1/* See LICENSE file for copyright and license details.
   2 *
   3 * dynamic window manager is designed like any other X client as well. It is
   4 * driven through handling X events. In contrast to other X clients, a window
   5 * manager selects for SubstructureRedirectMask on the root window, to receive
   6 * events about window (dis-)appearance.  Only one X connection at a time is
   7 * allowed to select for this event mask.
   8 *
   9 * The event handlers of dwm are organized in an array which is accessed
  10 * whenever a new event has been fetched. This allows event dispatching
  11 * in O(1) time.
  12 *
  13 * Each child of the root window is called a client, except windows which have
  14 * set the override_redirect flag.  Clients are organized in a linked client
  15 * list on each monitor, the focus history is remembered through a stack list
  16 * on each monitor. Each client contains a bit array to indicate the tags of a
  17 * client.
  18 *
  19 * Keys and tagging rules are organized as arrays and defined in config.h.
  20 *
  21 * To understand everything else, start reading main().
  22 */
  23#include <errno.h>
  24#include <locale.h>
  25#include <stdarg.h>
  26#include <signal.h>
  27#include <stdio.h>
  28#include <stdlib.h>
  29#include <string.h>
  30#include <unistd.h>
  31#include <sys/types.h>
  32#include <sys/wait.h>
  33#include <X11/cursorfont.h>
  34#include <X11/keysym.h>
  35#include <X11/Xatom.h>
  36#include <X11/Xlib.h>
  37#include <X11/Xproto.h>
  38#include <X11/Xutil.h>
  39#include <X11/XKBlib.h>
  40#ifdef XINERAMA
  41#include <X11/extensions/Xinerama.h>
  42#endif /* XINERAMA */
  43
  44/* macros */
  45#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  46#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  47#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  48                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  49#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  50#define LENGTH(X)               (sizeof X / sizeof X[0])
  51#define MAX(A, B)               ((A) > (B) ? (A) : (B))
  52#define MIN(A, B)               ((A) < (B) ? (A) : (B))
  53#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  54#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  55#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  56#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  57#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  58
  59/* enums */
  60enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  61enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  62enum { NetSupported, NetWMName, NetWMState,
  63       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  64       NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  65enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  66enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  67       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  68
  69typedef union {
  70	int i;
  71	unsigned int ui;
  72	float f;
  73	const void *v;
  74} Arg;
  75
  76typedef struct {
  77	unsigned int click;
  78	unsigned int mask;
  79	unsigned int button;
  80	void (*func)(const Arg *arg);
  81	const Arg arg;
  82} Button;
  83
  84typedef struct Monitor Monitor;
  85typedef struct Client Client;
  86struct Client {
  87	char name[256];
  88	float mina, maxa;
  89	int x, y, w, h;
  90	int oldx, oldy, oldw, oldh;
  91	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  92	int bw, oldbw;
  93	unsigned int tags;
  94	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  95	Client *next;
  96	Client *snext;
  97	Monitor *mon;
  98	Window win;
  99};
 100
 101typedef struct {
 102	int x, y, w, h;
 103	unsigned long norm[ColLast];
 104	unsigned long sel[ColLast];
 105	Drawable drawable;
 106	GC gc;
 107	struct {
 108		int ascent;
 109		int descent;
 110		int height;
 111		XFontSet set;
 112		XFontStruct *xfont;
 113	} font;
 114} DC; /* draw context */
 115
 116typedef struct {
 117	unsigned int mod;
 118	KeySym keysym;
 119	void (*func)(const Arg *);
 120	const Arg arg;
 121} Key;
 122
 123typedef struct {
 124	const char *symbol;
 125	void (*arrange)(Monitor *);
 126} Layout;
 127
 128struct Monitor {
 129	char ltsymbol[16];
 130	float mfact;
 131	int nmaster;
 132	int num;
 133	int by;               /* bar geometry */
 134	int mx, my, mw, mh;   /* screen size */
 135	int wx, wy, ww, wh;   /* window area  */
 136	unsigned int seltags;
 137	unsigned int sellt;
 138	unsigned int tagset[2];
 139	Bool showbar;
 140	Bool topbar;
 141	Client *clients;
 142	Client *sel;
 143	Client *stack;
 144	Monitor *next;
 145	Window barwin;
 146	const Layout *lt[2];
 147};
 148
 149typedef struct {
 150	const char *class;
 151	const char *instance;
 152	const char *title;
 153	unsigned int tags;
 154	Bool isfloating;
 155	int monitor;
 156} Rule;
 157
 158/* function declarations */
 159static void applyrules(Client *c);
 160static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 161static void arrange(Monitor *m);
 162static void arrangemon(Monitor *m);
 163static void attach(Client *c);
 164static void attachstack(Client *c);
 165static void buttonpress(XEvent *e);
 166static void checkotherwm(void);
 167static void cleanup(void);
 168static void cleanupmon(Monitor *mon);
 169static void clearurgent(Client *c);
 170static void clientmessage(XEvent *e);
 171static void configure(Client *c);
 172static void configurenotify(XEvent *e);
 173static void configurerequest(XEvent *e);
 174static Monitor *createmon(void);
 175static void destroynotify(XEvent *e);
 176static void detach(Client *c);
 177static void detachstack(Client *c);
 178static void die(const char *errstr, ...);
 179static Monitor *dirtomon(int dir);
 180static void drawbar(Monitor *m);
 181static void drawbars(void);
 182static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 183static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 184static void enternotify(XEvent *e);
 185static void expose(XEvent *e);
 186static void focus(Client *c);
 187static void focusin(XEvent *e);
 188static void focusmon(const Arg *arg);
 189static void focusstack(const Arg *arg);
 190static unsigned long getcolor(const char *colstr);
 191static Bool getrootptr(int *x, int *y);
 192static long getstate(Window w);
 193static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 194static void grabbuttons(Client *c, Bool focused);
 195static void grabkeys(void);
 196static void incnmaster(const Arg *arg);
 197static void initfont(const char *fontstr);
 198static void keypress(XEvent *e);
 199static void killclient(const Arg *arg);
 200static void manage(Window w, XWindowAttributes *wa);
 201static void mappingnotify(XEvent *e);
 202static void maprequest(XEvent *e);
 203static void monocle(Monitor *m);
 204static void motionnotify(XEvent *e);
 205static void movemouse(const Arg *arg);
 206static Client *nexttiled(Client *c);
 207static void pop(Client *);
 208static void propertynotify(XEvent *e);
 209static void quit(const Arg *arg);
 210static Monitor *recttomon(int x, int y, int w, int h);
 211static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 212static void resizeclient(Client *c, int x, int y, int w, int h);
