dwm.c

   1 //#define XINULATOR /* debug, simulates dual head */
   2 /* See LICENSE file for copyright and license details.
   3  *
   4  * dynamic window manager is designed like any other X client as well. It is
   5  * driven through handling X events. In contrast to other X clients, a window
   6  * manager selects for SubstructureRedirectMask on the root window, to receive
   7  * events about window (dis-)appearance.  Only one X connection at a time is
   8  * allowed to select for this event mask.
   9  *
  10  * The event handlers of dwm are organized in an array which is accessed
  11  * whenever a new event has been fetched. This allows event dispatching
  12  * in O(1) time.
  13  *
  14  * Each child of the root window is called a client, except windows which have
  15  * set the override_redirect flag.  Clients are organized in a global
  16  * linked client list, the focus history is remembered through a global
  17  * stack list. Each client contains a bit array to indicate the tags of a
  18  * client.
  19  *
  20  * Keys and tagging rules are organized as arrays and defined in config.h.
  21  *
  22  * To understand everything else, start reading main().
  23  */
  24 #include <errno.h>
  25 #include <locale.h>
  26 #include <stdarg.h>
  27 #include <signal.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <X11/cursorfont.h>
  35 #include <X11/keysym.h>
  36 #include <X11/Xatom.h>
  37 #include <X11/Xlib.h>
  38 #include <X11/Xproto.h>
  39 #include <X11/Xutil.h>
  40 #ifdef XINERAMA
  41 #include <X11/extensions/Xinerama.h>
  42 #endif /* XINERAMA */
  43
  44 /* macros */
  45 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  46 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  47 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  48 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49 #define LENGTH(X)               (sizeof X / sizeof X[0])
  50 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  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 */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  62 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
  63 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  64        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  65
  66 typedef union {
  67         int i;
  68         unsigned int ui;
  69         float f;
  70         void *v;
  71 } Arg;
  72
  73 typedef 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
  81 typedef struct Monitor Monitor;
  82 typedef struct Client Client;
  83 struct Client {
  84         char name[256];
  85         float mina, maxa;
  86         int x, y, w, h;
  87         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  88         int bw, oldbw;
  89         unsigned int tags;
  90         Bool isfixed, isfloating, isurgent;
  91         Client *next;
  92         Client *snext;
  93         Monitor *mon;
  94         Window win;
  95 };
  96
  97 typedef struct {
  98         int x, y, w, h;
  99         unsigned long norm[ColLast];
 100         unsigned long sel[ColLast];
 101         Drawable drawable;
 102         GC gc;
 103         struct {
 104                 int ascent;
 105                 int descent;
 106                 int height;
 107                 XFontSet set;
 108                 XFontStruct *xfont;
 109         } font;
 110 } DC; /* draw context */
 111
 112 typedef struct {
 113         unsigned int mod;
 114         KeySym keysym;
 115         void (*func)(const Arg *);
 116         const Arg arg;
 117 } Key;
 118
 119 typedef struct {
 120         const char *symbol;
 121         void (*arrange)(Monitor *);
 122 } Layout;
 123
 124 struct Monitor {
 125         int screen_number;
 126         float mfact;
 127         int by, btx;          /* bar geometry */
 128         int mx, my, mw, mh;           /* screen size */
 129         int wx, wy, ww, wh;   /* window area  */
 130         unsigned int seltags;
 131         unsigned int sellt;
 132         unsigned int tagset[2];
 133         Bool showbar;
 134         Bool topbar;
 135         Client *clients;
 136         Client *sel;
 137         Client *stack;
 138         Monitor *next;
 139         Window barwin;
 140 };
 141
 142 typedef struct {
 143         const char *class;
 144         const char *instance;
 145         const char *title;
 146         unsigned int tags;
 147         Bool isfloating;
 148 } Rule;
 149
 150 /* function declarations */
 151 static void applyrules(Client *c);
 152 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h);
 153 static void arrange(void);
 154 static void attach(Client *c);
 155 static void attachstack(Client *c);
 156 static void buttonpress(XEvent *e);
 157 static void checkotherwm(void);
 158 static void cleanup(void);
 159 static void cleanupmons(void);
 160 static void clearurgent(Client *c);
 161 static void configure(Client *c);
 162 static void configurenotify(XEvent *e);
 163 static void configurerequest(XEvent *e);
 164 static void destroynotify(XEvent *e);
 165 static void detach(Client *c);
 166 static void detachstack(Client *c);
 167 static void die(const char *errstr, ...);
 168 static void drawbar(Monitor *m);
 169 static void drawbars(void);
 170 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 171 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 172 static void enternotify(XEvent *e);
 173 static void expose(XEvent *e);
 174 static void focus(Client *c);
 175 static void focusin(XEvent *e);
 176 static void focusstack(const Arg *arg);
 177 static Client *getclient(Window w);
 178 static unsigned long getcolor(const char *colstr);
 179 static Monitor *getmon(Window w);
 180 static Monitor *getmonn(unsigned int n);
 181 static Monitor *getmonxy(int x, int y);
 182 static Bool getrootpointer(int *x, int *y);
 183 static long getstate(Window w);
 184 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 185 static void grabbuttons(Client *c, Bool focused);
 186 static void grabkeys(void);
 187 static void initfont(const char *fontstr);
 188 static Bool isprotodel(Client *c);
 189 static void keypress(XEvent *e);
 190 static void killclient(const Arg *arg);
 191 static void manage(Window w, XWindowAttributes *wa);
 192 static void mappingnotify(XEvent *e);
 193 static void maprequest(XEvent *e);
 194 static void monocle(Monitor *m);
 195 static void movemouse(const Arg *arg);
 196 static Client *nexttiled(Client *c);
 197 static void propertynotify(XEvent *e);
 198 static void quit(const Arg *arg);
 199 static void resize(Client *c, int x, int y, int w, int h);
 200 static void resizemouse(const Arg *arg);
 201 static void restack(Monitor *m);
 202 static void run(void);
 203 static void scan(void);
 204 static void sendmon(Client *c, Monitor *m);
 205 static void setclientstate(Client *c, long state);
 206 static void setlayout(const Arg *arg);
 207 static void setmfact(const Arg *arg);
 208 static void setup(void);
 209 static void showhide(Client *c);
 210 static void sigchld(int signal);
 211 static void spawn(const Arg *arg);
 212 static void tag(const Arg *arg);
 213 static int textnw(const char *text, unsigned int len);
 214 static void tile(Monitor *);
 215 static void togglebar(const Arg *arg);
 216 static void togglefloating(const Arg *arg);
 217 static void toggletag(const Arg *arg);
 218 static void toggleview(const Arg *arg);
 219 static void unfocus(Client *c);
 220 static void unmanage(Client *c);
 221 static void unmapnotify(XEvent *e);
 222 static void updategeom(void);
 223 static void updatebarpos(Monitor *m);
 224 static void updatebars(void);
 225 static void updatenumlockmask(void);
 226 static void updatesizehints(Client *c);
 227 static void updatestatus(void);
 228 static void updatetitle(Client *c);
 229 static void updatewmhints(Client *c);
 230 static void view(const Arg *arg);
 231 static int xerror(Display *dpy, XErrorEvent *ee);
 232 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 233 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 234 static void zoom(const Arg *arg);
 235 #ifdef XINERAMA
 236 static void focusmon(const Arg *arg);
 237 static void tagmon(const Arg *arg);
 238 #endif /* XINERAMA */
 239
 240 /* variables */
 241 static char stext[256];
 242 static int screen;
 243 static int sx, sy, sw, sh;   /* X display screen geometry x, y, width, height */
 244 static int bh, blw = 0;      /* bar geometry */
 245 static int (*xerrorxlib)(Display *, XErrorEvent *);
 246 static unsigned int numlockmask = 0;
 247 static void (*handler[LASTEvent]) (XEvent *) = {
 248         [ButtonPress] = buttonpress,
 249         [ConfigureRequest] = configurerequest,
 250         [ConfigureNotify] = configurenotify,
 251         [DestroyNotify] = destroynotify,
 252         [EnterNotify] = enternotify,
