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 * Calls to fetch an X event from the event queue are blocking.  Due reading
  10 * status text from standard input, a select()-driven main loop has been
  11 * implemented which selects for reads on the X connection and STDIN_FILENO to
  12 * handle all data smoothly. The event handlers of dwm are organized in an
  13 * array which is accessed whenever a new event has been fetched. This allows
  14 * event dispatching in O(1) time.
  15 *
  16 * Each child of the root window is called a client, except windows which have
  17 * set the override_redirect flag.  Clients are organized in a global
  18 * doubly-linked client list, the focus history is remembered through a global
  19 * stack list. Each client contains an array of Bools of the same size as the
  20 * global tags array to indicate the tags of a client.  
  21 *
  22 * Keys and tagging rules are organized as arrays and defined in config.h.
  23 *
  24 * To understand everything else, start reading main().
  25 */
  26#include <errno.h>
  27#include <locale.h>
  28#include <stdarg.h>
  29#include <stdio.h>
  30#include <stdlib.h>
  31#include <string.h>
  32#include <unistd.h>
  33#include <sys/select.h>
  34#include <sys/types.h>
  35#include <sys/wait.h>
  36#include <regex.h>
  37#include <X11/cursorfont.h>
  38#include <X11/keysym.h>
  39#include <X11/Xatom.h>
  40#include <X11/Xlib.h>
  41#include <X11/Xproto.h>
  42#include <X11/Xutil.h>
  43//#ifdef XINERAMA
  44#include <X11/extensions/Xinerama.h>
  45//#endif
  46
  47/* macros */
  48#define BUTTONMASK		(ButtonPressMask | ButtonReleaseMask)
  49#define CLEANMASK(mask)		(mask & ~(numlockmask | LockMask))
  50#define LENGTH(x)		(sizeof x / sizeof x[0])
  51#define MAXTAGLEN		16
  52#define MOUSEMASK		(BUTTONMASK | PointerMotionMask)
  53
  54
  55/* enums */
  56enum { BarTop, BarBot, BarOff };			/* bar position */
  57enum { CurNormal, CurResize, CurMove, CurLast };	/* cursor */
  58enum { ColBorder, ColFG, ColBG, ColLast };		/* color */
  59enum { NetSupported, NetWMName, NetLast };		/* EWMH atoms */
  60enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
  61
  62/* typedefs */
  63typedef struct Monitor Monitor;
  64typedef struct Client Client;
  65struct Client {
  66	char name[256];
  67	int x, y, w, h;
  68	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  69	int minax, maxax, minay, maxay;
  70	long flags;
  71	unsigned int border, oldborder;
  72	Bool isbanned, isfixed, isfloating, isurgent;
  73	Bool *tags;
  74	Client *next;
  75	Client *prev;
  76	Client *snext;
  77	Window win;
  78	Monitor *monitor;
  79};
  80
  81typedef struct {
  82	int x, y, w, h;
  83	unsigned long norm[ColLast];
  84	unsigned long sel[ColLast];
  85	Drawable drawable;
  86	GC gc;
  87	struct {
  88		int ascent;
  89		int descent;
  90		int height;
  91		XFontSet set;
  92		XFontStruct *xfont;
  93	} font;
  94} DC; /* draw context */
  95
  96typedef struct {
  97	unsigned long mod;
  98	KeySym keysym;
  99	void (*func)(const char *arg);
 100	const char *arg;
 101} Key;
 102
 103typedef struct {
 104	const char *symbol;
 105	void (*arrange)(Monitor *);
 106} Layout;
 107
 108typedef struct {
 109	const char *prop;
 110	const char *tags;
 111	Bool isfloating;
 112	int monitor;
 113} Rule;
 114
 115typedef struct {
 116	regex_t *propregex;
 117	regex_t *tagregex;
 118} Regs;
 119
 120struct Monitor {
 121	int sx, sy, sw, sh, wax, way, wah, waw;
 122	double mwfact;
 123	Bool *seltags;
 124	Bool *prevtags;
 125	Layout *layout;
 126	Window barwin;
 127};
 128
 129
 130/* function declarations */
 131void applyrules(Client *c);
 132void arrange(Monitor *m);
 133void attach(Client *c);
 134void attachstack(Client *c);
 135void ban(Client *c);
 136void buttonpress(XEvent *e);
 137void checkotherwm(void);
 138void cleanup(void);
 139void compileregs(void);
 140void configure(Client *c);
 141void configurenotify(XEvent *e);
 142void configurerequest(XEvent *e);
 143void destroynotify(XEvent *e);
 144void detach(Client *c);
 145void detachstack(Client *c);
 146void drawbar(Monitor *m);
 147void drawsquare(Monitor *m, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 148void drawtext(Monitor *m, const char *text, unsigned long col[ColLast], Bool invert);
 149void *emallocz(unsigned int size);
 150void enternotify(XEvent *e);
 151void eprint(const char *errstr, ...);
 152void expose(XEvent *e);
 153void floating(Monitor *m); /* default floating layout */
 154void focus(Client *c);
 155void focusin(XEvent *e);
 156void focusnext(const char *arg);
 157void focusprev(const char *arg);
 158Client *getclient(Window w);
 159unsigned long getcolor(const char *colstr);
 160Monitor *getmonitor(Window barwin);
 161long getstate(Window w);
 162Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 163void grabbuttons(Client *c, Bool focused);
 164void grabkeys(void);
 165unsigned int idxoftag(const char *tag);
 166void initfont(const char *fontstr);
 167Bool isoccupied(Monitor *monitor, unsigned int t);
 168Bool isprotodel(Client *c);
 169Bool isurgent(Monitor *monitor, unsigned int t);
 170Bool isvisible(Client *c, Monitor *m);
 171void keypress(XEvent *e);
 172void killclient(const char *arg);
 173void manage(Window w, XWindowAttributes *wa);
 174void mappingnotify(XEvent *e);
 175void maprequest(XEvent *e);
 176Monitor *monitorat(void);
 177void movemouse(Client *c);
 178Client *nexttiled(Client *c, Monitor *monitor);
 179void propertynotify(XEvent *e);
 180void quit(const char *arg);
 181void reapply(const char *arg);
 182void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 183void resizemouse(Client *c);
 184void restack(Monitor *m);
 185void run(void);
 186void scan(void);
 187void setclientstate(Client *c, long state);
 188void setlayout(const char *arg);
 189void setmwfact(const char *arg);
 190void setup(void);
 191void spawn(const char *arg);
 192void tag(const char *arg);
 193unsigned int textnw(const char *text, unsigned int len);
 194unsigned int textw(const char *text);
 195void tile(Monitor *m);
 196void togglebar(const char *arg);
 197void togglefloating(const char *arg);
 198void toggletag(const char *arg);
 199void toggleview(const char *arg);
 200void unban(Client *c);
 201void unmanage(Client *c);
 202void unmapnotify(XEvent *e);
 203void updatebarpos(Monitor *m);
 204void updatesizehints(Client *c);
 205void updatetitle(Client *c);
 206void updatewmhints(Client *c);
 207void view(const char *arg);
 208void viewprevtag(const char *arg);	/* views previous selected tags */
 209int xerror(Display *dpy, XErrorEvent *ee);
 210int xerrordummy(Display *dsply, XErrorEvent *ee);
 211int xerrorstart(Display *dsply, XErrorEvent *ee);
 212void zoom(const char *arg);
 213void movetomonitor(const char *arg);
 214void selectmonitor(const char *arg);
 215
 216/* variables */
 217char stext[256];
 218int mcount = 1;
 219Monitor *selmonitor;
 220int screen;
 221int (*xerrorxlib)(Display *, XErrorEvent *);
 222unsigned int bh, bpos;
 223unsigned int blw = 0;
 224unsigned int numlockmask = 0;
 225void (*handler[LASTEvent]) (XEvent *) = {
