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         int *tags;
  71         long flags;
  72         unsigned int border, oldborder;
  73         Bool isbanned, isfixed, isfloating, isurgent;
  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 *tags;
 110         Bool isfloating;
 111 } Rule;
 112
 113 typedef struct {
 114         regex_t *propregex;
 115         regex_t *tagregex;
 116 } Regs;
 117
 118 struct View {
 119         int id;
 120         int x, y, w, h, wax, way, wah, waw;
 121         double mwfact;
 122         Layout *layout;
 123         Window barwin;
 124 };
 125
 126 /* function declarations */
 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 compileregs(void);
 136 void configure(Client *c);
 137 void configurenotify(XEvent *e);
 138 void configurerequest(XEvent *e);
 139 void destroynotify(XEvent *e);
 140 void detach(Client *c);
 141 void detachstack(Client *c);
 142 void drawbar(View *v);
 143 void drawsquare(View *v, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 144 void drawtext(View *v, const char *text, unsigned long col[ColLast], Bool invert);
 145 void *emallocz(unsigned int size);
 146 void enternotify(XEvent *e);
 147 void eprint(const char *errstr, ...);
 148 void expose(XEvent *e);
 149 void floating(View *v); /* default floating layout */
 150 void focus(Client *c);
 151 void focusin(XEvent *e);
 152 void focusnext(const char *arg);
 153 void focusprev(const char *arg);
 154 Client *getclient(Window w);
 155 unsigned long getcolor(const char *colstr);
 156 View *getviewbar(Window barwin);
 157 View *getview(Client *c);
 158 long getstate(Window w);
 159 Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 160 void grabbuttons(Client *c, Bool focused);
 161 void grabkeys(void);
 162 unsigned int idxoftag(const char *tag);
 163 void initfont(const char *fontstr);
 164 Bool isoccupied(unsigned int t);
 165 Bool isprotodel(Client *c);
 166 Bool isurgent(unsigned int t);
 167 Bool isvisible(Client *c);
 168 void keypress(XEvent *e);
 169 void killclient(const char *arg);
 170 void manage(Window w, XWindowAttributes *wa);
 171 void mappingnotify(XEvent *e);
 172 void maprequest(XEvent *e);
 173 View *viewat(void);
 174 void movemouse(Client *c);
 175 Client *nexttiled(Client *c, View *v);
 176 void propertynotify(XEvent *e);
 177 void quit(const char *arg);
 178 void reapply(const char *arg);
 179 void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 180 void resizemouse(Client *c);
 181 void restack(View *v);
 182 void run(void);
 183 void scan(void);
 184 void setclientstate(Client *c, long state);
 185 void setlayout(const char *arg);
 186 void setmwfact(const char *arg);
 187 void setup(void);
 188 void spawn(const char *arg);
 189 void tag(const char *arg);
 190 unsigned int textnw(const char *text, unsigned int len);
 191 unsigned int textw(const char *text);
 192 void tile(View *v);
 193 void togglebar(const char *arg);
 194 void togglefloating(const char *arg);
 195 void toggletag(const char *arg);
 196 void toggleview(const char *arg);
 197 void unban(Client *c);
 198 void unmanage(Client *c);
 199 void unmapnotify(XEvent *e);
 200 void updatebarpos(View *v);
 201 void updatesizehints(Client *c);
 202 void updatetitle(Client *c);
 203 void updatewmhints(Client *c);
 204 void view(const char *arg);
 205 void viewprevtag(const char *arg);      /* views previous selected tags */
 206 int xerror(Display *dpy, XErrorEvent *ee);
 207 int xerrordummy(Display *dpy, XErrorEvent *ee);
 208 int xerrorstart(Display *dpy, XErrorEvent *ee);
 209 void zoom(const char *arg);
 210 void selectview(const char *arg);
 211
 212 /* variables */
 213 char stext[256];
 214 int nviews = 1;
 215 View *selview;
 216 int screen;
 217 int *seltags;
 218 int *prevtags;
 219 int (*xerrorxlib)(Display *, XErrorEvent *);
 220 unsigned int bh, bpos;
 221 unsigned int blw = 0;
 222 unsigned int numlockmask = 0;
 223 void (*handler[LASTEvent]) (XEvent *) = {
 224         [ButtonPress] = buttonpress,
 225         [ConfigureRequest] = configurerequest,
 226         [ConfigureNotify] = configurenotify,
 227         [DestroyNotify] = destroynotify,
 228         [EnterNotify] = enternotify,
 229         [Expose] = expose,
 230         [FocusIn] = focusin,
 231         [KeyPress] = keypress,
 232         [MappingNotify] = mappingnotify,
 233         [MapRequest] = maprequest,
 234         [PropertyNotify] = propertynotify,
 235         [UnmapNotify] = unmapnotify
 236 };
 237 Atom wmatom[WMLast], netatom[NetLast];
 238 Bool isxinerama = False;
 239 Bool domwfact = True;
 240 Bool dozoom = True;
 241 Bool otherwm, readin;
 242 Bool running = True;
 243 Client *clients = NULL;
 244 Client *sel = NULL;
 245 Client *stack = NULL;
 246 Cursor cursor[CurLast];
 247 Display *dpy;
 248 DC dc = {0};
 249 Regs *regs = NULL;
 250 View *views;
 251 Window root;
 252
 253 /* configuration, allows nested code to access above variables */
 254 #include "config.h"
 255
 256 /* function implementations */
 257 void
 258 applyrules(Client *c) {
 259         static char buf[512];
 260         unsigned int i, j;
 261         regmatch_t tmp;
 262         Bool matched_tag = False;
 263         XClassHint ch = { 0 };
 264
 265         /* rule matching */
 266         XGetClassHint(dpy, c->win, &ch);
 267         snprintf(buf, sizeof buf, "%s:%s:%s",
 268                         ch.res_class ? ch.res_class : "",
 269                         ch.res_name ? ch.res_name : "", c->name);
 270         for(i = 0; i < LENGTH(rules); i++)
 271                 if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
 272                         c->isfloating = rules[i].isfloating;
 273                         for(j = 0; regs[i].tagregex && j < LENGTH(tags); j++) {
 274                                 if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
 275                                         matched_tag = True;
 276                                         c->tags[j] = selview->id;
 277                                 }
 278                         }
 279                 }
 280         if(ch.res_class)
 281                 XFree(ch.res_class);
 282         if(ch.res_name)
 283                 XFree(ch.res_name);
 284         if(!matched_tag)
 285                 memcpy(c->tags, seltags, sizeof initags);
 286 }
 287
 288
 289
 290 void
 291 arrange(void) {
 292         unsigned int i;
 293         Client *c;
 294
 295         for(c = clients; c; c = c->next)
 296                 if(isvisible(c))
 297                         unban(c);
 298                 else
 299                         ban(c);
 300
 301         for(i = 0; i < nviews; i++) {
 302                 views[i].layout->arrange(&views[i]);
 303                 restack(&views[i]);
 304         }
 305         focus(NULL);
 306 }
 307
 308 void
 309 attach(Client *c) {
 310         if(clients)
 311                 clients->prev = c;
 312         c->next = clients;
 313         clients = c;
 314 }
 315
 316 void
 317 attachstack(Client *c) {
 318         c->snext = stack;
 319         stack = c;
 320 }
 321
 322 void
 323 ban(Client *c) {
 324         if(c->isbanned)
 325                 return;
 326         XMoveWindow(dpy, c->win, c->x + 3 * getview(c)->w, c->y);
 327         c->isbanned = True;
 328 }
 329
 330 void
 331 buttonpress(XEvent *e) {
 332         unsigned int i, x;
 333         Client *c;
 334         XButtonPressedEvent *ev = &e->xbutton;
 335
 336         View *v = selview;
 337
 338         if(ev->window == v->barwin) {
 339                 x = 0;
 340                 for(i = 0; i < LENGTH(tags); i++) {
 341                         x += textw(tags[i]);
 342                         if(ev->x < x) {
 343                                 if(ev->button == Button1) {
 344                                         if(ev->state & MODKEY)
 345                                                 tag(tags[i]);
 346                                         else
 347                                                 view(tags[i]);
 348                                 }
 349                                 else if(ev->button == Button3) {
 350                                         if(ev->state & MODKEY)
 351                                                 toggletag(tags[i]);
 352                                         else
 353                                                 toggleview(tags[i]);
 354                                 }
 355                                 return;
 356                         }
 357                 }
 358                 if((ev->x < x + blw) && ev->button == Button1)
 359                         setlayout(NULL);
 360         }
 361         else if((c = getclient(ev->window))) {
