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#include "drw.h"
  44#include "util.h"
  45
  46/* macros */
  47#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  48#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  49#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  50                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  51#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  52#define LENGTH(X)               (sizeof X / sizeof X[0])
  53#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  54#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  55#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  56#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  57#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  58
  59/* enums */
  60enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  61enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  62enum { NetSupported, NetWMName, NetWMState,
  63       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  64       NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  65enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  66enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  67       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  68
  69typedef union {
  70	int i;
  71	unsigned int ui;
  72	float f;
  73	const void *v;
  74} Arg;
  75
  76typedef struct {
  77	unsigned int click;
  78	unsigned int mask;
  79	unsigned int button;
  80	void (*func)(const Arg *arg);
  81	const Arg arg;
  82} Button;
  83
  84typedef struct Monitor Monitor;
  85typedef struct Client Client;
  86struct Client {
  87	char name[256];
  88	float mina, maxa;
  89	int x, y, w, h;
  90	int oldx, oldy, oldw, oldh;
  91	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  92	int bw, oldbw;
  93	unsigned int tags;
  94	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  95	Client *next;
  96	Client *snext;
  97	Monitor *mon;
  98	Window win;
  99};
 100
 101typedef struct {
 102	int x, y, w, h;
 103	unsigned long norm[ColLast];
 104	unsigned long sel[ColLast];
 105	Drawable drawable;
 106	GC gc;
 107	struct {
 108		int ascent;
 109		int descent;
 110		int height;
 111		XFontSet set;
 112		XFontStruct *xfont;
 113	} font;
 114} DC; /* draw context */
 115
 116typedef struct {
 117	unsigned int mod;
 118	KeySym keysym;
 119	void (*func)(const Arg *);
 120	const Arg arg;
 121} Key;
 122
 123typedef struct {
 124	const char *symbol;
 125	void (*arrange)(Monitor *);
 126} Layout;
 127
 128struct Monitor {
 129	char ltsymbol[16];
 130	float mfact;
 131	int nmaster;
 132	int num;
 133	int by;               /* bar geometry */
 134	int mx, my, mw, mh;   /* screen size */
 135	int wx, wy, ww, wh;   /* window area  */
 136	unsigned int seltags;
 137	unsigned int sellt;
 138	unsigned int tagset[2];
 139	Bool showbar;
 140	Bool topbar;
 141	Client *clients;
 142	Client *sel;
 143	Client *stack;
 144	Monitor *next;
 145	Window barwin;
 146	const Layout *lt[2];
 147};
 148
 149typedef struct {
 150	const char *class;
 151	const char *instance;
 152	const char *title;
 153	unsigned int tags;
 154	Bool isfloating;
 155	int monitor;
 156} Rule;
 157
 158/* function declarations */
 159static void applyrules(Client *c);
 160static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 161static void arrange(Monitor *m);
 162static void arrangemon(Monitor *m);
 163static void attach(Client *c);
 164static void attachstack(Client *c);
 165static void buttonpress(XEvent *e);
 166static void checkotherwm(void);
 167static void cleanup(void);
 168static void cleanupmon(Monitor *mon);
 169static void clearurgent(Client *c);
 170static void clientmessage(XEvent *e);
 171static void configure(Client *c);
 172static void configurenotify(XEvent *e);
 173static void configurerequest(XEvent *e);
 174static Monitor *createmon(void);
 175static void destroynotify(XEvent *e);
 176static void detach(Client *c);
 177static void detachstack(Client *c);
 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 Bool 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	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
 696Monitor *
 697dirtomon(int dir) {
 698	Monitor *m = NULL;
 699
 700	if(dir > 0) {
 701		if(!(m = selmon->next))
 702			m = mons;
 703	}
 704	else if(selmon == mons)
 705		for(m = mons; m->next; m = m->next);
 706	else
 707		for(m = mons; m->next != selmon; m = m->next);
 708	return m;
 709}
 710
 711void
 712drawbar(Monitor *m) {
 713	int x;
 714	unsigned int i, occ = 0, urg = 0;
 715	unsigned long *col;
 716	Client *c;
 717
 718	for(c = m->clients; c; c = c->next) {
 719		occ |= c->tags;
 720		if(c->isurgent)
 721			urg |= c->tags;
 722	}
 723	dc.x = 0;
 724	for(i = 0; i < LENGTH(tags); i++) {
 725		dc.w = TEXTW(tags[i]);
 726		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 727		drawtext(tags[i], col, urg & 1 << i);
 728		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 729		           occ & 1 << i, urg & 1 << i, col);
 730		dc.x += dc.w;
 731	}
 732	dc.w = blw = TEXTW(m->ltsymbol);
 733	drawtext(m->ltsymbol, dc.norm, False);
 734	dc.x += dc.w;
 735	x = dc.x;
 736	if(m == selmon) { /* status is only drawn on selected monitor */
 737		dc.w = TEXTW(stext);
 738		dc.x = m->ww - dc.w;
 739		if(dc.x < x) {
 740			dc.x = x;
 741			dc.w = m->ww - x;
 742		}
 743		drawtext(stext, dc.norm, False);
 744	}
 745	else
 746		dc.x = m->ww;
 747	if((dc.w = dc.x - x) > bh) {
 748		dc.x = x;
 749		if(m->sel) {
 750			col = m == selmon ? dc.sel : dc.norm;
 751			drawtext(m->sel->name, col, False);
