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  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  46 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  47 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  48 #define LENGTH(X)               (sizeof X / sizeof X[0])
  49 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  50 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  51 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  52 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  53 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  54 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  55 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  56
  57 /* enums */
  58 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  59 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  60 enum { NetSupported, NetWMName, NetWMState, NetLast };  /* EWMH atoms */
  61 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
  62 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  63        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  64
  65 typedef union {
  66         int i;
  67         unsigned int ui;
  68         float f;
  69         const void *v;
  70 } Arg;
  71
  72 typedef struct {
  73         unsigned int click;
  74         unsigned int mask;
  75         unsigned int button;
  76         void (*func)(const Arg *arg);
  77         const Arg arg;
  78 } Button;
  79
  80 typedef struct Monitor Monitor;
  81 typedef struct Client Client;
  82 struct Client {
  83         char name[256];
  84         float mina, maxa;
  85         int x, y, w, h;
  86         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  87         int bw, oldbw;
  88         unsigned int tags;
  89         Bool isfixed, isfloating, isurgent;
  90         Client *next;
  91         Client *snext;
  92         Monitor *mon;
  93         Window win;
  94 };
  95
  96 typedef struct {
  97         int x, y, w, h;
  98         unsigned long norm[ColLast];
  99         unsigned long sel[ColLast];
 100         Drawable drawable;
 101         GC gc;
 102         struct {
 103                 int ascent;
 104                 int descent;
 105                 int height;
 106                 XFontSet set;
 107                 XFontStruct *xfont;
 108         } font;
 109 } DC; /* draw context */
 110
 111 typedef struct {
 112         unsigned int mod;
 113         KeySym keysym;
 114         void (*func)(const Arg *);
 115         const Arg arg;
 116 } Key;
 117
 118 typedef struct {
 119         const char *symbol;
 120         void (*arrange)(Monitor *);
 121 } Layout;
 122
 123 struct Monitor {
 124         char ltsymbol[16];
 125         float mfact;
 126         int num;
 127         int by;               /* bar geometry */
 128         int mx, my, mw, mh;   /* screen size */
 129         int wx, wy, ww, wh;   /* window area  */
 130         unsigned int seltags;
 131         unsigned int sellt;
 132         unsigned int tagset[2];
 133         Bool showbar;
 134         Bool topbar;
 135         Client *clients;
 136         Client *sel;
 137         Client *stack;
 138         Monitor *next;
 139         Window barwin;
 140         const Layout *lt[2];
 141 };
 142
 143 typedef struct {
 144         const char *class;
 145         const char *instance;
 146         const char *title;
 147         unsigned int tags;
 148         Bool isfloating;
 149         int monitor;
 150 } Rule;
 151
 152 /* function declarations */
 153 static void applyrules(Client *c);
 154 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 155 static void arrange(Monitor *m);
 156 static void arrangemon(Monitor *m);
 157 static void attach(Client *c);
 158 static void attachstack(Client *c);
 159 static void buttonpress(XEvent *e);
 160 static void checkotherwm(void);
 161 static void cleanup(void);
 162 static void cleanupmon(Monitor *mon);
 163 static void clearurgent(Client *c);
 164 static void configure(Client *c);
 165 static void configurenotify(XEvent *e);
 166 static void configurerequest(XEvent *e);
 167 static Monitor *createmon(void);
 168 static void destroynotify(XEvent *e);
 169 static void detach(Client *c);
 170 static void detachstack(Client *c);
 171 static void die(const char *errstr, ...);
 172 static Monitor *dirtomon(int dir);
 173 static void drawbar(Monitor *m);
 174 static void drawbars(void);
 175 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 176 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 177 static void enternotify(XEvent *e);
 178 static void expose(XEvent *e);
 179 static void focus(Client *c);
 180 static void focusin(XEvent *e);
 181 static void focusmon(const Arg *arg);
 182 static void focusstack(const Arg *arg);
 183 static unsigned long getcolor(const char *colstr);
 184 static Bool getrootptr(int *x, int *y);
 185 static long getstate(Window w);
 186 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 187 static void grabbuttons(Client *c, Bool focused);
 188 static void grabkeys(void);
 189 static void initfont(const char *fontstr);
 190 static Bool isprotodel(Client *c);
 191 static void keypress(XEvent *e);
 192 static void killclient(const Arg *arg);
 193 static void manage(Window w, XWindowAttributes *wa);
 194 static void mappingnotify(XEvent *e);
 195 static void maprequest(XEvent *e);
 196 static void monocle(Monitor *m);
 197 static void movemouse(const Arg *arg);
 198 static Client *nexttiled(Client *c);
 199 static Monitor *ptrtomon(int x, int y);
 200 static void propertynotify(XEvent *e);
 201 static void quit(const Arg *arg);
 202 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 203 static void resizemouse(const Arg *arg);
 204 static void restack(Monitor *m);
 205 static void run(void);
 206 static void scan(void);
 207 static void sendmon(Client *c, Monitor *m);
 208 static void setclientstate(Client *c, long state);
 209 static void setlayout(const Arg *arg);
 210 static void setmfact(const Arg *arg);
 211 static void setup(void);
 212 static void showhide(Client *c);
 213 static void sigchld(int unused);
 214 static void spawn(const Arg *arg);
 215 static void tag(const Arg *arg);
 216 static void tagmon(const Arg *arg);
 217 static int textnw(const char *text, unsigned int len);
 218 static void tile(Monitor *);
 219 static void togglebar(const Arg *arg);
 220 static void togglefloating(const Arg *arg);
 221 static void toggletag(const Arg *arg);
 222 static void toggleview(const Arg *arg);
 223 static void unfocus(Client *c);
 224 static void unmanage(Client *c, Bool destroyed);
 225 static void unmapnotify(XEvent *e);
 226 static Bool updategeom(void);
 227 static void updatebarpos(Monitor *m);
 228 static void updatebars(void);
 229 static void updatenumlockmask(void);
 230 static void updatesizehints(Client *c);
 231 static void updatestatus(void);
 232 static void updatetitle(Client *c);
 233 static void updatewmhints(Client *c);
 234 static void view(const Arg *arg);
 235 static Client *wintoclient(Window w);
 236 static Monitor *wintomon(Window w);
 237 static int xerror(Display *dpy, XErrorEvent *ee);
 238 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 239 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 240 static void zoom(const Arg *arg);
 241
 242 /* variables */
 243 static const char broken[] = "broken";
 244 static char stext[256];
 245 static int screen;
 246 static int sw, sh;           /* X display screen geometry width, height */
 247 static int bh, blw = 0;      /* bar geometry */
 248 static int (*xerrorxlib)(Display *, XErrorEvent *);
 249 static unsigned int numlockmask = 0;
 250 static void (*handler[LASTEvent]) (XEvent *) = {
 251         [ButtonPress] = buttonpress,
 252         [ConfigureRequest] = configurerequest,
 253         [ConfigureNotify] = configurenotify,
 254         [DestroyNotify] = destroynotify,
 255         [EnterNotify] = enternotify,
 256         [Expose] = expose,
 257         [FocusIn] = focusin,
 258         [KeyPress] = keypress,
 259         [MappingNotify] = mappingnotify,
 260         [MapRequest] = maprequest,
 261         [PropertyNotify] = propertynotify,
 262         [UnmapNotify] = unmapnotify
 263 };
 264 static Atom wmatom[WMLast], netatom[NetLast];
 265 static Bool otherwm;
 266 static Bool running = True;
 267 static Cursor cursor[CurLast];
 268 static Display *dpy;
 269 static DC dc;
 270 static Monitor *mons = NULL, *selmon = NULL;
 271 static Window root;
 272
 273 /* configuration, allows nested code to access above variables */
 274 #include "config.h"
 275
 276 /* compile-time check if all tags fit into an unsigned int bit array. */
 277 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 278
 279 /* function implementations */
 280 void
 281 applyrules(Client *c) {
 282         const char *class, *instance;
 283         unsigned int i;
 284         const Rule *r;
 285         Monitor *m;
 286         XClassHint ch = { 0 };
 287
 288         /* rule matching */
 289         c->isfloating = c->tags = 0;
 290         if(XGetClassHint(dpy, c->win, &ch)) {