 362                 focus(c);
 363                 if(CLEANMASK(ev->state) != MODKEY)
 364                         return;
 365                 if(ev->button == Button1) {
 366                         restack(getview(c));
 367                         movemouse(c);
 368                 }
 369                 else if(ev->button == Button2) {
 370                         if((floating != v->layout->arrange) && c->isfloating)
 371                                 togglefloating(NULL);
 372                         else
 373                                 zoom(NULL);
 374                 }
 375                 else if(ev->button == Button3 && !c->isfixed) {
 376                         restack(getview(c));
 377                         resizemouse(c);
 378                 }
 379         }
 380 }
 381
 382 void
 383 checkotherwm(void) {
 384         otherwm = False;
 385         XSetErrorHandler(xerrorstart);
 386
 387         /* this causes an error if some other window manager is running */
 388         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 389         XSync(dpy, False);
 390         if(otherwm)
 391                 eprint("dwm: another window manager is already running\n");
 392         XSync(dpy, False);
 393         XSetErrorHandler(NULL);
 394         xerrorxlib = XSetErrorHandler(xerror);
 395         XSync(dpy, False);
 396 }
 397
 398 void
 399 cleanup(void) {
 400         unsigned int i;
 401         close(STDIN_FILENO);
 402         while(stack) {
 403                 unban(stack);
 404                 unmanage(stack);
 405         }
 406         if(dc.font.set)
 407                 XFreeFontSet(dpy, dc.font.set);
 408         else
 409                 XFreeFont(dpy, dc.font.xfont);
 410
 411         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 412         XFreePixmap(dpy, dc.drawable);
 413         XFreeGC(dpy, dc.gc);
 414         XFreeCursor(dpy, cursor[CurNormal]);
 415         XFreeCursor(dpy, cursor[CurResize]);
 416         XFreeCursor(dpy, cursor[CurMove]);
 417         for(i = 0; i < nviews; i++)
 418                 XDestroyWindow(dpy, views[i].barwin);
 419         XSync(dpy, False);
 420         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 421 }
 422
 423 void
 424 compileregs(void) {
 425         unsigned int i;
 426         regex_t *reg;
 427
 428         if(regs)
 429                 return;
 430         regs = emallocz(LENGTH(rules) * sizeof(Regs));
 431         for(i = 0; i < LENGTH(rules); i++) {
 432                 if(rules[i].prop) {
 433                         reg = emallocz(sizeof(regex_t));
 434                         if(regcomp(reg, rules[i].prop, REG_EXTENDED))
 435                                 free(reg);
 436                         else
 437                                 regs[i].propregex = reg;
 438                 }
 439                 if(rules[i].tags) {
 440                         reg = emallocz(sizeof(regex_t));
 441                         if(regcomp(reg, rules[i].tags, REG_EXTENDED))
 442                                 free(reg);
 443                         else
 444                                 regs[i].tagregex = reg;
 445                 }
 446         }
 447 }
 448
 449 void
 450 configure(Client *c) {
 451         XConfigureEvent ce;
 452
 453         ce.type = ConfigureNotify;
 454         ce.display = dpy;
 455         ce.event = c->win;
 456         ce.window = c->win;
 457         ce.x = c->x;
 458         ce.y = c->y;
 459         ce.width = c->w;
 460         ce.height = c->h;
 461         ce.border_width = c->border;
 462         ce.above = None;
 463         ce.override_redirect = False;
 464         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 465 }
 466
 467 void
 468 configurenotify(XEvent *e) {
 469         XConfigureEvent *ev = &e->xconfigure;
 470         View *v = selview;
 471
 472         if(ev->window == root && (ev->width != v->w || ev->height != v->h)) {
 473                 /* TODO -- update Xinerama dimensions here */
 474                 v->w = ev->width;
 475                 v->h = ev->height;
 476                 XFreePixmap(dpy, dc.drawable);
 477                 dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(root, screen), bh, DefaultDepth(dpy, screen));
 478                 XResizeWindow(dpy, v->barwin, v->w, bh);
 479                 updatebarpos(v);
 480                 arrange();
 481         }
 482 }
 483
 484 void
 485 configurerequest(XEvent *e) {
 486         Client *c;
 487         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 488         XWindowChanges wc;
 489
 490         if((c = getclient(ev->window))) {
 491                 View *v = getview(c);
 492                 if(ev->value_mask & CWBorderWidth)
 493                         c->border = ev->border_width;
 494                 if(c->isfixed || c->isfloating || (floating == v->layout->arrange)) {
 495                         if(ev->value_mask & CWX)
 496                                 c->x = v->x + ev->x;
 497                         if(ev->value_mask & CWY)
 498                                 c->y = v->y + ev->y;
 499                         if(ev->value_mask & CWWidth)
 500                                 c->w = ev->width;
 501                         if(ev->value_mask & CWHeight)
 502                                 c->h = ev->height;
 503                         if((c->x - v->x + c->w) > v->w && c->isfloating)
 504                                 c->x = v->x + (v->w / 2 - c->w / 2); /* center in x direction */
 505                         if((c->y - v->y + c->h) > v->h && c->isfloating)
 506                                 c->y = v->y + (v->h / 2 - c->h / 2); /* center in y direction */
 507                         if((ev->value_mask & (CWX|CWY))
 508                         && !(ev->value_mask & (CWWidth|CWHeight)))
 509                                 configure(c);
 510                         if(isvisible(c))
 511                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 512                 }
 513                 else
 514                         configure(c);
 515         }
 516         else {
 517                 wc.x = ev->x;
 518                 wc.y = ev->y;
 519                 wc.width = ev->width;
 520                 wc.height = ev->height;
 521                 wc.border_width = ev->border_width;
 522                 wc.sibling = ev->above;
 523                 wc.stack_mode = ev->detail;
 524                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 525         }
 526         XSync(dpy, False);
 527 }
 528
 529 void
 530 destroynotify(XEvent *e) {
 531         Client *c;
 532         XDestroyWindowEvent *ev = &e->xdestroywindow;
 533
 534         if((c = getclient(ev->window)))
 535                 unmanage(c);
 536 }
 537
 538 void
 539 detach(Client *c) {
 540         if(c->prev)
 541                 c->prev->next = c->next;
 542         if(c->next)
 543                 c->next->prev = c->prev;
 544         if(c == clients)
 545                 clients = c->next;
 546         c->next = c->prev = NULL;
 547 }
 548
 549 void
 550 detachstack(Client *c) {
 551         Client **tc;
 552
 553         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 554         *tc = c->snext;
 555 }
 556
 557 void
 558 drawbar(View *v) {
 559         int i, x;
 560         Client *c;
 561
 562         dc.x = 0;
 563         for(c = stack; c && !isvisible(c); c = c->snext);
 564         for(i = 0; i < LENGTH(tags); i++) {
 565                 dc.w = textw(tags[i]);
 566                 if(seltags[i]) {
 567                         drawtext(v, tags[i], dc.sel, isurgent(i));
 568                         drawsquare(v, c && c->tags[i], isoccupied(i), isurgent(i), dc.sel);
 569                 }
 570                 else {
 571                         drawtext(v, tags[i], dc.norm, isurgent(i));
 572                         drawsquare(v, c && c->tags[i], isoccupied(i), isurgent(i), dc.norm);
 573                 }
 574                 dc.x += dc.w;
 575         }
 576         dc.w = blw;
 577         drawtext(v, v->layout->symbol, dc.norm, False);
 578         x = dc.x + dc.w;
 579         if(v == selview) {
 580                 dc.w = textw(stext);
 581                 dc.x = v->w - dc.w;
 582                 if(dc.x < x) {
 583                         dc.x = x;
 584                         dc.w = v->w - x;
 585                 }
 586                 drawtext(v, stext, dc.norm, False);
 587         }
 588         else
 589                 dc.x = v->w;
 590         if((dc.w = dc.x - x) > bh) {
 591                 dc.x = x;
 592                 if(c) {
 593                         drawtext(v, c->name, dc.sel, False);
