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 #include <X11/Xlib-xcb.h>
  44 #include <xcb/res.h>
  45 #ifdef __OpenBSD__
  46 #include <sys/sysctl.h>
  47 #include <kvm.h>
  48 #endif /* __OpenBSD */
  49
  50 #include "drw.h"
  51 #include "util.h"
  52
  53 /* macros */
  54 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  55 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  56 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  57                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  58 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  59 #define LENGTH(X)               (sizeof X / sizeof X[0])
  60 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  61 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  62 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  63 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  64 #define TEXTW(X)                (drw_fontset_getwidth(drw, (X)) + lrpad)
  65
  66 /* enums */
  67 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  68 enum { SchemeNorm, SchemeSel }; /* color schemes */
  69 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  70        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  71        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  72 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  73 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  74        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  75
  76 typedef union {
  77         int i;
  78         unsigned int ui;
  79         float f;
  80         const void *v;
  81 } Arg;
  82
  83 typedef struct {
  84         unsigned int click;
  85         unsigned int mask;
  86         unsigned int button;
  87         void (*func)(const Arg *arg);
  88         const Arg arg;
  89 } Button;
  90
  91 typedef struct Monitor Monitor;
  92 typedef struct Client Client;
  93 struct Client {
  94         char name[256];
  95         float mina, maxa;
  96         int x, y, w, h;
  97         int oldx, oldy, oldw, oldh;
  98         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  99         int bw, oldbw;
 100         unsigned int tags;
 101         int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
 102         pid_t pid;
 103         Client *next;
 104         Client *snext;
 105         Client *swallowing;
 106         Monitor *mon;
 107         Window win;
 108 };
 109
 110 typedef struct {
 111         unsigned int mod;
 112         KeySym keysym;
 113         void (*func)(const Arg *);
 114         const Arg arg;
 115 } Key;
 116
 117 typedef struct {
 118         const char *symbol;
 119         void (*arrange)(Monitor *);
 120 } Layout;
 121
 122 struct Monitor {
 123         char ltsymbol[16];
 124         float mfact;
 125         int nmaster;
 126         int num;
 127         int by;               /* bar geometry */
 128         int mx, my, mw, mh;   /* screen size */
 129         int wx, wy, ww, wh;   /* window area  */
 130         unsigned int seltags;
 131         unsigned int sellt;
 132         unsigned int tagset[2];
 133         int showbar;
 134         int topbar;
 135         Client *clients;
 136         Client *sel;
 137         Client *stack;
 138         Monitor *next;
 139         Window barwin;
 140         const Layout *lt[2];
 141 };
 142
 143 typedef struct {
 144         const char *class;
 145         const char *instance;
 146         const char *title;
 147         unsigned int tags;
 148         int isfloating;
 149         int isterminal;
 150         int noswallow;
 151         int monitor;
 152 } Rule;
 153
 154 /* function declarations */
 155 static void applyrules(Client *c);
 156 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 157 static void arrange(Monitor *m);
 158 static void arrangemon(Monitor *m);
 159 static void attach(Client *c);
 160 static void attachstack(Client *c);
 161 static void buttonpress(XEvent *e);
 162 static void checkotherwm(void);
 163 static void cleanup(void);
 164 static void cleanupmon(Monitor *mon);
 165 static void clientmessage(XEvent *e);
 166 static void configure(Client *c);
 167 static void configurenotify(XEvent *e);
 168 static void configurerequest(XEvent *e);
 169 static Monitor *createmon(void);
 170 static void destroynotify(XEvent *e);
 171 static void detach(Client *c);
 172 static void detachstack(Client *c);
 173 static Monitor *dirtomon(int dir);
 174 static void drawbar(Monitor *m);
 175 static void drawbars(void);
 176 static void enternotify(XEvent *e);
 177 static void expose(XEvent *e);
 178 static void focus(Client *c);
 179 static void focusin(XEvent *e);
 180 static void focusmon(const Arg *arg);
 181 static void focusstack(const Arg *arg);
 182 static Atom getatomprop(Client *c, Atom prop);
 183 static int getrootptr(int *x, int *y);
 184 static long getstate(Window w);
 185 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 186 static void grabbuttons(Client *c, int focused);
 187 static void grabkeys(void);
 188 static void incnmaster(const Arg *arg);
 189 static void keypress(XEvent *e);
 190 static void killclient(const Arg *arg);
 191 static void manage(Window w, XWindowAttributes *wa);
 192 static void mappingnotify(XEvent *e);
 193 static void maprequest(XEvent *e);
 194 static void monocle(Monitor *m);
 195 static void motionnotify(XEvent *e);
 196 static void movemouse(const Arg *arg);
 197 static Client *nexttiled(Client *c);
 198 static void pop(Client *);
 199 static void propertynotify(XEvent *e);
 200 static void quit(const Arg *arg);
 201 static Monitor *recttomon(int x, int y, int w, int h);
 202 static void resize(Client *c, int x, int y, int w, int h, int interact);
 203 static void resizeclient(Client *c, int x, int y, int w, int h);
 204 static void resizemouse(const Arg *arg);
 205 static void restack(Monitor *m);
 206 static void run(void);
 207 static void scan(void);
 208 static int sendevent(Client *c, Atom proto);
 209 static void sendmon(Client *c, Monitor *m);
 210 static void setclientstate(Client *c, long state);
 211 static void setfocus(Client *c);
 212 static void setfullscreen(Client *c, int fullscreen);
 213 static void setlayout(const Arg *arg);
 214 static void setmfact(const Arg *arg);
 215 static void setup(void);
 216 static void seturgent(Client *c, int urg);
 217 static void showhide(Client *c);
 218 static void sigchld(int unused);
 219 static void spawn(const Arg *arg);
 220 static void tag(const Arg *arg);
 221 static void tagmon(const Arg *arg);
 222 static void tile(Monitor *);
 223 static void togglebar(const Arg *arg);
 224 static void togglefloating(const Arg *arg);
 225 static void toggletag(const Arg *arg);
 226 static void toggleview(const Arg *arg);
 227 static void unfocus(Client *c, int setfocus);
 228 static void unmanage(Client *c, int destroyed);
 229 static void unmapnotify(XEvent *e);
 230 static void updatebarpos(Monitor *m);
 231 static void updatebars(void);
 232 static void updateclientlist(void);
 233 static int updategeom(void);
 234 static void updatenumlockmask(void);
 235 static void updatesizehints(Client *c);
 236 static void updatestatus(void);
 237 static void updatetitle(Client *c);
 238 static void updatewindowtype(Client *c);
 239 static void updatewmhints(Client *c);
 240 static void view(const Arg *arg);
 241 static Client *wintoclient(Window w);
 242 static Monitor *wintomon(Window w);
 243 static int xerror(Display *dpy, XErrorEvent *ee);
 244 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 245 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 246 static void zoom(const Arg *arg);
 247
 248 static pid_t getparentprocess(pid_t p);
 249 static int isdescprocess(pid_t p, pid_t c);
 250 static Client *swallowingclient(Window w);
 251 static Client *termforwin(const Client *c);
 252 static pid_t winpid(Window w);
 253
 254 /* variables */
 255 static const char broken[] = "broken";
 256 static char stext[256];
 257 static int screen;
 258 static int sw, sh;           /* X display screen geometry width, height */
 259 static int bh, blw = 0;      /* bar geometry */
 260 static int lrpad;            /* sum of left and right padding for text */
 261 static int (*xerrorxlib)(Display *, XErrorEvent *);
 262 static unsigned int numlockmask = 0;
 263 static void (*handler[LASTEvent]) (XEvent *) = {
 264         [ButtonPress] = buttonpress,
 265         [ClientMessage] = clientmessage,
 266         [ConfigureRequest] = configurerequest,
 267         [ConfigureNotify] = configurenotify,
 268         [DestroyNotify] = destroynotify,
 269         [EnterNotify] = enternotify,
 270         [Expose] = expose,
 271         [FocusIn] = focusin,
 272         [KeyPress] = keypress,
 273         [MappingNotify] = mappingnotify,
 274         [MapRequest] = maprequest,
 275         [MotionNotify] = motionnotify,
 276         [PropertyNotify] = propertynotify,
 277         [UnmapNotify] = unmapnotify
 278 };
 279 static Atom wmatom[WMLast], netatom[NetLast];
 280 static int running = 1;
 281 static Cur *cursor[CurLast];
 282 static Clr **scheme;
 283 static Display *dpy;
 284 static Drw *drw;
 285 static Monitor *mons, *selmon;
 286 static Window root, wmcheckwin;
 287
 288 static xcb_connection_t *xcon;
 289
 290 /* configuration, allows nested code to access above variables */
 291 #include "config.h"
 292
 293 /* compile-time check if all tags fit into an unsigned int bit array. */
 294 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 295
 296 /* function implementations */
 297 void
 298 applyrules(Client *c)
 299 {
 300         const char *class, *instance;
 301         unsigned int i;
 302         const Rule *r;
 303         Monitor *m;
 304         XClassHint ch = { NULL, NULL };
 305
 306         /* rule matching */
 307         c->isfloating = 0;
 308         c->tags = 0;
 309         XGetClassHint(dpy, c->win, &ch);
 310         class    = ch.res_class ? ch.res_class : broken;
 311         instance = ch.res_name  ? ch.res_name  : broken;
 312
 313         for (i = 0; i < LENGTH(rules); i++) {
 314                 r = &rules[i];
 315                 if ((!r->title || strstr(c->name, r->title))
 316                 && (!r->class || strstr(class, r->class))
 317                 && (!r->instance || strstr(instance, r->instance)))
