dwm

dynamic window manager
git clone git://git.suckless.org/dwm
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dwm.c (52923B)


      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 <signal.h>
     26 #include <stdarg.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 #include <X11/Xft/Xft.h>
     43 
     44 #include "drw.h"
     45 #include "util.h"
     46 
     47 /* macros */
     48 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
     49 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
     50 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
     51                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
     52 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
     53 #define LENGTH(X)               (sizeof X / sizeof X[0])
     54 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
     55 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
     56 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
     57 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
     58 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
     59 
     60 /* enums */
     61 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
     62 enum { SchemeNorm, SchemeSel }; /* color schemes */
     63 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
     64        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
     65        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
     66 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
     67 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
     68        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
     69 
     70 typedef union {
     71 	int i;
     72 	unsigned int ui;
     73 	float f;
     74 	const void *v;
     75 } Arg;
     76 
     77 typedef struct {
     78 	unsigned int click;
     79 	unsigned int mask;
     80 	unsigned int button;
     81 	void (*func)(const Arg *arg);
     82 	const Arg arg;
     83 } Button;
     84 
     85 typedef struct Monitor Monitor;
     86 typedef struct Client Client;
     87 struct Client {
     88 	char name[256];
     89 	float mina, maxa;
     90 	int x, y, w, h;
     91 	int oldx, oldy, oldw, oldh;
     92 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
     93 	int bw, oldbw;
     94 	unsigned int tags;
     95 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
     96 	Client *next;
     97 	Client *snext;
     98 	Monitor *mon;
     99 	Window win;
    100 };
    101 
    102 typedef struct {
    103 	unsigned int mod;
    104 	KeySym keysym;
    105 	void (*func)(const Arg *);
    106 	const Arg arg;
    107 } Key;
    108 
    109 typedef struct {
    110 	const char *symbol;
    111 	void (*arrange)(Monitor *);
    112 } Layout;
    113 
    114 struct Monitor {
    115 	char ltsymbol[16];
    116 	float mfact;
    117 	int nmaster;
    118 	int num;
    119 	int by;               /* bar geometry */
    120 	int mx, my, mw, mh;   /* screen size */
    121 	int wx, wy, ww, wh;   /* window area  */
    122 	unsigned int seltags;
    123 	unsigned int sellt;
    124 	unsigned int tagset[2];
    125 	int showbar;
    126 	int topbar;
    127 	Client *clients;
    128 	Client *sel;
    129 	Client *stack;
    130 	Monitor *next;
    131 	Window barwin;
    132 	const Layout *lt[2];
    133 };
    134 
    135 typedef struct {
    136 	const char *class;
    137 	const char *instance;
    138 	const char *title;
    139 	unsigned int tags;
    140 	int isfloating;
    141 	int monitor;
    142 } Rule;
    143 
    144 /* function declarations */
    145 static void applyrules(Client *c);
    146 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
    147 static void arrange(Monitor *m);
    148 static void arrangemon(Monitor *m);
    149 static void attach(Client *c);
    150 static void attachstack(Client *c);
    151 static void buttonpress(XEvent *e);
    152 static void checkotherwm(void);
    153 static void cleanup(void);
    154 static void cleanupmon(Monitor *mon);
    155 static void clientmessage(XEvent *e);
    156 static void configure(Client *c);
    157 static void configurenotify(XEvent *e);
    158 static void configurerequest(XEvent *e);
    159 static Monitor *createmon(void);
    160 static void destroynotify(XEvent *e);
    161 static void detach(Client *c);
    162 static void detachstack(Client *c);
    163 static Monitor *dirtomon(int dir);
    164 static void drawbar(Monitor *m);
    165 static void drawbars(void);
    166 static void enternotify(XEvent *e);
    167 static void expose(XEvent *e);
    168 static void focus(Client *c);
    169 static void focusin(XEvent *e);
    170 static void focusmon(const Arg *arg);
    171 static void focusstack(const Arg *arg);
    172 static Atom getatomprop(Client *c, Atom prop);
    173 static int getrootptr(int *x, int *y);
    174 static long getstate(Window w);
    175 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
    176 static void grabbuttons(Client *c, int focused);
    177 static void grabkeys(void);
    178 static void incnmaster(const Arg *arg);
    179 static void keypress(XEvent *e);
    180 static void killclient(const Arg *arg);
    181 static void manage(Window w, XWindowAttributes *wa);
    182 static void mappingnotify(XEvent *e);
    183 static void maprequest(XEvent *e);
    184 static void monocle(Monitor *m);
    185 static void motionnotify(XEvent *e);
    186 static void movemouse(const Arg *arg);
    187 static Client *nexttiled(Client *c);
    188 static void pop(Client *);
    189 static void propertynotify(XEvent *e);
    190 static void quit(const Arg *arg);
    191 static Monitor *recttomon(int x, int y, int w, int h);
    192 static void resize(Client *c, int x, int y, int w, int h, int interact);
    193 static void resizeclient(Client *c, int x, int y, int w, int h);
    194 static void resizemouse(const Arg *arg);
    195 static void restack(Monitor *m);
    196 static void run(void);
    197 static void scan(void);
    198 static int sendevent(Client *c, Atom proto);
    199 static void sendmon(Client *c, Monitor *m);
    200 static void setclientstate(Client *c, long state);
    201 static void setfocus(Client *c);
    202 static void setfullscreen(Client *c, int fullscreen);
    203 static void setlayout(const Arg *arg);
    204 static void setmfact(const Arg *arg);
    205 static void setup(void);
    206 static void seturgent(Client *c, int urg);
    207 static void showhide(Client *c);
    208 static void sigchld(int unused);
    209 static void spawn(const Arg *arg);
    210 static void tag(const Arg *arg);
    211 static void tagmon(const Arg *arg);
    212 static void tile(Monitor *);
    213 static void togglebar(const Arg *arg);
    214 static void togglefloating(const Arg *arg);
    215 static void toggletag(const Arg *arg);
    216 static void toggleview(const Arg *arg);
    217 static void unfocus(Client *c, int setfocus);
    218 static void unmanage(Client *c, int destroyed);
    219 static void unmapnotify(XEvent *e);
    220 static void updatebarpos(Monitor *m);
    221 static void updatebars(void);
    222 static void updateclientlist(void);
    223 static int updategeom(void);
    224 static void updatenumlockmask(void);
    225 static void updatesizehints(Client *c);
    226 static void updatestatus(void);
    227 static void updatetitle(Client *c);
    228 static void updatewindowtype(Client *c);
    229 static void updatewmhints(Client *c);
    230 static void view(const Arg *arg);
    231 static Client *wintoclient(Window w);
    232 static Monitor *wintomon(Window w);
    233 static int xerror(Display *dpy, XErrorEvent *ee);
    234 static int xerrordummy(Display *dpy, XErrorEvent *ee);
    235 static int xerrorstart(Display *dpy, XErrorEvent *ee);
    236 static void zoom(const Arg *arg);
    237 
    238 /* variables */
    239 static const char broken[] = "broken";
    240 static char stext[256];
    241 static int screen;
    242 static int sw, sh;           /* X display screen geometry width, height */
    243 static int bh, blw = 0;      /* bar geometry */
    244 static int lrpad;            /* sum of left and right padding for text */
    245 static int (*xerrorxlib)(Display *, XErrorEvent *);
    246 static unsigned int numlockmask = 0;
