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