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, NetClientList, 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 motionnotify(XEvent *e);
 204 static void movemouse(const Arg *arg);
 205 static Client *nexttiled(Client *c);
 206 static void pop(Client *);
 207 static void propertynotify(XEvent *e);
 208 static void quit(const Arg *arg);
 209 static Monitor *recttomon(int x, int y, int w, int h);
 210 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 211 static void resizeclient(Client *c, int x, int y, int w, int h);
 212 static void resizemouse(const Arg *arg);
 213 static void restack(Monitor *m);
 214 static void run(void);
 215 static void scan(void);
 216 static Bool sendevent(Client *c, Atom proto);
 217 static void sendmon(Client *c, Monitor *m);
 218 static void setclientstate(Client *c, long state);
 219 static void setfocus(Client *c);
 220 static void setfullscreen(Client *c, Bool fullscreen);
 221 static void setlayout(const Arg *arg);
 222 static void setmfact(const Arg *arg);
 223 static void setup(void);
 224 static void showhide(Client *c);
 225 static void sigchld(int unused);
 226 static void spawn(const Arg *arg);
 227 static void tag(const Arg *arg);
 228 static void tagmon(const Arg *arg);
 229 static int textnw(const char *text, unsigned int len);
 230 static void tile(Monitor *);
 231 static void togglebar(const Arg *arg);
 232 static void togglefloating(const Arg *arg);
 233 static void toggletag(const Arg *arg);
 234 static void toggleview(const Arg *arg);
 235 static void unfocus(Client *c, Bool setfocus);
 236 static void unmanage(Client *c, Bool destroyed);
 237 static void unmapnotify(XEvent *e);
 238 static Bool updategeom(void);
 239 static void updatebarpos(Monitor *m);
 240 static void updatebars(void);
 241 static void updateclientlist(void);
 242 static void updatenumlockmask(void);
 243 static void updatesizehints(Client *c);
 244 static void updatestatus(void);
 245 static void updatewindowtype(Client *c);
 246 static void updatetitle(Client *c);
 247 static void updatewmhints(Client *c);
 248 static void view(const Arg *arg);
 249 static Client *wintoclient(Window w);
 250 static Monitor *wintomon(Window w);
 251 static int xerror(Display *dpy, XErrorEvent *ee);
 252 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 253 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 254 static void zoom(const Arg *arg);
 255
 256 /* variables */
 257 static const char broken[] = "broken";
 258 static char stext[256];
 259 static int screen;
 260 static int sw, sh;           /* X display screen geometry width, height */
 261 static int bh, blw = 0;      /* bar geometry */
 262 static int (*xerrorxlib)(Display *, XErrorEvent *);
 263 static unsigned int numlockmask = 0;
 264 static void (*handler[LASTEvent]) (XEvent *) = {
 265         [ButtonPress] = buttonpress,
 266         [ClientMessage] = clientmessage,
 267         [ConfigureRequest] = configurerequest,
 268         [ConfigureNotify] = configurenotify,
 269         [DestroyNotify] = destroynotify,
 270         [EnterNotify] = enternotify,
 271         [Expose] = expose,
 272         [FocusIn] = focusin,
 273         [KeyPress] = keypress,
 274         [MappingNotify] = mappingnotify,
 275         [MapRequest] = maprequest,
 276         [MotionNotify] = motionnotify,
 277         [PropertyNotify] = propertynotify,
 278         [UnmapNotify] = unmapnotify
 279 };
 280 static Atom wmatom[WMLast], netatom[NetLast];
 281 static Bool running = True;
 282 static Cursor cursor[CurLast];
 283 static Display *dpy;
 284 static DC dc;
 285 static Monitor *mons = NULL, *selmon = NULL;
 286 static Window root;
 287
 288 /* configuration, allows nested code to access above variables */
 289 #include "config.h"
 290
 291 /* compile-time check if all tags fit into an unsigned int bit array. */
 292 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 293
 294 /* function implementations */
 295 void
 296 applyrules(Client *c) {
 297         const char *class, *instance;
 298         unsigned int i;
 299         const Rule *r;
 300         Monitor *m;
 301         XClassHint ch = { NULL, NULL };
 302
 303         /* rule matching */
 304         c->isfloating = c->tags = 0;
 305         XGetClassHint(dpy, c->win, &ch);
 306         class    = ch.res_class ? ch.res_class : broken;
 307         instance = ch.res_name  ? ch.res_name  : broken;
 308
 309         for(i = 0; i < LENGTH(rules); i++) {
 310                 r = &rules[i];
 311                 if((!r->title || strstr(c->name, r->title))
 312                 && (!r->class || strstr(class, r->class))
 313                 && (!r->instance || strstr(instance, r->instance)))
 314                 {
 315                         c->isfloating = r->isfloating;
 316                         c->tags |= r->tags;
 317                         for(m = mons; m && m->num != r->monitor; m = m->next);
 318                         if(m)
 319                                 c->mon = m;
 320                 }
 321         }
 322         if(ch.res_class)
 323                 XFree(ch.res_class);
 324         if(ch.res_name)
 325                 XFree(ch.res_name);
 326         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 327 }
 328
 329 Bool
 330 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 331         Bool baseismin;
 332         Monitor *m = c->mon;
 333
 334         /* set minimum possible */
 335         *w = MAX(1, *w);
 336         *h = MAX(1, *h);
 337         if(interact) {
 338                 if(*x > sw)
 339                         *x = sw - WIDTH(c);
 340                 if(*y > sh)
 341                         *y = sh - HEIGHT(c);
 342                 if(*x + *w + 2 * c->bw < 0)
 343                         *x = 0;
 344                 if(*y + *h + 2 * c->bw < 0)
 345                         *y = 0;
 346         }
 347         else {
 348                 if(*x >= m->wx + m->ww)
 349                         *x = m->wx + m->ww - WIDTH(c);
 350                 if(*y >= m->wy + m->wh)
 351                         *y = m->wy + m->wh - HEIGHT(c);
 352                 if(*x + *w + 2 * c->bw <= m->wx)
 353                         *x = m->wx;
 354                 if(*y + *h + 2 * c->bw <= m->wy)
 355                         *y = m->wy;
 356         }
 357         if(*h < bh)
 358                 *h = bh;
 359         if(*w < bh)
 360                 *w = bh;
 361         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 362                 /* see last two sentences in ICCCM 4.1.2.3 */
 363                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 364                 if(!baseismin) { /* temporarily remove base dimensions */
 365                         *w -= c->basew;
 366                         *h -= c->baseh;
 367                 }
 368                 /* adjust for aspect limits */
 369                 if(c->mina > 0 && c->maxa > 0) {
 370                         if(c->maxa < (float)*w / *h)
 371                                 *w = *h * c->maxa + 0.5;
 372                         else if(c->mina < (float)*h / *w)
 373                                 *h = *w * c->mina + 0.5;
 374                 }
 375                 if(baseismin) { /* increment calculation requires this */
 376                         *w -= c->basew;
 377                         *h -= c->baseh;
 378                 }
 379                 /* adjust for increment value */
 380                 if(c->incw)
 381                         *w -= *w % c->incw;
 382                 if(c->inch)
 383                         *h -= *h % c->inch;
 384                 /* restore base dimensions */
 385                 *w = MAX(*w + c->basew, c->minw);
 386                 *h = MAX(*h + c->baseh, c->minh);
 387                 if(c->maxw)
 388                         *w = MIN(*w, c->maxw);
 389                 if(c->maxh)