 226	[ButtonPress] = buttonpress,
 227	[ConfigureRequest] = configurerequest,
 228	[ConfigureNotify] = configurenotify,
 229	[DestroyNotify] = destroynotify,
 230	[EnterNotify] = enternotify,
 231	[Expose] = expose,
 232	[FocusIn] = focusin,
 233	[KeyPress] = keypress,
 234	[MappingNotify] = mappingnotify,
 235	[MapRequest] = maprequest,
 236	[PropertyNotify] = propertynotify,
 237	[UnmapNotify] = unmapnotify
 238};
 239Atom wmatom[WMLast], netatom[NetLast];
 240Bool isxinerama = False;
 241Bool domwfact = True;
 242Bool dozoom = True;
 243Bool otherwm, readin;
 244Bool running = True;
 245Client *clients = NULL;
 246Client *sel = NULL;
 247Client *stack = NULL;
 248Cursor cursor[CurLast];
 249Display *dpy;
 250DC dc = {0};
 251Regs *regs = NULL;
 252Monitor *monitors;
 253Window root;
 254
 255/* configuration, allows nested code to access above variables */
 256#include "config.h"
 257
 258//Bool prevtags[LENGTH(tags)];
 259
 260/* function implementations */
 261void
 262applyrules(Client *c) {
 263	static char buf[512];
 264	unsigned int i, j;
 265	regmatch_t tmp;
 266	Bool matched_tag = False;
 267	Bool matched_monitor = False;
 268	XClassHint ch = { 0 };
 269
 270	/* rule matching */
 271	XGetClassHint(dpy, c->win, &ch);
 272	snprintf(buf, sizeof buf, "%s:%s:%s",
 273			ch.res_class ? ch.res_class : "",
 274			ch.res_name ? ch.res_name : "", c->name);
 275	for(i = 0; i < LENGTH(rules); i++)
 276		if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
 277			if (rules[i].monitor >= 0 && rules[i].monitor < mcount) {
 278				matched_monitor = True;
 279				c->monitor = &monitors[rules[i].monitor];
 280			}
 281
 282			c->isfloating = rules[i].isfloating;
 283			for(j = 0; regs[i].tagregex && j < LENGTH(tags); j++) {
 284				if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
 285					matched_tag = True;
 286					c->tags[j] = True;
 287				}
 288			}
 289		}
 290	if(ch.res_class)
 291		XFree(ch.res_class);
 292	if(ch.res_name)
 293		XFree(ch.res_name);
 294	if(!matched_tag)
 295		memcpy(c->tags, monitorat()->seltags, sizeof initags);
 296	if (!matched_monitor)
 297		c->monitor = monitorat();
 298}
 299
 300void
 301arrange(Monitor *m) {
 302	unsigned int i;
 303	Client *c;
 304
 305	for(c = clients; c; c = c->next)
 306		if(isvisible(c, c->monitor))
 307			unban(c);
 308		else
 309			ban(c);
 310
 311	if(m)
 312		m->layout->arrange(m);
 313	else
 314		for(i = 0; i < mcount; i++)
 315			monitors[i].layout->arrange(&monitors[i]);
 316	focus(NULL);
 317	restack(m);
 318}
 319
 320void
 321attach(Client *c) {
 322	if(clients)
 323		clients->prev = c;
 324	c->next = clients;
 325	clients = c;
 326}
 327
 328void
 329attachstack(Client *c) {
 330	c->snext = stack;
 331	stack = c;
 332}
 333
 334void
 335ban(Client *c) {
 336	if(c->isbanned)
 337		return;
 338	XMoveWindow(dpy, c->win, c->x + 3 * c->monitor->sw, c->y);
 339	c->isbanned = True;
 340}
 341
 342void
 343buttonpress(XEvent *e) {
 344	unsigned int i, x;
 345	Client *c;
 346	XButtonPressedEvent *ev = &e->xbutton;
 347
 348	Monitor *m = monitorat();
 349
 350	if(ev->window == m->barwin) {
 351		x = 0;
 352		for(i = 0; i < LENGTH(tags); i++) {
 353			x += textw(tags[i]);
 354			if(ev->x < x) {
 355				if(ev->button == Button1) {
 356					if(ev->state & MODKEY)
 357						tag(tags[i]);
 358					else
 359						view(tags[i]);
 360				}
 361				else if(ev->button == Button3) {
 362					if(ev->state & MODKEY)
 363						toggletag(tags[i]);
 364					else
 365						toggleview(tags[i]);
 366				}
 367				return;
 368			}
 369		}
 370		if((ev->x < x + blw) && ev->button == Button1)
 371			setlayout(NULL);
 372	}
 373	else if((c = getclient(ev->window))) {
 374		focus(c);
 375		if(CLEANMASK(ev->state) != MODKEY)
 376			return;
 377		if(ev->button == Button1) {
 378			restack(c->monitor);
 379			movemouse(c);
 380		}
 381		else if(ev->button == Button2) {
 382			if((floating != m->layout->arrange) && c->isfloating)
 383				togglefloating(NULL);
 384			else
 385				zoom(NULL);
 386		}
 387		else if(ev->button == Button3 && !c->isfixed) {
 388			restack(c->monitor);
 389			resizemouse(c);
 390		}
 391	}
 392}
 393
 394void
 395checkotherwm(void) {
 396	otherwm = False;
 397	XSetErrorHandler(xerrorstart);
 398
 399	/* this causes an error if some other window manager is running */
 400	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 401	XSync(dpy, False);
 402	if(otherwm)
 403		eprint("dwm: another window manager is already running\n");
 404	XSync(dpy, False);
 405	XSetErrorHandler(NULL);
 406	xerrorxlib = XSetErrorHandler(xerror);
 407	XSync(dpy, False);
 408}
 409
 410void
 411cleanup(void) {
 412	unsigned int i;
 413	close(STDIN_FILENO);
 414	while(stack) {
 415		unban(stack);
 416		unmanage(stack);
 417	}
 418	if(dc.font.set)
 419		XFreeFontSet(dpy, dc.font.set);
 420	else
 421		XFreeFont(dpy, dc.font.xfont);
 422
 423	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 424	XFreePixmap(dpy, dc.drawable);
 425	XFreeGC(dpy, dc.gc);
 426	XFreeCursor(dpy, cursor[CurNormal]);
 427	XFreeCursor(dpy, cursor[CurResize]);
 428	XFreeCursor(dpy, cursor[CurMove]);
 429	for(i = 0; i < mcount; i++)
 430		XDestroyWindow(dpy, monitors[i].barwin);
 431	XSync(dpy, False);
 432	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 433}
 434
 435void
 436compileregs(void) {
 437	unsigned int i;
 438	regex_t *reg;
 439
 440	if(regs)
 441		return;
 442	regs = emallocz(LENGTH(rules) * sizeof(Regs));
 443	for(i = 0; i < LENGTH(rules); i++) {
 444		if(rules[i].prop) {
 445			reg = emallocz(sizeof(regex_t));
 446			if(regcomp(reg, rules[i].prop, REG_EXTENDED))
 447				free(reg);
 448			else
 449				regs[i].propregex = reg;
 450		}
 451		if(rules[i].tags) {
 452			reg = emallocz(sizeof(regex_t));
 453			if(regcomp(reg, rules[i].tags, REG_EXTENDED))
 454				free(reg);
 455			else
 456				regs[i].tagregex = reg;
 457		}
 458	}
 459}
 460
 461void
 462configure(Client *c) {
 463	XConfigureEvent ce;
 464
 465	ce.type = ConfigureNotify;
 466	ce.display = dpy;
 467	ce.event = c->win;
 468	ce.window = c->win;
 469	ce.x = c->x;
 470	ce.y = c->y;
 471	ce.width = c->w;
 472	ce.height = c->h;
 473	ce.border_width = c->border;
 474	ce.above = None;
 475	ce.override_redirect = False;
 476	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 477}
 478
 479void
 480configurenotify(XEvent *e) {
 481	XConfigureEvent *ev = &e->xconfigure;
 482	Monitor *m = selmonitor;
 483
 484	if(ev->window == root && (ev->width != m->sw || ev->height != m->sh)) {
 485		/* TODO -- update Xinerama dimensions here */
 486		m->sw = ev->width;
 487		m->sh = ev->height;
 488		XFreePixmap(dpy, dc.drawable);
 489		dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(root, screen), bh, DefaultDepth(dpy, screen));
 490		XResizeWindow(dpy, m->barwin, m->sw, bh);
 491		updatebarpos(m);
 492		arrange(m);
 493	}
 494}
 495
 496void
 497configurerequest(XEvent *e) {
 498	Client *c;
 499	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 500	XWindowChanges wc;
 501
 502	if((c = getclient(ev->window))) {
 503		Monitor *m = c->monitor;
 504		if(ev->value_mask & CWBorderWidth)
