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, 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 Bool updategeom(void);
 239static void updatebarpos(Monitor *m);
 240static void updatebars(void);
 241static void updatenumlockmask(void);
 242static void updatesizehints(Client *c);
 243static void updatestatus(void);
 244static void updatewindowtype(Client *c);
 245static void updatetitle(Client *c);
 246static void updatewmhints(Client *c);
 247static void view(const Arg *arg);
 248static Client *wintoclient(Window w);
 249static Monitor *wintomon(Window w);
 250static int xerror(Display *dpy, XErrorEvent *ee);
 251static int xerrordummy(Display *dpy, XErrorEvent *ee);
 252static int xerrorstart(Display *dpy, XErrorEvent *ee);
 253static void zoom(const Arg *arg);
 254
 255/* variables */
 256static const char broken[] = "broken";
 257static char stext[256];
 258static int screen;
 259static int sw, sh;           /* X display screen geometry width, height */
 260static int bh, blw = 0;      /* bar geometry */
 261static int (*xerrorxlib)(Display *, XErrorEvent *);
 262static unsigned int numlockmask = 0;
 263static void (*handler[LASTEvent]) (XEvent *) = {
 264	[ButtonPress] = buttonpress,
 265	[ClientMessage] = clientmessage,
 266	[ConfigureRequest] = configurerequest,
 267	[ConfigureNotify] = configurenotify,
 268	[DestroyNotify] = destroynotify,
 269	[EnterNotify] = enternotify,
 270	[Expose] = expose,
 271	[FocusIn] = focusin,
 272	[KeyPress] = keypress,
 273	[MappingNotify] = mappingnotify,
 274	[MapRequest] = maprequest,
 275	[MotionNotify] = motionnotify,
 276	[PropertyNotify] = propertynotify,
 277	[UnmapNotify] = unmapnotify
 278};
 279static Atom wmatom[WMLast], netatom[NetLast];
 280static Bool running = True;
 281static Cursor cursor[CurLast];
 282static Display *dpy;
 283static DC dc;
 284static Monitor *mons = NULL, *selmon = NULL;
 285static Window root;
 286
 287/* configuration, allows nested code to access above variables */
 288#include "config.h"
 289
 290/* compile-time check if all tags fit into an unsigned int bit array. */
 291struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 292
 293/* function implementations */
 294void
 295applyrules(Client *c) {
 296	const char *class, *instance;
 297	unsigned int i;
 298	const Rule *r;
 299	Monitor *m;
 300	XClassHint ch = { NULL, NULL };
 301
 302	/* rule matching */
 303	c->isfloating = c->tags = 0;
 304	XGetClassHint(dpy, c->win, &ch);
 305	class    = ch.res_class ? ch.res_class : broken;
 306	instance = ch.res_name  ? ch.res_name  : broken;
 307
 308	for(i = 0; i < LENGTH(rules); i++) {
 309		r = &rules[i];
 310		if((!r->title || strstr(c->name, r->title))
 311		&& (!r->class || strstr(class, r->class))
 312		&& (!r->instance || strstr(instance, r->instance)))
 313		{
 314			c->isfloating = r->isfloating;
 315			c->tags |= r->tags;
 316			for(m = mons; m && m->num != r->monitor; m = m->next);
 317			if(m)
 318				c->mon = m;
 319		}
 320	}
 321	if(ch.res_class)
 322		XFree(ch.res_class);
 323	if(ch.res_name)
 324		XFree(ch.res_name);
 325	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 326}
 327
 328Bool
 329applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 330	Bool baseismin;
 331	Monitor *m = c->mon;
 332
 333	/* set minimum possible */
 334	*w = MAX(1, *w);
 335	*h = MAX(1, *h);
 336	if(interact) {
 337		if(*x > sw)
 338			*x = sw - WIDTH(c);
 339		if(*y > sh)
 340			*y = sh - HEIGHT(c);
 341		if(*x + *w + 2 * c->bw < 0)
 342			*x = 0;
 343		if(*y + *h + 2 * c->bw < 0)
 344			*y = 0;
 345	}
 346	else {
 347		if(*x >= m->wx + m->ww)
 348			*x = m->wx + m->ww - WIDTH(c);
 349		if(*y >= m->wy + m->wh)
 350			*y = m->wy + m->wh - HEIGHT(c);
 351		if(*x + *w + 2 * c->bw <= m->wx)
 352			*x = m->wx;
 353		if(*y + *h + 2 * c->bw <= m->wy)
 354			*y = m->wy;
 355	}
 356	if(*h < bh)
 357		*h = bh;
 358	if(*w < bh)
 359		*w = bh;
 360	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 361		/* see last two sentences in ICCCM 4.1.2.3 */
 362		baseismin = c->basew == c->minw && c->baseh == c->minh;
 363		if(!baseismin) { /* temporarily remove base dimensions */
 364			*w -= c->basew;
 365			*h -= c->baseh;
 366		}
 367		/* adjust for aspect limits */
 368		if(c->mina > 0 && c->maxa > 0) {
 369			if(c->maxa < (float)*w / *h)
 370				*w = *h * c->maxa + 0.5;
 371			else if(c->mina < (float)*h / *w)
 372				*h = *w * c->mina + 0.5;
 373		}
 374		if(baseismin) { /* increment calculation requires this */
 375			*w -= c->basew;
 376			*h -= c->baseh;
 377		}
 378		/* adjust for increment value */
 379		if(c->incw)
 380			*w -= *w % c->incw;
 381		if(c->inch)
 382			*h -= *h % c->inch;
 383		/* restore base dimensions */
 384		*w = MAX(*w + c->basew, c->minw);
 385		*h = MAX(*h + c->baseh, c->minh);
 386		if(c->maxw)
 387			*w = MIN(*w, c->maxw);
 388		if(c->maxh)
 389			*h = MIN(*h, c->maxh);
 390	}
 391	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 392}
 393
 394void
 395arrange(Monitor *m) {
 396	if(m)
 397		showhide(m->stack);
 398	else for(m = mons; m; m = m->next)
 399		showhide(m->stack);
 400	if(m) {
 401		arrangemon(m);
 402		restack(m);
 403	} else for(m = mons; m; m = m->next)
 404		arrangemon(m);
 405}
 406
 407void
 408arrangemon(Monitor *m) {
 409	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 410	if(m->lt[m->sellt]->arrange)
 411		m->lt[m->sellt]->arrange(m);
 412}
 413
 414void
 415attach(Client *c) {
 416	c->next = c->mon->clients;
 417	c->mon->clients = c;
 418}
 419
 420void
 421attachstack(Client *c) {
 422	c->snext = c->mon->stack;
 423	c->mon->stack = c;
 424}
 425
 426void
 427buttonpress(XEvent *e) {
 428	unsigned int i, x, click;
 429	Arg arg = {0};
 430	Client *c;
 431	Monitor *m;
 432	XButtonPressedEvent *ev = &e->xbutton;
 433
 434	click = ClkRootWin;
 435	/* focus monitor if necessary */