 390                         *h = MIN(*h, c->maxh);
 391         }
 392         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 393 }
 394
 395 void
 396 arrange(Monitor *m) {
 397         if(m)
 398                 showhide(m->stack);
 399         else for(m = mons; m; m = m->next)
 400                 showhide(m->stack);
 401         if(m) {
 402                 arrangemon(m);
 403                 restack(m);
 404         } else for(m = mons; m; m = m->next)
 405                 arrangemon(m);
 406 }
 407
 408 void
 409 arrangemon(Monitor *m) {
 410         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 411         if(m->lt[m->sellt]->arrange)
 412                 m->lt[m->sellt]->arrange(m);
 413 }
 414
 415 void
 416 attach(Client *c) {
 417         c->next = c->mon->clients;
 418         c->mon->clients = c;
 419 }
 420
 421 void
 422 attachstack(Client *c) {
 423         c->snext = c->mon->stack;
 424         c->mon->stack = c;
 425 }
 426
 427 void
 428 buttonpress(XEvent *e) {
 429         unsigned int i, x, click;
 430         Arg arg = {0};
 431         Client *c;
 432         Monitor *m;
 433         XButtonPressedEvent *ev = &e->xbutton;
 434
 435         click = ClkRootWin;
 436         /* focus monitor if necessary */
 437         if((m = wintomon(ev->window)) && m != selmon) {
 438                 unfocus(selmon->sel, True);
 439                 selmon = m;
 440                 focus(NULL);
 441         }
 442         if(ev->window == selmon->barwin) {
 443                 i = x = 0;
 444                 do
 445                         x += TEXTW(tags[i]);
 446                 while(ev->x >= x && ++i < LENGTH(tags));
 447                 if(i < LENGTH(tags)) {
 448                         click = ClkTagBar;
 449                         arg.ui = 1 << i;
 450                 }
 451                 else if(ev->x < x + blw)
 452                         click = ClkLtSymbol;
 453                 else if(ev->x > selmon->ww - TEXTW(stext))
 454                         click = ClkStatusText;
 455                 else
 456                         click = ClkWinTitle;
 457         }
 458         else if((c = wintoclient(ev->window))) {
 459                 focus(c);
 460                 click = ClkClientWin;
 461         }
 462         for(i = 0; i < LENGTH(buttons); i++)
 463                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 464                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 465                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 466 }
 467
 468 void
 469 checkotherwm(void) {
 470         xerrorxlib = XSetErrorHandler(xerrorstart);
 471         /* this causes an error if some other window manager is running */
 472         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 473         XSync(dpy, False);
 474         XSetErrorHandler(xerror);
 475         XSync(dpy, False);
 476 }
 477
 478 void
 479 cleanup(void) {
 480         Arg a = {.ui = ~0};
 481         Layout foo = { "", NULL };
 482         Monitor *m;
 483
 484         view(&a);
 485         selmon->lt[selmon->sellt] = &foo;
 486         for(m = mons; m; m = m->next)
 487                 while(m->stack)
 488                         unmanage(m->stack, False);
 489         if(dc.font.set)
 490                 XFreeFontSet(dpy, dc.font.set);
 491         else
 492                 XFreeFont(dpy, dc.font.xfont);
 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         unsigned long *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, unsigned long col[ColLast]) {
 781         int x;
 782
 783         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 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, unsigned long col[ColLast], Bool invert) {
 793         char buf[256];
 794         int i, x, y, h, len, olen;
 795
 796         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 797         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 798         if(!text)
 799                 return;
 800         olen = strlen(text);
 801         h = dc.font.ascent + dc.font.descent;
 802         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 803         x = dc.x + (h / 2);
 804         /* shorten text if necessary */
 805         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 806         if(!len)
 807                 return;
 808         memcpy(buf, text, len);
 809         if(len < olen)
 810                 for(i = len; i && i > len - 3; buf[--i] = '.');
 811         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 812         if(dc.font.set)
 813                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 814         else
 815                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 816 }
 817
 818 void
 819 enternotify(XEvent *e) {
 820         Client *c;
 821         Monitor *m;
 822         XCrossingEvent *ev = &e->xcrossing;
 823
 824         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 825                 return;
 826         c = wintoclient(ev->window);
 827         m = c ? c->mon : wintomon(ev->window);
 828         if(m != selmon) {
 829                 unfocus(selmon->sel, True);
 830                 selmon = m;
 831         }
 832         else if(!c || c == selmon->sel)
 833                 return;
 834         focus(c);
 835 }
 836
 837 void
 838 expose(XEvent *e) {
 839         Monitor *m;
 840         XExposeEvent *ev = &e->xexpose;
 841
 842         if(ev->count == 0 && (m = wintomon(ev->window)))
 843                 drawbar(m);
 844 }
 845
 846 void
 847 focus(Client *c) {
 848         if(!c || !ISVISIBLE(c))
 849                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 850         /* was if(selmon->sel) */
 851         if(selmon->sel && selmon->sel != c)
 852                 unfocus(selmon->sel, False);
 853         if(c) {
 854                 if(c->mon != selmon)
 855                         selmon = c->mon;
 856                 if(c->isurgent)
 857                         clearurgent(c);
 858                 detachstack(c);
 859                 attachstack(c);
 860                 grabbuttons(c, True);
 861                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 862                 setfocus(c);
 863         }
 864         else {
 865                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 866                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 867         }
 868         selmon->sel = c;
 869         drawbars();
 870 }
 871
 872 void
 873 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 874         XFocusChangeEvent *ev = &e->xfocus;
 875
 876         if(selmon->sel && ev->window != selmon->sel->win)
 877                 setfocus(selmon->sel);
 878 }
 879
 880 void
 881 focusmon(const Arg *arg) {
 882         Monitor *m;
 883
 884         if(!mons->next)
 885                 return;
 886         if((m = dirtomon(arg->i)) == selmon)
 887                 return;
 888         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 889                                         in gedit and anjuta */
 890         selmon = m;
 891         focus(NULL);
 892 }
 893
 894 void
 895 focusstack(const Arg *arg) {
 896         Client *c = NULL, *i;
 897
 898         if(!selmon->sel)
 899                 return;
 900         if(arg->i > 0) {
 901                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 902                 if(!c)
 903                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 904         }
 905         else {
 906                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 907                         if(ISVISIBLE(i))
 908                                 c = i;
 909                 if(!c)
 910                         for(; i; i = i->next)
 911                                 if(ISVISIBLE(i))
 912                                         c = i;
 913         }
