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;
 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	keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1073	for(i = 0; i < LENGTH(keys); i++)
1074		if(keysym == keys[i].keysym
1075		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1076		&& keys[i].func)
1077			keys[i].func(&(keys[i].arg));
1078}
1079
1080void
1081killclient(const Arg *arg) {
1082	if(!selmon->sel)
1083		return;
1084	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1085		XGrabServer(dpy);
1086		XSetErrorHandler(xerrordummy);
1087		XSetCloseDownMode(dpy, DestroyAll);
1088		XKillClient(dpy, selmon->sel->win);
1089		XSync(dpy, False);
1090		XSetErrorHandler(xerror);
1091		XUngrabServer(dpy);
1092	}
1093}
1094
1095void
1096manage(Window w, XWindowAttributes *wa) {
1097	Client *c, *t = NULL;
1098	Window trans = None;
1099	XWindowChanges wc;
1100
1101	if(!(c = calloc(1, sizeof(Client))))
1102		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1103	c->win = w;
1104	updatetitle(c);
1105	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1106		c->mon = t->mon;
1107		c->tags = t->tags;
1108	}
1109	else {
1110		c->mon = selmon;
1111		applyrules(c);
1112	}
1113	/* geometry */
1114	c->x = c->oldx = wa->x;
1115	c->y = c->oldy = wa->y;
1116	c->w = c->oldw = wa->width;
1117	c->h = c->oldh = wa->height;
1118	c->oldbw = wa->border_width;
1119
1120	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1121		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1122	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1123		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1124	c->x = MAX(c->x, c->mon->mx);
1125	/* only fix client y-offset, if the client center might cover the bar */
1126	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1127	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1128	c->bw = borderpx;
1129
1130	wc.border_width = c->bw;
1131	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1132	XSetWindowBorder(dpy, w, dc.norm[ColBorder].pixel);
1133	configure(c); /* propagates border_width, if size doesn't change */
1134	updatewindowtype(c);
1135	updatesizehints(c);
1136	updatewmhints(c);
1137	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1138	grabbuttons(c, False);
1139	if(!c->isfloating)
1140		c->isfloating = c->oldstate = trans != None || c->isfixed;
1141	if(c->isfloating)
1142		XRaiseWindow(dpy, c->win);
1143	attach(c);
1144	attachstack(c);
1145	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1146	                (unsigned char *) &(c->win), 1);
1147	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1148	setclientstate(c, NormalState);
1149	if (c->mon == selmon)
1150		unfocus(selmon->sel, False);
1151	c->mon->sel = c;
1152	arrange(c->mon);
1153	XMapWindow(dpy, c->win);
1154	focus(NULL);
1155}
1156
1157void
1158mappingnotify(XEvent *e) {
1159	XMappingEvent *ev = &e->xmapping;
1160
1161	XRefreshKeyboardMapping(ev);
1162	if(ev->request == MappingKeyboard)
1163		grabkeys();
1164}
1165
1166void
1167maprequest(XEvent *e) {
1168	static XWindowAttributes wa;
1169	XMapRequestEvent *ev = &e->xmaprequest;
1170
1171	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1172		return;
1173	if(wa.override_redirect)
1174		return;
1175	if(!wintoclient(ev->window))
1176		manage(ev->window, &wa);
1177}
1178
1179void
1180monocle(Monitor *m) {
1181	unsigned int n = 0;
1182	Client *c;
1183
1184	for(c = m->clients; c; c = c->next)
1185		if(ISVISIBLE(c))
1186			n++;
1187	if(n > 0) /* override layout symbol */
1188		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1189	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1190		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1191}
1192
1193void
1194motionnotify(XEvent *e) {
1195	static Monitor *mon = NULL;
1196	Monitor *m;
1197	XMotionEvent *ev = &e->xmotion;
1198
1199	if(ev->window != root)
1200		return;
1201	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1202		unfocus(selmon->sel, True);
1203		selmon = m;
1204		focus(NULL);
1205	}
1206	mon = m;
1207}
1208
1209void
1210movemouse(const Arg *arg) {
1211	int x, y, ocx, ocy, nx, ny;
1212	Client *c;
1213	Monitor *m;
1214	XEvent ev;
1215
1216	if(!(c = selmon->sel))
1217		return;
1218	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1219		return;
1220	restack(selmon);
1221	ocx = c->x;
1222	ocy = c->y;