 213static void resizemouse(const Arg *arg);
 214static void restack(Monitor *m);
 215static void run(void);
 216static void scan(void);
 217static Bool sendevent(Client *c, Atom proto);
 218static void sendmon(Client *c, Monitor *m);
 219static void setclientstate(Client *c, long state);
 220static void setfocus(Client *c);
 221static void setfullscreen(Client *c, Bool fullscreen);
 222static void setlayout(const Arg *arg);
 223static void setmfact(const Arg *arg);
 224static void setup(void);
 225static void showhide(Client *c);
 226static void sigchld(int unused);
 227static void spawn(const Arg *arg);
 228static void tag(const Arg *arg);
 229static void tagmon(const Arg *arg);
 230static int textnw(const char *text, unsigned int len);
 231static void tile(Monitor *);
 232static void togglebar(const Arg *arg);
 233static void togglefloating(const Arg *arg);
 234static void toggletag(const Arg *arg);
 235static void toggleview(const Arg *arg);
 236static void unfocus(Client *c, Bool setfocus);
 237static void unmanage(Client *c, Bool destroyed);
 238static void unmapnotify(XEvent *e);
 239static void updategeom(void);
 240static void updatebarpos(Monitor *m);
 241static void updatebars(void);
 242static void updateclientlist(void);
 243static void updatenumlockmask(void);
 244static void updatesizehints(Client *c);
 245static void updatestatus(void);
 246static void updatewindowtype(Client *c);
 247static void updatetitle(Client *c);
 248static void updatewmhints(Client *c);
 249static void view(const Arg *arg);
 250static Client *wintoclient(Window w);
 251static Monitor *wintomon(Window w);
 252static int xerror(Display *dpy, XErrorEvent *ee);
 253static int xerrordummy(Display *dpy, XErrorEvent *ee);
 254static int xerrorstart(Display *dpy, XErrorEvent *ee);
 255static void zoom(const Arg *arg);
 256
 257/* variables */
 258static const char broken[] = "broken";
 259static char stext[256];
 260static int screen;
 261static int sw, sh;           /* X display screen geometry width, height */
 262static int bh, blw = 0;      /* bar geometry */
 263static int (*xerrorxlib)(Display *, XErrorEvent *);
 264static unsigned int numlockmask = 0;
 265static void (*handler[LASTEvent]) (XEvent *) = {
 266	[ButtonPress] = buttonpress,
 267	[ClientMessage] = clientmessage,
 268	[ConfigureRequest] = configurerequest,
 269	[ConfigureNotify] = configurenotify,
 270	[DestroyNotify] = destroynotify,
 271	[EnterNotify] = enternotify,
 272	[Expose] = expose,
 273	[FocusIn] = focusin,
 274	[KeyPress] = keypress,
 275	[MappingNotify] = mappingnotify,
 276	[MapRequest] = maprequest,
 277	[MotionNotify] = motionnotify,
 278	[PropertyNotify] = propertynotify,
 279	[UnmapNotify] = unmapnotify
 280};
 281static Atom wmatom[WMLast], netatom[NetLast];
 282static Bool running = True;
 283static Cursor cursor[CurLast];
 284static Display *dpy;
 285static DC dc;
 286static Monitor *mons = NULL, *selmon = NULL;
 287static Window root;
 288
 289/* configuration, allows nested code to access above variables */
 290#include "config.h"
 291
 292/* compile-time check if all tags fit into an unsigned int bit array. */
 293struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 294
 295/* function implementations */
 296void
 297applyrules(Client *c) {
 298	const char *class, *instance;
 299	unsigned int i;
 300	const Rule *r;
 301	Monitor *m;
 302	XClassHint ch = { NULL, NULL };
 303
 304	/* rule matching */
 305	c->isfloating = c->tags = 0;
 306	XGetClassHint(dpy, c->win, &ch);
 307	class    = ch.res_class ? ch.res_class : broken;
 308	instance = ch.res_name  ? ch.res_name  : broken;
 309
 310	for(i = 0; i < LENGTH(rules); i++) {
 311		r = &rules[i];
 312		if((!r->title || strstr(c->name, r->title))
 313		&& (!r->class || strstr(class, r->class))
 314		&& (!r->instance || strstr(instance, r->instance)))
 315		{
 316			c->isfloating = r->isfloating;
 317			c->tags |= r->tags;
 318			for(m = mons; m && m->num != r->monitor; m = m->next);
 319			if(m)
 320				c->mon = m;
 321		}
 322	}
 323	if(ch.res_class)
 324		XFree(ch.res_class);
 325	if(ch.res_name)
 326		XFree(ch.res_name);
 327	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 328}
 329
 330Bool
 331applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 332	Bool baseismin;
 333	Monitor *m = c->mon;
 334
 335	/* set minimum possible */
 336	*w = MAX(1, *w);
 337	*h = MAX(1, *h);
 338	if(interact) {
 339		if(*x > sw)
 340			*x = sw - WIDTH(c);
 341		if(*y > sh)
 342			*y = sh - HEIGHT(c);
 343		if(*x + *w + 2 * c->bw < 0)
 344			*x = 0;
 345		if(*y + *h + 2 * c->bw < 0)
 346			*y = 0;
 347	}
 348	else {
 349		if(*x >= m->wx + m->ww)
 350			*x = m->wx + m->ww - WIDTH(c);
 351		if(*y >= m->wy + m->wh)
 352			*y = m->wy + m->wh - HEIGHT(c);
 353		if(*x + *w + 2 * c->bw <= m->wx)
 354			*x = m->wx;
 355		if(*y + *h + 2 * c->bw <= m->wy)
 356			*y = m->wy;
 357	}
 358	if(*h < bh)
 359		*h = bh;
 360	if(*w < bh)
 361		*w = bh;
 362	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 363		/* see last two sentences in ICCCM 4.1.2.3 */
 364		baseismin = c->basew == c->minw && c->baseh == c->minh;
 365		if(!baseismin) { /* temporarily remove base dimensions */
 366			*w -= c->basew;
 367			*h -= c->baseh;
 368		}
 369		/* adjust for aspect limits */
 370		if(c->mina > 0 && c->maxa > 0) {
 371			if(c->maxa < (float)*w / *h)
 372				*w = *h * c->maxa + 0.5;
 373			else if(c->mina < (float)*h / *w)
 374				*h = *w * c->mina + 0.5;
 375		}
 376		if(baseismin) { /* increment calculation requires this */
 377			*w -= c->basew;
 378			*h -= c->baseh;
 379		}
 380		/* adjust for increment value */
 381		if(c->incw)
 382			*w -= *w % c->incw;
 383		if(c->inch)
 384			*h -= *h % c->inch;
 385		/* restore base dimensions */
 386		*w = MAX(*w + c->basew, c->minw);
 387		*h = MAX(*h + c->baseh, c->minh);
 388		if(c->maxw)
 389			*w = MIN(*w, c->maxw);
 390		if(c->maxh)
 391			*h = MIN(*h, c->maxh);
 392	}
 393	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 394}
 395
 396void
 397arrange(Monitor *m) {
 398	if(m)
 399		showhide(m->stack);
 400	else for(m = mons; m; m = m->next)
 401		showhide(m->stack);
 402	if(m) {
 403		arrangemon(m);
 404		restack(m);
 405	} else for(m = mons; m; m = m->next)
 406		arrangemon(m);
 407}
 408
 409void
 410arrangemon(Monitor *m) {
 411	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 412	if(m->lt[m->sellt]->arrange)
 413		m->lt[m->sellt]->arrange(m);
 414}
 415
 416void
 417attach(Client *c) {
 418	c->next = c->mon->clients;
 419	c->mon->clients = c;
 420}
 421
 422void
 423attachstack(Client *c) {
 424	c->snext = c->mon->stack;
 425	c->mon->stack = c;
 426}
 427
 428void
 429buttonpress(XEvent *e) {
 430	unsigned int i, x, click;
 431	Arg arg = {0};
 432	Client *c;
 433	Monitor *m;
 434	XButtonPressedEvent *ev = &e->xbutton;
 435
 436	click = ClkRootWin;
 437	/* focus monitor if necessary */
 438	if((m = wintomon(ev->window)) && m != selmon) {
 439		unfocus(selmon->sel, True);
 440		selmon = m;
 441		focus(NULL);
 442	}
 443	if(ev->window == selmon->barwin) {
 444		i = x = 0;
 445		do
 446			x += TEXTW(tags[i]);
 447		while(ev->x >= x && ++i < LENGTH(tags));
 448		if(i < LENGTH(tags)) {
 449			click = ClkTagBar;
 450			arg.ui = 1 << i;
 451		}
