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                 if(c->minay > 0 && c->maxay > 0 && (h - c->baseh) > 0 && (w - c->basew) > 0) {
1040                         dx = (double)(w - c->basew);
1041                         dy = (double)(h - c->baseh);
1042                         min = (double)(c->minax) / (double)(c->minay);
1043                         max = (double)(c->maxax) / (double)(c->maxay);
1044                         ratio = dx / dy;
1045                         if(max > 0 && min > 0 && ratio > 0) {
1046                                 if(ratio < min) {
1047                                         dy = (dx * min + dy) / (min * min + 1);
1048                                         dx = dy * min;
1049                                         w = (int)dx + c->basew;
1050                                         h = (int)dy + c->baseh;
1051                                 }
1052                                 else if(ratio > max) {
1053                                         dy = (dx * min + dy) / (max * max + 1);
1054                                         dx = dy * min;
1055                                         w = (int)dx + c->basew;
1056                                         h = (int)dy + c->baseh;
1057                                 }
1058                         }
1059                 }
1060                 if(c->minw && w < c->minw)
1061                         w = c->minw;
1062                 if(c->minh && h < c->minh)
1063                         h = c->minh;
1064                 if(c->maxw && w > c->maxw)
1065                         w = c->maxw;
1066                 if(c->maxh && h > c->maxh)
1067                         h = c->maxh;
1068                 if(c->incw)
1069                         w -= (w - c->basew) % c->incw;
1070                 if(c->inch)
1071                         h -= (h - c->baseh) % c->inch;
1072         }
1073         if(w <= 0 || h <= 0)
1074                 return;
1075         /* offscreen appearance fixes */
1076         if(x > sw)
1077                 x = sw - w - 2 * c->border;
1078         if(y > sh)
1079                 y = sh - h - 2 * c->border;
1080         if(x + w + 2 * c->border < sx)
1081                 x = sx;
1082         if(y + h + 2 * c->border < sy)
1083                 y = sy;
1084         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1085                 c->x = wc.x = x;
1086                 c->y = wc.y = y;
1087                 c->w = wc.width = w;
1088                 c->h = wc.height = h;
1089                 wc.border_width = c->border;
1090                 XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
1091                 configure(c);
1092                 XSync(dpy, False);
1093         }
1094 }
1095
1096 void
1097 resizemouse(Client *c) {
1098         int ocx, ocy;
1099         int nw, nh;
1100         XEvent ev;
1101
1102         ocx = c->x;
1103         ocy = c->y;
1104         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1105                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1106                 return;
1107         c->ismax = False;
1108         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1109         for(;;) {
1110                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
1111                 switch(ev.type) {
1112                 case ButtonRelease:
1113                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1114                                         c->w + c->border - 1, c->h + c->border - 1);
1115                         XUngrabPointer(dpy, CurrentTime);
1116                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1117                         return;
1118                 case ConfigureRequest:
1119                 case Expose:
1120                 case MapRequest:
1121                         handler[ev.type](&ev);
1122                         break;
1123                 case MotionNotify:
1124                         XSync(dpy, False);
1125                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1126                                 nw = 1;
1127                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1128                                 nh = 1;
1129                         resize(c, c->x, c->y, nw, nh, True);
1130                         break;
1131                 }
1132         }
1133 }
1134
1135 void
1136 restack(void) {
1137         Client *c;
1138         XEvent ev;
1139         XWindowChanges wc;
1140
1141         drawbar();
1142         if(!sel)
1143                 return;
1144         if(sel->isfloating || isarrange(floating))
1145                 XRaiseWindow(dpy, sel->win);
1146         if(!isarrange(floating)) {
1147                 wc.stack_mode = Below;
1148                 wc.sibling = barwin;
1149                 if(!sel->isfloating) {
1150                         XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1151                         wc.sibling = sel->win;
1152                 }
1153                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1154                         if(c == sel)
1155                                 continue;
1156                         XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1157                         wc.sibling = c->win;
1158                 }
1159         }
