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  * Calls to fetch an X event from the event queue are blocking.  Due reading
  10  * status text from standard input, a select()-driven main loop has been
  11  * implemented which selects for reads on the X connection and STDIN_FILENO to
  12  * handle all data smoothly. The event handlers of dwm are organized in an
  13  * array which is accessed whenever a new event has been fetched. This allows
  14  * event dispatching in O(1) time.
  15  *
  16  * Each child of the root window is called a client, except windows which have
  17  * set the override_redirect flag.  Clients are organized in a global
  18  * doubly-linked client list, the focus history is remembered through a global
  19  * stack list. Each client contains an array of Bools of the same size as the
  20  * global tags array to indicate the tags of a client.
  21  *
  22  * Keys and tagging rules are organized as arrays and defined in config.h.
  23  *
  24  * To understand everything else, start reading main().
  25  */
  26 #include <errno.h>
  27 #include <locale.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <sys/select.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <regex.h>
  37 #include <X11/cursorfont.h>
  38 #include <X11/keysym.h>
  39 #include <X11/Xatom.h>
  40 #include <X11/Xlib.h>
  41 #include <X11/Xproto.h>
  42 #include <X11/Xutil.h>
  43 //#ifdef XINERAMA
  44 #include <X11/extensions/Xinerama.h>
  45 //#endif
  46
  47 /* macros */
  48 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  49 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  50 #define LENGTH(x)               (sizeof x / sizeof x[0])
  51 #define MAXTAGLEN               16
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53
  54
  55 /* enums */
  56 enum { BarTop, BarBot, BarOff };                        /* bar position */
  57 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  58 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  59 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  60 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
  61
  62 /* typedefs */
  63 typedef struct View View;
  64 typedef struct Client Client;
  65 struct Client {
  66         char name[256];
  67         int x, y, w, h;
  68         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  69         int minax, maxax, minay, maxay;
  70         long flags;
  71         unsigned int border, oldborder;
  72         Bool isbanned, isfixed, isfloating, isurgent;
  73         Bool *tags;
  74         Client *next;
  75         Client *prev;
  76         Client *snext;
  77         Window win;
  78 };
  79
  80 typedef struct {
  81         int x, y, w, h;
  82         unsigned long norm[ColLast];
  83         unsigned long sel[ColLast];
  84         Drawable drawable;
  85         GC gc;
  86         struct {
  87                 int ascent;
  88                 int descent;
  89                 int height;
  90                 XFontSet set;
  91                 XFontStruct *xfont;
  92         } font;
  93 } DC; /* draw context */
  94
  95 typedef struct {
  96         unsigned long mod;
  97         KeySym keysym;
  98         void (*func)(const char *arg);
  99         const char *arg;
 100 } Key;
 101
 102 typedef struct {
 103         const char *symbol;
 104         void (*arrange)(View *);
 105 } Layout;
 106
 107 typedef struct {
 108         const char *prop;
 109         const char *tag;
 110         Bool isfloating;
 111 } Rule;
 112
 113 struct View {
 114         unsigned int id;
 115         int x, y, w, h, wax, way, wah, waw;
 116         double mwfact;
 117         Layout *layout;
 118         Window barwin;
 119 };
 120
 121 /* function declarations */
 122 void applyrules(Client *c);
 123 void arrange(void);
 124 void attach(Client *c);
 125 void attachstack(Client *c);
 126 void ban(Client *c);
 127 void buttonpress(XEvent *e);
 128 void checkotherwm(void);
 129 void cleanup(void);
 130 void configure(Client *c);
 131 void configurenotify(XEvent *e);
 132 void configurerequest(XEvent *e);
 133 Bool conflicts(Client *c, unsigned int tidx);
 134 void destroynotify(XEvent *e);
 135 void detach(Client *c);
 136 void detachstack(Client *c);
 137 void drawbar(View *v);
 138 void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 139 void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 140 void *emallocz(unsigned int size);
 141 void enternotify(XEvent *e);
 142 void eprint(const char *errstr, ...);
 143 void expose(XEvent *e);
 144 unsigned int firstag(View *v);
 145 void floating(View *v); /* default floating layout */
 146 void focus(Client *c);
 147 void focusin(XEvent *e);
 148 void focusnext(const char *arg);
 149 void focusprev(const char *arg);
 150 Client *getclient(Window w);
 151 unsigned long getcolor(const char *colstr);
 152 View *getview(Client *c);
 153 View *getviewbar(Window barwin);
 154 long getstate(Window w);
 155 Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 156 void grabbuttons(Client *c, Bool focused);
 157 void grabkeys(void);
 158 unsigned int idxoftag(const char *t);
 159 void initfont(const char *fontstr);
 160 Bool isoccupied(unsigned int t);
 161 Bool isprotodel(Client *c);
 162 Bool isurgent(unsigned int t);
 163 Bool isvisible(Client *c);
 164 void keypress(XEvent *e);
 165 void killclient(const char *arg);
 166 void manage(Window w, XWindowAttributes *wa);
 167 void mappingnotify(XEvent *e);
 168 void maprequest(XEvent *e);
 169 View *viewat(void);
 170 void movemouse(Client *c);
 171 Client *nexttiled(Client *c, View *v);
 172 void propertynotify(XEvent *e);
 173 void quit(const char *arg);
 174 void reapply(const char *arg);
 175 void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 176 void resizemouse(Client *c);
 177 void restack(View *v);
 178 void run(void);
 179 void scan(void);
 180 void setclientstate(Client *c, long state);
 181 void setlayout(const char *arg);
 182 void setmwfact(const char *arg);
 183 void setup(void);
 184 void spawn(const char *arg);
 185 void tag(const char *arg);
 186 unsigned int textnw(const char *text, unsigned int len);
 187 unsigned int textw(const char *text);
 188 void tile(View *v);
 189 void togglebar(const char *arg);
 190 void togglefloating(const char *arg);
 191 void toggletag(const char *arg);
 192 void toggleview(const char *arg);
 193 void unban(Client *c);
 194 void unmanage(Client *c);
 195 void unmapnotify(XEvent *e);
 196 void updatebarpos(View *v);
 197 void updatesizehints(Client *c);
 198 void updatetitle(Client *c);
 199 void updatewmhints(Client *c);
 200 void view(const char *arg);
 201 void viewprevtag(const char *arg);      /* views previous selected tags */
 202 int xerror(Display *dpy, XErrorEvent *ee);
 203 int xerrordummy(Display *dpy, XErrorEvent *ee);
 204 int xerrorstart(Display *dpy, XErrorEvent *ee);
 205 void zoom(const char *arg);
 206 void selectview(const char *arg);
 207
 208 /* variables */
 209 char stext[256], buf[256];
 210 int nviews = 1;
 211 int screen;
 212 int (*xerrorxlib)(Display *, XErrorEvent *);
 213 unsigned int bh, bpos;
 214 unsigned int blw = 0;
 215 unsigned int numlockmask = 0;
 216 void (*handler[LASTEvent]) (XEvent *) = {
 217         [ButtonPress] = buttonpress,
 218         [ConfigureRequest] = configurerequest,
 219         [ConfigureNotify] = configurenotify,
 220         [DestroyNotify] = destroynotify,
 221         [EnterNotify] = enternotify,
 222         [Expose] = expose,
 223         [FocusIn] = focusin,
 224         [KeyPress] = keypress,
 225         [MappingNotify] = mappingnotify,
 226         [MapRequest] = maprequest,
 227         [PropertyNotify] = propertynotify,
 228         [UnmapNotify] = unmapnotify
 229 };
 230 Atom wmatom[WMLast], netatom[NetLast];
 231 Bool domwfact = True;
 232 Bool dozoom = True;
 233 Bool otherwm, readin;
 234 Bool running = True;
 235 Bool *prevtags;
 236 Bool *seltags;
 237 Client *clients = NULL;
 238 Client *sel = NULL;
 239 Client *stack = NULL;
 240 Cursor cursor[CurLast];
 241 Display *dpy;
 242 DC dc = {0};
 243 View *views;
 244 View *selview;
 245 Window root;
 246
 247 /* configuration, allows nested code to access above variables */
 248 #include "config.h"
 249 #define TAGSZ (LENGTH(tags) * sizeof(Bool))
 250
 251 /* function implementations */
 252
 253 void
 254 applyrules(Client *c) {
 255         unsigned int i, idx;
 256         Bool matched = False;
 257         Rule *r;
 258         XClassHint ch = { 0 };
 259
 260         /* rule matching */
 261         XGetClassHint(dpy, c->win, &ch);
 262         for(i = 0; i < LENGTH(rules); i++) {
 263                 r = &rules[i];
 264                 if(strstr(c->name, r->prop)
 265                 || (ch.res_class && strstr(ch.res_class, r->prop))
 266                 || (ch.res_name && strstr(ch.res_name, r->prop)))
 267                 {
 268                         c->isfloating = r->isfloating;
 269                         if(r->tag && !conflicts(c, (idx = idxoftag(r->tag)))) {
 270                                 c->tags[idx] = True;
 271                                 matched = True;
 272                         }
 273                 }
 274         }
 275         if(ch.res_class)
 276                 XFree(ch.res_class);
 277         if(ch.res_name)