 318                 {
 319                         c->isterminal = r->isterminal;
 320                         c->noswallow  = r->noswallow;
 321                         c->isfloating = r->isfloating;
 322                         c->tags |= r->tags;
 323                         for (m = mons; m && m->num != r->monitor; m = m->next);
 324                         if (m)
 325                                 c->mon = m;
 326                 }
 327         }
 328         if (ch.res_class)
 329                 XFree(ch.res_class);
 330         if (ch.res_name)
 331                 XFree(ch.res_name);
 332         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 333 }
 334
 335 int
 336 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 337 {
 338         int baseismin;
 339         Monitor *m = c->mon;
 340
 341         /* set minimum possible */
 342         *w = MAX(1, *w);
 343         *h = MAX(1, *h);
 344         if (interact) {
 345                 if (*x > sw)
 346                         *x = sw - WIDTH(c);
 347                 if (*y > sh)
 348                         *y = sh - HEIGHT(c);
 349                 if (*x + *w + 2 * c->bw < 0)
 350                         *x = 0;
 351                 if (*y + *h + 2 * c->bw < 0)
 352                         *y = 0;
 353         } else {
 354                 if (*x >= m->wx + m->ww)
 355                         *x = m->wx + m->ww - WIDTH(c);
 356                 if (*y >= m->wy + m->wh)
 357                         *y = m->wy + m->wh - HEIGHT(c);
 358                 if (*x + *w + 2 * c->bw <= m->wx)
 359                         *x = m->wx;
 360                 if (*y + *h + 2 * c->bw <= m->wy)
 361                         *y = m->wy;
 362         }
 363         if (*h < bh)
 364                 *h = bh;
 365         if (*w < bh)
 366                 *w = bh;
 367         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 368                 /* see last two sentences in ICCCM 4.1.2.3 */
 369                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 370                 if (!baseismin) { /* temporarily remove base dimensions */
 371                         *w -= c->basew;
 372                         *h -= c->baseh;
 373                 }
 374                 /* adjust for aspect limits */
 375                 if (c->mina > 0 && c->maxa > 0) {
 376                         if (c->maxa < (float)*w / *h)
 377                                 *w = *h * c->maxa + 0.5;
 378                         else if (c->mina < (float)*h / *w)
 379                                 *h = *w * c->mina + 0.5;
 380                 }
 381                 if (baseismin) { /* increment calculation requires this */
 382                         *w -= c->basew;
 383                         *h -= c->baseh;
 384                 }
 385                 /* adjust for increment value */
 386                 if (c->incw)
 387                         *w -= *w % c->incw;
 388                 if (c->inch)
 389                         *h -= *h % c->inch;
 390                 /* restore base dimensions */
 391                 *w = MAX(*w + c->basew, c->minw);
 392                 *h = MAX(*h + c->baseh, c->minh);
 393                 if (c->maxw)
 394                         *w = MIN(*w, c->maxw);
 395                 if (c->maxh)
 396                         *h = MIN(*h, c->maxh);
 397         }
 398         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 399 }
 400
 401 void
 402 arrange(Monitor *m)
 403 {
 404         if (m)
 405                 showhide(m->stack);
 406         else for (m = mons; m; m = m->next)
 407                 showhide(m->stack);
 408         if (m) {
 409                 arrangemon(m);
 410                 restack(m);
 411         } else for (m = mons; m; m = m->next)
 412                 arrangemon(m);
 413 }
 414
 415 void
 416 arrangemon(Monitor *m)
 417 {
 418         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 419         if (m->lt[m->sellt]->arrange)
 420                 m->lt[m->sellt]->arrange(m);
 421 }
 422
 423 void
 424 attach(Client *c)
 425 {
 426         c->next = c->mon->clients;
 427         c->mon->clients = c;
 428 }
 429
 430 void
 431 attachstack(Client *c)
 432 {
 433         c->snext = c->mon->stack;
 434         c->mon->stack = c;
 435 }
 436
 437 void
 438 swallow(Client *p, Client *c)
 439 {
 440
 441         if (c->noswallow || c->isterminal)
 442                 return;
 443         if (c->noswallow && !swallowfloating && c->isfloating)
 444                 return;
 445
 446         detach(c);
 447         detachstack(c);
 448
 449         setclientstate(c, WithdrawnState);
 450         XUnmapWindow(dpy, p->win);
 451
 452         p->swallowing = c;
 453         c->mon = p->mon;
 454
 455         Window w = p->win;
 456         p->win = c->win;
 457         c->win = w;
 458         updatetitle(p);
 459         XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
 460         arrange(p->mon);
 461         configure(p);
 462         updateclientlist();
 463 }
 464
 465 void
 466 unswallow(Client *c)
 467 {
 468         c->win = c->swallowing->win;
 469
 470         free(c->swallowing);
 471         c->swallowing = NULL;
 472
 473         /* unfullscreen the client */
 474         setfullscreen(c, 0);
 475         updatetitle(c);
 476         arrange(c->mon);
 477         XMapWindow(dpy, c->win);
 478         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 479         setclientstate(c, NormalState);
 480         focus(NULL);
 481         arrange(c->mon);
 482 }
 483
 484 void
 485 buttonpress(XEvent *e)
 486 {
 487         unsigned int i, x, click;
 488         Arg arg = {0};
 489         Client *c;
 490         Monitor *m;
 491         XButtonPressedEvent *ev = &e->xbutton;
 492
 493         click = ClkRootWin;
 494         /* focus monitor if necessary */
 495         if ((m = wintomon(ev->window)) && m != selmon) {
 496                 unfocus(selmon->sel, 1);
 497                 selmon = m;
 498                 focus(NULL);
 499         }
 500         if (ev->window == selmon->barwin) {
 501                 i = x = 0;
 502                 do
 503                         x += TEXTW(tags[i]);
 504                 while (ev->x >= x && ++i < LENGTH(tags));
 505                 if (i < LENGTH(tags)) {
 506                         click = ClkTagBar;
 507                         arg.ui = 1 << i;
 508                 } else if (ev->x < x + blw)
 509                         click = ClkLtSymbol;
 510                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 511                         click = ClkStatusText;
 512                 else
 513                         click = ClkWinTitle;
 514         } else if ((c = wintoclient(ev->window))) {
 515                 focus(c);
 516                 restack(selmon);
 517                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 518                 click = ClkClientWin;
 519         }
 520         for (i = 0; i < LENGTH(buttons); i++)
 521                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 522                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 523                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 524 }
 525
 526 void
 527 checkotherwm(void)
 528 {
 529         xerrorxlib = XSetErrorHandler(xerrorstart);
 530         /* this causes an error if some other window manager is running */
 531         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 532         XSync(dpy, False);
 533         XSetErrorHandler(xerror);
 534         XSync(dpy, False);
 535 }
 536
 537 void
 538 cleanup(void)
 539 {
 540         Arg a = {.ui = ~0};
 541         Layout foo = { "", NULL };
 542         Monitor *m;
 543         size_t i;
 544
 545         view(&a);
 546         selmon->lt[selmon->sellt] = &foo;
 547         for (m = mons; m; m = m->next)
 548                 while (m->stack)
 549                         unmanage(m->stack, 0);
 550         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 551         while (mons)
 552                 cleanupmon(mons);
 553         for (i = 0; i < CurLast; i++)
 554                 drw_cur_free(drw, cursor[i]);
 555         for (i = 0; i < LENGTH(colors); i++)
 556                 free(scheme[i]);
 557         free(scheme);
 558         XDestroyWindow(dpy, wmcheckwin);
 559         drw_free(drw);
 560         XSync(dpy, False);
 561         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 562         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 563 }
 564
 565 void
 566 cleanupmon(Monitor *mon)
 567 {
 568         Monitor *m;
 569
 570         if (mon == mons)
 571                 mons = mons->next;
 572         else {
 573                 for (m = mons; m && m->next != mon; m = m->next);
 574                 m->next = mon->next;
 575         }
 576         XUnmapWindow(dpy, mon->barwin);
 577         XDestroyWindow(dpy, mon->barwin);
 578         free(mon);
 579 }
 580
 581 void
 582 clientmessage(XEvent *e)
 583 {
 584         XClientMessageEvent *cme = &e->xclient;
 585         Client *c = wintoclient(cme->window);
 586
 587         if (!c)
 588                 return;
 589         if (cme->message_type == netatom[NetWMState]) {
 590                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 591                 || cme->data.l[2] == netatom[NetWMFullscreen])
 592                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 593                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 594         } else if (cme->message_type == netatom[NetActiveWindow]) {
 595                 if (c != selmon->sel && !c->isurgent)
 596                         seturgent(c, 1);
 597         }
 598 }
 599
 600 void
 601 configure(Client *c)
 602 {
 603         XConfigureEvent ce;
 604
 605         ce.type = ConfigureNotify;
 606         ce.display = dpy;
 607         ce.event = c->win;
 608         ce.window = c->win;
 609         ce.x = c->x;
 610         ce.y = c->y;
 611         ce.width = c->w;
 612         ce.height = c->h;
 613         ce.border_width = c->bw;
 614         ce.above = None;
 615         ce.override_redirect = False;
 616         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 617 }
