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, Bool issingle);
 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);
 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, Bool issingle) {
 250	XWindowChanges wc;
 251
 252	wc.border_width = issingle ? 0 : borderpx;
 253	if(c->bw != wc.border_width) {
 254		c->bw = wc.border_width;
 255		XConfigureWindow(dpy, c->win, CWBorderWidth, &wc);
 256	}
 257}
 258
 259void
 260applyrules(Client *c) {
 261	unsigned int i;
 262	Rule *r;
 263	XClassHint ch = { 0 };
 264
 265	/* rule matching */
 266	if(XGetClassHint(dpy, c->win, &ch)) {
 267		for(i = 0; i < LENGTH(rules); i++) {
 268			r = &rules[i];
 269			if((!r->title || strstr(c->name, r->title))
 270			&& (!r->class || (ch.res_class && strstr(ch.res_class, r->class)))
 271			&& (!r->instance || (ch.res_name && strstr(ch.res_name, r->instance)))) {
 272				c->isfloating = r->isfloating;
 273				c->tags |= r->tags & TAGMASK;
 274			}
 275		}
 276		if(ch.res_class)
 277			XFree(ch.res_class);
 278		if(ch.res_name)
 279			XFree(ch.res_name);
 280	}
 281	if(!c->tags)
 282		c->tags = tagset[seltags];
 283}
 284
 285void
 286arrange(void) {
 287	showhide(stack);
 288	focus(NULL);
 289	if(lt[sellt]->arrange)
 290		lt[sellt]->arrange();
 291	restack();
 292}
 293
 294void
 295attach(Client *c) {
 296	c->next = clients;
 297	clients = c;
 298}
 299
 300void
 301attachstack(Client *c) {
 302	c->snext = stack;
 303	stack = c;
 304}
 305
 306void
 307buttonpress(XEvent *e) {
 308	unsigned int i, x, click;
 309	Arg arg = {0};
 310	Client *c;
 311	XButtonPressedEvent *ev = &e->xbutton;
 312
 313	click = ClkRootWin;
 314	if(ev->window == barwin) {
 315		i = x = 0;
 316		do x += TEXTW(tags[i]); while(ev->x >= x && ++i < LENGTH(tags));
 317		if(i < LENGTH(tags)) {
 318			click = ClkTagBar;
 319			arg.ui = 1 << i;
 320		}
 321		else if(ev->x < x + blw)
 322			click = ClkLtSymbol;
 323		else if(ev->x > wx + ww - TEXTW(stext))
 324			click = ClkStatusText;
 325		else
 326			click = ClkWinTitle;
 327	}
 328	else if((c = getclient(ev->window))) {
 329		focus(c);
 330		click = ClkClientWin;
 331	}
 332
 333	for(i = 0; i < LENGTH(buttons); i++)
 334		if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 335		   && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 336			buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 337}
 338
 339void
 340checkotherwm(void) {
 341	otherwm = False;
 342	xerrorxlib = XSetErrorHandler(xerrorstart);
 343
 344	/* this causes an error if some other window manager is running */
 345	XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 346	XSync(dpy, False);
 347	if(otherwm)
 348		die("dwm: another window manager is already running\n");
 349	XSetErrorHandler(xerror);
 350	XSync(dpy, False);
 351}
 352
 353void
 354cleanup(void) {
 355	Arg a = {.ui = ~0};
 356	Layout foo = { "", NULL };
 357
 358	view(&a);
 359	lt[sellt] = &foo;
 360	while(stack)
 361		unmanage(stack);
 362	if(dc.font.set)
 363		XFreeFontSet(dpy, dc.font.set);
 364	else
 365		XFreeFont(dpy, dc.font.xfont);
 366	XUngrabKey(dpy, AnyKey, AnyModifier, root);
 367	XFreePixmap(dpy, dc.drawable);
 368	XFreeGC(dpy, dc.gc);
 369	XFreeCursor(dpy, cursor[CurNormal]);
 370	XFreeCursor(dpy, cursor[CurResize]);
 371	XFreeCursor(dpy, cursor[CurMove]);
 372	XDestroyWindow(dpy, barwin);
 373	XSync(dpy, False);
 374	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 375}
 376
 377void
 378clearurgent(Client *c) {
 379	XWMHints *wmh;
 380
 381	c->isurgent = False;
 382	if(!(wmh = XGetWMHints(dpy, c->win)))
 383		return;
 384	wmh->flags &= ~XUrgencyHint;
 385	XSetWMHints(dpy, c->win, wmh);
 386	XFree(wmh);
 387}
 388
 389void
 390configure(Client *c) {
 391	XConfigureEvent ce;
 392
 393	ce.type = ConfigureNotify;
 394	ce.display = dpy;
 395	ce.event = c->win;
 396	ce.window = c->win;
 397	ce.x = c->x;
 398	ce.y = c->y;
 399	ce.width = c->w;
 400	ce.height = c->h;
 401	ce.border_width = c->bw;
 402	ce.above = None;
 403	ce.override_redirect = False;
 404	XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 405}
 406
 407void
 408configurenotify(XEvent *e) {
 409	XConfigureEvent *ev = &e->xconfigure;
 410
 411	if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 412		sw = ev->width;
 413		sh = ev->height;
 414		updategeom();
 415		updatebar();
 416		arrange();
 417	}
 418}
 419
 420void
 421configurerequest(XEvent *e) {
 422	Client *c;
 423	XConfigureRequestEvent *ev = &e->xconfigurerequest;
 424	XWindowChanges wc;
 425
 426	if((c = getclient(ev->window))) {
 427		if(ev->value_mask & CWBorderWidth)
 428			c->bw = ev->border_width;
 429		else if(c->isfloating || !lt[sellt]->arrange) {
 430			if(ev->value_mask & CWX)
 431				c->x = sx + ev->x;
 432			if(ev->value_mask & CWY)
 433				c->y = sy + ev->y;
 434			if(ev->value_mask & CWWidth)
 435				c->w = ev->width;
 436			if(ev->value_mask & CWHeight)
