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 <signal.h>
  26 #include <stdarg.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 #include <X11/Xft/Xft.h>
  43
  44 #include "drw.h"
  45 #include "util.h"
  46
  47 /* macros */
  48 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  49 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  50 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  51                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  52 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  53 #define LENGTH(X)               (sizeof X / sizeof X[0])
  54 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  55 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  56 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  57 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  58 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  59
  60 /* enums */
  61 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  62 enum { SchemeNorm, SchemeSel }; /* color schemes */
  63 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  64        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  65        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  66 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  67 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  68        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  69
  70 typedef union {
  71         int i;
  72         unsigned int ui;
  73         float f;
  74         const void *v;
  75 } Arg;
  76
  77 typedef struct {
  78         unsigned int click;
  79         unsigned int mask;
  80         unsigned int button;
  81         void (*func)(const Arg *arg);
  82         const Arg arg;
  83 } Button;
  84
  85 typedef struct Monitor Monitor;
  86 typedef struct Client Client;
  87 struct Client {
  88         char name[256];
  89         float mina, maxa;
  90         int x, y, w, h;
  91         int oldx, oldy, oldw, oldh;
  92         int basew, baseh, incw, inch, maxw, maxh, minw, minh, hintsvalid;
  93         int bw, oldbw;
  94         unsigned int tags;
  95         int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  96         Client *next;
  97         Client *snext;
  98         Monitor *mon;
  99         Window win;
 100 };
 101
 102 typedef struct {
 103         unsigned int mod;
 104         KeySym keysym;
 105         void (*func)(const Arg *);
 106         const Arg arg;
 107 } Key;
 108
 109 typedef struct {
 110         const char *symbol;
 111         void (*arrange)(Monitor *);
 112 } Layout;
 113
 114 struct Monitor {
 115         char ltsymbol[16];
 116         float mfact;
 117         int nmaster;
 118         int num;
 119         int by;               /* bar geometry */
 120         int mx, my, mw, mh;   /* screen size */
 121         int wx, wy, ww, wh;   /* window area  */
 122         unsigned int seltags;
 123         unsigned int sellt;
 124         unsigned int tagset[2];
 125         int showbar;
 126         int topbar;
 127         Client *clients;
 128         Client *sel;
 129         Client *stack;
 130         Monitor *next;
 131         Window barwin;
 132         const Layout *lt[2];
 133 };
 134
 135 typedef struct {
 136         const char *class;
 137         const char *instance;
 138         const char *title;
 139         unsigned int tags;
 140         int isfloating;
 141         int monitor;
 142 } Rule;
 143
 144 /* function declarations */
 145 static void applyrules(Client *c);
 146 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 147 static void arrange(Monitor *m);
 148 static void arrangemon(Monitor *m);
 149 static void attach(Client *c);
 150 static void attachstack(Client *c);
 151 static void buttonpress(XEvent *e);
 152 static void checkotherwm(void);
 153 static void cleanup(void);
 154 static void cleanupmon(Monitor *mon);
 155 static void clientmessage(XEvent *e);
 156 static void configure(Client *c);
 157 static void configurenotify(XEvent *e);
 158 static void configurerequest(XEvent *e);
 159 static Monitor *createmon(void);
 160 static void destroynotify(XEvent *e);
 161 static void detach(Client *c);
 162 static void detachstack(Client *c);
 163 static Monitor *dirtomon(int dir);
 164 static void drawbar(Monitor *m);
 165 static void drawbars(void);
 166 static void enternotify(XEvent *e);
 167 static void expose(XEvent *e);
 168 static void focus(Client *c);
 169 static void focusin(XEvent *e);
 170 static void focusmon(const Arg *arg);
 171 static void focusstack(const Arg *arg);
 172 static Atom getatomprop(Client *c, Atom prop);
 173 static int getrootptr(int *x, int *y);
 174 static long getstate(Window w);
 175 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 176 static void grabbuttons(Client *c, int focused);
 177 static void grabkeys(void);
 178 static void incnmaster(const Arg *arg);
 179 static void keypress(XEvent *e);
 180 static void killclient(const Arg *arg);
 181 static void manage(Window w, XWindowAttributes *wa);
 182 static void mappingnotify(XEvent *e);
 183 static void maprequest(XEvent *e);
 184 static void monocle(Monitor *m);
 185 static void motionnotify(XEvent *e);
 186 static void movemouse(const Arg *arg);
 187 static Client *nexttiled(Client *c);
 188 static void pop(Client *c);
 189 static void propertynotify(XEvent *e);
 190 static void quit(const Arg *arg);
 191 static Monitor *recttomon(int x, int y, int w, int h);
 192 static void resize(Client *c, int x, int y, int w, int h, int interact);
 193 static void resizeclient(Client *c, int x, int y, int w, int h);
 194 static void resizemouse(const Arg *arg);
 195 static void restack(Monitor *m);
 196 static void run(void);
 197 static void scan(void);
 198 static int sendevent(Client *c, Atom proto);
 199 static void sendmon(Client *c, Monitor *m);
 200 static void setclientstate(Client *c, long state);
 201 static void setfocus(Client *c);
 202 static void setfullscreen(Client *c, int fullscreen);
 203 static void setlayout(const Arg *arg);
 204 static void setmfact(const Arg *arg);
 205 static void setup(void);
 206 static void seturgent(Client *c, int urg);
 207 static void showhide(Client *c);
 208 static void spawn(const Arg *arg);
 209 static void tag(const Arg *arg);
 210 static void tagmon(const Arg *arg);
 211 static void tile(Monitor *m);
 212 static void togglebar(const Arg *arg);
 213 static void togglefloating(const Arg *arg);
 214 static void toggletag(const Arg *arg);
 215 static void toggleview(const Arg *arg);
 216 static void unfocus(Client *c, int setfocus);
 217 static void unmanage(Client *c, int destroyed);
 218 static void unmapnotify(XEvent *e);
 219 static void updatebarpos(Monitor *m);
 220 static void updatebars(void);
 221 static void updateclientlist(void);
 222 static int updategeom(void);
 223 static void updatenumlockmask(void);
 224 static void updatesizehints(Client *c);
 225 static void updatestatus(void);
 226 static void updatetitle(Client *c);
 227 static void updatewindowtype(Client *c);
 228 static void updatewmhints(Client *c);
 229 static void view(const Arg *arg);
 230 static Client *wintoclient(Window w);
 231 static Monitor *wintomon(Window w);
 232 static int xerror(Display *dpy, XErrorEvent *ee);
 233 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 234 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 235 static void zoom(const Arg *arg);
 236
 237 /* variables */
 238 static const char broken[] = "broken";
 239 static char stext[256];
 240 static int screen;
 241 static int sw, sh;           /* X display screen geometry width, height */
 242 static int bh;               /* bar height */
 243 static int lrpad;            /* sum of left and right padding for text */
 244 static int (*xerrorxlib)(Display *, XErrorEvent *);
 245 static unsigned int numlockmask = 0;
 246 static void (*handler[LASTEvent]) (XEvent *) = {
 247         [ButtonPress] = buttonpress,
 248         [ClientMessage] = clientmessage,
 249         [ConfigureRequest] = configurerequest,
 250         [ConfigureNotify] = configurenotify,
 251         [DestroyNotify] = destroynotify,
 252         [EnterNotify] = enternotify,
 253         [Expose] = expose,
 254         [FocusIn] = focusin,
 255         [KeyPress] = keypress,
 256         [MappingNotify] = mappingnotify,
 257         [MapRequest] = maprequest,
 258         [MotionNotify] = motionnotify,
 259         [PropertyNotify] = propertynotify,
 260         [UnmapNotify] = unmapnotify
 261 };
 262 static Atom wmatom[WMLast], netatom[NetLast];
 263 static int running = 1;
 264 static Cur *cursor[CurLast];
 265 static Clr **scheme;
 266 static Display *dpy;
 267 static Drw *drw;
 268 static Monitor *mons, *selmon;
 269 static Window root, wmcheckwin;
 270
 271 /* configuration, allows nested code to access above variables */
 272 #include "config.h"
 273
 274 /* compile-time check if all tags fit into an unsigned int bit array. */
 275 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 276
 277 /* function implementations */
 278 void
 279 applyrules(Client *c)
 280 {
 281         const char *class, *instance;
 282         unsigned int i;
 283         const Rule *r;
 284         Monitor *m;
 285         XClassHint ch = { NULL, NULL };
 286
 287         /* rule matching */
 288         c->isfloating = 0;
 289         c->tags = 0;
 290         XGetClassHint(dpy, c->win, &ch);
