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 INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49 #define LENGTH(X)               (sizeof X / sizeof X[0])
  50 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58 /* enums */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetWMState,
  62        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63        NetWMWindowTypeDialog, NetLast };     /* EWMH atoms */
  64 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68 typedef union {
  69         int i;
  70         unsigned int ui;
  71         float f;
  72         const void *v;
  73 } Arg;
  74
  75 typedef struct {
  76         unsigned int click;
  77         unsigned int mask;
  78         unsigned int button;
  79         void (*func)(const Arg *arg);
  80         const Arg arg;
  81 } Button;
  82
  83 typedef struct Monitor Monitor;
  84 typedef struct Client Client;
  85 struct Client {
  86         char name[256];
  87         float mina, maxa;
  88         int x, y, w, h;
  89         int oldx, oldy, oldw, oldh;
  90         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91         int bw, oldbw;
  92         unsigned int tags;
  93         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94         Client *next;
  95         Client *snext;
  96         Monitor *mon;
  97         Window win;
  98 };
  99
 100 typedef struct {
 101         int x, y, w, h;
 102         unsigned long norm[ColLast];
 103         unsigned long sel[ColLast];
 104         Drawable drawable;
 105         GC gc;
 106         struct {
 107                 int ascent;
 108                 int descent;
 109                 int height;
 110                 XFontSet set;
 111                 XFontStruct *xfont;
 112         } font;
 113 } DC; /* draw context */
 114
 115 typedef struct {
 116         unsigned int mod;
 117         KeySym keysym;
 118         void (*func)(const Arg *);
 119         const Arg arg;
 120 } Key;
 121
 122 typedef struct {
 123         const char *symbol;
 124         void (*arrange)(Monitor *);
 125 } Layout;
 126
 127 struct Monitor {
 128         char ltsymbol[16];
 129         float mfact;
 130         int nmaster;
 131         int num;
 132         int by;               /* bar geometry */
 133         int mx, my, mw, mh;   /* screen size */
 134         int wx, wy, ww, wh;   /* window area  */
 135         unsigned int seltags;
 136         unsigned int sellt;
 137         unsigned int tagset[2];
 138         Bool showbar;
 139         Bool topbar;
 140         Client *clients;
 141         Client *sel;
 142         Client *stack;
 143         Monitor *next;
 144         Window barwin;
 145         const Layout *lt[2];
 146 };
 147
 148 typedef struct {
 149         const char *class;
 150         const char *instance;
 151         const char *title;
 152         unsigned int tags;
 153         Bool isfloating;
 154         int monitor;
 155 } Rule;
 156
 157 /* function declarations */
 158 static void applyrules(Client *c);
 159 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160 static void arrange(Monitor *m);
 161 static void arrangemon(Monitor *m);
 162 static void attach(Client *c);
 163 static void attachstack(Client *c);
 164 static void buttonpress(XEvent *e);
 165 static void checkotherwm(void);
 166 static void cleanup(void);
 167 static void cleanupmon(Monitor *mon);
 168 static void clearurgent(Client *c);
 169 static void clientmessage(XEvent *e);
 170 static void configure(Client *c);
 171 static void configurenotify(XEvent *e);
 172 static void configurerequest(XEvent *e);
 173 static Monitor *createmon(void);
 174 static void destroynotify(XEvent *e);
 175 static void detach(Client *c);
 176 static void detachstack(Client *c);
 177 static void die(const char *errstr, ...);
 178 static Monitor *dirtomon(int dir);
 179 static void drawbar(Monitor *m);
 180 static void drawbars(void);
 181 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183 static void enternotify(XEvent *e);
 184 static void expose(XEvent *e);
 185 static void focus(Client *c);
 186 static void focusin(XEvent *e);
 187 static void focusmon(const Arg *arg);
 188 static void focusstack(const Arg *arg);
 189 static unsigned long getcolor(const char *colstr);
 190 static Bool getrootptr(int *x, int *y);
 191 static long getstate(Window w);
 192 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193 static void grabbuttons(Client *c, Bool focused);
 194 static void grabkeys(void);
 195 static void incnmaster(const Arg *arg);
 196 static void initfont(const char *fontstr);
 197 static void keypress(XEvent *e);
 198 static void killclient(const Arg *arg);
 199 static void manage(Window w, XWindowAttributes *wa);
 200 static void mappingnotify(XEvent *e);
 201 static void maprequest(XEvent *e);
 202 static void monocle(Monitor *m);
 203 static void movemouse(const Arg *arg);
 204 static Client *nexttiled(Client *c);
 205 static void pop(Client *);
 206 static void propertynotify(XEvent *e);
 207 static void quit(const Arg *arg);
 208 static Monitor *recttomon(int x, int y, int w, int h);
 209 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 210 static void resizeclient(Client *c, int x, int y, int w, int h);
 211 static void resizemouse(const Arg *arg);
 212 static void restack(Monitor *m);
 213 static void run(void);
 214 static void scan(void);
 215 static Bool sendevent(Client *c, Atom proto);
 216 static void sendmon(Client *c, Monitor *m);
 217 static void setclientstate(Client *c, long state);
 218 static void setfocus(Client *c);
 219 static void setfullscreen(Client *c, Bool fullscreen);
 220 static void setlayout(const Arg *arg);
 221 static void setmfact(const Arg *arg);
 222 static void setup(void);
 223 static void showhide(Client *c);
 224 static void sigchld(int unused);
 225 static void spawn(const Arg *arg);
 226 static void tag(const Arg *arg);
 227 static void tagmon(const Arg *arg);
 228 static int textnw(const char *text, unsigned int len);
 229 static void tile(Monitor *);
 230 static void togglebar(const Arg *arg);
 231 static void togglefloating(const Arg *arg);
 232 static void toggletag(const Arg *arg);
 233 static void toggleview(const Arg *arg);
 234 static void unfocus(Client *c, Bool setfocus);
 235 static void unmanage(Client *c, Bool destroyed);
 236 static void unmapnotify(XEvent *e);
 237 static Bool updategeom(void);
 238 static void updatebarpos(Monitor *m);
 239 static void updatebars(void);
 240 static void updatenumlockmask(void);
 241 static void updatesizehints(Client *c);
 242 static void updatestatus(void);
 243 static void updatewindowtype(Client *c);
 244 static void updatetitle(Client *c);
 245 static void updatewmhints(Client *c);
 246 static void view(const Arg *arg);
 247 static Client *wintoclient(Window w);
 248 static Monitor *wintomon(Window w);
 249 static int xerror(Display *dpy, XErrorEvent *ee);
 250 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 251 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 252 static void zoom(const Arg *arg);
 253
 254 /* variables */
 255 static const char broken[] = "broken";
 256 static char stext[256];
 257 static int screen;
 258 static int sw, sh;           /* X display screen geometry width, height */
 259 static int bh, blw = 0;      /* bar geometry */
 260 static int (*xerrorxlib)(Display *, XErrorEvent *);
 261 static unsigned int numlockmask = 0;
 262 static void (*handler[LASTEvent]) (XEvent *) = {
 263         [ButtonPress] = buttonpress,
 264         [ClientMessage] = clientmessage,
 265         [ConfigureRequest] = configurerequest,
 266         [ConfigureNotify] = configurenotify,
 267         [DestroyNotify] = destroynotify,
 268         [EnterNotify] = enternotify,
 269         [Expose] = expose,
 270         [FocusIn] = focusin,
 271         [KeyPress] = keypress,
 272         [MappingNotify] = mappingnotify,
 273         [MapRequest] = maprequest,
 274         [PropertyNotify] = propertynotify,
 275         [UnmapNotify] = unmapnotify
 276 };
 277 static Atom wmatom[WMLast], netatom[NetLast];
 278 static Bool running = True;
 279 static Cursor cursor[CurLast];
 280 static Display *dpy;
 281 static DC dc;
 282 static Monitor *mons = NULL, *selmon = NULL;
 283 static Window root;
 284
 285 /* configuration, allows nested code to access above variables */
 286 #include "config.h"
 287
 288 /* compile-time check if all tags fit into an unsigned int bit array. */
 289 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 290
 291 /* function implementations */
 292 void
 293 applyrules(Client *c) {
 294         const char *class, *instance;
 295         unsigned int i;
 296         const Rule *r;
 297         Monitor *m;
 298         XClassHint ch = { NULL, NULL };
 299
 300         /* rule matching */
 301         c->isfloating = c->tags = 0;
 302         XGetClassHint(dpy, c->win, &ch);
 303         class    = ch.res_class ? ch.res_class : broken;
 304         instance = ch.res_name  ? ch.res_name  : broken;
 305
 306         for(i = 0; i < LENGTH(rules); i++) {
 307                 r = &rules[i];
 308                 if((!r->title || strstr(c->name, r->title))
 309                 && (!r->class || strstr(class, r->class))
 310                 && (!r->instance || strstr(instance, r->instance)))
 311                 {
 312                         c->isfloating = r->isfloating;
 313                         c->tags |= r->tags;