1160         XSync(dpy, False);
1161         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1162 }
1163
1164 void
1165 run(void) {
1166         char *p;
1167         int r, xfd;
1168         fd_set rd;
1169         XEvent ev;
1170
1171         /* main event loop, also reads status text from stdin */
1172         XSync(dpy, False);
1173         xfd = ConnectionNumber(dpy);
1174         readin = True;
1175         while(running) {
1176                 FD_ZERO(&rd);
1177                 if(readin)
1178                         FD_SET(STDIN_FILENO, &rd);
1179                 FD_SET(xfd, &rd);
1180                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1181                         if(errno == EINTR)
1182                                 continue;
1183                         eprint("select failed\n");
1184                 }
1185                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1186                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
1187                         case -1:
1188                                 strncpy(stext, strerror(errno), sizeof stext - 1);
1189                                 stext[sizeof stext - 1] = '\0';
1190                                 readin = False;
1191                                 break;
1192                         case 0:
1193                                 strncpy(stext, "EOF", 4);
1194                                 readin = False;
1195                                 break;
1196                         default:
1197                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
1198                                 for(; p >= stext && *p != '\n'; --p);
1199                                 if(p > stext)
1200                                         strncpy(stext, p + 1, sizeof stext);
1201                         }
1202                         drawbar();
1203                 }
1204                 while(XPending(dpy)) {
1205                         XNextEvent(dpy, &ev);
1206                         if(handler[ev.type])
1207                                 (handler[ev.type])(&ev); /* call handler */
1208                 }
1209         }
1210 }
1211
1212 void
1213 scan(void) {
1214         unsigned int i, num;
1215         Window *wins, d1, d2;
1216         XWindowAttributes wa;
1217
1218         wins = NULL;
1219         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1220                 for(i = 0; i < num; i++) {
1221                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1222                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1223                                 continue;
1224                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1225                                 manage(wins[i], &wa);
1226                 }
1227                 for(i = 0; i < num; i++) { /* now the transients */
1228                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1229                                 continue;
1230                         if(XGetTransientForHint(dpy, wins[i], &d1)
1231                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1232                                 manage(wins[i], &wa);
1233                 }
1234         }
1235         if(wins)
1236                 XFree(wins);
1237 }
1238
1239 void
1240 setclientstate(Client *c, long state) {
1241         long data[] = {state, None};
1242
1243         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1244                         PropModeReplace, (unsigned char *)data, 2);
1245 }
1246
1247 void
1248 setlayout(const char *arg) {
1249         unsigned int i;
1250
1251         if(!arg) {
1252                 if(++ltidx == nlayouts)
1253                         ltidx = 0;;
1254         }
1255         else {
1256                 for(i = 0; i < nlayouts; i++)
1257                         if(!strcmp(arg, layouts[i].symbol))
1258                                 break;
1259                 if(i == nlayouts)
1260                         return;
1261                 ltidx = i;
1262         }
1263         if(sel)
1264                 arrange();
1265         else
1266                 drawbar();
1267 }
1268
1269 void
1270 setmwfact(const char *arg) {
1271         double delta;
1272
1273         if(!ISTILE)
1274                 return;
1275         /* arg handling, manipulate mwfact */
1276         if(arg == NULL)
1277                 mwfact = MWFACT;
1278         else if(1 == sscanf(arg, "%lf", &delta)) {
1279                 if(arg[0] == '+' || arg[0] == '-')
1280                         mwfact += delta;
1281                 else
1282                         mwfact = delta;
1283                 if(mwfact < 0.1)
1284                         mwfact = 0.1;
1285                 else if(mwfact > 0.9)
1286                         mwfact = 0.9;
1287         }
1288         arrange();
1289 }
1290
1291 void
1292 setup(void) {
1293         int d;
1294         unsigned int i, j, mask;
1295         Window w;
1296         XModifierKeymap *modmap;
1297         XSetWindowAttributes wa;
1298
1299         /* init atoms */