 291         class    = ch.res_class ? ch.res_class : broken;
 292         instance = ch.res_name  ? ch.res_name  : broken;
 293
 294         for (i = 0; i < LENGTH(rules); i++) {
 295                 r = &rules[i];
 296                 if ((!r->title || strstr(c->name, r->title))
 297                 && (!r->class || strstr(class, r->class))
 298                 && (!r->instance || strstr(instance, r->instance)))
 299                 {
 300                         c->isfloating = r->isfloating;
 301                         c->tags |= r->tags;
 302                         for (m = mons; m && m->num != r->monitor; m = m->next);
 303                         if (m)
 304                                 c->mon = m;
 305                 }
 306         }
 307         if (ch.res_class)
 308                 XFree(ch.res_class);
 309         if (ch.res_name)
 310                 XFree(ch.res_name);
 311         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 312 }
 313
 314 int
 315 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 316 {
 317         int baseismin;
 318         Monitor *m = c->mon;
 319
 320         /* set minimum possible */
 321         *w = MAX(1, *w);
 322         *h = MAX(1, *h);
 323         if (interact) {
 324                 if (*x > sw)
 325                         *x = sw - WIDTH(c);
 326                 if (*y > sh)
 327                         *y = sh - HEIGHT(c);
 328                 if (*x + *w + 2 * c->bw < 0)
 329                         *x = 0;
 330                 if (*y + *h + 2 * c->bw < 0)
 331                         *y = 0;
 332         } else {
 333                 if (*x >= m->wx + m->ww)
 334                         *x = m->wx + m->ww - WIDTH(c);
 335                 if (*y >= m->wy + m->wh)
 336                         *y = m->wy + m->wh - HEIGHT(c);
 337                 if (*x + *w + 2 * c->bw <= m->wx)
 338                         *x = m->wx;
 339                 if (*y + *h + 2 * c->bw <= m->wy)
 340                         *y = m->wy;
 341         }
 342         if (*h < bh)
 343                 *h = bh;
 344         if (*w < bh)
 345                 *w = bh;
 346         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 347                 if (!c->hintsvalid)
 348                         updatesizehints(c);
 349                 /* see last two sentences in ICCCM 4.1.2.3 */
 350                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 351                 if (!baseismin) { /* temporarily remove base dimensions */
 352                         *w -= c->basew;
 353                         *h -= c->baseh;
 354                 }
 355                 /* adjust for aspect limits */
 356                 if (c->mina > 0 && c->maxa > 0) {
 357                         if (c->maxa < (float)*w / *h)
 358                                 *w = *h * c->maxa + 0.5;
 359                         else if (c->mina < (float)*h / *w)
 360                                 *h = *w * c->mina + 0.5;
 361                 }
 362                 if (baseismin) { /* increment calculation requires this */
 363                         *w -= c->basew;
 364                         *h -= c->baseh;
 365                 }
 366                 /* adjust for increment value */
 367                 if (c->incw)
 368                         *w -= *w % c->incw;
 369                 if (c->inch)
 370                         *h -= *h % c->inch;
 371                 /* restore base dimensions */
 372                 *w = MAX(*w + c->basew, c->minw);
 373                 *h = MAX(*h + c->baseh, 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 {
 385         if (m)
 386                 showhide(m->stack);
 387         else for (m = mons; m; m = m->next)
 388                 showhide(m->stack);
 389         if (m) {
 390                 arrangemon(m);
 391                 restack(m);
 392         } else for (m = mons; m; m = m->next)
 393                 arrangemon(m);
 394 }
 395
 396 void
 397 arrangemon(Monitor *m)
 398 {
 399         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 400         if (m->lt[m->sellt]->arrange)
 401                 m->lt[m->sellt]->arrange(m);
 402 }
 403
 404 void
 405 attach(Client *c)
 406 {
 407         c->next = c->mon->clients;
 408         c->mon->clients = c;
 409 }
 410
 411 void
 412 attachstack(Client *c)
 413 {
 414         c->snext = c->mon->stack;
 415         c->mon->stack = c;
 416 }
 417
 418 void
 419 buttonpress(XEvent *e)
 420 {
 421         unsigned int i, x, click;
 422         Arg arg = {0};
 423         Client *c;
 424         Monitor *m;
 425         XButtonPressedEvent *ev = &e->xbutton;
 426
 427         click = ClkRootWin;
 428         /* focus monitor if necessary */
 429         if ((m = wintomon(ev->window)) && m != selmon) {
 430                 unfocus(selmon->sel, 1);
 431                 selmon = m;
 432                 focus(NULL);
 433         }
 434         if (ev->window == selmon->barwin) {
 435                 i = x = 0;
 436                 do
 437                         x += TEXTW(tags[i]);
 438                 while (ev->x >= x && ++i < LENGTH(tags));
 439                 if (i < LENGTH(tags)) {
 440                         click = ClkTagBar;
 441                         arg.ui = 1 << i;
 442                 } else if (ev->x < x + TEXTW(selmon->ltsymbol))
 443                         click = ClkLtSymbol;
 444                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 445                         click = ClkStatusText;
 446                 else
 447                         click = ClkWinTitle;
 448         } else if ((c = wintoclient(ev->window))) {
 449                 focus(c);
 450                 restack(selmon);
 451                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 452                 click = ClkClientWin;
 453         }
 454         for (i = 0; i < LENGTH(buttons); i++)
 455                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 456                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 457                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 458 }
 459
 460 void
 461 checkotherwm(void)
 462 {
 463         xerrorxlib = XSetErrorHandler(xerrorstart);
 464         /* this causes an error if some other window manager is running */
 465         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 466         XSync(dpy, False);
 467         XSetErrorHandler(xerror);
 468         XSync(dpy, False);
 469 }
 470
 471 void
 472 cleanup(void)
 473 {
 474         Arg a = {.ui = ~0};
 475         Layout foo = { "", NULL };
 476         Monitor *m;
 477         size_t i;
 478
 479         view(&a);
 480         selmon->lt[selmon->sellt] = &foo;
 481         for (m = mons; m; m = m->next)
 482                 while (m->stack)
 483                         unmanage(m->stack, 0);
 484         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 485         while (mons)
 486                 cleanupmon(mons);
 487         for (i = 0; i < CurLast; i++)
 488                 drw_cur_free(drw, cursor[i]);
 489         for (i = 0; i < LENGTH(colors); i++)
 490                 free(scheme[i]);
 491         free(scheme);
 492         XDestroyWindow(dpy, wmcheckwin);
 493         drw_free(drw);
 494         XSync(dpy, False);
 495         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 496         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 497 }
 498
 499 void
 500 cleanupmon(Monitor *mon)
 501 {
 502         Monitor *m;
 503
 504         if (mon == mons)
 505                 mons = mons->next;
 506         else {
 507                 for (m = mons; m && m->next != mon; m = m->next);
 508                 m->next = mon->next;
 509         }
 510         XUnmapWindow(dpy, mon->barwin);
 511         XDestroyWindow(dpy, mon->barwin);
 512         free(mon);
 513 }
 514
 515 void
 516 clientmessage(XEvent *e)
 517 {
 518         XClientMessageEvent *cme = &e->xclient;
 519         Client *c = wintoclient(cme->window);
 520
 521         if (!c)
 522                 return;
 523         if (cme->message_type == netatom[NetWMState]) {
 524                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 525                 || cme->data.l[2] == netatom[NetWMFullscreen])
 526                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 527                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 528         } else if (cme->message_type == netatom[NetActiveWindow]) {
 529                 if (c != selmon->sel && !c->isurgent)
 530                         seturgent(c, 1);
 531         }
 532 }
 533
 534 void
 535 configure(Client *c)
 536 {
 537         XConfigureEvent ce;
 538
 539         ce.type = ConfigureNotify;
 540         ce.display = dpy;
 541         ce.event = c->win;
 542         ce.window = c->win;
 543         ce.x = c->x;
 544         ce.y = c->y;
 545         ce.width = c->w;
 546         ce.height = c->h;
 547         ce.border_width = c->bw;
 548         ce.above = None;
 549         ce.override_redirect = False;
 550         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 551 }
 552
 553 void
 554 configurenotify(XEvent *e)
 555 {
 556         Monitor *m;
 557         Client *c;
 558         XConfigureEvent *ev = &e->xconfigure;
 559         int dirty;
 560
 561         /* TODO: updategeom handling sucks, needs to be simplified */