 752			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 753		}
 754		else
 755			drawtext(NULL, dc.norm, False);
 756	}
 757	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 758	XSync(dpy, False);
 759}
 760
 761void
 762drawbars(void) {
 763	Monitor *m;
 764
 765	for(m = mons; m; m = m->next)
 766		drawbar(m);
 767}
 768
 769void
 770drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 771	int x;
 772
 773	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 774	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 775	if(filled)
 776		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 777	else if(empty)
 778		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 779}
 780
 781void
 782drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 783	char buf[256];
 784	int i, x, y, h, len, olen;
 785
 786	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 787	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 788	if(!text)
 789		return;
 790	olen = strlen(text);
 791	h = dc.font.ascent + dc.font.descent;
 792	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 793	x = dc.x + (h / 2);
 794	/* shorten text if necessary */
 795	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 796	if(!len)
 797		return;
 798	memcpy(buf, text, len);
 799	if(len < olen)
 800		for(i = len; i && i > len - 3; buf[--i] = '.');
 801	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 802	if(dc.font.set)
 803		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 804	else
 805		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 806}
 807
 808void
 809enternotify(XEvent *e) {
 810	Client *c;
 811	Monitor *m;
 812	XCrossingEvent *ev = &e->xcrossing;
 813
 814	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 815		return;
 816	c = wintoclient(ev->window);
 817	m = c ? c->mon : wintomon(ev->window);
 818	if(m != selmon) {
 819		unfocus(selmon->sel, True);
 820		selmon = m;
 821	}
 822	else if(!c || c == selmon->sel)
 823		return;
 824	focus(c);
 825}
 826
 827void
 828expose(XEvent *e) {
 829	Monitor *m;
 830	XExposeEvent *ev = &e->xexpose;
 831
 832	if(ev->count == 0 && (m = wintomon(ev->window)))
 833		drawbar(m);
 834}
 835
 836void
 837focus(Client *c) {
 838	if(!c || !ISVISIBLE(c))
 839		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 840	/* was if(selmon->sel) */
 841	if(selmon->sel && selmon->sel != c)
 842		unfocus(selmon->sel, False);
 843	if(c) {
 844		if(c->mon != selmon)
 845			selmon = c->mon;
 846		if(c->isurgent)
 847			clearurgent(c);
 848		detachstack(c);
 849		attachstack(c);
 850		grabbuttons(c, True);
 851		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 852		setfocus(c);
 853	}
 854	else {
 855		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 856		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 857	}
 858	selmon->sel = c;
 859	drawbars();
 860}
 861
 862void
 863focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 864	XFocusChangeEvent *ev = &e->xfocus;
 865
 866	if(selmon->sel && ev->window != selmon->sel->win)
 867		setfocus(selmon->sel);
 868}
 869
 870void
 871focusmon(const Arg *arg) {
 872	Monitor *m;
 873
 874	if(!mons->next)
 875		return;
 876	if((m = dirtomon(arg->i)) == selmon)
 877		return;
 878	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 879					in gedit and anjuta */
 880	selmon = m;
 881	focus(NULL);
 882}
 883
 884void
 885focusstack(const Arg *arg) {
 886	Client *c = NULL, *i;
 887
 888	if(!selmon->sel)
 889		return;
 890	if(arg->i > 0) {
 891		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 892		if(!c)
 893			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 894	}
 895	else {
 896		for(i = selmon->clients; i != selmon->sel; i = i->next)
 897			if(ISVISIBLE(i))
 898				c = i;
 899		if(!c)
 900			for(; i; i = i->next)
 901				if(ISVISIBLE(i))
 902					c = i;
 903	}
 904	if(c) {
 905		focus(c);
 906		restack(selmon);
 907	}
 908}
 909
 910Atom
 911getatomprop(Client *c, Atom prop) {
 912	int di;
 913	unsigned long dl;
 914	unsigned char *p = NULL;
 915	Atom da, atom = None;
 916
 917	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 918	                      &da, &di, &dl, &dl, &p) == Success && p) {
 919		atom = *(Atom *)p;
 920		XFree(p);
 921	}
 922	return atom;
 923}
 924
 925unsigned long
 926getcolor(const char *colstr) {
 927	Colormap cmap = DefaultColormap(dpy, screen);
 928	XColor color;
 929
 930	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 931		die("error, cannot allocate color '%s'\n", colstr);
 932	return color.pixel;
 933}
 934
 935Bool
 936getrootptr(int *x, int *y) {
 937	int di;
 938	unsigned int dui;
 939	Window dummy;
 940
 941	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 942}
 943
 944long
 945getstate(Window w) {
 946	int format;
 947	long result = -1;
 948	unsigned char *p = NULL;
 949	unsigned long n, extra;
 950	Atom real;
 951
 952	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 953	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 954		return -1;
 955	if(n != 0)
 956		result = *p;
 957	XFree(p);
 958	return result;
 959}
 960
 961Bool
 962gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 963	char **list = NULL;
 964	int n;
 965	XTextProperty name;
 966
 967	if(!text || size == 0)
 968		return False;
 969	text[0] = '\0';
 970	XGetTextProperty(dpy, w, &name, atom);
 971	if(!name.nitems)
 972		return False;
 973	if(name.encoding == XA_STRING)
 974		strncpy(text, (char *)name.value, size - 1);
 975	else {
 976		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 977			strncpy(text, *list, size - 1);
