dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  47 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  48 #define LENGTH(X)               (sizeof X / sizeof X[0])
  49 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  50 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  51 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  52 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  53 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  54 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  55 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  56
  57 /* enums */
  58 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  59 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  60 enum { NetSupported, NetWMName, NetWMState,
  61        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  62        NetWMWindowTypeDialog, NetLast };     /* EWMH atoms */
  63 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  64 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  65        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  66
  67 typedef union {
  68         int i;
  69         unsigned int ui;
  70         float f;
  71         const void *v;
  72 } Arg;
  73
  74 typedef struct {
  75         unsigned int click;
  76         unsigned int mask;
  77         unsigned int button;
  78         void (*func)(const Arg *arg);
  79         const Arg arg;
  80 } Button;
  81
  82 typedef struct Monitor Monitor;
  83 typedef struct Client Client;
  84 struct Client {
  85         char name[256];
  86         float mina, maxa;
  87         int x, y, w, h;
  88         int oldx, oldy, oldw, oldh;
  89         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  90         int bw, oldbw;
  91         unsigned int tags;
  92         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  93         Client *next;
  94         Client *snext;
  95         Monitor *mon;
  96         Window win;
  97 };
  98
  99 typedef struct {
 100         int x, y, w, h;
 101         unsigned long norm[ColLast];
 102         unsigned long sel[ColLast];
 103         Drawable drawable;
 104         GC gc;
 105         struct {
 106                 int ascent;
 107                 int descent;
 108                 int height;
 109                 XFontSet set;
 110                 XFontStruct *xfont;
 111         } font;
 112 } DC; /* draw context */
 113
 114 typedef struct {
 115         unsigned int mod;
 116         KeySym keysym;
 117         void (*func)(const Arg *);
 118         const Arg arg;
 119 } Key;
 120
 121 typedef struct {
 122         const char *symbol;
 123         void (*arrange)(Monitor *);
 124 } Layout;
 125
 126 struct Monitor {
 127         char ltsymbol[16];
 128         float mfact;
 129         int nmaster;
 130         int num;
 131         int by;               /* bar geometry */
 132         int mx, my, mw, mh;   /* screen size */
 133         int wx, wy, ww, wh;   /* window area  */
 134         unsigned int seltags;
 135         unsigned int sellt;
 136         unsigned int tagset[2];
 137         Bool showbar;
 138         Bool topbar;
 139         Client *clients;
 140         Client *sel;
 141         Client *stack;
 142         Monitor *next;
 143         Window barwin;
 144         const Layout *lt[2];
 145 };
 146
 147 typedef struct {
 148         const char *class;
 149         const char *instance;
 150         const char *title;
 151         unsigned int tags;
 152         Bool isfloating;
 153         int monitor;
 154 } Rule;
 155
 156 /* function declarations */
 157 static void applyrules(Client *c);
 158 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool 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 clearurgent(Client *c);
 168 static void clientmessage(XEvent *e);
 169 static void configure(Client *c);
 170 static void configurenotify(XEvent *e);
 171 static void configurerequest(XEvent *e);
 172 static Monitor *createmon(void);
 173 static void destroynotify(XEvent *e);
 174 static void detach(Client *c);
 175 static void detachstack(Client *c);
 176 static void die(const char *errstr, ...);
 177 static Monitor *dirtomon(int dir);
 178 static void drawbar(Monitor *m);
 179 static void drawbars(void);
 180 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 181 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 182 static void enternotify(XEvent *e);
 183 static void expose(XEvent *e);
 184 static void focus(Client *c);
 185 static void focusin(XEvent *e);
 186 static void focusmon(const Arg *arg);
 187 static void focusstack(const Arg *arg);
 188 static unsigned long getcolor(const char *colstr);
 189 static Bool getrootptr(int *x, int *y);
 190 static long getstate(Window w);
 191 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 192 static void grabbuttons(Client *c, Bool focused);
 193 static void grabkeys(void);
 194 static void incnmaster(const Arg *arg);
 195 static void initfont(const char *fontstr);
 196 static void keypress(XEvent *e);
 197 static void killclient(const Arg *arg);
 198 static void manage(Window w, XWindowAttributes *wa);
 199 static void mappingnotify(XEvent *e);
 200 static void maprequest(XEvent *e);
 201 static void monocle(Monitor *m);
 202 static void movemouse(const Arg *arg);
 203 static Client *nexttiled(Client *c);
 204 static void pop(Client *);
 205 static void propertynotify(XEvent *e);
 206 static Monitor *ptrtomon(int x, int y);
 207 static void quit(const Arg *arg);
 208 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 209 static void resizeclient(Client *c, int x, int y, int w, int h);
 210 static void resizemouse(const Arg *arg);
 211 static void restack(Monitor *m);
 212 static void run(void);
 213 static void scan(void);
 214 static Bool sendevent(Client *c, Atom proto);
 215 static void sendmon(Client *c, Monitor *m);
 216 static void setclientstate(Client *c, long state);
 217 static void setfocus(Client *c);
 218 static void setlayout(const Arg *arg);
 219 static void setmfact(const Arg *arg);
 220 static void setup(void);
 221 static void showhide(Client *c);
 222 static void sigchld(int unused);
 223 static void spawn(const Arg *arg);
 224 static void tag(const Arg *arg);
 225 static void tagmon(const Arg *arg);
 226 static int textnw(const char *text, unsigned int len);
 227 static void tile(Monitor *);
 228 static void togglebar(const Arg *arg);
 229 static void togglefloating(const Arg *arg);
 230 static void toggletag(const Arg *arg);
 231 static void toggleview(const Arg *arg);
 232 static void unfocus(Client *c, Bool setfocus);
 233 static void unmanage(Client *c, Bool destroyed);
 234 static void unmapnotify(XEvent *e);
 235 static Bool updategeom(void);
 236 static void updatebarpos(Monitor *m);
 237 static void updatebars(void);
 238 static void updatenumlockmask(void);
 239 static void updatesizehints(Client *c);
 240 static void updatestatus(void);
 241 static void updatewindowtype(Client *c);
 242 static void updatetitle(Client *c);
 243 static void updatewmhints(Client *c);
 244 static void view(const Arg *arg);
 245 static Client *wintoclient(Window w);
 246 static Monitor *wintomon(Window w);
 247 static int xerror(Display *dpy, XErrorEvent *ee);
 248 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 249 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 250 static void zoom(const Arg *arg);
 251
 252 /* variables */
 253 static const char broken[] = "broken";
 254 static char stext[256];
 255 static int screen;
 256 static int sw, sh;           /* X display screen geometry width, height */
 257 static int bh, blw = 0;      /* bar geometry */
 258 static int (*xerrorxlib)(Display *, XErrorEvent *);
 259 static unsigned int numlockmask = 0;
 260 static void (*handler[LASTEvent]) (XEvent *) = {
 261         [ButtonPress] = buttonpress,
 262         [ClientMessage] = clientmessage,
 263         [ConfigureRequest] = configurerequest,
 264         [ConfigureNotify] = configurenotify,
 265         [DestroyNotify] = destroynotify,
 266         [EnterNotify] = enternotify,
 267         [Expose] = expose,
 268         [FocusIn] = focusin,
 269         [KeyPress] = keypress,
 270         [MappingNotify] = mappingnotify,
 271         [MapRequest] = maprequest,
 272         [PropertyNotify] = propertynotify,
 273         [UnmapNotify] = unmapnotify
 274 };
 275 static Atom wmatom[WMLast], netatom[NetLast];
 276 static Bool running = True;
 277 static Cursor cursor[CurLast];
 278 static Display *dpy;
 279 static DC dc;
 280 static Monitor *mons = NULL, *selmon = NULL;
 281 static Window root;
 282
 283 /* configuration, allows nested code to access above variables */
 284 #include "config.h"
 285
 286 /* compile-time check if all tags fit into an unsigned int bit array. */
 287 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 288
 289 /* function implementations */
 290 void
 291 applyrules(Client *c) {
 292         const char *class, *instance;
 293         unsigned int i;
 294         const Rule *r;
 295         Monitor *m;
 296         XClassHint ch = { NULL, NULL };
 297
 298         /* rule matching */
 299         c->isfloating = c->tags = 0;
 300         XGetClassHint(dpy, c->win, &ch);
 301         class    = ch.res_class ? ch.res_class : broken;
 302         instance = ch.res_name  ? ch.res_name  : broken;
 303
 304         for(i = 0; i < LENGTH(rules); i++) {
 305                 r = &rules[i];
 306                 if((!r->title || strstr(c->name, r->title))