1223	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1224	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1225		return;
1226	if(!getrootptr(&x, &y))
1227		return;
1228	do {
1229		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1230		switch(ev.type) {
1231		case ConfigureRequest:
1232		case Expose:
1233		case MapRequest:
1234			handler[ev.type](&ev);
1235			break;
1236		case MotionNotify:
1237			nx = ocx + (ev.xmotion.x - x);
1238			ny = ocy + (ev.xmotion.y - y);
1239			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1240			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1241				if(abs(selmon->wx - nx) < snap)
1242					nx = selmon->wx;
1243				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1244					nx = selmon->wx + selmon->ww - WIDTH(c);
1245				if(abs(selmon->wy - ny) < snap)
1246					ny = selmon->wy;
1247				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1248					ny = selmon->wy + selmon->wh - HEIGHT(c);
1249				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1250				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1251					togglefloating(NULL);
1252			}
1253			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1254				resize(c, nx, ny, c->w, c->h, True);
1255			break;
1256		}
1257	} while(ev.type != ButtonRelease);
1258	XUngrabPointer(dpy, CurrentTime);
1259	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1260		sendmon(c, m);
1261		selmon = m;
1262		focus(NULL);
1263	}
1264}
1265
1266Client *
1267nexttiled(Client *c) {
1268	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1269	return c;
1270}
1271
1272void
1273pop(Client *c) {
1274	detach(c);
1275	attach(c);
1276	focus(c);
1277	arrange(c->mon);
1278}
1279
1280void
1281propertynotify(XEvent *e) {
1282	Client *c;
1283	Window trans;
1284	XPropertyEvent *ev = &e->xproperty;
1285
1286	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1287		updatestatus();
1288	else if(ev->state == PropertyDelete)
1289		return; /* ignore */
1290	else if((c = wintoclient(ev->window))) {
1291		switch(ev->atom) {
1292		default: break;
1293		case XA_WM_TRANSIENT_FOR:
1294			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1295			   (c->isfloating = (wintoclient(trans)) != NULL))
1296				arrange(c->mon);
1297			break;
1298		case XA_WM_NORMAL_HINTS:
1299			updatesizehints(c);
1300			break;
1301		case XA_WM_HINTS:
1302			updatewmhints(c);
1303			drawbars();
1304			break;
1305		}
1306		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1307			updatetitle(c);
1308			if(c == c->mon->sel)
1309				drawbar(c->mon);
1310		}
1311		if(ev->atom == netatom[NetWMWindowType])
1312			updatewindowtype(c);
1313	}
1314}
1315
1316void
1317quit(const Arg *arg) {
1318	running = False;
1319}
1320
1321Monitor *
1322recttomon(int x, int y, int w, int h) {
1323	Monitor *m, *r = selmon;
1324	int a, area = 0;
1325
1326	for(m = mons; m; m = m->next)
1327		if((a = INTERSECT(x, y, w, h, m)) > area) {
1328			area = a;
1329			r = m;
1330		}
1331	return r;
1332}
1333
1334void
1335resize(Client *c, int x, int y, int w, int h, Bool interact) {
1336	if(applysizehints(c, &x, &y, &w, &h, interact))
1337		resizeclient(c, x, y, w, h);
1338}
1339
1340void
1341resizeclient(Client *c, int x, int y, int w, int h) {
1342	XWindowChanges wc;
1343
1344	c->oldx = c->x; c->x = wc.x = x;
1345	c->oldy = c->y; c->y = wc.y = y;
1346	c->oldw = c->w; c->w = wc.width = w;
1347	c->oldh = c->h; c->h = wc.height = h;
1348	wc.border_width = c->bw;
1349	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1350	configure(c);
1351	XSync(dpy, False);
1352}
1353
1354void
1355resizemouse(const Arg *arg) {
1356	int ocx, ocy;
1357	int nw, nh;
1358	Client *c;
1359	Monitor *m;
1360	XEvent ev;
1361
1362	if(!(c = selmon->sel))
1363		return;
1364	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1365		return;
1366	restack(selmon);
1367	ocx = c->x;
1368	ocy = c->y;
1369	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1370	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1371		return;
1372	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1373	do {
1374		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1375		switch(ev.type) {
1376		case ConfigureRequest:
1377		case Expose:
1378		case MapRequest:
1379			handler[ev.type](&ev);
1380			break;
1381		case MotionNotify:
1382			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1383			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1384			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1385			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1386			{
1387				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1388				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1389					togglefloating(NULL);
1390			}
1391			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1392				resize(c, c->x, c->y, nw, nh, True);
1393			break;
1394		}
1395	} while(ev.type != ButtonRelease);
1396	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1397	XUngrabPointer(dpy, CurrentTime);
1398	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1399	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1400		sendmon(c, m);
1401		selmon = m;
1402		focus(NULL);
1403	}
1404}
1405
1406void
1407restack(Monitor *m) {
1408	Client *c;
1409	XEvent ev;
1410	XWindowChanges wc;
1411
1412	drawbar(m);
1413	if(!m->sel)
1414		return;
1415	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1416		XRaiseWindow(dpy, m->sel->win);
1417	if(m->lt[m->sellt]->arrange) {
1418		wc.stack_mode = Below;
1419		wc.sibling = m->barwin;
1420		for(c = m->stack; c; c = c->snext)
1421			if(!c->isfloating && ISVISIBLE(c)) {
1422				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1423				wc.sibling = c->win;
1424			}
1425	}
1426	XSync(dpy, False);
1427	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1428}
1429
1430void
1431run(void) {
1432	XEvent ev;
1433	/* main event loop */
1434	XSync(dpy, False);
1435	while(running && !XNextEvent(dpy, &ev))
1436		if(handler[ev.type])
1437			handler[ev.type](&ev); /* call handler */
1438}
1439
1440void
1441scan(void) {
1442	unsigned int i, num;
1443	Window d1, d2, *wins = NULL;
1444	XWindowAttributes wa;
1445
1446	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1447		for(i = 0; i < num; i++) {
1448			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1449			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1450				continue;
1451			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1452				manage(wins[i], &wa);
1453		}
1454		for(i = 0; i < num; i++) { /* now the transients */
1455			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1456				continue;
1457			if(XGetTransientForHint(dpy, wins[i], &d1)
1458			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1459				manage(wins[i], &wa);
1460		}
1461		if(wins)
1462			XFree(wins);
1463	}
1464}
1465
1466void
1467sendmon(Client *c, Monitor *m) {
1468	if(c->mon == m)
1469		return;
1470	unfocus(c, True);
1471	detach(c);
1472	detachstack(c);
1473	c->mon = m;
1474	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1475	attach(c);
1476	attachstack(c);
1477	focus(NULL);
1478	arrange(NULL);
1479}
1480
1481void
1482setclientstate(Client *c, long state) {
1483	long data[] = { state, None };
1484
1485	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1486			PropModeReplace, (unsigned char *)data, 2);
1487}
1488
1489Bool
1490sendevent(Client *c, Atom proto) {
1491	int n;
1492	Atom *protocols;
1493	Bool exists = False;
1494	XEvent ev;
1495
1496	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1497		while(!exists && n--)
1498			exists = protocols[n] == proto;
1499		XFree(protocols);
1500	}
1501	if(exists) {
1502		ev.type = ClientMessage;
1503		ev.xclient.window = c->win;
1504		ev.xclient.message_type = wmatom[WMProtocols];
1505		ev.xclient.format = 32;
1506		ev.xclient.data.l[0] = proto;
1507		ev.xclient.data.l[1] = CurrentTime;
1508		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1509	}
1510	return exists;
1511}
1512
1513void
1514setfocus(Client *c) {
1515	if(!c->neverfocus) {
1516		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1517		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1518 		                XA_WINDOW, 32, PropModeReplace,
1519 		                (unsigned char *) &(c->win), 1);
1520	}
1521	sendevent(c, wmatom[WMTakeFocus]);
1522}
1523
1524void
1525setfullscreen(Client *c, Bool fullscreen) {
1526	if(fullscreen) {
1527		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1528		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1529		c->isfullscreen = True;
1530		c->oldstate = c->isfloating;
1531		c->oldbw = c->bw;
1532		c->bw = 0;
1533		c->isfloating = True;
1534		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1535		XRaiseWindow(dpy, c->win);