 618
 619 void
 620 configurenotify(XEvent *e)
 621 {
 622         Monitor *m;
 623         Client *c;
 624         XConfigureEvent *ev = &e->xconfigure;
 625         int dirty;
 626
 627         /* TODO: updategeom handling sucks, needs to be simplified */
 628         if (ev->window == root) {
 629                 dirty = (sw != ev->width || sh != ev->height);
 630                 sw = ev->width;
 631                 sh = ev->height;
 632                 if (updategeom() || dirty) {
 633                         drw_resize(drw, sw, bh);
 634                         updatebars();
 635                         for (m = mons; m; m = m->next) {
 636                                 for (c = m->clients; c; c = c->next)
 637                                         if (c->isfullscreen)
 638                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 639                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 640                         }
 641                         focus(NULL);
 642                         arrange(NULL);
 643                 }
 644         }
 645 }
 646
 647 void
 648 configurerequest(XEvent *e)
 649 {
 650         Client *c;
 651         Monitor *m;
 652         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 653         XWindowChanges wc;
 654
 655         if ((c = wintoclient(ev->window))) {
 656                 if (ev->value_mask & CWBorderWidth)
 657                         c->bw = ev->border_width;
 658                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 659                         m = c->mon;
 660                         if (ev->value_mask & CWX) {
 661                                 c->oldx = c->x;
 662                                 c->x = m->mx + ev->x;
 663                         }
 664                         if (ev->value_mask & CWY) {
 665                                 c->oldy = c->y;
 666                                 c->y = m->my + ev->y;
 667                         }
 668                         if (ev->value_mask & CWWidth) {
 669                                 c->oldw = c->w;
 670                                 c->w = ev->width;
 671                         }
 672                         if (ev->value_mask & CWHeight) {
 673                                 c->oldh = c->h;
 674                                 c->h = ev->height;
 675                         }
 676                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 677                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 678                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 679                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 680                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 681                                 configure(c);
 682                         if (ISVISIBLE(c))
 683                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 684                 } else
 685                         configure(c);
 686         } else {
 687                 wc.x = ev->x;
 688                 wc.y = ev->y;
 689                 wc.width = ev->width;
 690                 wc.height = ev->height;
 691                 wc.border_width = ev->border_width;
 692                 wc.sibling = ev->above;
 693                 wc.stack_mode = ev->detail;
 694                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 695         }
 696         XSync(dpy, False);
 697 }
 698
 699 Monitor *
 700 createmon(void)
 701 {
 702         Monitor *m;
 703
 704         m = ecalloc(1, sizeof(Monitor));
 705         m->tagset[0] = m->tagset[1] = 1;
 706         m->mfact = mfact;
 707         m->nmaster = nmaster;
 708         m->showbar = showbar;
 709         m->topbar = topbar;
 710         m->lt[0] = &layouts[0];
 711         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 712         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 713         return m;
 714 }
 715
 716 void
 717 destroynotify(XEvent *e)
 718 {
 719         Client *c;
 720         XDestroyWindowEvent *ev = &e->xdestroywindow;
 721
 722         if ((c = wintoclient(ev->window)))
 723                 unmanage(c, 1);
 724
 725         else if ((c = swallowingclient(ev->window)))
 726                 unmanage(c->swallowing, 1);
 727 }
 728
 729 void
 730 detach(Client *c)
 731 {
 732         Client **tc;
 733
 734         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 735         *tc = c->next;
 736 }
 737
 738 void
 739 detachstack(Client *c)
 740 {
 741         Client **tc, *t;
 742
 743         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 744         *tc = c->snext;
 745
 746         if (c == c->mon->sel) {
 747                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 748                 c->mon->sel = t;
 749         }
 750 }
 751
 752 Monitor *
 753 dirtomon(int dir)
 754 {
 755         Monitor *m = NULL;
 756
 757         if (dir > 0) {
 758                 if (!(m = selmon->next))
 759                         m = mons;
 760         } else if (selmon == mons)
 761                 for (m = mons; m->next; m = m->next);
 762         else
 763                 for (m = mons; m->next != selmon; m = m->next);
 764         return m;
 765 }
 766
 767 void
 768 drawbar(Monitor *m)
 769 {
 770         int x, w, tw = 0;
 771         int boxs = drw->fonts->h / 9;
 772         int boxw = drw->fonts->h / 6 + 2;
 773         unsigned int i, occ = 0, urg = 0;
 774         Client *c;
 775
 776         if (!m->showbar)
 777                 return;
 778
 779         /* draw status first so it can be overdrawn by tags later */
 780         if (m == selmon) { /* status is only drawn on selected monitor */
 781                 drw_setscheme(drw, scheme[SchemeNorm]);
 782                 tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 783                 drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
 784         }
 785
 786         for (c = m->clients; c; c = c->next) {
 787                 occ |= c->tags;
 788                 if (c->isurgent)
 789                         urg |= c->tags;
 790         }
 791         x = 0;
 792         for (i = 0; i < LENGTH(tags); i++) {
 793                 w = TEXTW(tags[i]);
 794                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 795                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 796                 if (occ & 1 << i)
 797                         drw_rect(drw, x + boxs, boxs, boxw, boxw,
 798                                 m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 799                                 urg & 1 << i);
 800                 x += w;
 801         }
 802         w = blw = TEXTW(m->ltsymbol);
 803         drw_setscheme(drw, scheme[SchemeNorm]);
 804         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 805
 806         if ((w = m->ww - tw - x) > bh) {
 807                 if (m->sel) {
 808                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 809                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 810                         if (m->sel->isfloating)
 811                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 812                 } else {
 813                         drw_setscheme(drw, scheme[SchemeNorm]);
 814                         drw_rect(drw, x, 0, w, bh, 1, 1);
 815                 }
 816         }
 817         drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 818 }
 819
 820 void
 821 drawbars(void)
 822 {
 823         Monitor *m;
 824
 825         for (m = mons; m; m = m->next)
 826                 drawbar(m);
 827 }
 828
 829 void
 830 enternotify(XEvent *e)
 831 {
 832         Client *c;
 833         Monitor *m;
 834         XCrossingEvent *ev = &e->xcrossing;
 835
 836         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 837                 return;
 838         c = wintoclient(ev->window);
 839         m = c ? c->mon : wintomon(ev->window);
 840         if (m != selmon) {
 841                 unfocus(selmon->sel, 1);
 842                 selmon = m;
 843         } else if (!c || c == selmon->sel)
 844                 return;
 845         focus(c);
 846 }
 847
 848 void
 849 expose(XEvent *e)
 850 {
 851         Monitor *m;
 852         XExposeEvent *ev = &e->xexpose;
 853
 854         if (ev->count == 0 && (m = wintomon(ev->window)))
 855                 drawbar(m);
 856 }
 857
 858 void
 859 focus(Client *c)
 860 {
 861         if (!c || !ISVISIBLE(c))
 862                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 863         if (selmon->sel && selmon->sel != c)
 864                 unfocus(selmon->sel, 0);
 865         if (c) {
 866                 if (c->mon != selmon)
 867                         selmon = c->mon;
 868                 if (c->isurgent)
 869                         seturgent(c, 0);
 870                 detachstack(c);
 871                 attachstack(c);
 872                 grabbuttons(c, 1);
 873                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 874                 setfocus(c);
 875         } else {
 876                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 877                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 878         }
 879         selmon->sel = c;
 880         drawbars();
 881 }
 882
 883 /* there are some broken focus acquiring clients needing extra handling */
 884 void
 885 focusin(XEvent *e)
 886 {
 887         XFocusChangeEvent *ev = &e->xfocus;
 888
 889         if (selmon->sel && ev->window != selmon->sel->win)
 890                 setfocus(selmon->sel);
 891 }
 892
 893 void
 894 focusmon(const Arg *arg)
 895 {
 896         Monitor *m;
 897
 898         if (!mons->next)
 899                 return;
 900         if ((m = dirtomon(arg->i)) == selmon)
 901                 return;
 902         unfocus(selmon->sel, 0);
 903         selmon = m;
 904         focus(NULL);
 905 }
 906
 907 void
 908 focusstack(const Arg *arg)
 909 {
 910         Client *c = NULL, *i;
 911
 912         if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen))
 913                 return;
 914         if (arg->i > 0) {
 915                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 916                 if (!c)