 307                 && (!r->class || strstr(class, r->class))
 308                 && (!r->instance || strstr(instance, r->instance)))
 309                 {
 310                         c->isfloating = r->isfloating;
 311                         c->tags |= r->tags;
 312                         for(m = mons; m && m->num != r->monitor; m = m->next);
 313                         if(m)
 314                                 c->mon = m;
 315                 }
 316         }
 317         if(ch.res_class)
 318                 XFree(ch.res_class);
 319         if(ch.res_name)
 320                 XFree(ch.res_name);
 321         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 322 }
 323
 324 Bool
 325 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 326         Bool baseismin;
 327         Monitor *m = c->mon;
 328
 329         /* set minimum possible */
 330         *w = MAX(1, *w);
 331         *h = MAX(1, *h);
 332         if(interact) {
 333                 if(*x > sw)
 334                         *x = sw - WIDTH(c);
 335                 if(*y > sh)
 336                         *y = sh - HEIGHT(c);
 337                 if(*x + *w + 2 * c->bw < 0)
 338                         *x = 0;
 339                 if(*y + *h + 2 * c->bw < 0)
 340                         *y = 0;
 341         }
 342         else {
 343                 if(*x > m->mx + m->mw)
 344                         *x = m->mx + m->mw - WIDTH(c);
 345                 if(*y > m->my + m->mh)
 346                         *y = m->my + m->mh - HEIGHT(c);
 347                 if(*x + *w + 2 * c->bw < m->mx)
 348                         *x = m->mx;
 349                 if(*y + *h + 2 * c->bw < m->my)
 350                         *y = m->my;
 351         }
 352         if(*h < bh)
 353                 *h = bh;
 354         if(*w < bh)
 355                 *w = bh;
 356         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 357                 /* see last two sentences in ICCCM 4.1.2.3 */
 358                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 359                 if(!baseismin) { /* temporarily remove base dimensions */
 360                         *w -= c->basew;
 361                         *h -= c->baseh;
 362                 }
 363                 /* adjust for aspect limits */
 364                 if(c->mina > 0 && c->maxa > 0) {
 365                         if(c->maxa < (float)*w / *h)
 366                                 *w = *h * c->maxa + 0.5;
 367                         else if(c->mina < (float)*h / *w)
 368                                 *h = *w * c->mina + 0.5;
 369                 }
 370                 if(baseismin) { /* increment calculation requires this */
 371                         *w -= c->basew;
 372                         *h -= c->baseh;
 373                 }
 374                 /* adjust for increment value */
 375                 if(c->incw)
 376                         *w -= *w % c->incw;
 377                 if(c->inch)
 378                         *h -= *h % c->inch;
 379                 /* restore base dimensions */
 380                 *w = MAX(*w + c->basew, c->minw);
 381                 *h = MAX(*h + c->baseh, c->minh);
 382                 if(c->maxw)
 383                         *w = MIN(*w, c->maxw);
 384                 if(c->maxh)
 385                         *h = MIN(*h, c->maxh);
 386         }
 387         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 388 }
 389
 390 void
 391 arrange(Monitor *m) {
 392         if(m)
 393                 showhide(m->stack);
 394         else for(m = mons; m; m = m->next)
 395                 showhide(m->stack);
 396         if(m)
 397                 arrangemon(m);
 398         else for(m = mons; m; m = m->next)
 399                 arrangemon(m);
 400 }
 401
 402 void
 403 arrangemon(Monitor *m) {
 404         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 405         if(m->lt[m->sellt]->arrange)
 406                 m->lt[m->sellt]->arrange(m);
 407         restack(m);
 408 }
 409
 410 void
 411 attach(Client *c) {
 412         c->next = c->mon->clients;
 413         c->mon->clients = c;
 414 }
 415
 416 void
 417 attachstack(Client *c) {
 418         c->snext = c->mon->stack;
 419         c->mon->stack = c;
 420 }
 421
 422 void
 423 buttonpress(XEvent *e) {
 424         unsigned int i, x, click;
 425         Arg arg = {0};
 426         Client *c;
 427         Monitor *m;
 428         XButtonPressedEvent *ev = &e->xbutton;
 429
 430         click = ClkRootWin;
 431         /* focus monitor if necessary */
 432         if((m = wintomon(ev->window)) && m != selmon) {
 433                 unfocus(selmon->sel, True);
 434                 selmon = m;
 435                 focus(NULL);
 436         }
 437         if(ev->window == selmon->barwin) {
 438                 i = x = 0;
 439                 do
 440                         x += TEXTW(tags[i]);
 441                 while(ev->x >= x && ++i < LENGTH(tags));
 442                 if(i < LENGTH(tags)) {
 443                         click = ClkTagBar;
 444                         arg.ui = 1 << i;
 445                 }
 446                 else if(ev->x < x + blw)
 447                         click = ClkLtSymbol;
 448                 else if(ev->x > selmon->ww - TEXTW(stext))
 449                         click = ClkStatusText;
 450                 else
 451                         click = ClkWinTitle;
 452         }
 453         else if((c = wintoclient(ev->window))) {
 454                 focus(c);
 455                 click = ClkClientWin;
 456         }
 457         for(i = 0; i < LENGTH(buttons); i++)
 458                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 459                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 460                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 461 }
 462
 463 void
 464 checkotherwm(void) {
 465         xerrorxlib = XSetErrorHandler(xerrorstart);
 466         /* this causes an error if some other window manager is running */
 467         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 468         XSync(dpy, False);
 469         XSetErrorHandler(xerror);
 470         XSync(dpy, False);
 471 }
 472
 473 void
 474 cleanup(void) {
 475         Arg a = {.ui = ~0};
 476         Layout foo = { "", NULL };
 477         Monitor *m;
 478
 479         view(&a);
 480         selmon->lt[selmon->sellt] = &foo;
 481         for(m = mons; m; m = m->next)
 482                 while(m->stack)
 483                         unmanage(m->stack, False);
 484         if(dc.font.set)
 485                 XFreeFontSet(dpy, dc.font.set);
 486         else
 487                 XFreeFont(dpy, dc.font.xfont);
 488         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 489         XFreePixmap(dpy, dc.drawable);
 490         XFreeGC(dpy, dc.gc);
 491         XFreeCursor(dpy, cursor[CurNormal]);
 492         XFreeCursor(dpy, cursor[CurResize]);
 493         XFreeCursor(dpy, cursor[CurMove]);
 494         while(mons)
 495                 cleanupmon(mons);
 496         XSync(dpy, False);
 497         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 498 }
 499
 500 void
 501 cleanupmon(Monitor *mon) {
 502         Monitor *m;
 503
 504         if(mon == mons)
 505                 mons = mons->next;
 506         else {
 507                 for(m = mons; m && m->next != mon; m = m->next);
 508                 m->next = mon->next;
 509         }
 510         XUnmapWindow(dpy, mon->barwin);
 511         XDestroyWindow(dpy, mon->barwin);
 512         free(mon);
 513 }
 514
 515 void
 516 clearurgent(Client *c) {
 517         XWMHints *wmh;
 518
 519         c->isurgent = False;
 520         if(!(wmh = XGetWMHints(dpy, c->win)))
 521                 return;
 522         wmh->flags &= ~XUrgencyHint;
 523         XSetWMHints(dpy, c->win, wmh);
 524         XFree(wmh);
 525 }
 526
 527 void
 528 clientmessage(XEvent *e) {
 529         XClientMessageEvent *cme = &e->xclient;
 530         Client *c = wintoclient(cme->window);
 531
 532         if(!c)
 533                 return;
 534         if(cme->message_type == netatom[NetWMState] && cme->data.l[1] == netatom[NetWMFullscreen]) {
 535                 if(cme->data.l[0] && !c->isfullscreen) {
 536                         XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32,
 537                                         PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
 538                         c->isfullscreen = True;
 539                         c->oldstate = c->isfloating;
 540                         c->oldbw = c->bw;
 541                         c->bw = 0;
 542                         c->isfloating = True;
 543                         resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
 544                         XRaiseWindow(dpy, c->win);
 545                 }
 546                 else {
 547                         XChangeProperty(dpy, cme->window, netatom[NetWMState], XA_ATOM, 32,
 548                                         PropModeReplace, (unsigned char*)0, 0);
 549                         c->isfullscreen = False;
 550                         c->isfloating = c->oldstate;
 551                         c->bw = c->oldbw;
 552                         c->x = c->oldx;
 553                         c->y = c->oldy;
 554                         c->w = c->oldw;
 555                         c->h = c->oldh;
 556                         resizeclient(c, c->x, c->y, c->w, c->h);
 557                         arrange(c->mon);
