1/* See LICENSE file for copyright and license details.
   2 *
   3 * dynamic window manager is designed like any other X client as well. It is
   4 * driven through handling X events. In contrast to other X clients, a window
   5 * manager selects for SubstructureRedirectMask on the root window, to receive
   6 * events about window (dis-)appearance.  Only one X connection at a time is
   7 * allowed to select for this event mask.
   8 *
   9 * The event handlers of dwm are organized in an array which is accessed
  10 * whenever a new event has been fetched. This allows event dispatching
  11 * in O(1) time.
  12 *
  13 * Each child of the root window is called a client, except windows which have
  14 * set the override_redirect flag.  Clients are organized in a linked client
  15 * list on each monitor, the focus history is remembered through a stack list
  16 * on each monitor. Each client contains a bit array to indicate the tags of a
  17 * client.
  18 *
  19 * Keys and tagging rules are organized as arrays and defined in config.h.
  20 *
  21 * To understand everything else, start reading main().
  22 */
  23#include <errno.h>
  24#include <locale.h>
  25#include <stdarg.h>
  26#include <signal.h>
  27#include <stdio.h>
  28#include <stdlib.h>
  29#include <string.h>
  30#include <unistd.h>
  31#include <sys/types.h>
  32#include <sys/wait.h>
  33#include <X11/cursorfont.h>
  34#include <X11/keysym.h>
  35#include <X11/Xatom.h>
  36#include <X11/Xlib.h>
  37#include <X11/Xproto.h>
  38#include <X11/Xutil.h>
  39#ifdef XINERAMA
  40#include <X11/extensions/Xinerama.h>
  41#endif /* XINERAMA */
  42
  43/* macros */
  44#define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45#define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46#define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                               * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49#define LENGTH(X)               (sizeof X / sizeof X[0])
  50#define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51#define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52#define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53#define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54#define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55#define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56#define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58/* enums */
  59enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61enum { NetSupported, NetWMName, NetWMState,
  62       NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63       NetWMWindowTypeDialog, NetLast };     /* EWMH atoms */
  64enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66       ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68typedef union {
  69	int i;
  70	unsigned int ui;
  71	float f;
  72	const void *v;
  73} Arg;
  74
  75typedef struct {
  76	unsigned int click;
  77	unsigned int mask;
  78	unsigned int button;
  79	void (*func)(const Arg *arg);
  80	const Arg arg;
  81} Button;
  82
  83typedef struct Monitor Monitor;
  84typedef struct Client Client;
  85struct Client {
  86	char name[256];
  87	float mina, maxa;
  88	int x, y, w, h;
  89	int oldx, oldy, oldw, oldh;
  90	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91	int bw, oldbw;
  92	unsigned int tags;
  93	Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94	Client *next;
  95	Client *snext;
  96	Monitor *mon;
  97	Window win;
  98};
  99
 100typedef struct {
 101	int x, y, w, h;
 102	unsigned long norm[ColLast];
 103	unsigned long sel[ColLast];
 104	Drawable drawable;
 105	GC gc;
 106	struct {
 107		int ascent;
 108		int descent;
 109		int height;
 110		XFontSet set;
 111		XFontStruct *xfont;
 112	} font;
 113} DC; /* draw context */
 114
 115typedef struct {
 116	unsigned int mod;
 117	KeySym keysym;
 118	void (*func)(const Arg *);
 119	const Arg arg;
 120} Key;
 121
 122typedef struct {
 123	const char *symbol;
 124	void (*arrange)(Monitor *);
 125} Layout;
 126
 127struct Monitor {
 128	char ltsymbol[16];
 129	float mfact;
 130	int nmaster;
 131	int num;
 132	int by;               /* bar geometry */
 133	int mx, my, mw, mh;   /* screen size */
 134	int wx, wy, ww, wh;   /* window area  */
 135	unsigned int seltags;
 136	unsigned int sellt;
 137	unsigned int tagset[2];
 138	Bool showbar;
 139	Bool topbar;
 140	Client *clients;
 141	Client *sel;
 142	Client *stack;
 143	Monitor *next;
 144	Window barwin;
 145	const Layout *lt[2];
 146};
 147
 148typedef struct {
 149	const char *class;
 150	const char *instance;
 151	const char *title;
 152	unsigned int tags;
 153	Bool isfloating;
 154	int monitor;
 155} Rule;
 156
 157/* function declarations */
 158static void applyrules(Client *c);
 159static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160static void arrange(Monitor *m);
 161static void arrangemon(Monitor *m);
 162static void attach(Client *c);
 163static void attachstack(Client *c);
 164static void buttonpress(XEvent *e);
 165static void checkotherwm(void);
 166static void cleanup(void);
 167static void cleanupmon(Monitor *mon);
 168static void clearurgent(Client *c);
 169static void clientmessage(XEvent *e);
 170static void configure(Client *c);
 171static void configurenotify(XEvent *e);
 172static void configurerequest(XEvent *e);
 173static Monitor *createmon(void);
 174static void destroynotify(XEvent *e);
 175static void detach(Client *c);
 176static void detachstack(Client *c);
 177static void die(const char *errstr, ...);
 178static Monitor *dirtomon(int dir);
 179static void drawbar(Monitor *m);
 180static void drawbars(void);
 181static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183static void enternotify(XEvent *e);
 184static void expose(XEvent *e);
 185static void focus(Client *c);
 186static void focusin(XEvent *e);
 187static void focusmon(const Arg *arg);
 188static void focusstack(const Arg *arg);
 189static unsigned long getcolor(const char *colstr);
 190static Bool getrootptr(int *x, int *y);
 191static long getstate(Window w);
 192static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193static void grabbuttons(Client *c, Bool focused);
 194static void grabkeys(void);
 195static void incnmaster(const Arg *arg);
 196static void initfont(const char *fontstr);
 197static void keypress(XEvent *e);
 198static void killclient(const Arg *arg);
 199static void manage(Window w, XWindowAttributes *wa);
 200static void mappingnotify(XEvent *e);
 201static void maprequest(XEvent *e);
 202static void monocle(Monitor *m);
 203static void movemouse(const Arg *arg);
 204static Client *nexttiled(Client *c);
 205static void pop(Client *);
 206static void propertynotify(XEvent *e);
 207static void quit(const Arg *arg);
 208static Monitor *recttomon(int x, int y, int w, int h);
 209static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 210static void resizeclient(Client *c, int x, int y, int w, int h);
 211static void resizemouse(const Arg *arg);
 212static void restack(Monitor *m);
 213static void run(void);
 214static void scan(void);
 215static Bool sendevent(Client *c, Atom proto);
 216static void sendmon(Client *c, Monitor *m);
 217static void setclientstate(Client *c, long state);
 218static void setfocus(Client *c);
 219static void setfullscreen(Client *c, Bool fullscreen);
 220static void setlayout(const Arg *arg);
 221static void setmfact(const Arg *arg);
 222static void setup(void);
