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 #include "draw.h"
  44
  45 /* macros */
  46 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  47 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  48 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  49                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  50 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  51 #define LENGTH(X)               (sizeof X / sizeof X[0])
  52 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  53 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  54 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  55 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  56 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  57 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  58 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  59
  60 /* enums */
  61 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  62 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  63 enum { NetSupported, NetWMName, NetWMState,
  64        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  65        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  66 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  67 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  68        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  69
  70 typedef union {
  71         int i;
  72         unsigned int ui;
  73         float f;
  74         const void *v;
  75 } Arg;
  76
  77 typedef struct {
  78         unsigned int click;
  79         unsigned int mask;
  80         unsigned int button;
  81         void (*func)(const Arg *arg);
  82         const Arg arg;
  83 } Button;
  84
  85 typedef struct Monitor Monitor;
  86 typedef struct Client Client;
  87 struct Client {
  88         char name[256];
  89         float mina, maxa;
  90         int x, y, w, h;
  91         int oldx, oldy, oldw, oldh;
  92         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  93         int bw, oldbw;
  94         unsigned int tags;
  95         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  96         Client *next;
  97         Client *snext;
  98         Monitor *mon;
  99         Window win;
 100 };
 101
 102 typedef struct {
 103         int x, y, w, h;
 104         unsigned long norm[ColLast];
 105         unsigned long sel[ColLast];
 106         Drawable drawable;
 107         GC gc;
 108         struct {
 109                 int ascent;
 110                 int descent;
 111                 int height;
 112                 XFontSet set;
 113                 XFontStruct *xfont;
 114         } font;
 115 } DC; /* draw context */
 116
 117 typedef struct {
 118         unsigned int mod;
 119         KeySym keysym;
 120         void (*func)(const Arg *);
 121         const Arg arg;
 122 } Key;
 123
 124 typedef struct {
 125         const char *symbol;
 126         void (*arrange)(Monitor *);
 127 } Layout;
 128
 129 struct Monitor {
 130         char ltsymbol[16];
 131         float mfact;
 132         int nmaster;
 133         int num;
 134         int by;               /* bar geometry */
 135         int mx, my, mw, mh;   /* screen size */
 136         int wx, wy, ww, wh;   /* window area  */
 137         unsigned int seltags;
 138         unsigned int sellt;
 139         unsigned int tagset[2];
 140         Bool showbar;
 141         Bool topbar;
 142         Client *clients;
 143         Client *sel;
 144         Client *stack;
 145         Monitor *next;
 146         Window barwin;
 147         const Layout *lt[2];
 148 };
 149
 150 typedef struct {
 151         const char *class;
 152         const char *instance;
 153         const char *title;
 154         unsigned int tags;
 155         Bool isfloating;
 156         int monitor;
 157 } Rule;
 158
 159 /* function declarations */
 160 static void applyrules(Client *c);
 161 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 162 static void arrange(Monitor *m);
 163 static void arrangemon(Monitor *m);
 164 static void attach(Client *c);
 165 static void attachstack(Client *c);
 166 static void buttonpress(XEvent *e);
 167 static void checkotherwm(void);
 168 static void cleanup(void);
 169 static void cleanupmon(Monitor *mon);
 170 static void clearurgent(Client *c);
 171 static void clientmessage(XEvent *e);
 172 static void configure(Client *c);
 173 static void configurenotify(XEvent *e);
 174 static void configurerequest(XEvent *e);
 175 static Monitor *createmon(void);
 176 static void destroynotify(XEvent *e);
 177 static void detach(Client *c);
 178 static void detachstack(Client *c);
 179 static void die(const char *errstr, ...);
 180 static Monitor *dirtomon(int dir);
 181 static void drawbar(Monitor *m);