 917                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 918         } else {
 919                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 920                         if (ISVISIBLE(i))
 921                                 c = i;
 922                 if (!c)
 923                         for (; i; i = i->next)
 924                                 if (ISVISIBLE(i))
 925                                         c = i;
 926         }
 927         if (c) {
 928                 focus(c);
 929                 restack(selmon);
 930         }
 931 }
 932
 933 Atom
 934 getatomprop(Client *c, Atom prop)
 935 {
 936         int di;
 937         unsigned long dl;
 938         unsigned char *p = NULL;
 939         Atom da, atom = None;
 940
 941         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 942                 &da, &di, &dl, &dl, &p) == Success && p) {
 943                 atom = *(Atom *)p;
 944                 XFree(p);
 945         }
 946         return atom;
 947 }
 948
 949 int
 950 getrootptr(int *x, int *y)
 951 {
 952         int di;
 953         unsigned int dui;
 954         Window dummy;
 955
 956         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 957 }
 958
 959 long
 960 getstate(Window w)
 961 {
 962         int format;
 963         long result = -1;
 964         unsigned char *p = NULL;
 965         unsigned long n, extra;
 966         Atom real;
 967
 968         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 969                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 970                 return -1;
 971         if (n != 0)
 972                 result = *p;
 973         XFree(p);
 974         return result;
 975 }
 976
 977 int
 978 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 979 {
 980         char **list = NULL;
 981         int n;
 982         XTextProperty name;
 983
 984         if (!text || size == 0)
 985                 return 0;
 986         text[0] = '\0';
 987         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
 988                 return 0;
 989         if (name.encoding == XA_STRING)
 990                 strncpy(text, (char *)name.value, size - 1);
 991         else {
 992                 if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 993                         strncpy(text, *list, size - 1);
 994                         XFreeStringList(list);
 995                 }
 996         }
 997         text[size - 1] = '\0';
 998         XFree(name.value);
 999         return 1;
1000 }
1001
1002 void
1003 grabbuttons(Client *c, int focused)
1004 {
1005         updatenumlockmask();
1006         {
1007                 unsigned int i, j;
1008                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1009                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1010                 if (!focused)
1011                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1012                                 BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
1013                 for (i = 0; i < LENGTH(buttons); i++)
1014                         if (buttons[i].click == ClkClientWin)
1015                                 for (j = 0; j < LENGTH(modifiers); j++)
1016                                         XGrabButton(dpy, buttons[i].button,
1017                                                 buttons[i].mask | modifiers[j],
1018                                                 c->win, False, BUTTONMASK,
1019                                                 GrabModeAsync, GrabModeSync, None, None);
1020         }
1021 }
1022
1023 void
1024 grabkeys(void)
1025 {
1026         updatenumlockmask();
1027         {
1028                 unsigned int i, j;
1029                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1030                 KeyCode code;
1031
1032                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1033                 for (i = 0; i < LENGTH(keys); i++)
1034                         if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1035                                 for (j = 0; j < LENGTH(modifiers); j++)
1036                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1037                                                 True, GrabModeAsync, GrabModeAsync);
1038         }
1039 }
1040
1041 void
1042 incnmaster(const Arg *arg)
1043 {
1044         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1045         arrange(selmon);
1046 }
1047
1048 #ifdef XINERAMA
1049 static int
1050 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
1051 {
1052         while (n--)
1053                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1054                 && unique[n].width == info->width && unique[n].height == info->height)
1055                         return 0;
1056         return 1;
1057 }
1058 #endif /* XINERAMA */
1059
1060 void
1061 keypress(XEvent *e)
1062 {
1063         unsigned int i;
1064         KeySym keysym;
1065         XKeyEvent *ev;
1066
1067         ev = &e->xkey;
1068         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1069         for (i = 0; i < LENGTH(keys); i++)
1070                 if (keysym == keys[i].keysym
1071                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1072                 && keys[i].func)
1073                         keys[i].func(&(keys[i].arg));
1074 }
1075
1076 void
1077 killclient(const Arg *arg)
1078 {
1079         if (!selmon->sel)
1080                 return;
1081         if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1082                 XGrabServer(dpy);
1083                 XSetErrorHandler(xerrordummy);
1084                 XSetCloseDownMode(dpy, DestroyAll);
1085                 XKillClient(dpy, selmon->sel->win);
1086                 XSync(dpy, False);
1087                 XSetErrorHandler(xerror);
1088                 XUngrabServer(dpy);
1089         }
1090 }
1091
1092 void
1093 manage(Window w, XWindowAttributes *wa)
1094 {
1095         Client *c, *t = NULL, *term = NULL;
1096         Window trans = None;
1097         XWindowChanges wc;
1098
1099         c = ecalloc(1, sizeof(Client));
1100         c->win = w;
1101         c->pid = winpid(w);
1102         /* geometry */
1103         c->x = c->oldx = wa->x;
1104         c->y = c->oldy = wa->y;
1105         c->w = c->oldw = wa->width;
1106         c->h = c->oldh = wa->height;
1107         c->oldbw = wa->border_width;
1108
1109         updatetitle(c);
1110         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1111                 c->mon = t->mon;
1112                 c->tags = t->tags;
1113         } else {
1114                 c->mon = selmon;
1115                 applyrules(c);
1116                 term = termforwin(c);
1117         }
1118
1119         if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1120                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1121         if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1122                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1123         c->x = MAX(c->x, c->mon->mx);
1124         /* only fix client y-offset, if the client center might cover the bar */
1125         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1126                 && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1127         c->bw = borderpx;
1128
1129         wc.border_width = c->bw;
1130         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1131         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1132         configure(c); /* propagates border_width, if size doesn't change */
1133         updatewindowtype(c);
1134         updatesizehints(c);
1135         updatewmhints(c);
1136         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1137         grabbuttons(c, 0);
1138         if (!c->isfloating)
1139                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1140         if (c->isfloating)
1141                 XRaiseWindow(dpy, c->win);
1142         attach(c);
1143         attachstack(c);
1144         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1145                 (unsigned char *) &(c->win), 1);
1146         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1147         setclientstate(c, NormalState);
1148         if (c->mon == selmon)
1149                 unfocus(selmon->sel, 0);
1150         c->mon->sel = c;
1151         arrange(c->mon);
1152         XMapWindow(dpy, c->win);
1153         if (term)
1154                 swallow(term, c);
1155         focus(NULL);
1156 }
1157
1158 void
1159 mappingnotify(XEvent *e)
1160 {
1161         XMappingEvent *ev = &e->xmapping;
1162
1163         XRefreshKeyboardMapping(ev);
1164         if (ev->request == MappingKeyboard)
1165                 grabkeys();
1166 }
1167
1168 void
1169 maprequest(XEvent *e)
1170 {
1171         static XWindowAttributes wa;
1172         XMapRequestEvent *ev = &e->xmaprequest;
1173
1174         if (!XGetWindowAttributes(dpy, ev->window, &wa))
1175                 return;
1176         if (wa.override_redirect)
1177                 return;
1178         if (!wintoclient(ev->window))
1179                 manage(ev->window, &wa);
1180 }
1181
1182 void
1183 monocle(Monitor *m)
1184 {
1185         unsigned int n = 0;
1186         Client *c;
1187
1188         for (c = m->clients; c; c = c->next)
1189                 if (ISVISIBLE(c))
1190                         n++;
1191         if (n > 0) /* override layout symbol */
1192                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1193         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1194                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1195 }
1196
1197 void
1198 motionnotify(XEvent *e)
1199 {
1200         static Monitor *mon = NULL;
1201         Monitor *m;
1202         XMotionEvent *ev = &e->xmotion;
1203
1204         if (ev->window != root)
1205                 return;
1206         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1207                 unfocus(selmon->sel, 1);
1208                 selmon = m;
1209                 focus(NULL);
1210         }
1211         mon = m;
1212 }
1213
1214 void
1215 movemouse(const Arg *arg)
1216 {
1217         int x, y, ocx, ocy, nx, ny;
1218         Client *c;
1219         Monitor *m;
1220         XEvent ev;