 223static void showhide(Client *c);
 224static void sigchld(int unused);
 225static void spawn(const Arg *arg);
 226static void tag(const Arg *arg);
 227static void tagmon(const Arg *arg);
 228static int textnw(const char *text, unsigned int len);
 229static void tile(Monitor *);
 230static void togglebar(const Arg *arg);
 231static void togglefloating(const Arg *arg);
 232static void toggletag(const Arg *arg);
 233static void toggleview(const Arg *arg);
 234static void unfocus(Client *c, Bool setfocus);
 235static void unmanage(Client *c, Bool destroyed);
 236static void unmapnotify(XEvent *e);
 237static Bool updategeom(void);
 238static void updatebarpos(Monitor *m);
 239static void updatebars(void);
 240static void updatenumlockmask(void);
 241static void updatesizehints(Client *c);
 242static void updatestatus(void);
 243static void updatewindowtype(Client *c);
 244static void updatetitle(Client *c);
 245static void updatewmhints(Client *c);
 246static void view(const Arg *arg);
 247static Client *wintoclient(Window w);
 248static Monitor *wintomon(Window w);
 249static int xerror(Display *dpy, XErrorEvent *ee);
 250static int xerrordummy(Display *dpy, XErrorEvent *ee);
 251static int xerrorstart(Display *dpy, XErrorEvent *ee);
 252static void zoom(const Arg *arg);
 253
 254/* variables */
 255static const char broken[] = "broken";
 256static char stext[256];
 257static int screen;
 258static int sw, sh;           /* X display screen geometry width, height */
 259static int bh, blw = 0;      /* bar geometry */
 260static int (*xerrorxlib)(Display *, XErrorEvent *);
 261static unsigned int numlockmask = 0;
 262static void (*handler[LASTEvent]) (XEvent *) = {
 263	[ButtonPress] = buttonpress,
 264	[ClientMessage] = clientmessage,
 265	[ConfigureRequest] = configurerequest,
 266	[ConfigureNotify] = configurenotify,
 267	[DestroyNotify] = destroynotify,
 268	[EnterNotify] = enternotify,
 269	[Expose] = expose,
 270	[FocusIn] = focusin,
 271	[KeyPress] = keypress,
 272	[MappingNotify] = mappingnotify,
 273	[MapRequest] = maprequest,
 274	[PropertyNotify] = propertynotify,
 275	[UnmapNotify] = unmapnotify
 276};
 277static Atom wmatom[WMLast], netatom[NetLast];
 278static Bool running = True;
 279static Cursor cursor[CurLast];
 280static Display *dpy;
 281static DC dc;
 282static Monitor *mons = NULL, *selmon = NULL;
 283static Window root;
 284
 285/* configuration, allows nested code to access above variables */
 286#include "config.h"
 287
 288/* compile-time check if all tags fit into an unsigned int bit array. */
 289struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 290
 291/* function implementations */
 292void
 293applyrules(Client *c) {
 294	const char *class, *instance;
 295	unsigned int i;
 296	const Rule *r;
 297	Monitor *m;
 298	XClassHint ch = { NULL, NULL };
 299
 300	/* rule matching */
 301	c->isfloating = c->tags = 0;
 302	XGetClassHint(dpy, c->win, &ch);
 303	class    = ch.res_class ? ch.res_class : broken;
 304	instance = ch.res_name  ? ch.res_name  : broken;
 305
 306	for(i = 0; i < LENGTH(rules); i++) {
 307		r = &rules[i];
 308		if((!r->title || strstr(c->name, r->title))
 309		&& (!r->class || strstr(class, r->class))
 310		&& (!r->instance || strstr(instance, r->instance)))
 311		{
 312			c->isfloating = r->isfloating;
 313			c->tags |= r->tags;
 314			for(m = mons; m && m->num != r->monitor; m = m->next);
 315			if(m)
 316				c->mon = m;
 317		}
 318	}
 319	if(ch.res_class)
 320		XFree(ch.res_class);
 321	if(ch.res_name)
 322		XFree(ch.res_name);
 323	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 324}
 325
 326Bool
 327applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 328	Bool baseismin;
 329	Monitor *m = c->mon;
 330
 331	/* set minimum possible */
 332	*w = MAX(1, *w);
 333	*h = MAX(1, *h);
 334	if(interact) {
 335		if(*x > sw)
 336			*x = sw - WIDTH(c);
 337		if(*y > sh)
 338			*y = sh - HEIGHT(c);
 339		if(*x + *w + 2 * c->bw < 0)
 340			*x = 0;
 341		if(*y + *h + 2 * c->bw < 0)
 342			*y = 0;
 343	}
 344	else {
 345		if(*x >= m->wx + m->ww)
 346			*x = m->wx + m->ww - WIDTH(c);
 347		if(*y >= m->wy + m->wh)
 348			*y = m->wy + m->wh - HEIGHT(c);
 349		if(*x + *w + 2 * c->bw <= m->wx)
 350			*x = m->wx;
 351		if(*y + *h + 2 * c->bw <= m->wy)
 352			*y = m->wy;
 353	}
 354	if(*h < bh)
 355		*h = bh;
 356	if(*w < bh)
 357		*w = bh;
 358	if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 359		/* see last two sentences in ICCCM 4.1.2.3 */
 360		baseismin = c->basew == c->minw && c->baseh == c->minh;
 361		if(!baseismin) { /* temporarily remove base dimensions */
 362			*w -= c->basew;
 363			*h -= c->baseh;
 364		}
 365		/* adjust for aspect limits */
 366		if(c->mina > 0 && c->maxa > 0) {
 367			if(c->maxa < (float)*w / *h)
 368				*w = *h * c->maxa + 0.5;
 369			else if(c->mina < (float)*h / *w)
 370				*h = *w * c->mina + 0.5;
 371		}
 372		if(baseismin) { /* increment calculation requires this */
 373			*w -= c->basew;
 374			*h -= c->baseh;
 375		}
 376		/* adjust for increment value */
 377		if(c->incw)
 378			*w -= *w % c->incw;
 379		if(c->inch)
 380			*h -= *h % c->inch;
 381		/* restore base dimensions */
 382		*w = MAX(*w + c->basew, c->minw);
 383		*h = MAX(*h + c->baseh, c->minh);
 384		if(c->maxw)
 385			*w = MIN(*w, c->maxw);
 386		if(c->maxh)
 387			*h = MIN(*h, c->maxh);
 388	}
 389	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 390}
 391
 392void
 393arrange(Monitor *m) {
 394	if(m)
 395		showhide(m->stack);
 396	else for(m = mons; m; m = m->next)
 397		showhide(m->stack);
 398	if(m)
 399		arrangemon(m);
 400	else for(m = mons; m; m = m->next)
 401		arrangemon(m);
 402}
 403
 404void
 405arrangemon(Monitor *m) {
 406	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 407	if(m->lt[m->sellt]->arrange)
 408		m->lt[m->sellt]->arrange(m);
 409	restack(m);
 410}
 411
 412void
 413attach(Client *c) {
 414	c->next = c->mon->clients;
 415	c->mon->clients = c;
 416}
 417
 418void
 419attachstack(Client *c) {
 420	c->snext = c->mon->stack;
 421	c->mon->stack = c;
 422}
 423
 424void
 425buttonpress(XEvent *e) {
 426	unsigned int i, x, click;
 427	Arg arg = {0};
 428	Client *c;
 429	Monitor *m;
 430	XButtonPressedEvent *ev = &e->xbutton;
 431
 432	click = ClkRootWin;
 433	/* focus monitor if necessary */
 434	if((m = wintomon(ev->window)) && m != selmon) {
 435		unfocus(selmon->sel, True);
 436		selmon = m;
 437		focus(NULL);
 438	}
 439	if(ev->window == selmon->barwin) {
 440		i = x = 0;
 441		do
 442			x += TEXTW(tags[i]);
 443		while(ev->x >= x && ++i < LENGTH(tags));
 444		if(i < LENGTH(tags)) {
 445			click = ClkTagBar;
 446			arg.ui = 1 << i;
 447		}
 448		else if(ev->x < x + blw)
 449			click = ClkLtSymbol;
 450		else if(ev->x > selmon->ww - TEXTW(stext))
 451			click = ClkStatusText;
 452		else
 453			click = ClkWinTitle;
 454	}
 455	else if((c = wintoclient(ev->window))) {
 456		focus(c);
 457		click = ClkClientWin;
 458	}
 459	for(i = 0; i < LENGTH(buttons); i++)
 460		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 461		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 462			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 463}
 464
 465void
 466checkotherwm(void) {
 467	xerrorxlib = XSetErrorHandler(xerrorstart);
 468	/* this causes an error if some other window manager is running */
 469	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 470	XSync(dpy, False);
 471	XSetErrorHandler(xerror);