    247 static void (*handler[LASTEvent]) (XEvent *) = {
    248 	[ButtonPress] = buttonpress,
    249 	[ClientMessage] = clientmessage,
    250 	[ConfigureRequest] = configurerequest,
    251 	[ConfigureNotify] = configurenotify,
    252 	[DestroyNotify] = destroynotify,
    253 	[EnterNotify] = enternotify,
    254 	[Expose] = expose,
    255 	[FocusIn] = focusin,
    256 	[KeyPress] = keypress,
    257 	[MappingNotify] = mappingnotify,
    258 	[MapRequest] = maprequest,
    259 	[MotionNotify] = motionnotify,
    260 	[PropertyNotify] = propertynotify,
    261 	[UnmapNotify] = unmapnotify
    262 };
    263 static Atom wmatom[WMLast], netatom[NetLast];
    264 static int running = 1;
    265 static Cur *cursor[CurLast];
    266 static Clr **scheme;
    267 static Display *dpy;
    268 static Drw *drw;
    269 static Monitor *mons, *selmon;
    270 static Window root, wmcheckwin;
    271 
    272 /* configuration, allows nested code to access above variables */
    273 #include "config.h"
    274 
    275 /* compile-time check if all tags fit into an unsigned int bit array. */
    276 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
    277 
    278 /* function implementations */
    279 void
    280 applyrules(Client *c)
    281 {
    282 	const char *class, *instance;
    283 	unsigned int i;
    284 	const Rule *r;
    285 	Monitor *m;
    286 	XClassHint ch = { NULL, NULL };
    287 
    288 	/* rule matching */
    289 	c->isfloating = 0;
    290 	c->tags = 0;
    291 	XGetClassHint(dpy, c->win, &ch);
    292 	class    = ch.res_class ? ch.res_class : broken;
    293 	instance = ch.res_name  ? ch.res_name  : broken;
    294 
    295 	for (i = 0; i < LENGTH(rules); i++) {
    296 		r = &rules[i];
    297 		if ((!r->title || strstr(c->name, r->title))
    298 		&& (!r->class || strstr(class, r->class))
    299 		&& (!r->instance || strstr(instance, r->instance)))
    300 		{
    301 			c->isfloating = r->isfloating;
    302 			c->tags |= r->tags;
    303 			for (m = mons; m && m->num != r->monitor; m = m->next);
    304 			if (m)
    305 				c->mon = m;
    306 		}
    307 	}
    308 	if (ch.res_class)
    309 		XFree(ch.res_class);
    310 	if (ch.res_name)
    311 		XFree(ch.res_name);
    312 	c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
    313 }
    314 
    315 int
    316 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
    317 {
    318 	int baseismin;
    319 	Monitor *m = c->mon;
    320 
    321 	/* set minimum possible */
    322 	*w = MAX(1, *w);
    323 	*h = MAX(1, *h);
    324 	if (interact) {
    325 		if (*x > sw)
    326 			*x = sw - WIDTH(c);
    327 		if (*y > sh)
    328 			*y = sh - HEIGHT(c);
    329 		if (*x + *w + 2 * c->bw < 0)
    330 			*x = 0;
    331 		if (*y + *h + 2 * c->bw < 0)
    332 			*y = 0;
    333 	} else {
    334 		if (*x >= m->wx + m->ww)
    335 			*x = m->wx + m->ww - WIDTH(c);
    336 		if (*y >= m->wy + m->wh)
    337 			*y = m->wy + m->wh - HEIGHT(c);
    338 		if (*x + *w + 2 * c->bw <= m->wx)
    339 			*x = m->wx;
    340 		if (*y + *h + 2 * c->bw <= m->wy)
    341 			*y = m->wy;
    342 	}
    343 	if (*h < bh)
    344 		*h = bh;
    345 	if (*w < bh)
    346 		*w = bh;
    347 	if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
    348 		/* see last two sentences in ICCCM 4.1.2.3 */
    349 		baseismin = c->basew == c->minw && c->baseh == c->minh;
    350 		if (!baseismin) { /* temporarily remove base dimensions */
    351 			*w -= c->basew;
    352 			*h -= c->baseh;
    353 		}
    354 		/* adjust for aspect limits */
    355 		if (c->mina > 0 && c->maxa > 0) {
    356 			if (c->maxa < (float)*w / *h)
    357 				*w = *h * c->maxa + 0.5;
    358 			else if (c->mina < (float)*h / *w)
    359 				*h = *w * c->mina + 0.5;
    360 		}
    361 		if (baseismin) { /* increment calculation requires this */
    362 			*w -= c->basew;
    363 			*h -= c->baseh;
    364 		}
    365 		/* adjust for increment value */
    366 		if (c->incw)
    367 			*w -= *w % c->incw;
    368 		if (c->inch)
    369 			*h -= *h % c->inch;
    370 		/* restore base dimensions */
    371 		*w = MAX(*w + c->basew, c->minw);
    372 		*h = MAX(*h + c->baseh, c->minh);
    373 		if (c->maxw)
    374 			*w = MIN(*w, c->maxw);
    375 		if (c->maxh)
    376 			*h = MIN(*h, c->maxh);
    377 	}
    378 	return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
    379 }
    380 
    381 void
    382 arrange(Monitor *m)
    383 {
    384 	if (m)
    385 		showhide(m->stack);
    386 	else for (m = mons; m; m = m->next)
    387 		showhide(m->stack);
    388 	if (m) {
    389 		arrangemon(m);
    390 		restack(m);
    391 	} else for (m = mons; m; m = m->next)
    392 		arrangemon(m);
    393 }
    394 
    395 void
    396 arrangemon(Monitor *m)
    397 {
    398 	strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
    399 	if (m->lt[m->sellt]->arrange)
    400 		m->lt[m->sellt]->arrange(m);
    401 }
    402 
    403 void
    404 attach(Client *c)
    405 {
    406 	c->next = c->mon->clients;
    407 	c->mon->clients = c;
    408 }
    409 
    410 void
    411 attachstack(Client *c)
    412 {
    413 	c->snext = c->mon->stack;
    414 	c->mon->stack = c;
    415 }
    416 
    417 void
    418 buttonpress(XEvent *e)
    419 {
    420 	unsigned int i, x, click;
    421 	Arg arg = {0};
    422 	Client *c;
    423 	Monitor *m;
    424 	XButtonPressedEvent *ev = &e->xbutton;
    425 
    426 	click = ClkRootWin;
    427 	/* focus monitor if necessary */
    428 	if ((m = wintomon(ev->window)) && m != selmon) {
    429 		unfocus(selmon->sel, 1);
    430 		selmon = m;
    431 		focus(NULL);
    432 	}
    433 	if (ev->window == selmon->barwin) {
    434 		i = x = 0;
    435 		do
    436 			x += TEXTW(tags[i]);
    437 		while (ev->x >= x && ++i < LENGTH(tags));
    438 		if (i < LENGTH(tags)) {
    439 			click = ClkTagBar;
    440 			arg.ui = 1 << i;
    441 		} else if (ev->x < x + blw)
    442 			click = ClkLtSymbol;
    443 		else if (ev->x > selmon->ww - TEXTW(stext))
    444 			click = ClkStatusText;
    445 		else
    446 			click = ClkWinTitle;
    447 	} else if ((c = wintoclient(ev->window))) {
    448 		focus(c);
    449 		restack(selmon);
    450 		XAllowEvents(dpy, ReplayPointer, CurrentTime);
    451 		click = ClkClientWin;
    452 	}
    453 	for (i = 0; i < LENGTH(buttons); i++)
    454 		if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
    455 		&& CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
    456 			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
    457 }
    458 
    459 void
    460 checkotherwm(void)
    461 {
    462 	xerrorxlib = XSetErrorHandler(xerrorstart);
    463 	/* this causes an error if some other window manager is running */
    464 	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
    465 	XSync(dpy, False);
    466 	XSetErrorHandler(xerror);
    467 	XSync(dpy, False);
    468 }
    469 
    470 void
    471 cleanup(void)
    472 {
    473 	Arg a = {.ui = ~0};
    474 	Layout foo = { "", NULL };
    475 	Monitor *m;
    476 	size_t i;
    477 
    478 	view(&a);
    479 	selmon->lt[selmon->sellt] = &foo;
    480 	for (m = mons; m; m = m->next)
    481 		while (m->stack)
    482 			unmanage(m->stack, 0);
    483 	XUngrabKey(dpy, AnyKey, AnyModifier, root);
    484 	while (mons)
    485 		cleanupmon(mons);
    486 	for (i = 0; i < CurLast; i++)
    487 		drw_cur_free(drw, cursor[i]);
    488 	for (i = 0; i < LENGTH(colors); i++)
    489 		free(scheme[i]);
    490 	XDestroyWindow(dpy, wmcheckwin);
    491 	drw_free(drw);
    492 	XSync(dpy, False);
    493 	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
    494 	XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    495 }
    496 
    497 void
    498 cleanupmon(Monitor *mon)
    499 {
    500 	Monitor *m;
    501 
    502 	if (mon == mons)
    503 		mons = mons->next;
    504 	else {
    505 		for (m = mons; m && m->next != mon; m = m->next);
    506 		m->next = mon->next;
    507 	}
    508 	XUnmapWindow(dpy, mon->barwin);
    509 	XDestroyWindow(dpy, mon->barwin);
    510 	free(mon);
    511 }
    512 
    513 void
    514 clientmessage(XEvent *e)
    515 {
    516 	XClientMessageEvent *cme = &e->xclient;
    517 	Client *c = wintoclient(cme->window);
