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 #define OPAQUE                  0xffU
  67
  68 /* enums */
  69 enum { CurNormal, CurResize, CurMove, CurLast }; /* cursor */
  70 enum { SchemeNorm, SchemeSel }; /* color schemes */
  71 enum { NetSupported, NetWMName, NetWMState, NetWMCheck,
  72        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  73        NetWMWindowTypeDialog, NetClientList, NetLast }; /* EWMH atoms */
  74 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  75 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  76        ClkClientWin, ClkRootWin, ClkLast }; /* clicks */
  77
  78 typedef union {
  79         int i;
  80         unsigned int ui;
  81         float f;
  82         const void *v;
  83 } Arg;
  84
  85 typedef struct {
  86         unsigned int click;
  87         unsigned int mask;
  88         unsigned int button;
  89         void (*func)(const Arg *arg);
  90         const Arg arg;
  91 } Button;
  92
  93 typedef struct Monitor Monitor;
  94 typedef struct Client Client;
  95 struct Client {
  96         char name[256];
  97         float mina, maxa;
  98         int x, y, w, h;
  99         int oldx, oldy, oldw, oldh;
 100         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 101         int bw, oldbw;
 102         unsigned int tags;
 103         int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen, isterminal, noswallow;
 104         pid_t pid;
 105         Client *next;
 106         Client *snext;
 107         Client *swallowing;
 108         Monitor *mon;
 109         Window win;
 110 };
 111
 112 typedef struct {
 113         unsigned int mod;
 114         KeySym keysym;
 115         void (*func)(const Arg *);
 116         const Arg arg;
 117 } Key;
 118
 119 typedef struct {
 120         const char *symbol;
 121         void (*arrange)(Monitor *);
 122 } Layout;
 123
 124 struct Monitor {
 125         char ltsymbol[16];
 126         float mfact;
 127         int nmaster;
 128         int num;
 129         int by;               /* bar geometry */
 130         int mx, my, mw, mh;   /* screen size */
 131         int wx, wy, ww, wh;   /* window area  */
 132         unsigned int seltags;
 133         unsigned int sellt;
 134         unsigned int tagset[2];
 135         int showbar;
 136         int topbar;
 137         Client *clients;
 138         Client *sel;
 139         Client *stack;
 140         Monitor *next;
 141         Window barwin;
 142         const Layout *lt[2];
 143 };
 144
 145 typedef struct {
 146         const char *class;
 147         const char *instance;
 148         const char *title;
 149         unsigned int tags;
 150         int isfloating;
 151         int isterminal;
 152         int noswallow;
 153         int monitor;
 154 } Rule;
 155
 156 /* function declarations */
 157 static void applyrules(Client *c);
 158 static int applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact);
 159 static void arrange(Monitor *m);
 160 static void arrangemon(Monitor *m);
 161 static void attach(Client *c);
 162 static void attachstack(Client *c);
 163 static void buttonpress(XEvent *e);
 164 static void checkotherwm(void);
 165 static void cleanup(void);
 166 static void cleanupmon(Monitor *mon);
 167 static void clientmessage(XEvent *e);
 168 static void configure(Client *c);
 169 static void configurenotify(XEvent *e);
 170 static void configurerequest(XEvent *e);
 171 static Monitor *createmon(void);
 172 static void destroynotify(XEvent *e);
 173 static void detach(Client *c);
 174 static void detachstack(Client *c);
 175 static Monitor *dirtomon(int dir);
 176 static void drawbar(Monitor *m);
 177 static void drawbars(void);
 178 static void enternotify(XEvent *e);
 179 static void expose(XEvent *e);
 180 static void focus(Client *c);
 181 static void focusin(XEvent *e);
 182 static void focusmon(const Arg *arg);
 183 static void focusstack(const Arg *arg);
 184 static Atom getatomprop(Client *c, Atom prop);
 185 static int getrootptr(int *x, int *y);
 186 static long getstate(Window w);
 187 static int gettextprop(Window w, Atom atom, char *text, unsigned int size);
 188 static void grabbuttons(Client *c, int focused);
 189 static void grabkeys(void);
 190 static void incnmaster(const Arg *arg);
 191 static void keypress(XEvent *e);
 192 static void killclient(const Arg *arg);
 193 static void manage(Window w, XWindowAttributes *wa);
 194 static void mappingnotify(XEvent *e);
 195 static void maprequest(XEvent *e);
 196 static void monocle(Monitor *m);
 197 static void motionnotify(XEvent *e);
 198 static void movemouse(const Arg *arg);
 199 static Client *nexttiled(Client *c);
 200 static void pop(Client *);
 201 static void propertynotify(XEvent *e);
 202 static void quit(const Arg *arg);
 203 static Monitor *recttomon(int x, int y, int w, int h);
 204 static void resize(Client *c, int x, int y, int w, int h, int interact);
 205 static void resizeclient(Client *c, int x, int y, int w, int h);
 206 static void resizemouse(const Arg *arg);
 207 static void restack(Monitor *m);
 208 static void run(void);
 209 static void scan(void);
 210 static int sendevent(Client *c, Atom proto);
 211 static void sendmon(Client *c, Monitor *m);
 212 static void setclientstate(Client *c, long state);
 213 static void setfocus(Client *c);
 214 static void setfullscreen(Client *c, int fullscreen);
 215 static void fullscreen(const Arg *arg);
 216 static void setlayout(const Arg *arg);
 217 static void setmfact(const Arg *arg);
 218 static void setup(void);
 219 static void seturgent(Client *c, int urg);
 220 static void showhide(Client *c);
 221 static void sigchld(int unused);
 222 static void spawn(const Arg *arg);
 223 static void tag(const Arg *arg);
 224 static void tagmon(const Arg *arg);
 225 static void tile(Monitor *);
 226 static void togglebar(const Arg *arg);
 227 static void togglefloating(const Arg *arg);
 228 static void toggletag(const Arg *arg);
 229 static void toggleview(const Arg *arg);
 230 static void unfocus(Client *c, int setfocus);
 231 static void unmanage(Client *c, int destroyed);
 232 static void unmapnotify(XEvent *e);
 233 static void updatebarpos(Monitor *m);
 234 static void updatebars(void);
 235 static void updateclientlist(void);
 236 static int updategeom(void);
 237 static void updatenumlockmask(void);
 238 static void updatesizehints(Client *c);
 239 static void updatestatus(void);
 240 static void updatetitle(Client *c);
 241 static void updatewindowtype(Client *c);
 242 static void updatewmhints(Client *c);
 243 static void view(const Arg *arg);
 244 static Client *wintoclient(Window w);
 245 static Monitor *wintomon(Window w);
 246 static int xerror(Display *dpy, XErrorEvent *ee);
 247 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 248 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 249 static void xinitvisual();
 250 static void zoom(const Arg *arg);
 251
 252 static pid_t getparentprocess(pid_t p);
 253 static int isdescprocess(pid_t p, pid_t c);
 254 static Client *swallowingclient(Window w);
 255 static Client *termforwin(const Client *c);
 256 static pid_t winpid(Window w);
 257
 258 /* variables */
 259 static const char broken[] = "broken";
 260 static char stext[256];
 261 static int screen;
 262 static int sw, sh;           /* X display screen geometry width, height */
 263 static int bh, blw = 0;      /* bar geometry */
 264 static int lrpad;            /* sum of left and right padding for text */
 265 static int (*xerrorxlib)(Display *, XErrorEvent *);
 266 static unsigned int numlockmask = 0;
 267 static void (*handler[LASTEvent]) (XEvent *) = {
 268         [ButtonPress] = buttonpress,
 269         [ClientMessage] = clientmessage,
 270         [ConfigureRequest] = configurerequest,
 271         [ConfigureNotify] = configurenotify,
 272         [DestroyNotify] = destroynotify,
 273         [EnterNotify] = enternotify,
 274         [Expose] = expose,
 275         [FocusIn] = focusin,
 276         [KeyPress] = keypress,
 277         [MappingNotify] = mappingnotify,
 278         [MapRequest] = maprequest,
 279         [MotionNotify] = motionnotify,
 280         [PropertyNotify] = propertynotify,
 281         [UnmapNotify] = unmapnotify
 282 };
 283 static Atom wmatom[WMLast], netatom[NetLast];
 284 static int running = 1;
 285 static Cur *cursor[CurLast];
 286 static Clr **scheme;
 287 static Display *dpy;
 288 static Drw *drw;
 289 static Monitor *mons, *selmon;
 290 static Window root, wmcheckwin;
 291
 292 static xcb_connection_t *xcon;
 293
 294 static int useargb = 0;
 295 static Visual *visual;
 296 static int depth;
 297 static Colormap cmap;
 298
 299 /* configuration, allows nested code to access above variables */
 300 #include "config.h"
 301
 302 /* compile-time check if all tags fit into an unsigned int bit array. */
 303 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 304
 305 /* function implementations */
 306 void
 307 applyrules(Client *c)
 308 {
 309         const char *class, *instance;
 310         unsigned int i;
 311         const Rule *r;
 312         Monitor *m;
 313         XClassHint ch = { NULL, NULL };
 314
 315         /* rule matching */
 316         c->isfloating = 0;
 317         c->tags = 0;
 318         XGetClassHint(dpy, c->win, &ch);
 319         class    = ch.res_class ? ch.res_class : broken;
 320         instance = ch.res_name  ? ch.res_name  : broken;
 321
 322         for (i = 0; i < LENGTH(rules); i++) {
 323                 r = &rules[i];
 324                 if ((!r->title || strstr(c->name, r->title))
 325                 && (!r->class || strstr(class, r->class))
 326                 && (!r->instance || strstr(instance, r->instance)))
 327                 {
 328                         c->isterminal = r->isterminal;
 329                         c->noswallow  = r->noswallow;
 330                         c->isfloating = r->isfloating;
 331                         c->tags |= r->tags;
 332                         for (m = mons; m && m->num != r->monitor; m = m->next);
 333                         if (m)
 334                                 c->mon = m;
 335                 }
 336         }
 337         if (ch.res_class)
 338                 XFree(ch.res_class);
 339         if (ch.res_name)
 340                 XFree(ch.res_name);
 341         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 342 }
 343
 344 int
 345 applysizehints(Client *c, int *x, int *y, int *w, int *h, int interact)
 346 {
 347         int baseismin;
 348         Monitor *m = c->mon;