 278                 XFree(ch.res_name);
 279         if(!matched) {
 280                 for(i = 0; i < LENGTH(tags); i++)
 281                         if(seltags[i] && vtags[i] == selview->id)
 282                                 c->tags[i] = True;
 283         }
 284 }
 285
 286 void
 287 arrange(void) {
 288         unsigned int i;
 289         Client *c;
 290
 291         for(c = clients; c; c = c->next)
 292                 if(isvisible(c))
 293                         unban(c);
 294                 else
 295                         ban(c);
 296
 297         focus(NULL);
 298         for(i = 0; i < nviews; i++) {
 299                 views[i].layout->arrange(&views[i]);
 300                 restack(&views[i]);
 301         }
 302 }
 303
 304 void
 305 attach(Client *c) {
 306         if(clients)
 307                 clients->prev = c;
 308         c->next = clients;
 309         clients = c;
 310 }
 311
 312 void
 313 attachstack(Client *c) {
 314         c->snext = stack;
 315         stack = c;
 316 }
 317
 318 void
 319 ban(Client *c) {
 320         if(c->isbanned)
 321                 return;
 322         XMoveWindow(dpy, c->win, c->x + 3 * getview(c)->w, c->y);
 323         c->isbanned = True;
 324 }
 325
 326 void
 327 buttonpress(XEvent *e) {
 328         unsigned int i, x;
 329         Client *c;
 330         XButtonPressedEvent *ev = &e->xbutton;
 331
 332         if(ev->window == selview->barwin) {
 333                 x = 0;
 334                 for(i = 0; i < LENGTH(tags); i++) {
 335                         if(&views[vtags[i]] != selview)
 336                                 continue;
 337                         x += textw(tags[i]);
 338                         if(ev->x < x) {
 339                                 if(ev->button == Button1) {
 340                                         if(ev->state & MODKEY)
 341                                                 tag(tags[i]);
 342                                         else
 343                                                 view(tags[i]);
 344                                 }
 345                                 else if(ev->button == Button3) {
 346                                         if(ev->state & MODKEY)
 347                                                 toggletag(tags[i]);
 348                                         else
 349                                                 toggleview(tags[i]);
 350                                 }
 351                                 return;
 352                         }
 353                 }
 354                 if((ev->x < x + blw) && ev->button == Button1)
 355                         setlayout(NULL);
 356         }
 357         else if((c = getclient(ev->window))) {
 358                 focus(c);
 359                 if(CLEANMASK(ev->state) != MODKEY)
 360                         return;
 361                 if(ev->button == Button1) {
 362                         restack(getview(c));
 363                         movemouse(c);
 364                 }
 365                 else if(ev->button == Button2) {
 366                         if((floating != getview(c)->layout->arrange) && c->isfloating)
 367                                 togglefloating(NULL);
 368                         else
 369                                 zoom(NULL);
 370                 }
 371                 else if(ev->button == Button3 && !c->isfixed) {
 372                         restack(getview(c));
 373                         resizemouse(c);
 374                 }
 375         }
 376 }
 377
 378 void
 379 checkotherwm(void) {
 380         otherwm = False;
 381         XSetErrorHandler(xerrorstart);
 382
 383         /* this causes an error if some other window manager is running */
 384         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 385         XSync(dpy, False);
 386         if(otherwm)
 387                 eprint("dwm: another window manager is already running\n");
 388         XSync(dpy, False);
 389         XSetErrorHandler(NULL);
 390         xerrorxlib = XSetErrorHandler(xerror);
 391         XSync(dpy, False);
 392 }
 393
 394 void
 395 cleanup(void) {
 396         unsigned int i;
 397
 398         close(STDIN_FILENO);
 399         while(stack) {
 400                 unban(stack);
 401                 unmanage(stack);
 402         }
 403         if(dc.font.set)
 404                 XFreeFontSet(dpy, dc.font.set);
 405         else
 406                 XFreeFont(dpy, dc.font.xfont);
 407
 408         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 409         XFreePixmap(dpy, dc.drawable);
 410         XFreeGC(dpy, dc.gc);
 411         XFreeCursor(dpy, cursor[CurNormal]);
 412         XFreeCursor(dpy, cursor[CurResize]);
 413         XFreeCursor(dpy, cursor[CurMove]);
 414         for(i = 0; i < nviews; i++)
 415                 XDestroyWindow(dpy, views[i].barwin);
 416         XSync(dpy, False);
 417         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 418 }
 419
 420 void
 421 configure(Client *c) {
 422         XConfigureEvent ce;
 423
 424         ce.type = ConfigureNotify;
 425         ce.display = dpy;
 426         ce.event = c->win;
 427         ce.window = c->win;
 428         ce.x = c->x;
 429         ce.y = c->y;
 430         ce.width = c->w;
 431         ce.height = c->h;
 432         ce.border_width = c->border;
 433         ce.above = None;
 434         ce.override_redirect = False;
 435         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 436 }
 437
 438 void
 439 configurenotify(XEvent *e) {
 440         XConfigureEvent *ev = &e->xconfigure;
 441         View *v = selview;
 442
 443         if(ev->window == root && (ev->width != v->w || ev->height != v->h)) {
 444                 /* TODO -- update Xinerama dimensions here */
 445                 v->w = ev->width;
 446                 v->h = ev->height;
 447                 XFreePixmap(dpy, dc.drawable);
 448                 dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(root, screen), bh, DefaultDepth(dpy, screen));
 449                 XResizeWindow(dpy, v->barwin, v->w, bh);
 450                 updatebarpos(selview);
 451                 arrange();
 452         }
 453 }
 454
 455 void
 456 configurerequest(XEvent *e) {
 457         Client *c;
 458         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 459         XWindowChanges wc;
 460
 461         if((c = getclient(ev->window))) {
 462                 View *v = getview(c);
 463                 if(ev->value_mask & CWBorderWidth)
 464                         c->border = ev->border_width;
 465                 if(c->isfixed || c->isfloating || (floating == v->layout->arrange)) {
 466                         if(ev->value_mask & CWX)
 467                                 c->x = v->x + ev->x;
 468                         if(ev->value_mask & CWY)
 469                                 c->y = v->y + ev->y;
 470                         if(ev->value_mask & CWWidth)
 471                                 c->w = ev->width;
 472                         if(ev->value_mask & CWHeight)
 473                                 c->h = ev->height;
 474                         if((c->x - v->x + c->w) > v->w && c->isfloating)
 475                                 c->x = v->x + (v->w / 2 - c->w / 2); /* center in x direction */
 476                         if((c->y - v->y + c->h) > v->h && c->isfloating)
 477                                 c->y = v->y + (v->h / 2 - c->h / 2); /* center in y direction */
 478                         if((ev->value_mask & (CWX|CWY))
 479                         && !(ev->value_mask & (CWWidth|CWHeight)))
 480                                 configure(c);
 481                         if(isvisible(c))
 482                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 483                 }
 484                 else
 485                         configure(c);
 486         }
 487         else {
 488                 wc.x = ev->x;
 489                 wc.y = ev->y;
 490                 wc.width = ev->width;
 491                 wc.height = ev->height;
 492                 wc.border_width = ev->border_width;
 493                 wc.sibling = ev->above;
 494                 wc.stack_mode = ev->detail;
 495                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 496         }
 497         XSync(dpy, False);
 498 }
 499
 500 Bool
 501 conflicts(Client *c, unsigned int tidx) {
 502         unsigned int i;
 503
 504         for(i = 0; i < LENGTH(tags); i++)
 505                 if(c->tags[i] && vtags[i] != vtags[tidx])
 506                         return True; /* conflict */
 507         return False;
 508 }
 509
 510 void
 511 destroynotify(XEvent *e) {
 512         Client *c;
 513         XDestroyWindowEvent *ev = &e->xdestroywindow;
 514
 515         if((c = getclient(ev->window)))
 516                 unmanage(c);
 517 }
 518
 519 void
 520 detach(Client *c) {
 521         if(c->prev)
 522                 c->prev->next = c->next;
 523         if(c->next)
 524                 c->next->prev = c->prev;
 525         if(c == clients)
 526                 clients = c->next;
 527         c->next = c->prev = NULL;
 528 }
 529
 530 void
 531 detachstack(Client *c) {
 532         Client **tc;
 533
 534         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 535         *tc = c->snext;
