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 #include <X11/XKBlib.h>
  40 #include <fontconfig/fontconfig.h>
  41 #include <X11/Xft/Xft.h>
  42 #ifdef XINERAMA
  43 #include <X11/extensions/Xinerama.h>
  44 #endif /* XINERAMA */
  45
  46 #include "draw.h"
  47
  48 /* macros */
  49 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  50 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  51 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  52                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  53 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  54 #define LENGTH(X)               (sizeof X / sizeof X[0])
  55 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  56 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  57 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  58 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  59 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  60 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  61 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  62
  63 /* enums */
  64 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  65 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  66 enum { NetSupported, NetWMName, NetWMState,
  67        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  68        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  69 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  70 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  71        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  72
  73 typedef union {
  74         int i;
  75         unsigned int ui;
  76         float f;
  77         const void *v;
  78 } Arg;
  79
  80 typedef struct {
  81         unsigned int click;
  82         unsigned int mask;
  83         unsigned int button;
  84         void (*func)(const Arg *arg);
  85         const Arg arg;
  86 } Button;
  87
  88 typedef struct Monitor Monitor;
  89 typedef struct Client Client;
  90 struct Client {
  91         char name[256];
  92         float mina, maxa;
  93         int x, y, w, h;
  94         int oldx, oldy, oldw, oldh;
  95         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  96         int bw, oldbw;
  97         unsigned int tags;
  98         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  99         Client *next;
 100         Client *snext;
 101         Monitor *mon;
 102         Window win;
 103 };
 104
 105 typedef struct {
 106         int x, y, w, h;
 107         XftColor norm[ColLast];
 108         XftColor sel[ColLast];
 109         Drawable drawable;
 110         GC gc;
 111         struct {
 112                 int ascent;
 113                 int descent;
 114                 int height;
 115                 XftFont *xfont;
 116         } font;
 117 } DC; /* draw context */
 118
 119 typedef struct {
 120         unsigned int mod;
 121         KeySym keysym;
 122         void (*func)(const Arg *);
 123         const Arg arg;
 124 } Key;
 125
 126 typedef struct {
 127         const char *symbol;
 128         void (*arrange)(Monitor *);
 129 } Layout;
 130
 131 struct Monitor {
 132         char ltsymbol[16];
 133         float mfact;
 134         int nmaster;
 135         int num;
 136         int by;               /* bar geometry */
 137         int mx, my, mw, mh;   /* screen size */
 138         int wx, wy, ww, wh;   /* window area  */
 139         unsigned int seltags;
 140         unsigned int sellt;
 141         unsigned int tagset[2];
 142         Bool showbar;
 143         Bool topbar;
 144         Client *clients;
 145         Client *sel;
 146         Client *stack;
 147         Monitor *next;
 148         Window barwin;
 149         const Layout *lt[2];
 150 };
 151
 152 typedef struct {
 153         const char *class;
 154         const char *instance;
 155         const char *title;
 156         unsigned int tags;
 157         Bool isfloating;
 158         int monitor;
 159 } Rule;
 160
 161 /* function declarations */
 162 static void applyrules(Client *c);
 163 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 164 static void arrange(Monitor *m);
 165 static void arrangemon(Monitor *m);
 166 static void attach(Client *c);
 167 static void attachstack(Client *c);
 168 static void buttonpress(XEvent *e);
 169 static void checkotherwm(void);
 170 static void cleanup(void);
 171 static void cleanupmon(Monitor *mon);
 172 static void clearurgent(Client *c);
 173 static void clientmessage(XEvent *e);
 174 static void configure(Client *c);
 175 static void configurenotify(XEvent *e);
 176 static void configurerequest(XEvent *e);
 177 static Monitor *createmon(void);
 178 static void destroynotify(XEvent *e);
 179 static void detach(Client *c);
 180 static void detachstack(Client *c);
 181 static void die(const char *errstr, ...);
 182 static Monitor *dirtomon(int dir);
 183 static void drawbar(Monitor *m);
 184 static void drawbars(void);
 185 static void drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]);
 186 static void drawtext(const char *text, XftColor col[ColLast], Bool invert);
 187 static void enternotify(XEvent *e);
 188 static void expose(XEvent *e);
 189 static void focus(Client *c);
 190 static void focusin(XEvent *e);
 191 static void focusmon(const Arg *arg);
 192 static void focusstack(const Arg *arg);
 193 static XftColor getcolor(const char *colstr);
 194 static Bool getrootptr(int *x, int *y);
 195 static long getstate(Window w);
 196 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 197 static void grabbuttons(Client *c, Bool focused);
 198 static void grabkeys(void);
 199 static void incnmaster(const Arg *arg);
 200 static void initfont(const char *fontstr);
 201 static void keypress(XEvent *e);
 202 static void killclient(const Arg *arg);
 203 static void manage(Window w, XWindowAttributes *wa);
 204 static void mappingnotify(XEvent *e);
 205 static void maprequest(XEvent *e);
 206 static void monocle(Monitor *m);
 207 static void motionnotify(XEvent *e);
 208 static void movemouse(const Arg *arg);
 209 static Client *nexttiled(Client *c);
 210 static void pop(Client *);
 211 static void propertynotify(XEvent *e);
 212 static void quit(const Arg *arg);
 213 static Monitor *recttomon(int x, int y, int w, int h);
 214 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 215 static void resizeclient(Client *c, int x, int y, int w, int h);
 216 static void resizemouse(const Arg *arg);
 217 static void restack(Monitor *m);
 218 static void run(void);
 219 static void scan(void);
 220 static Bool sendevent(Client *c, Atom proto);
 221 static void sendmon(Client *c, Monitor *m);
 222 static void setclientstate(Client *c, long state);
 223 static void setfocus(Client *c);
 224 static void setfullscreen(Client *c, Bool fullscreen);
 225 static void setlayout(const Arg *arg);
 226 static void setmfact(const Arg *arg);
 227 static void setup(void);
 228 static void showhide(Client *c);
 229 static void sigchld(int unused);
 230 static void spawn(const Arg *arg);
 231 static void tag(const Arg *arg);
 232 static void tagmon(const Arg *arg);
 233 static int textnw(const char *text, unsigned int len);
 234 static void tile(Monitor *);
 235 static void togglebar(const Arg *arg);
 236 static void togglefloating(const Arg *arg);
 237 static void toggletag(const Arg *arg);
 238 static void toggleview(const Arg *arg);
 239 static void unfocus(Client *c, Bool setfocus);
 240 static void unmanage(Client *c, Bool destroyed);
 241 static void unmapnotify(XEvent *e);
 242 static Bool updategeom(void);
 243 static void updatebarpos(Monitor *m);
 244 static void updatebars(void);
 245 static void updateclientlist(void);
 246 static void updatenumlockmask(void);
 247 static void updatesizehints(Client *c);
 248 static void updatestatus(void);
 249 static void updatewindowtype(Client *c);
 250 static void updatetitle(Client *c);
 251 static void updatewmhints(Client *c);
 252 static void view(const Arg *arg);
 253 static Client *wintoclient(Window w);
 254 static Monitor *wintomon(Window w);
 255 static int xerror(Display *dpy, XErrorEvent *ee);
 256 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 257 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 258 static void zoom(const Arg *arg);
 259
 260 /* variables */
 261 static const char broken[] = "broken";
 262 static char stext[256];
 263 static int screen;
 264 static int sw, sh;           /* X display screen geometry width, height */
 265 static int bh, blw = 0;      /* bar geometry */
 266 static int (*xerrorxlib)(Display *, XErrorEvent *);
 267 static unsigned int numlockmask = 0;
 268 static void (*handler[LASTEvent]) (XEvent *) = {
 269         [ButtonPress] = buttonpress,
 270         [ClientMessage] = clientmessage,
 271         [ConfigureRequest] = configurerequest,
 272         [ConfigureNotify] = configurenotify,
 273         [DestroyNotify] = destroynotify,
 274         [EnterNotify] = enternotify,
 275         [Expose] = expose,
 276         [FocusIn] = focusin,
 277         [KeyPress] = keypress,
 278         [MappingNotify] = mappingnotify,
 279         [MapRequest] = maprequest,
 280         [MotionNotify] = motionnotify,
 281         [PropertyNotify] = propertynotify,
 282         [UnmapNotify] = unmapnotify
 283 };
 284 static Atom wmatom[WMLast], netatom[NetLast];
 285 static Bool running = True;
 286 static Cursor cursor[CurLast];
 287 static Display *dpy;
 288 static DC dc;
 289 static Monitor *mons = NULL, *selmon = NULL;
 290 static Window root;
 291
 292 /* configuration, allows nested code to access above variables */