 558                 }
 559         }
 560         else if(cme->message_type == netatom[NetActiveWindow]) {
 561                 if(!ISVISIBLE(c)) {
 562                         c->mon->seltags ^= 1;
 563                         c->mon->tagset[c->mon->seltags] = c->tags;
 564                 }
 565                 pop(c);
 566         }
 567 }
 568
 569 void
 570 configure(Client *c) {
 571         XConfigureEvent ce;
 572
 573         ce.type = ConfigureNotify;
 574         ce.display = dpy;
 575         ce.event = c->win;
 576         ce.window = c->win;
 577         ce.x = c->x;
 578         ce.y = c->y;
 579         ce.width = c->w;
 580         ce.height = c->h;
 581         ce.border_width = c->bw;
 582         ce.above = None;
 583         ce.override_redirect = False;
 584         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 585 }
 586
 587 void
 588 configurenotify(XEvent *e) {
 589         Monitor *m;
 590         XConfigureEvent *ev = &e->xconfigure;
 591         Bool dirty;
 592
 593         if(ev->window == root) {
 594                 dirty = (sw != ev->width);
 595                 sw = ev->width;
 596                 sh = ev->height;
 597                 if(updategeom() || dirty) {
 598                         if(dc.drawable != 0)
 599                                 XFreePixmap(dpy, dc.drawable);
 600                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 601                         updatebars();
 602                         for(m = mons; m; m = m->next)
 603                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 604                         focus(NULL);
 605                         arrange(NULL);
 606                 }
 607         }
 608 }
 609
 610 void
 611 configurerequest(XEvent *e) {
 612         Client *c;
 613         Monitor *m;
 614         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 615         XWindowChanges wc;
 616
 617         if((c = wintoclient(ev->window))) {
 618                 if(ev->value_mask & CWBorderWidth)
 619                         c->bw = ev->border_width;
 620                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 621                         m = c->mon;
 622                         if(ev->value_mask & CWX) {
 623                                 c->oldx = c->x;
 624                                 c->x = m->mx + ev->x;
 625                         }
 626                         if(ev->value_mask & CWY) {
 627                                 c->oldy = c->y;
 628                                 c->y = m->my + ev->y;
 629                         }
 630                         if(ev->value_mask & CWWidth) {
 631                                 c->oldw = c->w;
 632                                 c->w = ev->width;
 633                         }
 634                         if(ev->value_mask & CWHeight) {
 635                                 c->oldh = c->h;
 636                                 c->h = ev->height;
 637                         }
 638                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 639                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 640                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 641                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 642                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 643                                 configure(c);
 644                         if(ISVISIBLE(c))
 645                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 646                 }
 647                 else
 648                         configure(c);
 649         }
 650         else {
 651                 wc.x = ev->x;
 652                 wc.y = ev->y;
 653                 wc.width = ev->width;
 654                 wc.height = ev->height;
 655                 wc.border_width = ev->border_width;
 656                 wc.sibling = ev->above;
 657                 wc.stack_mode = ev->detail;
 658                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 659         }
 660         XSync(dpy, False);
 661 }
 662
 663 Monitor *
 664 createmon(void) {
 665         Monitor *m;
 666
 667         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 668                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 669         m->tagset[0] = m->tagset[1] = 1;
 670         m->mfact = mfact;
 671         m->nmaster = nmaster;
 672         m->showbar = showbar;
 673         m->topbar = topbar;
 674         m->lt[0] = &layouts[0];
 675         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 676         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 677         return m;
 678 }
 679
 680 void
 681 destroynotify(XEvent *e) {
 682         Client *c;
 683         XDestroyWindowEvent *ev = &e->xdestroywindow;
 684
 685         if((c = wintoclient(ev->window)))
 686                 unmanage(c, True);
 687 }
 688
 689 void
 690 detach(Client *c) {
 691         Client **tc;
 692
 693         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 694         *tc = c->next;
 695 }
 696
 697 void
 698 detachstack(Client *c) {
 699         Client **tc, *t;
 700
 701         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 702         *tc = c->snext;
 703
 704         if(c == c->mon->sel) {
 705                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 706                 c->mon->sel = t;
 707         }
 708 }
 709
 710 void
 711 die(const char *errstr, ...) {
 712         va_list ap;
 713
 714         va_start(ap, errstr);
 715         vfprintf(stderr, errstr, ap);
 716         va_end(ap);
 717         exit(EXIT_FAILURE);
 718 }
 719
 720 Monitor *
 721 dirtomon(int dir) {
 722         Monitor *m = NULL;
 723
 724         if(dir > 0) {
 725                 if(!(m = selmon->next))
 726                         m = mons;
 727         }
 728         else if(selmon == mons)
 729                 for(m = mons; m->next; m = m->next);
 730         else
 731                 for(m = mons; m->next != selmon; m = m->next);
 732         return m;
 733 }
 734
 735 void
 736 drawbar(Monitor *m) {
 737         int x;
 738         unsigned int i, occ = 0, urg = 0;
 739         unsigned long *col;
 740         Client *c;
 741
 742         for(c = m->clients; c; c = c->next) {
 743                 occ |= c->tags;
 744                 if(c->isurgent)
 745                         urg |= c->tags;
 746         }
 747         dc.x = 0;
 748         for(i = 0; i < LENGTH(tags); i++) {
 749                 dc.w = TEXTW(tags[i]);
 750                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 751                 drawtext(tags[i], col, urg & 1 << i);
 752                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 753                            occ & 1 << i, urg & 1 << i, col);
 754                 dc.x += dc.w;
 755         }
 756         dc.w = blw = TEXTW(m->ltsymbol);
 757         drawtext(m->ltsymbol, dc.norm, False);
 758         dc.x += dc.w;
 759         x = dc.x;
 760         if(m == selmon) { /* status is only drawn on selected monitor */
 761                 dc.w = TEXTW(stext);
 762                 dc.x = m->ww - dc.w;
 763                 if(dc.x < x) {
 764                         dc.x = x;
 765                         dc.w = m->ww - x;
 766                 }
 767                 drawtext(stext, dc.norm, False);
 768         }
 769         else
 770                 dc.x = m->ww;
 771         if((dc.w = dc.x - x) > bh) {
 772                 dc.x = x;
 773                 if(m->sel) {
 774                         col = m == selmon ? dc.sel : dc.norm;
 775                         drawtext(m->sel->name, col, False);
 776                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 777                 }
 778                 else
 779                         drawtext(NULL, dc.norm, False);
 780         }
 781         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 782         XSync(dpy, False);
 783 }
 784
 785 void
 786 drawbars(void) {
 787         Monitor *m;
 788
 789         for(m = mons; m; m = m->next)
 790                 drawbar(m);
 791 }
 792
 793 void
 794 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 795         int x;
 796
 797         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 798         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 799         if(filled)
 800                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 801         else if(empty)
 802                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 803 }
 804
 805 void
 806 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 807         char buf[256];
 808         int i, x, y, h, len, olen;
 809
 810         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 811         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 812         if(!text)
 813                 return;
 814         olen = strlen(text);
 815         h = dc.font.ascent + dc.font.descent;
 816         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 817         x = dc.x + (h / 2);
 818         /* shorten text if necessary */
 819         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 820         if(!len)
 821                 return;
 822         memcpy(buf, text, len);
 823         if(len < olen)
 824                 for(i = len; i && i > len - 3; buf[--i] = '.');
 825         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 826         if(dc.font.set)
