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