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#include <fontconfig/fontconfig.h>
  41#include <X11/Xft/Xft.h>
  42#ifdef XINERAMA
  43#include <X11/extensions/Xinerama.h>
  44#endif /* XINERAMA */
  45
  46/* macros */
  47#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  48#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  49#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  50                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  51#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  52#define LENGTH(X)               (sizeof X / sizeof X[0])
  53#define MAX(A, B)               ((A) > (B) ? (A) : (B))
  54#define MIN(A, B)               ((A) < (B) ? (A) : (B))
  55#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  56#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  57#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  58#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  59#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  60
  61/* enums */
  62enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  63enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  64enum { NetSupported, NetWMName, NetWMState,
  65       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  66       NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  67enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  68enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  69       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  70
  71typedef union {
  72	int i;
  73	unsigned int ui;
  74	float f;
  75	const void *v;
  76} Arg;
  77
  78typedef struct {
  79	unsigned int click;
  80	unsigned int mask;
  81	unsigned int button;
  82	void (*func)(const Arg *arg);
  83	const Arg arg;
  84} Button;
  85
  86typedef struct Monitor Monitor;
  87typedef struct Client Client;
  88struct Client {
  89	char name[256];
  90	float mina, maxa;
  91	int x, y, w, h;
  92	int oldx, oldy, oldw, oldh;
  93	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  94	int bw, oldbw;
  95	unsigned int tags;
  96	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  97	Client *next;
  98	Client *snext;
  99	Monitor *mon;
 100	Window win;
 101};
 102
 103typedef struct {
 104	int x, y, w, h;
 105	XftColor norm[ColLast];
 106	XftColor sel[ColLast];
 107	Drawable drawable;
 108	GC gc;
 109	struct {
 110		int ascent;
 111		int descent;
 112		int height;
 113		XftFont *xfont;
 114	} font;
 115} DC; /* draw context */
 116
 117typedef struct {
 118	unsigned int mod;
 119	KeySym keysym;
 120	void (*func)(const Arg *);
 121	const Arg arg;
 122} Key;
 123
 124typedef struct {
 125	const char *symbol;
 126	void (*arrange)(Monitor *);
 127} Layout;
 128
 129struct Monitor {
 130	char ltsymbol[16];
 131	float mfact;
 132	int nmaster;
 133	int num;
 134	int by;               /* bar geometry */
 135	int mx, my, mw, mh;   /* screen size */
 136	int wx, wy, ww, wh;   /* window area  */
 137	unsigned int seltags;
 138	unsigned int sellt;
 139	unsigned int tagset[2];
 140	Bool showbar;
 141	Bool topbar;
 142	Client *clients;
 143	Client *sel;
 144	Client *stack;
 145	Monitor *next;
 146	Window barwin;
 147	const Layout *lt[2];
 148};
 149
 150typedef struct {
 151	const char *class;
 152	const char *instance;
 153	const char *title;
 154	unsigned int tags;
 155	Bool isfloating;
 156	int monitor;
 157} Rule;
 158
 159/* function declarations */
 160static void applyrules(Client *c);
 161static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 162static void arrange(Monitor *m);
 163static void arrangemon(Monitor *m);
 164static void attach(Client *c);
 165static void attachstack(Client *c);
 166static void buttonpress(XEvent *e);
 167static void checkotherwm(void);
 168static void cleanup(void);
 169static void cleanupmon(Monitor *mon);
 170static void clearurgent(Client *c);
 171static void clientmessage(XEvent *e);
 172static void configure(Client *c);
 173static void configurenotify(XEvent *e);
 174static void configurerequest(XEvent *e);
 175static Monitor *createmon(void);
 176static void destroynotify(XEvent *e);
 177static void detach(Client *c);
 178static void detachstack(Client *c);
 179static void die(const char *errstr, ...);
 180static Monitor *dirtomon(int dir);
 181static void drawbar(Monitor *m);
 182static void drawbars(void);
 183static void drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]);
 184static void drawtext(const char *text, XftColor col[ColLast], Bool invert);
 185static void enternotify(XEvent *e);
 186static void expose(XEvent *e);
 187static void focus(Client *c);
 188static void focusin(XEvent *e);
 189static void focusmon(const Arg *arg);
 190static void focusstack(const Arg *arg);
 191static XftColor getcolor(const char *colstr);
 192static Bool getrootptr(int *x, int *y);
 193static long getstate(Window w);
 194static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 195static void grabbuttons(Client *c, Bool focused);
 196static void grabkeys(void);
 197static void incnmaster(const Arg *arg);
 198static void initfont(const char *fontstr);
 199static void keypress(XEvent *e);
 200static void killclient(const Arg *arg);
 201static void manage(Window w, XWindowAttributes *wa);
 202static void mappingnotify(XEvent *e);
 203static void maprequest(XEvent *e);
 204static void monocle(Monitor *m);
 205static void motionnotify(XEvent *e);
 206static void movemouse(const Arg *arg);
 207static Client *nexttiled(Client *c);
 208static void pop(Client *);
 209static void propertynotify(XEvent *e);
 210static void quit(const Arg *arg);
 211static Monitor *recttomon(int x, int y, int w, int h);
 212static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 213static void resizeclient(Client *c, int x, int y, int w, int h);
 214static void resizemouse(const Arg *arg);
 215static void restack(Monitor *m);
 216static void run(void);
 217static void scan(void);
 218static Bool sendevent(Client *c, Atom proto);
 219static void sendmon(Client *c, Monitor *m);
 220static void setclientstate(Client *c, long state);
 221static void setfocus(Client *c);
 222static void setfullscreen(Client *c, Bool fullscreen);
 223static void setlayout(const Arg *arg);
 224static void setmfact(const Arg *arg);
 225static void setup(void);
 226static void showhide(Client *c);
 227static void sigchld(int unused);
 228static void spawn(const Arg *arg);
 229static void tag(const Arg *arg);
 230static void tagmon(const Arg *arg);
 231static int textnw(const char *text, unsigned int len);
 232static void tile(Monitor *);
 233static void togglebar(const Arg *arg);
 234static void togglefloating(const Arg *arg);
 235static void toggletag(const Arg *arg);
 236static void toggleview(const Arg *arg);
 237static void unfocus(Client *c, Bool setfocus);
 238static void unmanage(Client *c, Bool destroyed);
 239static void unmapnotify(XEvent *e);
 240static Bool updategeom(void);
 241static void updatebarpos(Monitor *m);
 242static void updatebars(void);
 243static void updateclientlist(void);
 244static void updatenumlockmask(void);
 245static void updatesizehints(Client *c);
 246static void updatestatus(void);
 247static void updatewindowtype(Client *c);
 248static void updatetitle(Client *c);
 249static void updatewmhints(Client *c);
 250static void view(const Arg *arg);
 251static Client *wintoclient(Window w);
 252static Monitor *wintomon(Window w);