 827                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 828         else
 829                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 830 }
 831
 832 void
 833 enternotify(XEvent *e) {
 834         Client *c;
 835         Monitor *m;
 836         XCrossingEvent *ev = &e->xcrossing;
 837
 838         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 839                 return;
 840         c = wintoclient(ev->window);
 841         m = c ? c->mon : wintomon(ev->window);
 842         if(m != selmon) {
 843                 unfocus(selmon->sel, True);
 844                 selmon = m;
 845         }
 846         else if(!c || c == selmon->sel)
 847                 return;
 848         focus(c);
 849 }
 850
 851 void
 852 expose(XEvent *e) {
 853         Monitor *m;
 854         XExposeEvent *ev = &e->xexpose;
 855
 856         if(ev->count == 0 && (m = wintomon(ev->window)))
 857                 drawbar(m);
 858 }
 859
 860 void
 861 focus(Client *c) {
 862         if(!c || !ISVISIBLE(c))
 863                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 864         /* was if(selmon->sel) */
 865         if(selmon->sel && selmon->sel != c)
 866                 unfocus(selmon->sel, False);
 867         if(c) {
 868                 if(c->mon != selmon)
 869                         selmon = c->mon;
 870                 if(c->isurgent)
 871                         clearurgent(c);
 872                 detachstack(c);
 873                 attachstack(c);
 874                 grabbuttons(c, True);
 875                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 876                 setfocus(c);
 877         }
 878         else
 879                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 880         selmon->sel = c;
 881         drawbars();
 882 }
 883
 884 void
 885 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 886         XFocusChangeEvent *ev = &e->xfocus;
 887
 888         if(selmon->sel && ev->window != selmon->sel->win)
 889                 setfocus(selmon->sel);
 890 }
 891
 892 void
 893 focusmon(const Arg *arg) {
 894         Monitor *m;
 895
 896         if(!mons->next)
 897                 return;
 898         if((m = dirtomon(arg->i)) == selmon)
 899                 return;
 900         unfocus(selmon->sel, True);
 901         selmon = m;
 902         focus(NULL);
 903 }
 904
 905 void
 906 focusstack(const Arg *arg) {
 907         Client *c = NULL, *i;
 908
 909         if(!selmon->sel)
 910                 return;
 911         if(arg->i > 0) {
 912                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 913                 if(!c)
 914                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 915         }
 916         else {
 917                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 918                         if(ISVISIBLE(i))
 919                                 c = i;
 920                 if(!c)
 921                         for(; i; i = i->next)
 922                                 if(ISVISIBLE(i))
 923                                         c = i;
 924         }
 925         if(c) {
 926                 focus(c);
 927                 restack(selmon);
 928         }
 929 }
 930
 931 unsigned long
 932 getcolor(const char *colstr) {
 933         Colormap cmap = DefaultColormap(dpy, screen);
 934         XColor color;
 935
 936         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 937                 die("error, cannot allocate color '%s'\n", colstr);
 938         return color.pixel;
 939 }
 940
 941 Bool
 942 getrootptr(int *x, int *y) {
 943         int di;
 944         unsigned int dui;
 945         Window dummy;
 946
 947         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 948 }
 949
 950 long
 951 getstate(Window w) {
 952         int format;
 953         long result = -1;
 954         unsigned char *p = NULL;
 955         unsigned long n, extra;
 956         Atom real;
 957
 958         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 959                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 960                 return -1;
 961         if(n != 0)
 962                 result = *p;
 963         XFree(p);
 964         return result;
 965 }
 966
 967 Bool
 968 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 969         char **list = NULL;
 970         int n;
 971         XTextProperty name;
 972
 973         if(!text || size == 0)
 974                 return False;
 975         text[0] = '\0';
 976         XGetTextProperty(dpy, w, &name, atom);
 977         if(!name.nitems)
 978                 return False;
 979         if(name.encoding == XA_STRING)
 980                 strncpy(text, (char *)name.value, size - 1);
 981         else {
 982                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 983                         strncpy(text, *list, size - 1);
 984                         XFreeStringList(list);
 985                 }
 986         }
 987         text[size - 1] = '\0';
 988         XFree(name.value);
 989         return True;
 990 }
 991
 992 void
 993 grabbuttons(Client *c, Bool focused) {
 994         updatenumlockmask();
 995         {
 996                 unsigned int i, j;
 997                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 998                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 999                 if(focused) {
1000                         for(i = 0; i < LENGTH(buttons); i++)
1001                                 if(buttons[i].click == ClkClientWin)
1002                                         for(j = 0; j < LENGTH(modifiers); j++)
1003                                                 XGrabButton(dpy, buttons[i].button,
1004                                                             buttons[i].mask | modifiers[j],
1005                                                             c->win, False, BUTTONMASK,
1006                                                             GrabModeAsync, GrabModeSync, None, None);
1007                 }
1008                 else
1009                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1010                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1011         }
1012 }
1013
1014 void
1015 grabkeys(void) {
1016         updatenumlockmask();
1017         {
1018                 unsigned int i, j;
1019                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1020                 KeyCode code;
1021
1022                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1023                 for(i = 0; i < LENGTH(keys); i++)
1024                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1025                                 for(j = 0; j < LENGTH(modifiers); j++)
1026                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1027                                                  True, GrabModeAsync, GrabModeAsync);
1028         }
1029 }
1030
1031 void
1032 incnmaster(const Arg *arg) {
1033         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1034         arrange(selmon);
1035 }
1036
1037 void
1038 initfont(const char *fontstr) {
1039         char *def, **missing;
1040         int n;
1041
1042         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1043         if(missing) {
1044                 while(n--)
1045                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1046                 XFreeStringList(missing);
1047         }
1048         if(dc.font.set) {
1049                 XFontStruct **xfonts;
1050                 char **font_names;
1051
1052                 dc.font.ascent = dc.font.descent = 0;
1053                 XExtentsOfFontSet(dc.font.set);
1054                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1055                 while(n--) {
1056                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1057                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1058                         xfonts++;
1059                 }
1060         }
1061         else {
1062                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1063                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1064                         die("error, cannot load font: '%s'\n", fontstr);
1065                 dc.font.ascent = dc.font.xfont->ascent;
1066                 dc.font.descent = dc.font.xfont->descent;
1067         }
1068         dc.font.height = dc.font.ascent + dc.font.descent;
1069 }
1070
1071 #ifdef XINERAMA
1072 static Bool
1073 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1074         while(n--)
1075                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1076                 && unique[n].width == info->width && unique[n].height == info->height)
1077                         return False;
1078         return True;
1079 }
1080 #endif /* XINERAMA */
1081
1082 void
1083 keypress(XEvent *e) {
1084         unsigned int i;
1085         KeySym keysym;
1086         XKeyEvent *ev;
1087
1088         ev = &e->xkey;
1089         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1090         for(i = 0; i < LENGTH(keys); i++)
1091                 if(keysym == keys[i].keysym
1092                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1093                 && keys[i].func)
1094                         keys[i].func(&(keys[i].arg));
1095 }
1096
1097 void
1098 killclient(const Arg *arg) {
1099         if(!selmon->sel)
1100                 return;