 452		else if(ev->x < x + blw)
 453			click = ClkLtSymbol;
 454		else if(ev->x > selmon->ww - TEXTW(stext))
 455			click = ClkStatusText;
 456		else
 457			click = ClkWinTitle;
 458	}
 459	else if((c = wintoclient(ev->window))) {
 460		focus(c);
 461		click = ClkClientWin;
 462	}
 463	for(i = 0; i < LENGTH(buttons); i++)
 464		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 465		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 466			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 467}
 468
 469void
 470checkotherwm(void) {
 471	xerrorxlib = XSetErrorHandler(xerrorstart);
 472	/* this causes an error if some other window manager is running */
 473	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 474	XSync(dpy, False);
 475	XSetErrorHandler(xerror);
 476	XSync(dpy, False);
 477}
 478
 479void
 480cleanup(void) {
 481	Arg a = {.ui = ~0};
 482	Layout foo = { "", NULL };
 483	Monitor *m;
 484
 485	view(&a);
 486	selmon->lt[selmon->sellt] = &foo;
 487	for(m = mons; m; m = m->next)
 488		while(m->stack)
 489			unmanage(m->stack, False);
 490	if(dc.font.set)
 491		XFreeFontSet(dpy, dc.font.set);
 492	else
 493		XFreeFont(dpy, dc.font.xfont);
 494	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 495	XFreePixmap(dpy, dc.drawable);
 496	XFreeGC(dpy, dc.gc);
 497	XFreeCursor(dpy, cursor[CurNormal]);
 498	XFreeCursor(dpy, cursor[CurResize]);
 499	XFreeCursor(dpy, cursor[CurMove]);
 500	while(mons)
 501		cleanupmon(mons);
 502	XSync(dpy, False);
 503	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 504	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 505}
 506
 507void
 508cleanupmon(Monitor *mon) {
 509	Monitor *m;
 510
 511	if(mon == mons)
 512		mons = mons->next;
 513	else {
 514		for(m = mons; m && m->next != mon; m = m->next);
 515		m->next = mon->next;
 516	}
 517	XUnmapWindow(dpy, mon->barwin);
 518	XDestroyWindow(dpy, mon->barwin);
 519	free(mon);
 520}
 521
 522void
 523clearurgent(Client *c) {
 524	XWMHints *wmh;
 525
 526	c->isurgent = False;
 527	if(!(wmh = XGetWMHints(dpy, c->win)))
 528		return;
 529	wmh->flags &= ~XUrgencyHint;
 530	XSetWMHints(dpy, c->win, wmh);
 531	XFree(wmh);
 532}
 533
 534void
 535clientmessage(XEvent *e) {
 536	XClientMessageEvent *cme = &e->xclient;
 537	Client *c = wintoclient(cme->window);
 538
 539	if(!c)
 540		return;
 541	if(cme->message_type == netatom[NetWMState]) {
 542		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 543			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 544			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 545	}
 546	else if(cme->message_type == netatom[NetActiveWindow]) {
 547		if(!ISVISIBLE(c)) {
 548			c->mon->seltags ^= 1;
 549			c->mon->tagset[c->mon->seltags] = c->tags;
 550		}
 551		pop(c);
 552	}
 553}
 554
 555void
 556configure(Client *c) {
 557	XConfigureEvent ce;
 558
 559	ce.type = ConfigureNotify;
 560	ce.display = dpy;
 561	ce.event = c->win;
 562	ce.window = c->win;
 563	ce.x = c->x;
 564	ce.y = c->y;
 565	ce.width = c->w;
 566	ce.height = c->h;
 567	ce.border_width = c->bw;
 568	ce.above = None;
 569	ce.override_redirect = False;
 570	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 571}
 572
 573void
 574configurenotify(XEvent *e) {
 575	Monitor *m;
 576	XConfigureEvent *ev = &e->xconfigure;
 577
 578	if(ev->window == root) {
 579		sw = ev->width;
 580		sh = ev->height;
 581		if(dc.drawable != 0)
 582			XFreePixmap(dpy, dc.drawable);
 583		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 584		updatebars();
 585		for(m = mons; m; m = m->next)
 586			XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 587		focus(NULL);
 588		arrange(NULL);
 589	}
 590}
 591
 592void
 593configurerequest(XEvent *e) {
 594	Client *c;
 595	Monitor *m;
 596	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 597	XWindowChanges wc;
 598
 599	if((c = wintoclient(ev->window))) {
 600		if(ev->value_mask & CWBorderWidth)
 601			c->bw = ev->border_width;
 602		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 603			m = c->mon;
 604			if(ev->value_mask & CWX) {
 605				c->oldx = c->x;
 606				c->x = m->mx + ev->x;
 607			}
 608			if(ev->value_mask & CWY) {
 609				c->oldy = c->y;
 610				c->y = m->my + ev->y;
 611			}
 612			if(ev->value_mask & CWWidth) {
 613				c->oldw = c->w;
 614				c->w = ev->width;
 615			}
 616			if(ev->value_mask & CWHeight) {
 617				c->oldh = c->h;
 618				c->h = ev->height;
 619			}
 620			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 621				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 622			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 623				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 624			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 625				configure(c);
 626			if(ISVISIBLE(c))
 627				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 628		}
 629		else
 630			configure(c);
 631	}
 632	else {
 633		wc.x = ev->x;
 634		wc.y = ev->y;
 635		wc.width = ev->width;
 636		wc.height = ev->height;
 637		wc.border_width = ev->border_width;
 638		wc.sibling = ev->above;
 639		wc.stack_mode = ev->detail;
 640		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 641	}
 642	XSync(dpy, False);
 643}
 644
 645Monitor *
 646createmon(void) {
 647	Monitor *m;
 648
 649	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 650		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 651	m->tagset[0] = m->tagset[1] = 1;
 652	m->mfact = mfact;
 653	m->nmaster = nmaster;
 654	m->showbar = showbar;
 655	m->topbar = topbar;
 656	m->lt[0] = &layouts[0];
 657	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 658	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 659	return m;
 660}
 661
 662void
 663destroynotify(XEvent *e) {
 664	Client *c;
 665	XDestroyWindowEvent *ev = &e->xdestroywindow;
 666
 667	if((c = wintoclient(ev->window)))
 668		unmanage(c, True);
 669}
 670
 671void
 672detach(Client *c) {
 673	Client **tc;
 674
 675	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 676	*tc = c->next;
 677}
 678
 679void
 680detachstack(Client *c) {
 681	Client **tc, *t;
 682
 683	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 684	*tc = c->snext;
 685
 686	if(c == c->mon->sel) {
 687		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 688		c->mon->sel = t;
 689	}
 690}
 691
 692void
 693die(const char *errstr, ...) {
 694	va_list ap;
 695
 696	va_start(ap, errstr);
 697	vfprintf(stderr, errstr, ap);
 698	va_end(ap);
 699	exit(EXIT_FAILURE);
 700}
 701
 702Monitor *
 703dirtomon(int dir) {
 704	Monitor *m = NULL;
 705
 706	if(dir > 0) {
 707		if(!(m = selmon->next))
 708			m = mons;
 709	}
 710	else if(selmon == mons)
 711		for(m = mons; m->next; m = m->next);
 712	else
 713		for(m = mons; m->next != selmon; m = m->next);
 714	return m;
 715}
 716
 717void
 718drawbar(Monitor *m) {
 719	int x;
 720	unsigned int i, occ = 0, urg = 0;
 721	unsigned long *col;
 722	Client *c;
 723
 724	for(c = m->clients; c; c = c->next) {
 725		occ |= c->tags;
 726		if(c->isurgent)
 727			urg |= c->tags;
 728	}
 729	dc.x = 0;
 730	for(i = 0; i < LENGTH(tags); i++) {
 731		dc.w = TEXTW(tags[i]);
 732		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 733		drawtext(tags[i], col, urg & 1 << i);
