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;
  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 *);
 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 sigchld(int unused);
 209 static void spawn(const Arg *arg);
 210 static void tag(const Arg *arg);
 211 static void tagmon(const Arg *arg);
 212 static void tile(Monitor *);
 213 static void togglebar(const Arg *arg);
 214 static void togglefloating(const Arg *arg);
 215 static void toggletag(const Arg *arg);
 216 static void toggleview(const Arg *arg);
 217 static void unfocus(Client *c, int setfocus);
 218 static void unmanage(Client *c, int destroyed);
 219 static void unmapnotify(XEvent *e);
 220 static void updatebarpos(Monitor *m);
 221 static void updatebars(void);
 222 static void updateclientlist(void);
 223 static int updategeom(void);
 224 static void updatenumlockmask(void);
 225 static void updatesizehints(Client *c);
 226 static void updatestatus(void);
 227 static void updatetitle(Client *c);
 228 static void updatewindowtype(Client *c);
 229 static void updatewmhints(Client *c);
 230 static void view(const Arg *arg);
 231 static Client *wintoclient(Window w);
 232 static Monitor *wintomon(Window w);
 233 static int xerror(Display *dpy, XErrorEvent *ee);
 234 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 235 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 236 static void zoom(const Arg *arg);
 237
 238 /* variables */
 239 static const char broken[] = "broken";
 240 static char stext[256];
 241 static int screen;
 242 static int sw, sh;           /* X display screen geometry width, height */
 243 static int bh, blw = 0;      /* bar geometry */
 244 static int lrpad;            /* sum of left and right padding for text */
 245 static int (*xerrorxlib)(Display *, XErrorEvent *);
 246 static unsigned int numlockmask = 0;
 247 static void (*handler[LASTEvent]) (XEvent *) = {
 248         [ButtonPress] = buttonpress,
 249         [ClientMessage] = clientmessage,
 250         [ConfigureRequest] = configurerequest,
 251         [ConfigureNotify] = configurenotify,
 252         [DestroyNotify] = destroynotify,
 253         [EnterNotify] = enternotify,
 254         [Expose] = expose,
 255         [FocusIn] = focusin,
 256         [KeyPress] = keypress,
 257         [MappingNotify] = mappingnotify,
 258         [MapRequest] = maprequest,
 259         [MotionNotify] = motionnotify,
 260         [PropertyNotify] = propertynotify,
 261         [UnmapNotify] = unmapnotify
 262 };
 263 static Atom wmatom[WMLast], netatom[NetLast];
 264 static int running = 1;
 265 static Cur *cursor[CurLast];
 266 static Clr **scheme;
 267 static Display *dpy;
 268 static Drw *drw;
 269 static Monitor *mons, *selmon;
 270 static Window root, wmcheckwin;
 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 {
 282         const char *class, *instance;
 283         unsigned int i;
 284         const Rule *r;
 285         Monitor *m;
 286         XClassHint ch = { NULL, NULL };
 287
 288         /* rule matching */
 289         c->isfloating = 0;
 290         c->tags = 0;
 291         XGetClassHint(dpy, c->win, &ch);
 292         class    = ch.res_class ? ch.res_class : broken;
 293         instance = ch.res_name  ? ch.res_name  : broken;
 294
 295         for (i = 0; i < LENGTH(rules); i++) {
 296                 r = &rules[i];
 297                 if ((!r->title || strstr(c->name, r->title))
 298                 && (!r->class || strstr(class, r->class))
 299                 && (!r->instance || strstr(instance, r->instance)))
 300                 {
 301                         c->isfloating = r->isfloating;
 302                         c->tags |= r->tags;
 303                         for (m = mons; m && m->num != r->monitor; m = m->next);
 304                         if (m)
 305                                 c->mon = m;
 306                 }
 307         }
 308         if (ch.res_class)
 309                 XFree(ch.res_class);
 310         if (ch.res_name)
 311                 XFree(ch.res_name);
 312         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 313 }
 314
 315 int
 316 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 317 {
 318         int baseismin;
 319         Monitor *m = c->mon;
 320
 321         /* set minimum possible */
 322         *w = MAX(1, *w);
 323         *h = MAX(1, *h);
 324         if (interact) {
 325                 if (*x > sw)
 326                         *x = sw - WIDTH(c);
 327                 if (*y > sh)
 328                         *y = sh - HEIGHT(c);
 329                 if (*x + *w + 2 * c->bw < 0)
 330                         *x = 0;
 331                 if (*y + *h + 2 * c->bw < 0)
 332                         *y = 0;
 333         } else {
 334                 if (*x >= m->wx + m->ww)
 335                         *x = m->wx + m->ww - WIDTH(c);
 336                 if (*y >= m->wy + m->wh)
 337                         *y = m->wy + m->wh - HEIGHT(c);
 338                 if (*x + *w + 2 * c->bw <= m->wx)
 339                         *x = m->wx;
 340                 if (*y + *h + 2 * c->bw <= m->wy)
 341                         *y = m->wy;
 342         }
 343         if (*h < bh)
 344                 *h = bh;
 345         if (*w < bh)
 346                 *w = bh;
 347         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 348                 /* see last two sentences in ICCCM 4.1.2.3 */
 349                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 350                 if (!baseismin) { /* temporarily remove base dimensions */
 351                         *w -= c->basew;
 352                         *h -= c->baseh;
 353                 }
 354                 /* adjust for aspect limits */
 355                 if (c->mina > 0 && c->maxa > 0) {
 356                         if (c->maxa < (float)*w / *h)
 357                                 *w = *h * c->maxa + 0.5;
 358                         else if (c->mina < (float)*h / *w)
 359                                 *h = *w * c->mina + 0.5;
 360                 }
 361                 if (baseismin) { /* increment calculation requires this */
 362                         *w -= c->basew;
 363                         *h -= c->baseh;
 364                 }
 365                 /* adjust for increment value */
 366                 if (c->incw)
 367                         *w -= *w % c->incw;
 368                 if (c->inch)
 369                         *h -= *h % c->inch;
 370                 /* restore base dimensions */
 371                 *w = MAX(*w + c->basew, c->minw);
 372                 *h = MAX(*h + c->baseh, 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(Monitor *m)
 383 {
 384         if (m)
 385                 showhide(m->stack);
 386         else for (m = mons; m; m = m->next)
 387                 showhide(m->stack);
 388         if (m) {
 389                 arrangemon(m);
 390                 restack(m);
 391         } else for (m = mons; m; m = m->next)
 392                 arrangemon(m);
 393 }
 394
 395 void
 396 arrangemon(Monitor *m)
 397 {
 398         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 399         if (m->lt[m->sellt]->arrange)
 400                 m->lt[m->sellt]->arrange(m);
 401 }
 402
 403 void
 404 attach(Client *c)
 405 {
 406         c->next = c->mon->clients;
 407         c->mon->clients = c;
 408 }
 409
 410 void
 411 attachstack(Client *c)
 412 {
 413         c->snext = c->mon->stack;
 414         c->mon->stack = c;
 415 }
 416
 417 void
 418 buttonpress(XEvent *e)
 419 {
 420         unsigned int i, x, click;
 421         Arg arg = {0};
 422         Client *c;
 423         Monitor *m;
 424         XButtonPressedEvent *ev = &e->xbutton;
 425
 426         click = ClkRootWin;
 427         /* focus monitor if necessary */
 428         if ((m = wintomon(ev->window)) && m != selmon) {
 429                 unfocus(selmon->sel, 1);
 430                 selmon = m;
 431                 focus(NULL);
 432         }
 433         if (ev->window == selmon->barwin) {
 434                 i = x = 0;
 435                 do
 436                         x += TEXTW(tags[i]);
 437                 while (ev->x >= x && ++i < LENGTH(tags));
 438                 if (i < LENGTH(tags)) {
 439                         click = ClkTagBar;
 440                         arg.ui = 1 << i;
 441                 } else if (ev->x < x + blw)
 442                         click = ClkLtSymbol;
 443                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 444                         click = ClkStatusText;
