1/* See LICENSE file for copyright and license details.
   2 *
   3 * dynamic window manager is designed like any other X client as well. It is
   4 * driven through handling X events. In contrast to other X clients, a window
   5 * manager selects for SubstructureRedirectMask on the root window, to receive
   6 * events about window (dis-)appearance.  Only one X connection at a time is
   7 * allowed to select for this event mask.
   8 *
   9 * The event handlers of dwm are organized in an array which is accessed
  10 * whenever a new event has been fetched. This allows event dispatching
  11 * in O(1) time.
  12 *
  13 * Each child of the root window is called a client, except windows which have
  14 * set the override_redirect flag.  Clients are organized in a linked client
  15 * list on each monitor, the focus history is remembered through a stack list
  16 * on each monitor. Each client contains a bit array to indicate the tags of a
  17 * client.
  18 *
  19 * Keys and tagging rules are organized as arrays and defined in config.h.
  20 *
  21 * To understand everything else, start reading main().
  22 */
  23#include <errno.h>
  24#include <locale.h>
  25#include <stdarg.h>
  26#include <signal.h>
  27#include <stdio.h>
  28#include <stdlib.h>
  29#include <string.h>
  30#include <unistd.h>
  31#include <sys/types.h>
  32#include <sys/wait.h>
  33#include <X11/cursorfont.h>
  34#include <X11/keysym.h>
  35#include <X11/Xatom.h>
  36#include <X11/Xlib.h>
  37#include <X11/Xproto.h>
  38#include <X11/Xutil.h>
  39#ifdef XINERAMA
  40#include <X11/extensions/Xinerama.h>
  41#endif /* XINERAMA */
  42
  43/* macros */
  44#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49#define LENGTH(X)               (sizeof X / sizeof X[0])
  50#define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51#define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58/* enums */
  59enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61enum { NetSupported, NetWMName, NetWMState,
  62       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63       NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  64enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68typedef union {
  69	int i;
  70	unsigned int ui;
  71	float f;
  72	const void *v;
  73} Arg;
  74
  75typedef struct {
  76	unsigned int click;
  77	unsigned int mask;
  78	unsigned int button;
  79	void (*func)(const Arg *arg);
  80	const Arg arg;
  81} Button;
  82
  83typedef struct Monitor Monitor;
  84typedef struct Client Client;
  85struct Client {
  86	char name[256];
  87	float mina, maxa;
  88	int x, y, w, h;
  89	int oldx, oldy, oldw, oldh;
  90	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91	int bw, oldbw;
  92	unsigned int tags;
  93	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94	Client *next;
  95	Client *snext;
  96	Monitor *mon;
  97	Window win;
  98};
  99
 100typedef struct {
 101	int x, y, w, h;
 102	unsigned long norm[ColLast];
 103	unsigned long sel[ColLast];
 104	Drawable drawable;
 105	GC gc;
 106	struct {
 107		int ascent;
 108		int descent;
 109		int height;
 110		XFontSet set;
 111		XFontStruct *xfont;
 112	} font;
 113} DC; /* draw context */
 114
 115typedef struct {
 116	unsigned int mod;
 117	KeySym keysym;
 118	void (*func)(const Arg *);
 119	const Arg arg;
 120} Key;
 121
 122typedef struct {
 123	const char *symbol;
 124	void (*arrange)(Monitor *);
 125} Layout;
 126
 127struct Monitor {
 128	char ltsymbol[16];
 129	float mfact;
 130	int nmaster;
 131	int num;
 132	int by;               /* bar geometry */
 133	int mx, my, mw, mh;   /* screen size */
 134	int wx, wy, ww, wh;   /* window area  */
 135	unsigned int seltags;
 136	unsigned int sellt;
 137	unsigned int tagset[2];
 138	Bool showbar;
 139	Bool topbar;
 140	Client *clients;
 141	Client *sel;
 142	Client *stack;
 143	Monitor *next;
 144	Window barwin;
 145	const Layout *lt[2];
 146};
 147
 148typedef struct {
 149	const char *class;
 150	const char *instance;
 151	const char *title;
 152	unsigned int tags;
 153	Bool isfloating;
 154	int monitor;
 155} Rule;
 156
 157/* function declarations */
 158static void applyrules(Client *c);
 159static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160static void arrange(Monitor *m);
 161static void arrangemon(Monitor *m);
 162static void attach(Client *c);
 163static void attachstack(Client *c);
 164static void buttonpress(XEvent *e);
 165static void checkotherwm(void);
 166static void cleanup(void);
 167static void cleanupmon(Monitor *mon);
 168static void clearurgent(Client *c);
 169static void clientmessage(XEvent *e);
 170static void configure(Client *c);
 171static void configurenotify(XEvent *e);
 172static void configurerequest(XEvent *e);
 173static Monitor *createmon(void);
 174static void destroynotify(XEvent *e);
 175static void detach(Client *c);
 176static void detachstack(Client *c);
 177static void die(const char *errstr, ...);
 178static Monitor *dirtomon(int dir);
 179static void drawbar(Monitor *m);
 180static void drawbars(void);
 181static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183static void enternotify(XEvent *e);
 184static void expose(XEvent *e);
 185static void focus(Client *c);
 186static void focusin(XEvent *e);
 187static void focusmon(const Arg *arg);
 188static void focusstack(const Arg *arg);
 189static unsigned long getcolor(const char *colstr);
 190static Bool getrootptr(int *x, int *y);
 191static long getstate(Window w);
 192static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193static void grabbuttons(Client *c, Bool focused);
 194static void grabkeys(void);
 195static void incnmaster(const Arg *arg);
 196static void initfont(const char *fontstr);
 197static void keypress(XEvent *e);
 198static void killclient(const Arg *arg);
 199static void manage(Window w, XWindowAttributes *wa);
 200static void mappingnotify(XEvent *e);
 201static void maprequest(XEvent *e);
 202static void monocle(Monitor *m);
 203static void motionnotify(XEvent *e);
 204static void movemouse(const Arg *arg);
 205static Client *nexttiled(Client *c);
 206static void pop(Client *);
 207static void propertynotify(XEvent *e);
 208static void quit(const Arg *arg);
 209static Monitor *recttomon(int x, int y, int w, int h);
 210static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 211static void resizeclient(Client *c, int x, int y, int w, int h);
 212static void resizemouse(const Arg *arg);
 213static void restack(Monitor *m);
 214static void run(void);
 215static void scan(void);
 216static Bool sendevent(Client *c, Atom proto);
 217static void sendmon(Client *c, Monitor *m);
 218static void setclientstate(Client *c, long state);
 219static void setfocus(Client *c);
 220static void setfullscreen(Client *c, Bool fullscreen);
 221static void setlayout(const Arg *arg);
 222static void setmfact(const Arg *arg);
 223static void setup(void);
 224static void showhide(Client *c);
 225static void sigchld(int unused);
 226static void spawn(const Arg *arg);
 227static void tag(const Arg *arg);
 228static void tagmon(const Arg *arg);
 229static int textnw(const char *text, unsigned int len);
 230static void tile(Monitor *);
 231static void togglebar(const Arg *arg);
 232static void togglefloating(const Arg *arg);