 253         [Expose] = expose,
 254         [FocusIn] = focusin,
 255         [KeyPress] = keypress,
 256         [MappingNotify] = mappingnotify,
 257         [MapRequest] = maprequest,
 258         [PropertyNotify] = propertynotify,
 259         [UnmapNotify] = unmapnotify
 260 };
 261 static Atom wmatom[WMLast], netatom[NetLast];
 262 static Bool otherwm;
 263 static Bool running = True;
 264 static Cursor cursor[CurLast];
 265 static Display *dpy;
 266 static DC dc;
 267 static Layout *lt[] = { NULL, NULL };
 268 static Monitor *mons = NULL, *selmon = NULL;
 269 static Window root;
 270 /* configuration, allows nested code to access above variables */
 271 #include "config.h"
 272
 273 /* compile-time check if all tags fit into an unsigned int bit array. */
 274 struct NumTags { char limitexceeded[sizeof(unsigned int) * 8 < LENGTH(tags) ? -1 : 1]; };
 275
 276 /* function implementations */
 277 void
 278 applyrules(Client *c) {
 279         unsigned int i;
 280         Rule *r;
 281         XClassHint ch = { 0 };
 282
 283         /* rule matching */
 284         c->isfloating = c->tags = 0;
 285         if(XGetClassHint(dpy, c->win, &ch)) {
 286                 for(i = 0; i < LENGTH(rules); i++) {
 287                         r = &rules[i];
 288                         if((!r->title || strstr(c->name, r->title))
 289                         && (!r->class || (ch.res_class && strstr(ch.res_class, r->class)))
 290                         && (!r->instance || (ch.res_name && strstr(ch.res_name, r->instance)))) {
 291                                 c->isfloating = r->isfloating;
 292                                 c->tags |= r->tags;
 293                         }
 294                 }
 295                 if(ch.res_class)
 296                         XFree(ch.res_class);
 297                 if(ch.res_name)
 298                         XFree(ch.res_name);
 299         }
 300         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 301 }
 302
 303 Bool
 304 applysizehints(Client *c, int *x, int *y, int *w, int *h) {
 305         Bool baseismin;
 306
 307         /* set minimum possible */
 308         *w = MAX(1, *w);
 309         *h = MAX(1, *h);
 310
 311         if(*x > sx + sw)
 312                 *x = sw - WIDTH(c);
 313         if(*y > sy + sh)
 314                 *y = sh - HEIGHT(c);
 315         if(*x + *w + 2 * c->bw < sx)
 316                 *x = sx;
 317         if(*y + *h + 2 * c->bw < sy)
 318                 *y = sy;
 319         if(*h < bh)
 320                 *h = bh;
 321         if(*w < bh)
 322                 *w = bh;
 323
 324         if(resizehints || c->isfloating) {
 325                 /* see last two sentences in ICCCM 4.1.2.3 */
 326                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 327
 328                 if(!baseismin) { /* temporarily remove base dimensions */
 329                         *w -= c->basew;
 330                         *h -= c->baseh;
 331                 }
 332
 333                 /* adjust for aspect limits */
 334                 if(c->mina > 0 && c->maxa > 0) {
 335                         if(c->maxa < (float)*w / *h)
 336                                 *w = *h * c->maxa;
 337                         else if(c->mina < (float)*h / *w)
 338                                 *h = *w * c->mina;
 339                 }
 340
 341                 if(baseismin) { /* increment calculation requires this */
 342                         *w -= c->basew;
 343                         *h -= c->baseh;
 344                 }
 345
 346                 /* adjust for increment value */
 347                 if(c->incw)
 348                         *w -= *w % c->incw;
 349                 if(c->inch)
 350                         *h -= *h % c->inch;
 351
 352                 /* restore base dimensions */
 353                 *w += c->basew;
 354                 *h += c->baseh;
 355
 356                 *w = MAX(*w, c->minw);
 357                 *h = MAX(*h, c->minh);
 358
 359                 if(c->maxw)
 360                         *w = MIN(*w, c->maxw);
 361
 362                 if(c->maxh)
 363                         *h = MIN(*h, c->maxh);
 364         }
 365         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 366 }
 367
 368 void
 369 arrange(void) {
 370         Monitor *m;
 371
 372         /* optimise two loops into one, check focus(NULL) */
 373         for(m = mons; m; m = m->next)
 374                 showhide(m->stack);
 375         focus(NULL);
 376         for(m = mons; m; m = m->next) {
 377                 if(lt[m->sellt]->arrange)
 378                         lt[m->sellt]->arrange(m);
 379                 restack(m);
 380         }
 381 }
 382
 383 void
 384 attach(Client *c) {
 385         c->next = c->mon->clients;
 386         c->mon->clients = c;
 387 }
 388
 389 void
 390 attachstack(Client *c) {
 391         c->snext = c->mon->stack;
 392         c->mon->stack = c;
 393 }
 394
 395 void
 396 buttonpress(XEvent *e) {
 397         unsigned int i, x, click;
 398         Arg arg = {0};
 399         Client *c;
 400         Monitor *m;
 401         XButtonPressedEvent *ev = &e->xbutton;
 402
 403         click = ClkRootWin;
 404         /* focus monitor if necessary */
 405         if((m = getmon(ev->window)) && m != selmon) {
 406                 unfocus(selmon->sel);
 407                 selmon = m;
 408                 focus(NULL);
 409         }
 410         if(ev->window == selmon->barwin && ev->x >= selmon->btx) {
 411                 i = 0;
 412                 x = selmon->btx;
 413                 do
 414                         x += TEXTW(tags[i]);
 415                 while(ev->x >= x && ++i < LENGTH(tags));
 416                 if(i < LENGTH(tags)) {
 417                         click = ClkTagBar;
 418                         arg.ui = 1 << i;
 419                 }
 420                 else if(ev->x < x + blw)
 421                         click = ClkLtSymbol;
 422                 else if(ev->x > selmon->wx + selmon->ww - TEXTW(stext))
 423                         click = ClkStatusText;
 424                 else
 425                         click = ClkWinTitle;
 426         }
 427         else if((c = getclient(ev->window))) {
 428                 focus(c);
 429                 click = ClkClientWin;
 430         }
 431
 432         for(i = 0; i < LENGTH(buttons); i++)
 433                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 434                    && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 435                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 436 }
 437
 438 void
 439 checkotherwm(void) {
 440         otherwm = False;
 441         xerrorxlib = XSetErrorHandler(xerrorstart);
 442
 443         /* this causes an error if some other window manager is running */
 444         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 445         XSync(dpy, False);
 446         if(otherwm)
 447                 die("dwm: another window manager is already running\n");
 448         XSetErrorHandler(xerror);
 449         XSync(dpy, False);
 450 }
 451
 452 void
 453 cleanup(void) {
 454         Arg a = {.ui = ~0};
 455         Layout foo = { "", NULL };
 456         Monitor *m;
 457
 458         view(&a);
 459         lt[selmon->sellt] = &foo;
 460
 461         /* TODO: consider simplifying cleanup code of the stack, perhaps do that in cleanmons() ? */
 462         for(m = mons; m; m = m->next)
 463                 while(m->stack)
 464                         unmanage(m->stack);
 465         if(dc.font.set)
 466                 XFreeFontSet(dpy, dc.font.set);
 467         else
 468                 XFreeFont(dpy, dc.font.xfont);
 469         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 470         XFreePixmap(dpy, dc.drawable);
 471         XFreeGC(dpy, dc.gc);
 472         XFreeCursor(dpy, cursor[CurNormal]);
 473         XFreeCursor(dpy, cursor[CurResize]);
 474         XFreeCursor(dpy, cursor[CurMove]);
 475         cleanupmons();
 476         XSync(dpy, False);
 477         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 478 }
 479
 480 void
 481 cleanupmons(void) {
 482         Monitor *m;
 483
 484         while(mons) {
 485                 m = mons->next;
 486                 XUnmapWindow(dpy, mons->barwin);
 487                 XDestroyWindow(dpy, mons->barwin);
 488                 free(mons);
 489                 mons = m;
 490         }
 491 }
 492
 493 void
 494 clearurgent(Client *c) {
 495         XWMHints *wmh;
 496
 497         c->isurgent = False;
 498         if(!(wmh = XGetWMHints(dpy, c->win)))
 499                 return;
 500         wmh->flags &= ~XUrgencyHint;
 501         XSetWMHints(dpy, c->win, wmh);
 502         XFree(wmh);
 503 }
 504