 349
 350         /* set minimum possible */
 351         *w = MAX(1, *w);
 352         *h = MAX(1, *h);
 353         if (interact) {
 354                 if (*x > sw)
 355                         *x = sw - WIDTH(c);
 356                 if (*y > sh)
 357                         *y = sh - HEIGHT(c);
 358                 if (*x + *w + 2 * c->bw < 0)
 359                         *x = 0;
 360                 if (*y + *h + 2 * c->bw < 0)
 361                         *y = 0;
 362         } else {
 363                 if (*x >= m->wx + m->ww)
 364                         *x = m->wx + m->ww - WIDTH(c);
 365                 if (*y >= m->wy + m->wh)
 366                         *y = m->wy + m->wh - HEIGHT(c);
 367                 if (*x + *w + 2 * c->bw <= m->wx)
 368                         *x = m->wx;
 369                 if (*y + *h + 2 * c->bw <= m->wy)
 370                         *y = m->wy;
 371         }
 372         if (*h < bh)
 373                 *h = bh;
 374         if (*w < bh)
 375                 *w = bh;
 376         if (resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 377                 /* see last two sentences in ICCCM 4.1.2.3 */
 378                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 379                 if (!baseismin) { /* temporarily remove base dimensions */
 380                         *w -= c->basew;
 381                         *h -= c->baseh;
 382                 }
 383                 /* adjust for aspect limits */
 384                 if (c->mina > 0 && c->maxa > 0) {
 385                         if (c->maxa < (float)*w / *h)
 386                                 *w = *h * c->maxa + 0.5;
 387                         else if (c->mina < (float)*h / *w)
 388                                 *h = *w * c->mina + 0.5;
 389                 }
 390                 if (baseismin) { /* increment calculation requires this */
 391                         *w -= c->basew;
 392                         *h -= c->baseh;
 393                 }
 394                 /* adjust for increment value */
 395                 if (c->incw)
 396                         *w -= *w % c->incw;
 397                 if (c->inch)
 398                         *h -= *h % c->inch;
 399                 /* restore base dimensions */
 400                 *w = MAX(*w + c->basew, c->minw);
 401                 *h = MAX(*h + c->baseh, c->minh);
 402                 if (c->maxw)
 403                         *w = MIN(*w, c->maxw);
 404                 if (c->maxh)
 405                         *h = MIN(*h, c->maxh);
 406         }
 407         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 408 }
 409
 410 void
 411 arrange(Monitor *m)
 412 {
 413         if (m)
 414                 showhide(m->stack);
 415         else for (m = mons; m; m = m->next)
 416                 showhide(m->stack);
 417         if (m) {
 418                 arrangemon(m);
 419                 restack(m);
 420         } else for (m = mons; m; m = m->next)
 421                 arrangemon(m);
 422 }
 423
 424 void
 425 arrangemon(Monitor *m)
 426 {
 427         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 428         if (m->lt[m->sellt]->arrange)
 429                 m->lt[m->sellt]->arrange(m);
 430 }
 431
 432 void
 433 attach(Client *c)
 434 {
 435         c->next = c->mon->clients;
 436         c->mon->clients = c;
 437 }
 438
 439 void
 440 attachstack(Client *c)
 441 {
 442         c->snext = c->mon->stack;
 443         c->mon->stack = c;
 444 }
 445
 446 void
 447 swallow(Client *p, Client *c)
 448 {
 449
 450         if (c->noswallow || c->isterminal)
 451                 return;
 452         if (c->noswallow && !swallowfloating && c->isfloating)
 453                 return;
 454
 455         detach(c);
 456         detachstack(c);
 457
 458         setclientstate(c, WithdrawnState);
 459         XUnmapWindow(dpy, p->win);
 460
 461         p->swallowing = c;
 462         c->mon = p->mon;
 463
 464         Window w = p->win;
 465         p->win = c->win;
 466         c->win = w;
 467         updatetitle(p);
 468         XMoveResizeWindow(dpy, p->win, p->x, p->y, p->w, p->h);
 469         arrange(p->mon);
 470         configure(p);
 471         updateclientlist();
 472 }
 473
 474 void
 475 unswallow(Client *c)
 476 {
 477         c->win = c->swallowing->win;
 478
 479         free(c->swallowing);
 480         c->swallowing = NULL;
 481
 482         /* unfullscreen the client */
 483         setfullscreen(c, 0);
 484         updatetitle(c);
 485         arrange(c->mon);
 486         XMapWindow(dpy, c->win);
 487         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 488         setclientstate(c, NormalState);
 489         focus(NULL);
 490         arrange(c->mon);
 491 }
 492
 493 void
 494 buttonpress(XEvent *e)
 495 {
 496         unsigned int i, x, click;
 497         Arg arg = {0};
 498         Client *c;
 499         Monitor *m;
 500         XButtonPressedEvent *ev = &e->xbutton;
 501
 502         click = ClkRootWin;
 503         /* focus monitor if necessary */
 504         if ((m = wintomon(ev->window)) && m != selmon) {
 505                 unfocus(selmon->sel, 1);
 506                 selmon = m;
 507                 focus(NULL);
 508         }
 509         if (ev->window == selmon->barwin) {
 510                 i = x = 0;
 511                 do
 512                         x += TEXTW(tags[i]);
 513                 while (ev->x >= x && ++i < LENGTH(tags));
 514                 if (i < LENGTH(tags)) {
 515                         click = ClkTagBar;
 516                         arg.ui = 1 << i;
 517                 } else if (ev->x < x + blw)
 518                         click = ClkLtSymbol;
 519                 else if (ev->x > selmon->ww - (int)TEXTW(stext))
 520                         click = ClkStatusText;
 521                 else
 522                         click = ClkWinTitle;
 523         } else if ((c = wintoclient(ev->window))) {
 524                 focus(c);
 525                 restack(selmon);
 526                 XAllowEvents(dpy, ReplayPointer, CurrentTime);
 527                 click = ClkClientWin;
 528         }
 529         for (i = 0; i < LENGTH(buttons); i++)
 530                 if (click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 531                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 532                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 533 }
 534
 535 void
 536 checkotherwm(void)
 537 {
 538         xerrorxlib = XSetErrorHandler(xerrorstart);
 539         /* this causes an error if some other window manager is running */
 540         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 541         XSync(dpy, False);
 542         XSetErrorHandler(xerror);
 543         XSync(dpy, False);
 544 }
 545
 546 void
 547 cleanup(void)
 548 {
 549         Arg a = {.ui = ~0};
 550         Layout foo = { "", NULL };
 551         Monitor *m;
 552         size_t i;
 553
 554         view(&a);
 555         selmon->lt[selmon->sellt] = &foo;
 556         for (m = mons; m; m = m->next)
 557                 while (m->stack)
 558                         unmanage(m->stack, 0);
 559         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 560         while (mons)
 561                 cleanupmon(mons);
 562         for (i = 0; i < CurLast; i++)
 563                 drw_cur_free(drw, cursor[i]);
 564         for (i = 0; i < LENGTH(colors); i++)
 565                 free(scheme[i]);
 566         free(scheme);
 567         XDestroyWindow(dpy, wmcheckwin);
 568         drw_free(drw);
 569         XSync(dpy, False);
 570         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 571         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 572 }
 573
 574 void
 575 cleanupmon(Monitor *mon)
 576 {
 577         Monitor *m;
 578
 579         if (mon == mons)
 580                 mons = mons->next;
 581         else {
 582                 for (m = mons; m && m->next != mon; m = m->next);
 583                 m->next = mon->next;
 584         }
 585         XUnmapWindow(dpy, mon->barwin);
 586         XDestroyWindow(dpy, mon->barwin);
 587         free(mon);
 588 }
 589
 590 void
 591 clientmessage(XEvent *e)
 592 {
 593         XClientMessageEvent *cme = &e->xclient;
 594         Client *c = wintoclient(cme->window);
 595
 596         if (!c)
 597                 return;
 598         if (cme->message_type == netatom[NetWMState]) {
 599                 if (cme->data.l[1] == netatom[NetWMFullscreen]
 600                 || cme->data.l[2] == netatom[NetWMFullscreen])
 601                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 602                                 || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 603         } else if (cme->message_type == netatom[NetActiveWindow]) {
 604                 if (c != selmon->sel && !c->isurgent)
 605                         seturgent(c, 1);
 606         }
 607 }
 608
 609 void
 610 configure(Client *c)
 611 {
 612         XConfigureEvent ce;
 613
 614         ce.type = ConfigureNotify;
 615         ce.display = dpy;
 616         ce.event = c->win;
 617         ce.window = c->win;
 618         ce.x = c->x;
 619         ce.y = c->y;
 620         ce.width = c->w;
 621         ce.height = c->h;
 622         ce.border_width = c->bw;
 623         ce.above = None;
 624         ce.override_redirect = False;
 625         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 626 }
 627
 628 void
 629 configurenotify(XEvent *e)
 630 {
 631         Monitor *m;
 632         Client *c;
 633         XConfigureEvent *ev = &e->xconfigure;
 634         int dirty;
 635
 636         /* TODO: updategeom handling sucks, needs to be simplified */
 637         if (ev->window == root) {
 638                 dirty = (sw != ev->width || sh != ev->height);
 639                 sw = ev->width;
 640                 sh = ev->height;
 641                 if (updategeom() || dirty) {
 642                         drw_resize(drw, sw, bh);
 643                         updatebars();
 644                         for (m = mons; m; m = m->next) {
 645                                 for (c = m->clients; c; c = c->next)
 646                                         if (c->isfullscreen)
 647                                                 resizeclient(c, m->mx, m->my, m->mw, m->mh);
 648                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 649                         }
 650                         focus(NULL);
 651                         arrange(NULL);