 914         if(c) {
 915                 focus(c);
 916                 restack(selmon);
 917         }
 918 }
 919
 920 Atom
 921 getatomprop(Client *c, Atom prop) {
 922         int di;
 923         unsigned long dl;
 924         unsigned char *p = NULL;
 925         Atom da, atom = None;
 926
 927         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 928                               &da, &di, &dl, &dl, &p) == Success && p) {
 929                 atom = *(Atom *)p;
 930                 XFree(p);
 931         }
 932         return atom;
 933 }
 934
 935 unsigned long
 936 getcolor(const char *colstr) {
 937         Colormap cmap = DefaultColormap(dpy, screen);
 938         XColor color;
 939
 940         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 941                 die("error, cannot allocate color '%s'\n", colstr);
 942         return color.pixel;
 943 }
 944
 945 Bool
 946 getrootptr(int *x, int *y) {
 947         int di;
 948         unsigned int dui;
 949         Window dummy;
 950
 951         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 952 }
 953
 954 long
 955 getstate(Window w) {
 956         int format;
 957         long result = -1;
 958         unsigned char *p = NULL;
 959         unsigned long n, extra;
 960         Atom real;
 961
 962         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 963                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 964                 return -1;
 965         if(n != 0)
 966                 result = *p;
 967         XFree(p);
 968         return result;
 969 }
 970
 971 Bool
 972 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 973         char **list = NULL;
 974         int n;
 975         XTextProperty name;
 976
 977         if(!text || size == 0)
 978                 return False;
 979         text[0] = '\0';
 980         XGetTextProperty(dpy, w, &name, atom);
 981         if(!name.nitems)
 982                 return False;
 983         if(name.encoding == XA_STRING)
 984                 strncpy(text, (char *)name.value, size - 1);
 985         else {
 986                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 987                         strncpy(text, *list, size - 1);
 988                         XFreeStringList(list);
 989                 }
 990         }
 991         text[size - 1] = '\0';
 992         XFree(name.value);
 993         return True;
 994 }
 995
 996 void
 997 grabbuttons(Client *c, Bool focused) {
 998         updatenumlockmask();
 999         {
1000                 unsigned int i, j;
1001                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1002                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1003                 if(focused) {
1004                         for(i = 0; i < LENGTH(buttons); i++)
1005                                 if(buttons[i].click == ClkClientWin)
1006                                         for(j = 0; j < LENGTH(modifiers); j++)
1007                                                 XGrabButton(dpy, buttons[i].button,
1008                                                             buttons[i].mask | modifiers[j],
1009                                                             c->win, False, BUTTONMASK,
1010                                                             GrabModeAsync, GrabModeSync, None, None);
1011                 }
1012                 else
1013                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1014                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1015         }
1016 }
1017
1018 void
1019 grabkeys(void) {
1020         updatenumlockmask();
1021         {
1022                 unsigned int i, j;
1023                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1024                 KeyCode code;
1025
1026                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1027                 for(i = 0; i < LENGTH(keys); i++)
1028                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1029                                 for(j = 0; j < LENGTH(modifiers); j++)
1030                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1031                                                  True, GrabModeAsync, GrabModeAsync);
1032         }
1033 }
1034
1035 void
1036 incnmaster(const Arg *arg) {
1037         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1038         arrange(selmon);
1039 }
1040
1041 void
1042 initfont(const char *fontstr) {
1043         char *def, **missing;
1044         int n;
1045
1046         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1047         if(missing) {
1048                 while(n--)
1049                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1050                 XFreeStringList(missing);
1051         }
1052         if(dc.font.set) {
1053                 XFontStruct **xfonts;
1054                 char **font_names;
1055
1056                 dc.font.ascent = dc.font.descent = 0;
1057                 XExtentsOfFontSet(dc.font.set);
1058                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1059                 while(n--) {
1060                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1061                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1062                         xfonts++;
1063                 }
1064         }
1065         else {
1066                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1067                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1068                         die("error, cannot load font: '%s'\n", fontstr);
1069                 dc.font.ascent = dc.font.xfont->ascent;
1070                 dc.font.descent = dc.font.xfont->descent;
1071         }
1072         dc.font.height = dc.font.ascent + dc.font.descent;
1073 }
1074
1075 #ifdef XINERAMA
1076 static Bool
1077 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1078         while(n--)
1079                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1080                 && unique[n].width == info->width && unique[n].height == info->height)
1081                         return False;
1082         return True;
1083 }
1084 #endif /* XINERAMA */
1085
1086 void
1087 keypress(XEvent *e) {
1088         unsigned int i;
1089         KeySym keysym;
1090         XKeyEvent *ev;
1091
1092         ev = &e->xkey;
1093         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1094         for(i = 0; i < LENGTH(keys); i++)
1095                 if(keysym == keys[i].keysym
1096                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1097                 && keys[i].func)
1098                         keys[i].func(&(keys[i].arg));
1099 }
1100
1101 void
1102 killclient(const Arg *arg) {
1103         if(!selmon->sel)
1104                 return;
1105         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1106                 XGrabServer(dpy);
1107                 XSetErrorHandler(xerrordummy);
1108                 XSetCloseDownMode(dpy, DestroyAll);
1109                 XKillClient(dpy, selmon->sel->win);
1110                 XSync(dpy, False);
1111                 XSetErrorHandler(xerror);
1112                 XUngrabServer(dpy);
1113         }
1114 }
1115
1116 void
1117 manage(Window w, XWindowAttributes *wa) {
1118         Client *c, *t = NULL;
1119         Window trans = None;
1120         XWindowChanges wc;
1121
1122         if(!(c = calloc(1, sizeof(Client))))
1123                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1124         c->win = w;
1125         updatetitle(c);
1126         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1127                 c->mon = t->mon;
1128                 c->tags = t->tags;
1129         }
1130         else {
1131                 c->mon = selmon;
1132                 applyrules(c);
1133         }
1134         /* geometry */
