436	Monitor *m;
 437	XButtonPressedEvent *ev = &e->xbutton;
 438
 439	click = ClkRootWin;
 440	/* focus monitor if necessary */
 441	if((m = wintomon(ev->window)) && m != selmon) {
 442		unfocus(selmon->sel, True);
 443		selmon = m;
 444		focus(NULL);
 445	}
 446	if(ev->window == selmon->barwin) {
 447		i = x = 0;
 448		do
 449			x += TEXTW(tags[i]);
 450		while(ev->x >= x && ++i < LENGTH(tags));
 451		if(i < LENGTH(tags)) {
 452			click = ClkTagBar;
 453			arg.ui = 1 << i;
 454		}
 455		else if(ev->x < x + blw)
 456			click = ClkLtSymbol;
 457		else if(ev->x > selmon->ww - TEXTW(stext))
 458			click = ClkStatusText;
 459		else
 460			click = ClkWinTitle;
 461	}
 462	else if((c = wintoclient(ev->window))) {
 463		focus(c);
 464		click = ClkClientWin;
 465	}
 466	for(i = 0; i < LENGTH(buttons); i++)
 467		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 468		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 469			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 470}
 471
 472void
 473checkotherwm(void) {
 474	xerrorxlib = XSetErrorHandler(xerrorstart);
 475	/* this causes an error if some other window manager is running */
 476	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 477	XSync(dpy, False);
 478	XSetErrorHandler(xerror);
 479	XSync(dpy, False);
 480}
 481
 482void
 483cleanup(void) {
 484	Arg a = {.ui = ~0};
 485	Layout foo = { "", NULL };
 486	Monitor *m;
 487
 488	view(&a);
 489	selmon->lt[selmon->sellt] = &foo;
 490	for(m = mons; m; m = m->next)
 491		while(m->stack)
 492			unmanage(m->stack, False);
 493	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 494	XFreePixmap(dpy, dc.drawable);
 495	XFreeGC(dpy, dc.gc);
 496	XFreeCursor(dpy, cursor[CurNormal]);
 497	XFreeCursor(dpy, cursor[CurResize]);
 498	XFreeCursor(dpy, cursor[CurMove]);
 499	while(mons)
 500		cleanupmon(mons);
 501	XSync(dpy, False);
 502	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 503	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 504}
 505
 506void
 507cleanupmon(Monitor *mon) {
 508	Monitor *m;
 509
 510	if(mon == mons)
 511		mons = mons->next;
 512	else {
 513		for(m = mons; m && m->next != mon; m = m->next);
 514		m->next = mon->next;
 515	}
 516	XUnmapWindow(dpy, mon->barwin);
 517	XDestroyWindow(dpy, mon->barwin);
 518	free(mon);
 519}
 520
 521void
 522clearurgent(Client *c) {
 523	XWMHints *wmh;
 524
 525	c->isurgent = False;
 526	if(!(wmh = XGetWMHints(dpy, c->win)))
 527		return;
 528	wmh->flags &= ~XUrgencyHint;
 529	XSetWMHints(dpy, c->win, wmh);
 530	XFree(wmh);
 531}
 532
 533void
 534clientmessage(XEvent *e) {
 535	XClientMessageEvent *cme = &e->xclient;
 536	Client *c = wintoclient(cme->window);
 537
 538	if(!c)
 539		return;
 540	if(cme->message_type == netatom[NetWMState]) {
 541		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 542			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 543			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 544	}
 545	else if(cme->message_type == netatom[NetActiveWindow]) {
 546		if(!ISVISIBLE(c)) {
 547			c->mon->seltags ^= 1;
 548			c->mon->tagset[c->mon->seltags] = c->tags;
 549		}
 550		pop(c);
 551	}
 552}
 553
 554void
 555configure(Client *c) {
 556	XConfigureEvent ce;
 557
 558	ce.type = ConfigureNotify;
 559	ce.display = dpy;
 560	ce.event = c->win;
 561	ce.window = c->win;
 562	ce.x = c->x;
 563	ce.y = c->y;
 564	ce.width = c->w;
 565	ce.height = c->h;
 566	ce.border_width = c->bw;
 567	ce.above = None;
 568	ce.override_redirect = False;
 569	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 570}
 571
 572void
 573configurenotify(XEvent *e) {
 574	Monitor *m;
 575	XConfigureEvent *ev = &e->xconfigure;
 576	Bool dirty;
 577
 578	// TODO: updategeom handling sucks, needs to be simplified
 579	if(ev->window == root) {
 580		dirty = (sw != ev->width || sh != ev->height);
 581		sw = ev->width;
 582		sh = ev->height;
 583		if(updategeom() || dirty) {
 584			if(dc.drawable != 0)
 585				XFreePixmap(dpy, dc.drawable);
 586			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 587			updatebars();
 588			for(m = mons; m; m = m->next)
 589				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 590			focus(NULL);
 591			arrange(NULL);
 592		}
 593	}
 594}
 595
 596void
 597configurerequest(XEvent *e) {
 598	Client *c;
 599	Monitor *m;
 600	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 601	XWindowChanges wc;
 602
 603	if((c = wintoclient(ev->window))) {
 604		if(ev->value_mask & CWBorderWidth)
 605			c->bw = ev->border_width;
 606		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 607			m = c->mon;
 608			if(ev->value_mask & CWX) {
 609				c->oldx = c->x;
 610				c->x = m->mx + ev->x;
 611			}
 612			if(ev->value_mask & CWY) {
 613				c->oldy = c->y;
 614				c->y = m->my + ev->y;
 615			}
 616			if(ev->value_mask & CWWidth) {
 617				c->oldw = c->w;
 618				c->w = ev->width;
 619			}
 620			if(ev->value_mask & CWHeight) {
 621				c->oldh = c->h;
 622				c->h = ev->height;
 623			}
 624			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 625				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 626			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 627				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 628			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 629				configure(c);
 630			if(ISVISIBLE(c))
 631				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 632		}
 633		else
 634			configure(c);
 635	}
 636	else {
 637		wc.x = ev->x;
 638		wc.y = ev->y;
 639		wc.width = ev->width;
 640		wc.height = ev->height;
 641		wc.border_width = ev->border_width;
 642		wc.sibling = ev->above;
 643		wc.stack_mode = ev->detail;
 644		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 645	}
 646	XSync(dpy, False);
 647}
 648
 649Monitor *
 650createmon(void) {
 651	Monitor *m;
 652