 505			c->border = ev->border_width;
 506		if(c->isfixed || c->isfloating || (floating == m->layout->arrange)) {
 507			if(ev->value_mask & CWX)
 508				c->x = m->sx+ev->x;
 509			if(ev->value_mask & CWY)
 510				c->y = m->sy+ev->y;
 511			if(ev->value_mask & CWWidth)
 512				c->w = ev->width;
 513			if(ev->value_mask & CWHeight)
 514				c->h = ev->height;
 515			if((c->x - m->sx + c->w) > m->sw && c->isfloating)
 516				c->x = m->sx + (m->sw / 2 - c->w / 2); /* center in x direction */
 517			if((c->y - m->sy + c->h) > m->sh && c->isfloating)
 518				c->y = m->sy + (m->sh / 2 - c->h / 2); /* center in y direction */
 519			if((ev->value_mask & (CWX | CWY))
 520			&& !(ev->value_mask & (CWWidth | CWHeight)))
 521				configure(c);
 522			if(isvisible(c, monitorat()))
 523				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 524		}
 525		else
 526			configure(c);
 527	}
 528	else {
 529		wc.x = ev->x;
 530		wc.y = ev->y;
 531		wc.width = ev->width;
 532		wc.height = ev->height;
 533		wc.border_width = ev->border_width;
 534		wc.sibling = ev->above;
 535		wc.stack_mode = ev->detail;
 536		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 537	}
 538	XSync(dpy, False);
 539}
 540
 541void
 542destroynotify(XEvent *e) {
 543	Client *c;
 544	XDestroyWindowEvent *ev = &e->xdestroywindow;
 545
 546	if((c = getclient(ev->window)))
 547		unmanage(c);
 548}
 549
 550void
 551detach(Client *c) {
 552	if(c->prev)
 553		c->prev->next = c->next;
 554	if(c->next)
 555		c->next->prev = c->prev;
 556	if(c == clients)
 557		clients = c->next;
 558	c->next = c->prev = NULL;
 559}
 560
 561void
 562detachstack(Client *c) {
 563	Client **tc;
 564
 565	for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 566	*tc = c->snext;
 567}
 568
 569void
 570drawbar(Monitor *m) {
 571	int j, x;
 572	Client *c;
 573
 574	dc.x = 0;
 575	for(c = stack; c && !isvisible(c, m); c = c->snext);
 576	for(j = 0; j < LENGTH(tags); j++) {
 577		dc.w = textw(tags[j]);
 578		if(m->seltags[j]) {
 579			drawtext(m, tags[j], dc.sel, isurgent(m, j));
 580			drawsquare(m, c && c->tags[j] && c->monitor == m,
 581					isoccupied(m, j), isurgent(m, j), dc.sel);
 582		}
 583		else {
 584			drawtext(m, tags[j], dc.norm, isurgent(m, j));
 585			drawsquare(m, c && c->tags[j] && c->monitor == m,
 586					isoccupied(m, j), isurgent(m, j), dc.norm);
 587		}
 588		dc.x += dc.w;
 589	}
 590	dc.w = blw;
 591	drawtext(m, m->layout->symbol, dc.norm, False);
 592	x = dc.x + dc.w;
 593	if(m == selmonitor) {
 594		dc.w = textw(stext);
 595		dc.x = m->sw - dc.w;
 596		if(dc.x < x) {
 597			dc.x = x;
 598			dc.w = m->sw - x;
 599		}
 600		drawtext(m, stext, dc.norm, False);
 601	}
 602	else
 603		dc.x = m->sw;
 604	if((dc.w = dc.x - x) > bh) {
 605		dc.x = x;
 606		if(c) {
 607			drawtext(m, c->name, dc.sel, False);
 608			drawsquare(m, False, c->isfloating, False, dc.sel);
 609		}
 610		else
 611			drawtext(m, NULL, dc.norm, False);
 612	}
 613	XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->sw, bh, 0, 0);
 614	XSync(dpy, False);
 615}
 616
 617void
 618drawsquare(Monitor *m, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 619	int x;
 620	XGCValues gcv;
 621	XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 622
 623	gcv.foreground = col[invert ? ColBG : ColFG];
 624	XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 625	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 626	r.x = dc.x + 1;
 627	r.y = dc.y + 1;
 628	if(filled) {
 629		r.width = r.height = x + 1;
 630		XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 631	}
 632	else if(empty) {
 633		r.width = r.height = x;
 634		XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 635	}
 636}
 637
 638void
 639drawtext(Monitor *m, const char *text, unsigned long col[ColLast], Bool invert) {
 640	int x, y, w, h;
 641	static char buf[256];
 642	unsigned int len, olen;
 643	XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 644
 645	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 646	XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 647	if(!text)
 648		return;
 649	w = 0;
 650	olen = len = strlen(text);
 651	if(len >= sizeof buf)
 652		len = sizeof buf - 1;
 653	memcpy(buf, text, len);
 654	buf[len] = 0;
 655	h = dc.font.ascent + dc.font.descent;
 656	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 657	x = dc.x + (h / 2);
 658	/* shorten text if necessary */
 659	while(len && (w = textnw(buf, len)) > dc.w - h)
 660		buf[--len] = 0;
 661	if(len < olen) {
 662		if(len > 1)
 663			buf[len - 1] = '.';
 664		if(len > 2)
 665			buf[len - 2] = '.';
 666		if(len > 3)
 667			buf[len - 3] = '.';
 668	}
 669	if(w > dc.w)
 670		return; /* too long */
 671	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 672	if(dc.font.set)
 673		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 674	else
 675		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 676}
 677
 678void *
 679emallocz(unsigned int size) {
 680	void *res = calloc(1, size);
 681
 682	if(!res)
 683		eprint("fatal: could not malloc() %u bytes\n", size);
 684	return res;
 685}
 686
 687void
 688enternotify(XEvent *e) {
 689	Client *c;
 690	XCrossingEvent *ev = &e->xcrossing;
 691
 692	if(ev->mode != NotifyNormal || ev->detail == NotifyInferior) {
 693		if(!isxinerama || ev->window != root)
 694			return;
 695	}
 696	if((c = getclient(ev->window)))
 697		focus(c);
 698	else {
 699		selmonitor = monitorat();
 700		fprintf(stderr, "updating selmonitor %d\n", selmonitor - monitors);
 701		focus(NULL);
 702	}
 703}
 704
 705void
 706eprint(const char *errstr, ...) {
 707	va_list ap;
 708
 709	va_start(ap, errstr);
 710	vfprintf(stderr, errstr, ap);
 711	va_end(ap);
 712	exit(EXIT_FAILURE);
 713}
 714
 715void
 716expose(XEvent *e) {
 717	Monitor *m;
 718	XExposeEvent *ev = &e->xexpose;
 719
 720	if(ev->count == 0 && (m = getmonitor(ev->window)))
 721		drawbar(m);
 722}
 723
 724void
 725floating(Monitor *m) { /* default floating layout */
 726	Client *c;
 727
 728	domwfact = dozoom = False;
 729	for(c = clients; c; c = c->next)
 730		if(isvisible(c, m))
 731			resize(c, c->x, c->y, c->w, c->h, True);
 732}
 733
 734void
 735focus(Client *c) {
 736	if(c)
 737		selmonitor = c->monitor;
 738	if(!c || (c && !isvisible(c, selmonitor)))
 739		for(c = stack; c && !isvisible(c, c->monitor); c = c->snext);
 740	if(sel && sel != c) {
 741		grabbuttons(sel, False);
 742		XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 743	}
 744	if(c) {
 745		detachstack(c);
 746		attachstack(c);
 747		grabbuttons(c, True);
 748	}
 749	sel = c;
 750	if(c) {
 751		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 752		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 753		selmonitor = c->monitor;
 754	}
 755	else
 756		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 757	drawbar(selmonitor);
 758}
 759
 760void
 761focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 762	XFocusChangeEvent *ev = &e->xfocus;
 763
 764	if(sel && ev->window != sel->win)
 765		XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 766}
 767
 768void
 769focusnext(const char *arg) {
 770	Client *c;