 562         if (ev->window == root) {
 563                 dirty = (sw != ev->width || sh != ev->height);
 564                 sw = ev->width;
 565                 sh = ev->height;
 566                 if (updategeom() || dirty) {
 567                         drw_resize(drw, sw, bh);
 568                         updatebars();
 569                         for (m = mons; m; m = m->next) {
 570                                 for (c = m->clients; c; c = c->next)
 571                                         if (c->isfullscreen)
 572                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 573                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 574                         }
 575                         focus(NULL);
 576                         arrange(NULL);
 577                 }
 578         }
 579 }
 580
 581 void
 582 configurerequest(XEvent *e)
 583 {
 584         Client *c;
 585         Monitor *m;
 586         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 587         XWindowChanges wc;
 588
 589         if ((c = wintoclient(ev->window))) {
 590                 if (ev->value_mask & CWBorderWidth)
 591                         c->bw = ev->border_width;
 592                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 593                         m = c->mon;
 594                         if (ev->value_mask & CWX) {
 595                                 c->oldx = c->x;
 596                                 c->x = m->mx + ev->x;
 597                         }
 598                         if (ev->value_mask & CWY) {
 599                                 c->oldy = c->y;
 600                                 c->y = m->my + ev->y;
 601                         }
 602                         if (ev->value_mask & CWWidth) {
 603                                 c->oldw = c->w;
 604                                 c->w = ev->width;
 605                         }
 606                         if (ev->value_mask & CWHeight) {
 607                                 c->oldh = c->h;
 608                                 c->h = ev->height;
 609                         }
 610                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 611                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 612                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 613                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 614                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 615                                 configure(c);
 616                         if (ISVISIBLE(c))
 617                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 618                 } else
 619                         configure(c);
 620         } else {
 621                 wc.x = ev->x;
 622                 wc.y = ev->y;
 623                 wc.width = ev->width;
 624                 wc.height = ev->height;
 625                 wc.border_width = ev->border_width;
 626                 wc.sibling = ev->above;
 627                 wc.stack_mode = ev->detail;
 628                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 629         }
 630         XSync(dpy, False);
 631 }
 632
 633 Monitor *
 634 createmon(void)
 635 {
 636         Monitor *m;
 637
 638         m = ecalloc(1, sizeof(Monitor));
 639         m->tagset[0] = m->tagset[1] = 1;
 640         m->mfact = mfact;
 641         m->nmaster = nmaster;
 642         m->showbar = showbar;
 643         m->topbar = topbar;
 644         m->lt[0] = &layouts[0];
 645         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 646         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 647         return m;
 648 }
 649
 650 void
 651 destroynotify(XEvent *e)
 652 {
 653         Client *c;
 654         XDestroyWindowEvent *ev = &e->xdestroywindow;
 655
 656         if ((c = wintoclient(ev->window)))
 657                 unmanage(c, 1);
 658 }
 659
 660 void
 661 detach(Client *c)
 662 {
 663         Client **tc;
 664
 665         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 666         *tc = c->next;
 667 }
 668
 669 void
 670 detachstack(Client *c)
 671 {
 672         Client **tc, *t;
 673
 674         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 675         *tc = c->snext;
 676
 677         if (c == c->mon->sel) {
 678                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 679                 c->mon->sel = t;
 680         }
 681 }
 682
 683 Monitor *
 684 dirtomon(int dir)
 685 {
 686         Monitor *m = NULL;
 687
 688         if (dir > 0) {
 689                 if (!(m = selmon->next))
 690                         m = mons;
 691         } else if (selmon == mons)
 692                 for (m = mons; m->next; m = m->next);
 693         else
 694                 for (m = mons; m->next != selmon; m = m->next);
 695         return m;
 696 }
 697
 698 void
 699 drawbar(Monitor *m)
 700 {
 701         int x, w, tw = 0;
 702         int boxs = drw->fonts->h / 9;
 703         int boxw = drw->fonts->h / 6 + 2;
 704         unsigned int i, occ = 0, urg = 0;
 705         Client *c;
 706
 707         if (!m->showbar)
 708                 return;
 709
 710         /* draw status first so it can be overdrawn by tags later */
 711         if (m == selmon) { /* status is only drawn on selected monitor */
 712                 drw_setscheme(drw, scheme[SchemeNorm]);
 713                 tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 714                 drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
 715         }
 716
 717         for (c = m->clients; c; c = c->next) {
 718                 occ |= c->tags;
 719                 if (c->isurgent)
 720                         urg |= c->tags;
 721         }
 722         x = 0;
 723         for (i = 0; i < LENGTH(tags); i++) {
 724                 w = TEXTW(tags[i]);
 725                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 726                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 727                 if (occ & 1 << i)
 728                         drw_rect(drw, x + boxs, boxs, boxw, boxw,
 729                                 m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 730                                 urg & 1 << i);
 731                 x += w;
 732         }
 733         w = TEXTW(m->ltsymbol);
 734         drw_setscheme(drw, scheme[SchemeNorm]);
 735         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 736
 737         if ((w = m->ww - tw - x) > bh) {
 738                 if (m->sel) {
 739                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 740                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 741                         if (m->sel->isfloating)
 742                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 743                 } else {
 744                         drw_setscheme(drw, scheme[SchemeNorm]);
 745                         drw_rect(drw, x, 0, w, bh, 1, 1);
 746                 }
 747         }
 748         drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 749 }
 750
 751 void
 752 drawbars(void)
 753 {
 754         Monitor *m;
 755
 756         for (m = mons; m; m = m->next)
 757                 drawbar(m);
 758 }
 759
 760 void
 761 enternotify(XEvent *e)
 762 {
 763         Client *c;
 764         Monitor *m;
 765         XCrossingEvent *ev = &e->xcrossing;
 766
 767         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 768                 return;
 769         c = wintoclient(ev->window);
 770         m = c ? c->mon : wintomon(ev->window);
 771         if (m != selmon) {
 772                 unfocus(selmon->sel, 1);
 773                 selmon = m;
 774         } else if (!c || c == selmon->sel)
 775                 return;
 776         focus(c);
 777 }
 778
 779 void
 780 expose(XEvent *e)
 781 {
 782         Monitor *m;
 783         XExposeEvent *ev = &e->xexpose;
 784
 785         if (ev->count == 0 && (m = wintomon(ev->window)))
 786                 drawbar(m);
 787 }
 788
 789 void
 790 focus(Client *c)
 791 {
 792         if (!c || !ISVISIBLE(c))
 793                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 794         if (selmon->sel && selmon->sel != c)
 795                 unfocus(selmon->sel, 0);
 796         if (c) {
 797                 if (c->mon != selmon)
 798                         selmon = c->mon;
 799                 if (c->isurgent)
 800                         seturgent(c, 0);
 801                 detachstack(c);
 802                 attachstack(c);
 803                 grabbuttons(c, 1);
 804                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 805                 setfocus(c);
 806         } else {
 807                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 808                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 809         }
 810         selmon->sel = c;
 811         drawbars();
 812 }
 813
 814 /* there are some broken focus acquiring clients needing extra handling */
 815 void
 816 focusin(XEvent *e)
 817 {
 818         XFocusChangeEvent *ev = &e->xfocus;
 819
 820         if (selmon->sel && ev->window != selmon->sel->win)
 821                 setfocus(selmon->sel);
 822 }
 823
 824 void
 825 focusmon(const Arg *arg)
 826 {
 827         Monitor *m;
 828
 829         if (!mons->next)