 505 void
 506 configure(Client *c) {
 507         XConfigureEvent ce;
 508
 509         ce.type = ConfigureNotify;
 510         ce.display = dpy;
 511         ce.event = c->win;
 512         ce.window = c->win;
 513         ce.x = c->x;
 514         ce.y = c->y;
 515         ce.width = c->w;
 516         ce.height = c->h;
 517         ce.border_width = c->bw;
 518         ce.above = None;
 519         ce.override_redirect = False;
 520         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 521 }
 522
 523 void
 524 configurenotify(XEvent *e) {
 525         Monitor *m;
 526         XConfigureEvent *ev = &e->xconfigure;
 527
 528         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 529                 sw = ev->width;
 530                 sh = ev->height;
 531                 updategeom();
 532                 if(dc.drawable != 0)
 533                         XFreePixmap(dpy, dc.drawable);
 534                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 535                 updatebars();
 536                 for(m = mons; m; m = m->next)
 537                         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 538                 arrange();
 539         }
 540 }
 541
 542 void
 543 configurerequest(XEvent *e) {
 544         Client *c;
 545         Monitor *m;
 546         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 547         XWindowChanges wc;
 548
 549         if((c = getclient(ev->window))) {
 550                 if(ev->value_mask & CWBorderWidth)
 551                         c->bw = ev->border_width;
 552                 else if(c->isfloating || !lt[selmon->sellt]->arrange) {
 553                         m = c->mon;
 554                         if(ev->value_mask & CWX)
 555                                 c->x = m->mx + ev->x;
 556                         if(ev->value_mask & CWY)
 557                                 c->y = m->my + ev->y;
 558                         if(ev->value_mask & CWWidth)
 559                                 c->w = ev->width;
 560                         if(ev->value_mask & CWHeight)
 561                                 c->h = ev->height;
 562                         if((c->x - m->mx + c->w) > m->mw && c->isfloating)
 563                                 c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 564                         if((c->y - m->my + c->h) > m->mh && c->isfloating)
 565                                 c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 566                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 567                                 configure(c);
 568                         if(ISVISIBLE(c))
 569                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 570                 }
 571                 else
 572                         configure(c);
 573         }
 574         else {
 575                 wc.x = ev->x;
 576                 wc.y = ev->y;
 577                 wc.width = ev->width;
 578                 wc.height = ev->height;
 579                 wc.border_width = ev->border_width;
 580                 wc.sibling = ev->above;
 581                 wc.stack_mode = ev->detail;
 582                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 583         }
 584         XSync(dpy, False);
 585 }
 586
 587 void
 588 destroynotify(XEvent *e) {
 589         Client *c;
 590         XDestroyWindowEvent *ev = &e->xdestroywindow;
 591
 592         if((c = getclient(ev->window)))
 593                 unmanage(c);
 594 }
 595
 596 void
 597 detach(Client *c) {
 598         Client **tc;
 599
 600         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 601         *tc = c->next;
 602 }
 603
 604 void
 605 detachstack(Client *c) {
 606         Client **tc;
 607
 608         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 609         *tc = c->snext;
 610 }
 611
 612 void
 613 die(const char *errstr, ...) {
 614         va_list ap;
 615
 616         va_start(ap, errstr);
 617         vfprintf(stderr, errstr, ap);
 618         va_end(ap);
 619         exit(EXIT_FAILURE);
 620 }
 621
 622 void
 623 drawbar(Monitor *m) {
 624         int x;
 625         unsigned int i, occ = 0, urg = 0;
 626         unsigned long *col;
 627         Client *c;
 628
 629         for(c = m->clients; c; c = c->next) {
 630                 occ |= c->tags;
 631                 if(c->isurgent)
 632                         urg |= c->tags;
 633         }
 634
 635         dc.x = 0;
 636 #ifdef XINERAMA
 637         {
 638                 char buf[2];
 639                 buf[0] = m->screen_number + '0';
 640                 buf[1] = '\0';
 641                 dc.w = TEXTW(buf);
 642                 drawtext(buf, selmon == m ? dc.sel : dc.norm, True);
 643                 dc.x += dc.w;
 644         }
 645 #endif /* XINERAMA */
 646         m->btx = dc.x;
 647         for(i = 0; i < LENGTH(tags); i++) {
 648                 dc.w = TEXTW(tags[i]);
 649                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 650                 drawtext(tags[i], col, urg & 1 << i);
 651                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 652                            occ & 1 << i, urg & 1 << i, col);
 653                 dc.x += dc.w;
 654         }
 655         if(blw > 0) {
 656                 dc.w = blw;
 657                 drawtext(lt[m->sellt]->symbol, dc.norm, False);
 658                 x = dc.x + dc.w;
 659         }
 660         else
 661                 x = dc.x;
 662         if(m == selmon) { /* status is only drawn on selected monitor */
 663                 dc.w = TEXTW(stext);
 664                 dc.x = m->ww - dc.w;
 665                 if(dc.x < x) {
 666                         dc.x = x;
 667                         dc.w = m->ww - x;
 668                 }
 669                 drawtext(stext, dc.norm, False);
 670         }
 671         else {
 672                 dc.x = m->ww;
 673         }
 674         if((dc.w = dc.x - x) > bh) {
 675                 dc.x = x;
 676                 if(m->sel) {
 677                         col = m == selmon ? dc.sel : dc.norm;
 678                         drawtext(m->sel->name, col, False);
 679                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 680                 }
 681                 else
 682                         drawtext(NULL, dc.norm, False);
 683         }
 684         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 685         XSync(dpy, False);
 686 }
 687
 688 void
 689 drawbars(void) {
 690         Monitor *m;
 691
 692         for(m = mons; m; m = m->next)
 693                 drawbar(m);
 694 }
 695
 696 void
 697 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 698         int x;
 699         XGCValues gcv;
 700         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 701
 702         gcv.foreground = col[invert ? ColBG : ColFG];
 703         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 704         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 705         r.x = dc.x + 1;
 706         r.y = dc.y + 1;
 707         if(filled) {
 708                 r.width = r.height = x + 1;
 709                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 710         }
 711         else if(empty) {
 712                 r.width = r.height = x;
 713                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 714         }
 715 }
 716
 717 void
 718 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 719         char buf[256];
 720         int i, x, y, h, len, olen;
 721         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 722
 723         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 724         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 725         if(!text)
 726                 return;
 727         olen = strlen(text);
 728         h = dc.font.ascent + dc.font.descent;
 729         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 730         x = dc.x + (h / 2);
 731         /* shorten text if necessary */
 732         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 733         if(!len)
 734                 return;
 735         memcpy(buf, text, len);
 736         if(len < olen)
 737                 for(i = len; i && i > len - 3; buf[--i] = '.');
 738         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 739         if(dc.font.set)
 740                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 741         else
 742                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 743 }
 744
 745 void
 746 enternotify(XEvent *e) {
 747         Client *c;
 748         Monitor *m;
 749         XCrossingEvent *ev = &e->xcrossing;
 750
 751         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 752                 return;
