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         const char *ltsymbol;
 125         float mfact;
 126         int num;
 127         int by;               /* bar geometry */
 128         int mx, my, mw, mh;   /* screen size */
 129         int wx, wy, ww, wh;   /* window area  */
 130         unsigned int seltags;
 131         unsigned int sellt;
 132         unsigned int tagset[2];
 133         Bool showbar;
 134         Bool topbar;
 135         Client *clients;
 136         Client *sel;
 137         Client *stack;
 138         Monitor *next;
 139         Window barwin;
 140         const Layout *lt[2];
 141 };
 142
 143 typedef struct {
 144         const char *class;
 145         const char *instance;
 146         const char *title;
 147         unsigned int tags;
 148         Bool isfloating;
 149         int monitor;
 150 } Rule;
 151
 152 /* function declarations */
 153 static void applyrules(Client *c);
 154 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 155 static void arrange(void);
 156 static void attach(Client *c);
 157 static void attachstack(Client *c);
 158 static void buttonpress(XEvent *e);
 159 static void checkotherwm(void);
 160 static void cleanup(void);
 161 static void cleanupmons(void);
 162 static void clearurgent(Client *c);
 163 static void configure(Client *c);
 164 static void configurenotify(XEvent *e);
 165 static void configurerequest(XEvent *e);
 166 static void destroynotify(XEvent *e);
 167 static void detach(Client *c);
 168 static void detachstack(Client *c);
 169 static void die(const char *errstr, ...);
 170 static Monitor *dirtomon(int dir);
 171 static void drawbar(Monitor *m);
 172 static void drawbars(void);
 173 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 174 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 175 static void enternotify(XEvent *e);
 176 static void expose(XEvent *e);
 177 static void focus(Client *c);
 178 static void focusin(XEvent *e);
 179 static void focusmon(const Arg *arg);
 180 static void focusstack(const Arg *arg);
 181 static unsigned long getcolor(const char *colstr);
 182 static Bool getrootptr(int *x, int *y);
 183 static long getstate(Window w);
 184 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 185 static void grabbuttons(Client *c, Bool focused);
 186 static void grabkeys(void);
 187 static void initfont(const char *fontstr);
 188 static Bool isprotodel(Client *c);
 189 static void keypress(XEvent *e);
 190 static void killclient(const Arg *arg);
 191 static void manage(Window w, XWindowAttributes *wa);
 192 static void mappingnotify(XEvent *e);
 193 static void maprequest(XEvent *e);
 194 static void monocle(Monitor *m);
 195 static void movemouse(const Arg *arg);
 196 static Client *nexttiled(Client *c);
 197 static Monitor *ptrtomon(int x, int y);
 198 static void propertynotify(XEvent *e);
 199 static void quit(const Arg *arg);
 200 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 201 static void resizemouse(const Arg *arg);
 202 static void restack(Monitor *m);
 203 static void run(void);
 204 static void scan(void);
 205 static void sendmon(Client *c, Monitor *m);
 206 static void setclientstate(Client *c, long state);
 207 static void setlayout(const Arg *arg);
 208 static void setmfact(const Arg *arg);
 209 static void setup(void);
 210 static void showhide(Client *c);
 211 static void sigchld(int unused);
 212 static void spawn(const Arg *arg);
 213 static void tag(const Arg *arg);
 214 static void tagmon(const Arg *arg);
 215 static int textnw(const char *text, unsigned int len);
 216 static void tile(Monitor *);
 217 static void togglebar(const Arg *arg);
 218 static void togglefloating(const Arg *arg);
 219 static void toggletag(const Arg *arg);
 220 static void toggleview(const Arg *arg);
 221 static void unfocus(Client *c);
 222 static void unmanage(Client *c, Bool destroyed);
 223 static void unmapnotify(XEvent *e);
 224 static void updategeom(void);
 225 static void updatebarpos(Monitor *m);
 226 static void updatebars(void);
 227 static void updatenumlockmask(void);
 228 static void updatesizehints(Client *c);
 229 static void updatestatus(void);
 230 static void updatetitle(Client *c);
 231 static void updatewmhints(Client *c);
 232 static void view(const Arg *arg);
 233 static Client *wintoclient(Window w);
 234 static Monitor *wintomon(Window w);
 235 static int xerror(Display *dpy, XErrorEvent *ee);
 236 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 237 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 238 static void zoom(const Arg *arg);
 239
 240 /* variables */
 241 static const char broken[] = "broken";
 242 static char stext[256];
 243 static int screen;
 244 static int sw, sh;           /* X display screen geometry width, height */
 245 static int bh, blw = 0;      /* bar geometry */
 246 static int (*xerrorxlib)(Display *, XErrorEvent *);
 247 static unsigned int numlockmask = 0;
 248 static void (*handler[LASTEvent]) (XEvent *) = {
 249         [ButtonPress] = buttonpress,
 250         [ConfigureRequest] = configurerequest,
 251         [ConfigureNotify] = configurenotify,
 252         [DestroyNotify] = destroynotify,
 253         [EnterNotify] = enternotify,
 254         [Expose] = expose,
 255         [FocusIn] = focusin,
 256         [KeyPress] = keypress,
 257         [MappingNotify] = mappingnotify,
 258         [MapRequest] = maprequest,
 259         [PropertyNotify] = propertynotify,
 260         [UnmapNotify] = unmapnotify
 261 };
 262 static Atom wmatom[WMLast], netatom[NetLast];
 263 static Bool otherwm;
 264 static Bool running = True;
 265 static Cursor cursor[CurLast];
 266 static Display *dpy;
 267 static DC dc;
 268 static Monitor *mons = NULL, *selmon = NULL;
 269 static Window root;
 270
 271 /* configuration, allows nested code to access above variables */
 272 #include "config.h"
 273
 274 /* compile-time check if all tags fit into an unsigned int bit array. */
 275 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 276
 277 /* function implementations */
 278 void
 279 applyrules(Client *c) {
 280         const char *class, *instance;
 281         unsigned int i;
 282         const Rule *r;
 283         Monitor *m;
 284         XClassHint ch = { 0 };
 285
 286         /* rule matching */
 287         c->isfloating = c->tags = 0;
 288         if(XGetClassHint(dpy, c->win, &ch)) {
 289                 class = ch.res_class ? ch.res_class : broken;
 290                 instance = ch.res_name ? ch.res_name : broken;
 291                 for(i = 0; i < LENGTH(rules); i++) {
 292                         r = &rules[i];
 293                         if((!r->title || strstr(c->name, r->title))
 294                         && (!r->class || strstr(class, r->class))
 295                         && (!r->instance || strstr(instance, r->instance)))
 296                         {
 297                                 c->isfloating = r->isfloating;
 298                                 c->tags |= r->tags;
 299                                 for(m = mons; m && m->num != r->monitor; m = m->next);
 300                                 if(m)
 301                                         c->mon = m;
 302                         }
 303                 }
 304                 if(ch.res_class)
 305                         XFree(ch.res_class);
 306                 if(ch.res_name)
 307                         XFree(ch.res_name);
 308         }
 309         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 310 }
 311
 312 Bool
 313 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 314         Bool baseismin;
 315         Monitor *m = c->mon;
 316
 317         /* set minimum possible */
 318         *w = MAX(1, *w);
 319         *h = MAX(1, *h);
 320         if(interact) {
 321                 if(*x > sw)
 322                         *x = sw - WIDTH(c);
 323                 if(*y > sh)
 324                         *y = sh - HEIGHT(c);
 325                 if(*x + *w + 2 * c->bw < 0)
 326                         *x = 0;
 327                 if(*y + *h + 2 * c->bw < 0)
 328                         *y = 0;
 329         }
 330         else {
 331                 if(*x > m->mx + m->mw)
 332                         *x = m->mx + m->mw - WIDTH(c);