 437				c->h = ev->height;
 438			if((c->x - sx + c->w) > sw && c->isfloating)
 439				c->x = sx + (sw / 2 - c->w / 2); /* center in x direction */
 440			if((c->y - sy + c->h) > sh && c->isfloating)
 441				c->y = sy + (sh / 2 - c->h / 2); /* center in y direction */
 442			if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 443				configure(c);
 444			if(ISVISIBLE(c))
 445				XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 446		}
 447		else
 448			configure(c);
 449	}
 450	else {
 451		wc.x = ev->x;
 452		wc.y = ev->y;
 453		wc.width = ev->width;
 454		wc.height = ev->height;
 455		wc.border_width = ev->border_width;
 456		wc.sibling = ev->above;
 457		wc.stack_mode = ev->detail;
 458		XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 459	}
 460	XSync(dpy, False);
 461}
 462
 463void
 464destroynotify(XEvent *e) {
 465	Client *c;
 466	XDestroyWindowEvent *ev = &e->xdestroywindow;
 467
 468	if((c = getclient(ev->window)))
 469		unmanage(c);
 470}
 471
 472void
 473detach(Client *c) {
 474	Client **tc;
 475
 476	for(tc = &clients; *tc && *tc != c; tc = &(*tc)->next);
 477	*tc = c->next;
 478}
 479
 480void
 481detachstack(Client *c) {
 482	Client **tc;
 483
 484	for(tc = &stack; *tc && *tc != c; tc = &(*tc)->snext);
 485	*tc = c->snext;
 486}
 487
 488void
 489die(const char *errstr, ...) {
 490	va_list ap;
 491
 492	va_start(ap, errstr);
 493	vfprintf(stderr, errstr, ap);
 494	va_end(ap);
 495	exit(EXIT_FAILURE);
 496}
 497
 498void
 499drawbar(void) {
 500	int x;
 501	unsigned int i, occ = 0, urg = 0;
 502	unsigned long *col;
 503	Client *c;
 504
 505	for(c = clients; c; c = c->next) {
 506		occ |= c->tags;
 507		if(c->isurgent)
 508			urg |= c->tags;
 509	}
 510
 511	dc.x = 0;
 512	for(i = 0; i < LENGTH(tags); i++) {
 513		dc.w = TEXTW(tags[i]);
 514		col = tagset[seltags] & 1 << i ? dc.sel : dc.norm;
 515		drawtext(tags[i], col, urg & 1 << i);
 516		drawsquare(sel && sel->tags & 1 << i, occ & 1 << i, urg & 1 << i, col);
 517		dc.x += dc.w;
 518	}
 519	if(blw > 0) {
 520		dc.w = blw;
 521		drawtext(lt[sellt]->symbol, dc.norm, False);
 522		x = dc.x + dc.w;
 523	}
 524	else
 525		x = dc.x;
 526	dc.w = TEXTW(stext);
 527	dc.x = ww - dc.w;
 528	if(dc.x < x) {
 529		dc.x = x;
 530		dc.w = ww - x;
 531	}
 532	drawtext(stext, dc.norm, False);
 533	if((dc.w = dc.x - x) > bh) {
 534		dc.x = x;
 535		if(sel) {
 536			drawtext(sel->name, dc.sel, False);
 537			drawsquare(sel->isfixed, sel->isfloating, False, dc.sel);
 538		}
 539		else
 540			drawtext(NULL, dc.norm, False);
 541	}
 542	XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, ww, bh, 0, 0);
 543	XSync(dpy, False);
 544}
 545
 546void
 547drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 548	int x;
 549	XGCValues gcv;
 550	XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 551
 552	gcv.foreground = col[invert ? ColBG : ColFG];
 553	XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 554	x = (dc.font.ascent + dc.font.descent + 2) / 4;
 555	r.x = dc.x + 1;
 556	r.y = dc.y + 1;
 557	if(filled) {
 558		r.width = r.height = x + 1;
 559		XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 560	}
 561	else if(empty) {
 562		r.width = r.height = x;
 563		XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 564	}
 565}
 566
 567void
 568drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 569	char buf[256];
 570	int i, x, y, h, len, olen;
 571	XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 572
 573	XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 574	XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 575	if(!text)
 576		return;
 577	olen = strlen(text);
 578	h = dc.font.ascent + dc.font.descent;
 579	y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 580	x = dc.x + (h / 2);
 581	/* shorten text if necessary */
 582	for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 583	if(!len)
 584		return;
 585	memcpy(buf, text, len);
 586	if(len < olen)
 587		for(i = len; i && i > len - 3; buf[--i] = '.');
 588	XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 589	if(dc.font.set)
 590		XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 591	else
 592		XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 593}
 594
 595void
 596enternotify(XEvent *e) {
 597	Client *c;
 598	XCrossingEvent *ev = &e->xcrossing;
 599
 600	if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 601		return;
 602	if((c = getclient(ev->window)))
 603		focus(c);
 604	else
 605		focus(NULL);
 606}
 607
 608void
 609expose(XEvent *e) {
 610	XExposeEvent *ev = &e->xexpose;
 611
 612	if(ev->count == 0 && (ev->window == barwin))
 613		drawbar();
 614}
 615
 616void
 617focus(Client *c) {
 618	if(!c || !ISVISIBLE(c))
 619		for(c = stack; c && !ISVISIBLE(c); c = c->snext);
 620	if(sel && sel != c) {
 621		grabbuttons(sel, False);
 622		XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 623	}