 536 }
 537
 538 void
 539 drawbar(View *v) {
 540         int i, x;
 541         Client *c;
 542
 543         dc.x = 0;
 544         for(c = stack; c && (!isvisible(c) || getview(c) != v); c = c->snext);
 545         for(i = 0; i < LENGTH(tags); i++) {
 546                 if(&views[vtags[i]] != v)
 547                         continue;
 548                 dc.w = textw(tags[i]);
 549                 if(seltags[i]) {
 550                         drawtext(tags[i], dc.sel, isurgent(i));
 551                         drawsquare(c && c->tags[i], isoccupied(i), isurgent(i), dc.sel);
 552                 }
 553                 else {
 554                         drawtext(tags[i], dc.norm, isurgent(i));
 555                         drawsquare(c && c->tags[i], isoccupied(i), isurgent(i), dc.norm);
 556                 }
 557                 dc.x += dc.w;
 558         }
 559         dc.w = blw;
 560         drawtext(v->layout->symbol, dc.norm, False);
 561         x = dc.x + dc.w;
 562         if(v == selview) {
 563                 dc.w = textw(stext);
 564                 dc.x = v->w - dc.w;
 565                 if(dc.x < x) {
 566                         dc.x = x;
 567                         dc.w = v->w - x;
 568                 }
 569                 drawtext(stext, dc.norm, False);
 570         }
 571         else
 572                 dc.x = v->w;
 573         if((dc.w = dc.x - x) > bh) {
 574                 dc.x = x;
 575                 if(c) {
 576                         drawtext(c->name, dc.sel, False);
 577                         drawsquare(False, c->isfloating, False, dc.sel);
 578                 }
 579                 else
 580                         drawtext(NULL, dc.norm, False);
 581         }
 582         XCopyArea(dpy, dc.drawable, v->barwin, dc.gc, 0, 0, v->w, bh, 0, 0);
 583         XSync(dpy, False);
 584 }
 585
 586 void
 587 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 588         int x;
 589         XGCValues gcv;
 590         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 591
 592         gcv.foreground = col[invert ? ColBG : ColFG];
 593         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 594         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 595         r.x = dc.x + 1;
 596         r.y = dc.y + 1;
 597         if(filled) {
 598                 r.width = r.height = x + 1;
 599                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 600         }
 601         else if(empty) {
 602                 r.width = r.height = x;
 603                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 604         }
 605 }
 606
 607 void
 608 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 609         int x, y, w, h;
 610         unsigned int len, olen;
 611         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 612
 613         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 614         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 615         if(!text)
 616                 return;
 617         w = 0;
 618         olen = len = strlen(text);
 619         if(len >= sizeof buf)
 620                 len = sizeof buf - 1;
 621         memcpy(buf, text, len);
 622         buf[len] = 0;
 623         h = dc.font.ascent + dc.font.descent;
 624         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 625         x = dc.x + (h / 2);
 626         /* shorten text if necessary */
 627         while(len && (w = textnw(buf, len)) > dc.w - h)
 628                 buf[--len] = 0;
 629         if(len < olen) {
 630                 if(len > 1)
 631                         buf[len - 1] = '.';
 632                 if(len > 2)
 633                         buf[len - 2] = '.';
 634                 if(len > 3)
 635                         buf[len - 3] = '.';
 636         }
 637         if(w > dc.w)
 638                 return; /* too long */
 639         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 640         if(dc.font.set)
 641                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 642         else
 643                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 644 }
 645
 646 void *
 647 emallocz(unsigned int size) {
 648         void *res = calloc(1, size);
 649
 650         if(!res)
 651                 eprint("fatal: could not malloc() %u bytes\n", size);
 652         return res;
 653 }
 654
 655 void
 656 enternotify(XEvent *e) {
 657         Client *c;
 658         XCrossingEvent *ev = &e->xcrossing;
 659
 660         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 661                 return;
 662         if((c = getclient(ev->window)))
 663                 focus(c);
 664         else
 665                 focus(NULL);
 666 }
 667
 668 void
 669 eprint(const char *errstr, ...) {
 670         va_list ap;
 671
 672         va_start(ap, errstr);
 673         vfprintf(stderr, errstr, ap);
 674         va_end(ap);
 675         exit(EXIT_FAILURE);
 676 }
 677
 678 void
 679 expose(XEvent *e) {
 680         View *v;
 681         XExposeEvent *ev = &e->xexpose;
 682
 683         if(ev->count == 0 && ((v = getviewbar(ev->window))))
 684                 drawbar(v);
 685 }
 686
 687 unsigned int
 688 firstag(View *v) {
 689         unsigned int i;
 690
 691         for(i = 0; i < LENGTH(tags); i++)
 692                 if(vtags[i] == v->id)
 693                         return i;
 694         return 0; /* safe fallback */
 695 }
 696
 697 void
 698 floating(View *v) { /* default floating layout */
 699         Client *c;
 700
 701         domwfact = dozoom = False;
 702         for(c = clients; c; c = c->next)
 703                 if(isvisible(c))
 704                         resize(c, c->x, c->y, c->w, c->h, True);
 705 }
 706
 707 void
 708 focus(Client *c) {
 709         View *v = selview;
 710
 711         if(c)
 712                 selview = getview(c);
 713         if(selview != v)
 714                 drawbar(v);
 715         if(!c || (c && !isvisible(c)))
 716                 /* TODO: isvisible might take getview(c) as constraint? */
 717                 for(c = stack; c && (!isvisible(c) || getview(c) != selview); c = c->snext);
 718         if(sel && sel != c) {
 719                 grabbuttons(sel, False);
 720                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 721         }
 722         if(c) {
 723                 detachstack(c);
 724                 attachstack(c);
 725                 grabbuttons(c, True);
 726         }
 727         sel = c;
 728         if(c) {
 729                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 730                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 731                 selview = getview(c);
 732         }
 733         else
 734                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 735         drawbar(selview);
 736 }
 737
 738 void
 739 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 740         XFocusChangeEvent *ev = &e->xfocus;
 741
 742         if(sel && ev->window != sel->win)
 743                 XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 744 }
 745
 746 void
 747 focusnext(const char *arg) {
 748         Client *c;
 749
 750         if(!sel)
 751                 return;
 752         for(c = sel->next; c && !isvisible(c); c = c->next);
 753         if(!c)
 754                 for(c = clients; c && !isvisible(c); c = c->next);
 755         if(c) {
 756                 focus(c);
 757                 restack(getview(c));
 758         }
 759 }
 760
 761 void
 762 focusprev(const char *arg) {
 763         Client *c;
 764
 765         if(!sel)
 766                 return;
 767         for(c = sel->prev; c && !isvisible(c); c = c->prev);
 768         if(!c) {
 769                 for(c = clients; c && c->next; c = c->next);
 770                 for(; c && !isvisible(c); c = c->prev);
 771         }
 772         if(c) {
 773                 focus(c);
 774                 restack(getview(c));
 775         }
 776 }
 777
 778 Client *
 779 getclient(Window w) {
 780         Client *c;
 781
 782         for(c = clients; c && c->win != w; c = c->next);
 783         return c;
 784 }
 785
 786 unsigned long
 787 getcolor(const char *colstr) {
 788         Colormap cmap = DefaultColormap(dpy, screen);
 789         XColor color;
 790
 791         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 792                 eprint("error, cannot allocate color '%s'\n", colstr);
 793         return color.pixel;
 794 }
 795
 796 View *
 797 getview(Client *c) {
 798         unsigned int i;
 799
 800         for(i = 0; i < LENGTH(tags); i++)
 801                 if(c->tags[i])
 802                         return &views[vtags[i]];
 803         return NULL;
 804 }
 805
 806 View *
 807 getviewbar(Window barwin) {
 808         unsigned int i;
 809
 810         for(i = 0; i < nviews; i++)
 811                 if(views[i].barwin == barwin)
 812                         return &views[i];
 813         return NULL;
 814 }
 815
 816 long
 817 getstate(Window w) {
 818         int format, status;
 819         long result = -1;
 820         unsigned char *p = NULL;
 821         unsigned long n, extra;
 822         Atom real;
 823