 333                 if(*y > m->my + m->mh)
 334                         *y = m->my + m->mh - HEIGHT(c);
 335                 if(*x + *w + 2 * c->bw < m->mx)
 336                         *x = m->mx;
 337                 if(*y + *h + 2 * c->bw < m->my)
 338                         *y = m->my;
 339         }
 340         if(*h < bh)
 341                 *h = bh;
 342         if(*w < bh)
 343                 *w = bh;
 344         if(resizehints || c->isfloating) {
 345                 /* see last two sentences in ICCCM 4.1.2.3 */
 346                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 347                 if(!baseismin) { /* temporarily remove base dimensions */
 348                         *w -= c->basew;
 349                         *h -= c->baseh;
 350                 }
 351                 /* adjust for aspect limits */
 352                 if(c->mina > 0 && c->maxa > 0) {
 353                         if(c->maxa < (float)*w / *h)
 354                                 *w = *h * c->maxa + 0.5;
 355                         else if(c->mina < (float)*h / *w)
 356                                 *h = *w * c->mina + 0.5;
 357                 }
 358                 if(baseismin) { /* increment calculation requires this */
 359                         *w -= c->basew;
 360                         *h -= c->baseh;
 361                 }
 362                 /* adjust for increment value */
 363                 if(c->incw)
 364                         *w -= *w % c->incw;
 365                 if(c->inch)
 366                         *h -= *h % c->inch;
 367                 /* restore base dimensions */
 368                 *w += c->basew;
 369                 *h += c->baseh;
 370                 *w = MAX(*w, c->minw);
 371                 *h = MAX(*h, c->minh);
 372                 if(c->maxw)
 373                         *w = MIN(*w, c->maxw);
 374                 if(c->maxh)
 375                         *h = MIN(*h, c->maxh);
 376         }
 377         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 378 }
 379
 380 void
 381 arrange(void) {
 382         Monitor *m;
 383
 384         for(m = mons; m; m = m->next)
 385                 showhide(m->stack);
 386         focus(NULL);
 387         for(m = mons; m; m = m->next) {
 388                 m->ltsymbol = m->lt[m->sellt]->symbol;
 389                 if(m->lt[m->sellt]->arrange)
 390                         m->lt[m->sellt]->arrange(m);
 391                 restack(m);
 392         }
 393 }
 394
 395 void
 396 attach(Client *c) {
 397         c->next = c->mon->clients;
 398         c->mon->clients = c;
 399 }
 400
 401 void
 402 attachstack(Client *c) {
 403         c->snext = c->mon->stack;
 404         c->mon->stack = c;
 405 }
 406
 407 void
 408 buttonpress(XEvent *e) {
 409         unsigned int i, x, click;
 410         Arg arg = {0};
 411         Client *c;
 412         Monitor *m;
 413         XButtonPressedEvent *ev = &e->xbutton;
 414
 415         click = ClkRootWin;
 416         /* focus monitor if necessary */
 417         if((m = wintomon(ev->window)) && m != selmon) {
 418                 unfocus(selmon->sel);
 419                 selmon = m;
 420                 focus(NULL);
 421         }
 422         if(ev->window == selmon->barwin) {
 423                 i = x = 0;
 424                 do {
 425                         x += TEXTW(tags[i]);
 426                 } while(ev->x >= x && ++i < LENGTH(tags));
 427                 if(i < LENGTH(tags)) {
 428                         click = ClkTagBar;
 429                         arg.ui = 1 << i;
 430                 }
 431                 else if(ev->x < x + blw)
 432                         click = ClkLtSymbol;
 433                 else if(ev->x > selmon->wx + selmon->ww - TEXTW(stext))
 434                         click = ClkStatusText;
 435                 else
 436                         click = ClkWinTitle;
 437         }
 438         else if((c = wintoclient(ev->window))) {
 439                 focus(c);
 440                 click = ClkClientWin;
 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         /* this causes an error if some other window manager is running */
 453         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 454         XSync(dpy, False);
 455         if(otherwm)
 456                 die("dwm: another window manager is already running\n");
 457         XSetErrorHandler(xerror);
 458         XSync(dpy, False);
 459 }
 460
 461 void
 462 cleanup(void) {
 463         Arg a = {.ui = ~0};
 464         Layout foo = { "", NULL };
 465         Monitor *m;
 466
 467         view(&a);
 468         selmon->lt[selmon->sellt] = &foo;
 469         for(m = mons; m; m = m->next)
 470                 while(m->stack)
 471                         unmanage(m->stack, False);
 472         if(dc.font.set)
 473                 XFreeFontSet(dpy, dc.font.set);
 474         else
 475                 XFreeFont(dpy, dc.font.xfont);
 476         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 477         XFreePixmap(dpy, dc.drawable);
 478         XFreeGC(dpy, dc.gc);
 479         XFreeCursor(dpy, cursor[CurNormal]);
 480         XFreeCursor(dpy, cursor[CurResize]);
 481         XFreeCursor(dpy, cursor[CurMove]);
 482         cleanupmons();
 483         XSync(dpy, False);
 484         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 485 }
 486
 487 void
 488 cleanupmons(void) {
 489         Monitor *m;
 490
 491         while(mons) {
 492                 m = mons->next;
 493                 XUnmapWindow(dpy, mons->barwin);
 494                 XDestroyWindow(dpy, mons->barwin);
 495                 free(mons);
 496                 mons = m;
 497         }
 498 }
 499
 500 void
 501 clearurgent(Client *c) {
 502         XWMHints *wmh;
 503
 504         c->isurgent = False;
 505         if(!(wmh = XGetWMHints(dpy, c->win)))
 506                 return;
 507         wmh->flags &= ~XUrgencyHint;
 508         XSetWMHints(dpy, c->win, wmh);
 509         XFree(wmh);
 510 }
 511
 512 void
 513 configure(Client *c) {
 514         XConfigureEvent ce;
 515
 516         ce.type = ConfigureNotify;
 517         ce.display = dpy;
 518         ce.event = c->win;
 519         ce.window = c->win;
 520         ce.x = c->x;
 521         ce.y = c->y;
 522         ce.width = c->w;
 523         ce.height = c->h;
 524         ce.border_width = c->bw;
 525         ce.above = None;
 526         ce.override_redirect = False;
 527         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 528 }
 529
 530 void
 531 configurenotify(XEvent *e) {
 532         Monitor *m;
 533         XConfigureEvent *ev = &e->xconfigure;
 534
 535         if(ev->window == root) {
 536                 sw = ev->width;
 537                 sh = ev->height;
 538                 updategeom();
 539                 if(dc.drawable != 0)
 540                         XFreePixmap(dpy, dc.drawable);
 541                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 542                 updatebars();
 543                 for(m = mons; m; m = m->next)
 544                         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 545                 arrange();
 546         }
 547 }
 548
 549 void
 550 configurerequest(XEvent *e) {
 551         Client *c;
 552         Monitor *m;
 553         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 554         XWindowChanges wc;
 555
 556         if((c = wintoclient(ev->window))) {
 557                 if(ev->value_mask & CWBorderWidth)
 558                         c->bw = ev->border_width;
 559                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 560                         m = c->mon;
 561                         if(ev->value_mask & CWX)
 562                                 c->x = m->mx + ev->x;
 563                         if(ev->value_mask & CWY)
 564                                 c->y = m->my + ev->y;
 565                         if(ev->value_mask & CWWidth)
 566                                 c->w = ev->width;
 567                         if(ev->value_mask & CWHeight)
 568                                 c->h = ev->height;
