dwm.c

   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 linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. 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 /* XINERAMA */
  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(C)            ((C->tags & C->mon->tagset[C->mon->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 MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  52 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  53 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  54 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  55 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  56
  57 /* enums */
  58 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  59 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  60 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  61 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
  62 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  63        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  64
  65 typedef union {
  66         int i;
  67         unsigned int ui;
  68         float f;
  69         const void *v;
  70 } Arg;
  71
  72 typedef struct {
  73         unsigned int click;
  74         unsigned int mask;
  75         unsigned int button;
  76         void (*func)(const Arg *arg);
  77         const Arg arg;
  78 } Button;
  79
  80 typedef struct Monitor Monitor;
  81 typedef struct Client Client;
  82 struct 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         Monitor *mon;
  93         Window win;
  94 };
  95
  96 typedef struct {
  97         int x, y, w, h;
  98         unsigned long norm[ColLast];
  99         unsigned long sel[ColLast];
 100         Drawable drawable;
 101         GC gc;
 102         struct {
 103                 int ascent;
 104                 int descent;
 105                 int height;
 106                 XFontSet set;
 107                 XFontStruct *xfont;
 108         } font;
 109 } DC; /* draw context */
 110
 111 typedef struct {
 112         unsigned int mod;
 113         KeySym keysym;
 114         void (*func)(const Arg *);
 115         const Arg arg;
 116 } Key;
 117
 118 typedef struct {
 119         const char *symbol;
 120         void (*arrange)(Monitor *);
 121 } Layout;
 122
 123 struct Monitor {
 124         float mfact;
 125         int num;
 126         int by;               /* bar geometry */
 127         int mx, my, mw, mh;   /* screen size */
 128         int wx, wy, ww, wh;   /* window area  */
 129         unsigned int seltags;
 130         unsigned int sellt;
 131         unsigned int tagset[2];
 132         Bool showbar;
 133         Bool topbar;
 134         Client *clients;
 135         Client *sel;
 136         Client *stack;
 137         Monitor *next;
 138         Window barwin;
 139         const Layout *lt[2];
 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         int monitor;
 149 } Rule;
 150
 151 /* function declarations */
 152 static void applyrules(Client *c);
 153 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 154 static void arrange(void);
 155 static void attach(Client *c);
 156 static void attachstack(Client *c);
 157 static void buttonpress(XEvent *e);
 158 static void checkotherwm(void);
 159 static void cleanup(void);
 160 static void cleanupmons(void);
 161 static void clearurgent(Client *c);
 162 static void configure(Client *c);
 163 static void configurenotify(XEvent *e);
 164 static void configurerequest(XEvent *e);
 165 static void destroynotify(XEvent *e);
 166 static void detach(Client *c);
 167 static void detachstack(Client *c);
 168 static void die(const char *errstr, ...);
 169 static Monitor *dirtomon(int dir);
 170 static void drawbar(Monitor *m);
 171 static void drawbars(void);
 172 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 173 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 174 static void enternotify(XEvent *e);
 175 static void expose(XEvent *e);
 176 static void focus(Client *c);
 177 static void focusin(XEvent *e);
 178 static void focusmon(const Arg *arg);
 179 static void focusstack(const Arg *arg);
 180 static unsigned long getcolor(const char *colstr);
 181 static Bool getrootptr(int *x, int *y);
 182 static long getstate(Window w);
 183 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 184 static void grabbuttons(Client *c, Bool focused);
 185 static void grabkeys(void);
 186 static void initfont(const char *fontstr);
 187 static Bool isprotodel(Client *c);
 188 static void keypress(XEvent *e);
 189 static void killclient(const Arg *arg);
 190 static void manage(Window w, XWindowAttributes *wa);
 191 static void mappingnotify(XEvent *e);
 192 static void maprequest(XEvent *e);
 193 static void monocle(Monitor *m);
 194 static void movemouse(const Arg *arg);
 195 static Client *nexttiled(Client *c);
 196 static Monitor *ptrtomon(int x, int y);
 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, Bool interact);
 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 void tagmon(const Arg *arg);
 214 static int textnw(const char *text, unsigned int len);
 215 static void tile(Monitor *);
 216 static void togglebar(const Arg *arg);
 217 static void togglefloating(const Arg *arg);
 218 static void toggletag(const Arg *arg);
 219 static void toggleview(const Arg *arg);
 220 static void unfocus(Client *c);
 221 static void unmanage(Client *c);
 222 static void unmapnotify(XEvent *e);
 223 static void updategeom(void);
 224 static void updatebarpos(Monitor *m);
 225 static void updatebars(void);
 226 static void updatenumlockmask(void);
 227 static void updatesizehints(Client *c);
 228 static void updatestatus(void);
 229 static void updatetitle(Client *c);
 230 static void updatewmhints(Client *c);
 231 static void view(const Arg *arg);
 232 static Client *wintoclient(Window w);
 233 static Monitor *wintomon(Window w);
 234 static int xerror(Display *dpy, XErrorEvent *ee);
 235 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 236 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 237 static void zoom(const Arg *arg);
 238
 239 /* variables */
 240 static const char broken[] = "broken";
 241 static char stext[256], ntext[8];
 242 static int screen;
 243 static int sw, sh;           /* X display screen geometry 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 Monitor *mons = NULL, *selmon = NULL;
 268 static Window root;
 269
 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[LENGTH(tags) > 31 ? -1 : 1]; };
 275
 276 /* function implementations */
 277 void
 278 applyrules(Client *c) {
 279         const char *class, *instance;
 280         unsigned int i;
 281         const Rule *r;
 282         Monitor *m;
 283         XClassHint ch = { 0 };
 284
 285         /* rule matching */
 286         c->isfloating = c->tags = 0;
 287         if(XGetClassHint(dpy, c->win, &ch)) {
 288                 class = ch.res_class ? ch.res_class : broken;
 289                 instance = ch.res_name ? ch.res_name : broken;
 290                 for(i = 0; i < LENGTH(rules); i++) {
 291                         r = &rules[i];
 292                         if((!r->title || strstr(c->name, r->title))
 293                         && (!r->class || strstr(class, r->class))
 294                         && (!r->instance || strstr(instance, r->instance)))
 295                         {
 296                                 c->isfloating = r->isfloating;
 297                                 c->tags |= r->tags;
 298                                 for(m = mons; m && m->num != r->monitor; m = m->next);
 299                                 if(m)
 300                                         c->mon = m;
 301                         }
 302                 }
 303                 if(ch.res_class)
 304                         XFree(ch.res_class);
 305                 if(ch.res_name)
 306                         XFree(ch.res_name);
 307         }
 308         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 309 }
 310
 311 Bool
 312 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 313         Bool baseismin;
 314         Monitor *m = c->mon;
 315
 316         /* set minimum possible */
 317         *w = MAX(1, *w);
 318         *h = MAX(1, *h);
 319         if(interact) {
 320                 if(*x > sw)
 321                         *x = sw - WIDTH(c);
 322                 if(*y > sh)