 824         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 825                         &real, &format, &n, &extra, (unsigned char **)&p);
 826         if(status != Success)
 827                 return -1;
 828         if(n != 0)
 829                 result = *p;
 830         XFree(p);
 831         return result;
 832 }
 833
 834 Bool
 835 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 836         char **list = NULL;
 837         int n;
 838         XTextProperty name;
 839
 840         if(!text || size == 0)
 841                 return False;
 842         text[0] = '\0';
 843         XGetTextProperty(dpy, w, &name, atom);
 844         if(!name.nitems)
 845                 return False;
 846         if(name.encoding == XA_STRING)
 847                 strncpy(text, (char *)name.value, size - 1);
 848         else {
 849                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 850                 && n > 0 && *list) {
 851                         strncpy(text, *list, size - 1);
 852                         XFreeStringList(list);
 853                 }
 854         }
 855         text[size - 1] = '\0';
 856         XFree(name.value);
 857         return True;
 858 }
 859
 860 void
 861 grabbuttons(Client *c, Bool focused) {
 862         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 863
 864         if(focused) {
 865                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 866                                 GrabModeAsync, GrabModeSync, None, None);
 867                 XGrabButton(dpy, Button1, MODKEY|LockMask, c->win, False, BUTTONMASK,
 868                                 GrabModeAsync, GrabModeSync, None, None);
 869                 XGrabButton(dpy, Button1, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 870                                 GrabModeAsync, GrabModeSync, None, None);
 871                 XGrabButton(dpy, Button1, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 872                                 GrabModeAsync, GrabModeSync, None, None);
 873
 874                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 875                                 GrabModeAsync, GrabModeSync, None, None);
 876                 XGrabButton(dpy, Button2, MODKEY|LockMask, c->win, False, BUTTONMASK,
 877                                 GrabModeAsync, GrabModeSync, None, None);
 878                 XGrabButton(dpy, Button2, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 879                                 GrabModeAsync, GrabModeSync, None, None);
 880                 XGrabButton(dpy, Button2, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 881                                 GrabModeAsync, GrabModeSync, None, None);
 882
 883                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 884                                 GrabModeAsync, GrabModeSync, None, None);
 885                 XGrabButton(dpy, Button3, MODKEY|LockMask, c->win, False, BUTTONMASK,
 886                                 GrabModeAsync, GrabModeSync, None, None);
 887                 XGrabButton(dpy, Button3, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 888                                 GrabModeAsync, GrabModeSync, None, None);
 889                 XGrabButton(dpy, Button3, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 890                                 GrabModeAsync, GrabModeSync, None, None);
 891         }
 892         else
 893                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 894                                 GrabModeAsync, GrabModeSync, None, None);
 895 }
 896
 897 void
 898 grabkeys(void)  {
 899         unsigned int i, j;
 900         KeyCode code;
 901         XModifierKeymap *modmap;
 902
 903         /* init modifier map */
 904         modmap = XGetModifierMapping(dpy);
 905         for(i = 0; i < 8; i++)
 906                 for(j = 0; j < modmap->max_keypermod; j++) {
 907                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 908                                 numlockmask = (1 << i);
 909                 }
 910         XFreeModifiermap(modmap);
 911
 912         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 913         for(i = 0; i < LENGTH(keys); i++) {
 914                 code = XKeysymToKeycode(dpy, keys[i].keysym);
 915                 XGrabKey(dpy, code, keys[i].mod, root, True,
 916                                 GrabModeAsync, GrabModeAsync);
 917                 XGrabKey(dpy, code, keys[i].mod|LockMask, root, True,
 918                                 GrabModeAsync, GrabModeAsync);
 919                 XGrabKey(dpy, code, keys[i].mod|numlockmask, root, True,
 920                                 GrabModeAsync, GrabModeAsync);
 921                 XGrabKey(dpy, code, keys[i].mod|numlockmask|LockMask, root, True,
 922                                 GrabModeAsync, GrabModeAsync);
 923         }
 924 }
 925
 926 unsigned int
 927 idxoftag(const char *t) {
 928         unsigned int i;
 929
 930         for(i = 0; (i < LENGTH(tags)) && (tags[i] != t); i++);
 931         return (i < LENGTH(tags)) ? i : firstag(selview);
 932 }
 933
 934 void
 935 initfont(const char *fontstr) {
 936         char *def, **missing;
 937         int i, n;
 938
 939         missing = NULL;
 940         if(dc.font.set)
 941                 XFreeFontSet(dpy, dc.font.set);
 942         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 943         if(missing) {
 944                 while(n--)
 945                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 946                 XFreeStringList(missing);
 947         }
 948         if(dc.font.set) {
 949                 XFontSetExtents *font_extents;
 950                 XFontStruct **xfonts;
 951                 char **font_names;
 952                 dc.font.ascent = dc.font.descent = 0;
 953                 font_extents = XExtentsOfFontSet(dc.font.set);
 954                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 955                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 956                         if(dc.font.ascent < (*xfonts)->ascent)
 957                                 dc.font.ascent = (*xfonts)->ascent;
 958                         if(dc.font.descent < (*xfonts)->descent)
 959                                 dc.font.descent = (*xfonts)->descent;
 960                         xfonts++;
 961                 }
 962         }
 963         else {
 964                 if(dc.font.xfont)
 965                         XFreeFont(dpy, dc.font.xfont);
 966                 dc.font.xfont = NULL;
 967                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 968                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 969                         eprint("error, cannot load font: '%s'\n", fontstr);
 970                 dc.font.ascent = dc.font.xfont->ascent;
 971                 dc.font.descent = dc.font.xfont->descent;
 972         }
 973         dc.font.height = dc.font.ascent + dc.font.descent;
 974 }
 975
 976 Bool
 977 isoccupied(unsigned int t) {
 978         Client *c;
 979
 980         for(c = clients; c; c = c->next)
 981                 if(c->tags[t])
 982                         return True;
 983         return False;
 984 }
 985
 986 Bool
 987 isprotodel(Client *c) {
 988         int i, n;
 989         Atom *protocols;
 990         Bool ret = False;
 991
 992         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 993                 for(i = 0; !ret && i < n; i++)
 994                         if(protocols[i] == wmatom[WMDelete])
 995                                 ret = True;
 996                 XFree(protocols);
 997         }
 998         return ret;
 999 }
1000
1001 Bool
1002 isurgent(unsigned int t) {
1003         Client *c;
1004
1005         for(c = clients; c; c = c->next)
1006                 if(c->isurgent && c->tags[t])
1007                         return True;
1008         return False;
1009 }
1010
1011 Bool
1012 isvisible(Client *c) {
1013         unsigned int i;
1014
1015         for(i = 0; i < LENGTH(tags); i++)
1016                 if(c->tags[i] && seltags[i])
1017                         return True;
1018         return False;
1019 }
1020
1021 void
1022 keypress(XEvent *e) {
1023         unsigned int i;
1024         KeySym keysym;
1025         XKeyEvent *ev;
1026
1027         ev = &e->xkey;
1028         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1029         for(i = 0; i < LENGTH(keys); i++)
1030                 if(keysym == keys[i].keysym
1031                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
1032                 {
1033                         if(keys[i].func)
1034                                 keys[i].func(keys[i].arg);
1035                 }
1036 }
1037
1038 void
1039 killclient(const char *arg) {
1040         XEvent ev;
1041
1042         if(!sel)
1043                 return;
1044         if(isprotodel(sel)) {
1045                 ev.type = ClientMessage;
1046                 ev.xclient.window = sel->win;
1047                 ev.xclient.message_type = wmatom[WMProtocols];
1048                 ev.xclient.format = 32;
1049                 ev.xclient.data.l[0] = wmatom[WMDelete];
1050                 ev.xclient.data.l[1] = CurrentTime;
1051                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
1052         }
1053         else