    518 
    519 	if (!c)
    520 		return;
    521 	if (cme->message_type == netatom[NetWMState]) {
    522 		if (cme->data.l[1] == netatom[NetWMFullscreen]
    523 		|| cme->data.l[2] == netatom[NetWMFullscreen])
    524 			setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
    525 				|| (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
    526 	} else if (cme->message_type == netatom[NetActiveWindow]) {
    527 		if (c != selmon->sel && !c->isurgent)
    528 			seturgent(c, 1);
    529 	}
    530 }
    531 
    532 void
    533 configure(Client *c)
    534 {
    535 	XConfigureEvent ce;
    536 
    537 	ce.type = ConfigureNotify;
    538 	ce.display = dpy;
    539 	ce.event = c->win;
    540 	ce.window = c->win;
    541 	ce.x = c->x;
    542 	ce.y = c->y;
    543 	ce.width = c->w;
    544 	ce.height = c->h;
    545 	ce.border_width = c->bw;
    546 	ce.above = None;
    547 	ce.override_redirect = False;
    548 	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
    549 }
    550 
    551 void
    552 configurenotify(XEvent *e)
    553 {
    554 	Monitor *m;
    555 	Client *c;
    556 	XConfigureEvent *ev = &e->xconfigure;
    557 	int dirty;
    558 
    559 	/* TODO: updategeom handling sucks, needs to be simplified */
    560 	if (ev->window == root) {
    561 		dirty = (sw != ev->width || sh != ev->height);
    562 		sw = ev->width;
    563 		sh = ev->height;
    564 		if (updategeom() || dirty) {
    565 			drw_resize(drw, sw, bh);
    566 			updatebars();
    567 			for (m = mons; m; m = m->next) {
    568 				for (c = m->clients; c; c = c->next)
    569 					if (c->isfullscreen)
    570 						resizeclient(c, m->mx, m->my, m->mw, m->mh);
    571 				XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
    572 			}
    573 			focus(NULL);
    574 			arrange(NULL);
    575 		}
    576 	}
    577 }
    578 
    579 void
    580 configurerequest(XEvent *e)
    581 {
    582 	Client *c;
    583 	Monitor *m;
    584 	XConfigureRequestEvent *ev = &e->xconfigurerequest;
    585 	XWindowChanges wc;
    586 
    587 	if ((c = wintoclient(ev->window))) {
    588 		if (ev->value_mask & CWBorderWidth)
    589 			c->bw = ev->border_width;
    590 		else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
    591 			m = c->mon;
    592 			if (ev->value_mask & CWX) {
    593 				c->oldx = c->x;
    594 				c->x = m->mx + ev->x;
    595 			}
    596 			if (ev->value_mask & CWY) {
    597 				c->oldy = c->y;
    598 				c->y = m->my + ev->y;
    599 			}
    600 			if (ev->value_mask & CWWidth) {
    601 				c->oldw = c->w;
    602 				c->w = ev->width;
    603 			}
    604 			if (ev->value_mask & CWHeight) {
    605 				c->oldh = c->h;
    606 				c->h = ev->height;
    607 			}
    608 			if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
    609 				c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
    610 			if ((c->y + c->h) > m->my + m->mh && c->isfloating)
    611 				c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
    612 			if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
    613 				configure(c);
    614 			if (ISVISIBLE(c))
    615 				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
    616 		} else
    617 			configure(c);
    618 	} else {
    619 		wc.x = ev->x;
    620 		wc.y = ev->y;
    621 		wc.width = ev->width;
    622 		wc.height = ev->height;
    623 		wc.border_width = ev->border_width;
    624 		wc.sibling = ev->above;
    625 		wc.stack_mode = ev->detail;
    626 		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
    627 	}
    628 	XSync(dpy, False);
    629 }
    630 
    631 Monitor *
    632 createmon(void)
    633 {
    634 	Monitor *m;
    635 
    636 	m = ecalloc(1, sizeof(Monitor));
    637 	m->tagset[0] = m->tagset[1] = 1;
    638 	m->mfact = mfact;
    639 	m->nmaster = nmaster;
    640 	m->showbar = showbar;
    641 	m->topbar = topbar;
    642 	m->lt[0] = &layouts[0];
    643 	m->lt[1] = &layouts[1 % LENGTH(layouts)];
    644 	strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
    645 	return m;
    646 }
    647 
    648 void
    649 destroynotify(XEvent *e)
    650 {
    651 	Client *c;
    652 	XDestroyWindowEvent *ev = &e->xdestroywindow;
    653 
    654 	if ((c = wintoclient(ev->window)))
    655 		unmanage(c, 1);
    656 }
    657 
    658 void
    659 detach(Client *c)
    660 {
    661 	Client **tc;
    662 
    663 	for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
    664 	*tc = c->next;
    665 }
    666 
    667 void
    668 detachstack(Client *c)
    669 {
    670 	Client **tc, *t;
    671 
    672 	for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
    673 	*tc = c->snext;
    674 
    675 	if (c == c->mon->sel) {
    676 		for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
    677 		c->mon->sel = t;
    678 	}
    679 }
    680 
    681 Monitor *
    682 dirtomon(int dir)
    683 {
    684 	Monitor *m = NULL;
    685 
    686 	if (dir > 0) {
    687 		if (!(m = selmon->next))
    688 			m = mons;
    689 	} else if (selmon == mons)
    690 		for (m = mons; m->next; m = m->next);
    691 	else
    692 		for (m = mons; m->next != selmon; m = m->next);
    693 	return m;
    694 }
    695 
    696 void
    697 drawbar(Monitor *m)
    698 {
    699 	int x, w, tw = 0;
    700 	int boxs = drw->fonts->h / 9;
    701 	int boxw = drw->fonts->h / 6 + 2;
    702 	unsigned int i, occ = 0, urg = 0;
    703 	Client *c;
    704 
    705 	/* draw status first so it can be overdrawn by tags later */
    706 	if (m == selmon) { /* status is only drawn on selected monitor */
    707 		drw_setscheme(drw, scheme[SchemeNorm]);
    708 		tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
    709 		drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
    710 	}
    711 
    712 	for (c = m->clients; c; c = c->next) {
    713 		occ |= c->tags;
    714 		if (c->isurgent)
    715 			urg |= c->tags;
    716 	}
    717 	x = 0;
    718 	for (i = 0; i < LENGTH(tags); i++) {
    719 		w = TEXTW(tags[i]);
    720 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
    721 		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
    722 		if (occ & 1 << i)
    723 			drw_rect(drw, x + boxs, boxs, boxw, boxw,
    724 				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
    725 				urg & 1 << i);
    726 		x += w;
    727 	}
    728 	w = blw = TEXTW(m->ltsymbol);
    729 	drw_setscheme(drw, scheme[SchemeNorm]);
    730 	x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
    731 
    732 	if ((w = m->ww - tw - x) > bh) {
    733 		if (m->sel) {
    734 			drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
    735 			drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
    736 			if (m->sel->isfloating)
    737 				drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
    738 		} else {
    739 			drw_setscheme(drw, scheme[SchemeNorm]);
    740 			drw_rect(drw, x, 0, w, bh, 1, 1);
    741 		}
    742 	}
    743 	drw_map(drw, m->barwin, 0, 0, m->ww, bh);
    744 }
    745 
    746 void
    747 drawbars(void)
    748 {
    749 	Monitor *m;
    750 
    751 	for (m = mons; m; m = m->next)
    752 		drawbar(m);
    753 }
    754 
    755 void
    756 enternotify(XEvent *e)
    757 {
    758 	Client *c;
    759 	Monitor *m;
    760 	XCrossingEvent *ev = &e->xcrossing;
    761 
    762 	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
    763 		return;
    764 	c = wintoclient(ev->window);
    765 	m = c ? c->mon : wintomon(ev->window);
    766 	if (m != selmon) {
    767 		unfocus(selmon->sel, 1);
    768 		selmon = m;
    769 	} else if (!c || c == selmon->sel)
    770 		return;
    771 	focus(c);
    772 }
    773 
    774 void
    775 expose(XEvent *e)
    776 {
    777 	Monitor *m;
    778 	XExposeEvent *ev = &e->xexpose;
    779 
    780 	if (ev->count == 0 && (m = wintomon(ev->window)))
    781 		drawbar(m);
    782 }
    783 
    784 void
    785 focus(Client *c)
    786 {
    787 	if (!c || !ISVISIBLE(c))
    788 		for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
    789 	if (selmon->sel && selmon->sel != c)
    790 		unfocus(selmon->sel, 0);
    791 	if (c) {
    792 		if (c->mon != selmon)
    793 			selmon = c->mon;
    794 		if (c->isurgent)
    795 			seturgent(c, 0);
    796 		detachstack(c);
