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