 653	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 654		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 655	m->tagset[0] = m->tagset[1] = 1;
 656	m->mfact = mfact;
 657	m->nmaster = nmaster;
 658	m->showbar = showbar;
 659	m->topbar = topbar;
 660	m->lt[0] = &layouts[0];
 661	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 662	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 663	return m;
 664}
 665
 666void
 667destroynotify(XEvent *e) {
 668	Client *c;
 669	XDestroyWindowEvent *ev = &e->xdestroywindow;
 670
 671	if((c = wintoclient(ev->window)))
 672		unmanage(c, True);
 673}
 674
 675void
 676detach(Client *c) {
 677	Client **tc;
 678
 679	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 680	*tc = c->next;
 681}
 682
 683void
 684detachstack(Client *c) {
 685	Client **tc, *t;
 686
 687	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 688	*tc = c->snext;
 689
 690	if(c == c->mon->sel) {
 691		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 692		c->mon->sel = t;
 693	}
 694}
 695
 696void
 697die(const char *errstr, ...) {
 698	va_list ap;
 699
 700	va_start(ap, errstr);
 701	vfprintf(stderr, errstr, ap);
 702	va_end(ap);
 703	exit(EXIT_FAILURE);
 704}
 705
 706Monitor *
 707dirtomon(int dir) {
 708	Monitor *m = NULL;
 709
 710	if(dir > 0) {
 711		if(!(m = selmon->next))
 712			m = mons;
 713	}
 714	else if(selmon == mons)
 715		for(m = mons; m->next; m = m->next);
 716	else
 717		for(m = mons; m->next != selmon; m = m->next);
 718	return m;
 719}
 720
 721void
 722drawbar(Monitor *m) {
 723	int x;
 724	unsigned int i, occ = 0, urg = 0;
 725	XftColor *col;
 726	Client *c;
 727
 728	for(c = m->clients; c; c = c->next) {
 729		occ |= c->tags;
 730		if(c->isurgent)
 731			urg |= c->tags;
 732	}
 733	dc.x = 0;
 734	for(i = 0; i < LENGTH(tags); i++) {
 735		dc.w = TEXTW(tags[i]);
 736		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 737		drawtext(tags[i], col, urg & 1 << i);
 738		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 739		           occ & 1 << i, urg & 1 << i, col);
 740		dc.x += dc.w;
 741	}
 742	dc.w = blw = TEXTW(m->ltsymbol);
 743	drawtext(m->ltsymbol, dc.norm, False);
 744	dc.x += dc.w;
 745	x = dc.x;
 746	if(m == selmon) { /* status is only drawn on selected monitor */
 747		dc.w = TEXTW(stext);
 748		dc.x = m->ww - dc.w;
 749		if(dc.x < x) {
 750			dc.x = x;
 751			dc.w = m->ww - x;
 752		}
 753		drawtext(stext, dc.norm, False);
 754	}
 755	else
 756		dc.x = m->ww;
 757	if((dc.w = dc.x - x) > bh) {
 758		dc.x = x;
 759		if(m->sel) {
 760			col = m == selmon ? dc.sel : dc.norm;
 761			drawtext(m->sel->name, col, False);
 762			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 763		}
 764		else
 765			drawtext(NULL, dc.norm, False);
 766	}
 767	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 768	XSync(dpy, False);
 769}
 770
 771void
 772drawbars(void) {
 773	Monitor *m;
 774
 775	for(m = mons; m; m = m->next)
 776		drawbar(m);
 777}
 778
 779void
 780drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]) {
 781	int x;
 782
 783	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG].pixel);
 784	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 785	if(filled)
 786		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 787	else if(empty)
 788		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 789}
 790
 791void
 792drawtext(const char *text, XftColor col[ColLast], Bool invert) {
 793	char buf[256];
 794	int i, x, y, h, len, olen;
 795	XftDraw *d;
 796
 797	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG].pixel);
 798	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 799	if(!text)
 800		return;
 801	olen = strlen(text);
 802	h = dc.font.ascent + dc.font.descent;
 803	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 804	x = dc.x + (h / 2);
 805	/* shorten text if necessary */
 806	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 807	if(!len)
 808		return;
 809	memcpy(buf, text, len);
 810	if(len < olen)
 811		for(i = len; i && i > len - 3; buf[--i] = '.');
 812
 813	d = XftDrawCreate(dpy, dc.drawable, DefaultVisual(dpy, screen), DefaultColormap(dpy,screen));
 814
 815	XftDrawStringUtf8(d, &col[invert ? ColBG : ColFG], dc.font.xfont, x, y, (XftChar8 *) buf, len);
 816	XftDrawDestroy(d);
 817}
 818
 819void
 820enternotify(XEvent *e) {
 821	Client *c;
 822	Monitor *m;
 823	XCrossingEvent *ev = &e->xcrossing;
 824
 825	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 826		return;
 827	c = wintoclient(ev->window);
 828	m = c ? c->mon : wintomon(ev->window);
 829	if(m != selmon) {
 830		unfocus(selmon->sel, True);
 831		selmon = m;
 832	}
 833	else if(!c || c == selmon->sel)
 834		return;
 835	focus(c);
 836}
 837
 838void
 839expose(XEvent *e) {
 840	Monitor *m;
 841	XExposeEvent *ev = &e->xexpose;
 842
 843	if(ev->count == 0 && (m = wintomon(ev->window)))
 844		drawbar(m);
 845}
 846
 847void
 848focus(Client *c) {
 849	if(!c || !ISVISIBLE(c))
 850		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 851	/* was if(selmon->sel) */
 852	if(selmon->sel && selmon->sel != c)
 853		unfocus(selmon->sel, False);
 854	if(c) {
 855		if(c->mon != selmon)
 856			selmon = c->mon;
 857		if(c->isurgent)
 858			clearurgent(c);
 859		detachstack(c);
 860		attachstack(c);
 861		grabbuttons(c, True);
 862		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder].pixel);
 863		setfocus(c);
 864	}
 865	else {
 866		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 867		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 868	}
 869	selmon->sel = c;
 870	drawbars();
 871}
 872
 873void
 874focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 875	XFocusChangeEvent *ev = &e->xfocus;
 876
 877	if(selmon->sel && ev->window != selmon->sel->win)
 878		setfocus(selmon->sel);
 879}
 880
 881void
 882focusmon(const Arg *arg) {
 883	Monitor *m;
 884
 885	if(!mons->next)
 886		return;
 887	if((m = dirtomon(arg->i)) == selmon)
 888		return;