    797 		attachstack(c);
    798 		grabbuttons(c, 1);
    799 		XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
    800 		setfocus(c);
    801 	} else {
    802 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
    803 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
    804 	}
    805 	selmon->sel = c;
    806 	drawbars();
    807 }
    808 
    809 /* there are some broken focus acquiring clients needing extra handling */
    810 void
    811 focusin(XEvent *e)
    812 {
    813 	XFocusChangeEvent *ev = &e->xfocus;
    814 
    815 	if (selmon->sel && ev->window != selmon->sel->win)
    816 		setfocus(selmon->sel);
    817 }
    818 
    819 void
    820 focusmon(const Arg *arg)
    821 {
    822 	Monitor *m;
    823 
    824 	if (!mons->next)
    825 		return;
    826 	if ((m = dirtomon(arg->i)) == selmon)
    827 		return;
    828 	unfocus(selmon->sel, 0);
    829 	selmon = m;
    830 	focus(NULL);
    831 }
    832 
    833 void
    834 focusstack(const Arg *arg)
    835 {
    836 	Client *c = NULL, *i;
    837 
    838 	if (!selmon->sel)
    839 		return;
    840 	if (arg->i > 0) {
    841 		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
    842 		if (!c)
    843 			for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
    844 	} else {
    845 		for (i = selmon->clients; i != selmon->sel; i = i->next)
    846 			if (ISVISIBLE(i))
    847 				c = i;
    848 		if (!c)
    849 			for (; i; i = i->next)
    850 				if (ISVISIBLE(i))
    851 					c = i;
    852 	}
    853 	if (c) {
    854 		focus(c);
    855 		restack(selmon);
    856 	}
    857 }
    858 
    859 Atom
    860 getatomprop(Client *c, Atom prop)
    861 {
    862 	int di;
    863 	unsigned long dl;
    864 	unsigned char *p = NULL;
    865 	Atom da, atom = None;
    866 
    867 	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
    868 		&da, &di, &dl, &dl, &p) == Success && p) {
    869 		atom = *(Atom *)p;
    870 		XFree(p);
    871 	}
    872 	return atom;
    873 }
    874 
    875 int
    876 getrootptr(int *x, int *y)
    877 {
    878 	int di;
    879 	unsigned int dui;
    880 	Window dummy;
    881 
    882 	return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
    883 }
    884 
    885 long
    886 getstate(Window w)
    887 {
    888 	int format;
    889 	long result = -1;
    890 	unsigned char *p = NULL;
    891 	unsigned long n, extra;
    892 	Atom real;
    893 
    894 	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
    895 		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
    896 		return -1;
    897 	if (n != 0)
    898 		result = *p;
    899 	XFree(p);
    900 	return result;
    901 }
    902 
    903 int
    904 gettextprop(Window w, Atom atom, char *text, unsigned int size)
    905 {
    906 	char **list = NULL;
    907 	int n;
    908 	XTextProperty name;
    909 
    910 	if (!text || size == 0)
    911 		return 0;
    912 	text[0] = '\0';
    913 	if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
    914 		return 0;
    915 	if (name.encoding == XA_STRING)
    916 		strncpy(text, (char *)name.value, size - 1);
    917 	else {
    918 		if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
    919 			strncpy(text, *list, size - 1);
    920 			XFreeStringList(list);
    921 		}
    922 	}
    923 	text[size - 1] = '\0';
    924 	XFree(name.value);
    925 	return 1;
    926 }
    927 
    928 void
    929 grabbuttons(Client *c, int focused)
    930 {
    931 	updatenumlockmask();
    932 	{
    933 		unsigned int i, j;
    934 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
    935 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
    936 		if (!focused)
    937 			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
    938 				BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
    939 		for (i = 0; i < LENGTH(buttons); i++)
    940 			if (buttons[i].click == ClkClientWin)
    941 				for (j = 0; j < LENGTH(modifiers); j++)
    942 					XGrabButton(dpy, buttons[i].button,
    943 						buttons[i].mask | modifiers[j],
    944 						c->win, False, BUTTONMASK,
    945 						GrabModeAsync, GrabModeSync, None, None);
    946 	}
    947 }
    948 
    949 void
    950 grabkeys(void)
    951 {
    952 	updatenumlockmask();
    953 	{
    954 		unsigned int i, j;
    955 		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
    956 		KeyCode code;
    957 
    958 		XUngrabKey(dpy, AnyKey, AnyModifier, root);
    959 		for (i = 0; i < LENGTH(keys); i++)
    960 			if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
    961 				for (j = 0; j < LENGTH(modifiers); j++)
    962 					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
    963 						True, GrabModeAsync, GrabModeAsync);
    964 	}
    965 }
    966 
    967 void
    968 incnmaster(const Arg *arg)
    969 {
    970 	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
    971 	arrange(selmon);
    972 }
    973 
    974 #ifdef XINERAMA
    975 static int
    976 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
    977 {
    978 	while (n--)
    979 		if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
    980 		&& unique[n].width == info->width && unique[n].height == info->height)
    981 			return 0;
    982 	return 1;
    983 }
    984 #endif /* XINERAMA */
    985 
    986 void
    987 keypress(XEvent *e)
    988 {
    989 	unsigned int i;
    990 	KeySym keysym;
    991 	XKeyEvent *ev;
    992 
    993 	ev = &e->xkey;
    994 	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
    995 	for (i = 0; i < LENGTH(keys); i++)
    996 		if (keysym == keys[i].keysym
    997 		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
    998 		&& keys[i].func)
    999 			keys[i].func(&(keys[i].arg));
   1000 }
   1001 
   1002 void
   1003 killclient(const Arg *arg)
   1004 {
   1005 	if (!selmon->sel)
   1006 		return;
   1007 	if (!sendevent(selmon->sel, wmatom[WMDelete])) {
   1008 		XGrabServer(dpy);
   1009 		XSetErrorHandler(xerrordummy);
   1010 		XSetCloseDownMode(dpy, DestroyAll);
   1011 		XKillClient(dpy, selmon->sel->win);
   1012 		XSync(dpy, False);
   1013 		XSetErrorHandler(xerror);
   1014 		XUngrabServer(dpy);
   1015 	}
   1016 }
   1017 
   1018 void
   1019 manage(Window w, XWindowAttributes *wa)
   1020 {
   1021 	Client *c, *t = NULL;
   1022 	Window trans = None;
   1023 	XWindowChanges wc;
   1024 
   1025 	c = ecalloc(1, sizeof(Client));
   1026 	c->win = w;
   1027 	/* geometry */
   1028 	c->x = c->oldx = wa->x;
   1029 	c->y = c->oldy = wa->y;
   1030 	c->w = c->oldw = wa->width;
   1031 	c->h = c->oldh = wa->height;
   1032 	c->oldbw = wa->border_width;
   1033 
   1034 	updatetitle(c);
   1035 	if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
   1036 		c->mon = t->mon;
   1037 		c->tags = t->tags;
   1038 	} else {
   1039 		c->mon = selmon;
   1040 		applyrules(c);
   1041 	}
   1042 
   1043 	if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
   1044 		c->x = c->mon->mx + c->mon->mw - WIDTH(c);
   1045 	if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
   1046 		c->y = c->mon->my + c->mon->mh - HEIGHT(c);
   1047 	c->x = MAX(c->x, c->mon->mx);
   1048 	/* only fix client y-offset, if the client center might cover the bar */
   1049 	c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
   1050 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
   1051 	c->bw = borderpx;
   1052 
   1053 	wc.border_width = c->bw;
   1054 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
   1055 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
   1056 	configure(c); /* propagates border_width, if size doesn't change */
   1057 	updatewindowtype(c);
   1058 	updatesizehints(c);
   1059 	updatewmhints(c);
   1060 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
   1061 	grabbuttons(c, 0);
   1062 	if (!c->isfloating)
   1063 		c->isfloating = c->oldstate = trans != None || c->isfixed;
   1064 	if (c->isfloating)
   1065 		XRaiseWindow(dpy, c->win);
   1066 	attach(c);
   1067 	attachstack(c);
   1068 	XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
   1069 		(unsigned char *) &(c->win), 1);
   1070 	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
   1071 	setclientstate(c, NormalState);
   1072 	if (c->mon == selmon)