 291                 class = ch.res_class ? ch.res_class : broken;
 292                 instance = ch.res_name ? ch.res_name : broken;
 293                 for(i = 0; i < LENGTH(rules); i++) {
 294                         r = &rules[i];
 295                         if((!r->title || strstr(c->name, r->title))
 296                         && (!r->class || strstr(class, r->class))
 297                         && (!r->instance || strstr(instance, r->instance)))
 298                         {
 299                                 c->isfloating = r->isfloating;
 300                                 c->tags |= r->tags;
 301                                 for(m = mons; m && m->num != r->monitor; m = m->next);
 302                                 if(m)
 303                                         c->mon = m;
 304                         }
 305                 }
 306                 if(ch.res_class)
 307                         XFree(ch.res_class);
 308                 if(ch.res_name)
 309                         XFree(ch.res_name);
 310         }
 311         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 312 }
 313
 314 Bool
 315 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 316         Bool baseismin;
 317         Monitor *m = c->mon;
 318
 319         /* set minimum possible */
 320         *w = MAX(1, *w);
 321         *h = MAX(1, *h);
 322         if(interact) {
 323                 if(*x > sw)
 324                         *x = sw - WIDTH(c);
 325                 if(*y > sh)
 326                         *y = sh - HEIGHT(c);
 327                 if(*x + *w + 2 * c->bw < 0)
 328                         *x = 0;
 329                 if(*y + *h + 2 * c->bw < 0)
 330                         *y = 0;
 331         }
 332         else {
 333                 if(*x > m->mx + m->mw)
 334                         *x = m->mx + m->mw - WIDTH(c);
 335                 if(*y > m->my + m->mh)
 336                         *y = m->my + m->mh - HEIGHT(c);
 337                 if(*x + *w + 2 * c->bw < m->mx)
 338                         *x = m->mx;
 339                 if(*y + *h + 2 * c->bw < m->my)
 340                         *y = m->my;
 341         }
 342         if(*h < bh)
 343                 *h = bh;
 344         if(*w < bh)
 345                 *w = bh;
 346         if(resizehints || c->isfloating) {
 347                 /* see last two sentences in ICCCM 4.1.2.3 */
 348                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 349                 if(!baseismin) { /* temporarily remove base dimensions */
 350                         *w -= c->basew;
 351                         *h -= c->baseh;
 352                 }
 353                 /* adjust for aspect limits */
 354                 if(c->mina > 0 && c->maxa > 0) {
 355                         if(c->maxa < (float)*w / *h)
 356                                 *w = *h * c->maxa + 0.5;
 357                         else if(c->mina < (float)*h / *w)
 358                                 *h = *w * c->mina + 0.5;
 359                 }
 360                 if(baseismin) { /* increment calculation requires this */
 361                         *w -= c->basew;
 362                         *h -= c->baseh;
 363                 }
 364                 /* adjust for increment value */
 365                 if(c->incw)
 366                         *w -= *w % c->incw;
 367                 if(c->inch)
 368                         *h -= *h % c->inch;
 369                 /* restore base dimensions */
 370                 *w += c->basew;
 371                 *h += c->baseh;
 372                 *w = MAX(*w, c->minw);
 373                 *h = MAX(*h, c->minh);
 374                 if(c->maxw)
 375                         *w = MIN(*w, c->maxw);
 376                 if(c->maxh)
 377                         *h = MIN(*h, c->maxh);
 378         }
 379         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 380 }
 381
 382 void
 383 arrange(Monitor *m) {
 384         if(m)
 385                 showhide(m->stack);
 386         else for(m = mons; m; m = m->next)
 387                 showhide(m->stack);
 388         focus(NULL);
 389         if(m)
 390                 arrangemon(m);
 391         else for(m = mons; m; m = m->next)
 392                 arrangemon(m);
 393 }
 394
 395 void
 396 arrangemon(Monitor *m) {
 397         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 398         if(m->lt[m->sellt]->arrange)
 399                 m->lt[m->sellt]->arrange(m);
 400         restack(m);
 401 }
 402
 403 void
 404 attach(Client *c) {
 405         c->next = c->mon->clients;
 406         c->mon->clients = c;
 407 }
 408
 409 void
 410 attachstack(Client *c) {
 411         c->snext = c->mon->stack;
 412         c->mon->stack = c;
 413 }
 414
 415 void
 416 buttonpress(XEvent *e) {
 417         unsigned int i, x, click;
 418         Arg arg = {0};
 419         Client *c;
 420         Monitor *m;
 421         XButtonPressedEvent *ev = &e->xbutton;
 422
 423         click = ClkRootWin;
 424         /* focus monitor if necessary */
 425         if((m = wintomon(ev->window)) && m != selmon) {
 426                 unfocus(selmon->sel);
 427                 selmon = m;
 428                 focus(NULL);
 429         }
 430         if(ev->window == selmon->barwin) {
 431                 i = x = 0;
 432                 do {
 433                         x += TEXTW(tags[i]);
 434                 } while(ev->x >= x && ++i < LENGTH(tags));
 435                 if(i < LENGTH(tags)) {
 436                         click = ClkTagBar;
 437                         arg.ui = 1 << i;
 438                 }
 439                 else if(ev->x < x + blw)
 440                         click = ClkLtSymbol;
 441                 else if(ev->x > selmon->wx + selmon->ww - TEXTW(stext))
 442                         click = ClkStatusText;
 443                 else
 444                         click = ClkWinTitle;
 445         }
 446         else if((c = wintoclient(ev->window))) {
 447                 focus(c);
 448                 click = ClkClientWin;
 449         }
 450         for(i = 0; i < LENGTH(buttons); i++)
 451                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 452                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 453                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 454 }
 455
 456 void
 457 checkotherwm(void) {
 458         otherwm = False;
 459         xerrorxlib = XSetErrorHandler(xerrorstart);
 460         /* this causes an error if some other window manager is running */
 461         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 462         XSync(dpy, False);
 463         if(otherwm)
 464                 die("dwm: another window manager is already running\n");
 465         XSetErrorHandler(xerror);
 466         XSync(dpy, False);
 467 }
 468
 469 void
 470 cleanup(void) {
 471         Arg a = {.ui = ~0};
 472         Layout foo = { "", NULL };
 473         Monitor *m;
 474
 475         view(&a);
 476         selmon->lt[selmon->sellt] = &foo;
 477         for(m = mons; m; m = m->next)
 478                 while(m->stack)
 479                         unmanage(m->stack, False);
 480         if(dc.font.set)
 481                 XFreeFontSet(dpy, dc.font.set);
 482         else
 483                 XFreeFont(dpy, dc.font.xfont);
 484         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 485         XFreePixmap(dpy, dc.drawable);
 486         XFreeGC(dpy, dc.gc);
 487         XFreeCursor(dpy, cursor[CurNormal]);
 488         XFreeCursor(dpy, cursor[CurResize]);
 489         XFreeCursor(dpy, cursor[CurMove]);
 490         while(mons)
 491                 cleanupmon(mons);
 492         XSync(dpy, False);
 493         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 494 }
 495
 496 void
 497 cleanupmon(Monitor *mon) {
 498         Monitor *m;
 499
 500         if(mon == mons)
 501                 mons = mons->next;
 502         else {
 503                 for(m = mons; m && m->next != mon; m = m->next);
 504                 m->next = mon->next;
 505         }
 506         XUnmapWindow(dpy, mon->barwin);
 507         XDestroyWindow(dpy, mon->barwin);
 508         free(mon);
 509 }
 510
 511 void
 512 clearurgent(Client *c) {
 513         XWMHints *wmh;
 514
 515         c->isurgent = False;
 516         if(!(wmh = XGetWMHints(dpy, c->win)))
 517                 return;
 518         wmh->flags &= ~XUrgencyHint;
 519         XSetWMHints(dpy, c->win, wmh);
 520         XFree(wmh);
 521 }
 522
 523 void
 524 configure(Client *c) {
 525         XConfigureEvent ce;
 526
 527         ce.type = ConfigureNotify;
 528         ce.display = dpy;
 529         ce.event = c->win;
 530         ce.window = c->win;
 531         ce.x = c->x;
 532         ce.y = c->y;
 533         ce.width = c->w;
 534         ce.height = c->h;
 535         ce.border_width = c->bw;
 536         ce.above = None;
 537         ce.override_redirect = False;
 538         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 539 }
 540
 541 void