 889	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 890					in gedit and anjuta */
 891	selmon = m;
 892	focus(NULL);
 893}
 894
 895void
 896focusstack(const Arg *arg) {
 897	Client *c = NULL, *i;
 898
 899	if(!selmon->sel)
 900		return;
 901	if(arg->i > 0) {
 902		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 903		if(!c)
 904			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 905	}
 906	else {
 907		for(i = selmon->clients; i != selmon->sel; i = i->next)
 908			if(ISVISIBLE(i))
 909				c = i;
 910		if(!c)
 911			for(; i; i = i->next)
 912				if(ISVISIBLE(i))
 913					c = i;
 914	}
 915	if(c) {
 916		focus(c);
 917		restack(selmon);
 918	}
 919}
 920
 921Atom
 922getatomprop(Client *c, Atom prop) {
 923	int di;
 924	unsigned long dl;
 925	unsigned char *p = NULL;
 926	Atom da, atom = None;
 927
 928	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 929	                      &da, &di, &dl, &dl, &p) == Success && p) {
 930		atom = *(Atom *)p;
 931		XFree(p);
 932	}
 933	return atom;
 934}
 935
 936XftColor 
 937getcolor(const char *colstr) {
 938	XftColor color;
 939
 940	if(!XftColorAllocName(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), colstr, &color))
 941		die("error, cannot allocate color '%s'\n", colstr);
 942
 943	return color;
 944}
 945
 946Bool
 947getrootptr(int *x, int *y) {
 948	int di;
 949	unsigned int dui;
 950	Window dummy;
 951
 952	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 953}
 954
 955long
 956getstate(Window w) {
 957	int format;
 958	long result = -1;
 959	unsigned char *p = NULL;
 960	unsigned long n, extra;
 961	Atom real;
 962
 963	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 964	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 965		return -1;
 966	if(n != 0)
 967		result = *p;
 968	XFree(p);
 969	return result;
 970}
 971
 972Bool
 973gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 974	char **list = NULL;
 975	int n;
 976	XTextProperty name;
 977
 978	if(!text || size == 0)
 979		return False;
 980	text[0] = '\0';
 981	XGetTextProperty(dpy, w, &name, atom);
 982	if(!name.nitems)
 983		return False;
 984	if(name.encoding == XA_STRING)
 985		strncpy(text, (char *)name.value, size - 1);
 986	else {
 987		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 988			strncpy(text, *list, size - 1);
 989			XFreeStringList(list);
 990		}
 991	}
 992	text[size - 1] = '\0';
 993	XFree(name.value);
 994	return True;
 995}
 996
 997void
 998grabbuttons(Client *c, Bool focused) {
 999	updatenumlockmask();
1000	{
1001		unsigned int i, j;
1002		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1003		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1004		if(focused) {
1005			for(i = 0; i < LENGTH(buttons); i++)
1006				if(buttons[i].click == ClkClientWin)
1007					for(j = 0; j < LENGTH(modifiers); j++)
1008						XGrabButton(dpy, buttons[i].button,
1009						            buttons[i].mask | modifiers[j],
1010						            c->win, False, BUTTONMASK,
1011						            GrabModeAsync, GrabModeSync, None, None);
1012		}
1013		else
1014			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1015			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1016	}
1017}
1018
1019void
1020grabkeys(void) {
1021	updatenumlockmask();
1022	{
1023		unsigned int i, j;
1024		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1025		KeyCode code;
1026
1027		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1028		for(i = 0; i < LENGTH(keys); i++)
1029			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1030				for(j = 0; j < LENGTH(modifiers); j++)
1031					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1032						 True, GrabModeAsync, GrabModeAsync);
1033	}
1034}
1035
1036void
1037incnmaster(const Arg *arg) {
1038	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1039	arrange(selmon);
1040}
1041
1042void
1043initfont(const char *fontstr) {
1044
1045	if(!(dc.font.xfont = XftFontOpenName(dpy,screen,fontstr))
1046	&& !(dc.font.xfont = XftFontOpenName(dpy,screen,"fixed")))
1047		die("error, cannot load font: '%s'\n", fontstr);
1048
1049	dc.font.ascent = dc.font.xfont->ascent;
1050	dc.font.descent = dc.font.xfont->descent;
1051	dc.font.height = dc.font.ascent + dc.font.descent;
1052}
1053
1054#ifdef XINERAMA
1055static Bool
1056isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1057	while(n--)
1058		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1059		&& unique[n].width == info->width && unique[n].height == info->height)
1060			return False;
1061	return True;
1062}
1063#endif /* XINERAMA */
1064
1065void
1066keypress(XEvent *e) {
1067	unsigned int i;
1068	KeySym keysym;
1069	XKeyEvent *ev;
1070
1071	ev = &e->xkey;
1072	if(usexkb) {
1073		keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1074	else
1075		keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1076	for(i = 0; i < LENGTH(keys); i++)
1077		if(keysym == keys[i].keysym
1078		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1079		&& keys[i].func)
1080			keys[i].func(&(keys[i].arg));
1081}
1082
1083void
1084killclient(const Arg *arg) {
1085	if(!selmon->sel)
1086		return;
1087	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1088		XGrabServer(dpy);
1089		XSetErrorHandler(xerrordummy);
1090		XSetCloseDownMode(dpy, DestroyAll);
1091		XKillClient(dpy, selmon->sel->win);
1092		XSync(dpy, False);
1093		XSetErrorHandler(xerror);
1094		XUngrabServer(dpy);
1095	}
1096}
1097
1098void
1099manage(Window w, XWindowAttributes *wa) {
1100	Client *c, *t = NULL;
1101	Window trans = None;
1102	XWindowChanges wc;
1103
1104	if(!(c = calloc(1, sizeof(Client))))
1105		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1106	c->win = w;
1107	updatetitle(c);
1108	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1109		c->mon = t->mon;
1110		c->tags = t->tags;
1111	}
1112	else {
1113		c->mon = selmon;
1114		applyrules(c);
1115	}