 233static void toggletag(const Arg *arg);
 234static void toggleview(const Arg *arg);
 235static void unfocus(Client *c, Bool setfocus);
 236static void unmanage(Client *c, Bool destroyed);
 237static void unmapnotify(XEvent *e);
 238static void updategeom(void);
 239static void updatebarpos(Monitor *m);
 240static void updatebars(void);
 241static void updateclientlist(void);
 242static void updatenumlockmask(void);
 243static void updatesizehints(Client *c);
 244static void updatestatus(void);
 245static void updatewindowtype(Client *c);
 246static void updatetitle(Client *c);
 247static void updatewmhints(Client *c);
 248static void view(const Arg *arg);
 249static Client *wintoclient(Window w);
 250static Monitor *wintomon(Window w);
 251static int xerror(Display *dpy, XErrorEvent *ee);
 252static int xerrordummy(Display *dpy, XErrorEvent *ee);
 253static int xerrorstart(Display *dpy, XErrorEvent *ee);
 254static void zoom(const Arg *arg);
 255
 256/* variables */
 257static const char broken[] = "broken";
 258static char stext[256];
 259static int screen;
 260static int sw, sh;           /* X display screen geometry width, height */
 261static int bh, blw = 0;      /* bar geometry */
 262static int (*xerrorxlib)(Display *, XErrorEvent *);
 263static unsigned int numlockmask = 0;
 264static void (*handler[LASTEvent]) (XEvent *) = {
 265	[ButtonPress] = buttonpress,
 266	[ClientMessage] = clientmessage,
 267	[ConfigureRequest] = configurerequest,
 268	[ConfigureNotify] = configurenotify,
 269	[DestroyNotify] = destroynotify,
 270	[EnterNotify] = enternotify,
 271	[Expose] = expose,
 272	[FocusIn] = focusin,
 273	[KeyPress] = keypress,
 274	[MappingNotify] = mappingnotify,
 275	[MapRequest] = maprequest,
 276	[MotionNotify] = motionnotify,
 277	[PropertyNotify] = propertynotify,
 278	[UnmapNotify] = unmapnotify
 279};
 280static Atom wmatom[WMLast], netatom[NetLast];
 281static Bool running = True;
 282static Cursor cursor[CurLast];
 283static Display *dpy;
 284static DC dc;
 285static Monitor *mons = NULL, *selmon = NULL;
 286static Window root;
 287
 288/* configuration, allows nested code to access above variables */
 289#include "config.h"
 290
 291/* compile-time check if all tags fit into an unsigned int bit array. */
 292struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 293
 294/* function implementations */
 295void
 296applyrules(Client *c) {
 297	const char *class, *instance;
 298	unsigned int i;
 299	const Rule *r;
 300	Monitor *m;
 301	XClassHint ch = { NULL, NULL };
 302
 303	/* rule matching */
 304	c->isfloating = c->tags = 0;
 305	XGetClassHint(dpy, c->win, &ch);
 306	class    = ch.res_class ? ch.res_class : broken;
 307	instance = ch.res_name  ? ch.res_name  : broken;
 308
 309	for(i = 0; i < LENGTH(rules); i++) {
 310		r = &rules[i];
 311		if((!r->title || strstr(c->name, r->title))
 312		&& (!r->class || strstr(class, r->class))
 313		&& (!r->instance || strstr(instance, r->instance)))
 314		{
 315			c->isfloating = r->isfloating;
 316			c->tags |= r->tags;
 317			for(m = mons; m && m->num != r->monitor; m = m->next);
 318			if(m)
 319				c->mon = m;
 320		}
 321	}
 322	if(ch.res_class)
 323		XFree(ch.res_class);
 324	if(ch.res_name)
 325		XFree(ch.res_name);
 326	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 327}
 328
 329Bool
 330applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 331	Bool baseismin;
 332	Monitor *m = c->mon;
 333
 334	/* set minimum possible */
 335	*w = MAX(1, *w);
 336	*h = MAX(1, *h);
 337	if(interact) {
 338		if(*x > sw)
 339			*x = sw - WIDTH(c);
 340		if(*y > sh)
 341			*y = sh - HEIGHT(c);
 342		if(*x + *w + 2 * c->bw < 0)
 343			*x = 0;
 344		if(*y + *h + 2 * c->bw < 0)
 345			*y = 0;
 346	}
 347	else {
 348		if(*x >= m->wx + m->ww)
 349			*x = m->wx + m->ww - WIDTH(c);
 350		if(*y >= m->wy + m->wh)
 351			*y = m->wy + m->wh - HEIGHT(c);
 352		if(*x + *w + 2 * c->bw <= m->wx)
 353			*x = m->wx;
 354		if(*y + *h + 2 * c->bw <= m->wy)
 355			*y = m->wy;
 356	}
 357	if(*h < bh)
 358		*h = bh;
 359	if(*w < bh)
 360		*w = bh;
 361	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 362		/* see last two sentences in ICCCM 4.1.2.3 */
 363		baseismin = c->basew == c->minw && c->baseh == c->minh;
 364		if(!baseismin) { /* temporarily remove base dimensions */
 365			*w -= c->basew;
 366			*h -= c->baseh;
 367		}
 368		/* adjust for aspect limits */
 369		if(c->mina > 0 && c->maxa > 0) {
 370			if(c->maxa < (float)*w / *h)
 371				*w = *h * c->maxa + 0.5;
 372			else if(c->mina < (float)*h / *w)
 373				*h = *w * c->mina + 0.5;
 374		}
 375		if(baseismin) { /* increment calculation requires this */
 376			*w -= c->basew;
 377			*h -= c->baseh;
 378		}
 379		/* adjust for increment value */
 380		if(c->incw)
 381			*w -= *w % c->incw;
 382		if(c->inch)
 383			*h -= *h % c->inch;
 384		/* restore base dimensions */
 385		*w = MAX(*w + c->basew, c->minw);
 386		*h = MAX(*h + c->baseh, c->minh);
 387		if(c->maxw)
 388			*w = MIN(*w, c->maxw);
 389		if(c->maxh)
 390			*h = MIN(*h, c->maxh);
 391	}
 392	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 393}
 394
 395void
 396arrange(Monitor *m) {
 397	if(m)
 398		showhide(m->stack);
 399	else for(m = mons; m; m = m->next)
 400		showhide(m->stack);
 401	if(m) {
 402		arrangemon(m);
 403		restack(m);
 404	} else for(m = mons; m; m = m->next)
 405		arrangemon(m);
 406}
 407
 408void
 409arrangemon(Monitor *m) {
 410	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 411	if(m->lt[m->sellt]->arrange)
 412		m->lt[m->sellt]->arrange(m);
 413}
 414
 415void
 416attach(Client *c) {
 417	c->next = c->mon->clients;
 418	c->mon->clients = c;
 419}
 420
 421void
 422attachstack(Client *c) {
 423	c->snext = c->mon->stack;
 424	c->mon->stack = c;
 425}
 426
 427void
 428buttonpress(XEvent *e) {
 429	unsigned int i, x, click;
 430	Arg arg = {0};
 431	Client *c;
 432	Monitor *m;
 433	XButtonPressedEvent *ev = &e->xbutton;
 434
 435	click = ClkRootWin;
 436	/* focus monitor if necessary */
 437	if((m = wintomon(ev->window)) && m != selmon) {
 438		unfocus(selmon->sel, True);
 439		selmon = m;
 440		focus(NULL);
 441	}
 442	if(ev->window == selmon->barwin) {
 443		i = x = 0;
 444		do
 445			x += TEXTW(tags[i]);
 446		while(ev->x >= x && ++i < LENGTH(tags));
 447		if(i < LENGTH(tags)) {
 448			click = ClkTagBar;
 449			arg.ui = 1 << i;
 450		}
 451		else if(ev->x < x + blw)
 452			click = ClkLtSymbol;
 453		else if(ev->x > selmon->ww - TEXTW(stext))
 454			click = ClkStatusText;
 455		else
 456			click = ClkWinTitle;
 457	}
 458	else if((c = wintoclient(ev->window))) {
 459		focus(c);
 460		click = ClkClientWin;
 461	}
 462	for(i = 0; i < LENGTH(buttons); i++)
 463		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 464		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 465			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 466}
 467
 468void
 469checkotherwm(void) {
 470	xerrorxlib = XSetErrorHandler(xerrorstart);
 471	/* this causes an error if some other window manager is running */
 472	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 473	XSync(dpy, False);
 474	XSetErrorHandler(xerror);
 475	XSync(dpy, False);
 476}
 477
 478void
 479cleanup(void) {
 480	Arg a = {.ui = ~0};
 481	Layout foo = { "", NULL };
 482	Monitor *m;
 483
 484	view(&a);