 472	XSync(dpy, False);
 473}
 474
 475void
 476cleanup(void) {
 477	Arg a = {.ui = ~0};
 478	Layout foo = { "", NULL };
 479	Monitor *m;
 480
 481	view(&a);
 482	selmon->lt[selmon->sellt] = &foo;
 483	for(m = mons; m; m = m->next)
 484		while(m->stack)
 485			unmanage(m->stack, False);
 486	if(dc.font.set)
 487		XFreeFontSet(dpy, dc.font.set);
 488	else
 489		XFreeFont(dpy, dc.font.xfont);
 490	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 491	XFreePixmap(dpy, dc.drawable);
 492	XFreeGC(dpy, dc.gc);
 493	XFreeCursor(dpy, cursor[CurNormal]);
 494	XFreeCursor(dpy, cursor[CurResize]);
 495	XFreeCursor(dpy, cursor[CurMove]);
 496	while(mons)
 497		cleanupmon(mons);
 498	XSync(dpy, False);
 499	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 500}
 501
 502void
 503cleanupmon(Monitor *mon) {
 504	Monitor *m;
 505
 506	if(mon == mons)
 507		mons = mons->next;
 508	else {
 509		for(m = mons; m && m->next != mon; m = m->next);
 510		m->next = mon->next;
 511	}
 512	XUnmapWindow(dpy, mon->barwin);
 513	XDestroyWindow(dpy, mon->barwin);
 514	free(mon);
 515}
 516
 517void
 518clearurgent(Client *c) {
 519	XWMHints *wmh;
 520
 521	c->isurgent = False;
 522	if(!(wmh = XGetWMHints(dpy, c->win)))
 523		return;
 524	wmh->flags &= ~XUrgencyHint;
 525	XSetWMHints(dpy, c->win, wmh);
 526	XFree(wmh);
 527}
 528
 529void
 530clientmessage(XEvent *e) {
 531	XClientMessageEvent *cme = &e->xclient;
 532	Client *c = wintoclient(cme->window);
 533
 534	if(!c)
 535		return;
 536	if(cme->message_type == netatom[NetWMState]) {
 537		if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 538			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 539			              || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 540	}
 541	else if(cme->message_type == netatom[NetActiveWindow]) {
 542		if(!ISVISIBLE(c)) {
 543			c->mon->seltags ^= 1;
 544			c->mon->tagset[c->mon->seltags] = c->tags;
 545		}
 546		pop(c);
 547	}
 548}
 549
 550void
 551configure(Client *c) {
 552	XConfigureEvent ce;
 553
 554	ce.type = ConfigureNotify;
 555	ce.display = dpy;
 556	ce.event = c->win;
 557	ce.window = c->win;
 558	ce.x = c->x;
 559	ce.y = c->y;
 560	ce.width = c->w;
 561	ce.height = c->h;
 562	ce.border_width = c->bw;
 563	ce.above = None;
 564	ce.override_redirect = False;
 565	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 566}
 567
 568void
 569configurenotify(XEvent *e) {
 570	Monitor *m;
 571	XConfigureEvent *ev = &e->xconfigure;
 572	Bool dirty;
 573
 574	if(ev->window == root) {
 575		dirty = (sw != ev->width);
 576		sw = ev->width;
 577		sh = ev->height;
 578		if(updategeom() || dirty) {
 579			if(dc.drawable != 0)
 580				XFreePixmap(dpy, dc.drawable);
 581			dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 582			updatebars();
 583			for(m = mons; m; m = m->next)
 584				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 585			focus(NULL);
 586			arrange(NULL);
 587		}
 588	}
 589}
 590
 591void
 592configurerequest(XEvent *e) {
 593	Client *c;
 594	Monitor *m;
 595	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 596	XWindowChanges wc;
 597
 598	if((c = wintoclient(ev->window))) {
 599		if(ev->value_mask & CWBorderWidth)
 600			c->bw = ev->border_width;
 601		else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 602			m = c->mon;
 603			if(ev->value_mask & CWX) {
 604				c->oldx = c->x;
 605				c->x = m->mx + ev->x;
 606			}
 607			if(ev->value_mask & CWY) {
 608				c->oldy = c->y;
 609				c->y = m->my + ev->y;
 610			}
 611			if(ev->value_mask & CWWidth) {
 612				c->oldw = c->w;
 613				c->w = ev->width;
 614			}
 615			if(ev->value_mask & CWHeight) {
 616				c->oldh = c->h;
 617				c->h = ev->height;
 618			}
 619			if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 620				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 621			if((c->y + c->h) > m->my + m->mh && c->isfloating)
 622				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 623			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 624				configure(c);
 625			if(ISVISIBLE(c))
 626				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 627		}
 628		else
 629			configure(c);
 630	}
 631	else {
 632		wc.x = ev->x;
 633		wc.y = ev->y;
 634		wc.width = ev->width;
 635		wc.height = ev->height;
 636		wc.border_width = ev->border_width;
 637		wc.sibling = ev->above;
 638		wc.stack_mode = ev->detail;
 639		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 640	}
 641	XSync(dpy, False);
 642}
 643
 644Monitor *
 645createmon(void) {
 646	Monitor *m;
 647
 648	if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 649		die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 650	m->tagset[0] = m->tagset[1] = 1;
 651	m->mfact = mfact;
 652	m->nmaster = nmaster;
 653	m->showbar = showbar;
 654	m->topbar = topbar;
 655	m->lt[0] = &layouts[0];
 656	m->lt[1] = &layouts[1 % LENGTH(layouts)];
 657	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 658	return m;
 659}
 660
 661void
 662destroynotify(XEvent *e) {
 663	Client *c;
 664	XDestroyWindowEvent *ev = &e->xdestroywindow;
 665
 666	if((c = wintoclient(ev->window)))
 667		unmanage(c, True);
 668}
 669
 670void
 671detach(Client *c) {
 672	Client **tc;
 673
 674	for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 675	*tc = c->next;
 676}
 677
 678void
 679detachstack(Client *c) {
 680	Client **tc, *t;
 681
 682	for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 683	*tc = c->snext;
 684
 685	if(c == c->mon->sel) {
 686		for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 687		c->mon->sel = t;
 688	}
 689}
 690
 691void
 692die(const char *errstr, ...) {
 693	va_list ap;
 694
 695	va_start(ap, errstr);
 696	vfprintf(stderr, errstr, ap);
 697	va_end(ap);
 698	exit(EXIT_FAILURE);
 699}
 700
 701Monitor *
 702dirtomon(int dir) {
 703	Monitor *m = NULL;
 704
 705	if(dir > 0) {
 706		if(!(m = selmon->next))
 707			m = mons;
 708	}
 709	else if(selmon == mons)
 710		for(m = mons; m->next; m = m->next);
 711	else
 712		for(m = mons; m->next != selmon; m = m->next);
 713	return m;
 714}
 715
 716void
 717drawbar(Monitor *m) {
 718	int x;
 719	unsigned int i, occ = 0, urg = 0;
 720	unsigned long *col;
 721	Client *c;
 722
 723	for(c = m->clients; c; c = c->next) {
 724		occ |= c->tags;
 725		if(c->isurgent)
 726			urg |= c->tags;
 727	}
 728	dc.x = 0;
 729	for(i = 0; i < LENGTH(tags); i++) {
 730		dc.w = TEXTW(tags[i]);
 731		col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 732		drawtext(tags[i], col, urg & 1 << i);
 733		drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 734		           occ & 1 << i, urg & 1 << i, col);
 735		dc.x += dc.w;
 736	}
 737	dc.w = blw = TEXTW(m->ltsymbol);
 738	drawtext(m->ltsymbol, dc.norm, False);
 739	dc.x += dc.w;
 740	x = dc.x;
 741	if(m == selmon) { /* status is only drawn on selected monitor */
 742		dc.w = TEXTW(stext);
 743		dc.x = m->ww - dc.w;
 744		if(dc.x < x) {
 745			dc.x = x;
 746			dc.w = m->ww - x;
 747		}
 748		drawtext(stext, dc.norm, False);
 749	}
 750	else
 751		dc.x = m->ww;
 752	if((dc.w = dc.x - x) > bh) {
 753		dc.x = x;
 754		if(m->sel) {
 755			col = m == selmon ? dc.sel : dc.norm;
 756			drawtext(m->sel->name, col, False);
 757			drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 758		}
 759		else
 760			drawtext(NULL, dc.norm, False);
 761	}
 762	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 763	XSync(dpy, False);
 764}
 765
 766void
 767drawbars(void) {
 768	Monitor *m;
 769
 770	for(m = mons; m; m = m->next)