 569                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 570                                 c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 571                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 572                                 c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 573                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 574                                 configure(c);
 575                         if(ISVISIBLE(c))
 576                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 577                 }
 578                 else
 579                         configure(c);
 580         }
 581         else {
 582                 wc.x = ev->x;
 583                 wc.y = ev->y;
 584                 wc.width = ev->width;
 585                 wc.height = ev->height;
 586                 wc.border_width = ev->border_width;
 587                 wc.sibling = ev->above;
 588                 wc.stack_mode = ev->detail;
 589                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 590         }
 591         XSync(dpy, False);
 592 }
 593
 594 void
 595 destroynotify(XEvent *e) {
 596         Client *c;
 597         XDestroyWindowEvent *ev = &e->xdestroywindow;
 598
 599         if((c = wintoclient(ev->window)))
 600                 unmanage(c, True);
 601 }
 602
 603 void
 604 detach(Client *c) {
 605         Client **tc;
 606
 607         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 608         *tc = c->next;
 609 }
 610
 611 void
 612 detachstack(Client *c) {
 613         Client **tc, *t;
 614
 615         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 616         *tc = c->snext;
 617
 618         if(c == c->mon->sel) {
 619                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 620                 c->mon->sel = t;
 621         }
 622 }
 623
 624 void
 625 die(const char *errstr, ...) {
 626         va_list ap;
 627
 628         va_start(ap, errstr);
 629         vfprintf(stderr, errstr, ap);
 630         va_end(ap);
 631         exit(EXIT_FAILURE);
 632 }
 633
 634 Monitor *
 635 dirtomon(int dir) {
 636         Monitor *m = NULL;
 637
 638         if(dir > 0) {
 639                 if(!(m = selmon->next))
 640                         m = mons;
 641         }
 642         else {
 643                 if(selmon == mons)
 644                         for(m = mons; m->next; m = m->next);
 645                 else
 646                         for(m = mons; m->next != selmon; m = m->next);
 647         }
 648         return m;
 649 }
 650
 651 void
 652 drawbar(Monitor *m) {
 653         int x;
 654         unsigned int i, occ = 0, urg = 0;
 655         unsigned long *col;
 656         Client *c;
 657
 658         for(c = m->clients; c; c = c->next) {
 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         dc.w = blw = TEXTW(m->ltsymbol);
 673         drawtext(m->ltsymbol, dc.norm, False);
 674         dc.x += dc.w;
 675         x = dc.x;
 676         if(m == selmon) { /* status is only drawn on selected monitor */
 677                 dc.w = TEXTW(stext);
 678                 dc.x = m->ww - dc.w;
 679                 if(dc.x < x) {
 680                         dc.x = x;
 681                         dc.w = m->ww - x;
 682                 }
 683                 drawtext(stext, dc.norm, False);
 684         }
 685         else
 686                 dc.x = m->ww;
 687         if((dc.w = dc.x - x) > bh) {
 688                 dc.x = x;
 689                 if(m->sel) {
 690                         col = m == selmon ? dc.sel : dc.norm;
 691                         drawtext(m->sel->name, col, False);
 692                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 693                 }
 694                 else
 695                         drawtext(NULL, dc.norm, False);
 696         }
 697         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 698         XSync(dpy, False);
 699 }
 700
 701 void
 702 drawbars(void) {
 703         Monitor *m;
 704
 705         for(m = mons; m; m = m->next)
 706                 drawbar(m);
 707 }
 708
 709 void
 710 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 711         int x;
 712         XGCValues gcv;
 713         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 714
 715         gcv.foreground = col[invert ? ColBG : ColFG];
 716         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 717         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 718         r.x = dc.x + 1;
 719         r.y = dc.y + 1;
 720         if(filled) {
 721                 r.width = r.height = x + 1;
 722                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 723         }
 724         else if(empty) {
 725                 r.width = r.height = x;
 726                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 727         }
 728 }
 729
 730 void
 731 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 732         char buf[256];
 733         int i, x, y, h, len, olen;
 734         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 735
 736         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 737         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 738         if(!text)
 739                 return;
 740         olen = strlen(text);
 741         h = dc.font.ascent + dc.font.descent;
 742         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 743         x = dc.x + (h / 2);
 744         /* shorten text if necessary */
 745         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 746         if(!len)
 747                 return;
 748         memcpy(buf, text, len);
 749         if(len < olen)
 750                 for(i = len; i && i > len - 3; buf[--i] = '.');
 751         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 752         if(dc.font.set)
 753                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 754         else
 755                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 756 }
 757
 758 void
 759 enternotify(XEvent *e) {
 760         Client *c;
 761         Monitor *m;
 762         XCrossingEvent *ev = &e->xcrossing;
 763
 764         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 765                 return;
 766         if((m = wintomon(ev->window)) && m != selmon) {
 767                 unfocus(selmon->sel);
 768                 selmon = m;
 769         }
 770         if((c = wintoclient(ev->window)))
 771                 focus(c);
 772         else
 773                 focus(NULL);
 774 }
 775
 776 void
 777 expose(XEvent *e) {
 778         Monitor *m;
 779         XExposeEvent *ev = &e->xexpose;
 780
 781         if(ev->count == 0 && (m = wintomon(ev->window)))
 782                 drawbar(m);
 783 }
 784
 785 void
 786 focus(Client *c) {
 787         if(!c || !ISVISIBLE(c))
 788                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 789         if(selmon->sel)
 790                 unfocus(selmon->sel);
 791         if(c) {
 792                 if(c->mon != selmon)
 793                         selmon = c->mon;
 794                 if(c->isurgent)
 795                         clearurgent(c);
 796                 detachstack(c);
 797                 attachstack(c);
 798                 grabbuttons(c, True);
 799                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 800                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 801         }
 802         else
 803                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 804         selmon->sel = c;
 805         drawbars();
 806 }
 807
 808 void
 809 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 810         XFocusChangeEvent *ev = &e->xfocus;
 811
 812         if(selmon->sel && ev->window != selmon->sel->win)
 813                 XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 814 }
 815
 816 void
 817 focusmon(const Arg *arg) {
 818         Monitor *m = NULL;
 819
 820         if(!mons->next)
 821                 return;
 822         m = dirtomon(arg->i);
 823         unfocus(selmon->sel);
 824         selmon = m;
 825         focus(NULL);
 826 }
 827
 828 void
 829 focusstack(const Arg *arg) {
 830         Client *c = NULL, *i;
 831
 832         if(!selmon->sel)
 833                 return;
 834         if(arg->i > 0) {
