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