1116	/* geometry */
1117	c->x = c->oldx = wa->x;
1118	c->y = c->oldy = wa->y;
1119	c->w = c->oldw = wa->width;
1120	c->h = c->oldh = wa->height;
1121	c->oldbw = wa->border_width;
1122
1123	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1124		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1125	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1126		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1127	c->x = MAX(c->x, c->mon->mx);
1128	/* only fix client y-offset, if the client center might cover the bar */
1129	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1130	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1131	c->bw = borderpx;
1132
1133	wc.border_width = c->bw;
1134	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1135	XSetWindowBorder(dpy, w, dc.norm[ColBorder].pixel);
1136	configure(c); /* propagates border_width, if size doesn't change */
1137	updatewindowtype(c);
1138	updatesizehints(c);
1139	updatewmhints(c);
1140	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1141	grabbuttons(c, False);
1142	if(!c->isfloating)
1143		c->isfloating = c->oldstate = trans != None || c->isfixed;
1144	if(c->isfloating)
1145		XRaiseWindow(dpy, c->win);
1146	attach(c);
1147	attachstack(c);
1148	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1149	                (unsigned char *) &(c->win), 1);
1150	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1151	setclientstate(c, NormalState);
1152	if (c->mon == selmon)
1153		unfocus(selmon->sel, False);
1154	c->mon->sel = c;
1155	arrange(c->mon);
1156	XMapWindow(dpy, c->win);
1157	focus(NULL);
1158}
1159
1160void
1161mappingnotify(XEvent *e) {
1162	XMappingEvent *ev = &e->xmapping;
1163
1164	XRefreshKeyboardMapping(ev);
1165	if(ev->request == MappingKeyboard)
1166		grabkeys();
1167}
1168
1169void
1170maprequest(XEvent *e) {
1171	static XWindowAttributes wa;
1172	XMapRequestEvent *ev = &e->xmaprequest;
1173
1174	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1175		return;
1176	if(wa.override_redirect)
1177		return;
1178	if(!wintoclient(ev->window))
1179		manage(ev->window, &wa);
1180}
1181
1182void
1183monocle(Monitor *m) {
1184	unsigned int n = 0;
1185	Client *c;
1186
1187	for(c = m->clients; c; c = c->next)
1188		if(ISVISIBLE(c))
1189			n++;
1190	if(n > 0) /* override layout symbol */
1191		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1192	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1193		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1194}
1195
1196void
1197motionnotify(XEvent *e) {
1198	static Monitor *mon = NULL;
1199	Monitor *m;
1200	XMotionEvent *ev = &e->xmotion;
1201
1202	if(ev->window != root)
1203		return;
1204	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1205		unfocus(selmon->sel, True);
1206		selmon = m;
1207		focus(NULL);
1208	}
1209	mon = m;
1210}
1211
1212void
1213movemouse(const Arg *arg) {
1214	int x, y, ocx, ocy, nx, ny;
1215	Client *c;
1216	Monitor *m;
1217	XEvent ev;
1218
1219	if(!(c = selmon->sel))
1220		return;
1221	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1222		return;
1223	restack(selmon);
1224	ocx = c->x;
1225	ocy = c->y;
1226	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1227	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1228		return;
1229	if(!getrootptr(&x, &y))
1230		return;
1231	do {
1232		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1233		switch(ev.type) {
1234		case ConfigureRequest:
1235		case Expose:
1236		case MapRequest:
1237			handler[ev.type](&ev);
1238			break;
1239		case MotionNotify:
1240			nx = ocx + (ev.xmotion.x - x);
1241			ny = ocy + (ev.xmotion.y - y);
1242			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1243			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1244				if(abs(selmon->wx - nx) < snap)
1245					nx = selmon->wx;
1246				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1247					nx = selmon->wx + selmon->ww - WIDTH(c);
1248				if(abs(selmon->wy - ny) < snap)
1249					ny = selmon->wy;
1250				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1251					ny = selmon->wy + selmon->wh - HEIGHT(c);
1252				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1253				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1254					togglefloating(NULL);
1255			}
1256			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1257				resize(c, nx, ny, c->w, c->h, True);
1258			break;
1259		}
1260	} while(ev.type != ButtonRelease);
1261	XUngrabPointer(dpy, CurrentTime);
1262	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1263		sendmon(c, m);
1264		selmon = m;
1265		focus(NULL);
1266	}
1267}
1268
1269Client *
1270nexttiled(Client *c) {
1271	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1272	return c;
1273}
1274
1275void
1276pop(Client *c) {
1277	detach(c);
1278	attach(c);
1279	focus(c);
1280	arrange(c->mon);
1281}
1282
1283void
1284propertynotify(XEvent *e) {
1285	Client *c;
1286	Window trans;
1287	XPropertyEvent *ev = &e->xproperty;
1288
1289	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1290		updatestatus();
1291	else if(ev->state == PropertyDelete)
1292		return; /* ignore */
1293	else if((c = wintoclient(ev->window))) {
1294		switch(ev->atom) {
1295		default: break;
1296		case XA_WM_TRANSIENT_FOR:
1297			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1298			   (c->isfloating = (wintoclient(trans)) != NULL))
1299				arrange(c->mon);
1300			break;
1301		case XA_WM_NORMAL_HINTS:
1302			updatesizehints(c);
1303			break;
1304		case XA_WM_HINTS:
1305			updatewmhints(c);
1306			drawbars();
1307			break;
1308		}
1309		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1310			updatetitle(c);
1311			if(c == c->mon->sel)
1312				drawbar(c->mon);
1313		}
1314		if(ev->atom == netatom[NetWMWindowType])
1315			updatewindowtype(c);
1316	}
1317}
1318
1319void
1320quit(const Arg *arg) {
1321	running = False;
1322}
1323
1324Monitor *