 445                 else
 446                         click = ClkWinTitle;
 447         } else if ((c = wintoclient(ev->window))) {
 448                 focus(c);
 449                 restack(selmon);
 450                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 451                 click = ClkClientWin;
 452         }
 453         for (i = 0; i < LENGTH(buttons); i++)
 454                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 455                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 456                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 457 }
 458
 459 void
 460 checkotherwm(void)
 461 {
 462         xerrorxlib = XSetErrorHandler(xerrorstart);
 463         /* this causes an error if some other window manager is running */
 464         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 465         XSync(dpy, False);
 466         XSetErrorHandler(xerror);
 467         XSync(dpy, False);
 468 }
 469
 470 void
 471 cleanup(void)
 472 {
 473         Arg a = {.ui = ~0};
 474         Layout foo = { "", NULL };
 475         Monitor *m;
 476         size_t i;
 477
 478         view(&a);
 479         selmon->lt[selmon->sellt] = &foo;
 480         for (m = mons; m; m = m->next)
 481                 while (m->stack)
 482                         unmanage(m->stack, 0);
 483         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 484         while (mons)
 485                 cleanupmon(mons);
 486         for (i = 0; i < CurLast; i++)
 487                 drw_cur_free(drw, cursor[i]);
 488         for (i = 0; i < LENGTH(colors); i++)
 489                 free(scheme[i]);
 490         XDestroyWindow(dpy, wmcheckwin);
 491         drw_free(drw);
 492         XSync(dpy, False);
 493         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 494         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 495 }
 496
 497 void
 498 cleanupmon(Monitor *mon)
 499 {
 500         Monitor *m;
 501
 502         if (mon == mons)
 503                 mons = mons->next;
 504         else {
 505                 for (m = mons; m && m->next != mon; m = m->next);
 506                 m->next = mon->next;
 507         }
 508         XUnmapWindow(dpy, mon->barwin);
 509         XDestroyWindow(dpy, mon->barwin);
 510         free(mon);
 511 }
 512
 513 void
 514 clientmessage(XEvent *e)
 515 {
 516         XClientMessageEvent *cme = &e->xclient;
 517         Client *c = wintoclient(cme->window);
 518
 519         if (!c)
 520                 return;
 521         if (cme->message_type == netatom[NetWMState]) {
 522                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 523                 || cme->data.l[2] == netatom[NetWMFullscreen])
 524                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 525                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 526         } else if (cme->message_type == netatom[NetActiveWindow]) {
 527                 if (c != selmon->sel && !c->isurgent)
 528                         seturgent(c, 1);
 529         }
 530 }
 531
 532 void
 533 configure(Client *c)
 534 {
 535         XConfigureEvent ce;
 536
 537         ce.type = ConfigureNotify;
 538         ce.display = dpy;
 539         ce.event = c->win;
 540         ce.window = c->win;
 541         ce.x = c->x;
 542         ce.y = c->y;
 543         ce.width = c->w;
 544         ce.height = c->h;
 545         ce.border_width = c->bw;
 546         ce.above = None;
 547         ce.override_redirect = False;
 548         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 549 }
 550
 551 void
 552 configurenotify(XEvent *e)
 553 {
 554         Monitor *m;
 555         Client *c;
 556         XConfigureEvent *ev = &e->xconfigure;
 557         int dirty;
 558
 559         /* TODO: updategeom handling sucks, needs to be simplified */
 560         if (ev->window == root) {
 561                 dirty = (sw != ev->width || sh != ev->height);
 562                 sw = ev->width;
 563                 sh = ev->height;
 564                 if (updategeom() || dirty) {
 565                         drw_resize(drw, sw, bh);
 566                         updatebars();
 567                         for (m = mons; m; m = m->next) {
 568                                 for (c = m->clients; c; c = c->next)
 569                                         if (c->isfullscreen)
 570                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 571                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 572                         }
 573                         focus(NULL);
 574                         arrange(NULL);
 575                 }
 576         }
 577 }
 578
 579 void
 580 configurerequest(XEvent *e)
 581 {
 582         Client *c;
 583         Monitor *m;
 584         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 585         XWindowChanges wc;
 586
 587         if ((c = wintoclient(ev->window))) {
 588                 if (ev->value_mask & CWBorderWidth)
 589                         c->bw = ev->border_width;
 590                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 591                         m = c->mon;
 592                         if (ev->value_mask & CWX) {
 593                                 c->oldx = c->x;
 594                                 c->x = m->mx + ev->x;
 595                         }
 596                         if (ev->value_mask & CWY) {
 597                                 c->oldy = c->y;
 598                                 c->y = m->my + ev->y;
 599                         }
 600                         if (ev->value_mask & CWWidth) {
 601                                 c->oldw = c->w;
 602                                 c->w = ev->width;
 603                         }
 604                         if (ev->value_mask & CWHeight) {
 605                                 c->oldh = c->h;
 606                                 c->h = ev->height;
 607                         }
 608                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 609                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 610                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 611                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 612                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 613                                 configure(c);
 614                         if (ISVISIBLE(c))
 615                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 616                 } else
 617                         configure(c);
 618         } else {
 619                 wc.x = ev->x;
 620                 wc.y = ev->y;
 621                 wc.width = ev->width;
 622                 wc.height = ev->height;
 623                 wc.border_width = ev->border_width;
 624                 wc.sibling = ev->above;
 625                 wc.stack_mode = ev->detail;
 626                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 627         }
 628         XSync(dpy, False);
 629 }
 630
 631 Monitor *
 632 createmon(void)
 633 {
 634         Monitor *m;
 635
 636         m = ecalloc(1, sizeof(Monitor));
 637         m->tagset[0] = m->tagset[1] = 1;
 638         m->mfact = mfact;
 639         m->nmaster = nmaster;
 640         m->showbar = showbar;
 641         m->topbar = topbar;
 642         m->lt[0] = &layouts[0];
 643         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 644         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 645         return m;
 646 }
 647
 648 void
 649 destroynotify(XEvent *e)
 650 {
 651         Client *c;
 652         XDestroyWindowEvent *ev = &e->xdestroywindow;
 653
 654         if ((c = wintoclient(ev->window)))
 655                 unmanage(c, 1);
 656 }
 657
 658 void
 659 detach(Client *c)
 660 {
 661         Client **tc;
 662
 663         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 664         *tc = c->next;
 665 }
 666
 667 void
 668 detachstack(Client *c)
 669 {
 670         Client **tc, *t;
 671
 672         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 673         *tc = c->snext;
 674
 675         if (c == c->mon->sel) {
 676                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 677                 c->mon->sel = t;
 678         }
 679 }
 680
 681 Monitor *
 682 dirtomon(int dir)
 683 {
 684         Monitor *m = NULL;
 685
 686         if (dir > 0) {
 687                 if (!(m = selmon->next))