 753         if((m = getmon(ev->window)) && m != selmon) {
 754                 unfocus(selmon->sel);
 755                 selmon = m;
 756         }
 757         if((c = getclient(ev->window)))
 758                 focus(c);
 759         else
 760                 focus(NULL);
 761 }
 762
 763 void
 764 expose(XEvent *e) {
 765         Monitor *m;
 766         XExposeEvent *ev = &e->xexpose;
 767
 768         if(ev->count == 0 && (m = getmon(ev->window)))
 769                 drawbar(m);
 770 }
 771
 772 void
 773 focus(Client *c) {
 774         if(!c || !ISVISIBLE(c))
 775                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 776         if(selmon->sel)
 777                 unfocus(selmon->sel);
 778         if(c) {
 779                 if(c->mon != selmon)
 780                         selmon = c->mon;
 781                 if(c->isurgent)
 782                         clearurgent(c);
 783                 detachstack(c);
 784                 attachstack(c);
 785                 grabbuttons(c, True);
 786                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 787                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 788         }
 789         else
 790                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 791         selmon->sel = c;
 792         drawbars();
 793 }
 794
 795 void
 796 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 797         XFocusChangeEvent *ev = &e->xfocus;
 798
 799         if(selmon->sel && ev->window != selmon->sel->win)
 800                 XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 801 }
 802
 803 #ifdef XINERAMA
 804 void
 805 focusmon(const Arg *arg) {
 806         Monitor *m;
 807
 808         if(!(m = getmonn(arg->ui)) || m == selmon)
 809                 return;
 810         unfocus(selmon->sel);
 811         selmon = m;
 812         focus(NULL);
 813 }
 814 #endif /* XINERAMA */
 815
 816 void
 817 focusstack(const Arg *arg) {
 818         Client *c = NULL, *i;
 819
 820         if(!selmon->sel)
 821                 return;
 822         if(arg->i > 0) {
 823                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 824                 if(!c)
 825                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 826         }
 827         else {
 828                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 829                         if(ISVISIBLE(i))
 830                                 c = i;
 831                 if(!c)
 832                         for(; i; i = i->next)
 833                                 if(ISVISIBLE(i))
 834                                         c = i;
 835         }
 836         if(c) {
 837                 focus(c);
 838                 restack(selmon);
 839         }
 840 }
 841
 842 Client *
 843 getclient(Window w) {
 844         Client *c;
 845         Monitor *m;
 846
 847         for(m = mons; m; m = m->next)
 848                 for(c = m->clients; c; c = c->next)
 849                         if(c->win == w)
 850                                 return c;
 851         return NULL;
 852 }
 853
 854 unsigned long
 855 getcolor(const char *colstr) {
 856         Colormap cmap = DefaultColormap(dpy, screen);
 857         XColor color;
 858
 859         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 860                 die("error, cannot allocate color '%s'\n", colstr);
 861         return color.pixel;
 862 }
 863
 864 Monitor *
 865 getmon(Window w) {
 866         int x, y;
 867         Client *c;
 868         Monitor *m;
 869
 870         if(w == root && getrootpointer(&x, &y))
 871                 return getmonxy(x, y);
 872         for(m = mons; m; m = m->next)
 873                 if(w == m->barwin)
 874                         return m;
 875         if((c = getclient(w)))
 876                 return c->mon;
 877         return mons;
 878 }
 879
 880 Monitor *
 881 getmonn(unsigned int n) {
 882         unsigned int i;
 883         Monitor *m;
 884
 885         for(m = mons, i = 0; m && i != n; m = m->next, i++);
 886         return m;
 887 }
 888
 889 Monitor *
 890 getmonxy(int x, int y) {
 891         Monitor *m;
 892
 893         for(m = mons; m; m = m->next)
 894                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
 895                         return m;
 896         return mons;
 897 }
 898
 899 Bool
 900 getrootpointer(int *x, int *y) {
 901         int di;
 902         unsigned int dui;
 903         Window dummy;
 904         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 905 }
 906
 907 long
 908 getstate(Window w) {
 909         int format, status;
 910         long result = -1;
 911         unsigned char *p = NULL;
 912         unsigned long n, extra;
 913         Atom real;
 914
 915         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 916                         &real, &format, &n, &extra, (unsigned char **)&p);
 917         if(status != Success)
 918                 return -1;
 919         if(n != 0)
 920                 result = *p;
 921         XFree(p);
 922         return result;
 923 }
 924
 925 Bool
 926 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 927         char **list = NULL;
 928         int n;
 929         XTextProperty name;
 930
 931         if(!text || size == 0)
 932                 return False;
 933         text[0] = '\0';
 934         XGetTextProperty(dpy, w, &name, atom);
 935         if(!name.nitems)
 936                 return False;
 937         if(name.encoding == XA_STRING)
 938                 strncpy(text, (char *)name.value, size - 1);
 939         else {
 940                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 941                 && n > 0 && *list) {
 942                         strncpy(text, *list, size - 1);
 943                         XFreeStringList(list);
 944                 }
 945         }
 946         text[size - 1] = '\0';
 947         XFree(name.value);
 948         return True;
 949 }
 950
 951 void
 952 grabbuttons(Client *c, Bool focused) {
 953         updatenumlockmask();
 954         {
 955                 unsigned int i, j;
 956                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 957                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 958                 if(focused) {
 959                         for(i = 0; i < LENGTH(buttons); i++)
 960                                 if(buttons[i].click == ClkClientWin)
 961                                         for(j = 0; j < LENGTH(modifiers); j++)
 962                                                 XGrabButton(dpy, buttons[i].button,
 963                                                             buttons[i].mask | modifiers[j],
 964                                                             c->win, False, BUTTONMASK,
 965                                                             GrabModeAsync, GrabModeSync, None, None);
 966                 } else
 967                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 968                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 969         }
 970 }
 971
 972 void
 973 grabkeys(void) {
 974         updatenumlockmask();
 975         { /* grab keys */
 976                 unsigned int i, j;
 977                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 978                 KeyCode code;
 979
 980                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 981                 for(i = 0; i < LENGTH(keys); i++) {
 982                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 983                                 for(j = 0; j < LENGTH(modifiers); j++)
 984                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 985                                                  True, GrabModeAsync, GrabModeAsync);
 986                 }
 987         }
 988 }
 989
 990 void
 991 initfont(const char *fontstr) {
 992         char *def, **missing;
 993         int i, n;
 994
 995         missing = NULL;
 996         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 997         if(missing) {
 998                 while(n--)
 999                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1000                 XFreeStringList(missing);
1001         }
1002         if(dc.font.set) {
1003                 XFontSetExtents *font_extents;
1004                 XFontStruct **xfonts;
1005                 char **font_names;
1006                 dc.font.ascent = dc.font.descent = 0;
1007                 font_extents = XExtentsOfFontSet(dc.font.set);
1008                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1009                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