 978			XFreeStringList(list);
 979		}
 980	}
 981	text[size - 1] = '\0';
 982	XFree(name.value);
 983	return True;
 984}
 985
 986void
 987grabbuttons(Client *c, Bool focused) {
 988	updatenumlockmask();
 989	{
 990		unsigned int i, j;
 991		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 992		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 993		if(focused) {
 994			for(i = 0; i < LENGTH(buttons); i++)
 995				if(buttons[i].click == ClkClientWin)
 996					for(j = 0; j < LENGTH(modifiers); j++)
 997						XGrabButton(dpy, buttons[i].button,
 998						            buttons[i].mask | modifiers[j],
 999						            c->win, False, BUTTONMASK,
1000						            GrabModeAsync, GrabModeSync, None, None);
1001		}
1002		else
1003			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1004			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1005	}
1006}
1007
1008void
1009grabkeys(void) {
1010	updatenumlockmask();
1011	{
1012		unsigned int i, j;
1013		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1014		KeyCode code;
1015
1016		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1017		for(i = 0; i < LENGTH(keys); i++)
1018			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1019				for(j = 0; j < LENGTH(modifiers); j++)
1020					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1021						 True, GrabModeAsync, GrabModeAsync);
1022	}
1023}
1024
1025void
1026incnmaster(const Arg *arg) {
1027	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1028	arrange(selmon);
1029}
1030
1031void
1032initfont(const char *fontstr) {
1033	char *def, **missing;
1034	int n;
1035
1036	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1037	if(missing) {
1038		while(n--)
1039			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1040		XFreeStringList(missing);
1041	}
1042	if(dc.font.set) {
1043		XFontStruct **xfonts;
1044		char **font_names;
1045
1046		dc.font.ascent = dc.font.descent = 0;
1047		XExtentsOfFontSet(dc.font.set);
1048		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1049		while(n--) {
1050			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1051			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1052			xfonts++;
1053		}
1054	}
1055	else {
1056		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1057		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1058			die("error, cannot load font: '%s'\n", fontstr);
1059		dc.font.ascent = dc.font.xfont->ascent;
1060		dc.font.descent = dc.font.xfont->descent;
1061	}
1062	dc.font.height = dc.font.ascent + dc.font.descent;
1063}
1064
1065#ifdef XINERAMA
1066static Bool
1067isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1068	while(n--)
1069		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1070		&& unique[n].width == info->width && unique[n].height == info->height)
1071			return False;
1072	return True;
1073}
1074#endif /* XINERAMA */
1075
1076void
1077keypress(XEvent *e) {
1078	unsigned int i;
1079	KeySym keysym;
1080	XKeyEvent *ev;
1081
1082	ev = &e->xkey;
1083	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1084	for(i = 0; i < LENGTH(keys); i++)
1085		if(keysym == keys[i].keysym
1086		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1087		&& keys[i].func)
1088			keys[i].func(&(keys[i].arg));
1089}
1090
1091void
1092killclient(const Arg *arg) {
1093	if(!selmon->sel)
1094		return;
1095	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1096		XGrabServer(dpy);
1097		XSetErrorHandler(xerrordummy);
1098		XSetCloseDownMode(dpy, DestroyAll);
1099		XKillClient(dpy, selmon->sel->win);
1100		XSync(dpy, False);
1101		XSetErrorHandler(xerror);
1102		XUngrabServer(dpy);
1103	}
1104}
1105
1106void
1107manage(Window w, XWindowAttributes *wa) {
1108	Client *c, *t = NULL;
1109	Window trans = None;
1110	XWindowChanges wc;
1111
1112	if(!(c = calloc(1, sizeof(Client))))
1113		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1114	c->win = w;
1115	updatetitle(c);
1116	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1117		c->mon = t->mon;
1118		c->tags = t->tags;
1119	}
1120	else {
1121		c->mon = selmon;
1122		applyrules(c);
1123	}
1124	/* geometry */
1125	c->x = c->oldx = wa->x;
1126	c->y = c->oldy = wa->y;
1127	c->w = c->oldw = wa->width;
1128	c->h = c->oldh = wa->height;
1129	c->oldbw = wa->border_width;
1130
1131	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1132		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1133	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1134		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1135	c->x = MAX(c->x, c->mon->mx);
1136	/* only fix client y-offset, if the client center might cover the bar */
1137	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1138	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1139	c->bw = borderpx;
1140
1141	wc.border_width = c->bw;
1142	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1143	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1144	configure(c); /* propagates border_width, if size doesn't change */
1145	updatewindowtype(c);
1146	updatesizehints(c);
1147	updatewmhints(c);
1148	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1149	grabbuttons(c, False);
1150	if(!c->isfloating)
1151		c->isfloating = c->oldstate = trans != None || c->isfixed;
1152	if(c->isfloating)
1153		XRaiseWindow(dpy, c->win);
1154	attach(c);
1155	attachstack(c);
1156	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1157	                (unsigned char *) &(c->win), 1);
1158	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1159	setclientstate(c, NormalState);
1160	if (c->mon == selmon)