 542 configurenotify(XEvent *e) {
 543         Monitor *m;
 544         XConfigureEvent *ev = &e->xconfigure;
 545
 546         if(ev->window == root) {
 547                 sw = ev->width;
 548                 sh = ev->height;
 549                 if(updategeom()) {
 550                         if(dc.drawable != 0)
 551                                 XFreePixmap(dpy, dc.drawable);
 552                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 553                         updatebars();
 554                         for(m = mons; m; m = m->next)
 555                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 556                         arrange(NULL);
 557                 }
 558         }
 559 }
 560
 561 void
 562 configurerequest(XEvent *e) {
 563         Client *c;
 564         Monitor *m;
 565         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 566         XWindowChanges wc;
 567
 568         if((c = wintoclient(ev->window))) {
 569                 if(ev->value_mask & CWBorderWidth)
 570                         c->bw = ev->border_width;
 571                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 572                         m = c->mon;
 573                         if(ev->value_mask & CWX)
 574                                 c->x = m->mx + ev->x;
 575                         if(ev->value_mask & CWY)
 576                                 c->y = m->my + ev->y;
 577                         if(ev->value_mask & CWWidth)
 578                                 c->w = ev->width;
 579                         if(ev->value_mask & CWHeight)
 580                                 c->h = ev->height;
 581                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 582                                 c->x = m->mx + (m->mw / 2 - c->w / 2); /* center in x direction */
 583                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 584                                 c->y = m->my + (m->mh / 2 - c->h / 2); /* center in y direction */
 585                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 586                                 configure(c);
 587                         if(ISVISIBLE(c))
 588                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 589                 }
 590                 else
 591                         configure(c);
 592         }
 593         else {
 594                 wc.x = ev->x;
 595                 wc.y = ev->y;
 596                 wc.width = ev->width;
 597                 wc.height = ev->height;
 598                 wc.border_width = ev->border_width;
 599                 wc.sibling = ev->above;
 600                 wc.stack_mode = ev->detail;
 601                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 602         }
 603         XSync(dpy, False);
 604 }
 605
 606 Monitor *
 607 createmon(void) {
 608         Monitor *m;
 609
 610         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 611                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 612         m->tagset[0] = m->tagset[1] = 1;
 613         m->mfact = mfact;
 614         m->showbar = showbar;
 615         m->topbar = topbar;
 616         m->lt[0] = &layouts[0];
 617         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 618         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 619         return m;
 620 }
 621
 622 void
 623 destroynotify(XEvent *e) {
 624         Client *c;
 625         XDestroyWindowEvent *ev = &e->xdestroywindow;
 626
 627         if((c = wintoclient(ev->window)))
 628                 unmanage(c, True);
 629 }
 630
 631 void
 632 detach(Client *c) {
 633         Client **tc;
 634
 635         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 636         *tc = c->next;
 637 }
 638
 639 void
 640 detachstack(Client *c) {
 641         Client **tc, *t;
 642
 643         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 644         *tc = c->snext;
 645
 646         if(c == c->mon->sel) {
 647                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 648                 c->mon->sel = t;
 649         }
 650 }
 651
 652 void
 653 die(const char *errstr, ...) {
 654         va_list ap;
 655
 656         va_start(ap, errstr);
 657         vfprintf(stderr, errstr, ap);
 658         va_end(ap);
 659         exit(EXIT_FAILURE);
 660 }
 661
 662 Monitor *
 663 dirtomon(int dir) {
 664         Monitor *m = NULL;
 665
 666         if(dir > 0) {
 667                 if(!(m = selmon->next))
 668                         m = mons;
 669         }
 670         else {
 671                 if(selmon == mons)
 672                         for(m = mons; m->next; m = m->next);
 673                 else
 674                         for(m = mons; m->next != selmon; m = m->next);
 675         }
 676         return m;
 677 }
 678
 679 void
 680 drawbar(Monitor *m) {
 681         int x;
 682         unsigned int i, occ = 0, urg = 0;
 683         unsigned long *col;
 684         Client *c;
 685
 686         for(c = m->clients; c; c = c->next) {
 687                 occ |= c->tags;
 688                 if(c->isurgent)
 689                         urg |= c->tags;
 690         }
 691         dc.x = 0;
 692         for(i = 0; i < LENGTH(tags); i++) {
 693                 dc.w = TEXTW(tags[i]);
 694                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 695                 drawtext(tags[i], col, urg & 1 << i);
 696                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 697                            occ & 1 << i, urg & 1 << i, col);
 698                 dc.x += dc.w;
 699         }
 700         dc.w = blw = TEXTW(m->ltsymbol);
 701         drawtext(m->ltsymbol, dc.norm, False);
 702         dc.x += dc.w;
 703         x = dc.x;
 704         if(m == selmon) { /* status is only drawn on selected monitor */
 705                 dc.w = TEXTW(stext);
 706                 dc.x = m->ww - dc.w;
 707                 if(dc.x < x) {
 708                         dc.x = x;
 709                         dc.w = m->ww - x;
 710                 }
 711                 drawtext(stext, dc.norm, False);
 712         }
 713         else
 714                 dc.x = m->ww;
 715         if((dc.w = dc.x - x) > bh) {
 716                 dc.x = x;
 717                 if(m->sel) {
 718                         col = m == selmon ? dc.sel : dc.norm;
 719                         drawtext(m->sel->name, col, False);
 720                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 721                 }
 722                 else
 723                         drawtext(NULL, dc.norm, False);
 724         }
 725         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 726         XSync(dpy, False);
 727 }
 728
 729 void
 730 drawbars(void) {
 731         Monitor *m;
 732
 733         for(m = mons; m; m = m->next)
 734                 drawbar(m);
 735 }
 736
 737 void
 738 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 739         int x;
 740         XGCValues gcv;
 741         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 742
 743         gcv.foreground = col[invert ? ColBG : ColFG];
 744         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 745         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 746         r.x = dc.x + 1;
 747         r.y = dc.y + 1;
 748         if(filled) {
 749                 r.width = r.height = x + 1;
 750                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 751         }
 752         else if(empty) {
 753                 r.width = r.height = x;
 754                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 755         }
 756 }
 757
 758 void
 759 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 760         char buf[256];
 761         int i, x, y, h, len, olen;
 762         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 763
 764         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 765         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 766         if(!text)
 767                 return;
 768         olen = strlen(text);
 769         h = dc.font.ascent + dc.font.descent;
 770         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 771         x = dc.x + (h / 2);
 772         /* shorten text if necessary */
 773         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 774         if(!len)
 775                 return;
 776         memcpy(buf, text, len);
 777         if(len < olen)
 778                 for(i = len; i && i > len - 3; buf[--i] = '.');
 779         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 780         if(dc.font.set)
 781                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 782         else
 783                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 784 }
 785
 786 void
 787 enternotify(XEvent *e) {
 788         Client *c;
 789         Monitor *m;
 790         XCrossingEvent *ev = &e->xcrossing;
 791
 792         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 793                 return;
 794         if((m = wintomon(ev->window)) && m != selmon) {