1135         c->x = c->oldx = wa->x;
1136         c->y = c->oldy = wa->y;
1137         c->w = c->oldw = wa->width;
1138         c->h = c->oldh = wa->height;
1139         c->oldbw = wa->border_width;
1140
1141         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1142                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1143         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1144                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1145         c->x = MAX(c->x, c->mon->mx);
1146         /* only fix client y-offset, if the client center might cover the bar */
1147         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1148                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1149         c->bw = borderpx;
1150
1151         wc.border_width = c->bw;
1152         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1153         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1154         configure(c); /* propagates border_width, if size doesn't change */
1155         updatewindowtype(c);
1156         updatesizehints(c);
1157         updatewmhints(c);
1158         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1159         grabbuttons(c, False);
1160         if(!c->isfloating)
1161                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1162         if(c->isfloating)
1163                 XRaiseWindow(dpy, c->win);
1164         attach(c);
1165         attachstack(c);
1166         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1167                         (unsigned char *) &(c->win), 1);
1168         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1169         setclientstate(c, NormalState);
1170         if (c->mon == selmon)
1171                 unfocus(selmon->sel, False);
1172         c->mon->sel = c;
1173         arrange(c->mon);
1174         XMapWindow(dpy, c->win);
1175         focus(NULL);
1176 }
1177
1178 void
1179 mappingnotify(XEvent *e) {
1180         XMappingEvent *ev = &e->xmapping;
1181
1182         XRefreshKeyboardMapping(ev);
1183         if(ev->request == MappingKeyboard)
1184                 grabkeys();
1185 }
1186
1187 void
1188 maprequest(XEvent *e) {
1189         static XWindowAttributes wa;
1190         XMapRequestEvent *ev = &e->xmaprequest;
1191
1192         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1193                 return;
1194         if(wa.override_redirect)
1195                 return;
1196         if(!wintoclient(ev->window))
1197                 manage(ev->window, &wa);
1198 }
1199
1200 void
1201 monocle(Monitor *m) {
1202         unsigned int n = 0;
1203         Client *c;
1204
1205         for(c = m->clients; c; c = c->next)
1206                 if(ISVISIBLE(c))
1207                         n++;
1208         if(n > 0) /* override layout symbol */
1209                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1210         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1211                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1212 }
1213
1214 void
1215 motionnotify(XEvent *e) {
1216         static Monitor *mon = NULL;
1217         Monitor *m;
1218         XMotionEvent *ev = &e->xmotion;
1219
1220         if(ev->window != root)
1221                 return;
1222         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1223                 unfocus(selmon->sel, True);
1224                 selmon = m;
1225                 focus(NULL);
1226         }
1227         mon = m;
1228 }
1229
1230 void
1231 movemouse(const Arg *arg) {
1232         int x, y, ocx, ocy, nx, ny;
1233         Client *c;
1234         Monitor *m;
1235         XEvent ev;
1236
1237         if(!(c = selmon->sel))
1238                 return;
1239         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1240                 return;
1241         restack(selmon);
1242         ocx = c->x;
1243         ocy = c->y;
1244         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1245         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1246                 return;
1247         if(!getrootptr(&x, &y))
1248                 return;
1249         do {
1250                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1251                 switch(ev.type) {
1252                 case ConfigureRequest:
1253                 case Expose:
1254                 case MapRequest:
1255                         handler[ev.type](&ev);
1256                         break;
1257                 case MotionNotify:
1258                         nx = ocx + (ev.xmotion.x - x);
1259                         ny = ocy + (ev.xmotion.y - y);
1260                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1261                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1262                                 if(abs(selmon->wx - nx) < snap)
1263                                         nx = selmon->wx;
1264                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1265                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1266                                 if(abs(selmon->wy - ny) < snap)
1267                                         ny = selmon->wy;
1268                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1269                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1270                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1271                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1272                                         togglefloating(NULL);
1273                         }
1274                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1275                                 resize(c, nx, ny, c->w, c->h, True);
1276                         break;
1277                 }
1278         } while(ev.type != ButtonRelease);
1279         XUngrabPointer(dpy, CurrentTime);
1280         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1281                 sendmon(c, m);
1282                 selmon = m;
1283                 focus(NULL);
1284         }
1285 }
1286
1287 Client *
1288 nexttiled(Client *c) {
1289         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1290         return c;
1291 }
1292
1293 void
1294 pop(Client *c) {
1295         detach(c);
1296         attach(c);
1297         focus(c);
1298         arrange(c->mon);
1299 }
1300
1301 void
1302 propertynotify(XEvent *e) {
1303         Client *c;
1304         Window trans;
1305         XPropertyEvent *ev = &e->xproperty;
1306
1307         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1308                 updatestatus();
1309         else if(ev->state == PropertyDelete)
1310                 return; /* ignore */
1311         else if((c = wintoclient(ev->window))) {
1312                 switch(ev->atom) {
1313                 default: break;
1314                 case XA_WM_TRANSIENT_FOR:
1315                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1316                            (c->isfloating = (wintoclient(trans)) != NULL))
1317                                 arrange(c->mon);
1318                         break;
1319                 case XA_WM_NORMAL_HINTS:
1320                         updatesizehints(c);
1321                         break;
1322                 case XA_WM_HINTS:
1323                         updatewmhints(c);
1324                         drawbars();
1325                         break;
1326                 }
1327                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1328                         updatetitle(c);
1329                         if(c == c->mon->sel)
1330                                 drawbar(c->mon);
1331                 }
1332                 if(ev->atom == netatom[NetWMWindowType])
1333                         updatewindowtype(c);
1334         }
1335 }
1336
1337 void
1338 quit(const Arg *arg) {
1339         running = False;
1340 }
1341