 323                         *y = sh - HEIGHT(c);
 324                 if(*x + *w + 2 * c->bw < 0)
 325                         *x = 0;
 326                 if(*y + *h + 2 * c->bw < 0)
 327                         *y = 0;
 328         }
 329         else {
 330                 if(*x > m->mx + m->mw)
 331                         *x = m->mx + m->mw - WIDTH(c);
 332                 if(*y > m->my + m->mh)
 333                         *y = m->my + m->mh - HEIGHT(c);
 334                 if(*x + *w + 2 * c->bw < m->mx)
 335                         *x = m->mx;
 336                 if(*y + *h + 2 * c->bw < m->my)
 337                         *y = m->my;
 338         }
 339         if(*h < bh)
 340                 *h = bh;
 341         if(*w < bh)
 342                 *w = bh;
 343         if(resizehints || c->isfloating) {
 344                 /* see last two sentences in ICCCM 4.1.2.3 */
 345                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 346                 if(!baseismin) { /* temporarily remove base dimensions */
 347                         *w -= c->basew;
 348                         *h -= c->baseh;
 349                 }
 350                 /* adjust for aspect limits */
 351                 if(c->mina > 0 && c->maxa > 0) {
 352                         if(c->maxa < (float)*w / *h)
 353                                 *w = *h * c->maxa;
 354                         else if(c->mina < (float)*h / *w)
 355                                 *h = *w * c->mina;
 356                 }
 357                 if(baseismin) { /* increment calculation requires this */
 358                         *w -= c->basew;
 359                         *h -= c->baseh;
 360                 }
 361                 /* adjust for increment value */
 362                 if(c->incw)
 363                         *w -= *w % c->incw;
 364                 if(c->inch)
 365                         *h -= *h % c->inch;
 366                 /* restore base dimensions */
 367                 *w += c->basew;
 368                 *h += c->baseh;
 369                 *w = MAX(*w, c->minw);
 370                 *h = MAX(*h, c->minh);
 371                 if(c->maxw)
 372                         *w = MIN(*w, c->maxw);
 373                 if(c->maxh)
 374                         *h = MIN(*h, c->maxh);
 375         }
 376         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 377 }
 378
 379 void
 380 arrange(void) {
 381         Monitor *m;
 382
 383         for(m = mons; m; m = m->next)
 384                 showhide(m->stack);
 385         focus(NULL);
 386         for(m = mons; m; m = m->next) {
 387                 if(m->lt[m->sellt]->arrange)
 388                         m->lt[m->sellt]->arrange(m);
 389                 restack(m);
 390         }
 391 }
 392
 393 void
 394 attach(Client *c) {
 395         c->next = c->mon->clients;
 396         c->mon->clients = c;
 397 }
 398
 399 void
 400 attachstack(Client *c) {
 401         c->snext = c->mon->stack;
 402         c->mon->stack = c;
 403 }
 404
 405 void
 406 buttonpress(XEvent *e) {
 407         unsigned int i, x, click;
 408         Arg arg = {0};
 409         Client *c;
 410         Monitor *m;
 411         XButtonPressedEvent *ev = &e->xbutton;
 412
 413         click = ClkRootWin;
 414         /* focus monitor if necessary */
 415         if((m = wintomon(ev->window)) && m != selmon) {
 416                 unfocus(selmon->sel);
 417                 selmon = m;
 418                 focus(NULL);
 419         }
 420         if(ev->window == selmon->barwin) {
 421                 i = x = 0;
 422                 do {
 423                         x += TEXTW(tags[i]);
 424                 } while(ev->x >= x && ++i < LENGTH(tags));
 425                 if(i < LENGTH(tags)) {
 426                         click = ClkTagBar;
 427                         arg.ui = 1 << i;
 428                 }
 429                 else if(ev->x < x + blw)
 430                         click = ClkLtSymbol;
 431                 else if(ev->x > selmon->wx + selmon->ww - TEXTW(stext))
 432                         click = ClkStatusText;
 433                 else
 434                         click = ClkWinTitle;
 435         }
 436         else if((c = wintoclient(ev->window))) {
 437                 focus(c);
 438                 click = ClkClientWin;
 439         }
 440         for(i = 0; i < LENGTH(buttons); i++)
 441                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 442                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 443                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 444 }
 445
 446 void
 447 checkotherwm(void) {
 448         otherwm = False;
 449         xerrorxlib = XSetErrorHandler(xerrorstart);
 450         /* this causes an error if some other window manager is running */
 451         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 452         XSync(dpy, False);
 453         if(otherwm)
 454                 die("dwm: another window manager is already running\n");
 455         XSetErrorHandler(xerror);
 456         XSync(dpy, False);
 457 }
 458
 459 void
 460 cleanup(void) {
 461         Arg a = {.ui = ~0};
 462         Layout foo = { "", NULL };
 463         Monitor *m;
 464
 465         view(&a);
 466         selmon->lt[selmon->sellt] = &foo;
 467         for(m = mons; m; m = m->next)
 468                 while(m->stack)
 469                         unmanage(m->stack);
 470         if(dc.font.set)
 471                 XFreeFontSet(dpy, dc.font.set);
 472         else
 473                 XFreeFont(dpy, dc.font.xfont);
 474         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 475         XFreePixmap(dpy, dc.drawable);
 476         XFreeGC(dpy, dc.gc);
 477         XFreeCursor(dpy, cursor[CurNormal]);
 478         XFreeCursor(dpy, cursor[CurResize]);
 479         XFreeCursor(dpy, cursor[CurMove]);
 480         cleanupmons();
 481         XSync(dpy, False);
 482         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 483 }
 484
 485 void
 486 cleanupmons(void) {
 487         Monitor *m;
 488
 489         while(mons) {
 490                 m = mons->next;
 491                 XUnmapWindow(dpy, mons->barwin);
 492                 XDestroyWindow(dpy, mons->barwin);
 493                 free(mons);
 494                 mons = m;
 495         }
 496 }
 497
 498 void
 499 clearurgent(Client *c) {
 500         XWMHints *wmh;
 501
 502         c->isurgent = False;
 503         if(!(wmh = XGetWMHints(dpy, c->win)))
 504                 return;
 505         wmh->flags &= ~XUrgencyHint;
 506         XSetWMHints(dpy, c->win, wmh);
 507         XFree(wmh);
 508 }
 509
 510 void
 511 configure(Client *c) {
 512         XConfigureEvent ce;
 513
 514         ce.type = ConfigureNotify;
 515         ce.display = dpy;
 516         ce.event = c->win;
 517         ce.window = c->win;
 518         ce.x = c->x;
 519         ce.y = c->y;
 520         ce.width = c->w;
 521         ce.height = c->h;
 522         ce.border_width = c->bw;
 523         ce.above = None;
 524         ce.override_redirect = False;
 525         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 526 }
 527
 528 void
 529 configurenotify(XEvent *e) {
 530         Monitor *m;
 531         XConfigureEvent *ev = &e->xconfigure;
 532
 533         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 534                 sw = ev->width;
 535                 sh = ev->height;
 536                 updategeom();
 537                 if(dc.drawable != 0)
 538                         XFreePixmap(dpy, dc.drawable);
 539                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 540                 updatebars();
 541                 for(m = mons; m; m = m->next)
 542                         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 543                 arrange();
 544         }
 545 }
 546
 547 void
 548 configurerequest(XEvent *e) {
 549         Client *c;
 550         Monitor *m;
 551         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 552         XWindowChanges wc;
 553
 554         if((c = wintoclient(ev->window))) {
 555                 if(ev->value_mask & CWBorderWidth)
 556                         c->bw = ev->border_width;
 557                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 558                         m = c->mon;