1221         Time lasttime = 0;
1222
1223         if (!(c = selmon->sel))
1224                 return;
1225         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1226                 return;
1227         restack(selmon);
1228         ocx = c->x;
1229         ocy = c->y;
1230         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1231                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1232                 return;
1233         if (!getrootptr(&x, &y))
1234                 return;
1235         do {
1236                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1237                 switch(ev.type) {
1238                 case ConfigureRequest:
1239                 case Expose:
1240                 case MapRequest:
1241                         handler[ev.type](&ev);
1242                         break;
1243                 case MotionNotify:
1244                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1245                                 continue;
1246                         lasttime = ev.xmotion.time;
1247
1248                         nx = ocx + (ev.xmotion.x - x);
1249                         ny = ocy + (ev.xmotion.y - y);
1250                         if (abs(selmon->wx - nx) < snap)
1251                                 nx = selmon->wx;
1252                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1253                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1254                         if (abs(selmon->wy - ny) < snap)
1255                                 ny = selmon->wy;
1256                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1257                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1258                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1259                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1260                                 togglefloating(NULL);
1261                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1262                                 resize(c, nx, ny, c->w, c->h, 1);
1263                         break;
1264                 }
1265         } while (ev.type != ButtonRelease);
1266         XUngrabPointer(dpy, CurrentTime);
1267         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1268                 sendmon(c, m);
1269                 selmon = m;
1270                 focus(NULL);
1271         }
1272 }
1273
1274 Client *
1275 nexttiled(Client *c)
1276 {
1277         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1278         return c;
1279 }
1280
1281 void
1282 pop(Client *c)
1283 {
1284         detach(c);
1285         attach(c);
1286         focus(c);
1287         arrange(c->mon);
1288 }
1289
1290 void
1291 propertynotify(XEvent *e)
1292 {
1293         Client *c;
1294         Window trans;
1295         XPropertyEvent *ev = &e->xproperty;
1296
1297         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1298                 updatestatus();
1299         else if (ev->state == PropertyDelete)
1300                 return; /* ignore */
1301         else if ((c = wintoclient(ev->window))) {
1302                 switch(ev->atom) {
1303                 default: break;
1304                 case XA_WM_TRANSIENT_FOR:
1305                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1306                                 (c->isfloating = (wintoclient(trans)) != NULL))
1307                                 arrange(c->mon);
1308                         break;
1309                 case XA_WM_NORMAL_HINTS:
1310                         updatesizehints(c);
1311                         break;
1312                 case XA_WM_HINTS:
1313                         updatewmhints(c);
1314                         drawbars();
1315                         break;
1316                 }
1317                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1318                         updatetitle(c);
1319                         if (c == c->mon->sel)
1320                                 drawbar(c->mon);
1321                 }
1322                 if (ev->atom == netatom[NetWMWindowType])
1323                         updatewindowtype(c);
1324         }
1325 }
1326
1327 void
1328 quit(const Arg *arg)
1329 {
1330         running = 0;
1331 }
1332
1333 Monitor *
1334 recttomon(int x, int y, int w, int h)
1335 {
1336         Monitor *m, *r = selmon;
1337         int a, area = 0;
1338
1339         for (m = mons; m; m = m->next)
1340                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1341                         area = a;
1342                         r = m;
1343                 }
1344         return r;
1345 }
1346
1347 void
1348 resize(Client *c, int x, int y, int w, int h, int interact)
1349 {
1350         if (applysizehints(c, &x, &y, &w, &h, interact))
1351                 resizeclient(c, x, y, w, h);
1352 }
1353
1354 void
1355 resizeclient(Client *c, int x, int y, int w, int h)
1356 {
1357         XWindowChanges wc;
1358
1359         c->oldx = c->x; c->x = wc.x = x;
1360         c->oldy = c->y; c->y = wc.y = y;
1361         c->oldw = c->w; c->w = wc.width = w;
1362         c->oldh = c->h; c->h = wc.height = h;
1363         wc.border_width = c->bw;
1364         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1365         configure(c);
1366         XSync(dpy, False);
1367 }
1368
1369 void
1370 resizemouse(const Arg *arg)
1371 {
1372         int ocx, ocy, nw, nh;
1373         Client *c;
1374         Monitor *m;
1375         XEvent ev;
1376         Time lasttime = 0;
1377
1378         if (!(c = selmon->sel))
1379                 return;
1380         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1381                 return;
1382         restack(selmon);
1383         ocx = c->x;
1384         ocy = c->y;
1385         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1386                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1387                 return;
1388         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1389         do {
1390                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1391                 switch(ev.type) {
1392                 case ConfigureRequest:
1393                 case Expose:
1394                 case MapRequest:
1395                         handler[ev.type](&ev);
1396                         break;
1397                 case MotionNotify:
1398                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1399                                 continue;
1400                         lasttime = ev.xmotion.time;
1401
1402                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1403                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1404                         if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1405                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1406                         {
1407                                 if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1408                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1409                                         togglefloating(NULL);
1410                         }
1411                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1412                                 resize(c, c->x, c->y, nw, nh, 1);
1413                         break;
1414                 }
1415         } while (ev.type != ButtonRelease);
1416         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1417         XUngrabPointer(dpy, CurrentTime);
1418         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1419         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1420                 sendmon(c, m);
1421                 selmon = m;
1422                 focus(NULL);
1423         }
1424 }
1425
1426 void
1427 restack(Monitor *m)
1428 {
1429         Client *c;
1430         XEvent ev;
1431         XWindowChanges wc;
1432
1433         drawbar(m);
1434         if (!m->sel)
1435                 return;
1436         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1437                 XRaiseWindow(dpy, m->sel->win);
1438         if (m->lt[m->sellt]->arrange) {
1439                 wc.stack_mode = Below;
1440                 wc.sibling = m->barwin;
1441                 for (c = m->stack; c; c = c->snext)
1442                         if (!c->isfloating && ISVISIBLE(c)) {
1443                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1444                                 wc.sibling = c->win;
1445                         }
1446         }
1447         XSync(dpy, False);
1448         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1449 }
1450
1451 void
1452 run(void)
1453 {
1454         XEvent ev;
1455         /* main event loop */
1456         XSync(dpy, False);
1457         while (running && !XNextEvent(dpy, &ev))
1458                 if (handler[ev.type])
1459                         handler[ev.type](&ev); /* call handler */
1460 }
1461
1462 void
1463 scan(void)
1464 {
1465         unsigned int i, num;
1466         Window d1, d2, *wins = NULL;
1467         XWindowAttributes wa;
1468
1469         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1470                 for (i = 0; i < num; i++) {
1471                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1472                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1473                                 continue;
1474                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1475                                 manage(wins[i], &wa);
1476                 }
1477                 for (i = 0; i < num; i++) { /* now the transients */
1478                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1479                                 continue;
1480                         if (XGetTransientForHint(dpy, wins[i], &d1)
1481                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1482                                 manage(wins[i], &wa);
1483                 }
1484                 if (wins)
1485                         XFree(wins);
1486         }
1487 }
1488
1489 void
1490 sendmon(Client *c, Monitor *m)
1491 {
1492         if (c->mon == m)
1493                 return;
1494         unfocus(c, 1);
1495         detach(c);
1496         detachstack(c);
