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