 624	if(c) {
 625		if(c->isurgent)
 626			clearurgent(c);
 627		detachstack(c);
 628		attachstack(c);
 629		grabbuttons(c, True);
 630		XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 631		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 632	}
 633	else
 634		XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 635	sel = c;
 636	drawbar();
 637}
 638
 639void
 640focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 641	XFocusChangeEvent *ev = &e->xfocus;
 642
 643	if(sel && ev->window != sel->win)
 644		XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 645}
 646
 647void
 648focusstack(const Arg *arg) {
 649	Client *c = NULL, *i;
 650
 651	if(!sel)
 652		return;
 653	if (arg->i > 0) {
 654		for(c = sel->next; c && !ISVISIBLE(c); c = c->next);
 655		if(!c)
 656			for(c = clients; c && !ISVISIBLE(c); c = c->next);
 657	}
 658	else {
 659		for(i = clients; i != sel; i = i->next)
 660			if(ISVISIBLE(i))
 661				c = i;
 662		if(!c)
 663			for(; i; i = i->next)
 664				if(ISVISIBLE(i))
 665					c = i;
 666	}
 667	if(c) {
 668		focus(c);
 669		restack();
 670	}
 671}
 672
 673Client *
 674getclient(Window w) {
 675	Client *c;
 676
 677	for(c = clients; c && c->win != w; c = c->next);
 678	return c;
 679}
 680
 681unsigned long
 682getcolor(const char *colstr) {
 683	Colormap cmap = DefaultColormap(dpy, screen);
 684	XColor color;
 685
 686	if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 687		die("error, cannot allocate color '%s'\n", colstr);
 688	return color.pixel;
 689}
 690
 691long
 692getstate(Window w) {
 693	int format, status;
 694	long result = -1;
 695	unsigned char *p = NULL;
 696	unsigned long n, extra;
 697	Atom real;
 698
 699	status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 700			&real, &format, &n, &extra, (unsigned char **)&p);
 701	if(status != Success)
 702		return -1;
 703	if(n != 0)
 704		result = *p;
 705	XFree(p);
 706	return result;
 707}
 708
 709Bool
 710gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 711	char **list = NULL;
 712	int n;
 713	XTextProperty name;
 714
 715	if(!text || size == 0)
 716		return False;
 717	text[0] = '\0';
 718	XGetTextProperty(dpy, w, &name, atom);
 719	if(!name.nitems)
 720		return False;
 721	if(name.encoding == XA_STRING)
 722		strncpy(text, (char *)name.value, size - 1);
 723	else {
 724		if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 725		&& n > 0 && *list) {
 726			strncpy(text, *list, size - 1);
 727			XFreeStringList(list);
 728		}
 729	}
 730	text[size - 1] = '\0';
 731	XFree(name.value);
 732	return True;
 733}
 734
 735void
 736grabbuttons(Client *c, Bool focused) {
 737	updatenumlockmask();
 738	{
 739		unsigned int i, j;
 740		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 741		XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 742		if(focused) {
 743			for(i = 0; i < LENGTH(buttons); i++)
 744				if(buttons[i].click == ClkClientWin)
 745					for(j = 0; j < LENGTH(modifiers); j++)
 746						XGrabButton(dpy, buttons[i].button, buttons[i].mask | modifiers[j], c->win, False, BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 747		} else
 748			XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 749			            BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 750	}
 751}
 752
 753void
 754grabkeys(void) {
 755	updatenumlockmask();
 756	{ /* grab keys */
 757		unsigned int i, j;
 758		unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 759		KeyCode code;
 760
 761		XUngrabKey(dpy, AnyKey, AnyModifier, root);
 762		for(i = 0; i < LENGTH(keys); i++) {
 763			if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 764				for(j = 0; j < LENGTH(modifiers); j++)
 765					XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 766						 True, GrabModeAsync, GrabModeAsync);
 767		}
 768	}
 769}
 770
 771void
 772initfont(const char *fontstr) {
 773	char *def, **missing;
 774	int i, n;
 775
 776	missing = NULL;
 777	dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 778	if(missing) {
 779		while(n--)
 780			fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 781		XFreeStringList(missing);
 782	}
 783	if(dc.font.set) {
 784		XFontSetExtents *font_extents;
 785		XFontStruct **xfonts;
 786		char **font_names;
 787		dc.font.ascent = dc.font.descent = 0;
 788		font_extents = XExtentsOfFontSet(dc.font.set);
 789		n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 790		for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 791			dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 792			dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
 793			xfonts++;
 794		}
 795	}
 796	else {
 797		if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 798		&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 799			die("error, cannot load font: '%s'\n", fontstr);
 800		dc.font.ascent = dc.font.xfont->ascent;