 734		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 735		           occ & 1 << i, urg & 1 << i, col);
 736		dc.x += dc.w;
 737	}
 738	dc.w = blw = TEXTW(m->ltsymbol);
 739	drawtext(m->ltsymbol, dc.norm, False);
 740	dc.x += dc.w;
 741	x = dc.x;
 742	if(m == selmon) { /* status is only drawn on selected monitor */
 743		dc.w = TEXTW(stext);
 744		dc.x = m->ww - dc.w;
 745		if(dc.x < x) {
 746			dc.x = x;
 747			dc.w = m->ww - x;
 748		}
 749		drawtext(stext, dc.norm, False);
 750	}
 751	else
 752		dc.x = m->ww;
 753	if((dc.w = dc.x - x) > bh) {
 754		dc.x = x;
 755		if(m->sel) {
 756			col = m == selmon ? dc.sel : dc.norm;
 757			drawtext(m->sel->name, col, False);
 758			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 759		}
 760		else
 761			drawtext(NULL, dc.norm, False);
 762	}
 763	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 764	XSync(dpy, False);
 765}
 766
 767void
 768drawbars(void) {
 769	Monitor *m;
 770
 771	for(m = mons; m; m = m->next)
 772		drawbar(m);
 773}
 774
 775void
 776drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 777	int x;
 778
 779	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 780	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 781	if(filled)
 782		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 783	else if(empty)
 784		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 785}
 786
 787void
 788drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 789	char buf[256];
 790	int i, x, y, h, len, olen;
 791
 792	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 793	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 794	if(!text)
 795		return;
 796	olen = strlen(text);
 797	h = dc.font.ascent + dc.font.descent;
 798	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 799	x = dc.x + (h / 2);
 800	/* shorten text if necessary */
 801	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 802	if(!len)
 803		return;
 804	memcpy(buf, text, len);
 805	if(len < olen)
 806		for(i = len; i && i > len - 3; buf[--i] = '.');
 807	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 808	if(dc.font.set)
 809		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 810	else
 811		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 812}
 813
 814void
 815enternotify(XEvent *e) {
 816	Client *c;
 817	Monitor *m;
 818	XCrossingEvent *ev = &e->xcrossing;
 819
 820	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 821		return;
 822	c = wintoclient(ev->window);
 823	m = c ? c->mon : wintomon(ev->window);
 824	if(m != selmon) {
 825		unfocus(selmon->sel, True);
 826		selmon = m;
 827	}
 828	else if(!c || c == selmon->sel)
 829		return;
 830	focus(c);
 831}
 832
 833void
 834expose(XEvent *e) {
 835	Monitor *m;
 836	XExposeEvent *ev = &e->xexpose;
 837
 838	if(ev->count == 0 && (m = wintomon(ev->window)))
 839		drawbar(m);
 840}
 841
 842void
 843focus(Client *c) {
 844	if(!c || !ISVISIBLE(c))
 845		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 846	/* was if(selmon->sel) */
 847	if(selmon->sel && selmon->sel != c)
 848		unfocus(selmon->sel, False);
 849	if(c) {
 850		if(c->mon != selmon)
 851			selmon = c->mon;
 852		if(c->isurgent)
 853			clearurgent(c);
 854		detachstack(c);
 855		attachstack(c);
 856		grabbuttons(c, True);
 857		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 858		setfocus(c);
 859	}
 860	else {
 861		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 862		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 863	}
 864	selmon->sel = c;
 865	drawbars();
 866}
 867
 868void
 869focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 870	XFocusChangeEvent *ev = &e->xfocus;
 871
 872	if(selmon->sel && ev->window != selmon->sel->win)
 873		setfocus(selmon->sel);
 874}
 875
 876void
 877focusmon(const Arg *arg) {
 878	Monitor *m;
 879
 880	if(!mons->next)
 881		return;
 882	if((m = dirtomon(arg->i)) == selmon)
 883		return;
 884	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 885					in gedit and anjuta */
 886	selmon = m;
 887	focus(NULL);
 888}
 889
 890void
 891focusstack(const Arg *arg) {
 892	Client *c = NULL, *i;
 893
 894	if(!selmon->sel)
 895		return;
 896	if(arg->i > 0) {
 897		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 898		if(!c)
 899			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 900	}
 901	else {
 902		for(i = selmon->clients; i != selmon->sel; i = i->next)
 903			if(ISVISIBLE(i))
 904				c = i;
 905		if(!c)
 906			for(; i; i = i->next)
 907				if(ISVISIBLE(i))
 908					c = i;
 909	}
 910	if(c) {
 911		focus(c);
 912		restack(selmon);
 913	}
 914}
 915
 916Atom
 917getatomprop(Client *c, Atom prop) {
 918	int di;
 919	unsigned long dl;
 920	unsigned char *p = NULL;
 921	Atom da, atom = None;
 922
 923	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 924	                      &da, &di, &dl, &dl, &p) == Success && p) {
 925		atom = *(Atom *)p;
 926		XFree(p);
 927	}
 928	return atom;
 929}
 930
 931unsigned long
 932getcolor(const char *colstr) {
 933	Colormap cmap = DefaultColormap(dpy, screen);
 934	XColor color;
 935
 936	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 937		die("error, cannot allocate color '%s'\n", colstr);
 938	return color.pixel;
 939}
 940
 941Bool
 942getrootptr(int *x, int *y) {
 943	int di;
 944	unsigned int dui;
 945	Window dummy;
 946
 947	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 948}
 949
 950long
 951getstate(Window w) {
 952	int format;
 953	long result = -1;
 954	unsigned char *p = NULL;
 955	unsigned long n, extra;
 956	Atom real;
 957
 958	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 959	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 960		return -1;
 961	if(n != 0)
 962		result = *p;
 963	XFree(p);
 964	return result;
 965}
 966
 967Bool
 968gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 969	char **list = NULL;
 970	int n;
 971	XTextProperty name;
 972
 973	if(!text || size == 0)
 974		return False;
 975	text[0] = '\0';
 976	XGetTextProperty(dpy, w, &name, atom);
 977	if(!name.nitems)
 978		return False;
 979	if(name.encoding == XA_STRING)
 980		strncpy(text, (char *)name.value, size - 1);
 981	else {
 982		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 983			strncpy(text, *list, size - 1);
 984			XFreeStringList(list);
 985		}
 986	}
 987	text[size - 1] = '\0';
 988	XFree(name.value);
 989	return True;
 990}
 991
 992void
 993grabbuttons(Client *c, Bool focused) {
 994	updatenumlockmask();
 995	{
 996		unsigned int i, j;
 997		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 998		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 999		if(focused) {
1000			for(i = 0; i < LENGTH(buttons); i++)
1001				if(buttons[i].click == ClkClientWin)
1002					for(j = 0; j < LENGTH(modifiers); j++)
1003						XGrabButton(dpy, buttons[i].button,
1004						            buttons[i].mask | modifiers[j],
1005						            c->win, False, BUTTONMASK,
1006						            GrabModeAsync, GrabModeSync, None, None);
1007		}
1008		else
1009			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1010			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1011	}
1012}
1013
1014void
1015grabkeys(void) {
1016	updatenumlockmask();
1017	{
1018		unsigned int i, j;
1019		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1020		KeyCode code;