1497         c->mon = m;
1498         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1499         attach(c);
1500         attachstack(c);
1501         focus(NULL);
1502         arrange(NULL);
1503 }
1504
1505 void
1506 setclientstate(Client *c, long state)
1507 {
1508         long data[] = { state, None };
1509
1510         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1511                 PropModeReplace, (unsigned char *)data, 2);
1512 }
1513
1514 int
1515 sendevent(Client *c, Atom proto)
1516 {
1517         int n;
1518         Atom *protocols;
1519         int exists = 0;
1520         XEvent ev;
1521
1522         if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1523                 while (!exists && n--)
1524                         exists = protocols[n] == proto;
1525                 XFree(protocols);
1526         }
1527         if (exists) {
1528                 ev.type = ClientMessage;
1529                 ev.xclient.window = c->win;
1530                 ev.xclient.message_type = wmatom[WMProtocols];
1531                 ev.xclient.format = 32;
1532                 ev.xclient.data.l[0] = proto;
1533                 ev.xclient.data.l[1] = CurrentTime;
1534                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1535         }
1536         return exists;
1537 }
1538
1539 void
1540 setfocus(Client *c)
1541 {
1542         if (!c->neverfocus) {
1543                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1544                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1545                         XA_WINDOW, 32, PropModeReplace,
1546                         (unsigned char *) &(c->win), 1);
1547         }
1548         sendevent(c, wmatom[WMTakeFocus]);
1549 }
1550
1551 void
1552 setfullscreen(Client *c, int fullscreen)
1553 {
1554         if (fullscreen && !c->isfullscreen) {
1555                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1556                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1557                 c->isfullscreen = 1;
1558                 c->oldstate = c->isfloating;
1559                 c->oldbw = c->bw;
1560                 c->bw = 0;
1561                 c->isfloating = 1;
1562                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1563                 XRaiseWindow(dpy, c->win);
1564         } else if (!fullscreen && c->isfullscreen){
1565                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1566                         PropModeReplace, (unsigned char*)0, 0);
1567                 c->isfullscreen = 0;
1568                 c->isfloating = c->oldstate;
1569                 c->bw = c->oldbw;
1570                 c->x = c->oldx;
1571                 c->y = c->oldy;
1572                 c->w = c->oldw;
1573                 c->h = c->oldh;
1574                 resizeclient(c, c->x, c->y, c->w, c->h);
1575                 arrange(c->mon);
1576         }
1577 }
1578
1579 void
1580 setlayout(const Arg *arg)
1581 {
1582         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1583                 selmon->sellt ^= 1;
1584         if (arg && arg->v)
1585                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1586         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1587         if (selmon->sel)
1588                 arrange(selmon);
1589         else
1590                 drawbar(selmon);
1591 }
1592
1593 /* arg > 1.0 will set mfact absolutely */
1594 void
1595 setmfact(const Arg *arg)
1596 {
1597         float f;
1598
1599         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1600                 return;
1601         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1602         if (f < 0.05 || f > 0.95)
1603                 return;
1604         selmon->mfact = f;
1605         arrange(selmon);
1606 }
1607
1608 void
1609 setup(void)
1610 {
1611         int i;
1612         XSetWindowAttributes wa;
1613         Atom utf8string;
1614
1615         /* clean up any zombies immediately */
1616         sigchld(0);
1617
1618         /* init screen */
1619         screen = DefaultScreen(dpy);
1620         sw = DisplayWidth(dpy, screen);
1621         sh = DisplayHeight(dpy, screen);
1622         root = RootWindow(dpy, screen);
1623         drw = drw_create(dpy, screen, root, sw, sh);
1624         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1625                 die("no fonts could be loaded.");
1626         lrpad = drw->fonts->h;
1627         bh = drw->fonts->h + 2;
1628         updategeom();
1629         /* init atoms */
1630         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1631         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1632         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1633         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1634         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1635         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1636         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1637         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1638         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1639         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1640         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1641         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1642         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1643         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1644         /* init cursors */
1645         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1646         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1647         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1648         /* init appearance */
1649         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1650         for (i = 0; i < LENGTH(colors); i++)
1651                 scheme[i] = drw_scm_create(drw, colors[i], 3);
1652         /* init bars */
1653         updatebars();
1654         updatestatus();
1655         /* supporting window for NetWMCheck */
1656         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1657         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1658                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1659         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1660                 PropModeReplace, (unsigned char *) "dwm", 3);
1661         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1662                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1663         /* EWMH support per view */
1664         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1665                 PropModeReplace, (unsigned char *) netatom, NetLast);
1666         XDeleteProperty(dpy, root, netatom[NetClientList]);
1667         /* select events */
1668         wa.cursor = cursor[CurNormal]->cursor;
1669         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1670                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1671                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1672         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1673         XSelectInput(dpy, root, wa.event_mask);
1674         grabkeys();
1675         focus(NULL);
1676 }
1677
1678
1679 void
1680 seturgent(Client *c, int urg)
1681 {
1682         XWMHints *wmh;
1683
1684         c->isurgent = urg;
1685         if (!(wmh = XGetWMHints(dpy, c->win)))
1686                 return;
1687         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1688         XSetWMHints(dpy, c->win, wmh);
1689         XFree(wmh);
1690 }
1691
1692 void
1693 showhide(Client *c)
1694 {
1695         if (!c)
1696                 return;
1697         if (ISVISIBLE(c)) {
1698                 /* show clients top down */
1699                 XMoveWindow(dpy, c->win, c->x, c->y);
1700                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1701                         resize(c, c->x, c->y, c->w, c->h, 0);
1702                 showhide(c->snext);
1703         } else {
1704                 /* hide clients bottom up */
1705                 showhide(c->snext);
1706                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1707         }
1708 }
1709
1710 void
1711 sigchld(int unused)
1712 {
1713         if (signal(SIGCHLD, sigchld) == SIG_ERR)
1714                 die("can't install SIGCHLD handler:");
1715         while (0 < waitpid(-1, NULL, WNOHANG));
1716 }
1717
1718 void
1719 spawn(const Arg *arg)
1720 {
1721         if (arg->v == dmenucmd)
1722                 dmenumon[0] = '0' + selmon->num;
1723         if (fork() == 0) {
1724                 if (dpy)
1725                         close(ConnectionNumber(dpy));
1726                 setsid();
1727                 execvp(((char **)arg->v)[0], (char **)arg->v);
1728                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1729                 perror(" failed");
1730                 exit(EXIT_SUCCESS);
1731         }
1732 }
1733
1734 void
1735 tag(const Arg *arg)
1736 {
1737         if (selmon->sel && arg->ui & TAGMASK) {
1738                 selmon->sel->tags = arg->ui & TAGMASK;
1739                 focus(NULL);
1740                 arrange(selmon);
1741         }
1742 }
1743
1744 void
1745 tagmon(const Arg *arg)
1746 {
1747         if (!selmon->sel || !mons->next)
1748                 return;
1749         sendmon(selmon->sel, dirtomon(arg->i));
1750 }
1751
1752 void
1753 tile(Monitor *m)
1754 {
1755         unsigned int i, n, h, mw, my, ty;
1756         Client *c;
1757
1758         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1759         if (n == 0)
1760                 return;
1761
1762         if (n > m->nmaster)
1763                 mw = m->nmaster ? m->ww * m->mfact : 0;
1764         else
1765                 mw = m->ww;
1766         for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1767                 if (i < m->nmaster) {
1768                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1769                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1770                         if (my + HEIGHT(c) < m->wh)
1771                                 my += HEIGHT(c);
1772                 } else {
1773                         h = (m->wh - ty) / (n - i);