 485	selmon->lt[selmon->sellt] = &foo;
 486	for(m = mons; m; m = m->next)
 487		while(m->stack)
 488			unmanage(m->stack, False);
 489	if(dc.font.set)
 490		XFreeFontSet(dpy, dc.font.set);
 491	else
 492		XFreeFont(dpy, dc.font.xfont);
 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
 577	if(ev->window == root) {
 578		sw = ev->width;
 579		sh = ev->height;
 580		if(dc.drawable != 0)
 581			XFreePixmap(dpy, dc.drawable);
 582		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 583		updatebars();
 584		for(m = mons; m; m = m->next)
 585			XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 586		focus(NULL);
 587		arrange(NULL);
 588	}
 589}
 590
 591void
 592configurerequest(XEvent *e) {
 593	Client *c;
 594	Monitor *m;
 595	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 596	XWindowChanges wc;
 597
 598	if((c = wintoclient(ev->window))) {
 599		if(ev->value_mask & CWBorderWidth)
 600			c->bw = ev->border_width;
 601		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 602			m = c->mon;
 603			if(ev->value_mask & CWX) {
 604				c->oldx = c->x;
 605				c->x = m->mx + ev->x;
 606			}
 607			if(ev->value_mask & CWY) {
 608				c->oldy = c->y;
 609				c->y = m->my + ev->y;
 610			}
 611			if(ev->value_mask & CWWidth) {
 612				c->oldw = c->w;
 613				c->w = ev->width;
 614			}
 615			if(ev->value_mask & CWHeight) {
 616				c->oldh = c->h;
 617				c->h = ev->height;
 618			}
 619			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 620				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 621			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 622				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 623			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 624				configure(c);
 625			if(ISVISIBLE(c))
 626				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 627		}
 628		else
 629			configure(c);
 630	}
 631	else {
 632		wc.x = ev->x;
 633		wc.y = ev->y;
 634		wc.width = ev->width;
 635		wc.height = ev->height;
 636		wc.border_width = ev->border_width;
 637		wc.sibling = ev->above;
 638		wc.stack_mode = ev->detail;
 639		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 640	}
 641	XSync(dpy, False);
 642}
 643
 644Monitor *
 645createmon(void) {
 646	Monitor *m;
 647
 648	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 649		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 650	m->tagset[0] = m->tagset[1] = 1;
 651	m->mfact = mfact;
 652	m->nmaster = nmaster;
 653	m->showbar = showbar;
 654	m->topbar = topbar;
 655	m->lt[0] = &layouts[0];
 656	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 657	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 658	return m;
 659}
 660
 661void
 662destroynotify(XEvent *e) {
 663	Client *c;
 664	XDestroyWindowEvent *ev = &e->xdestroywindow;
 665
 666	if((c = wintoclient(ev->window)))
 667		unmanage(c, True);
 668}
 669
 670void
 671detach(Client *c) {
 672	Client **tc;
 673
 674	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 675	*tc = c->next;
 676}
 677
 678void
 679detachstack(Client *c) {
 680	Client **tc, *t;
 681
 682	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 683	*tc = c->snext;
 684
 685	if(c == c->mon->sel) {
 686		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 687		c->mon->sel = t;
 688	}
 689}
 690
 691void
 692die(const char *errstr, ...) {
 693	va_list ap;
 694
 695	va_start(ap, errstr);
 696	vfprintf(stderr, errstr, ap);
 697	va_end(ap);
 698	exit(EXIT_FAILURE);
 699}
 700
 701Monitor *
 702dirtomon(int dir) {
 703	Monitor *m = NULL;
 704
 705	if(dir > 0) {
 706		if(!(m = selmon->next))
 707			m = mons;
 708	}
 709	else if(selmon == mons)
 710		for(m = mons; m->next; m = m->next);
 711	else
 712		for(m = mons; m->next != selmon; m = m->next);
 713	return m;
 714}
 715
 716void
 717drawbar(Monitor *m) {
 718	int x;
 719	unsigned int i, occ = 0, urg = 0;
 720	unsigned long *col;
 721	Client *c;
 722
 723	for(c = m->clients; c; c = c->next) {
 724		occ |= c->tags;
 725		if(c->isurgent)
 726			urg |= c->tags;
 727	}
 728	dc.x = 0;
 729	for(i = 0; i < LENGTH(tags); i++) {
 730		dc.w = TEXTW(tags[i]);
 731		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 732		drawtext(tags[i], col, urg & 1 << i);
 733		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 734		           occ & 1 << i, urg & 1 << i, col);
 735		dc.x += dc.w;
 736	}
 737	dc.w = blw = TEXTW(m->ltsymbol);
 738	drawtext(m->ltsymbol, dc.norm, False);
 739	dc.x += dc.w;
 740	x = dc.x;
 741	if(m == selmon) { /* status is only drawn on selected monitor */
 742		dc.w = TEXTW(stext);
 743		dc.x = m->ww - dc.w;
 744		if(dc.x < x) {
 745			dc.x = x;
 746			dc.w = m->ww - x;
 747		}
 748		drawtext(stext, dc.norm, False);
 749	}
 750	else
 751		dc.x = m->ww;
 752	if((dc.w = dc.x - x) > bh) {
 753		dc.x = x;
 754		if(m->sel) {
 755			col = m == selmon ? dc.sel : dc.norm;
 756			drawtext(m->sel->name, col, False);
 757			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 758		}
 759		else
 760			drawtext(NULL, dc.norm, False);
 761	}
 762	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 763	XSync(dpy, False);
 764}
 765
 766void
 767drawbars(void) {
 768	Monitor *m;
 769
 770	for(m = mons; m; m = m->next)
 771		drawbar(m);
 772}
 773
 774void
 775drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 776	int x;
 777
 778	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 779	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 780	if(filled)
 781		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 782	else if(empty)
 783		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 784}
 785
 786void
 787drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 788	char buf[256];
 789	int i, x, y, h, len, olen;
 790
 791	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 792	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 793	if(!text)
 794		return;
 795	olen = strlen(text);
 796	h = dc.font.ascent + dc.font.descent;
 797	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 798	x = dc.x + (h / 2);
 799	/* shorten text if necessary */
 800	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 801	if(!len)
 802		return;
 803	memcpy(buf, text, len);
 804	if(len < olen)
 805		for(i = len; i && i > len - 3; buf[--i] = '.');
 806	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 807	if(dc.font.set)
 808		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 809	else
 810		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 811}
 812
 813void
 814enternotify(XEvent *e) {
 815	Client *c;
 816	Monitor *m;
 817	XCrossingEvent *ev = &e->xcrossing;
 818
 819	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 820		return;
 821	c = wintoclient(ev->window);
 822	m = c ? c->mon : wintomon(ev->window);
 823	if(m != selmon) {
 824		unfocus(selmon->sel, True);
 825		selmon = m;
 826	}
 827	else if(!c || c == selmon->sel)
 828		return;
 829	focus(c);
 830}
 831
 832void
 833expose(XEvent *e) {
 834	Monitor *m;
 835	XExposeEvent *ev = &e->xexpose;
 836
 837	if(ev->count == 0 && (m = wintomon(ev->window)))
 838		drawbar(m);
 839}
 840
 841void
 842focus(Client *c) {
 843	if(!c || !ISVISIBLE(c))
 844		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 845	/* was if(selmon->sel) */
 846	if(selmon->sel && selmon->sel != c)
 847		unfocus(selmon->sel, False);
 848	if(c) {
 849		if(c->mon != selmon)