1536	}
1537	else {
1538		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1539		                PropModeReplace, (unsigned char*)0, 0);
1540		c->isfullscreen = False;
1541		c->isfloating = c->oldstate;
1542		c->bw = c->oldbw;
1543		c->x = c->oldx;
1544		c->y = c->oldy;
1545		c->w = c->oldw;
1546		c->h = c->oldh;
1547		resizeclient(c, c->x, c->y, c->w, c->h);
1548		arrange(c->mon);
1549	}
1550}
1551
1552void
1553setlayout(const Arg *arg) {
1554	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1555		selmon->sellt ^= 1;
1556	if(arg && arg->v)
1557		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1558	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1559	if(selmon->sel)
1560		arrange(selmon);
1561	else
1562		drawbar(selmon);
1563}
1564
1565/* arg > 1.0 will set mfact absolutly */
1566void
1567setmfact(const Arg *arg) {
1568	float f;
1569
1570	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1571		return;
1572	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1573	if(f < 0.1 || f > 0.9)
1574		return;
1575	selmon->mfact = f;
1576	arrange(selmon);
1577}
1578
1579void
1580setup(void) {
1581	XSetWindowAttributes wa;
1582
1583	/* clean up any zombies immediately */
1584	sigchld(0);
1585
1586	/* init screen */
1587	screen = DefaultScreen(dpy);
1588	root = RootWindow(dpy, screen);
1589	initfont(font);
1590	sw = DisplayWidth(dpy, screen);
1591	sh = DisplayHeight(dpy, screen);
1592	bh = dc.h = dc.font.height + 2;
1593	updategeom();
1594	/* init atoms */
1595	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1596	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1597	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1598	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1599	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1600	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1601	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1602	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1603	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1604	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1605	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1606	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1607	/* init cursors */
1608	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1609	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1610	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1611	/* init appearance */
1612	dc.norm[ColBorder] = getcolor(normbordercolor);
1613	dc.norm[ColBG] = getcolor(normbgcolor);
1614	dc.norm[ColFG] = getcolor(normfgcolor);
1615	dc.sel[ColBorder] = getcolor(selbordercolor);
1616	dc.sel[ColBG] = getcolor(selbgcolor);
1617	dc.sel[ColFG] = getcolor(selfgcolor);
1618	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1619	dc.gc = XCreateGC(dpy, root, 0, NULL);
1620	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1621	/* init bars */
1622	updatebars();
1623	updatestatus();
1624	/* EWMH support per view */
1625	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1626			PropModeReplace, (unsigned char *) netatom, NetLast);
1627	XDeleteProperty(dpy, root, netatom[NetClientList]);
1628	/* select for events */
1629	wa.cursor = cursor[CurNormal];
1630	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1631	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1632	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1633	XSelectInput(dpy, root, wa.event_mask);
1634	grabkeys();
1635}
1636
1637void
1638showhide(Client *c) {
1639	if(!c)
1640		return;
1641	if(ISVISIBLE(c)) { /* show clients top down */
1642		XMoveWindow(dpy, c->win, c->x, c->y);
1643		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1644			resize(c, c->x, c->y, c->w, c->h, False);
1645		showhide(c->snext);
1646	}
1647	else { /* hide clients bottom up */
1648		showhide(c->snext);
1649		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1650	}
1651}
1652
1653void
1654sigchld(int unused) {
1655	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1656		die("Can't install SIGCHLD handler");
1657	while(0 < waitpid(-1, NULL, WNOHANG));
1658}
1659
1660void
1661spawn(const Arg *arg) {
1662	if(fork() == 0) {
1663		if(dpy)
1664			close(ConnectionNumber(dpy));
1665		setsid();
1666		execvp(((char **)arg->v)[0], (char **)arg->v);
1667		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1668		perror(" failed");