 801		dc.font.descent = dc.font.xfont->descent;
 802	}
 803	dc.font.height = dc.font.ascent + dc.font.descent;
 804}
 805
 806Bool
 807isprotodel(Client *c) {
 808	int i, n;
 809	Atom *protocols;
 810	Bool ret = False;
 811
 812	if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 813		for(i = 0; !ret && i < n; i++)
 814			if(protocols[i] == wmatom[WMDelete])
 815				ret = True;
 816		XFree(protocols);
 817	}
 818	return ret;
 819}
 820
 821void
 822keypress(XEvent *e) {
 823	unsigned int i;
 824	KeySym keysym;
 825	XKeyEvent *ev;
 826
 827	ev = &e->xkey;
 828	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 829	for(i = 0; i < LENGTH(keys); i++)
 830		if(keysym == keys[i].keysym
 831		   && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 832		   && keys[i].func)
 833			keys[i].func(&(keys[i].arg));
 834}
 835
 836void
 837killclient(const Arg *arg) {
 838	XEvent ev;
 839
 840	if(!sel)
 841		return;
 842	if(isprotodel(sel)) {
 843		ev.type = ClientMessage;
 844		ev.xclient.window = sel->win;
 845		ev.xclient.message_type = wmatom[WMProtocols];
 846		ev.xclient.format = 32;
 847		ev.xclient.data.l[0] = wmatom[WMDelete];
 848		ev.xclient.data.l[1] = CurrentTime;
 849		XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 850	}
 851	else
 852		XKillClient(dpy, sel->win);
 853}
 854
 855void
 856manage(Window w, XWindowAttributes *wa) {
 857	static Client cz;
 858	Client *c, *t = NULL;
 859	Window trans = None;
 860	XWindowChanges wc;
 861
 862	if(!(c = malloc(sizeof(Client))))
 863		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
 864	*c = cz;
 865	c->win = w;
 866
 867	/* geometry */
 868	c->x = wa->x;
 869	c->y = wa->y;
 870	c->w = wa->width;
 871	c->h = wa->height;
 872	c->oldbw = wa->border_width;
 873	if(c->w == sw && c->h == sh) {
 874		c->x = sx;
 875		c->y = sy;
 876		c->bw = 0;
 877	}
 878	else {
 879		if(c->x + WIDTH(c) > sx + sw)
 880			c->x = sx + sw - WIDTH(c);
 881		if(c->y + HEIGHT(c) > sy + sh)
 882			c->y = sy + sh - HEIGHT(c);
 883		c->x = MAX(c->x, sx);
 884		/* only fix client y-offset, if the client center might cover the bar */
 885		c->y = MAX(c->y, ((by == 0) && (c->x + (c->w / 2) >= wx) && (c->x + (c->w / 2) < wx + ww)) ? bh : sy);
 886		c->bw = borderpx;
 887	}
 888
 889	wc.border_width = c->bw;
 890	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 891	XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
 892	configure(c); /* propagates border_width, if size doesn't change */
 893	updatesizehints(c);
 894	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 895	grabbuttons(c, False);
 896	updatetitle(c);
 897	if(XGetTransientForHint(dpy, w, &trans))
 898		t = getclient(trans);
 899	if(t)
 900		c->tags = t->tags;
 901	else
 902		applyrules(c);
 903	if(!c->isfloating)
 904		c->isfloating = trans != None || c->isfixed;
 905	if(c->isfloating)
 906		XRaiseWindow(dpy, c->win);
 907	attach(c);
 908	attachstack(c);
 909	XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
 910	XMapWindow(dpy, c->win);
 911	setclientstate(c, NormalState);
 912	arrange();
 913}
 914
 915void
 916mappingnotify(XEvent *e) {
 917	XMappingEvent *ev = &e->xmapping;
 918
 919	XRefreshKeyboardMapping(ev);
 920	if(ev->request == MappingKeyboard)
 921		grabkeys();
 922}
 923
 924void
 925maprequest(XEvent *e) {
 926	static XWindowAttributes wa;
 927	XMapRequestEvent *ev = &e->xmaprequest;
 928
 929	if(!XGetWindowAttributes(dpy, ev->window, &wa))
 930		return;
 931	if(wa.override_redirect)
 932		return;
 933	if(!getclient(ev->window))
 934		manage(ev->window, &wa);
 935}
 936
 937void
 938monocle(void) {
 939	unsigned int n;
 940	Client *c;
 941
 942	for(n = 0, c = nexttiled(clients); c && n < 2; c = nexttiled(c->next), n++);
 943	for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
 944		adjustborder(c, n == 1);
 945		resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
 946	}
 947}
 948
 949void
 950movemouse(const Arg *arg) {
 951	int x, y, ocx, ocy, di, nx, ny;
 952	unsigned int dui;
 953	Client *c;
 954	Window dummy;
 955	XEvent ev;
 956
 957	if(!(c = sel))
 958		return;
 959	restack();
 960	ocx = c->x;
 961	ocy = c->y;
 962	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 963	None, cursor[CurMove], CurrentTime) != GrabSuccess)
 964		return;
 965	XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui);
 966	if(usegrab)
 967		XGrabServer(dpy);
 968	do {
 969		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
 970		switch (ev.type) {
 971		case ConfigureRequest:
 972		case Expose:
 973		case MapRequest:
 974			handler[ev.type](&ev);
 975			break;
 976		case MotionNotify:
 977			nx = ocx + (ev.xmotion.x - x);
 978			ny = ocy + (ev.xmotion.y - y);
 979			if(snap && nx >= wx && nx <= wx + ww
 980			        && ny >= wy && ny <= wy + wh) {
 981				if(abs(wx - nx) < snap)
 982					nx = wx;
 983				else if(abs((wx + ww) - (nx + WIDTH(c))) < snap)