 253static int xerror(Display *dpy, XErrorEvent *ee);
 254static int xerrordummy(Display *dpy, XErrorEvent *ee);
 255static int xerrorstart(Display *dpy, XErrorEvent *ee);
 256static void zoom(const Arg *arg);
 257
 258/* variables */
 259static const char broken[] = "broken";
 260static char stext[256];
 261static int screen;
 262static int sw, sh;           /* X display screen geometry width, height */
 263static int bh, blw = 0;      /* bar geometry */
 264static int (*xerrorxlib)(Display *, XErrorEvent *);
 265static unsigned int numlockmask = 0;
 266static void (*handler[LASTEvent]) (XEvent *) = {
 267	[ButtonPress] = buttonpress,
 268	[ClientMessage] = clientmessage,
 269	[ConfigureRequest] = configurerequest,
 270	[ConfigureNotify] = configurenotify,
 271	[DestroyNotify] = destroynotify,
 272	[EnterNotify] = enternotify,
 273	[Expose] = expose,
 274	[FocusIn] = focusin,
 275	[KeyPress] = keypress,
 276	[MappingNotify] = mappingnotify,
 277	[MapRequest] = maprequest,
 278	[MotionNotify] = motionnotify,
 279	[PropertyNotify] = propertynotify,
 280	[UnmapNotify] = unmapnotify
 281};
 282static Atom wmatom[WMLast], netatom[NetLast];
 283static Bool running = True;
 284static Cursor cursor[CurLast];
 285static Display *dpy;
 286static DC dc;
 287static Monitor *mons = NULL, *selmon = NULL;
 288static Window root;
 289
 290/* configuration, allows nested code to access above variables */
 291#include "config.h"
 292
 293/* compile-time check if all tags fit into an unsigned int bit array. */
 294struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 295
 296/* function implementations */
 297void
 298applyrules(Client *c) {
 299	const char *class, *instance;
 300	unsigned int i;
 301	const Rule *r;
 302	Monitor *m;
 303	XClassHint ch = { NULL, NULL };
 304
 305	/* rule matching */
 306	c->isfloating = c->tags = 0;
 307	XGetClassHint(dpy, c->win, &ch);
 308	class    = ch.res_class ? ch.res_class : broken;
 309	instance = ch.res_name  ? ch.res_name  : broken;
 310
 311	for(i = 0; i < LENGTH(rules); i++) {
 312		r = &rules[i];
 313		if((!r->title || strstr(c->name, r->title))
 314		&& (!r->class || strstr(class, r->class))
 315		&& (!r->instance || strstr(instance, r->instance)))
 316		{
 317			c->isfloating = r->isfloating;
 318			c->tags |= r->tags;
 319			for(m = mons; m && m->num != r->monitor; m = m->next);
 320			if(m)
 321				c->mon = m;
 322		}
 323	}
 324	if(ch.res_class)
 325		XFree(ch.res_class);
 326	if(ch.res_name)
 327		XFree(ch.res_name);
 328	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 329}
 330
 331Bool
 332applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 333	Bool baseismin;
 334	Monitor *m = c->mon;
 335
 336	/* set minimum possible */
 337	*w = MAX(1, *w);
 338	*h = MAX(1, *h);
 339	if(interact) {
 340		if(*x > sw)
 341			*x = sw - WIDTH(c);
 342		if(*y > sh)
 343			*y = sh - HEIGHT(c);
 344		if(*x + *w + 2 * c->bw < 0)
 345			*x = 0;
 346		if(*y + *h + 2 * c->bw < 0)
 347			*y = 0;
 348	}
 349	else {
 350		if(*x >= m->wx + m->ww)
 351			*x = m->wx + m->ww - WIDTH(c);
 352		if(*y >= m->wy + m->wh)
 353			*y = m->wy + m->wh - HEIGHT(c);
 354		if(*x + *w + 2 * c->bw <= m->wx)
 355			*x = m->wx;
 356		if(*y + *h + 2 * c->bw <= m->wy)
 357			*y = m->wy;
 358	}
 359	if(*h < bh)
 360		*h = bh;
 361	if(*w < bh)
 362		*w = bh;
 363	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 364		/* see last two sentences in ICCCM 4.1.2.3 */
 365		baseismin = c->basew == c->minw && c->baseh == c->minh;
 366		if(!baseismin) { /* temporarily remove base dimensions */
 367			*w -= c->basew;
 368			*h -= c->baseh;
 369		}
 370		/* adjust for aspect limits */
 371		if(c->mina > 0 && c->maxa > 0) {
 372			if(c->maxa < (float)*w / *h)
 373				*w = *h * c->maxa + 0.5;
 374			else if(c->mina < (float)*h / *w)
 375				*h = *w * c->mina + 0.5;
 376		}
 377		if(baseismin) { /* increment calculation requires this */
 378			*w -= c->basew;
 379			*h -= c->baseh;
 380		}
 381		/* adjust for increment value */
 382		if(c->incw)
 383			*w -= *w % c->incw;
 384		if(c->inch)
 385			*h -= *h % c->inch;
 386		/* restore base dimensions */
 387		*w = MAX(*w + c->basew, c->minw);
 388		*h = MAX(*h + c->baseh, c->minh);
 389		if(c->maxw)
 390			*w = MIN(*w, c->maxw);
 391		if(c->maxh)
 392			*h = MIN(*h, c->maxh);
 393	}
 394	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 395}
 396
 397void
 398arrange(Monitor *m) {
 399	if(m)
 400		showhide(m->stack);
 401	else for(m = mons; m; m = m->next)
 402		showhide(m->stack);
 403	if(m) {
 404		arrangemon(m);
 405		restack(m);
 406	} else for(m = mons; m; m = m->next)
 407		arrangemon(m);
 408}
 409
 410void
 411arrangemon(Monitor *m) {
 412	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 413	if(m->lt[m->sellt]->arrange)
 414		m->lt[m->sellt]->arrange(m);
 415}
 416
 417void
 418attach(Client *c) {
 419	c->next = c->mon->clients;
 420	c->mon->clients = c;
 421}
 422
 423void
 424attachstack(Client *c) {
 425	c->snext = c->mon->stack;
 426	c->mon->stack = c;
 427}
 428
 429void
 430buttonpress(XEvent *e) {
 431	unsigned int i, x, click;
 432	Arg arg = {0};
 433	Client *c;
 434	Monitor *m;
 435	XButtonPressedEvent *ev = &e->xbutton;
 436
 437	click = ClkRootWin;
 438	/* focus monitor if necessary */
 439	if((m = wintomon(ev->window)) && m != selmon) {
 440		unfocus(selmon->sel, True);
 441		selmon = m;
 442		focus(NULL);
 443	}
 444	if(ev->window == selmon->barwin) {
 445		i = x = 0;
 446		do
 447			x += TEXTW(tags[i]);
 448		while(ev->x >= x && ++i < LENGTH(tags));
 449		if(i < LENGTH(tags)) {
 450			click = ClkTagBar;
 451			arg.ui = 1 << i;
 452		}
 453		else if(ev->x < x + blw)
 454			click = ClkLtSymbol;
 455		else if(ev->x > selmon->ww - TEXTW(stext))
 456			click = ClkStatusText;
 457		else
 458			click = ClkWinTitle;
 459	}
 460	else if((c = wintoclient(ev->window))) {
 461		focus(c);
 462		click = ClkClientWin;
 463	}
 464	for(i = 0; i < LENGTH(buttons); i++)
 465		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 466		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 467			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 468}
 469
 470void
 471checkotherwm(void) {
 472	xerrorxlib = XSetErrorHandler(xerrorstart);
 473	/* this causes an error if some other window manager is running */
 474	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 475	XSync(dpy, False);
 476	XSetErrorHandler(xerror);
 477	XSync(dpy, False);
 478}
 479
 480void
 481cleanup(void) {
 482	Arg a = {.ui = ~0};
 483	Layout foo = { "", NULL };
 484	Monitor *m;
 485
 486	view(&a);
 487	selmon->lt[selmon->sellt] = &foo;
 488	for(m = mons; m; m = m->next)
 489		while(m->stack)
 490			unmanage(m->stack, False);
 491	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 492	XFreePixmap(dpy, dc.drawable);
 493	XFreeGC(dpy, dc.gc);
 494	XFreeCursor(dpy, cursor[CurNormal]);
 495	XFreeCursor(dpy, cursor[CurResize]);
 496	XFreeCursor(dpy, cursor[CurMove]);
 497	while(mons)
 498		cleanupmon(mons);
 499	XSync(dpy, False);
 500	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 501	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 502}
 503
 504void
 505cleanupmon(Monitor *mon) {
 506	Monitor *m;
 507
 508	if(mon == mons)
 509		mons = mons->next;
 510	else {
 511		for(m = mons; m && m->next != mon; m = m->next);
 512		m->next = mon->next;
 513	}
 514	XUnmapWindow(dpy, mon->barwin);
 515	XDestroyWindow(dpy, mon->barwin);