 771		drawbar(m);
 772}
 773
 774void
 775drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 776	int x;
 777
 778	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 779	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 780	if(filled)
 781		XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 782	else if(empty)
 783		XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 784}
 785
 786void
 787drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 788	char buf[256];
 789	int i, x, y, h, len, olen;
 790
 791	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 792	XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 793	if(!text)
 794		return;
 795	olen = strlen(text);
 796	h = dc.font.ascent + dc.font.descent;
 797	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 798	x = dc.x + (h / 2);
 799	/* shorten text if necessary */
 800	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 801	if(!len)
 802		return;
 803	memcpy(buf, text, len);
 804	if(len < olen)
 805		for(i = len; i && i > len - 3; buf[--i] = '.');
 806	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 807	if(dc.font.set)
 808		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 809	else
 810		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 811}
 812
 813void
 814enternotify(XEvent *e) {
 815	Client *c;
 816	Monitor *m;
 817	XCrossingEvent *ev = &e->xcrossing;
 818
 819	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 820		return;
 821	c = wintoclient(ev->window);
 822	m = c ? c->mon : wintomon(ev->window);
 823	if(m != selmon) {
 824		unfocus(selmon->sel, True);
 825		selmon = m;
 826	}
 827	else if(!c || c == selmon->sel)
 828		return;
 829	focus(c);
 830}
 831
 832void
 833expose(XEvent *e) {
 834	Monitor *m;
 835	XExposeEvent *ev = &e->xexpose;
 836
 837	if(ev->count == 0 && (m = wintomon(ev->window)))
 838		drawbar(m);
 839}
 840
 841void
 842focus(Client *c) {
 843	if(!c || !ISVISIBLE(c))
 844		for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 845	/* was if(selmon->sel) */
 846	if(selmon->sel && selmon->sel != c)
 847		unfocus(selmon->sel, False);
 848	if(c) {
 849		if(c->mon != selmon)
 850			selmon = c->mon;
 851		if(c->isurgent)
 852			clearurgent(c);
 853		detachstack(c);
 854		attachstack(c);
 855		grabbuttons(c, True);
 856		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 857		setfocus(c);
 858	}
 859	else
 860		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 861	selmon->sel = c;
 862	drawbars();
 863}
 864
 865void
 866focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 867	XFocusChangeEvent *ev = &e->xfocus;
 868
 869	if(selmon->sel && ev->window != selmon->sel->win)
 870		setfocus(selmon->sel);
 871}
 872
 873void
 874focusmon(const Arg *arg) {
 875	Monitor *m;
 876
 877	if(!mons->next)
 878		return;
 879	if((m = dirtomon(arg->i)) == selmon)
 880		return;
 881	unfocus(selmon->sel, True);
 882	selmon = m;
 883	focus(NULL);
 884}
 885
 886void
 887focusstack(const Arg *arg) {
 888	Client *c = NULL, *i;
 889
 890	if(!selmon->sel)
 891		return;
 892	if(arg->i > 0) {
 893		for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 894		if(!c)
 895			for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 896	}
 897	else {
 898		for(i = selmon->clients; i != selmon->sel; i = i->next)
 899			if(ISVISIBLE(i))
 900				c = i;
 901		if(!c)
 902			for(; i; i = i->next)
 903				if(ISVISIBLE(i))
 904					c = i;
 905	}
 906	if(c) {
 907		focus(c);
 908		restack(selmon);
 909	}
 910}
 911
 912Atom
 913getatomprop(Client *c, Atom prop) {
 914	int di;
 915	unsigned long dl;
 916	unsigned char *p = NULL;
 917	Atom da, atom = None;
 918
 919	if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 920	                      &da, &di, &dl, &dl, &p) == Success && p) {
 921		atom = *(Atom *)p;
 922		XFree(p);
 923	}
 924	return atom;
 925}
 926
 927unsigned long
 928getcolor(const char *colstr) {
 929	Colormap cmap = DefaultColormap(dpy, screen);
 930	XColor color;
 931
 932	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 933		die("error, cannot allocate color '%s'\n", colstr);
 934	return color.pixel;
 935}
 936
 937Bool
 938getrootptr(int *x, int *y) {
 939	int di;
 940	unsigned int dui;
 941	Window dummy;
 942
 943	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 944}
 945
 946long
 947getstate(Window w) {
 948	int format;
 949	long result = -1;
 950	unsigned char *p = NULL;
 951	unsigned long n, extra;
 952	Atom real;
 953
 954	if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 955	                      &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 956		return -1;
 957	if(n != 0)
 958		result = *p;
 959	XFree(p);
 960	return result;
 961}
 962
 963Bool
 964gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 965	char **list = NULL;
 966	int n;
 967	XTextProperty name;
 968
 969	if(!text || size == 0)
 970		return False;
 971	text[0] = '\0';
 972	XGetTextProperty(dpy, w, &name, atom);
 973	if(!name.nitems)
 974		return False;
 975	if(name.encoding == XA_STRING)
 976		strncpy(text, (char *)name.value, size - 1);
 977	else {
 978		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 979			strncpy(text, *list, size - 1);
 980			XFreeStringList(list);
 981		}
 982	}
 983	text[size - 1] = '\0';
 984	XFree(name.value);
 985	return True;
 986}
 987
 988void
 989grabbuttons(Client *c, Bool focused) {
 990	updatenumlockmask();
 991	{
 992		unsigned int i, j;
 993		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 994		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 995		if(focused) {
 996			for(i = 0; i < LENGTH(buttons); i++)
 997				if(buttons[i].click == ClkClientWin)
 998					for(j = 0; j < LENGTH(modifiers); j++)
 999						XGrabButton(dpy, buttons[i].button,
1000						            buttons[i].mask | modifiers[j],
1001						            c->win, False, BUTTONMASK,
1002						            GrabModeAsync, GrabModeSync, None, None);
1003		}
1004		else
1005			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1006			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1007	}
1008}
1009
1010void
1011grabkeys(void) {
1012	updatenumlockmask();
1013	{
1014		unsigned int i, j;
1015		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1016		KeyCode code;
1017
1018		XUngrabKey(dpy, AnyKey, AnyModifier, root);
1019		for(i = 0; i < LENGTH(keys); i++)
1020			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1021				for(j = 0; j < LENGTH(modifiers); j++)
1022					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1023						 True, GrabModeAsync, GrabModeAsync);
1024	}
1025}
1026
1027void
1028incnmaster(const Arg *arg) {
1029	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1030	arrange(selmon);
1031}
1032
1033void
1034initfont(const char *fontstr) {
1035	char *def, **missing;
1036	int n;
1037
1038	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1039	if(missing) {
1040		while(n--)
1041			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1042		XFreeStringList(missing);
1043	}
1044	if(dc.font.set) {
1045		XFontStruct **xfonts;
1046		char **font_names;
1047
1048		dc.font.ascent = dc.font.descent = 0;
1049		XExtentsOfFontSet(dc.font.set);
1050		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1051		while(n--) {
1052			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1053			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1054			xfonts++;
1055		}
1056	}
1057	else {