1054                 XKillClient(dpy, sel->win);
1055 }
1056
1057 void
1058 manage(Window w, XWindowAttributes *wa) {
1059         Client *c, *t = NULL;
1060         View *v;
1061         Status rettrans;
1062         Window trans;
1063         XWindowChanges wc;
1064
1065         c = emallocz(sizeof(Client));
1066         c->tags = emallocz(TAGSZ);
1067         c->win = w;
1068
1069         applyrules(c);
1070
1071         v = getview(c);
1072
1073         c->x = wa->x + v->x;
1074         c->y = wa->y + v->y;
1075         c->w = wa->width;
1076         c->h = wa->height;
1077         c->oldborder = wa->border_width;
1078
1079         if(c->w == v->w && c->h == v->h) {
1080                 c->x = v->x;
1081                 c->y = v->y;
1082                 c->border = wa->border_width;
1083         }
1084         else {
1085                 if(c->x + c->w + 2 * c->border > v->wax + v->waw)
1086                         c->x = v->wax + v->waw - c->w - 2 * c->border;
1087                 if(c->y + c->h + 2 * c->border > v->way + v->wah)
1088                         c->y = v->way + v->wah - c->h - 2 * c->border;
1089                 if(c->x < v->wax)
1090                         c->x = v->wax;
1091                 if(c->y < v->way)
1092                         c->y = v->way;
1093                 c->border = BORDERPX;
1094         }
1095         wc.border_width = c->border;
1096         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1097         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1098         configure(c); /* propagates border_width, if size doesn't change */
1099         updatesizehints(c);
1100         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1101         grabbuttons(c, False);
1102         updatetitle(c);
1103         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1104                 for(t = clients; t && t->win != trans; t = t->next);
1105         if(t)
1106                 memcpy(c->tags, t->tags, TAGSZ);
1107         if(!c->isfloating)
1108                 c->isfloating = (rettrans == Success) || c->isfixed;
1109         attach(c);
1110         attachstack(c);
1111         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1112         ban(c);
1113         XMapWindow(dpy, c->win);
1114         setclientstate(c, NormalState);
1115         arrange();
1116 }
1117
1118 void
1119 mappingnotify(XEvent *e) {
1120         XMappingEvent *ev = &e->xmapping;
1121
1122         XRefreshKeyboardMapping(ev);
1123         if(ev->request == MappingKeyboard)
1124                 grabkeys();
1125 }
1126
1127 void
1128 maprequest(XEvent *e) {
1129         static XWindowAttributes wa;
1130         XMapRequestEvent *ev = &e->xmaprequest;
1131
1132         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1133                 return;
1134         if(wa.override_redirect)
1135                 return;
1136         if(!getclient(ev->window))
1137                 manage(ev->window, &wa);
1138 }
1139
1140 void
1141 movemouse(Client *c) {
1142         int x1, y1, ocx, ocy, di, nx, ny;
1143         unsigned int dui;
1144         View *v;
1145         Window dummy;
1146         XEvent ev;
1147
1148         ocx = nx = c->x;
1149         ocy = ny = c->y;
1150         v = getview(c);
1151         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1152                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1153                 return;
1154         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1155         for(;;) {
1156                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1157                 switch (ev.type) {
1158                 case ButtonRelease:
1159                         XUngrabPointer(dpy, CurrentTime);
1160                         return;
1161                 case ConfigureRequest:
1162                 case Expose:
1163                 case MapRequest:
1164                         handler[ev.type](&ev);
1165                         break;
1166                 case MotionNotify:
1167                         XSync(dpy, False);
1168                         nx = ocx + (ev.xmotion.x - x1);
1169                         ny = ocy + (ev.xmotion.y - y1);
1170                         if(abs(v->wax - nx) < SNAP)
1171                                 nx = v->wax;
1172                         else if(abs((v->wax + v->waw) - (nx + c->w + 2 * c->border)) < SNAP)
1173                                 nx = v->wax + v->waw - c->w - 2 * c->border;
1174                         if(abs(v->way - ny) < SNAP)
1175                                 ny = v->way;
1176                         else if(abs((v->way + v->wah) - (ny + c->h + 2 * c->border)) < SNAP)
1177                                 ny = v->way + v->wah - c->h - 2 * c->border;
1178                         if(!c->isfloating && (v->layout->arrange != floating) && (abs(nx - c->x) > SNAP || abs(ny - c->y) > SNAP))
1179                                 togglefloating(NULL);
1180                         if((v->layout->arrange == floating) || c->isfloating)
1181                                 resize(c, nx, ny, c->w, c->h, False);
1182                         break;
1183                 }
1184         }
1185 }
1186
1187 Client *
1188 nexttiled(Client *c, View *v) {
1189         for(; c && (c->isfloating || getview(c) != v || !isvisible(c)); c = c->next);
1190         return c;
1191 }
1192
1193 void
1194 propertynotify(XEvent *e) {
1195         Client *c;
1196         Window trans;
1197         XPropertyEvent *ev = &e->xproperty;
1198
1199         if(ev->state == PropertyDelete)
1200                 return; /* ignore */
1201         if((c = getclient(ev->window))) {
1202                 switch (ev->atom) {
1203                 default: break;
1204                 case XA_WM_TRANSIENT_FOR:
1205                         XGetTransientForHint(dpy, c->win, &trans);
1206                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1207                                 arrange();
1208                         break;
1209                 case XA_WM_NORMAL_HINTS:
1210                         updatesizehints(c);
1211                         break;
1212                 case XA_WM_HINTS:
1213                         updatewmhints(c);
1214                         drawbar(getview(c));
1215                         break;
1216                 }
1217                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1218                         updatetitle(c);
1219                         if(c == sel)
1220                                 drawbar(selview);
1221                 }
1222         }
1223 }
1224
1225 void
1226 quit(const char *arg) {
1227         readin = running = False;
1228 }
1229
1230 void
1231 reapply(const char *arg) {
1232         static Bool zerotags[LENGTH(tags)] = { 0 };
1233         Client *c;
1234
1235         for(c = clients; c; c = c->next) {
1236                 memcpy(c->tags, zerotags, sizeof zerotags);
1237                 applyrules(c);
1238         }
1239         arrange();
1240 }
1241
1242 void
1243 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1244         View *v;
1245         XWindowChanges wc;
1246
1247         v = getview(c);
1248         if(sizehints) {
1249                 /* set minimum possible */
1250                 if (w < 1)
1251                         w = 1;
1252                 if (h < 1)
1253                         h = 1;
1254
1255                 /* temporarily remove base dimensions */
1256                 w -= c->basew;
1257                 h -= c->baseh;
1258
1259                 /* adjust for aspect limits */
1260                 if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1261                         if (w * c->maxay > h * c->maxax)
1262                                 w = h * c->maxax / c->maxay;
1263                         else if (w * c->minay < h * c->minax)
1264                                 h = w * c->minay / c->minax;
1265                 }
1266
1267                 /* adjust for increment value */
1268                 if(c->incw)
1269                         w -= w % c->incw;
1270                 if(c->inch)
1271                         h -= h % c->inch;
1272
1273                 /* restore base dimensions */
1274                 w += c->basew;
1275                 h += c->baseh;
1276
1277                 if(c->minw > 0 && w < c->minw)
1278                         w = c->minw;
1279                 if(c->minh > 0 && h < c->minh)
1280                         h = c->minh;
1281                 if(c->maxw > 0 && w > c->maxw)
1282                         w = c->maxw;
1283                 if(c->maxh > 0 && h > c->maxh)
1284                         h = c->maxh;
1285         }
1286         if(w <= 0 || h <= 0)
1287                 return;
1288         if(x > v->x + v->w)
1289                 x = v->w - w - 2 * c->border;
1290         if(y > v->y + v->h)
1291                 y = v->h - h - 2 * c->border;
1292         if(x + w + 2 * c->border < v->x)
1293                 x = v->x;
1294         if(y + h + 2 * c->border < v->y)
1295                 y = v->y;
1296         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1297                 c->x = wc.x = x;
1298                 c->y = wc.y = y;
1299                 c->w = wc.width = w;
1300                 c->h = wc.height = h;