1021
1022		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1023		for(i = 0; i < LENGTH(keys); i++)
1024			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1025				for(j = 0; j < LENGTH(modifiers); j++)
1026					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1027						 True, GrabModeAsync, GrabModeAsync);
1028	}
1029}
1030
1031void
1032incnmaster(const Arg *arg) {
1033	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1034	arrange(selmon);
1035}
1036
1037void
1038initfont(const char *fontstr) {
1039	char *def, **missing;
1040	int n;
1041
1042	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1043	if(missing) {
1044		while(n--)
1045			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1046		XFreeStringList(missing);
1047	}
1048	if(dc.font.set) {
1049		XFontStruct **xfonts;
1050		char **font_names;
1051
1052		dc.font.ascent = dc.font.descent = 0;
1053		XExtentsOfFontSet(dc.font.set);
1054		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1055		while(n--) {
1056			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1057			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1058			xfonts++;
1059		}
1060	}
1061	else {
1062		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1063		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1064			die("error, cannot load font: '%s'\n", fontstr);
1065		dc.font.ascent = dc.font.xfont->ascent;
1066		dc.font.descent = dc.font.xfont->descent;
1067	}
1068	dc.font.height = dc.font.ascent + dc.font.descent;
1069}
1070
1071#ifdef XINERAMA
1072static Bool
1073isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1074	while(n--)
1075		/* treat origin (x, y) as fixpoint for uniqueness only, first screen wins */
1076		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org)
1077			return False;
1078	return True;
1079}
1080#endif /* XINERAMA */
1081
1082void
1083keypress(XEvent *e) {
1084	unsigned int i;
1085	KeySym keysym;
1086	XKeyEvent *ev;
1087
1088	ev = &e->xkey;
1089	keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1090	for(i = 0; i < LENGTH(keys); i++)
1091		if(keysym == keys[i].keysym
1092		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1093		&& keys[i].func)
1094			keys[i].func(&(keys[i].arg));
1095}
1096
1097void
1098killclient(const Arg *arg) {
1099	if(!selmon->sel)
1100		return;
1101	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1102		XGrabServer(dpy);
1103		XSetErrorHandler(xerrordummy);
1104		XSetCloseDownMode(dpy, DestroyAll);
1105		XKillClient(dpy, selmon->sel->win);
1106		XSync(dpy, False);
1107		XSetErrorHandler(xerror);
1108		XUngrabServer(dpy);
1109	}
1110}
1111
1112void
1113manage(Window w, XWindowAttributes *wa) {
1114	Client *c, *t = NULL;
1115	Window trans = None;
1116	XWindowChanges wc;
1117
1118	if(!(c = calloc(1, sizeof(Client))))
1119		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1120	c->win = w;
1121	updatetitle(c);
1122	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1123		c->mon = t->mon;
1124		c->tags = t->tags;
1125	}
1126	else {
1127		c->mon = selmon;
1128		applyrules(c);
1129	}
1130	/* geometry */
1131	c->x = c->oldx = wa->x;
1132	c->y = c->oldy = wa->y;
1133	c->w = c->oldw = wa->width;
1134	c->h = c->oldh = wa->height;
1135	c->oldbw = wa->border_width;
1136
1137	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1138		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1139	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1140		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1141	c->x = MAX(c->x, c->mon->mx);
1142	/* only fix client y-offset, if the client center might cover the bar */
1143	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1144	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1145	c->bw = borderpx;
1146
1147	wc.border_width = c->bw;
1148	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1149	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1150	configure(c); /* propagates border_width, if size doesn't change */
1151	updatewindowtype(c);
1152	updatesizehints(c);
1153	updatewmhints(c);
1154	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1155	grabbuttons(c, False);
1156	if(!c->isfloating)
1157		c->isfloating = c->oldstate = trans != None || c->isfixed;
1158	if(c->isfloating)
1159		XRaiseWindow(dpy, c->win);
1160	attach(c);
1161	attachstack(c);
1162	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1163	                (unsigned char *) &(c->win), 1);
1164	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1165	setclientstate(c, NormalState);
1166	if (c->mon == selmon)
1167		unfocus(selmon->sel, False);
1168	c->mon->sel = c;
1169	arrange(c->mon);
1170	XMapWindow(dpy, c->win);
1171	focus(NULL);
1172}
1173
1174void
1175mappingnotify(XEvent *e) {
1176	XMappingEvent *ev = &e->xmapping;
1177
1178	XRefreshKeyboardMapping(ev);
1179	if(ev->request == MappingKeyboard)
1180		grabkeys();
1181}
1182
1183void
1184maprequest(XEvent *e) {
1185	static XWindowAttributes wa;
1186	XMapRequestEvent *ev = &e->xmaprequest;
1187
1188	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1189		return;
1190	if(wa.override_redirect)
1191		return;
1192	if(!wintoclient(ev->window))
1193		manage(ev->window, &wa);
1194}
1195
1196void
1197monocle(Monitor *m) {
1198	unsigned int n = 0;
1199	Client *c;
1200
1201	for(c = m->clients; c; c = c->next)
1202		if(ISVISIBLE(c))
1203			n++;
1204	if(n > 0) /* override layout symbol */
1205		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1206	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1207		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1208}
1209
1210void
1211motionnotify(XEvent *e) {
1212	static Monitor *mon = NULL;
1213	Monitor *m;
1214	XMotionEvent *ev = &e->xmotion;
1215
1216	if(ev->window != root)
1217		return;
1218	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1219		unfocus(selmon->sel, True);
1220		selmon = m;
1221		focus(NULL);
1222	}
1223	mon = m;
1224}
1225
1226void
1227movemouse(const Arg *arg) {
1228	int x, y, ocx, ocy, nx, ny;
1229	Client *c;
1230	Monitor *m;
1231	XEvent ev;
1232
1233	if(!(c = selmon->sel))
1234		return;
1235	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1236		return;
1237	restack(selmon);
1238	ocx = c->x;
1239	ocy = c->y;
1240	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1241	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1242		return;
1243	if(!getrootptr(&x, &y))
1244		return;
1245	do {
1246		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1247		switch(ev.type) {
1248		case ConfigureRequest:
1249		case Expose:
1250		case MapRequest:
1251			handler[ev.type](&ev);
1252			break;
1253		case MotionNotify:
1254			nx = ocx + (ev.xmotion.x - x);
1255			ny = ocy + (ev.xmotion.y - y);
1256			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1257			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1258				if(abs(selmon->wx - nx) < snap)
1259					nx = selmon->wx;
1260				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1261					nx = selmon->wx + selmon->ww - WIDTH(c);
1262				if(abs(selmon->wy - ny) < snap)
1263					ny = selmon->wy;
1264				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1265					ny = selmon->wy + selmon->wh - HEIGHT(c);
1266				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1267				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1268					togglefloating(NULL);