 314                         for(m = mons; m && m->num != r->monitor; m = m->next);
 315                         if(m)
 316                                 c->mon = m;
 317                 }
 318         }
 319         if(ch.res_class)
 320                 XFree(ch.res_class);
 321         if(ch.res_name)
 322                 XFree(ch.res_name);
 323         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 324 }
 325
 326 Bool
 327 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 328         Bool baseismin;
 329         Monitor *m = c->mon;
 330
 331         /* set minimum possible */
 332         *w = MAX(1, *w);
 333         *h = MAX(1, *h);
 334         if(interact) {
 335                 if(*x > sw)
 336                         *x = sw - WIDTH(c);
 337                 if(*y > sh)
 338                         *y = sh - HEIGHT(c);
 339                 if(*x + *w + 2 * c->bw < 0)
 340                         *x = 0;
 341                 if(*y + *h + 2 * c->bw < 0)
 342                         *y = 0;
 343         }
 344         else {
 345                 if(*x >= m->wx + m->ww)
 346                         *x = m->wx + m->ww - WIDTH(c);
 347                 if(*y >= m->wy + m->wh)
 348                         *y = m->wy + m->wh - HEIGHT(c);
 349                 if(*x + *w + 2 * c->bw <= m->wx)
 350                         *x = m->wx;
 351                 if(*y + *h + 2 * c->bw <= m->wy)
 352                         *y = m->wy;
 353         }
 354         if(*h < bh)
 355                 *h = bh;
 356         if(*w < bh)
 357                 *w = bh;
 358         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 359                 /* see last two sentences in ICCCM 4.1.2.3 */
 360                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 361                 if(!baseismin) { /* temporarily remove base dimensions */
 362                         *w -= c->basew;
 363                         *h -= c->baseh;
 364                 }
 365                 /* adjust for aspect limits */
 366                 if(c->mina > 0 && c->maxa > 0) {
 367                         if(c->maxa < (float)*w / *h)
 368                                 *w = *h * c->maxa + 0.5;
 369                         else if(c->mina < (float)*h / *w)
 370                                 *h = *w * c->mina + 0.5;
 371                 }
 372                 if(baseismin) { /* increment calculation requires this */
 373                         *w -= c->basew;
 374                         *h -= c->baseh;
 375                 }
 376                 /* adjust for increment value */
 377                 if(c->incw)
 378                         *w -= *w % c->incw;
 379                 if(c->inch)
 380                         *h -= *h % c->inch;
 381                 /* restore base dimensions */
 382                 *w = MAX(*w + c->basew, c->minw);
 383                 *h = MAX(*h + c->baseh, c->minh);
 384                 if(c->maxw)
 385                         *w = MIN(*w, c->maxw);
 386                 if(c->maxh)
 387                         *h = MIN(*h, c->maxh);
 388         }
 389         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 390 }
 391
 392 void
 393 arrange(Monitor *m) {
 394         if(m)
 395                 showhide(m->stack);
 396         else for(m = mons; m; m = m->next)
 397                 showhide(m->stack);
 398         if(m)
 399                 arrangemon(m);
 400         else for(m = mons; m; m = m->next)
 401                 arrangemon(m);
 402 }
 403
 404 void
 405 arrangemon(Monitor *m) {
 406         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 407         if(m->lt[m->sellt]->arrange)
 408                 m->lt[m->sellt]->arrange(m);
 409         restack(m);
 410 }
 411
 412 void
 413 attach(Client *c) {
 414         c->next = c->mon->clients;
 415         c->mon->clients = c;
 416 }
 417
 418 void
 419 attachstack(Client *c) {
 420         c->snext = c->mon->stack;
 421         c->mon->stack = c;
 422 }
 423
 424 void
 425 buttonpress(XEvent *e) {
 426         unsigned int i, x, click;
 427         Arg arg = {0};
 428         Client *c;
 429         Monitor *m;
 430         XButtonPressedEvent *ev = &e->xbutton;
 431
 432         click = ClkRootWin;
 433         /* focus monitor if necessary */
 434         if((m = wintomon(ev->window)) && m != selmon) {
 435                 unfocus(selmon->sel, True);
 436                 selmon = m;
 437                 focus(NULL);
 438         }
 439         if(ev->window == selmon->barwin) {
 440                 i = x = 0;
 441                 do
 442                         x += TEXTW(tags[i]);
 443                 while(ev->x >= x && ++i < LENGTH(tags));
 444                 if(i < LENGTH(tags)) {
 445                         click = ClkTagBar;
 446                         arg.ui = 1 << i;
 447                 }
 448                 else if(ev->x < x + blw)
 449                         click = ClkLtSymbol;
 450                 else if(ev->x > selmon->ww - TEXTW(stext))
 451                         click = ClkStatusText;
 452                 else
 453                         click = ClkWinTitle;
 454         }
 455         else if((c = wintoclient(ev->window))) {
 456                 focus(c);
 457                 click = ClkClientWin;
 458         }
 459         for(i = 0; i < LENGTH(buttons); i++)
 460                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 461                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 462                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 463 }
 464
 465 void
 466 checkotherwm(void) {
 467         xerrorxlib = XSetErrorHandler(xerrorstart);
 468         /* this causes an error if some other window manager is running */
 469         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 470         XSync(dpy, False);
 471         XSetErrorHandler(xerror);
 472         XSync(dpy, False);
 473 }
 474
 475 void
 476 cleanup(void) {
 477         Arg a = {.ui = ~0};
 478         Layout foo = { "", NULL };
 479         Monitor *m;
 480
 481         view(&a);
 482         selmon->lt[selmon->sellt] = &foo;
 483         for(m = mons; m; m = m->next)
 484                 while(m->stack)
 485                         unmanage(m->stack, False);
 486         if(dc.font.set)
 487                 XFreeFontSet(dpy, dc.font.set);
 488         else
 489                 XFreeFont(dpy, dc.font.xfont);
 490         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 491         XFreePixmap(dpy, dc.drawable);
 492         XFreeGC(dpy, dc.gc);
 493         XFreeCursor(dpy, cursor[CurNormal]);
 494         XFreeCursor(dpy, cursor[CurResize]);
 495         XFreeCursor(dpy, cursor[CurMove]);
 496         while(mons)
 497                 cleanupmon(mons);
 498         XSync(dpy, False);
 499         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 500 }
 501
 502 void
 503 cleanupmon(Monitor *mon) {
 504         Monitor *m;
 505
 506         if(mon == mons)
 507                 mons = mons->next;
 508         else {
 509                 for(m = mons; m && m->next != mon; m = m->next);
 510                 m->next = mon->next;
 511         }
 512         XUnmapWindow(dpy, mon->barwin);
 513         XDestroyWindow(dpy, mon->barwin);
 514         free(mon);
 515 }
 516
 517 void
 518 clearurgent(Client *c) {
 519         XWMHints *wmh;
 520
 521         c->isurgent = False;
 522         if(!(wmh = XGetWMHints(dpy, c->win)))
 523                 return;
 524         wmh->flags &= ~XUrgencyHint;
 525         XSetWMHints(dpy, c->win, wmh);
 526         XFree(wmh);
 527 }
 528
 529 void
 530 clientmessage(XEvent *e) {
 531         XClientMessageEvent *cme = &e->xclient;
 532         Client *c = wintoclient(cme->window);
 533
 534         if(!c)
 535                 return;
 536         if(cme->message_type == netatom[NetWMState]) {
 537                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 538                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 539                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 540         }
 541         else if(cme->message_type == netatom[NetActiveWindow]) {
 542                 if(!ISVISIBLE(c)) {
 543                         c->mon->seltags ^= 1;
 544                         c->mon->tagset[c->mon->seltags] = c->tags;
 545                 }
 546                 pop(c);
 547         }
 548 }
 549
 550 void
 551 configure(Client *c) {
 552         XConfigureEvent ce;
 553
 554         ce.type = ConfigureNotify;
 555         ce.display = dpy;
 556         ce.event = c->win;
 557         ce.window = c->win;
 558         ce.x = c->x;
 559         ce.y = c->y;
 560         ce.width = c->w;
 561         ce.height = c->h;
 562         ce.border_width = c->bw;
 563         ce.above = None;
 564         ce.override_redirect = False;
 565         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 566 }
 567
 568 void
 569 configurenotify(XEvent *e) {
 570         Monitor *m;
 571         XConfigureEvent *ev = &e->xconfigure;
 572         Bool dirty;
 573
 574         if(ev->window == root) {
 575                 dirty = (sw != ev->width);
 576                 sw = ev->width;
 577                 sh = ev->height;
 578                 if(updategeom() || dirty) {
 579                         if(dc.drawable != 0)
 580                                 XFreePixmap(dpy, dc.drawable);