 516	free(mon);
 517}
 518
 519void
 520clearurgent(Client *c) {
 521	XWMHints *wmh;
 522
 523	c->isurgent = False;
 524	if(!(wmh = XGetWMHints(dpy, c->win)))
 525		return;
 526	wmh->flags &= ~XUrgencyHint;
 527	XSetWMHints(dpy, c->win, wmh);
 528	XFree(wmh);
 529}
 530
 531void
 532clientmessage(XEvent *e) {
 533	XClientMessageEvent *cme = &e->xclient;
 534	Client *c = wintoclient(cme->window);
 535
 536	if(!c)
 537		return;
 538	if(cme->message_type == netatom[NetWMState]) {
 539		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 540			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 541			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 542	}
 543	else if(cme->message_type == netatom[NetActiveWindow]) {
 544		if(!ISVISIBLE(c)) {
 545			c->mon->seltags ^= 1;
 546			c->mon->tagset[c->mon->seltags] = c->tags;
 547		}
 548		pop(c);
 549	}
 550}
 551
 552void
 553configure(Client *c) {
 554	XConfigureEvent ce;
 555
 556	ce.type = ConfigureNotify;
 557	ce.display = dpy;
 558	ce.event = c->win;
 559	ce.window = c->win;
 560	ce.x = c->x;
 561	ce.y = c->y;
 562	ce.width = c->w;
 563	ce.height = c->h;
 564	ce.border_width = c->bw;
 565	ce.above = None;
 566	ce.override_redirect = False;
 567	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 568}
 569
 570void
 571configurenotify(XEvent *e) {
 572	Monitor *m;
 573	XConfigureEvent *ev = &e->xconfigure;
 574	Bool dirty;
 575
 576	// TODO: updategeom handling sucks, needs to be simplified
 577	if(ev->window == root) {
 578		dirty = (sw != ev->width || sh != ev->height);
 579		sw = ev->width;
 580		sh = ev->height;
 581		if(updategeom() || dirty) {
 582			if(dc.drawable != 0)
 583				XFreePixmap(dpy, dc.drawable);
 584			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 585			updatebars();
 586			for(m = mons; m; m = m->next)
 587				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 588			focus(NULL);
 589			arrange(NULL);
 590		}
 591	}
 592}
 593
 594void
 595configurerequest(XEvent *e) {
 596	Client *c;
 597	Monitor *m;
 598	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 599	XWindowChanges wc;
 600
 601	if((c = wintoclient(ev->window))) {
 602		if(ev->value_mask & CWBorderWidth)
 603			c->bw = ev->border_width;
 604		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 605			m = c->mon;
 606			if(ev->value_mask & CWX) {
 607				c->oldx = c->x;
 608				c->x = m->mx + ev->x;
 609			}
 610			if(ev->value_mask & CWY) {
 611				c->oldy = c->y;
 612				c->y = m->my + ev->y;
 613			}
 614			if(ev->value_mask & CWWidth) {
 615				c->oldw = c->w;
 616				c->w = ev->width;
 617			}
 618			if(ev->value_mask & CWHeight) {
 619				c->oldh = c->h;
 620				c->h = ev->height;
 621			}
 622			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 623				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 624			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 625				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 626			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 627				configure(c);
 628			if(ISVISIBLE(c))
 629				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 630		}
 631		else
 632			configure(c);
 633	}
 634	else {
 635		wc.x = ev->x;
 636		wc.y = ev->y;
 637		wc.width = ev->width;
 638		wc.height = ev->height;
 639		wc.border_width = ev->border_width;
 640		wc.sibling = ev->above;
 641		wc.stack_mode = ev->detail;
 642		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 643	}
 644	XSync(dpy, False);
 645}
 646
 647Monitor *
 648createmon(void) {
 649	Monitor *m;
 650
 651	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 652		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 653	m->tagset[0] = m->tagset[1] = 1;
 654	m->mfact = mfact;
 655	m->nmaster = nmaster;
 656	m->showbar = showbar;
 657	m->topbar = topbar;
 658	m->lt[0] = &layouts[0];
 659	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 660	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 661	return m;
 662}
 663
 664void
 665destroynotify(XEvent *e) {
 666	Client *c;
 667	XDestroyWindowEvent *ev = &e->xdestroywindow;
 668
 669	if((c = wintoclient(ev->window)))
 670		unmanage(c, True);
 671}
 672
 673void
 674detach(Client *c) {
 675	Client **tc;
 676
 677	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 678	*tc = c->next;
 679}
 680
 681void
 682detachstack(Client *c) {
 683	Client **tc, *t;
 684
 685	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 686	*tc = c->snext;
 687
 688	if(c == c->mon->sel) {
 689		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 690		c->mon->sel = t;
 691	}
 692}
 693
 694void
 695die(const char *errstr, ...) {
 696	va_list ap;
 697
 698	va_start(ap, errstr);
 699	vfprintf(stderr, errstr, ap);
 700	va_end(ap);
 701	exit(EXIT_FAILURE);
 702}
 703
 704Monitor *
 705dirtomon(int dir) {
 706	Monitor *m = NULL;
 707
 708	if(dir > 0) {
 709		if(!(m = selmon->next))
 710			m = mons;
 711	}
 712	else if(selmon == mons)
 713		for(m = mons; m->next; m = m->next);
 714	else
 715		for(m = mons; m->next != selmon; m = m->next);
 716	return m;
 717}
 718
 719void
 720drawbar(Monitor *m) {
 721	int x;
 722	unsigned int i, occ = 0, urg = 0;
 723	XftColor *col;
 724	Client *c;
 725
 726	for(c = m->clients; c; c = c->next) {
 727		occ |= c->tags;
 728		if(c->isurgent)
 729			urg |= c->tags;
 730	}
 731	dc.x = 0;
 732	for(i = 0; i < LENGTH(tags); i++) {
 733		dc.w = TEXTW(tags[i]);
 734		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 735		drawtext(tags[i], col, urg & 1 << i);
 736		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 737		           occ & 1 << i, urg & 1 << i, col);
 738		dc.x += dc.w;
 739	}
 740	dc.w = blw = TEXTW(m->ltsymbol);
 741	drawtext(m->ltsymbol, dc.norm, False);
 742	dc.x += dc.w;
 743	x = dc.x;
 744	if(m == selmon) { /* status is only drawn on selected monitor */
 745		dc.w = TEXTW(stext);
 746		dc.x = m->ww - dc.w;
 747		if(dc.x < x) {
 748			dc.x = x;
 749			dc.w = m->ww - x;
 750		}
 751		drawtext(stext, dc.norm, False);
 752	}
 753	else
 754		dc.x = m->ww;
 755	if((dc.w = dc.x - x) > bh) {
 756		dc.x = x;
 757		if(m->sel) {
 758			col = m == selmon ? dc.sel : dc.norm;
 759			drawtext(m->sel->name, col, False);
 760			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 761		}
 762		else
 763			drawtext(NULL, dc.norm, False);
 764	}
 765	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 766	XSync(dpy, False);
 767}
 768
 769void
 770drawbars(void) {
 771	Monitor *m;
 772
 773	for(m = mons; m; m = m->next)
 774		drawbar(m);
 775}
 776
 777void
 778drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]) {
 779	int x;
 780
 781	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG].pixel);
 782	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 783	if(filled)
 784		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 785	else if(empty)
 786		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 787}
 788
 789void
 790drawtext(const char *text, XftColor col[ColLast], Bool invert) {
 791	char buf[256];
 792	int i, x, y, h, len, olen;
 793	XftDraw *d;
 794
 795	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG].pixel);
 796	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 797	if(!text)
 798		return;
 799	olen = strlen(text);
 800	h = dc.font.ascent + dc.font.descent;
 801	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 802	x = dc.x + (h / 2);
 803	/* shorten text if necessary */
 804	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 805	if(!len)