1010                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1011                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1012                         xfonts++;
1013                 }
1014         }
1015         else {
1016                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1017                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1018                         die("error, cannot load font: '%s'\n", fontstr);
1019                 dc.font.ascent = dc.font.xfont->ascent;
1020                 dc.font.descent = dc.font.xfont->descent;
1021         }
1022         dc.font.height = dc.font.ascent + dc.font.descent;
1023 }
1024
1025 Bool
1026 isprotodel(Client *c) {
1027         int i, n;
1028         Atom *protocols;
1029         Bool ret = False;
1030
1031         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1032                 for(i = 0; !ret && i < n; i++)
1033                         if(protocols[i] == wmatom[WMDelete])
1034                                 ret = True;
1035                 XFree(protocols);
1036         }
1037         return ret;
1038 }
1039
1040 void
1041 keypress(XEvent *e) {
1042         unsigned int i;
1043         KeySym keysym;
1044         XKeyEvent *ev;
1045
1046         ev = &e->xkey;
1047         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1048         for(i = 0; i < LENGTH(keys); i++)
1049                 if(keysym == keys[i].keysym
1050                    && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1051                    && keys[i].func)
1052                         keys[i].func(&(keys[i].arg));
1053 }
1054
1055 void
1056 killclient(const Arg *arg) {
1057         XEvent ev;
1058
1059         if(!selmon->sel)
1060                 return;
1061         if(isprotodel(selmon->sel)) {
1062                 ev.type = ClientMessage;
1063                 ev.xclient.window = selmon->sel->win;
1064                 ev.xclient.message_type = wmatom[WMProtocols];
1065                 ev.xclient.format = 32;
1066                 ev.xclient.data.l[0] = wmatom[WMDelete];
1067                 ev.xclient.data.l[1] = CurrentTime;
1068                 XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1069         }
1070         else
1071                 XKillClient(dpy, selmon->sel->win);
1072 }
1073
1074 void
1075 manage(Window w, XWindowAttributes *wa) {
1076         static Client cz;
1077         Client *c, *t = NULL;
1078         Window trans = None;
1079         XWindowChanges wc;
1080
1081         if(!(c = malloc(sizeof(Client))))
1082                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1083         *c = cz;
1084         c->win = w;
1085         c->mon = selmon;
1086
1087         /* geometry */
1088         c->x = wa->x + selmon->wx;
1089         c->y = wa->y + selmon->wy;
1090         c->w = wa->width;
1091         c->h = wa->height;
1092         c->oldbw = wa->border_width;
1093         if(c->w == selmon->mw && c->h == selmon->mh) {
1094                 c->x = selmon->mx;
1095                 c->y = selmon->my;
1096                 c->bw = 0;
1097         }
1098         else {
1099                 if(c->x + WIDTH(c) > selmon->mx + selmon->mw)
1100                         c->x = selmon->mx + selmon->mw - WIDTH(c);
1101                 if(c->y + HEIGHT(c) > selmon->my + selmon->mh)
1102                         c->y = selmon->my + selmon->mh - HEIGHT(c);
1103                 c->x = MAX(c->x, selmon->mx);
1104                 /* only fix client y-offset, if the client center might cover the bar */
1105                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1106                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : selmon->my);
1107                 c->bw = borderpx;
1108         }
1109
1110         wc.border_width = c->bw;
1111         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1112         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1113         configure(c); /* propagates border_width, if size doesn't change */
1114         updatesizehints(c);
1115         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1116         grabbuttons(c, False);
1117         updatetitle(c);
1118         if(XGetTransientForHint(dpy, w, &trans))
1119                 t = getclient(trans);
1120         if(t)
1121                 c->tags = t->tags;
1122         else
1123                 applyrules(c);
1124         if(!c->isfloating)
1125                 c->isfloating = trans != None || c->isfixed;
1126         if(c->isfloating)
1127                 XRaiseWindow(dpy, c->win);
1128         attach(c);
1129         attachstack(c);
1130         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1131         XMapWindow(dpy, c->win);
1132         setclientstate(c, NormalState);
1133         arrange();
1134 }
1135
1136 void
1137 mappingnotify(XEvent *e) {
1138         XMappingEvent *ev = &e->xmapping;
1139
1140         XRefreshKeyboardMapping(ev);
1141         if(ev->request == MappingKeyboard)
1142                 grabkeys();
1143 }
1144
1145 void
1146 maprequest(XEvent *e) {
1147         static XWindowAttributes wa;
1148         XMapRequestEvent *ev = &e->xmaprequest;
1149
1150         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1151                 return;
1152         if(wa.override_redirect)
1153                 return;
1154         if(!getclient(ev->window))
1155                 manage(ev->window, &wa);
1156 }
1157
1158 void
1159 monocle(Monitor *m) {
1160         Client *c;
1161
1162         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1163                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw);
1164 }
1165
1166 void
1167 movemouse(const Arg *arg) {
1168         int x, y, ocx, ocy, nx, ny;
1169         Client *c;
1170         Monitor *m;
1171         XEvent ev;
1172
1173         if(!(c = selmon->sel))
1174                 return;
1175         restack(selmon);
1176         ocx = c->x;
1177         ocy = c->y;
1178         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1179         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1180                 return;
1181         if(!getrootpointer(&x, &y))
1182                 return;
1183         do {
1184                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1185                 switch (ev.type) {
1186                 case ConfigureRequest:
1187                 case Expose:
1188                 case MapRequest:
1189                         handler[ev.type](&ev);
1190                         break;
1191                 case MotionNotify:
1192                         nx = ocx + (ev.xmotion.x - x);
1193                         ny = ocy + (ev.xmotion.y - y);
1194                         if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1195                                 && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1196                                 if(abs(selmon->wx - nx) < snap)
1197                                         nx = selmon->wx;
1198                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1199                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1200                                 if(abs(selmon->wy - ny) < snap)
1201                                         ny = selmon->wy;
1202                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1203                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1204                                 if(!c->isfloating && lt[selmon->sellt]->arrange
1205                                                   && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1206                                         togglefloating(NULL);
1207                         }
1208                         if(!lt[selmon->sellt]->arrange || c->isfloating)
1209                                 resize(c, nx, ny, c->w, c->h);
1210                         break;
1211                 }
1212         }
1213         while(ev.type != ButtonRelease);
1214         XUngrabPointer(dpy, CurrentTime);
1215         if((m = getmonxy(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1216                 sendmon(c, m);
1217                 selmon = m;
1218                 focus(NULL);
1219         }
1220 }
1221
1222 Client *
1223 nexttiled(Client *c) {
1224         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1225         return c;
1226 }
1227
1228 void
1229 propertynotify(XEvent *e) {
1230         Client *c;
1231         Window trans;
1232         XPropertyEvent *ev = &e->xproperty;
1233
1234         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1235                 updatestatus();
1236         else if(ev->state == PropertyDelete)
1237                 return; /* ignore */
1238         else if((c = getclient(ev->window))) {
1239                 switch (ev->atom) {
1240                 default: break;