 581                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 582                         updatebars();
 583                         for(m = mons; m; m = m->next)
 584                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 585                         focus(NULL);
 586                         arrange(NULL);
 587                 }
 588         }
 589 }
 590
 591 void
 592 configurerequest(XEvent *e) {
 593         Client *c;
 594         Monitor *m;
 595         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 596         XWindowChanges wc;
 597
 598         if((c = wintoclient(ev->window))) {
 599                 if(ev->value_mask & CWBorderWidth)
 600                         c->bw = ev->border_width;
 601                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 602                         m = c->mon;
 603                         if(ev->value_mask & CWX) {
 604                                 c->oldx = c->x;
 605                                 c->x = m->mx + ev->x;
 606                         }
 607                         if(ev->value_mask & CWY) {
 608                                 c->oldy = c->y;
 609                                 c->y = m->my + ev->y;
 610                         }
 611                         if(ev->value_mask & CWWidth) {
 612                                 c->oldw = c->w;
 613                                 c->w = ev->width;
 614                         }
 615                         if(ev->value_mask & CWHeight) {
 616                                 c->oldh = c->h;
 617                                 c->h = ev->height;
 618                         }
 619                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 620                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 621                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 622                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 623                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 624                                 configure(c);
 625                         if(ISVISIBLE(c))
 626                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 627                 }
 628                 else
 629                         configure(c);
 630         }
 631         else {
 632                 wc.x = ev->x;
 633                 wc.y = ev->y;
 634                 wc.width = ev->width;
 635                 wc.height = ev->height;
 636                 wc.border_width = ev->border_width;
 637                 wc.sibling = ev->above;
 638                 wc.stack_mode = ev->detail;
 639                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 640         }
 641         XSync(dpy, False);
 642 }
 643
 644 Monitor *
 645 createmon(void) {
 646         Monitor *m;
 647
 648         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 649                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 650         m->tagset[0] = m->tagset[1] = 1;
 651         m->mfact = mfact;
 652         m->nmaster = nmaster;
 653         m->showbar = showbar;
 654         m->topbar = topbar;
 655         m->lt[0] = &layouts[0];
 656         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 657         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 658         return m;
 659 }
 660
 661 void
 662 destroynotify(XEvent *e) {
 663         Client *c;
 664         XDestroyWindowEvent *ev = &e->xdestroywindow;
 665
 666         if((c = wintoclient(ev->window)))
 667                 unmanage(c, True);
 668 }
 669
 670 void
 671 detach(Client *c) {
 672         Client **tc;
 673
 674         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 675         *tc = c->next;
 676 }
 677
 678 void
 679 detachstack(Client *c) {
 680         Client **tc, *t;
 681
 682         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 683         *tc = c->snext;
 684
 685         if(c == c->mon->sel) {
 686                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 687                 c->mon->sel = t;
 688         }
 689 }
 690
 691 void
 692 die(const char *errstr, ...) {
 693         va_list ap;
 694
 695         va_start(ap, errstr);
 696         vfprintf(stderr, errstr, ap);
 697         va_end(ap);
 698         exit(EXIT_FAILURE);
 699 }
 700
 701 Monitor *
 702 dirtomon(int dir) {
 703         Monitor *m = NULL;
 704
 705         if(dir > 0) {
 706                 if(!(m = selmon->next))
 707                         m = mons;
 708         }
 709         else if(selmon == mons)
 710                 for(m = mons; m->next; m = m->next);
 711         else
 712                 for(m = mons; m->next != selmon; m = m->next);
 713         return m;
 714 }
 715
 716 void
 717 drawbar(Monitor *m) {
 718         int x;
 719         unsigned int i, occ = 0, urg = 0;
 720         unsigned long *col;
 721         Client *c;
 722
 723         for(c = m->clients; c; c = c->next) {
 724                 occ |= c->tags;
 725                 if(c->isurgent)
 726                         urg |= c->tags;
 727         }
 728         dc.x = 0;
 729         for(i = 0; i < LENGTH(tags); i++) {
 730                 dc.w = TEXTW(tags[i]);
 731                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 732                 drawtext(tags[i], col, urg & 1 << i);
 733                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 734                            occ & 1 << i, urg & 1 << i, col);
 735                 dc.x += dc.w;
 736         }
 737         dc.w = blw = TEXTW(m->ltsymbol);
 738         drawtext(m->ltsymbol, dc.norm, False);
 739         dc.x += dc.w;
 740         x = dc.x;
 741         if(m == selmon) { /* status is only drawn on selected monitor */
 742                 dc.w = TEXTW(stext);
 743                 dc.x = m->ww - dc.w;
 744                 if(dc.x < x) {
 745                         dc.x = x;
 746                         dc.w = m->ww - x;
 747                 }
 748                 drawtext(stext, dc.norm, False);
 749         }
 750         else
 751                 dc.x = m->ww;
 752         if((dc.w = dc.x - x) > bh) {
 753                 dc.x = x;
 754                 if(m->sel) {
 755                         col = m == selmon ? dc.sel : dc.norm;
 756                         drawtext(m->sel->name, col, False);
 757                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 758                 }
 759                 else
 760                         drawtext(NULL, dc.norm, False);
 761         }
 762         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 763         XSync(dpy, False);
 764 }
 765
 766 void
 767 drawbars(void) {
 768         Monitor *m;
 769
 770         for(m = mons; m; m = m->next)
 771                 drawbar(m);
 772 }
 773
 774 void
 775 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 776         int x;
 777
 778         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 779         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 780         if(filled)
 781                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 782         else if(empty)
 783                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 784 }
 785
 786 void
 787 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 788         char buf[256];
 789         int i, x, y, h, len, olen;
 790
 791         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 792         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 793         if(!text)
 794                 return;
 795         olen = strlen(text);
 796         h = dc.font.ascent + dc.font.descent;
 797         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 798         x = dc.x + (h / 2);
 799         /* shorten text if necessary */
 800         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 801         if(!len)
 802                 return;
 803         memcpy(buf, text, len);
 804         if(len < olen)
 805                 for(i = len; i && i > len - 3; buf[--i] = '.');
 806         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 807         if(dc.font.set)
 808                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 809         else
 810                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 811 }
 812
 813 void
 814 enternotify(XEvent *e) {
 815         Client *c;
 816         Monitor *m;
 817         XCrossingEvent *ev = &e->xcrossing;
 818
 819         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 820                 return;
 821         c = wintoclient(ev->window);
 822         m = c ? c->mon : wintomon(ev->window);
 823         if(m != selmon) {
 824                 unfocus(selmon->sel, True);
 825                 selmon = m;
 826         }
 827         else if(!c || c == selmon->sel)
 828                 return;
 829         focus(c);
 830 }
 831
 832 void
 833 expose(XEvent *e) {
 834         Monitor *m;
 835         XExposeEvent *ev = &e->xexpose;
 836
 837         if(ev->count == 0 && (m = wintomon(ev->window)))
 838                 drawbar(m);
 839 }
 840
 841 void
 842 focus(Client *c) {
 843         if(!c || !ISVISIBLE(c))
 844                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 845         /* was if(selmon->sel) */
 846         if(selmon->sel && selmon->sel != c)
 847                 unfocus(selmon->sel, False);
 848         if(c) {