 652                 }
 653         }
 654 }
 655
 656 void
 657 configurerequest(XEvent *e)
 658 {
 659         Client *c;
 660         Monitor *m;
 661         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 662         XWindowChanges wc;
 663
 664         if ((c = wintoclient(ev->window))) {
 665                 if (ev->value_mask & CWBorderWidth)
 666                         c->bw = ev->border_width;
 667                 else if (c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 668                         m = c->mon;
 669                         if (ev->value_mask & CWX) {
 670                                 c->oldx = c->x;
 671                                 c->x = m->mx + ev->x;
 672                         }
 673                         if (ev->value_mask & CWY) {
 674                                 c->oldy = c->y;
 675                                 c->y = m->my + ev->y;
 676                         }
 677                         if (ev->value_mask & CWWidth) {
 678                                 c->oldw = c->w;
 679                                 c->w = ev->width;
 680                         }
 681                         if (ev->value_mask & CWHeight) {
 682                                 c->oldh = c->h;
 683                                 c->h = ev->height;
 684                         }
 685                         if ((c->x + c->w) > m->mx + m->mw && c->isfloating)
 686                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 687                         if ((c->y + c->h) > m->my + m->mh && c->isfloating)
 688                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 689                         if ((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 690                                 configure(c);
 691                         if (ISVISIBLE(c))
 692                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 693                 } else
 694                         configure(c);
 695         } else {
 696                 wc.x = ev->x;
 697                 wc.y = ev->y;
 698                 wc.width = ev->width;
 699                 wc.height = ev->height;
 700                 wc.border_width = ev->border_width;
 701                 wc.sibling = ev->above;
 702                 wc.stack_mode = ev->detail;
 703                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 704         }
 705         XSync(dpy, False);
 706 }
 707
 708 Monitor *
 709 createmon(void)
 710 {
 711         Monitor *m;
 712
 713         m = ecalloc(1, sizeof(Monitor));
 714         m->tagset[0] = m->tagset[1] = 1;
 715         m->mfact = mfact;
 716         m->nmaster = nmaster;
 717         m->showbar = showbar;
 718         m->topbar = topbar;
 719         m->lt[0] = &layouts[0];
 720         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 721         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 722         return m;
 723 }
 724
 725 void
 726 destroynotify(XEvent *e)
 727 {
 728         Client *c;
 729         XDestroyWindowEvent *ev = &e->xdestroywindow;
 730
 731         if ((c = wintoclient(ev->window)))
 732                 unmanage(c, 1);
 733
 734         else if ((c = swallowingclient(ev->window)))
 735                 unmanage(c->swallowing, 1);
 736 }
 737
 738 void
 739 detach(Client *c)
 740 {
 741         Client **tc;
 742
 743         for (tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 744         *tc = c->next;
 745 }
 746
 747 void
 748 detachstack(Client *c)
 749 {
 750         Client **tc, *t;
 751
 752         for (tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 753         *tc = c->snext;
 754
 755         if (c == c->mon->sel) {
 756                 for (t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 757                 c->mon->sel = t;
 758         }
 759 }
 760
 761 Monitor *
 762 dirtomon(int dir)
 763 {
 764         Monitor *m = NULL;
 765
 766         if (dir > 0) {
 767                 if (!(m = selmon->next))
 768                         m = mons;
 769         } else if (selmon == mons)
 770                 for (m = mons; m->next; m = m->next);
 771         else
 772                 for (m = mons; m->next != selmon; m = m->next);
 773         return m;
 774 }
 775
 776 void
 777 drawbar(Monitor *m)
 778 {
 779         int x, w, tw = 0;
 780         int boxs = drw->fonts->h / 9;
 781         int boxw = drw->fonts->h / 6 + 2;
 782         unsigned int i, occ = 0, urg = 0;
 783         Client *c;
 784
 785         if (!m->showbar)
 786                 return;
 787
 788         /* draw status first so it can be overdrawn by tags later */
 789         if (m == selmon) { /* status is only drawn on selected monitor */
 790                 drw_setscheme(drw, scheme[SchemeNorm]);
 791                 tw = TEXTW(stext) - lrpad + 2; /* 2px right padding */
 792                 drw_text(drw, m->ww - tw, 0, tw, bh, 0, stext, 0);
 793         }
 794
 795         for (c = m->clients; c; c = c->next) {
 796                 occ |= c->tags;
 797                 if (c->isurgent)
 798                         urg |= c->tags;
 799         }
 800         x = 0;
 801         for (i = 0; i < LENGTH(tags); i++) {
 802                 w = TEXTW(tags[i]);
 803                 drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 804                 drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
 805                 if (occ & 1 << i)
 806                         drw_rect(drw, x + boxs, boxs, boxw, boxw,
 807                                 m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 808                                 urg & 1 << i);
 809                 x += w;
 810         }
 811         w = blw = TEXTW(m->ltsymbol);
 812         drw_setscheme(drw, scheme[SchemeNorm]);
 813         x = drw_text(drw, x, 0, w, bh, lrpad / 2, m->ltsymbol, 0);
 814
 815         if ((w = m->ww - tw - x) > bh) {
 816                 if (m->sel) {
 817                         drw_setscheme(drw, scheme[m == selmon ? SchemeSel : SchemeNorm]);
 818                         drw_text(drw, x, 0, w, bh, lrpad / 2, m->sel->name, 0);
 819                         if (m->sel->isfloating)
 820                                 drw_rect(drw, x + boxs, boxs, boxw, boxw, m->sel->isfixed, 0);
 821                 } else {
 822                         drw_setscheme(drw, scheme[SchemeNorm]);
 823                         drw_rect(drw, x, 0, w, bh, 1, 1);
 824                 }
 825         }
 826         drw_map(drw, m->barwin, 0, 0, m->ww, bh);
 827 }
 828
 829 void
 830 drawbars(void)
 831 {
 832         Monitor *m;
 833
 834         for (m = mons; m; m = m->next)
 835                 drawbar(m);
 836 }
 837
 838 void
 839 enternotify(XEvent *e)
 840 {
 841         Client *c;
 842         Monitor *m;
 843         XCrossingEvent *ev = &e->xcrossing;
 844
 845         if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 846                 return;
 847         c = wintoclient(ev->window);
 848         m = c ? c->mon : wintomon(ev->window);
 849         if (m != selmon) {
 850                 unfocus(selmon->sel, 1);
 851                 selmon = m;
 852         } else if (!c || c == selmon->sel)
 853                 return;
 854         focus(c);
 855 }
 856
 857 void
 858 expose(XEvent *e)
 859 {
 860         Monitor *m;
 861         XExposeEvent *ev = &e->xexpose;
 862
 863         if (ev->count == 0 && (m = wintomon(ev->window)))
 864                 drawbar(m);
 865 }
 866
 867 void
 868 focus(Client *c)
 869 {
 870         if (!c || !ISVISIBLE(c))
 871                 for (c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 872         if (selmon->sel && selmon->sel != c)
 873                 unfocus(selmon->sel, 0);
 874         if (c) {
 875                 if (c->mon != selmon)
 876                         selmon = c->mon;
 877                 if (c->isurgent)
 878                         seturgent(c, 0);
 879                 detachstack(c);
 880                 attachstack(c);
 881                 grabbuttons(c, 1);
 882                 XSetWindowBorder(dpy, c->win, scheme[SchemeSel][ColBorder].pixel);
 883                 setfocus(c);
 884         } else {
 885                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 886                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 887         }
 888         selmon->sel = c;
 889         drawbars();
 890 }
 891
 892 /* there are some broken focus acquiring clients needing extra handling */
 893 void
 894 focusin(XEvent *e)
 895 {
 896         XFocusChangeEvent *ev = &e->xfocus;
 897
 898         if (selmon->sel && ev->window != selmon->sel->win)
 899                 setfocus(selmon->sel);
 900 }
 901
 902 void
 903 focusmon(const Arg *arg)
 904 {
 905         Monitor *m;
 906
 907         if (!mons->next)
 908                 return;
 909         if ((m = dirtomon(arg->i)) == selmon)
 910                 return;
 911         unfocus(selmon->sel, 0);
 912         selmon = m;
 913         focus(NULL);
 914 }
 915
 916 void
 917 focusstack(const Arg *arg)
 918 {
 919         Client *c = NULL, *i;
 920
 921         if (!selmon->sel || (selmon->sel->isfullscreen && lockfullscreen))
 922                 return;
 923         if (arg->i > 0) {
 924                 for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 925                 if (!c)
 926                         for (c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 927         } else {
 928                 for (i = selmon->clients; i != selmon->sel; i = i->next)
 929                         if (ISVISIBLE(i))
 930                                 c = i;
 931                 if (!c)
 932                         for (; i; i = i->next)
 933                                 if (ISVISIBLE(i))
 934                                         c = i;
 935         }
 936         if (c) {
 937                 focus(c);
 938                 restack(selmon);
 939         }
 940 }
 941
 942 Atom
 943 getatomprop(Client *c, Atom prop)
 944 {
 945         int di;
 946         unsigned long dl;
 947         unsigned char *p = NULL;
 948         Atom da, atom = None;
 949
 950         if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 951                 &da, &di, &dl, &dl, &p) == Success && p) {
 952                 atom = *(Atom *)p;
 953                 XFree(p);
 954         }
 955         return atom;
 956 }
 957
 958 int
 959 getrootptr(int *x, int *y)
 960 {
 961         int di;
 962         unsigned int dui;
 963         Window dummy;
 964