 594                         drawsquare(v, False, c->isfloating, False, dc.sel);
 595                 }
 596                 else
 597                         drawtext(v, NULL, dc.norm, False);
 598         }
 599         XCopyArea(dpy, dc.drawable, v->barwin, dc.gc, 0, 0, v->w, bh, 0, 0);
 600         XSync(dpy, False);
 601 }
 602
 603 void
 604 drawsquare(View *v, Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 605         int x;
 606         XGCValues gcv;
 607         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 608
 609         gcv.foreground = col[invert ? ColBG : ColFG];
 610         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 611         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 612         r.x = dc.x + 1;
 613         r.y = dc.y + 1;
 614         if(filled) {
 615                 r.width = r.height = x + 1;
 616                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 617         }
 618         else if(empty) {
 619                 r.width = r.height = x;
 620                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 621         }
 622 }
 623
 624 void
 625 drawtext(View *v, const char *text, unsigned long col[ColLast], Bool invert) {
 626         int x, y, w, h;
 627         static char buf[256];
 628         unsigned int len, olen;
 629         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 630
 631         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 632         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 633         if(!text)
 634                 return;
 635         w = 0;
 636         olen = len = strlen(text);
 637         if(len >= sizeof buf)
 638                 len = sizeof buf - 1;
 639         memcpy(buf, text, len);
 640         buf[len] = 0;
 641         h = dc.font.ascent + dc.font.descent;
 642         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 643         x = dc.x + (h / 2);
 644         /* shorten text if necessary */
 645         while(len && (w = textnw(buf, len)) > dc.w - h)
 646                 buf[--len] = 0;
 647         if(len < olen) {
 648                 if(len > 1)
 649                         buf[len - 1] = '.';
 650                 if(len > 2)
 651                         buf[len - 2] = '.';
 652                 if(len > 3)
 653                         buf[len - 3] = '.';
 654         }
 655         if(w > dc.w)
 656                 return; /* too long */
 657         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 658         if(dc.font.set)
 659                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 660         else
 661                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 662 }
 663
 664 void *
 665 emallocz(unsigned int size) {
 666         void *res = calloc(1, size);
 667
 668         if(!res)
 669                 eprint("fatal: could not malloc() %u bytes\n", size);
 670         return res;
 671 }
 672
 673 void
 674 enternotify(XEvent *e) {
 675         Client *c;
 676         XCrossingEvent *ev = &e->xcrossing;
 677
 678         if(ev->mode != NotifyNormal || ev->detail == NotifyInferior) {
 679                 if(!isxinerama || ev->window != root)
 680                         return;
 681         }
 682         if((c = getclient(ev->window)))
 683                 focus(c);
 684         else
 685                 focus(NULL);
 686 }
 687
 688 void
 689 eprint(const char *errstr, ...) {
 690         va_list ap;
 691
 692         va_start(ap, errstr);
 693         vfprintf(stderr, errstr, ap);
 694         va_end(ap);
 695         exit(EXIT_FAILURE);
 696 }
 697
 698 void
 699 expose(XEvent *e) {
 700         View *v;
 701         XExposeEvent *ev = &e->xexpose;
 702
 703         if(ev->count == 0 && (v = getviewbar(ev->window)))
 704                 drawbar(v);
 705 }
 706
 707 void
 708 floating(View *v) { /* default floating layout */
 709         Client *c;
 710
 711         domwfact = dozoom = False;
 712         for(c = clients; c; c = c->next)
 713                 if(isvisible(c))
 714                         resize(c, c->x, c->y, c->w, c->h, True);
 715 }
 716
 717 void
 718 focus(Client *c) {
 719         View *v = selview;
 720         if(c)
 721                 selview = getview(c);
 722         else
 723                 selview = viewat();
 724         if(selview != v)
 725                 drawbar(v);
 726         if(!c || (c && !isvisible(c)))
 727                 for(c = stack; c && !isvisible(c); c = c->snext);
 728         if(sel && sel != c) {
 729                 grabbuttons(sel, False);
 730                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 731         }
 732         if(c) {
 733                 detachstack(c);
 734                 attachstack(c);
 735                 grabbuttons(c, True);
 736         }
 737         sel = c;
 738         if(c) {
 739                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 740                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 741                 selview = getview(c);
 742         }
 743         else
 744                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 745         drawbar(selview);
 746 }
 747
 748 void
 749 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 750         XFocusChangeEvent *ev = &e->xfocus;
 751
 752         if(sel && ev->window != sel->win)
 753                 XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 754 }
 755
 756 void
 757 focusnext(const char *arg) {
 758         Client *c;
 759
 760         if(!sel)
 761                 return;
 762         for(c = sel->next; c && !isvisible(c); c = c->next);
 763         if(!c)
 764                 for(c = clients; c && !isvisible(c); c = c->next);
 765         if(c) {
 766                 focus(c);
 767                 restack(getview(c));
 768         }
 769 }
 770
 771 void
 772 focusprev(const char *arg) {
 773         Client *c;
 774
 775         if(!sel)
 776                 return;
 777         for(c = sel->prev; c && !isvisible(c); c = c->prev);
 778         if(!c) {
 779                 for(c = clients; c && c->next; c = c->next);
 780                 for(; c && !isvisible(c); c = c->prev);
 781         }
 782         if(c) {
 783                 focus(c);
 784                 restack(getview(c));
 785         }
 786 }
 787
 788 Client *
 789 getclient(Window w) {
 790         Client *c;
 791
 792         for(c = clients; c && c->win != w; c = c->next);
 793         return c;
 794 }
 795
 796 unsigned long
 797 getcolor(const char *colstr) {
 798         Colormap cmap = DefaultColormap(dpy, screen);
 799         XColor color;
 800
 801         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 802                 eprint("error, cannot allocate color '%s'\n", colstr);
 803         return color.pixel;
 804 }
 805
 806 View *
 807 getviewbar(Window barwin) {
 808         unsigned int i;
 809
 810         for(i = 0; i < nviews; i++)
 811                 if(views[i].barwin == barwin)
 812                         return &views[i];
 813         return NULL;
 814 }
 815
 816 View *
 817 getview(Client *c) {
 818         unsigned int i;
 819
 820         for(i = 0; i < LENGTH(tags); i++)
 821                 if(c->tags[i])
 822                         return &views[c->tags[i] - 1];
 823         return &views[0]; /* fallback */
 824 }
 825
 826 long
 827 getstate(Window w) {
 828         int format, status;
 829         long result = -1;
 830         unsigned char *p = NULL;
 831         unsigned long n, extra;
 832         Atom real;
 833
 834         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 835                         &real, &format, &n, &extra, (unsigned char **)&p);
 836         if(status != Success)
 837                 return -1;
 838         if(n != 0)
 839                 result = *p;
 840         XFree(p);
 841         return result;
 842 }
 843
 844 Bool
 845 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 846         char **list = NULL;
 847         int n;
 848         XTextProperty name;
 849
 850         if(!text || size == 0)
 851                 return False;
 852         text[0] = '\0';
 853         XGetTextProperty(dpy, w, &name, atom);
 854         if(!name.nitems)
 855                 return False;
 856         if(name.encoding == XA_STRING)
 857                 strncpy(text, (char *)name.value, size - 1);
 858         else {
 859                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 860                 && n > 0 && *list) {
 861                         strncpy(text, *list, size - 1);
 862                         XFreeStringList(list);
 863                 }
 864         }
 865         text[size - 1] = '\0';
 866         XFree(name.value);
 867         return True;
 868 }
 869