1342 Monitor *
1343 recttomon(int x, int y, int w, int h) {
1344         Monitor *m, *r = selmon;
1345         int a, area = 0;
1346
1347         for(m = mons; m; m = m->next)
1348                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1349                         area = a;
1350                         r = m;
1351                 }
1352         return r;
1353 }
1354
1355 void
1356 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1357         if(applysizehints(c, &x, &y, &w, &h, interact))
1358                 resizeclient(c, x, y, w, h);
1359 }
1360
1361 void
1362 resizeclient(Client *c, int x, int y, int w, int h) {
1363         XWindowChanges wc;
1364
1365         c->oldx = c->x; c->x = wc.x = x;
1366         c->oldy = c->y; c->y = wc.y = y;
1367         c->oldw = c->w; c->w = wc.width = w;
1368         c->oldh = c->h; c->h = wc.height = h;
1369         wc.border_width = c->bw;
1370         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1371         configure(c);
1372         XSync(dpy, False);
1373 }
1374
1375 void
1376 resizemouse(const Arg *arg) {
1377         int ocx, ocy;
1378         int nw, nh;
1379         Client *c;
1380         Monitor *m;
1381         XEvent ev;
1382
1383         if(!(c = selmon->sel))
1384                 return;
1385         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1386                 return;
1387         restack(selmon);
1388         ocx = c->x;
1389         ocy = c->y;
1390         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1391                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1392                 return;
1393         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1394         do {
1395                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1396                 switch(ev.type) {
1397                 case ConfigureRequest:
1398                 case Expose:
1399                 case MapRequest:
1400                         handler[ev.type](&ev);
1401                         break;
1402                 case MotionNotify:
1403                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1404                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1405                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1406                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1407                         {
1408                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1409                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1410                                         togglefloating(NULL);
1411                         }
1412                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1413                                 resize(c, c->x, c->y, nw, nh, True);
1414                         break;
1415                 }
1416         } while(ev.type != ButtonRelease);
1417         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1418         XUngrabPointer(dpy, CurrentTime);
1419         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1420         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1421                 sendmon(c, m);
1422                 selmon = m;
1423                 focus(NULL);
1424         }
1425 }
1426
1427 void
1428 restack(Monitor *m) {
1429         Client *c;
1430         XEvent ev;
1431         XWindowChanges wc;
1432
1433         drawbar(m);
1434         if(!m->sel)
1435                 return;
1436         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1437                 XRaiseWindow(dpy, m->sel->win);
1438         if(m->lt[m->sellt]->arrange) {
1439                 wc.stack_mode = Below;
1440                 wc.sibling = m->barwin;
1441                 for(c = m->stack; c; c = c->snext)
1442                         if(!c->isfloating && ISVISIBLE(c)) {
1443                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1444                                 wc.sibling = c->win;
1445                         }
1446         }
1447         XSync(dpy, False);
1448         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1449 }
1450
1451 void
1452 run(void) {
1453         XEvent ev;
1454         /* main event loop */
1455         XSync(dpy, False);
1456         while(running && !XNextEvent(dpy, &ev))
1457                 if(handler[ev.type])
1458                         handler[ev.type](&ev); /* call handler */
1459 }
1460
1461 void
1462 scan(void) {
1463         unsigned int i, num;
1464         Window d1, d2, *wins = NULL;
1465         XWindowAttributes wa;
1466
1467         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1468                 for(i = 0; i < num; i++) {
1469                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1470                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1471                                 continue;
1472                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1473                                 manage(wins[i], &wa);
1474                 }
1475                 for(i = 0; i < num; i++) { /* now the transients */
1476                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1477                                 continue;
1478                         if(XGetTransientForHint(dpy, wins[i], &d1)
1479                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1480                                 manage(wins[i], &wa);
1481                 }
1482                 if(wins)
1483                         XFree(wins);
1484         }
1485 }
1486
1487 void
1488 sendmon(Client *c, Monitor *m) {
1489         if(c->mon == m)
1490                 return;
1491         unfocus(c, True);
1492         detach(c);
1493         detachstack(c);
1494         c->mon = m;
1495         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1496         attach(c);
1497         attachstack(c);
1498         focus(NULL);
1499         arrange(NULL);
1500 }
1501
1502 void
1503 setclientstate(Client *c, long state) {
1504         long data[] = { state, None };
1505
1506         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1507                         PropModeReplace, (unsigned char *)data, 2);
1508 }
1509
1510 Bool
1511 sendevent(Client *c, Atom proto) {
1512         int n;
1513         Atom *protocols;
1514         Bool exists = False;
1515         XEvent ev;
1516
1517         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1518                 while(!exists && n--)
1519                         exists = protocols[n] == proto;
1520                 XFree(protocols);
1521         }
1522         if(exists) {
1523                 ev.type = ClientMessage;
1524                 ev.xclient.window = c->win;
1525                 ev.xclient.message_type = wmatom[WMProtocols];
1526                 ev.xclient.format = 32;
1527                 ev.xclient.data.l[0] = proto;
1528                 ev.xclient.data.l[1] = CurrentTime;
1529                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1530         }
1531         return exists;
1532 }
1533
1534 void
1535 setfocus(Client *c) {
1536         if(!c->neverfocus) {
1537                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1538                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1539                                 XA_WINDOW, 32, PropModeReplace,
1540                                 (unsigned char *) &(c->win), 1);
1541         }
1542         sendevent(c, wmatom[WMTakeFocus]);
1543 }
1544
1545 void
1546 setfullscreen(Client *c, Bool fullscreen) {
1547         if(fullscreen) {
1548                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1549                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1550                 c->isfullscreen = True;
1551                 c->oldstate = c->isfloating;
1552                 c->oldbw = c->bw;
1553                 c->bw = 0;