1241                 case XA_WM_TRANSIENT_FOR:
1242                         XGetTransientForHint(dpy, c->win, &trans);
1243                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1244                                 arrange();
1245                         break;
1246                 case XA_WM_NORMAL_HINTS:
1247                         updatesizehints(c);
1248                         break;
1249                 case XA_WM_HINTS:
1250                         updatewmhints(c);
1251                         drawbars();
1252                         break;
1253                 }
1254                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1255                         updatetitle(c);
1256                         if(c == selmon->sel)
1257                                 drawbars();
1258                 }
1259         }
1260 }
1261
1262 void
1263 quit(const Arg *arg) {
1264         running = False;
1265 }
1266
1267 void
1268 resize(Client *c, int x, int y, int w, int h) {
1269         XWindowChanges wc;
1270
1271         if(applysizehints(c, &x, &y, &w, &h)) {
1272                 c->x = wc.x = x;
1273                 c->y = wc.y = y;
1274                 c->w = wc.width = w;
1275                 c->h = wc.height = h;
1276                 wc.border_width = c->bw;
1277                 XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1278                 configure(c);
1279                 XSync(dpy, False);
1280         }
1281 }
1282
1283 void
1284 resizemouse(const Arg *arg) {
1285         int ocx, ocy;
1286         int nw, nh;
1287         Client *c;
1288         Monitor *m;
1289         XEvent ev;
1290
1291         if(!(c = selmon->sel))
1292                 return;
1293         restack(selmon);
1294         ocx = c->x;
1295         ocy = c->y;
1296         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1297         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1298                 return;
1299         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1300         do {
1301                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1302                 switch(ev.type) {
1303                 case ConfigureRequest:
1304                 case Expose:
1305                 case MapRequest:
1306                         handler[ev.type](&ev);
1307                         break;
1308                 case MotionNotify:
1309                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1310                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1311
1312                         if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1313                                 && nh >= selmon->wy && nh <= selmon->wy + selmon->wh) {
1314                                 if(!c->isfloating && lt[selmon->sellt]->arrange
1315                                    && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1316                                         togglefloating(NULL);
1317                         }
1318                         if(!lt[selmon->sellt]->arrange || c->isfloating)
1319                                 resize(c, c->x, c->y, nw, nh);
1320                         break;
1321                 }
1322         }
1323         while(ev.type != ButtonRelease);
1324         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1325         XUngrabPointer(dpy, CurrentTime);
1326         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1327         if((m = getmonxy(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1328                 sendmon(c, m);
1329                 selmon = m;
1330                 focus(NULL);
1331         }
1332 }
1333
1334 void
1335 restack(Monitor *m) {
1336         Client *c;
1337         XEvent ev;
1338         XWindowChanges wc;
1339
1340         drawbars();
1341         if(!m->sel)
1342                 return;
1343         if(m->sel->isfloating || !lt[m->sellt]->arrange)
1344                 XRaiseWindow(dpy, m->sel->win);
1345         if(lt[m->sellt]->arrange) {
1346                 wc.stack_mode = Below;
1347                 wc.sibling = m->barwin;
1348                 for(c = m->stack; c; c = c->snext)
1349                         if(!c->isfloating && ISVISIBLE(c)) {
1350                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1351                                 wc.sibling = c->win;
1352                         }
1353         }
1354         XSync(dpy, False);
1355         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1356 }
1357
1358 void
1359 run(void) {
1360         XEvent ev;
1361
1362         /* main event loop */
1363         XSync(dpy, False);
1364         while(running && !XNextEvent(dpy, &ev)) {
1365                 if(handler[ev.type])
1366                         (handler[ev.type])(&ev); /* call handler */
1367         }
1368 }
1369
1370 void
1371 scan(void) {
1372         unsigned int i, num;
1373         Window d1, d2, *wins = NULL;
1374         XWindowAttributes wa;
1375
1376         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1377                 for(i = 0; i < num; i++) {
1378                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1379                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1380                                 continue;
1381                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1382                                 manage(wins[i], &wa);
1383                 }
1384                 for(i = 0; i < num; i++) { /* now the transients */
1385                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1386                                 continue;
1387                         if(XGetTransientForHint(dpy, wins[i], &d1)
1388                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1389                                 manage(wins[i], &wa);
1390                 }
1391                 if(wins)
1392                         XFree(wins);
1393         }
1394 }
1395
1396 void
1397 sendmon(Client *c, Monitor *m) {
1398         if(c->mon == m)
1399                 return;
1400         detach(c);
1401         detachstack(c);
1402         c->mon = m;
1403         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1404         attach(c);
1405         attachstack(c);
1406         focus(NULL);
1407         arrange();
1408 }
1409
1410 void
1411 setclientstate(Client *c, long state) {
1412         long data[] = {state, None};
1413
1414         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1415                         PropModeReplace, (unsigned char *)data, 2);
1416 }
1417
1418 void
1419 setlayout(const Arg *arg) {
1420         if(!arg || !arg->v || arg->v != lt[selmon->sellt])
1421                 selmon->sellt ^= 1;
1422         if(arg && arg->v)
1423                 lt[selmon->sellt] = (Layout *)arg->v;
1424         if(selmon->sel)
1425                 arrange();
1426         else
1427                 drawbars();
1428 }
1429
1430 /* arg > 1.0 will set mfact absolutly */
1431 void
1432 setmfact(const Arg *arg) {
1433         float f;
1434
1435         if(!arg || !lt[selmon->sellt]->arrange)
1436                 return;
1437         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1438         if(f < 0.1 || f > 0.9)
1439                 return;
1440         selmon->mfact = f;
1441         arrange();
1442 }
1443
1444 void
1445 setup(void) {
1446         unsigned int i;
1447         int w;
1448         XSetWindowAttributes wa;
1449
1450         /* init screen */
1451         screen = DefaultScreen(dpy);
1452         root = RootWindow(dpy, screen);
1453         initfont(font);
1454         sx = 0;
1455         sy = 0;
1456         sw = DisplayWidth(dpy, screen);
1457         sh = DisplayHeight(dpy, screen);
1458         bh = dc.h = dc.font.height + 2;
1459         lt[0] = &layouts[0];
1460         lt[1] = &layouts[1 % LENGTH(layouts)];
1461         updategeom();
1462
1463         /* init atoms */
1464         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1465         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1466         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1467         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1468         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1469
1470         /* init cursors */
1471         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1472         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1473         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1474
1475         /* init appearance */
1476         dc.norm[ColBorder] = getcolor(normbordercolor);
1477         dc.norm[ColBG] = getcolor(normbgcolor);
1478         dc.norm[ColFG] = getcolor(normfgcolor);
1479         dc.sel[ColBorder] = getcolor(selbordercolor);