 870 void
 871 grabbuttons(Client *c, Bool focused) {
 872         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 873
 874         if(focused) {
 875                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 876                                 GrabModeAsync, GrabModeSync, None, None);
 877                 XGrabButton(dpy, Button1, MODKEY|LockMask, c->win, False, BUTTONMASK,
 878                                 GrabModeAsync, GrabModeSync, None, None);
 879                 XGrabButton(dpy, Button1, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 880                                 GrabModeAsync, GrabModeSync, None, None);
 881                 XGrabButton(dpy, Button1, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 882                                 GrabModeAsync, GrabModeSync, None, None);
 883
 884                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 885                                 GrabModeAsync, GrabModeSync, None, None);
 886                 XGrabButton(dpy, Button2, MODKEY|LockMask, c->win, False, BUTTONMASK,
 887                                 GrabModeAsync, GrabModeSync, None, None);
 888                 XGrabButton(dpy, Button2, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 889                                 GrabModeAsync, GrabModeSync, None, None);
 890                 XGrabButton(dpy, Button2, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 891                                 GrabModeAsync, GrabModeSync, None, None);
 892
 893                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 894                                 GrabModeAsync, GrabModeSync, None, None);
 895                 XGrabButton(dpy, Button3, MODKEY|LockMask, c->win, False, BUTTONMASK,
 896                                 GrabModeAsync, GrabModeSync, None, None);
 897                 XGrabButton(dpy, Button3, MODKEY|numlockmask, c->win, False, BUTTONMASK,
 898                                 GrabModeAsync, GrabModeSync, None, None);
 899                 XGrabButton(dpy, Button3, MODKEY|numlockmask|LockMask, c->win, False, BUTTONMASK,
 900                                 GrabModeAsync, GrabModeSync, None, None);
 901         }
 902         else
 903                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 904                                 GrabModeAsync, GrabModeSync, None, None);
 905 }
 906
 907 void
 908 grabkeys(void)  {
 909         unsigned int i, j;
 910         KeyCode code;
 911         XModifierKeymap *modmap;
 912
 913         /* init modifier map */
 914         modmap = XGetModifierMapping(dpy);
 915         for(i = 0; i < 8; i++)
 916                 for(j = 0; j < modmap->max_keypermod; j++) {
 917                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 918                                 numlockmask = (1 << i);
 919                 }
 920         XFreeModifiermap(modmap);
 921
 922         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 923         for(i = 0; i < LENGTH(keys); i++) {
 924                 code = XKeysymToKeycode(dpy, keys[i].keysym);
 925                 XGrabKey(dpy, code, keys[i].mod, root, True,
 926                                 GrabModeAsync, GrabModeAsync);
 927                 XGrabKey(dpy, code, keys[i].mod|LockMask, root, True,
 928                                 GrabModeAsync, GrabModeAsync);
 929                 XGrabKey(dpy, code, keys[i].mod|numlockmask, root, True,
 930                                 GrabModeAsync, GrabModeAsync);
 931                 XGrabKey(dpy, code, keys[i].mod|numlockmask|LockMask, root, True,
 932                                 GrabModeAsync, GrabModeAsync);
 933         }
 934 }
 935
 936 unsigned int
 937 idxoftag(const char *tag) {
 938         unsigned int i;
 939
 940         for(i = 0; (i < LENGTH(tags)) && (tags[i] != tag); i++);
 941         return (i < LENGTH(tags)) ? i : 0;
 942 }
 943
 944 void
 945 initfont(const char *fontstr) {
 946         char *def, **missing;
 947         int i, n;
 948
 949         missing = NULL;
 950         if(dc.font.set)
 951                 XFreeFontSet(dpy, dc.font.set);
 952         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 953         if(missing) {
 954                 while(n--)
 955                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 956                 XFreeStringList(missing);
 957         }
 958         if(dc.font.set) {
 959                 XFontSetExtents *font_extents;
 960                 XFontStruct **xfonts;
 961                 char **font_names;
 962                 dc.font.ascent = dc.font.descent = 0;
 963                 font_extents = XExtentsOfFontSet(dc.font.set);
 964                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 965                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 966                         if(dc.font.ascent < (*xfonts)->ascent)
 967                                 dc.font.ascent = (*xfonts)->ascent;
 968                         if(dc.font.descent < (*xfonts)->descent)
 969                                 dc.font.descent = (*xfonts)->descent;
 970                         xfonts++;
 971                 }
 972         }
 973         else {
 974                 if(dc.font.xfont)
 975                         XFreeFont(dpy, dc.font.xfont);
 976                 dc.font.xfont = NULL;
 977                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 978                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 979                         eprint("error, cannot load font: '%s'\n", fontstr);
 980                 dc.font.ascent = dc.font.xfont->ascent;
 981                 dc.font.descent = dc.font.xfont->descent;
 982         }
 983         dc.font.height = dc.font.ascent + dc.font.descent;
 984 }
 985
 986 Bool
 987 isoccupied(unsigned int t) {
 988         Client *c;
 989
 990         for(c = clients; c; c = c->next)
 991                 if(c->tags[t])
 992                         return True;
 993         return False;
 994 }
 995
 996 Bool
 997 isprotodel(Client *c) {
 998         int i, n;
 999         Atom *protocols;
1000         Bool ret = False;
1001
1002         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1003                 for(i = 0; !ret && i < n; i++)
1004                         if(protocols[i] == wmatom[WMDelete])
1005                                 ret = True;
1006                 XFree(protocols);
1007         }
1008         return ret;
1009 }
1010
1011 Bool
1012 isurgent(unsigned int t) {
1013         Client *c;
1014
1015         for(c = clients; c; c = c->next)
1016                 if(c->isurgent && c->tags[t])
1017                         return True;
1018         return False;
1019 }
1020
1021 Bool
1022 isvisible(Client *c) {
1023         unsigned int i;
1024
1025         for(i = 0; i < LENGTH(tags); i++)
1026                 if(c->tags[i] && seltags[i])
1027                         return True;
1028         return False;
1029 }
1030
1031 void
1032 keypress(XEvent *e) {
1033         unsigned int i;
1034         KeySym keysym;
1035         XKeyEvent *ev;
1036
1037         ev = &e->xkey;
1038         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1039         for(i = 0; i < LENGTH(keys); i++)
1040                 if(keysym == keys[i].keysym
1041                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
1042                 {
1043                         if(keys[i].func)
1044                                 keys[i].func(keys[i].arg);
1045                 }
1046 }
1047
1048 void
1049 killclient(const char *arg) {
1050         XEvent ev;
1051
1052         if(!sel)
1053                 return;
1054         if(isprotodel(sel)) {
1055                 ev.type = ClientMessage;
1056                 ev.xclient.window = sel->win;
1057                 ev.xclient.message_type = wmatom[WMProtocols];
1058                 ev.xclient.format = 32;
1059                 ev.xclient.data.l[0] = wmatom[WMDelete];
1060                 ev.xclient.data.l[1] = CurrentTime;
1061                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
1062         }
1063         else
1064                 XKillClient(dpy, sel->win);
1065 }
1066
1067 void
1068 manage(Window w, XWindowAttributes *wa) {
1069         Client *c, *t = NULL;
1070         View *v;
1071         Status rettrans;
1072         Window trans;
1073         XWindowChanges wc;
1074
1075         c = emallocz(sizeof(Client));
1076         c->tags = emallocz(sizeof initags);
1077         c->win = w;
1078
1079         applyrules(c);
1080
1081         v = getview(c);
1082
1083         c->x = wa->x + v->x;
1084         c->y = wa->y + v->y;
1085         c->w = wa->width;
1086         c->h = wa->height;