 771
 772	if(!sel)
 773		return;
 774	for(c = sel->next; c && !isvisible(c, selmonitor); c = c->next);
 775	if(!c)
 776		for(c = clients; c && !isvisible(c, selmonitor); c = c->next);
 777	if(c) {
 778		focus(c);
 779		restack(c->monitor);
 780	}
 781}
 782
 783void
 784focusprev(const char *arg) {
 785	Client *c;
 786
 787	if(!sel)
 788		return;
 789	for(c = sel->prev; c && !isvisible(c, selmonitor); c = c->prev);
 790	if(!c) {
 791		for(c = clients; c && c->next; c = c->next);
 792		for(; c && !isvisible(c, selmonitor); c = c->prev);
 793	}
 794	if(c) {
 795		focus(c);
 796		restack(c->monitor);
 797	}
 798}
 799
 800Client *
 801getclient(Window w) {
 802	Client *c;
 803
 804	for(c = clients; c && c->win != w; c = c->next);
 805	return c;
 806}
 807
 808unsigned long
 809getcolor(const char *colstr) {
 810	Colormap cmap = DefaultColormap(dpy, screen);
 811	XColor color;
 812
 813	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 814		eprint("error, cannot allocate color '%s'\n", colstr);
 815	return color.pixel;
 816}
 817
 818Monitor *
 819getmonitor(Window barwin) {
 820	unsigned int i;
 821
 822	for(i = 0; i < mcount; i++)
 823		if(monitors[i].barwin == barwin)
 824			return &monitors[i];
 825	return NULL;
 826}
 827
 828long
 829getstate(Window w) {
 830	int format, status;
 831	long result = -1;
 832	unsigned char *p = NULL;
 833	unsigned long n, extra;
 834	Atom real;
 835
 836	status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 837			&real, &format, &n, &extra, (unsigned char **)&p);
 838	if(status != Success)
 839		return -1;
 840	if(n != 0)
 841		result = *p;
 842	XFree(p);
 843	return result;
 844}
 845
 846Bool
 847gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 848	char **list = NULL;
 849	int n;
 850	XTextProperty name;
 851
 852	if(!text || size == 0)
 853		return False;
 854	text[0] = '\0';
 855	XGetTextProperty(dpy, w, &name, atom);
 856	if(!name.nitems)
 857		return False;
 858	if(name.encoding == XA_STRING)
 859		strncpy(text, (char *)name.value, size - 1);
 860	else {
 861		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 862		&& n > 0 && *list) {
 863			strncpy(text, *list, size - 1);
 864			XFreeStringList(list);
 865		}
 866	}
 867	text[size - 1] = '\0';
 868	XFree(name.value);
 869	return True;
 870}
 871
 872void
 873grabbuttons(Client *c, Bool focused) {
 874	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 875
 876	if(focused) {
 877		XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 878				GrabModeAsync, GrabModeSync, None, None);
 879		XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
 880				GrabModeAsync, GrabModeSync, None, None);
 881		XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 882				GrabModeAsync, GrabModeSync, None, None);
 883		XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 884				GrabModeAsync, GrabModeSync, None, None);
 885
 886		XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 887				GrabModeAsync, GrabModeSync, None, None);
 888		XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
 889				GrabModeAsync, GrabModeSync, None, None);
 890		XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 891				GrabModeAsync, GrabModeSync, None, None);
 892		XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 893				GrabModeAsync, GrabModeSync, None, None);
 894
 895		XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 896				GrabModeAsync, GrabModeSync, None, None);
 897		XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
 898				GrabModeAsync, GrabModeSync, None, None);
 899		XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 900				GrabModeAsync, GrabModeSync, None, None);
 901		XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 902				GrabModeAsync, GrabModeSync, None, None);
 903	}
 904	else
 905		XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 906				GrabModeAsync, GrabModeSync, None, None);
 907}
 908
 909void
 910grabkeys(void)  {
 911	unsigned int i, j;
 912	KeyCode code;
 913	XModifierKeymap *modmap;
 914
 915	/* init modifier map */
 916	modmap = XGetModifierMapping(dpy);
 917	for(i = 0; i < 8; i++)
 918		for(j = 0; j < modmap->max_keypermod; j++) {
 919			if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 920				numlockmask = (1 << i);
 921		}
 922	XFreeModifiermap(modmap);
 923
 924	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 925	for(i = 0; i < LENGTH(keys); i++) {
 926		code = XKeysymToKeycode(dpy, keys[i].keysym);
 927		XGrabKey(dpy, code, keys[i].mod, root, True,
 928				GrabModeAsync, GrabModeAsync);
 929		XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
 930				GrabModeAsync, GrabModeAsync);
 931		XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
 932				GrabModeAsync, GrabModeAsync);
 933		XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
 934				GrabModeAsync, GrabModeAsync);
 935	}
 936}
 937
 938unsigned int
 939idxoftag(const char *tag) {
 940	unsigned int i;
 941
 942	for(i = 0; (i < LENGTH(tags)) && (tags[i] != tag); i++);
 943	return (i < LENGTH(tags)) ? i : 0;
 944}
 945
 946void
 947initfont(const char *fontstr) {
 948	char *def, **missing;
 949	int i, n;
 950
 951	missing = NULL;
 952	if(dc.font.set)
 953		XFreeFontSet(dpy, dc.font.set);
 954	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 955	if(missing) {
 956		while(n--)
 957			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 958		XFreeStringList(missing);
 959	}
 960	if(dc.font.set) {
 961		XFontSetExtents *font_extents;
 962		XFontStruct **xfonts;
 963		char **font_names;
 964		dc.font.ascent = dc.font.descent = 0;
 965		font_extents = XExtentsOfFontSet(dc.font.set);
 966		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 967		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 968			if(dc.font.ascent < (*xfonts)->ascent)
 969				dc.font.ascent = (*xfonts)->ascent;
 970			if(dc.font.descent < (*xfonts)->descent)
 971				dc.font.descent = (*xfonts)->descent;
 972			xfonts++;
 973		}
 974	}
 975	else {
 976		if(dc.font.xfont)
 977			XFreeFont(dpy, dc.font.xfont);
 978		dc.font.xfont = NULL;
 979		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 980		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 981			eprint("error, cannot load font: '%s'\n", fontstr);
 982		dc.font.ascent = dc.font.xfont->ascent;
 983		dc.font.descent = dc.font.xfont->descent;
 984	}
 985	dc.font.height = dc.font.ascent + dc.font.descent;
 986}
 987
 988Bool
 989isoccupied(Monitor *monitor, unsigned int t) {
 990	Client *c;
 991
 992	for(c = clients; c; c = c->next)
 993		if(c->tags[t] && c->monitor == monitor)
 994			return True;
 995	return False;
 996}
 997
 998Bool
 999isprotodel(Client *c) {
1000	int i, n;
1001	Atom *protocols;
1002	Bool ret = False;
1003
1004	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1005		for(i = 0; !ret && i < n; i++)
1006			if(protocols[i] == wmatom[WMDelete])
1007				ret = True;
1008		XFree(protocols);
1009	}
1010	return ret;
1011}
1012
1013Bool
1014isurgent(Monitor *monitor, unsigned int t) {
1015	Client *c;
1016
1017	for(c = clients; c; c = c->next)
1018		if(c->monitor == monitor && c->isurgent && c->tags[t])