 559                         if(ev->value_mask & CWX)
 560                                 c->x = m->mx + ev->x;
 561                         if(ev->value_mask & CWY)
 562                                 c->y = m->my + ev->y;
 563                         if(ev->value_mask & CWWidth)
 564                                 c->w = ev->width;
 565                         if(ev->value_mask & CWHeight)
 566                                 c->h = ev->height;
 567                         if((c->x - m->mx + c->w) > m->mw && c->isfloating)
 568                                 c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 569                         if((c->y - m->my + c->h) > m->mh && c->isfloating)
 570                                 c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 571                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 572                                 configure(c);
 573                         if(ISVISIBLE(c))
 574                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 575                 }
 576                 else
 577                         configure(c);
 578         }
 579         else {
 580                 wc.x = ev->x;
 581                 wc.y = ev->y;
 582                 wc.width = ev->width;
 583                 wc.height = ev->height;
 584                 wc.border_width = ev->border_width;
 585                 wc.sibling = ev->above;
 586                 wc.stack_mode = ev->detail;
 587                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 588         }
 589         XSync(dpy, False);
 590 }
 591
 592 void
 593 destroynotify(XEvent *e) {
 594         Client *c;
 595         XDestroyWindowEvent *ev = &e->xdestroywindow;
 596
 597         if((c = wintoclient(ev->window)))
 598                 unmanage(c);
 599 }
 600
 601 void
 602 detach(Client *c) {
 603         Client **tc;
 604
 605         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 606         *tc = c->next;
 607 }
 608
 609 void
 610 detachstack(Client *c) {
 611         Client **tc, *t;
 612
 613         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 614         *tc = c->snext;
 615
 616         if(c == c->mon->sel) {
 617                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 618                 c->mon->sel = t;
 619         }
 620 }
 621
 622 void
 623 die(const char *errstr, ...) {
 624         va_list ap;
 625
 626         va_start(ap, errstr);
 627         vfprintf(stderr, errstr, ap);
 628         va_end(ap);
 629         exit(EXIT_FAILURE);
 630 }
 631
 632 Monitor *
 633 dirtomon(int dir) {
 634         Monitor *m = NULL;
 635
 636         if(dir > 0) {
 637                 if(!(m = selmon->next))
 638                         m = mons;
 639         }
 640         else {
 641                 if(selmon == mons)
 642                         for(m = mons; m->next; m = m->next);
 643                 else
 644                         for(m = mons; m->next != selmon; m = m->next);
 645         }
 646         return m;
 647 }
 648
 649 void
 650 drawbar(Monitor *m) {
 651         int x;
 652         unsigned int i, n = 0, occ = 0, urg = 0;
 653         unsigned long *col;
 654         Client *c;
 655
 656         for(c = m->clients; c; c = c->next) {
 657                 if(ISVISIBLE(c))
 658                         n++;
 659                 occ |= c->tags;
 660                 if(c->isurgent)
 661                         urg |= c->tags;
 662         }
 663         dc.x = 0;
 664         for(i = 0; i < LENGTH(tags); i++) {
 665                 dc.w = TEXTW(tags[i]);
 666                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 667                 drawtext(tags[i], col, urg & 1 << i);
 668                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 669                            occ & 1 << i, urg & 1 << i, col);
 670                 dc.x += dc.w;
 671         }
 672         if(blw > 0) {
 673                 dc.w = blw;
 674                 drawtext(m->lt[m->sellt]->symbol, dc.norm, False);
 675                 dc.x += dc.w;
 676         }
 677         snprintf(ntext, sizeof ntext, "%u", n);
 678         dc.w = TEXTW(ntext);
 679         drawtext(ntext, dc.norm, False);
 680         x = (dc.x += dc.w);
 681         if(m == selmon) { /* status is only drawn on selected monitor */
 682                 dc.w = TEXTW(stext);
 683                 dc.x = m->ww - dc.w;
 684                 if(dc.x < x) {
 685                         dc.x = x;
 686                         dc.w = m->ww - x;
 687                 }
 688                 drawtext(stext, dc.norm, False);
 689         }
 690         else
 691                 dc.x = m->ww;
 692         if((dc.w = dc.x - x) > bh) {
 693                 dc.x = x;
 694                 if(m->sel) {
 695                         col = m == selmon ? dc.sel : dc.norm;
 696                         drawtext(m->sel->name, col, False);
 697                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 698                 }
 699                 else
 700                         drawtext(NULL, dc.norm, False);
 701         }
 702         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 703         XSync(dpy, False);
 704 }
 705
 706 void
 707 drawbars(void) {
 708         Monitor *m;
 709
 710         for(m = mons; m; m = m->next)
 711                 drawbar(m);
 712 }
 713
 714 void
 715 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 716         int x;
 717         XGCValues gcv;
 718         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 719
 720         gcv.foreground = col[invert ? ColBG : ColFG];
 721         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 722         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 723         r.x = dc.x + 1;
 724         r.y = dc.y + 1;
 725         if(filled) {
 726                 r.width = r.height = x + 1;
 727                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 728         }
 729         else if(empty) {
 730                 r.width = r.height = x;
 731                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 732         }
 733 }
 734
 735 void
 736 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 737         char buf[256];
 738         int i, x, y, h, len, olen;
 739         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 740
 741         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 742         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 743         if(!text)
 744                 return;
 745         olen = strlen(text);
 746         h = dc.font.ascent + dc.font.descent;
 747         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 748         x = dc.x + (h / 2);
 749         /* shorten text if necessary */
 750         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 751         if(!len)
 752                 return;
 753         memcpy(buf, text, len);
 754         if(len < olen)
 755                 for(i = len; i && i > len - 3; buf[--i] = '.');
 756         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 757         if(dc.font.set)
 758                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 759         else
 760                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 761 }
 762
 763 void
 764 enternotify(XEvent *e) {
 765         Client *c;
 766         Monitor *m;
 767         XCrossingEvent *ev = &e->xcrossing;
 768
 769         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 770                 return;
 771         if((m = wintomon(ev->window)) && m != selmon) {
 772                 unfocus(selmon->sel);
 773                 selmon = m;
 774         }
 775         if((c = wintoclient(ev->window)))
 776                 focus(c);
 777         else
 778                 focus(NULL);
 779 }
 780
 781 void
 782 expose(XEvent *e) {
 783         Monitor *m;
 784         XExposeEvent *ev = &e->xexpose;
 785
 786         if(ev->count == 0 && (m = wintomon(ev->window)))
 787                 drawbar(m);
 788 }
 789
 790 void
 791 focus(Client *c) {
 792         if(!c || !ISVISIBLE(c))
 793                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 794         if(selmon->sel)
 795                 unfocus(selmon->sel);
 796         if(c) {
 797                 if(c->mon != selmon)
 798                         selmon = c->mon;
