dwm.c

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