1019			return True;
1020	return False;
1021}
1022
1023Bool
1024isvisible(Client *c, Monitor *m) {
1025	unsigned int i;
1026
1027	if(c->monitor != m)
1028		return False;
1029	for(i = 0; i < LENGTH(tags); i++)
1030		if(c->tags[i] && c->monitor->seltags[i])
1031			return True;
1032	return False;
1033}
1034
1035void
1036keypress(XEvent *e) {
1037	unsigned int i;
1038	KeySym keysym;
1039	XKeyEvent *ev;
1040
1041	ev = &e->xkey;
1042	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1043	for(i = 0; i < LENGTH(keys); i++)
1044		if(keysym == keys[i].keysym
1045		&& CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
1046		{
1047			if(keys[i].func)
1048				keys[i].func(keys[i].arg);
1049		}
1050}
1051
1052void
1053killclient(const char *arg) {
1054	XEvent ev;
1055
1056	if(!sel)
1057		return;
1058	if(isprotodel(sel)) {
1059		ev.type = ClientMessage;
1060		ev.xclient.window = sel->win;
1061		ev.xclient.message_type = wmatom[WMProtocols];
1062		ev.xclient.format = 32;
1063		ev.xclient.data.l[0] = wmatom[WMDelete];
1064		ev.xclient.data.l[1] = CurrentTime;
1065		XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
1066	}
1067	else
1068		XKillClient(dpy, sel->win);
1069}
1070
1071void
1072manage(Window w, XWindowAttributes *wa) {
1073	Client *c, *t = NULL;
1074	Monitor *m;
1075	Status rettrans;
1076	Window trans;
1077	XWindowChanges wc;
1078
1079	c = emallocz(sizeof(Client));
1080	c->tags = emallocz(sizeof initags);
1081	c->win = w;
1082
1083	applyrules(c);
1084
1085	m = c->monitor;
1086
1087	c->x = wa->x + m->sx;
1088	c->y = wa->y + m->sy;
1089	c->w = wa->width;
1090	c->h = wa->height;
1091	c->oldborder = wa->border_width;
1092
1093	if(c->w == m->sw && c->h == m->sh) {
1094		c->x = m->sx;
1095		c->y = m->sy;
1096		c->border = wa->border_width;
1097	}
1098	else {
1099		if(c->x + c->w + 2 * c->border > m->wax + m->waw)
1100			c->x = m->wax + m->waw - c->w - 2 * c->border;
1101		if(c->y + c->h + 2 * c->border > m->way + m->wah)
1102			c->y = m->way + m->wah - c->h - 2 * c->border;
1103		if(c->x < m->wax)
1104			c->x = m->wax;
1105		if(c->y < m->way)
1106			c->y = m->way;
1107		c->border = BORDERPX;
1108	}
1109	wc.border_width = c->border;
1110	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1111	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1112	configure(c); /* propagates border_width, if size doesn't change */
1113	updatesizehints(c);
1114	XSelectInput(dpy, w, EnterWindowMask | FocusChangeMask | PropertyChangeMask | StructureNotifyMask);
1115	grabbuttons(c, False);
1116	updatetitle(c);
1117	if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1118		for(t = clients; t && t->win != trans; t = t->next);
1119	if(t)
1120		memcpy(c->tags, t->tags, sizeof initags);
1121	if(!c->isfloating)
1122		c->isfloating = (rettrans == Success) || c->isfixed;
1123	attach(c);
1124	attachstack(c);
1125	XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1126	ban(c);
1127	XMapWindow(dpy, c->win);
1128	setclientstate(c, NormalState);
1129	arrange(m);
1130}
1131
1132void
1133mappingnotify(XEvent *e) {
1134	XMappingEvent *ev = &e->xmapping;
1135
1136	XRefreshKeyboardMapping(ev);
1137	if(ev->request == MappingKeyboard)
1138		grabkeys();
1139}
1140
1141void
1142maprequest(XEvent *e) {
1143	static XWindowAttributes wa;
1144	XMapRequestEvent *ev = &e->xmaprequest;
1145
1146	if(!XGetWindowAttributes(dpy, ev->window, &wa))
1147		return;
1148	if(wa.override_redirect)
1149		return;
1150	if(!getclient(ev->window))
1151		manage(ev->window, &wa);
1152}
1153
1154Monitor *
1155monitorat() {
1156	int i, x, y;
1157	Window win;
1158	unsigned int mask;
1159
1160	XQueryPointer(dpy, root, &win, &win, &x, &y, &i, &i, &mask);
1161	for(i = 0; i < mcount; i++) {
1162		if((x >= monitors[i].sx && x < monitors[i].sx + monitors[i].sw)
1163		&& (y >= monitors[i].sy && y < monitors[i].sy + monitors[i].sh)) {
1164			return &monitors[i];
1165		}
1166	}
1167	return NULL;
1168}
1169
1170void
1171movemouse(Client *c) {
1172	int x1, y1, ocx, ocy, di, nx, ny;
1173	unsigned int dui;
1174	Monitor *m;
1175	Window dummy;
1176	XEvent ev;
1177
1178	ocx = nx = c->x;
1179	ocy = ny = c->y;
1180	m = c->monitor;
1181	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1182			None, cursor[CurMove], CurrentTime) != GrabSuccess)
1183		return;
1184	XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1185	for(;;) {
1186		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
1187		switch (ev.type) {
1188		case ButtonRelease:
1189			XUngrabPointer(dpy, CurrentTime);
1190			return;
1191		case ConfigureRequest:
1192		case Expose:
1193		case MapRequest:
1194			handler[ev.type](&ev);
1195			break;
1196		case MotionNotify:
1197			XSync(dpy, False);
1198			nx = ocx + (ev.xmotion.x - x1);
1199			ny = ocy + (ev.xmotion.y - y1);
1200			if(abs(m->wax - nx) < SNAP)
1201				nx = m->wax;
1202			else if(abs((m->wax + m->waw) - (nx + c->w + 2 * c->border)) < SNAP)
1203				nx = m->wax + m->waw - c->w - 2 * c->border;
1204			if(abs(m->way - ny) < SNAP)
1205				ny = m->way;
1206			else if(abs((m->way + m->wah) - (ny + c->h + 2 * c->border)) < SNAP)
1207				ny = m->way + m->wah - c->h - 2 * c->border;
1208			if(!c->isfloating && (m->layout->arrange != floating) && (abs(nx - c->x) > SNAP || abs(ny - c->y) > SNAP))
1209				togglefloating(NULL);
1210			if((m->layout->arrange == floating) || c->isfloating)
1211				resize(c, nx, ny, c->w, c->h, False);
1212			break;
1213		}
1214	}
1215}
1216
1217Client *
1218nexttiled(Client *c, Monitor *monitor) {
1219	for(; c && (c->isfloating || !isvisible(c, monitor)); c = c->next);
1220	return c;
1221}
1222
1223void
1224propertynotify(XEvent *e) {
1225	Client *c;
1226	Window trans;
1227	XPropertyEvent *ev = &e->xproperty;
1228
1229	if(ev->state == PropertyDelete)
1230		return; /* ignore */
1231	if((c = getclient(ev->window))) {
1232		switch (ev->atom) {
1233		default: break;
1234		case XA_WM_TRANSIENT_FOR:
1235			XGetTransientForHint(dpy, c->win, &trans);
1236			if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1237				arrange(c->monitor);
1238			break;
1239		case XA_WM_NORMAL_HINTS:
1240			updatesizehints(c);
1241			break;
1242		case XA_WM_HINTS:
1243			updatewmhints(c);
1244			drawbar(c->monitor);
1245			break;
1246		}
1247		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1248			updatetitle(c);
1249			if(c == sel)
1250				drawbar(c->monitor);
1251		}
1252	}
1253}
1254
1255void
1256quit(const char *arg) {
1257	readin = running = False;
1258}
1259
1260void
1261reapply(const char *arg) {
1262	static Bool zerotags[LENGTH(tags)] = { 0 };
1263	Client *c;
1264
1265	for(c = clients; c; c = c->next) {
1266		memcpy(c->tags, zerotags, sizeof zerotags);
1267		applyrules(c);
1268	}
1269	arrange(NULL);
1270}
1271
1272void
1273resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1274	Monitor *m;
1275	XWindowChanges wc;
1276
1277	m = c->monitor;
1278	if(sizehints) {
1279		/* set minimum possible */
1280		if (w < 1)
1281			w = 1;
1282		if (h < 1)
1283			h = 1;
1284
1285		/* temporarily remove base dimensions */
1286		w -= c->basew;
1287		h -= c->baseh;
1288
1289		/* adjust for aspect limits */