 835                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 836                 if(!c)
 837                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 838         }
 839         else {
 840                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 841                         if(ISVISIBLE(i))
 842                                 c = i;
 843                 if(!c)
 844                         for(; i; i = i->next)
 845                                 if(ISVISIBLE(i))
 846                                         c = i;
 847         }
 848         if(c) {
 849                 focus(c);
 850                 restack(selmon);
 851         }
 852 }
 853
 854 unsigned long
 855 getcolor(const char *colstr) {
 856         Colormap cmap = DefaultColormap(dpy, screen);
 857         XColor color;
 858
 859         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 860                 die("error, cannot allocate color '%s'\n", colstr);
 861         return color.pixel;
 862 }
 863
 864 Bool
 865 getrootptr(int *x, int *y) {
 866         int di;
 867         unsigned int dui;
 868         Window dummy;
 869
 870         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 871 }
 872
 873 long
 874 getstate(Window w) {
 875         int format, status;
 876         long result = -1;
 877         unsigned char *p = NULL;
 878         unsigned long n, extra;
 879         Atom real;
 880
 881         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 882                                     &real, &format, &n, &extra, (unsigned char **)&p);
 883         if(status != Success)
 884                 return -1;
 885         if(n != 0)
 886                 result = *p;
 887         XFree(p);
 888         return result;
 889 }
 890
 891 Bool
 892 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 893         char **list = NULL;
 894         int n;
 895         XTextProperty name;
 896
 897         if(!text || size == 0)
 898                 return False;
 899         text[0] = '\0';
 900         XGetTextProperty(dpy, w, &name, atom);
 901         if(!name.nitems)
 902                 return False;
 903         if(name.encoding == XA_STRING)
 904                 strncpy(text, (char *)name.value, size - 1);
 905         else {
 906                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 907                         strncpy(text, *list, size - 1);
 908                         XFreeStringList(list);
 909                 }
 910         }
 911         text[size - 1] = '\0';
 912         XFree(name.value);
 913         return True;
 914 }
 915
 916 void
 917 grabbuttons(Client *c, Bool focused) {
 918         updatenumlockmask();
 919         {
 920                 unsigned int i, j;
 921                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 922                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 923                 if(focused) {
 924                         for(i = 0; i < LENGTH(buttons); i++)
 925                                 if(buttons[i].click == ClkClientWin)
 926                                         for(j = 0; j < LENGTH(modifiers); j++)
 927                                                 XGrabButton(dpy, buttons[i].button,
 928                                                             buttons[i].mask | modifiers[j],
 929                                                             c->win, False, BUTTONMASK,
 930                                                             GrabModeAsync, GrabModeSync, None, None);
 931                 }
 932                 else
 933                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 934                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 935         }
 936 }
 937
 938 void
 939 grabkeys(void) {
 940         updatenumlockmask();
 941         {
 942                 unsigned int i, j;
 943                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 944                 KeyCode code;
 945
 946                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 947                 for(i = 0; i < LENGTH(keys); i++) {
 948                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 949                                 for(j = 0; j < LENGTH(modifiers); j++)
 950                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 951                                                  True, GrabModeAsync, GrabModeAsync);
 952                 }
 953         }
 954 }
 955
 956 void
 957 initfont(const char *fontstr) {
 958         char *def, **missing;
 959         int i, n;
 960
 961         missing = NULL;
 962         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 963         if(missing) {
 964                 while(n--)
 965                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 966                 XFreeStringList(missing);
 967         }
 968         if(dc.font.set) {
 969                 XFontSetExtents *font_extents;
 970                 XFontStruct **xfonts;
 971                 char **font_names;
 972
 973                 dc.font.ascent = dc.font.descent = 0;
 974                 font_extents = XExtentsOfFontSet(dc.font.set);
 975                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 976                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 977                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 978                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
 979                         xfonts++;
 980                 }
 981         }
 982         else {
 983                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 984                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 985                         die("error, cannot load font: '%s'\n", fontstr);
 986                 dc.font.ascent = dc.font.xfont->ascent;
 987                 dc.font.descent = dc.font.xfont->descent;
 988         }
 989         dc.font.height = dc.font.ascent + dc.font.descent;
 990 }
 991
 992 Bool
 993 isprotodel(Client *c) {
 994         int i, n;
 995         Atom *protocols;
 996         Bool ret = False;
 997
 998         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 999                 for(i = 0; !ret && i < n; i++)
1000                         if(protocols[i] == wmatom[WMDelete])
1001                                 ret = True;
1002                 XFree(protocols);
1003         }
1004         return ret;
1005 }
1006
1007 void
1008 keypress(XEvent *e) {
1009         unsigned int i;
1010         KeySym keysym;
1011         XKeyEvent *ev;
1012
1013         ev = &e->xkey;
1014         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1015         for(i = 0; i < LENGTH(keys); i++)
1016                 if(keysym == keys[i].keysym
1017                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1018                 && keys[i].func)
1019                         keys[i].func(&(keys[i].arg));
1020 }
1021
1022 void
1023 killclient(const Arg *arg) {
1024         XEvent ev;
1025
1026         if(!selmon->sel)
1027                 return;
1028         if(isprotodel(selmon->sel)) {
1029                 ev.type = ClientMessage;
1030                 ev.xclient.window = selmon->sel->win;
1031                 ev.xclient.message_type = wmatom[WMProtocols];
1032                 ev.xclient.format = 32;
1033                 ev.xclient.data.l[0] = wmatom[WMDelete];
1034                 ev.xclient.data.l[1] = CurrentTime;
1035                 XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1036         }
1037         else {
1038                 XGrabServer(dpy);
1039                 XSetErrorHandler(xerrordummy);
1040                 XSetCloseDownMode(dpy, DestroyAll);
1041                 XKillClient(dpy, selmon->sel->win);
1042                 XSync(dpy, False);
1043                 XSetErrorHandler(xerror);
1044                 XUngrabServer(dpy);
1045         }
1046 }
1047
1048 void
1049 manage(Window w, XWindowAttributes *wa) {
1050         static Client cz;
1051         Client *c, *t = NULL;
1052         Window trans = None;
1053         XWindowChanges wc;
1054
1055         if(!(c = malloc(sizeof(Client))))
1056                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1057         *c = cz;