 799                 if(c->isurgent)
 800                         clearurgent(c);
 801                 detachstack(c);
 802                 attachstack(c);
 803                 grabbuttons(c, True);
 804                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 805                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 806         }
 807         else
 808                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 809         selmon->sel = c;
 810         drawbars();
 811 }
 812
 813 void
 814 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 815         XFocusChangeEvent *ev = &e->xfocus;
 816
 817         if(selmon->sel && ev->window != selmon->sel->win)
 818                 XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 819 }
 820
 821 void
 822 focusmon(const Arg *arg) {
 823         Monitor *m = NULL;
 824
 825         if(!mons->next)
 826                 return;
 827         m = dirtomon(arg->i);
 828         unfocus(selmon->sel);
 829         selmon = m;
 830         focus(NULL);
 831 }
 832
 833 void
 834 focusstack(const Arg *arg) {
 835         Client *c = NULL, *i;
 836
 837         if(!selmon->sel)
 838                 return;
 839         if(arg->i > 0) {
 840                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 841                 if(!c)
 842                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 843         }
 844         else {
 845                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 846                         if(ISVISIBLE(i))
 847                                 c = i;
 848                 if(!c)
 849                         for(; i; i = i->next)
 850                                 if(ISVISIBLE(i))
 851                                         c = i;
 852         }
 853         if(c) {
 854                 focus(c);
 855                 restack(selmon);
 856         }
 857 }
 858
 859 unsigned long
 860 getcolor(const char *colstr) {
 861         Colormap cmap = DefaultColormap(dpy, screen);
 862         XColor color;
 863
 864         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 865                 die("error, cannot allocate color '%s'\n", colstr);
 866         return color.pixel;
 867 }
 868
 869 Bool
 870 getrootptr(int *x, int *y) {
 871         int di;
 872         unsigned int dui;
 873         Window dummy;
 874
 875         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 876 }
 877
 878 long
 879 getstate(Window w) {
 880         int format, status;
 881         long result = -1;
 882         unsigned char *p = NULL;
 883         unsigned long n, extra;
 884         Atom real;
 885
 886         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 887                                     &real, &format, &n, &extra, (unsigned char **)&p);
 888         if(status != Success)
 889                 return -1;
 890         if(n != 0)
 891                 result = *p;
 892         XFree(p);
 893         return result;
 894 }
 895
 896 Bool
 897 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 898         char **list = NULL;
 899         int n;
 900         XTextProperty name;
 901
 902         if(!text || size == 0)
 903                 return False;
 904         text[0] = '\0';
 905         XGetTextProperty(dpy, w, &name, atom);
 906         if(!name.nitems)
 907                 return False;
 908         if(name.encoding == XA_STRING)
 909                 strncpy(text, (char *)name.value, size - 1);
 910         else {
 911                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 912                         strncpy(text, *list, size - 1);
 913                         XFreeStringList(list);
 914                 }
 915         }
 916         text[size - 1] = '\0';
 917         XFree(name.value);
 918         return True;
 919 }
 920
 921 void
 922 grabbuttons(Client *c, Bool focused) {
 923         updatenumlockmask();
 924         {
 925                 unsigned int i, j;
 926                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 927                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 928                 if(focused) {
 929                         for(i = 0; i < LENGTH(buttons); i++)
 930                                 if(buttons[i].click == ClkClientWin)
 931                                         for(j = 0; j < LENGTH(modifiers); j++)
 932                                                 XGrabButton(dpy, buttons[i].button,
 933                                                             buttons[i].mask | modifiers[j],
 934                                                             c->win, False, BUTTONMASK,
 935                                                             GrabModeAsync, GrabModeSync, None, None);
 936                 }
 937                 else
 938                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 939                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 940         }
 941 }
 942
 943 void
 944 grabkeys(void) {
 945         updatenumlockmask();
 946         {
 947                 unsigned int i, j;
 948                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 949                 KeyCode code;
 950
 951                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 952                 for(i = 0; i < LENGTH(keys); i++) {
 953                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 954                                 for(j = 0; j < LENGTH(modifiers); j++)
 955                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 956                                                  True, GrabModeAsync, GrabModeAsync);
 957                 }
 958         }
 959 }
 960
 961 void
 962 initfont(const char *fontstr) {
 963         char *def, **missing;
 964         int i, n;
 965
 966         missing = NULL;
 967         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 968         if(missing) {
 969                 while(n--)
 970                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 971                 XFreeStringList(missing);
 972         }
 973         if(dc.font.set) {
 974                 XFontSetExtents *font_extents;
 975                 XFontStruct **xfonts;
 976                 char **font_names;
 977
 978                 dc.font.ascent = dc.font.descent = 0;
 979                 font_extents = XExtentsOfFontSet(dc.font.set);
 980                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 981                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 982                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 983                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
 984                         xfonts++;
 985                 }
 986         }
 987         else {
 988                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 989                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 990                         die("error, cannot load font: '%s'\n", fontstr);
 991                 dc.font.ascent = dc.font.xfont->ascent;
 992                 dc.font.descent = dc.font.xfont->descent;
 993         }
 994         dc.font.height = dc.font.ascent + dc.font.descent;
 995 }
 996
 997 Bool
 998 isprotodel(Client *c) {
 999         int i, n;
1000         Atom *protocols;
1001         Bool ret = False;
1002
1003         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1004                 for(i = 0; !ret && i < n; i++)
1005                         if(protocols[i] == wmatom[WMDelete])
1006                                 ret = True;
1007                 XFree(protocols);
1008         }
1009         return ret;
1010 }
1011
1012 void
1013 keypress(XEvent *e) {
1014         unsigned int i;
1015         KeySym keysym;
1016         XKeyEvent *ev;
1017
1018         ev = &e->xkey;
1019         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1020         for(i = 0; i < LENGTH(keys); i++)
1021                 if(keysym == keys[i].keysym
1022                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1023                 && keys[i].func)
1024                         keys[i].func(&(keys[i].arg));
1025 }
1026
1027 void
1028 killclient(const Arg *arg) {
1029         XEvent ev;
1030
1031         if(!selmon->sel)
1032                 return;
1033         if(isprotodel(selmon->sel)) {