   1073 		unfocus(selmon->sel, 0);
   1074 	c->mon->sel = c;
   1075 	arrange(c->mon);
   1076 	XMapWindow(dpy, c->win);
   1077 	focus(NULL);
   1078 }
   1079 
   1080 void
   1081 mappingnotify(XEvent *e)
   1082 {
   1083 	XMappingEvent *ev = &e->xmapping;
   1084 
   1085 	XRefreshKeyboardMapping(ev);
   1086 	if (ev->request == MappingKeyboard)
   1087 		grabkeys();
   1088 }
   1089 
   1090 void
   1091 maprequest(XEvent *e)
   1092 {
   1093 	static XWindowAttributes wa;
   1094 	XMapRequestEvent *ev = &e->xmaprequest;
   1095 
   1096 	if (!XGetWindowAttributes(dpy, ev->window, &wa))
   1097 		return;
   1098 	if (wa.override_redirect)
   1099 		return;
   1100 	if (!wintoclient(ev->window))
   1101 		manage(ev->window, &wa);
   1102 }
   1103 
   1104 void
   1105 monocle(Monitor *m)
   1106 {
   1107 	unsigned int n = 0;
   1108 	Client *c;
   1109 
   1110 	for (c = m->clients; c; c = c->next)
   1111 		if (ISVISIBLE(c))
   1112 			n++;
   1113 	if (n > 0) /* override layout symbol */
   1114 		snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
   1115 	for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
   1116 		resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
   1117 }
   1118 
   1119 void
   1120 motionnotify(XEvent *e)
   1121 {
   1122 	static Monitor *mon = NULL;
   1123 	Monitor *m;
   1124 	XMotionEvent *ev = &e->xmotion;
   1125 
   1126 	if (ev->window != root)
   1127 		return;
   1128 	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
   1129 		unfocus(selmon->sel, 1);
   1130 		selmon = m;
   1131 		focus(NULL);
   1132 	}
   1133 	mon = m;
   1134 }
   1135 
   1136 void
   1137 movemouse(const Arg *arg)
   1138 {
   1139 	int x, y, ocx, ocy, nx, ny;
   1140 	Client *c;
   1141 	Monitor *m;
   1142 	XEvent ev;
   1143 	Time lasttime = 0;
   1144 
   1145 	if (!(c = selmon->sel))
   1146 		return;
   1147 	if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
   1148 		return;
   1149 	restack(selmon);
   1150 	ocx = c->x;
   1151 	ocy = c->y;
   1152 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1153 		None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
   1154 		return;
   1155 	if (!getrootptr(&x, &y))
   1156 		return;
   1157 	do {
   1158 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1159 		switch(ev.type) {
   1160 		case ConfigureRequest:
   1161 		case Expose:
   1162 		case MapRequest:
   1163 			handler[ev.type](&ev);
   1164 			break;
   1165 		case MotionNotify:
   1166 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1167 				continue;
   1168 			lasttime = ev.xmotion.time;
   1169 
   1170 			nx = ocx + (ev.xmotion.x - x);
   1171 			ny = ocy + (ev.xmotion.y - y);
   1172 			if (abs(selmon->wx - nx) < snap)
   1173 				nx = selmon->wx;
   1174 			else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
   1175 				nx = selmon->wx + selmon->ww - WIDTH(c);
   1176 			if (abs(selmon->wy - ny) < snap)
   1177 				ny = selmon->wy;
   1178 			else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
   1179 				ny = selmon->wy + selmon->wh - HEIGHT(c);
   1180 			if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1181 			&& (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
   1182 				togglefloating(NULL);
   1183 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1184 				resize(c, nx, ny, c->w, c->h, 1);
   1185 			break;
   1186 		}
   1187 	} while (ev.type != ButtonRelease);
   1188 	XUngrabPointer(dpy, CurrentTime);
   1189 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1190 		sendmon(c, m);
   1191 		selmon = m;
   1192 		focus(NULL);
   1193 	}
   1194 }
   1195 
   1196 Client *
   1197 nexttiled(Client *c)
   1198 {
   1199 	for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
   1200 	return c;
   1201 }
   1202 
   1203 void
   1204 pop(Client *c)
   1205 {
   1206 	detach(c);
   1207 	attach(c);
   1208 	focus(c);
   1209 	arrange(c->mon);
   1210 }
   1211 
   1212 void
   1213 propertynotify(XEvent *e)
   1214 {
   1215 	Client *c;
   1216 	Window trans;
   1217 	XPropertyEvent *ev = &e->xproperty;
   1218 
   1219 	if ((ev->window == root) && (ev->atom == XA_WM_NAME))
   1220 		updatestatus();
   1221 	else if (ev->state == PropertyDelete)
   1222 		return; /* ignore */
   1223 	else if ((c = wintoclient(ev->window))) {
   1224 		switch(ev->atom) {
   1225 		default: break;
   1226 		case XA_WM_TRANSIENT_FOR:
   1227 			if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
   1228 				(c->isfloating = (wintoclient(trans)) != NULL))
   1229 				arrange(c->mon);
   1230 			break;
   1231 		case XA_WM_NORMAL_HINTS:
   1232 			updatesizehints(c);
   1233 			break;
   1234 		case XA_WM_HINTS:
   1235 			updatewmhints(c);
   1236 			drawbars();
   1237 			break;
   1238 		}
   1239 		if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
   1240 			updatetitle(c);
   1241 			if (c == c->mon->sel)
   1242 				drawbar(c->mon);
   1243 		}
   1244 		if (ev->atom == netatom[NetWMWindowType])
   1245 			updatewindowtype(c);
   1246 	}
   1247 }
   1248 
   1249 void
   1250 quit(const Arg *arg)
   1251 {
   1252 	running = 0;
   1253 }
   1254 
   1255 Monitor *
   1256 recttomon(int x, int y, int w, int h)
   1257 {
   1258 	Monitor *m, *r = selmon;
   1259 	int a, area = 0;
   1260 
   1261 	for (m = mons; m; m = m->next)
   1262 		if ((a = INTERSECT(x, y, w, h, m)) > area) {
   1263 			area = a;
   1264 			r = m;
   1265 		}
   1266 	return r;
   1267 }
   1268 
   1269 void
   1270 resize(Client *c, int x, int y, int w, int h, int interact)
   1271 {
   1272 	if (applysizehints(c, &x, &y, &w, &h, interact))
   1273 		resizeclient(c, x, y, w, h);
   1274 }
   1275 
   1276 void
   1277 resizeclient(Client *c, int x, int y, int w, int h)
   1278 {
   1279 	XWindowChanges wc;
   1280 
   1281 	c->oldx = c->x; c->x = wc.x = x;
   1282 	c->oldy = c->y; c->y = wc.y = y;
   1283 	c->oldw = c->w; c->w = wc.width = w;
   1284 	c->oldh = c->h; c->h = wc.height = h;
   1285 	wc.border_width = c->bw;
   1286 	XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
   1287 	configure(c);
   1288 	XSync(dpy, False);
   1289 }
   1290 
   1291 void
   1292 resizemouse(const Arg *arg)
   1293 {
   1294 	int ocx, ocy, nw, nh;
   1295 	Client *c;
   1296 	Monitor *m;
   1297 	XEvent ev;
   1298 	Time lasttime = 0;
   1299 
   1300 	if (!(c = selmon->sel))
   1301 		return;
   1302 	if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
   1303 		return;
   1304 	restack(selmon);
   1305 	ocx = c->x;
   1306 	ocy = c->y;
   1307 	if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
   1308 		None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
   1309 		return;
   1310 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1311 	do {
   1312 		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
   1313 		switch(ev.type) {
   1314 		case ConfigureRequest:
   1315 		case Expose:
   1316 		case MapRequest:
   1317 			handler[ev.type](&ev);
   1318 			break;
   1319 		case MotionNotify:
   1320 			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
   1321 				continue;
   1322 			lasttime = ev.xmotion.time;
   1323 
   1324 			nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
   1325 			nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
   1326 			if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
   1327 			&& c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
   1328 			{
   1329 				if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
   1330 				&& (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
   1331 					togglefloating(NULL);
   1332 			}
   1333 			if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
   1334 				resize(c, c->x, c->y, nw, nh, 1);
   1335 			break;
   1336 		}
   1337 	} while (ev.type != ButtonRelease);
   1338 	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
   1339 	XUngrabPointer(dpy, CurrentTime);
   1340 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1341 	if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
   1342 		sendmon(c, m);
   1343 		selmon = m;
   1344 		focus(NULL);
   1345 	}
   1346 }
   1347 
   1348 void
   1349 restack(Monitor *m)
   1350 {
   1351 	Client *c;
   1352 	XEvent ev;
   1353 	XWindowChanges wc;
   1354 
   1355 	drawbar(m);
   1356 	if (!m->sel)