 293 #include "config.h"
 294
 295 /* compile-time check if all tags fit into an unsigned int bit array. */
 296 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 297
 298 /* function implementations */
 299 void
 300 applyrules(Client *c) {
 301         const char *class, *instance;
 302         unsigned int i;
 303         const Rule *r;
 304         Monitor *m;
 305         XClassHint ch = { NULL, NULL };
 306
 307         /* rule matching */
 308         c->isfloating = c->tags = 0;
 309         XGetClassHint(dpy, c->win, &ch);
 310         class    = ch.res_class ? ch.res_class : broken;
 311         instance = ch.res_name  ? ch.res_name  : broken;
 312
 313         for(i = 0; i < LENGTH(rules); i++) {
 314                 r = &rules[i];
 315                 if((!r->title || strstr(c->name, r->title))
 316                 && (!r->class || strstr(class, r->class))
 317                 && (!r->instance || strstr(instance, r->instance)))
 318                 {
 319                         c->isfloating = r->isfloating;
 320                         c->tags |= r->tags;
 321                         for(m = mons; m && m->num != r->monitor; m = m->next);
 322                         if(m)
 323                                 c->mon = m;
 324                 }
 325         }
 326         if(ch.res_class)
 327                 XFree(ch.res_class);
 328         if(ch.res_name)
 329                 XFree(ch.res_name);
 330         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 331 }
 332
 333 Bool
 334 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 335         Bool baseismin;
 336         Monitor *m = c->mon;
 337
 338         /* set minimum possible */
 339         *w = MAX(1, *w);
 340         *h = MAX(1, *h);
 341         if(interact) {
 342                 if(*x > sw)
 343                         *x = sw - WIDTH(c);
 344                 if(*y > sh)
 345                         *y = sh - HEIGHT(c);
 346                 if(*x + *w + 2 * c->bw < 0)
 347                         *x = 0;
 348                 if(*y + *h + 2 * c->bw < 0)
 349                         *y = 0;
 350         }
 351         else {
 352                 if(*x >= m->wx + m->ww)
 353                         *x = m->wx + m->ww - WIDTH(c);
 354                 if(*y >= m->wy + m->wh)
 355                         *y = m->wy + m->wh - HEIGHT(c);
 356                 if(*x + *w + 2 * c->bw <= m->wx)
 357                         *x = m->wx;
 358                 if(*y + *h + 2 * c->bw <= m->wy)
 359                         *y = m->wy;
 360         }
 361         if(*h < bh)
 362                 *h = bh;
 363         if(*w < bh)
 364                 *w = bh;
 365         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 366                 /* see last two sentences in ICCCM 4.1.2.3 */
 367                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 368                 if(!baseismin) { /* temporarily remove base dimensions */
 369                         *w -= c->basew;
 370                         *h -= c->baseh;
 371                 }
 372                 /* adjust for aspect limits */
 373                 if(c->mina > 0 && c->maxa > 0) {
 374                         if(c->maxa < (float)*w / *h)
 375                                 *w = *h * c->maxa + 0.5;
 376                         else if(c->mina < (float)*h / *w)
 377                                 *h = *w * c->mina + 0.5;
 378                 }
 379                 if(baseismin) { /* increment calculation requires this */
 380                         *w -= c->basew;
 381                         *h -= c->baseh;
 382                 }
 383                 /* adjust for increment value */
 384                 if(c->incw)
 385                         *w -= *w % c->incw;
 386                 if(c->inch)
 387                         *h -= *h % c->inch;
 388                 /* restore base dimensions */
 389                 *w = MAX(*w + c->basew, c->minw);
 390                 *h = MAX(*h + c->baseh, c->minh);
 391                 if(c->maxw)
 392                         *w = MIN(*w, c->maxw);
 393                 if(c->maxh)
 394                         *h = MIN(*h, c->maxh);
 395         }
 396         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 397 }
 398
 399 void
 400 arrange(Monitor *m) {
 401         if(m)
 402                 showhide(m->stack);
 403         else for(m = mons; m; m = m->next)
 404                 showhide(m->stack);
 405         if(m) {
 406                 arrangemon(m);
 407                 restack(m);
 408         } else for(m = mons; m; m = m->next)
 409                 arrangemon(m);
 410 }
 411
 412 void
 413 arrangemon(Monitor *m) {
 414         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 415         if(m->lt[m->sellt]->arrange)
 416                 m->lt[m->sellt]->arrange(m);
 417 }
 418
 419 void
 420 attach(Client *c) {
 421         c->next = c->mon->clients;
 422         c->mon->clients = c;
 423 }
 424
 425 void
 426 attachstack(Client *c) {
 427         c->snext = c->mon->stack;
 428         c->mon->stack = c;
 429 }
 430
 431 void
 432 buttonpress(XEvent *e) {
 433         unsigned int i, x, click;
 434         Arg arg = {0};
 435         Client *c;
 436         Monitor *m;
 437         XButtonPressedEvent *ev = &e->xbutton;
 438
 439         click = ClkRootWin;
 440         /* focus monitor if necessary */
 441         if((m = wintomon(ev->window)) && m != selmon) {
 442                 unfocus(selmon->sel, True);
 443                 selmon = m;
 444                 focus(NULL);
 445         }
 446         if(ev->window == selmon->barwin) {
 447                 i = x = 0;
 448                 do
 449                         x += TEXTW(tags[i]);
 450                 while(ev->x >= x && ++i < LENGTH(tags));
 451                 if(i < LENGTH(tags)) {
 452                         click = ClkTagBar;
 453                         arg.ui = 1 << i;
 454                 }
 455                 else if(ev->x < x + blw)
 456                         click = ClkLtSymbol;
 457                 else if(ev->x > selmon->ww - TEXTW(stext))
 458                         click = ClkStatusText;
 459                 else
 460                         click = ClkWinTitle;
 461         }
 462         else if((c = wintoclient(ev->window))) {
 463                 focus(c);
 464                 click = ClkClientWin;
 465         }
 466         for(i = 0; i < LENGTH(buttons); i++)
 467                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 468                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 469                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 470 }
 471
 472 void
 473 checkotherwm(void) {
 474         xerrorxlib = XSetErrorHandler(xerrorstart);
 475         /* this causes an error if some other window manager is running */
 476         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 477         XSync(dpy, False);
 478         XSetErrorHandler(xerror);
 479         XSync(dpy, False);
 480 }
 481
 482 void
 483 cleanup(void) {
 484         Arg a = {.ui = ~0};
 485         Layout foo = { "", NULL };
 486         Monitor *m;
 487
 488         view(&a);
 489         selmon->lt[selmon->sellt] = &foo;
 490         for(m = mons; m; m = m->next)
 491                 while(m->stack)
 492                         unmanage(m->stack, False);
 493         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 494         XFreePixmap(dpy, dc.drawable);
 495         XFreeGC(dpy, dc.gc);
 496         XFreeCursor(dpy, cursor[CurNormal]);
 497         XFreeCursor(dpy, cursor[CurResize]);
 498         XFreeCursor(dpy, cursor[CurMove]);
 499         while(mons)
 500                 cleanupmon(mons);
 501         XSync(dpy, False);
 502         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 503         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 504 }
 505
 506 void
 507 cleanupmon(Monitor *mon) {
 508         Monitor *m;
 509
 510         if(mon == mons)
 511                 mons = mons->next;
 512         else {
 513                 for(m = mons; m && m->next != mon; m = m->next);
 514                 m->next = mon->next;
 515         }
 516         XUnmapWindow(dpy, mon->barwin);
 517         XDestroyWindow(dpy, mon->barwin);
 518         free(mon);
 519 }
 520
 521 void
 522 clearurgent(Client *c) {
 523         XWMHints *wmh;
 524
 525         c->isurgent = False;
 526         if(!(wmh = XGetWMHints(dpy, c->win)))
 527                 return;
 528         wmh->flags &= ~XUrgencyHint;
 529         XSetWMHints(dpy, c->win, wmh);
 530         XFree(wmh);
 531 }
 532
 533 void
 534 clientmessage(XEvent *e) {
 535         XClientMessageEvent *cme = &e->xclient;
 536         Client *c = wintoclient(cme->window);
 537
 538         if(!c)
 539                 return;
 540         if(cme->message_type == netatom[NetWMState]) {
 541                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 542                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 543                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 544         }
 545         else if(cme->message_type == netatom[NetActiveWindow]) {
 546                 if(!ISVISIBLE(c)) {
 547                         c->mon->seltags ^= 1;
 548                         c->mon->tagset[c->mon->seltags] = c->tags;
 549                 }
 550                 pop(c);
 551         }
 552 }
 553
 554 void
 555 configure(Client *c) {
 556         XConfigureEvent ce;
 557
 558         ce.type = ConfigureNotify;
 559         ce.display = dpy;
 560         ce.event = c->win;