1161		unfocus(selmon->sel, False);
1162	c->mon->sel = c;
1163	arrange(c->mon);
1164	XMapWindow(dpy, c->win);
1165	focus(NULL);
1166}
1167
1168void
1169mappingnotify(XEvent *e) {
1170	XMappingEvent *ev = &e->xmapping;
1171
1172	XRefreshKeyboardMapping(ev);
1173	if(ev->request == MappingKeyboard)
1174		grabkeys();
1175}
1176
1177void
1178maprequest(XEvent *e) {
1179	static XWindowAttributes wa;
1180	XMapRequestEvent *ev = &e->xmaprequest;
1181
1182	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1183		return;
1184	if(wa.override_redirect)
1185		return;
1186	if(!wintoclient(ev->window))
1187		manage(ev->window, &wa);
1188}
1189
1190void
1191monocle(Monitor *m) {
1192	unsigned int n = 0;
1193	Client *c;
1194
1195	for(c = m->clients; c; c = c->next)
1196		if(ISVISIBLE(c))
1197			n++;
1198	if(n > 0) /* override layout symbol */
1199		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1200	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1201		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1202}
1203
1204void
1205motionnotify(XEvent *e) {
1206	static Monitor *mon = NULL;
1207	Monitor *m;
1208	XMotionEvent *ev = &e->xmotion;
1209
1210	if(ev->window != root)
1211		return;
1212	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1213		unfocus(selmon->sel, True);
1214		selmon = m;
1215		focus(NULL);
1216	}
1217	mon = m;
1218}
1219
1220void
1221movemouse(const Arg *arg) {
1222	int x, y, ocx, ocy, nx, ny;
1223	Client *c;
1224	Monitor *m;
1225	XEvent ev;
1226
1227	if(!(c = selmon->sel))
1228		return;
1229	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1230		return;
1231	restack(selmon);
1232	ocx = c->x;
1233	ocy = c->y;
1234	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1235	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1236		return;
1237	if(!getrootptr(&x, &y))
1238		return;
1239	do {
1240		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1241		switch(ev.type) {
1242		case ConfigureRequest:
1243		case Expose:
1244		case MapRequest:
1245			handler[ev.type](&ev);
1246			break;
1247		case MotionNotify:
1248			nx = ocx + (ev.xmotion.x - x);
1249			ny = ocy + (ev.xmotion.y - y);
1250			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1251			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1252				if(abs(selmon->wx - nx) < snap)
1253					nx = selmon->wx;
1254				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1255					nx = selmon->wx + selmon->ww - WIDTH(c);
1256				if(abs(selmon->wy - ny) < snap)
1257					ny = selmon->wy;
1258				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1259					ny = selmon->wy + selmon->wh - HEIGHT(c);
1260				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1261				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1262					togglefloating(NULL);
1263			}
1264			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1265				resize(c, nx, ny, c->w, c->h, True);
1266			break;
1267		}
1268	} while(ev.type != ButtonRelease);
1269	XUngrabPointer(dpy, CurrentTime);
1270	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1271		sendmon(c, m);
1272		selmon = m;
1273		focus(NULL);
1274	}
1275}
1276
1277Client *
1278nexttiled(Client *c) {
1279	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1280	return c;
1281}
1282
1283void
1284pop(Client *c) {
1285	detach(c);
1286	attach(c);
1287	focus(c);
1288	arrange(c->mon);
1289}
1290
1291void
1292propertynotify(XEvent *e) {
1293	Client *c;
1294	Window trans;
1295	XPropertyEvent *ev = &e->xproperty;
1296
1297	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1298		updatestatus();
1299	else if(ev->state == PropertyDelete)
1300		return; /* ignore */
1301	else if((c = wintoclient(ev->window))) {
1302		switch(ev->atom) {
1303		default: break;
1304		case XA_WM_TRANSIENT_FOR:
1305			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1306			   (c->isfloating = (wintoclient(trans)) != NULL))
1307				arrange(c->mon);
1308			break;
1309		case XA_WM_NORMAL_HINTS:
1310			updatesizehints(c);
1311			break;
1312		case XA_WM_HINTS:
1313			updatewmhints(c);
1314			drawbars();
1315			break;
1316		}
1317		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1318			updatetitle(c);
1319			if(c == c->mon->sel)
1320				drawbar(c->mon);
1321		}
1322		if(ev->atom == netatom[NetWMWindowType])
1323			updatewindowtype(c);
1324	}
1325}
1326
1327void
1328quit(const Arg *arg) {
1329	running = False;
1330}
1331
1332Monitor *
1333recttomon(int x, int y, int w, int h) {
1334	Monitor *m, *r = selmon;
1335	int a, area = 0;
1336
1337	for(m = mons; m; m = m->next)
1338		if((a = INTERSECT(x, y, w, h, m)) > area) {
1339			area = a;
1340			r = m;
1341		}
1342	return r;
1343}
1344
1345void
1346resize(Client *c, int x, int y, int w, int h, Bool interact) {
1347	if(applysizehints(c, &x, &y, &w, &h, interact))
1348		resizeclient(c, x, y, w, h);
1349}
1350
1351void
1352resizeclient(Client *c, int x, int y, int w, int h) {
1353	XWindowChanges wc;
1354
1355	c->oldx = c->x; c->x = wc.x = x;
1356	c->oldy = c->y; c->y = wc.y = y;
1357	c->oldw = c->w; c->w = wc.width = w;
1358	c->oldh = c->h; c->h = wc.height = h;
1359	wc.border_width = c->bw;
1360	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1361	configure(c);
1362	XSync(dpy, False);
1363}
1364
1365void
1366resizemouse(const Arg *arg) {
1367	int ocx, ocy;
1368	int nw, nh;
1369	Client *c;
1370	Monitor *m;
1371	XEvent ev;
1372
1373	if(!(c = selmon->sel))
1374		return;
1375	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1376		return;
1377	restack(selmon);
1378	ocx = c->x;
1379	ocy = c->y;