1300         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1301         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1302         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1303         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1304         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1305         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1306         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1307                         PropModeReplace, (unsigned char *) netatom, NetLast);
1308
1309         /* init cursors */
1310         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1311         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1312         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1313
1314         /* init geometry */
1315         sx = sy = 0;
1316         sw = DisplayWidth(dpy, screen);
1317         sh = DisplayHeight(dpy, screen);
1318
1319         /* init modifier map */
1320         modmap = XGetModifierMapping(dpy);
1321         for(i = 0; i < 8; i++)
1322                 for(j = 0; j < modmap->max_keypermod; j++) {
1323                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1324                         == XKeysymToKeycode(dpy, XK_Num_Lock))
1325                                 numlockmask = (1 << i);
1326                 }
1327         XFreeModifiermap(modmap);
1328
1329         /* select for events */
1330         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1331                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1332         wa.cursor = cursor[CurNormal];
1333         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1334         XSelectInput(dpy, root, wa.event_mask);
1335
1336         /* grab keys */
1337         keypress(NULL);
1338
1339         /* init tags */
1340         compileregs();
1341
1342         /* init appearance */
1343         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1344         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1345         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1346         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1347         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1348         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1349         initfont(FONT);
1350         dc.h = bh = dc.font.height + 2;
1351
1352         /* init layouts */
1353         mwfact = MWFACT;
1354         nlayouts = sizeof layouts / sizeof layouts[0];
1355         for(blw = i = 0; i < nlayouts; i++) {
1356                 j = textw(layouts[i].symbol);
1357                 if(j > blw)
1358                         blw = j;
1359         }
1360
1361         /* init bar */
1362         bpos = BARPOS;
1363         wa.override_redirect = 1;
1364         wa.background_pixmap = ParentRelative;
1365         wa.event_mask = ButtonPressMask | ExposureMask;
1366         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
1367                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1368                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
1369         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1370         updatebarpos();
1371         XMapRaised(dpy, barwin);
1372         strcpy(stext, "dwm-"VERSION);
1373         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
1374         dc.gc = XCreateGC(dpy, root, 0, 0);
1375         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1376         if(!dc.font.set)
1377                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1378
1379         /* multihead support */
1380         selscreen = XQueryPointer(dpy, root, &w, &w, &d, &d, &d, &d, &mask);
1381 }
1382
1383 void
1384 spawn(const char *arg) {
1385         static char *shell = NULL;
1386
1387         if(!shell && !(shell = getenv("SHELL")))
1388                 shell = "/bin/sh";
1389         if(!arg)
1390                 return;
1391         /* The double-fork construct avoids zombie processes and keeps the code
1392          * clean from stupid signal handlers. */
1393         if(fork() == 0) {
1394                 if(fork() == 0) {
1395                         if(dpy)
1396                                 close(ConnectionNumber(dpy));
1397                         setsid();
1398                         execl(shell, shell, "-c", arg, (char *)NULL);
1399                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1400                         perror(" failed");
1401                 }
1402                 exit(0);
1403         }
1404         wait(0);
1405 }
1406
1407 void
1408 tag(const char *arg) {
1409         unsigned int i;
1410
1411         if(!sel)
1412                 return;
1413         for(i = 0; i < ntags; i++)
1414                 sel->tags[i] = arg == NULL;
1415         i = idxoftag(arg);
1416         if(i >= 0 && i < ntags)
1417                 sel->tags[i] = True;
1418         arrange();
1419 }
1420
1421 unsigned int
1422 textnw(const char *text, unsigned int len) {
1423         XRectangle r;
1424
1425         if(dc.font.set) {
1426                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1427                 return r.width;
1428         }
1429         return XTextWidth(dc.font.xfont, text, len);
1430 }
1431
1432 unsigned int
1433 textw(const char *text) {
1434         return textnw(text, strlen(text)) + dc.font.height;
1435 }
1436
1437 void
1438 tile(void) {
1439         unsigned int i, n, nx, ny, nw, nh, mw, th;
1440         Client *c, *mc;
1441
1442         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
1443                 n++;
1444