 850			selmon = c->mon;
 851		if(c->isurgent)
 852			clearurgent(c);
 853		detachstack(c);
 854		attachstack(c);
 855		grabbuttons(c, True);
 856		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 857		setfocus(c);
 858	}
 859	else {
 860		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 861		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 862	}
 863	selmon->sel = c;
 864	drawbars();
 865}
 866
 867void
 868focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 869	XFocusChangeEvent *ev = &e->xfocus;
 870
 871	if(selmon->sel && ev->window != selmon->sel->win)
 872		setfocus(selmon->sel);
 873}
 874
 875void
 876focusmon(const Arg *arg) {
 877	Monitor *m;
 878
 879	if(!mons->next)
 880		return;
 881	if((m = dirtomon(arg->i)) == selmon)
 882		return;
 883	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 884					in gedit and anjuta */
 885	selmon = m;
 886	focus(NULL);
 887}
 888
 889void
 890focusstack(const Arg *arg) {
 891	Client *c = NULL, *i;
 892
 893	if(!selmon->sel)
 894		return;
 895	if(arg->i > 0) {
 896		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 897		if(!c)
 898			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 899	}
 900	else {
 901		for(i = selmon->clients; i != selmon->sel; i = i->next)
 902			if(ISVISIBLE(i))
 903				c = i;
 904		if(!c)
 905			for(; i; i = i->next)
 906				if(ISVISIBLE(i))
 907					c = i;
 908	}
 909	if(c) {
 910		focus(c);
 911		restack(selmon);
 912	}
 913}
 914
 915Atom
 916getatomprop(Client *c, Atom prop) {
 917	int di;
 918	unsigned long dl;
 919	unsigned char *p = NULL;
 920	Atom da, atom = None;
 921
 922	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 923	                      &da, &di, &dl, &dl, &p) == Success && p) {
 924		atom = *(Atom *)p;
 925		XFree(p);
 926	}
 927	return atom;
 928}
 929
 930unsigned long
 931getcolor(const char *colstr) {
 932	Colormap cmap = DefaultColormap(dpy, screen);
 933	XColor color;
 934
 935	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 936		die("error, cannot allocate color '%s'\n", colstr);
 937	return color.pixel;
 938}
 939
 940Bool
 941getrootptr(int *x, int *y) {
 942	int di;
 943	unsigned int dui;
 944	Window dummy;
 945
 946	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 947}
 948
 949long
 950getstate(Window w) {
 951	int format;
 952	long result = -1;
 953	unsigned char *p = NULL;
 954	unsigned long n, extra;
 955	Atom real;
 956
 957	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 958	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 959		return -1;
 960	if(n != 0)
 961		result = *p;
 962	XFree(p);
 963	return result;
 964}
 965
 966Bool
 967gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 968	char **list = NULL;
 969	int n;
 970	XTextProperty name;
 971
 972	if(!text || size == 0)
 973		return False;
 974	text[0] = '\0';
 975	XGetTextProperty(dpy, w, &name, atom);
 976	if(!name.nitems)
 977		return False;
 978	if(name.encoding == XA_STRING)
 979		strncpy(text, (char *)name.value, size - 1);
 980	else {
 981		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 982			strncpy(text, *list, size - 1);
 983			XFreeStringList(list);
 984		}
 985	}
 986	text[size - 1] = '\0';
 987	XFree(name.value);
 988	return True;
 989}
 990
 991void
 992grabbuttons(Client *c, Bool focused) {
 993	updatenumlockmask();
 994	{
 995		unsigned int i, j;
 996		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 997		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 998		if(focused) {
 999			for(i = 0; i < LENGTH(buttons); i++)
1000				if(buttons[i].click == ClkClientWin)
1001					for(j = 0; j < LENGTH(modifiers); j++)
1002						XGrabButton(dpy, buttons[i].button,
1003						            buttons[i].mask | modifiers[j],
1004						            c->win, False, BUTTONMASK,
1005						            GrabModeAsync, GrabModeSync, None, None);
1006		}
1007		else
1008			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1009			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1010	}
1011}
1012
1013void
1014grabkeys(void) {
1015	updatenumlockmask();
1016	{
1017		unsigned int i, j;
1018		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1019		KeyCode code;
1020
1021		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1022		for(i = 0; i < LENGTH(keys); i++)
1023			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1024				for(j = 0; j < LENGTH(modifiers); j++)
1025					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1026						 True, GrabModeAsync, GrabModeAsync);
1027	}
1028}
1029
1030void
1031incnmaster(const Arg *arg) {
1032	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1033	arrange(selmon);
1034}
1035
1036void
1037initfont(const char *fontstr) {
1038	char *def, **missing;
1039	int n;
1040
1041	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1042	if(missing) {
1043		while(n--)
1044			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1045		XFreeStringList(missing);
1046	}
1047	if(dc.font.set) {
1048		XFontStruct **xfonts;
1049		char **font_names;
1050
1051		dc.font.ascent = dc.font.descent = 0;
1052		XExtentsOfFontSet(dc.font.set);
1053		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1054		while(n--) {
1055			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1056			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1057			xfonts++;
1058		}
1059	}
1060	else {
1061		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1062		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1063			die("error, cannot load font: '%s'\n", fontstr);
1064		dc.font.ascent = dc.font.xfont->ascent;
1065		dc.font.descent = dc.font.xfont->descent;
1066	}
1067	dc.font.height = dc.font.ascent + dc.font.descent;
1068}
1069
1070#ifdef XINERAMA
1071static Bool
1072isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1073	while(n--)
1074		/* treat origin (x, y) as fixpoint for uniqueness only, first screen wins */
1075		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org)
1076			return False;
1077	return True;
1078}
1079#endif /* XINERAMA */
1080
1081void
1082keypress(XEvent *e) {
1083	unsigned int i;
1084	KeySym keysym;
1085	XKeyEvent *ev;
1086
1087	ev = &e->xkey;
1088	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1089	for(i = 0; i < LENGTH(keys); i++)
1090		if(keysym == keys[i].keysym
1091		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1092		&& keys[i].func)
1093			keys[i].func(&(keys[i].arg));
1094}
1095
1096void
1097killclient(const Arg *arg) {
1098	if(!selmon->sel)
1099		return;
1100	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1101		XGrabServer(dpy);
1102		XSetErrorHandler(xerrordummy);
1103		XSetCloseDownMode(dpy, DestroyAll);
1104		XKillClient(dpy, selmon->sel->win);
1105		XSync(dpy, False);
1106		XSetErrorHandler(xerror);
1107		XUngrabServer(dpy);
1108	}
1109}
1110
1111void
1112manage(Window w, XWindowAttributes *wa) {
1113	Client *c, *t = NULL;
1114	Window trans = None;
1115	XWindowChanges wc;
1116
1117	if(!(c = calloc(1, sizeof(Client))))
1118		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1119	c->win = w;
1120	updatetitle(c);
1121	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1122		c->mon = t->mon;
1123		c->tags = t->tags;
1124	}
1125	else {
1126		c->mon = selmon;
1127		applyrules(c);
1128	}
1129	/* geometry */
1130	c->x = c->oldx = wa->x;
1131	c->y = c->oldy = wa->y;