1325recttomon(int x, int y, int w, int h) {
1326	Monitor *m, *r = selmon;
1327	int a, area = 0;
1328
1329	for(m = mons; m; m = m->next)
1330		if((a = INTERSECT(x, y, w, h, m)) > area) {
1331			area = a;
1332			r = m;
1333		}
1334	return r;
1335}
1336
1337void
1338resize(Client *c, int x, int y, int w, int h, Bool interact) {
1339	if(applysizehints(c, &x, &y, &w, &h, interact))
1340		resizeclient(c, x, y, w, h);
1341}
1342
1343void
1344resizeclient(Client *c, int x, int y, int w, int h) {
1345	XWindowChanges wc;
1346
1347	c->oldx = c->x; c->x = wc.x = x;
1348	c->oldy = c->y; c->y = wc.y = y;
1349	c->oldw = c->w; c->w = wc.width = w;
1350	c->oldh = c->h; c->h = wc.height = h;
1351	wc.border_width = c->bw;
1352	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1353	configure(c);
1354	XSync(dpy, False);
1355}
1356
1357void
1358resizemouse(const Arg *arg) {
1359	int ocx, ocy;
1360	int nw, nh;
1361	Client *c;
1362	Monitor *m;
1363	XEvent ev;
1364
1365	if(!(c = selmon->sel))
1366		return;
1367	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1368		return;
1369	restack(selmon);
1370	ocx = c->x;
1371	ocy = c->y;
1372	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1373	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1374		return;
1375	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1376	do {
1377		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1378		switch(ev.type) {
1379		case ConfigureRequest:
1380		case Expose:
1381		case MapRequest:
1382			handler[ev.type](&ev);
1383			break;
1384		case MotionNotify:
1385			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1386			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1387			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1388			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1389			{
1390				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1391				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1392					togglefloating(NULL);
1393			}
1394			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1395				resize(c, c->x, c->y, nw, nh, True);
1396			break;
1397		}
1398	} while(ev.type != ButtonRelease);
1399	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1400	XUngrabPointer(dpy, CurrentTime);
1401	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1402	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1403		sendmon(c, m);
1404		selmon = m;
1405		focus(NULL);
1406	}
1407}
1408
1409void
1410restack(Monitor *m) {
1411	Client *c;
1412	XEvent ev;
1413	XWindowChanges wc;
1414
1415	drawbar(m);
1416	if(!m->sel)
1417		return;
1418	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1419		XRaiseWindow(dpy, m->sel->win);
1420	if(m->lt[m->sellt]->arrange) {
1421		wc.stack_mode = Below;
1422		wc.sibling = m->barwin;
1423		for(c = m->stack; c; c = c->snext)
1424			if(!c->isfloating && ISVISIBLE(c)) {
1425				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1426				wc.sibling = c->win;
1427			}
1428	}
1429	XSync(dpy, False);
1430	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1431}
1432
1433void
1434run(void) {
1435	XEvent ev;
1436	/* main event loop */
1437	XSync(dpy, False);
1438	while(running && !XNextEvent(dpy, &ev))
1439		if(handler[ev.type])
1440			handler[ev.type](&ev); /* call handler */
1441}
1442
1443void
1444scan(void) {
1445	unsigned int i, num;
1446	Window d1, d2, *wins = NULL;
1447	XWindowAttributes wa;
1448
1449	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1450		for(i = 0; i < num; i++) {
1451			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1452			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1453				continue;
1454			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1455				manage(wins[i], &wa);
1456		}
1457		for(i = 0; i < num; i++) { /* now the transients */
1458			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1459				continue;
1460			if(XGetTransientForHint(dpy, wins[i], &d1)
1461			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1462				manage(wins[i], &wa);
1463		}
1464		if(wins)
1465			XFree(wins);
1466	}
1467}
1468
1469void
1470sendmon(Client *c, Monitor *m) {
1471	if(c->mon == m)
1472		return;
1473	unfocus(c, True);
1474	detach(c);
1475	detachstack(c);
1476	c->mon = m;
1477	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1478	attach(c);
1479	attachstack(c);
1480	focus(NULL);
1481	arrange(NULL);
1482}
1483
1484void
1485setclientstate(Client *c, long state) {
1486	long data[] = { state, None };
1487
1488	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1489			PropModeReplace, (unsigned char *)data, 2);
1490}
1491
1492Bool
1493sendevent(Client *c, Atom proto) {
1494	int n;
1495	Atom *protocols;
1496	Bool exists = False;
1497	XEvent ev;
1498
1499	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1500		while(!exists && n--)
1501			exists = protocols[n] == proto;
1502		XFree(protocols);
1503	}
1504	if(exists) {
1505		ev.type = ClientMessage;
1506		ev.xclient.window = c->win;
1507		ev.xclient.message_type = wmatom[WMProtocols];
1508		ev.xclient.format = 32;
1509		ev.xclient.data.l[0] = proto;
1510		ev.xclient.data.l[1] = CurrentTime;
1511		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1512	}
1513	return exists;
1514}
1515
1516void
1517setfocus(Client *c) {
1518	if(!c->neverfocus) {
1519		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1520		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1521 		                XA_WINDOW, 32, PropModeReplace,
1522 		                (unsigned char *) &(c->win), 1);
1523	}
1524	sendevent(c, wmatom[WMTakeFocus]);
1525}
1526
1527void
1528setfullscreen(Client *c, Bool fullscreen) {
1529	if(fullscreen) {
1530		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1531		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1532		c->isfullscreen = True;
1533		c->oldstate = c->isfloating;
1534		c->oldbw = c->bw;
1535		c->bw = 0;
1536		c->isfloating = True;