 795                 unfocus(selmon->sel);
 796                 selmon = m;
 797         }
 798         if((c = wintoclient(ev->window)))
 799                 focus(c);
 800         else
 801                 focus(NULL);
 802 }
 803
 804 void
 805 expose(XEvent *e) {
 806         Monitor *m;
 807         XExposeEvent *ev = &e->xexpose;
 808
 809         if(ev->count == 0 && (m = wintomon(ev->window)))
 810                 drawbar(m);
 811 }
 812
 813 void
 814 focus(Client *c) {
 815         if(!c || !ISVISIBLE(c))
 816                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 817         if(selmon->sel)
 818                 unfocus(selmon->sel);
 819         if(c) {
 820                 if(c->mon != selmon)
 821                         selmon = c->mon;
 822                 if(c->isurgent)
 823                         clearurgent(c);
 824                 detachstack(c);
 825                 attachstack(c);
 826                 grabbuttons(c, True);
 827                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 828                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 829         }
 830         else
 831                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 832         selmon->sel = c;
 833         drawbars();
 834 }
 835
 836 void
 837 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 838         XFocusChangeEvent *ev = &e->xfocus;
 839
 840         if(selmon->sel && ev->window != selmon->sel->win)
 841                 XSetInputFocus(dpy, selmon->sel->win, RevertToPointerRoot, CurrentTime);
 842 }
 843
 844 void
 845 focusmon(const Arg *arg) {
 846         Monitor *m = NULL;
 847
 848         if(!mons->next)
 849                 return;
 850         if((m = dirtomon(arg->i)) == selmon)
 851                 return;
 852         unfocus(selmon->sel);
 853         selmon = m;
 854         focus(NULL);
 855 }
 856
 857 void
 858 focusstack(const Arg *arg) {
 859         Client *c = NULL, *i;
 860
 861         if(!selmon->sel)
 862                 return;
 863         if(arg->i > 0) {
 864                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 865                 if(!c)
 866                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 867         }
 868         else {
 869                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 870                         if(ISVISIBLE(i))
 871                                 c = i;
 872                 if(!c)
 873                         for(; i; i = i->next)
 874                                 if(ISVISIBLE(i))
 875                                         c = i;
 876         }
 877         if(c) {
 878                 focus(c);
 879                 restack(selmon);
 880         }
 881 }
 882
 883 unsigned long
 884 getcolor(const char *colstr) {
 885         Colormap cmap = DefaultColormap(dpy, screen);
 886         XColor color;
 887
 888         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 889                 die("error, cannot allocate color '%s'\n", colstr);
 890         return color.pixel;
 891 }
 892
 893 Bool
 894 getrootptr(int *x, int *y) {
 895         int di;
 896         unsigned int dui;
 897         Window dummy;
 898
 899         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 900 }
 901
 902 long
 903 getstate(Window w) {
 904         int format, status;
 905         long result = -1;
 906         unsigned char *p = NULL;
 907         unsigned long n, extra;
 908         Atom real;
 909
 910         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 911                                     &real, &format, &n, &extra, (unsigned char **)&p);
 912         if(status != Success)
 913                 return -1;
 914         if(n != 0)
 915                 result = *p;
 916         XFree(p);
 917         return result;
 918 }
 919
 920 Bool
 921 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 922         char **list = NULL;
 923         int n;
 924         XTextProperty name;
 925
 926         if(!text || size == 0)
 927                 return False;
 928         text[0] = '\0';
 929         XGetTextProperty(dpy, w, &name, atom);
 930         if(!name.nitems)
 931                 return False;
 932         if(name.encoding == XA_STRING)
 933                 strncpy(text, (char *)name.value, size - 1);
 934         else {
 935                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 936                         strncpy(text, *list, size - 1);
 937                         XFreeStringList(list);
 938                 }
 939         }
 940         text[size - 1] = '\0';
 941         XFree(name.value);
 942         return True;
 943 }
 944
 945 void
 946 grabbuttons(Client *c, Bool focused) {
 947         updatenumlockmask();
 948         {
 949                 unsigned int i, j;
 950                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 951                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 952                 if(focused) {
 953                         for(i = 0; i < LENGTH(buttons); i++)
 954                                 if(buttons[i].click == ClkClientWin)
 955                                         for(j = 0; j < LENGTH(modifiers); j++)
 956                                                 XGrabButton(dpy, buttons[i].button,
 957                                                             buttons[i].mask | modifiers[j],
 958                                                             c->win, False, BUTTONMASK,
 959                                                             GrabModeAsync, GrabModeSync, None, None);
 960                 }
 961                 else
 962                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 963                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 964         }
 965 }
 966
 967 void
 968 grabkeys(void) {
 969         updatenumlockmask();
 970         {
 971                 unsigned int i, j;
 972                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 973                 KeyCode code;
 974
 975                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 976                 for(i = 0; i < LENGTH(keys); i++) {
 977                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 978                                 for(j = 0; j < LENGTH(modifiers); j++)
 979                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 980                                                  True, GrabModeAsync, GrabModeAsync);
 981                 }
 982         }
 983 }
 984
 985 void
 986 initfont(const char *fontstr) {
 987         char *def, **missing;
 988         int i, n;
 989
 990         missing = NULL;
 991         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 992         if(missing) {
 993                 while(n--)
 994                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 995                 XFreeStringList(missing);
 996         }
 997         if(dc.font.set) {
 998                 XFontSetExtents *font_extents;
 999                 XFontStruct **xfonts;
1000                 char **font_names;
1001
1002                 dc.font.ascent = dc.font.descent = 0;
1003                 font_extents = XExtentsOfFontSet(dc.font.set);
1004                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1005                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
1006                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1007                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1008                         xfonts++;
1009                 }
1010         }
1011         else {
1012                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1013                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1014                         die("error, cannot load font: '%s'\n", fontstr);
1015                 dc.font.ascent = dc.font.xfont->ascent;
1016                 dc.font.descent = dc.font.xfont->descent;
1017         }
1018         dc.font.height = dc.font.ascent + dc.font.descent;
1019 }
1020
1021 Bool
1022 isprotodel(Client *c) {
1023         int i, n;
1024         Atom *protocols;
1025         Bool ret = False;
1026
1027         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1028                 for(i = 0; !ret && i < n; i++)
1029                         if(protocols[i] == wmatom[WMDelete])
1030                                 ret = True;
1031                 XFree(protocols);
1032         }
1033         return ret;
1034 }
1035
1036 #ifdef XINERAMA
1037 static Bool
1038 isuniquegeom(XineramaScreenInfo *unique, size_t len, XineramaScreenInfo *info) {
1039         unsigned int i;
1040
1041         for(i = 0; i < len; i++)
1042                 if(unique[i].x_org == info->x_org && unique[i].y_org == info->y_org
1043                 && unique[i].width == info->width && unique[i].height == info->height)
1044                         return False;
1045         return True;
1046 }
1047 #endif /* XINERAMA */
1048
1049 void