1669		exit(EXIT_SUCCESS);
1670	}
1671}
1672
1673void
1674tag(const Arg *arg) {
1675	if(selmon->sel && arg->ui & TAGMASK) {
1676		selmon->sel->tags = arg->ui & TAGMASK;
1677		focus(NULL);
1678		arrange(selmon);
1679	}
1680}
1681
1682void
1683tagmon(const Arg *arg) {
1684	if(!selmon->sel || !mons->next)
1685		return;
1686	sendmon(selmon->sel, dirtomon(arg->i));
1687}
1688
1689int
1690textnw(const char *text, unsigned int len) {
1691	XGlyphInfo ext;
1692	XftTextExtentsUtf8(dpy, dc.font.xfont, (XftChar8 *) text, len, &ext);
1693	return ext.xOff;
1694}
1695
1696void
1697tile(Monitor *m) {
1698	unsigned int i, n, h, mw, my, ty;
1699	Client *c;
1700
1701	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1702	if(n == 0)
1703		return;
1704
1705	if(n > m->nmaster)
1706		mw = m->nmaster ? m->ww * m->mfact : 0;
1707	else
1708		mw = m->ww;
1709	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1710		if(i < m->nmaster) {
1711			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1712			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1713			my += HEIGHT(c);
1714		}
1715		else {
1716			h = (m->wh - ty) / (n - i);
1717			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1718			ty += HEIGHT(c);
1719		}
1720}
1721
1722void
1723togglebar(const Arg *arg) {
1724	selmon->showbar = !selmon->showbar;
1725	updatebarpos(selmon);
1726	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1727	arrange(selmon);
1728}
1729
1730void
1731togglefloating(const Arg *arg) {
1732	if(!selmon->sel)
1733		return;
1734	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1735		return;
1736	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1737	if(selmon->sel->isfloating)
1738		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1739		       selmon->sel->w, selmon->sel->h, False);
1740	arrange(selmon);
1741}
1742
1743void
1744toggletag(const Arg *arg) {
1745	unsigned int newtags;
1746
1747	if(!selmon->sel)
1748		return;
1749	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1750	if(newtags) {
1751		selmon->sel->tags = newtags;
1752		focus(NULL);
1753		arrange(selmon);
1754	}
1755}
1756
1757void
1758toggleview(const Arg *arg) {
1759	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1760
1761	if(newtagset) {
1762		selmon->tagset[selmon->seltags] = newtagset;
1763		focus(NULL);
1764		arrange(selmon);
1765	}
1766}
1767
1768void
1769unfocus(Client *c, Bool setfocus) {
1770	if(!c)
1771		return;
1772	grabbuttons(c, False);
1773	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder].pixel);
1774	if(setfocus) {
1775		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1776		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1777	}
1778}
1779
1780void
1781unmanage(Client *c, Bool destroyed) {
1782	Monitor *m = c->mon;
1783	XWindowChanges wc;
1784
1785	/* The server grab construct avoids race conditions. */
1786	detach(c);
1787	detachstack(c);
1788	if(!destroyed) {
1789		wc.border_width = c->oldbw;
1790		XGrabServer(dpy);
1791		XSetErrorHandler(xerrordummy);
1792		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1793		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1794		setclientstate(c, WithdrawnState);
1795		XSync(dpy, False);
1796		XSetErrorHandler(xerror);
1797		XUngrabServer(dpy);
1798	}
1799	free(c);
1800	focus(NULL);
1801	updateclientlist();
1802	arrange(m);
1803}
1804
1805void
1806unmapnotify(XEvent *e) {
1807	Client *c;
1808	XUnmapEvent *ev = &e->xunmap;
1809
1810	if((c = wintoclient(ev->window))) {
1811		if(ev->send_event)
1812			setclientstate(c, WithdrawnState);
1813		else
1814			unmanage(c, False);
1815	}
1816}
1817
1818void
1819updatebars(void) {
1820	Monitor *m;
1821	XSetWindowAttributes wa = {
1822		.override_redirect = True,
1823		.background_pixmap = ParentRelative,
1824		.event_mask = ButtonPressMask|ExposureMask
1825	};
1826	for(m = mons; m; m = m->next) {
1827		if (m->barwin)
1828			continue;
1829		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1830		                          CopyFromParent, DefaultVisual(dpy, screen),
1831		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1832		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1833		XMapRaised(dpy, m->barwin);
1834	}
1835}
1836
1837void
1838updatebarpos(Monitor *m) {
1839	m->wy = m->my;
1840	m->wh = m->mh;
1841	if(m->showbar) {
1842		m->wh -= bh;
1843		m->by = m->topbar ? m->wy : m->wy + m->wh;