1058		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1059		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1060			die("error, cannot load font: '%s'\n", fontstr);
1061		dc.font.ascent = dc.font.xfont->ascent;
1062		dc.font.descent = dc.font.xfont->descent;
1063	}
1064	dc.font.height = dc.font.ascent + dc.font.descent;
1065}
1066
1067#ifdef XINERAMA
1068static Bool
1069isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1070	while(n--)
1071		if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1072		&& unique[n].width == info->width && unique[n].height == info->height)
1073			return False;
1074	return True;
1075}
1076#endif /* XINERAMA */
1077
1078void
1079keypress(XEvent *e) {
1080	unsigned int i;
1081	KeySym keysym;
1082	XKeyEvent *ev;
1083
1084	ev = &e->xkey;
1085	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1086	for(i = 0; i < LENGTH(keys); i++)
1087		if(keysym == keys[i].keysym
1088		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1089		&& keys[i].func)
1090			keys[i].func(&(keys[i].arg));
1091}
1092
1093void
1094killclient(const Arg *arg) {
1095	if(!selmon->sel)
1096		return;
1097	if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1098		XGrabServer(dpy);
1099		XSetErrorHandler(xerrordummy);
1100		XSetCloseDownMode(dpy, DestroyAll);
1101		XKillClient(dpy, selmon->sel->win);
1102		XSync(dpy, False);
1103		XSetErrorHandler(xerror);
1104		XUngrabServer(dpy);
1105	}
1106}
1107
1108void
1109manage(Window w, XWindowAttributes *wa) {
1110	Client *c, *t = NULL;
1111	Window trans = None;
1112	XWindowChanges wc;
1113
1114	if(!(c = calloc(1, sizeof(Client))))
1115		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1116	c->win = w;
1117	updatetitle(c);
1118	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1119		c->mon = t->mon;
1120		c->tags = t->tags;
1121	}
1122	else {
1123		c->mon = selmon;
1124		applyrules(c);
1125	}
1126	/* geometry */
1127	c->x = c->oldx = wa->x;
1128	c->y = c->oldy = wa->y;
1129	c->w = c->oldw = wa->width;
1130	c->h = c->oldh = wa->height;
1131	c->oldbw = wa->border_width;
1132
1133	if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1134		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1135	if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1136		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1137	c->x = MAX(c->x, c->mon->mx);
1138	/* only fix client y-offset, if the client center might cover the bar */
1139	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1140	           && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1141	c->bw = borderpx;
1142
1143	wc.border_width = c->bw;
1144	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1145	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1146	configure(c); /* propagates border_width, if size doesn't change */
1147	updatewindowtype(c);
1148	updatesizehints(c);
1149	updatewmhints(c);
1150	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1151	grabbuttons(c, False);
1152	if(!c->isfloating)
1153		c->isfloating = c->oldstate = trans != None || c->isfixed;
1154	if(c->isfloating)
1155		XRaiseWindow(dpy, c->win);
1156	attach(c);
1157	attachstack(c);
1158	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1159	setclientstate(c, NormalState);
1160	if (c->mon == selmon)
1161		unfocus(selmon->sel, False);
1162	c->mon->sel = c;
1163	arrange(c->mon);
1164	XMapWindow(dpy, c->win);
1165	focus(NULL);
1166}
1167
1168void
1169mappingnotify(XEvent *e) {
1170	XMappingEvent *ev = &e->xmapping;
1171
1172	XRefreshKeyboardMapping(ev);
1173	if(ev->request == MappingKeyboard)
1174		grabkeys();
1175}
1176
1177void
1178maprequest(XEvent *e) {
1179	static XWindowAttributes wa;
1180	XMapRequestEvent *ev = &e->xmaprequest;
1181
1182	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1183		return;
1184	if(wa.override_redirect)
1185		return;
1186	if(!wintoclient(ev->window))
1187		manage(ev->window, &wa);
1188}
1189
1190void
1191monocle(Monitor *m) {
1192	unsigned int n = 0;
1193	Client *c;
1194
1195	for(c = m->clients; c; c = c->next)
1196		if(ISVISIBLE(c))
1197			n++;
1198	if(n > 0) /* override layout symbol */
1199		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1200	for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1201		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1202}
1203
1204void
1205movemouse(const Arg *arg) {
1206	int x, y, ocx, ocy, nx, ny;
1207	Client *c;
1208	Monitor *m;
1209	XEvent ev;
1210
1211	if(!(c = selmon->sel))
1212		return;
1213	restack(selmon);
1214	ocx = c->x;
1215	ocy = c->y;
1216	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1217	None, cursor[CurMove], CurrentTime) != GrabSuccess)
1218		return;
1219	if(!getrootptr(&x, &y))
1220		return;
1221	do {
1222		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1223		switch(ev.type) {
1224		case ConfigureRequest:
1225		case Expose:
1226		case MapRequest:
1227			handler[ev.type](&ev);
1228			break;
1229		case MotionNotify:
1230			nx = ocx + (ev.xmotion.x - x);
1231			ny = ocy + (ev.xmotion.y - y);
1232			if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1233			&& ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1234				if(abs(selmon->wx - nx) < snap)
1235					nx = selmon->wx;
1236				else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1237					nx = selmon->wx + selmon->ww - WIDTH(c);
1238				if(abs(selmon->wy - ny) < snap)
1239					ny = selmon->wy;
1240				else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1241					ny = selmon->wy + selmon->wh - HEIGHT(c);
1242				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1243				&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1244					togglefloating(NULL);
1245			}
1246			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1247				resize(c, nx, ny, c->w, c->h, True);
1248			break;
1249		}
1250	} while(ev.type != ButtonRelease);
1251	XUngrabPointer(dpy, CurrentTime);
1252	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1253		sendmon(c, m);
1254		selmon = m;
1255		focus(NULL);
1256	}
1257}
1258
1259Client *
1260nexttiled(Client *c) {
1261	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1262	return c;
1263}
1264
1265void
1266pop(Client *c) {
1267	detach(c);
1268	attach(c);
1269	focus(c);
1270	arrange(c->mon);
1271}
1272
1273void
1274propertynotify(XEvent *e) {
1275	Client *c;
1276	Window trans;
1277	XPropertyEvent *ev = &e->xproperty;
1278
1279	if((ev->window == root) && (ev->atom == XA_WM_NAME))
1280		updatestatus();
1281	else if(ev->state == PropertyDelete)
1282		return; /* ignore */
1283	else if((c = wintoclient(ev->window))) {
1284		switch(ev->atom) {
1285		default: break;
1286		case XA_WM_TRANSIENT_FOR:
1287			if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1288			   (c->isfloating = (wintoclient(trans)) != NULL))
1289				arrange(c->mon);
1290			break;
1291		case XA_WM_NORMAL_HINTS:
1292			updatesizehints(c);
1293			break;
1294		case XA_WM_HINTS:
1295			updatewmhints(c);
1296			drawbars();
1297			break;
1298		}
1299		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1300			updatetitle(c);
1301			if(c == c->mon->sel)
1302				drawbar(c->mon);
1303		}
1304		if(ev->atom == netatom[NetWMWindowType])
1305			updatewindowtype(c);
1306	}
1307}
1308
1309void
1310quit(const Arg *arg) {
1311	running = False;
1312}
1313
1314Monitor *
1315recttomon(int x, int y, int w, int h) {
1316	Monitor *m, *r = selmon;
1317	int a, area = 0;
1318
1319	for(m = mons; m; m = m->next)
1320		if((a = INTERSECT(x, y, w, h, m)) > area) {
1321			area = a;
1322			r = m;
1323		}
1324	return r;
1325}
1326
1327void