 688                         m = mons;
 689         } else if (selmon == mons)
 690                 for (m = mons; m->next; m = m->next);
 691         else
 692                 for (m = mons; m->next != selmon; m = m->next);
 693         return m;
 694 }
 695
 696 void
 697 drawbar(Monitor *m)
 698 {
 699         int x, w, tw = 0;
 700         int boxs = drw->fonts->h / 9;
 701         int boxw = drw->fonts->h / 6 + 2;
 702         unsigned int i, occ = 0, urg = 0;
 703         Client *c;
 704
 705         if (!m->showbar)
 706                 return;
 707
 708         /* draw status first so it can be overdrawn by tags later */
 709         if (m == selmon) { /* status is only drawn on selected monitor */
 710                 drw_setscheme(drw, scheme[SchemeNorm]);
 711                 tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 712                 drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
 713         }
 714
 715         for (c = m->clients; c; c = c->next) {
 716                 occ |= c->tags;
 717                 if (c->isurgent)
 718                         urg |= c->tags;
 719         }
 720         x = 0;
 721         for (i = 0; i < LENGTH(tags); i++) {
 722                 w = TEXTW(tags[i]);
 723                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 724                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 725                 if (occ & 1 << i)
 726                         drw_rect(drw, x + boxs, boxs, boxw, boxw,
 727                                 m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 728                                 urg & 1 << i);
 729                 x += w;
 730         }
 731         w = blw = TEXTW(m->ltsymbol);
 732         drw_setscheme(drw, scheme[SchemeNorm]);
 733         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 734
 735         if ((w = m->ww - tw - x) > bh) {
 736                 if (m->sel) {
 737                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 738                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 739                         if (m->sel->isfloating)
 740                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 741                 } else {
 742                         drw_setscheme(drw, scheme[SchemeNorm]);
 743                         drw_rect(drw, x, 0, w, bh, 1, 1);
 744                 }
 745         }
 746         drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 747 }
 748
 749 void
 750 drawbars(void)
 751 {
 752         Monitor *m;
 753
 754         for (m = mons; m; m = m->next)
 755                 drawbar(m);
 756 }
 757
 758 void
 759 enternotify(XEvent *e)
 760 {
 761         Client *c;
 762         Monitor *m;
 763         XCrossingEvent *ev = &e->xcrossing;
 764
 765         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 766                 return;
 767         c = wintoclient(ev->window);
 768         m = c ? c->mon : wintomon(ev->window);
 769         if (m != selmon) {
 770                 unfocus(selmon->sel, 1);
 771                 selmon = m;
 772         } else if (!c || c == selmon->sel)
 773                 return;
 774         focus(c);
 775 }
 776
 777 void
 778 expose(XEvent *e)
 779 {
 780         Monitor *m;
 781         XExposeEvent *ev = &e->xexpose;
 782
 783         if (ev->count == 0 && (m = wintomon(ev->window)))
 784                 drawbar(m);
 785 }
 786
 787 void
 788 focus(Client *c)
 789 {
 790         if (!c || !ISVISIBLE(c))
 791                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 792         if (selmon->sel && selmon->sel != c)
 793                 unfocus(selmon->sel, 0);
 794         if (c) {
 795                 if (c->mon != selmon)
 796                         selmon = c->mon;
 797                 if (c->isurgent)
 798                         seturgent(c, 0);
 799                 detachstack(c);
 800                 attachstack(c);
 801                 grabbuttons(c, 1);
 802                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 803                 setfocus(c);
 804         } else {
 805                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 806                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 807         }
 808         selmon->sel = c;
 809         drawbars();
 810 }
 811
 812 /* there are some broken focus acquiring clients needing extra handling */
 813 void
 814 focusin(XEvent *e)
 815 {
 816         XFocusChangeEvent *ev = &e->xfocus;
 817
 818         if (selmon->sel && ev->window != selmon->sel->win)
 819                 setfocus(selmon->sel);
 820 }
 821
 822 void
 823 focusmon(const Arg *arg)
 824 {
 825         Monitor *m;
 826
 827         if (!mons->next)
 828                 return;
 829         if ((m = dirtomon(arg->i)) == selmon)
 830                 return;
 831         unfocus(selmon->sel, 0);
 832         selmon = m;
 833         focus(NULL);
 834 }
 835
 836 void
 837 focusstack(const Arg *arg)
 838 {
 839         Client *c = NULL, *i;
 840
 841         if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen))
 842                 return;
 843         if (arg->i > 0) {
 844                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 845                 if (!c)
 846                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 847         } else {
 848                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 849                         if (ISVISIBLE(i))
 850                                 c = i;
 851                 if (!c)
 852                         for (; i; i = i->next)
 853                                 if (ISVISIBLE(i))
 854                                         c = i;
 855         }
 856         if (c) {
 857                 focus(c);
 858                 restack(selmon);
 859         }
 860 }
 861
 862 Atom
 863 getatomprop(Client *c, Atom prop)
 864 {
 865         int di;
 866         unsigned long dl;
 867         unsigned char *p = NULL;
 868         Atom da, atom = None;
 869
 870         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 871                 &da, &di, &dl, &dl, &p) == Success && p) {
 872                 atom = *(Atom *)p;
 873                 XFree(p);
 874         }
 875         return atom;
 876 }
 877
 878 int
 879 getrootptr(int *x, int *y)
 880 {
 881         int di;
 882         unsigned int dui;
 883         Window dummy;
 884
 885         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 886 }
 887
 888 long
 889 getstate(Window w)
 890 {
 891         int format;
 892         long result = -1;
 893         unsigned char *p = NULL;
 894         unsigned long n, extra;
 895         Atom real;
 896
 897         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 898                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 899                 return -1;
 900         if (n != 0)
 901                 result = *p;
 902         XFree(p);
 903         return result;
 904 }
 905
 906 int
 907 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 908 {
 909         char **list = NULL;
 910         int n;
 911         XTextProperty name;
 912
 913         if (!text || size == 0)
 914                 return 0;
 915         text[0] = '\0';
 916         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
 917                 return 0;
 918         if (name.encoding == XA_STRING)
 919                 strncpy(text, (char *)name.value, size - 1);
 920         else {
 921                 if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 922                         strncpy(text, *list, size - 1);
 923                         XFreeStringList(list);
 924                 }
 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;
 958                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 959                 KeyCode code;
 960
 961                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 962                 for (i = 0; i < LENGTH(keys); i++)
 963                         if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 964                                 for (j = 0; j < LENGTH(modifiers); j++)
 965                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 966                                                 True, GrabModeAsync, GrabModeAsync);
 967         }
 968 }
 969
 970 void
 971 incnmaster(const Arg *arg)
 972 {
 973         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
 974         arrange(selmon);
 975 }
 976
 977 #ifdef XINERAMA
 978 static int