 965         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 966 }
 967
 968 long
 969 getstate(Window w)
 970 {
 971         int format;
 972         long result = -1;
 973         unsigned char *p = NULL;
 974         unsigned long n, extra;
 975         Atom real;
 976
 977         if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 978                 &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 979                 return -1;
 980         if (n != 0)
 981                 result = *p;
 982         XFree(p);
 983         return result;
 984 }
 985
 986 int
 987 gettextprop(Window w, Atom atom, char *text, unsigned int size)
 988 {
 989         char **list = NULL;
 990         int n;
 991         XTextProperty name;
 992
 993         if (!text || size == 0)
 994                 return 0;
 995         text[0] = '\0';
 996         if (!XGetTextProperty(dpy, w, &name, atom) || !name.nitems)
 997                 return 0;
 998         if (name.encoding == XA_STRING)
 999                 strncpy(text, (char *)name.value, size - 1);
1000         else {
1001                 if (XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
1002                         strncpy(text, *list, size - 1);
1003                         XFreeStringList(list);
1004                 }
1005         }
1006         text[size - 1] = '\0';
1007         XFree(name.value);
1008         return 1;
1009 }
1010
1011 void
1012 grabbuttons(Client *c, int focused)
1013 {
1014         updatenumlockmask();
1015         {
1016                 unsigned int i, j;
1017                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1018                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1019                 if (!focused)
1020                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1021                                 BUTTONMASK, GrabModeSync, GrabModeSync, None, None);
1022                 for (i = 0; i < LENGTH(buttons); i++)
1023                         if (buttons[i].click == ClkClientWin)
1024                                 for (j = 0; j < LENGTH(modifiers); j++)
1025                                         XGrabButton(dpy, buttons[i].button,
1026                                                 buttons[i].mask | modifiers[j],
1027                                                 c->win, False, BUTTONMASK,
1028                                                 GrabModeAsync, GrabModeSync, None, None);
1029         }
1030 }
1031
1032 void
1033 grabkeys(void)
1034 {
1035         updatenumlockmask();
1036         {
1037                 unsigned int i, j;
1038                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1039                 KeyCode code;
1040
1041                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1042                 for (i = 0; i < LENGTH(keys); i++)
1043                         if ((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1044                                 for (j = 0; j < LENGTH(modifiers); j++)
1045                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1046                                                 True, GrabModeAsync, GrabModeAsync);
1047         }
1048 }
1049
1050 void
1051 incnmaster(const Arg *arg)
1052 {
1053         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1054         arrange(selmon);
1055 }
1056
1057 #ifdef XINERAMA
1058 static int
1059 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info)
1060 {
1061         while (n--)
1062                 if (unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1063                 && unique[n].width == info->width && unique[n].height == info->height)
1064                         return 0;
1065         return 1;
1066 }
1067 #endif /* XINERAMA */
1068
1069 void
1070 keypress(XEvent *e)
1071 {
1072         unsigned int i;
1073         KeySym keysym;
1074         XKeyEvent *ev;
1075
1076         ev = &e->xkey;
1077         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1078         for (i = 0; i < LENGTH(keys); i++)
1079                 if (keysym == keys[i].keysym
1080                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1081                 && keys[i].func)
1082                         keys[i].func(&(keys[i].arg));
1083 }
1084
1085 void
1086 killclient(const Arg *arg)
1087 {
1088         if (!selmon->sel)
1089                 return;
1090         if (!sendevent(selmon->sel, wmatom[WMDelete])) {
1091                 XGrabServer(dpy);
1092                 XSetErrorHandler(xerrordummy);
1093                 XSetCloseDownMode(dpy, DestroyAll);
1094                 XKillClient(dpy, selmon->sel->win);
1095                 XSync(dpy, False);
1096                 XSetErrorHandler(xerror);
1097                 XUngrabServer(dpy);
1098         }
1099 }
1100
1101 void
1102 manage(Window w, XWindowAttributes *wa)
1103 {
1104         Client *c, *t = NULL, *term = NULL;
1105         Window trans = None;
1106         XWindowChanges wc;
1107
1108         c = ecalloc(1, sizeof(Client));
1109         c->win = w;
1110         c->pid = winpid(w);
1111         /* geometry */
1112         c->x = c->oldx = wa->x;
1113         c->y = c->oldy = wa->y;
1114         c->w = c->oldw = wa->width;
1115         c->h = c->oldh = wa->height;
1116         c->oldbw = wa->border_width;
1117
1118         updatetitle(c);
1119         if (XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1120                 c->mon = t->mon;
1121                 c->tags = t->tags;
1122         } else {
1123                 c->mon = selmon;
1124                 applyrules(c);
1125                 term = termforwin(c);
1126         }
1127
1128         if (c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1129                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1130         if (c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1131                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1132         c->x = MAX(c->x, c->mon->mx);
1133         /* only fix client y-offset, if the client center might cover the bar */
1134         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1135                 && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1136         c->bw = borderpx;
1137
1138         wc.border_width = c->bw;
1139         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1140         XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
1141         configure(c); /* propagates border_width, if size doesn't change */
1142         updatewindowtype(c);
1143         updatesizehints(c);
1144         updatewmhints(c);
1145         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1146         grabbuttons(c, 0);
1147         if (!c->isfloating)
1148                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1149         if (c->isfloating)
1150                 XRaiseWindow(dpy, c->win);
1151         attach(c);
1152         attachstack(c);
1153         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1154                 (unsigned char *) &(c->win), 1);
1155         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1156         setclientstate(c, NormalState);
1157         if (c->mon == selmon)
1158                 unfocus(selmon->sel, 0);
1159         c->mon->sel = c;
1160         arrange(c->mon);
1161         XMapWindow(dpy, c->win);
1162         if (term)
1163                 swallow(term, c);
1164         focus(NULL);
1165 }
1166
1167 void
1168 mappingnotify(XEvent *e)
1169 {
1170         XMappingEvent *ev = &e->xmapping;
1171
1172         XRefreshKeyboardMapping(ev);
1173         if (ev->request == MappingKeyboard)
1174                 grabkeys();
1175 }
1176
1177 void
1178 maprequest(XEvent *e)
1179 {
1180         static XWindowAttributes wa;
1181         XMapRequestEvent *ev = &e->xmaprequest;
1182
1183         if (!XGetWindowAttributes(dpy, ev->window, &wa))
1184                 return;
1185         if (wa.override_redirect)
1186                 return;
1187         if (!wintoclient(ev->window))
1188                 manage(ev->window, &wa);
1189 }
1190
1191 void
1192 monocle(Monitor *m)
1193 {
1194         unsigned int n = 0;
1195         Client *c;
1196
1197         for (c = m->clients; c; c = c->next)
1198                 if (ISVISIBLE(c))
1199                         n++;
1200         if (n > 0) /* override layout symbol */
1201                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1202         for (c = nexttiled(m->clients); c; c = nexttiled(c->next))
1203                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, 0);
1204 }
1205
1206 void
1207 motionnotify(XEvent *e)
1208 {
1209         static Monitor *mon = NULL;
1210         Monitor *m;
1211         XMotionEvent *ev = &e->xmotion;
1212
1213         if (ev->window != root)
1214                 return;
1215         if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1216                 unfocus(selmon->sel, 1);
1217                 selmon = m;
1218                 focus(NULL);
1219         }
1220         mon = m;
1221 }
1222
1223 void
1224 movemouse(const Arg *arg)
1225 {
1226         int x, y, ocx, ocy, nx, ny;
1227         Client *c;
1228         Monitor *m;
1229         XEvent ev;
1230         Time lasttime = 0;
1231
1232         if (!(c = selmon->sel))
1233                 return;
1234         if (c->isfullscreen) /* no support moving fullscreen windows by mouse */
1235                 return;
1236         restack(selmon);
1237         ocx = c->x;
1238         ocy = c->y;
1239         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1240                 None, cursor[CurMove]->cursor, CurrentTime) != GrabSuccess)
1241                 return;
1242         if (!getrootptr(&x, &y))
1243                 return;
1244         do {
1245                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1246                 switch(ev.type) {
1247                 case ConfigureRequest:
1248                 case Expose:
1249                 case MapRequest:
1250                         handler[ev.type](&ev);
1251                         break;
1252                 case MotionNotify:
1253                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1254                                 continue;
1255                         lasttime = ev.xmotion.time;
1256
1257                         nx = ocx + (ev.xmotion.x - x);
1258                         ny = ocy + (ev.xmotion.y - y);
1259                         if (abs(selmon->wx - nx) < snap)
1260                                 nx = selmon->wx;