1050 keypress(XEvent *e) {
1051         unsigned int i;
1052         KeySym keysym;
1053         XKeyEvent *ev;
1054
1055         ev = &e->xkey;
1056         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1057         for(i = 0; i < LENGTH(keys); i++)
1058                 if(keysym == keys[i].keysym
1059                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1060                 && keys[i].func)
1061                         keys[i].func(&(keys[i].arg));
1062 }
1063
1064 void
1065 killclient(const Arg *arg) {
1066         XEvent ev;
1067
1068         if(!selmon->sel)
1069                 return;
1070         if(isprotodel(selmon->sel)) {
1071                 ev.type = ClientMessage;
1072                 ev.xclient.window = selmon->sel->win;
1073                 ev.xclient.message_type = wmatom[WMProtocols];
1074                 ev.xclient.format = 32;
1075                 ev.xclient.data.l[0] = wmatom[WMDelete];
1076                 ev.xclient.data.l[1] = CurrentTime;
1077                 XSendEvent(dpy, selmon->sel->win, False, NoEventMask, &ev);
1078         }
1079         else {
1080                 XGrabServer(dpy);
1081                 XSetErrorHandler(xerrordummy);
1082                 XSetCloseDownMode(dpy, DestroyAll);
1083                 XKillClient(dpy, selmon->sel->win);
1084                 XSync(dpy, False);
1085                 XSetErrorHandler(xerror);
1086                 XUngrabServer(dpy);
1087         }
1088 }
1089
1090 void
1091 manage(Window w, XWindowAttributes *wa) {
1092         static Client cz;
1093         Client *c, *t = NULL;
1094         Window trans = None;
1095         XWindowChanges wc;
1096
1097         if(!(c = malloc(sizeof(Client))))
1098                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1099         *c = cz;
1100         c->win = w;
1101         updatetitle(c);
1102         if(XGetTransientForHint(dpy, w, &trans))
1103                 t = wintoclient(trans);
1104         if(t) {
1105                 c->mon = t->mon;
1106                 c->tags = t->tags;
1107         }
1108         else {
1109                 c->mon = selmon;
1110                 applyrules(c);
1111         }
1112         /* geometry */
1113         c->x = wa->x + c->mon->wx;
1114         c->y = wa->y + c->mon->wy;
1115         c->w = wa->width;
1116         c->h = wa->height;
1117         c->oldbw = wa->border_width;
1118         if(c->w == c->mon->mw && c->h == c->mon->mh) {
1119                 c->x = c->mon->mx;
1120                 c->y = c->mon->my;
1121                 c->bw = 0;
1122         }
1123         else {
1124                 if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1125                         c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1126                 if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1127                         c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1128                 c->x = MAX(c->x, c->mon->mx);
1129                 /* only fix client y-offset, if the client center might cover the bar */
1130                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1131                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1132                 c->bw = borderpx;
1133         }
1134         wc.border_width = c->bw;
1135         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1136         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1137         configure(c); /* propagates border_width, if size doesn't change */
1138         updatesizehints(c);
1139         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1140         grabbuttons(c, False);
1141         if(!c->isfloating)
1142                 c->isfloating = trans != None || c->isfixed;
1143         if(c->isfloating)
1144                 XRaiseWindow(dpy, c->win);
1145         attach(c);
1146         attachstack(c);
1147         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1148         XMapWindow(dpy, c->win);
1149         setclientstate(c, NormalState);
1150         arrange(c->mon);
1151 }
1152
1153 void
1154 mappingnotify(XEvent *e) {
1155         XMappingEvent *ev = &e->xmapping;
1156
1157         XRefreshKeyboardMapping(ev);
1158         if(ev->request == MappingKeyboard)
1159                 grabkeys();
1160 }
1161
1162 void
1163 maprequest(XEvent *e) {
1164         static XWindowAttributes wa;
1165         XMapRequestEvent *ev = &e->xmaprequest;
1166
1167         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1168                 return;
1169         if(wa.override_redirect)
1170                 return;
1171         if(!wintoclient(ev->window))
1172                 manage(ev->window, &wa);
1173 }
1174
1175 void
1176 monocle(Monitor *m) {
1177         unsigned int n = 0;
1178         Client *c;
1179
1180         for(c = m->clients; c; c = c->next)
1181                 if(ISVISIBLE(c))
1182                         n++;
1183         if(n > 0) /* override layout symbol */
1184                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1185         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1186                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1187 }
1188
1189 void
1190 movemouse(const Arg *arg) {
1191         int x, y, ocx, ocy, nx, ny;
1192         Client *c;
1193         Monitor *m;
1194         XEvent ev;
1195
1196         if(!(c = selmon->sel))
1197                 return;
1198         restack(selmon);
1199         ocx = c->x;
1200         ocy = c->y;
1201         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1202         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1203                 return;
1204         if(!getrootptr(&x, &y))
1205                 return;
1206         do {
1207                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1208                 switch (ev.type) {
1209                 case ConfigureRequest:
1210                 case Expose:
1211                 case MapRequest:
1212                         handler[ev.type](&ev);
1213                         break;
1214                 case MotionNotify:
1215                         nx = ocx + (ev.xmotion.x - x);
1216                         ny = ocy + (ev.xmotion.y - y);
1217                         if(snap && nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1218                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1219                                 if(abs(selmon->wx - nx) < snap)
1220                                         nx = selmon->wx;
1221                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1222                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1223                                 if(abs(selmon->wy - ny) < snap)
1224                                         ny = selmon->wy;
1225                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1226                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1227                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1228                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1229                                         togglefloating(NULL);
1230                         }
1231                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1232                                 resize(c, nx, ny, c->w, c->h, True);
1233                         break;
1234                 }
1235         } while(ev.type != ButtonRelease);
1236         XUngrabPointer(dpy, CurrentTime);
1237         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1238                 sendmon(c, m);
1239                 selmon = m;
1240                 focus(NULL);
1241         }
1242 }
1243
1244 Client *
1245 nexttiled(Client *c) {
1246         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1247         return c;
1248 }
1249
1250 Monitor *
1251 ptrtomon(int x, int y) {
1252         Monitor *m;
1253
1254         for(m = mons; m; m = m->next)
1255                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1256                         return m;
1257         return selmon;
1258 }
1259
1260 void
1261 propertynotify(XEvent *e) {
1262         Client *c;
1263         Window trans;
1264         XPropertyEvent *ev = &e->xproperty;
1265
1266         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1267                 updatestatus();
1268         else if(ev->state == PropertyDelete)
1269                 return; /* ignore */
1270         else if((c = wintoclient(ev->window))) {
1271                 switch (ev->atom) {
1272                 default: break;
1273                 case XA_WM_TRANSIENT_FOR:
1274                         XGetTransientForHint(dpy, c->win, &trans);
1275                         if(!c->isfloating && (c->isfloating = (wintoclient(trans) != NULL)))
1276                                 arrange(c->mon);
1277                         break;
1278                 case XA_WM_NORMAL_HINTS:
1279                         updatesizehints(c);
1280                         break;
1281                 case XA_WM_HINTS:
1282                         updatewmhints(c);