1269			}
1270			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1271				resize(c, nx, ny, c->w, c->h, True);
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	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1382		return;
1383	restack(selmon);
1384	ocx = c->x;
1385	ocy = c->y;
1386	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1387	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1388		return;
1389	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1390	do {
1391		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1392		switch(ev.type) {
1393		case ConfigureRequest:
1394		case Expose:
1395		case MapRequest:
1396			handler[ev.type](&ev);
1397			break;
1398		case MotionNotify:
1399			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1400			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1401			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1402			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1403			{
1404				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1405				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1406					togglefloating(NULL);
1407			}
1408			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1409				resize(c, c->x, c->y, nw, nh, True);
1410			break;
1411		}
1412	} while(ev.type != ButtonRelease);
1413	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1414	XUngrabPointer(dpy, CurrentTime);
1415	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1416	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1417		sendmon(c, m);
1418		selmon = m;
1419		focus(NULL);
1420	}
1421}
1422
1423void
1424restack(Monitor *m) {
1425	Client *c;
1426	XEvent ev;
1427	XWindowChanges wc;
1428
1429	drawbar(m);
1430	if(!m->sel)
1431		return;
1432	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1433		XRaiseWindow(dpy, m->sel->win);
1434	if(m->lt[m->sellt]->arrange) {
1435		wc.stack_mode = Below;
1436		wc.sibling = m->barwin;
1437		for(c = m->stack; c; c = c->snext)
1438			if(!c->isfloating && ISVISIBLE(c)) {
1439				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1440				wc.sibling = c->win;
1441			}
1442	}
1443	XSync(dpy, False);
1444	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1445}
1446
1447void
1448run(void) {
1449	XEvent ev;
1450	/* main event loop */
1451	XSync(dpy, False);
1452	while(running && !XNextEvent(dpy, &ev))
1453		if(handler[ev.type])
1454			handler[ev.type](&ev); /* call handler */
1455}
1456
1457void
1458scan(void) {
1459	unsigned int i, num;
1460	Window d1, d2, *wins = NULL;
1461	XWindowAttributes wa;
1462
1463	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1464		for(i = 0; i < num; i++) {
1465			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1466			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1467				continue;
1468			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1469				manage(wins[i], &wa);
1470		}
1471		for(i = 0; i < num; i++) { /* now the transients */
1472			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1473				continue;
1474			if(XGetTransientForHint(dpy, wins[i], &d1)
1475			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1476				manage(wins[i], &wa);
1477		}
1478		if(wins)
1479			XFree(wins);
1480	}
1481}
1482
1483void
1484sendmon(Client *c, Monitor *m) {
1485	if(c->mon == m)
1486		return;
1487	unfocus(c, True);
1488	detach(c);
1489	detachstack(c);
1490	c->mon = m;
1491	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1492	attach(c);
1493	attachstack(c);
1494	focus(NULL);
1495	arrange(NULL);
1496}
1497
1498void
1499setclientstate(Client *c, long state) {
1500	long data[] = { state, None };
1501
1502	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1503			PropModeReplace, (unsigned char *)data, 2);
1504}
1505
1506Bool
1507sendevent(Client *c, Atom proto) {
1508	int n;
1509	Atom *protocols;
1510	Bool exists = False;
1511	XEvent ev;
1512
1513	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1514		while(!exists && n--)
1515			exists = protocols[n] == proto;
1516		XFree(protocols);
1517	}
1518	if(exists) {
1519		ev.type = ClientMessage;
1520		ev.xclient.window = c->win;
1521		ev.xclient.message_type = wmatom[WMProtocols];
1522		ev.xclient.format = 32;
1523		ev.xclient.data.l[0] = proto;
1524		ev.xclient.data.l[1] = CurrentTime;
1525		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1526	}
1527	return exists;
1528}
1529
1530void
1531setfocus(Client *c) {
1532	if(!c->neverfocus) {
1533		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1534		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1535 		                XA_WINDOW, 32, PropModeReplace,
1536 		                (unsigned char *) &(c->win), 1);
1537	}
1538	sendevent(c, wmatom[WMTakeFocus]);
1539}
1540
1541void
1542setfullscreen(Client *c, Bool fullscreen) {
1543	if(fullscreen) {
1544		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1545		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1546		c->isfullscreen = True;
1547		c->oldstate = c->isfloating;
1548		c->oldbw = c->bw;
1549		c->bw = 0;
1550		c->isfloating = True;
1551		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1552		XRaiseWindow(dpy, c->win);
1553	}
1554	else {
1555		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1556		                PropModeReplace, (unsigned char*)0, 0);
1557		c->isfullscreen = False;
1558		c->isfloating = c->oldstate;
1559		c->bw = c->oldbw;
1560		c->x = c->oldx;
1561		c->y = c->oldy;
1562		c->w = c->oldw;
1563		c->h = c->oldh;
1564		resizeclient(c, c->x, c->y, c->w, c->h);
1565		arrange(c->mon);
1566	}
1567}
1568
1569void
1570setlayout(const Arg *arg) {
1571	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1572		selmon->sellt ^= 1;
1573	if(arg && arg->v)
1574		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1575	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1576	if(selmon->sel)
1577		arrange(selmon);
1578	else
1579		drawbar(selmon);
1580}
1581
1582/* arg > 1.0 will set mfact absolutly */
1583void
1584setmfact(const Arg *arg) {
1585	float f;
1586
1587	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1588		return;
1589	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1590	if(f < 0.1 || f > 0.9)
1591		return;
1592	selmon->mfact = f;
1593	arrange(selmon);
1594}
1595
1596void
1597setup(void) {
1598	XSetWindowAttributes wa;
1599
1600	/* clean up any zombies immediately */
1601	sigchld(0);
1602
1603	/* init screen */
1604	screen = DefaultScreen(dpy);
1605	root = RootWindow(dpy, screen);
1606	initfont(font);
1607	sw = DisplayWidth(dpy, screen);
1608	sh = DisplayHeight(dpy, screen);
1609	bh = dc.h = dc.font.height + 2;
1610	updategeom();
1611	/* init atoms */
1612	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1613	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1614	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1615	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1616	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1617	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1618	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1619	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1620	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1621	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1622	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1623	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", 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	XDeleteProperty(dpy, root, netatom[NetClientList]);