1058         c->win = w;
1059         updatetitle(c);
1060         if(XGetTransientForHint(dpy, w, &trans))
1061                 t = wintoclient(trans);
1062         if(t) {
1063                 c->mon = t->mon;
1064                 c->tags = t->tags;
1065         }
1066         else {
1067                 c->mon = selmon;
1068                 applyrules(c);
1069         }
1070         /* geometry */
1071         c->x = wa->x + c->mon->wx;
1072         c->y = wa->y + c->mon->wy;
1073         c->w = wa->width;
1074         c->h = wa->height;
1075         c->oldbw = wa->border_width;
1076         if(c->w == c->mon->mw && c->h == c->mon->mh) {
1077                 c->x = c->mon->mx;
1078                 c->y = c->mon->my;
1079                 c->bw = 0;
1080         }
1081         else {
1082                 if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1083                         c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1084                 if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1085                         c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1086                 c->x = MAX(c->x, c->mon->mx);
1087                 /* only fix client y-offset, if the client center might cover the bar */
1088                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1089                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1090                 c->bw = borderpx;
1091         }
1092         wc.border_width = c->bw;
1093         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1094         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1095         configure(c); /* propagates border_width, if size doesn't change */
1096         updatesizehints(c);
1097         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1098         grabbuttons(c, False);
1099         if(!c->isfloating)
1100                 c->isfloating = trans != None || c->isfixed;
1101         if(c->isfloating)
1102                 XRaiseWindow(dpy, c->win);
1103         attach(c);
1104         attachstack(c);
1105         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1106         XMapWindow(dpy, c->win);
1107         setclientstate(c, NormalState);
1108         arrange();
1109 }
1110
1111 void
1112 mappingnotify(XEvent *e) {
1113         XMappingEvent *ev = &e->xmapping;
1114
1115         XRefreshKeyboardMapping(ev);
1116         if(ev->request == MappingKeyboard)
1117                 grabkeys();
1118 }
1119
1120 void
1121 maprequest(XEvent *e) {
1122         static XWindowAttributes wa;
1123         XMapRequestEvent *ev = &e->xmaprequest;
1124
1125         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1126                 return;
1127         if(wa.override_redirect)
1128                 return;
1129         if(!wintoclient(ev->window))
1130                 manage(ev->window, &wa);
1131 }
1132
1133 void
1134 monocle(Monitor *m) {
1135         static char ntext[8];
1136         unsigned int n = 0;
1137         Client *c;
1138
1139         for(c = m->clients; c; c = c->next)
1140                 if(ISVISIBLE(c))
1141                         n++;
1142         if(n > 0) { /* override layout symbol */
1143                 snprintf(ntext, sizeof ntext, "[%d]", n);
1144                 m->ltsymbol = ntext;
1145         }
1146         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1147                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1148 }
1149
1150 void
1151 movemouse(const Arg *arg) {
1152         int x, y, ocx, ocy, nx, ny;
1153         Client *c;
1154         Monitor *m;
1155         XEvent ev;
1156
1157         if(!(c = selmon->sel))
1158                 return;
1159         restack(selmon);
1160         ocx = c->x;
1161         ocy = c->y;
1162         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1163         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1164                 return;
1165         if(!getrootptr(&x, &y))
1166                 return;
1167         do {
1168                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1169                 switch (ev.type) {
1170                 case ConfigureRequest:
1171                 case Expose:
1172                 case MapRequest:
1173                         handler[ev.type](&ev);
1174                         break;
1175                 case MotionNotify:
1176                         nx = ocx + (ev.xmotion.x - x);
1177                         ny = ocy + (ev.xmotion.y - y);
1178                         if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1179                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1180                                 if(abs(selmon->wx - nx) < snap)
1181                                         nx = selmon->wx;
1182                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1183                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1184                                 if(abs(selmon->wy - ny) < snap)
1185                                         ny = selmon->wy;
1186                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1187                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1188                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1189                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1190                                         togglefloating(NULL);
1191                         }
1192                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1193                                 resize(c, nx, ny, c->w, c->h, True);
1194                         break;
1195                 }
1196         } while(ev.type != ButtonRelease);
1197         XUngrabPointer(dpy, CurrentTime);
1198         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1199                 sendmon(c, m);
1200                 selmon = m;
1201                 focus(NULL);
1202         }
1203 }
1204
1205 Client *
1206 nexttiled(Client *c) {
1207         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1208         return c;
1209 }
1210
1211 Monitor *
1212 ptrtomon(int x, int y) {
1213         Monitor *m;
1214
1215         for(m = mons; m; m = m->next)
1216                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1217                         return m;
1218         return selmon;
1219 }
1220
1221 void
1222 propertynotify(XEvent *e) {
1223         Client *c;
1224         Window trans;
1225         XPropertyEvent *ev = &e->xproperty;
1226
1227         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1228                 updatestatus();
1229         else if(ev->state == PropertyDelete)
1230                 return; /* ignore */
1231         else if((c = wintoclient(ev->window))) {
1232                 switch (ev->atom) {
1233                 default: break;
1234                 case XA_WM_TRANSIENT_FOR:
1235                         XGetTransientForHint(dpy, c->win, &trans);
1236                         if(!c->isfloating && (c->isfloating = (wintoclient(trans) != NULL)))
1237                                 arrange();
1238                         break;
1239                 case XA_WM_NORMAL_HINTS:
1240                         updatesizehints(c);
1241                         break;
1242                 case XA_WM_HINTS:
1243                         updatewmhints(c);
1244                         drawbars();
1245                         break;
1246                 }
1247                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1248                         updatetitle(c);
1249                         if(c == c->mon->sel)
1250                                 drawbar(c->mon);
1251                 }
1252         }
1253 }
1254
1255 void
1256 quit(const Arg *arg) {
1257         running = False;
1258 }
1259
1260 void
1261 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1262         XWindowChanges wc;
1263
1264         if(applysizehints(c, &x, &y, &w, &h, interact)) {
1265                 c->x = wc.x = x;
1266                 c->y = wc.y = y;
1267                 c->w = wc.width = w;
1268                 c->h = wc.height = h;
1269                 wc.border_width = c->bw;