1261                         else if (abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1262                                 nx = selmon->wx + selmon->ww - WIDTH(c);
1263                         if (abs(selmon->wy - ny) < snap)
1264                                 ny = selmon->wy;
1265                         else if (abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1266                                 ny = selmon->wy + selmon->wh - HEIGHT(c);
1267                         if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1268                         && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1269                                 togglefloating(NULL);
1270                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1271                                 resize(c, nx, ny, c->w, c->h, 1);
1272                         break;
1273                 }
1274         } while (ev.type != ButtonRelease);
1275         XUngrabPointer(dpy, CurrentTime);
1276         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1277                 sendmon(c, m);
1278                 selmon = m;
1279                 focus(NULL);
1280         }
1281 }
1282
1283 Client *
1284 nexttiled(Client *c)
1285 {
1286         for (; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1287         return c;
1288 }
1289
1290 void
1291 pop(Client *c)
1292 {
1293         detach(c);
1294         attach(c);
1295         focus(c);
1296         arrange(c->mon);
1297 }
1298
1299 void
1300 propertynotify(XEvent *e)
1301 {
1302         Client *c;
1303         Window trans;
1304         XPropertyEvent *ev = &e->xproperty;
1305
1306         if ((ev->window == root) && (ev->atom == XA_WM_NAME))
1307                 updatestatus();
1308         else if (ev->state == PropertyDelete)
1309                 return; /* ignore */
1310         else if ((c = wintoclient(ev->window))) {
1311                 switch(ev->atom) {
1312                 default: break;
1313                 case XA_WM_TRANSIENT_FOR:
1314                         if (!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1315                                 (c->isfloating = (wintoclient(trans)) != NULL))
1316                                 arrange(c->mon);
1317                         break;
1318                 case XA_WM_NORMAL_HINTS:
1319                         updatesizehints(c);
1320                         break;
1321                 case XA_WM_HINTS:
1322                         updatewmhints(c);
1323                         drawbars();
1324                         break;
1325                 }
1326                 if (ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1327                         updatetitle(c);
1328                         if (c == c->mon->sel)
1329                                 drawbar(c->mon);
1330                 }
1331                 if (ev->atom == netatom[NetWMWindowType])
1332                         updatewindowtype(c);
1333         }
1334 }
1335
1336 void
1337 quit(const Arg *arg)
1338 {
1339         running = 0;
1340 }
1341
1342 Monitor *
1343 recttomon(int x, int y, int w, int h)
1344 {
1345         Monitor *m, *r = selmon;
1346         int a, area = 0;
1347
1348         for (m = mons; m; m = m->next)
1349                 if ((a = INTERSECT(x, y, w, h, m)) > area) {
1350                         area = a;
1351                         r = m;
1352                 }
1353         return r;
1354 }
1355
1356 void
1357 resize(Client *c, int x, int y, int w, int h, int interact)
1358 {
1359         if (applysizehints(c, &x, &y, &w, &h, interact))
1360                 resizeclient(c, x, y, w, h);
1361 }
1362
1363 void
1364 resizeclient(Client *c, int x, int y, int w, int h)
1365 {
1366         XWindowChanges wc;
1367
1368         c->oldx = c->x; c->x = wc.x = x;
1369         c->oldy = c->y; c->y = wc.y = y;
1370         c->oldw = c->w; c->w = wc.width = w;
1371         c->oldh = c->h; c->h = wc.height = h;
1372         wc.border_width = c->bw;
1373         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1374         configure(c);
1375         XSync(dpy, False);
1376 }
1377
1378 void
1379 resizemouse(const Arg *arg)
1380 {
1381         int ocx, ocy, nw, nh;
1382         Client *c;
1383         Monitor *m;
1384         XEvent ev;
1385         Time lasttime = 0;
1386
1387         if (!(c = selmon->sel))
1388                 return;
1389         if (c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1390                 return;
1391         restack(selmon);
1392         ocx = c->x;
1393         ocy = c->y;
1394         if (XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1395                 None, cursor[CurResize]->cursor, CurrentTime) != GrabSuccess)
1396                 return;
1397         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1398         do {
1399                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1400                 switch(ev.type) {
1401                 case ConfigureRequest:
1402                 case Expose:
1403                 case MapRequest:
1404                         handler[ev.type](&ev);
1405                         break;
1406                 case MotionNotify:
1407                         if ((ev.xmotion.time - lasttime) <= (1000 / 60))
1408                                 continue;
1409                         lasttime = ev.xmotion.time;
1410
1411                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1412                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1413                         if (c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1414                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1415                         {
1416                                 if (!c->isfloating && selmon->lt[selmon->sellt]->arrange
1417                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1418                                         togglefloating(NULL);
1419                         }
1420                         if (!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1421                                 resize(c, c->x, c->y, nw, nh, 1);
1422                         break;
1423                 }
1424         } while (ev.type != ButtonRelease);
1425         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1426         XUngrabPointer(dpy, CurrentTime);
1427         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1428         if ((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1429                 sendmon(c, m);
1430                 selmon = m;
1431                 focus(NULL);
1432         }
1433 }
1434
1435 void
1436 restack(Monitor *m)
1437 {
1438         Client *c;
1439         XEvent ev;
1440         XWindowChanges wc;
1441
1442         drawbar(m);
1443         if (!m->sel)
1444                 return;
1445         if (m->sel->isfloating || !m->lt[m->sellt]->arrange)
1446                 XRaiseWindow(dpy, m->sel->win);
1447         if (m->lt[m->sellt]->arrange) {
1448                 wc.stack_mode = Below;
1449                 wc.sibling = m->barwin;
1450                 for (c = m->stack; c; c = c->snext)
1451                         if (!c->isfloating && ISVISIBLE(c)) {
1452                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1453                                 wc.sibling = c->win;
1454                         }
1455         }
1456         XSync(dpy, False);
1457         while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1458 }
1459
1460 void
1461 run(void)
1462 {
1463         XEvent ev;
1464         /* main event loop */
1465         XSync(dpy, False);
1466         while (running && !XNextEvent(dpy, &ev))
1467                 if (handler[ev.type])
1468                         handler[ev.type](&ev); /* call handler */
1469 }
1470
1471 void
1472 scan(void)
1473 {
1474         unsigned int i, num;
1475         Window d1, d2, *wins = NULL;
1476         XWindowAttributes wa;
1477
1478         if (XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1479                 for (i = 0; i < num; i++) {
1480                         if (!XGetWindowAttributes(dpy, wins[i], &wa)
1481                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1482                                 continue;
1483                         if (wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1484                                 manage(wins[i], &wa);
1485                 }
1486                 for (i = 0; i < num; i++) { /* now the transients */
1487                         if (!XGetWindowAttributes(dpy, wins[i], &wa))
1488                                 continue;
1489                         if (XGetTransientForHint(dpy, wins[i], &d1)
1490                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1491                                 manage(wins[i], &wa);
1492                 }
1493                 if (wins)
1494                         XFree(wins);
1495         }
1496 }
1497
1498 void
1499 sendmon(Client *c, Monitor *m)
1500 {
1501         if (c->mon == m)
1502                 return;
1503         unfocus(c, 1);
1504         detach(c);
1505         detachstack(c);
1506         c->mon = m;
1507         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1508         attach(c);
1509         attachstack(c);
1510         focus(NULL);
1511         arrange(NULL);
1512 }
1513
1514 void
1515 setclientstate(Client *c, long state)
1516 {
1517         long data[] = { state, None };
1518
1519         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1520                 PropModeReplace, (unsigned char *)data, 2);
1521 }
1522
1523 int
1524 sendevent(Client *c, Atom proto)
1525 {
1526         int n;
1527         Atom *protocols;
1528         int exists = 0;
1529         XEvent ev;
1530
1531         if (XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1532                 while (!exists && n--)
1533                         exists = protocols[n] == proto;
1534                 XFree(protocols);
1535         }
1536         if (exists) {
1537                 ev.type = ClientMessage;
1538                 ev.xclient.window = c->win;
1539                 ev.xclient.message_type = wmatom[WMProtocols];
1540                 ev.xclient.format = 32;
1541                 ev.xclient.data.l[0] = proto;
1542                 ev.xclient.data.l[1] = CurrentTime;
1543                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1544         }
1545         return exists;
1546 }
1547
1548 void
1549 setfocus(Client *c)
1550 {
1551         if (!c->neverfocus) {
