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