 436	if((m = wintomon(ev->window)) && m != selmon) {
 437		unfocus(selmon->sel, True);
 438		selmon = m;
 439		focus(NULL);
 440	}
 441	if(ev->window == selmon->barwin) {
 442		i = x = 0;
 443		do
 444			x += TEXTW(tags[i]);
 445		while(ev->x >= x && ++i < LENGTH(tags));
 446		if(i < LENGTH(tags)) {
 447			click = ClkTagBar;
 448			arg.ui = 1 << i;
 449		}
 450		else if(ev->x < x + blw)
 451			click = ClkLtSymbol;
 452		else if(ev->x > selmon->ww - TEXTW(stext))
 453			click = ClkStatusText;
 454		else
 455			click = ClkWinTitle;
 456	}
 457	else if((c = wintoclient(ev->window))) {
 458		focus(c);
 459		click = ClkClientWin;
 460	}
 461	for(i = 0; i < LENGTH(buttons); i++)
 462		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 463		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 464			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 465}
 466
 467void
 468checkotherwm(void) {
 469	xerrorxlib = XSetErrorHandler(xerrorstart);
 470	/* this causes an error if some other window manager is running */
 471	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 472	XSync(dpy, False);
 473	XSetErrorHandler(xerror);
 474	XSync(dpy, False);
 475}
 476
 477void
 478cleanup(void) {
 479	Arg a = {.ui = ~0};
 480	Layout foo = { "", NULL };
 481	Monitor *m;
 482
 483	view(&a);
 484	selmon->lt[selmon->sellt] = &foo;
 485	for(m = mons; m; m = m->next)
 486		while(m->stack)
 487			unmanage(m->stack, False);
 488	if(dc.font.set)
 489		XFreeFontSet(dpy, dc.font.set);
 490	else
 491		XFreeFont(dpy, dc.font.xfont);
 492	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 493	XFreePixmap(dpy, dc.drawable);
 494	XFreeGC(dpy, dc.gc);
 495	XFreeCursor(dpy, cursor[CurNormal]);
 496	XFreeCursor(dpy, cursor[CurResize]);
 497	XFreeCursor(dpy, cursor[CurMove]);
 498	while(mons)
 499		cleanupmon(mons);
 500	XSync(dpy, False);
 501	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 502	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 503}
 504
 505void
 506cleanupmon(Monitor *mon) {
 507	Monitor *m;
 508
 509	if(mon == mons)
 510		mons = mons->next;
 511	else {
 512		for(m = mons; m && m->next != mon; m = m->next);
 513		m->next = mon->next;
 514	}
 515	XUnmapWindow(dpy, mon->barwin);
 516	XDestroyWindow(dpy, mon->barwin);
 517	free(mon);
 518}
 519
 520void
 521clearurgent(Client *c) {
 522	XWMHints *wmh;
 523
 524	c->isurgent = False;
 525	if(!(wmh = XGetWMHints(dpy, c->win)))
 526		return;
 527	wmh->flags &= ~XUrgencyHint;
 528	XSetWMHints(dpy, c->win, wmh);
 529	XFree(wmh);
 530}
 531
 532void
 533clientmessage(XEvent *e) {
 534	XClientMessageEvent *cme = &e->xclient;
 535	Client *c = wintoclient(cme->window);
 536
 537	if(!c)
 538		return;
 539	if(cme->message_type == netatom[NetWMState]) {
 540		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 541			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 542			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 543	}
 544	else if(cme->message_type == netatom[NetActiveWindow]) {
 545		if(!ISVISIBLE(c)) {
 546			c->mon->seltags ^= 1;
 547			c->mon->tagset[c->mon->seltags] = c->tags;
 548		}
 549		pop(c);
 550	}
 551}
 552
 553void
 554configure(Client *c) {
 555	XConfigureEvent ce;
 556
 557	ce.type = ConfigureNotify;
 558	ce.display = dpy;
 559	ce.event = c->win;
 560	ce.window = c->win;
 561	ce.x = c->x;
 562	ce.y = c->y;
 563	ce.width = c->w;
 564	ce.height = c->h;
 565	ce.border_width = c->bw;
 566	ce.above = None;
 567	ce.override_redirect = False;
 568	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 569}
 570
 571void
 572configurenotify(XEvent *e) {
 573	Monitor *m;
 574	XConfigureEvent *ev = &e->xconfigure;
 575	Bool dirty;
 576
 577	if(ev->window == root) {
 578		dirty = (sw != ev->width);
 579		sw = ev->width;
 580		sh = ev->height;
 581		if(updategeom() || dirty) {
 582			if(dc.drawable != 0)
 583				XFreePixmap(dpy, dc.drawable);
 584			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 585			updatebars();
 586			for(m = mons; m; m = m->next)
 587				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 588			focus(NULL);
 589			arrange(NULL);
 590		}
 591	}
 592}
 593
 594void
 595configurerequest(XEvent *e) {
 596	Client *c;
 597	Monitor *m;
 598	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 599	XWindowChanges wc;
 600
 601	if((c = wintoclient(ev->window))) {
 602		if(ev->value_mask & CWBorderWidth)
 603			c->bw = ev->border_width;
 604		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 605			m = c->mon;
 606			if(ev->value_mask & CWX) {
 607				c->oldx = c->x;
 608				c->x = m->mx + ev->x;
 609			}
 610			if(ev->value_mask & CWY) {
 611				c->oldy = c->y;
 612				c->y = m->my + ev->y;
 613			}
 614			if(ev->value_mask & CWWidth) {
 615				c->oldw = c->w;
 616				c->w = ev->width;
 617			}
 618			if(ev->value_mask & CWHeight) {
 619				c->oldh = c->h;
 620				c->h = ev->height;
 621			}
 622			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 623				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 624			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 625				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 626			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 627				configure(c);
 628			if(ISVISIBLE(c))
 629				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 630		}
 631		else
 632			configure(c);
 633	}
 634	else {
 635		wc.x = ev->x;
 636		wc.y = ev->y;
 637		wc.width = ev->width;
 638		wc.height = ev->height;
 639		wc.border_width = ev->border_width;
 640		wc.sibling = ev->above;
 641		wc.stack_mode = ev->detail;
 642		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 643	}
 644	XSync(dpy, False);
 645}
 646
 647Monitor *
 648createmon(void) {
 649	Monitor *m;
 650
 651	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 652		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 653	m->tagset[0] = m->tagset[1] = 1;