1380	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1381	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1382		return;
1383	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1384	do {
1385		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1386		switch(ev.type) {
1387		case ConfigureRequest:
1388		case Expose:
1389		case MapRequest:
1390			handler[ev.type](&ev);
1391			break;
1392		case MotionNotify:
1393			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1394			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1395			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1396			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1397			{
1398				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1399				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1400					togglefloating(NULL);
1401			}
1402			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1403				resize(c, c->x, c->y, nw, nh, True);
1404			break;
1405		}
1406	} while(ev.type != ButtonRelease);
1407	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1408	XUngrabPointer(dpy, CurrentTime);
1409	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1410	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1411		sendmon(c, m);
1412		selmon = m;
1413		focus(NULL);
1414	}
1415}
1416
1417void
1418restack(Monitor *m) {
1419	Client *c;
1420	XEvent ev;
1421	XWindowChanges wc;
1422
1423	drawbar(m);
1424	if(!m->sel)
1425		return;
1426	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1427		XRaiseWindow(dpy, m->sel->win);
1428	if(m->lt[m->sellt]->arrange) {
1429		wc.stack_mode = Below;
1430		wc.sibling = m->barwin;
1431		for(c = m->stack; c; c = c->snext)
1432			if(!c->isfloating && ISVISIBLE(c)) {
1433				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1434				wc.sibling = c->win;
1435			}
1436	}
1437	XSync(dpy, False);
1438	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1439}
1440
1441void
1442run(void) {
1443	XEvent ev;
1444	/* main event loop */
1445	XSync(dpy, False);
1446	while(running && !XNextEvent(dpy, &ev))
1447		if(handler[ev.type])
1448			handler[ev.type](&ev); /* call handler */
1449}
1450
1451void
1452scan(void) {
1453	unsigned int i, num;
1454	Window d1, d2, *wins = NULL;
1455	XWindowAttributes wa;
1456
1457	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1458		for(i = 0; i < num; i++) {
1459			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1460			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1461				continue;
1462			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1463				manage(wins[i], &wa);
1464		}
1465		for(i = 0; i < num; i++) { /* now the transients */
1466			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1467				continue;
1468			if(XGetTransientForHint(dpy, wins[i], &d1)
1469			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1470				manage(wins[i], &wa);
1471		}
1472		if(wins)
1473			XFree(wins);
1474	}
1475}
1476
1477void
1478sendmon(Client *c, Monitor *m) {
1479	if(c->mon == m)
1480		return;
1481	unfocus(c, True);
1482	detach(c);
1483	detachstack(c);
1484	c->mon = m;
1485	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1486	attach(c);
1487	attachstack(c);
1488	focus(NULL);
1489	arrange(NULL);
1490}
1491
1492void
1493setclientstate(Client *c, long state) {
1494	long data[] = { state, None };
1495
1496	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1497			PropModeReplace, (unsigned char *)data, 2);
1498}
1499
1500Bool
1501sendevent(Client *c, Atom proto) {
1502	int n;
1503	Atom *protocols;
1504	Bool exists = False;
1505	XEvent ev;
1506
1507	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1508		while(!exists && n--)
1509			exists = protocols[n] == proto;
1510		XFree(protocols);
1511	}
1512	if(exists) {
1513		ev.type = ClientMessage;
1514		ev.xclient.window = c->win;
1515		ev.xclient.message_type = wmatom[WMProtocols];
1516		ev.xclient.format = 32;
1517		ev.xclient.data.l[0] = proto;
1518		ev.xclient.data.l[1] = CurrentTime;
1519		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1520	}
1521	return exists;
1522}
1523
1524void
1525setfocus(Client *c) {
1526	if(!c->neverfocus) {
1527		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1528		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1529 		                XA_WINDOW, 32, PropModeReplace,
1530 		                (unsigned char *) &(c->win), 1);
1531	}
1532	sendevent(c, wmatom[WMTakeFocus]);
1533}
1534
1535void
1536setfullscreen(Client *c, Bool fullscreen) {
1537	if(fullscreen) {
1538		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1539		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1540		c->isfullscreen = True;
1541		c->oldstate = c->isfloating;
1542		c->oldbw = c->bw;
1543		c->bw = 0;
1544		c->isfloating = True;
1545		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1546		XRaiseWindow(dpy, c->win);
1547	}
1548	else {
1549		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1550		                PropModeReplace, (unsigned char*)0, 0);
1551		c->isfullscreen = False;
1552		c->isfloating = c->oldstate;
1553		c->bw = c->oldbw;
1554		c->x = c->oldx;
1555		c->y = c->oldy;
1556		c->w = c->oldw;
1557		c->h = c->oldh;
1558		resizeclient(c, c->x, c->y, c->w, c->h);
1559		arrange(c->mon);
1560	}
1561}
1562
1563void
1564setlayout(const Arg *arg) {
1565	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1566		selmon->sellt ^= 1;
1567	if(arg && arg->v)
1568		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1569	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1570	if(selmon->sel)
1571		arrange(selmon);
1572	else
1573		drawbar(selmon);
1574}
1575
1576/* arg > 1.0 will set mfact absolutly */