 830                 return;
 831         if ((m = dirtomon(arg->i)) == selmon)
 832                 return;
 833         unfocus(selmon->sel, 0);
 834         selmon = m;
 835         focus(NULL);
 836 }
 837
 838 void
 839 focusstack(const Arg *arg)
 840 {
 841         Client *c = NULL, *i;
 842
 843         if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen))
 844                 return;
 845         if (arg->i > 0) {
 846                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 847                 if (!c)
 848                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 849         } else {
 850                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 851                         if (ISVISIBLE(i))
 852                                 c = i;
 853                 if (!c)
 854                         for (; i; i = i->next)
 855                                 if (ISVISIBLE(i))
 856                                         c = i;
 857         }
 858         if (c) {
 859                 focus(c);
 860                 restack(selmon);
 861         }
 862 }
 863
 864 Atom
 865 getatomprop(Client *c, Atom prop)
 866 {
 867         int di;
 868         unsigned long dl;
 869         unsigned char *p = NULL;
 870         Atom da, atom = None;
 871
 872         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 873                 &da, &di, &dl, &dl, &p) == Success && p) {
 874                 atom = *(Atom *)p;
 875                 XFree(p);
 876         }
 877         return atom;
 878 }
 879
 880 int
 881 getrootptr(int *x, int *y)
 882 {
 883         int di;
 884         unsigned int dui;
 885         Window dummy;
 886
 887         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 888 }
 889
 890 long
 891 getstate(Window w)
 892 {
 893         int format;
 894         long result = -1;
 895         unsigned char *p = NULL;
 896         unsigned long n, extra;
 897         Atom real;
 898
 899         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 900                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 901                 return -1;
 902         if (n != 0)
 903                 result = *p;
 904         XFree(p);
 905         return result;
 906 }
 907
 908 int
 909 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 910 {
 911         char **list = NULL;
 912         int n;
 913         XTextProperty name;
 914
 915         if (!text || size == 0)
 916                 return 0;
 917         text[0] = '\0';
 918         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
 919                 return 0;
 920         if (name.encoding == XA_STRING) {
 921                 strncpy(text, (char *)name.value, size - 1);
 922         } else if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 923                 strncpy(text, *list, size - 1);
 924                 XFreeStringList(list);
 925         }
 926         text[size - 1] = '\0';
 927         XFree(name.value);
 928         return 1;
 929 }
 930
 931 void
 932 grabbuttons(Client *c, int focused)
 933 {
 934         updatenumlockmask();
 935         {
 936                 unsigned int i, j;
 937                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 938                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 939                 if (!focused)
 940                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 941                                 BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
 942                 for (i = 0; i < LENGTH(buttons); i++)
 943                         if (buttons[i].click == ClkClientWin)
 944                                 for (j = 0; j < LENGTH(modifiers); j++)
 945                                         XGrabButton(dpy, buttons[i].button,
 946                                                 buttons[i].mask | modifiers[j],
 947                                                 c->win, False, BUTTONMASK,
 948                                                 GrabModeAsync, GrabModeSync, None, None);
 949         }
 950 }
 951
 952 void
 953 grabkeys(void)
 954 {
 955         updatenumlockmask();
 956         {
 957                 unsigned int i, j, k;
 958                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 959                 int start, end, skip;
 960                 KeySym *syms;
 961
 962                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 963                 XDisplayKeycodes(dpy, &start, &end);
 964                 syms = XGetKeyboardMapping(dpy, start, end - start + 1, &skip);
 965                 if (!syms)
 966                         return;
 967                 for (k = start; k <= end; k++)
 968                         for (i = 0; i < LENGTH(keys); i++)
 969                                 /* skip modifier codes, we do that ourselves */
 970                                 if (keys[i].keysym == syms[(k - start) * skip])
 971                                         for (j = 0; j < LENGTH(modifiers); j++)
 972                                                 XGrabKey(dpy, k,
 973                                                          keys[i].mod | modifiers[j],
 974                                                          root, True,
 975                                                          GrabModeAsync, GrabModeAsync);
 976                 XFree(syms);
 977         }
 978 }
 979
 980 void
 981 incnmaster(const Arg *arg)
 982 {
 983         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 984         arrange(selmon);
 985 }
 986
 987 #ifdef XINERAMA
 988 static int
 989 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 990 {
 991         while (n--)
 992                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 993                 && unique[n].width == info->width && unique[n].height == info->height)
 994                         return 0;
 995         return 1;
 996 }
 997 #endif /* XINERAMA */
 998
 999 void
1000 keypress(XEvent *e)
1001 {
1002         unsigned int i;
1003         KeySym keysym;
1004         XKeyEvent *ev;
1005
1006         ev = &e->xkey;
1007         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1008         for (i = 0; i < LENGTH(keys); i++)
1009                 if (keysym == keys[i].keysym
1010                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1011                 && keys[i].func)
1012                         keys[i].func(&(keys[i].arg));
1013 }
1014
1015 void
1016 killclient(const Arg *arg)
1017 {
1018         if (!selmon->sel)
1019                 return;
1020         if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1021                 XGrabServer(dpy);
1022                 XSetErrorHandler(xerrordummy);
1023                 XSetCloseDownMode(dpy, DestroyAll);
1024                 XKillClient(dpy, selmon->sel->win);
1025                 XSync(dpy, False);
1026                 XSetErrorHandler(xerror);
1027                 XUngrabServer(dpy);
1028         }
1029 }
1030
1031 void
1032 manage(Window w, XWindowAttributes *wa)
1033 {
1034         Client *c, *t = NULL;
1035         Window trans = None;
1036         XWindowChanges wc;
1037
1038         c = ecalloc(1, sizeof(Client));
1039         c->win = w;
1040         /* geometry */
1041         c->x = c->oldx = wa->x;
1042         c->y = c->oldy = wa->y;
1043         c->w = c->oldw = wa->width;
1044         c->h = c->oldh = wa->height;
1045         c->oldbw = wa->border_width;
1046
1047         updatetitle(c);
1048         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1049                 c->mon = t->mon;
1050                 c->tags = t->tags;
1051         } else {
1052                 c->mon = selmon;
1053                 applyrules(c);
1054         }
1055
1056         if (c->x + WIDTH(c) > c->mon->wx + c->mon->ww)
1057                 c->x = c->mon->wx + c->mon->ww - WIDTH(c);
1058         if (c->y + HEIGHT(c) > c->mon->wy + c->mon->wh)
1059                 c->y = c->mon->wy + c->mon->wh - HEIGHT(c);
1060         c->x = MAX(c->x, c->mon->wx);
1061         c->y = MAX(c->y, c->mon->wy);
1062         c->bw = borderpx;
1063
1064         wc.border_width = c->bw;
1065         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1066         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1067         configure(c); /* propagates border_width, if size doesn't change */
1068         updatewindowtype(c);
1069         updatesizehints(c);
1070         updatewmhints(c);
1071         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1072         grabbuttons(c, 0);
1073         if (!c->isfloating)
1074                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1075         if (c->isfloating)
1076                 XRaiseWindow(dpy, c->win);
1077         attach(c);
1078         attachstack(c);
1079         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1080                 (unsigned char *) &(c->win), 1);
1081         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1082         setclientstate(c, NormalState);
1083         if (c->mon == selmon)
1084                 unfocus(selmon->sel, 0);
1085         c->mon->sel = c;
1086         arrange(c->mon);
1087         XMapWindow(dpy, c->win);
1088         focus(NULL);
1089 }
1090
1091 void
1092 mappingnotify(XEvent *e)
1093 {
1094         XMappingEvent *ev = &e->xmapping;
1095
1096         XRefreshKeyboardMapping(ev);