 984					nx = wx + ww - WIDTH(c);
 985				if(abs(wy - ny) < snap)
 986					ny = wy;
 987				else if(abs((wy + wh) - (ny + HEIGHT(c))) < snap)
 988					ny = wy + wh - HEIGHT(c);
 989				if(!c->isfloating && lt[sellt]->arrange && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
 990					togglefloating(NULL);
 991			}
 992			if(!lt[sellt]->arrange || c->isfloating)
 993				resize(c, nx, ny, c->w, c->h, False);
 994			break;
 995		}
 996	}
 997	while(ev.type != ButtonRelease);
 998	if(usegrab)
 999		XUngrabServer(dpy);
1000	XUngrabPointer(dpy, CurrentTime);
1001}
1002
1003Client *
1004nexttiled(Client *c) {
1005	for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1006	return c;
1007}
1008
1009void
1010propertynotify(XEvent *e) {
1011	Client *c;
1012	Window trans;
1013	XPropertyEvent *ev = &e->xproperty;
1014
1015	if((ev->window == root) && (ev->atom = XA_WM_NAME))
1016		updatestatus();
1017	else if(ev->state == PropertyDelete)
1018		return; /* ignore */
1019	else if((c = getclient(ev->window))) {
1020		switch (ev->atom) {
1021		default: break;
1022		case XA_WM_TRANSIENT_FOR:
1023			XGetTransientForHint(dpy, c->win, &trans);
1024			if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1025				arrange();
1026			break;
1027		case XA_WM_NORMAL_HINTS:
1028			updatesizehints(c);
1029			break;
1030		case XA_WM_HINTS:
1031			updatewmhints(c);
1032			drawbar();
1033			break;
1034		}
1035		if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1036			updatetitle(c);
1037			if(c == sel)
1038				drawbar();
1039		}
1040	}
1041}
1042
1043void
1044quit(const Arg *arg) {
1045	running = False;
1046}
1047
1048void
1049resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1050	XWindowChanges wc;
1051
1052	if(sizehints) {
1053		/* see last two sentences in ICCCM 4.1.2.3 */
1054		Bool baseismin = c->basew == c->minw && c->baseh == c->minh;
1055
1056		/* set minimum possible */
1057		w = MAX(1, w);
1058		h = MAX(1, h);
1059
1060		if(!baseismin) { /* temporarily remove base dimensions */
1061			w -= c->basew;
1062			h -= c->baseh;
1063		}
1064
1065		/* adjust for aspect limits */
1066		if(c->mina > 0 && c->maxa > 0) {
1067			if(c->maxa < (float)w / h)
1068				w = h * c->maxa;
1069			else if(c->mina < (float)h / w)
1070				h = w * c->mina;
1071		}
1072
1073		if(baseismin) { /* increment calculation requires this */
1074			w -= c->basew;
1075			h -= c->baseh;
1076		}
1077
1078		/* adjust for increment value */
1079		if(c->incw)
1080			w -= w % c->incw;
1081		if(c->inch)
1082			h -= h % c->inch;
1083
1084		/* restore base dimensions */
1085		w += c->basew;
1086		h += c->baseh;
1087
1088		w = MAX(w, c->minw);
1089		h = MAX(h, c->minh);
1090
1091		if(c->maxw)
1092			w = MIN(w, c->maxw);
1093
1094		if(c->maxh)
1095			h = MIN(h, c->maxh);
1096	}
1097	if(w <= 0 || h <= 0)
1098		return;
1099	if(x > sx + sw)
1100		x = sw - WIDTH(c);
1101	if(y > sy + sh)
1102		y = sh - HEIGHT(c);
1103	if(x + w + 2 * c->bw < sx)
1104		x = sx;
1105	if(y + h + 2 * c->bw < sy)
1106		y = sy;
1107	if(h < bh)
1108		h = bh;
1109	if(w < bh)
1110		w = bh;
1111	if(c->x != x || c->y != y || c->w != w || c->h != h) {
1112		c->x = wc.x = x;
1113		c->y = wc.y = y;
1114		c->w = wc.width = w;
1115		c->h = wc.height = h;
1116		wc.border_width = c->bw;
1117		XConfigureWindow(dpy, c->win,
1118				CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1119		configure(c);
1120		XSync(dpy, False);
1121	}
1122}
1123
1124void
1125resizemouse(const Arg *arg) {
1126	int ocx, ocy;
1127	int nw, nh;
1128	Client *c;
1129	XEvent ev;
1130
1131	if(!(c = sel))
1132		return;
1133	restack();
1134	ocx = c->x;
1135	ocy = c->y;
1136	if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1137	None, cursor[CurResize], CurrentTime) != GrabSuccess)
1138		return;
1139	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1140	if(usegrab)
1141		XGrabServer(dpy);
1142	do {
1143		XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1144		switch(ev.type) {
1145		case ConfigureRequest:
1146		case Expose:
1147		case MapRequest:
1148			handler[ev.type](&ev);
1149			break;
1150		case MotionNotify:
1151			nw = MAX(ev.xmotion.x - ocx - 2*c->bw + 1, 1);
1152			nh = MAX(ev.xmotion.y - ocy - 2*c->bw + 1, 1);
1153
1154			if(snap && nw >= wx && nw <= wx + ww
1155			        && nh >= wy && nh <= wy + wh) {
1156				if(!c->isfloating && lt[sellt]->arrange
1157				   && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1158					togglefloating(NULL);
1159			}
1160			if(!lt[sellt]->arrange || c->isfloating)
1161				resize(c, c->x, c->y, nw, nh, True);
1162			break;
1163		}
1164	}
1165	while(ev.type != ButtonRelease);
1166	if(usegrab)
1167		XUngrabServer(dpy);
1168	XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1169	XUngrabPointer(dpy, CurrentTime);
1170	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1171}
1172
1173void
1174restack(void) {
1175	Client *c;
1176	XEvent ev;