 849                 if(c->mon != selmon)
 850                         selmon = c->mon;
 851                 if(c->isurgent)
 852                         clearurgent(c);
 853                 detachstack(c);
 854                 attachstack(c);
 855                 grabbuttons(c, True);
 856                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 857                 setfocus(c);
 858         }
 859         else
 860                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 861         selmon->sel = c;
 862         drawbars();
 863 }
 864
 865 void
 866 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 867         XFocusChangeEvent *ev = &e->xfocus;
 868
 869         if(selmon->sel && ev->window != selmon->sel->win)
 870                 setfocus(selmon->sel);
 871 }
 872
 873 void
 874 focusmon(const Arg *arg) {
 875         Monitor *m;
 876
 877         if(!mons->next)
 878                 return;
 879         if((m = dirtomon(arg->i)) == selmon)
 880                 return;
 881         unfocus(selmon->sel, True);
 882         selmon = m;
 883         focus(NULL);
 884 }
 885
 886 void
 887 focusstack(const Arg *arg) {
 888         Client *c = NULL, *i;
 889
 890         if(!selmon->sel)
 891                 return;
 892         if(arg->i > 0) {
 893                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 894                 if(!c)
 895                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 896         }
 897         else {
 898                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 899                         if(ISVISIBLE(i))
 900                                 c = i;
 901                 if(!c)
 902                         for(; i; i = i->next)
 903                                 if(ISVISIBLE(i))
 904                                         c = i;
 905         }
 906         if(c) {
 907                 focus(c);
 908                 restack(selmon);
 909         }
 910 }
 911
 912 Atom
 913 getatomprop(Client *c, Atom prop) {
 914         int di;
 915         unsigned long dl;
 916         unsigned char *p = NULL;
 917         Atom da, atom = None;
 918
 919         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 920                               &da, &di, &dl, &dl, &p) == Success && p) {
 921                 atom = *(Atom *)p;
 922                 XFree(p);
 923         }
 924         return atom;
 925 }
 926
 927 unsigned long
 928 getcolor(const char *colstr) {
 929         Colormap cmap = DefaultColormap(dpy, screen);
 930         XColor color;
 931
 932         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 933                 die("error, cannot allocate color '%s'\n", colstr);
 934         return color.pixel;
 935 }
 936
 937 Bool
 938 getrootptr(int *x, int *y) {
 939         int di;
 940         unsigned int dui;
 941         Window dummy;
 942
 943         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 944 }
 945
 946 long
 947 getstate(Window w) {
 948         int format;
 949         long result = -1;
 950         unsigned char *p = NULL;
 951         unsigned long n, extra;
 952         Atom real;
 953
 954         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 955                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 956                 return -1;
 957         if(n != 0)
 958                 result = *p;
 959         XFree(p);
 960         return result;
 961 }
 962
 963 Bool
 964 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 965         char **list = NULL;
 966         int n;
 967         XTextProperty name;
 968
 969         if(!text || size == 0)
 970                 return False;
 971         text[0] = '\0';
 972         XGetTextProperty(dpy, w, &name, atom);
 973         if(!name.nitems)
 974                 return False;
 975         if(name.encoding == XA_STRING)
 976                 strncpy(text, (char *)name.value, size - 1);
 977         else {
 978                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 979                         strncpy(text, *list, size - 1);
 980                         XFreeStringList(list);
 981                 }
 982         }
 983         text[size - 1] = '\0';
 984         XFree(name.value);
 985         return True;
 986 }
 987
 988 void
 989 grabbuttons(Client *c, Bool focused) {
 990         updatenumlockmask();
 991         {
 992                 unsigned int i, j;
 993                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 994                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 995                 if(focused) {
 996                         for(i = 0; i < LENGTH(buttons); i++)
 997                                 if(buttons[i].click == ClkClientWin)
 998                                         for(j = 0; j < LENGTH(modifiers); j++)
 999                                                 XGrabButton(dpy, buttons[i].button,
1000                                                             buttons[i].mask | modifiers[j],
1001                                                             c->win, False, BUTTONMASK,
1002                                                             GrabModeAsync, GrabModeSync, None, None);
1003                 }
1004                 else
1005                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1006                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1007         }
1008 }
1009
1010 void
1011 grabkeys(void) {
1012         updatenumlockmask();
1013         {
1014                 unsigned int i, j;
1015                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1016                 KeyCode code;
1017
1018                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1019                 for(i = 0; i < LENGTH(keys); i++)
1020                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1021                                 for(j = 0; j < LENGTH(modifiers); j++)
1022                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1023                                                  True, GrabModeAsync, GrabModeAsync);
1024         }
1025 }
1026
1027 void
1028 incnmaster(const Arg *arg) {
1029         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1030         arrange(selmon);
1031 }
1032
1033 void
1034 initfont(const char *fontstr) {
1035         char *def, **missing;
1036         int n;
1037
1038         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1039         if(missing) {
1040                 while(n--)
1041                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1042                 XFreeStringList(missing);
1043         }
1044         if(dc.font.set) {
1045                 XFontStruct **xfonts;
1046                 char **font_names;
1047
1048                 dc.font.ascent = dc.font.descent = 0;
1049                 XExtentsOfFontSet(dc.font.set);
1050                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1051                 while(n--) {
1052                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1053                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1054                         xfonts++;
1055                 }
1056         }
1057         else {
1058                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1059                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1060                         die("error, cannot load font: '%s'\n", fontstr);
1061                 dc.font.ascent = dc.font.xfont->ascent;
1062                 dc.font.descent = dc.font.xfont->descent;
1063         }
1064         dc.font.height = dc.font.ascent + dc.font.descent;
1065 }
1066
1067 #ifdef XINERAMA
1068 static Bool
1069 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1070         while(n--)
1071                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1072                 && unique[n].width == info->width && unique[n].height == info->height)
1073                         return False;
1074         return True;
1075 }
1076 #endif /* XINERAMA */
1077
1078 void
1079 keypress(XEvent *e) {
1080         unsigned int i;
1081         KeySym keysym;
1082         XKeyEvent *ev;
1083
1084         ev = &e->xkey;
1085         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1086         for(i = 0; i < LENGTH(keys); i++)
1087                 if(keysym == keys[i].keysym
1088                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1089                 && keys[i].func)
1090                         keys[i].func(&(keys[i].arg));
1091 }
1092
1093 void
1094 killclient(const Arg *arg) {
1095         if(!selmon->sel)
1096                 return;
1097         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1098                 XGrabServer(dpy);
1099                 XSetErrorHandler(xerrordummy);
1100                 XSetCloseDownMode(dpy, DestroyAll);
1101                 XKillClient(dpy, selmon->sel->win);
1102                 XSync(dpy, False);
1103                 XSetErrorHandler(xerror);
1104                 XUngrabServer(dpy);
1105         }
1106 }
1107
1108 void
1109 manage(Window w, XWindowAttributes *wa) {
1110         Client *c, *t = NULL;
1111         Window trans = None;
1112         XWindowChanges wc;
1113
1114         if(!(c = calloc(1, sizeof(Client))))
1115                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1116         c->win = w;
1117         updatetitle(c);