 806		return;
 807	memcpy(buf, text, len);
 808	if(len < olen)
 809		for(i = len; i && i > len - 3; buf[--i] = '.');
 810
 811	d = XftDrawCreate(dpy, dc.drawable, DefaultVisual(dpy, screen), DefaultColormap(dpy,screen));
 812
 813	XftDrawStringUtf8(d, &col[invert ? ColBG : ColFG], dc.font.xfont, x, y, (XftChar8 *) buf, len);
 814	XftDrawDestroy(d);
 815}
 816
 817void
 818enternotify(XEvent *e) {
 819	Client *c;
 820	Monitor *m;
 821	XCrossingEvent *ev = &e->xcrossing;
 822
 823	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 824		return;
 825	c = wintoclient(ev->window);
 826	m = c ? c->mon : wintomon(ev->window);
 827	if(m != selmon) {
 828		unfocus(selmon->sel, True);
 829		selmon = m;
 830	}
 831	else if(!c || c == selmon->sel)
 832		return;
 833	focus(c);
 834}
 835
 836void
 837expose(XEvent *e) {
 838	Monitor *m;
 839	XExposeEvent *ev = &e->xexpose;
 840
 841	if(ev->count == 0 && (m = wintomon(ev->window)))
 842		drawbar(m);
 843}
 844
 845void
 846focus(Client *c) {
 847	if(!c || !ISVISIBLE(c))
 848		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 849	/* was if(selmon->sel) */
 850	if(selmon->sel && selmon->sel != c)
 851		unfocus(selmon->sel, False);
 852	if(c) {
 853		if(c->mon != selmon)
 854			selmon = c->mon;
 855		if(c->isurgent)
 856			clearurgent(c);
 857		detachstack(c);
 858		attachstack(c);
 859		grabbuttons(c, True);
 860		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder].pixel);
 861		setfocus(c);
 862	}
 863	else {
 864		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 865		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 866	}
 867	selmon->sel = c;
 868	drawbars();
 869}
 870
 871void
 872focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 873	XFocusChangeEvent *ev = &e->xfocus;
 874
 875	if(selmon->sel && ev->window != selmon->sel->win)
 876		setfocus(selmon->sel);
 877}
 878
 879void
 880focusmon(const Arg *arg) {
 881	Monitor *m;
 882
 883	if(!mons->next)
 884		return;
 885	if((m = dirtomon(arg->i)) == selmon)
 886		return;
 887	unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 888					in gedit and anjuta */
 889	selmon = m;
 890	focus(NULL);
 891}
 892
 893void
 894focusstack(const Arg *arg) {
 895	Client *c = NULL, *i;
 896
 897	if(!selmon->sel)
 898		return;
 899	if(arg->i > 0) {
 900		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 901		if(!c)
 902			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 903	}
 904	else {
 905		for(i = selmon->clients; i != selmon->sel; i = i->next)
 906			if(ISVISIBLE(i))
 907				c = i;
 908		if(!c)
 909			for(; i; i = i->next)
 910				if(ISVISIBLE(i))
 911					c = i;
 912	}
 913	if(c) {
 914		focus(c);
 915		restack(selmon);
 916	}
 917}
 918
 919Atom
 920getatomprop(Client *c, Atom prop) {
 921	int di;
 922	unsigned long dl;
 923	unsigned char *p = NULL;
 924	Atom da, atom = None;
 925
 926	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 927	                      &da, &di, &dl, &dl, &p) == Success && p) {
 928		atom = *(Atom *)p;
 929		XFree(p);
 930	}
 931	return atom;
 932}
 933
 934XftColor 
 935getcolor(const char *colstr) {
 936	XftColor color;
 937
 938	if(!XftColorAllocName(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), colstr, &color))
 939		die("error, cannot allocate color '%s'\n", colstr);
 940
 941	return color;
 942}
 943
 944Bool
 945getrootptr(int *x, int *y) {
 946	int di;
 947	unsigned int dui;
 948	Window dummy;
 949
 950	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 951}
 952
 953long
 954getstate(Window w) {
 955	int format;
 956	long result = -1;
 957	unsigned char *p = NULL;
 958	unsigned long n, extra;
 959	Atom real;
 960
 961	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 962	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 963		return -1;
 964	if(n != 0)
 965		result = *p;
 966	XFree(p);
 967	return result;
 968}
 969
 970Bool
 971gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 972	char **list = NULL;
 973	int n;
 974	XTextProperty name;
 975
 976	if(!text || size == 0)
 977		return False;
 978	text[0] = '\0';
 979	XGetTextProperty(dpy, w, &name, atom);
 980	if(!name.nitems)
 981		return False;
 982	if(name.encoding == XA_STRING)
 983		strncpy(text, (char *)name.value, size - 1);
 984	else {
 985		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 986			strncpy(text, *list, size - 1);
 987			XFreeStringList(list);
 988		}
 989	}
 990	text[size - 1] = '\0';
 991	XFree(name.value);
 992	return True;
 993}
 994
 995void
 996grabbuttons(Client *c, Bool focused) {
 997	updatenumlockmask();
 998	{
 999		unsigned int i, j;
1000		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1001		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1002		if(focused) {
1003			for(i = 0; i < LENGTH(buttons); i++)
1004				if(buttons[i].click == ClkClientWin)
1005					for(j = 0; j < LENGTH(modifiers); j++)
1006						XGrabButton(dpy, buttons[i].button,
1007						            buttons[i].mask | modifiers[j],
1008						            c->win, False, BUTTONMASK,
1009						            GrabModeAsync, GrabModeSync, None, None);
1010		}
1011		else
1012			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1013			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1014	}
1015}
1016
1017void
1018grabkeys(void) {
1019	updatenumlockmask();
1020	{
1021		unsigned int i, j;
1022		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1023		KeyCode code;
1024
1025		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1026		for(i = 0; i < LENGTH(keys); i++)
1027			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1028				for(j = 0; j < LENGTH(modifiers); j++)
1029					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1030						 True, GrabModeAsync, GrabModeAsync);
1031	}
1032}
1033
1034void
1035incnmaster(const Arg *arg) {
1036	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1037	arrange(selmon);
1038}
1039
1040void
1041initfont(const char *fontstr) {
1042
1043	if(!(dc.font.xfont = XftFontOpenName(dpy,screen,fontstr))
1044	&& !(dc.font.xfont = XftFontOpenName(dpy,screen,"fixed")))
1045		die("error, cannot load font: '%s'\n", fontstr);
1046
1047	dc.font.ascent = dc.font.xfont->ascent;
1048	dc.font.descent = dc.font.xfont->descent;
1049	dc.font.height = dc.font.ascent + dc.font.descent;
1050}
1051
1052#ifdef XINERAMA
1053static Bool
1054isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1055	while(n--)
1056		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1057		&& unique[n].width == info->width && unique[n].height == info->height)
1058			return False;
1059	return True;
1060}
1061#endif /* XINERAMA */
1062
1063void
1064keypress(XEvent *e) {
1065	unsigned int i;
1066	KeySym keysym;
1067	XKeyEvent *ev;
1068
1069	ev = &e->xkey;
1070	keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1071	for(i = 0; i < LENGTH(keys); i++)
1072		if(keysym == keys[i].keysym
1073		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1074		&& keys[i].func)
1075			keys[i].func(&(keys[i].arg));
1076}
1077
1078void
1079killclient(const Arg *arg) {
1080	if(!selmon->sel)
1081		return;
1082	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1083		XGrabServer(dpy);
1084		XSetErrorHandler(xerrordummy);
1085		XSetCloseDownMode(dpy, DestroyAll);
1086		XKillClient(dpy, selmon->sel->win);
1087		XSync(dpy, False);
1088		XSetErrorHandler(xerror);
1089		XUngrabServer(dpy);
1090	}
1091}
1092
1093void