1844		m->wy = m->topbar ? m->wy + bh : m->wy;
1845	}
1846	else
1847		m->by = -bh;
1848}
1849
1850void
1851updateclientlist() {
1852	Client *c;
1853	Monitor *m;
1854
1855	XDeleteProperty(dpy, root, netatom[NetClientList]);
1856	for(m = mons; m; m = m->next)
1857		for(c = m->clients; c; c = c->next)
1858			XChangeProperty(dpy, root, netatom[NetClientList],
1859			                XA_WINDOW, 32, PropModeAppend,
1860			                (unsigned char *) &(c->win), 1);
1861}
1862
1863Bool
1864updategeom(void) {
1865	Bool dirty = False;
1866
1867#ifdef XINERAMA
1868	if(XineramaIsActive(dpy)) {
1869		int i, j, n, nn;
1870		Client *c;
1871		Monitor *m;
1872		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1873		XineramaScreenInfo *unique = NULL;
1874
1875		for(n = 0, m = mons; m; m = m->next, n++);
1876		/* only consider unique geometries as separate screens */
1877		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1878			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1879		for(i = 0, j = 0; i < nn; i++)
1880			if(isuniquegeom(unique, j, &info[i]))
1881				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1882		XFree(info);
1883		nn = j;
1884		if(n <= nn) {
1885			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1886				for(m = mons; m && m->next; m = m->next);
1887				if(m)
1888					m->next = createmon();
1889				else
1890					mons = createmon();
1891			}
1892			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1893				if(i >= n
1894				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1895				    || unique[i].width != m->mw || unique[i].height != m->mh))
1896				{
1897					dirty = True;
1898					m->num = i;
1899					m->mx = m->wx = unique[i].x_org;
1900					m->my = m->wy = unique[i].y_org;
1901					m->mw = m->ww = unique[i].width;
1902					m->mh = m->wh = unique[i].height;
1903					updatebarpos(m);
1904				}
1905		}
1906		else { /* less monitors available nn < n */
1907			for(i = nn; i < n; i++) {
1908				for(m = mons; m && m->next; m = m->next);
1909				while(m->clients) {
1910					dirty = True;
1911					c = m->clients;
1912					m->clients = c->next;
1913					detachstack(c);
1914					c->mon = mons;
1915					attach(c);
1916					attachstack(c);
1917				}
1918				if(m == selmon)
1919					selmon = mons;
1920				cleanupmon(m);
1921			}
1922		}
1923		free(unique);
1924	}
1925	else
1926#endif /* XINERAMA */
1927	/* default monitor setup */
1928	{
1929		if(!mons)
1930			mons = createmon();
1931		if(mons->mw != sw || mons->mh != sh) {
1932			dirty = True;
1933			mons->mw = mons->ww = sw;
1934			mons->mh = mons->wh = sh;
1935			updatebarpos(mons);
1936		}
1937	}
1938	if(dirty) {
1939		selmon = mons;
1940		selmon = wintomon(root);
1941	}
1942	return dirty;
1943}
1944
1945void
1946updatenumlockmask(void) {
1947	unsigned int i, j;
1948	XModifierKeymap *modmap;
1949
1950	numlockmask = 0;
1951	modmap = XGetModifierMapping(dpy);
1952	for(i = 0; i < 8; i++)
1953		for(j = 0; j < modmap->max_keypermod; j++)
1954			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1955			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1956				numlockmask = (1 << i);
1957	XFreeModifiermap(modmap);
1958}
1959
1960void
1961updatesizehints(Client *c) {
1962	long msize;
1963	XSizeHints size;
1964
1965	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1966		/* size is uninitialized, ensure that size.flags aren't used */
1967		size.flags = PSize;
1968	if(size.flags & PBaseSize) {
1969		c->basew = size.base_width;
1970		c->baseh = size.base_height;
1971	}
1972	else if(size.flags & PMinSize) {
1973		c->basew = size.min_width;
1974		c->baseh = size.min_height;
1975	}
1976	else
1977		c->basew = c->baseh = 0;
1978	if(size.flags & PResizeInc) {
1979		c->incw = size.width_inc;
1980		c->inch = size.height_inc;
1981	}
1982	else
1983		c->incw = c->inch = 0;
1984	if(size.flags & PMaxSize) {
1985		c->maxw = size.max_width;
1986		c->maxh = size.max_height;
1987	}
1988	else
1989		c->maxw = c->maxh = 0;
1990	if(size.flags & PMinSize) {
1991		c->minw = size.min_width;
1992		c->minh = size.min_height;
1993	}
1994	else if(size.flags & PBaseSize) {
1995		c->minw = size.base_width;
1996		c->minh = size.base_height;
1997	}
1998	else
1999		c->minw = c->minh = 0;
2000	if(size.flags & PAspect) {
2001		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2002		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2003	}