 654	m->mfact = mfact;
 655	m->nmaster = nmaster;
 656	m->showbar = showbar;
 657	m->topbar = topbar;
 658	m->lt[0] = &layouts[0];
 659	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 660	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 661	return m;
 662}
 663
 664void
 665destroynotify(XEvent *e) {
 666	Client *c;
 667	XDestroyWindowEvent *ev = &e->xdestroywindow;
 668
 669	if((c = wintoclient(ev->window)))
 670		unmanage(c, True);
 671}
 672
 673void
 674detach(Client *c) {
 675	Client **tc;
 676
 677	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 678	*tc = c->next;
 679}
 680
 681void
 682detachstack(Client *c) {
 683	Client **tc, *t;
 684
 685	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 686	*tc = c->snext;
 687
 688	if(c == c->mon->sel) {
 689		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 690		c->mon->sel = t;
 691	}
 692}
 693
 694void
 695die(const char *errstr, ...) {
 696	va_list ap;
 697
 698	va_start(ap, errstr);
 699	vfprintf(stderr, errstr, ap);
 700	va_end(ap);
 701	exit(EXIT_FAILURE);
 702}
 703
 704Monitor *
 705dirtomon(int dir) {
 706	Monitor *m = NULL;
 707
 708	if(dir > 0) {
 709		if(!(m = selmon->next))
 710			m = mons;
 711	}
 712	else if(selmon == mons)
 713		for(m = mons; m->next; m = m->next);
 714	else
 715		for(m = mons; m->next != selmon; m = m->next);
 716	return m;
 717}
 718
 719void
 720drawbar(Monitor *m) {
 721	int x;
 722	unsigned int i, occ = 0, urg = 0;
 723	unsigned long *col;
 724	Client *c;
 725
 726	for(c = m->clients; c; c = c->next) {
 727		occ |= c->tags;
 728		if(c->isurgent)
 729			urg |= c->tags;
 730	}
 731	dc.x = 0;
 732	for(i = 0; i < LENGTH(tags); i++) {
 733		dc.w = TEXTW(tags[i]);
 734		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 735		drawtext(tags[i], col, urg & 1 << i);
 736		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 737		           occ & 1 << i, urg & 1 << i, col);
 738		dc.x += dc.w;
 739	}
 740	dc.w = blw = TEXTW(m->ltsymbol);
 741	drawtext(m->ltsymbol, dc.norm, False);
 742	dc.x += dc.w;
 743	x = dc.x;
 744	if(m == selmon) { /* status is only drawn on selected monitor */
 745		dc.w = TEXTW(stext);
 746		dc.x = m->ww - dc.w;
 747		if(dc.x < x) {
 748			dc.x = x;
 749			dc.w = m->ww - x;
 750		}
 751		drawtext(stext, dc.norm, False);
 752	}
 753	else
 754		dc.x = m->ww;
 755	if((dc.w = dc.x - x) > bh) {
 756		dc.x = x;
 757		if(m->sel) {
 758			col = m == selmon ? dc.sel : dc.norm;
 759			drawtext(m->sel->name, col, False);
 760			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 761		}
 762		else
 763			drawtext(NULL, dc.norm, False);
 764	}
 765	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 766	XSync(dpy, False);
 767}
 768
 769void
 770drawbars(void) {
 771	Monitor *m;
 772
 773	for(m = mons; m; m = m->next)
 774		drawbar(m);
 775}
 776
 777void
 778drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 779	int x;
 780
 781	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 782	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 783	if(filled)
 784		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 785	else if(empty)
 786		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 787}
 788
 789void
 790drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 791	char buf[256];
 792	int i, x, y, h, len, olen;
 793
 794	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 795	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 796	if(!text)
 797		return;
 798	olen = strlen(text);
 799	h = dc.font.ascent + dc.font.descent;
 800	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 801	x = dc.x + (h / 2);
 802	/* shorten text if necessary */
 803	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 804	if(!len)
 805		return;
 806	memcpy(buf, text, len);
 807	if(len < olen)
 808		for(i = len; i && i > len - 3; buf[--i] = '.');
 809	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 810	if(dc.font.set)
 811		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 812	else
 813		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 814}
 815
 816void
 817enternotify(XEvent *e) {
 818	Client *c;
 819	Monitor *m;
 820	XCrossingEvent *ev = &e->xcrossing;
 821
 822	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 823		return;
 824	c = wintoclient(ev->window);
 825	m = c ? c->mon : wintomon(ev->window);
 826	if(m != selmon) {
 827		unfocus(selmon->sel, True);
 828		selmon = m;
 829	}
 830	else if(!c || c == selmon->sel)
 831		return;
 832	focus(c);
 833}
 834
 835void
 836expose(XEvent *e) {
 837	Monitor *m;
 838	XExposeEvent *ev = &e->xexpose;
 839
 840	if(ev->count == 0 && (m = wintomon(ev->window)))
 841		drawbar(m);
 842}
 843
 844void
 845focus(Client *c) {
 846	if(!c || !ISVISIBLE(c))
 847		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 848	/* was if(selmon->sel) */
 849	if(selmon->sel && selmon->sel != c)
 850		unfocus(selmon->sel, False);
 851	if(c) {
 852		if(c->mon != selmon)
 853			selmon = c->mon;
 854		if(c->isurgent)
 855			clearurgent(c);
 856		detachstack(c);
 857		attachstack(c);
 858		grabbuttons(c, True);
 859		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 860		setfocus(c);
 861	}
 862	else {
 863		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 864		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 865	}
 866	selmon->sel = c;
 867	drawbars();
 868}
 869
 870void
 871focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 872	XFocusChangeEvent *ev = &e->xfocus;
 873
 874	if(selmon->sel && ev->window != selmon->sel->win)
 875		setfocus(selmon->sel);
 876}
 877
 878void
 879focusmon(const Arg *arg) {
 880	Monitor *m;
 881
 882	if(!mons->next)
 883		return;
 884	if((m = dirtomon(arg->i)) == selmon)
 885		return;
 886	unfocus(selmon->sel, True);
 887	selmon = m;
 888	focus(NULL);
 889}
 890
 891void
 892focusstack(const Arg *arg) {