1087         c->oldborder = wa->border_width;
1088
1089         if(c->w == v->w && c->h == v->h) {
1090                 c->x = v->x;
1091                 c->y = v->y;
1092                 c->border = wa->border_width;
1093         }
1094         else {
1095                 if(c->x + c->w + 2 * c->border > v->wax + v->waw)
1096                         c->x = v->wax + v->waw - c->w - 2 * c->border;
1097                 if(c->y + c->h + 2 * c->border > v->way + v->wah)
1098                         c->y = v->way + v->wah - c->h - 2 * c->border;
1099                 if(c->x < v->wax)
1100                         c->x = v->wax;
1101                 if(c->y < v->way)
1102                         c->y = v->way;
1103                 c->border = BORDERPX;
1104         }
1105         wc.border_width = c->border;
1106         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1107         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1108         configure(c); /* propagates border_width, if size doesn't change */
1109         updatesizehints(c);
1110         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1111         grabbuttons(c, False);
1112         updatetitle(c);
1113         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1114                 for(t = clients; t && t->win != trans; t = t->next);
1115         if(t)
1116                 memcpy(c->tags, t->tags, sizeof initags);
1117         if(!c->isfloating)
1118                 c->isfloating = (rettrans == Success) || c->isfixed;
1119         attach(c);
1120         attachstack(c);
1121         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1122         ban(c);
1123         XMapWindow(dpy, c->win);
1124         setclientstate(c, NormalState);
1125         arrange();
1126 }
1127
1128 void
1129 mappingnotify(XEvent *e) {
1130         XMappingEvent *ev = &e->xmapping;
1131
1132         XRefreshKeyboardMapping(ev);
1133         if(ev->request == MappingKeyboard)
1134                 grabkeys();
1135 }
1136
1137 void
1138 maprequest(XEvent *e) {
1139         static XWindowAttributes wa;
1140         XMapRequestEvent *ev = &e->xmaprequest;
1141
1142         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1143                 return;
1144         if(wa.override_redirect)
1145                 return;
1146         if(!getclient(ev->window))
1147                 manage(ev->window, &wa);
1148 }
1149
1150 View *
1151 viewat() {
1152         int i, x, y;
1153         Window win;
1154         unsigned int mask;
1155
1156         XQueryPointer(dpy, root, &win, &win, &x, &y, &i, &i, &mask);
1157         for(i = 0; i < nviews; i++) {
1158                 if((x >= views[i].x && x < views[i].x + views[i].w)
1159                 && (y >= views[i].y && y < views[i].y + views[i].h)) {
1160                         return &views[i];
1161                 }
1162         }
1163         return NULL;
1164 }
1165
1166 void
1167 movemouse(Client *c) {
1168         int x1, y1, ocx, ocy, di, nx, ny;
1169         unsigned int dui;
1170         View *v;
1171         Window dummy;
1172         XEvent ev;
1173
1174         ocx = nx = c->x;
1175         ocy = ny = c->y;
1176         v = getview(c);
1177         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1178                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1179                 return;
1180         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1181         for(;;) {
1182                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1183                 switch (ev.type) {
1184                 case ButtonRelease:
1185                         XUngrabPointer(dpy, CurrentTime);
1186                         return;
1187                 case ConfigureRequest:
1188                 case Expose:
1189                 case MapRequest:
1190                         handler[ev.type](&ev);
1191                         break;
1192                 case MotionNotify:
1193                         XSync(dpy, False);
1194                         nx = ocx + (ev.xmotion.x - x1);
1195                         ny = ocy + (ev.xmotion.y - y1);
1196                         if(abs(v->wax - nx) < SNAP)
1197                                 nx = v->wax;
1198                         else if(abs((v->wax + v->waw) - (nx + c->w + 2 * c->border)) < SNAP)
1199                                 nx = v->wax + v->waw - c->w - 2 * c->border;
1200                         if(abs(v->way - ny) < SNAP)
1201                                 ny = v->way;
1202                         else if(abs((v->way + v->wah) - (ny + c->h + 2 * c->border)) < SNAP)
1203                                 ny = v->way + v->wah - c->h - 2 * c->border;
1204                         if(!c->isfloating && (v->layout->arrange != floating) && (abs(nx - c->x) > SNAP || abs(ny - c->y) > SNAP))
1205                                 togglefloating(NULL);
1206                         if((v->layout->arrange == floating) || c->isfloating)
1207                                 resize(c, nx, ny, c->w, c->h, False);
1208                         break;
1209                 }
1210         }
1211 }
1212
1213 Client *
1214 nexttiled(Client *c, View *v) {
1215         for(; c && (c->isfloating || getview(c) != v || !isvisible(c)); c = c->next);
1216         return c;
1217 }
1218
1219 void
1220 propertynotify(XEvent *e) {
1221         Client *c;
1222         Window trans;
1223         XPropertyEvent *ev = &e->xproperty;
1224
1225         if(ev->state == PropertyDelete)
1226                 return; /* ignore */
1227         if((c = getclient(ev->window))) {
1228                 switch (ev->atom) {
1229                 default: break;
1230                 case XA_WM_TRANSIENT_FOR:
1231                         XGetTransientForHint(dpy, c->win, &trans);
1232                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1233                                 arrange();
1234                         break;
1235                 case XA_WM_NORMAL_HINTS:
1236                         updatesizehints(c);
1237                         break;
1238                 case XA_WM_HINTS:
1239                         updatewmhints(c);
1240                         drawbar(getview(c));
1241                         break;
1242                 }
1243                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1244                         updatetitle(c);
1245                         if(c == sel)
1246                                 drawbar(selview);
1247                 }
1248         }
1249 }
1250
1251 void
1252 quit(const char *arg) {
1253         readin = running = False;
1254 }
1255
1256 void
1257 reapply(const char *arg) {
1258         static Bool zerotags[LENGTH(tags)] = { 0 };
1259         Client *c;
1260
1261         for(c = clients; c; c = c->next) {
1262                 memcpy(c->tags, zerotags, sizeof zerotags);
1263                 applyrules(c);
1264         }
1265         arrange();
1266 }
1267
1268 void
1269 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1270         View *v;
1271         XWindowChanges wc;
1272
1273         v = getview(c);
1274         if(sizehints) {
1275                 /* set minimum possible */
1276                 if (w < 1)
1277                         w = 1;
1278                 if (h < 1)
1279                         h = 1;
1280
1281                 /* temporarily remove base dimensions */
1282                 w -= c->basew;
1283                 h -= c->baseh;
1284
1285                 /* adjust for aspect limits */
1286                 if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1287                         if (w * c->maxay > h * c->maxax)
1288                                 w = h * c->maxax / c->maxay;
1289                         else if (w * c->minay < h * c->minax)
1290                                 h = w * c->minay / c->minax;
1291                 }
1292
1293                 /* adjust for increment value */
1294                 if(c->incw)
1295                         w -= w % c->incw;
1296                 if(c->inch)
1297                         h -= h % c->inch;
1298
1299                 /* restore base dimensions */
1300                 w += c->basew;
1301                 h += c->baseh;
1302
1303                 if(c->minw > 0 && w < c->minw)
1304                         w = c->minw;
1305                 if(c->minh > 0 && h < c->minh)
1306                         h = c->minh;
1307                 if(c->maxw > 0 && w > c->maxw)
1308                         w = c->maxw;
1309                 if(c->maxh > 0 && h > c->maxh)
1310                         h = c->maxh;
1311         }
1312         if(w <= 0 || h <= 0)
1313                 return;
1314         if(x > v->x + v->w)