2004	else
2005		c->maxa = c->mina = 0.0;
2006	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2007	             && c->maxw == c->minw && c->maxh == c->minh);
2008}
2009
2010void
2011updatetitle(Client *c) {
2012	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2013		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2014	if(c->name[0] == '\0') /* hack to mark broken clients */
2015		strcpy(c->name, broken);
2016}
2017
2018void
2019updatestatus(void) {
2020	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2021		strcpy(stext, "dwm-"VERSION);
2022	drawbar(selmon);
2023}
2024
2025void
2026updatewindowtype(Client *c) {
2027	Atom state = getatomprop(c, netatom[NetWMState]);
2028	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2029
2030	if(state == netatom[NetWMFullscreen])
2031		setfullscreen(c, True);
2032	if(wtype == netatom[NetWMWindowTypeDialog])
2033		c->isfloating = True;
2034}
2035
2036void
2037updatewmhints(Client *c) {
2038	XWMHints *wmh;
2039
2040	if((wmh = XGetWMHints(dpy, c->win))) {
2041		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2042			wmh->flags &= ~XUrgencyHint;
2043			XSetWMHints(dpy, c->win, wmh);
2044		}
2045		else
2046			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2047		if(wmh->flags & InputHint)
2048			c->neverfocus = !wmh->input;
2049		else
2050			c->neverfocus = False;
2051		XFree(wmh);
2052	}
2053}
2054
2055void
2056view(const Arg *arg) {
2057	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2058		return;
2059	selmon->seltags ^= 1; /* toggle sel tagset */
2060	if(arg->ui & TAGMASK)
2061		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2062	focus(NULL);
2063	arrange(selmon);
2064}
2065
2066Client *
2067wintoclient(Window w) {
2068	Client *c;
2069	Monitor *m;
2070
2071	for(m = mons; m; m = m->next)
2072		for(c = m->clients; c; c = c->next)
2073			if(c->win == w)
2074				return c;
2075	return NULL;
2076}
2077
2078Monitor *
2079wintomon(Window w) {
2080	int x, y;
2081	Client *c;
2082	Monitor *m;
2083
2084	if(w == root && getrootptr(&x, &y))
2085		return recttomon(x, y, 1, 1);
2086	for(m = mons; m; m = m->next)
2087		if(w == m->barwin)
2088			return m;
2089	if((c = wintoclient(w)))
2090		return c->mon;
2091	return selmon;
2092}
2093
2094/* There's no way to check accesses to destroyed windows, thus those cases are
2095 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2096 * default error handler, which may call exit.  */
2097int
2098xerror(Display *dpy, XErrorEvent *ee) {
2099	if(ee->error_code == BadWindow
2100	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2101	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2102	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2103	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2104	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2105	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2106	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2107	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2108		return 0;
2109	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2110			ee->request_code, ee->error_code);
2111	return xerrorxlib(dpy, ee); /* may call exit */
2112}
2113
2114int
2115xerrordummy(Display *dpy, XErrorEvent *ee) {
2116	return 0;
2117}
2118
2119/* Startup Error handler to check if another window manager
2120 * is already running. */
2121int
2122xerrorstart(Display *dpy, XErrorEvent *ee) {
2123	die("dwm: another window manager is already running\n");
2124	return -1;
2125}
2126
2127void
2128zoom(const Arg *arg) {
2129	Client *c = selmon->sel;
2130
2131	if(!selmon->lt[selmon->sellt]->arrange
2132	|| (selmon->sel && selmon->sel->isfloating))
2133		return;
2134	if(c == nexttiled(selmon->clients))
2135		if(!c || !(c = nexttiled(c->next)))
2136			return;
2137	pop(c);
2138}
2139
2140int
2141main(int argc, char *argv[]) {
2142	if(argc == 2 && !strcmp("-v", argv[1]))
2143		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2144	else if(argc != 1)
2145		die("usage: dwm [-v]\n");
2146	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2147		fputs("warning: no locale support\n", stderr);
2148	if(!(dpy = XOpenDisplay(NULL)))
2149		die("dwm: cannot open display\n");
2150	checkotherwm();
2151	setup();
2152	scan();
2153	run();
2154	cleanup();
2155	XCloseDisplay(dpy);
2156	return EXIT_SUCCESS;
2157}