 893	Client *c = NULL, *i;
 894
 895	if(!selmon->sel)
 896		return;
 897	if(arg->i > 0) {
 898		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 899		if(!c)
 900			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 901	}
 902	else {
 903		for(i = selmon->clients; i != selmon->sel; i = i->next)
 904			if(ISVISIBLE(i))
 905				c = i;
 906		if(!c)
 907			for(; i; i = i->next)
 908				if(ISVISIBLE(i))
 909					c = i;
 910	}
 911	if(c) {
 912		focus(c);
 913		restack(selmon);
 914	}
 915}
 916
 917Atom
 918getatomprop(Client *c, Atom prop) {
 919	int di;
 920	unsigned long dl;
 921	unsigned char *p = NULL;
 922	Atom da, atom = None;
 923
 924	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 925	                      &da, &di, &dl, &dl, &p) == Success && p) {
 926		atom = *(Atom *)p;
 927		XFree(p);
 928	}
 929	return atom;
 930}
 931
 932unsigned long
 933getcolor(const char *colstr) {
 934	Colormap cmap = DefaultColormap(dpy, screen);
 935	XColor color;
 936
 937	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 938		die("error, cannot allocate color '%s'\n", colstr);
 939	return color.pixel;
 940}
 941
 942Bool
 943getrootptr(int *x, int *y) {
 944	int di;
 945	unsigned int dui;
 946	Window dummy;
 947
 948	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 949}
 950
 951long
 952getstate(Window w) {
 953	int format;
 954	long result = -1;
 955	unsigned char *p = NULL;
 956	unsigned long n, extra;
 957	Atom real;
 958
 959	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 960	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 961		return -1;
 962	if(n != 0)
 963		result = *p;
 964	XFree(p);
 965	return result;
 966}
 967
 968Bool
 969gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 970	char **list = NULL;
 971	int n;
 972	XTextProperty name;
 973
 974	if(!text || size == 0)
 975		return False;
 976	text[0] = '\0';
 977	XGetTextProperty(dpy, w, &name, atom);
 978	if(!name.nitems)
 979		return False;
 980	if(name.encoding == XA_STRING)
 981		strncpy(text, (char *)name.value, size - 1);
 982	else {
 983		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 984			strncpy(text, *list, size - 1);
 985			XFreeStringList(list);
 986		}
 987	}
 988	text[size - 1] = '\0';
 989	XFree(name.value);
 990	return True;
 991}
 992
 993void
 994grabbuttons(Client *c, Bool focused) {
 995	updatenumlockmask();
 996	{
 997		unsigned int i, j;
 998		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 999		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1000		if(focused) {
1001			for(i = 0; i < LENGTH(buttons); i++)
1002				if(buttons[i].click == ClkClientWin)
1003					for(j = 0; j < LENGTH(modifiers); j++)
1004						XGrabButton(dpy, buttons[i].button,
1005						            buttons[i].mask | modifiers[j],
1006						            c->win, False, BUTTONMASK,
1007						            GrabModeAsync, GrabModeSync, None, None);
1008		}
1009		else
1010			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1011			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1012	}
1013}
1014
1015void
1016grabkeys(void) {
1017	updatenumlockmask();
1018	{
1019		unsigned int i, j;
1020		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1021		KeyCode code;
1022
1023		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1024		for(i = 0; i < LENGTH(keys); i++)
1025			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1026				for(j = 0; j < LENGTH(modifiers); j++)
1027					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1028						 True, GrabModeAsync, GrabModeAsync);
1029	}
1030}
1031
1032void
1033incnmaster(const Arg *arg) {
1034	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1035	arrange(selmon);
1036}
1037
1038void
1039initfont(const char *fontstr) {
1040	char *def, **missing;
1041	int n;
1042
1043	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1044	if(missing) {
1045		while(n--)
1046			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1047		XFreeStringList(missing);
1048	}
1049	if(dc.font.set) {
1050		XFontStruct **xfonts;
1051		char **font_names;
1052
1053		dc.font.ascent = dc.font.descent = 0;
1054		XExtentsOfFontSet(dc.font.set);
1055		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1056		while(n--) {
1057			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1058			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1059			xfonts++;
1060		}
1061	}
1062	else {
1063		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1064		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1065			die("error, cannot load font: '%s'\n", fontstr);
1066		dc.font.ascent = dc.font.xfont->ascent;
1067		dc.font.descent = dc.font.xfont->descent;
1068	}
1069	dc.font.height = dc.font.ascent + dc.font.descent;
1070}
1071
1072#ifdef XINERAMA
1073static Bool
1074isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1075	while(n--)
1076		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1077		&& unique[n].width == info->width && unique[n].height == info->height)
1078			return False;
1079	return True;
1080}
1081#endif /* XINERAMA */
1082
1083void
1084keypress(XEvent *e) {
1085	unsigned int i;
1086	KeySym keysym;
1087	XKeyEvent *ev;
1088
1089	ev = &e->xkey;
1090	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1091	for(i = 0; i < LENGTH(keys); i++)
1092		if(keysym == keys[i].keysym
1093		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1094		&& keys[i].func)
1095			keys[i].func(&(keys[i].arg));
1096}
1097
1098void
1099killclient(const Arg *arg) {
1100	if(!selmon->sel)
1101		return;
1102	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1103		XGrabServer(dpy);
1104		XSetErrorHandler(xerrordummy);
1105		XSetCloseDownMode(dpy, DestroyAll);
1106		XKillClient(dpy, selmon->sel->win);
1107		XSync(dpy, False);
1108		XSetErrorHandler(xerror);
1109		XUngrabServer(dpy);
1110	}
1111}
1112
1113void
1114manage(Window w, XWindowAttributes *wa) {