1034                 ev.type = ClientMessage;
1035                 ev.xclient.window = selmon->sel->win;
1036                 ev.xclient.message_type = wmatom[WMProtocols];
1037                 ev.xclient.format = 32;
1038                 ev.xclient.data.l[0] = wmatom[WMDelete];
1039                 ev.xclient.data.l[1] = CurrentTime;
1040                 XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1041         }
1042         else
1043                 XKillClient(dpy, selmon->sel->win);
1044 }
1045
1046 void
1047 manage(Window w, XWindowAttributes *wa) {
1048         static Client cz;
1049         Client *c, *t = NULL;
1050         Window trans = None;
1051         XWindowChanges wc;
1052
1053         if(!(c = malloc(sizeof(Client))))
1054                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1055         *c = cz;
1056         c->win = w;
1057         updatetitle(c);
1058         if(XGetTransientForHint(dpy, w, &trans))
1059                 t = wintoclient(trans);
1060         if(t) {
1061                 c->mon = t->mon;
1062                 c->tags = t->tags;
1063         }
1064         else {
1065                 c->mon = selmon;
1066                 applyrules(c);
1067         }
1068         /* geometry */
1069         c->x = wa->x + c->mon->wx;
1070         c->y = wa->y + c->mon->wy;
1071         c->w = wa->width;
1072         c->h = wa->height;
1073         c->oldbw = wa->border_width;
1074         if(c->w == c->mon->mw && c->h == c->mon->mh) {
1075                 c->x = c->mon->mx;
1076                 c->y = c->mon->my;
1077                 c->bw = 0;
1078         }
1079         else {
1080                 if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1081                         c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1082                 if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1083                         c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1084                 c->x = MAX(c->x, c->mon->mx);
1085                 /* only fix client y-offset, if the client center might cover the bar */
1086                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1087                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1088                 c->bw = borderpx;
1089         }
1090         wc.border_width = c->bw;
1091         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1092         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1093         configure(c); /* propagates border_width, if size doesn't change */
1094         updatesizehints(c);
1095         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1096         grabbuttons(c, False);
1097         if(!c->isfloating)
1098                 c->isfloating = trans != None || c->isfixed;
1099         if(c->isfloating)
1100                 XRaiseWindow(dpy, c->win);
1101         attach(c);
1102         attachstack(c);
1103         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1104         XMapWindow(dpy, c->win);
1105         setclientstate(c, NormalState);
1106         arrange();
1107 }
1108
1109 void
1110 mappingnotify(XEvent *e) {
1111         XMappingEvent *ev = &e->xmapping;
1112
1113         XRefreshKeyboardMapping(ev);
1114         if(ev->request == MappingKeyboard)
1115                 grabkeys();
1116 }
1117
1118 void
1119 maprequest(XEvent *e) {
1120         static XWindowAttributes wa;
1121         XMapRequestEvent *ev = &e->xmaprequest;
1122
1123         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1124                 return;
1125         if(wa.override_redirect)
1126                 return;
1127         if(!wintoclient(ev->window))
1128                 manage(ev->window, &wa);
1129 }
1130
1131 void
1132 monocle(Monitor *m) {
1133         Client *c;
1134
1135         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1136                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1137 }
1138
1139 void
1140 movemouse(const Arg *arg) {
1141         int x, y, ocx, ocy, nx, ny;
1142         Client *c;
1143         Monitor *m;
1144         XEvent ev;
1145
1146         if(!(c = selmon->sel))
1147                 return;
1148         restack(selmon);
1149         ocx = c->x;
1150         ocy = c->y;
1151         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1152         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1153                 return;
1154         if(!getrootptr(&x, &y))
1155                 return;
1156         do {
1157                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1158                 switch (ev.type) {
1159                 case ConfigureRequest:
1160                 case Expose:
1161                 case MapRequest:
1162                         handler[ev.type](&ev);
1163                         break;
1164                 case MotionNotify:
1165                         nx = ocx + (ev.xmotion.x - x);
1166                         ny = ocy + (ev.xmotion.y - y);
1167                         if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1168                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1169                                 if(abs(selmon->wx - nx) < snap)
1170                                         nx = selmon->wx;
1171                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1172                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1173                                 if(abs(selmon->wy - ny) < snap)
1174                                         ny = selmon->wy;
1175                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1176                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1177                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1178                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1179                                         togglefloating(NULL);
1180                         }
1181                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1182                                 resize(c, nx, ny, c->w, c->h, True);
1183                         break;
1184                 }
1185         } while(ev.type != ButtonRelease);
1186         XUngrabPointer(dpy, CurrentTime);
1187         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1188                 sendmon(c, m);
1189                 selmon = m;
1190                 focus(NULL);
1191         }
1192 }
1193
1194 Client *
1195 nexttiled(Client *c) {
1196         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1197         return c;
1198 }
1199
1200 Monitor *
1201 ptrtomon(int x, int y) {
1202         Monitor *m;
1203
1204         for(m = mons; m; m = m->next)
1205                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1206                         return m;
1207         return selmon;
1208 }
1209
1210 void
1211 propertynotify(XEvent *e) {
1212         Client *c;
1213         Window trans;
1214         XPropertyEvent *ev = &e->xproperty;
1215
1216         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1217                 updatestatus();
1218         else if(ev->state == PropertyDelete)
1219                 return; /* ignore */
1220         else if((c = wintoclient(ev->window))) {
1221                 switch (ev->atom) {
1222                 default: break;
1223                 case XA_WM_TRANSIENT_FOR:
1224                         XGetTransientForHint(dpy, c->win, &trans);
1225                         if(!c->isfloating && (c->isfloating = (wintoclient(trans) != NULL)))
1226                                 arrange();
1227                         break;
1228                 case XA_WM_NORMAL_HINTS:
1229                         updatesizehints(c);
1230                         break;
1231                 case XA_WM_HINTS:
1232                         updatewmhints(c);
1233                         drawbars();
1234                         break;
1235                 }
1236                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1237                         updatetitle(c);
1238                         if(c == selmon->sel)
1239                                 drawbars();
1240                 }
1241         }
1242 }
1243
1244 void
1245 quit(const Arg *arg) {
1246         running = False;
1247 }
1248
1249 void
1250 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1251         XWindowChanges wc;
1252