1290		if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1291			if (w * c->maxay > h * c->maxax)
1292				w = h * c->maxax / c->maxay;
1293			else if (w * c->minay < h * c->minax)
1294				h = w * c->minay / c->minax;
1295		}
1296
1297		/* adjust for increment value */
1298		if(c->incw)
1299			w -= w % c->incw;
1300		if(c->inch)
1301			h -= h % c->inch;
1302
1303		/* restore base dimensions */
1304		w += c->basew;
1305		h += c->baseh;
1306
1307		if(c->minw > 0 && w < c->minw)
1308			w = c->minw;
1309		if(c->minh > 0 && h < c->minh)
1310			h = c->minh;
1311		if(c->maxw > 0 && w > c->maxw)
1312			w = c->maxw;
1313		if(c->maxh > 0 && h > c->maxh)
1314			h = c->maxh;
1315	}
1316	if(w <= 0 || h <= 0)
1317		return;
1318	if(x > m->sw)
1319		x = m->sw - w - 2 * c->border;
1320	if(y > m->sh)
1321		y = m->sh - h - 2 * c->border;
1322	if(x + w + 2 * c->border < m->sx)
1323		x = m->sx;
1324	if(y + h + 2 * c->border < m->sy)
1325		y = m->sy;
1326	fprintf(stderr, "resize %d %d %d %d (%d %d %d %d)\n", x, y , w, h, m->sx, m->sy, m->sw, m->sh);
1327	if(c->x != x || c->y != y || c->w != w || c->h != h) {
1328		c->x = wc.x = x;
1329		c->y = wc.y = y;
1330		c->w = wc.width = w;
1331		c->h = wc.height = h;
1332		wc.border_width = c->border;
1333		XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
1334		configure(c);
1335		XSync(dpy, False);
1336	}
1337}
1338
1339void
1340resizemouse(Client *c) {
1341	int ocx, ocy;
1342	int nw, nh;
1343	Monitor *m;
1344	XEvent ev;
1345
1346	ocx = c->x;
1347	ocy = c->y;
1348	m = c->monitor;
1349	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1350			None, cursor[CurResize], CurrentTime) != GrabSuccess)
1351		return;
1352	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1353	for(;;) {
1354		XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
1355		switch(ev.type) {
1356		case ButtonRelease:
1357			XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1358					c->w + c->border - 1, c->h + c->border - 1);
1359			XUngrabPointer(dpy, CurrentTime);
1360			while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1361			return;
1362		case ConfigureRequest:
1363		case Expose:
1364		case MapRequest:
1365			handler[ev.type](&ev);
1366			break;
1367		case MotionNotify:
1368			XSync(dpy, False);
1369			if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1370				nw = 1;
1371			if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1372				nh = 1;
1373			if(!c->isfloating && (m->layout->arrange != floating) && (abs(nw - c->w) > SNAP || abs(nh - c->h) > SNAP))
1374				togglefloating(NULL);
1375			if((m->layout->arrange == floating) || c->isfloating)
1376				resize(c, c->x, c->y, nw, nh, True);
1377			break;
1378		}
1379	}
1380}
1381
1382void
1383restack(Monitor *m) {
1384	Client *c;
1385	XEvent ev;
1386	XWindowChanges wc;
1387
1388	drawbar(m);
1389	if(!sel)
1390		return;
1391	if(sel->isfloating || (m->layout->arrange == floating))
1392		XRaiseWindow(dpy, sel->win);
1393	if(m->layout->arrange != floating) {
1394		wc.stack_mode = Below;
1395		wc.sibling = m->barwin;
1396		if(!sel->isfloating) {
1397			XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1398			wc.sibling = sel->win;
1399		}
1400		for(c = nexttiled(clients, m); c; c = nexttiled(c->next, m)) {
1401			if(c == sel)
1402				continue;
1403			XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1404			wc.sibling = c->win;
1405		}
1406	}
1407	XSync(dpy, False);
1408	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1409}
1410
1411void
1412run(void) {
1413	char *p;
1414	char buf[sizeof stext];
1415	fd_set rd;
1416	int r, xfd;
1417	unsigned int len, offset;
1418	XEvent ev;
1419
1420	/* main event loop, also reads status text from stdin */
1421	XSync(dpy, False);
1422	xfd = ConnectionNumber(dpy);
1423	readin = True;
1424	offset = 0;
1425	len = sizeof stext - 1;
1426	buf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
1427	while(running) {
1428		FD_ZERO(&rd);
1429		if(readin)
1430			FD_SET(STDIN_FILENO, &rd);
1431		FD_SET(xfd, &rd);
1432		if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1433			if(errno == EINTR)
1434				continue;
1435			eprint("select failed\n");
1436		}
1437		if(FD_ISSET(STDIN_FILENO, &rd)) {
1438			switch((r = read(STDIN_FILENO, buf + offset, len - offset))) {
1439			case -1:
1440				strncpy(stext, strerror(errno), len);
1441				readin = False;
1442				break;
1443			case 0:
1444				strncpy(stext, "EOF", 4);
1445				readin = False;
1446				break;
1447			default:
1448				for(p = buf + offset; r > 0; p++, r--, offset++)
1449					if(*p == '\n' || *p == '\0') {
1450						*p = '\0';
1451						strncpy(stext, buf, len);
1452						p += r - 1; /* p is buf + offset + r - 1 */
1453						for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
1454						offset = r;
1455						if(r)
1456							memmove(buf, p - r + 1, r);
1457						break;
1458					}
1459				break;
1460			}
1461			drawbar(selmonitor);
1462		}
1463		while(XPending(dpy)) {
1464			XNextEvent(dpy, &ev);
1465			if(handler[ev.type])
1466				(handler[ev.type])(&ev); /* call handler */
1467		}
1468	}
1469}
1470
1471void
1472scan(void) {
1473	unsigned int i, num;
1474	Window *wins, d1, d2;
1475	XWindowAttributes wa;
1476
1477	wins = NULL;
1478	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1479		for(i = 0; i < num; i++) {
1480			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1481					|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1482				continue;
1483			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1484				manage(wins[i], &wa);
1485		}
1486		for(i = 0; i < num; i++) { /* now the transients */
1487			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1488				continue;
1489			if(XGetTransientForHint(dpy, wins[i], &d1)
1490					&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1491				manage(wins[i], &wa);
1492		}
1493	}
1494	if(wins)
1495		XFree(wins);
1496}
1497
1498void
1499setclientstate(Client *c, long state) {
1500	long data[] = {state, None};
1501
1502	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1503			PropModeReplace, (unsigned char *)data, 2);
1504}
1505
1506void
1507setlayout(const char *arg) {
1508	unsigned int i;
1509	Monitor *m = monitorat();
1510
1511	if(!arg) {
1512		m->layout++;
1513		if(m->layout == &layouts[LENGTH(layouts)])
1514			m->layout = &layouts[0];
1515	}
1516	else {
1517		for(i = 0; i < LENGTH(layouts); i++)
1518			if(!strcmp(arg, layouts[i].symbol))
1519				break;
1520		if(i == LENGTH(layouts))
1521			return;
1522		m->layout = &layouts[i];
1523	}
1524	if(sel)
1525		arrange(m);
1526	else
1527		drawbar(m);
1528}
1529
1530void
1531setmwfact(const char *arg) {
1532	double delta;
1533
1534	Monitor *m = monitorat();
1535
1536	if(!domwfact)
1537		return;
1538	/* arg handling, manipulate mwfact */
1539	if(arg == NULL)
1540		m->mwfact = MWFACT;
1541	else if(sscanf(arg, "%lf", &delta) == 1) {
1542		if(arg[0] == '+' || arg[0] == '-')
1543			m->mwfact += delta;
1544		else
1545			m->mwfact = delta;
1546		if(m->mwfact < 0.1)
1547			m->mwfact = 0.1;
1548		else if(m->mwfact > 0.9)
1549			m->mwfact = 0.9;
1550	}
1551	arrange(m);
1552}
1553
1554void
1555setup(void) {
1556	unsigned int i;