1552                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1553                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1554                         XA_WINDOW, 32, PropModeReplace,
1555                         (unsigned char *) &(c->win), 1);
1556         }
1557         sendevent(c, wmatom[WMTakeFocus]);
1558 }
1559
1560 void
1561 setfullscreen(Client *c, int fullscreen)
1562 {
1563         if (fullscreen && !c->isfullscreen) {
1564                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1565                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1566                 c->isfullscreen = 1;
1567                 c->oldstate = c->isfloating;
1568                 c->oldbw = c->bw;
1569                 c->bw = 0;
1570                 c->isfloating = 1;
1571                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1572                 XRaiseWindow(dpy, c->win);
1573         } else if (!fullscreen && c->isfullscreen){
1574                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1575                         PropModeReplace, (unsigned char*)0, 0);
1576                 c->isfullscreen = 0;
1577                 c->isfloating = c->oldstate;
1578                 c->bw = c->oldbw;
1579                 c->x = c->oldx;
1580                 c->y = c->oldy;
1581                 c->w = c->oldw;
1582                 c->h = c->oldh;
1583                 resizeclient(c, c->x, c->y, c->w, c->h);
1584                 arrange(c->mon);
1585         }
1586 }
1587
1588 Layout *last_layout;
1589 void
1590 fullscreen(const Arg *arg)
1591 {
1592         if (selmon->showbar) {
1593                 for(last_layout = (Layout *)layouts; last_layout != selmon->lt[selmon->sellt]; last_layout++);
1594                 setlayout(&((Arg) { .v = &layouts[2] }));
1595         } else {
1596                 setlayout(&((Arg) { .v = last_layout }));
1597         }
1598         togglebar(arg);
1599 }
1600
1601 void
1602 setlayout(const Arg *arg)
1603 {
1604         if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1605                 selmon->sellt ^= 1;
1606         if (arg && arg->v)
1607                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1608         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1609         if (selmon->sel)
1610                 arrange(selmon);
1611         else
1612                 drawbar(selmon);
1613 }
1614
1615 /* arg > 1.0 will set mfact absolutely */
1616 void
1617 setmfact(const Arg *arg)
1618 {
1619         float f;
1620
1621         if (!arg || !selmon->lt[selmon->sellt]->arrange)
1622                 return;
1623         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1624         if (f < 0.05 || f > 0.95)
1625                 return;
1626         selmon->mfact = f;
1627         arrange(selmon);
1628 }
1629
1630 void
1631 setup(void)
1632 {
1633         int i;
1634         XSetWindowAttributes wa;
1635         Atom utf8string;
1636
1637         /* clean up any zombies immediately */
1638         sigchld(0);
1639
1640         /* init screen */
1641         screen = DefaultScreen(dpy);
1642         sw = DisplayWidth(dpy, screen);
1643         sh = DisplayHeight(dpy, screen);
1644         root = RootWindow(dpy, screen);
1645         xinitvisual();
1646         drw = drw_create(dpy, screen, root, sw, sh, visual, depth, cmap);
1647         if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
1648                 die("no fonts could be loaded.");
1649         lrpad = drw->fonts->h;
1650         bh = drw->fonts->h + 2;
1651         updategeom();
1652         /* init atoms */
1653         utf8string = XInternAtom(dpy, "UTF8_STRING", False);
1654         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1655         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1656         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1657         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1658         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1659         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1660         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1661         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1662         netatom[NetWMCheck] = XInternAtom(dpy, "_NET_SUPPORTING_WM_CHECK", False);
1663         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1664         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1665         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1666         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1667         /* init cursors */
1668         cursor[CurNormal] = drw_cur_create(drw, XC_left_ptr);
1669         cursor[CurResize] = drw_cur_create(drw, XC_sizing);
1670         cursor[CurMove] = drw_cur_create(drw, XC_fleur);
1671         /* init appearance */
1672         scheme = ecalloc(LENGTH(colors), sizeof(Clr *));
1673         for (i = 0; i < LENGTH(colors); i++)
1674                 scheme[i] = drw_scm_create(drw, colors[i], alphas[i], 3);
1675         /* init bars */
1676         updatebars();
1677         updatestatus();
1678         /* supporting window for NetWMCheck */
1679         wmcheckwin = XCreateSimpleWindow(dpy, root, 0, 0, 1, 1, 0, 0, 0);
1680         XChangeProperty(dpy, wmcheckwin, netatom[NetWMCheck], XA_WINDOW, 32,
1681                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1682         XChangeProperty(dpy, wmcheckwin, netatom[NetWMName], utf8string, 8,
1683                 PropModeReplace, (unsigned char *) "dwm", 3);
1684         XChangeProperty(dpy, root, netatom[NetWMCheck], XA_WINDOW, 32,
1685                 PropModeReplace, (unsigned char *) &wmcheckwin, 1);
1686         /* EWMH support per view */
1687         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1688                 PropModeReplace, (unsigned char *) netatom, NetLast);
1689         XDeleteProperty(dpy, root, netatom[NetClientList]);
1690         /* select events */
1691         wa.cursor = cursor[CurNormal]->cursor;
1692         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask
1693                 |ButtonPressMask|PointerMotionMask|EnterWindowMask
1694                 |LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1695         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1696         XSelectInput(dpy, root, wa.event_mask);
1697         grabkeys();
1698         focus(NULL);
1699 }
1700
1701
1702 void
1703 seturgent(Client *c, int urg)
1704 {
1705         XWMHints *wmh;
1706
1707         c->isurgent = urg;
1708         if (!(wmh = XGetWMHints(dpy, c->win)))
1709                 return;
1710         wmh->flags = urg ? (wmh->flags | XUrgencyHint) : (wmh->flags & ~XUrgencyHint);
1711         XSetWMHints(dpy, c->win, wmh);
1712         XFree(wmh);
1713 }
1714
1715 void
1716 showhide(Client *c)
1717 {
1718         if (!c)
1719                 return;
1720         if (ISVISIBLE(c)) {
1721                 /* show clients top down */
1722                 XMoveWindow(dpy, c->win, c->x, c->y);
1723                 if ((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1724                         resize(c, c->x, c->y, c->w, c->h, 0);
1725                 showhide(c->snext);
1726         } else {
1727                 /* hide clients bottom up */
1728                 showhide(c->snext);
1729                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1730         }
1731 }
1732
1733 void
1734 sigchld(int unused)
1735 {
1736         if (signal(SIGCHLD, sigchld) == SIG_ERR)
1737                 die("can't install SIGCHLD handler:");
1738         while (0 < waitpid(-1, NULL, WNOHANG));
1739 }
1740
1741 void
1742 spawn(const Arg *arg)
1743 {
1744         if (arg->v == dmenucmd)
1745                 dmenumon[0] = '0' + selmon->num;
1746         if (fork() == 0) {
1747                 if (dpy)
1748                         close(ConnectionNumber(dpy));
1749                 setsid();
1750                 execvp(((char **)arg->v)[0], (char **)arg->v);
1751                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1752                 perror(" failed");
1753                 exit(EXIT_SUCCESS);
1754         }
1755 }
1756
1757 void
1758 tag(const Arg *arg)
1759 {
1760         if (selmon->sel && arg->ui & TAGMASK) {
1761                 selmon->sel->tags = arg->ui & TAGMASK;
1762                 focus(NULL);
1763                 arrange(selmon);
1764         }
1765 }
1766
1767 void
1768 tagmon(const Arg *arg)
1769 {
1770         if (!selmon->sel || !mons->next)
1771                 return;
1772         sendmon(selmon->sel, dirtomon(arg->i));
1773 }
1774
1775 void
1776 tile(Monitor *m)
1777 {
1778         unsigned int i, n, h, mw, my, ty;
1779         Client *c;
1780
1781         for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1782         if (n == 0)
1783                 return;
1784
1785         if (n > m->nmaster)
1786                 mw = m->nmaster ? m->ww * m->mfact : 0;
1787         else
1788                 mw = m->ww;
1789         for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1790                 if (i < m->nmaster) {
1791                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1792                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
1793                         if (my + HEIGHT(c) < m->wh)
1794                                 my += HEIGHT(c);
1795                 } else {
1796                         h = (m->wh - ty) / (n - i);
1797                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
1798                         if (ty + HEIGHT(c) < m->wh)
1799                                 ty += HEIGHT(c);
1800                 }
1801 }
1802
1803 void
1804 togglebar(const Arg *arg)
1805 {
1806         selmon->showbar = !selmon->showbar;
1807         updatebarpos(selmon);
1808         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1809         arrange(selmon);
1810 }
1811
1812 void
1813 togglefloating(const Arg *arg)
1814 {
1815         if (!selmon->sel)
1816                 return;
1817         if (selmon->sel->isfullscreen) /* no support for fullscreen windows */
1818                 return;
1819         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1820         if (selmon->sel->isfloating)
1821                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1822                         selmon->sel->w, selmon->sel->h, 0);
1823         arrange(selmon);
1824 }
1825
1826 void
1827 toggletag(const Arg *arg)
1828 {
1829         unsigned int newtags;
1830
1831         if (!selmon->sel)