   1357 		return;
   1358 	if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
   1359 		XRaiseWindow(dpy, m->sel->win);
   1360 	if (m->lt[m->sellt]->arrange) {
   1361 		wc.stack_mode = Below;
   1362 		wc.sibling = m->barwin;
   1363 		for (c = m->stack; c; c = c->snext)
   1364 			if (!c->isfloating && ISVISIBLE(c)) {
   1365 				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
   1366 				wc.sibling = c->win;
   1367 			}
   1368 	}
   1369 	XSync(dpy, False);
   1370 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
   1371 }
   1372 
   1373 void
   1374 run(void)
   1375 {
   1376 	XEvent ev;
   1377 	/* main event loop */
   1378 	XSync(dpy, False);
   1379 	while (running && !XNextEvent(dpy, &ev))
   1380 		if (handler[ev.type])
   1381 			handler[ev.type](&ev); /* call handler */
   1382 }
   1383 
   1384 void
   1385 scan(void)
   1386 {
   1387 	unsigned int i, num;
   1388 	Window d1, d2, *wins = NULL;
   1389 	XWindowAttributes wa;
   1390 
   1391 	if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
   1392 		for (i = 0; i < num; i++) {
   1393 			if (!XGetWindowAttributes(dpy, wins[i], &wa)
   1394 			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
   1395 				continue;
   1396 			if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
   1397 				manage(wins[i], &wa);
   1398 		}
   1399 		for (i = 0; i < num; i++) { /* now the transients */
   1400 			if (!XGetWindowAttributes(dpy, wins[i], &wa))
   1401 				continue;
   1402 			if (XGetTransientForHint(dpy, wins[i], &d1)
   1403 			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
   1404 				manage(wins[i], &wa);
   1405 		}
   1406 		if (wins)
   1407 			XFree(wins);
   1408 	}
   1409 }
   1410 
   1411 void
   1412 sendmon(Client *c, Monitor *m)
   1413 {
   1414 	if (c->mon == m)
   1415 		return;
   1416 	unfocus(c, 1);
   1417 	detach(c);
   1418 	detachstack(c);
   1419 	c->mon = m;
   1420 	c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
   1421 	attach(c);
   1422 	attachstack(c);
   1423 	focus(NULL);
   1424 	arrange(NULL);
   1425 }
   1426 
   1427 void
   1428 setclientstate(Client *c, long state)
   1429 {
   1430 	long data[] = { state, None };
   1431 
   1432 	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
   1433 		PropModeReplace, (unsigned char *)data, 2);
   1434 }
   1435 
   1436 int
   1437 sendevent(Client *c, Atom proto)
   1438 {
   1439 	int n;
   1440 	Atom *protocols;
   1441 	int exists = 0;
   1442 	XEvent ev;
   1443 
   1444 	if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
   1445 		while (!exists && n--)
   1446 			exists = protocols[n] == proto;
   1447 		XFree(protocols);
   1448 	}
   1449 	if (exists) {
   1450 		ev.type = ClientMessage;
   1451 		ev.xclient.window = c->win;
   1452 		ev.xclient.message_type = wmatom[WMProtocols];
   1453 		ev.xclient.format = 32;
   1454 		ev.xclient.data.l[0] = proto;
   1455 		ev.xclient.data.l[1] = CurrentTime;
   1456 		XSendEvent(dpy, c->win, False, NoEventMask, &ev);
   1457 	}
   1458 	return exists;
   1459 }
   1460 
   1461 void
   1462 setfocus(Client *c)
   1463 {
   1464 	if (!c->neverfocus) {
   1465 		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
   1466 		XChangeProperty(dpy, root, netatom[NetActiveWindow],
   1467 			XA_WINDOW, 32, PropModeReplace,
   1468 			(unsigned char *) &(c->win), 1);
   1469 	}
   1470 	sendevent(c, wmatom[WMTakeFocus]);
   1471 }
   1472 
   1473 void
   1474 setfullscreen(Client *c, int fullscreen)
   1475 {
   1476 	if (fullscreen && !c->isfullscreen) {
   1477 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1478 			PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
   1479 		c->isfullscreen = 1;
   1480 		c->oldstate = c->isfloating;
   1481 		c->oldbw = c->bw;
   1482 		c->bw = 0;
   1483 		c->isfloating = 1;
   1484 		resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
   1485 		XRaiseWindow(dpy, c->win);
   1486 	} else if (!fullscreen && c->isfullscreen){
   1487 		XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
   1488 			PropModeReplace, (unsigned char*)0, 0);
   1489 		c->isfullscreen = 0;
   1490 		c->isfloating = c->oldstate;
   1491 		c->bw = c->oldbw;
   1492 		c->x = c->oldx;
   1493 		c->y = c->oldy;
   1494 		c->w = c->oldw;
   1495 		c->h = c->oldh;
   1496 		resizeclient(c, c->x, c->y, c->w, c->h);
   1497 		arrange(c->mon);
   1498 	}
   1499 }
   1500 
   1501 void
   1502 setlayout(const Arg *arg)
   1503 {
   1504 	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
   1505 		selmon->sellt ^= 1;
   1506 	if (arg && arg->v)
   1507 		selmon->lt[selmon->sellt] = (Layout *)arg->v;
   1508 	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
   1509 	if (selmon->sel)
   1510 		arrange(selmon);
   1511 	else
   1512 		drawbar(selmon);
   1513 }
   1514 
   1515 /* arg > 1.0 will set mfact absolutely */
   1516 void
   1517 setmfact(const Arg *arg)
   1518 {
   1519 	float f;
   1520 
   1521 	if (!arg || !selmon->lt[selmon->sellt]->arrange)
   1522 		return;
   1523 	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
   1524 	if (f < 0.05 || f > 0.95)
   1525 		return;
   1526 	selmon->mfact = f;
   1527 	arrange(selmon);
   1528 }
   1529 
   1530 void
   1531 setup(void)
   1532 {
   1533 	int i;
   1534 	XSetWindowAttributes wa;
   1535 	Atom utf8string;
   1536 
   1537 	/* clean up any zombies immediately */
   1538 	sigchld(0);
   1539 
   1540 	/* init screen */
   1541 	screen = DefaultScreen(dpy);
   1542 	sw = DisplayWidth(dpy, screen);
   1543 	sh = DisplayHeight(dpy, screen);
   1544 	root = RootWindow(dpy, screen);
   1545 	drw = drw_create(dpy, screen, root, sw, sh);
   1546 	if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
   1547 		die("no fonts could be loaded.");
   1548 	lrpad = drw->fonts->h;
   1549 	bh = drw->fonts->h + 2;
   1550 	updategeom();
   1551 	/* init atoms */
   1552 	utf8string = XInternAtom(dpy, "UTF8_STRING", False);
   1553 	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
   1554 	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
   1555 	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
   1556 	wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
   1557 	netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
   1558 	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
   1559 	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
   1560 	netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
   1561 	netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
   1562 	netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
   1563 	netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
   1564 	netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
   1565 	netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
   1566 	/* init cursors */
   1567 	cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
   1568 	cursor[CurResize] = drw_cur_create(drw, XC_sizing);
   1569 	cursor[CurMove] = drw_cur_create(drw, XC_fleur);
   1570 	/* init appearance */
   1571 	scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
   1572 	for (i = 0; i < LENGTH(colors); i++)
   1573 		scheme[i] = drw_scm_create(drw, colors[i], 3);
   1574 	/* init bars */
   1575 	updatebars();
   1576 	updatestatus();
   1577 	/* supporting window for NetWMCheck */
   1578 	wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
   1579 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
   1580 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1581 	XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
   1582 		PropModeReplace, (unsigned char *) "dwm", 3);
   1583 	XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
   1584 		PropModeReplace, (unsigned char *) &wmcheckwin, 1);
   1585 	/* EWMH support per view */
   1586 	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
   1587 		PropModeReplace, (unsigned char *) netatom, NetLast);
   1588 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1589 	/* select events */
   1590 	wa.cursor = cursor[CurNormal]->cursor;
   1591 	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
   1592 		|ButtonPressMask|PointerMotionMask|EnterWindowMask
   1593 		|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