1577void
1578setmfact(const Arg *arg) {
1579	float f;
1580
1581	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1582		return;
1583	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1584	if(f < 0.1 || f > 0.9)
1585		return;
1586	selmon->mfact = f;
1587	arrange(selmon);
1588}
1589
1590void
1591setup(void) {
1592	XSetWindowAttributes wa;
1593
1594	/* clean up any zombies immediately */
1595	sigchld(0);
1596
1597	/* init screen */
1598	screen = DefaultScreen(dpy);
1599	root = RootWindow(dpy, screen);
1600	initfont(font);
1601	sw = DisplayWidth(dpy, screen);
1602	sh = DisplayHeight(dpy, screen);
1603	bh = dc.h = dc.font.height + 2;
1604	updategeom();
1605	/* init atoms */
1606	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1607	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1608	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1609	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1610	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1611	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1612	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1613	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1614	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1615	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1616	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1617	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1618	/* init cursors */
1619	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1620	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1621	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1622	/* init appearance */
1623	dc.norm[ColBorder] = getcolor(normbordercolor);
1624	dc.norm[ColBG] = getcolor(normbgcolor);
1625	dc.norm[ColFG] = getcolor(normfgcolor);
1626	dc.sel[ColBorder] = getcolor(selbordercolor);
1627	dc.sel[ColBG] = getcolor(selbgcolor);
1628	dc.sel[ColFG] = getcolor(selfgcolor);
1629	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1630	dc.gc = XCreateGC(dpy, root, 0, NULL);
1631	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1632	if(!dc.font.set)
1633		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1634	/* init bars */
1635	updatebars();
1636	updatestatus();
1637	/* EWMH support per view */
1638	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1639			PropModeReplace, (unsigned char *) netatom, NetLast);
1640	XDeleteProperty(dpy, root, netatom[NetClientList]);
1641	/* select for events */
1642	wa.cursor = cursor[CurNormal];
1643	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1644	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1645	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1646	XSelectInput(dpy, root, wa.event_mask);
1647	grabkeys();
1648}
1649
1650void
1651showhide(Client *c) {
1652	if(!c)
1653		return;
1654	if(ISVISIBLE(c)) { /* show clients top down */
1655		XMoveWindow(dpy, c->win, c->x, c->y);
1656		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1657			resize(c, c->x, c->y, c->w, c->h, False);
1658		showhide(c->snext);
1659	}
1660	else { /* hide clients bottom up */
1661		showhide(c->snext);
1662		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1663	}
1664}
1665
1666void
1667sigchld(int unused) {
1668	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1669		die("Can't install SIGCHLD handler");
1670	while(0 < waitpid(-1, NULL, WNOHANG));
1671}
1672
1673void
1674spawn(const Arg *arg) {
1675	if(fork() == 0) {
1676		if(dpy)
1677			close(ConnectionNumber(dpy));
1678		setsid();
1679		execvp(((char **)arg->v)[0], (char **)arg->v);
1680		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1681		perror(" failed");
1682		exit(EXIT_SUCCESS);
1683	}
1684}
1685
1686void
1687tag(const Arg *arg) {
1688	if(selmon->sel && arg->ui & TAGMASK) {
1689		selmon->sel->tags = arg->ui & TAGMASK;
1690		focus(NULL);
1691		arrange(selmon);
1692	}
1693}
1694
1695void
1696tagmon(const Arg *arg) {
1697	if(!selmon->sel || !mons->next)
1698		return;
1699	sendmon(selmon->sel, dirtomon(arg->i));
1700}
1701
1702int
1703textnw(const char *text, unsigned int len) {
1704	XRectangle r;
1705
1706	if(dc.font.set) {
1707		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1708		return r.width;
1709	}
1710	return XTextWidth(dc.font.xfont, text, len);
1711}
1712
1713void
1714tile(Monitor *m) {
1715	unsigned int i, n, h, mw, my, ty;
1716	Client *c;
1717
1718	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1719	if(n == 0)
1720		return;
1721
1722	if(n > m->nmaster)
1723		mw = m->nmaster ? m->ww * m->mfact : 0;
1724	else
1725		mw = m->ww;
1726	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1727		if(i < m->nmaster) {
1728			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1729			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1730			my += HEIGHT(c);
1731		}
1732		else {
1733			h = (m->wh - ty) / (n - i);
1734			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1735			ty += HEIGHT(c);
1736		}
1737}
1738
1739void
1740togglebar(const Arg *arg) {
1741	selmon->showbar = !selmon->showbar;
1742	updatebarpos(selmon);
1743	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1744	arrange(selmon);
1745}
1746
1747void
1748togglefloating(const Arg *arg) {
1749	if(!selmon->sel)
1750		return;
1751	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1752		return;
1753	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1754	if(selmon->sel->isfloating)
1755		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1756		       selmon->sel->w, selmon->sel->h, False);
1757	arrange(selmon);
1758}
1759
1760void
1761toggletag(const Arg *arg) {
1762	unsigned int newtags;