1301                 wc.border_width = c->border;
1302                 XConfigureWindow(dpy, c->win,
1303                                 CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1304                 configure(c);
1305                 XSync(dpy, False);
1306         }
1307 }
1308
1309 void
1310 resizemouse(Client *c) {
1311         int ocx, ocy;
1312         int nw, nh;
1313         View *v;
1314         XEvent ev;
1315
1316         ocx = c->x;
1317         ocy = c->y;
1318         v = getview(c);
1319         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1320                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1321                 return;
1322         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1323         for(;;) {
1324                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask , &ev);
1325                 switch(ev.type) {
1326                 case ButtonRelease:
1327                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1328                                         c->w + c->border - 1, c->h + c->border - 1);
1329                         XUngrabPointer(dpy, CurrentTime);
1330                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1331                         return;
1332                 case ConfigureRequest:
1333                 case Expose:
1334                 case MapRequest:
1335                         handler[ev.type](&ev);
1336                         break;
1337                 case MotionNotify:
1338                         XSync(dpy, False);
1339                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1340                                 nw = 1;
1341                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1342                                 nh = 1;
1343                         if(!c->isfloating && (v->layout->arrange != floating) && (abs(nw - c->w) > SNAP || abs(nh - c->h) > SNAP))
1344                                 togglefloating(NULL);
1345                         if((v->layout->arrange == floating) || c->isfloating)
1346                                 resize(c, c->x, c->y, nw, nh, True);
1347                         break;
1348                 }
1349         }
1350 }
1351
1352 void
1353 restack(View *v) {
1354         Client *c;
1355         XEvent ev;
1356         XWindowChanges wc;
1357
1358         drawbar(v);
1359         if(!sel)
1360                 return;
1361         if(sel->isfloating || (v->layout->arrange == floating))
1362                 XRaiseWindow(dpy, sel->win);
1363         if(v->layout->arrange != floating) {
1364                 wc.stack_mode = Below;
1365                 wc.sibling = v->barwin;
1366                 if(!sel->isfloating) {
1367                         XConfigureWindow(dpy, sel->win, CWSibling|CWStackMode, &wc);
1368                         wc.sibling = sel->win;
1369                 }
1370                 for(c = nexttiled(clients, v); c; c = nexttiled(c->next, v)) {
1371                         if(c == sel)
1372                                 continue;
1373                         XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1374                         wc.sibling = c->win;
1375                 }
1376         }
1377         XSync(dpy, False);
1378         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1379 }
1380
1381 void
1382 run(void) {
1383         char *p;
1384         char sbuf[sizeof stext];
1385         fd_set rd;
1386         int r, xfd;
1387         unsigned int len, offset;
1388         XEvent ev;
1389
1390         /* main event loop, also reads status text from stdin */
1391         XSync(dpy, False);
1392         xfd = ConnectionNumber(dpy);
1393         readin = True;
1394         offset = 0;
1395         len = sizeof stext - 1;
1396         sbuf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
1397         while(running) {
1398                 FD_ZERO(&rd);
1399                 if(readin)
1400                         FD_SET(STDIN_FILENO, &rd);
1401                 FD_SET(xfd, &rd);
1402                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1403                         if(errno == EINTR)
1404                                 continue;
1405                         eprint("select failed\n");
1406                 }
1407                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1408                         switch((r = read(STDIN_FILENO, sbuf + offset, len - offset))) {
1409                         case -1:
1410                                 strncpy(stext, strerror(errno), len);
1411                                 readin = False;
1412                                 break;
1413                         case 0:
1414                                 strncpy(stext, "EOF", 4);
1415                                 readin = False;
1416                                 break;
1417                         default:
1418                                 for(p = sbuf + offset; r > 0; p++, r--, offset++)
1419                                         if(*p == '\n' || *p == '\0') {
1420                                                 *p = '\0';
1421                                                 strncpy(stext, sbuf, len);
1422                                                 p += r - 1; /* p is sbuf + offset + r - 1 */
1423                                                 for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
1424                                                 offset = r;
1425                                                 if(r)
1426                                                         memmove(sbuf, p - r + 1, r);
1427                                                 break;
1428                                         }
1429                                 break;
1430                         }
1431                         drawbar(selview);
1432                 }
1433                 while(XPending(dpy)) {
1434                         XNextEvent(dpy, &ev);
1435                         if(handler[ev.type])
1436                                 (handler[ev.type])(&ev); /* call handler */
1437                 }
1438         }
1439 }
1440
1441 void
1442 scan(void) {
1443         unsigned int i, num;
1444         Window *wins, d1, d2;
1445         XWindowAttributes wa;
1446
1447         wins = NULL;
1448         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1449                 for(i = 0; i < num; i++) {
1450                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1451                                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1452                                 continue;
1453                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1454                                 manage(wins[i], &wa);
1455                 }
1456                 for(i = 0; i < num; i++) { /* now the transients */
1457                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1458                                 continue;
1459                         if(XGetTransientForHint(dpy, wins[i], &d1)
1460                                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1461                                 manage(wins[i], &wa);
1462                 }
1463         }
1464         if(wins)
1465                 XFree(wins);
1466 }
1467
1468 void
1469 setclientstate(Client *c, long state) {
1470         long data[] = {state, None};
1471
1472         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1473                         PropModeReplace, (unsigned char *)data, 2);
1474 }
1475
1476 void
1477 setlayout(const char *arg) {
1478         unsigned int i;
1479         View *v = selview;
1480
1481         if(!arg) {
1482                 v->layout++;
1483                 if(v->layout == &layouts[LENGTH(layouts)])
1484                         v->layout = &layouts[0];
1485         }
1486         else {
1487                 for(i = 0; i < LENGTH(layouts); i++)
1488                         if(!strcmp(arg, layouts[i].symbol))
1489                                 break;
1490                 if(i == LENGTH(layouts))
1491                         return;
1492                 v->layout = &layouts[i];
1493         }
1494         if(sel)
1495                 arrange();
1496         else
1497                 drawbar(selview);
1498 }
1499
1500 void
1501 setmwfact(const char *arg) {
1502         double delta;
1503         View *v = selview;
1504
1505         if(!domwfact)
1506                 return;
1507         /* arg handling, manipulate mwfact */
1508         if(arg == NULL)
1509                 v->mwfact = MWFACT;
1510         else if(sscanf(arg, "%lf", &delta) == 1) {
1511                 if(arg[0] == '+' || arg[0] == '-')
1512                         v->mwfact += delta;
1513                 else
1514                         v->mwfact = delta;
1515                 if(v->mwfact < 0.1)
1516                         v->mwfact = 0.1;
1517                 else if(v->mwfact > 0.9)
1518                         v->mwfact = 0.9;
1519         }
1520         arrange();
1521 }
1522
1523 void
1524 setup(void) {
1525         unsigned int i, j;
1526         View *v;
1527         XSetWindowAttributes wa;
1528         XineramaScreenInfo *info = NULL;
1529
1530         /* init atoms */
