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