1270                 XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1271                 configure(c);
1272                 XSync(dpy, False);
1273         }
1274 }
1275
1276 void
1277 resizemouse(const Arg *arg) {
1278         int ocx, ocy;
1279         int nw, nh;
1280         Client *c;
1281         Monitor *m;
1282         XEvent ev;
1283
1284         if(!(c = selmon->sel))
1285                 return;
1286         restack(selmon);
1287         ocx = c->x;
1288         ocy = c->y;
1289         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1290                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1291                 return;
1292         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1293         do {
1294                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1295                 switch(ev.type) {
1296                 case ConfigureRequest:
1297                 case Expose:
1298                 case MapRequest:
1299                         handler[ev.type](&ev);
1300                         break;
1301                 case MotionNotify:
1302                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1303                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1304                         if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1305                         && nh >= selmon->wy && nh <= selmon->wy + selmon->wh)
1306                         {
1307                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1308                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1309                                         togglefloating(NULL);
1310                         }
1311                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1312                                 resize(c, c->x, c->y, nw, nh, True);
1313                         break;
1314                 }
1315         } while(ev.type != ButtonRelease);
1316         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1317         XUngrabPointer(dpy, CurrentTime);
1318         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1319         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1320                 sendmon(c, m);
1321                 selmon = m;
1322                 focus(NULL);
1323         }
1324 }
1325
1326 void
1327 restack(Monitor *m) {
1328         Client *c;
1329         XEvent ev;
1330         XWindowChanges wc;
1331
1332         drawbars();
1333         if(!m->sel)
1334                 return;
1335         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1336                 XRaiseWindow(dpy, m->sel->win);
1337         if(m->lt[m->sellt]->arrange) {
1338                 wc.stack_mode = Below;
1339                 wc.sibling = m->barwin;
1340                 for(c = m->stack; c; c = c->snext)
1341                         if(!c->isfloating && ISVISIBLE(c)) {
1342                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1343                                 wc.sibling = c->win;
1344                         }
1345         }
1346         XSync(dpy, False);
1347         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1348 }
1349
1350 void
1351 run(void) {
1352         XEvent ev;
1353
1354         /* main event loop */
1355         XSync(dpy, False);
1356         while(running && !XNextEvent(dpy, &ev))
1357                 if(handler[ev.type])
1358                         handler[ev.type](&ev); /* call handler */
1359 }
1360
1361 void
1362 scan(void) {
1363         unsigned int i, num;
1364         Window d1, d2, *wins = NULL;
1365         XWindowAttributes wa;
1366
1367         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1368                 for(i = 0; i < num; i++) {
1369                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1370                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1371                                 continue;
1372                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1373                                 manage(wins[i], &wa);
1374                 }
1375                 for(i = 0; i < num; i++) { /* now the transients */
1376                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1377                                 continue;
1378                         if(XGetTransientForHint(dpy, wins[i], &d1)
1379                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1380                                 manage(wins[i], &wa);
1381                 }
1382                 if(wins)
1383                         XFree(wins);
1384         }
1385 }
1386
1387 void
1388 sendmon(Client *c, Monitor *m) {
1389         if(c->mon == m)
1390                 return;
1391         unfocus(c);
1392         detach(c);
1393         detachstack(c);
1394         c->mon = m;
1395         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1396         attach(c);
1397         attachstack(c);
1398         focus(NULL);
1399         arrange();
1400 }
1401
1402 void
1403 setclientstate(Client *c, long state) {
1404         long data[] = { state, None };
1405
1406         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1407                         PropModeReplace, (unsigned char *)data, 2);
1408 }
1409
1410 void
1411 setlayout(const Arg *arg) {
1412         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1413                 selmon->sellt ^= 1;
1414         if(arg && arg->v)
1415                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1416         if(selmon->sel)
1417                 arrange();
1418         else
1419                 drawbars();
1420 }
1421
1422 /* arg > 1.0 will set mfact absolutly */
1423 void
1424 setmfact(const Arg *arg) {
1425         float f;
1426
1427         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1428                 return;
1429         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1430         if(f < 0.1 || f > 0.9)
1431                 return;
1432         selmon->mfact = f;
1433         arrange();
1434 }
1435
1436 void
1437 setup(void) {
1438         XSetWindowAttributes wa;
1439
1440         /* clean up any zombies immediately */
1441         sigchld(0);
1442
1443         /* init screen */
1444         screen = DefaultScreen(dpy);
1445         root = RootWindow(dpy, screen);
1446         initfont(font);
1447         sw = DisplayWidth(dpy, screen);
1448         sh = DisplayHeight(dpy, screen);
1449         bh = dc.h = dc.font.height + 2;
1450         updategeom();
1451         /* init atoms */
1452         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1453         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1454         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1455         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1456         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1457         /* init cursors */
1458         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1459         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1460         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1461         /* init appearance */
1462         dc.norm[ColBorder] = getcolor(normbordercolor);
1463         dc.norm[ColBG] = getcolor(normbgcolor);
1464         dc.norm[ColFG] = getcolor(normfgcolor);
1465         dc.sel[ColBorder] = getcolor(selbordercolor);
1466         dc.sel[ColBG] = getcolor(selbgcolor);
1467         dc.sel[ColFG] = getcolor(selfgcolor);
1468         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1469         dc.gc = XCreateGC(dpy, root, 0, NULL);
1470         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1471         if(!dc.font.set)
1472                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1473         /* init bars */
1474         updatebars();
1475         updatestatus();
1476         /* EWMH support per view */
1477         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1478                         PropModeReplace, (unsigned char *) netatom, NetLast);
1479         /* select for events */
1480         wa.cursor = cursor[CurNormal];
1481         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1482                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1483                         |PropertyChangeMask;