1115	Client *c, *t = NULL;
1116	Window trans = None;
1117	XWindowChanges wc;
1118
1119	if(!(c = calloc(1, sizeof(Client))))
1120		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1121	c->win = w;
1122	updatetitle(c);
1123	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1124		c->mon = t->mon;
1125		c->tags = t->tags;
1126	}
1127	else {
1128		c->mon = selmon;
1129		applyrules(c);
1130	}
1131	/* geometry */
1132	c->x = c->oldx = wa->x;
1133	c->y = c->oldy = wa->y;
1134	c->w = c->oldw = wa->width;
1135	c->h = c->oldh = wa->height;
1136	c->oldbw = wa->border_width;
1137
1138	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1139		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1140	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1141		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1142	c->x = MAX(c->x, c->mon->mx);
1143	/* only fix client y-offset, if the client center might cover the bar */
1144	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1145	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1146	c->bw = borderpx;
1147
1148	wc.border_width = c->bw;
1149	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1150	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1151	configure(c); /* propagates border_width, if size doesn't change */
1152	updatewindowtype(c);
1153	updatesizehints(c);
1154	updatewmhints(c);
1155	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1156	grabbuttons(c, False);
1157	if(!c->isfloating)
1158		c->isfloating = c->oldstate = trans != None || c->isfixed;
1159	if(c->isfloating)
1160		XRaiseWindow(dpy, c->win);
1161	attach(c);
1162	attachstack(c);
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	restack(selmon);
1235	ocx = c->x;
1236	ocy = c->y;
1237	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1238	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1239		return;
1240	if(!getrootptr(&x, &y))
1241		return;
1242	do {
1243		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1244		switch(ev.type) {
1245		case ConfigureRequest:
1246		case Expose:
1247		case MapRequest:
1248			handler[ev.type](&ev);
1249			break;
1250		case MotionNotify:
1251			nx = ocx + (ev.xmotion.x - x);
1252			ny = ocy + (ev.xmotion.y - y);
1253			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1254			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1255				if(abs(selmon->wx - nx) < snap)
1256					nx = selmon->wx;
1257				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1258					nx = selmon->wx + selmon->ww - WIDTH(c);
1259				if(abs(selmon->wy - ny) < snap)
1260					ny = selmon->wy;
1261				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1262					ny = selmon->wy + selmon->wh - HEIGHT(c);
1263				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1264				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1265					togglefloating(NULL);
1266			}
1267			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating) {
1268				if(c->isfullscreen)
1269					setfullscreen(c, False);
1270				resize(c, nx, ny, c->w, c->h, True);
1271			}
1272			break;
1273		}
1274	} while(ev.type != ButtonRelease);
1275	XUngrabPointer(dpy, CurrentTime);
1276	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1277		sendmon(c, m);
1278		selmon = m;
1279		focus(NULL);
1280	}
1281}
1282
1283Client *
1284nexttiled(Client *c) {
1285	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1286	return c;
1287}
1288
1289void
1290pop(Client *c) {
1291	detach(c);
1292	attach(c);
1293	focus(c);
1294	arrange(c->mon);
1295}
1296
1297void
1298propertynotify(XEvent *e) {
1299	Client *c;
1300	Window trans;
1301	XPropertyEvent *ev = &e->xproperty;
1302
1303	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1304		updatestatus();
1305	else if(ev->state == PropertyDelete)
1306		return; /* ignore */
1307	else if((c = wintoclient(ev->window))) {
1308		switch(ev->atom) {
1309		default: break;
1310		case XA_WM_TRANSIENT_FOR:
1311			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1312			   (c->isfloating = (wintoclient(trans)) != NULL))
1313				arrange(c->mon);
1314			break;
1315		case XA_WM_NORMAL_HINTS:
1316			updatesizehints(c);
1317			break;
1318		case XA_WM_HINTS:
1319			updatewmhints(c);
1320			drawbars();
1321			break;
1322		}
1323		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1324			updatetitle(c);
1325			if(c == c->mon->sel)
1326				drawbar(c->mon);
1327		}
1328		if(ev->atom == netatom[NetWMWindowType])
1329			updatewindowtype(c);
1330	}
1331}
1332
1333void
1334quit(const Arg *arg) {
1335	running = False;
1336}
1337
1338Monitor *
1339recttomon(int x, int y, int w, int h) {
1340	Monitor *m, *r = selmon;
1341	int a, area = 0;
1342
1343	for(m = mons; m; m = m->next)
1344		if((a = INTERSECT(x, y, w, h, m)) > area) {
1345			area = a;
1346			r = m;
1347		}
1348	return r;
1349}
1350
1351void
1352resize(Client *c, int x, int y, int w, int h, Bool interact) {
1353	if(applysizehints(c, &x, &y, &w, &h, interact))
1354		resizeclient(c, x, y, w, h);
1355}
1356
1357void
1358resizeclient(Client *c, int x, int y, int w, int h) {
1359	XWindowChanges wc;
1360
1361	c->oldx = c->x; c->x = wc.x = x;
1362	c->oldy = c->y; c->y = wc.y = y;
1363	c->oldw = c->w; c->w = wc.width = w;
1364	c->oldh = c->h; c->h = wc.height = h;
1365	wc.border_width = c->bw;
1366	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1367	configure(c);
1368	XSync(dpy, False);
1369}
1370
1371void
1372resizemouse(const Arg *arg) {
1373	int ocx, ocy;
1374	int nw, nh;
1375	Client *c;
1376	Monitor *m;
1377	XEvent ev;
1378
1379	if(!(c = selmon->sel))
1380		return;
1381	restack(selmon);
1382	ocx = c->x;
1383	ocy = c->y;
1384	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1385	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1386		return;
1387	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1388	do {