1647	/* select for events */
1648	wa.cursor = cursor[CurNormal];
1649	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1650	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1651	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1652	XSelectInput(dpy, root, wa.event_mask);
1653	grabkeys();
1654}
1655
1656void
1657showhide(Client *c) {
1658	if(!c)
1659		return;
1660	if(ISVISIBLE(c)) { /* show clients top down */
1661		XMoveWindow(dpy, c->win, c->x, c->y);
1662		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1663			resize(c, c->x, c->y, c->w, c->h, False);
1664		showhide(c->snext);
1665	}
1666	else { /* hide clients bottom up */
1667		showhide(c->snext);
1668		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1669	}
1670}
1671
1672void
1673sigchld(int unused) {
1674	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1675		die("Can't install SIGCHLD handler");
1676	while(0 < waitpid(-1, NULL, WNOHANG));
1677}
1678
1679void
1680spawn(const Arg *arg) {
1681	if(fork() == 0) {
1682		if(dpy)
1683			close(ConnectionNumber(dpy));
1684		setsid();
1685		execvp(((char **)arg->v)[0], (char **)arg->v);
1686		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1687		perror(" failed");
1688		exit(EXIT_SUCCESS);
1689	}
1690}
1691
1692void
1693tag(const Arg *arg) {
1694	if(selmon->sel && arg->ui & TAGMASK) {
1695		selmon->sel->tags = arg->ui & TAGMASK;
1696		focus(NULL);
1697		arrange(selmon);
1698	}
1699}
1700
1701void
1702tagmon(const Arg *arg) {
1703	if(!selmon->sel || !mons->next)
1704		return;
1705	sendmon(selmon->sel, dirtomon(arg->i));
1706}
1707
1708int
1709textnw(const char *text, unsigned int len) {
1710	XRectangle r;
1711
1712	if(dc.font.set) {
1713		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1714		return r.width;
1715	}
1716	return XTextWidth(dc.font.xfont, text, len);
1717}
1718
1719void
1720tile(Monitor *m) {
1721	unsigned int i, n, h, mw, my, ty;
1722	Client *c;
1723
1724	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1725	if(n == 0)
1726		return;
1727
1728	if(n > m->nmaster)
1729		mw = m->nmaster ? m->ww * m->mfact : 0;
1730	else
1731		mw = m->ww;
1732	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1733		if(i < m->nmaster) {
1734			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1735			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1736			my += HEIGHT(c);
1737		}
1738		else {
1739			h = (m->wh - ty) / (n - i);
1740			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1741			ty += HEIGHT(c);
1742		}
1743}
1744
1745void
1746togglebar(const Arg *arg) {
1747	selmon->showbar = !selmon->showbar;
1748	updatebarpos(selmon);
1749	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1750	arrange(selmon);
1751}
1752
1753void
1754togglefloating(const Arg *arg) {
1755	if(!selmon->sel)
1756		return;
1757	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1758		return;
1759	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1760	if(selmon->sel->isfloating)
1761		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1762		       selmon->sel->w, selmon->sel->h, False);
1763	arrange(selmon);
1764}
1765
1766void
1767toggletag(const Arg *arg) {
1768	unsigned int newtags;
1769
1770	if(!selmon->sel)
1771		return;
1772	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1773	if(newtags) {
1774		selmon->sel->tags = newtags;
1775		focus(NULL);
1776		arrange(selmon);
1777	}
1778}
1779
1780void
1781toggleview(const Arg *arg) {
1782	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1783
1784	if(newtagset) {
1785		selmon->tagset[selmon->seltags] = newtagset;
1786		focus(NULL);
1787		arrange(selmon);
1788	}
1789}
1790
1791void
1792unfocus(Client *c, Bool setfocus) {
1793	if(!c)
1794		return;
1795	grabbuttons(c, False);
1796	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1797	if(setfocus) {
1798		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1799		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1800	}
1801}
1802
1803void
1804unmanage(Client *c, Bool destroyed) {
1805	Monitor *m = c->mon;
1806	XWindowChanges wc;
1807
1808	/* The server grab construct avoids race conditions. */
1809	detach(c);
1810	detachstack(c);
1811	if(!destroyed) {
1812		wc.border_width = c->oldbw;
1813		XGrabServer(dpy);
1814		XSetErrorHandler(xerrordummy);
1815		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1816		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1817		setclientstate(c, WithdrawnState);
1818		XSync(dpy, False);
1819		XSetErrorHandler(xerror);
1820		XUngrabServer(dpy);
1821	}
1822	free(c);
1823	focus(NULL);
1824	updateclientlist();
1825	arrange(m);
1826}
1827
1828void
1829unmapnotify(XEvent *e) {
1830	Client *c;
1831	XUnmapEvent *ev = &e->xunmap;
1832
1833	if((c = wintoclient(ev->window))) {
1834		if(ev->send_event)
1835			setclientstate(c, WithdrawnState);
1836		else
1837			unmanage(c, False);
1838	}
1839}
1840
1841void
1842updatebars(void) {
1843	Monitor *m;
1844	XSetWindowAttributes wa = {
1845		.override_redirect = True,
1846		.background_pixmap = ParentRelative,
1847		.event_mask = ButtonPressMask|ExposureMask
1848	};
1849	for(m = mons; m; m = m->next) {
1850		if (m->barwin)
1851			continue;
1852		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1853		                          CopyFromParent, DefaultVisual(dpy, screen),
1854		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1855		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1856		XMapRaised(dpy, m->barwin);
1857	}
1858}
1859
1860void
1861updatebarpos(Monitor *m) {
1862	m->wy = m->my;
1863	m->wh = m->mh;
1864	if(m->showbar) {
1865		m->wh -= bh;
1866		m->by = m->topbar ? m->wy : m->wy + m->wh;
1867		m->wy = m->topbar ? m->wy + bh : m->wy;
1868	}
1869	else
1870		m->by = -bh;
1871}
1872
1873void
1874updateclientlist() {
1875	Client *c;
1876	Monitor *m;
1877
1878	XDeleteProperty(dpy, root, netatom[NetClientList]);
1879	for(m = mons; m; m = m->next)
1880		for(c = m->clients; c; c = c->next)
1881			XChangeProperty(dpy, root, netatom[NetClientList],
1882			                XA_WINDOW, 32, PropModeAppend,
1883			                (unsigned char *) &(c->win), 1);
1884}
1885
1886void
1887updategeom(void) {
1888	/* Starting with dwm 6.1 this function uses a new (simpler) strategy:
1889	 * whenever screen changes are reported, we destroy all monitors
1890	 * and recreate all unique origin monitors and add all clients to
1891	 * the first monitor, only. In several circumstances this may suck,
1892	 * but dealing with all corner-cases sucks even more.*/
1893
1894#ifdef XINERAMA
1895	if(XineramaIsActive(dpy)) {
1896		int i, j, n;
1897		Client *c;
1898		Monitor *m, *oldmons = mons;
1899		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &n);
1900		XineramaScreenInfo *unique = NULL;
1901
1902		/* only consider unique geometries as separate screens */
1903		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * n)))
1904			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * n);
1905		for(i = 0, j = 0; i < n; i++)
1906			if(isuniquegeom(unique, j, &info[i]))