1832                 return;
1833         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1834         if (newtags) {
1835                 selmon->sel->tags = newtags;
1836                 focus(NULL);
1837                 arrange(selmon);
1838         }
1839 }
1840
1841 void
1842 toggleview(const Arg *arg)
1843 {
1844         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1845
1846         if (newtagset) {
1847                 selmon->tagset[selmon->seltags] = newtagset;
1848                 focus(NULL);
1849                 arrange(selmon);
1850         }
1851 }
1852
1853 void
1854 unfocus(Client *c, int setfocus)
1855 {
1856         if (!c)
1857                 return;
1858         grabbuttons(c, 0);
1859         XSetWindowBorder(dpy, c->win, scheme[SchemeNorm][ColBorder].pixel);
1860         if (setfocus) {
1861                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1862                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1863         }
1864 }
1865
1866 void
1867 unmanage(Client *c, int destroyed)
1868 {
1869         Monitor *m = c->mon;
1870         XWindowChanges wc;
1871
1872         if (c->swallowing) {
1873                 unswallow(c);
1874                 return;
1875         }
1876
1877         Client *s = swallowingclient(c->win);
1878         if (s) {
1879                 free(s->swallowing);
1880                 s->swallowing = NULL;
1881                 arrange(m);
1882                 focus(NULL);
1883                 return;
1884         }
1885
1886         detach(c);
1887         detachstack(c);
1888         if (!destroyed) {
1889                 wc.border_width = c->oldbw;
1890                 XGrabServer(dpy); /* avoid race conditions */
1891                 XSetErrorHandler(xerrordummy);
1892                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1893                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1894                 setclientstate(c, WithdrawnState);
1895                 XSync(dpy, False);
1896                 XSetErrorHandler(xerror);
1897                 XUngrabServer(dpy);
1898         }
1899         free(c);
1900
1901         if (!s) {
1902                 arrange(m);
1903                 focus(NULL);
1904                 updateclientlist();
1905         }
1906 }
1907
1908 void
1909 unmapnotify(XEvent *e)
1910 {
1911         Client *c;
1912         XUnmapEvent *ev = &e->xunmap;
1913
1914         if ((c = wintoclient(ev->window))) {
1915                 if (ev->send_event)
1916                         setclientstate(c, WithdrawnState);
1917                 else
1918                         unmanage(c, 0);
1919         }
1920 }
1921
1922 void
1923 updatebars(void)
1924 {
1925         Monitor *m;
1926         XSetWindowAttributes wa = {
1927                 .override_redirect = True,
1928                 .background_pixel = 0,
1929                 .border_pixel = 0,
1930                 .colormap = cmap,
1931                 .event_mask = ButtonPressMask|ExposureMask
1932         };
1933         XClassHint ch = {"dwm", "dwm"};
1934         for (m = mons; m; m = m->next) {
1935                 if (m->barwin)
1936                         continue;
1937                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, depth,
1938                                           InputOutput, visual,
1939                                           CWOverrideRedirect|CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &wa);
1940                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]->cursor);
1941                 XMapRaised(dpy, m->barwin);
1942                 XSetClassHint(dpy, m->barwin, &ch);
1943         }
1944 }
1945
1946 void
1947 updatebarpos(Monitor *m)
1948 {
1949         m->wy = m->my;
1950         m->wh = m->mh;
1951         if (m->showbar) {
1952                 m->wh -= bh;
1953                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1954                 m->wy = m->topbar ? m->wy + bh : m->wy;
1955         } else
1956                 m->by = -bh;
1957 }
1958
1959 void
1960 updateclientlist()
1961 {
1962         Client *c;
1963         Monitor *m;
1964
1965         XDeleteProperty(dpy, root, netatom[NetClientList]);
1966         for (m = mons; m; m = m->next)
1967                 for (c = m->clients; c; c = c->next)
1968                         XChangeProperty(dpy, root, netatom[NetClientList],
1969                                 XA_WINDOW, 32, PropModeAppend,
1970                                 (unsigned char *) &(c->win), 1);
1971 }
1972
1973 int
1974 updategeom(void)
1975 {
1976         int dirty = 0;
1977
1978 #ifdef XINERAMA
1979         if (XineramaIsActive(dpy)) {
1980                 int i, j, n, nn;
1981                 Client *c;
1982                 Monitor *m;
1983                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1984                 XineramaScreenInfo *unique = NULL;
1985
1986                 for (n = 0, m = mons; m; m = m->next, n++);
1987                 /* only consider unique geometries as separate screens */
1988                 unique = ecalloc(nn, sizeof(XineramaScreenInfo));
1989                 for (i = 0, j = 0; i < nn; i++)
1990                         if (isuniquegeom(unique, j, &info[i]))
1991                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1992                 XFree(info);
1993                 nn = j;
1994                 if (n <= nn) { /* new monitors available */
1995                         for (i = 0; i < (nn - n); i++) {
1996                                 for (m = mons; m && m->next; m = m->next);
1997                                 if (m)
1998                                         m->next = createmon();
1999                                 else
2000                                         mons = createmon();
2001                         }
2002                         for (i = 0, m = mons; i < nn && m; m = m->next, i++)
2003                                 if (i >= n
2004                                 || unique[i].x_org != m->mx || unique[i].y_org != m->my
2005                                 || unique[i].width != m->mw || unique[i].height != m->mh)
2006                                 {
2007                                         dirty = 1;
2008                                         m->num = i;
2009                                         m->mx = m->wx = unique[i].x_org;
2010                                         m->my = m->wy = unique[i].y_org;
2011                                         m->mw = m->ww = unique[i].width;
2012                                         m->mh = m->wh = unique[i].height;
2013                                         updatebarpos(m);
2014                                 }
2015                 } else { /* less monitors available nn < n */
2016                         for (i = nn; i < n; i++) {
2017                                 for (m = mons; m && m->next; m = m->next);
2018                                 while ((c = m->clients)) {
2019                                         dirty = 1;
2020                                         m->clients = c->next;
2021                                         detachstack(c);
2022                                         c->mon = mons;
2023                                         attach(c);
2024                                         attachstack(c);
2025                                 }
2026                                 if (m == selmon)
2027                                         selmon = mons;
2028                                 cleanupmon(m);
2029                         }
2030                 }
2031                 free(unique);
2032         } else
2033 #endif /* XINERAMA */
2034         { /* default monitor setup */
2035                 if (!mons)
2036                         mons = createmon();
2037                 if (mons->mw != sw || mons->mh != sh) {
2038                         dirty = 1;
2039                         mons->mw = mons->ww = sw;
2040                         mons->mh = mons->wh = sh;
2041                         updatebarpos(mons);
2042                 }
2043         }
2044         if (dirty) {
2045                 selmon = mons;
2046                 selmon = wintomon(root);
2047         }
2048         return dirty;
2049 }
2050
2051 void
2052 updatenumlockmask(void)
2053 {
2054         unsigned int i, j;
2055         XModifierKeymap *modmap;
2056
2057         numlockmask = 0;
2058         modmap = XGetModifierMapping(dpy);
2059         for (i = 0; i < 8; i++)
2060                 for (j = 0; j < modmap->max_keypermod; j++)
2061                         if (modmap->modifiermap[i * modmap->max_keypermod + j]
2062                                 == XKeysymToKeycode(dpy, XK_Num_Lock))
2063                                 numlockmask = (1 << i);
2064         XFreeModifiermap(modmap);
2065 }
2066
2067 void
2068 updatesizehints(Client *c)
2069 {
2070         long msize;
2071         XSizeHints size;
2072
2073         if (!XGetWMNormalHints(dpy, c->win, &size, &msize))
2074                 /* size is uninitialized, ensure that size.flags aren't used */
2075                 size.flags = PSize;
2076         if (size.flags & PBaseSize) {
2077                 c->basew = size.base_width;
2078                 c->baseh = size.base_height;
2079         } else if (size.flags & PMinSize) {
2080                 c->basew = size.min_width;
2081                 c->baseh = size.min_height;
2082         } else
2083                 c->basew = c->baseh = 0;
2084         if (size.flags & PResizeInc) {
2085                 c->incw = size.width_inc;
2086                 c->inch = size.height_inc;
2087         } else
2088                 c->incw = c->inch = 0;
2089         if (size.flags & PMaxSize) {
2090                 c->maxw = size.max_width;
2091                 c->maxh = size.max_height;
2092         } else
2093                 c->maxw = c->maxh = 0;
2094         if (size.flags & PMinSize) {
2095                 c->minw = size.min_width;
2096                 c->minh = size.min_height;
2097         } else if (size.flags & PBaseSize) {
2098                 c->minw = size.base_width;
2099                 c->minh = size.base_height;
2100         } else
2101                 c->minw = c->minh = 0;
2102         if (size.flags & PAspect) {
2103                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2104                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2105         } else
2106                 c->maxa = c->mina = 0.0;