1253         if(applysizehints(c, &x, &y, &w, &h, interact)) {
1254                 c->x = wc.x = x;
1255                 c->y = wc.y = y;
1256                 c->w = wc.width = w;
1257                 c->h = wc.height = h;
1258                 wc.border_width = c->bw;
1259                 XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1260                 configure(c);
1261                 XSync(dpy, False);
1262         }
1263 }
1264
1265 void
1266 resizemouse(const Arg *arg) {
1267         int ocx, ocy;
1268         int nw, nh;
1269         Client *c;
1270         Monitor *m;
1271         XEvent ev;
1272
1273         if(!(c = selmon->sel))
1274                 return;
1275         restack(selmon);
1276         ocx = c->x;
1277         ocy = c->y;
1278         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1279                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1280                 return;
1281         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1282         do {
1283                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1284                 switch(ev.type) {
1285                 case ConfigureRequest:
1286                 case Expose:
1287                 case MapRequest:
1288                         handler[ev.type](&ev);
1289                         break;
1290                 case MotionNotify:
1291                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1292                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1293                         if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1294                         && nh >= selmon->wy && nh <= selmon->wy + selmon->wh)
1295                         {
1296                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1297                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1298                                         togglefloating(NULL);
1299                         }
1300                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1301                                 resize(c, c->x, c->y, nw, nh, True);
1302                         break;
1303                 }
1304         } while(ev.type != ButtonRelease);
1305         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1306         XUngrabPointer(dpy, CurrentTime);
1307         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1308         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1309                 sendmon(c, m);
1310                 selmon = m;
1311                 focus(NULL);
1312         }
1313 }
1314
1315 void
1316 restack(Monitor *m) {
1317         Client *c;
1318         XEvent ev;
1319         XWindowChanges wc;
1320
1321         drawbars();
1322         if(!m->sel)
1323                 return;
1324         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1325                 XRaiseWindow(dpy, m->sel->win);
1326         if(m->lt[m->sellt]->arrange) {
1327                 wc.stack_mode = Below;
1328                 wc.sibling = m->barwin;
1329                 for(c = m->stack; c; c = c->snext)
1330                         if(!c->isfloating && ISVISIBLE(c)) {
1331                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1332                                 wc.sibling = c->win;
1333                         }
1334         }
1335         XSync(dpy, False);
1336         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1337 }
1338
1339 void
1340 run(void) {
1341         XEvent ev;
1342
1343         /* main event loop */
1344         XSync(dpy, False);
1345         while(running && !XNextEvent(dpy, &ev))
1346                 if(handler[ev.type])
1347                         handler[ev.type](&ev); /* call handler */
1348 }
1349
1350 void
1351 scan(void) {
1352         unsigned int i, num;
1353         Window d1, d2, *wins = NULL;
1354         XWindowAttributes wa;
1355
1356         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1357                 for(i = 0; i < num; i++) {
1358                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1359                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1360                                 continue;
1361                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1362                                 manage(wins[i], &wa);
1363                 }
1364                 for(i = 0; i < num; i++) { /* now the transients */
1365                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1366                                 continue;
1367                         if(XGetTransientForHint(dpy, wins[i], &d1)
1368                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1369                                 manage(wins[i], &wa);
1370                 }
1371                 if(wins)
1372                         XFree(wins);
1373         }
1374 }
1375
1376 void
1377 sendmon(Client *c, Monitor *m) {
1378         if(c->mon == m)
1379                 return;
1380         unfocus(c);
1381         detach(c);
1382         detachstack(c);
1383         c->mon = m;
1384         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1385         attach(c);
1386         attachstack(c);
1387         focus(NULL);
1388         arrange();
1389 }
1390
1391 void
1392 setclientstate(Client *c, long state) {
1393         long data[] = { state, None };
1394
1395         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1396                         PropModeReplace, (unsigned char *)data, 2);
1397 }
1398
1399 void
1400 setlayout(const Arg *arg) {
1401         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1402                 selmon->sellt ^= 1;
1403         if(arg && arg->v)
1404                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1405         if(selmon->sel)
1406                 arrange();
1407         else
1408                 drawbars();
1409 }
1410
1411 /* arg > 1.0 will set mfact absolutly */
1412 void
1413 setmfact(const Arg *arg) {
1414         float f;
1415
1416         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1417                 return;
1418         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1419         if(f < 0.1 || f > 0.9)
1420                 return;
1421         selmon->mfact = f;
1422         arrange();
1423 }
1424
1425 void
1426 setup(void) {
1427         unsigned int i;
1428         int w;
1429         XSetWindowAttributes wa;
1430
1431         /* init screen */
1432         screen = DefaultScreen(dpy);
1433         root = RootWindow(dpy, screen);
1434         initfont(font);
1435         sw = DisplayWidth(dpy, screen);
1436         sh = DisplayHeight(dpy, screen);
1437         bh = dc.h = dc.font.height + 2;
1438         updategeom();
1439         /* init atoms */
1440         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1441         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1442         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1443         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1444         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1445         /* init cursors */
1446         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1447         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1448         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1449         /* init appearance */
1450         dc.norm[ColBorder] = getcolor(normbordercolor);
1451         dc.norm[ColBG] = getcolor(normbgcolor);
1452         dc.norm[ColFG] = getcolor(normfgcolor);
1453         dc.sel[ColBorder] = getcolor(selbordercolor);
1454         dc.sel[ColBG] = getcolor(selbgcolor);
1455         dc.sel[ColFG] = getcolor(selfgcolor);
1456         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1457         dc.gc = XCreateGC(dpy, root, 0, NULL);
1458         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1459         if(!dc.font.set)
1460                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1461         /* init bars */
1462         for(blw = i = 0; LENGTH(layouts) > 1 && i < LENGTH(layouts); i++) {
1463                 w = TEXTW(layouts[i].symbol);
1464                 blw = MAX(blw, w);
1465         }
1466         updatebars();
1467         updatestatus();
1468         /* EWMH support per view */
1469         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1470                         PropModeReplace, (unsigned char *) netatom, NetLast);