1101         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1102                 XGrabServer(dpy);
1103                 XSetErrorHandler(xerrordummy);
1104                 XSetCloseDownMode(dpy, DestroyAll);
1105                 XKillClient(dpy, selmon->sel->win);
1106                 XSync(dpy, False);
1107                 XSetErrorHandler(xerror);
1108                 XUngrabServer(dpy);
1109         }
1110 }
1111
1112 void
1113 manage(Window w, XWindowAttributes *wa) {
1114         Client *c, *t = NULL;
1115         Window trans = None;
1116         XWindowChanges wc;
1117
1118         if(!(c = calloc(1, sizeof(Client))))
1119                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1120         c->win = w;
1121         updatetitle(c);
1122         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1123                 c->mon = t->mon;
1124                 c->tags = t->tags;
1125         }
1126         else {
1127                 c->mon = selmon;
1128                 applyrules(c);
1129         }
1130         /* geometry */
1131         c->x = c->oldx = wa->x;
1132         c->y = c->oldy = wa->y;
1133         c->w = c->oldw = wa->width;
1134         c->h = c->oldh = wa->height;
1135         c->oldbw = wa->border_width;
1136         if(c->w == c->mon->mw && c->h == c->mon->mh) {
1137                 c->isfloating = True; // regression with flash, XXXX
1138                 c->x = c->mon->mx;
1139                 c->y = c->mon->my;
1140                 c->bw = 0;
1141         }
1142         else {
1143                 if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1144                         c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1145                 if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1146                         c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1147                 c->x = MAX(c->x, c->mon->mx);
1148                 /* only fix client y-offset, if the client center might cover the bar */
1149                 c->y = MAX(c->y, ((c->mon->by == 0) && (c->x + (c->w / 2) >= c->mon->wx)
1150                            && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1151                 c->bw = borderpx;
1152         }
1153         wc.border_width = c->bw;
1154         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1155         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1156         configure(c); /* propagates border_width, if size doesn't change */
1157         updatewindowtype(c);
1158         updatesizehints(c);
1159         updatewmhints(c);
1160         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1161         grabbuttons(c, False);
1162         if(!c->isfloating)
1163                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1164         if(c->isfloating)
1165                 XRaiseWindow(dpy, c->win);
1166         attach(c);
1167         attachstack(c);
1168         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1169         setclientstate(c, NormalState);
1170         if (c->mon == selmon)
1171                 unfocus(selmon->sel, False);
1172         c->mon->sel = c;
1173         arrange(c->mon);
1174         XMapWindow(dpy, c->win);
1175         focus(NULL);
1176 }
1177
1178 void
1179 mappingnotify(XEvent *e) {
1180         XMappingEvent *ev = &e->xmapping;
1181
1182         XRefreshKeyboardMapping(ev);
1183         if(ev->request == MappingKeyboard)
1184                 grabkeys();
1185 }
1186
1187 void
1188 maprequest(XEvent *e) {
1189         static XWindowAttributes wa;
1190         XMapRequestEvent *ev = &e->xmaprequest;
1191
1192         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1193                 return;
1194         if(wa.override_redirect)
1195                 return;
1196         if(!wintoclient(ev->window))
1197                 manage(ev->window, &wa);
1198 }
1199
1200 void
1201 monocle(Monitor *m) {
1202         unsigned int n = 0;
1203         Client *c;
1204
1205         for(c = m->clients; c; c = c->next)
1206                 if(ISVISIBLE(c))
1207                         n++;
1208         if(n > 0) /* override layout symbol */
1209                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1210         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1211                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1212 }
1213
1214 void
1215 movemouse(const Arg *arg) {
1216         int x, y, ocx, ocy, nx, ny;
1217         Client *c;
1218         Monitor *m;
1219         XEvent ev;
1220
1221         if(!(c = selmon->sel))
1222                 return;
1223         restack(selmon);
1224         ocx = c->x;
1225         ocy = c->y;
1226         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1227         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1228                 return;
1229         if(!getrootptr(&x, &y))
1230                 return;
1231         do {
1232                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1233                 switch(ev.type) {
1234                 case ConfigureRequest:
1235                 case Expose:
1236                 case MapRequest:
1237                         handler[ev.type](&ev);
1238                         break;
1239                 case MotionNotify:
1240                         nx = ocx + (ev.xmotion.x - x);
1241                         ny = ocy + (ev.xmotion.y - y);
1242                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1243                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1244                                 if(abs(selmon->wx - nx) < snap)
1245                                         nx = selmon->wx;
1246                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1247                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1248                                 if(abs(selmon->wy - ny) < snap)
1249                                         ny = selmon->wy;
1250                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1251                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1252                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1253                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1254                                         togglefloating(NULL);
1255                         }
1256                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1257                                 resize(c, nx, ny, c->w, c->h, True);
1258                         break;
1259                 }
1260         } while(ev.type != ButtonRelease);
1261         XUngrabPointer(dpy, CurrentTime);
1262         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1263                 sendmon(c, m);
1264                 selmon = m;
1265                 focus(NULL);
1266         }
1267 }
1268
1269 Client *
1270 nexttiled(Client *c) {
1271         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1272         return c;
1273 }
1274
1275 void
1276 pop(Client *c) {
1277         detach(c);
1278         attach(c);
1279         focus(c);
1280         arrange(c->mon);
1281 }
1282
1283 void
1284 propertynotify(XEvent *e) {
1285         Client *c;
1286         Window trans;
1287         XPropertyEvent *ev = &e->xproperty;
1288
1289         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1290                 updatestatus();
1291         else if(ev->state == PropertyDelete)
1292                 return; /* ignore */
1293         else if((c = wintoclient(ev->window))) {
1294                 switch(ev->atom) {
1295                 default: break;
1296                 case XA_WM_TRANSIENT_FOR:
1297                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1298                            (c->isfloating = (wintoclient(trans)) != NULL))
1299                                 arrange(c->mon);
1300                         break;
1301                 case XA_WM_NORMAL_HINTS:
1302                         updatesizehints(c);
1303                         break;
1304                 case XA_WM_HINTS:
1305                         updatewmhints(c);
1306                         drawbars();
1307                         break;
1308                 }
1309                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1310                         updatetitle(c);
1311                         if(c == c->mon->sel)
1312                                 drawbar(c->mon);
1313                 }
1314                 if(ev->atom == netatom[NetWMWindowType])
1315                         updatewindowtype(c);
1316         }
1317 }
1318
1319 Monitor *
1320 ptrtomon(int x, int y) {
1321         Monitor *m;
1322
1323         for(m = mons; m; m = m->next)
1324                 if(INRECT(x, y, m->wx, m->wy, m->ww, m->wh))
1325                         return m;
1326         return selmon;
1327 }
1328
1329 void
1330 quit(const Arg *arg) {
1331         running = False;
1332 }
1333
1334 void
1335 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1336         if(applysizehints(c, &x, &y, &w, &h, interact))
1337                 resizeclient(c, x, y, w, h);
1338 }
1339
1340 void
1341 resizeclient(Client *c, int x, int y, int w, int h) {
1342         XWindowChanges wc;
1343
1344         c->oldx = c->x; c->x = wc.x = x;
1345         c->oldy = c->y; c->y = wc.y = y;
1346         c->oldw = c->w; c->w = wc.width = w;
1347         c->oldh = c->h; c->h = wc.height = h;
1348         wc.border_width = c->bw;
1349         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1350         configure(c);