1537		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1538		XRaiseWindow(dpy, c->win);
1539	}
1540	else {
1541		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1542		                PropModeReplace, (unsigned char*)0, 0);
1543		c->isfullscreen = False;
1544		c->isfloating = c->oldstate;
1545		c->bw = c->oldbw;
1546		c->x = c->oldx;
1547		c->y = c->oldy;
1548		c->w = c->oldw;
1549		c->h = c->oldh;
1550		resizeclient(c, c->x, c->y, c->w, c->h);
1551		arrange(c->mon);
1552	}
1553}
1554
1555void
1556setlayout(const Arg *arg) {
1557	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1558		selmon->sellt ^= 1;
1559	if(arg && arg->v)
1560		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1561	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1562	if(selmon->sel)
1563		arrange(selmon);
1564	else
1565		drawbar(selmon);
1566}
1567
1568/* arg > 1.0 will set mfact absolutly */
1569void
1570setmfact(const Arg *arg) {
1571	float f;
1572
1573	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1574		return;
1575	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1576	if(f < 0.1 || f > 0.9)
1577		return;
1578	selmon->mfact = f;
1579	arrange(selmon);
1580}
1581
1582void
1583setup(void) {
1584	XSetWindowAttributes wa;
1585	int dummy = 0, xkbmajor = XkbMajorVersion, xkbminor = XkbMinorVersion;
1586
1587	/* clean up any zombies immediately */
1588	sigchld(0);
1589
1590	/* init screen */
1591	screen = DefaultScreen(dpy);
1592	root = RootWindow(dpy, screen);
1593	initfont(font);
1594	sw = DisplayWidth(dpy, screen);
1595	sh = DisplayHeight(dpy, screen);
1596	bh = dc.h = dc.font.height + 2;
1597	updategeom();
1598	/* init atoms */
1599	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1600	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1601	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1602	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1603	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1604	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1605	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1606	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1607	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1608	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1609	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1610	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1611	/* init cursors */
1612	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1613	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1614	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1615	/* init appearance */
1616	dc.norm[ColBorder] = getcolor(normbordercolor);
1617	dc.norm[ColBG] = getcolor(normbgcolor);
1618	dc.norm[ColFG] = getcolor(normfgcolor);
1619	dc.sel[ColBorder] = getcolor(selbordercolor);
1620	dc.sel[ColBG] = getcolor(selbgcolor);
1621	dc.sel[ColFG] = getcolor(selfgcolor);
1622	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1623	dc.gc = XCreateGC(dpy, root, 0, NULL);
1624	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1625	/* init bars */
1626	updatebars();
1627	updatestatus();
1628	/* EWMH support per view */
1629	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1630			PropModeReplace, (unsigned char *) netatom, NetLast);
1631	XDeleteProperty(dpy, root, netatom[NetClientList]);
1632	/* select for events */
1633	wa.cursor = cursor[CurNormal];
1634	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1635	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1636	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1637	XSelectInput(dpy, root, wa.event_mask);
1638	/* init xkb */
1639	usexkb = XkbQueryExtension(dpy, &dummy, &dummy, &dummy, &xkb_major, &xkb_minor);
1640	grabkeys();
1641}
1642
1643void
1644showhide(Client *c) {
1645	if(!c)
1646		return;
1647	if(ISVISIBLE(c)) { /* show clients top down */
1648		XMoveWindow(dpy, c->win, c->x, c->y);
1649		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1650			resize(c, c->x, c->y, c->w, c->h, False);
1651		showhide(c->snext);
1652	}
1653	else { /* hide clients bottom up */
1654		showhide(c->snext);
1655		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1656	}
1657}
1658
1659void
1660sigchld(int unused) {
1661	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1662		die("Can't install SIGCHLD handler");
1663	while(0 < waitpid(-1, NULL, WNOHANG));
1664}
1665
1666void
1667spawn(const Arg *arg) {
1668	if(fork() == 0) {
1669		if(dpy)
1670			close(ConnectionNumber(dpy));
1671		setsid();
1672		execvp(((char **)arg->v)[0], (char **)arg->v);
1673		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1674		perror(" failed");
1675		exit(EXIT_SUCCESS);
1676	}
1677}
1678
1679void
1680tag(const Arg *arg) {
1681	if(selmon->sel && arg->ui & TAGMASK) {
1682		selmon->sel->tags = arg->ui & TAGMASK;
1683		focus(NULL);
1684		arrange(selmon);
1685	}
1686}
1687
1688void
1689tagmon(const Arg *arg) {
1690	if(!selmon->sel || !mons->next)
1691		return;
1692	sendmon(selmon->sel, dirtomon(arg->i));
1693}
1694
1695int
1696textnw(const char *text, unsigned int len) {
1697	XGlyphInfo ext;
1698	XftTextExtentsUtf8(dpy, dc.font.xfont, (XftChar8 *) text, len, &ext);
1699	return ext.xOff;
1700}
1701
1702void
1703tile(Monitor *m) {
1704	unsigned int i, n, h, mw, my, ty;
1705	Client *c;
1706
1707	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1708	if(n == 0)
1709		return;
1710
1711	if(n > m->nmaster)
1712		mw = m->nmaster ? m->ww * m->mfact : 0;
1713	else
1714		mw = m->ww;
1715	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1716		if(i < m->nmaster) {
1717			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1718			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1719			my += HEIGHT(c);
1720		}
1721		else {
1722			h = (m->wh - ty) / (n - i);
1723			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1724			ty += HEIGHT(c);
1725		}
1726}
1727
1728void
1729togglebar(const Arg *arg) {