1389		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1390		switch(ev.type) {
1391		case ConfigureRequest:
1392		case Expose:
1393		case MapRequest:
1394			handler[ev.type](&ev);
1395			break;
1396		case MotionNotify:
1397			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1398			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1399			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1400			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1401			{
1402				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1403				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1404					togglefloating(NULL);
1405			}
1406			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating) {
1407				if(c->isfullscreen)
1408					setfullscreen(c, False);
1409				resize(c, c->x, c->y, nw, nh, True);
1410			}
1411			break;
1412		}
1413	} while(ev.type != ButtonRelease);
1414	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1415	XUngrabPointer(dpy, CurrentTime);
1416	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1417	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1418		sendmon(c, m);
1419		selmon = m;
1420		focus(NULL);
1421	}
1422}
1423
1424void
1425restack(Monitor *m) {
1426	Client *c;
1427	XEvent ev;
1428	XWindowChanges wc;
1429
1430	drawbar(m);
1431	if(!m->sel)
1432		return;
1433	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1434		XRaiseWindow(dpy, m->sel->win);
1435	if(m->lt[m->sellt]->arrange) {
1436		wc.stack_mode = Below;
1437		wc.sibling = m->barwin;
1438		for(c = m->stack; c; c = c->snext)
1439			if(!c->isfloating && ISVISIBLE(c)) {
1440				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1441				wc.sibling = c->win;
1442			}
1443	}
1444	XSync(dpy, False);
1445	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1446}
1447
1448void
1449run(void) {
1450	XEvent ev;
1451	/* main event loop */
1452	XSync(dpy, False);
1453	while(running && !XNextEvent(dpy, &ev))
1454		if(handler[ev.type])
1455			handler[ev.type](&ev); /* call handler */
1456}
1457
1458void
1459scan(void) {
1460	unsigned int i, num;
1461	Window d1, d2, *wins = NULL;
1462	XWindowAttributes wa;
1463
1464	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1465		for(i = 0; i < num; i++) {
1466			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1467			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1468				continue;
1469			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1470				manage(wins[i], &wa);
1471		}
1472		for(i = 0; i < num; i++) { /* now the transients */
1473			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1474				continue;
1475			if(XGetTransientForHint(dpy, wins[i], &d1)
1476			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1477				manage(wins[i], &wa);
1478		}
1479		if(wins)
1480			XFree(wins);
1481	}
1482}
1483
1484void
1485sendmon(Client *c, Monitor *m) {
1486	if(c->mon == m)
1487		return;
1488	unfocus(c, True);
1489	detach(c);
1490	detachstack(c);
1491	c->mon = m;
1492	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1493	attach(c);
1494	attachstack(c);
1495	focus(NULL);
1496	arrange(NULL);
1497}
1498
1499void
1500setclientstate(Client *c, long state) {
1501	long data[] = { state, None };
1502
1503	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1504			PropModeReplace, (unsigned char *)data, 2);
1505}
1506
1507Bool
1508sendevent(Client *c, Atom proto) {
1509	int n;
1510	Atom *protocols;
1511	Bool exists = False;
1512	XEvent ev;
1513
1514	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1515		while(!exists && n--)
1516			exists = protocols[n] == proto;
1517		XFree(protocols);
1518	}
1519	if(exists) {
1520		ev.type = ClientMessage;
1521		ev.xclient.window = c->win;
1522		ev.xclient.message_type = wmatom[WMProtocols];
1523		ev.xclient.format = 32;
1524		ev.xclient.data.l[0] = proto;
1525		ev.xclient.data.l[1] = CurrentTime;
1526		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1527	}
1528	return exists;
1529}
1530
1531void
1532setfocus(Client *c) {
1533	if(!c->neverfocus) {
1534		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1535		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1536 		                XA_WINDOW, 32, PropModeReplace,
1537 		                (unsigned char *) &(c->win), 1);
1538	}
1539	sendevent(c, wmatom[WMTakeFocus]);
1540}
1541
1542void
1543setfullscreen(Client *c, Bool fullscreen) {
1544	if(fullscreen) {
1545		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1546		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1547		c->isfullscreen = True;
1548		c->oldstate = c->isfloating;
1549		c->oldbw = c->bw;
1550		c->bw = 0;
1551		c->isfloating = True;
1552		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1553		XRaiseWindow(dpy, c->win);
1554	}
1555	else {
1556		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1557		                PropModeReplace, (unsigned char*)0, 0);
1558		c->isfullscreen = False;
1559		c->isfloating = c->oldstate;
1560		c->bw = c->oldbw;
1561		c->x = c->oldx;
1562		c->y = c->oldy;
1563		c->w = c->oldw;
1564		c->h = c->oldh;
1565		resizeclient(c, c->x, c->y, c->w, c->h);
1566		arrange(c->mon);
1567	}
1568}
1569
1570void
1571setlayout(const Arg *arg) {
1572	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1573		selmon->sellt ^= 1;
1574	if(arg && arg->v)
1575		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1576	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1577	if(selmon->sel)
1578		arrange(selmon);
1579	else
1580		drawbar(selmon);
1581}
1582
1583/* arg > 1.0 will set mfact absolutly */
1584void
1585setmfact(const Arg *arg) {
1586	float f;
1587
1588	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1589		return;
1590	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1591	if(f < 0.1 || f > 0.9)
1592		return;
1593	selmon->mfact = f;
1594	arrange(selmon);
1595}
1596
1597void
1598setup(void) {
1599	XSetWindowAttributes wa;