1351         XSync(dpy, False);
1352 }
1353
1354 void
1355 resizemouse(const Arg *arg) {
1356         int ocx, ocy;
1357         int nw, nh;
1358         Client *c;
1359         Monitor *m;
1360         XEvent ev;
1361
1362         if(!(c = selmon->sel))
1363                 return;
1364         restack(selmon);
1365         ocx = c->x;
1366         ocy = c->y;
1367         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1368                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1369                 return;
1370         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1371         do {
1372                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1373                 switch(ev.type) {
1374                 case ConfigureRequest:
1375                 case Expose:
1376                 case MapRequest:
1377                         handler[ev.type](&ev);
1378                         break;
1379                 case MotionNotify:
1380                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1381                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1382                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1383                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1384                         {
1385                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1386                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1387                                         togglefloating(NULL);
1388                         }
1389                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1390                                 resize(c, c->x, c->y, nw, nh, True);
1391                         break;
1392                 }
1393         } while(ev.type != ButtonRelease);
1394         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1395         XUngrabPointer(dpy, CurrentTime);
1396         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1397         if((m = ptrtomon(c->x + c->w / 2, c->y + c->h / 2)) != selmon) {
1398                 sendmon(c, m);
1399                 selmon = m;
1400                 focus(NULL);
1401         }
1402 }
1403
1404 void
1405 restack(Monitor *m) {
1406         Client *c;
1407         XEvent ev;
1408         XWindowChanges wc;
1409
1410         drawbar(m);
1411         if(!m->sel)
1412                 return;
1413         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1414                 XRaiseWindow(dpy, m->sel->win);
1415         if(m->lt[m->sellt]->arrange) {
1416                 wc.stack_mode = Below;
1417                 wc.sibling = m->barwin;
1418                 for(c = m->stack; c; c = c->snext)
1419                         if(!c->isfloating && ISVISIBLE(c)) {
1420                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1421                                 wc.sibling = c->win;
1422                         }
1423         }
1424         XSync(dpy, False);
1425         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1426 }
1427
1428 void
1429 run(void) {
1430         XEvent ev;
1431         /* main event loop */
1432         XSync(dpy, False);
1433         while(running && !XNextEvent(dpy, &ev))
1434                 if(handler[ev.type])
1435                         handler[ev.type](&ev); /* call handler */
1436 }
1437
1438 void
1439 scan(void) {
1440         unsigned int i, num;
1441         Window d1, d2, *wins = NULL;
1442         XWindowAttributes wa;
1443
1444         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1445                 for(i = 0; i < num; i++) {
1446                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1447                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1448                                 continue;
1449                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1450                                 manage(wins[i], &wa);
1451                 }
1452                 for(i = 0; i < num; i++) { /* now the transients */
1453                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1454                                 continue;
1455                         if(XGetTransientForHint(dpy, wins[i], &d1)
1456                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1457                                 manage(wins[i], &wa);
1458                 }
1459                 if(wins)
1460                         XFree(wins);
1461         }
1462 }
1463
1464 void
1465 sendmon(Client *c, Monitor *m) {
1466         if(c->mon == m)
1467                 return;
1468         unfocus(c, True);
1469         detach(c);
1470         detachstack(c);
1471         c->mon = m;
1472         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1473         attach(c);
1474         attachstack(c);
1475         focus(NULL);
1476         arrange(NULL);
1477 }
1478
1479 void
1480 setclientstate(Client *c, long state) {
1481         long data[] = { state, None };
1482
1483         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1484                         PropModeReplace, (unsigned char *)data, 2);
1485 }
1486
1487 Bool
1488 sendevent(Client *c, Atom proto) {
1489         int n;
1490         Atom *protocols;
1491         Bool exists = False;
1492         XEvent ev;
1493
1494         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1495                 while(!exists && n--)
1496                         exists = protocols[n] == proto;
1497                 XFree(protocols);
1498         }
1499         if(exists) {
1500                 ev.type = ClientMessage;
1501                 ev.xclient.window = c->win;
1502                 ev.xclient.message_type = wmatom[WMProtocols];
1503                 ev.xclient.format = 32;
1504                 ev.xclient.data.l[0] = proto;
1505                 ev.xclient.data.l[1] = CurrentTime;
1506                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1507         }
1508         return exists;
1509 }
1510
1511 void
1512 setfocus(Client *c) {
1513         if(!c->neverfocus)
1514                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1515         sendevent(c, wmatom[WMTakeFocus]);
1516 }
1517
1518 void
1519 setlayout(const Arg *arg) {
1520         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1521                 selmon->sellt ^= 1;
1522         if(arg && arg->v)
1523                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1524         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1525         if(selmon->sel)
1526                 arrange(selmon);
1527         else
1528                 drawbar(selmon);
1529 }
1530
1531 /* arg > 1.0 will set mfact absolutly */
1532 void
1533 setmfact(const Arg *arg) {
1534         float f;
1535
1536         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1537                 return;
1538         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1539         if(f < 0.1 || f > 0.9)
1540                 return;
1541         selmon->mfact = f;
1542         arrange(selmon);
1543 }
1544
1545 void
1546 setup(void) {
1547         XSetWindowAttributes wa;
1548
1549         /* clean up any zombies immediately */
1550         sigchld(0);
1551
1552         /* init screen */
1553         screen = DefaultScreen(dpy);
1554         root = RootWindow(dpy, screen);
1555         initfont(font);
1556         sw = DisplayWidth(dpy, screen);
1557         sh = DisplayHeight(dpy, screen);
1558         bh = dc.h = dc.font.height + 2;
1559         updategeom();
1560         /* init atoms */
1561         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1562         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1563         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1564         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1565         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1566         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1567         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1568         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1569         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1570         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1571         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1572         /* init cursors */
1573         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1574         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1575         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1576         /* init appearance */
1577         dc.norm[ColBorder] = getcolor(normbordercolor);
1578         dc.norm[ColBG] = getcolor(normbgcolor);
1579         dc.norm[ColFG] = getcolor(normfgcolor);
1580         dc.sel[ColBorder] = getcolor(selbordercolor);
1581         dc.sel[ColBG] = getcolor(selbgcolor);
1582         dc.sel[ColFG] = getcolor(selfgcolor);
1583         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1584         dc.gc = XCreateGC(dpy, root, 0, NULL);
1585         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1586         if(!dc.font.set)
1587                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1588         /* init bars */
1589         updatebars();
1590         updatestatus();
1591         /* EWMH support per view */
1592         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1593                         PropModeReplace, (unsigned char *) netatom, NetLast);
1594         /* select for events */