1097         if (ev->request == MappingKeyboard)
1098                 grabkeys();
1099 }
1100
1101 void
1102 maprequest(XEvent *e)
1103 {
1104         static XWindowAttributes wa;
1105         XMapRequestEvent *ev = &e->xmaprequest;
1106
1107         if (!XGetWindowAttributes(dpy, ev->window, &wa) || wa.override_redirect)
1108                 return;
1109         if (!wintoclient(ev->window))
1110                 manage(ev->window, &wa);
1111 }
1112
1113 void
1114 monocle(Monitor *m)
1115 {
1116         unsigned int n = 0;
1117         Client *c;
1118
1119         for (c = m->clients; c; c = c->next)
1120                 if (ISVISIBLE(c))
1121                         n++;
1122         if (n > 0) /* override layout symbol */
1123                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1124         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1125                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1126 }
1127
1128 void
1129 motionnotify(XEvent *e)
1130 {
1131         static Monitor *mon = NULL;
1132         Monitor *m;
1133         XMotionEvent *ev = &e->xmotion;
1134
1135         if (ev->window != root)
1136                 return;
1137         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1138                 unfocus(selmon->sel, 1);
1139                 selmon = m;
1140                 focus(NULL);
1141         }
1142         mon = m;
1143 }
1144
1145 void
1146 movemouse(const Arg *arg)
1147 {
1148         int x, y, ocx, ocy, nx, ny;
1149         Client *c;
1150         Monitor *m;
1151         XEvent ev;
1152         Time lasttime = 0;
1153
1154         if (!(c = selmon->sel))
1155                 return;
1156         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1157                 return;
1158         restack(selmon);
1159         ocx = c->x;
1160         ocy = c->y;
1161         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1162                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1163                 return;
1164         if (!getrootptr(&x, &y))
1165                 return;
1166         do {
1167                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1168                 switch(ev.type) {
1169                 case ConfigureRequest:
1170                 case Expose:
1171                 case MapRequest:
1172                         handler[ev.type](&ev);
1173                         break;
1174                 case MotionNotify:
1175                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1176                                 continue;
1177                         lasttime = ev.xmotion.time;
1178
1179                         nx = ocx + (ev.xmotion.x - x);
1180                         ny = ocy + (ev.xmotion.y - y);
1181                         if (abs(selmon->wx - nx) < snap)
1182                                 nx = selmon->wx;
1183                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1184                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1185                         if (abs(selmon->wy - ny) < snap)
1186                                 ny = selmon->wy;
1187                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1188                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1189                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1190                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1191                                 togglefloating(NULL);
1192                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1193                                 resize(c, nx, ny, c->w, c->h, 1);
1194                         break;
1195                 }
1196         } while (ev.type != ButtonRelease);
1197         XUngrabPointer(dpy, CurrentTime);
1198         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1199                 sendmon(c, m);
1200                 selmon = m;
1201                 focus(NULL);
1202         }
1203 }
1204
1205 Client *
1206 nexttiled(Client *c)
1207 {
1208         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1209         return c;
1210 }
1211
1212 void
1213 pop(Client *c)
1214 {
1215         detach(c);
1216         attach(c);
1217         focus(c);
1218         arrange(c->mon);
1219 }
1220
1221 void
1222 propertynotify(XEvent *e)
1223 {
1224         Client *c;
1225         Window trans;
1226         XPropertyEvent *ev = &e->xproperty;
1227
1228         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1229                 updatestatus();
1230         else if (ev->state == PropertyDelete)
1231                 return; /* ignore */
1232         else if ((c = wintoclient(ev->window))) {
1233                 switch(ev->atom) {
1234                 default: break;
1235                 case XA_WM_TRANSIENT_FOR:
1236                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1237                                 (c->isfloating = (wintoclient(trans)) != NULL))
1238                                 arrange(c->mon);
1239                         break;
1240                 case XA_WM_NORMAL_HINTS:
1241                         c->hintsvalid = 0;
1242                         break;
1243                 case XA_WM_HINTS:
1244                         updatewmhints(c);
1245                         drawbars();
1246                         break;
1247                 }
1248                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1249                         updatetitle(c);
1250                         if (c == c->mon->sel)
1251                                 drawbar(c->mon);
1252                 }
1253                 if (ev->atom == netatom[NetWMWindowType])
1254                         updatewindowtype(c);
1255         }
1256 }
1257
1258 void
1259 quit(const Arg *arg)
1260 {
1261         running = 0;
1262 }
1263
1264 Monitor *
1265 recttomon(int x, int y, int w, int h)
1266 {
1267         Monitor *m, *r = selmon;
1268         int a, area = 0;
1269
1270         for (m = mons; m; m = m->next)
1271                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1272                         area = a;
1273                         r = m;
1274                 }
1275         return r;
1276 }
1277
1278 void
1279 resize(Client *c, int x, int y, int w, int h, int interact)
1280 {
1281         if (applysizehints(c, &x, &y, &w, &h, interact))
1282                 resizeclient(c, x, y, w, h);
1283 }
1284
1285 void
1286 resizeclient(Client *c, int x, int y, int w, int h)
1287 {
1288         XWindowChanges wc;
1289
1290         c->oldx = c->x; c->x = wc.x = x;
1291         c->oldy = c->y; c->y = wc.y = y;
1292         c->oldw = c->w; c->w = wc.width = w;
1293         c->oldh = c->h; c->h = wc.height = h;
1294         wc.border_width = c->bw;
1295         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1296         configure(c);
1297         XSync(dpy, False);
1298 }
1299
1300 void
1301 resizemouse(const Arg *arg)
1302 {
1303         int ocx, ocy, nw, nh;
1304         Client *c;
1305         Monitor *m;
1306         XEvent ev;
1307         Time lasttime = 0;
1308
1309         if (!(c = selmon->sel))
1310                 return;
1311         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1312                 return;
1313         restack(selmon);
1314         ocx = c->x;
1315         ocy = c->y;
1316         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1317                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1318                 return;
1319         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1320         do {
1321                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1322                 switch(ev.type) {
1323                 case ConfigureRequest:
1324                 case Expose:
1325                 case MapRequest:
1326                         handler[ev.type](&ev);
1327                         break;
1328                 case MotionNotify:
1329                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1330                                 continue;
1331                         lasttime = ev.xmotion.time;
1332
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 (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1336                         && c->mon->wy + nh >= selmon->wy && c->mon->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, 1);
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 = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1351                 sendmon(c, m);
1352                 selmon = m;
1353                 focus(NULL);
1354         }
1355 }
1356
1357 void
1358 restack(Monitor *m)
1359 {
1360         Client *c;
1361         XEvent ev;
1362         XWindowChanges wc;
1363
1364         drawbar(m);
1365         if (!m->sel)
1366                 return;
1367         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1368                 XRaiseWindow(dpy, m->sel->win);
1369         if (m->lt[m->sellt]->arrange) {
1370                 wc.stack_mode = Below;
1371                 wc.sibling = m->barwin;
1372                 for (c = m->stack; c; c = c->snext)
1373                         if (!c->isfloating && ISVISIBLE(c)) {
1374                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1375                                 wc.sibling = c->win;
1376                         }
1377         }