1557	Monitor *m;
1558	XSetWindowAttributes wa;
1559	XineramaScreenInfo *info = NULL;
1560
1561	/* init atoms */
1562	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1563	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1564	wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1565	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1566	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1567	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1568
1569	/* init cursors */
1570	wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1571	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1572	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1573
1574	// init screens/monitors first
1575	if((isxinerama = XineramaIsActive(dpy)))
1576		info = XineramaQueryScreens(dpy, &mcount);
1577	selmonitor = monitors = emallocz(mcount * sizeof(Monitor));
1578
1579	screen = DefaultScreen(dpy);
1580	root = RootWindow(dpy, screen);
1581
1582	/* init appearance */
1583	dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1584	dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1585	dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1586	dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1587	dc.sel[ColBG] = getcolor(SELBGCOLOR);
1588	dc.sel[ColFG] = getcolor(SELFGCOLOR);
1589	initfont(FONT);
1590	dc.h = bh = dc.font.height + 2;
1591	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1592	dc.gc = XCreateGC(dpy, root, 0, 0);
1593	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1594	if(!dc.font.set)
1595		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1596
1597	for(blw = i = 0; i < LENGTH(layouts); i++) {
1598		i = textw(layouts[i].symbol);
1599		if(i > blw)
1600			blw = i;
1601	}
1602	for(i = 0; i < mcount; i++) {
1603		/* init geometry */
1604		m = &monitors[i];
1605
1606		if(mcount != 1 && isxinerama) {
1607			m->sx = info[i].x_org;
1608			m->sy = info[i].y_org;
1609			m->sw = info[i].width;
1610			m->sh = info[i].height;
1611			fprintf(stderr, "monitor[%d]: %d,%d,%d,%d\n", i, m->sx, m->sy, m->sw, m->sh);
1612		}
1613		else {
1614			m->sx = 0;
1615			m->sy = 0;
1616			m->sw = DisplayWidth(dpy, screen);
1617			m->sh = DisplayHeight(dpy, screen);
1618		}
1619
1620		m->seltags = emallocz(sizeof initags);
1621		m->prevtags = emallocz(sizeof initags);
1622
1623		memcpy(m->seltags, initags, sizeof initags);
1624		memcpy(m->prevtags, initags, sizeof initags);
1625
1626		/* init layouts */
1627		m->mwfact = MWFACT;
1628		m->layout = &layouts[0];
1629
1630		// TODO: bpos per screen?
1631		bpos = BARPOS;
1632		wa.override_redirect = 1;
1633		wa.background_pixmap = ParentRelative;
1634		wa.event_mask = ButtonPressMask | ExposureMask;
1635
1636		/* init bars */
1637		m->barwin = XCreateWindow(dpy, root, m->sx, m->sy, m->sw, bh, 0,
1638				DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1639				CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
1640		XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1641		updatebarpos(m);
1642		XMapRaised(dpy, m->barwin);
1643		strcpy(stext, "dwm-"VERSION);
1644
1645		/* EWMH support per monitor */
1646		XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1647				PropModeReplace, (unsigned char *) netatom, NetLast);
1648
1649		/* select for events */
1650		wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1651				| EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1652		XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1653		XSelectInput(dpy, root, wa.event_mask);
1654
1655		drawbar(m);
1656	}
1657	if(info)
1658		XFree(info);
1659
1660	/* grab keys */
1661	grabkeys();
1662
1663	/* init tags */
1664	compileregs();
1665
1666	selmonitor = monitorat();
1667	fprintf(stderr, "selmonitor == %d\n", selmonitor - monitors);
1668}
1669
1670void
1671spawn(const char *arg) {
1672	static char *shell = NULL;
1673
1674	if(!shell && !(shell = getenv("SHELL")))
1675		shell = "/bin/sh";
1676	if(!arg)
1677		return;
1678	/* The double-fork construct avoids zombie processes and keeps the code
1679	 * clean from stupid signal handlers. */
1680	if(fork() == 0) {
1681		if(fork() == 0) {
1682			if(dpy)
1683				close(ConnectionNumber(dpy));
1684			setsid();
1685			execl(shell, shell, "-c", arg, (char *)NULL);
1686			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1687			perror(" failed");
1688		}
1689		exit(0);
1690	}
1691	wait(0);
1692}
1693
1694void
1695tag(const char *arg) {
1696	unsigned int i;
1697
1698	if(!sel)
1699		return;
1700	for(i = 0; i < LENGTH(tags); i++)
1701		sel->tags[i] = (NULL == arg);
1702	sel->tags[idxoftag(arg)] = True;
1703	arrange(sel->monitor);
1704}
1705
1706unsigned int
1707textnw(const char *text, unsigned int len) {
1708	XRectangle r;
1709
1710	if(dc.font.set) {
1711		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1712		return r.width;
1713	}
1714	return XTextWidth(dc.font.xfont, text, len);
1715}
1716
1717unsigned int
1718textw(const char *text) {
1719	return textnw(text, strlen(text)) + dc.font.height;
1720}
1721
1722void
1723tile(Monitor *m) {
1724	unsigned int i, n, nx, ny, nw, nh, mw, th;
1725	Client *c, *mc;
1726
1727	domwfact = dozoom = True;
1728	nx = m->wax;
1729	ny = m->way;
1730	nw = 0;
1731	for(n = 0, c = nexttiled(clients, m); c; c = nexttiled(c->next, m))
1732		n++;
1733
1734	/* window geoms */
1735	mw = (n == 1) ? m->waw : m->mwfact * m->waw;
1736	th = (n > 1) ? m->wah / (n - 1) : 0;
1737	if(n > 1 && th < bh)
1738		th = m->wah;
1739
1740	for(i = 0, c = mc = nexttiled(clients, m); c; c = nexttiled(c->next, m)) {
1741		if(i == 0) { /* master */
1742			nx = m->wax;
1743			ny = m->way;
1744			nw = mw - 2 * c->border;
1745			nh = m->wah - 2 * c->border;
1746		}
1747		else {  /* tile window */
1748			if(i == 1) {
1749				ny = m->way;
1750				nx += mc->w + 2 * mc->border;
1751				nw = m->waw - mw - 2 * c->border;
1752			}
1753			if(i + 1 == n) /* remainder */
1754				nh = (m->way + m->wah) - ny - 2 * c->border;
1755			else
1756				nh = th - 2 * c->border;
1757		}
1758		fprintf(stderr, "tile %d %d %d %d\n", nx, ny, nw, nh);
1759		resize(c, nx, ny, nw, nh, RESIZEHINTS);
1760		if((RESIZEHINTS) && ((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw)))
1761			/* client doesn't accept size constraints */
1762			resize(c, nx, ny, nw, nh, False);
1763		if(n > 1 && th != m->wah)
1764			ny = c->y + c->h + 2 * c->border;
1765		i++;
1766	}
1767}
1768
1769void
1770togglebar(const char *arg) {
1771	if(bpos == BarOff)
1772		bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1773	else
1774		bpos = BarOff;
1775	updatebarpos(monitorat());
1776	arrange(monitorat());
1777}
1778
1779void
1780togglefloating(const char *arg) {
1781	if(!sel)
1782		return;
1783	sel->isfloating = !sel->isfloating;
1784	if(sel->isfloating)
1785		resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1786	arrange(sel->monitor);
1787}
1788
1789void
1790toggletag(const char *arg) {
1791	unsigned int i, j;
1792
1793	if(!sel)
1794		return;
1795	i = idxoftag(arg);
1796	sel->tags[i] = !sel->tags[i];
1797	for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
1798	if(j == LENGTH(tags))
1799		sel->tags[i] = True; /* at least one tag must be enabled */