1315                 x = v->w - w - 2 * c->border;
1316         if(y > v->y + v->h)
1317                 y = v->h - h - 2 * c->border;
1318         if(x + w + 2 * c->border < v->x)
1319                 x = v->x;
1320         if(y + h + 2 * c->border < v->y)
1321                 y = v->y;
1322         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1323                 c->x = wc.x = x;
1324                 c->y = wc.y = y;
1325                 c->w = wc.width = w;
1326                 c->h = wc.height = h;
1327                 wc.border_width = c->border;
1328                 XConfigureWindow(dpy, c->win,
1329                                 CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1330                 configure(c);
1331                 XSync(dpy, False);
1332         }
1333 }
1334
1335 void
1336 resizemouse(Client *c) {
1337         int ocx, ocy;
1338         int nw, nh;
1339         View *v;
1340         XEvent ev;
1341
1342         ocx = c->x;
1343         ocy = c->y;
1344         v = getview(c);
1345         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1346                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1347                 return;
1348         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1349         for(;;) {
1350                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask , &ev);
1351                 switch(ev.type) {
1352                 case ButtonRelease:
1353                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1354                                         c->w + c->border - 1, c->h + c->border - 1);
1355                         XUngrabPointer(dpy, CurrentTime);
1356                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1357                         return;
1358                 case ConfigureRequest:
1359                 case Expose:
1360                 case MapRequest:
1361                         handler[ev.type](&ev);
1362                         break;
1363                 case MotionNotify:
1364                         XSync(dpy, False);
1365                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1366                                 nw = 1;
1367                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1368                                 nh = 1;
1369                         if(!c->isfloating && (v->layout->arrange != floating) && (abs(nw - c->w) > SNAP || abs(nh - c->h) > SNAP))
1370                                 togglefloating(NULL);
1371                         if((v->layout->arrange == floating) || c->isfloating)
1372                                 resize(c, c->x, c->y, nw, nh, True);
1373                         break;
1374                 }
1375         }
1376 }
1377
1378 void
1379 restack(View *v) {
1380         Client *c;
1381         XEvent ev;
1382         XWindowChanges wc;
1383
1384         drawbar(v);
1385         if(!sel)
1386                 return;
1387         if(sel->isfloating || (v->layout->arrange == floating))
1388                 XRaiseWindow(dpy, sel->win);
1389         if(v->layout->arrange != floating) {
1390                 wc.stack_mode = Below;
1391                 wc.sibling = v->barwin;
1392                 if(!sel->isfloating) {
1393                         XConfigureWindow(dpy, sel->win, CWSibling|CWStackMode, &wc);
1394                         wc.sibling = sel->win;
1395                 }
1396                 for(c = nexttiled(clients, v); c; c = nexttiled(c->next, v)) {
1397                         if(c == sel)
1398                                 continue;
1399                         XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1400                         wc.sibling = c->win;
1401                 }
1402         }
1403         XSync(dpy, False);
1404         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1405 }
1406
1407 void
1408 run(void) {
1409         char *p;
1410         char buf[sizeof stext];
1411         fd_set rd;
1412         int r, xfd;
1413         unsigned int len, offset;
1414         XEvent ev;
1415
1416         /* main event loop, also reads status text from stdin */
1417         XSync(dpy, False);
1418         xfd = ConnectionNumber(dpy);
1419         readin = True;
1420         offset = 0;
1421         len = sizeof stext - 1;
1422         buf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
1423         while(running) {
1424                 FD_ZERO(&rd);
1425                 if(readin)
1426                         FD_SET(STDIN_FILENO, &rd);
1427                 FD_SET(xfd, &rd);
1428                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1429                         if(errno == EINTR)
1430                                 continue;
1431                         eprint("select failed\n");
1432                 }
1433                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1434                         switch((r = read(STDIN_FILENO, buf + offset, len - offset))) {
1435                         case -1:
1436                                 strncpy(stext, strerror(errno), len);
1437                                 readin = False;
1438                                 break;
1439                         case 0:
1440                                 strncpy(stext, "EOF", 4);
1441                                 readin = False;
1442                                 break;
1443                         default:
1444                                 for(p = buf + offset; r > 0; p++, r--, offset++)
1445                                         if(*p == '\n' || *p == '\0') {
1446                                                 *p = '\0';
1447                                                 strncpy(stext, buf, len);
1448                                                 p += r - 1; /* p is buf + offset + r - 1 */
1449                                                 for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
1450                                                 offset = r;
1451                                                 if(r)
1452                                                         memmove(buf, p - r + 1, r);
1453                                                 break;
1454                                         }
1455                                 break;
1456                         }
1457                         drawbar(selview);
1458                 }
1459                 while(XPending(dpy)) {
1460                         XNextEvent(dpy, &ev);
1461                         if(handler[ev.type])
1462                                 (handler[ev.type])(&ev); /* call handler */
1463                 }
1464         }
1465 }
1466
1467 void
1468 scan(void) {
1469         unsigned int i, num;
1470         Window *wins, d1, d2;
1471         XWindowAttributes wa;
1472
1473         wins = NULL;
1474         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1475                 for(i = 0; i < num; i++) {
1476                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1477                                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1478                                 continue;
1479                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1480                                 manage(wins[i], &wa);
1481                 }
1482                 for(i = 0; i < num; i++) { /* now the transients */
1483                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1484                                 continue;
1485                         if(XGetTransientForHint(dpy, wins[i], &d1)
1486                                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1487                                 manage(wins[i], &wa);
1488                 }
1489         }
1490         if(wins)
1491                 XFree(wins);
1492 }
1493
1494 void
1495 setclientstate(Client *c, long state) {
1496         long data[] = {state, None};
1497
1498         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1499                         PropModeReplace, (unsigned char *)data, 2);
1500 }
1501
1502 void
1503 setlayout(const char *arg) {
1504         unsigned int i;
1505         View *v = selview;
1506
1507         if(!arg) {
1508                 v->layout++;
1509                 if(v->layout == &layouts[LENGTH(layouts)])
1510                         v->layout = &layouts[0];
1511         }
1512         else {
1513                 for(i = 0; i < LENGTH(layouts); i++)
1514                         if(!strcmp(arg, layouts[i].symbol))
1515                                 break;
1516                 if(i == LENGTH(layouts))
1517                         return;
1518                 v->layout = &layouts[i];
1519         }
1520         if(sel)