1177	XWindowChanges wc;
1178
1179	drawbar();
1180	if(!sel)
1181		return;
1182	if(sel->isfloating || !lt[sellt]->arrange)
1183		XRaiseWindow(dpy, sel->win);
1184	if(lt[sellt]->arrange) {
1185		wc.stack_mode = Below;
1186		wc.sibling = barwin;
1187		for(c = stack; c; c = c->snext)
1188			if(!c->isfloating && ISVISIBLE(c)) {
1189				XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1190				wc.sibling = c->win;
1191			}
1192	}
1193	XSync(dpy, False);
1194	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1195}
1196
1197void
1198run(void) {
1199	XEvent ev;
1200
1201	/* main event loop */
1202	XSync(dpy, False);
1203	while(running && !XNextEvent(dpy, &ev)) {
1204		if(handler[ev.type])
1205			(handler[ev.type])(&ev); /* call handler */
1206	}
1207}
1208
1209void
1210scan(void) {
1211	unsigned int i, num;
1212	Window d1, d2, *wins = NULL;
1213	XWindowAttributes wa;
1214
1215	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1216		for(i = 0; i < num; i++) {
1217			if(!XGetWindowAttributes(dpy, wins[i], &wa)
1218			|| wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1219				continue;
1220			if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1221				manage(wins[i], &wa);
1222		}
1223		for(i = 0; i < num; i++) { /* now the transients */
1224			if(!XGetWindowAttributes(dpy, wins[i], &wa))
1225				continue;
1226			if(XGetTransientForHint(dpy, wins[i], &d1)
1227			&& (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1228				manage(wins[i], &wa);
1229		}
1230		if(wins)
1231			XFree(wins);
1232	}
1233}
1234
1235void
1236setclientstate(Client *c, long state) {
1237	long data[] = {state, None};
1238
1239	XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1240			PropModeReplace, (unsigned char *)data, 2);
1241}
1242
1243void
1244setlayout(const Arg *arg) {
1245	if(!arg || !arg->v || arg->v != lt[sellt])
1246		sellt ^= 1;
1247	if(arg && arg->v)
1248		lt[sellt] = (Layout *)arg->v;
1249	if(sel)
1250		arrange();
1251	else
1252		drawbar();
1253}
1254
1255/* arg > 1.0 will set mfact absolutly */
1256void
1257setmfact(const Arg *arg) {
1258	float f;
1259
1260	if(!arg || !lt[sellt]->arrange)
1261		return;
1262	f = arg->f < 1.0 ? arg->f + mfact : arg->f - 1.0;
1263	if(f < 0.1 || f > 0.9)
1264		return;
1265	mfact = f;
1266	arrange();
1267}
1268
1269void
1270setup(void) {
1271	unsigned int i;
1272	int w;
1273	XSetWindowAttributes wa;
1274
1275	/* init screen */
1276	screen = DefaultScreen(dpy);
1277	root = RootWindow(dpy, screen);
1278	initfont(font);
1279	sx = 0;
1280	sy = 0;
1281	sw = DisplayWidth(dpy, screen);
1282	sh = DisplayHeight(dpy, screen);
1283	bh = dc.h = dc.font.height + 2;
1284	lt[0] = &layouts[0];
1285	lt[1] = &layouts[1 % LENGTH(layouts)];
1286	updategeom();
1287
1288	/* init atoms */
1289	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1290	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1291	wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1292	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1293	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1294
1295	/* init cursors */
1296	wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1297	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1298	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1299
1300	/* init appearance */
1301	dc.norm[ColBorder] = getcolor(normbordercolor);
1302	dc.norm[ColBG] = getcolor(normbgcolor);
1303	dc.norm[ColFG] = getcolor(normfgcolor);
1304	dc.sel[ColBorder] = getcolor(selbordercolor);
1305	dc.sel[ColBG] = getcolor(selbgcolor);
1306	dc.sel[ColFG] = getcolor(selfgcolor);
1307	dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1308	dc.gc = XCreateGC(dpy, root, 0, 0);
1309	XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1310	if(!dc.font.set)
1311		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1312
1313	/* init bar */
1314	for(blw = i = 0; LENGTH(layouts) > 1 && i < LENGTH(layouts); i++) {
1315		w = TEXTW(layouts[i].symbol);
1316		blw = MAX(blw, w);
1317	}
1318
1319	wa.override_redirect = 1;
1320	wa.background_pixmap = ParentRelative;
1321	wa.event_mask = ButtonPressMask|ExposureMask;
1322
1323	barwin = XCreateWindow(dpy, root, wx, by, ww, bh, 0, DefaultDepth(dpy, screen),
1324			CopyFromParent, DefaultVisual(dpy, screen),
1325			CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1326	XDefineCursor(dpy, barwin, cursor[CurNormal]);
1327	XMapRaised(dpy, barwin);
1328	updatestatus();
1329
1330	/* EWMH support per view */
1331	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1332			PropModeReplace, (unsigned char *) netatom, NetLast);
1333
1334	/* select for events */
1335	wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1336			|EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1337			|PropertyChangeMask;
1338	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1339	XSelectInput(dpy, root, wa.event_mask);
1340