1484         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1485         XSelectInput(dpy, root, wa.event_mask);
1486         grabkeys();
1487 }
1488
1489 void
1490 showhide(Client *c) {
1491         if(!c)
1492                 return;
1493         if(ISVISIBLE(c)) { /* show clients top down */
1494                 XMoveWindow(dpy, c->win, c->x, c->y);
1495                 if(!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
1496                         resize(c, c->x, c->y, c->w, c->h, False);
1497                 showhide(c->snext);
1498         }
1499         else { /* hide clients bottom up */
1500                 showhide(c->snext);
1501                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1502         }
1503 }
1504
1505
1506 void
1507 sigchld(int unused) {
1508         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1509                 die("Can't install SIGCHLD handler");
1510         while(0 < waitpid(-1, NULL, WNOHANG));
1511 }
1512
1513 void
1514 spawn(const Arg *arg) {
1515         if(fork() == 0) {
1516                 if(dpy)
1517                         close(ConnectionNumber(dpy));
1518                 setsid();
1519                 execvp(((char **)arg->v)[0], (char **)arg->v);
1520                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1521                 perror(" failed");
1522                 exit(0);
1523         }
1524 }
1525
1526 void
1527 tag(const Arg *arg) {
1528         if(selmon->sel && arg->ui & TAGMASK) {
1529                 selmon->sel->tags = arg->ui & TAGMASK;
1530                 arrange();
1531         }
1532 }
1533
1534 void
1535 tagmon(const Arg *arg) {
1536         if(!selmon->sel || !mons->next)
1537                 return;
1538         sendmon(selmon->sel, dirtomon(arg->i));
1539 }
1540
1541 int
1542 textnw(const char *text, unsigned int len) {
1543         XRectangle r;
1544
1545         if(dc.font.set) {
1546                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1547                 return r.width;
1548         }
1549         return XTextWidth(dc.font.xfont, text, len);
1550 }
1551
1552 void
1553 tile(Monitor *m) {
1554         int x, y, h, w, mw;
1555         unsigned int i, n;
1556         Client *c;
1557
1558         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1559         if(n == 0)
1560                 return;
1561         /* master */
1562         c = nexttiled(m->clients);
1563         mw = m->mfact * m->ww;
1564         resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1565         if(--n == 0)
1566                 return;
1567         /* tile stack */
1568         x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1569         y = m->wy;
1570         w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1571         h = m->wh / n;
1572         if(h < bh)
1573                 h = m->wh;
1574         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1575                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1576                        ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1577                 if(h != m->wh)
1578                         y = c->y + HEIGHT(c);
1579         }
1580 }
1581
1582 void
1583 togglebar(const Arg *arg) {
1584         selmon->showbar = !selmon->showbar;
1585         updatebarpos(selmon);
1586         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1587         arrange();
1588 }
1589
1590 void
1591 togglefloating(const Arg *arg) {
1592         if(!selmon->sel)
1593                 return;
1594         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1595         if(selmon->sel->isfloating)
1596                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1597                        selmon->sel->w, selmon->sel->h, False);
1598         arrange();
1599 }
1600
1601 void
1602 toggletag(const Arg *arg) {
1603         unsigned int newtags;
1604
1605         if(!selmon->sel)
1606                 return;
1607         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1608         if(newtags) {
1609                 selmon->sel->tags = newtags;
1610                 arrange();
1611         }
1612 }
1613
1614 void
1615 toggleview(const Arg *arg) {
1616         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1617
1618         if(newtagset) {
1619                 selmon->tagset[selmon->seltags] = newtagset;
1620                 arrange();
1621         }
1622 }
1623
1624 void
1625 unfocus(Client *c) {
1626         if(!c)
1627                 return;
1628         grabbuttons(c, False);
1629         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1630         XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1631 }
1632
1633 void
1634 unmanage(Client *c, Bool destroyed) {
1635         XWindowChanges wc;
1636
1637         /* The server grab construct avoids race conditions. */
1638         detach(c);
1639         detachstack(c);
1640         if(!destroyed) {
1641                 wc.border_width = c->oldbw;
1642                 XGrabServer(dpy);
1643                 XSetErrorHandler(xerrordummy);
1644                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1645                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1646                 setclientstate(c, WithdrawnState);
1647                 XSync(dpy, False);
1648                 XSetErrorHandler(xerror);
1649                 XUngrabServer(dpy);
1650         }
1651         free(c);
1652         focus(NULL);
1653         arrange();
1654 }
1655
1656 void
1657 unmapnotify(XEvent *e) {
1658         Client *c;
1659         XUnmapEvent *ev = &e->xunmap;
1660
1661         if((c = wintoclient(ev->window)))
1662                 unmanage(c, False);
1663 }
1664
1665 void
1666 updatebars(void) {
1667         Monitor *m;
1668         XSetWindowAttributes wa;
1669
1670         wa.override_redirect = True;
1671         wa.background_pixmap = ParentRelative;
1672         wa.event_mask = ButtonPressMask|ExposureMask;
1673         for(m = mons; m; m = m->next) {
1674                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1675                                           CopyFromParent, DefaultVisual(dpy, screen),
1676                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1677                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1678                 XMapRaised(dpy, m->barwin);
1679         }
1680 }
1681
1682 void
1683 updatebarpos(Monitor *m) {
1684         m->wy = m->my;
1685         m->wh = m->mh;
1686         if(m->showbar) {
1687                 m->wh -= bh;
1688                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1689                 m->wy = m->topbar ? m->wy + bh : m->wy;
1690         }
1691         else
1692                 m->by = -bh;
1693 }
1694
1695 void
1696 updategeom(void) {
1697         int i, n = 1;
1698         Client *c;
1699         Monitor *newmons = NULL, *m = NULL, *tm;
1700
1701 #ifdef XINERAMA
1702         int nn;
1703         XineramaScreenInfo *info = NULL;
1704
1705         if(XineramaIsActive(dpy))
1706                 info = XineramaQueryScreens(dpy, &n);
1707         for(i = 1, nn = n; i < n; i++)
1708                 if(info[i - 1].x_org == info[i].x_org && info[i - 1].y_org == info[i].y_org
1709                 && info[i - 1].width == info[i].width && info[i - 1].height == info[i].height)
1710                         --nn;
1711         n = nn; /* we only consider unique geometries as separate screens */
1712 #endif /* XINERAMA */
1713         /* allocate monitor(s) for the new geometry setup */
1714         for(i = 0; i < n; i++) {
1715                 if(!(m = (Monitor *)malloc(sizeof(Monitor))))
1716                         die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
1717                 m->next = newmons;
1718                 newmons = m;
1719         }
1720         /* initialise monitor(s) */
1721 #ifdef XINERAMA
1722         if(XineramaIsActive(dpy)) {
1723                 for(i = 0, m = newmons; m; m = m->next, i++) {
1724                         m->num = info[i].screen_number;
1725                         m->mx = m->wx = info[i].x_org;
1726                         m->my = m->wy = info[i].y_org;
1727                         m->mw = m->ww = info[i].width;