1730	selmon->showbar = !selmon->showbar;
1731	updatebarpos(selmon);
1732	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1733	arrange(selmon);
1734}
1735
1736void
1737togglefloating(const Arg *arg) {
1738	if(!selmon->sel)
1739		return;
1740	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1741		return;
1742	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1743	if(selmon->sel->isfloating)
1744		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1745		       selmon->sel->w, selmon->sel->h, False);
1746	arrange(selmon);
1747}
1748
1749void
1750toggletag(const Arg *arg) {
1751	unsigned int newtags;
1752
1753	if(!selmon->sel)
1754		return;
1755	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1756	if(newtags) {
1757		selmon->sel->tags = newtags;
1758		focus(NULL);
1759		arrange(selmon);
1760	}
1761}
1762
1763void
1764toggleview(const Arg *arg) {
1765	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1766
1767	if(newtagset) {
1768		selmon->tagset[selmon->seltags] = newtagset;
1769		focus(NULL);
1770		arrange(selmon);
1771	}
1772}
1773
1774void
1775unfocus(Client *c, Bool setfocus) {
1776	if(!c)
1777		return;
1778	grabbuttons(c, False);
1779	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder].pixel);
1780	if(setfocus) {
1781		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1782		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1783	}
1784}
1785
1786void
1787unmanage(Client *c, Bool destroyed) {
1788	Monitor *m = c->mon;
1789	XWindowChanges wc;
1790
1791	/* The server grab construct avoids race conditions. */
1792	detach(c);
1793	detachstack(c);
1794	if(!destroyed) {
1795		wc.border_width = c->oldbw;
1796		XGrabServer(dpy);
1797		XSetErrorHandler(xerrordummy);
1798		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1799		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1800		setclientstate(c, WithdrawnState);
1801		XSync(dpy, False);
1802		XSetErrorHandler(xerror);
1803		XUngrabServer(dpy);
1804	}
1805	free(c);
1806	focus(NULL);
1807	updateclientlist();
1808	arrange(m);
1809}
1810
1811void
1812unmapnotify(XEvent *e) {
1813	Client *c;
1814	XUnmapEvent *ev = &e->xunmap;
1815
1816	if((c = wintoclient(ev->window))) {
1817		if(ev->send_event)
1818			setclientstate(c, WithdrawnState);
1819		else
1820			unmanage(c, False);
1821	}
1822}
1823
1824void
1825updatebars(void) {
1826	Monitor *m;
1827	XSetWindowAttributes wa = {
1828		.override_redirect = True,
1829		.background_pixmap = ParentRelative,
1830		.event_mask = ButtonPressMask|ExposureMask
1831	};
1832	for(m = mons; m; m = m->next) {
1833		if (m->barwin)
1834			continue;
1835		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1836		                          CopyFromParent, DefaultVisual(dpy, screen),
1837		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1838		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1839		XMapRaised(dpy, m->barwin);
1840	}
1841}
1842
1843void
1844updatebarpos(Monitor *m) {
1845	m->wy = m->my;
1846	m->wh = m->mh;
1847	if(m->showbar) {
1848		m->wh -= bh;
1849		m->by = m->topbar ? m->wy : m->wy + m->wh;
1850		m->wy = m->topbar ? m->wy + bh : m->wy;
1851	}
1852	else
1853		m->by = -bh;
1854}
1855
1856void
1857updateclientlist() {
1858	Client *c;
1859	Monitor *m;
1860
1861	XDeleteProperty(dpy, root, netatom[NetClientList]);
1862	for(m = mons; m; m = m->next)
1863		for(c = m->clients; c; c = c->next)
1864			XChangeProperty(dpy, root, netatom[NetClientList],
1865			                XA_WINDOW, 32, PropModeAppend,
1866			                (unsigned char *) &(c->win), 1);
1867}
1868
1869Bool
1870updategeom(void) {
1871	Bool dirty = False;
1872
1873#ifdef XINERAMA
1874	if(XineramaIsActive(dpy)) {
1875		int i, j, n, nn;
1876		Client *c;
1877		Monitor *m;
1878		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1879		XineramaScreenInfo *unique = NULL;
1880
1881		for(n = 0, m = mons; m; m = m->next, n++);
1882		/* only consider unique geometries as separate screens */
1883		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1884			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1885		for(i = 0, j = 0; i < nn; i++)
1886			if(isuniquegeom(unique, j, &info[i]))
1887				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1888		XFree(info);
1889		nn = j;
1890		if(n <= nn) {
1891			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1892				for(m = mons; m && m->next; m = m->next);
1893				if(m)
1894					m->next = createmon();
1895				else
1896					mons = createmon();
1897			}
1898			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1899				if(i >= n
1900				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1901				    || unique[i].width != m->mw || unique[i].height != m->mh))
1902				{
1903					dirty = True;
1904					m->num = i;
1905					m->mx = m->wx = unique[i].x_org;
1906					m->my = m->wy = unique[i].y_org;
1907					m->mw = m->ww = unique[i].width;
1908					m->mh = m->wh = unique[i].height;
1909					updatebarpos(m);
1910				}
1911		}
1912		else { /* less monitors available nn < n */
1913			for(i = nn; i < n; i++) {
1914				for(m = mons; m && m->next; m = m->next);
1915				while(m->clients) {
1916					dirty = True;
1917					c = m->clients;
1918					m->clients = c->next;
1919					detachstack(c);
1920					c->mon = mons;
1921					attach(c);
1922					attachstack(c);
1923				}
1924				if(m == selmon)
1925					selmon = mons;
1926				cleanupmon(m);
1927			}
1928		}
1929		free(unique);
1930	}
1931	else
1932#endif /* XINERAMA */
1933	/* default monitor setup */
1934	{
1935		if(!mons)
1936			mons = createmon();
1937		if(mons->mw != sw || mons->mh != sh) {
1938			dirty = True;
1939			mons->mw = mons->ww = sw;
1940			mons->mh = mons->wh = sh;
1941			updatebarpos(mons);
1942		}
1943	}
1944	if(dirty) {
1945		selmon = mons;
1946		selmon = wintomon(root);
1947	}
1948	return dirty;
1949}
1950
1951void
1952updatenumlockmask(void) {
1953	unsigned int i, j;
1954	XModifierKeymap *modmap;