1328resize(Client *c, int x, int y, int w, int h, Bool interact) {
1329	if(applysizehints(c, &x, &y, &w, &h, interact))
1330		resizeclient(c, x, y, w, h);
1331}
1332
1333void
1334resizeclient(Client *c, int x, int y, int w, int h) {
1335	XWindowChanges wc;
1336
1337	c->oldx = c->x; c->x = wc.x = x;
1338	c->oldy = c->y; c->y = wc.y = y;
1339	c->oldw = c->w; c->w = wc.width = w;
1340	c->oldh = c->h; c->h = wc.height = h;
1341	wc.border_width = c->bw;
1342	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1343	configure(c);
1344	XSync(dpy, False);
1345}
1346
1347void
1348resizemouse(const Arg *arg) {
1349	int ocx, ocy;
1350	int nw, nh;
1351	Client *c;
1352	Monitor *m;
1353	XEvent ev;
1354
1355	if(!(c = selmon->sel))
1356		return;
1357	restack(selmon);
1358	ocx = c->x;
1359	ocy = c->y;
1360	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1361	                None, cursor[CurResize], CurrentTime) != GrabSuccess)
1362		return;
1363	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1364	do {
1365		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1366		switch(ev.type) {
1367		case ConfigureRequest:
1368		case Expose:
1369		case MapRequest:
1370			handler[ev.type](&ev);
1371			break;
1372		case MotionNotify:
1373			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1374			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1375			if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1376			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1377			{
1378				if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1379				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1380					togglefloating(NULL);
1381			}
1382			if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1383				resize(c, c->x, c->y, nw, nh, True);
1384			break;
1385		}
1386	} while(ev.type != ButtonRelease);
1387	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1388	XUngrabPointer(dpy, CurrentTime);
1389	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1390	if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1391		sendmon(c, m);
1392		selmon = m;
1393		focus(NULL);
1394	}
1395}
1396
1397void
1398restack(Monitor *m) {
1399	Client *c;
1400	XEvent ev;
1401	XWindowChanges wc;
1402
1403	drawbar(m);
1404	if(!m->sel)
1405		return;
1406	if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1407		XRaiseWindow(dpy, m->sel->win);
1408	if(m->lt[m->sellt]->arrange) {
1409		wc.stack_mode = Below;
1410		wc.sibling = m->barwin;
1411		for(c = m->stack; c; c = c->snext)
1412			if(!c->isfloating && ISVISIBLE(c)) {
1413				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1414				wc.sibling = c->win;
1415			}
1416	}
1417	XSync(dpy, False);
1418	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1419}
1420
1421void
1422run(void) {
1423	XEvent ev;
1424	/* main event loop */
1425	XSync(dpy, False);
1426	while(running && !XNextEvent(dpy, &ev))
1427		if(handler[ev.type])
1428			handler[ev.type](&ev); /* call handler */
1429}
1430
1431void
1432scan(void) {
1433	unsigned int i, num;
1434	Window d1, d2, *wins = NULL;
1435	XWindowAttributes wa;
1436
1437	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1438		for(i = 0; i < num; i++) {
1439			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1440			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1441				continue;
1442			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1443				manage(wins[i], &wa);
1444		}
1445		for(i = 0; i < num; i++) { /* now the transients */
1446			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1447				continue;
1448			if(XGetTransientForHint(dpy, wins[i], &d1)
1449			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1450				manage(wins[i], &wa);
1451		}
1452		if(wins)
1453			XFree(wins);
1454	}
1455}
1456
1457void
1458sendmon(Client *c, Monitor *m) {
1459	if(c->mon == m)
1460		return;
1461	unfocus(c, True);
1462	detach(c);
1463	detachstack(c);
1464	c->mon = m;
1465	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1466	attach(c);
1467	attachstack(c);
1468	focus(NULL);
1469	arrange(NULL);
1470}
1471
1472void
1473setclientstate(Client *c, long state) {
1474	long data[] = { state, None };
1475
1476	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1477			PropModeReplace, (unsigned char *)data, 2);
1478}
1479
1480Bool
1481sendevent(Client *c, Atom proto) {
1482	int n;
1483	Atom *protocols;
1484	Bool exists = False;
1485	XEvent ev;
1486
1487	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1488		while(!exists && n--)
1489			exists = protocols[n] == proto;
1490		XFree(protocols);
1491	}
1492	if(exists) {
1493		ev.type = ClientMessage;
1494		ev.xclient.window = c->win;
1495		ev.xclient.message_type = wmatom[WMProtocols];
1496		ev.xclient.format = 32;
1497		ev.xclient.data.l[0] = proto;
1498		ev.xclient.data.l[1] = CurrentTime;
1499		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1500	}
1501	return exists;
1502}
1503
1504void
1505setfocus(Client *c) {
1506	if(!c->neverfocus)
1507		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1508	sendevent(c, wmatom[WMTakeFocus]);
1509}
1510
1511void
1512setfullscreen(Client *c, Bool fullscreen) {
1513	if(fullscreen) {
1514		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1515		                PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1516		c->isfullscreen = True;
1517		c->oldstate = c->isfloating;
1518		c->oldbw = c->bw;
1519		c->bw = 0;
1520		c->isfloating = True;
1521		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1522		XRaiseWindow(dpy, c->win);
1523	}
1524	else {
1525		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1526		                PropModeReplace, (unsigned char*)0, 0);
1527		c->isfullscreen = False;
1528		c->isfloating = c->oldstate;
1529		c->bw = c->oldbw;
1530		c->x = c->oldx;
1531		c->y = c->oldy;
1532		c->w = c->oldw;
1533		c->h = c->oldh;
1534		resizeclient(c, c->x, c->y, c->w, c->h);
1535		arrange(c->mon);
1536	}
1537}
1538
1539void
1540setlayout(const Arg *arg) {
1541	if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1542		selmon->sellt ^= 1;
1543	if(arg && arg->v)
1544		selmon->lt[selmon->sellt] = (Layout *)arg->v;
1545	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1546	if(selmon->sel)
1547		arrange(selmon);
1548	else
1549		drawbar(selmon);
1550}
1551
1552/* arg > 1.0 will set mfact absolutly */
1553void
1554setmfact(const Arg *arg) {
1555	float f;
1556
1557	if(!arg || !selmon->lt[selmon->sellt]->arrange)
1558		return;
1559	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1560	if(f < 0.1 || f > 0.9)
1561		return;
1562	selmon->mfact = f;
1563	arrange(selmon);
1564}
1565
1566void
1567setup(void) {
1568	XSetWindowAttributes wa;
1569
1570	/* clean up any zombies immediately */
1571	sigchld(0);
1572
1573	/* init screen */
1574	screen = DefaultScreen(dpy);
1575	root = RootWindow(dpy, screen);
1576	initfont(font);
1577	sw = DisplayWidth(dpy, screen);
1578	sh = DisplayHeight(dpy, screen);
1579	bh = dc.h = dc.font.height + 2;
1580	updategeom();
1581	/* init atoms */
1582	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1583	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1584	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1585	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1586	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1587	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1588	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1589	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1590	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1591	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1592	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1593	/* init cursors */