1341	grabkeys();
1342}
1343
1344void
1345showhide(Client *c) {
1346	if(!c)
1347		return;
1348	if(ISVISIBLE(c)) { /* show clients top down */
1349		adjustborder(c, False);
1350		XMoveWindow(dpy, c->win, c->x, c->y);
1351		if(!lt[sellt]->arrange || c->isfloating)
1352			resize(c, c->x, c->y, c->w, c->h, True);
1353		showhide(c->snext);
1354	}
1355	else { /* hide clients bottom up */
1356		showhide(c->snext);
1357		XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1358	}
1359}
1360
1361
1362void
1363sigchld(int signal) {
1364	while(0 < waitpid(-1, NULL, WNOHANG));
1365}
1366
1367void
1368spawn(const Arg *arg) {
1369	signal(SIGCHLD, sigchld);
1370	if(fork() == 0) {
1371		if(dpy)
1372			close(ConnectionNumber(dpy));
1373		setsid();
1374		execvp(((char **)arg->v)[0], (char **)arg->v);
1375		fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1376		perror(" failed");
1377		exit(0);
1378	}
1379}
1380
1381void
1382tag(const Arg *arg) {
1383	if(sel && arg->ui & TAGMASK) {
1384		sel->tags = arg->ui & TAGMASK;
1385		arrange();
1386	}
1387}
1388
1389int
1390textnw(const char *text, unsigned int len) {
1391	XRectangle r;
1392
1393	if(dc.font.set) {
1394		XmbTextExtents(dc.font.set, text, len, NULL, &r);
1395		return r.width;
1396	}
1397	return XTextWidth(dc.font.xfont, text, len);
1398}
1399
1400void
1401tile(void) {
1402	int x, y, h, w, mw;
1403	unsigned int i, n;
1404	Client *c;
1405
1406	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
1407	if(n == 0)
1408		return;
1409
1410	/* master */
1411	c = nexttiled(clients);
1412	mw = mfact * ww;
1413	adjustborder(c, n == 1);
1414	resize(c, wx, wy, (n == 1 ? ww : mw) - 2 * c->bw, wh - 2 * c->bw, resizehints);
1415
1416	if(--n == 0)
1417		return;
1418
1419	/* tile stack */
1420	x = (wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + mw;
1421	y = wy;
1422	w = (wx + mw > c->x + c->w) ? wx + ww - x : ww - mw;
1423	h = wh / n;
1424	if(h < bh)
1425		h = wh;
1426
1427	for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1428		adjustborder(c, False);
1429		resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1430		       ? wy + wh - y - 2 * c->bw : h - 2 * c->bw), resizehints);
1431		if(h != wh)
1432			y = c->y + HEIGHT(c);
1433	}
1434}
1435
1436void
1437togglebar(const Arg *arg) {
1438	showbar = !showbar;
1439	updategeom();
1440	updatebar();
1441	arrange();
1442}
1443
1444void
1445togglefloating(const Arg *arg) {
1446	if(!sel)
1447		return;
1448	sel->isfloating = !sel->isfloating || sel->isfixed;
1449	if(sel->isfloating)
1450		resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1451	arrange();
1452}
1453
1454void
1455toggletag(const Arg *arg) {
1456	unsigned int mask;
1457
1458	if (!sel)
1459		return;
1460	
1461	mask = sel->tags ^ (arg->ui & TAGMASK);
1462	if(sel && mask) {
1463		sel->tags = mask;
1464		arrange();
1465	}
1466}
1467
1468void
1469toggleview(const Arg *arg) {
1470	unsigned int mask = tagset[seltags] ^ (arg->ui & TAGMASK);
1471
1472	if(mask) {
1473		tagset[seltags] = mask;
1474		arrange();
1475	}
1476}
1477
1478void
1479unmanage(Client *c) {
1480	XWindowChanges wc;
1481
1482	wc.border_width = c->oldbw;
1483	/* The server grab construct avoids race conditions. */
1484	XGrabServer(dpy);
1485	XSetErrorHandler(xerrordummy);
1486	XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1487	detach(c);
1488	detachstack(c);
1489	if(sel == c)
1490		focus(NULL);
1491	XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1492	setclientstate(c, WithdrawnState);
1493	free(c);
1494	XSync(dpy, False);
1495	XSetErrorHandler(xerror);
1496	XUngrabServer(dpy);
1497	arrange();
1498}
1499
1500void
1501unmapnotify(XEvent *e) {
1502	Client *c;
1503	XUnmapEvent *ev = &e->xunmap;
1504
1505	if((c = getclient(ev->window)))
1506		unmanage(c);
1507}
1508
1509void
1510updatebar(void) {
1511	if(dc.drawable != 0)
1512		XFreePixmap(dpy, dc.drawable);
1513	dc.drawable = XCreatePixmap(dpy, root, ww, bh, DefaultDepth(dpy, screen));
1514	XMoveResizeWindow(dpy, barwin, wx, by, ww, bh);
1515}
1516
1517void
1518updategeom(void) {
1519#ifdef XINERAMA
1520	int n, i = 0;
1521	XineramaScreenInfo *info = NULL;
1522
1523	/* window area geometry */
1524	if(XineramaIsActive(dpy) && (info = XineramaQueryScreens(dpy, &n))) { 
1525		if(n > 1) {
1526			int di, x, y;
1527			unsigned int dui;
1528			Window dummy;
1529			if(XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui))
1530				for(i = 0; i < n; i++)
1531					if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
1532						break;
1533		}
1534		wx = info[i].x_org;
1535		wy = showbar && topbar ?  info[i].y_org + bh : info[i].y_org;
1536		ww = info[i].width;
1537		wh = showbar ? info[i].height - bh : info[i].height;
1538		XFree(info);
1539	}
1540	else
1541#endif
1542	{
1543		wx = sx;
1544		wy = showbar && topbar ? sy + bh : sy;
1545		ww = sw;
1546		wh = showbar ? sh - bh : sh;
1547	}
1548
1549	/* bar position */