1521                 arrange();
1522         else
1523                 drawbar(v);
1524 }
1525
1526 void
1527 setmwfact(const char *arg) {
1528         double delta;
1529
1530         View *v = selview;
1531
1532         if(!domwfact)
1533                 return;
1534         /* arg handling, manipulate mwfact */
1535         if(arg == NULL)
1536                 v->mwfact = MWFACT;
1537         else if(sscanf(arg, "%lf", &delta) == 1) {
1538                 if(arg[0] == '+' || arg[0] == '-')
1539                         v->mwfact += delta;
1540                 else
1541                         v->mwfact = delta;
1542                 if(v->mwfact < 0.1)
1543                         v->mwfact = 0.1;
1544                 else if(v->mwfact > 0.9)
1545                         v->mwfact = 0.9;
1546         }
1547         arrange();
1548 }
1549
1550 void
1551 setup(void) {
1552         unsigned int i;
1553         View *v;
1554         XSetWindowAttributes wa;
1555         XineramaScreenInfo *info = NULL;
1556
1557         /* init atoms */
1558         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1559         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1560         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1561         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1562         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1563         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1564
1565         /* init cursors */
1566         wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1567         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1568         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1569
1570         if((isxinerama = XineramaIsActive(dpy)))
1571                 info = XineramaQueryScreens(dpy, &nviews);
1572 #if defined(AIM_XINERAMA)
1573 isxinerama = True;
1574 nviews = 2; /* aim Xinerama */
1575 #endif
1576         selview = views = emallocz(nviews * sizeof(View));
1577
1578         screen = DefaultScreen(dpy);
1579         root = RootWindow(dpy, screen);
1580
1581         /* init appearance */
1582         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1583         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1584         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1585         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1586         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1587         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1588         initfont(FONT);
1589         dc.h = bh = dc.font.height + 2;
1590         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1591         dc.gc = XCreateGC(dpy, root, 0, 0);
1592         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1593         if(!dc.font.set)
1594                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1595
1596         for(blw = i = 0; i < LENGTH(layouts); i++) {
1597                 i = textw(layouts[i].symbol);
1598                 if(i > blw)
1599                         blw = i;
1600         }
1601
1602         seltags = emallocz(sizeof initags);
1603         prevtags = emallocz(sizeof initags);
1604         memcpy(seltags, initags, sizeof initags);
1605         memcpy(prevtags, initags, sizeof initags);
1606
1607         for(i = 0; i < nviews; i++) {
1608                 /* init geometry */
1609                 v = &views[i];
1610                 v->id = i + 1;
1611
1612                 if(nviews != 1 && isxinerama) {
1613
1614 #if defined(AIM_XINERAMA)
1615 v->w = DisplayWidth(dpy, screen) / 2;
1616 v->x = (i == 0) ? 0 : v->w;
1617 v->y = 0;
1618 v->h = DisplayHeight(dpy, screen);
1619 #else
1620                         v->x = info[i].x_org;
1621                         v->y = info[i].y_org;
1622                         v->w = info[i].width;
1623                         v->h = info[i].height;
1624 #endif
1625                 }
1626                 else {
1627                         v->x = 0;
1628                         v->y = 0;
1629                         v->w = DisplayWidth(dpy, screen);
1630                         v->h = DisplayHeight(dpy, screen);
1631                 }
1632
1633                 /* init layouts */
1634                 v->mwfact = MWFACT;
1635                 v->layout = &layouts[0];
1636
1637                 // TODO: bpos per screen?
1638                 bpos = BARPOS;
1639                 wa.override_redirect = 1;
1640                 wa.background_pixmap = ParentRelative;
1641                 wa.event_mask = ButtonPressMask|ExposureMask;
1642
1643                 /* init bars */
1644                 v->barwin = XCreateWindow(dpy, root, v->x, v->y, v->w, bh, 0,
1645                                 DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1646                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1647                 XDefineCursor(dpy, v->barwin, cursor[CurNormal]);
1648                 updatebarpos(v);
1649                 XMapRaised(dpy, v->barwin);
1650                 strcpy(stext, "dwm-"VERSION);
1651
1652                 /* EWMH support per view */
1653                 XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1654                                 PropModeReplace, (unsigned char *) netatom, NetLast);
1655
1656                 /* select for events */
1657                 wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1658                                 |EnterWindowMask|LeaveWindowMask|StructureNotifyMask;
1659                 XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1660                 XSelectInput(dpy, root, wa.event_mask);
1661
1662                 drawbar(v);
1663         }
1664         if(info)
1665                 XFree(info);
1666
1667         /* grab keys */
1668         grabkeys();
1669
1670         /* init tags */
1671         compileregs();
1672
1673         selview = &views[0];
1674 }
1675
1676 void
1677 spawn(const char *arg) {
1678         static char *shell = NULL;
1679
1680         if(!shell && !(shell = getenv("SHELL")))
1681                 shell = "/bin/sh";
1682         if(!arg)
1683                 return;
1684         /* The double-fork construct avoids zombie processes and keeps the code
1685          * clean from stupid signal handlers. */
1686         if(fork() == 0) {
1687                 if(fork() == 0) {
1688                         if(dpy)
1689                                 close(ConnectionNumber(dpy));
1690                         setsid();
1691                         execl(shell, shell, "-c", arg, (char *)NULL);
1692                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1693                         perror(" failed");
1694                 }
1695                 exit(0);
1696         }
1697         wait(0);
1698 }
1699
1700 void
1701 tag(const char *arg) {
1702         unsigned int i;
1703
1704         if(!sel)
1705                 return;
1706         for(i = 0; i < LENGTH(tags); i++)
1707                 sel->tags[i] = (NULL == arg) ? selview->id : 0;
1708         sel->tags[idxoftag(arg)] = selview->id;
1709         arrange();
1710 }
1711
1712 unsigned int
1713 textnw(const char *text, unsigned int len) {
1714         XRectangle r;
1715
1716         if(dc.font.set) {
1717                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1718                 return r.width;
1719         }
1720         return XTextWidth(dc.font.xfont, text, len);
1721 }
1722
1723 unsigned int
1724 textw(const char *text) {
1725         return textnw(text, strlen(text)) + dc.font.height;
1726 }
1727
1728 void
1729 tile(View *v) {
1730         unsigned int i, n, nx, ny, nw, nh, mw, th;
1731         Client *c, *mc;
1732
1733         domwfact = dozoom = True;
1734         nx = v->wax;
1735         ny = v->way;
1736         nw = 0;
1737         for(n = 0, c = nexttiled(clients, v); c; c = nexttiled(c->next, v))
1738                 n++;
1739
1740         /* window geoms */
1741         mw = (n == 1) ? v->waw : v->mwfact * v->waw;
1742         th = (n > 1) ? v->wah / (n - 1) : 0;
1743         if(n > 1 && th < bh)
1744                 th = v->wah;
1745
1746         for(i = 0, c = mc = nexttiled(clients, v); c; c = nexttiled(c->next, v)) {
1747                 if(i == 0) { /* master */
1748                         nx = v->wax;
1749                         ny = v->way;
1750                         nw = mw - 2 * c->border;
1751                         nh = v->wah - 2 * c->border;
1752                 }
1753                 else {  /* tile window */
1754                         if(i == 1) {
1755                                 ny = v->way;
1756                                 nx += mc->w + 2 * mc->border;
1757                                 nw = v->waw - mw - 2 * c->border;