1531         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1532         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1533         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1534         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1535         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1536         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1537
1538         /* init cursors */
1539         wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1540         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1541         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1542
1543         if(XineramaIsActive(dpy))
1544                 info = XineramaQueryScreens(dpy, &nviews);
1545
1546 #if defined(AIM_XINERAMA)
1547 nviews = 2; /* aim Xinerama */
1548 #endif
1549         views = emallocz(nviews * sizeof(View));
1550
1551         screen = DefaultScreen(dpy);
1552         root = RootWindow(dpy, screen);
1553
1554         /* init appearance */
1555         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1556         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1557         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1558         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1559         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1560         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1561         initfont(FONT);
1562         dc.h = bh = dc.font.height + 2;
1563         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1564         dc.gc = XCreateGC(dpy, root, 0, 0);
1565         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1566         if(!dc.font.set)
1567                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1568
1569         for(blw = i = 0; i < LENGTH(layouts); i++) {
1570                 i = textw(layouts[i].symbol);
1571                 if(i > blw)
1572                         blw = i;
1573         }
1574
1575         seltags = emallocz(TAGSZ);
1576         prevtags = emallocz(TAGSZ);
1577
1578         /* check, if vtags need assistance, because there is only 1 view */
1579         if(nviews == 1)
1580                 for(i = 0; i < LENGTH(tags); i++)
1581                         vtags[i] = 0;
1582
1583         for(i = 0; i < nviews; i++) {
1584                 /* init geometry */
1585                 v = &views[i];
1586                 v->id = i;
1587
1588                 /* select first tag of view */
1589                 j = firstag(v);
1590                 seltags[j] = prevtags[j] = True;
1591
1592                 if(info) {
1593
1594 #if defined(AIM_XINERAMA)
1595 v->w = DisplayWidth(dpy, screen) / 2;
1596 v->x = (i == 0) ? 0 : v->w;
1597 v->y = 0;
1598 v->h = DisplayHeight(dpy, screen);
1599 #else
1600                         v->x = info[i].x_org;
1601                         v->y = info[i].y_org;
1602                         v->w = info[i].width;
1603                         v->h = info[i].height;
1604 #endif
1605                 }
1606                 else {
1607                         v->x = 0;
1608                         v->y = 0;
1609                         v->w = DisplayWidth(dpy, screen);
1610                         v->h = DisplayHeight(dpy, screen);
1611                 }
1612
1613                 /* init layouts */
1614                 v->mwfact = MWFACT;
1615                 v->layout = &layouts[0];
1616
1617                 // TODO: bpos per screen?
1618                 bpos = BARPOS;
1619                 wa.override_redirect = 1;
1620                 wa.background_pixmap = ParentRelative;
1621                 wa.event_mask = ButtonPressMask|ExposureMask;
1622
1623                 /* init bars */
1624                 v->barwin = XCreateWindow(dpy, root, v->x, v->y, v->w, bh, 0,
1625                                 DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1626                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1627                 XDefineCursor(dpy, v->barwin, cursor[CurNormal]);
1628                 updatebarpos(v);
1629                 XMapRaised(dpy, v->barwin);
1630                 strcpy(stext, "dwm-"VERSION);
1631
1632                 /* EWMH support per view */
1633                 XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1634                                 PropModeReplace, (unsigned char *) netatom, NetLast);
1635
1636                 /* select for events */
1637                 wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1638                                 |EnterWindowMask|LeaveWindowMask|StructureNotifyMask;
1639                 XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1640                 XSelectInput(dpy, root, wa.event_mask);
1641
1642                 drawbar(v);
1643         }
1644         if(info)
1645                 XFree(info);
1646
1647         selview = viewat();
1648
1649         /* grab keys */
1650         grabkeys();
1651 }
1652
1653 void
1654 spawn(const char *arg) {
1655         static char *shell = NULL;
1656
1657         if(!shell && !(shell = getenv("SHELL")))
1658                 shell = "/bin/sh";
1659         if(!arg)
1660                 return;
1661         /* The double-fork construct avoids zombie processes and keeps the code
1662          * clean from stupid signal handlers. */
1663         if(fork() == 0) {
1664                 if(fork() == 0) {
1665                         if(dpy)
1666                                 close(ConnectionNumber(dpy));
1667                         setsid();
1668                         execl(shell, shell, "-c", arg, (char *)NULL);
1669                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1670                         perror(" failed");
1671                 }
1672                 exit(0);
1673         }
1674         wait(0);
1675 }
1676
1677 void
1678 tag(const char *arg) {
1679         unsigned int i;
1680
1681         if(!sel)
1682                 return;
1683         for(i = 0; i < LENGTH(tags); i++)
1684                 sel->tags[i] = (NULL == arg) && (vtags[i] == getview(sel)->id);
1685         i = idxoftag(arg);
1686         if(!conflicts(sel, i))
1687                 sel->tags[idxoftag(arg)] = True;
1688         arrange();
1689 }
1690
1691 unsigned int
1692 textnw(const char *text, unsigned int len) {
1693         XRectangle r;
1694
1695         if(dc.font.set) {
1696                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1697                 return r.width;
1698         }
1699         return XTextWidth(dc.font.xfont, text, len);
1700 }
1701
1702 unsigned int
1703 textw(const char *text) {
1704         return textnw(text, strlen(text)) + dc.font.height;
1705 }
1706
1707 void
1708 tile(View *v) {
1709         unsigned int i, n, nx, ny, nw, nh, mw, th;
1710         Client *c, *mc;
1711
1712         domwfact = dozoom = True;
1713         nx = v->wax;
1714         ny = v->way;
1715         nw = 0;
1716         for(n = 0, c = nexttiled(clients, v); c; c = nexttiled(c->next, v))
1717                 n++;
1718
1719         /* window geoms */
1720         mw = (n == 1) ? v->waw : v->mwfact * v->waw;
1721         th = (n > 1) ? v->wah / (n - 1) : 0;
1722         if(n > 1 && th < bh)
1723                 th = v->wah;
1724
1725         for(i = 0, c = mc = nexttiled(clients, v); c; c = nexttiled(c->next, v)) {
1726                 if(i == 0) { /* master */
1727                         nw = mw - 2 * c->border;
1728                         nh = v->wah - 2 * c->border;
1729                 }
1730                 else {  /* tile window */
1731                         if(i == 1) {
1732                                 ny = v->way;
1733                                 nx += mc->w + 2 * mc->border;
1734                                 nw = v->waw - mw - 2 * c->border;
1735                         }
1736                         if(i + 1 == n) /* remainder */
1737                                 nh = (v->way + v->wah) - ny - 2 * c->border;
1738                         else
1739                                 nh = th - 2 * c->border;
1740                 }
1741                 resize(c, nx, ny, nw, nh, RESIZEHINTS);
1742                 if((RESIZEHINTS) && ((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw)))
1743                         /* client doesn't accept size constraints */
1744                         resize(c, nx, ny, nw, nh, False);
1745                 if(n > 1 && th != v->wah)
1746                         ny = c->y + c->h + 2 * c->border;
1747                 i++;
1748         }
1749 }
1750
1751 void
1752 togglebar(const char *arg) {
1753         if(bpos == BarOff)
1754                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1755         else
1756                 bpos = BarOff;
1757         updatebarpos(selview);
1758         arrange();
1759 }
1760
1761 void
1762 togglefloating(const char *arg) {
1763         if(!sel)
1764                 return;
1765         sel->isfloating = !sel->isfloating;
1766         if(sel->isfloating)
1767                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1768         arrange();
1769 }
1770
1771 void
1772 toggletag(const char *arg) {
1773         unsigned int i, j;
1774
1775         if(!sel)
1776                 return;
1777         i = idxoftag(arg);
1778         if(conflicts(sel, i))