1554                 c->isfloating = True;
1555                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1556                 XRaiseWindow(dpy, c->win);
1557         }
1558         else {
1559                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1560                                 PropModeReplace, (unsigned char*)0, 0);
1561                 c->isfullscreen = False;
1562                 c->isfloating = c->oldstate;
1563                 c->bw = c->oldbw;
1564                 c->x = c->oldx;
1565                 c->y = c->oldy;
1566                 c->w = c->oldw;
1567                 c->h = c->oldh;
1568                 resizeclient(c, c->x, c->y, c->w, c->h);
1569                 arrange(c->mon);
1570         }
1571 }
1572
1573 void
1574 setlayout(const Arg *arg) {
1575         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1576                 selmon->sellt ^= 1;
1577         if(arg && arg->v)
1578                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1579         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1580         if(selmon->sel)
1581                 arrange(selmon);
1582         else
1583                 drawbar(selmon);
1584 }
1585
1586 /* arg > 1.0 will set mfact absolutly */
1587 void
1588 setmfact(const Arg *arg) {
1589         float f;
1590
1591         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1592                 return;
1593         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1594         if(f < 0.1 || f > 0.9)
1595                 return;
1596         selmon->mfact = f;
1597         arrange(selmon);
1598 }
1599
1600 void
1601 setup(void) {
1602         XSetWindowAttributes wa;
1603
1604         /* clean up any zombies immediately */
1605         sigchld(0);
1606
1607         /* init screen */
1608         screen = DefaultScreen(dpy);
1609         root = RootWindow(dpy, screen);
1610         initfont(font);
1611         sw = DisplayWidth(dpy, screen);
1612         sh = DisplayHeight(dpy, screen);
1613         bh = dc.h = dc.font.height + 2;
1614         updategeom();
1615         /* init atoms */
1616         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1617         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1618         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1619         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1620         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1621         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1622         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1623         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1624         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1625         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1626         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1627         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1628         /* init cursors */
1629         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1630         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1631         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1632         /* init appearance */
1633         dc.norm[ColBorder] = getcolor(normbordercolor);
1634         dc.norm[ColBG] = getcolor(normbgcolor);
1635         dc.norm[ColFG] = getcolor(normfgcolor);
1636         dc.sel[ColBorder] = getcolor(selbordercolor);
1637         dc.sel[ColBG] = getcolor(selbgcolor);
1638         dc.sel[ColFG] = getcolor(selfgcolor);
1639         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1640         dc.gc = XCreateGC(dpy, root, 0, NULL);
1641         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1642         if(!dc.font.set)
1643                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1644         /* init bars */
1645         updatebars();
1646         updatestatus();
1647         /* EWMH support per view */
1648         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1649                         PropModeReplace, (unsigned char *) netatom, NetLast);
1650         XDeleteProperty(dpy, root, netatom[NetClientList]);
1651         /* select for events */
1652         wa.cursor = cursor[CurNormal];
1653         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1654                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1655         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1656         XSelectInput(dpy, root, wa.event_mask);
1657         grabkeys();
1658 }
1659
1660 void
1661 showhide(Client *c) {
1662         if(!c)
1663                 return;
1664         if(ISVISIBLE(c)) { /* show clients top down */
1665                 XMoveWindow(dpy, c->win, c->x, c->y);
1666                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1667                         resize(c, c->x, c->y, c->w, c->h, False);
1668                 showhide(c->snext);
1669         }
1670         else { /* hide clients bottom up */
1671                 showhide(c->snext);
1672                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1673         }
1674 }
1675
1676 void
1677 sigchld(int unused) {
1678         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1679                 die("Can't install SIGCHLD handler");
1680         while(0 < waitpid(-1, NULL, WNOHANG));
1681 }
1682
1683 void
1684 spawn(const Arg *arg) {
1685         if(fork() == 0) {
1686                 if(dpy)
1687                         close(ConnectionNumber(dpy));
1688                 setsid();
1689                 execvp(((char **)arg->v)[0], (char **)arg->v);
1690                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1691                 perror(" failed");
1692                 exit(EXIT_SUCCESS);
1693         }
1694 }
1695
1696 void
1697 tag(const Arg *arg) {
1698         if(selmon->sel && arg->ui & TAGMASK) {
1699                 selmon->sel->tags = arg->ui & TAGMASK;
1700                 focus(NULL);
1701                 arrange(selmon);
1702         }
1703 }
1704
1705 void
1706 tagmon(const Arg *arg) {
1707         if(!selmon->sel || !mons->next)
1708                 return;
1709         sendmon(selmon->sel, dirtomon(arg->i));
1710 }
1711
1712 int
1713 textnw(const char *text, unsigned int len) {
1714         XRectangle r;
1715
1716         if(dc.font.set) {
1717                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1718                 return r.width;
1719         }
1720         return XTextWidth(dc.font.xfont, text, len);
1721 }
1722
1723 void
1724 tile(Monitor *m) {
1725         unsigned int i, n, h, mw, my, ty;
1726         Client *c;
1727
1728         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1729         if(n == 0)
1730                 return;
1731
1732         if(n > m->nmaster)
1733                 mw = m->nmaster ? m->ww * m->mfact : 0;
1734         else
1735                 mw = m->ww;
1736         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1737                 if(i < m->nmaster) {
1738                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1739                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1740                         my += HEIGHT(c);
1741                 }
1742                 else {
1743                         h = (m->wh - ty) / (n - i);
1744                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1745                         ty += HEIGHT(c);
1746                 }
1747 }
1748
1749 void
1750 togglebar(const Arg *arg) {
1751         selmon->showbar = !selmon->showbar;
1752         updatebarpos(selmon);
1753         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1754         arrange(selmon);
1755 }
1756
1757 void
1758 togglefloating(const Arg *arg) {
1759         if(!selmon->sel)
1760                 return;
1761         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1762                 return;