1094manage(Window w, XWindowAttributes *wa) {
1095	Client *c, *t = NULL;
1096	Window trans = None;
1097	XWindowChanges wc;
1098
1099	if(!(c = calloc(1, sizeof(Client))))
1100		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1101	c->win = w;
1102	updatetitle(c);
1103	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1104		c->mon = t->mon;
1105		c->tags = t->tags;
1106	}
1107	else {
1108		c->mon = selmon;
1109		applyrules(c);
1110	}
1111	/* geometry */
1112	c->x = c->oldx = wa->x;
1113	c->y = c->oldy = wa->y;
1114	c->w = c->oldw = wa->width;
1115	c->h = c->oldh = wa->height;
1116	c->oldbw = wa->border_width;
1117
1118	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1119		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1120	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1121		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1122	c->x = MAX(c->x, c->mon->mx);
1123	/* only fix client y-offset, if the client center might cover the bar */
1124	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1125	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1126	c->bw = borderpx;
1127
1128	wc.border_width = c->bw;
1129	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1130	XSetWindowBorder(dpy, w, dc.norm[ColBorder].pixel);
1131	configure(c); /* propagates border_width, if size doesn't change */
1132	updatewindowtype(c);
1133	updatesizehints(c);
1134	updatewmhints(c);
1135	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1136	grabbuttons(c, False);
1137	if(!c->isfloating)
1138		c->isfloating = c->oldstate = trans != None || c->isfixed;
1139	if(c->isfloating)
1140		XRaiseWindow(dpy, c->win);
1141	attach(c);
1142	attachstack(c);
1143	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1144	                (unsigned char *) &(c->win), 1);
1145	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1146	setclientstate(c, NormalState);
1147	if (c->mon == selmon)
1148		unfocus(selmon->sel, False);
1149	c->mon->sel = c;
1150	arrange(c->mon);
1151	XMapWindow(dpy, c->win);
1152	focus(NULL);
1153}
1154
1155void
1156mappingnotify(XEvent *e) {
1157	XMappingEvent *ev = &e->xmapping;
1158
1159	XRefreshKeyboardMapping(ev);
1160	if(ev->request == MappingKeyboard)
1161		grabkeys();
1162}
1163
1164void
1165maprequest(XEvent *e) {
1166	static XWindowAttributes wa;
1167	XMapRequestEvent *ev = &e->xmaprequest;
1168
1169	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1170		return;
1171	if(wa.override_redirect)
1172		return;
1173	if(!wintoclient(ev->window))
1174		manage(ev->window, &wa);
1175}
1176
1177void
1178monocle(Monitor *m) {
1179	unsigned int n = 0;
1180	Client *c;
1181
1182	for(c = m->clients; c; c = c->next)
1183		if(ISVISIBLE(c))
1184			n++;
1185	if(n > 0) /* override layout symbol */
1186		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1187	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1188		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1189}
1190
1191void
1192motionnotify(XEvent *e) {
1193	static Monitor *mon = NULL;
1194	Monitor *m;
1195	XMotionEvent *ev = &e->xmotion;
1196
1197	if(ev->window != root)
1198		return;
1199	if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1200		unfocus(selmon->sel, True);
1201		selmon = m;
1202		focus(NULL);
1203	}
1204	mon = m;
1205}
1206
1207void
1208movemouse(const Arg *arg) {
1209	int x, y, ocx, ocy, nx, ny;
1210	Client *c;
1211	Monitor *m;
1212	XEvent ev;
1213
1214	if(!(c = selmon->sel))
1215		return;
1216	if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1217		return;
1218	restack(selmon);
1219	ocx = c->x;
1220	ocy = c->y;
1221	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1222	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1223		return;
1224	if(!getrootptr(&x, &y))
1225		return;
1226	do {
1227		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1228		switch(ev.type) {
1229		case ConfigureRequest:
1230		case Expose:
1231		case MapRequest:
1232			handler[ev.type](&ev);
1233			break;
1234		case MotionNotify:
1235			nx = ocx + (ev.xmotion.x - x);
1236			ny = ocy + (ev.xmotion.y - y);
1237			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1238			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1239				if(abs(selmon->wx - nx) < snap)
1240					nx = selmon->wx;
1241				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1242					nx = selmon->wx + selmon->ww - WIDTH(c);
1243				if(abs(selmon->wy - ny) < snap)
1244					ny = selmon->wy;
1245				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1246					ny = selmon->wy + selmon->wh - HEIGHT(c);
1247				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1248				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1249					togglefloating(NULL);
1250			}
1251			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1252				resize(c, nx, ny, c->w, c->h, True);
1253			break;
1254		}
1255	} while(ev.type != ButtonRelease);
1256	XUngrabPointer(dpy, CurrentTime);
1257	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1258		sendmon(c, m);
1259		selmon = m;
1260		focus(NULL);
1261	}
1262}
1263
1264Client *
1265nexttiled(Client *c) {
1266	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1267	return c;
1268}
1269
1270void
1271pop(Client *c) {
1272	detach(c);
1273	attach(c);
1274	focus(c);
1275	arrange(c->mon);
1276}
1277
1278void
1279propertynotify(XEvent *e) {
1280	Client *c;
1281	Window trans;
1282	XPropertyEvent *ev = &e->xproperty;
1283
1284	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1285		updatestatus();
1286	else if(ev->state == PropertyDelete)
1287		return; /* ignore */
1288	else if((c = wintoclient(ev->window))) {
1289		switch(ev->atom) {
1290		default: break;
1291		case XA_WM_TRANSIENT_FOR:
1292			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1293			   (c->isfloating = (wintoclient(trans)) != NULL))
1294				arrange(c->mon);
1295			break;
1296		case XA_WM_NORMAL_HINTS:
1297			updatesizehints(c);
1298			break;
1299		case XA_WM_HINTS:
1300			updatewmhints(c);
1301			drawbars();
1302			break;
1303		}
1304		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1305			updatetitle(c);
1306			if(c == c->mon->sel)
1307				drawbar(c->mon);
1308		}
1309		if(ev->atom == netatom[NetWMWindowType])
1310			updatewindowtype(c);
1311	}
1312}
1313
1314void
1315quit(const Arg *arg) {
1316	running = False;
1317}
1318
1319Monitor *
1320recttomon(int x, int y, int w, int h) {
1321	Monitor *m, *r = selmon;
1322	int a, area = 0;
1323
1324	for(m = mons; m; m = m->next)
1325		if((a = INTERSECT(x, y, w, h, m)) > area) {
1326			area = a;
1327			r = m;
1328		}
1329	return r;
1330}
1331
1332void
1333resize(Client *c, int x, int y, int w, int h, Bool interact) {
1334	if(applysizehints(c, &x, &y, &w, &h, interact))
1335		resizeclient(c, x, y, w, h);
1336}
1337
1338void
1339resizeclient(Client *c, int x, int y, int w, int h) {
1340	XWindowChanges wc;
1341
1342	c->oldx = c->x; c->x = wc.x = x;
1343	c->oldy = c->y; c->y = wc.y = y;
1344	c->oldw = c->w; c->w = wc.width = w;
1345	c->oldh = c->h; c->h = wc.height = h;
1346	wc.border_width = c->bw;
1347	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1348	configure(c);
1349	XSync(dpy, False);
1350}
1351
1352void
1353resizemouse(const Arg *arg) {
1354	int ocx, ocy;
1355	int nw, nh;
1356	Client *c;
1357	Monitor *m;
1358	XEvent ev;
1359
1360	if(!(c = selmon->sel))
1361		return;
1362	if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1363		return;
1364	restack(selmon);
1365	ocx = c->x;