 182 static void drawbars(void);
 183 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 184 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 185 static void enternotify(XEvent *e);
 186 static void expose(XEvent *e);
 187 static void focus(Client *c);
 188 static void focusin(XEvent *e);
 189 static void focusmon(const Arg *arg);
 190 static void focusstack(const Arg *arg);
 191 static unsigned long getcolor(const char *colstr);
 192 static Bool getrootptr(int *x, int *y);
 193 static long getstate(Window w);
 194 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 195 static void grabbuttons(Client *c, Bool focused);
 196 static void grabkeys(void);
 197 static void incnmaster(const Arg *arg);
 198 static void initfont(const char *fontstr);
 199 static void keypress(XEvent *e);
 200 static void killclient(const Arg *arg);
 201 static void manage(Window w, XWindowAttributes *wa);
 202 static void mappingnotify(XEvent *e);
 203 static void maprequest(XEvent *e);
 204 static void monocle(Monitor *m);
 205 static void motionnotify(XEvent *e);
 206 static void movemouse(const Arg *arg);
 207 static Client *nexttiled(Client *c);
 208 static void pop(Client *);
 209 static void propertynotify(XEvent *e);
 210 static void quit(const Arg *arg);
 211 static Monitor *recttomon(int x, int y, int w, int h);
 212 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 213 static void resizeclient(Client *c, int x, int y, int w, int h);
 214 static void resizemouse(const Arg *arg);
 215 static void restack(Monitor *m);
 216 static void run(void);
 217 static void scan(void);
 218 static Bool sendevent(Client *c, Atom proto);
 219 static void sendmon(Client *c, Monitor *m);
 220 static void setclientstate(Client *c, long state);
 221 static void setfocus(Client *c);
 222 static void setfullscreen(Client *c, Bool fullscreen);
 223 static void setlayout(const Arg *arg);
 224 static void setmfact(const Arg *arg);
 225 static void setup(void);
 226 static void showhide(Client *c);
 227 static void sigchld(int unused);
 228 static void spawn(const Arg *arg);
 229 static void tag(const Arg *arg);
 230 static void tagmon(const Arg *arg);
 231 static int textnw(const char *text, unsigned int len);
 232 static void tile(Monitor *);
 233 static void togglebar(const Arg *arg);
 234 static void togglefloating(const Arg *arg);
 235 static void toggletag(const Arg *arg);
 236 static void toggleview(const Arg *arg);
 237 static void unfocus(Client *c, Bool setfocus);
 238 static void unmanage(Client *c, Bool destroyed);
 239 static void unmapnotify(XEvent *e);
 240 static Bool updategeom(void);
 241 static void updatebarpos(Monitor *m);
 242 static void updatebars(void);
 243 static void updateclientlist(void);
 244 static void updatenumlockmask(void);
 245 static void updatesizehints(Client *c);
 246 static void updatestatus(void);
 247 static void updatewindowtype(Client *c);
 248 static void updatetitle(Client *c);
 249 static void updatewmhints(Client *c);
 250 static void view(const Arg *arg);
 251 static Client *wintoclient(Window w);
 252 static Monitor *wintomon(Window w);
 253 static int xerror(Display *dpy, XErrorEvent *ee);
 254 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 255 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 256 static void zoom(const Arg *arg);
 257
 258 /* variables */
 259 static const char broken[] = "broken";
 260 static char stext[256];
 261 static int screen;
 262 static int sw, sh;           /* X display screen geometry width, height */
 263 static int bh, blw = 0;      /* bar geometry */
 264 static int (*xerrorxlib)(Display *, XErrorEvent *);
 265 static unsigned int numlockmask = 0;
 266 static void (*handler[LASTEvent]) (XEvent *) = {
 267         [ButtonPress] = buttonpress,
 268         [ClientMessage] = clientmessage,
 269         [ConfigureRequest] = configurerequest,
 270         [ConfigureNotify] = configurenotify,
 271         [DestroyNotify] = destroynotify,
 272         [EnterNotify] = enternotify,
 273         [Expose] = expose,
 274         [FocusIn] = focusin,
 275         [KeyPress] = keypress,
 276         [MappingNotify] = mappingnotify,
 277         [MapRequest] = maprequest,
 278         [MotionNotify] = motionnotify,
 279         [PropertyNotify] = propertynotify,
 280         [UnmapNotify] = unmapnotify
 281 };
 282 static Atom wmatom[WMLast], netatom[NetLast];
 283 static Bool running = True;
 284 static Cursor cursor[CurLast];
 285 static Display *dpy;
 286 static DC dc;
 287 static Monitor *mons = NULL, *selmon = NULL;
 288 static Window root;
 289
 290 /* configuration, allows nested code to access above variables */
 291 #include "config.h"
 292
 293 /* compile-time check if all tags fit into an unsigned int bit array. */