1118         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1119                 c->mon = t->mon;
1120                 c->tags = t->tags;
1121         }
1122         else {
1123                 c->mon = selmon;
1124                 applyrules(c);
1125         }
1126         /* geometry */
1127         c->x = c->oldx = wa->x;
1128         c->y = c->oldy = wa->y;
1129         c->w = c->oldw = wa->width;
1130         c->h = c->oldh = wa->height;
1131         c->oldbw = wa->border_width;
1132
1133         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1134                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1135         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1136                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1137         c->x = MAX(c->x, c->mon->mx);
1138         /* only fix client y-offset, if the client center might cover the bar */
1139         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1140                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1141         c->bw = borderpx;
1142
1143         wc.border_width = c->bw;
1144         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1145         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1146         configure(c); /* propagates border_width, if size doesn't change */
1147         updatewindowtype(c);
1148         updatesizehints(c);
1149         updatewmhints(c);
1150         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1151         grabbuttons(c, False);
1152         if(!c->isfloating)
1153                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1154         if(c->isfloating)
1155                 XRaiseWindow(dpy, c->win);
1156         attach(c);
1157         attachstack(c);
1158         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1159         setclientstate(c, NormalState);
1160         if (c->mon == selmon)
1161                 unfocus(selmon->sel, False);
1162         c->mon->sel = c;
1163         arrange(c->mon);
1164         XMapWindow(dpy, c->win);
1165         focus(NULL);
1166 }
1167
1168 void
1169 mappingnotify(XEvent *e) {
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         static XWindowAttributes wa;
1180         XMapRequestEvent *ev = &e->xmaprequest;
1181
1182         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1183                 return;
1184         if(wa.override_redirect)
1185                 return;
1186         if(!wintoclient(ev->window))
1187                 manage(ev->window, &wa);
1188 }
1189
1190 void
1191 monocle(Monitor *m) {
1192         unsigned int n = 0;
1193         Client *c;
1194
1195         for(c = m->clients; c; c = c->next)
1196                 if(ISVISIBLE(c))
1197                         n++;
1198         if(n > 0) /* override layout symbol */
1199                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1200         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1201                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1202 }
1203
1204 void
1205 movemouse(const Arg *arg) {
1206         int x, y, ocx, ocy, nx, ny;
1207         Client *c;
1208         Monitor *m;
1209         XEvent ev;
1210
1211         if(!(c = selmon->sel))
1212                 return;
1213         restack(selmon);
1214         ocx = c->x;
1215         ocy = c->y;
1216         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1217         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1218                 return;
1219         if(!getrootptr(&x, &y))
1220                 return;
1221         do {
1222                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1223                 switch(ev.type) {
1224                 case ConfigureRequest:
1225                 case Expose:
1226                 case MapRequest:
1227                         handler[ev.type](&ev);
1228                         break;
1229                 case MotionNotify:
1230                         nx = ocx + (ev.xmotion.x - x);
1231                         ny = ocy + (ev.xmotion.y - y);
1232                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1233                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1234                                 if(abs(selmon->wx - nx) < snap)
1235                                         nx = selmon->wx;
1236                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1237                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1238                                 if(abs(selmon->wy - ny) < snap)
1239                                         ny = selmon->wy;
1240                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1241                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1242                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1243                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1244                                         togglefloating(NULL);
1245                         }
1246                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1247                                 resize(c, nx, ny, c->w, c->h, True);
1248                         break;
1249                 }
1250         } while(ev.type != ButtonRelease);
1251         XUngrabPointer(dpy, CurrentTime);
1252         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1253                 sendmon(c, m);
1254                 selmon = m;
1255                 focus(NULL);
1256         }
1257 }
1258
1259 Client *
1260 nexttiled(Client *c) {
1261         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1262         return c;
1263 }
1264
1265 void
1266 pop(Client *c) {
1267         detach(c);
1268         attach(c);
1269         focus(c);
1270         arrange(c->mon);
1271 }
1272
1273 void
1274 propertynotify(XEvent *e) {
1275         Client *c;
1276         Window trans;
1277         XPropertyEvent *ev = &e->xproperty;
1278
1279         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1280                 updatestatus();
1281         else if(ev->state == PropertyDelete)
1282                 return; /* ignore */
1283         else if((c = wintoclient(ev->window))) {
1284                 switch(ev->atom) {
1285                 default: break;
1286                 case XA_WM_TRANSIENT_FOR:
1287                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1288                            (c->isfloating = (wintoclient(trans)) != NULL))
1289                                 arrange(c->mon);
1290                         break;
1291                 case XA_WM_NORMAL_HINTS:
1292                         updatesizehints(c);
1293                         break;
1294                 case XA_WM_HINTS:
1295                         updatewmhints(c);
1296                         drawbars();
1297                         break;
1298                 }
1299                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1300                         updatetitle(c);
1301                         if(c == c->mon->sel)
1302                                 drawbar(c->mon);
1303                 }
1304                 if(ev->atom == netatom[NetWMWindowType])
1305                         updatewindowtype(c);
1306         }
1307 }
1308
1309 void
1310 quit(const Arg *arg) {
1311         running = False;
1312 }
1313
1314 Monitor *
1315 recttomon(int x, int y, int w, int h) {
1316         Monitor *m, *r = selmon;
1317         int a, area = 0;
1318
1319         for(m = mons; m; m = m->next)
1320                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1321                         area = a;
1322                         r = m;
1323                 }
1324         return r;
1325 }
1326
1327 void
1328 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1329         if(applysizehints(c, &x, &y, &w, &h, interact))
1330                 resizeclient(c, x, y, w, h);
1331 }
1332
1333 void
1334 resizeclient(Client *c, int x, int y, int w, int h) {
1335         XWindowChanges wc;
1336
1337         c->oldx = c->x; c->x = wc.x = x;
1338         c->oldy = c->y; c->y = wc.y = y;
1339         c->oldw = c->w; c->w = wc.width = w;
1340         c->oldh = c->h; c->h = wc.height = h;
1341         wc.border_width = c->bw;
1342         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1343         configure(c);
1344         XSync(dpy, False);
1345 }
1346
1347 void
1348 resizemouse(const Arg *arg) {
1349         int ocx, ocy;
1350         int nw, nh;
1351         Client *c;
1352         Monitor *m;
1353         XEvent ev;
1354
1355         if(!(c = selmon->sel))
1356                 return;
1357         restack(selmon);
1358         ocx = c->x;
1359         ocy = c->y;
1360         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1361                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1362                 return;
1363         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1364         do {
1365                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1366                 switch(ev.type) {
1367                 case ConfigureRequest:
1368                 case Expose:
1369                 case MapRequest:
1370                         handler[ev.type](&ev);
1371                         break;
1372                 case MotionNotify:
1373                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1374                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1375                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1376                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1377                         {
1378                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1379                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1380                                         togglefloating(NULL);
1381                         }
1382                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1383                                 resize(c, c->x, c->y, nw, nh, True);
1384                         break;
1385                 }
1386         } while(ev.type != ButtonRelease);
1387         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1388         XUngrabPointer(dpy, CurrentTime);
1389         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1390         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1391                 sendmon(c, m);
1392                 selmon = m;
1393                 focus(NULL);
1394         }
1395 }
1396
1397 void
1398 restack(Monitor *m) {
1399         Client *c;
1400         XEvent ev;
1401         XWindowChanges wc;
1402
1403         drawbar(m);
1404         if(!m->sel)
1405                 return;
1406         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1407                 XRaiseWindow(dpy, m->sel->win);
1408         if(m->lt[m->sellt]->arrange) {
1409                 wc.stack_mode = Below;
1410                 wc.sibling = m->barwin;
1411                 for(c = m->stack; c; c = c->snext)
1412                         if(!c->isfloating && ISVISIBLE(c)) {
1413                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1414                                 wc.sibling = c->win;
1415                         }
1416         }
1417         XSync(dpy, False);
1418         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1419 }
1420
1421 void
1422 run(void) {
1423         XEvent ev;
1424         /* main event loop */
1425         XSync(dpy, False);
1426         while(running && !XNextEvent(dpy, &ev))
1427                 if(handler[ev.type])
1428                         handler[ev.type](&ev); /* call handler */
1429 }
1430
1431 void
1432 scan(void) {
1433         unsigned int i, num;
1434         Window d1, d2, *wins = NULL;
1435         XWindowAttributes wa;
1436
1437         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1438                 for(i = 0; i < num; i++) {
1439                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1440                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1441                                 continue;
1442                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1443                                 manage(wins[i], &wa);
1444                 }
1445                 for(i = 0; i < num; i++) { /* now the transients */
1446                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1447                                 continue;
1448                         if(XGetTransientForHint(dpy, wins[i], &d1)
1449                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1450                                 manage(wins[i], &wa);
1451                 }
1452                 if(wins)
1453                         XFree(wins);
1454         }
1455 }
1456
1457 void
1458 sendmon(Client *c, Monitor *m) {
1459         if(c->mon == m)
1460                 return;
1461         unfocus(c, True);
1462         detach(c);
1463         detachstack(c);
1464         c->mon = m;
1465         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1466         attach(c);
1467         attachstack(c);
1468         focus(NULL);
1469         arrange(NULL);
1470 }
1471
1472 void
1473 setclientstate(Client *c, long state) {
1474         long data[] = { state, None };
1475
1476         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1477                         PropModeReplace, (unsigned char *)data, 2);
1478 }
1479
1480 Bool
1481 sendevent(Client *c, Atom proto) {
1482         int n;
1483         Atom *protocols;
1484         Bool exists = False;
1485         XEvent ev;
1486
1487         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1488                 while(!exists && n--)
1489                         exists = protocols[n] == proto;
1490                 XFree(protocols);
1491         }
1492         if(exists) {
1493                 ev.type = ClientMessage;
1494                 ev.xclient.window = c->win;
1495                 ev.xclient.message_type = wmatom[WMProtocols];
1496                 ev.xclient.format = 32;
1497                 ev.xclient.data.l[0] = proto;
1498                 ev.xclient.data.l[1] = CurrentTime;
1499                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1500         }
1501         return exists;
1502 }
1503
1504 void
1505 setfocus(Client *c) {
1506         if(!c->neverfocus)
1507                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1508         sendevent(c, wmatom[WMTakeFocus]);
1509 }
1510
1511 void
1512 setfullscreen(Client *c, Bool fullscreen) {
1513         if(fullscreen) {
1514                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1515                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1516                 c->isfullscreen = True;
1517                 c->oldstate = c->isfloating;
1518                 c->oldbw = c->bw;
1519                 c->bw = 0;
1520                 c->isfloating = True;
1521                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1522                 XRaiseWindow(dpy, c->win);
1523         }
1524         else {
1525                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1526                                 PropModeReplace, (unsigned char*)0, 0);
1527                 c->isfullscreen = False;
1528                 c->isfloating = c->oldstate;
1529                 c->bw = c->oldbw;
1530                 c->x = c->oldx;
1531                 c->y = c->oldy;
1532                 c->w = c->oldw;
1533                 c->h = c->oldh;
1534                 resizeclient(c, c->x, c->y, c->w, c->h);
1535                 arrange(c->mon);
1536         }
1537 }
1538
1539 void
1540 setlayout(const Arg *arg) {
1541         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1542                 selmon->sellt ^= 1;
1543         if(arg && arg->v)
1544                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1545         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1546         if(selmon->sel)
1547                 arrange(selmon);
1548         else
1549                 drawbar(selmon);
1550 }
1551
1552 /* arg > 1.0 will set mfact absolutly */
1553 void
1554 setmfact(const Arg *arg) {
1555         float f;
1556
1557         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1558                 return;
1559         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1560         if(f < 0.1 || f > 0.9)
1561                 return;
1562         selmon->mfact = f;
1563         arrange(selmon);
1564 }
1565
1566 void
1567 setup(void) {
1568         XSetWindowAttributes wa;
1569
1570         /* clean up any zombies immediately */
1571         sigchld(0);
1572
1573         /* init screen */
1574         screen = DefaultScreen(dpy);
1575         root = RootWindow(dpy, screen);
1576         initfont(font);
1577         sw = DisplayWidth(dpy, screen);
1578         sh = DisplayHeight(dpy, screen);
1579         bh = dc.h = dc.font.height + 2;
1580         updategeom();
1581         /* init atoms */
1582         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1583         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1584         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1585         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1586         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1587         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1588         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1589         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1590         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1591         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1592         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1593         /* init cursors */
1594         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1595         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1596         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1597         /* init appearance */
1598         dc.norm[ColBorder] = getcolor(normbordercolor);
1599         dc.norm[ColBG] = getcolor(normbgcolor);
1600         dc.norm[ColFG] = getcolor(normfgcolor);
1601         dc.sel[ColBorder] = getcolor(selbordercolor);
1602         dc.sel[ColBG] = getcolor(selbgcolor);
1603         dc.sel[ColFG] = getcolor(selfgcolor);
1604         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1605         dc.gc = XCreateGC(dpy, root, 0, NULL);
1606         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1607         if(!dc.font.set)
1608                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1609         /* init bars */
1610         updatebars();
1611         updatestatus();
1612         /* EWMH support per view */
1613         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1614                         PropModeReplace, (unsigned char *) netatom, NetLast);