1550	by = showbar ? (topbar ? wy - bh : wy + wh) : -bh;
1551}
1552
1553void
1554updatenumlockmask(void) {
1555	unsigned int i, j;
1556	XModifierKeymap *modmap;
1557
1558	numlockmask = 0;
1559	modmap = XGetModifierMapping(dpy);
1560	for(i = 0; i < 8; i++)
1561		for(j = 0; j < modmap->max_keypermod; j++)
1562			if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
1563				numlockmask = (1 << i);
1564	XFreeModifiermap(modmap);
1565}
1566
1567void
1568updatesizehints(Client *c) {
1569	long msize;
1570	XSizeHints size;
1571
1572	if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1573		/* size is uninitialized, ensure that size.flags aren't used */
1574		size.flags = PSize; 
1575	if(size.flags & PBaseSize) {
1576		c->basew = size.base_width;
1577		c->baseh = size.base_height;
1578	}
1579	else if(size.flags & PMinSize) {
1580		c->basew = size.min_width;
1581		c->baseh = size.min_height;
1582	}
1583	else
1584		c->basew = c->baseh = 0;
1585	if(size.flags & PResizeInc) {
1586		c->incw = size.width_inc;
1587		c->inch = size.height_inc;
1588	}
1589	else
1590		c->incw = c->inch = 0;
1591	if(size.flags & PMaxSize) {
1592		c->maxw = size.max_width;
1593		c->maxh = size.max_height;
1594	}
1595	else
1596		c->maxw = c->maxh = 0;
1597	if(size.flags & PMinSize) {
1598		c->minw = size.min_width;
1599		c->minh = size.min_height;
1600	}
1601	else if(size.flags & PBaseSize) {
1602		c->minw = size.base_width;
1603		c->minh = size.base_height;
1604	}
1605	else
1606		c->minw = c->minh = 0;
1607	if(size.flags & PAspect) {
1608		c->mina = (float)size.min_aspect.y / (float)size.min_aspect.x;
1609		c->maxa = (float)size.max_aspect.x / (float)size.max_aspect.y;
1610	}
1611	else
1612		c->maxa = c->mina = 0.0;
1613	c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1614	             && c->maxw == c->minw && c->maxh == c->minh);
1615}
1616
1617void
1618updatetitle(Client *c) {
1619	if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1620		gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1621}
1622
1623void
1624updatestatus() {
1625	if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1626		strcpy(stext, "dwm-"VERSION);
1627	drawbar();
1628}
1629
1630void
1631updatewmhints(Client *c) {
1632	XWMHints *wmh;
1633
1634	if((wmh = XGetWMHints(dpy, c->win))) {
1635		if(c == sel && wmh->flags & XUrgencyHint) {
1636			wmh->flags &= ~XUrgencyHint;
1637			XSetWMHints(dpy, c->win, wmh);
1638		}
1639		else
1640			c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1641
1642		XFree(wmh);
1643	}
1644}
1645
1646void
1647view(const Arg *arg) {
1648	if((arg->ui & TAGMASK) == tagset[seltags])
1649		return;
1650	seltags ^= 1; /* toggle sel tagset */
1651	if(arg->ui & TAGMASK)
1652		tagset[seltags] = arg->ui & TAGMASK;
1653	arrange();
1654}
1655
1656/* There's no way to check accesses to destroyed windows, thus those cases are
1657 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1658 * default error handler, which may call exit.  */
1659int
1660xerror(Display *dpy, XErrorEvent *ee) {
1661	if(ee->error_code == BadWindow
1662	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1663	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1664	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1665	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1666	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1667	|| (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1668	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1669	|| (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1670		return 0;
1671	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1672			ee->request_code, ee->error_code);
1673	return xerrorxlib(dpy, ee); /* may call exit */
1674}
1675
1676int
1677xerrordummy(Display *dpy, XErrorEvent *ee) {
1678	return 0;
1679}
1680
1681/* Startup Error handler to check if another window manager
1682 * is already running. */
1683int
1684xerrorstart(Display *dpy, XErrorEvent *ee) {
1685	otherwm = True;
1686	return -1;
1687}
1688
1689void
1690zoom(const Arg *arg) {
1691	Client *c = sel;
1692
1693	if(!lt[sellt]->arrange || lt[sellt]->arrange == monocle || (sel && sel->isfloating))
1694		return;
1695	if(c == nexttiled(clients))
1696		if(!c || !(c = nexttiled(c->next)))
1697			return;
1698	detach(c);
1699	attach(c);
1700	focus(c);
1701	arrange();
1702}
1703
1704int
1705main(int argc, char *argv[]) {
1706	if(argc == 2 && !strcmp("-v", argv[1]))
1707		die("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
1708	else if(argc != 1)
1709		die("usage: dwm [-v]\n");
1710
1711	if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1712		fprintf(stderr, "warning: no locale support\n");
1713
1714	if(!(dpy = XOpenDisplay(0)))
1715		die("dwm: cannot open display\n");
1716
1717	checkotherwm();
1718	setup();
1719	scan();
1720	run();
1721	cleanup();
1722
1723	XCloseDisplay(dpy);
1724	return 0;
1725}