   1594 	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
   1595 	XSelectInput(dpy, root, wa.event_mask);
   1596 	grabkeys();
   1597 	focus(NULL);
   1598 }
   1599 
   1600 
   1601 void
   1602 seturgent(Client *c, int urg)
   1603 {
   1604 	XWMHints *wmh;
   1605 
   1606 	c->isurgent = urg;
   1607 	if (!(wmh = XGetWMHints(dpy, c->win)))
   1608 		return;
   1609 	wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
   1610 	XSetWMHints(dpy, c->win, wmh);
   1611 	XFree(wmh);
   1612 }
   1613 
   1614 void
   1615 showhide(Client *c)
   1616 {
   1617 	if (!c)
   1618 		return;
   1619 	if (ISVISIBLE(c)) {
   1620 		/* show clients top down */
   1621 		XMoveWindow(dpy, c->win, c->x, c->y);
   1622 		if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
   1623 			resize(c, c->x, c->y, c->w, c->h, 0);
   1624 		showhide(c->snext);
   1625 	} else {
   1626 		/* hide clients bottom up */
   1627 		showhide(c->snext);
   1628 		XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
   1629 	}
   1630 }
   1631 
   1632 void
   1633 sigchld(int unused)
   1634 {
   1635 	if (signal(SIGCHLD, sigchld) == SIG_ERR)
   1636 		die("can't install SIGCHLD handler:");
   1637 	while (0 < waitpid(-1, NULL, WNOHANG));
   1638 }
   1639 
   1640 void
   1641 spawn(const Arg *arg)
   1642 {
   1643 	if (arg->v == dmenucmd)
   1644 		dmenumon[0] = '0' + selmon->num;
   1645 	if (fork() == 0) {
   1646 		if (dpy)
   1647 			close(ConnectionNumber(dpy));
   1648 		setsid();
   1649 		execvp(((char **)arg->v)[0], (char **)arg->v);
   1650 		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
   1651 		perror(" failed");
   1652 		exit(EXIT_SUCCESS);
   1653 	}
   1654 }
   1655 
   1656 void
   1657 tag(const Arg *arg)
   1658 {
   1659 	if (selmon->sel && arg->ui & TAGMASK) {
   1660 		selmon->sel->tags = arg->ui & TAGMASK;
   1661 		focus(NULL);
   1662 		arrange(selmon);
   1663 	}
   1664 }
   1665 
   1666 void
   1667 tagmon(const Arg *arg)
   1668 {
   1669 	if (!selmon->sel || !mons->next)
   1670 		return;
   1671 	sendmon(selmon->sel, dirtomon(arg->i));
   1672 }
   1673 
   1674 void
   1675 tile(Monitor *m)
   1676 {
   1677 	unsigned int i, n, h, mw, my, ty;
   1678 	Client *c;
   1679 
   1680 	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
   1681 	if (n == 0)
   1682 		return;
   1683 
   1684 	if (n > m->nmaster)
   1685 		mw = m->nmaster ? m->ww * m->mfact : 0;
   1686 	else
   1687 		mw = m->ww;
   1688 	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
   1689 		if (i < m->nmaster) {
   1690 			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
   1691 			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
   1692 			if (my + HEIGHT(c) < m->wh)
   1693 				my += HEIGHT(c);
   1694 		} else {
   1695 			h = (m->wh - ty) / (n - i);
   1696 			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
   1697 			if (ty + HEIGHT(c) < m->wh)
   1698 				ty += HEIGHT(c);
   1699 		}
   1700 }
   1701 
   1702 void
   1703 togglebar(const Arg *arg)
   1704 {
   1705 	selmon->showbar = !selmon->showbar;
   1706 	updatebarpos(selmon);
   1707 	XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
   1708 	arrange(selmon);
   1709 }
   1710 
   1711 void
   1712 togglefloating(const Arg *arg)
   1713 {
   1714 	if (!selmon->sel)
   1715 		return;
   1716 	if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
   1717 		return;
   1718 	selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
   1719 	if (selmon->sel->isfloating)
   1720 		resize(selmon->sel, selmon->sel->x, selmon->sel->y,
   1721 			selmon->sel->w, selmon->sel->h, 0);
   1722 	arrange(selmon);
   1723 }
   1724 
   1725 void
   1726 toggletag(const Arg *arg)
   1727 {
   1728 	unsigned int newtags;
   1729 
   1730 	if (!selmon->sel)
   1731 		return;
   1732 	newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
   1733 	if (newtags) {
   1734 		selmon->sel->tags = newtags;
   1735 		focus(NULL);
   1736 		arrange(selmon);
   1737 	}
   1738 }
   1739 
   1740 void
   1741 toggleview(const Arg *arg)
   1742 {
   1743 	unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
   1744 
   1745 	if (newtagset) {
   1746 		selmon->tagset[selmon->seltags] = newtagset;
   1747 		focus(NULL);
   1748 		arrange(selmon);
   1749 	}
   1750 }
   1751 
   1752 void
   1753 unfocus(Client *c, int setfocus)
   1754 {
   1755 	if (!c)
   1756 		return;
   1757 	grabbuttons(c, 0);
   1758 	XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
   1759 	if (setfocus) {
   1760 		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
   1761 		XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
   1762 	}
   1763 }
   1764 
   1765 void
   1766 unmanage(Client *c, int destroyed)
   1767 {
   1768 	Monitor *m = c->mon;
   1769 	XWindowChanges wc;
   1770 
   1771 	detach(c);
   1772 	detachstack(c);
   1773 	if (!destroyed) {
   1774 		wc.border_width = c->oldbw;
   1775 		XGrabServer(dpy); /* avoid race conditions */
   1776 		XSetErrorHandler(xerrordummy);
   1777 		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
   1778 		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
   1779 		setclientstate(c, WithdrawnState);
   1780 		XSync(dpy, False);
   1781 		XSetErrorHandler(xerror);
   1782 		XUngrabServer(dpy);
   1783 	}
   1784 	free(c);
   1785 	focus(NULL);
   1786 	updateclientlist();
   1787 	arrange(m);
   1788 }
   1789 
   1790 void
   1791 unmapnotify(XEvent *e)
   1792 {
   1793 	Client *c;
   1794 	XUnmapEvent *ev = &e->xunmap;
   1795 
   1796 	if ((c = wintoclient(ev->window))) {
   1797 		if (ev->send_event)
   1798 			setclientstate(c, WithdrawnState);
   1799 		else
   1800 			unmanage(c, 0);
   1801 	}
   1802 }
   1803 
   1804 void
   1805 updatebars(void)
   1806 {
   1807 	Monitor *m;
   1808 	XSetWindowAttributes wa = {
   1809 		.override_redirect = True,
   1810 		.background_pixmap = ParentRelative,
   1811 		.event_mask = ButtonPressMask|ExposureMask
   1812 	};
   1813 	XClassHint ch = {"dwm", "dwm"};
   1814 	for (m = mons; m; m = m->next) {
   1815 		if (m->barwin)
   1816 			continue;
   1817 		m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
   1818 				CopyFromParent, DefaultVisual(dpy, screen),
   1819 				CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
   1820 		XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
   1821 		XMapRaised(dpy, m->barwin);
   1822 		XSetClassHint(dpy, m->barwin, &ch);
   1823 	}
   1824 }
   1825 
   1826 void
   1827 updatebarpos(Monitor *m)
   1828 {
   1829 	m->wy = m->my;
   1830 	m->wh = m->mh;
   1831 	if (m->showbar) {
   1832 		m->wh -= bh;
   1833 		m->by = m->topbar ? m->wy : m->wy + m->wh;
   1834 		m->wy = m->topbar ? m->wy + bh : m->wy;
   1835 	} else
   1836 		m->by = -bh;
   1837 }
   1838 
   1839 void
   1840 updateclientlist()
   1841 {
   1842 	Client *c;
   1843 	Monitor *m;
   1844 
   1845 	XDeleteProperty(dpy, root, netatom[NetClientList]);
   1846 	for (m = mons; m; m = m->next)
   1847 		for (c = m->clients; c; c = c->next)
   1848 			XChangeProperty(dpy, root, netatom[NetClientList],
   1849 				XA_WINDOW, 32, PropModeAppend,
   1850 				(unsigned char *) &(c->win), 1);
   1851 }
   1852 
   1853 int
   1854 updategeom(void)
   1855 {
   1856 	int dirty = 0;
   1857 
   1858 #ifdef XINERAMA
   1859 	if (XineramaIsActive(dpy)) {
   1860 		int i, j, n, nn;
   1861 		Client *c;
   1862 		Monitor *m;
   1863 		XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
   1864 		XineramaScreenInfo *unique = NULL;
   1865 
   1866 		for (n = 0, m = mons; m; m = m->next, n++);
   1867 		/* only consider unique geometries as separate screens */
   1868 		unique = ecalloc(nn, sizeof(XineramaScreenInfo));
   1869 		for (i = 0, j = 0; i < nn; i++)
   1870 			if (isuniquegeom(unique, j, &info[i]))
   1871 				memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
   1872 		XFree(info);
   1873 		nn = j;
   1874 		if (n <= nn) { /* new monitors available */
   1875 			for (i = 0; i < (nn - n); i++) {
   1876 				for (m = mons; m && m->next; m = m->next);
   1877 				if (m)
   1878 					m->next = createmon();
   1879 				else
   1880 					mons = createmon();
   1881 			}
   1882 			for (i = 0, m = mons; i < nn && m; m = m->next, i++)
   1883 				if (i >= n
