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