1955
1956	numlockmask = 0;
1957	modmap = XGetModifierMapping(dpy);
1958	for(i = 0; i < 8; i++)
1959		for(j = 0; j < modmap->max_keypermod; j++)
1960			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1961			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1962				numlockmask = (1 << i);
1963	XFreeModifiermap(modmap);
1964}
1965
1966void
1967updatesizehints(Client *c) {
1968	long msize;
1969	XSizeHints size;
1970
1971	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1972		/* size is uninitialized, ensure that size.flags aren't used */
1973		size.flags = PSize;
1974	if(size.flags & PBaseSize) {
1975		c->basew = size.base_width;
1976		c->baseh = size.base_height;
1977	}
1978	else if(size.flags & PMinSize) {
1979		c->basew = size.min_width;
1980		c->baseh = size.min_height;
1981	}
1982	else
1983		c->basew = c->baseh = 0;
1984	if(size.flags & PResizeInc) {
1985		c->incw = size.width_inc;
1986		c->inch = size.height_inc;
1987	}
1988	else
1989		c->incw = c->inch = 0;
1990	if(size.flags & PMaxSize) {
1991		c->maxw = size.max_width;
1992		c->maxh = size.max_height;
1993	}
1994	else
1995		c->maxw = c->maxh = 0;
1996	if(size.flags & PMinSize) {
1997		c->minw = size.min_width;
1998		c->minh = size.min_height;
1999	}
2000	else if(size.flags & PBaseSize) {
2001		c->minw = size.base_width;
2002		c->minh = size.base_height;
2003	}
2004	else
2005		c->minw = c->minh = 0;
2006	if(size.flags & PAspect) {
2007		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2008		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2009	}
2010	else
2011		c->maxa = c->mina = 0.0;
2012	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2013	             && c->maxw == c->minw && c->maxh == c->minh);
2014}
2015
2016void
2017updatetitle(Client *c) {
2018	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2019		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2020	if(c->name[0] == '\0') /* hack to mark broken clients */
2021		strcpy(c->name, broken);
2022}
2023
2024void
2025updatestatus(void) {
2026	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2027		strcpy(stext, "dwm-"VERSION);
2028	drawbar(selmon);
2029}
2030
2031void
2032updatewindowtype(Client *c) {
2033	Atom state = getatomprop(c, netatom[NetWMState]);
2034	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2035
2036	if(state == netatom[NetWMFullscreen])
2037		setfullscreen(c, True);
2038	if(wtype == netatom[NetWMWindowTypeDialog])
2039		c->isfloating = True;
2040}
2041
2042void
2043updatewmhints(Client *c) {
2044	XWMHints *wmh;
2045
2046	if((wmh = XGetWMHints(dpy, c->win))) {
2047		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2048			wmh->flags &= ~XUrgencyHint;
2049			XSetWMHints(dpy, c->win, wmh);
2050		}
2051		else
2052			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2053		if(wmh->flags & InputHint)
2054			c->neverfocus = !wmh->input;
2055		else
2056			c->neverfocus = False;
2057		XFree(wmh);
2058	}
2059}
2060
2061void
2062view(const Arg *arg) {
2063	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2064		return;
2065	selmon->seltags ^= 1; /* toggle sel tagset */
2066	if(arg->ui & TAGMASK)
2067		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2068	focus(NULL);
2069	arrange(selmon);
2070}
2071
2072Client *
2073wintoclient(Window w) {
2074	Client *c;
2075	Monitor *m;
2076
2077	for(m = mons; m; m = m->next)
2078		for(c = m->clients; c; c = c->next)
2079			if(c->win == w)
2080				return c;
2081	return NULL;
2082}
2083
2084Monitor *
2085wintomon(Window w) {
2086	int x, y;
2087	Client *c;
2088	Monitor *m;
2089
2090	if(w == root && getrootptr(&x, &y))
2091		return recttomon(x, y, 1, 1);
2092	for(m = mons; m; m = m->next)
2093		if(w == m->barwin)
2094			return m;
2095	if((c = wintoclient(w)))
2096		return c->mon;
2097	return selmon;
2098}
2099
2100/* There's no way to check accesses to destroyed windows, thus those cases are
2101 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2102 * default error handler, which may call exit.  */
2103int
2104xerror(Display *dpy, XErrorEvent *ee) {
2105	if(ee->error_code == BadWindow
2106	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2107	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2108	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2109	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2110	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2111	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2112	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2113	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2114		return 0;
2115	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2116			ee->request_code, ee->error_code);
2117	return xerrorxlib(dpy, ee); /* may call exit */
2118}
2119
2120int
2121xerrordummy(Display *dpy, XErrorEvent *ee) {
2122	return 0;
2123}
2124
2125/* Startup Error handler to check if another window manager
2126 * is already running. */
2127int
2128xerrorstart(Display *dpy, XErrorEvent *ee) {
2129	die("dwm: another window manager is already running\n");
2130	return -1;
2131}
2132
2133void
2134zoom(const Arg *arg) {
2135	Client *c = selmon->sel;
2136
2137	if(!selmon->lt[selmon->sellt]->arrange
2138	|| (selmon->sel && selmon->sel->isfloating))
2139		return;
2140	if(c == nexttiled(selmon->clients))
2141		if(!c || !(c = nexttiled(c->next)))
2142			return;
2143	pop(c);
2144}
2145
2146int
2147main(int argc, char *argv[]) {
2148	if(argc == 2 && !strcmp("-v", argv[1]))
2149		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2150	else if(argc != 1)
2151		die("usage: dwm [-v]\n");
2152	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2153		fputs("warning: no locale support\n", stderr);
2154	if(!(dpy = XOpenDisplay(NULL)))
2155		die("dwm: cannot open display\n");
2156	checkotherwm();
2157	setup();
2158	scan();
2159	run();
2160	cleanup();
2161	XCloseDisplay(dpy);
2162	return EXIT_SUCCESS;
2163}