1480         dc.sel[ColBG] = getcolor(selbgcolor);
1481         dc.sel[ColFG] = getcolor(selfgcolor);
1482         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1483         dc.gc = XCreateGC(dpy, root, 0, NULL);
1484         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1485         if(!dc.font.set)
1486                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1487
1488         /* init bars */
1489         for(blw = i = 0; LENGTH(layouts) > 1 && i < LENGTH(layouts); i++) {
1490                 w = TEXTW(layouts[i].symbol);
1491                 blw = MAX(blw, w);
1492         }
1493         updatebars();
1494         updatestatus();
1495
1496         /* EWMH support per view */
1497         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1498                         PropModeReplace, (unsigned char *) netatom, NetLast);
1499
1500         /* select for events */
1501         wa.cursor = cursor[CurNormal];
1502         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1503                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1504                         |PropertyChangeMask;
1505         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1506         XSelectInput(dpy, root, wa.event_mask);
1507
1508         grabkeys();
1509 }
1510
1511 void
1512 showhide(Client *c) {
1513         if(!c)
1514                 return;
1515         if(ISVISIBLE(c)) { /* show clients top down */
1516                 XMoveWindow(dpy, c->win, c->x, c->y);
1517                 if(!lt[c->mon->sellt]->arrange || c->isfloating)
1518                         resize(c, c->x, c->y, c->w, c->h);
1519                 showhide(c->snext);
1520         }
1521         else { /* hide clients bottom up */
1522                 showhide(c->snext);
1523                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1524         }
1525 }
1526
1527
1528 void
1529 sigchld(int signal) {
1530         while(0 < waitpid(-1, NULL, WNOHANG));
1531 }
1532
1533 void
1534 spawn(const Arg *arg) {
1535         signal(SIGCHLD, sigchld);
1536         if(fork() == 0) {
1537                 if(dpy)
1538                         close(ConnectionNumber(dpy));
1539                 setsid();
1540                 execvp(((char **)arg->v)[0], (char **)arg->v);
1541                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1542                 perror(" failed");
1543                 exit(0);
1544         }
1545 }
1546
1547 void
1548 tag(const Arg *arg) {
1549         if(selmon->sel && arg->ui & TAGMASK) {
1550                 selmon->sel->tags = arg->ui & TAGMASK;
1551                 arrange();
1552         }
1553 }
1554
1555 #ifdef XINERAMA
1556 void
1557 tagmon(const Arg *arg) {
1558         Monitor *m;
1559
1560         if(!selmon->sel || !(m = getmonn(arg->ui)))
1561                 return;
1562         sendmon(selmon->sel, m);
1563 }
1564 #endif /* XINERAMA */
1565
1566 int
1567 textnw(const char *text, unsigned int len) {
1568         XRectangle r;
1569
1570         if(dc.font.set) {
1571                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1572                 return r.width;
1573         }
1574         return XTextWidth(dc.font.xfont, text, len);
1575 }
1576
1577 void
1578 tile(Monitor *m) {
1579         int x, y, h, w, mw;
1580         unsigned int i, n;
1581         Client *c;
1582
1583         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1584         if(n == 0)
1585                 return;
1586
1587         /* master */
1588         c = nexttiled(m->clients);
1589         mw = m->mfact * m->ww;
1590         resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw);
1591
1592         if(--n == 0)
1593                 return;
1594
1595         /* tile stack */
1596         x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1597         y = m->wy;
1598         w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1599         h = m->wh / n;
1600         if(h < bh)
1601                 h = m->wh;
1602
1603         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1604                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1605                        ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw));
1606                 if(h != m->wh)
1607                         y = c->y + HEIGHT(c);
1608         }
1609 }
1610
1611 void
1612 togglebar(const Arg *arg) {
1613         selmon->showbar = !selmon->showbar;
1614         updatebarpos(selmon);
1615         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1616         arrange();
1617 }
1618
1619 void
1620 togglefloating(const Arg *arg) {
1621         if(!selmon->sel)
1622                 return;
1623         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1624         if(selmon->sel->isfloating)
1625                 resize(selmon->sel, selmon->sel->x, selmon->sel->y, selmon->sel->w, selmon->sel->h);
1626         arrange();
1627 }
1628
1629 void
1630 toggletag(const Arg *arg) {
1631         unsigned int mask;
1632
1633         if(!selmon->sel)
1634                 return;
1635
1636         mask = selmon->sel->tags ^ (arg->ui & TAGMASK);
1637         if(mask) {
1638                 selmon->sel->tags = mask;
1639                 arrange();
1640         }
1641 }
1642
1643 void
1644 toggleview(const Arg *arg) {
1645         unsigned int mask = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1646
1647         if(mask) {
1648                 selmon->tagset[selmon->seltags] = mask;
1649                 arrange();
1650         }
1651 }
1652
1653 void
1654 unfocus(Client *c) {
1655         if(!c)
1656                 return;
1657         grabbuttons(c, False);
1658         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1659         XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1660 }
1661
1662 void
1663 unmanage(Client *c) {
1664         XWindowChanges wc;
1665
1666         wc.border_width = c->oldbw;
1667         /* The server grab construct avoids race conditions. */
1668         XGrabServer(dpy);
1669         XSetErrorHandler(xerrordummy);
1670         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1671         detach(c);
1672         detachstack(c);
1673         if(c->mon->sel == c) {
1674                 /* TODO: consider separate the next code into a function or into detachstack? */
1675                 Client *tc;
1676                 for(tc = c->mon->stack; tc && !ISVISIBLE(tc); tc = tc->snext);
1677                 c->mon->sel = tc;
1678                 focus(NULL);
1679         }
1680         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1681         setclientstate(c, WithdrawnState);
1682         free(c);
1683         XSync(dpy, False);
1684         XSetErrorHandler(xerror);
1685         XUngrabServer(dpy);
1686         arrange();
1687 }
1688
1689 void
1690 unmapnotify(XEvent *e) {
1691         Client *c;
1692         XUnmapEvent *ev = &e->xunmap;
1693
1694         if((c = getclient(ev->window)))
1695                 unmanage(c);
1696 }
1697
1698 void
1699 updatebars(void) {
1700         Monitor *m;
1701         XSetWindowAttributes wa;
1702
1703         wa.override_redirect = True;
1704         wa.background_pixmap = ParentRelative;
1705         wa.event_mask = ButtonPressMask|ExposureMask;
1706
1707         for(m = mons; m; m = m->next) {
1708                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1709
1710                                           CopyFromParent, DefaultVisual(dpy, screen),
1711                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1712                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1713                 XMapRaised(dpy, m->barwin);
1714         }
1715 }
1716
1717 void
1718 updatebarpos(Monitor *m) {
1719         m->wy = m->my;
1720         m->wh = m->mh;
1721         if(m->showbar) {
1722                 m->wh -= bh;
1723                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1724                 m->wy = m->topbar ? m->wy + bh : m->wy;
1725         }
1726         else
1727                 m->by = -bh;
1728 }
1729
1730 void
1731 updategeom(void) {
1732         int i, n = 1;
1733         Client *c;
1734         Monitor *newmons = NULL, *m, *tm;
1735
1736 #ifdef XINULATOR
1737         n = 2;
1738 #elif defined(XINERAMA)
1739         XineramaScreenInfo *info = NULL;
1740
1741         if(XineramaIsActive(dpy))
1742                 info = XineramaQueryScreens(dpy, &n);
1743 #endif
1744         /* allocate monitor(s) for the new geometry setup */
1745         for(i = 0; i < n; i++) {
1746                 m = (Monitor *)malloc(sizeof(Monitor));
1747                 m->next = newmons;
1748                 newmons = m;
1749         }
1750
1751         /* initialise monitor(s) */
1752 #ifdef XINULATOR
1753         if(1) {