1763         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1764         if(selmon->sel->isfloating)
1765                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1766                        selmon->sel->w, selmon->sel->h, False);
1767         arrange(selmon);
1768 }
1769
1770 void
1771 toggletag(const Arg *arg) {
1772         unsigned int newtags;
1773
1774         if(!selmon->sel)
1775                 return;
1776         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1777         if(newtags) {
1778                 selmon->sel->tags = newtags;
1779                 focus(NULL);
1780                 arrange(selmon);
1781         }
1782 }
1783
1784 void
1785 toggleview(const Arg *arg) {
1786         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1787
1788         if(newtagset) {
1789                 selmon->tagset[selmon->seltags] = newtagset;
1790                 focus(NULL);
1791                 arrange(selmon);
1792         }
1793 }
1794
1795 void
1796 unfocus(Client *c, Bool setfocus) {
1797         if(!c)
1798                 return;
1799         grabbuttons(c, False);
1800         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1801         if(setfocus) {
1802                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1803                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1804         }
1805 }
1806
1807 void
1808 unmanage(Client *c, Bool destroyed) {
1809         Monitor *m = c->mon;
1810         XWindowChanges wc;
1811
1812         /* The server grab construct avoids race conditions. */
1813         detach(c);
1814         detachstack(c);
1815         if(!destroyed) {
1816                 wc.border_width = c->oldbw;
1817                 XGrabServer(dpy);
1818                 XSetErrorHandler(xerrordummy);
1819                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1820                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1821                 setclientstate(c, WithdrawnState);
1822                 XSync(dpy, False);
1823                 XSetErrorHandler(xerror);
1824                 XUngrabServer(dpy);
1825         }
1826         free(c);
1827         focus(NULL);
1828         updateclientlist();
1829         arrange(m);
1830 }
1831
1832 void
1833 unmapnotify(XEvent *e) {
1834         Client *c;
1835         XUnmapEvent *ev = &e->xunmap;
1836
1837         if((c = wintoclient(ev->window))) {
1838                 if(ev->send_event)
1839                         setclientstate(c, WithdrawnState);
1840                 else
1841                         unmanage(c, False);
1842         }
1843 }
1844
1845 void
1846 updatebars(void) {
1847         Monitor *m;
1848         XSetWindowAttributes wa = {
1849                 .override_redirect = True,
1850                 .background_pixmap = ParentRelative,
1851                 .event_mask = ButtonPressMask|ExposureMask
1852         };
1853         for(m = mons; m; m = m->next) {
1854                 if (m->barwin)
1855                         continue;
1856                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1857                                           CopyFromParent, DefaultVisual(dpy, screen),
1858                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1859                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1860                 XMapRaised(dpy, m->barwin);
1861         }
1862 }
1863
1864 void
1865 updatebarpos(Monitor *m) {
1866         m->wy = m->my;
1867         m->wh = m->mh;
1868         if(m->showbar) {
1869                 m->wh -= bh;
1870                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1871                 m->wy = m->topbar ? m->wy + bh : m->wy;
1872         }
1873         else
1874                 m->by = -bh;
1875 }
1876
1877 void
1878 updateclientlist() {
1879         Client *c;
1880         Monitor *m;
1881
1882         XDeleteProperty(dpy, root, netatom[NetClientList]);
1883         for(m = mons; m; m = m->next)
1884                 for(c = m->clients; c; c = c->next)
1885                         XChangeProperty(dpy, root, netatom[NetClientList],
1886                                         XA_WINDOW, 32, PropModeAppend,
1887                                         (unsigned char *) &(c->win), 1);
1888 }
1889
1890 Bool
1891 updategeom(void) {
1892         Bool dirty = False;
1893
1894 #ifdef XINERAMA
1895         if(XineramaIsActive(dpy)) {
1896                 int i, j, n, nn;
1897                 Client *c;
1898                 Monitor *m;
1899                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1900                 XineramaScreenInfo *unique = NULL;
1901
1902                 for(n = 0, m = mons; m; m = m->next, n++);
1903                 /* only consider unique geometries as separate screens */
1904                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1905                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1906                 for(i = 0, j = 0; i < nn; i++)
1907                         if(isuniquegeom(unique, j, &info[i]))
1908                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1909                 XFree(info);
1910                 nn = j;
1911                 if(n <= nn) {
1912                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1913                                 for(m = mons; m && m->next; m = m->next);
1914                                 if(m)
1915                                         m->next = createmon();
1916                                 else
1917                                         mons = createmon();
1918                         }
1919                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1920                                 if(i >= n
1921                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1922                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1923                                 {
1924                                         dirty = True;
1925                                         m->num = i;
1926                                         m->mx = m->wx = unique[i].x_org;
1927                                         m->my = m->wy = unique[i].y_org;
1928                                         m->mw = m->ww = unique[i].width;
1929                                         m->mh = m->wh = unique[i].height;
1930                                         updatebarpos(m);
1931                                 }
1932                 }
1933                 else { /* less monitors available nn < n */
1934                         for(i = nn; i < n; i++) {
1935                                 for(m = mons; m && m->next; m = m->next);
1936                                 while(m->clients) {
1937                                         dirty = True;
1938                                         c = m->clients;
1939                                         m->clients = c->next;
1940                                         detachstack(c);
1941                                         c->mon = mons;
1942                                         attach(c);
1943                                         attachstack(c);
1944                                 }
1945                                 if(m == selmon)
1946                                         selmon = mons;
1947                                 cleanupmon(m);
1948                         }
1949                 }
1950                 free(unique);
1951         }
1952         else
1953 #endif /* XINERAMA */
1954         /* default monitor setup */
1955         {
1956                 if(!mons)
1957                         mons = createmon();
1958                 if(mons->mw != sw || mons->mh != sh) {
1959                         dirty = True;
1960                         mons->mw = mons->ww = sw;
1961                         mons->mh = mons->wh = sh;