1774                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1775                         if (ty + HEIGHT(c) < m->wh)
1776                                 ty += HEIGHT(c);
1777                 }
1778 }
1779
1780 void
1781 togglebar(const Arg *arg)
1782 {
1783         selmon->showbar = !selmon->showbar;
1784         updatebarpos(selmon);
1785         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1786         arrange(selmon);
1787 }
1788
1789 void
1790 togglefloating(const Arg *arg)
1791 {
1792         if (!selmon->sel)
1793                 return;
1794         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1795                 return;
1796         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1797         if (selmon->sel->isfloating)
1798                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1799                         selmon->sel->w, selmon->sel->h, 0);
1800         arrange(selmon);
1801 }
1802
1803 void
1804 toggletag(const Arg *arg)
1805 {
1806         unsigned int newtags;
1807
1808         if (!selmon->sel)
1809                 return;
1810         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1811         if (newtags) {
1812                 selmon->sel->tags = newtags;
1813                 focus(NULL);
1814                 arrange(selmon);
1815         }
1816 }
1817
1818 void
1819 toggleview(const Arg *arg)
1820 {
1821         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1822
1823         if (newtagset) {
1824                 selmon->tagset[selmon->seltags] = newtagset;
1825                 focus(NULL);
1826                 arrange(selmon);
1827         }
1828 }
1829
1830 void
1831 unfocus(Client *c, int setfocus)
1832 {
1833         if (!c)
1834                 return;
1835         grabbuttons(c, 0);
1836         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1837         if (setfocus) {
1838                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1839                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1840         }
1841 }
1842
1843 void
1844 unmanage(Client *c, int destroyed)
1845 {
1846         Monitor *m = c->mon;
1847         XWindowChanges wc;
1848
1849         if (c->swallowing) {
1850                 unswallow(c);
1851                 return;
1852         }
1853
1854         Client *s = swallowingclient(c->win);
1855         if (s) {
1856                 free(s->swallowing);
1857                 s->swallowing = NULL;
1858                 arrange(m);
1859                 focus(NULL);
1860                 return;
1861         }
1862
1863         detach(c);
1864         detachstack(c);
1865         if (!destroyed) {
1866                 wc.border_width = c->oldbw;
1867                 XGrabServer(dpy); /* avoid race conditions */
1868                 XSetErrorHandler(xerrordummy);
1869                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1870                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1871                 setclientstate(c, WithdrawnState);
1872                 XSync(dpy, False);
1873                 XSetErrorHandler(xerror);
1874                 XUngrabServer(dpy);
1875         }
1876         free(c);
1877
1878         if (!s) {
1879                 arrange(m);
1880                 focus(NULL);
1881                 updateclientlist();
1882         }
1883 }
1884
1885 void
1886 unmapnotify(XEvent *e)
1887 {
1888         Client *c;
1889         XUnmapEvent *ev = &e->xunmap;
1890
1891         if ((c = wintoclient(ev->window))) {
1892                 if (ev->send_event)
1893                         setclientstate(c, WithdrawnState);
1894                 else
1895                         unmanage(c, 0);
1896         }
1897 }
1898
1899 void
1900 updatebars(void)
1901 {
1902         Monitor *m;
1903         XSetWindowAttributes wa = {
1904                 .override_redirect = True,
1905                 .background_pixmap = ParentRelative,
1906                 .event_mask = ButtonPressMask|ExposureMask
1907         };
1908         XClassHint ch = {"dwm", "dwm"};
1909         for (m = mons; m; m = m->next) {
1910                 if (m->barwin)
1911                         continue;
1912                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1913                                 CopyFromParent, DefaultVisual(dpy, screen),
1914                                 CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1915                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1916                 XMapRaised(dpy, m->barwin);
1917                 XSetClassHint(dpy, m->barwin, &ch);
1918         }
1919 }
1920
1921 void
1922 updatebarpos(Monitor *m)
1923 {
1924         m->wy = m->my;
1925         m->wh = m->mh;
1926         if (m->showbar) {
1927                 m->wh -= bh;
1928                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1929                 m->wy = m->topbar ? m->wy + bh : m->wy;
1930         } else
1931                 m->by = -bh;
1932 }
1933
1934 void
1935 updateclientlist()
1936 {
1937         Client *c;
1938         Monitor *m;
1939
1940         XDeleteProperty(dpy, root, netatom[NetClientList]);
1941         for (m = mons; m; m = m->next)
1942                 for (c = m->clients; c; c = c->next)
1943                         XChangeProperty(dpy, root, netatom[NetClientList],
1944                                 XA_WINDOW, 32, PropModeAppend,
1945                                 (unsigned char *) &(c->win), 1);
1946 }
1947
1948 int
1949 updategeom(void)
1950 {
1951         int dirty = 0;
1952
1953 #ifdef XINERAMA
1954         if (XineramaIsActive(dpy)) {
1955                 int i, j, n, nn;
1956                 Client *c;
1957                 Monitor *m;
1958                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1959                 XineramaScreenInfo *unique = NULL;
1960
1961                 for (n = 0, m = mons; m; m = m->next, n++);
1962                 /* only consider unique geometries as separate screens */
1963                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1964                 for (i = 0, j = 0; i < nn; i++)
1965                         if (isuniquegeom(unique, j, &info[i]))
1966                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1967                 XFree(info);
1968                 nn = j;
1969                 if (n <= nn) { /* new monitors available */
1970                         for (i = 0; i < (nn - n); i++) {
1971                                 for (m = mons; m && m->next; m = m->next);
1972                                 if (m)
1973                                         m->next = createmon();
1974                                 else
1975                                         mons = createmon();
1976                         }
1977                         for (i = 0, m = mons; i < nn && m; m = m->next, i++)
1978                                 if (i >= n
1979                                 || unique[i].x_org != m->mx || unique[i].y_org != m->my
1980                                 || unique[i].width != m->mw || unique[i].height != m->mh)
1981                                 {
1982                                         dirty = 1;
1983                                         m->num = i;
1984                                         m->mx = m->wx = unique[i].x_org;
1985                                         m->my = m->wy = unique[i].y_org;
1986                                         m->mw = m->ww = unique[i].width;
1987                                         m->mh = m->wh = unique[i].height;
1988                                         updatebarpos(m);
1989                                 }
1990                 } else { /* less monitors available nn < n */
1991                         for (i = nn; i < n; i++) {
1992                                 for (m = mons; m && m->next; m = m->next);
1993                                 while ((c = m->clients)) {
1994                                         dirty = 1;
1995                                         m->clients = c->next;
1996                                         detachstack(c);
1997                                         c->mon = mons;
1998                                         attach(c);
1999                                         attachstack(c);
2000                                 }
2001                                 if (m == selmon)
2002                                         selmon = mons;
2003                                 cleanupmon(m);
2004                         }
2005                 }
2006                 free(unique);
2007         } else
2008 #endif /* XINERAMA */
2009         { /* default monitor setup */
2010                 if (!mons)
2011                         mons = createmon();
2012                 if (mons->mw != sw || mons->mh != sh) {
2013                         dirty = 1;
2014                         mons->mw = mons->ww = sw;
2015                         mons->mh = mons->wh = sh;
2016                         updatebarpos(mons);
2017                 }
2018         }
2019         if (dirty) {
2020                 selmon = mons;
2021                 selmon = wintomon(root);
2022         }
2023         return dirty;
2024 }
2025
2026 void
2027 updatenumlockmask(void)
2028 {
2029         unsigned int i, j;
2030         XModifierKeymap *modmap;
2031
2032         numlockmask = 0;
2033         modmap = XGetModifierMapping(dpy);
2034         for (i = 0; i < 8; i++)
2035                 for (j = 0; j < modmap->max_keypermod; j++)
2036                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
2037                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
2038                                 numlockmask = (1 << i);
2039         XFreeModifiermap(modmap);
2040 }
2041
2042 void
2043 updatesizehints(Client *c)
2044 {
2045         long msize;
2046         XSizeHints size;
2047
2048         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
2049                 /* size is uninitialized, ensure that size.flags aren't used */
2050                 size.flags = PSize;
2051         if (size.flags & PBaseSize) {
2052                 c->basew = size.base_width;
2053                 c->baseh = size.base_height;
2054         } else if (size.flags & PMinSize) {