1615         /* select for events */
1616         wa.cursor = cursor[CurNormal];
1617         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1618                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1619                         |PropertyChangeMask;
1620         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1621         XSelectInput(dpy, root, wa.event_mask);
1622         grabkeys();
1623 }
1624
1625 void
1626 showhide(Client *c) {
1627         if(!c)
1628                 return;
1629         if(ISVISIBLE(c)) { /* show clients top down */
1630                 XMoveWindow(dpy, c->win, c->x, c->y);
1631                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1632                         resize(c, c->x, c->y, c->w, c->h, False);
1633                 showhide(c->snext);
1634         }
1635         else { /* hide clients bottom up */
1636                 showhide(c->snext);
1637                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1638         }
1639 }
1640
1641 void
1642 sigchld(int unused) {
1643         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1644                 die("Can't install SIGCHLD handler");
1645         while(0 < waitpid(-1, NULL, WNOHANG));
1646 }
1647
1648 void
1649 spawn(const Arg *arg) {
1650         if(fork() == 0) {
1651                 if(dpy)
1652                         close(ConnectionNumber(dpy));
1653                 setsid();
1654                 execvp(((char **)arg->v)[0], (char **)arg->v);
1655                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1656                 perror(" failed");
1657                 exit(EXIT_SUCCESS);
1658         }
1659 }
1660
1661 void
1662 tag(const Arg *arg) {
1663         if(selmon->sel && arg->ui & TAGMASK) {
1664                 selmon->sel->tags = arg->ui & TAGMASK;
1665                 focus(NULL);
1666                 arrange(selmon);
1667         }
1668 }
1669
1670 void
1671 tagmon(const Arg *arg) {
1672         if(!selmon->sel || !mons->next)
1673                 return;
1674         sendmon(selmon->sel, dirtomon(arg->i));
1675 }
1676
1677 int
1678 textnw(const char *text, unsigned int len) {
1679         XRectangle r;
1680
1681         if(dc.font.set) {
1682                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1683                 return r.width;
1684         }
1685         return XTextWidth(dc.font.xfont, text, len);
1686 }
1687
1688 void
1689 tile(Monitor *m) {
1690         unsigned int i, n, h, mw, my, ty;
1691         Client *c;
1692
1693         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1694         if(n == 0)
1695                 return;
1696
1697         if(n > m->nmaster)
1698                 mw = m->nmaster ? m->ww * m->mfact : 0;
1699         else
1700                 mw = m->ww;
1701         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1702                 if(i < m->nmaster) {
1703                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1704                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1705                         my += HEIGHT(c);
1706                 }
1707                 else {
1708                         h = (m->wh - ty) / (n - i);
1709                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1710                         ty += HEIGHT(c);
1711                 }
1712 }
1713
1714 void
1715 togglebar(const Arg *arg) {
1716         selmon->showbar = !selmon->showbar;
1717         updatebarpos(selmon);
1718         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1719         arrange(selmon);
1720 }
1721
1722 void
1723 togglefloating(const Arg *arg) {
1724         if(!selmon->sel)
1725                 return;
1726         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1727         if(selmon->sel->isfloating)
1728                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1729                        selmon->sel->w, selmon->sel->h, False);
1730         arrange(selmon);
1731 }
1732
1733 void
1734 toggletag(const Arg *arg) {
1735         unsigned int newtags;
1736
1737         if(!selmon->sel)
1738                 return;
1739         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1740         if(newtags) {
1741                 selmon->sel->tags = newtags;
1742                 focus(NULL);
1743                 arrange(selmon);
1744         }
1745 }
1746
1747 void
1748 toggleview(const Arg *arg) {
1749         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1750
1751         if(newtagset) {
1752                 selmon->tagset[selmon->seltags] = newtagset;
1753                 focus(NULL);
1754                 arrange(selmon);
1755         }
1756 }
1757
1758 void
1759 unfocus(Client *c, Bool setfocus) {
1760         if(!c)
1761                 return;
1762         grabbuttons(c, False);
1763         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1764         if(setfocus)
1765                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1766 }
1767
1768 void
1769 unmanage(Client *c, Bool destroyed) {
1770         Monitor *m = c->mon;
1771         XWindowChanges wc;
1772
1773         /* The server grab construct avoids race conditions. */
1774         detach(c);
1775         detachstack(c);
1776         if(!destroyed) {
1777                 wc.border_width = c->oldbw;
1778                 XGrabServer(dpy);
1779                 XSetErrorHandler(xerrordummy);
1780                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1781                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1782                 setclientstate(c, WithdrawnState);
1783                 XSync(dpy, False);
1784                 XSetErrorHandler(xerror);
1785                 XUngrabServer(dpy);
1786         }
1787         free(c);
1788         focus(NULL);
1789         arrange(m);
1790 }
1791
1792 void
1793 unmapnotify(XEvent *e) {
1794         Client *c;
1795         XUnmapEvent *ev = &e->xunmap;
1796
1797         if((c = wintoclient(ev->window))) {
1798                 if(ev->send_event)
1799                         setclientstate(c, WithdrawnState);
1800                 else
1801                         unmanage(c, False);
1802         }
1803 }
1804
1805 void
1806 updatebars(void) {
1807         Monitor *m;
1808         XSetWindowAttributes wa = {
1809                 .override_redirect = True,
1810                 .background_pixmap = ParentRelative,
1811                 .event_mask = ButtonPressMask|ExposureMask
1812         };
1813         for(m = mons; m; m = m->next) {
1814                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1815                                           CopyFromParent, DefaultVisual(dpy, screen),
1816                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1817                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1818                 XMapRaised(dpy, m->barwin);
1819         }
1820 }
1821
1822 void
1823 updatebarpos(Monitor *m) {
1824         m->wy = m->my;
1825         m->wh = m->mh;
1826         if(m->showbar) {
1827                 m->wh -= bh;
1828                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1829                 m->wy = m->topbar ? m->wy + bh : m->wy;
1830         }
1831         else
1832                 m->by = -bh;
1833 }
1834
1835 Bool
1836 updategeom(void) {
1837         Bool dirty = False;
1838
1839 #ifdef XINERAMA
1840         if(XineramaIsActive(dpy)) {
1841                 int i, j, n, nn;
1842                 Client *c;
1843                 Monitor *m;
1844                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1845                 XineramaScreenInfo *unique = NULL;
1846
1847                 for(n = 0, m = mons; m; m = m->next, n++);
1848                 /* only consider unique geometries as separate screens */
1849                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1850                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1851                 for(i = 0, j = 0; i < nn; i++)
1852                         if(isuniquegeom(unique, j, &info[i]))
1853                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1854                 XFree(info);
1855                 nn = j;
1856                 if(n <= nn) {
1857                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1858                                 for(m = mons; m && m->next; m = m->next);
1859                                 if(m)
1860                                         m->next = createmon();
1861                                 else
1862                                         mons = createmon();
1863                         }
1864                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1865                                 if(i >= n
1866                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1867                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1868                                 {
1869                                         dirty = True;
1870                                         m->num = i;
1871                                         m->mx = m->wx = unique[i].x_org;
1872                                         m->my = m->wy = unique[i].y_org;
1873                                         m->mw = m->ww = unique[i].width;
1874                                         m->mh = m->wh = unique[i].height;