1366	ocy = c->y;
1367	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1368	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1369		return;
1370	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1371	do {
1372		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1373		switch(ev.type) {
1374		case ConfigureRequest:
1375		case Expose:
1376		case MapRequest:
1377			handler[ev.type](&ev);
1378			break;
1379		case MotionNotify:
1380			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1381			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1382			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1383			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1384			{
1385				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1386				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1387					togglefloating(NULL);
1388			}
1389			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1390				resize(c, c->x, c->y, nw, nh, True);
1391			break;
1392		}
1393	} while(ev.type != ButtonRelease);
1394	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1395	XUngrabPointer(dpy, CurrentTime);
1396	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1397	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1398		sendmon(c, m);
1399		selmon = m;
1400		focus(NULL);
1401	}
1402}
1403
1404void
1405restack(Monitor *m) {
1406	Client *c;
1407	XEvent ev;
1408	XWindowChanges wc;
1409
1410	drawbar(m);
1411	if(!m->sel)
1412		return;
1413	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1414		XRaiseWindow(dpy, m->sel->win);
1415	if(m->lt[m->sellt]->arrange) {
1416		wc.stack_mode = Below;
1417		wc.sibling = m->barwin;
1418		for(c = m->stack; c; c = c->snext)
1419			if(!c->isfloating && ISVISIBLE(c)) {
1420				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1421				wc.sibling = c->win;
1422			}
1423	}
1424	XSync(dpy, False);
1425	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1426}
1427
1428void
1429run(void) {
1430	XEvent ev;
1431	/* main event loop */
1432	XSync(dpy, False);
1433	while(running && !XNextEvent(dpy, &ev))
1434		if(handler[ev.type])
1435			handler[ev.type](&ev); /* call handler */
1436}
1437
1438void
1439scan(void) {
1440	unsigned int i, num;
1441	Window d1, d2, *wins = NULL;
1442	XWindowAttributes wa;
1443
1444	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1445		for(i = 0; i < num; i++) {
1446			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1447			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1448				continue;
1449			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1450				manage(wins[i], &wa);
1451		}
1452		for(i = 0; i < num; i++) { /* now the transients */
1453			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1454				continue;
1455			if(XGetTransientForHint(dpy, wins[i], &d1)
1456			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1457				manage(wins[i], &wa);
1458		}
1459		if(wins)
1460			XFree(wins);
1461	}
1462}
1463
1464void
1465sendmon(Client *c, Monitor *m) {
1466	if(c->mon == m)
1467		return;
1468	unfocus(c, True);
1469	detach(c);
1470	detachstack(c);
1471	c->mon = m;
1472	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1473	attach(c);
1474	attachstack(c);
1475	focus(NULL);
1476	arrange(NULL);
1477}
1478
1479void
1480setclientstate(Client *c, long state) {
1481	long data[] = { state, None };
1482
1483	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1484			PropModeReplace, (unsigned char *)data, 2);
1485}
1486
1487Bool
1488sendevent(Client *c, Atom proto) {
1489	int n;
1490	Atom *protocols;
1491	Bool exists = False;
1492	XEvent ev;
1493
1494	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1495		while(!exists && n--)
1496			exists = protocols[n] == proto;
1497		XFree(protocols);
1498	}
1499	if(exists) {
1500		ev.type = ClientMessage;
1501		ev.xclient.window = c->win;
1502		ev.xclient.message_type = wmatom[WMProtocols];
1503		ev.xclient.format = 32;
1504		ev.xclient.data.l[0] = proto;
1505		ev.xclient.data.l[1] = CurrentTime;
1506		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1507	}
1508	return exists;
1509}
1510
1511void
1512setfocus(Client *c) {
1513	if(!c->neverfocus) {
1514		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1515		XChangeProperty(dpy, root, netatom[NetActiveWindow],
1516 		                XA_WINDOW, 32, PropModeReplace,
1517 		                (unsigned char *) &(c->win), 1);
1518	}
1519	sendevent(c, wmatom[WMTakeFocus]);
1520}
1521
1522void
1523setfullscreen(Client *c, Bool fullscreen) {
1524	if(fullscreen) {
1525		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1526		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1527		c->isfullscreen = True;
1528		c->oldstate = c->isfloating;
1529		c->oldbw = c->bw;
1530		c->bw = 0;
1531		c->isfloating = True;
1532		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1533		XRaiseWindow(dpy, c->win);
1534	}
1535	else {
1536		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1537		                PropModeReplace, (unsigned char*)0, 0);
1538		c->isfullscreen = False;
1539		c->isfloating = c->oldstate;
1540		c->bw = c->oldbw;
1541		c->x = c->oldx;
1542		c->y = c->oldy;
1543		c->w = c->oldw;
1544		c->h = c->oldh;
1545		resizeclient(c, c->x, c->y, c->w, c->h);
1546		arrange(c->mon);
1547	}
1548}
1549
1550void
1551setlayout(const Arg *arg) {
1552	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1553		selmon->sellt ^= 1;
1554	if(arg && arg->v)
1555		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1556	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1557	if(selmon->sel)
1558		arrange(selmon);
1559	else
1560		drawbar(selmon);
1561}
1562
1563/* arg > 1.0 will set mfact absolutly */
1564void
1565setmfact(const Arg *arg) {
1566	float f;
1567
1568	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1569		return;
1570	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1571	if(f < 0.1 || f > 0.9)
1572		return;
1573	selmon->mfact = f;
1574	arrange(selmon);
1575}
1576
1577void
1578setup(void) {
1579	XSetWindowAttributes wa;
1580
1581	/* clean up any zombies immediately */
1582	sigchld(0);
1583
1584	/* init screen */
1585	screen = DefaultScreen(dpy);
1586	root = RootWindow(dpy, screen);
1587	initfont(font);
1588	sw = DisplayWidth(dpy, screen);
1589	sh = DisplayHeight(dpy, screen);
1590	bh = dc.h = dc.font.height + 2;
1591	updategeom();
1592	/* init atoms */
1593	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1594	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1595	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1596	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1597	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1598	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1599	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1600	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1601	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1602	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1603	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1604	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1605	/* init cursors */
1606	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1607	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1608	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1609	/* init appearance */
1610	dc.norm[ColBorder] = getcolor(normbordercolor);
1611	dc.norm[ColBG] = getcolor(normbgcolor);
1612	dc.norm[ColFG] = getcolor(normfgcolor);