 561         ce.window = c->win;
 562         ce.x = c->x;
 563         ce.y = c->y;
 564         ce.width = c->w;
 565         ce.height = c->h;
 566         ce.border_width = c->bw;
 567         ce.above = None;
 568         ce.override_redirect = False;
 569         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 570 }
 571
 572 void
 573 configurenotify(XEvent *e) {
 574         Monitor *m;
 575         XConfigureEvent *ev = &e->xconfigure;
 576         Bool dirty;
 577
 578         // TODO: updategeom handling sucks, needs to be simplified
 579         if(ev->window == root) {
 580                 dirty = (sw != ev->width || sh != ev->height);
 581                 sw = ev->width;
 582                 sh = ev->height;
 583                 if(updategeom() || dirty) {
 584                         if(dc.drawable != 0)
 585                                 XFreePixmap(dpy, dc.drawable);
 586                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 587                         updatebars();
 588                         for(m = mons; m; m = m->next)
 589                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 590                         focus(NULL);
 591                         arrange(NULL);
 592                 }
 593         }
 594 }
 595
 596 void
 597 configurerequest(XEvent *e) {
 598         Client *c;
 599         Monitor *m;
 600         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 601         XWindowChanges wc;
 602
 603         if((c = wintoclient(ev->window))) {
 604                 if(ev->value_mask & CWBorderWidth)
 605                         c->bw = ev->border_width;
 606                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 607                         m = c->mon;
 608                         if(ev->value_mask & CWX) {
 609                                 c->oldx = c->x;
 610                                 c->x = m->mx + ev->x;
 611                         }
 612                         if(ev->value_mask & CWY) {
 613                                 c->oldy = c->y;
 614                                 c->y = m->my + ev->y;
 615                         }
 616                         if(ev->value_mask & CWWidth) {
 617                                 c->oldw = c->w;
 618                                 c->w = ev->width;
 619                         }
 620                         if(ev->value_mask & CWHeight) {
 621                                 c->oldh = c->h;
 622                                 c->h = ev->height;
 623                         }
 624                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 625                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 626                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 627                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 628                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 629                                 configure(c);
 630                         if(ISVISIBLE(c))
 631                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 632                 }
 633                 else
 634                         configure(c);
 635         }
 636         else {
 637                 wc.x = ev->x;
 638                 wc.y = ev->y;
 639                 wc.width = ev->width;
 640                 wc.height = ev->height;
 641                 wc.border_width = ev->border_width;
 642                 wc.sibling = ev->above;
 643                 wc.stack_mode = ev->detail;
 644                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 645         }
 646         XSync(dpy, False);
 647 }
 648
 649 Monitor *
 650 createmon(void) {
 651         Monitor *m;
 652
 653         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 654                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 655         m->tagset[0] = m->tagset[1] = 1;
 656         m->mfact = mfact;
 657         m->nmaster = nmaster;
 658         m->showbar = showbar;
 659         m->topbar = topbar;
 660         m->lt[0] = &layouts[0];
 661         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 662         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 663         return m;
 664 }
 665
 666 void
 667 destroynotify(XEvent *e) {
 668         Client *c;
 669         XDestroyWindowEvent *ev = &e->xdestroywindow;
 670
 671         if((c = wintoclient(ev->window)))
 672                 unmanage(c, True);
 673 }
 674
 675 void
 676 detach(Client *c) {
 677         Client **tc;
 678
 679         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 680         *tc = c->next;
 681 }
 682
 683 void
 684 detachstack(Client *c) {
 685         Client **tc, *t;
 686
 687         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 688         *tc = c->snext;
 689
 690         if(c == c->mon->sel) {
 691                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 692                 c->mon->sel = t;
 693         }
 694 }
 695
 696 void
 697 die(const char *errstr, ...) {
 698         va_list ap;
 699
 700         va_start(ap, errstr);
 701         vfprintf(stderr, errstr, ap);
 702         va_end(ap);
 703         exit(EXIT_FAILURE);
 704 }
 705
 706 Monitor *
 707 dirtomon(int dir) {
 708         Monitor *m = NULL;
 709
 710         if(dir > 0) {
 711                 if(!(m = selmon->next))
 712                         m = mons;
 713         }
 714         else if(selmon == mons)
 715                 for(m = mons; m->next; m = m->next);
 716         else
 717                 for(m = mons; m->next != selmon; m = m->next);
 718         return m;
 719 }
 720
 721 void
 722 drawbar(Monitor *m) {
 723         int x;
 724         unsigned int i, occ = 0, urg = 0;
 725         XftColor *col;
 726         Client *c;
 727
 728         for(c = m->clients; c; c = c->next) {
 729                 occ |= c->tags;
 730                 if(c->isurgent)
 731                         urg |= c->tags;
 732         }
 733         dc.x = 0;
 734         for(i = 0; i < LENGTH(tags); i++) {
 735                 dc.w = TEXTW(tags[i]);
 736                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 737                 drawtext(tags[i], col, urg & 1 << i);
 738                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 739                            occ & 1 << i, urg & 1 << i, col);
 740                 dc.x += dc.w;
 741         }
 742         dc.w = blw = TEXTW(m->ltsymbol);
 743         drawtext(m->ltsymbol, dc.norm, False);
 744         dc.x += dc.w;
 745         x = dc.x;
 746         if(m == selmon) { /* status is only drawn on selected monitor */
 747                 dc.w = TEXTW(stext);
 748                 dc.x = m->ww - dc.w;
 749                 if(dc.x < x) {
 750                         dc.x = x;
 751                         dc.w = m->ww - x;
 752                 }
 753                 drawtext(stext, dc.norm, False);
 754         }
 755         else
 756                 dc.x = m->ww;
 757         if((dc.w = dc.x - x) > bh) {
 758                 dc.x = x;
 759                 if(m->sel) {
 760                         col = m == selmon ? dc.sel : dc.norm;
 761                         drawtext(m->sel->name, col, False);
 762                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 763                 }
 764                 else
 765                         drawtext(NULL, dc.norm, False);
 766         }
 767         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 768         XSync(dpy, False);
 769 }
 770
 771 void
 772 drawbars(void) {
 773         Monitor *m;
 774
 775         for(m = mons; m; m = m->next)
 776                 drawbar(m);
 777 }
 778
 779 void
 780 drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]) {
 781         int x;
 782
 783         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG].pixel);
 784         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 785         if(filled)
 786                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 787         else if(empty)
 788                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 789 }
 790
 791 void
 792 drawtext(const char *text, XftColor col[ColLast], Bool invert) {
 793         char buf[256];
 794         int i, x, y, h, len, olen;
 795         XftDraw *d;
 796
 797         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG].pixel);
 798         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 799         if(!text)
 800                 return;
 801         olen = strlen(text);
 802         h = dc.font.ascent + dc.font.descent;
 803         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 804         x = dc.x + (h / 2);
 805         /* shorten text if necessary */
 806         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 807         if(!len)
 808                 return;
 809         memcpy(buf, text, len);
 810         if(len < olen)
 811                 for(i = len; i && i > len - 3; buf[--i] = '.');
 812
 813         d = XftDrawCreate(dpy, dc.drawable, DefaultVisual(dpy, screen), DefaultColormap(dpy,screen));
 814
 815         XftDrawStringUtf8(d, &col[invert ? ColBG : ColFG], dc.font.xfont, x, y, (XftChar8 *) buf, len);
 816         XftDrawDestroy(d);
 817 }
 818
 819 void
 820 enternotify(XEvent *e) {
 821         Client *c;
 822         Monitor *m;
 823         XCrossingEvent *ev = &e->xcrossing;
 824
 825         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 826                 return;
 827         c = wintoclient(ev->window);
 828         m = c ? c->mon : wintomon(ev->window);
 829         if(m != selmon) {