1445         /* window geoms */
1446         mw = (n == 1) ? waw : mwfact * waw;
1447         th = (n > 1) ? wah / (n - 1) : 0;
1448         if(n > 1 && th < bh)
1449                 th = wah;
1450
1451         nx = wax;
1452         ny = way;
1453         nw = 0; /* gcc stupidity requires this */
1454         for(i = 0, c = mc = nexttiled(clients); c; c = nexttiled(c->next), i++) {
1455                 c->ismax = False;
1456                 if(i == 0) { /* master */
1457                         nw = mw - 2 * c->border;
1458                         nh = wah - 2 * c->border;
1459                 }
1460                 else {  /* tile window */
1461                         if(i == 1) {
1462                                 ny = way;
1463                                 nx += mc->w + 2 * mc->border;
1464                                 nw = waw - nx - 2 * c->border;
1465                         }
1466                         if(i + 1 == n) /* remainder */
1467                                 nh = (way + wah) - ny - 2 * c->border;
1468                         else
1469                                 nh = th - 2 * c->border;
1470                 }
1471                 resize(c, nx, ny, nw, nh, RESIZEHINTS);
1472                 if(n > 1 && th != wah)
1473                         ny = c->y + c->h + 2 * c->border;
1474         }
1475 }
1476
1477 void
1478 togglebar(const char *arg) {
1479         if(bpos == BarOff)
1480                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1481         else
1482                 bpos = BarOff;
1483         updatebarpos();
1484         arrange();
1485 }
1486
1487 void
1488 togglefloating(const char *arg) {
1489         if(!sel)
1490                 return;
1491         sel->isfloating = !sel->isfloating;
1492         if(sel->isfloating)
1493                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1494         arrange();
1495 }
1496
1497 void
1498 togglemax(const char *arg) {
1499         XEvent ev;
1500
1501         if(!sel || sel->isfixed)
1502                 return;
1503         if((sel->ismax = !sel->ismax)) {
1504                 if(isarrange(floating) || sel->isfloating)
1505                         sel->wasfloating = True;
1506                 else {
1507                         togglefloating(NULL);
1508                         sel->wasfloating = False;
1509                 }
1510                 sel->rx = sel->x;
1511                 sel->ry = sel->y;
1512                 sel->rw = sel->w;
1513                 sel->rh = sel->h;
1514                 resize(sel, wax, way, waw - 2 * sel->border, wah - 2 * sel->border, True);
1515         }
1516         else {
1517                 resize(sel, sel->rx, sel->ry, sel->rw, sel->rh, True);
1518                 if(!sel->wasfloating)
1519                         togglefloating(NULL);
1520         }
1521         drawbar();
1522         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1523 }
1524
1525 void
1526 toggletag(const char *arg) {
1527         unsigned int i, j;
1528
1529         if(!sel)
1530                 return;
1531         i = idxoftag(arg);
1532         sel->tags[i] = !sel->tags[i];
1533         for(j = 0; j < ntags && !sel->tags[j]; j++);
1534         if(j == ntags)
1535                 sel->tags[i] = True;
1536         arrange();
1537 }
1538
1539 void
1540 toggleview(const char *arg) {
1541         unsigned int i, j;
1542
1543         i = idxoftag(arg);
1544         seltags[i] = !seltags[i];
1545         for(j = 0; j < ntags && !seltags[j]; j++);
1546         if(j == ntags)
1547                 seltags[i] = True; /* at least one tag must be viewed */
1548         arrange();
1549 }
1550
1551 void
1552 unban(Client *c) {
1553         if(!c->isbanned)
1554                 return;
1555         XMoveWindow(dpy, c->win, c->x, c->y);
1556         c->isbanned = False;
1557 }
1558
1559 void
1560 unmanage(Client *c) {
1561         XWindowChanges wc;
1562
1563         wc.border_width = c->oldborder;
1564         /* The server grab construct avoids race conditions. */
1565         XGrabServer(dpy);
1566         XSetErrorHandler(xerrordummy);
1567         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1568         detach(c);
1569         detachstack(c);
1570         if(sel == c)
1571                 focus(NULL);
1572         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1573         setclientstate(c, WithdrawnState);
1574         free(c->tags);
1575         free(c);
1576         XSync(dpy, False);
1577         XSetErrorHandler(xerror);
1578         XUngrabServer(dpy);
1579         arrange();
1580 }
1581
1582 void
1583 unmapnotify(XEvent *e) {
1584         Client *c;
1585         XUnmapEvent *ev = &e->xunmap;
1586
1587         if((c = getclient(ev->window)))
1588                 unmanage(c);
1589 }
1590
1591 void
1592 updatebarpos(void) {
1593         XEvent ev;
1594
1595         wax = sx;
1596         way = sy;
1597         wah = sh;
1598         waw = sw;
1599         switch(bpos) {
1600         default:
1601                 wah -= bh;
1602                 way += bh;
1603                 XMoveWindow(dpy, barwin, sx, sy);
1604                 break;
1605         case BarBot:
1606                 wah -= bh;
1607                 XMoveWindow(dpy, barwin, sx, sy + wah);
1608                 break;
1609         case BarOff:
1610                 XMoveWindow(dpy, barwin, sx, sy - bh);
1611                 break;
1612         }
1613         XSync(dpy, False);
1614         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1615 }
1616
1617 void
1618 updatesizehints(Client *c) {
1619         long msize;
1620         XSizeHints size;
1621
1622         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1623                 size.flags = PSize;
1624         c->flags = size.flags;
1625         if(c->flags & PBaseSize) {
1626                 c->basew = size.base_width;
1627                 c->baseh = size.base_height;
1628         }
1629         else if(c->flags & PMinSize) {
1630                 c->basew = size.min_width;
1631                 c->baseh = size.min_height;
1632         }
1633         else
1634                 c->basew = c->baseh = 0;
1635         if(c->flags & PResizeInc) {
1636                 c->incw = size.width_inc;
1637                 c->inch = size.height_inc;
1638         }
1639         else
1640                 c->incw = c->inch = 0;
1641         if(c->flags & PMaxSize) {
1642                 c->maxw = size.max_width;
1643                 c->maxh = size.max_height;
1644         }
1645         else
1646                 c->maxw = c->maxh = 0;
1647         if(c->flags & PMinSize) {
1648                 c->minw = size.min_width;
1649                 c->minh = size.min_height;
1650         }
1651         else if(c->flags & PBaseSize) {
1652                 c->minw = size.base_width;
1653                 c->minh = size.base_height;
1654         }
1655         else
1656                 c->minw = c->minh = 0;
1657         if(c->flags & PAspect) {
1658                 c->minax = size.min_aspect.x;
1659                 c->maxax = size.max_aspect.x;
1660                 c->minay = size.min_aspect.y;
1661                 c->maxay = size.max_aspect.y;
1662         }
1663         else
1664                 c->minax = c->maxax = c->minay = c->maxay = 0;
1665         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1666                         && c->maxw == c->minw && c->maxh == c->minh);
1667 }
1668
1669 void
1670 updatetitle(Client *c) {
1671         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1672                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1673 }
1674
1675 /* There's no way to check accesses to destroyed windows, thus those cases are
1676  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1677  * default error handler, which may call exit.  */
1678 int
1679 xerror(Display *dpy, XErrorEvent *ee) {
1680         if(ee->error_code == BadWindow
1681         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1682         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1683         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1684         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1685         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1686         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1687         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1688                 return 0;
1689         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1690                 ee->request_code, ee->error_code);
1691         return xerrorxlib(dpy, ee); /* may call exit */
1692 }
1693
1694 int
1695 xerrordummy(Display *dsply, XErrorEvent *ee) {
1696         return 0;
1697 }
1698
1699 /* Startup Error handler to check if another window manager
1700  * is already running. */
1701 int
1702 xerrorstart(Display *dsply, XErrorEvent *ee) {
1703         otherwm = True;
1704         return -1;
1705 }
1706
1707 void
1708 view(const char *arg) {
1709         unsigned int i;
1710
1711         memcpy(prevtags, seltags, sizeof seltags);
1712         for(i = 0; i < ntags; i++)
1713                 seltags[i] = arg == NULL;
1714         i = idxoftag(arg);
1715         if(i >= 0 && i < ntags)
1716                 seltags[i] = True;
1717         arrange();
1718 }
1719
1720 void
1721 viewprevtag(const char *arg) {
1722         static Bool tmptags[sizeof tags / sizeof tags[0]];
1723
1724         memcpy(tmptags, seltags, sizeof seltags);
1725         memcpy(seltags, prevtags, sizeof seltags);
1726         memcpy(prevtags, tmptags, sizeof seltags);
1727         arrange();
1728 }
1729
1730 void
1731 zoom(const char *arg) {
1732         Client *c;
1733
1734         if(!sel || !ISTILE || sel->isfloating)
1735                 return;
1736         if((c = sel) == nexttiled(clients))
1737                 if(!(c = nexttiled(c->next)))
1738                         return;
1739         detach(c);
1740         attach(c);
1741         focus(c);
1742         arrange();
1743 }
1744
1745 int
1746 main(int argc, char *argv[]) {
1747         if(argc == 2 && !strcmp("-v", argv[1]))
1748                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
1749         else if(argc != 1)
1750                 eprint("usage: dwm [-v]\n");
1751
1752         setlocale(LC_CTYPE, "");
1753         if(!(dpy = XOpenDisplay(0)))
1754                 eprint("dwm: cannot open display\n");
1755         screen = DefaultScreen(dpy);
1756         root = RootWindow(dpy, screen);
1757
1758         checkotherwm();
1759         setup();
1760         drawbar();
1761         scan();
1762         run();
1763         cleanup();
1764
1765         XCloseDisplay(dpy);
1766         return 0;
1767 }