1378         XSync(dpy, False);
1379         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1380 }
1381
1382 void
1383 run(void)
1384 {
1385         XEvent ev;
1386         /* main event loop */
1387         XSync(dpy, False);
1388         while (running && !XNextEvent(dpy, &ev))
1389                 if (handler[ev.type])
1390                         handler[ev.type](&ev); /* call handler */
1391 }
1392
1393 void
1394 scan(void)
1395 {
1396         unsigned int i, num;
1397         Window d1, d2, *wins = NULL;
1398         XWindowAttributes wa;
1399
1400         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1401                 for (i = 0; i < num; i++) {
1402                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1403                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1404                                 continue;
1405                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1406                                 manage(wins[i], &wa);
1407                 }
1408                 for (i = 0; i < num; i++) { /* now the transients */
1409                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1410                                 continue;
1411                         if (XGetTransientForHint(dpy, wins[i], &d1)
1412                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1413                                 manage(wins[i], &wa);
1414                 }
1415                 if (wins)
1416                         XFree(wins);
1417         }
1418 }
1419
1420 void
1421 sendmon(Client *c, Monitor *m)
1422 {
1423         if (c->mon == m)
1424                 return;
1425         unfocus(c, 1);
1426         detach(c);
1427         detachstack(c);
1428         c->mon = m;
1429         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1430         attach(c);
1431         attachstack(c);
1432         focus(NULL);
1433         arrange(NULL);
1434 }
1435
1436 void
1437 setclientstate(Client *c, long state)
1438 {
1439         long data[] = { state, None };
1440
1441         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1442                 PropModeReplace, (unsigned char *)data, 2);
1443 }
1444
1445 int
1446 sendevent(Client *c, Atom proto)
1447 {
1448         int n;
1449         Atom *protocols;
1450         int exists = 0;
1451         XEvent ev;
1452
1453         if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1454                 while (!exists && n--)
1455                         exists = protocols[n] == proto;
1456                 XFree(protocols);
1457         }
1458         if (exists) {
1459                 ev.type = ClientMessage;
1460                 ev.xclient.window = c->win;
1461                 ev.xclient.message_type = wmatom[WMProtocols];
1462                 ev.xclient.format = 32;
1463                 ev.xclient.data.l[0] = proto;
1464                 ev.xclient.data.l[1] = CurrentTime;
1465                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1466         }
1467         return exists;
1468 }
1469
1470 void
1471 setfocus(Client *c)
1472 {
1473         if (!c->neverfocus) {
1474                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1475                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1476                         XA_WINDOW, 32, PropModeReplace,
1477                         (unsigned char *) &(c->win), 1);
1478         }
1479         sendevent(c, wmatom[WMTakeFocus]);
1480 }
1481
1482 void
1483 setfullscreen(Client *c, int fullscreen)
1484 {
1485         if (fullscreen && !c->isfullscreen) {
1486                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1487                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1488                 c->isfullscreen = 1;
1489                 c->oldstate = c->isfloating;
1490                 c->oldbw = c->bw;
1491                 c->bw = 0;
1492                 c->isfloating = 1;
1493                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1494                 XRaiseWindow(dpy, c->win);
1495         } else if (!fullscreen && c->isfullscreen){
1496                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1497                         PropModeReplace, (unsigned char*)0, 0);
1498                 c->isfullscreen = 0;
1499                 c->isfloating = c->oldstate;
1500                 c->bw = c->oldbw;
1501                 c->x = c->oldx;
1502                 c->y = c->oldy;
1503                 c->w = c->oldw;
1504                 c->h = c->oldh;
1505                 resizeclient(c, c->x, c->y, c->w, c->h);
1506                 arrange(c->mon);
1507         }
1508 }
1509
1510 void
1511 setlayout(const Arg *arg)
1512 {
1513         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1514                 selmon->sellt ^= 1;
1515         if (arg && arg->v)
1516                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1517         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1518         if (selmon->sel)
1519                 arrange(selmon);
1520         else
1521                 drawbar(selmon);
1522 }
1523
1524 /* arg > 1.0 will set mfact absolutely */
1525 void
1526 setmfact(const Arg *arg)
1527 {
1528         float f;
1529
1530         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1531                 return;
1532         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1533         if (f < 0.05 || f > 0.95)
1534                 return;
1535         selmon->mfact = f;
1536         arrange(selmon);
1537 }
1538
1539 void
1540 setup(void)
1541 {
1542         int i;
1543         XSetWindowAttributes wa;
1544         Atom utf8string;
1545         struct sigaction sa;
1546
1547         /* do not transform children into zombies when they terminate */
1548         sigemptyset(&sa.sa_mask);
1549         sa.sa_flags = SA_NOCLDSTOP | SA_NOCLDWAIT | SA_RESTART;
1550         sa.sa_handler = SIG_IGN;
1551         sigaction(SIGCHLD, &sa, NULL);
1552
1553         /* clean up any zombies (inherited from .xinitrc etc) immediately */
1554         while (waitpid(-1, NULL, WNOHANG) > 0);
1555
1556         /* init screen */
1557         screen = DefaultScreen(dpy);
1558         sw = DisplayWidth(dpy, screen);
1559         sh = DisplayHeight(dpy, screen);
1560         root = RootWindow(dpy, screen);
1561         drw = drw_create(dpy, screen, root, sw, sh);
1562         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1563                 die("no fonts could be loaded.");
1564         lrpad = drw->fonts->h;
1565         bh = drw->fonts->h + 2;
1566         updategeom();
1567         /* init atoms */
1568         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1569         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1570         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1571         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1572         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1573         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1574         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1575         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1576         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1577         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1578         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1579         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1580         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1581         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1582         /* init cursors */
1583         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1584         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1585         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1586         /* init appearance */
1587         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1588         for (i = 0; i < LENGTH(colors); i++)
1589                 scheme[i] = drw_scm_create(drw, colors[i], 3);
1590         /* init bars */
1591         updatebars();
1592         updatestatus();
1593         /* supporting window for NetWMCheck */
1594         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1595         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1596                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1597         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1598                 PropModeReplace, (unsigned char *) "dwm", 3);
1599         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1600                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1601         /* EWMH support per view */
1602         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1603                 PropModeReplace, (unsigned char *) netatom, NetLast);
1604         XDeleteProperty(dpy, root, netatom[NetClientList]);
1605         /* select events */
1606         wa.cursor = cursor[CurNormal]->cursor;
1607         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1608                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1609                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1610         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1611         XSelectInput(dpy, root, wa.event_mask);
1612         grabkeys();
1613         focus(NULL);
1614 }
1615
1616 void
1617 seturgent(Client *c, int urg)