1613	dc.sel[ColBorder] = getcolor(selbordercolor);
1614	dc.sel[ColBG] = getcolor(selbgcolor);
1615	dc.sel[ColFG] = getcolor(selfgcolor);
1616	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1617	dc.gc = XCreateGC(dpy, root, 0, NULL);
1618	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1619	/* init bars */
1620	updatebars();
1621	updatestatus();
1622	/* EWMH support per view */
1623	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1624			PropModeReplace, (unsigned char *) netatom, NetLast);
1625	XDeleteProperty(dpy, root, netatom[NetClientList]);
1626	/* select for events */
1627	wa.cursor = cursor[CurNormal];
1628	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1629	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1630	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1631	XSelectInput(dpy, root, wa.event_mask);
1632	grabkeys();
1633}
1634
1635void
1636showhide(Client *c) {
1637	if(!c)
1638		return;
1639	if(ISVISIBLE(c)) { /* show clients top down */
1640		XMoveWindow(dpy, c->win, c->x, c->y);
1641		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1642			resize(c, c->x, c->y, c->w, c->h, False);
1643		showhide(c->snext);
1644	}
1645	else { /* hide clients bottom up */
1646		showhide(c->snext);
1647		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1648	}
1649}
1650
1651void
1652sigchld(int unused) {
1653	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1654		die("Can't install SIGCHLD handler");
1655	while(0 < waitpid(-1, NULL, WNOHANG));
1656}
1657
1658void
1659spawn(const Arg *arg) {
1660	if(fork() == 0) {
1661		if(dpy)
1662			close(ConnectionNumber(dpy));
1663		setsid();
1664		execvp(((char **)arg->v)[0], (char **)arg->v);
1665		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1666		perror(" failed");
1667		exit(EXIT_SUCCESS);
1668	}
1669}
1670
1671void
1672tag(const Arg *arg) {
1673	if(selmon->sel && arg->ui & TAGMASK) {
1674		selmon->sel->tags = arg->ui & TAGMASK;
1675		focus(NULL);
1676		arrange(selmon);
1677	}
1678}
1679
1680void
1681tagmon(const Arg *arg) {
1682	if(!selmon->sel || !mons->next)
1683		return;
1684	sendmon(selmon->sel, dirtomon(arg->i));
1685}
1686
1687int
1688textnw(const char *text, unsigned int len) {
1689	XGlyphInfo ext;
1690	XftTextExtentsUtf8(dpy, dc.font.xfont, (XftChar8 *) text, len, &ext);
1691	return ext.xOff;
1692}
1693
1694void
1695tile(Monitor *m) {
1696	unsigned int i, n, h, mw, my, ty;
1697	Client *c;
1698
1699	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1700	if(n == 0)
1701		return;
1702
1703	if(n > m->nmaster)
1704		mw = m->nmaster ? m->ww * m->mfact : 0;
1705	else
1706		mw = m->ww;
1707	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1708		if(i < m->nmaster) {
1709			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1710			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1711			my += HEIGHT(c);
1712		}
1713		else {
1714			h = (m->wh - ty) / (n - i);
1715			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1716			ty += HEIGHT(c);
1717		}
1718}
1719
1720void
1721togglebar(const Arg *arg) {
1722	selmon->showbar = !selmon->showbar;
1723	updatebarpos(selmon);
1724	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1725	arrange(selmon);
1726}
1727
1728void
1729togglefloating(const Arg *arg) {
1730	if(!selmon->sel)
1731		return;
1732	if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1733		return;
1734	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1735	if(selmon->sel->isfloating)
1736		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1737		       selmon->sel->w, selmon->sel->h, False);
1738	arrange(selmon);
1739}
1740
1741void
1742toggletag(const Arg *arg) {
1743	unsigned int newtags;
1744
1745	if(!selmon->sel)
1746		return;
1747	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1748	if(newtags) {
1749		selmon->sel->tags = newtags;
1750		focus(NULL);
1751		arrange(selmon);
1752	}
1753}
1754
1755void
1756toggleview(const Arg *arg) {
1757	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1758
1759	if(newtagset) {
1760		selmon->tagset[selmon->seltags] = newtagset;
1761		focus(NULL);
1762		arrange(selmon);
1763	}
1764}
1765
1766void
1767unfocus(Client *c, Bool setfocus) {
1768	if(!c)
1769		return;
1770	grabbuttons(c, False);
1771	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder].pixel);
1772	if(setfocus) {
1773		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1774		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1775	}
1776}
1777
1778void
1779unmanage(Client *c, Bool destroyed) {
1780	Monitor *m = c->mon;
1781	XWindowChanges wc;
1782
1783	/* The server grab construct avoids race conditions. */
1784	detach(c);
1785	detachstack(c);
1786	if(!destroyed) {
1787		wc.border_width = c->oldbw;
1788		XGrabServer(dpy);
1789		XSetErrorHandler(xerrordummy);
1790		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1791		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1792		setclientstate(c, WithdrawnState);
1793		XSync(dpy, False);
1794		XSetErrorHandler(xerror);
1795		XUngrabServer(dpy);
1796	}
1797	free(c);
1798	focus(NULL);
1799	updateclientlist();
1800	arrange(m);
1801}
1802
1803void
1804unmapnotify(XEvent *e) {
1805	Client *c;
1806	XUnmapEvent *ev = &e->xunmap;
1807
1808	if((c = wintoclient(ev->window))) {
1809		if(ev->send_event)
1810			setclientstate(c, WithdrawnState);
1811		else
1812			unmanage(c, False);
1813	}
1814}
1815
1816void
1817updatebars(void) {
1818	Monitor *m;
1819	XSetWindowAttributes wa = {
1820		.override_redirect = True,
1821		.background_pixmap = ParentRelative,
1822		.event_mask = ButtonPressMask|ExposureMask
1823	};
1824	for(m = mons; m; m = m->next) {
1825		if (m->barwin)
1826			continue;
1827		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1828		                          CopyFromParent, DefaultVisual(dpy, screen),
1829		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1830		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1831		XMapRaised(dpy, m->barwin);
1832	}
1833}
1834
1835void
1836updatebarpos(Monitor *m) {
1837	m->wy = m->my;
1838	m->wh = m->mh;
1839	if(m->showbar) {
1840		m->wh -= bh;
1841		m->by = m->topbar ? m->wy : m->wy + m->wh;
1842		m->wy = m->topbar ? m->wy + bh : m->wy;
1843	}
1844	else
1845		m->by = -bh;
1846}
1847
1848void
1849updateclientlist() {
1850	Client *c;
1851	Monitor *m;
1852
1853	XDeleteProperty(dpy, root, netatom[NetClientList]);
1854	for(m = mons; m; m = m->next)
1855		for(c = m->clients; c; c = c->next)
1856			XChangeProperty(dpy, root, netatom[NetClientList],
1857			                XA_WINDOW, 32, PropModeAppend,
1858			                (unsigned char *) &(c->win), 1);
1859}
1860
1861Bool
1862updategeom(void) {
1863	Bool dirty = False;
1864
1865#ifdef XINERAMA
1866	if(XineramaIsActive(dpy)) {
1867		int i, j, n, nn;
1868		Client *c;
1869		Monitor *m;
1870		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1871		XineramaScreenInfo *unique = NULL;
1872
1873		for(n = 0, m = mons; m; m = m->next, n++);
1874		/* only consider unique geometries as separate screens */
1875		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1876			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1877		for(i = 0, j = 0; i < nn; i++)
1878			if(isuniquegeom(unique, j, &info[i]))
1879				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1880		XFree(info);
1881		nn = j;
1882		if(n <= nn) {
1883			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1884				for(m = mons; m && m->next; m = m->next);