1728                         m->mh = m->wh = info[i].height;
1729                 }
1730                 XFree(info);
1731         }
1732         else
1733 #endif /* XINERAMA */
1734         /* default monitor setup */
1735         {
1736                 m->num = 0;
1737                 m->mx = m->wx = 0;
1738                 m->my = m->wy = 0;
1739                 m->mw = m->ww = sw;
1740                 m->mh = m->wh = sh;
1741         }
1742         /* bar geometry setup */
1743         for(m = newmons; m; m = m->next) {
1744                 m->sel = m->stack = m->clients = NULL;
1745                 m->seltags = 0;
1746                 m->sellt = 0;
1747                 m->tagset[0] = m->tagset[1] = 1;
1748                 m->mfact = mfact;
1749                 m->showbar = showbar;
1750                 m->topbar = topbar;
1751                 m->lt[0] = &layouts[0];
1752                 m->lt[1] = &layouts[1 % LENGTH(layouts)];
1753                 m->ltsymbol = layouts[0].symbol;
1754                 updatebarpos(m);
1755         }
1756         /* reassign left over clients of disappeared monitors */
1757         for(tm = mons; tm; tm = tm->next)
1758                 while(tm->clients) {
1759                         c = tm->clients;
1760                         tm->clients = c->next;
1761                         detachstack(c);
1762                         c->mon = newmons;
1763                         attach(c);
1764                         attachstack(c);
1765                 }
1766         /* select focused monitor */
1767         cleanupmons();
1768         selmon = mons = newmons;
1769         selmon = wintomon(root);
1770 }
1771
1772 void
1773 updatenumlockmask(void) {
1774         unsigned int i, j;
1775         XModifierKeymap *modmap;
1776
1777         numlockmask = 0;
1778         modmap = XGetModifierMapping(dpy);
1779         for(i = 0; i < 8; i++)
1780                 for(j = 0; j < modmap->max_keypermod; j++)
1781                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1782                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1783                                 numlockmask = (1 << i);
1784         XFreeModifiermap(modmap);
1785 }
1786
1787 void
1788 updatesizehints(Client *c) {
1789         long msize;
1790         XSizeHints size;
1791
1792         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1793                 /* size is uninitialized, ensure that size.flags aren't used */
1794                 size.flags = PSize;
1795         if(size.flags & PBaseSize) {
1796                 c->basew = size.base_width;
1797                 c->baseh = size.base_height;
1798         }
1799         else if(size.flags & PMinSize) {
1800                 c->basew = size.min_width;
1801                 c->baseh = size.min_height;
1802         }
1803         else
1804                 c->basew = c->baseh = 0;
1805         if(size.flags & PResizeInc) {
1806                 c->incw = size.width_inc;
1807                 c->inch = size.height_inc;
1808         }
1809         else
1810                 c->incw = c->inch = 0;
1811         if(size.flags & PMaxSize) {
1812                 c->maxw = size.max_width;
1813                 c->maxh = size.max_height;
1814         }
1815         else
1816                 c->maxw = c->maxh = 0;
1817         if(size.flags & PMinSize) {
1818                 c->minw = size.min_width;
1819                 c->minh = size.min_height;
1820         }
1821         else if(size.flags & PBaseSize) {
1822                 c->minw = size.base_width;
1823                 c->minh = size.base_height;
1824         }
1825         else
1826                 c->minw = c->minh = 0;
1827         if(size.flags & PAspect) {
1828                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1829                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1830         }
1831         else
1832                 c->maxa = c->mina = 0.0;
1833         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1834                      && c->maxw == c->minw && c->maxh == c->minh);
1835 }
1836
1837 void
1838 updatetitle(Client *c) {
1839         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1840                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1841         if(c->name[0] == '\0') /* hack to mark broken clients */
1842                 strcpy(c->name, broken);
1843 }
1844
1845 void
1846 updatestatus(void) {
1847         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1848                 strcpy(stext, "dwm-"VERSION);
1849         drawbar(selmon);
1850 }
1851
1852 void
1853 updatewmhints(Client *c) {
1854         XWMHints *wmh;
1855
1856         if((wmh = XGetWMHints(dpy, c->win))) {
1857                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1858                         wmh->flags &= ~XUrgencyHint;
1859                         XSetWMHints(dpy, c->win, wmh);
1860                 }
1861                 else
1862                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1863                 XFree(wmh);
1864         }
1865 }
1866
1867 void
1868 view(const Arg *arg) {
1869         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1870                 return;
1871         selmon->seltags ^= 1; /* toggle sel tagset */
1872         if(arg->ui & TAGMASK)
1873                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1874         arrange();
1875 }
1876
1877 Client *
1878 wintoclient(Window w) {
1879         Client *c;
1880         Monitor *m;
1881
1882         for(m = mons; m; m = m->next)
1883                 for(c = m->clients; c; c = c->next)
1884                         if(c->win == w)
1885                                 return c;
1886         return NULL;
1887 }
1888
1889 Monitor *
1890 wintomon(Window w) {
1891         int x, y;
1892         Client *c;
1893         Monitor *m;
1894
1895         if(w == root && getrootptr(&x, &y))
1896                 return ptrtomon(x, y);
1897         for(m = mons; m; m = m->next)
1898                 if(w == m->barwin)
1899                         return m;
1900         if((c = wintoclient(w)))
1901                 return c->mon;
1902         return selmon;
1903 }
1904
1905 /* There's no way to check accesses to destroyed windows, thus those cases are
1906  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1907  * default error handler, which may call exit.  */
1908 int
1909 xerror(Display *dpy, XErrorEvent *ee) {
1910         if(ee->error_code == BadWindow
1911         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1912         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1913         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1914         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1915         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1916         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1917         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1918         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1919                 return 0;
1920         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1921                         ee->request_code, ee->error_code);
1922         return xerrorxlib(dpy, ee); /* may call exit */
1923 }
1924
1925 int
1926 xerrordummy(Display *dpy, XErrorEvent *ee) {
1927         return 0;
1928 }
1929
1930 /* Startup Error handler to check if another window manager
1931  * is already running. */
1932 int
1933 xerrorstart(Display *dpy, XErrorEvent *ee) {
1934         otherwm = True;
1935         return -1;
1936 }
1937
1938 void
1939 zoom(const Arg *arg) {
1940         Client *c = selmon->sel;
1941
1942         if(!selmon->lt[selmon->sellt]->arrange
1943         || selmon->lt[selmon->sellt]->arrange == monocle
1944         || (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         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1962                 fputs("warning: no locale support\n", stderr);
1963         if(!(dpy = XOpenDisplay(NULL)))
1964                 die("dwm: cannot open display\n");
1965         checkotherwm();
1966         setup();
1967         scan();
1968         run();
1969         cleanup();
1970         XCloseDisplay(dpy);
1971         return 0;
1972 }