1618 {
1619         XWMHints *wmh;
1620
1621         c->isurgent = urg;
1622         if (!(wmh = XGetWMHints(dpy, c->win)))
1623                 return;
1624         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1625         XSetWMHints(dpy, c->win, wmh);
1626         XFree(wmh);
1627 }
1628
1629 void
1630 showhide(Client *c)
1631 {
1632         if (!c)
1633                 return;
1634         if (ISVISIBLE(c)) {
1635                 /* show clients top down */
1636                 XMoveWindow(dpy, c->win, c->x, c->y);
1637                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1638                         resize(c, c->x, c->y, c->w, c->h, 0);
1639                 showhide(c->snext);
1640         } else {
1641                 /* hide clients bottom up */
1642                 showhide(c->snext);
1643                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1644         }
1645 }
1646
1647 void
1648 spawn(const Arg *arg)
1649 {
1650         if (arg->v == dmenucmd)
1651                 dmenumon[0] = '0' + selmon->num;
1652         if (fork() == 0) {
1653                 if (dpy)
1654                         close(ConnectionNumber(dpy));
1655                 setsid();
1656                 execvp(((char **)arg->v)[0], (char **)arg->v);
1657                 die("dwm: execvp '%s' failed:", ((char **)arg->v)[0]);
1658         }
1659 }
1660
1661 void
1662 tag(const Arg *arg)
1663 {
1664         if (selmon->sel && arg->ui & TAGMASK) {
1665                 selmon->sel->tags = arg->ui & TAGMASK;
1666                 focus(NULL);
1667                 arrange(selmon);
1668         }
1669 }
1670
1671 void
1672 tagmon(const Arg *arg)
1673 {
1674         if (!selmon->sel || !mons->next)
1675                 return;
1676         sendmon(selmon->sel, dirtomon(arg->i));
1677 }
1678
1679 void
1680 tile(Monitor *m)
1681 {
1682         unsigned int i, n, h, mw, my, ty;
1683         Client *c;
1684
1685         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1686         if (n == 0)
1687                 return;
1688
1689         if (n > m->nmaster)
1690                 mw = m->nmaster ? m->ww * m->mfact : 0;
1691         else
1692                 mw = m->ww;
1693         for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1694                 if (i < m->nmaster) {
1695                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1696                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1697                         if (my + HEIGHT(c) < m->wh)
1698                                 my += HEIGHT(c);
1699                 } else {
1700                         h = (m->wh - ty) / (n - i);
1701                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1702                         if (ty + HEIGHT(c) < m->wh)
1703                                 ty += HEIGHT(c);
1704                 }
1705 }
1706
1707 void
1708 togglebar(const Arg *arg)
1709 {
1710         selmon->showbar = !selmon->showbar;
1711         updatebarpos(selmon);
1712         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1713         arrange(selmon);
1714 }
1715
1716 void
1717 togglefloating(const Arg *arg)
1718 {
1719         if (!selmon->sel)
1720                 return;
1721         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1722                 return;
1723         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1724         if (selmon->sel->isfloating)
1725                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1726                         selmon->sel->w, selmon->sel->h, 0);
1727         arrange(selmon);
1728 }
1729
1730 void
1731 toggletag(const Arg *arg)
1732 {
1733         unsigned int newtags;
1734
1735         if (!selmon->sel)
1736                 return;
1737         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1738         if (newtags) {
1739                 selmon->sel->tags = newtags;
1740                 focus(NULL);
1741                 arrange(selmon);
1742         }
1743 }
1744
1745 void
1746 toggleview(const Arg *arg)
1747 {
1748         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1749
1750         if (newtagset) {
1751                 selmon->tagset[selmon->seltags] = newtagset;
1752                 focus(NULL);
1753                 arrange(selmon);
1754         }
1755 }
1756
1757 void
1758 unfocus(Client *c, int setfocus)
1759 {
1760         if (!c)
1761                 return;
1762         grabbuttons(c, 0);
1763         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1764         if (setfocus) {
1765                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1766                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1767         }
1768 }
1769
1770 void
1771 unmanage(Client *c, int destroyed)
1772 {
1773         Monitor *m = c->mon;
1774         XWindowChanges wc;
1775
1776         detach(c);
1777         detachstack(c);
1778         if (!destroyed) {
1779                 wc.border_width = c->oldbw;
1780                 XGrabServer(dpy); /* avoid race conditions */
1781                 XSetErrorHandler(xerrordummy);
1782                 XSelectInput(dpy, c->win, NoEventMask);
1783                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1784                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1785                 setclientstate(c, WithdrawnState);
1786                 XSync(dpy, False);
1787                 XSetErrorHandler(xerror);
1788                 XUngrabServer(dpy);
1789         }
1790         free(c);
1791         focus(NULL);
1792         updateclientlist();
1793         arrange(m);
1794 }
1795
1796 void
1797 unmapnotify(XEvent *e)
1798 {
1799         Client *c;
1800         XUnmapEvent *ev = &e->xunmap;
1801
1802         if ((c = wintoclient(ev->window))) {
1803                 if (ev->send_event)
1804                         setclientstate(c, WithdrawnState);
1805                 else
1806                         unmanage(c, 0);
1807         }
1808 }
1809
1810 void
1811 updatebars(void)
1812 {
1813         Monitor *m;
1814         XSetWindowAttributes wa = {
1815                 .override_redirect = True,
1816                 .background_pixmap = ParentRelative,
1817                 .event_mask = ButtonPressMask|ExposureMask
1818         };
1819         XClassHint ch = {"dwm", "dwm"};
1820         for (m = mons; m; m = m->next) {
1821                 if (m->barwin)
1822                         continue;
1823                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1824                                 CopyFromParent, DefaultVisual(dpy, screen),
1825                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1826                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1827                 XMapRaised(dpy, m->barwin);
1828                 XSetClassHint(dpy, m->barwin, &ch);
1829         }
1830 }
1831
1832 void
1833 updatebarpos(Monitor *m)
1834 {
1835         m->wy = m->my;
1836         m->wh = m->mh;
1837         if (m->showbar) {
1838                 m->wh -= bh;
1839                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1840                 m->wy = m->topbar ? m->wy + bh : m->wy;
1841         } else
1842                 m->by = -bh;
1843 }
1844
1845 void
1846 updateclientlist()
1847 {
1848         Client *c;
1849         Monitor *m;
1850
1851         XDeleteProperty(dpy, root, netatom[NetClientList]);
1852         for (m = mons; m; m = m->next)
1853                 for (c = m->clients; c; c = c->next)
1854                         XChangeProperty(dpy, root, netatom[NetClientList],
1855                                 XA_WINDOW, 32, PropModeAppend,
1856                                 (unsigned char *) &(c->win), 1);
1857 }
1858
1859 int
1860 updategeom(void)
1861 {
1862         int dirty = 0;
1863
1864 #ifdef XINERAMA
1865         if (XineramaIsActive(dpy)) {
1866                 int i, j, n, nn;
1867                 Client *c;
1868                 Monitor *m;
1869                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1870                 XineramaScreenInfo *unique = NULL;
1871
1872                 for (n = 0, m = mons; m; m = m->next, n++);
1873                 /* only consider unique geometries as separate screens */
1874                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1875                 for (i = 0, j = 0; i < nn; i++)
1876                         if (isuniquegeom(unique, j, &info[i]))
1877                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1878                 XFree(info);
1879                 nn = j;
1880
1881                 /* new monitors if nn > n */
1882                 for (i = n; i < nn; i++) {
1883                         for (m = mons; m && m->next; m = m->next);
1884                         if (m)
1885                                 m->next = createmon();
1886                         else
1887                                 mons = createmon();
1888                 }
1889                 for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1890                         if (i >= n
1891                         || unique[i].x_org != m->mx || unique[i].y_org != m->my
1892                         || unique[i].width != m->mw || unique[i].height != m->mh)
1893                         {
1894                                 dirty = 1;
1895                                 m->num = i;