1283                         drawbars();
1284                         break;
1285                 }
1286                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1287                         updatetitle(c);
1288                         if(c == c->mon->sel)
1289                                 drawbar(c->mon);
1290                 }
1291         }
1292 }
1293
1294 void
1295 quit(const Arg *arg) {
1296         running = False;
1297 }
1298
1299 void
1300 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1301         XWindowChanges wc;
1302
1303         if(applysizehints(c, &x, &y, &w, &h, interact)) {
1304                 c->x = wc.x = x;
1305                 c->y = wc.y = y;
1306                 c->w = wc.width = w;
1307                 c->h = wc.height = h;
1308                 wc.border_width = c->bw;
1309                 XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1310                 configure(c);
1311                 XSync(dpy, False);
1312         }
1313 }
1314
1315 void
1316 resizemouse(const Arg *arg) {
1317         int ocx, ocy;
1318         int nw, nh;
1319         Client *c;
1320         Monitor *m;
1321         XEvent ev;
1322
1323         if(!(c = selmon->sel))
1324                 return;
1325         restack(selmon);
1326         ocx = c->x;
1327         ocy = c->y;
1328         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1329                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1330                 return;
1331         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1332         do {
1333                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1334                 switch(ev.type) {
1335                 case ConfigureRequest:
1336                 case Expose:
1337                 case MapRequest:
1338                         handler[ev.type](&ev);
1339                         break;
1340                 case MotionNotify:
1341                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1342                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1343                         if(snap && nw >= selmon->wx && nw <= selmon->wx + selmon->ww
1344                         && nh >= selmon->wy && nh <= selmon->wy + selmon->wh)
1345                         {
1346                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1347                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1348                                         togglefloating(NULL);
1349                         }
1350                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1351                                 resize(c, c->x, c->y, nw, nh, True);
1352                         break;
1353                 }
1354         } while(ev.type != ButtonRelease);
1355         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1356         XUngrabPointer(dpy, CurrentTime);
1357         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1358         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1359                 sendmon(c, m);
1360                 selmon = m;
1361                 focus(NULL);
1362         }
1363 }
1364
1365 void
1366 restack(Monitor *m) {
1367         Client *c;
1368         XEvent ev;
1369         XWindowChanges wc;
1370
1371         drawbar(m);
1372         if(!m->sel)
1373                 return;
1374         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1375                 XRaiseWindow(dpy, m->sel->win);
1376         if(m->lt[m->sellt]->arrange) {
1377                 wc.stack_mode = Below;
1378                 wc.sibling = m->barwin;
1379                 for(c = m->stack; c; c = c->snext)
1380                         if(!c->isfloating && ISVISIBLE(c)) {
1381                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1382                                 wc.sibling = c->win;
1383                         }
1384         }
1385         XSync(dpy, False);
1386         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1387 }
1388
1389 void
1390 run(void) {
1391         XEvent ev;
1392         /* main event loop */
1393         XSync(dpy, False);
1394         while(running && !XNextEvent(dpy, &ev)) {
1395                 if(handler[ev.type])
1396                         handler[ev.type](&ev); /* call handler */
1397         }
1398 }
1399
1400 void
1401 scan(void) {
1402         unsigned int i, num;
1403         Window d1, d2, *wins = NULL;
1404         XWindowAttributes wa;
1405
1406         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1407                 for(i = 0; i < num; i++) {
1408                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1409                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1410                                 continue;
1411                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1412                                 manage(wins[i], &wa);
1413                 }
1414                 for(i = 0; i < num; i++) { /* now the transients */
1415                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1416                                 continue;
1417                         if(XGetTransientForHint(dpy, wins[i], &d1)
1418                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1419                                 manage(wins[i], &wa);
1420                 }
1421                 if(wins)
1422                         XFree(wins);
1423         }
1424 }
1425
1426 void
1427 sendmon(Client *c, Monitor *m) {
1428         if(c->mon == m)
1429                 return;
1430         unfocus(c);
1431         detach(c);
1432         detachstack(c);
1433         c->mon = m;
1434         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1435         attach(c);
1436         attachstack(c);
1437         focus(NULL);
1438         arrange(NULL);
1439 }
1440
1441 void
1442 setclientstate(Client *c, long state) {
1443         long data[] = { state, None };
1444
1445         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1446                         PropModeReplace, (unsigned char *)data, 2);
1447 }
1448
1449 void
1450 setlayout(const Arg *arg) {
1451         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1452                 selmon->sellt ^= 1;
1453         if(arg && arg->v)
1454                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1455         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1456         if(selmon->sel)
1457                 arrange(selmon);
1458         else
1459                 drawbar(selmon);
1460 }
1461
1462 /* arg > 1.0 will set mfact absolutly */
1463 void
1464 setmfact(const Arg *arg) {
1465         float f;
1466
1467         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1468                 return;
1469         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1470         if(f < 0.1 || f > 0.9)
1471                 return;
1472         selmon->mfact = f;
1473         arrange(selmon);
1474 }
1475
1476 void
1477 setup(void) {
1478         XSetWindowAttributes wa;
1479
1480         /* clean up any zombies immediately */
1481         sigchld(0);
1482
1483         /* init screen */
1484         screen = DefaultScreen(dpy);
1485         root = RootWindow(dpy, screen);
1486         initfont(font);
1487         sw = DisplayWidth(dpy, screen);
1488         sh = DisplayHeight(dpy, screen);
1489         bh = dc.h = dc.font.height + 2;
1490         updategeom();
1491         /* init atoms */
1492         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1493         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1494         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1495         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1496         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1497         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1498         /* init cursors */
1499         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1500         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1501         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1502         /* init appearance */
1503         dc.norm[ColBorder] = getcolor(normbordercolor);
1504         dc.norm[ColBG] = getcolor(normbgcolor);
1505         dc.norm[ColFG] = getcolor(normfgcolor);
1506         dc.sel[ColBorder] = getcolor(selbordercolor);
1507         dc.sel[ColBG] = getcolor(selbgcolor);
1508         dc.sel[ColFG] = getcolor(selfgcolor);
1509         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1510         dc.gc = XCreateGC(dpy, root, 0, NULL);
1511         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1512         if(!dc.font.set)
1513                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1514         /* init bars */
1515         updatebars();
1516         updatestatus();
1517         /* EWMH support per view */
1518         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1519                         PropModeReplace, (unsigned char *) netatom, NetLast);
1520         /* select for events */