1132	c->w = c->oldw = wa->width;
1133	c->h = c->oldh = wa->height;
1134	c->oldbw = wa->border_width;
1135
1136	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1137		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1138	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1139		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1140	c->x = MAX(c->x, c->mon->mx);
1141	/* only fix client y-offset, if the client center might cover the bar */
1142	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1143	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1144	c->bw = borderpx;
1145
1146	wc.border_width = c->bw;
1147	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1148	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1149	configure(c); /* propagates border_width, if size doesn't change */
1150	updatewindowtype(c);
1151	updatesizehints(c);
1152	updatewmhints(c);
1153	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1154	grabbuttons(c, False);
1155	if(!c->isfloating)
1156		c->isfloating = c->oldstate = trans != None || c->isfixed;
1157	if(c->isfloating)
1158		XRaiseWindow(dpy, c->win);
1159	attach(c);
1160	attachstack(c);
1161	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1162	                (unsigned char *) &(c->win), 1);
1163	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1164	setclientstate(c, NormalState);
1165	if (c->mon == selmon)
1166		unfocus(selmon->sel, False);
1167	c->mon->sel = c;
1168	arrange(c->mon);
1169	XMapWindow(dpy, c->win);
1170	focus(NULL);
1171}
1172
1173void
1174mappingnotify(XEvent *e) {
1175	XMappingEvent *ev = &e->xmapping;
1176
1177	XRefreshKeyboardMapping(ev);
1178	if(ev->request == MappingKeyboard)
1179		grabkeys();
1180}
1181
1182void
1183maprequest(XEvent *e) {
1184	static XWindowAttributes wa;
1185	XMapRequestEvent *ev = &e->xmaprequest;
1186
1187	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1188		return;
1189	if(wa.override_redirect)
1190		return;
1191	if(!wintoclient(ev->window))
1192		manage(ev->window, &wa);
1193}
1194
1195void
1196monocle(Monitor *m) {
1197	unsigned int n = 0;
1198	Client *c;
1199
1200	for(c = m->clients; c; c = c->next)
1201		if(ISVISIBLE(c))
1202			n++;
1203	if(n > 0) /* override layout symbol */
1204		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1205	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1206		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1207}
1208
1209void
1210motionnotify(XEvent *e) {
1211	static Monitor *mon = NULL;
1212	Monitor *m;
1213	XMotionEvent *ev = &e->xmotion;
1214
1215	if(ev->window != root)
1216		return;
1217	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1218		unfocus(selmon->sel, True);
1219		selmon = m;
1220		focus(NULL);
1221	}
1222	mon = m;
1223}
1224
1225void
1226movemouse(const Arg *arg) {
1227	int x, y, ocx, ocy, nx, ny;
1228	Client *c;
1229	Monitor *m;
1230	XEvent ev;
1231
1232	if(!(c = selmon->sel))
1233		return;
1234	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1235		return;
1236	restack(selmon);
1237	ocx = c->x;
1238	ocy = c->y;
1239	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1240	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1241		return;
1242	if(!getrootptr(&x, &y))
1243		return;
1244	do {
1245		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1246		switch(ev.type) {
1247		case ConfigureRequest:
1248		case Expose:
1249		case MapRequest:
1250			handler[ev.type](&ev);
1251			break;
1252		case MotionNotify:
1253			nx = ocx + (ev.xmotion.x - x);
1254			ny = ocy + (ev.xmotion.y - y);
1255			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1256			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1257				if(abs(selmon->wx - nx) < snap)
1258					nx = selmon->wx;
1259				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1260					nx = selmon->wx + selmon->ww - WIDTH(c);
1261				if(abs(selmon->wy - ny) < snap)
1262					ny = selmon->wy;
1263				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1264					ny = selmon->wy + selmon->wh - HEIGHT(c);
1265				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1266				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1267					togglefloating(NULL);
1268			}
1269			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1270				resize(c, nx, ny, c->w, c->h, True);
1271			break;
1272		}
1273	} while(ev.type != ButtonRelease);
1274	XUngrabPointer(dpy, CurrentTime);
1275	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1276		sendmon(c, m);
1277		selmon = m;
1278		focus(NULL);
1279	}
1280}
1281
1282Client *
1283nexttiled(Client *c) {
1284	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1285	return c;
1286}
1287
1288void
1289pop(Client *c) {
1290	detach(c);
1291	attach(c);
1292	focus(c);
1293	arrange(c->mon);
1294}
1295
1296void
1297propertynotify(XEvent *e) {
1298	Client *c;
1299	Window trans;
1300	XPropertyEvent *ev = &e->xproperty;
1301
1302	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1303		updatestatus();
1304	else if(ev->state == PropertyDelete)
1305		return; /* ignore */
1306	else if((c = wintoclient(ev->window))) {
1307		switch(ev->atom) {
1308		default: break;
1309		case XA_WM_TRANSIENT_FOR:
1310			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1311			   (c->isfloating = (wintoclient(trans)) != NULL))
1312				arrange(c->mon);
1313			break;
1314		case XA_WM_NORMAL_HINTS:
1315			updatesizehints(c);
1316			break;
1317		case XA_WM_HINTS:
1318			updatewmhints(c);
1319			drawbars();
1320			break;
1321		}
1322		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1323			updatetitle(c);
1324			if(c == c->mon->sel)
1325				drawbar(c->mon);
1326		}
1327		if(ev->atom == netatom[NetWMWindowType])
1328			updatewindowtype(c);
1329	}
1330}
1331
1332void
1333quit(const Arg *arg) {
1334	running = False;
1335}
1336
1337Monitor *
1338recttomon(int x, int y, int w, int h) {
1339	Monitor *m, *r = selmon;
1340	int a, area = 0;
1341
1342	for(m = mons; m; m = m->next)
1343		if((a = INTERSECT(x, y, w, h, m)) > area) {
1344			area = a;
1345			r = m;
1346		}
1347	return r;
1348}
1349
1350void
1351resize(Client *c, int x, int y, int w, int h, Bool interact) {
1352	if(applysizehints(c, &x, &y, &w, &h, interact))
1353		resizeclient(c, x, y, w, h);
1354}
1355
1356void
1357resizeclient(Client *c, int x, int y, int w, int h) {
1358	XWindowChanges wc;
1359
1360	c->oldx = c->x; c->x = wc.x = x;
1361	c->oldy = c->y; c->y = wc.y = y;
1362	c->oldw = c->w; c->w = wc.width = w;
1363	c->oldh = c->h; c->h = wc.height = h;
1364	wc.border_width = c->bw;
1365	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1366	configure(c);
1367	XSync(dpy, False);
1368}
1369
1370void
1371resizemouse(const Arg *arg) {
1372	int ocx, ocy;
1373	int nw, nh;
1374	Client *c;
1375	Monitor *m;
1376	XEvent ev;
1377
1378	if(!(c = selmon->sel))
1379		return;
1380	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1381		return;
1382	restack(selmon);
1383	ocx = c->x;
1384	ocy = c->y;
1385	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1386	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1387		return;
1388	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1389	do {
1390		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1391		switch(ev.type) {
1392		case ConfigureRequest:
1393		case Expose:
1394		case MapRequest:
1395			handler[ev.type](&ev);