 830                 unfocus(selmon->sel, True);
 831                 selmon = m;
 832         }
 833         else if(!c || c == selmon->sel)
 834                 return;
 835         focus(c);
 836 }
 837
 838 void
 839 expose(XEvent *e) {
 840         Monitor *m;
 841         XExposeEvent *ev = &e->xexpose;
 842
 843         if(ev->count == 0 && (m = wintomon(ev->window)))
 844                 drawbar(m);
 845 }
 846
 847 void
 848 focus(Client *c) {
 849         if(!c || !ISVISIBLE(c))
 850                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 851         /* was if(selmon->sel) */
 852         if(selmon->sel && selmon->sel != c)
 853                 unfocus(selmon->sel, False);
 854         if(c) {
 855                 if(c->mon != selmon)
 856                         selmon = c->mon;
 857                 if(c->isurgent)
 858                         clearurgent(c);
 859                 detachstack(c);
 860                 attachstack(c);
 861                 grabbuttons(c, True);
 862                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder].pixel);
 863                 setfocus(c);
 864         }
 865         else {
 866                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 867                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 868         }
 869         selmon->sel = c;
 870         drawbars();
 871 }
 872
 873 void
 874 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 875         XFocusChangeEvent *ev = &e->xfocus;
 876
 877         if(selmon->sel && ev->window != selmon->sel->win)
 878                 setfocus(selmon->sel);
 879 }
 880
 881 void
 882 focusmon(const Arg *arg) {
 883         Monitor *m;
 884
 885         if(!mons->next)
 886                 return;
 887         if((m = dirtomon(arg->i)) == selmon)
 888                 return;
 889         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 890                                         in gedit and anjuta */
 891         selmon = m;
 892         focus(NULL);
 893 }
 894
 895 void
 896 focusstack(const Arg *arg) {
 897         Client *c = NULL, *i;
 898
 899         if(!selmon->sel)
 900                 return;
 901         if(arg->i > 0) {
 902                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 903                 if(!c)
 904                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 905         }
 906         else {
 907                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 908                         if(ISVISIBLE(i))
 909                                 c = i;
 910                 if(!c)
 911                         for(; i; i = i->next)
 912                                 if(ISVISIBLE(i))
 913                                         c = i;
 914         }
 915         if(c) {
 916                 focus(c);
 917                 restack(selmon);
 918         }
 919 }
 920
 921 Atom
 922 getatomprop(Client *c, Atom prop) {
 923         int di;
 924         unsigned long dl;
 925         unsigned char *p = NULL;
 926         Atom da, atom = None;
 927
 928         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 929                               &da, &di, &dl, &dl, &p) == Success && p) {
 930                 atom = *(Atom *)p;
 931                 XFree(p);
 932         }
 933         return atom;
 934 }
 935
 936 XftColor
 937 getcolor(const char *colstr) {
 938         XftColor color;
 939
 940         if(!XftColorAllocName(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), colstr, &color))
 941                 die("error, cannot allocate color '%s'\n", colstr);
 942
 943         return color;
 944 }
 945
 946 Bool
 947 getrootptr(int *x, int *y) {
 948         int di;
 949         unsigned int dui;
 950         Window dummy;
 951
 952         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 953 }
 954
 955 long
 956 getstate(Window w) {
 957         int format;
 958         long result = -1;
 959         unsigned char *p = NULL;
 960         unsigned long n, extra;
 961         Atom real;
 962
 963         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 964                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 965                 return -1;
 966         if(n != 0)
 967                 result = *p;
 968         XFree(p);
 969         return result;
 970 }
 971
 972 Bool
 973 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 974         char **list = NULL;
 975         int n;
 976         XTextProperty name;
 977
 978         if(!text || size == 0)
 979                 return False;
 980         text[0] = '\0';
 981         XGetTextProperty(dpy, w, &name, atom);
 982         if(!name.nitems)
 983                 return False;
 984         if(name.encoding == XA_STRING)
 985                 strncpy(text, (char *)name.value, size - 1);
 986         else {
 987                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 988                         strncpy(text, *list, size - 1);
 989                         XFreeStringList(list);
 990                 }
 991         }
 992         text[size - 1] = '\0';
 993         XFree(name.value);
 994         return True;
 995 }
 996
 997 void
 998 grabbuttons(Client *c, Bool focused) {
 999         updatenumlockmask();
1000         {
1001                 unsigned int i, j;
1002                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1003                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1004                 if(focused) {
1005                         for(i = 0; i < LENGTH(buttons); i++)
1006                                 if(buttons[i].click == ClkClientWin)
1007                                         for(j = 0; j < LENGTH(modifiers); j++)
1008                                                 XGrabButton(dpy, buttons[i].button,
1009                                                             buttons[i].mask | modifiers[j],
1010                                                             c->win, False, BUTTONMASK,
1011                                                             GrabModeAsync, GrabModeSync, None, None);
1012                 }
1013                 else
1014                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1015                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1016         }
1017 }
1018
1019 void
1020 grabkeys(void) {
1021         updatenumlockmask();
1022         {
1023                 unsigned int i, j;
1024                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1025                 KeyCode code;
1026
1027                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1028                 for(i = 0; i < LENGTH(keys); i++)
1029                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1030                                 for(j = 0; j < LENGTH(modifiers); j++)
1031                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1032                                                  True, GrabModeAsync, GrabModeAsync);
1033         }
1034 }
1035
1036 void
1037 incnmaster(const Arg *arg) {
1038         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1039         arrange(selmon);
1040 }
1041
1042 void
1043 initfont(const char *fontstr) {
1044
1045         if(!(dc.font.xfont = XftFontOpenName(dpy,screen,fontstr))
1046         && !(dc.font.xfont = XftFontOpenName(dpy,screen,"fixed")))
1047                 die("error, cannot load font: '%s'\n", fontstr);
1048
1049         dc.font.ascent = dc.font.xfont->ascent;
1050         dc.font.descent = dc.font.xfont->descent;
1051         dc.font.height = dc.font.ascent + dc.font.descent;
1052 }
1053
1054 #ifdef XINERAMA
1055 static Bool
1056 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1057         while(n--)
1058                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1059                 && unique[n].width == info->width && unique[n].height == info->height)
1060                         return False;
1061         return True;
1062 }
1063 #endif /* XINERAMA */
1064
1065 void
1066 keypress(XEvent *e) {
1067         unsigned int i;
1068         KeySym keysym;
1069         XKeyEvent *ev;
1070
1071         ev = &e->xkey;
1072         keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1073         for(i = 0; i < LENGTH(keys); i++)
1074                 if(keysym == keys[i].keysym
1075                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1076                 && keys[i].func)
1077                         keys[i].func(&(keys[i].arg));
1078 }
1079
1080 void
1081 killclient(const Arg *arg) {
1082         if(!selmon->sel)
1083                 return;
1084         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1085                 XGrabServer(dpy);
1086                 XSetErrorHandler(xerrordummy);
1087                 XSetCloseDownMode(dpy, DestroyAll);
1088                 XKillClient(dpy, selmon->sel->win);
1089                 XSync(dpy, False);
1090                 XSetErrorHandler(xerror);
1091                 XUngrabServer(dpy);
1092         }
1093 }
1094
1095 void
1096 manage(Window w, XWindowAttributes *wa) {
1097         Client *c, *t = NULL;
1098         Window trans = None;
1099         XWindowChanges wc;
1100
1101         if(!(c = calloc(1, sizeof(Client))))
1102                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1103         c->win = w;
1104         updatetitle(c);
1105         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1106                 c->mon = t->mon;
1107                 c->tags = t->tags;
1108         }
1109         else {
1110                 c->mon = selmon;