1962                         updatebarpos(mons);
1963                 }
1964         }
1965         if(dirty) {
1966                 selmon = mons;
1967                 selmon = wintomon(root);
1968         }
1969         return dirty;
1970 }
1971
1972 void
1973 updatenumlockmask(void) {
1974         unsigned int i, j;
1975         XModifierKeymap *modmap;
1976
1977         numlockmask = 0;
1978         modmap = XGetModifierMapping(dpy);
1979         for(i = 0; i < 8; i++)
1980                 for(j = 0; j < modmap->max_keypermod; j++)
1981                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1982                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1983                                 numlockmask = (1 << i);
1984         XFreeModifiermap(modmap);
1985 }
1986
1987 void
1988 updatesizehints(Client *c) {
1989         long msize;
1990         XSizeHints size;
1991
1992         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1993                 /* size is uninitialized, ensure that size.flags aren't used */
1994                 size.flags = PSize;
1995         if(size.flags & PBaseSize) {
1996                 c->basew = size.base_width;
1997                 c->baseh = size.base_height;
1998         }
1999         else if(size.flags & PMinSize) {
2000                 c->basew = size.min_width;
2001                 c->baseh = size.min_height;
2002         }
2003         else
2004                 c->basew = c->baseh = 0;
2005         if(size.flags & PResizeInc) {
2006                 c->incw = size.width_inc;
2007                 c->inch = size.height_inc;
2008         }
2009         else
2010                 c->incw = c->inch = 0;
2011         if(size.flags & PMaxSize) {
2012                 c->maxw = size.max_width;
2013                 c->maxh = size.max_height;
2014         }
2015         else
2016                 c->maxw = c->maxh = 0;
2017         if(size.flags & PMinSize) {
2018                 c->minw = size.min_width;
2019                 c->minh = size.min_height;
2020         }
2021         else if(size.flags & PBaseSize) {
2022                 c->minw = size.base_width;
2023                 c->minh = size.base_height;
2024         }
2025         else
2026                 c->minw = c->minh = 0;
2027         if(size.flags & PAspect) {
2028                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2029                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2030         }
2031         else
2032                 c->maxa = c->mina = 0.0;
2033         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2034                      && c->maxw == c->minw && c->maxh == c->minh);
2035 }
2036
2037 void
2038 updatetitle(Client *c) {
2039         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2040                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2041         if(c->name[0] == '\0') /* hack to mark broken clients */
2042                 strcpy(c->name, broken);
2043 }
2044
2045 void
2046 updatestatus(void) {
2047         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2048                 strcpy(stext, "dwm-"VERSION);
2049         drawbar(selmon);
2050 }
2051
2052 void
2053 updatewindowtype(Client *c) {
2054         Atom state = getatomprop(c, netatom[NetWMState]);
2055         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2056
2057         if(state == netatom[NetWMFullscreen])
2058                 setfullscreen(c, True);
2059         if(wtype == netatom[NetWMWindowTypeDialog])
2060                 c->isfloating = True;
2061 }
2062
2063 void
2064 updatewmhints(Client *c) {
2065         XWMHints *wmh;
2066
2067         if((wmh = XGetWMHints(dpy, c->win))) {
2068                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2069                         wmh->flags &= ~XUrgencyHint;
2070                         XSetWMHints(dpy, c->win, wmh);
2071                 }
2072                 else
2073                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2074                 if(wmh->flags & InputHint)
2075                         c->neverfocus = !wmh->input;
2076                 else
2077                         c->neverfocus = False;
2078                 XFree(wmh);
2079         }
2080 }
2081
2082 void
2083 view(const Arg *arg) {
2084         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2085                 return;
2086         selmon->seltags ^= 1; /* toggle sel tagset */
2087         if(arg->ui & TAGMASK)
2088                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2089         focus(NULL);
2090         arrange(selmon);
2091 }
2092
2093 Client *
2094 wintoclient(Window w) {
2095         Client *c;
2096         Monitor *m;
2097
2098         for(m = mons; m; m = m->next)
2099                 for(c = m->clients; c; c = c->next)
2100                         if(c->win == w)
2101                                 return c;
2102         return NULL;
2103 }
2104
2105 Monitor *
2106 wintomon(Window w) {
2107         int x, y;
2108         Client *c;
2109         Monitor *m;
2110
2111         if(w == root && getrootptr(&x, &y))
2112                 return recttomon(x, y, 1, 1);
2113         for(m = mons; m; m = m->next)
2114                 if(w == m->barwin)
2115                         return m;
2116         if((c = wintoclient(w)))
2117                 return c->mon;
2118         return selmon;
2119 }
2120
2121 /* There's no way to check accesses to destroyed windows, thus those cases are
2122  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2123  * default error handler, which may call exit.  */
2124 int
2125 xerror(Display *dpy, XErrorEvent *ee) {
2126         if(ee->error_code == BadWindow
2127         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2128         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2129         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2130         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2131         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2132         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2133         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2134         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2135                 return 0;
2136         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2137                         ee->request_code, ee->error_code);
2138         return xerrorxlib(dpy, ee); /* may call exit */
2139 }
2140
2141 int
2142 xerrordummy(Display *dpy, XErrorEvent *ee) {
2143         return 0;
2144 }
2145
2146 /* Startup Error handler to check if another window manager
2147  * is already running. */
2148 int
2149 xerrorstart(Display *dpy, XErrorEvent *ee) {
2150         die("dwm: another window manager is already running\n");
2151         return -1;
2152 }
2153
2154 void
2155 zoom(const Arg *arg) {
2156         Client *c = selmon->sel;
2157
2158         if(!selmon->lt[selmon->sellt]->arrange
2159         || (selmon->sel && selmon->sel->isfloating))
2160                 return;
2161         if(c == nexttiled(selmon->clients))
2162                 if(!c || !(c = nexttiled(c->next)))
2163                         return;
2164         pop(c);
2165 }
2166
2167 int
2168 main(int argc, char *argv[]) {
2169         if(argc == 2 && !strcmp("-v", argv[1]))
2170                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2171         else if(argc != 1)
2172                 die("usage: dwm [-v]\n");
2173         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2174                 fputs("warning: no locale support\n", stderr);
2175         if(!(dpy = XOpenDisplay(NULL)))
2176                 die("dwm: cannot open display\n");
2177         checkotherwm();
2178         setup();
2179         scan();
2180         run();
2181         cleanup();
2182         XCloseDisplay(dpy);
2183         return EXIT_SUCCESS;
2184 }