 294 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 295
 296 /* function implementations */
 297 void
 298 applyrules(Client *c) {
 299         const char *class, *instance;
 300         unsigned int i;
 301         const Rule *r;
 302         Monitor *m;
 303         XClassHint ch = { NULL, NULL };
 304
 305         /* rule matching */
 306         c->isfloating = c->tags = 0;
 307         XGetClassHint(dpy, c->win, &ch);
 308         class    = ch.res_class ? ch.res_class : broken;
 309         instance = ch.res_name  ? ch.res_name  : broken;
 310
 311         for(i = 0; i < LENGTH(rules); i++) {
 312                 r = &rules[i];
 313                 if((!r->title || strstr(c->name, r->title))
 314                 && (!r->class || strstr(class, r->class))
 315                 && (!r->instance || strstr(instance, r->instance)))
 316                 {
 317                         c->isfloating = r->isfloating;
 318                         c->tags |= r->tags;
 319                         for(m = mons; m && m->num != r->monitor; m = m->next);
 320                         if(m)
 321                                 c->mon = m;
 322                 }
 323         }
 324         if(ch.res_class)
 325                 XFree(ch.res_class);
 326         if(ch.res_name)
 327                 XFree(ch.res_name);
 328         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 329 }
 330
 331 Bool
 332 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 333         Bool baseismin;
 334         Monitor *m = c->mon;
 335
 336         /* set minimum possible */
 337         *w = MAX(1, *w);
 338         *h = MAX(1, *h);
 339         if(interact) {
 340                 if(*x > sw)
 341                         *x = sw - WIDTH(c);
 342                 if(*y > sh)
 343                         *y = sh - HEIGHT(c);
 344                 if(*x + *w + 2 * c->bw < 0)
 345                         *x = 0;
 346                 if(*y + *h + 2 * c->bw < 0)
 347                         *y = 0;
 348         }
 349         else {
 350                 if(*x >= m->wx + m->ww)
 351                         *x = m->wx + m->ww - WIDTH(c);
 352                 if(*y >= m->wy + m->wh)
 353                         *y = m->wy + m->wh - HEIGHT(c);
 354                 if(*x + *w + 2 * c->bw <= m->wx)
 355                         *x = m->wx;
 356                 if(*y + *h + 2 * c->bw <= m->wy)
 357                         *y = m->wy;
 358         }
 359         if(*h < bh)
 360                 *h = bh;
 361         if(*w < bh)
 362                 *w = bh;
 363         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 364                 /* see last two sentences in ICCCM 4.1.2.3 */
 365                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 366                 if(!baseismin) { /* temporarily remove base dimensions */
 367                         *w -= c->basew;
 368                         *h -= c->baseh;
 369                 }
 370                 /* adjust for aspect limits */
 371                 if(c->mina > 0 && c->maxa > 0) {
 372                         if(c->maxa < (float)*w / *h)
 373                                 *w = *h * c->maxa + 0.5;
 374                         else if(c->mina < (float)*h / *w)
 375                                 *h = *w * c->mina + 0.5;
 376                 }
 377                 if(baseismin) { /* increment calculation requires this */
 378                         *w -= c->basew;
 379                         *h -= c->baseh;
 380                 }
 381                 /* adjust for increment value */
 382                 if(c->incw)
 383                         *w -= *w % c->incw;
 384                 if(c->inch)
 385                         *h -= *h % c->inch;
 386                 /* restore base dimensions */
 387                 *w = MAX(*w + c->basew, c->minw);
 388                 *h = MAX(*h + c->baseh, c->minh);
 389                 if(c->maxw)
 390                         *w = MIN(*w, c->maxw);
 391                 if(c->maxh)
 392                         *h = MIN(*h, c->maxh);
 393         }
 394         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 395 }
 396
 397 void
 398 arrange(Monitor *m) {
 399         if(m)
 400                 showhide(m->stack);
 401         else for(m = mons; m; m = m->next)
 402                 showhide(m->stack);
 403         if(m) {
 404                 arrangemon(m);
 405                 restack(m);
 406         } else for(m = mons; m; m = m->next)
 407                 arrangemon(m);
 408 }
 409
 410 void
 411 arrangemon(Monitor *m) {
 412         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 413         if(m->lt[m->sellt]->arrange)
 414                 m->lt[m->sellt]->arrange(m);
 415 }
 416
 417 void
 418 attach(Client *c) {