1111                 applyrules(c);
1112         }
1113         /* geometry */
1114         c->x = c->oldx = wa->x;
1115         c->y = c->oldy = wa->y;
1116         c->w = c->oldw = wa->width;
1117         c->h = c->oldh = wa->height;
1118         c->oldbw = wa->border_width;
1119
1120         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1121                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1122         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1123                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1124         c->x = MAX(c->x, c->mon->mx);
1125         /* only fix client y-offset, if the client center might cover the bar */
1126         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1127                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1128         c->bw = borderpx;
1129
1130         wc.border_width = c->bw;
1131         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1132         XSetWindowBorder(dpy, w, dc.norm[ColBorder].pixel);
1133         configure(c); /* propagates border_width, if size doesn't change */
1134         updatewindowtype(c);
1135         updatesizehints(c);
1136         updatewmhints(c);
1137         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1138         grabbuttons(c, False);
1139         if(!c->isfloating)
1140                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1141         if(c->isfloating)
1142                 XRaiseWindow(dpy, c->win);
1143         attach(c);
1144         attachstack(c);
1145         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1146                         (unsigned char *) &(c->win), 1);
1147         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1148         setclientstate(c, NormalState);
1149         if (c->mon == selmon)
1150                 unfocus(selmon->sel, False);
1151         c->mon->sel = c;
1152         arrange(c->mon);
1153         XMapWindow(dpy, c->win);
1154         focus(NULL);
1155 }
1156
1157 void
1158 mappingnotify(XEvent *e) {
1159         XMappingEvent *ev = &e->xmapping;
1160
1161         XRefreshKeyboardMapping(ev);
1162         if(ev->request == MappingKeyboard)
1163                 grabkeys();
1164 }
1165
1166 void
1167 maprequest(XEvent *e) {
1168         static XWindowAttributes wa;
1169         XMapRequestEvent *ev = &e->xmaprequest;
1170
1171         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1172                 return;
1173         if(wa.override_redirect)
1174                 return;
1175         if(!wintoclient(ev->window))
1176                 manage(ev->window, &wa);
1177 }
1178
1179 void
1180 monocle(Monitor *m) {
1181         unsigned int n = 0;
1182         Client *c;
1183
1184         for(c = m->clients; c; c = c->next)
1185                 if(ISVISIBLE(c))
1186                         n++;
1187         if(n > 0) /* override layout symbol */
1188                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1189         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1190                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1191 }
1192
1193 void
1194 motionnotify(XEvent *e) {
1195         static Monitor *mon = NULL;
1196         Monitor *m;
1197         XMotionEvent *ev = &e->xmotion;
1198
1199         if(ev->window != root)
1200                 return;
1201         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1202                 unfocus(selmon->sel, True);
1203                 selmon = m;
1204                 focus(NULL);
1205         }
1206         mon = m;
1207 }
1208
1209 void
1210 movemouse(const Arg *arg) {
1211         int x, y, ocx, ocy, nx, ny;
1212         Client *c;
1213         Monitor *m;
1214         XEvent ev;
1215
1216         if(!(c = selmon->sel))
1217                 return;
1218         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1219                 return;
1220         restack(selmon);
1221         ocx = c->x;
1222         ocy = c->y;
1223         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1224         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1225                 return;
1226         if(!getrootptr(&x, &y))
1227                 return;
1228         do {
1229                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1230                 switch(ev.type) {
1231                 case ConfigureRequest:
1232                 case Expose:
1233                 case MapRequest:
1234                         handler[ev.type](&ev);
1235                         break;
1236                 case MotionNotify:
1237                         nx = ocx + (ev.xmotion.x - x);
1238                         ny = ocy + (ev.xmotion.y - y);
1239                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1240                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1241                                 if(abs(selmon->wx - nx) < snap)
1242                                         nx = selmon->wx;
1243                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1244                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1245                                 if(abs(selmon->wy - ny) < snap)
1246                                         ny = selmon->wy;
1247                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1248                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1249                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1250                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1251                                         togglefloating(NULL);
1252                         }
1253                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1254                                 resize(c, nx, ny, c->w, c->h, True);
1255                         break;
1256                 }
1257         } while(ev.type != ButtonRelease);
1258         XUngrabPointer(dpy, CurrentTime);
1259         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1260                 sendmon(c, m);
1261                 selmon = m;
1262                 focus(NULL);
1263         }
1264 }
1265
1266 Client *
1267 nexttiled(Client *c) {
1268         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1269         return c;
1270 }
1271
1272 void
1273 pop(Client *c) {
1274         detach(c);
1275         attach(c);
1276         focus(c);
1277         arrange(c->mon);
1278 }
1279
1280 void
1281 propertynotify(XEvent *e) {
1282         Client *c;
1283         Window trans;
1284         XPropertyEvent *ev = &e->xproperty;
1285
1286         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1287                 updatestatus();
1288         else if(ev->state == PropertyDelete)
1289                 return; /* ignore */
1290         else if((c = wintoclient(ev->window))) {
1291                 switch(ev->atom) {
1292                 default: break;
1293                 case XA_WM_TRANSIENT_FOR:
1294                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1295                            (c->isfloating = (wintoclient(trans)) != NULL))
1296                                 arrange(c->mon);
1297                         break;
1298                 case XA_WM_NORMAL_HINTS:
1299                         updatesizehints(c);
1300                         break;
1301                 case XA_WM_HINTS:
1302                         updatewmhints(c);
1303                         drawbars();
1304                         break;
1305                 }
1306                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1307                         updatetitle(c);
1308                         if(c == c->mon->sel)
1309                                 drawbar(c->mon);
1310                 }
1311                 if(ev->atom == netatom[NetWMWindowType])
1312                         updatewindowtype(c);
1313         }
1314 }
1315
1316 void
1317 quit(const Arg *arg) {
1318         running = False;
1319 }
1320
1321 Monitor *
1322 recttomon(int x, int y, int w, int h) {
1323         Monitor *m, *r = selmon;
1324         int a, area = 0;
1325
1326         for(m = mons; m; m = m->next)
1327                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1328                         area = a;
1329                         r = m;
1330                 }
1331         return r;
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         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1365                 return;
1366         restack(selmon);
1367         ocx = c->x;
1368         ocy = c->y;
1369         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1370                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1371                 return;
1372         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1373         do {
1374                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1375                 switch(ev.type) {
1376                 case ConfigureRequest:
1377                 case Expose:
1378                 case MapRequest:
1379                         handler[ev.type](&ev);
1380                         break;
1381                 case MotionNotify:
1382                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1383                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1384                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1385                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1386                         {