1875                                         updatebarpos(m);
1876                                 }
1877                 }
1878                 else { /* less monitors available nn < n */
1879                         for(i = nn; i < n; i++) {
1880                                 for(m = mons; m && m->next; m = m->next);
1881                                 while(m->clients) {
1882                                         dirty = True;
1883                                         c = m->clients;
1884                                         m->clients = c->next;
1885                                         detachstack(c);
1886                                         c->mon = mons;
1887                                         attach(c);
1888                                         attachstack(c);
1889                                 }
1890                                 if(m == selmon)
1891                                         selmon = mons;
1892                                 cleanupmon(m);
1893                         }
1894                 }
1895                 free(unique);
1896         }
1897         else
1898 #endif /* XINERAMA */
1899         /* default monitor setup */
1900         {
1901                 if(!mons)
1902                         mons = createmon();
1903                 if(mons->mw != sw || mons->mh != sh) {
1904                         dirty = True;
1905                         mons->mw = mons->ww = sw;
1906                         mons->mh = mons->wh = sh;
1907                         updatebarpos(mons);
1908                 }
1909         }
1910         if(dirty) {
1911                 selmon = mons;
1912                 selmon = wintomon(root);
1913         }
1914         return dirty;
1915 }
1916
1917 void
1918 updatenumlockmask(void) {
1919         unsigned int i, j;
1920         XModifierKeymap *modmap;
1921
1922         numlockmask = 0;
1923         modmap = XGetModifierMapping(dpy);
1924         for(i = 0; i < 8; i++)
1925                 for(j = 0; j < modmap->max_keypermod; j++)
1926                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1927                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1928                                 numlockmask = (1 << i);
1929         XFreeModifiermap(modmap);
1930 }
1931
1932 void
1933 updatesizehints(Client *c) {
1934         long msize;
1935         XSizeHints size;
1936
1937         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1938                 /* size is uninitialized, ensure that size.flags aren't used */
1939                 size.flags = PSize;
1940         if(size.flags & PBaseSize) {
1941                 c->basew = size.base_width;
1942                 c->baseh = size.base_height;
1943         }
1944         else if(size.flags & PMinSize) {
1945                 c->basew = size.min_width;
1946                 c->baseh = size.min_height;
1947         }
1948         else
1949                 c->basew = c->baseh = 0;
1950         if(size.flags & PResizeInc) {
1951                 c->incw = size.width_inc;
1952                 c->inch = size.height_inc;
1953         }
1954         else
1955                 c->incw = c->inch = 0;
1956         if(size.flags & PMaxSize) {
1957                 c->maxw = size.max_width;
1958                 c->maxh = size.max_height;
1959         }
1960         else
1961                 c->maxw = c->maxh = 0;
1962         if(size.flags & PMinSize) {
1963                 c->minw = size.min_width;
1964                 c->minh = size.min_height;
1965         }
1966         else if(size.flags & PBaseSize) {
1967                 c->minw = size.base_width;
1968                 c->minh = size.base_height;
1969         }
1970         else
1971                 c->minw = c->minh = 0;
1972         if(size.flags & PAspect) {
1973                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1974                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1975         }
1976         else
1977                 c->maxa = c->mina = 0.0;
1978         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1979                      && c->maxw == c->minw && c->maxh == c->minh);
1980 }
1981
1982 void
1983 updatetitle(Client *c) {
1984         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1985                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1986         if(c->name[0] == '\0') /* hack to mark broken clients */
1987                 strcpy(c->name, broken);
1988 }
1989
1990 void
1991 updatestatus(void) {
1992         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1993                 strcpy(stext, "dwm-"VERSION);
1994         drawbar(selmon);
1995 }
1996
1997 void
1998 updatewindowtype(Client *c) {
1999         Atom state = getatomprop(c, netatom[NetWMState]);
2000         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2001
2002         if(state == netatom[NetWMFullscreen])
2003                 setfullscreen(c, True);
2004
2005         if(wtype == netatom[NetWMWindowTypeDialog])
2006                 c->isfloating = True;
2007 }
2008
2009 void
2010 updatewmhints(Client *c) {
2011         XWMHints *wmh;
2012
2013         if((wmh = XGetWMHints(dpy, c->win))) {
2014                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2015                         wmh->flags &= ~XUrgencyHint;
2016                         XSetWMHints(dpy, c->win, wmh);
2017                 }
2018                 else
2019                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2020                 if(wmh->flags & InputHint)
2021                         c->neverfocus = !wmh->input;
2022                 else
2023                         c->neverfocus = False;
2024                 XFree(wmh);
2025         }
2026 }
2027
2028 void
2029 view(const Arg *arg) {
2030         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2031                 return;
2032         selmon->seltags ^= 1; /* toggle sel tagset */
2033         if(arg->ui & TAGMASK)
2034                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2035         focus(NULL);
2036         arrange(selmon);
2037 }
2038
2039 Client *
2040 wintoclient(Window w) {
2041         Client *c;
2042         Monitor *m;
2043
2044         for(m = mons; m; m = m->next)
2045                 for(c = m->clients; c; c = c->next)
2046                         if(c->win == w)
2047                                 return c;
2048         return NULL;
2049 }
2050
2051 Monitor *
2052 wintomon(Window w) {
2053         int x, y;
2054         Client *c;
2055         Monitor *m;
2056
2057         if(w == root && getrootptr(&x, &y))
2058                 return recttomon(x, y, 1, 1);
2059         for(m = mons; m; m = m->next)
2060                 if(w == m->barwin)
2061                         return m;
2062         if((c = wintoclient(w)))
2063                 return c->mon;
2064         return selmon;
2065 }
2066
2067 /* There's no way to check accesses to destroyed windows, thus those cases are
2068  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2069  * default error handler, which may call exit.  */
2070 int
2071 xerror(Display *dpy, XErrorEvent *ee) {
2072         if(ee->error_code == BadWindow
2073         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2074         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2075         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2076         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2077         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2078         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2079         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2080         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2081                 return 0;
2082         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2083                         ee->request_code, ee->error_code);
2084         return xerrorxlib(dpy, ee); /* may call exit */
2085 }
2086
2087 int
2088 xerrordummy(Display *dpy, XErrorEvent *ee) {
2089         return 0;
2090 }
2091
2092 /* Startup Error handler to check if another window manager
2093  * is already running. */
2094 int
2095 xerrorstart(Display *dpy, XErrorEvent *ee) {
2096         die("dwm: another window manager is already running\n");
2097         return -1;
2098 }
2099
2100 void
2101 zoom(const Arg *arg) {
2102         Client *c = selmon->sel;
2103
2104         if(!selmon->lt[selmon->sellt]->arrange
2105         || (selmon->sel && selmon->sel->isfloating))
2106                 return;
2107         if(c == nexttiled(selmon->clients))
2108                 if(!c || !(c = nexttiled(c->next)))
2109                         return;
2110         pop(c);
2111 }
2112
2113 int
2114 main(int argc, char *argv[]) {
2115         if(argc == 2 && !strcmp("-v", argv[1]))
2116                 die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2117         else if(argc != 1)
2118                 die("usage: dwm [-v]\n");
2119         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2120                 fputs("warning: no locale support\n", stderr);
2121         if(!(dpy = XOpenDisplay(NULL)))
2122                 die("dwm: cannot open display\n");
2123         checkotherwm();
2124         setup();
2125         scan();
2126         run();
2127         cleanup();
2128         XCloseDisplay(dpy);
2129         return EXIT_SUCCESS;
2130 }