1595         wa.cursor = cursor[CurNormal];
1596         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1597                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1598                         |PropertyChangeMask;
1599         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1600         XSelectInput(dpy, root, wa.event_mask);
1601         grabkeys();
1602 }
1603
1604 void
1605 showhide(Client *c) {
1606         if(!c)
1607                 return;
1608         if(ISVISIBLE(c)) { /* show clients top down */
1609                 XMoveWindow(dpy, c->win, c->x, c->y);
1610                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1611                         resize(c, c->x, c->y, c->w, c->h, False);
1612                 showhide(c->snext);
1613         }
1614         else { /* hide clients bottom up */
1615                 showhide(c->snext);
1616                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1617         }
1618 }
1619
1620 void
1621 sigchld(int unused) {
1622         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1623                 die("Can't install SIGCHLD handler");
1624         while(0 < waitpid(-1, NULL, WNOHANG));
1625 }
1626
1627 void
1628 spawn(const Arg *arg) {
1629         if(fork() == 0) {
1630                 if(dpy)
1631                         close(ConnectionNumber(dpy));
1632                 setsid();
1633                 execvp(((char **)arg->v)[0], (char **)arg->v);
1634                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1635                 perror(" failed");
1636                 exit(EXIT_SUCCESS);
1637         }
1638 }
1639
1640 void
1641 tag(const Arg *arg) {
1642         if(selmon->sel && arg->ui & TAGMASK) {
1643                 selmon->sel->tags = arg->ui & TAGMASK;
1644                 focus(NULL);
1645                 arrange(selmon);
1646         }
1647 }
1648
1649 void
1650 tagmon(const Arg *arg) {
1651         if(!selmon->sel || !mons->next)
1652                 return;
1653         sendmon(selmon->sel, dirtomon(arg->i));
1654 }
1655
1656 int
1657 textnw(const char *text, unsigned int len) {
1658         XRectangle r;
1659
1660         if(dc.font.set) {
1661                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1662                 return r.width;
1663         }
1664         return XTextWidth(dc.font.xfont, text, len);
1665 }
1666
1667 void
1668 tile(Monitor *m) {
1669         unsigned int i, n, h, mw, my, ty;
1670         Client *c;
1671
1672         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1673         if(n == 0)
1674                 return;
1675
1676         if(n > m->nmaster)
1677                 mw = m->nmaster ? m->ww * m->mfact : 0;
1678         else
1679                 mw = m->ww;
1680         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1681                 if(i < m->nmaster) {
1682                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1683                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1684                         my += HEIGHT(c);
1685                 }
1686                 else {
1687                         h = (m->wh - ty) / (n - i);
1688                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1689                         ty += HEIGHT(c);
1690                 }
1691 }
1692
1693 void
1694 togglebar(const Arg *arg) {
1695         selmon->showbar = !selmon->showbar;
1696         updatebarpos(selmon);
1697         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1698         arrange(selmon);
1699 }
1700
1701 void
1702 togglefloating(const Arg *arg) {
1703         if(!selmon->sel)
1704                 return;
1705         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1706         if(selmon->sel->isfloating)
1707                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1708                        selmon->sel->w, selmon->sel->h, False);
1709         arrange(selmon);
1710 }
1711
1712 void
1713 toggletag(const Arg *arg) {
1714         unsigned int newtags;
1715
1716         if(!selmon->sel)
1717                 return;
1718         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1719         if(newtags) {
1720                 selmon->sel->tags = newtags;
1721                 focus(NULL);
1722                 arrange(selmon);
1723         }
1724 }
1725
1726 void
1727 toggleview(const Arg *arg) {
1728         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1729
1730         if(newtagset) {
1731                 selmon->tagset[selmon->seltags] = newtagset;
1732                 focus(NULL);
1733                 arrange(selmon);
1734         }
1735 }
1736
1737 void
1738 unfocus(Client *c, Bool setfocus) {
1739         if(!c)
1740                 return;
1741         grabbuttons(c, False);
1742         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1743         if(setfocus)
1744                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1745 }
1746
1747 void
1748 unmanage(Client *c, Bool destroyed) {
1749         Monitor *m = c->mon;
1750         XWindowChanges wc;
1751
1752         /* The server grab construct avoids race conditions. */
1753         detach(c);
1754         detachstack(c);
1755         if(!destroyed) {
1756                 wc.border_width = c->oldbw;
1757                 XGrabServer(dpy);
1758                 XSetErrorHandler(xerrordummy);
1759                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1760                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1761                 setclientstate(c, WithdrawnState);
1762                 XSync(dpy, False);
1763                 XSetErrorHandler(xerror);
1764                 XUngrabServer(dpy);
1765         }
1766         free(c);
1767         focus(NULL);
1768         arrange(m);
1769 }
1770
1771 void
1772 unmapnotify(XEvent *e) {
1773         Client *c;
1774         XUnmapEvent *ev = &e->xunmap;
1775
1776         if((c = wintoclient(ev->window))) {
1777                 if(ev->send_event)
1778                         setclientstate(c, WithdrawnState);
1779                 else
1780                         unmanage(c, False);
1781         }
1782 }
1783
1784 void
1785 updatebars(void) {
1786         Monitor *m;
1787         XSetWindowAttributes wa = {
1788                 .override_redirect = True,
1789                 .background_pixmap = ParentRelative,
1790                 .event_mask = ButtonPressMask|ExposureMask
1791         };
1792         for(m = mons; m; m = m->next) {
1793                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1794                                           CopyFromParent, DefaultVisual(dpy, screen),
1795                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1796                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1797                 XMapRaised(dpy, m->barwin);
1798         }
1799 }
1800
1801 void
1802 updatebarpos(Monitor *m) {
1803         m->wy = m->my;
1804         m->wh = m->mh;
1805         if(m->showbar) {
1806                 m->wh -= bh;
1807                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1808                 m->wy = m->topbar ? m->wy + bh : m->wy;
1809         }
1810         else
1811                 m->by = -bh;
1812 }
1813
1814 Bool
1815 updategeom(void) {
1816         Bool dirty = False;
1817
1818 #ifdef XINERAMA
1819         if(XineramaIsActive(dpy)) {
1820                 int i, j, n, nn;
1821                 Client *c;
1822                 Monitor *m;
1823                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1824                 XineramaScreenInfo *unique = NULL;
1825
1826                 for(n = 0, m = mons; m; m = m->next, n++);
1827                 /* only consider unique geometries as separate screens */
1828                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1829                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1830                 for(i = 0, j = 0; i < nn; i++)
1831                         if(isuniquegeom(unique, j, &info[i]))
1832                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1833                 XFree(info);
1834                 nn = j;
1835                 if(n <= nn) {
1836                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1837                                 for(m = mons; m && m->next; m = m->next);
1838                                 if(m)
1839                                         m->next = createmon();
1840                                 else
1841                                         mons = createmon();
1842                         }
1843                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1844                                 if(i >= n
1845                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1846                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1847                                 {
1848                                         dirty = True;
1849                                         m->num = i;
1850                                         m->mx = m->wx = unique[i].x_org;
1851                                         m->my = m->wy = unique[i].y_org;
1852                                         m->mw = m->ww = unique[i].width;
1853                                         m->mh = m->wh = unique[i].height;
1854                                         updatebarpos(m);
1855                                 }
1856                 }