1600
1601	/* clean up any zombies immediately */
1602	sigchld(0);
1603
1604	/* init screen */
1605	screen = DefaultScreen(dpy);
1606	root = RootWindow(dpy, screen);
1607	initfont(font);
1608	sw = DisplayWidth(dpy, screen);
1609	sh = DisplayHeight(dpy, screen);
1610	bh = dc.h = dc.font.height + 2;
1611	updategeom();
1612	/* init atoms */
1613	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1614	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1615	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1616	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1617	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1618	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1619	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1620	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1621	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1622	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1623	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1624	/* init cursors */
1625	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1626	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1627	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1628	/* init appearance */
1629	dc.norm[ColBorder] = getcolor(normbordercolor);
1630	dc.norm[ColBG] = getcolor(normbgcolor);
1631	dc.norm[ColFG] = getcolor(normfgcolor);
1632	dc.sel[ColBorder] = getcolor(selbordercolor);
1633	dc.sel[ColBG] = getcolor(selbgcolor);
1634	dc.sel[ColFG] = getcolor(selfgcolor);
1635	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1636	dc.gc = XCreateGC(dpy, root, 0, NULL);
1637	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1638	if(!dc.font.set)
1639		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1640	/* init bars */
1641	updatebars();
1642	updatestatus();
1643	/* EWMH support per view */
1644	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1645			PropModeReplace, (unsigned char *) netatom, NetLast);
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	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1757	if(selmon->sel->isfloating)
1758		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1759		       selmon->sel->w, selmon->sel->h, False);
1760	else if(selmon->sel->isfullscreen)
1761		setfullscreen(selmon->sel, 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	arrange(m);
1824}
1825
1826void
1827unmapnotify(XEvent *e) {
1828	Client *c;
1829	XUnmapEvent *ev = &e->xunmap;
1830
1831	if((c = wintoclient(ev->window))) {
1832		if(ev->send_event)
1833			setclientstate(c, WithdrawnState);
1834		else
1835			unmanage(c, False);
1836	}
1837}
1838
1839void
1840updatebars(void) {
1841	Monitor *m;
1842	XSetWindowAttributes wa = {
1843		.override_redirect = True,
1844		.background_pixmap = ParentRelative,
1845		.event_mask = ButtonPressMask|ExposureMask
1846	};
1847	for(m = mons; m; m = m->next) {
1848		if (m->barwin)
1849			continue;
1850		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1851		                          CopyFromParent, DefaultVisual(dpy, screen),
1852		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1853		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1854		XMapRaised(dpy, m->barwin);
1855	}
1856}
1857
1858void
1859updatebarpos(Monitor *m) {
1860	m->wy = m->my;
1861	m->wh = m->mh;
1862	if(m->showbar) {
1863		m->wh -= bh;
1864		m->by = m->topbar ? m->wy : m->wy + m->wh;
1865		m->wy = m->topbar ? m->wy + bh : m->wy;
1866	}
1867	else
1868		m->by = -bh;
1869}
1870
1871Bool
1872updategeom(void) {
1873	Bool dirty = False;
1874
1875#ifdef XINERAMA
1876	if(XineramaIsActive(dpy)) {
1877		int i, j, n, nn;
1878		Client *c;
1879		Monitor *m;
1880		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1881		XineramaScreenInfo *unique = NULL;
1882
1883		for(n = 0, m = mons; m; m = m->next, n++);
1884		/* only consider unique geometries as separate screens */
1885		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1886			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1887		for(i = 0, j = 0; i < nn; i++)
1888			if(isuniquegeom(unique, j, &info[i]))
1889				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1890		XFree(info);
1891		nn = j;
1892		if(n <= nn) {
1893			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1894				for(m = mons; m && m->next; m = m->next);
1895				if(m)
1896					m->next = createmon();
1897				else
1898					mons = createmon();
1899			}
1900			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1901				if(i >= n
1902				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1903				    || unique[i].width != m->mw || unique[i].height != m->mh))
1904				{
1905					dirty = True;
1906					m->num = i;
1907					m->mx = m->wx = unique[i].x_org;
1908					m->my = m->wy = unique[i].y_org;
1909					m->mw = m->ww = unique[i].width;
1910					m->mh = m->wh = unique[i].height;
1911					updatebarpos(m);
1912				}
1913		}
1914		else { /* less monitors available nn < n */
1915			for(i = nn; i < n; i++) {
1916				for(m = mons; m && m->next; m = m->next);
1917				while(m->clients) {
1918					dirty = True;
1919					c = m->clients;
1920					m->clients = c->next;
1921					detachstack(c);
1922					c->mon = mons;
1923					attach(c);
1924					attachstack(c);
1925				}
1926				if(m == selmon)
1927					selmon = mons;
1928				cleanupmon(m);
1929			}
1930		}
1931		free(unique);
1932	}
1933	else
1934#endif /* XINERAMA */
1935	/* default monitor setup */
1936	{
1937		if(!mons)
1938			mons = createmon();
1939		if(mons->mw != sw || mons->mh != sh) {
1940			dirty = True;
1941			mons->mw = mons->ww = sw;
1942			mons->mh = mons->wh = sh;
1943			updatebarpos(mons);
1944		}
1945	}
1946	if(dirty) {
1947		selmon = mons;
1948		selmon = wintomon(root);
1949	}
1950	return dirty;
1951}
1952
1953void
1954updatenumlockmask(void) {
1955	unsigned int i, j;
1956	XModifierKeymap *modmap;
1957
1958	numlockmask = 0;