1521         wa.cursor = cursor[CurNormal];
1522         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1523                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1524                         |PropertyChangeMask;
1525         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1526         XSelectInput(dpy, root, wa.event_mask);
1527         grabkeys();
1528 }
1529
1530 void
1531 showhide(Client *c) {
1532         if(!c)
1533                 return;
1534         if(ISVISIBLE(c)) { /* show clients top down */
1535                 XMoveWindow(dpy, c->win, c->x, c->y);
1536                 if(!c->mon->lt[c->mon->sellt]->arrange || c->isfloating)
1537                         resize(c, c->x, c->y, c->w, c->h, False);
1538                 showhide(c->snext);
1539         }
1540         else { /* hide clients bottom up */
1541                 showhide(c->snext);
1542                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1543         }
1544 }
1545
1546
1547 void
1548 sigchld(int unused) {
1549         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1550                 die("Can't install SIGCHLD handler");
1551         while(0 < waitpid(-1, NULL, WNOHANG));
1552 }
1553
1554 void
1555 spawn(const Arg *arg) {
1556         if(fork() == 0) {
1557                 if(dpy)
1558                         close(ConnectionNumber(dpy));
1559                 setsid();
1560                 execvp(((char **)arg->v)[0], (char **)arg->v);
1561                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1562                 perror(" failed");
1563                 exit(0);
1564         }
1565 }
1566
1567 void
1568 tag(const Arg *arg) {
1569         if(selmon->sel && arg->ui & TAGMASK) {
1570                 selmon->sel->tags = arg->ui & TAGMASK;
1571                 arrange(selmon);
1572         }
1573 }
1574
1575 void
1576 tagmon(const Arg *arg) {
1577         if(!selmon->sel || !mons->next)
1578                 return;
1579         sendmon(selmon->sel, dirtomon(arg->i));
1580 }
1581
1582 int
1583 textnw(const char *text, unsigned int len) {
1584         XRectangle r;
1585
1586         if(dc.font.set) {
1587                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1588                 return r.width;
1589         }
1590         return XTextWidth(dc.font.xfont, text, len);
1591 }
1592
1593 void
1594 tile(Monitor *m) {
1595         int x, y, h, w, mw;
1596         unsigned int i, n;
1597         Client *c;
1598
1599         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1600         if(n == 0)
1601                 return;
1602         /* master */
1603         c = nexttiled(m->clients);
1604         mw = m->mfact * m->ww;
1605         resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * c->bw, False);
1606         if(--n == 0)
1607                 return;
1608         /* tile stack */
1609         x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
1610         y = m->wy;
1611         w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
1612         h = m->wh / n;
1613         if(h < bh)
1614                 h = m->wh;
1615         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1616                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1617                        ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
1618                 if(h != m->wh)
1619                         y = c->y + HEIGHT(c);
1620         }
1621 }
1622
1623 void
1624 togglebar(const Arg *arg) {
1625         selmon->showbar = !selmon->showbar;
1626         updatebarpos(selmon);
1627         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1628         arrange(selmon);
1629 }
1630
1631 void
1632 togglefloating(const Arg *arg) {
1633         if(!selmon->sel)
1634                 return;
1635         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1636         if(selmon->sel->isfloating)
1637                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1638                        selmon->sel->w, selmon->sel->h, False);
1639         arrange(selmon);
1640 }
1641
1642 void
1643 toggletag(const Arg *arg) {
1644         unsigned int newtags;
1645
1646         if(!selmon->sel)
1647                 return;
1648         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1649         if(newtags) {
1650                 selmon->sel->tags = newtags;
1651                 arrange(selmon);
1652         }
1653 }
1654
1655 void
1656 toggleview(const Arg *arg) {
1657         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1658
1659         if(newtagset) {
1660                 selmon->tagset[selmon->seltags] = newtagset;
1661                 arrange(selmon);
1662         }
1663 }
1664
1665 void
1666 unfocus(Client *c) {
1667         if(!c)
1668                 return;
1669         grabbuttons(c, False);
1670         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1671         XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1672 }
1673
1674 void
1675 unmanage(Client *c, Bool destroyed) {
1676         Monitor *m = c->mon;
1677         XWindowChanges wc;
1678
1679         /* The server grab construct avoids race conditions. */
1680         detach(c);
1681         detachstack(c);
1682         if(!destroyed) {
1683                 wc.border_width = c->oldbw;
1684                 XGrabServer(dpy);
1685                 XSetErrorHandler(xerrordummy);
1686                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1687                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1688                 setclientstate(c, WithdrawnState);
1689                 XSync(dpy, False);
1690                 XSetErrorHandler(xerror);
1691                 XUngrabServer(dpy);
1692         }
1693         free(c);
1694         focus(NULL);
1695         arrange(m);
1696 }
1697
1698 void
1699 unmapnotify(XEvent *e) {
1700         Client *c;
1701         XUnmapEvent *ev = &e->xunmap;
1702
1703         if((c = wintoclient(ev->window)))
1704                 unmanage(c, False);
1705 }
1706
1707 void
1708 updatebars(void) {
1709         Monitor *m;
1710         XSetWindowAttributes wa;
1711
1712         wa.override_redirect = True;
1713         wa.background_pixmap = ParentRelative;
1714         wa.event_mask = ButtonPressMask|ExposureMask;
1715         for(m = mons; m; m = m->next) {
1716                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1717                                           CopyFromParent, DefaultVisual(dpy, screen),
1718                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1719                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1720                 XMapRaised(dpy, m->barwin);
1721         }
1722 }
1723
1724 void
1725 updatebarpos(Monitor *m) {
1726         m->wy = m->my;
1727         m->wh = m->mh;
1728         if(m->showbar) {
1729                 m->wh -= bh;
1730                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1731                 m->wy = m->topbar ? m->wy + bh : m->wy;
1732         }
1733         else
1734                 m->by = -bh;
1735 }
1736
1737 Bool
1738 updategeom(void) {
1739         Bool dirty = False;
1740
1741 #ifdef XINERAMA
1742         if(XineramaIsActive(dpy)) {
1743                 int i, j, n, nn;
1744                 Client *c;
1745                 Monitor *m;
1746                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1747                 XineramaScreenInfo *unique = NULL;
1748
1749                 info = XineramaQueryScreens(dpy, &nn);
1750                 for(n = 0, m = mons; m; m = m->next, n++);
1751                 /* only consider unique geometries as separate screens */
1752                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1753                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1754                 for(i = 0, j = 0; i < nn; i++)
1755                         if(isuniquegeom(unique, j, &info[i]))
1756                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1757                 XFree(info);
1758                 nn = j;
1759                 if(n <= nn) {
1760                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1761                                 for(m = mons; m && m->next; m = m->next);
1762                                 if(m)
1763                                         m->next = createmon();
1764                                 else
1765                                         mons = createmon();
1766                         }
1767                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1768                                 if(i >= n
1769                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1770                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1771                                 {
1772                                         dirty = True;
1773                                         m->num = i;
1774                                         m->mx = m->wx = unique[i].x_org;
1775                                         m->my = m->wy = unique[i].y_org;