2107         c->isfixed = (c->maxw && c->maxh && c->maxw == c->minw && c->maxh == c->minh);
2108 }
2109
2110 void
2111 updatestatus(void)
2112 {
2113         if (!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2114                 strcpy(stext, "dwm-"VERSION);
2115         drawbar(selmon);
2116 }
2117
2118 void
2119 updatetitle(Client *c)
2120 {
2121         if (!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2122                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2123         if (c->name[0] == '\0') /* hack to mark broken clients */
2124                 strcpy(c->name, broken);
2125 }
2126
2127 void
2128 updatewindowtype(Client *c)
2129 {
2130         Atom state = getatomprop(c, netatom[NetWMState]);
2131         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2132
2133         if (state == netatom[NetWMFullscreen])
2134                 setfullscreen(c, 1);
2135         if (wtype == netatom[NetWMWindowTypeDialog])
2136                 c->isfloating = 1;
2137 }
2138
2139 void
2140 updatewmhints(Client *c)
2141 {
2142         XWMHints *wmh;
2143
2144         if ((wmh = XGetWMHints(dpy, c->win))) {
2145                 if (c == selmon->sel && wmh->flags & XUrgencyHint) {
2146                         wmh->flags &= ~XUrgencyHint;
2147                         XSetWMHints(dpy, c->win, wmh);
2148                 } else
2149                         c->isurgent = (wmh->flags & XUrgencyHint) ? 1 : 0;
2150                 if (wmh->flags & InputHint)
2151                         c->neverfocus = !wmh->input;
2152                 else
2153                         c->neverfocus = 0;
2154                 XFree(wmh);
2155         }
2156 }
2157
2158 void
2159 view(const Arg *arg)
2160 {
2161         if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2162                 return;
2163         selmon->seltags ^= 1; /* toggle sel tagset */
2164         if (arg->ui & TAGMASK)
2165                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2166         focus(NULL);
2167         arrange(selmon);
2168 }
2169
2170 pid_t
2171 winpid(Window w)
2172 {
2173
2174         pid_t result = 0;
2175
2176 #ifdef __linux__
2177         xcb_res_client_id_spec_t spec = {0};
2178         spec.client = w;
2179         spec.mask = XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID;
2180
2181         xcb_generic_error_t *e = NULL;
2182         xcb_res_query_client_ids_cookie_t c = xcb_res_query_client_ids(xcon, 1, &spec);
2183         xcb_res_query_client_ids_reply_t *r = xcb_res_query_client_ids_reply(xcon, c, &e);
2184
2185         if (!r)
2186                 return (pid_t)0;
2187
2188         xcb_res_client_id_value_iterator_t i = xcb_res_query_client_ids_ids_iterator(r);
2189         for (; i.rem; xcb_res_client_id_value_next(&i)) {
2190                 spec = i.data->spec;
2191                 if (spec.mask & XCB_RES_CLIENT_ID_MASK_LOCAL_CLIENT_PID) {
2192                         uint32_t *t = xcb_res_client_id_value_value(i.data);
2193                         result = *t;
2194                         break;
2195                 }
2196         }
2197
2198         free(r);
2199
2200         if (result == (pid_t)-1)
2201                 result = 0;
2202
2203 #endif /* __linux__ */
2204
2205 #ifdef __OpenBSD__
2206         Atom type;
2207         int format;
2208         unsigned long len, bytes;
2209         unsigned char *prop;
2210         pid_t ret;
2211
2212         if (XGetWindowProperty(dpy, w, XInternAtom(dpy, "_NET_WM_PID", 0), 0, 1, False, AnyPropertyType, &type, &format, &len, &bytes, &prop) != Success || !prop)
2213                return 0;
2214
2215         ret = *(pid_t*)prop;
2216         XFree(prop);
2217         result = ret;
2218
2219 #endif /* __OpenBSD__ */
2220         return result;
2221 }
2222
2223 pid_t
2224 getparentprocess(pid_t p)
2225 {
2226         unsigned int v = 0;
2227
2228 #ifdef __linux__
2229         FILE *f;
2230         char buf[256];
2231         snprintf(buf, sizeof(buf) - 1, "/proc/%u/stat", (unsigned)p);
2232
2233         if (!(f = fopen(buf, "r")))
2234                 return 0;
2235
2236         fscanf(f, "%*u %*s %*c %u", &v);
2237         fclose(f);
2238 #endif /* __linux__*/
2239
2240 #ifdef __OpenBSD__
2241         int n;
2242         kvm_t *kd;
2243         struct kinfo_proc *kp;
2244
2245         kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, NULL);
2246         if (!kd)
2247                 return 0;
2248
2249         kp = kvm_getprocs(kd, KERN_PROC_PID, p, sizeof(*kp), &n);
2250         v = kp->p_ppid;
2251 #endif /* __OpenBSD__ */
2252
2253         return (pid_t)v;
2254 }
2255
2256 int
2257 isdescprocess(pid_t p, pid_t c)
2258 {
2259         while (p != c && c != 0)
2260                 c = getparentprocess(c);
2261
2262         return (int)c;
2263 }
2264
2265 Client *
2266 termforwin(const Client *w)
2267 {
2268         Client *c;
2269         Monitor *m;
2270
2271         if (!w->pid || w->isterminal)
2272                 return NULL;
2273
2274         for (m = mons; m; m = m->next) {
2275                 for (c = m->clients; c; c = c->next) {
2276                         if (c->isterminal && !c->swallowing && c->pid && isdescprocess(c->pid, w->pid))
2277                                 return c;
2278                 }
2279         }
2280
2281         return NULL;
2282 }
2283
2284 Client *
2285 swallowingclient(Window w)
2286 {
2287         Client *c;
2288         Monitor *m;
2289
2290         for (m = mons; m; m = m->next) {
2291                 for (c = m->clients; c; c = c->next) {
2292                         if (c->swallowing && c->swallowing->win == w)
2293                                 return c;
2294                 }
2295         }
2296
2297         return NULL;
2298 }
2299
2300 Client *
2301 wintoclient(Window w)
2302 {
2303         Client *c;
2304         Monitor *m;
2305
2306         for (m = mons; m; m = m->next)
2307                 for (c = m->clients; c; c = c->next)
2308                         if (c->win == w)
2309                                 return c;
2310         return NULL;
2311 }
2312
2313 Monitor *
2314 wintomon(Window w)
2315 {
2316         int x, y;
2317         Client *c;
2318         Monitor *m;
2319
2320         if (w == root && getrootptr(&x, &y))
2321                 return recttomon(x, y, 1, 1);
2322         for (m = mons; m; m = m->next)
2323                 if (w == m->barwin)
2324                         return m;
2325         if ((c = wintoclient(w)))
2326                 return c->mon;
2327         return selmon;
2328 }
2329
2330 /* There's no way to check accesses to destroyed windows, thus those cases are
2331  * ignored (especially on UnmapNotify's). Other types of errors call Xlibs
2332  * default error handler, which may call exit. */
2333 int
2334 xerror(Display *dpy, XErrorEvent *ee)
2335 {
2336         if (ee->error_code == BadWindow
2337         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2338         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2339         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2340         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2341         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2342         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2343         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2344         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2345                 return 0;
2346         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2347                 ee->request_code, ee->error_code);
2348         return xerrorxlib(dpy, ee); /* may call exit */
2349 }
2350
2351 int
2352 xerrordummy(Display *dpy, XErrorEvent *ee)
2353 {
2354         return 0;
2355 }
2356
2357 /* Startup Error handler to check if another window manager
2358  * is already running. */
2359 int
2360 xerrorstart(Display *dpy, XErrorEvent *ee)
2361 {
2362         die("dwm: another window manager is already running");
2363         return -1;
2364 }
2365
2366 void
2367 xinitvisual()
2368 {
2369         XVisualInfo *infos;
2370         XRenderPictFormat *fmt;
2371         int nitems;
2372         int i;
2373
2374         XVisualInfo tpl = {
2375                 .screen = screen,
2376                 .depth = 32,
2377                 .class = TrueColor
2378         };
2379         long masks = VisualScreenMask | VisualDepthMask | VisualClassMask;
2380
2381         infos = XGetVisualInfo(dpy, masks, &tpl, &nitems);
2382         visual = NULL;
2383         for(i = 0; i < nitems; i ++) {
2384                 fmt = XRenderFindVisualFormat(dpy, infos[i].visual);
2385                 if (fmt->type == PictTypeDirect && fmt->direct.alphaMask) {
2386                         visual = infos[i].visual;
2387                         depth = infos[i].depth;
2388                         cmap = XCreateColormap(dpy, root, visual, AllocNone);
2389                         useargb = 1;
2390                         break;
2391                 }
2392         }
2393
2394         XFree(infos);
2395
2396         if (! visual) {
2397                 visual = DefaultVisual(dpy, screen);
2398                 depth = DefaultDepth(dpy, screen);
2399                 cmap = DefaultColormap(dpy, screen);
2400         }
2401 }
2402
2403 void
2404 zoom(const Arg *arg)
2405 {
2406         Client *c = selmon->sel;
2407
2408         if (!selmon->lt[selmon->sellt]->arrange
2409         || (selmon->sel && selmon->sel->isfloating))
2410                 return;
2411         if (c == nexttiled(selmon->clients))
2412                 if (!c || !(c = nexttiled(c->next)))
2413                         return;
2414         pop(c);
2415 }
2416
2417 int
2418 main(int argc, char *argv[])
2419 {
2420         if (argc == 2 && !strcmp("-v", argv[1]))
2421                 die("dwm-"VERSION);
2422         else if (argc != 1)
2423                 die("usage: dwm [-v]");
2424         if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2425                 fputs("warning: no locale support\n", stderr);
2426         if (!(dpy = XOpenDisplay(NULL)))
2427                 die("dwm: cannot open display");
2428         if (!(xcon = XGetXCBConnection(dpy)))
2429                 die("dwm: cannot get xcb connection\n");
2430         checkotherwm();
2431         setup();
2432 #ifdef __OpenBSD__
2433         if (pledge("stdio rpath proc exec ps", NULL) == -1)
2434                 die("pledge");
2435 #endif /* __OpenBSD__ */
2436         scan();
2437         run();
2438         cleanup();
2439         XCloseDisplay(dpy);
2440         return EXIT_SUCCESS;
2441 }