1763
1764	if(!selmon->sel)
1765		return;
1766	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1767	if(newtags) {
1768		selmon->sel->tags = newtags;
1769		focus(NULL);
1770		arrange(selmon);
1771	}
1772}
1773
1774void
1775toggleview(const Arg *arg) {
1776	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1777
1778	if(newtagset) {
1779		selmon->tagset[selmon->seltags] = newtagset;
1780		focus(NULL);
1781		arrange(selmon);
1782	}
1783}
1784
1785void
1786unfocus(Client *c, Bool setfocus) {
1787	if(!c)
1788		return;
1789	grabbuttons(c, False);
1790	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1791	if(setfocus) {
1792		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1793		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1794	}
1795}
1796
1797void
1798unmanage(Client *c, Bool destroyed) {
1799	Monitor *m = c->mon;
1800	XWindowChanges wc;
1801
1802	/* The server grab construct avoids race conditions. */
1803	detach(c);
1804	detachstack(c);
1805	if(!destroyed) {
1806		wc.border_width = c->oldbw;
1807		XGrabServer(dpy);
1808		XSetErrorHandler(xerrordummy);
1809		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1810		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1811		setclientstate(c, WithdrawnState);
1812		XSync(dpy, False);
1813		XSetErrorHandler(xerror);
1814		XUngrabServer(dpy);
1815	}
1816	free(c);
1817	focus(NULL);
1818	updateclientlist();
1819	arrange(m);
1820}
1821
1822void
1823unmapnotify(XEvent *e) {
1824	Client *c;
1825	XUnmapEvent *ev = &e->xunmap;
1826
1827	if((c = wintoclient(ev->window))) {
1828		if(ev->send_event)
1829			setclientstate(c, WithdrawnState);
1830		else
1831			unmanage(c, False);
1832	}
1833}
1834
1835void
1836updatebars(void) {
1837	Monitor *m;
1838	XSetWindowAttributes wa = {
1839		.override_redirect = True,
1840		.background_pixmap = ParentRelative,
1841		.event_mask = ButtonPressMask|ExposureMask
1842	};
1843	for(m = mons; m; m = m->next) {
1844		if (m->barwin)
1845			continue;
1846		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1847		                          CopyFromParent, DefaultVisual(dpy, screen),
1848		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1849		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1850		XMapRaised(dpy, m->barwin);
1851	}
1852}
1853
1854void
1855updatebarpos(Monitor *m) {
1856	m->wy = m->my;
1857	m->wh = m->mh;
1858	if(m->showbar) {
1859		m->wh -= bh;
1860		m->by = m->topbar ? m->wy : m->wy + m->wh;
1861		m->wy = m->topbar ? m->wy + bh : m->wy;
1862	}
1863	else
1864		m->by = -bh;
1865}
1866
1867void
1868updateclientlist() {
1869	Client *c;
1870	Monitor *m;
1871
1872	XDeleteProperty(dpy, root, netatom[NetClientList]);
1873	for(m = mons; m; m = m->next)
1874		for(c = m->clients; c; c = c->next)
1875			XChangeProperty(dpy, root, netatom[NetClientList],
1876			                XA_WINDOW, 32, PropModeAppend,
1877			                (unsigned char *) &(c->win), 1);
1878}
1879
1880Bool
1881updategeom(void) {
1882	Bool dirty = False;
1883
1884#ifdef XINERAMA
1885	if(XineramaIsActive(dpy)) {
1886		int i, j, n, nn;
1887		Client *c;
1888		Monitor *m;
1889		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1890		XineramaScreenInfo *unique = NULL;
1891
1892		for(n = 0, m = mons; m; m = m->next, n++);
1893		/* only consider unique geometries as separate screens */
1894		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1895			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1896		for(i = 0, j = 0; i < nn; i++)
1897			if(isuniquegeom(unique, j, &info[i]))
1898				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1899		XFree(info);
1900		nn = j;
1901		if(n <= nn) {
1902			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1903				for(m = mons; m && m->next; m = m->next);
1904				if(m)
1905					m->next = createmon();
1906				else
1907					mons = createmon();
1908			}
1909			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1910				if(i >= n
1911				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1912				    || unique[i].width != m->mw || unique[i].height != m->mh))
1913				{
1914					dirty = True;
1915					m->num = i;
1916					m->mx = m->wx = unique[i].x_org;
1917					m->my = m->wy = unique[i].y_org;
1918					m->mw = m->ww = unique[i].width;
1919					m->mh = m->wh = unique[i].height;
1920					updatebarpos(m);
1921				}
1922		}
1923		else { /* less monitors available nn < n */
1924			for(i = nn; i < n; i++) {
1925				for(m = mons; m && m->next; m = m->next);
1926				while(m->clients) {
1927					dirty = True;
1928					c = m->clients;
1929					m->clients = c->next;
1930					detachstack(c);
1931					c->mon = mons;
1932					attach(c);
1933					attachstack(c);
1934				}
1935				if(m == selmon)
1936					selmon = mons;
1937				cleanupmon(m);
1938			}
1939		}
1940		free(unique);
1941	}
1942	else
1943#endif /* XINERAMA */
1944	/* default monitor setup */
1945	{
1946		if(!mons)
1947			mons = createmon();
1948		if(mons->mw != sw || mons->mh != sh) {
1949			dirty = True;
1950			mons->mw = mons->ww = sw;
1951			mons->mh = mons->wh = sh;
1952			updatebarpos(mons);
1953		}
1954	}
1955	if(dirty) {
1956		selmon = mons;
1957		selmon = wintomon(root);
1958	}
1959	return dirty;
1960}
1961
1962void
1963updatenumlockmask(void) {
1964	unsigned int i, j;
1965	XModifierKeymap *modmap;
1966
1967	numlockmask = 0;
1968	modmap = XGetModifierMapping(dpy);
1969	for(i = 0; i < 8; i++)
1970		for(j = 0; j < modmap->max_keypermod; j++)
1971			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1972			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1973				numlockmask = (1 << i);