1387                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1388                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1389                                         togglefloating(NULL);
1390                         }
1391                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1392                                 resize(c, c->x, c->y, nw, nh, True);
1393                         break;
1394                 }
1395         } while(ev.type != ButtonRelease);
1396         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1397         XUngrabPointer(dpy, CurrentTime);
1398         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1399         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1400                 sendmon(c, m);
1401                 selmon = m;
1402                 focus(NULL);
1403         }
1404 }
1405
1406 void
1407 restack(Monitor *m) {
1408         Client *c;
1409         XEvent ev;
1410         XWindowChanges wc;
1411
1412         drawbar(m);
1413         if(!m->sel)
1414                 return;
1415         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1416                 XRaiseWindow(dpy, m->sel->win);
1417         if(m->lt[m->sellt]->arrange) {
1418                 wc.stack_mode = Below;
1419                 wc.sibling = m->barwin;
1420                 for(c = m->stack; c; c = c->snext)
1421                         if(!c->isfloating && ISVISIBLE(c)) {
1422                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1423                                 wc.sibling = c->win;
1424                         }
1425         }
1426         XSync(dpy, False);
1427         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1428 }
1429
1430 void
1431 run(void) {
1432         XEvent ev;
1433         /* main event loop */
1434         XSync(dpy, False);
1435         while(running && !XNextEvent(dpy, &ev))
1436                 if(handler[ev.type])
1437                         handler[ev.type](&ev); /* call handler */
1438 }
1439
1440 void
1441 scan(void) {
1442         unsigned int i, num;
1443         Window d1, d2, *wins = NULL;
1444         XWindowAttributes wa;
1445
1446         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1447                 for(i = 0; i < num; i++) {
1448                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1449                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1450                                 continue;
1451                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1452                                 manage(wins[i], &wa);
1453                 }
1454                 for(i = 0; i < num; i++) { /* now the transients */
1455                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1456                                 continue;
1457                         if(XGetTransientForHint(dpy, wins[i], &d1)
1458                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1459                                 manage(wins[i], &wa);
1460                 }
1461                 if(wins)
1462                         XFree(wins);
1463         }
1464 }
1465
1466 void
1467 sendmon(Client *c, Monitor *m) {
1468         if(c->mon == m)
1469                 return;
1470         unfocus(c, True);
1471         detach(c);
1472         detachstack(c);
1473         c->mon = m;
1474         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1475         attach(c);
1476         attachstack(c);
1477         focus(NULL);
1478         arrange(NULL);
1479 }
1480
1481 void
1482 setclientstate(Client *c, long state) {
1483         long data[] = { state, None };
1484
1485         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1486                         PropModeReplace, (unsigned char *)data, 2);
1487 }
1488
1489 Bool
1490 sendevent(Client *c, Atom proto) {
1491         int n;
1492         Atom *protocols;
1493         Bool exists = False;
1494         XEvent ev;
1495
1496         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1497                 while(!exists && n--)
1498                         exists = protocols[n] == proto;
1499                 XFree(protocols);
1500         }
1501         if(exists) {
1502                 ev.type = ClientMessage;
1503                 ev.xclient.window = c->win;
1504                 ev.xclient.message_type = wmatom[WMProtocols];
1505                 ev.xclient.format = 32;
1506                 ev.xclient.data.l[0] = proto;
1507                 ev.xclient.data.l[1] = CurrentTime;
1508                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1509         }
1510         return exists;
1511 }
1512
1513 void
1514 setfocus(Client *c) {
1515         if(!c->neverfocus) {
1516                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1517                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1518                                 XA_WINDOW, 32, PropModeReplace,
1519                                 (unsigned char *) &(c->win), 1);
1520         }
1521         sendevent(c, wmatom[WMTakeFocus]);
1522 }
1523
1524 void
1525 setfullscreen(Client *c, Bool fullscreen) {
1526         if(fullscreen) {
1527                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1528                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1529                 c->isfullscreen = True;
1530                 c->oldstate = c->isfloating;
1531                 c->oldbw = c->bw;
1532                 c->bw = 0;
1533                 c->isfloating = True;
1534                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1535                 XRaiseWindow(dpy, c->win);
1536         }
1537         else {
1538                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1539                                 PropModeReplace, (unsigned char*)0, 0);
1540                 c->isfullscreen = False;
1541                 c->isfloating = c->oldstate;
1542                 c->bw = c->oldbw;
1543                 c->x = c->oldx;
1544                 c->y = c->oldy;
1545                 c->w = c->oldw;
1546                 c->h = c->oldh;
1547                 resizeclient(c, c->x, c->y, c->w, c->h);
1548                 arrange(c->mon);
1549         }
1550 }
1551
1552 void
1553 setlayout(const Arg *arg) {
1554         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1555                 selmon->sellt ^= 1;
1556         if(arg && arg->v)
1557                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1558         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1559         if(selmon->sel)
1560                 arrange(selmon);
1561         else
1562                 drawbar(selmon);
1563 }
1564
1565 /* arg > 1.0 will set mfact absolutly */
1566 void
1567 setmfact(const Arg *arg) {
1568         float f;
1569
1570         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1571                 return;
1572         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1573         if(f < 0.1 || f > 0.9)
1574                 return;
1575         selmon->mfact = f;
1576         arrange(selmon);
1577 }
1578
1579 void
1580 setup(void) {
1581         XSetWindowAttributes wa;
1582
1583         /* clean up any zombies immediately */
1584         sigchld(0);
1585
1586         /* init screen */
1587         screen = DefaultScreen(dpy);
1588         root = RootWindow(dpy, screen);
1589         initfont(font);
1590         sw = DisplayWidth(dpy, screen);
1591         sh = DisplayHeight(dpy, screen);
1592         bh = dc.h = dc.font.height + 2;
1593         updategeom();
1594         /* init atoms */
1595         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1596         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1597         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1598         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1599         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1600         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1601         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1602         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1603         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1604         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1605         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1606         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1607         /* init cursors */
1608         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1609         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1610         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1611         /* init appearance */
1612         dc.norm[ColBorder] = getcolor(normbordercolor);
1613         dc.norm[ColBG] = getcolor(normbgcolor);
1614         dc.norm[ColFG] = getcolor(normfgcolor);
1615         dc.sel[ColBorder] = getcolor(selbordercolor);
1616         dc.sel[ColBG] = getcolor(selbgcolor);
1617         dc.sel[ColFG] = getcolor(selfgcolor);
1618         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1619         dc.gc = XCreateGC(dpy, root, 0, NULL);
1620         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1621         /* init bars */
1622         updatebars();
1623         updatestatus();
1624         /* EWMH support per view */
1625         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1626                         PropModeReplace, (unsigned char *) netatom, NetLast);
1627         XDeleteProperty(dpy, root, netatom[NetClientList]);
1628         /* select for events */
1629         wa.cursor = cursor[CurNormal];