1396			break;
1397		case MotionNotify:
1398			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1399			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1400			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1401			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1402			{
1403				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1404				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1405					togglefloating(NULL);
1406			}
1407			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1408				resize(c, c->x, c->y, nw, nh, True);
1409			break;
1410		}
1411	} while(ev.type != ButtonRelease);
1412	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1413	XUngrabPointer(dpy, CurrentTime);
1414	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1415	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1416		sendmon(c, m);
1417		selmon = m;
1418		focus(NULL);
1419	}
1420}
1421
1422void
1423restack(Monitor *m) {
1424	Client *c;
1425	XEvent ev;
1426	XWindowChanges wc;
1427
1428	drawbar(m);
1429	if(!m->sel)
1430		return;
1431	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1432		XRaiseWindow(dpy, m->sel->win);
1433	if(m->lt[m->sellt]->arrange) {
1434		wc.stack_mode = Below;
1435		wc.sibling = m->barwin;
1436		for(c = m->stack; c; c = c->snext)
1437			if(!c->isfloating && ISVISIBLE(c)) {
1438				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1439				wc.sibling = c->win;
1440			}
1441	}
1442	XSync(dpy, False);
1443	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1444}
1445
1446void
1447run(void) {
1448	XEvent ev;
1449	/* main event loop */
1450	XSync(dpy, False);
1451	while(running && !XNextEvent(dpy, &ev))
1452		if(handler[ev.type])
1453			handler[ev.type](&ev); /* call handler */
1454}
1455
1456void
1457scan(void) {
1458	unsigned int i, num;
1459	Window d1, d2, *wins = NULL;
1460	XWindowAttributes wa;
1461
1462	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1463		for(i = 0; i < num; i++) {
1464			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1465			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1466				continue;
1467			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1468				manage(wins[i], &wa);
1469		}
1470		for(i = 0; i < num; i++) { /* now the transients */
1471			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1472				continue;
1473			if(XGetTransientForHint(dpy, wins[i], &d1)
1474			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1475				manage(wins[i], &wa);
1476		}
1477		if(wins)
1478			XFree(wins);
1479	}
1480}
1481
1482void
1483sendmon(Client *c, Monitor *m) {
1484	if(c->mon == m)
1485		return;
1486	unfocus(c, True);
1487	detach(c);
1488	detachstack(c);
1489	c->mon = m;
1490	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1491	attach(c);
1492	attachstack(c);
1493	focus(NULL);
1494	arrange(NULL);
1495}
1496
1497void
1498setclientstate(Client *c, long state) {
1499	long data[] = { state, None };
1500
1501	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1502			PropModeReplace, (unsigned char *)data, 2);
1503}
1504
1505Bool
1506sendevent(Client *c, Atom proto) {
1507	int n;
1508	Atom *protocols;
1509	Bool exists = False;
1510	XEvent ev;
1511
1512	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1513		while(!exists && n--)
1514			exists = protocols[n] == proto;
1515		XFree(protocols);
1516	}
1517	if(exists) {
1518		ev.type = ClientMessage;
1519		ev.xclient.window = c->win;
1520		ev.xclient.message_type = wmatom[WMProtocols];
1521		ev.xclient.format = 32;
1522		ev.xclient.data.l[0] = proto;
1523		ev.xclient.data.l[1] = CurrentTime;
1524		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1525	}
1526	return exists;
1527}
1528
1529void
1530setfocus(Client *c) {
1531	if(!c->neverfocus) {
1532		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1533		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1534 		                XA_WINDOW, 32, PropModeReplace,
1535 		                (unsigned char *) &(c->win), 1);
1536	}
1537	sendevent(c, wmatom[WMTakeFocus]);
1538}
1539
1540void
1541setfullscreen(Client *c, Bool fullscreen) {
1542	if(fullscreen) {
1543		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1544		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1545		c->isfullscreen = True;
1546		c->oldstate = c->isfloating;
1547		c->oldbw = c->bw;
1548		c->bw = 0;
1549		c->isfloating = True;
1550		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1551		XRaiseWindow(dpy, c->win);
1552	}
1553	else {
1554		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1555		                PropModeReplace, (unsigned char*)0, 0);
1556		c->isfullscreen = False;
1557		c->isfloating = c->oldstate;
1558		c->bw = c->oldbw;
1559		c->x = c->oldx;
1560		c->y = c->oldy;
1561		c->w = c->oldw;
1562		c->h = c->oldh;
1563		resizeclient(c, c->x, c->y, c->w, c->h);
1564		arrange(c->mon);
1565	}
1566}
1567
1568void
1569setlayout(const Arg *arg) {
1570	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1571		selmon->sellt ^= 1;
1572	if(arg && arg->v)
1573		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1574	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1575	if(selmon->sel)
1576		arrange(selmon);
1577	else
1578		drawbar(selmon);
1579}
1580
1581/* arg > 1.0 will set mfact absolutly */
1582void
1583setmfact(const Arg *arg) {
1584	float f;
1585
1586	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1587		return;
1588	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1589	if(f < 0.1 || f > 0.9)
1590		return;
1591	selmon->mfact = f;
1592	arrange(selmon);
1593}
1594
1595void
1596setup(void) {
1597	XSetWindowAttributes wa;
1598
1599	/* clean up any zombies immediately */
1600	sigchld(0);
1601
1602	/* init screen */
1603	screen = DefaultScreen(dpy);
1604	root = RootWindow(dpy, screen);
1605	initfont(font);
1606	sw = DisplayWidth(dpy, screen);
1607	sh = DisplayHeight(dpy, screen);
1608	bh = dc.h = dc.font.height + 2;
1609	updategeom();
1610	/* init atoms */
1611	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1612	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1613	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1614	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1615	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1616	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1617	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1618	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1619	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1620	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1621	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1622	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1623	/* init cursors */
1624	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1625	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1626	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1627	/* init appearance */
1628	dc.norm[ColBorder] = getcolor(normbordercolor);
1629	dc.norm[ColBG] = getcolor(normbgcolor);
1630	dc.norm[ColFG] = getcolor(normfgcolor);
1631	dc.sel[ColBorder] = getcolor(selbordercolor);
1632	dc.sel[ColBG] = getcolor(selbgcolor);
1633	dc.sel[ColFG] = getcolor(selfgcolor);
1634	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1635	dc.gc = XCreateGC(dpy, root, 0, NULL);
1636	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1637	if(!dc.font.set)