 979 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
 980 {
 981         while (n--)
 982                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
 983                 && unique[n].width == info->width && unique[n].height == info->height)
 984                         return 0;
 985         return 1;
 986 }
 987 #endif /* XINERAMA */
 988
 989 void
 990 keypress(XEvent *e)
 991 {
 992         unsigned int i;
 993         KeySym keysym;
 994         XKeyEvent *ev;
 995
 996         ev = &e->xkey;
 997         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 998         for (i = 0; i < LENGTH(keys); i++)
 999                 if (keysym == keys[i].keysym
1000                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1001                 && keys[i].func)
1002                         keys[i].func(&(keys[i].arg));
1003 }
1004
1005 void
1006 killclient(const Arg *arg)
1007 {
1008         if (!selmon->sel)
1009                 return;
1010         if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1011                 XGrabServer(dpy);
1012                 XSetErrorHandler(xerrordummy);
1013                 XSetCloseDownMode(dpy, DestroyAll);
1014                 XKillClient(dpy, selmon->sel->win);
1015                 XSync(dpy, False);
1016                 XSetErrorHandler(xerror);
1017                 XUngrabServer(dpy);
1018         }
1019 }
1020
1021 void
1022 manage(Window w, XWindowAttributes *wa)
1023 {
1024         Client *c, *t = NULL;
1025         Window trans = None;
1026         XWindowChanges wc;
1027
1028         c = ecalloc(1, sizeof(Client));
1029         c->win = w;
1030         /* geometry */
1031         c->x = c->oldx = wa->x;
1032         c->y = c->oldy = wa->y;
1033         c->w = c->oldw = wa->width;
1034         c->h = c->oldh = wa->height;
1035         c->oldbw = wa->border_width;
1036
1037         updatetitle(c);
1038         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1039                 c->mon = t->mon;
1040                 c->tags = t->tags;
1041         } else {
1042                 c->mon = selmon;
1043                 applyrules(c);
1044         }
1045
1046         if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1047                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1048         if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1049                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1050         c->x = MAX(c->x, c->mon->mx);
1051         /* only fix client y-offset, if the client center might cover the bar */
1052         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1053                 && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1054         c->bw = borderpx;
1055
1056         wc.border_width = c->bw;
1057         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1058         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1059         configure(c); /* propagates border_width, if size doesn't change */
1060         updatewindowtype(c);
1061         updatesizehints(c);
1062         updatewmhints(c);
1063         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1064         grabbuttons(c, 0);
1065         if (!c->isfloating)
1066                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1067         if (c->isfloating)
1068                 XRaiseWindow(dpy, c->win);
1069         attach(c);
1070         attachstack(c);
1071         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1072                 (unsigned char *) &(c->win), 1);
1073         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1074         setclientstate(c, NormalState);
1075         if (c->mon == selmon)
1076                 unfocus(selmon->sel, 0);
1077         c->mon->sel = c;
1078         arrange(c->mon);
1079         XMapWindow(dpy, c->win);
1080         focus(NULL);
1081 }
1082
1083 void
1084 mappingnotify(XEvent *e)
1085 {
1086         XMappingEvent *ev = &e->xmapping;
1087
1088         XRefreshKeyboardMapping(ev);
1089         if (ev->request == MappingKeyboard)
1090                 grabkeys();
1091 }
1092
1093 void
1094 maprequest(XEvent *e)
1095 {
1096         static XWindowAttributes wa;
1097         XMapRequestEvent *ev = &e->xmaprequest;
1098
1099         if (!XGetWindowAttributes(dpy, ev->window, &wa))
1100                 return;
1101         if (wa.override_redirect)
1102                 return;
1103         if (!wintoclient(ev->window))
1104                 manage(ev->window, &wa);
1105 }
1106
1107 void
1108 monocle(Monitor *m)
1109 {
1110         unsigned int n = 0;
1111         Client *c;
1112
1113         for (c = m->clients; c; c = c->next)
1114                 if (ISVISIBLE(c))
1115                         n++;
1116         if (n > 0) /* override layout symbol */
1117                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1118         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1119                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1120 }
1121
1122 void
1123 motionnotify(XEvent *e)
1124 {
1125         static Monitor *mon = NULL;
1126         Monitor *m;
1127         XMotionEvent *ev = &e->xmotion;
1128
1129         if (ev->window != root)
1130                 return;
1131         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1132                 unfocus(selmon->sel, 1);
1133                 selmon = m;
1134                 focus(NULL);
1135         }
1136         mon = m;
1137 }
1138
1139 void
1140 movemouse(const Arg *arg)
1141 {
1142         int x, y, ocx, ocy, nx, ny;
1143         Client *c;
1144         Monitor *m;
1145         XEvent ev;
1146         Time lasttime = 0;
1147
1148         if (!(c = selmon->sel))
1149                 return;
1150         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1151                 return;
1152         restack(selmon);
1153         ocx = c->x;
1154         ocy = c->y;
1155         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1156                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1157                 return;
1158         if (!getrootptr(&x, &y))
1159                 return;
1160         do {
1161                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1162                 switch(ev.type) {
1163                 case ConfigureRequest:
1164                 case Expose:
1165                 case MapRequest:
1166                         handler[ev.type](&ev);
1167                         break;
1168                 case MotionNotify:
1169                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1170                                 continue;
1171                         lasttime = ev.xmotion.time;
1172
1173                         nx = ocx + (ev.xmotion.x - x);
1174                         ny = ocy + (ev.xmotion.y - y);
1175                         if (abs(selmon->wx - nx) < snap)
1176                                 nx = selmon->wx;
1177                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1178                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1179                         if (abs(selmon->wy - ny) < snap)
1180                                 ny = selmon->wy;
1181                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1182                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1183                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1184                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1185                                 togglefloating(NULL);
1186                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1187                                 resize(c, nx, ny, c->w, c->h, 1);
1188                         break;
1189                 }
1190         } while (ev.type != ButtonRelease);
1191         XUngrabPointer(dpy, CurrentTime);
1192         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1193                 sendmon(c, m);
1194                 selmon = m;
1195                 focus(NULL);
1196         }
1197 }
1198
1199 Client *
1200 nexttiled(Client *c)
1201 {
1202         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1203         return c;
1204 }
1205
1206 void
1207 pop(Client *c)
1208 {
1209         detach(c);
1210         attach(c);
1211         focus(c);
1212         arrange(c->mon);
1213 }
1214
1215 void
1216 propertynotify(XEvent *e)
1217 {
1218         Client *c;
1219         Window trans;
1220         XPropertyEvent *ev = &e->xproperty;
1221