1471         /* select for events */
1472         wa.cursor = cursor[CurNormal];
1473         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1474                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1475                         |PropertyChangeMask;
1476         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1477         XSelectInput(dpy, root, wa.event_mask);
1478         grabkeys();
1479 }
1480
1481 void
1482 showhide(Client *c) {
1483         if(!c)
1484                 return;
1485         if(ISVISIBLE(c)) { /* show clients top down */
1486                 XMoveWindow(dpy, c->win, c->x, c->y);
1487                 if(!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
1488                         resize(c, c->x, c->y, c->w, c->h, False);
1489                 showhide(c->snext);
1490         }
1491         else { /* hide clients bottom up */
1492                 showhide(c->snext);
1493                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1494         }
1495 }
1496
1497
1498 void
1499 sigchld(int signal) {
1500         while(0 < waitpid(-1, NULL, WNOHANG));
1501 }
1502
1503 void
1504 spawn(const Arg *arg) {
1505         signal(SIGCHLD, sigchld);
1506         if(fork() == 0) {
1507                 if(dpy)
1508                         close(ConnectionNumber(dpy));
1509                 setsid();
1510                 execvp(((char **)arg->v)[0], (char **)arg->v);
1511                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1512                 perror(" failed");
1513                 exit(0);
1514         }
1515 }
1516
1517 void
1518 tag(const Arg *arg) {
1519         if(selmon->sel && arg->ui & TAGMASK) {
1520                 selmon->sel->tags = arg->ui & TAGMASK;
1521                 arrange();
1522         }
1523 }
1524
1525 void
1526 tagmon(const Arg *arg) {
1527         if(!selmon->sel || !mons->next)
1528                 return;
1529         sendmon(selmon->sel, dirtomon(arg->i));
1530 }
1531
1532 int
1533 textnw(const char *text, unsigned int len) {
1534         XRectangle r;
1535
1536         if(dc.font.set) {
1537                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1538                 return r.width;
1539         }
1540         return XTextWidth(dc.font.xfont, text, len);
1541 }
1542
1543 void
1544 tile(Monitor *m) {
1545         int x, y, h, w, mw;
1546         unsigned int i, n;
1547         Client *c;
1548
1549         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1550         if(n == 0)
1551                 return;
1552         /* master */
1553         c = nexttiled(m->clients);
1554         mw = m->mfact * m->ww;
1555         resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1556         if(--n == 0)
1557                 return;
1558         /* tile stack */
1559         x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1560         y = m->wy;
1561         w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1562         h = m->wh / n;
1563         if(h < bh)
1564                 h = m->wh;
1565         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1566                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1567                        ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1568                 if(h != m->wh)
1569                         y = c->y + HEIGHT(c);
1570         }
1571 }
1572
1573 void
1574 togglebar(const Arg *arg) {
1575         selmon->showbar = !selmon->showbar;
1576         updatebarpos(selmon);
1577         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1578         arrange();
1579 }
1580
1581 void
1582 togglefloating(const Arg *arg) {
1583         if(!selmon->sel)
1584                 return;
1585         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1586         if(selmon->sel->isfloating)
1587                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1588                        selmon->sel->w, selmon->sel->h, False);
1589         arrange();
1590 }
1591
1592 void
1593 toggletag(const Arg *arg) {
1594         unsigned int mask;
1595
1596         if(!selmon->sel)
1597                 return;
1598         mask = selmon->sel->tags ^ (arg->ui & TAGMASK);
1599         if(mask) {
1600                 selmon->sel->tags = mask;
1601                 arrange();
1602         }
1603 }
1604
1605 void
1606 toggleview(const Arg *arg) {
1607         unsigned int mask = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1608
1609         if(mask) {
1610                 selmon->tagset[selmon->seltags] = mask;
1611                 arrange();
1612         }
1613 }
1614
1615 void
1616 unfocus(Client *c) {
1617         if(!c)
1618                 return;
1619         grabbuttons(c, False);
1620         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1621         XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1622 }
1623
1624 void
1625 unmanage(Client *c) {
1626         XWindowChanges wc;
1627
1628         wc.border_width = c->oldbw;
1629         /* The server grab construct avoids race conditions. */
1630         XGrabServer(dpy);
1631         XSetErrorHandler(xerrordummy);
1632         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1633         detach(c);
1634         detachstack(c);
1635         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1636         setclientstate(c, WithdrawnState);
1637         free(c);
1638         XSync(dpy, False);
1639         XSetErrorHandler(xerror);
1640         XUngrabServer(dpy);
1641         focus(NULL);
1642         arrange();
1643 }
1644
1645 void
1646 unmapnotify(XEvent *e) {
1647         Client *c;
1648         XUnmapEvent *ev = &e->xunmap;
1649
1650         if((c = wintoclient(ev->window)))
1651                 unmanage(c);
1652 }
1653
1654 void
1655 updatebars(void) {
1656         Monitor *m;
1657         XSetWindowAttributes wa;
1658
1659         wa.override_redirect = True;
1660         wa.background_pixmap = ParentRelative;
1661         wa.event_mask = ButtonPressMask|ExposureMask;
1662         for(m = mons; m; m = m->next) {
1663                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1664                                           CopyFromParent, DefaultVisual(dpy, screen),
1665                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1666                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1667                 XMapRaised(dpy, m->barwin);
1668         }
1669 }
1670
1671 void
1672 updatebarpos(Monitor *m) {
1673         m->wy = m->my;
1674         m->wh = m->mh;
1675         if(m->showbar) {
1676                 m->wh -= bh;
1677                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1678                 m->wy = m->topbar ? m->wy + bh : m->wy;
1679         }
1680         else
1681                 m->by = -bh;
1682 }
1683
1684 void
1685 updategeom(void) {
1686         int i, n = 1;
1687         Client *c;
1688         Monitor *newmons = NULL, *m = NULL, *tm;
1689
1690 #ifdef XINERAMA
1691         XineramaScreenInfo *info = NULL;
1692
1693         if(XineramaIsActive(dpy))
1694                 info = XineramaQueryScreens(dpy, &n);
1695 #endif /* XINERAMA */
1696         /* allocate monitor(s) for the new geometry setup */
1697         for(i = 0; i < n; i++) {
1698                 if(!(m = (Monitor *)malloc(sizeof(Monitor))))
1699                         die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
1700                 m->next = newmons;
1701                 newmons = m;
1702         }
1703         /* initialise monitor(s) */
1704 #ifdef XINERAMA
1705         if(XineramaIsActive(dpy)) {
1706                 for(i = 0, m = newmons; m; m = m->next, i++) {
1707                         m->num = info[i].screen_number;
1708                         m->mx = m->wx = info[i].x_org;
1709                         m->my = m->wy = info[i].y_org;
1710                         m->mw = m->ww = info[i].width;
1711                         m->mh = m->wh = info[i].height;
1712                 }
1713                 XFree(info);
1714         }
1715         else
1716 #endif /* XINERAMA */
1717         /* default monitor setup */
1718         {
1719                 m->num = 0;
1720                 m->mx = m->wx = 0;
1721                 m->my = m->wy = 0;
1722                 m->mw = m->ww = sw;