1907				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1908		XFree(info);
1909		/* create new monitor structure */
1910		n = j;
1911		mons = m = createmon(); /* new first monitor */
1912		for(i = 1; i < n; i++) {
1913			m->next = createmon();
1914			m = m->next;
1915		}
1916		for(i = 0, m = mons; i < n && m; m = m->next, i++) {
1917			m->num = i;
1918			m->mx = m->wx = unique[i].x_org;
1919			m->my = m->wy = unique[i].y_org;
1920			m->mw = m->ww = unique[i].width;
1921			m->mh = m->wh = unique[i].height;
1922			updatebarpos(m);
1923		}
1924		free(unique);
1925		/* re-attach old clients and cleanup old monitor structure */
1926		while(oldmons) {
1927			m = oldmons;
1928			while(m->clients) {
1929				c = m->clients;
1930				m->clients = c->next;
1931				detachstack(c);
1932				c->mon = mons;
1933				attach(c);
1934				attachstack(c);
1935			}
1936			oldmons = m->next;
1937			cleanupmon(m);
1938		}
1939	}
1940	else
1941#endif /* XINERAMA */
1942	/* default monitor setup */
1943	{
1944		if(!mons) /* only true if !XINERAMA compile flag */
1945			mons = createmon();
1946		if(mons->mw != sw || mons->mh != sh) {
1947			mons->mw = mons->ww = sw;
1948			mons->mh = mons->wh = sh;
1949			updatebarpos(mons);
1950		}
1951	}
1952	selmon = mons;
1953	selmon = wintomon(root);
1954}
1955
1956void
1957updatenumlockmask(void) {
1958	unsigned int i, j;
1959	XModifierKeymap *modmap;
1960
1961	numlockmask = 0;
1962	modmap = XGetModifierMapping(dpy);
1963	for(i = 0; i < 8; i++)
1964		for(j = 0; j < modmap->max_keypermod; j++)
1965			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1966			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1967				numlockmask = (1 << i);
1968	XFreeModifiermap(modmap);
1969}
1970
1971void
1972updatesizehints(Client *c) {
1973	long msize;
1974	XSizeHints size;
1975
1976	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1977		/* size is uninitialized, ensure that size.flags aren't used */
1978		size.flags = PSize;
1979	if(size.flags & PBaseSize) {
1980		c->basew = size.base_width;
1981		c->baseh = size.base_height;
1982	}
1983	else if(size.flags & PMinSize) {
1984		c->basew = size.min_width;
1985		c->baseh = size.min_height;
1986	}
1987	else
1988		c->basew = c->baseh = 0;
1989	if(size.flags & PResizeInc) {
1990		c->incw = size.width_inc;
1991		c->inch = size.height_inc;
1992	}
1993	else
1994		c->incw = c->inch = 0;
1995	if(size.flags & PMaxSize) {
1996		c->maxw = size.max_width;
1997		c->maxh = size.max_height;
1998	}
1999	else
2000		c->maxw = c->maxh = 0;
2001	if(size.flags & PMinSize) {
2002		c->minw = size.min_width;
2003		c->minh = size.min_height;
2004	}
2005	else if(size.flags & PBaseSize) {
2006		c->minw = size.base_width;
2007		c->minh = size.base_height;
2008	}
2009	else
2010		c->minw = c->minh = 0;
2011	if(size.flags & PAspect) {
2012		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2013		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2014	}
2015	else
2016		c->maxa = c->mina = 0.0;
2017	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2018	             && c->maxw == c->minw && c->maxh == c->minh);
2019}
2020
2021void
2022updatetitle(Client *c) {
2023	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2024		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2025	if(c->name[0] == '\0') /* hack to mark broken clients */
2026		strcpy(c->name, broken);
2027}
2028
2029void
2030updatestatus(void) {
2031	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2032		strcpy(stext, "dwm-"VERSION);
2033	drawbar(selmon);
2034}
2035
2036void
2037updatewindowtype(Client *c) {
2038	Atom state = getatomprop(c, netatom[NetWMState]);
2039	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2040
2041	if(state == netatom[NetWMFullscreen])
2042		setfullscreen(c, True);
2043	if(wtype == netatom[NetWMWindowTypeDialog])
2044		c->isfloating = True;
2045}
2046
2047void
2048updatewmhints(Client *c) {
2049	XWMHints *wmh;
2050
2051	if((wmh = XGetWMHints(dpy, c->win))) {
2052		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2053			wmh->flags &= ~XUrgencyHint;
2054			XSetWMHints(dpy, c->win, wmh);
2055		}
2056		else
2057			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2058		if(wmh->flags & InputHint)
2059			c->neverfocus = !wmh->input;
2060		else
2061			c->neverfocus = False;
2062		XFree(wmh);
2063	}
2064}
2065
2066void
2067view(const Arg *arg) {
2068	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2069		return;
2070	selmon->seltags ^= 1; /* toggle sel tagset */
2071	if(arg->ui & TAGMASK)
2072		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2073	focus(NULL);
2074	arrange(selmon);
2075}
2076
2077Client *
2078wintoclient(Window w) {
2079	Client *c;
2080	Monitor *m;
2081
2082	for(m = mons; m; m = m->next)
2083		for(c = m->clients; c; c = c->next)
2084			if(c->win == w)
2085				return c;
2086	return NULL;
2087}
2088
2089Monitor *
2090wintomon(Window w) {
2091	int x, y;
2092	Client *c;
2093	Monitor *m;
2094
2095	if(w == root && getrootptr(&x, &y))
2096		return recttomon(x, y, 1, 1);
2097	for(m = mons; m; m = m->next)
2098		if(w == m->barwin)
2099			return m;
2100	if((c = wintoclient(w)))
2101		return c->mon;
2102	return selmon;
2103}
2104
2105/* There's no way to check accesses to destroyed windows, thus those cases are
2106 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2107 * default error handler, which may call exit.  */
2108int
2109xerror(Display *dpy, XErrorEvent *ee) {
2110	if(ee->error_code == BadWindow
2111	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2112	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2113	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2114	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2115	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2116	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2117	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2118	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2119		return 0;
2120	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2121			ee->request_code, ee->error_code);
2122	return xerrorxlib(dpy, ee); /* may call exit */
2123}
2124
2125int
2126xerrordummy(Display *dpy, XErrorEvent *ee) {
2127	return 0;
2128}
2129
2130/* Startup Error handler to check if another window manager
2131 * is already running. */
2132int
2133xerrorstart(Display *dpy, XErrorEvent *ee) {
2134	die("dwm: another window manager is already running\n");
2135	return -1;
2136}
2137
2138void
2139zoom(const Arg *arg) {
2140	Client *c = selmon->sel;
2141
2142	if(!selmon->lt[selmon->sellt]->arrange
2143	|| (selmon->sel && selmon->sel->isfloating))
2144		return;
2145	if(c == nexttiled(selmon->clients))
2146		if(!c || !(c = nexttiled(c->next)))
2147			return;
2148	pop(c);
2149}
2150
2151int
2152main(int argc, char *argv[]) {
2153	if(argc == 2 && !strcmp("-v", argv[1]))
2154		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2155	else if(argc != 1)
2156		die("usage: dwm [-v]\n");
2157	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2158		fputs("warning: no locale support\n", stderr);
2159	if(!(dpy = XOpenDisplay(NULL)))
2160		die("dwm: cannot open display\n");
2161	checkotherwm();
2162	setup();
2163	scan();
2164	run();
2165	cleanup();
2166	XCloseDisplay(dpy);
2167	return EXIT_SUCCESS;
2168}