1594	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1595	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1596	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1597	/* init appearance */
1598	dc.norm[ColBorder] = getcolor(normbordercolor);
1599	dc.norm[ColBG] = getcolor(normbgcolor);
1600	dc.norm[ColFG] = getcolor(normfgcolor);
1601	dc.sel[ColBorder] = getcolor(selbordercolor);
1602	dc.sel[ColBG] = getcolor(selbgcolor);
1603	dc.sel[ColFG] = getcolor(selfgcolor);
1604	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1605	dc.gc = XCreateGC(dpy, root, 0, NULL);
1606	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1607	if(!dc.font.set)
1608		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1609	/* init bars */
1610	updatebars();
1611	updatestatus();
1612	/* EWMH support per view */
1613	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1614			PropModeReplace, (unsigned char *) netatom, NetLast);
1615	/* select for events */
1616	wa.cursor = cursor[CurNormal];
1617	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1618	                |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1619	                |PropertyChangeMask;
1620	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1621	XSelectInput(dpy, root, wa.event_mask);
1622	grabkeys();
1623}
1624
1625void
1626showhide(Client *c) {
1627	if(!c)
1628		return;
1629	if(ISVISIBLE(c)) { /* show clients top down */
1630		XMoveWindow(dpy, c->win, c->x, c->y);
1631		if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1632			resize(c, c->x, c->y, c->w, c->h, False);
1633		showhide(c->snext);
1634	}
1635	else { /* hide clients bottom up */
1636		showhide(c->snext);
1637		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1638	}
1639}
1640
1641void
1642sigchld(int unused) {
1643	if(signal(SIGCHLD, sigchld) == SIG_ERR)
1644		die("Can't install SIGCHLD handler");
1645	while(0 < waitpid(-1, NULL, WNOHANG));
1646}
1647
1648void
1649spawn(const Arg *arg) {
1650	if(fork() == 0) {
1651		if(dpy)
1652			close(ConnectionNumber(dpy));
1653		setsid();
1654		execvp(((char **)arg->v)[0], (char **)arg->v);
1655		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1656		perror(" failed");
1657		exit(EXIT_SUCCESS);
1658	}
1659}
1660
1661void
1662tag(const Arg *arg) {
1663	if(selmon->sel && arg->ui & TAGMASK) {
1664		selmon->sel->tags = arg->ui & TAGMASK;
1665		focus(NULL);
1666		arrange(selmon);
1667	}
1668}
1669
1670void
1671tagmon(const Arg *arg) {
1672	if(!selmon->sel || !mons->next)
1673		return;
1674	sendmon(selmon->sel, dirtomon(arg->i));
1675}
1676
1677int
1678textnw(const char *text, unsigned int len) {
1679	XRectangle r;
1680
1681	if(dc.font.set) {
1682		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1683		return r.width;
1684	}
1685	return XTextWidth(dc.font.xfont, text, len);
1686}
1687
1688void
1689tile(Monitor *m) {
1690	unsigned int i, n, h, mw, my, ty;
1691	Client *c;
1692
1693	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1694	if(n == 0)
1695		return;
1696
1697	if(n > m->nmaster)
1698		mw = m->nmaster ? m->ww * m->mfact : 0;
1699	else
1700		mw = m->ww;
1701	for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1702		if(i < m->nmaster) {
1703			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1704			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1705			my += HEIGHT(c);
1706		}
1707		else {
1708			h = (m->wh - ty) / (n - i);
1709			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1710			ty += HEIGHT(c);
1711		}
1712}
1713
1714void
1715togglebar(const Arg *arg) {
1716	selmon->showbar = !selmon->showbar;
1717	updatebarpos(selmon);
1718	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1719	arrange(selmon);
1720}
1721
1722void
1723togglefloating(const Arg *arg) {
1724	if(!selmon->sel)
1725		return;
1726	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1727	if(selmon->sel->isfloating)
1728		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1729		       selmon->sel->w, selmon->sel->h, False);
1730	arrange(selmon);
1731}
1732
1733void
1734toggletag(const Arg *arg) {
1735	unsigned int newtags;
1736
1737	if(!selmon->sel)
1738		return;
1739	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1740	if(newtags) {
1741		selmon->sel->tags = newtags;
1742		focus(NULL);
1743		arrange(selmon);
1744	}
1745}
1746
1747void
1748toggleview(const Arg *arg) {
1749	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1750
1751	if(newtagset) {
1752		selmon->tagset[selmon->seltags] = newtagset;
1753		focus(NULL);
1754		arrange(selmon);
1755	}
1756}
1757
1758void
1759unfocus(Client *c, Bool setfocus) {
1760	if(!c)
1761		return;
1762	grabbuttons(c, False);
1763	XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1764	if(setfocus)
1765		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1766}
1767
1768void
1769unmanage(Client *c, Bool destroyed) {
1770	Monitor *m = c->mon;
1771	XWindowChanges wc;
1772
1773	/* The server grab construct avoids race conditions. */
1774	detach(c);
1775	detachstack(c);
1776	if(!destroyed) {
1777		wc.border_width = c->oldbw;
1778		XGrabServer(dpy);
1779		XSetErrorHandler(xerrordummy);
1780		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1781		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1782		setclientstate(c, WithdrawnState);
1783		XSync(dpy, False);
1784		XSetErrorHandler(xerror);
1785		XUngrabServer(dpy);
1786	}
1787	free(c);
1788	focus(NULL);
1789	arrange(m);
1790}
1791
1792void
1793unmapnotify(XEvent *e) {
1794	Client *c;
1795	XUnmapEvent *ev = &e->xunmap;
1796
1797	if((c = wintoclient(ev->window))) {
1798		if(ev->send_event)
1799			setclientstate(c, WithdrawnState);
1800		else
1801			unmanage(c, False);
1802	}
1803}
1804
1805void
1806updatebars(void) {
1807	Monitor *m;
1808	XSetWindowAttributes wa = {
1809		.override_redirect = True,
1810		.background_pixmap = ParentRelative,
1811		.event_mask = ButtonPressMask|ExposureMask
1812	};
1813	for(m = mons; m; m = m->next) {
1814		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1815		                          CopyFromParent, DefaultVisual(dpy, screen),
1816		                          CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1817		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1818		XMapRaised(dpy, m->barwin);
1819	}
1820}
1821
1822void
1823updatebarpos(Monitor *m) {
1824	m->wy = m->my;
1825	m->wh = m->mh;
1826	if(m->showbar) {
1827		m->wh -= bh;
1828		m->by = m->topbar ? m->wy : m->wy + m->wh;
1829		m->wy = m->topbar ? m->wy + bh : m->wy;
1830	}
1831	else
1832		m->by = -bh;
1833}
1834
1835Bool
1836updategeom(void) {
1837	Bool dirty = False;
1838
1839#ifdef XINERAMA
1840	if(XineramaIsActive(dpy)) {
1841		int i, j, n, nn;
1842		Client *c;
1843		Monitor *m;
1844		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1845		XineramaScreenInfo *unique = NULL;
1846
1847		for(n = 0, m = mons; m; m = m->next, n++);
1848		/* only consider unique geometries as separate screens */
1849		if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1850			die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1851		for(i = 0, j = 0; i < nn; i++)
1852			if(isuniquegeom(unique, j, &info[i]))
1853				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1854		XFree(info);
1855		nn = j;
1856		if(n <= nn) {
1857			for(i = 0; i < (nn - n); i++) { /* new monitors available */