1885				if(m)
1886					m->next = createmon();
1887				else
1888					mons = createmon();
1889			}
1890			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1891				if(i >= n
1892				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1893				    || unique[i].width != m->mw || unique[i].height != m->mh))
1894				{
1895					dirty = True;
1896					m->num = i;
1897					m->mx = m->wx = unique[i].x_org;
1898					m->my = m->wy = unique[i].y_org;
1899					m->mw = m->ww = unique[i].width;
1900					m->mh = m->wh = unique[i].height;
1901					updatebarpos(m);
1902				}
1903		}
1904		else { /* less monitors available nn < n */
1905			for(i = nn; i < n; i++) {
1906				for(m = mons; m && m->next; m = m->next);
1907				while(m->clients) {
1908					dirty = True;
1909					c = m->clients;
1910					m->clients = c->next;
1911					detachstack(c);
1912					c->mon = mons;
1913					attach(c);
1914					attachstack(c);
1915				}
1916				if(m == selmon)
1917					selmon = mons;
1918				cleanupmon(m);
1919			}
1920		}
1921		free(unique);
1922	}
1923	else
1924#endif /* XINERAMA */
1925	/* default monitor setup */
1926	{
1927		if(!mons)
1928			mons = createmon();
1929		if(mons->mw != sw || mons->mh != sh) {
1930			dirty = True;
1931			mons->mw = mons->ww = sw;
1932			mons->mh = mons->wh = sh;
1933			updatebarpos(mons);
1934		}
1935	}
1936	if(dirty) {
1937		selmon = mons;
1938		selmon = wintomon(root);
1939	}
1940	return dirty;
1941}
1942
1943void
1944updatenumlockmask(void) {
1945	unsigned int i, j;
1946	XModifierKeymap *modmap;
1947
1948	numlockmask = 0;
1949	modmap = XGetModifierMapping(dpy);
1950	for(i = 0; i < 8; i++)
1951		for(j = 0; j < modmap->max_keypermod; j++)
1952			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1953			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1954				numlockmask = (1 << i);
1955	XFreeModifiermap(modmap);
1956}
1957
1958void
1959updatesizehints(Client *c) {
1960	long msize;
1961	XSizeHints size;
1962
1963	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1964		/* size is uninitialized, ensure that size.flags aren't used */
1965		size.flags = PSize;
1966	if(size.flags & PBaseSize) {
1967		c->basew = size.base_width;
1968		c->baseh = size.base_height;
1969	}
1970	else if(size.flags & PMinSize) {
1971		c->basew = size.min_width;
1972		c->baseh = size.min_height;
1973	}
1974	else
1975		c->basew = c->baseh = 0;
1976	if(size.flags & PResizeInc) {
1977		c->incw = size.width_inc;
1978		c->inch = size.height_inc;
1979	}
1980	else
1981		c->incw = c->inch = 0;
1982	if(size.flags & PMaxSize) {
1983		c->maxw = size.max_width;
1984		c->maxh = size.max_height;
1985	}
1986	else
1987		c->maxw = c->maxh = 0;
1988	if(size.flags & PMinSize) {
1989		c->minw = size.min_width;
1990		c->minh = size.min_height;
1991	}
1992	else if(size.flags & PBaseSize) {
1993		c->minw = size.base_width;
1994		c->minh = size.base_height;
1995	}
1996	else
1997		c->minw = c->minh = 0;
1998	if(size.flags & PAspect) {
1999		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2000		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2001	}
2002	else
2003		c->maxa = c->mina = 0.0;
2004	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2005	             && c->maxw == c->minw && c->maxh == c->minh);
2006}
2007
2008void
2009updatetitle(Client *c) {
2010	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2011		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2012	if(c->name[0] == '\0') /* hack to mark broken clients */
2013		strcpy(c->name, broken);
2014}
2015
2016void
2017updatestatus(void) {
2018	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2019		strcpy(stext, "dwm-"VERSION);
2020	drawbar(selmon);
2021}
2022
2023void
2024updatewindowtype(Client *c) {
2025	Atom state = getatomprop(c, netatom[NetWMState]);
2026	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2027
2028	if(state == netatom[NetWMFullscreen])
2029		setfullscreen(c, True);
2030	if(wtype == netatom[NetWMWindowTypeDialog])
2031		c->isfloating = True;
2032}
2033
2034void
2035updatewmhints(Client *c) {
2036	XWMHints *wmh;
2037
2038	if((wmh = XGetWMHints(dpy, c->win))) {
2039		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2040			wmh->flags &= ~XUrgencyHint;
2041			XSetWMHints(dpy, c->win, wmh);
2042		}
2043		else
2044			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2045		if(wmh->flags & InputHint)
2046			c->neverfocus = !wmh->input;
2047		else
2048			c->neverfocus = False;
2049		XFree(wmh);
2050	}
2051}
2052
2053void
2054view(const Arg *arg) {
2055	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2056		return;
2057	selmon->seltags ^= 1; /* toggle sel tagset */
2058	if(arg->ui & TAGMASK)
2059		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2060	focus(NULL);
2061	arrange(selmon);
2062}
2063
2064Client *
2065wintoclient(Window w) {
2066	Client *c;
2067	Monitor *m;
2068
2069	for(m = mons; m; m = m->next)
2070		for(c = m->clients; c; c = c->next)
2071			if(c->win == w)
2072				return c;
2073	return NULL;
2074}
2075
2076Monitor *
2077wintomon(Window w) {
2078	int x, y;
2079	Client *c;
2080	Monitor *m;
2081
2082	if(w == root && getrootptr(&x, &y))
2083		return recttomon(x, y, 1, 1);
2084	for(m = mons; m; m = m->next)
2085		if(w == m->barwin)
2086			return m;
2087	if((c = wintoclient(w)))
2088		return c->mon;
2089	return selmon;
2090}
2091
2092/* There's no way to check accesses to destroyed windows, thus those cases are
2093 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2094 * default error handler, which may call exit.  */
2095int
2096xerror(Display *dpy, XErrorEvent *ee) {
2097	if(ee->error_code == BadWindow
2098	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2099	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2100	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2101	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2102	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2103	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2104	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2105	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2106		return 0;
2107	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2108			ee->request_code, ee->error_code);
2109	return xerrorxlib(dpy, ee); /* may call exit */
2110}
2111
2112int
2113xerrordummy(Display *dpy, XErrorEvent *ee) {
2114	return 0;
2115}
2116
2117/* Startup Error handler to check if another window manager
2118 * is already running. */
2119int
2120xerrorstart(Display *dpy, XErrorEvent *ee) {
2121	die("dwm: another window manager is already running\n");
2122	return -1;
2123}
2124
2125void
2126zoom(const Arg *arg) {
2127	Client *c = selmon->sel;
2128
2129	if(!selmon->lt[selmon->sellt]->arrange
2130	|| (selmon->sel && selmon->sel->isfloating))
2131		return;
2132	if(c == nexttiled(selmon->clients))
2133		if(!c || !(c = nexttiled(c->next)))
2134			return;
2135	pop(c);
2136}
2137
2138int
2139main(int argc, char *argv[]) {
2140	if(argc == 2 && !strcmp("-v", argv[1]))
2141		die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2142	else if(argc != 1)
2143		die("usage: dwm [-v]\n");
2144	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2145		fputs("warning: no locale support\n", stderr);
2146	if(!(dpy = XOpenDisplay(NULL)))
2147		die("dwm: cannot open display\n");
2148	checkotherwm();
2149	setup();
2150	scan();
2151	run();
2152	cleanup();
2153	XCloseDisplay(dpy);
2154	return EXIT_SUCCESS;
2155}