1723                 m->mh = m->wh = sh;
1724         }
1725         /* bar geometry setup */
1726         for(m = newmons; m; m = m->next) {
1727                 m->sel = m->stack = m->clients = NULL;
1728                 m->seltags = 0;
1729                 m->sellt = 0;
1730                 m->tagset[0] = m->tagset[1] = 1;
1731                 m->mfact = mfact;
1732                 m->showbar = showbar;
1733                 m->topbar = topbar;
1734                 m->lt[0] = &layouts[0];
1735                 m->lt[1] = &layouts[1 % LENGTH(layouts)];
1736                 updatebarpos(m);
1737         }
1738         /* reassign left over clients of disappeared monitors */
1739         for(tm = mons; tm; tm = tm->next)
1740                 while(tm->clients) {
1741                         c = tm->clients;
1742                         tm->clients = c->next;
1743                         detachstack(c);
1744                         c->mon = newmons;
1745                         attach(c);
1746                         attachstack(c);
1747                 }
1748         /* select focused monitor */
1749         cleanupmons();
1750         selmon = mons = newmons;
1751         selmon = wintomon(root);
1752 }
1753
1754 void
1755 updatenumlockmask(void) {
1756         unsigned int i, j;
1757         XModifierKeymap *modmap;
1758
1759         numlockmask = 0;
1760         modmap = XGetModifierMapping(dpy);
1761         for(i = 0; i < 8; i++)
1762                 for(j = 0; j < modmap->max_keypermod; j++)
1763                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1764                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1765                                 numlockmask = (1 << i);
1766         XFreeModifiermap(modmap);
1767 }
1768
1769 void
1770 updatesizehints(Client *c) {
1771         long msize;
1772         XSizeHints size;
1773
1774         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1775                 /* size is uninitialized, ensure that size.flags aren't used */
1776                 size.flags = PSize;
1777         if(size.flags & PBaseSize) {
1778                 c->basew = size.base_width;
1779                 c->baseh = size.base_height;
1780         }
1781         else if(size.flags & PMinSize) {
1782                 c->basew = size.min_width;
1783                 c->baseh = size.min_height;
1784         }
1785         else
1786                 c->basew = c->baseh = 0;
1787         if(size.flags & PResizeInc) {
1788                 c->incw = size.width_inc;
1789                 c->inch = size.height_inc;
1790         }
1791         else
1792                 c->incw = c->inch = 0;
1793         if(size.flags & PMaxSize) {
1794                 c->maxw = size.max_width;
1795                 c->maxh = size.max_height;
1796         }
1797         else
1798                 c->maxw = c->maxh = 0;
1799         if(size.flags & PMinSize) {
1800                 c->minw = size.min_width;
1801                 c->minh = size.min_height;
1802         }
1803         else if(size.flags & PBaseSize) {
1804                 c->minw = size.base_width;
1805                 c->minh = size.base_height;
1806         }
1807         else
1808                 c->minw = c->minh = 0;
1809         if(size.flags & PAspect) {
1810                 c->mina = (float)size.min_aspect.y / (float)size.min_aspect.x;
1811                 c->maxa = (float)size.max_aspect.x / (float)size.max_aspect.y;
1812         }
1813         else
1814                 c->maxa = c->mina = 0.0;
1815         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1816                      && c->maxw == c->minw && c->maxh == c->minh);
1817 }
1818
1819 void
1820 updatetitle(Client *c) {
1821         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1822                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1823         if(c->name[0] == '\0') /* hack to mark broken clients */
1824                 strcpy(c->name, broken);
1825 }
1826
1827 void
1828 updatestatus(void) {
1829         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1830                 strcpy(stext, "dwm-"VERSION);
1831         drawbar(selmon);
1832 }
1833
1834 void
1835 updatewmhints(Client *c) {
1836         XWMHints *wmh;
1837
1838         if((wmh = XGetWMHints(dpy, c->win))) {
1839                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1840                         wmh->flags &= ~XUrgencyHint;
1841                         XSetWMHints(dpy, c->win, wmh);
1842                 }
1843                 else
1844                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1845                 XFree(wmh);
1846         }
1847 }
1848
1849 void
1850 view(const Arg *arg) {
1851         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1852                 return;
1853         selmon->seltags ^= 1; /* toggle sel tagset */
1854         if(arg->ui & TAGMASK)
1855                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1856         arrange();
1857 }
1858
1859 Client *
1860 wintoclient(Window w) {
1861         Client *c;
1862         Monitor *m;
1863
1864         for(m = mons; m; m = m->next)
1865                 for(c = m->clients; c; c = c->next)
1866                         if(c->win == w)
1867                                 return c;
1868         return NULL;
1869 }
1870
1871 Monitor *
1872 wintomon(Window w) {
1873         int x, y;
1874         Client *c;
1875         Monitor *m;
1876
1877         if(w == root && getrootptr(&x, &y))
1878                 return ptrtomon(x, y);
1879         for(m = mons; m; m = m->next)
1880                 if(w == m->barwin)
1881                         return m;
1882         if((c = wintoclient(w)))
1883                 return c->mon;
1884         return selmon;
1885 }
1886
1887 /* There's no way to check accesses to destroyed windows, thus those cases are
1888  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1889  * default error handler, which may call exit.  */
1890 int
1891 xerror(Display *dpy, XErrorEvent *ee) {
1892         if(ee->error_code == BadWindow
1893         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1894         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1895         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1896         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1897         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1898         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1899         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1900         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1901                 return 0;
1902         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1903                         ee->request_code, ee->error_code);
1904         return xerrorxlib(dpy, ee); /* may call exit */
1905 }
1906
1907 int
1908 xerrordummy(Display *dpy, XErrorEvent *ee) {
1909         return 0;
1910 }
1911
1912 /* Startup Error handler to check if another window manager
1913  * is already running. */
1914 int
1915 xerrorstart(Display *dpy, XErrorEvent *ee) {
1916         otherwm = True;
1917         return -1;
1918 }
1919
1920 void
1921 zoom(const Arg *arg) {
1922         Client *c = selmon->sel;
1923
1924         if(!selmon->lt[selmon->sellt]->arrange
1925         || selmon->lt[selmon->sellt]->arrange == monocle
1926         || (selmon->sel && selmon->sel->isfloating))
1927                 return;
1928         if(c == nexttiled(selmon->clients))
1929                 if(!c || !(c = nexttiled(c->next)))
1930                         return;
1931         detach(c);
1932         attach(c);
1933         focus(c);
1934         arrange();
1935 }
1936
1937 int
1938 main(int argc, char *argv[]) {
1939         if(argc == 2 && !strcmp("-v", argv[1]))
1940                 die("dwm-"VERSION", © 2006-2009 dwm engineers, see LICENSE for details\n");
1941         else if(argc != 1)
1942                 die("usage: dwm [-v]\n");
1943         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1944                 fputs("warning: no locale support\n", stderr);
1945         if(!(dpy = XOpenDisplay(NULL)))
1946                 die("dwm: cannot open display\n");
1947         checkotherwm();
1948         setup();
1949         scan();
1950         run();
1951         cleanup();
1952         XCloseDisplay(dpy);
1953         return 0;
1954 }