1222         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1223                 updatestatus();
1224         else if (ev->state == PropertyDelete)
1225                 return; /* ignore */
1226         else if ((c = wintoclient(ev->window))) {
1227                 switch(ev->atom) {
1228                 default: break;
1229                 case XA_WM_TRANSIENT_FOR:
1230                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1231                                 (c->isfloating = (wintoclient(trans)) != NULL))
1232                                 arrange(c->mon);
1233                         break;
1234                 case XA_WM_NORMAL_HINTS:
1235                         updatesizehints(c);
1236                         break;
1237                 case XA_WM_HINTS:
1238                         updatewmhints(c);
1239                         drawbars();
1240                         break;
1241                 }
1242                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1243                         updatetitle(c);
1244                         if (c == c->mon->sel)
1245                                 drawbar(c->mon);
1246                 }
1247                 if (ev->atom == netatom[NetWMWindowType])
1248                         updatewindowtype(c);
1249         }
1250 }
1251
1252 void
1253 quit(const Arg *arg)
1254 {
1255         running = 0;
1256 }
1257
1258 Monitor *
1259 recttomon(int x, int y, int w, int h)
1260 {
1261         Monitor *m, *r = selmon;
1262         int a, area = 0;
1263
1264         for (m = mons; m; m = m->next)
1265                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1266                         area = a;
1267                         r = m;
1268                 }
1269         return r;
1270 }
1271
1272 void
1273 resize(Client *c, int x, int y, int w, int h, int interact)
1274 {
1275         if (applysizehints(c, &x, &y, &w, &h, interact))
1276                 resizeclient(c, x, y, w, h);
1277 }
1278
1279 void
1280 resizeclient(Client *c, int x, int y, int w, int h)
1281 {
1282         XWindowChanges wc;
1283
1284         c->oldx = c->x; c->x = wc.x = x;
1285         c->oldy = c->y; c->y = wc.y = y;
1286         c->oldw = c->w; c->w = wc.width = w;
1287         c->oldh = c->h; c->h = wc.height = h;
1288         wc.border_width = c->bw;
1289         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1290         configure(c);
1291         XSync(dpy, False);
1292 }
1293
1294 void
1295 resizemouse(const Arg *arg)
1296 {
1297         int ocx, ocy, nw, nh;
1298         Client *c;
1299         Monitor *m;
1300         XEvent ev;
1301         Time lasttime = 0;
1302
1303         if (!(c = selmon->sel))
1304                 return;
1305         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1306                 return;
1307         restack(selmon);
1308         ocx = c->x;
1309         ocy = c->y;
1310         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1311                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1312                 return;
1313         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1314         do {
1315                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1316                 switch(ev.type) {
1317                 case ConfigureRequest:
1318                 case Expose:
1319                 case MapRequest:
1320                         handler[ev.type](&ev);
1321                         break;
1322                 case MotionNotify:
1323                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1324                                 continue;
1325                         lasttime = ev.xmotion.time;
1326
1327                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1328                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1329                         if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1330                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1331                         {
1332                                 if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1333                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1334                                         togglefloating(NULL);
1335                         }
1336                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1337                                 resize(c, c->x, c->y, nw, nh, 1);
1338                         break;
1339                 }
1340         } while (ev.type != ButtonRelease);
1341         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1342         XUngrabPointer(dpy, CurrentTime);
1343         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1344         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1345                 sendmon(c, m);
1346                 selmon = m;
1347                 focus(NULL);
1348         }
1349 }
1350
1351 void
1352 restack(Monitor *m)
1353 {
1354         Client *c;
1355         XEvent ev;
1356         XWindowChanges wc;
1357
1358         drawbar(m);
1359         if (!m->sel)
1360                 return;
1361         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1362                 XRaiseWindow(dpy, m->sel->win);
1363         if (m->lt[m->sellt]->arrange) {
1364                 wc.stack_mode = Below;
1365                 wc.sibling = m->barwin;
1366                 for (c = m->stack; c; c = c->snext)
1367                         if (!c->isfloating && ISVISIBLE(c)) {
1368                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1369                                 wc.sibling = c->win;
1370                         }
1371         }
1372         XSync(dpy, False);
1373         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1374 }
1375
1376 void
1377 run(void)
1378 {
1379         XEvent ev;
1380         /* main event loop */
1381         XSync(dpy, False);
1382         while (running && !XNextEvent(dpy, &ev))
1383                 if (handler[ev.type])
1384                         handler[ev.type](&ev); /* call handler */
1385 }
1386
1387 void
1388 scan(void)
1389 {
1390         unsigned int i, num;
1391         Window d1, d2, *wins = NULL;
1392         XWindowAttributes wa;
1393
1394         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1395                 for (i = 0; i < num; i++) {
1396                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1397                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1398                                 continue;
1399                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1400                                 manage(wins[i], &wa);
1401                 }
1402                 for (i = 0; i < num; i++) { /* now the transients */
1403                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1404                                 continue;
1405                         if (XGetTransientForHint(dpy, wins[i], &d1)
1406                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1407                                 manage(wins[i], &wa);
1408                 }
1409                 if (wins)
1410                         XFree(wins);
1411         }
1412 }
1413
1414 void
1415 sendmon(Client *c, Monitor *m)
1416 {
1417         if (c->mon == m)
1418                 return;
1419         unfocus(c, 1);
1420         detach(c);
1421         detachstack(c);
1422         c->mon = m;
1423         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1424         attach(c);
1425         attachstack(c);
1426         focus(NULL);
1427         arrange(NULL);
1428 }
1429
1430 void
1431 setclientstate(Client *c, long state)
1432 {
1433         long data[] = { state, None };
1434
1435         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1436                 PropModeReplace, (unsigned char *)data, 2);
1437 }
1438
1439 int
1440 sendevent(Client *c, Atom proto)
1441 {
1442         int n;
1443         Atom *protocols;
1444         int exists = 0;
1445         XEvent ev;
1446
1447         if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1448                 while (!exists && n--)
1449                         exists = protocols[n] == proto;
1450                 XFree(protocols);
1451         }
1452         if (exists) {
1453                 ev.type = ClientMessage;
1454                 ev.xclient.window = c->win;
1455                 ev.xclient.message_type = wmatom[WMProtocols];
1456                 ev.xclient.format = 32;
1457                 ev.xclient.data.l[0] = proto;