1779                 return;
1780         sel->tags[i] = !sel->tags[i];
1781         for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
1782         if(j == LENGTH(tags))
1783                 sel->tags[i] = True; /* at least one tag must be enabled */
1784         arrange();
1785 }
1786
1787 void
1788 toggleview(const char *arg) {
1789         unsigned int i, j;
1790
1791         i = idxoftag(arg);
1792         seltags[i] = !seltags[i];
1793         for(j = 0; j < LENGTH(tags) && !seltags[j]; j++);
1794         if(j == LENGTH(tags))
1795                 seltags[i] = True; /* at least one tag must be viewed */
1796         arrange();
1797 }
1798
1799 void
1800 unban(Client *c) {
1801         if(!c->isbanned)
1802                 return;
1803         XMoveWindow(dpy, c->win, c->x, c->y);
1804         c->isbanned = False;
1805 }
1806
1807 void
1808 unmanage(Client *c) {
1809         XWindowChanges wc;
1810
1811         wc.border_width = c->oldborder;
1812         /* The server grab construct avoids race conditions. */
1813         XGrabServer(dpy);
1814         XSetErrorHandler(xerrordummy);
1815         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1816         detach(c);
1817         detachstack(c);
1818         if(sel == c)
1819                 focus(NULL);
1820         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1821         setclientstate(c, WithdrawnState);
1822         free(c->tags);
1823         free(c);
1824         XSync(dpy, False);
1825         XSetErrorHandler(xerror);
1826         XUngrabServer(dpy);
1827         arrange();
1828 }
1829
1830 void
1831 unmapnotify(XEvent *e) {
1832         Client *c;
1833         XUnmapEvent *ev = &e->xunmap;
1834
1835         if((c = getclient(ev->window)))
1836                 unmanage(c);
1837 }
1838
1839 void
1840 updatebarpos(View *v) {
1841         XEvent ev;
1842
1843         v->wax = v->x;
1844         v->way = v->y;
1845         v->wah = v->h;
1846         v->waw = v->w;
1847         switch(bpos) {
1848         default:
1849                 v->wah -= bh;
1850                 v->way += bh;
1851                 XMoveWindow(dpy, v->barwin, v->x, v->y);
1852                 break;
1853         case BarBot:
1854                 v->wah -= bh;
1855                 XMoveWindow(dpy, v->barwin, v->x, v->y + v->wah);
1856                 break;
1857         case BarOff:
1858                 XMoveWindow(dpy, v->barwin, v->x, v->y - bh);
1859                 break;
1860         }
1861         XSync(dpy, False);
1862         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1863 }
1864
1865 void
1866 updatesizehints(Client *c) {
1867         long msize;
1868         XSizeHints size;
1869
1870         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1871                 size.flags = PSize;
1872         c->flags = size.flags;
1873         if(c->flags & PBaseSize) {
1874                 c->basew = size.base_width;
1875                 c->baseh = size.base_height;
1876         }
1877         else if(c->flags & PMinSize) {
1878                 c->basew = size.min_width;
1879                 c->baseh = size.min_height;
1880         }
1881         else
1882                 c->basew = c->baseh = 0;
1883         if(c->flags & PResizeInc) {
1884                 c->incw = size.width_inc;
1885                 c->inch = size.height_inc;
1886         }
1887         else
1888                 c->incw = c->inch = 0;
1889         if(c->flags & PMaxSize) {
1890                 c->maxw = size.max_width;
1891                 c->maxh = size.max_height;
1892         }
1893         else
1894                 c->maxw = c->maxh = 0;
1895         if(c->flags & PMinSize) {
1896                 c->minw = size.min_width;
1897                 c->minh = size.min_height;
1898         }
1899         else if(c->flags & PBaseSize) {
1900                 c->minw = size.base_width;
1901                 c->minh = size.base_height;
1902         }
1903         else
1904                 c->minw = c->minh = 0;
1905         if(c->flags & PAspect) {
1906                 c->minax = size.min_aspect.x;
1907                 c->maxax = size.max_aspect.x;
1908                 c->minay = size.min_aspect.y;
1909                 c->maxay = size.max_aspect.y;
1910         }
1911         else
1912                 c->minax = c->maxax = c->minay = c->maxay = 0;
1913         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1914                         && c->maxw == c->minw && c->maxh == c->minh);
1915 }
1916
1917 void
1918 updatetitle(Client *c) {
1919         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1920                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1921 }
1922
1923 void
1924 updatewmhints(Client *c) {
1925         XWMHints *wmh;
1926
1927         if((wmh = XGetWMHints(dpy, c->win))) {
1928                 c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1929                 XFree(wmh);
1930         }
1931 }
1932
1933 void
1934 view(const char *arg) {
1935         unsigned int i, j;
1936         Bool tmp[LENGTH(tags)];
1937
1938         memcpy(tmp, seltags, TAGSZ);
1939         if(arg == NULL) {
1940                 for(i = 0; i < LENGTH(tags); i++)
1941                         tmp[i] = (vtags[i] == selview->id);
1942         }
1943         else {
1944                 i = idxoftag(arg);
1945                 for(j = 0; j < LENGTH(tags); j++)
1946                         if(selview->id == vtags[i]) {
1947                                 /* view tag of selview */
1948                                 if(selview->id == vtags[j])
1949                                         tmp[j] = False;
1950                         }
1951                         else {
1952                                 /* only touch the view the focus should go */
1953                                 if(vtags[j] == vtags[i])
1954                                         tmp[j] = False;
1955                         }
1956                 selview = &views[vtags[i]];
1957                 tmp[i] = True;
1958         }
1959         if(memcmp(seltags, tmp, TAGSZ) != 0) {
1960                 memcpy(prevtags, seltags, TAGSZ);
1961                 memcpy(seltags, tmp, TAGSZ);
1962                 arrange();
1963         }
1964 }
1965
1966 View *
1967 viewat() {
1968         int i, x, y;
1969         Window win;
1970         unsigned int mask;
1971
1972         XQueryPointer(dpy, root, &win, &win, &x, &y, &i, &i, &mask);
1973         for(i = 0; i < nviews; i++) {
1974                 if((x >= views[i].x && x < views[i].x + views[i].w)
1975                 && (y >= views[i].y && y < views[i].y + views[i].h))
1976                         return &views[i];
1977         }
1978         return NULL;
1979 }
1980
1981 void
1982 viewprevtag(const char *arg) {
1983         static Bool tmp[LENGTH(tags)];
1984
1985         memcpy(tmp, seltags, TAGSZ);
1986         memcpy(seltags, prevtags, TAGSZ);
1987         memcpy(prevtags, tmp, TAGSZ);
1988         arrange();
1989 }
1990
1991 /* There's no way to check accesses to destroyed windows, thus those cases are
1992  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1993  * default error handler, which may call exit.  */
1994 int
1995 xerror(Display *dpy, XErrorEvent *ee) {
1996         if(ee->error_code == BadWindow
1997         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1998         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1999         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2000         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2001         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2002         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2003         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2004                 return 0;
2005         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2006                 ee->request_code, ee->error_code);
2007         return xerrorxlib(dpy, ee); /* may call exit */
2008 }
2009
2010 int
2011 xerrordummy(Display *dpy, XErrorEvent *ee) {
2012         return 0;
2013 }
2014
2015 /* Startup Error handler to check if another window manager
2016  * is already running. */
2017 int
2018 xerrorstart(Display *dpy, XErrorEvent *ee) {
2019         otherwm = True;
2020         return -1;
2021 }
2022
2023 void
2024 zoom(const char *arg) {
2025         Client *c = sel;
2026
2027         if(!sel || !dozoom || sel->isfloating)
2028                 return;
2029         if(c == nexttiled(clients, getview(c)))
2030                 if(!(c = nexttiled(c->next, getview(c))))
2031                         return;
2032         detach(c);
2033         attach(c);
2034         focus(c);
2035         arrange();
2036 }
2037
2038 int
2039 main(int argc, char *argv[]) {
2040         if(argc == 2 && !strcmp("-v", argv[1]))
2041                 eprint("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
2042         else if(argc != 1)
2043                 eprint("usage: dwm [-v]\n");
2044
2045         setlocale(LC_CTYPE, "");
2046         if(!(dpy = XOpenDisplay(0)))
2047                 eprint("dwm: cannot open display\n");
2048
2049         checkotherwm();
2050         setup();
2051         scan();
2052         run();
2053         cleanup();
2054
2055         XCloseDisplay(dpy);
2056         return 0;
2057 }