1638		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1639	/* init bars */
1640	updatebars();
1641	updatestatus();
1642	/* EWMH support per view */
1643	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1644			PropModeReplace, (unsigned char *) netatom, NetLast);
1645	XDeleteProperty(dpy, root, netatom[NetClientList]);
1646	/* select for events */
1647	wa.cursor = cursor[CurNormal];
1648	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1649	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1650	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1651	XSelectInput(dpy, root, wa.event_mask);
1652	grabkeys();
1653}
1654
1655void
1656showhide(Client *c) {
1657	if(!c)
1658		return;
1659	if(ISVISIBLE(c)) { /* show clients top down */
1660		XMoveWindow(dpy, c->win, c->x, c->y);
1661		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1662			resize(c, c->x, c->y, c->w, c->h, False);
1663		showhide(c->snext);
1664	}
1665	else { /* hide clients bottom up */
1666		showhide(c->snext);
1667		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1668	}
1669}
1670
1671void
1672sigchld(int unused) {
1673	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1674		die("Can't install SIGCHLD handler");
1675	while(0 < waitpid(-1, NULL, WNOHANG));
1676}
1677
1678void
1679spawn(const Arg *arg) {
1680	if(fork() == 0) {
1681		if(dpy)
1682			close(ConnectionNumber(dpy));
1683		setsid();
1684		execvp(((char **)arg->v)[0], (char **)arg->v);
1685		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1686		perror(" failed");
1687		exit(EXIT_SUCCESS);
1688	}
1689}
1690
1691void
1692tag(const Arg *arg) {
1693	if(selmon->sel && arg->ui & TAGMASK) {
1694		selmon->sel->tags = arg->ui & TAGMASK;
1695		focus(NULL);
1696		arrange(selmon);
1697	}
1698}
1699
1700void
1701tagmon(const Arg *arg) {
1702	if(!selmon->sel || !mons->next)
1703		return;
1704	sendmon(selmon->sel, dirtomon(arg->i));
1705}
1706
1707int
1708textnw(const char *text, unsigned int len) {
1709	XRectangle r;
1710
1711	if(dc.font.set) {
1712		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1713		return r.width;
1714	}
1715	return XTextWidth(dc.font.xfont, text, len);
1716}
1717
1718void
1719tile(Monitor *m) {
1720	unsigned int i, n, h, mw, my, ty;
1721	Client *c;
1722
1723	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1724	if(n == 0)
1725		return;
1726
1727	if(n > m->nmaster)
1728		mw = m->nmaster ? m->ww * m->mfact : 0;
1729	else
1730		mw = m->ww;
1731	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1732		if(i < m->nmaster) {
1733			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1734			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1735			my += HEIGHT(c);
1736		}
1737		else {
1738			h = (m->wh - ty) / (n - i);
1739			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1740			ty += HEIGHT(c);
1741		}
1742}
1743
1744void
1745togglebar(const Arg *arg) {
1746	selmon->showbar = !selmon->showbar;
1747	updatebarpos(selmon);
1748	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1749	arrange(selmon);
1750}
1751
1752void
1753togglefloating(const Arg *arg) {
1754	if(!selmon->sel)
1755		return;
1756	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1757		return;
1758	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1759	if(selmon->sel->isfloating)
1760		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1761		       selmon->sel->w, selmon->sel->h, False);
1762	arrange(selmon);
1763}
1764
1765void
1766toggletag(const Arg *arg) {
1767	unsigned int newtags;
1768
1769	if(!selmon->sel)
1770		return;
1771	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1772	if(newtags) {
1773		selmon->sel->tags = newtags;
1774		focus(NULL);
1775		arrange(selmon);
1776	}
1777}
1778
1779void
1780toggleview(const Arg *arg) {
1781	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1782
1783	if(newtagset) {
1784		selmon->tagset[selmon->seltags] = newtagset;
1785		focus(NULL);
1786		arrange(selmon);
1787	}
1788}
1789
1790void
1791unfocus(Client *c, Bool setfocus) {
1792	if(!c)
1793		return;
1794	grabbuttons(c, False);
1795	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1796	if(setfocus) {
1797		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1798		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1799	}
1800}
1801
1802void
1803unmanage(Client *c, Bool destroyed) {
1804	Monitor *m = c->mon;
1805	XWindowChanges wc;
1806
1807	/* The server grab construct avoids race conditions. */
1808	detach(c);
1809	detachstack(c);
1810	if(!destroyed) {
1811		wc.border_width = c->oldbw;
1812		XGrabServer(dpy);
1813		XSetErrorHandler(xerrordummy);
1814		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1815		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1816		setclientstate(c, WithdrawnState);
1817		XSync(dpy, False);
1818		XSetErrorHandler(xerror);
1819		XUngrabServer(dpy);
1820	}
1821	free(c);
1822	focus(NULL);
1823	updateclientlist();
1824	arrange(m);
1825}
1826
1827void
1828unmapnotify(XEvent *e) {
1829	Client *c;
1830	XUnmapEvent *ev = &e->xunmap;
1831
1832	if((c = wintoclient(ev->window))) {
1833		if(ev->send_event)
1834			setclientstate(c, WithdrawnState);
1835		else
1836			unmanage(c, False);
1837	}
1838}
1839
1840void
1841updatebars(void) {
1842	Monitor *m;
1843	XSetWindowAttributes wa = {
1844		.override_redirect = True,
1845		.background_pixmap = ParentRelative,
1846		.event_mask = ButtonPressMask|ExposureMask
1847	};
1848	for(m = mons; m; m = m->next) {
1849		if (m->barwin)
1850			continue;
1851		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1852		                          CopyFromParent, DefaultVisual(dpy, screen),
1853		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1854		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1855		XMapRaised(dpy, m->barwin);
1856	}
1857}
1858
1859void
1860updatebarpos(Monitor *m) {
1861	m->wy = m->my;
1862	m->wh = m->mh;
1863	if(m->showbar) {
1864		m->wh -= bh;
1865		m->by = m->topbar ? m->wy : m->wy + m->wh;
1866		m->wy = m->topbar ? m->wy + bh : m->wy;
1867	}
1868	else
1869		m->by = -bh;
1870}
1871
1872void
1873updateclientlist() {
1874	Client *c;
1875	Monitor *m;
1876
1877	XDeleteProperty(dpy, root, netatom[NetClientList]);
1878	for(m = mons; m; m = m->next)
1879		for(c = m->clients; c; c = c->next)
1880			XChangeProperty(dpy, root, netatom[NetClientList],
1881			                XA_WINDOW, 32, PropModeAppend,
1882			                (unsigned char *) &(c->win), 1);
1883}
1884
1885void
1886updategeom(void) {
1887	/* Starting with dwm 6.1 this function uses a new (simpler) strategy:
1888	 * whenever screen changes are reported, we destroy all monitors
1889	 * and recreate all unique origin monitors and add all clients to
1890	 * the first monitor, only. In several circumstances this may suck,
1891	 * but dealing with all corner-cases sucks even more.*/
1892
1893#ifdef XINERAMA
1894	if(XineramaIsActive(dpy)) {
1895		int i, j, n;
1896		Client *c;
1897		Monitor *m, *oldmons = mons;
1898		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &n);
1899		XineramaScreenInfo *unique = NULL;
1900
1901		/* only consider unique geometries as separate screens */
1902		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * n)))
1903			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * n);
1904		for(i = 0, j = 0; i < n; i++)