1458                 ev.xclient.data.l[1] = CurrentTime;
1459                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1460         }
1461         return exists;
1462 }
1463
1464 void
1465 setfocus(Client *c)
1466 {
1467         if (!c->neverfocus) {
1468                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1469                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1470                         XA_WINDOW, 32, PropModeReplace,
1471                         (unsigned char *) &(c->win), 1);
1472         }
1473         sendevent(c, wmatom[WMTakeFocus]);
1474 }
1475
1476 void
1477 setfullscreen(Client *c, int fullscreen)
1478 {
1479         if (fullscreen && !c->isfullscreen) {
1480                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1481                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1482                 c->isfullscreen = 1;
1483                 c->oldstate = c->isfloating;
1484                 c->oldbw = c->bw;
1485                 c->bw = 0;
1486                 c->isfloating = 1;
1487                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1488                 XRaiseWindow(dpy, c->win);
1489         } else if (!fullscreen && c->isfullscreen){
1490                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1491                         PropModeReplace, (unsigned char*)0, 0);
1492                 c->isfullscreen = 0;
1493                 c->isfloating = c->oldstate;
1494                 c->bw = c->oldbw;
1495                 c->x = c->oldx;
1496                 c->y = c->oldy;
1497                 c->w = c->oldw;
1498                 c->h = c->oldh;
1499                 resizeclient(c, c->x, c->y, c->w, c->h);
1500                 arrange(c->mon);
1501         }
1502 }
1503
1504 void
1505 setlayout(const Arg *arg)
1506 {
1507         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1508                 selmon->sellt ^= 1;
1509         if (arg && arg->v)
1510                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1511         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1512         if (selmon->sel)
1513                 arrange(selmon);
1514         else
1515                 drawbar(selmon);
1516 }
1517
1518 /* arg > 1.0 will set mfact absolutely */
1519 void
1520 setmfact(const Arg *arg)
1521 {
1522         float f;
1523
1524         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1525                 return;
1526         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1527         if (f < 0.05 || f > 0.95)
1528                 return;
1529         selmon->mfact = f;
1530         arrange(selmon);
1531 }
1532
1533 void
1534 setup(void)
1535 {
1536         int i;
1537         XSetWindowAttributes wa;
1538         Atom utf8string;
1539
1540         /* clean up any zombies immediately */
1541         sigchld(0);
1542
1543         /* init screen */
1544         screen = DefaultScreen(dpy);
1545         sw = DisplayWidth(dpy, screen);
1546         sh = DisplayHeight(dpy, screen);
1547         root = RootWindow(dpy, screen);
1548         drw = drw_create(dpy, screen, root, sw, sh);
1549         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1550                 die("no fonts could be loaded.");
1551         lrpad = drw->fonts->h;
1552         bh = drw->fonts->h + 2;
1553         updategeom();
1554         /* init atoms */
1555         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1556         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1557         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1558         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1559         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1560         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1561         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1562         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1563         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1564         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1565         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1566         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1567         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1568         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1569         /* init cursors */
1570         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1571         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1572         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1573         /* init appearance */
1574         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1575         for (i = 0; i < LENGTH(colors); i++)
1576                 scheme[i] = drw_scm_create(drw, colors[i], 3);
1577         /* init bars */
1578         updatebars();
1579         updatestatus();
1580         /* supporting window for NetWMCheck */
1581         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1582         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1583                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1584         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1585                 PropModeReplace, (unsigned char *) "dwm", 3);
1586         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1587                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1588         /* EWMH support per view */
1589         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1590                 PropModeReplace, (unsigned char *) netatom, NetLast);
1591         XDeleteProperty(dpy, root, netatom[NetClientList]);
1592         /* select events */
1593         wa.cursor = cursor[CurNormal]->cursor;
1594         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1595                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1596                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1597         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1598         XSelectInput(dpy, root, wa.event_mask);
1599         grabkeys();
1600         focus(NULL);
1601 }
1602
1603
1604 void
1605 seturgent(Client *c, int urg)
1606 {
1607         XWMHints *wmh;
1608
1609         c->isurgent = urg;
1610         if (!(wmh = XGetWMHints(dpy, c->win)))
1611                 return;
1612         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1613         XSetWMHints(dpy, c->win, wmh);
1614         XFree(wmh);
1615 }
1616
1617 void
1618 showhide(Client *c)
1619 {
1620         if (!c)
1621                 return;
1622         if (ISVISIBLE(c)) {
1623                 /* show clients top down */
1624                 XMoveWindow(dpy, c->win, c->x, c->y);
1625                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1626                         resize(c, c->x, c->y, c->w, c->h, 0);
1627                 showhide(c->snext);
1628         } else {
1629                 /* hide clients bottom up */
1630                 showhide(c->snext);
1631                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1632         }
1633 }
1634
1635 void
1636 sigchld(int unused)
1637 {
1638         if (signal(SIGCHLD, sigchld) == SIG_ERR)
1639                 die("can't install SIGCHLD handler:");
1640         while (0 < waitpid(-1, NULL, WNOHANG));
1641 }
1642
1643 void
1644 spawn(const Arg *arg)
1645 {
1646         if (arg->v == dmenucmd)
1647                 dmenumon[0] = '0' + selmon->num;
1648         if (fork() == 0) {
1649                 if (dpy)
1650                         close(ConnectionNumber(dpy));
1651                 setsid();
1652                 execvp(((char **)arg->v)[0], (char **)arg->v);
1653                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1654                 perror(" failed");
1655                 exit(EXIT_SUCCESS);
1656         }
1657 }
1658
1659 void
1660 tag(const Arg *arg)
1661 {
1662         if (selmon->sel && arg->ui & TAGMASK) {
1663                 selmon->sel->tags = arg->ui & TAGMASK;
1664                 focus(NULL);
1665                 arrange(selmon);
1666         }
1667 }
1668
1669 void
1670 tagmon(const Arg *arg)
1671 {
1672         if (!selmon->sel || !mons->next)
1673                 return;
1674         sendmon(selmon->sel, dirtomon(arg->i));
1675 }
1676
1677 void
1678 tile(Monitor *m)
1679 {
1680         unsigned int i, n, h, mw, my, ty;
1681         Client *c;
1682
1683         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1684         if (n == 0)