1800	arrange(sel->monitor);
1801}
1802
1803void
1804toggleview(const char *arg) {
1805	unsigned int i, j;
1806	Monitor *m = monitorat();
1807
1808	i = idxoftag(arg);
1809	m->seltags[i] = !m->seltags[i];
1810	for(j = 0; j < LENGTH(tags) && !m->seltags[j]; j++);
1811	if(j == LENGTH(tags))
1812		m->seltags[i] = True; /* at least one tag must be viewed */
1813	arrange(m);
1814}
1815
1816void
1817unban(Client *c) {
1818	if(!c->isbanned)
1819		return;
1820	XMoveWindow(dpy, c->win, c->x, c->y);
1821	c->isbanned = False;
1822}
1823
1824void
1825unmanage(Client *c) {
1826	Monitor *m = c->monitor;
1827	XWindowChanges wc;
1828
1829	wc.border_width = c->oldborder;
1830	/* The server grab construct avoids race conditions. */
1831	XGrabServer(dpy);
1832	XSetErrorHandler(xerrordummy);
1833	XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1834	detach(c);
1835	detachstack(c);
1836	if(sel == c)
1837		focus(NULL);
1838	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1839	setclientstate(c, WithdrawnState);
1840	free(c->tags);
1841	free(c);
1842	XSync(dpy, False);
1843	XSetErrorHandler(xerror);
1844	XUngrabServer(dpy);
1845	arrange(m);
1846}
1847
1848void
1849unmapnotify(XEvent *e) {
1850	Client *c;
1851	XUnmapEvent *ev = &e->xunmap;
1852
1853	if((c = getclient(ev->window)))
1854		unmanage(c);
1855}
1856
1857void
1858updatebarpos(Monitor *m) {
1859	XEvent ev;
1860
1861	m->wax = m->sx;
1862	m->way = m->sy;
1863	m->wah = m->sh;
1864	m->waw = m->sw;
1865	switch(bpos) {
1866	default:
1867		m->wah -= bh;
1868		m->way += bh;
1869		XMoveWindow(dpy, m->barwin, m->sx, m->sy);
1870		break;
1871	case BarBot:
1872		m->wah -= bh;
1873		XMoveWindow(dpy, m->barwin, m->sx, m->sy + m->wah);
1874		break;
1875	case BarOff:
1876		XMoveWindow(dpy, m->barwin, m->sx, m->sy - bh);
1877		break;
1878	}
1879	XSync(dpy, False);
1880	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1881}
1882
1883void
1884updatesizehints(Client *c) {
1885	long msize;
1886	XSizeHints size;
1887
1888	if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1889		size.flags = PSize;
1890	c->flags = size.flags;
1891	if(c->flags & PBaseSize) {
1892		c->basew = size.base_width;
1893		c->baseh = size.base_height;
1894	}
1895	else if(c->flags & PMinSize) {
1896		c->basew = size.min_width;
1897		c->baseh = size.min_height;
1898	}
1899	else
1900		c->basew = c->baseh = 0;
1901	if(c->flags & PResizeInc) {
1902		c->incw = size.width_inc;
1903		c->inch = size.height_inc;
1904	}
1905	else
1906		c->incw = c->inch = 0;
1907	if(c->flags & PMaxSize) {
1908		c->maxw = size.max_width;
1909		c->maxh = size.max_height;
1910	}
1911	else
1912		c->maxw = c->maxh = 0;
1913	if(c->flags & PMinSize) {
1914		c->minw = size.min_width;
1915		c->minh = size.min_height;
1916	}
1917	else if(c->flags & PBaseSize) {
1918		c->minw = size.base_width;
1919		c->minh = size.base_height;
1920	}
1921	else
1922		c->minw = c->minh = 0;
1923	if(c->flags & PAspect) {
1924		c->minax = size.min_aspect.x;
1925		c->maxax = size.max_aspect.x;
1926		c->minay = size.min_aspect.y;
1927		c->maxay = size.max_aspect.y;
1928	}
1929	else
1930		c->minax = c->maxax = c->minay = c->maxay = 0;
1931	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1932			&& c->maxw == c->minw && c->maxh == c->minh);
1933}
1934
1935void
1936updatetitle(Client *c) {
1937	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1938		gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1939}
1940
1941void
1942updatewmhints(Client *c) {
1943	XWMHints *wmh;
1944
1945	if((wmh = XGetWMHints(dpy, c->win))) {
1946		c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1947		XFree(wmh);
1948	}
1949}
1950
1951/* There's no way to check accesses to destroyed windows, thus those cases are
1952 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1953 * default error handler, which may call exit.  */
1954int
1955xerror(Display *dpy, XErrorEvent *ee) {
1956	if(ee->error_code == BadWindow
1957	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1958	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1959	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1960	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1961	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1962	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1963	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1964		return 0;
1965	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1966		ee->request_code, ee->error_code);
1967	return xerrorxlib(dpy, ee); /* may call exit */
1968}
1969
1970int
1971xerrordummy(Display *dsply, XErrorEvent *ee) {
1972	return 0;
1973}
1974
1975/* Startup Error handler to check if another window manager
1976 * is already running. */
1977int
1978xerrorstart(Display *dsply, XErrorEvent *ee) {
1979	otherwm = True;
1980	return -1;
1981}
1982
1983void
1984view(const char *arg) {
1985	unsigned int i;
1986	Bool tmp[LENGTH(tags)];
1987	Monitor *m = monitorat();
1988
1989	for(i = 0; i < LENGTH(tags); i++)
1990		tmp[i] = (NULL == arg);
1991	tmp[idxoftag(arg)] = True;
1992	if(memcmp(m->seltags, tmp, sizeof initags) != 0) {
1993		memcpy(m->prevtags, m->seltags, sizeof initags);
1994		memcpy(m->seltags, tmp, sizeof initags);
1995		arrange(m);
1996	}
1997}
1998
1999void
2000viewprevtag(const char *arg) {
2001	static Bool tmp[LENGTH(tags)];
2002
2003	Monitor *m = monitorat();
2004
2005	memcpy(tmp, m->seltags, sizeof initags);
2006	memcpy(m->seltags, m->prevtags, sizeof initags);
2007	memcpy(m->prevtags, tmp, sizeof initags);
2008	arrange(m);
2009}
2010
2011void
2012zoom(const char *arg) {
2013	Client *c = sel;
2014
2015	if(!sel || !dozoom || sel->isfloating)
2016		return;
2017	if(c == nexttiled(clients, c->monitor))
2018		if(!(c = nexttiled(c->next, c->monitor)))
2019			return;
2020	detach(c);
2021	attach(c);
2022	focus(c);
2023	arrange(c->monitor);
2024}
2025
2026void
2027movetomonitor(const char *arg) {
2028	int i;
2029
2030	if (sel)
2031		return;
2032	if(arg)
2033		i = atoi(arg);
2034	else {
2035		for(i = 0; &monitors[i] != sel->monitor && i < mcount; i++);
2036		i++;
2037	}
2038	sel->monitor = &monitors[i % mcount];
2039
2040	memcpy(sel->tags, sel->monitor->seltags, sizeof initags);
2041	resize(sel, sel->monitor->wax, sel->monitor->way, sel->w, sel->h, True);
2042	arrange(sel->monitor);
2043}
2044
2045void
2046selectmonitor(const char *arg) {
2047	int i;
2048	Monitor *m;
2049
2050	if(arg)
2051		i = atoi(arg);
2052	else {
2053		for(i = 0; &monitors[i] != sel->monitor && i < mcount; i++);
2054		i++;
2055	}
2056	m = &monitors[i % mcount];
2057	XWarpPointer(dpy, None, root, 0, 0, 0, 0, m->wax+m->waw/2, m->way+m->wah/2);
2058	focus(NULL);
2059}
2060
2061
2062int
2063main(int argc, char *argv[]) {
2064	if(argc == 2 && !strcmp("-v", argv[1]))
2065		eprint("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
2066	else if(argc != 1)
2067		eprint("usage: dwm [-v]\n");
2068
2069	setlocale(LC_CTYPE, "");
2070	if(!(dpy = XOpenDisplay(0)))
2071		eprint("dwm: cannot open display\n");
2072
2073	checkotherwm();
2074	setup();
2075	scan();
2076	run();
2077	cleanup();
2078
2079	XCloseDisplay(dpy);
2080	return 0;
2081}