1758                         }
1759                         if(i + 1 == n) /* remainder */
1760                                 nh = (v->way + v->wah) - ny - 2 * c->border;
1761                         else
1762                                 nh = th - 2 * c->border;
1763                 }
1764                 fprintf(stderr, "tile %d %d %d %d\n", nx, ny, nw, nh);
1765                 resize(c, nx, ny, nw, nh, RESIZEHINTS);
1766                 if((RESIZEHINTS) && ((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw)))
1767                         /* client doesn't accept size constraints */
1768                         resize(c, nx, ny, nw, nh, False);
1769                 if(n > 1 && th != v->wah)
1770                         ny = c->y + c->h + 2 * c->border;
1771                 i++;
1772         }
1773 }
1774
1775 void
1776 togglebar(const char *arg) {
1777         if(bpos == BarOff)
1778                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1779         else
1780                 bpos = BarOff;
1781         updatebarpos(selview);
1782         arrange();
1783 }
1784
1785 void
1786 togglefloating(const char *arg) {
1787         if(!sel)
1788                 return;
1789         sel->isfloating = !sel->isfloating;
1790         if(sel->isfloating)
1791                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1792         arrange();
1793 }
1794
1795 void
1796 toggletag(const char *arg) {
1797         unsigned int i, j;
1798
1799         if(!sel)
1800                 return;
1801         i = idxoftag(arg);
1802         sel->tags[i] = !sel->tags[i];
1803         for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
1804         if(j == LENGTH(tags))
1805                 sel->tags[i] = selview->id; /* at least one tag must be enabled */
1806         arrange();
1807 }
1808
1809 void
1810 toggleview(const char *arg) {
1811         unsigned int i, j;
1812
1813         i = idxoftag(arg);
1814         seltags[i] = !seltags[i];
1815         for(j = 0; j < LENGTH(tags) && !seltags[j]; j++);
1816         if(j == LENGTH(tags))
1817                 seltags[i] = selview->id; /* at least one tag must be viewed */
1818         arrange();
1819 }
1820
1821 void
1822 unban(Client *c) {
1823         if(!c->isbanned)
1824                 return;
1825         XMoveWindow(dpy, c->win, c->x, c->y);
1826         c->isbanned = False;
1827 }
1828
1829 void
1830 unmanage(Client *c) {
1831         XWindowChanges wc;
1832
1833         wc.border_width = c->oldborder;
1834         /* The server grab construct avoids race conditions. */
1835         XGrabServer(dpy);
1836         XSetErrorHandler(xerrordummy);
1837         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1838         detach(c);
1839         detachstack(c);
1840         if(sel == c)
1841                 focus(NULL);
1842         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1843         setclientstate(c, WithdrawnState);
1844         free(c->tags);
1845         free(c);
1846         XSync(dpy, False);
1847         XSetErrorHandler(xerror);
1848         XUngrabServer(dpy);
1849         arrange();
1850 }
1851
1852 void
1853 unmapnotify(XEvent *e) {
1854         Client *c;
1855         XUnmapEvent *ev = &e->xunmap;
1856
1857         if((c = getclient(ev->window)))
1858                 unmanage(c);
1859 }
1860
1861 void
1862 updatebarpos(View *v) {
1863         XEvent ev;
1864
1865         v->wax = v->x;
1866         v->way = v->y;
1867         v->wah = v->h;
1868         v->waw = v->w;
1869         switch(bpos) {
1870         default:
1871                 v->wah -= bh;
1872                 v->way += bh;
1873                 XMoveWindow(dpy, v->barwin, v->x, v->y);
1874                 break;
1875         case BarBot:
1876                 v->wah -= bh;
1877                 XMoveWindow(dpy, v->barwin, v->x, v->y + v->wah);
1878                 break;
1879         case BarOff:
1880                 XMoveWindow(dpy, v->barwin, v->x, v->y - bh);
1881                 break;
1882         }
1883         XSync(dpy, False);
1884         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1885 }
1886
1887 void
1888 updatesizehints(Client *c) {
1889         long msize;
1890         XSizeHints size;
1891
1892         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1893                 size.flags = PSize;
1894         c->flags = size.flags;
1895         if(c->flags & PBaseSize) {
1896                 c->basew = size.base_width;
1897                 c->baseh = size.base_height;
1898         }
1899         else if(c->flags & PMinSize) {
1900                 c->basew = size.min_width;
1901                 c->baseh = size.min_height;
1902         }
1903         else
1904                 c->basew = c->baseh = 0;
1905         if(c->flags & PResizeInc) {
1906                 c->incw = size.width_inc;
1907                 c->inch = size.height_inc;
1908         }
1909         else
1910                 c->incw = c->inch = 0;
1911         if(c->flags & PMaxSize) {
1912                 c->maxw = size.max_width;
1913                 c->maxh = size.max_height;
1914         }
1915         else
1916                 c->maxw = c->maxh = 0;
1917         if(c->flags & PMinSize) {
1918                 c->minw = size.min_width;
1919                 c->minh = size.min_height;
1920         }
1921         else if(c->flags & PBaseSize) {
1922                 c->minw = size.base_width;
1923                 c->minh = size.base_height;
1924         }
1925         else
1926                 c->minw = c->minh = 0;
1927         if(c->flags & PAspect) {
1928                 c->minax = size.min_aspect.x;
1929                 c->maxax = size.max_aspect.x;
1930                 c->minay = size.min_aspect.y;
1931                 c->maxay = size.max_aspect.y;
1932         }
1933         else
1934                 c->minax = c->maxax = c->minay = c->maxay = 0;
1935         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1936                         && c->maxw == c->minw && c->maxh == c->minh);
1937 }
1938
1939 void
1940 updatetitle(Client *c) {
1941         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1942                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1943 }
1944
1945 void
1946 updatewmhints(Client *c) {
1947         XWMHints *wmh;
1948
1949         if((wmh = XGetWMHints(dpy, c->win))) {
1950                 c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1951                 XFree(wmh);
1952         }
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 view(const char *arg) {
1989         unsigned int i;
1990         int tmp[LENGTH(tags)];
1991
1992         for(i = 0; i < LENGTH(tags); i++)
1993                 tmp[i] = (NULL == arg) ? selview->id : 0;
1994         tmp[idxoftag(arg)] = selview->id;
1995         if(memcmp(seltags, tmp, sizeof initags) != 0) {
1996                 memcpy(prevtags, seltags, sizeof initags);
1997                 memcpy(seltags, tmp, sizeof initags);
1998                 arrange();
1999         }
2000 }
2001
2002 void
2003 viewprevtag(const char *arg) {
2004         static Bool tmp[LENGTH(tags)];
2005
2006         memcpy(tmp, seltags, sizeof initags);
2007         memcpy(seltags, prevtags, sizeof initags);
2008         memcpy(prevtags, tmp, sizeof initags);
2009         arrange();
2010 }
2011
2012 void
2013 zoom(const char *arg) {
2014         Client *c = sel;
2015
2016         if(!sel || !dozoom || sel->isfloating)
2017                 return;
2018         if(c == nexttiled(clients, getview(c)))
2019                 if(!(c = nexttiled(c->next, getview(c))))
2020                         return;
2021         detach(c);
2022         attach(c);
2023         focus(c);
2024         arrange();
2025 }
2026
2027 void
2028 selectview(const char *arg) {
2029         int i;
2030         View *v;
2031
2032         if(!arg)
2033                 return;
2034         if(arg)
2035                 i = atoi(arg);
2036         v = &views[i % nviews];
2037         XWarpPointer(dpy, None, root, 0, 0, 0, 0, v->wax+v->waw/2, v->way+v->wah/2);
2038         focus(NULL);
2039 }
2040
2041
2042 int
2043 main(int argc, char *argv[]) {
2044         if(argc == 2 && !strcmp("-v", argv[1]))
2045                 eprint("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
2046         else if(argc != 1)
2047                 eprint("usage: dwm [-v]\n");
2048
2049         setlocale(LC_CTYPE, "");
2050         if(!(dpy = XOpenDisplay(0)))
2051                 eprint("dwm: cannot open display\n");
2052
2053         checkotherwm();
2054         setup();
2055         scan();
2056         run();
2057         cleanup();
2058
2059         XCloseDisplay(dpy);
2060         return 0;
2061 }