1905			if(isuniquegeom(unique, j, &info[i]))
1906				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1907		XFree(info);
1908		/* create new monitor structure */
1909		n = j;
1910		mons = m = createmon(); /* new first monitor */
1911		for(i = 1; i < n; i++) {
1912			m->next = createmon();
1913			m = m->next;
1914		}
1915		for(i = 0, m = mons; i < n && m; m = m->next, i++) {
1916			m->num = i;
1917			m->mx = m->wx = unique[i].x_org;
1918			m->my = m->wy = unique[i].y_org;
1919			m->mw = m->ww = unique[i].width;
1920			m->mh = m->wh = unique[i].height;
1921			updatebarpos(m);
1922		}
1923		free(unique);
1924		/* re-attach old clients and cleanup old monitor structure */
1925		while(oldmons) {
1926			m = oldmons;
1927			while(m->clients) {
1928				c = m->clients;
1929				m->clients = c->next;
1930				detachstack(c);
1931				c->mon = mons;
1932				attach(c);
1933				attachstack(c);
1934			}
1935			oldmons = m->next;
1936			cleanupmon(m);
1937		}
1938	}
1939	else
1940#endif /* XINERAMA */
1941	/* default monitor setup */
1942	{
1943		if(!mons) /* only true if !XINERAMA compile flag */
1944			mons = createmon();
1945		if(mons->mw != sw || mons->mh != sh) {
1946			mons->mw = mons->ww = sw;
1947			mons->mh = mons->wh = sh;
1948			updatebarpos(mons);
1949		}
1950	}
1951	selmon = mons;
1952	selmon = wintomon(root);
1953}
1954
1955void
1956updatenumlockmask(void) {
1957	unsigned int i, j;
1958	XModifierKeymap *modmap;
1959
1960	numlockmask = 0;
1961	modmap = XGetModifierMapping(dpy);
1962	for(i = 0; i < 8; i++)
1963		for(j = 0; j < modmap->max_keypermod; j++)
1964			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1965			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1966				numlockmask = (1 << i);
1967	XFreeModifiermap(modmap);
1968}
1969
1970void
1971updatesizehints(Client *c) {
1972	long msize;
1973	XSizeHints size;
1974
1975	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1976		/* size is uninitialized, ensure that size.flags aren't used */
1977		size.flags = PSize;
1978	if(size.flags & PBaseSize) {
1979		c->basew = size.base_width;
1980		c->baseh = size.base_height;
1981	}
1982	else if(size.flags & PMinSize) {
1983		c->basew = size.min_width;
1984		c->baseh = size.min_height;
1985	}
1986	else
1987		c->basew = c->baseh = 0;
1988	if(size.flags & PResizeInc) {
1989		c->incw = size.width_inc;
1990		c->inch = size.height_inc;
1991	}
1992	else
1993		c->incw = c->inch = 0;
1994	if(size.flags & PMaxSize) {
1995		c->maxw = size.max_width;
1996		c->maxh = size.max_height;
1997	}
1998	else
1999		c->maxw = c->maxh = 0;
2000	if(size.flags & PMinSize) {
2001		c->minw = size.min_width;
2002		c->minh = size.min_height;
2003	}
2004	else if(size.flags & PBaseSize) {
2005		c->minw = size.base_width;
2006		c->minh = size.base_height;
2007	}
2008	else
2009		c->minw = c->minh = 0;
2010	if(size.flags & PAspect) {
2011		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2012		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2013	}
2014	else
2015		c->maxa = c->mina = 0.0;
2016	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2017	             && c->maxw == c->minw && c->maxh == c->minh);
2018}
2019
2020void
2021updatetitle(Client *c) {
2022	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2023		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2024	if(c->name[0] == '\0') /* hack to mark broken clients */
2025		strcpy(c->name, broken);
2026}
2027
2028void
2029updatestatus(void) {
2030	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2031		strcpy(stext, "dwm-"VERSION);
2032	drawbar(selmon);
2033}
2034
2035void
2036updatewindowtype(Client *c) {
2037	Atom state = getatomprop(c, netatom[NetWMState]);
2038	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2039
2040	if(state == netatom[NetWMFullscreen])
2041		setfullscreen(c, True);
2042	if(wtype == netatom[NetWMWindowTypeDialog])
2043		c->isfloating = True;
2044}
2045
2046void
2047updatewmhints(Client *c) {
2048	XWMHints *wmh;
2049
2050	if((wmh = XGetWMHints(dpy, c->win))) {
2051		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2052			wmh->flags &= ~XUrgencyHint;
2053			XSetWMHints(dpy, c->win, wmh);
2054		}
2055		else
2056			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2057		if(wmh->flags & InputHint)
2058			c->neverfocus = !wmh->input;
2059		else
2060			c->neverfocus = False;
2061		XFree(wmh);
2062	}
2063}
2064
2065void
2066view(const Arg *arg) {
2067	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2068		return;
2069	selmon->seltags ^= 1; /* toggle sel tagset */
2070	if(arg->ui & TAGMASK)
2071		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2072	focus(NULL);
2073	arrange(selmon);
2074}
2075
2076Client *
2077wintoclient(Window w) {
2078	Client *c;
2079	Monitor *m;
2080
2081	for(m = mons; m; m = m->next)
2082		for(c = m->clients; c; c = c->next)
2083			if(c->win == w)
2084				return c;
2085	return NULL;
2086}
2087
2088Monitor *
2089wintomon(Window w) {
2090	int x, y;
2091	Client *c;
2092	Monitor *m;
2093
2094	if(w == root && getrootptr(&x, &y))
2095		return recttomon(x, y, 1, 1);
2096	for(m = mons; m; m = m->next)
2097		if(w == m->barwin)
2098			return m;
2099	if((c = wintoclient(w)))
2100		return c->mon;
2101	return selmon;
2102}
2103
2104/* There's no way to check accesses to destroyed windows, thus those cases are
2105 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2106 * default error handler, which may call exit.  */
2107int
2108xerror(Display *dpy, XErrorEvent *ee) {
2109	if(ee->error_code == BadWindow
2110	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2111	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2112	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2113	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2114	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2115	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2116	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2117	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2118		return 0;
2119	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2120			ee->request_code, ee->error_code);
2121	return xerrorxlib(dpy, ee); /* may call exit */
2122}
2123
2124int
2125xerrordummy(Display *dpy, XErrorEvent *ee) {
2126	return 0;
2127}
2128
2129/* Startup Error handler to check if another window manager
2130 * is already running. */
2131int
2132xerrorstart(Display *dpy, XErrorEvent *ee) {
2133	die("dwm: another window manager is already running\n");
2134	return -1;
2135}
2136
2137void
2138zoom(const Arg *arg) {
2139	Client *c = selmon->sel;
2140
2141	if(!selmon->lt[selmon->sellt]->arrange
2142	|| (selmon->sel && selmon->sel->isfloating))
2143		return;
2144	if(c == nexttiled(selmon->clients))
2145		if(!c || !(c = nexttiled(c->next)))
2146			return;
2147	pop(c);
2148}
2149
2150int
2151main(int argc, char *argv[]) {
2152	if(argc == 2 && !strcmp("-v", argv[1]))
2153		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2154	else if(argc != 1)
2155		die("usage: dwm [-v]\n");
2156	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2157		fputs("warning: no locale support\n", stderr);
2158	if(!(dpy = XOpenDisplay(NULL)))
2159		die("dwm: cannot open display\n");
2160	checkotherwm();
2161	setup();
2162	scan();
2163	run();
2164	cleanup();
2165	XCloseDisplay(dpy);
2166	return EXIT_SUCCESS;
2167}