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