1630         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1631                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1632         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1633         XSelectInput(dpy, root, wa.event_mask);
1634         grabkeys();
1635 }
1636
1637 void
1638 showhide(Client *c) {
1639         if(!c)
1640                 return;
1641         if(ISVISIBLE(c)) { /* show clients top down */
1642                 XMoveWindow(dpy, c->win, c->x, c->y);
1643                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1644                         resize(c, c->x, c->y, c->w, c->h, False);
1645                 showhide(c->snext);
1646         }
1647         else { /* hide clients bottom up */
1648                 showhide(c->snext);
1649                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1650         }
1651 }
1652
1653 void
1654 sigchld(int unused) {
1655         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1656                 die("Can't install SIGCHLD handler");
1657         while(0 < waitpid(-1, NULL, WNOHANG));
1658 }
1659
1660 void
1661 spawn(const Arg *arg) {
1662         if(fork() == 0) {
1663                 if(dpy)
1664                         close(ConnectionNumber(dpy));
1665                 setsid();
1666                 execvp(((char **)arg->v)[0], (char **)arg->v);
1667                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1668                 perror(" failed");
1669                 exit(EXIT_SUCCESS);
1670         }
1671 }
1672
1673 void
1674 tag(const Arg *arg) {
1675         if(selmon->sel && arg->ui & TAGMASK) {
1676                 selmon->sel->tags = arg->ui & TAGMASK;
1677                 focus(NULL);
1678                 arrange(selmon);
1679         }
1680 }
1681
1682 void
1683 tagmon(const Arg *arg) {
1684         if(!selmon->sel || !mons->next)
1685                 return;
1686         sendmon(selmon->sel, dirtomon(arg->i));
1687 }
1688
1689 int
1690 textnw(const char *text, unsigned int len) {
1691         XGlyphInfo ext;
1692         XftTextExtentsUtf8(dpy, dc.font.xfont, (XftChar8 *) text, len, &ext);
1693         return ext.xOff;
1694 }
1695
1696 void
1697 tile(Monitor *m) {
1698         unsigned int i, n, h, mw, my, ty;
1699         Client *c;
1700
1701         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1702         if(n == 0)
1703                 return;
1704
1705         if(n > m->nmaster)
1706                 mw = m->nmaster ? m->ww * m->mfact : 0;
1707         else
1708                 mw = m->ww;
1709         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1710                 if(i < m->nmaster) {
1711                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1712                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1713                         my += HEIGHT(c);
1714                 }
1715                 else {
1716                         h = (m->wh - ty) / (n - i);
1717                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1718                         ty += HEIGHT(c);
1719                 }
1720 }
1721
1722 void
1723 togglebar(const Arg *arg) {
1724         selmon->showbar = !selmon->showbar;
1725         updatebarpos(selmon);
1726         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1727         arrange(selmon);
1728 }
1729
1730 void
1731 togglefloating(const Arg *arg) {
1732         if(!selmon->sel)
1733                 return;
1734         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1735                 return;
1736         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1737         if(selmon->sel->isfloating)
1738                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1739                        selmon->sel->w, selmon->sel->h, False);
1740         arrange(selmon);
1741 }
1742
1743 void
1744 toggletag(const Arg *arg) {
1745         unsigned int newtags;
1746
1747         if(!selmon->sel)
1748                 return;
1749         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1750         if(newtags) {
1751                 selmon->sel->tags = newtags;
1752                 focus(NULL);
1753                 arrange(selmon);
1754         }
1755 }
1756
1757 void
1758 toggleview(const Arg *arg) {
1759         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1760
1761         if(newtagset) {
1762                 selmon->tagset[selmon->seltags] = newtagset;
1763                 focus(NULL);
1764                 arrange(selmon);
1765         }
1766 }
1767
1768 void
1769 unfocus(Client *c, Bool setfocus) {
1770         if(!c)
1771                 return;
1772         grabbuttons(c, False);
1773         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder].pixel);
1774         if(setfocus) {
1775                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1776                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1777         }
1778 }
1779
1780 void
1781 unmanage(Client *c, Bool destroyed) {
1782         Monitor *m = c->mon;
1783         XWindowChanges wc;
1784
1785         /* The server grab construct avoids race conditions. */
1786         detach(c);
1787         detachstack(c);
1788         if(!destroyed) {
1789                 wc.border_width = c->oldbw;
1790                 XGrabServer(dpy);
1791                 XSetErrorHandler(xerrordummy);
1792                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1793                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1794                 setclientstate(c, WithdrawnState);
1795                 XSync(dpy, False);
1796                 XSetErrorHandler(xerror);
1797                 XUngrabServer(dpy);
1798         }
1799         free(c);
1800         focus(NULL);
1801         updateclientlist();
1802         arrange(m);
1803 }
1804
1805 void
1806 unmapnotify(XEvent *e) {
1807         Client *c;
1808         XUnmapEvent *ev = &e->xunmap;
1809
1810         if((c = wintoclient(ev->window))) {
1811                 if(ev->send_event)
1812                         setclientstate(c, WithdrawnState);
1813                 else
1814                         unmanage(c, False);
1815         }
1816 }
1817
1818 void
1819 updatebars(void) {
1820         Monitor *m;
1821         XSetWindowAttributes wa = {
1822                 .override_redirect = True,
1823                 .background_pixmap = ParentRelative,
1824                 .event_mask = ButtonPressMask|ExposureMask
1825         };
1826         for(m = mons; m; m = m->next) {
1827                 if (m->barwin)
1828                         continue;
1829                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1830                                           CopyFromParent, DefaultVisual(dpy, screen),
1831                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1832                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1833                 XMapRaised(dpy, m->barwin);
1834         }
1835 }
1836
1837 void
1838 updatebarpos(Monitor *m) {
1839         m->wy = m->my;
1840         m->wh = m->mh;
1841         if(m->showbar) {
1842                 m->wh -= bh;
1843                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1844                 m->wy = m->topbar ? m->wy + bh : m->wy;
1845         }
1846         else
1847                 m->by = -bh;
1848 }
1849
1850 void
1851 updateclientlist() {
1852         Client *c;
1853         Monitor *m;
1854
1855         XDeleteProperty(dpy, root, netatom[NetClientList]);
1856         for(m = mons; m; m = m->next)
1857                 for(c = m->clients; c; c = c->next)
1858                         XChangeProperty(dpy, root, netatom[NetClientList],
1859                                         XA_WINDOW, 32, PropModeAppend,
1860                                         (unsigned char *) &(c->win), 1);
1861 }
1862
1863 Bool
1864 updategeom(void) {
1865         Bool dirty = False;
1866
1867 #ifdef XINERAMA
1868         if(XineramaIsActive(dpy)) {
1869                 int i, j, n, nn;
1870                 Client *c;
1871                 Monitor *m;
1872                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1873                 XineramaScreenInfo *unique = NULL;
1874
1875                 for(n = 0, m = mons; m; m = m->next, n++);
1876                 /* only consider unique geometries as separate screens */
1877                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1878                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1879                 for(i = 0, j = 0; i < nn; i++)
1880                         if(isuniquegeom(unique, j, &info[i]))
1881                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1882                 XFree(info);
1883                 nn = j;
1884                 if(n <= nn) {
1885                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1886                                 for(m = mons; m && m->next; m = m->next);
1887                                 if(m)
1888                                         m->next = createmon();
1889                                 else
1890                                         mons = createmon();
1891                         }
1892                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1893                                 if(i >= n
1894                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1895                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1896                                 {
1897                                         dirty = True;
1898                                         m->num = i;
1899                                         m->mx = m->wx = unique[i].x_org;