1857                 else { /* less monitors available nn < n */
1858                         for(i = nn; i < n; i++) {
1859                                 for(m = mons; m && m->next; m = m->next);
1860                                 while(m->clients) {
1861                                         dirty = True;
1862                                         c = m->clients;
1863                                         m->clients = c->next;
1864                                         detachstack(c);
1865                                         c->mon = mons;
1866                                         attach(c);
1867                                         attachstack(c);
1868                                 }
1869                                 if(m == selmon)
1870                                         selmon = mons;
1871                                 cleanupmon(m);
1872                         }
1873                 }
1874                 free(unique);
1875         }
1876         else
1877 #endif /* XINERAMA */
1878         /* default monitor setup */
1879         {
1880                 if(!mons)
1881                         mons = createmon();
1882                 if(mons->mw != sw || mons->mh != sh) {
1883                         dirty = True;
1884                         mons->mw = mons->ww = sw;
1885                         mons->mh = mons->wh = sh;
1886                         updatebarpos(mons);
1887                 }
1888         }
1889         if(dirty) {
1890                 selmon = mons;
1891                 selmon = wintomon(root);
1892         }
1893         return dirty;
1894 }
1895
1896 void
1897 updatenumlockmask(void) {
1898         unsigned int i, j;
1899         XModifierKeymap *modmap;
1900
1901         numlockmask = 0;
1902         modmap = XGetModifierMapping(dpy);
1903         for(i = 0; i < 8; i++)
1904                 for(j = 0; j < modmap->max_keypermod; j++)
1905                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1906                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1907                                 numlockmask = (1 << i);
1908         XFreeModifiermap(modmap);
1909 }
1910
1911 void
1912 updatesizehints(Client *c) {
1913         long msize;
1914         XSizeHints size;
1915
1916         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1917                 /* size is uninitialized, ensure that size.flags aren't used */
1918                 size.flags = PSize;
1919         if(size.flags & PBaseSize) {
1920                 c->basew = size.base_width;
1921                 c->baseh = size.base_height;
1922         }
1923         else if(size.flags & PMinSize) {
1924                 c->basew = size.min_width;
1925                 c->baseh = size.min_height;
1926         }
1927         else
1928                 c->basew = c->baseh = 0;
1929         if(size.flags & PResizeInc) {
1930                 c->incw = size.width_inc;
1931                 c->inch = size.height_inc;
1932         }
1933         else
1934                 c->incw = c->inch = 0;
1935         if(size.flags & PMaxSize) {
1936                 c->maxw = size.max_width;
1937                 c->maxh = size.max_height;
1938         }
1939         else
1940                 c->maxw = c->maxh = 0;
1941         if(size.flags & PMinSize) {
1942                 c->minw = size.min_width;
1943                 c->minh = size.min_height;
1944         }
1945         else if(size.flags & PBaseSize) {
1946                 c->minw = size.base_width;
1947                 c->minh = size.base_height;
1948         }
1949         else
1950                 c->minw = c->minh = 0;
1951         if(size.flags & PAspect) {
1952                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1953                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1954         }
1955         else
1956                 c->maxa = c->mina = 0.0;
1957         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1958                      && c->maxw == c->minw && c->maxh == c->minh);
1959 }
1960
1961 void
1962 updatetitle(Client *c) {
1963         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1964                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1965         if(c->name[0] == '\0') /* hack to mark broken clients */
1966                 strcpy(c->name, broken);
1967 }
1968
1969 void
1970 updatestatus(void) {
1971         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1972                 strcpy(stext, "dwm-"VERSION);
1973         drawbar(selmon);
1974 }
1975
1976 void
1977 updatewindowtype(Client *c)
1978 {
1979         Atom wtype, real;
1980         int format;
1981         unsigned long n, extra;
1982         unsigned char *p = NULL;
1983
1984         if(XGetWindowProperty(dpy, c->win, netatom[NetWMWindowType], 0L,
1985                               sizeof(Atom), False, XA_ATOM, &real, &format,
1986                               &n, &extra, (unsigned char **)&p) == Success && p) {
1987                 wtype = *(Atom *)p;
1988                 XFree(p);
1989
1990                 if(wtype == netatom[NetWMWindowTypeDialog])
1991                         c->isfloating = True;
1992         }
1993 }
1994
1995 void
1996 updatewmhints(Client *c) {
1997         XWMHints *wmh;
1998
1999         if((wmh = XGetWMHints(dpy, c->win))) {
2000                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2001                         wmh->flags &= ~XUrgencyHint;
2002                         XSetWMHints(dpy, c->win, wmh);
2003                 }
2004                 else
2005                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2006                 if(wmh->flags & InputHint)
2007                         c->neverfocus = !wmh->input;
2008                 else
2009                         c->neverfocus = False;
2010                 XFree(wmh);
2011         }
2012 }
2013
2014 void
2015 view(const Arg *arg) {
2016         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2017                 return;
2018         selmon->seltags ^= 1; /* toggle sel tagset */
2019         if(arg->ui & TAGMASK)
2020                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2021         focus(NULL);
2022         arrange(selmon);
2023 }
2024
2025 Client *
2026 wintoclient(Window w) {
2027         Client *c;
2028         Monitor *m;
2029
2030         for(m = mons; m; m = m->next)
2031                 for(c = m->clients; c; c = c->next)
2032                         if(c->win == w)
2033                                 return c;
2034         return NULL;
2035 }
2036
2037 Monitor *
2038 wintomon(Window w) {
2039         int x, y;
2040         Client *c;
2041         Monitor *m;
2042
2043         if(w == root && getrootptr(&x, &y))
2044                 return ptrtomon(x, y);
2045         for(m = mons; m; m = m->next)
2046                 if(w == m->barwin)
2047                         return m;
2048         if((c = wintoclient(w)))
2049                 return c->mon;
2050         return selmon;
2051 }
2052
2053 /* There's no way to check accesses to destroyed windows, thus those cases are
2054  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2055  * default error handler, which may call exit.  */
2056 int
2057 xerror(Display *dpy, XErrorEvent *ee) {
2058         if(ee->error_code == BadWindow
2059         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2060         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2061         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2062         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2063         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2064         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2065         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2066         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2067                 return 0;
2068         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2069                         ee->request_code, ee->error_code);
2070         return xerrorxlib(dpy, ee); /* may call exit */
2071 }
2072
2073 int
2074 xerrordummy(Display *dpy, XErrorEvent *ee) {
2075         return 0;
2076 }
2077
2078 /* Startup Error handler to check if another window manager
2079  * is already running. */
2080 int
2081 xerrorstart(Display *dpy, XErrorEvent *ee) {
2082         die("dwm: another window manager is already running\n");
2083         return -1;
2084 }
2085
2086 void
2087 zoom(const Arg *arg) {
2088         Client *c = selmon->sel;
2089
2090         if(!selmon->lt[selmon->sellt]->arrange
2091         || (selmon->sel && selmon->sel->isfloating))
2092                 return;
2093         if(c == nexttiled(selmon->clients))
2094                 if(!c || !(c = nexttiled(c->next)))
2095                         return;
2096         pop(c);
2097 }
2098
2099 int
2100 main(int argc, char *argv[]) {
2101         if(argc == 2 && !strcmp("-v", argv[1]))
2102                 die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2103         else if(argc != 1)
2104                 die("usage: dwm [-v]\n");
2105         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2106                 fputs("warning: no locale support\n", stderr);
2107         if(!(dpy = XOpenDisplay(NULL)))
2108                 die("dwm: cannot open display\n");
2109         checkotherwm();
2110         setup();
2111         scan();
2112         run();
2113         cleanup();
2114         XCloseDisplay(dpy);
2115         return EXIT_SUCCESS;
2116 }