1858				for(m = mons; m && m->next; m = m->next);
1859				if(m)
1860					m->next = createmon();
1861				else
1862					mons = createmon();
1863			}
1864			for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1865				if(i >= n
1866				|| (unique[i].x_org != m->mx || unique[i].y_org != m->my
1867				    || unique[i].width != m->mw || unique[i].height != m->mh))
1868				{
1869					dirty = True;
1870					m->num = i;
1871					m->mx = m->wx = unique[i].x_org;
1872					m->my = m->wy = unique[i].y_org;
1873					m->mw = m->ww = unique[i].width;
1874					m->mh = m->wh = unique[i].height;
1875					updatebarpos(m);
1876				}
1877		}
1878		else { /* less monitors available nn < n */
1879			for(i = nn; i < n; i++) {
1880				for(m = mons; m && m->next; m = m->next);
1881				while(m->clients) {
1882					dirty = True;
1883					c = m->clients;
1884					m->clients = c->next;
1885					detachstack(c);
1886					c->mon = mons;
1887					attach(c);
1888					attachstack(c);
1889				}
1890				if(m == selmon)
1891					selmon = mons;
1892				cleanupmon(m);
1893			}
1894		}
1895		free(unique);
1896	}
1897	else
1898#endif /* XINERAMA */
1899	/* default monitor setup */
1900	{
1901		if(!mons)
1902			mons = createmon();
1903		if(mons->mw != sw || mons->mh != sh) {
1904			dirty = True;
1905			mons->mw = mons->ww = sw;
1906			mons->mh = mons->wh = sh;
1907			updatebarpos(mons);
1908		}
1909	}
1910	if(dirty) {
1911		selmon = mons;
1912		selmon = wintomon(root);
1913	}
1914	return dirty;
1915}
1916
1917void
1918updatenumlockmask(void) {
1919	unsigned int i, j;
1920	XModifierKeymap *modmap;
1921
1922	numlockmask = 0;
1923	modmap = XGetModifierMapping(dpy);
1924	for(i = 0; i < 8; i++)
1925		for(j = 0; j < modmap->max_keypermod; j++)
1926			if(modmap->modifiermap[i * modmap->max_keypermod + j]
1927			   == XKeysymToKeycode(dpy, XK_Num_Lock))
1928				numlockmask = (1 << i);
1929	XFreeModifiermap(modmap);
1930}
1931
1932void
1933updatesizehints(Client *c) {
1934	long msize;
1935	XSizeHints size;
1936
1937	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1938		/* size is uninitialized, ensure that size.flags aren't used */
1939		size.flags = PSize;
1940	if(size.flags & PBaseSize) {
1941		c->basew = size.base_width;
1942		c->baseh = size.base_height;
1943	}
1944	else if(size.flags & PMinSize) {
1945		c->basew = size.min_width;
1946		c->baseh = size.min_height;
1947	}
1948	else
1949		c->basew = c->baseh = 0;
1950	if(size.flags & PResizeInc) {
1951		c->incw = size.width_inc;
1952		c->inch = size.height_inc;
1953	}
1954	else
1955		c->incw = c->inch = 0;
1956	if(size.flags & PMaxSize) {
1957		c->maxw = size.max_width;
1958		c->maxh = size.max_height;
1959	}
1960	else
1961		c->maxw = c->maxh = 0;
1962	if(size.flags & PMinSize) {
1963		c->minw = size.min_width;
1964		c->minh = size.min_height;
1965	}
1966	else if(size.flags & PBaseSize) {
1967		c->minw = size.base_width;
1968		c->minh = size.base_height;
1969	}
1970	else
1971		c->minw = c->minh = 0;
1972	if(size.flags & PAspect) {
1973		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1974		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1975	}
1976	else
1977		c->maxa = c->mina = 0.0;
1978	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1979	             && c->maxw == c->minw && c->maxh == c->minh);
1980}
1981
1982void
1983updatetitle(Client *c) {
1984	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1985		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1986	if(c->name[0] == '\0') /* hack to mark broken clients */
1987		strcpy(c->name, broken);
1988}
1989
1990void
1991updatestatus(void) {
1992	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1993		strcpy(stext, "dwm-"VERSION);
1994	drawbar(selmon);
1995}
1996
1997void
1998updatewindowtype(Client *c) {
1999	Atom state = getatomprop(c, netatom[NetWMState]);
2000	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2001
2002	if(state == netatom[NetWMFullscreen])
2003		setfullscreen(c, True);
2004
2005	if(wtype == netatom[NetWMWindowTypeDialog])
2006		c->isfloating = True;
2007}
2008
2009void
2010updatewmhints(Client *c) {
2011	XWMHints *wmh;
2012
2013	if((wmh = XGetWMHints(dpy, c->win))) {
2014		if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2015			wmh->flags &= ~XUrgencyHint;
2016			XSetWMHints(dpy, c->win, wmh);
2017		}
2018		else
2019			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2020		if(wmh->flags & InputHint)
2021			c->neverfocus = !wmh->input;
2022		else
2023			c->neverfocus = False;
2024		XFree(wmh);
2025	}
2026}
2027
2028void
2029view(const Arg *arg) {
2030	if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2031		return;
2032	selmon->seltags ^= 1; /* toggle sel tagset */
2033	if(arg->ui & TAGMASK)
2034		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2035	focus(NULL);
2036	arrange(selmon);
2037}
2038
2039Client *
2040wintoclient(Window w) {
2041	Client *c;
2042	Monitor *m;
2043
2044	for(m = mons; m; m = m->next)
2045		for(c = m->clients; c; c = c->next)
2046			if(c->win == w)
2047				return c;
2048	return NULL;
2049}
2050
2051Monitor *
2052wintomon(Window w) {
2053	int x, y;
2054	Client *c;
2055	Monitor *m;
2056
2057	if(w == root && getrootptr(&x, &y))
2058		return recttomon(x, y, 1, 1);
2059	for(m = mons; m; m = m->next)
2060		if(w == m->barwin)
2061			return m;
2062	if((c = wintoclient(w)))
2063		return c->mon;
2064	return selmon;
2065}
2066
2067/* There's no way to check accesses to destroyed windows, thus those cases are
2068 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2069 * default error handler, which may call exit.  */
2070int
2071xerror(Display *dpy, XErrorEvent *ee) {
2072	if(ee->error_code == BadWindow
2073	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2074	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2075	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2076	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2077	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2078	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2079	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2080	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2081		return 0;
2082	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2083			ee->request_code, ee->error_code);
2084	return xerrorxlib(dpy, ee); /* may call exit */
2085}
2086
2087int
2088xerrordummy(Display *dpy, XErrorEvent *ee) {
2089	return 0;
2090}
2091
2092/* Startup Error handler to check if another window manager
2093 * is already running. */
2094int
2095xerrorstart(Display *dpy, XErrorEvent *ee) {
2096	die("dwm: another window manager is already running\n");
2097	return -1;
2098}
2099
2100void
2101zoom(const Arg *arg) {
2102	Client *c = selmon->sel;
2103
2104	if(!selmon->lt[selmon->sellt]->arrange
2105	|| (selmon->sel && selmon->sel->isfloating))
2106		return;
2107	if(c == nexttiled(selmon->clients))
2108		if(!c || !(c = nexttiled(c->next)))
2109			return;
2110	pop(c);
2111}
2112
2113int
2114main(int argc, char *argv[]) {
2115	if(argc == 2 && !strcmp("-v", argv[1]))
2116		die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2117	else if(argc != 1)
2118		die("usage: dwm [-v]\n");
2119	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2120		fputs("warning: no locale support\n", stderr);
2121	if(!(dpy = XOpenDisplay(NULL)))
2122		die("dwm: cannot open display\n");
2123	checkotherwm();
2124	setup();
2125	scan();
2126	run();
2127	cleanup();
2128	XCloseDisplay(dpy);
2129	return EXIT_SUCCESS;
2130}