1776                                         m->mw = m->ww = unique[i].width;
1777                                         m->mh = m->wh = unique[i].height;
1778                                         updatebarpos(m);
1779                                 }
1780                 }
1781                 else { /* less monitors available nn < n */
1782                         for(i = nn; i < n; i++) {
1783                                 for(m = mons; m && m->next; m = m->next);
1784                                 while(m->clients) {
1785                                         dirty = True;
1786                                         c = m->clients;
1787                                         m->clients = c->next;
1788                                         detachstack(c);
1789                                         c->mon = mons;
1790                                         attach(c);
1791                                         attachstack(c);
1792                                 }
1793                                 if(m == selmon)
1794                                         selmon = mons;
1795                                 cleanupmon(m);
1796                         }
1797                 }
1798                 free(unique);
1799         }
1800         else
1801 #endif /* XINERAMA */
1802         /* default monitor setup */
1803         {
1804                 if(!mons)
1805                         mons = createmon();
1806                 if(mons->mw != sw || mons->mh != sh) {
1807                         dirty = True;
1808                         mons->mw = mons->ww = sw;
1809                         mons->mh = mons->wh = sh;
1810                         updatebarpos(mons);
1811                 }
1812         }
1813         if(dirty) {
1814                 selmon = mons;
1815                 selmon = wintomon(root);
1816         }
1817         return dirty;
1818 }
1819
1820 void
1821 updatenumlockmask(void) {
1822         unsigned int i, j;
1823         XModifierKeymap *modmap;
1824
1825         numlockmask = 0;
1826         modmap = XGetModifierMapping(dpy);
1827         for(i = 0; i < 8; i++)
1828                 for(j = 0; j < modmap->max_keypermod; j++)
1829                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1830                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1831                                 numlockmask = (1 << i);
1832         XFreeModifiermap(modmap);
1833 }
1834
1835 void
1836 updatesizehints(Client *c) {
1837         long msize;
1838         XSizeHints size;
1839
1840         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1841                 /* size is uninitialized, ensure that size.flags aren't used */
1842                 size.flags = PSize;
1843         if(size.flags & PBaseSize) {
1844                 c->basew = size.base_width;
1845                 c->baseh = size.base_height;
1846         }
1847         else if(size.flags & PMinSize) {
1848                 c->basew = size.min_width;
1849                 c->baseh = size.min_height;
1850         }
1851         else
1852                 c->basew = c->baseh = 0;
1853         if(size.flags & PResizeInc) {
1854                 c->incw = size.width_inc;
1855                 c->inch = size.height_inc;
1856         }
1857         else
1858                 c->incw = c->inch = 0;
1859         if(size.flags & PMaxSize) {
1860                 c->maxw = size.max_width;
1861                 c->maxh = size.max_height;
1862         }
1863         else
1864                 c->maxw = c->maxh = 0;
1865         if(size.flags & PMinSize) {
1866                 c->minw = size.min_width;
1867                 c->minh = size.min_height;
1868         }
1869         else if(size.flags & PBaseSize) {
1870                 c->minw = size.base_width;
1871                 c->minh = size.base_height;
1872         }
1873         else
1874                 c->minw = c->minh = 0;
1875         if(size.flags & PAspect) {
1876                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1877                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1878         }
1879         else
1880                 c->maxa = c->mina = 0.0;
1881         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1882                      && c->maxw == c->minw && c->maxh == c->minh);
1883 }
1884
1885 void
1886 updatetitle(Client *c) {
1887         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1888                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1889         if(c->name[0] == '\0') /* hack to mark broken clients */
1890                 strcpy(c->name, broken);
1891 }
1892
1893 void
1894 updatestatus(void) {
1895         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1896                 strcpy(stext, "dwm-"VERSION);
1897         drawbar(selmon);
1898 }
1899
1900 void
1901 updatewmhints(Client *c) {
1902         XWMHints *wmh;
1903
1904         if((wmh = XGetWMHints(dpy, c->win))) {
1905                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
1906                         wmh->flags &= ~XUrgencyHint;
1907                         XSetWMHints(dpy, c->win, wmh);
1908                 }
1909                 else
1910                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1911                 XFree(wmh);
1912         }
1913 }
1914
1915 void
1916 view(const Arg *arg) {
1917         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
1918                 return;
1919         selmon->seltags ^= 1; /* toggle sel tagset */
1920         if(arg->ui & TAGMASK)
1921                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
1922         arrange(selmon);
1923 }
1924
1925 Client *
1926 wintoclient(Window w) {
1927         Client *c;
1928         Monitor *m;
1929
1930         for(m = mons; m; m = m->next)
1931                 for(c = m->clients; c; c = c->next)
1932                         if(c->win == w)
1933                                 return c;
1934         return NULL;
1935 }
1936
1937 Monitor *
1938 wintomon(Window w) {
1939         int x, y;
1940         Client *c;
1941         Monitor *m;
1942
1943         if(w == root && getrootptr(&x, &y))
1944                 return ptrtomon(x, y);
1945         for(m = mons; m; m = m->next)
1946                 if(w == m->barwin)
1947                         return m;
1948         if((c = wintoclient(w)))
1949                 return c->mon;
1950         return selmon;
1951 }
1952
1953 /* There's no way to check accesses to destroyed windows, thus those cases are
1954  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1955  * default error handler, which may call exit.  */
1956 int
1957 xerror(Display *dpy, XErrorEvent *ee) {
1958         if(ee->error_code == BadWindow
1959         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1960         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1961         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1962         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1963         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1964         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1965         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1966         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1967                 return 0;
1968         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1969                         ee->request_code, ee->error_code);
1970         return xerrorxlib(dpy, ee); /* may call exit */
1971 }
1972
1973 int
1974 xerrordummy(Display *dpy, XErrorEvent *ee) {
1975         return 0;
1976 }
1977
1978 /* Startup Error handler to check if another window manager
1979  * is already running. */
1980 int
1981 xerrorstart(Display *dpy, XErrorEvent *ee) {
1982         otherwm = True;
1983         return -1;
1984 }
1985
1986 void
1987 zoom(const Arg *arg) {
1988         Client *c = selmon->sel;
1989
1990         if(!selmon->lt[selmon->sellt]->arrange
1991         || selmon->lt[selmon->sellt]->arrange == monocle
1992         || (selmon->sel && selmon->sel->isfloating))
1993                 return;
1994         if(c == nexttiled(selmon->clients))
1995                 if(!c || !(c = nexttiled(c->next)))
1996                         return;
1997         detach(c);
1998         attach(c);
1999         focus(c);
2000         arrange(c->mon);
2001 }
2002
2003 int
2004 main(int argc, char *argv[]) {
2005         if(argc == 2 && !strcmp("-v", argv[1]))
2006                 die("dwm-"VERSION", © 2006-2010 dwm engineers, see LICENSE for details\n");
2007         else if(argc != 1)
2008                 die("usage: dwm [-v]\n");
2009         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2010                 fputs("warning: no locale support\n", stderr);
2011         if(!(dpy = XOpenDisplay(NULL)))
2012                 die("dwm: cannot open display\n");
2013         checkotherwm();
2014         setup();
2015         scan();
2016         run();
2017         cleanup();
2018         XCloseDisplay(dpy);
2019         return 0;
2020 }