 419         c->next = c->mon->clients;
 420         c->mon->clients = c;
 421 }
 422
 423 void
 424 attachstack(Client *c) {
 425         c->snext = c->mon->stack;
 426         c->mon->stack = c;
 427 }
 428
 429 void
 430 buttonpress(XEvent *e) {
 431         unsigned int i, x, click;
 432         Arg arg = {0};
 433         Client *c;
 434         Monitor *m;
 435         XButtonPressedEvent *ev = &e->xbutton;
 436
 437         click = ClkRootWin;
 438         /* focus monitor if necessary */
 439         if((m = wintomon(ev->window)) && m != selmon) {
 440                 unfocus(selmon->sel, True);
 441                 selmon = m;
 442                 focus(NULL);
 443         }
 444         if(ev->window == selmon->barwin) {
 445                 i = x = 0;
 446                 do
 447                         x += TEXTW(tags[i]);
 448                 while(ev->x >= x && ++i < LENGTH(tags));
 449                 if(i < LENGTH(tags)) {
 450                         click = ClkTagBar;
 451                         arg.ui = 1 << i;
 452                 }
 453                 else if(ev->x < x + blw)
 454                         click = ClkLtSymbol;
 455                 else if(ev->x > selmon->ww - TEXTW(stext))
 456                         click = ClkStatusText;
 457                 else
 458                         click = ClkWinTitle;
 459         }
 460         else if((c = wintoclient(ev->window))) {
 461                 focus(c);
 462                 click = ClkClientWin;
 463         }
 464         for(i = 0; i < LENGTH(buttons); i++)
 465                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 466                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 467                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 468 }
 469
 470 void
 471 checkotherwm(void) {
 472         xerrorxlib = XSetErrorHandler(xerrorstart);
 473         /* this causes an error if some other window manager is running */
 474         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 475         XSync(dpy, False);
 476         XSetErrorHandler(xerror);
 477         XSync(dpy, False);
 478 }
 479
 480 void
 481 cleanup(void) {
 482         Arg a = {.ui = ~0};
 483         Layout foo = { "", NULL };
 484         Monitor *m;
 485
 486         view(&a);
 487         selmon->lt[selmon->sellt] = &foo;
 488         for(m = mons; m; m = m->next)
 489                 while(m->stack)
 490                         unmanage(m->stack, False);
 491         if(dc.font.set)
 492                 XFreeFontSet(dpy, dc.font.set);
 493         else
 494                 XFreeFont(dpy, dc.font.xfont);
 495         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 496         XFreePixmap(dpy, dc.drawable);
 497         XFreeGC(dpy, dc.gc);
 498         XFreeCursor(dpy, cursor[CurNormal]);
 499         XFreeCursor(dpy, cursor[CurResize]);
 500         XFreeCursor(dpy, cursor[CurMove]);
 501         while(mons)
 502                 cleanupmon(mons);
 503         XSync(dpy, False);
 504         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 505         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 506 }
 507
 508 void
 509 cleanupmon(Monitor *mon) {
 510         Monitor *m;
 511
 512         if(mon == mons)
 513                 mons = mons->next;
 514         else {
 515                 for(m = mons; m && m->next != mon; m = m->next);
 516                 m->next = mon->next;
 517         }
 518         XUnmapWindow(dpy, mon->barwin);
 519         XDestroyWindow(dpy, mon->barwin);
 520         free(mon);
 521 }
 522
 523 void
 524 clearurgent(Client *c) {
 525         XWMHints *wmh;
 526
 527         c->isurgent = False;
 528         if(!(wmh = XGetWMHints(dpy, c->win)))
 529                 return;
 530         wmh->flags &= ~XUrgencyHint;
 531         XSetWMHints(dpy, c->win, wmh);
 532         XFree(wmh);
 533 }
 534
 535 void
 536 clientmessage(XEvent *e) {
 537         XClientMessageEvent *cme = &e->xclient;
 538         Client *c = wintoclient(cme->window);
 539
 540         if(!c)
 541                 return;
 542         if(cme->message_type == netatom[NetWMState]) {
 543                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 544                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 545                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 546         }
 547         else if(cme->message_type == netatom[NetActiveWindow]) {
 548                 if(!ISVISIBLE(c)) {
 549                         c->mon->seltags ^= 1;
 550                         c->mon->tagset[c->mon->seltags] = c->tags;
 551                 }
 552                 pop(c);
 553         }
 554 }
 555
 556 void
 557 configure(Client *c) {
 558         XConfigureEvent ce;
 559