1685                 return;
1686
1687         if (n > m->nmaster)
1688                 mw = m->nmaster ? m->ww * m->mfact : 0;
1689         else
1690                 mw = m->ww;
1691         for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1692                 if (i < m->nmaster) {
1693                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1694                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1695                         if (my + HEIGHT(c) < m->wh)
1696                                 my += HEIGHT(c);
1697                 } else {
1698                         h = (m->wh - ty) / (n - i);
1699                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1700                         if (ty + HEIGHT(c) < m->wh)
1701                                 ty += HEIGHT(c);
1702                 }
1703 }
1704
1705 void
1706 togglebar(const Arg *arg)
1707 {
1708         selmon->showbar = !selmon->showbar;
1709         updatebarpos(selmon);
1710         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1711         arrange(selmon);
1712 }
1713
1714 void
1715 togglefloating(const Arg *arg)
1716 {
1717         if (!selmon->sel)
1718                 return;
1719         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1720                 return;
1721         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1722         if (selmon->sel->isfloating)
1723                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1724                         selmon->sel->w, selmon->sel->h, 0);
1725         arrange(selmon);
1726 }
1727
1728 void
1729 toggletag(const Arg *arg)
1730 {
1731         unsigned int newtags;
1732
1733         if (!selmon->sel)
1734                 return;
1735         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1736         if (newtags) {
1737                 selmon->sel->tags = newtags;
1738                 focus(NULL);
1739                 arrange(selmon);
1740         }
1741 }
1742
1743 void
1744 toggleview(const Arg *arg)
1745 {
1746         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1747
1748         if (newtagset) {
1749                 selmon->tagset[selmon->seltags] = newtagset;
1750                 focus(NULL);
1751                 arrange(selmon);
1752         }
1753 }
1754
1755 void
1756 unfocus(Client *c, int setfocus)
1757 {
1758         if (!c)
1759                 return;
1760         grabbuttons(c, 0);
1761         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1762         if (setfocus) {
1763                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1764                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1765         }
1766 }
1767
1768 void
1769 unmanage(Client *c, int destroyed)
1770 {
1771         Monitor *m = c->mon;
1772         XWindowChanges wc;
1773
1774         detach(c);
1775         detachstack(c);
1776         if (!destroyed) {
1777                 wc.border_width = c->oldbw;
1778                 XGrabServer(dpy); /* avoid race conditions */
1779                 XSetErrorHandler(xerrordummy);
1780                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1781                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1782                 setclientstate(c, WithdrawnState);
1783                 XSync(dpy, False);
1784                 XSetErrorHandler(xerror);
1785                 XUngrabServer(dpy);
1786         }
1787         free(c);
1788         focus(NULL);
1789         updateclientlist();
1790         arrange(m);
1791 }
1792
1793 void
1794 unmapnotify(XEvent *e)
1795 {
1796         Client *c;
1797         XUnmapEvent *ev = &e->xunmap;
1798
1799         if ((c = wintoclient(ev->window))) {
1800                 if (ev->send_event)
1801                         setclientstate(c, WithdrawnState);
1802                 else
1803                         unmanage(c, 0);
1804         }
1805 }
1806
1807 void
1808 updatebars(void)
1809 {
1810         Monitor *m;
1811         XSetWindowAttributes wa = {
1812                 .override_redirect = True,
1813                 .background_pixmap = ParentRelative,
1814                 .event_mask = ButtonPressMask|ExposureMask
1815         };
1816         XClassHint ch = {"dwm", "dwm"};
1817         for (m = mons; m; m = m->next) {
1818                 if (m->barwin)
1819                         continue;
1820                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1821                                 CopyFromParent, DefaultVisual(dpy, screen),
1822                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1823                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1824                 XMapRaised(dpy, m->barwin);
1825                 XSetClassHint(dpy, m->barwin, &ch);
1826         }
1827 }
1828
1829 void
1830 updatebarpos(Monitor *m)
1831 {
1832         m->wy = m->my;
1833         m->wh = m->mh;
1834         if (m->showbar) {
1835                 m->wh -= bh;
1836                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1837                 m->wy = m->topbar ? m->wy + bh : m->wy;
1838         } else
1839                 m->by = -bh;
1840 }
1841
1842 void
1843 updateclientlist()
1844 {
1845         Client *c;
1846         Monitor *m;
1847
1848         XDeleteProperty(dpy, root, netatom[NetClientList]);
1849         for (m = mons; m; m = m->next)
1850                 for (c = m->clients; c; c = c->next)
1851                         XChangeProperty(dpy, root, netatom[NetClientList],
1852                                 XA_WINDOW, 32, PropModeAppend,
1853                                 (unsigned char *) &(c->win), 1);
1854 }
1855
1856 int
1857 updategeom(void)
1858 {
1859         int dirty = 0;
1860
1861 #ifdef XINERAMA
1862         if (XineramaIsActive(dpy)) {
1863                 int i, j, n, nn;
1864                 Client *c;
1865                 Monitor *m;
1866                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1867                 XineramaScreenInfo *unique = NULL;
1868
1869                 for (n = 0, m = mons; m; m = m->next, n++);
1870                 /* only consider unique geometries as separate screens */
1871                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1872                 for (i = 0, j = 0; i < nn; i++)
1873                         if (isuniquegeom(unique, j, &info[i]))
1874                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1875                 XFree(info);
1876                 nn = j;
1877                 if (n <= nn) { /* new monitors available */
1878                         for (i = 0; i < (nn - n); i++) {
1879                                 for (m = mons; m && m->next; m = m->next);
1880                                 if (m)
1881                                         m->next = createmon();
1882                                 else
1883                                         mons = createmon();
1884                         }
1885                         for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1886                                 if (i >= n
1887                                 || unique[i].x_org != m->mx || unique[i].y_org != m->my
1888                                 || unique[i].width != m->mw || unique[i].height != m->mh)
1889                                 {
1890                                         dirty = 1;
1891                                         m->num = i;
1892                                         m->mx = m->wx = unique[i].x_org;
1893                                         m->my = m->wy = unique[i].y_org;
1894                                         m->mw = m->ww = unique[i].width;
1895                                         m->mh = m->wh = unique[i].height;
1896                                         updatebarpos(m);
1897                                 }
1898                 } else { /* less monitors available nn < n */
1899                         for (i = nn; i < n; i++) {
1900                                 for (m = mons; m && m->next; m = m->next);
1901                                 while ((c = m->clients)) {
1902                                         dirty = 1;
1903                                         m->clients = c->next;
1904                                         detachstack(c);
1905                                         c->mon = mons;
1906                                         attach(c);
1907                                         attachstack(c);
1908                                 }