1974	XFreeModifiermap(modmap);
1975}
1976
1977void
1978updatesizehints(Client *c) {
1979	long msize;
1980	XSizeHints size;
1981
1982	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1983		/* size is uninitialized, ensure that size.flags aren't used */
1984		size.flags = PSize;
1985	if(size.flags & PBaseSize) {
1986		c->basew = size.base_width;
1987		c->baseh = size.base_height;
1988	}
1989	else if(size.flags & PMinSize) {
1990		c->basew = size.min_width;
1991		c->baseh = size.min_height;
1992	}
1993	else
1994		c->basew = c->baseh = 0;
1995	if(size.flags & PResizeInc) {
1996		c->incw = size.width_inc;
1997		c->inch = size.height_inc;
1998	}
1999	else
2000		c->incw = c->inch = 0;
2001	if(size.flags & PMaxSize) {
2002		c->maxw = size.max_width;
2003		c->maxh = size.max_height;
2004	}
2005	else
2006		c->maxw = c->maxh = 0;
2007	if(size.flags & PMinSize) {
2008		c->minw = size.min_width;
2009		c->minh = size.min_height;
2010	}
2011	else if(size.flags & PBaseSize) {
2012		c->minw = size.base_width;
2013		c->minh = size.base_height;
2014	}
2015	else
2016		c->minw = c->minh = 0;
2017	if(size.flags & PAspect) {
2018		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2019		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2020	}
2021	else
2022		c->maxa = c->mina = 0.0;
2023	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2024	             && c->maxw == c->minw && c->maxh == c->minh);
2025}
2026
2027void
2028updatetitle(Client *c) {
2029	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2030		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2031	if(c->name[0] == '\0') /* hack to mark broken clients */
2032		strcpy(c->name, broken);
2033}
2034
2035void
2036updatestatus(void) {
2037	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2038		strcpy(stext, "dwm-"VERSION);
2039	drawbar(selmon);
2040}
2041
2042void
2043updatewindowtype(Client *c) {
2044	Atom state = getatomprop(c, netatom[NetWMState]);
2045	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2046
2047	if(state == netatom[NetWMFullscreen])
2048		setfullscreen(c, True);
2049	if(wtype == netatom[NetWMWindowTypeDialog])
2050		c->isfloating = True;
2051}
2052
2053void
2054updatewmhints(Client *c) {
2055	XWMHints *wmh;
2056
2057	if((wmh = XGetWMHints(dpy, c->win))) {
2058		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2059			wmh->flags &= ~XUrgencyHint;
2060			XSetWMHints(dpy, c->win, wmh);
2061		}
2062		else
2063			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2064		if(wmh->flags & InputHint)
2065			c->neverfocus = !wmh->input;
2066		else
2067			c->neverfocus = False;
2068		XFree(wmh);
2069	}
2070}
2071
2072void
2073view(const Arg *arg) {
2074	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2075		return;
2076	selmon->seltags ^= 1; /* toggle sel tagset */
2077	if(arg->ui & TAGMASK)
2078		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2079	focus(NULL);
2080	arrange(selmon);
2081}
2082
2083Client *
2084wintoclient(Window w) {
2085	Client *c;
2086	Monitor *m;
2087
2088	for(m = mons; m; m = m->next)
2089		for(c = m->clients; c; c = c->next)
2090			if(c->win == w)
2091				return c;
2092	return NULL;
2093}
2094
2095Monitor *
2096wintomon(Window w) {
2097	int x, y;
2098	Client *c;
2099	Monitor *m;
2100
2101	if(w == root && getrootptr(&x, &y))
2102		return recttomon(x, y, 1, 1);
2103	for(m = mons; m; m = m->next)
2104		if(w == m->barwin)
2105			return m;
2106	if((c = wintoclient(w)))
2107		return c->mon;
2108	return selmon;
2109}
2110
2111/* There's no way to check accesses to destroyed windows, thus those cases are
2112 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2113 * default error handler, which may call exit.  */
2114int
2115xerror(Display *dpy, XErrorEvent *ee) {
2116	if(ee->error_code == BadWindow
2117	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2118	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2119	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2120	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2121	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2122	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2123	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2124	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2125		return 0;
2126	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2127			ee->request_code, ee->error_code);
2128	return xerrorxlib(dpy, ee); /* may call exit */
2129}
2130
2131int
2132xerrordummy(Display *dpy, XErrorEvent *ee) {
2133	return 0;
2134}
2135
2136/* Startup Error handler to check if another window manager
2137 * is already running. */
2138int
2139xerrorstart(Display *dpy, XErrorEvent *ee) {
2140	die("dwm: another window manager is already running\n");
2141	return -1;
2142}
2143
2144void
2145zoom(const Arg *arg) {
2146	Client *c = selmon->sel;
2147
2148	if(!selmon->lt[selmon->sellt]->arrange
2149	|| (selmon->sel && selmon->sel->isfloating))
2150		return;
2151	if(c == nexttiled(selmon->clients))
2152		if(!c || !(c = nexttiled(c->next)))
2153			return;
2154	pop(c);
2155}
2156
2157int
2158main(int argc, char *argv[]) {
2159	if(argc == 2 && !strcmp("-v", argv[1]))
2160		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2161	else if(argc != 1)
2162		die("usage: dwm [-v]\n");
2163	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2164		fputs("warning: no locale support\n", stderr);
2165	if(!(dpy = XOpenDisplay(NULL)))
2166		die("dwm: cannot open display\n");
2167	checkotherwm();
2168	setup();
2169	scan();
2170	run();
2171	cleanup();
2172	XCloseDisplay(dpy);
2173	return EXIT_SUCCESS;
2174}