1896                                 m->mx = m->wx = unique[i].x_org;
1897                                 m->my = m->wy = unique[i].y_org;
1898                                 m->mw = m->ww = unique[i].width;
1899                                 m->mh = m->wh = unique[i].height;
1900                                 updatebarpos(m);
1901                         }
1902                 /* removed monitors if n > nn */
1903                 for (i = nn; i < n; i++) {
1904                         for (m = mons; m && m->next; m = m->next);
1905                         while ((c = m->clients)) {
1906                                 dirty = 1;
1907                                 m->clients = c->next;
1908                                 detachstack(c);
1909                                 c->mon = mons;
1910                                 attach(c);
1911                                 attachstack(c);
1912                         }
1913                         if (m == selmon)
1914                                 selmon = mons;
1915                         cleanupmon(m);
1916                 }
1917                 free(unique);
1918         } else
1919 #endif /* XINERAMA */
1920         { /* default monitor setup */
1921                 if (!mons)
1922                         mons = createmon();
1923                 if (mons->mw != sw || mons->mh != sh) {
1924                         dirty = 1;
1925                         mons->mw = mons->ww = sw;
1926                         mons->mh = mons->wh = sh;
1927                         updatebarpos(mons);
1928                 }
1929         }
1930         if (dirty) {
1931                 selmon = mons;
1932                 selmon = wintomon(root);
1933         }
1934         return dirty;
1935 }
1936
1937 void
1938 updatenumlockmask(void)
1939 {
1940         unsigned int i, j;
1941         XModifierKeymap *modmap;
1942
1943         numlockmask = 0;
1944         modmap = XGetModifierMapping(dpy);
1945         for (i = 0; i < 8; i++)
1946                 for (j = 0; j < modmap->max_keypermod; j++)
1947                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
1948                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
1949                                 numlockmask = (1 << i);
1950         XFreeModifiermap(modmap);
1951 }
1952
1953 void
1954 updatesizehints(Client *c)
1955 {
1956         long msize;
1957         XSizeHints size;
1958
1959         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1960                 /* size is uninitialized, ensure that size.flags aren't used */
1961                 size.flags = PSize;
1962         if (size.flags & PBaseSize) {
1963                 c->basew = size.base_width;
1964                 c->baseh = size.base_height;
1965         } else if (size.flags & PMinSize) {
1966                 c->basew = size.min_width;
1967                 c->baseh = size.min_height;
1968         } else
1969                 c->basew = c->baseh = 0;
1970         if (size.flags & PResizeInc) {
1971                 c->incw = size.width_inc;
1972                 c->inch = size.height_inc;
1973         } else
1974                 c->incw = c->inch = 0;
1975         if (size.flags & PMaxSize) {
1976                 c->maxw = size.max_width;
1977                 c->maxh = size.max_height;
1978         } else
1979                 c->maxw = c->maxh = 0;
1980         if (size.flags & PMinSize) {
1981                 c->minw = size.min_width;
1982                 c->minh = size.min_height;
1983         } else if (size.flags & PBaseSize) {
1984                 c->minw = size.base_width;
1985                 c->minh = size.base_height;
1986         } else
1987                 c->minw = c->minh = 0;
1988         if (size.flags & PAspect) {
1989                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1990                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1991         } else
1992                 c->maxa = c->mina = 0.0;
1993         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
1994         c->hintsvalid = 1;
1995 }
1996
1997 void
1998 updatestatus(void)
1999 {
2000         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2001                 strcpy(stext, "dwm-"VERSION);
2002         drawbar(selmon);
2003 }
2004
2005 void
2006 updatetitle(Client *c)
2007 {
2008         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2009                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2010         if (c->name[0] == '\0') /* hack to mark broken clients */
2011                 strcpy(c->name, broken);
2012 }
2013
2014 void
2015 updatewindowtype(Client *c)
2016 {
2017         Atom state = getatomprop(c, netatom[NetWMState]);
2018         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2019
2020         if (state == netatom[NetWMFullscreen])
2021                 setfullscreen(c, 1);
2022         if (wtype == netatom[NetWMWindowTypeDialog])
2023                 c->isfloating = 1;
2024 }
2025
2026 void
2027 updatewmhints(Client *c)
2028 {
2029         XWMHints *wmh;
2030
2031         if ((wmh = XGetWMHints(dpy, c->win))) {
2032                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2033                         wmh->flags &= ~XUrgencyHint;
2034                         XSetWMHints(dpy, c->win, wmh);
2035                 } else
2036                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2037                 if (wmh->flags & InputHint)
2038                         c->neverfocus = !wmh->input;
2039                 else
2040                         c->neverfocus = 0;
2041                 XFree(wmh);
2042         }
2043 }
2044
2045 void
2046 view(const Arg *arg)
2047 {
2048         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2049                 return;
2050         selmon->seltags ^= 1; /* toggle sel tagset */
2051         if (arg->ui & TAGMASK)
2052                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2053         focus(NULL);
2054         arrange(selmon);
2055 }
2056
2057 Client *
2058 wintoclient(Window w)
2059 {
2060         Client *c;
2061         Monitor *m;
2062
2063         for (m = mons; m; m = m->next)
2064                 for (c = m->clients; c; c = c->next)
2065                         if (c->win == w)
2066                                 return c;
2067         return NULL;
2068 }
2069
2070 Monitor *
2071 wintomon(Window w)
2072 {
2073         int x, y;
2074         Client *c;
2075         Monitor *m;
2076
2077         if (w == root && getrootptr(&x, &y))
2078                 return recttomon(x, y, 1, 1);
2079         for (m = mons; m; m = m->next)
2080                 if (w == m->barwin)
2081                         return m;
2082         if ((c = wintoclient(w)))
2083                 return c->mon;
2084         return selmon;
2085 }
2086
2087 /* There's no way to check accesses to destroyed windows, thus those cases are
2088  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2089  * default error handler, which may call exit. */
2090 int
2091 xerror(Display *dpy, XErrorEvent *ee)
2092 {
2093         if (ee->error_code == BadWindow
2094         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2095         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2096         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2097         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2098         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2099         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2100         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2101         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2102                 return 0;
2103         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2104                 ee->request_code, ee->error_code);
2105         return xerrorxlib(dpy, ee); /* may call exit */
2106 }
2107
2108 int
2109 xerrordummy(Display *dpy, XErrorEvent *ee)
2110 {
2111         return 0;
2112 }
2113
2114 /* Startup Error handler to check if another window manager
2115  * is already running. */
2116 int
2117 xerrorstart(Display *dpy, XErrorEvent *ee)
2118 {
2119         die("dwm: another window manager is already running");
2120         return -1;
2121 }
2122
2123 void
2124 zoom(const Arg *arg)
2125 {
2126         Client *c = selmon->sel;
2127
2128         if (!selmon->lt[selmon->sellt]->arrange || !c || c->isfloating)
2129                 return;
2130         if (c == nexttiled(selmon->clients) && !(c = nexttiled(c->next)))
2131                 return;
2132         pop(c);
2133 }
2134
2135 int
2136 main(int argc, char *argv[])
2137 {
2138         if (argc == 2 && !strcmp("-v", argv[1]))
2139                 die("dwm-"VERSION);
2140         else if (argc != 1)
2141                 die("usage: dwm [-v]");
2142         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2143                 fputs("warning: no locale support\n", stderr);
2144         if (!(dpy = XOpenDisplay(NULL)))
2145                 die("dwm: cannot open display");
2146         checkotherwm();
2147         setup();
2148 #ifdef __OpenBSD__
2149         if (pledge("stdio rpath proc exec", NULL) == -1)
2150                 die("pledge");
2151 #endif /* __OpenBSD__ */
2152         scan();
2153         run();
2154         cleanup();
2155         XCloseDisplay(dpy);
2156         return EXIT_SUCCESS;
2157 }