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