   1884 				|| unique[i].x_org != m->mx || unique[i].y_org != m->my
   1885 				|| unique[i].width != m->mw || unique[i].height != m->mh)
   1886 				{
   1887 					dirty = 1;
   1888 					m->num = i;
   1889 					m->mx = m->wx = unique[i].x_org;
   1890 					m->my = m->wy = unique[i].y_org;
   1891 					m->mw = m->ww = unique[i].width;
   1892 					m->mh = m->wh = unique[i].height;
   1893 					updatebarpos(m);
   1894 				}
   1895 		} else { /* less monitors available nn < n */
   1896 			for (i = nn; i < n; i++) {
   1897 				for (m = mons; m && m->next; m = m->next);
   1898 				while ((c = m->clients)) {
   1899 					dirty = 1;
   1900 					m->clients = c->next;
   1901 					detachstack(c);
   1902 					c->mon = mons;
   1903 					attach(c);
   1904 					attachstack(c);
   1905 				}
   1906 				if (m == selmon)
   1907 					selmon = mons;
   1908 				cleanupmon(m);
   1909 			}
   1910 		}
   1911 		free(unique);
   1912 	} else
   1913 #endif /* XINERAMA */
   1914 	{ /* default monitor setup */
   1915 		if (!mons)
   1916 			mons = createmon();
   1917 		if (mons->mw != sw || mons->mh != sh) {
   1918 			dirty = 1;
   1919 			mons->mw = mons->ww = sw;
   1920 			mons->mh = mons->wh = sh;
   1921 			updatebarpos(mons);
   1922 		}
   1923 	}
   1924 	if (dirty) {
   1925 		selmon = mons;
   1926 		selmon = wintomon(root);
   1927 	}
   1928 	return dirty;
   1929 }
   1930 
   1931 void
   1932 updatenumlockmask(void)
   1933 {
   1934 	unsigned int i, j;
   1935 	XModifierKeymap *modmap;
   1936 
   1937 	numlockmask = 0;
   1938 	modmap = XGetModifierMapping(dpy);
   1939 	for (i = 0; i < 8; i++)
   1940 		for (j = 0; j < modmap->max_keypermod; j++)
   1941 			if (modmap->modifiermap[i * modmap->max_keypermod + j]
   1942 				== XKeysymToKeycode(dpy, XK_Num_Lock))
   1943 				numlockmask = (1 << i);
   1944 	XFreeModifiermap(modmap);
   1945 }
   1946 
   1947 void
   1948 updatesizehints(Client *c)
   1949 {
   1950 	long msize;
   1951 	XSizeHints size;
   1952 
   1953 	if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
   1954 		/* size is uninitialized, ensure that size.flags aren't used */
   1955 		size.flags = PSize;
   1956 	if (size.flags & PBaseSize) {
   1957 		c->basew = size.base_width;
   1958 		c->baseh = size.base_height;
   1959 	} else if (size.flags & PMinSize) {
   1960 		c->basew = size.min_width;
   1961 		c->baseh = size.min_height;
   1962 	} else
   1963 		c->basew = c->baseh = 0;
   1964 	if (size.flags & PResizeInc) {
   1965 		c->incw = size.width_inc;
   1966 		c->inch = size.height_inc;
   1967 	} else
   1968 		c->incw = c->inch = 0;
   1969 	if (size.flags & PMaxSize) {
   1970 		c->maxw = size.max_width;
   1971 		c->maxh = size.max_height;
   1972 	} else
   1973 		c->maxw = c->maxh = 0;
   1974 	if (size.flags & PMinSize) {
   1975 		c->minw = size.min_width;
   1976 		c->minh = size.min_height;
   1977 	} else if (size.flags & PBaseSize) {
   1978 		c->minw = size.base_width;
   1979 		c->minh = size.base_height;
   1980 	} else
   1981 		c->minw = c->minh = 0;
   1982 	if (size.flags & PAspect) {
   1983 		c->mina = (float)size.min_aspect.y / size.min_aspect.x;
   1984 		c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
   1985 	} else
   1986 		c->maxa = c->mina = 0.0;
   1987 	c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
   1988 }
   1989 
   1990 void
   1991 updatestatus(void)
   1992 {
   1993 	if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
   1994 		strcpy(stext, "dwm-"VERSION);
   1995 	drawbar(selmon);
   1996 }
   1997 
   1998 void
   1999 updatetitle(Client *c)
   2000 {
   2001 	if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
   2002 		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
   2003 	if (c->name[0] == '\0') /* hack to mark broken clients */
   2004 		strcpy(c->name, broken);
   2005 }
   2006 
   2007 void
   2008 updatewindowtype(Client *c)
   2009 {
   2010 	Atom state = getatomprop(c, netatom[NetWMState]);
   2011 	Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
   2012 
   2013 	if (state == netatom[NetWMFullscreen])
   2014 		setfullscreen(c, 1);
   2015 	if (wtype == netatom[NetWMWindowTypeDialog])
   2016 		c->isfloating = 1;
   2017 }
   2018 
   2019 void
   2020 updatewmhints(Client *c)
   2021 {
   2022 	XWMHints *wmh;
   2023 
   2024 	if ((wmh = XGetWMHints(dpy, c->win))) {
   2025 		if (c == selmon->sel && wmh->flags & XUrgencyHint) {
   2026 			wmh->flags &= ~XUrgencyHint;
   2027 			XSetWMHints(dpy, c->win, wmh);
   2028 		} else
   2029 			c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
   2030 		if (wmh->flags & InputHint)
   2031 			c->neverfocus = !wmh->input;
   2032 		else
   2033 			c->neverfocus = 0;
   2034 		XFree(wmh);
   2035 	}
   2036 }
   2037 
   2038 void
   2039 view(const Arg *arg)
   2040 {
   2041 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
   2042 		return;
   2043 	selmon->seltags ^= 1; /* toggle sel tagset */
   2044 	if (arg->ui & TAGMASK)
   2045 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
   2046 	focus(NULL);
   2047 	arrange(selmon);
   2048 }
   2049 
   2050 Client *
   2051 wintoclient(Window w)
   2052 {
   2053 	Client *c;
   2054 	Monitor *m;
   2055 
   2056 	for (m = mons; m; m = m->next)
   2057 		for (c = m->clients; c; c = c->next)
   2058 			if (c->win == w)
   2059 				return c;
   2060 	return NULL;
   2061 }
   2062 
   2063 Monitor *
   2064 wintomon(Window w)
   2065 {
   2066 	int x, y;
   2067 	Client *c;
   2068 	Monitor *m;
   2069 
   2070 	if (w == root && getrootptr(&x, &y))
   2071 		return recttomon(x, y, 1, 1);
   2072 	for (m = mons; m; m = m->next)
   2073 		if (w == m->barwin)
   2074 			return m;
   2075 	if ((c = wintoclient(w)))
   2076 		return c->mon;
   2077 	return selmon;
   2078 }
   2079 
   2080 /* There's no way to check accesses to destroyed windows, thus those cases are
   2081  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
   2082  * default error handler, which may call exit. */
   2083 int
   2084 xerror(Display *dpy, XErrorEvent *ee)
   2085 {
   2086 	if (ee->error_code == BadWindow
   2087 	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
   2088 	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
   2089 	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
   2090 	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
   2091 	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
   2092 	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
   2093 	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
   2094 	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
   2095 		return 0;
   2096 	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
   2097 		ee->request_code, ee->error_code);
   2098 	return xerrorxlib(dpy, ee); /* may call exit */
   2099 }
   2100 
   2101 int
   2102 xerrordummy(Display *dpy, XErrorEvent *ee)
   2103 {
   2104 	return 0;
   2105 }
   2106 
   2107 /* Startup Error handler to check if another window manager
   2108  * is already running. */
   2109 int
   2110 xerrorstart(Display *dpy, XErrorEvent *ee)
   2111 {
   2112 	die("dwm: another window manager is already running");
   2113 	return -1;
   2114 }
   2115 
   2116 void
   2117 zoom(const Arg *arg)
   2118 {
   2119 	Client *c = selmon->sel;
   2120 
   2121 	if (!selmon->lt[selmon->sellt]->arrange
   2122 	|| (selmon->sel && selmon->sel->isfloating))
   2123 		return;
   2124 	if (c == nexttiled(selmon->clients))
   2125 		if (!c || !(c = nexttiled(c->next)))
   2126 			return;
   2127 	pop(c);
   2128 }
   2129 
   2130 int
   2131 main(int argc, char *argv[])
   2132 {
   2133 	if (argc == 2 && !strcmp("-v", argv[1]))
   2134 		die("dwm-"VERSION);
   2135 	else if (argc != 1)
   2136 		die("usage: dwm [-v]");
   2137 	if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
   2138 		fputs("warning: no locale support\n", stderr);
   2139 	if (!(dpy = XOpenDisplay(NULL)))
   2140 		die("dwm: cannot open display");
   2141 	checkotherwm();
   2142 	setup();
   2143 #ifdef __OpenBSD__
   2144 	if (pledge("stdio rpath proc exec", NULL) == -1)
   2145 		die("pledge");
   2146 #endif /* __OpenBSD__ */
   2147 	scan();
   2148 	run();
   2149 	cleanup();
   2150 	XCloseDisplay(dpy);
   2151 	return EXIT_SUCCESS;
   2152 }