1959	modmap = XGetModifierMapping(dpy);
1960	for(i = 0; i < 8; i++)
1961		for(j = 0; j < modmap->max_keypermod; j++)
1962			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1963			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1964				numlockmask = (1 << i);
1965	XFreeModifiermap(modmap);
1966}
1967
1968void
1969updatesizehints(Client *c) {
1970	long msize;
1971	XSizeHints size;
1972
1973	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1974		/* size is uninitialized, ensure that size.flags aren't used */
1975		size.flags = PSize;
1976	if(size.flags & PBaseSize) {
1977		c->basew = size.base_width;
1978		c->baseh = size.base_height;
1979	}
1980	else if(size.flags & PMinSize) {
1981		c->basew = size.min_width;
1982		c->baseh = size.min_height;
1983	}
1984	else
1985		c->basew = c->baseh = 0;
1986	if(size.flags & PResizeInc) {
1987		c->incw = size.width_inc;
1988		c->inch = size.height_inc;
1989	}
1990	else
1991		c->incw = c->inch = 0;
1992	if(size.flags & PMaxSize) {
1993		c->maxw = size.max_width;
1994		c->maxh = size.max_height;
1995	}
1996	else
1997		c->maxw = c->maxh = 0;
1998	if(size.flags & PMinSize) {
1999		c->minw = size.min_width;
2000		c->minh = size.min_height;
2001	}
2002	else if(size.flags & PBaseSize) {
2003		c->minw = size.base_width;
2004		c->minh = size.base_height;
2005	}
2006	else
2007		c->minw = c->minh = 0;
2008	if(size.flags & PAspect) {
2009		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2010		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2011	}
2012	else
2013		c->maxa = c->mina = 0.0;
2014	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2015	             && c->maxw == c->minw && c->maxh == c->minh);
2016}
2017
2018void
2019updatetitle(Client *c) {
2020	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2021		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2022	if(c->name[0] == '\0') /* hack to mark broken clients */
2023		strcpy(c->name, broken);
2024}
2025
2026void
2027updatestatus(void) {
2028	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2029		strcpy(stext, "dwm-"VERSION);
2030	drawbar(selmon);
2031}
2032
2033void
2034updatewindowtype(Client *c) {
2035	Atom state = getatomprop(c, netatom[NetWMState]);
2036	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2037
2038	if(state == netatom[NetWMFullscreen])
2039		setfullscreen(c, True);
2040	if(wtype == netatom[NetWMWindowTypeDialog])
2041		c->isfloating = True;
2042}
2043
2044void
2045updatewmhints(Client *c) {
2046	XWMHints *wmh;
2047
2048	if((wmh = XGetWMHints(dpy, c->win))) {
2049		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2050			wmh->flags &= ~XUrgencyHint;
2051			XSetWMHints(dpy, c->win, wmh);
2052		}
2053		else
2054			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2055		if(wmh->flags & InputHint)
2056			c->neverfocus = !wmh->input;
2057		else
2058			c->neverfocus = False;
2059		XFree(wmh);
2060	}
2061}
2062
2063void
2064view(const Arg *arg) {
2065	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2066		return;
2067	selmon->seltags ^= 1; /* toggle sel tagset */
2068	if(arg->ui & TAGMASK)
2069		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2070	focus(NULL);
2071	arrange(selmon);
2072}
2073
2074Client *
2075wintoclient(Window w) {
2076	Client *c;
2077	Monitor *m;
2078
2079	for(m = mons; m; m = m->next)
2080		for(c = m->clients; c; c = c->next)
2081			if(c->win == w)
2082				return c;
2083	return NULL;
2084}
2085
2086Monitor *
2087wintomon(Window w) {
2088	int x, y;
2089	Client *c;
2090	Monitor *m;
2091
2092	if(w == root && getrootptr(&x, &y))
2093		return recttomon(x, y, 1, 1);
2094	for(m = mons; m; m = m->next)
2095		if(w == m->barwin)
2096			return m;
2097	if((c = wintoclient(w)))
2098		return c->mon;
2099	return selmon;
2100}
2101
2102/* There's no way to check accesses to destroyed windows, thus those cases are
2103 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2104 * default error handler, which may call exit.  */
2105int
2106xerror(Display *dpy, XErrorEvent *ee) {
2107	if(ee->error_code == BadWindow
2108	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2109	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2110	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2111	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2112	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2113	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2114	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2115	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2116		return 0;
2117	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2118			ee->request_code, ee->error_code);
2119	return xerrorxlib(dpy, ee); /* may call exit */
2120}
2121
2122int
2123xerrordummy(Display *dpy, XErrorEvent *ee) {
2124	return 0;
2125}
2126
2127/* Startup Error handler to check if another window manager
2128 * is already running. */
2129int
2130xerrorstart(Display *dpy, XErrorEvent *ee) {
2131	die("dwm: another window manager is already running\n");
2132	return -1;
2133}
2134
2135void
2136zoom(const Arg *arg) {
2137	Client *c = selmon->sel;
2138
2139	if(!selmon->lt[selmon->sellt]->arrange
2140	|| (selmon->sel && selmon->sel->isfloating))
2141		return;
2142	if(c == nexttiled(selmon->clients))
2143		if(!c || !(c = nexttiled(c->next)))
2144			return;
2145	pop(c);
2146}
2147
2148int
2149main(int argc, char *argv[]) {
2150	if(argc == 2 && !strcmp("-v", argv[1]))
2151		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2152	else if(argc != 1)
2153		die("usage: dwm [-v]\n");
2154	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2155		fputs("warning: no locale support\n", stderr);
2156	if(!(dpy = XOpenDisplay(NULL)))
2157		die("dwm: cannot open display\n");
2158	checkotherwm();
2159	setup();
2160	scan();
2161	run();
2162	cleanup();
2163	XCloseDisplay(dpy);
2164	return EXIT_SUCCESS;
2165}