1900                                         m->my = m->wy = unique[i].y_org;
1901                                         m->mw = m->ww = unique[i].width;
1902                                         m->mh = m->wh = unique[i].height;
1903                                         updatebarpos(m);
1904                                 }
1905                 }
1906                 else { /* less monitors available nn < n */
1907                         for(i = nn; i < n; i++) {
1908                                 for(m = mons; m && m->next; m = m->next);
1909                                 while(m->clients) {
1910                                         dirty = True;
1911                                         c = m->clients;
1912                                         m->clients = c->next;
1913                                         detachstack(c);
1914                                         c->mon = mons;
1915                                         attach(c);
1916                                         attachstack(c);
1917                                 }
1918                                 if(m == selmon)
1919                                         selmon = mons;
1920                                 cleanupmon(m);
1921                         }
1922                 }
1923                 free(unique);
1924         }
1925         else
1926 #endif /* XINERAMA */
1927         /* default monitor setup */
1928         {
1929                 if(!mons)
1930                         mons = createmon();
1931                 if(mons->mw != sw || mons->mh != sh) {
1932                         dirty = True;
1933                         mons->mw = mons->ww = sw;
1934                         mons->mh = mons->wh = sh;
1935                         updatebarpos(mons);
1936                 }
1937         }
1938         if(dirty) {
1939                 selmon = mons;
1940                 selmon = wintomon(root);
1941         }
1942         return dirty;
1943 }
1944
1945 void
1946 updatenumlockmask(void) {
1947         unsigned int i, j;
1948         XModifierKeymap *modmap;
1949
1950         numlockmask = 0;
1951         modmap = XGetModifierMapping(dpy);
1952         for(i = 0; i < 8; i++)
1953                 for(j = 0; j < modmap->max_keypermod; j++)
1954                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1955                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1956                                 numlockmask = (1 << i);
1957         XFreeModifiermap(modmap);
1958 }
1959
1960 void
1961 updatesizehints(Client *c) {
1962         long msize;
1963         XSizeHints size;
1964
1965         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1966                 /* size is uninitialized, ensure that size.flags aren't used */
1967                 size.flags = PSize;
1968         if(size.flags & PBaseSize) {
1969                 c->basew = size.base_width;
1970                 c->baseh = size.base_height;
1971         }
1972         else if(size.flags & PMinSize) {
1973                 c->basew = size.min_width;
1974                 c->baseh = size.min_height;
1975         }
1976         else
1977                 c->basew = c->baseh = 0;
1978         if(size.flags & PResizeInc) {
1979                 c->incw = size.width_inc;
1980                 c->inch = size.height_inc;
1981         }
1982         else
1983                 c->incw = c->inch = 0;
1984         if(size.flags & PMaxSize) {
1985                 c->maxw = size.max_width;
1986                 c->maxh = size.max_height;
1987         }
1988         else
1989                 c->maxw = c->maxh = 0;
1990         if(size.flags & PMinSize) {
1991                 c->minw = size.min_width;
1992                 c->minh = size.min_height;
1993         }
1994         else if(size.flags & PBaseSize) {
1995                 c->minw = size.base_width;
1996                 c->minh = size.base_height;
1997         }
1998         else
1999                 c->minw = c->minh = 0;
2000         if(size.flags & PAspect) {
2001                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2002                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2003         }
2004         else
2005                 c->maxa = c->mina = 0.0;
2006         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2007                      && c->maxw == c->minw && c->maxh == c->minh);
2008 }
2009
2010 void
2011 updatetitle(Client *c) {
2012         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2013                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2014         if(c->name[0] == '\0') /* hack to mark broken clients */
2015                 strcpy(c->name, broken);
2016 }
2017
2018 void
2019 updatestatus(void) {
2020         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2021                 strcpy(stext, "dwm-"VERSION);
2022         drawbar(selmon);
2023 }
2024
2025 void
2026 updatewindowtype(Client *c) {
2027         Atom state = getatomprop(c, netatom[NetWMState]);
2028         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2029
2030         if(state == netatom[NetWMFullscreen])
2031                 setfullscreen(c, True);
2032         if(wtype == netatom[NetWMWindowTypeDialog])
2033                 c->isfloating = True;
2034 }
2035
2036 void
2037 updatewmhints(Client *c) {
2038         XWMHints *wmh;
2039
2040         if((wmh = XGetWMHints(dpy, c->win))) {
2041                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2042                         wmh->flags &= ~XUrgencyHint;
2043                         XSetWMHints(dpy, c->win, wmh);
2044                 }
2045                 else
2046                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2047                 if(wmh->flags & InputHint)
2048                         c->neverfocus = !wmh->input;
2049                 else
2050                         c->neverfocus = False;
2051                 XFree(wmh);
2052         }
2053 }
2054
2055 void
2056 view(const Arg *arg) {
2057         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2058                 return;
2059         selmon->seltags ^= 1; /* toggle sel tagset */
2060         if(arg->ui & TAGMASK)
2061                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2062         focus(NULL);
2063         arrange(selmon);
2064 }
2065
2066 Client *
2067 wintoclient(Window w) {
2068         Client *c;
2069         Monitor *m;
2070
2071         for(m = mons; m; m = m->next)
2072                 for(c = m->clients; c; c = c->next)
2073                         if(c->win == w)
2074                                 return c;
2075         return NULL;
2076 }
2077
2078 Monitor *
2079 wintomon(Window w) {
2080         int x, y;
2081         Client *c;
2082         Monitor *m;
2083
2084         if(w == root && getrootptr(&x, &y))
2085                 return recttomon(x, y, 1, 1);
2086         for(m = mons; m; m = m->next)
2087                 if(w == m->barwin)
2088                         return m;
2089         if((c = wintoclient(w)))
2090                 return c->mon;
2091         return selmon;
2092 }
2093
2094 /* There's no way to check accesses to destroyed windows, thus those cases are
2095  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2096  * default error handler, which may call exit.  */
2097 int
2098 xerror(Display *dpy, XErrorEvent *ee) {
2099         if(ee->error_code == BadWindow
2100         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2101         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2102         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2103         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2104         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2105         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2106         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2107         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2108                 return 0;
2109         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2110                         ee->request_code, ee->error_code);
2111         return xerrorxlib(dpy, ee); /* may call exit */
2112 }
2113
2114 int
2115 xerrordummy(Display *dpy, XErrorEvent *ee) {
2116         return 0;
2117 }
2118
2119 /* Startup Error handler to check if another window manager
2120  * is already running. */
2121 int
2122 xerrorstart(Display *dpy, XErrorEvent *ee) {
2123         die("dwm: another window manager is already running\n");
2124         return -1;
2125 }
2126
2127 void
2128 zoom(const Arg *arg) {
2129         Client *c = selmon->sel;
2130
2131         if(!selmon->lt[selmon->sellt]->arrange
2132         || (selmon->sel && selmon->sel->isfloating))
2133                 return;
2134         if(c == nexttiled(selmon->clients))
2135                 if(!c || !(c = nexttiled(c->next)))
2136                         return;
2137         pop(c);
2138 }
2139
2140 int
2141 main(int argc, char *argv[]) {
2142         if(argc == 2 && !strcmp("-v", argv[1]))
2143                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2144         else if(argc != 1)
2145                 die("usage: dwm [-v]\n");
2146         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2147                 fputs("warning: no locale support\n", stderr);
2148         if(!(dpy = XOpenDisplay(NULL)))
2149                 die("dwm: cannot open display\n");
2150         checkotherwm();
2151         setup();
2152         scan();
2153         run();
2154         cleanup();
2155         XCloseDisplay(dpy);
2156         return EXIT_SUCCESS;
2157 }