2055                 c->basew = size.min_width;
2056                 c->baseh = size.min_height;
2057         } else
2058                 c->basew = c->baseh = 0;
2059         if (size.flags & PResizeInc) {
2060                 c->incw = size.width_inc;
2061                 c->inch = size.height_inc;
2062         } else
2063                 c->incw = c->inch = 0;
2064         if (size.flags & PMaxSize) {
2065                 c->maxw = size.max_width;
2066                 c->maxh = size.max_height;
2067         } else
2068                 c->maxw = c->maxh = 0;
2069         if (size.flags & PMinSize) {
2070                 c->minw = size.min_width;
2071                 c->minh = size.min_height;
2072         } else if (size.flags & PBaseSize) {
2073                 c->minw = size.base_width;
2074                 c->minh = size.base_height;
2075         } else
2076                 c->minw = c->minh = 0;
2077         if (size.flags & PAspect) {
2078                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2079                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2080         } else
2081                 c->maxa = c->mina = 0.0;
2082         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
2083 }
2084
2085 void
2086 updatestatus(void)
2087 {
2088         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2089                 strcpy(stext, "dwm-"VERSION);
2090         drawbar(selmon);
2091 }
2092
2093 void
2094 updatetitle(Client *c)
2095 {
2096         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2097                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2098         if (c->name[0] == '\0') /* hack to mark broken clients */
2099                 strcpy(c->name, broken);
2100 }
2101
2102 void
2103 updatewindowtype(Client *c)
2104 {
2105         Atom state = getatomprop(c, netatom[NetWMState]);
2106         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2107
2108         if (state == netatom[NetWMFullscreen])
2109                 setfullscreen(c, 1);
2110         if (wtype == netatom[NetWMWindowTypeDialog])
2111                 c->isfloating = 1;
2112 }
2113
2114 void
2115 updatewmhints(Client *c)
2116 {
2117         XWMHints *wmh;
2118
2119         if ((wmh = XGetWMHints(dpy, c->win))) {
2120                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2121                         wmh->flags &= ~XUrgencyHint;
2122                         XSetWMHints(dpy, c->win, wmh);
2123                 } else
2124                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2125                 if (wmh->flags & InputHint)
2126                         c->neverfocus = !wmh->input;
2127                 else
2128                         c->neverfocus = 0;
2129                 XFree(wmh);
2130         }
2131 }
2132
2133 void
2134 view(const Arg *arg)
2135 {
2136         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2137                 return;
2138         selmon->seltags ^= 1; /* toggle sel tagset */
2139         if (arg->ui & TAGMASK)
2140                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2141         focus(NULL);
2142         arrange(selmon);
2143 }
2144
2145 pid_t
2146 winpid(Window w)
2147 {
2148
2149         pid_t result = 0;
2150
2151 #ifdef __linux__
2152         xcb_res_client_id_spec_t spec = {0};
2153         spec.client = w;
2154         spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
2155
2156         xcb_generic_error_t *e = NULL;
2157         xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
2158         xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
2159
2160         if (!r)
2161                 return (pid_t)0;
2162
2163         xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
2164         for (; i.rem; xcb_res_client_id_value_next(&i)) {
2165                 spec = i.data->spec;
2166                 if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
2167                         uint32_t *t = xcb_res_client_id_value_value(i.data);
2168                         result = *t;
2169                         break;
2170                 }
2171         }
2172
2173         free(r);
2174
2175         if (result == (pid_t)-1)
2176                 result = 0;
2177
2178 #endif /* __linux__ */
2179
2180 #ifdef __OpenBSD__
2181         Atom type;
2182         int format;
2183         unsigned long len, bytes;
2184         unsigned char *prop;
2185         pid_t ret;
2186
2187         if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 0), 0, 1, False, AnyPropertyType, &type, &format, &len, &bytes, &prop) != Success || !prop)
2188                return 0;
2189
2190         ret = *(pid_t*)prop;
2191         XFree(prop);
2192         result = ret;
2193
2194 #endif /* __OpenBSD__ */
2195         return result;
2196 }
2197
2198 pid_t
2199 getparentprocess(pid_t p)
2200 {
2201         unsigned int v = 0;
2202
2203 #ifdef __linux__
2204         FILE *f;
2205         char buf[256];
2206         snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
2207
2208         if (!(f = fopen(buf, "r")))
2209                 return 0;
2210
2211         fscanf(f, "%*u %*s %*c %u", &v);
2212         fclose(f);
2213 #endif /* __linux__*/
2214
2215 #ifdef __OpenBSD__
2216         int n;
2217         kvm_t *kd;
2218         struct kinfo_proc *kp;
2219
2220         kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
2221         if (!kd)
2222                 return 0;
2223
2224         kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
2225         v = kp->p_ppid;
2226 #endif /* __OpenBSD__ */
2227
2228         return (pid_t)v;
2229 }
2230
2231 int
2232 isdescprocess(pid_t p, pid_t c)
2233 {
2234         while (p != c && c != 0)
2235                 c = getparentprocess(c);
2236
2237         return (int)c;
2238 }
2239
2240 Client *
2241 termforwin(const Client *w)
2242 {
2243         Client *c;
2244         Monitor *m;
2245
2246         if (!w->pid || w->isterminal)
2247                 return NULL;
2248
2249         for (m = mons; m; m = m->next) {
2250                 for (c = m->clients; c; c = c->next) {
2251                         if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
2252                                 return c;
2253                 }
2254         }
2255
2256         return NULL;
2257 }
2258
2259 Client *
2260 swallowingclient(Window w)
2261 {
2262         Client *c;
2263         Monitor *m;
2264
2265         for (m = mons; m; m = m->next) {
2266                 for (c = m->clients; c; c = c->next) {
2267                         if (c->swallowing && c->swallowing->win == w)
2268                                 return c;
2269                 }
2270         }
2271
2272         return NULL;
2273 }
2274
2275 Client *
2276 wintoclient(Window w)
2277 {
2278         Client *c;
2279         Monitor *m;
2280
2281         for (m = mons; m; m = m->next)
2282                 for (c = m->clients; c; c = c->next)
2283                         if (c->win == w)
2284                                 return c;
2285         return NULL;
2286 }
2287
2288 Monitor *
2289 wintomon(Window w)
2290 {
2291         int x, y;
2292         Client *c;
2293         Monitor *m;
2294
2295         if (w == root && getrootptr(&x, &y))
2296                 return recttomon(x, y, 1, 1);
2297         for (m = mons; m; m = m->next)
2298                 if (w == m->barwin)
2299                         return m;
2300         if ((c = wintoclient(w)))
2301                 return c->mon;
2302         return selmon;
2303 }
2304
2305 /* There's no way to check accesses to destroyed windows, thus those cases are
2306  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2307  * default error handler, which may call exit. */
2308 int
2309 xerror(Display *dpy, XErrorEvent *ee)
2310 {
2311         if (ee->error_code == BadWindow
2312         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2313         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2314         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2315         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2316         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2317         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2318         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2319         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2320                 return 0;
2321         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2322                 ee->request_code, ee->error_code);
2323         return xerrorxlib(dpy, ee); /* may call exit */
2324 }
2325
2326 int
2327 xerrordummy(Display *dpy, XErrorEvent *ee)
2328 {
2329         return 0;
2330 }
2331
2332 /* Startup Error handler to check if another window manager
2333  * is already running. */
2334 int
2335 xerrorstart(Display *dpy, XErrorEvent *ee)
2336 {
2337         die("dwm: another window manager is already running");
2338         return -1;
2339 }
2340
2341 void
2342 zoom(const Arg *arg)
2343 {
2344         Client *c = selmon->sel;
2345
2346         if (!selmon->lt[selmon->sellt]->arrange
2347         || (selmon->sel && selmon->sel->isfloating))
2348                 return;
2349         if (c == nexttiled(selmon->clients))
2350                 if (!c || !(c = nexttiled(c->next)))
2351                         return;
2352         pop(c);
2353 }
2354
2355 int
2356 main(int argc, char *argv[])
2357 {
2358         if (argc == 2 && !strcmp("-v", argv[1]))
2359                 die("dwm-"VERSION);
2360         else if (argc != 1)
2361                 die("usage: dwm [-v]");
2362         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2363                 fputs("warning: no locale support\n", stderr);
2364         if (!(dpy = XOpenDisplay(NULL)))
2365                 die("dwm: cannot open display");
2366         if (!(xcon = XGetXCBConnection(dpy)))
2367                 die("dwm: cannot get xcb connection\n");
2368         checkotherwm();
2369         setup();
2370 #ifdef __OpenBSD__
2371         if (pledge("stdio rpath proc exec ps", NULL) == -1)
2372                 die("pledge");
2373 #endif /* __OpenBSD__ */
2374         scan();
2375         run();
2376         cleanup();
2377         XCloseDisplay(dpy);
2378         return EXIT_SUCCESS;
2379 }