1909                                 if (m == selmon)
1910                                         selmon = mons;
1911                                 cleanupmon(m);
1912                         }
1913                 }
1914                 free(unique);
1915         } else
1916 #endif /* XINERAMA */
1917         { /* default monitor setup */
1918                 if (!mons)
1919                         mons = createmon();
1920                 if (mons->mw != sw || mons->mh != sh) {
1921                         dirty = 1;
1922                         mons->mw = mons->ww = sw;
1923                         mons->mh = mons->wh = sh;
1924                         updatebarpos(mons);
1925                 }
1926         }
1927         if (dirty) {
1928                 selmon = mons;
1929                 selmon = wintomon(root);
1930         }
1931         return dirty;
1932 }
1933
1934 void
1935 updatenumlockmask(void)
1936 {
1937         unsigned int i, j;
1938         XModifierKeymap *modmap;
1939
1940         numlockmask = 0;
1941         modmap = XGetModifierMapping(dpy);
1942         for (i = 0; i < 8; i++)
1943                 for (j = 0; j < modmap->max_keypermod; j++)
1944                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
1945                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
1946                                 numlockmask = (1 << i);
1947         XFreeModifiermap(modmap);
1948 }
1949
1950 void
1951 updatesizehints(Client *c)
1952 {
1953         long msize;
1954         XSizeHints size;
1955
1956         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
1957                 /* size is uninitialized, ensure that size.flags aren't used */
1958                 size.flags = PSize;
1959         if (size.flags & PBaseSize) {
1960                 c->basew = size.base_width;
1961                 c->baseh = size.base_height;
1962         } else if (size.flags & PMinSize) {
1963                 c->basew = size.min_width;
1964                 c->baseh = size.min_height;
1965         } else
1966                 c->basew = c->baseh = 0;
1967         if (size.flags & PResizeInc) {
1968                 c->incw = size.width_inc;
1969                 c->inch = size.height_inc;
1970         } else
1971                 c->incw = c->inch = 0;
1972         if (size.flags & PMaxSize) {
1973                 c->maxw = size.max_width;
1974                 c->maxh = size.max_height;
1975         } else
1976                 c->maxw = c->maxh = 0;
1977         if (size.flags & PMinSize) {
1978                 c->minw = size.min_width;
1979                 c->minh = size.min_height;
1980         } else if (size.flags & PBaseSize) {
1981                 c->minw = size.base_width;
1982                 c->minh = size.base_height;
1983         } else
1984                 c->minw = c->minh = 0;
1985         if (size.flags & PAspect) {
1986                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1987                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1988         } else
1989                 c->maxa = c->mina = 0.0;
1990         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
1991 }
1992
1993 void
1994 updatestatus(void)
1995 {
1996         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1997                 strcpy(stext, "dwm-"VERSION);
1998         drawbar(selmon);
1999 }
2000
2001 void
2002 updatetitle(Client *c)
2003 {
2004         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2005                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2006         if (c->name[0] == '\0') /* hack to mark broken clients */
2007                 strcpy(c->name, broken);
2008 }
2009
2010 void
2011 updatewindowtype(Client *c)
2012 {
2013         Atom state = getatomprop(c, netatom[NetWMState]);
2014         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2015
2016         if (state == netatom[NetWMFullscreen])
2017                 setfullscreen(c, 1);
2018         if (wtype == netatom[NetWMWindowTypeDialog])
2019                 c->isfloating = 1;
2020 }
2021
2022 void
2023 updatewmhints(Client *c)
2024 {
2025         XWMHints *wmh;
2026
2027         if ((wmh = XGetWMHints(dpy, c->win))) {
2028                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2029                         wmh->flags &= ~XUrgencyHint;
2030                         XSetWMHints(dpy, c->win, wmh);
2031                 } else
2032                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2033                 if (wmh->flags & InputHint)
2034                         c->neverfocus = !wmh->input;
2035                 else
2036                         c->neverfocus = 0;
2037                 XFree(wmh);
2038         }
2039 }
2040
2041 void
2042 view(const Arg *arg)
2043 {
2044         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2045                 return;
2046         selmon->seltags ^= 1; /* toggle sel tagset */
2047         if (arg->ui & TAGMASK)
2048                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2049         focus(NULL);
2050         arrange(selmon);
2051 }
2052
2053 Client *
2054 wintoclient(Window w)
2055 {
2056         Client *c;
2057         Monitor *m;
2058
2059         for (m = mons; m; m = m->next)
2060                 for (c = m->clients; c; c = c->next)
2061                         if (c->win == w)
2062                                 return c;
2063         return NULL;
2064 }
2065
2066 Monitor *
2067 wintomon(Window w)
2068 {
2069         int x, y;
2070         Client *c;
2071         Monitor *m;
2072
2073         if (w == root && getrootptr(&x, &y))
2074                 return recttomon(x, y, 1, 1);
2075         for (m = mons; m; m = m->next)
2076                 if (w == m->barwin)
2077                         return m;
2078         if ((c = wintoclient(w)))
2079                 return c->mon;
2080         return selmon;
2081 }
2082
2083 /* There's no way to check accesses to destroyed windows, thus those cases are
2084  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2085  * default error handler, which may call exit. */
2086 int
2087 xerror(Display *dpy, XErrorEvent *ee)
2088 {
2089         if (ee->error_code == BadWindow
2090         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2091         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2092         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2093         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2094         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2095         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2096         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2097         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2098                 return 0;
2099         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2100                 ee->request_code, ee->error_code);
2101         return xerrorxlib(dpy, ee); /* may call exit */
2102 }
2103
2104 int
2105 xerrordummy(Display *dpy, XErrorEvent *ee)
2106 {
2107         return 0;
2108 }
2109
2110 /* Startup Error handler to check if another window manager
2111  * is already running. */
2112 int
2113 xerrorstart(Display *dpy, XErrorEvent *ee)
2114 {
2115         die("dwm: another window manager is already running");
2116         return -1;
2117 }
2118
2119 void
2120 zoom(const Arg *arg)
2121 {
2122         Client *c = selmon->sel;
2123
2124         if (!selmon->lt[selmon->sellt]->arrange
2125         || (selmon->sel && selmon->sel->isfloating))
2126                 return;
2127         if (c == nexttiled(selmon->clients))
2128                 if (!c || !(c = nexttiled(c->next)))
2129                         return;
2130         pop(c);
2131 }
2132
2133 int
2134 main(int argc, char *argv[])
2135 {
2136         if (argc == 2 && !strcmp("-v", argv[1]))
2137                 die("dwm-"VERSION);
2138         else if (argc != 1)
2139                 die("usage: dwm [-v]");
2140         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2141                 fputs("warning: no locale support\n", stderr);
2142         if (!(dpy = XOpenDisplay(NULL)))
2143                 die("dwm: cannot open display");
2144         checkotherwm();
2145         setup();
2146 #ifdef __OpenBSD__
2147         if (pledge("stdio rpath proc exec", NULL) == -1)
2148                 die("pledge");
2149 #endif /* __OpenBSD__ */
2150         scan();
2151         run();
2152         cleanup();
2153         XCloseDisplay(dpy);
2154         return EXIT_SUCCESS;
2155 }