1754                 m = newmons;
1755                 m->screen_number = 0;
1756                 m->wx = sx;
1757                 m->my = m->wy = sy;
1758                 m->ww = sw;
1759                 m->mh = m->wh = sh / 2;
1760                 m = newmons->next;
1761                 m->screen_number = 1;
1762                 m->wx = sx;
1763                 m->my = m->wy = sy + sh / 2;
1764                 m->ww = sw;
1765                 m->mh = m->wh = sh / 2;
1766         }
1767         else
1768 #elif defined(XINERAMA)
1769         if(XineramaIsActive(dpy)) {
1770                 for(i = 0, m = newmons; m; m = m->next, i++) {
1771                         m->screen_number = info[i].screen_number;
1772                         m->mx = m->wx = info[i].x_org;
1773                         m->my = m->wy = info[i].y_org;
1774                         m->mw = m->ww = info[i].width;
1775                         m->mh = m->wh = info[i].height;
1776                 }
1777                 XFree(info);
1778         }
1779         else
1780 #endif
1781         /* default monitor setup */
1782         {
1783                 m->screen_number = 0;
1784                 m->wx = sx;
1785                 m->my = m->wy = sy;
1786                 m->ww = sw;
1787                 m->mh = m->wh = sh;
1788         }
1789
1790         /* bar geometry setup */
1791         for(m = newmons; m; m = m->next) {
1792                 /* TODO: consider removing the following values from config.h */
1793                 m->clients = NULL;
1794                 m->sel = NULL;
1795                 m->stack = NULL;
1796                 m->seltags = 0;
1797                 m->sellt = 0;
1798                 m->tagset[0] = m->tagset[1] = 1;
1799                 m->mfact = mfact;
1800                 m->showbar = showbar;
1801                 m->topbar = topbar;
1802                 updatebarpos(m);
1803         }
1804
1805         /* reassign left over clients of disappeared monitors */
1806         for(tm = mons; tm; tm = tm->next)
1807                 while(tm->clients) {
1808                         c = tm->clients;
1809                         tm->clients = c->next;
1810                         detachstack(c);
1811                         c->mon = newmons;
1812                         attach(c);
1813                         attachstack(c);
1814                 }
1815
1816         /* select focused monitor */
1817         cleanupmons();
1818         mons = newmons;
1819         selmon = getmon(root);
1820 }
1821
1822 void
1823 updatenumlockmask(void) {
1824         unsigned int i, j;
1825         XModifierKeymap *modmap;
1826
1827         numlockmask = 0;
1828         modmap = XGetModifierMapping(dpy);
1829         for(i = 0; i < 8; i++)
1830                 for(j = 0; j < modmap->max_keypermod; j++)
1831                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1832                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1833                                 numlockmask = (1 << i);
1834         XFreeModifiermap(modmap);
1835 }
1836
1837 void
1838 updatesizehints(Client *c) {
1839         long msize;
1840         XSizeHints size;
1841
1842         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1843                 /* size is uninitialized, ensure that size.flags aren't used */
1844                 size.flags = PSize;
1845         if(size.flags & PBaseSize) {
1846                 c->basew = size.base_width;
1847                 c->baseh = size.base_height;
1848         }
1849         else if(size.flags & PMinSize) {
1850                 c->basew = size.min_width;
1851                 c->baseh = size.min_height;
1852         }
1853         else
1854                 c->basew = c->baseh = 0;
1855         if(size.flags & PResizeInc) {
1856                 c->incw = size.width_inc;
1857                 c->inch = size.height_inc;
1858         }
1859         else
1860                 c->incw = c->inch = 0;
1861         if(size.flags & PMaxSize) {
1862                 c->maxw = size.max_width;
1863                 c->maxh = size.max_height;
1864         }
1865         else
1866                 c->maxw = c->maxh = 0;
1867         if(size.flags & PMinSize) {
1868                 c->minw = size.min_width;
1869                 c->minh = size.min_height;
1870         }
1871         else if(size.flags & PBaseSize) {
1872                 c->minw = size.base_width;
1873                 c->minh = size.base_height;
1874         }
1875         else
1876                 c->minw = c->minh = 0;
1877         if(size.flags & PAspect) {
1878                 c->mina = (float)size.min_aspect.y / (float)size.min_aspect.x;
1879                 c->maxa = (float)size.max_aspect.x / (float)size.max_aspect.y;
1880         }
1881         else
1882                 c->maxa = c->mina = 0.0;
1883         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1884                      && c->maxw == c->minw && c->maxh == c->minh);
1885 }
1886
1887 void
1888 updatetitle(Client *c) {
1889         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1890                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1891 }
1892
1893 void
1894 updatestatus(void) {
1895         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1896                 strcpy(stext, "dwm-"VERSION);
1897         drawbar(selmon);
1898 }
1899
1900 void
1901 updatewmhints(Client *c) {
1902         XWMHints *wmh;
1903
1904         if((wmh = XGetWMHints(dpy, c->win))) {
1905                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1906                         wmh->flags &= ~XUrgencyHint;
1907                         XSetWMHints(dpy, c->win, wmh);
1908                 }
1909                 else
1910                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1911
1912                 XFree(wmh);
1913         }
1914 }
1915
1916 void
1917 view(const Arg *arg) {
1918         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1919                 return;
1920         selmon->seltags ^= 1; /* toggle sel tagset */
1921         if(arg->ui & TAGMASK)
1922                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1923         arrange();
1924 }
1925
1926 /* There's no way to check accesses to destroyed windows, thus those cases are
1927  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1928  * default error handler, which may call exit.  */
1929 int
1930 xerror(Display *dpy, XErrorEvent *ee) {
1931         if(ee->error_code == BadWindow
1932         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1933         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1934         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1935         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1936         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1937         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1938         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1939         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1940                 return 0;
1941         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1942                         ee->request_code, ee->error_code);
1943         return xerrorxlib(dpy, ee); /* may call exit */
1944 }
1945
1946 int
1947 xerrordummy(Display *dpy, XErrorEvent *ee) {
1948         return 0;
1949 }
1950
1951 /* Startup Error handler to check if another window manager
1952  * is already running. */
1953 int
1954 xerrorstart(Display *dpy, XErrorEvent *ee) {
1955         otherwm = True;
1956         return -1;
1957 }
1958
1959 void
1960 zoom(const Arg *arg) {
1961         Client *c = selmon->sel;
1962
1963         if(!lt[selmon->sellt]->arrange || lt[selmon->sellt]->arrange == monocle || (selmon->sel && selmon->sel->isfloating))
1964                 return;
1965         if(c == nexttiled(selmon->clients))
1966                 if(!c || !(c = nexttiled(c->next)))
1967                         return;
1968         detach(c);
1969         attach(c);
1970         focus(c);
1971         arrange();
1972 }
1973
1974 int
1975 main(int argc, char *argv[]) {
1976         if(argc == 2 && !strcmp("-v", argv[1]))
1977                 die("dwm-"VERSION", © 2006-2009 dwm engineers, see LICENSE for details\n");
1978         else if(argc != 1)
1979                 die("usage: dwm [-v]\n");
1980
1981         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1982                 fputs("warning: no locale support\n", stderr);
1983
1984         if(!(dpy = XOpenDisplay(NULL)))
1985                 die("dwm: cannot open display\n");
1986
1987         checkotherwm();
1988         setup();
1989         scan();
1990         run();
1991         cleanup();
1992
1993         XCloseDisplay(dpy);
1994         return 0;
1995 }