 560         ce.type = ConfigureNotify;
 561         ce.display = dpy;
 562         ce.event = c->win;
 563         ce.window = c->win;
 564         ce.x = c->x;
 565         ce.y = c->y;
 566         ce.width = c->w;
 567         ce.height = c->h;
 568         ce.border_width = c->bw;
 569         ce.above = None;
 570         ce.override_redirect = False;
 571         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 572 }
 573
 574 void
 575 configurenotify(XEvent *e) {
 576         Monitor *m;
 577         XConfigureEvent *ev = &e->xconfigure;
 578         Bool dirty;
 579
 580         // TODO: updategeom handling sucks, needs to be simplified
 581         if(ev->window == root) {
 582                 dirty = (sw != ev->width || sh != ev->height);
 583                 sw = ev->width;
 584                 sh = ev->height;
 585                 if(updategeom() || dirty) {
 586                         if(dc.drawable != 0)
 587                                 XFreePixmap(dpy, dc.drawable);
 588                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 589                         updatebars();
 590                         for(m = mons; m; m = m->next)
 591                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 592                         focus(NULL);
 593                         arrange(NULL);
 594                 }
 595         }
 596 }
 597
 598 void
 599 configurerequest(XEvent *e) {
 600         Client *c;
 601         Monitor *m;
 602         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 603         XWindowChanges wc;
 604
 605         if((c = wintoclient(ev->window))) {
 606                 if(ev->value_mask & CWBorderWidth)
 607                         c->bw = ev->border_width;
 608                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 609                         m = c->mon;
 610                         if(ev->value_mask & CWX) {
 611                                 c->oldx = c->x;
 612                                 c->x = m->mx + ev->x;
 613                         }
 614                         if(ev->value_mask & CWY) {
 615                                 c->oldy = c->y;
 616                                 c->y = m->my + ev->y;
 617                         }
 618                         if(ev->value_mask & CWWidth) {
 619                                 c->oldw = c->w;
 620                                 c->w = ev->width;
 621                         }
 622                         if(ev->value_mask & CWHeight) {
 623                                 c->oldh = c->h;
 624                                 c->h = ev->height;
 625                         }
 626                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 627                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 628                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 629                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 630                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 631                                 configure(c);
 632                         if(ISVISIBLE(c))
 633                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 634                 }
 635                 else
 636                         configure(c);
 637         }
 638         else {
 639                 wc.x = ev->x;
 640                 wc.y = ev->y;
 641                 wc.width = ev->width;
 642                 wc.height = ev->height;
 643                 wc.border_width = ev->border_width;
 644                 wc.sibling = ev->above;
 645                 wc.stack_mode = ev->detail;
 646                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 647         }
 648         XSync(dpy, False);
 649 }
 650
 651 Monitor *
 652 createmon(void) {
 653         Monitor *m;
 654
 655         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 656                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 657         m->tagset[0] = m->tagset[1] = 1;
 658         m->mfact = mfact;
 659         m->nmaster = nmaster;
 660         m->showbar = showbar;
 661         m->topbar = topbar;
 662         m->lt[0] = &layouts[0];
 663         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 664         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 665         return m;
 666 }
 667
 668 void
 669 destroynotify(XEvent *e) {
 670         Client *c;
 671         XDestroyWindowEvent *ev = &e->xdestroywindow;
 672
 673         if((c = wintoclient(ev->window)))
 674                 unmanage(c, True);
 675 }
 676
 677 void
 678 detach(Client *c) {
 679         Client **tc;
 680
 681         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 682         *tc = c->next;
 683 }
 684
 685 void
 686 detachstack(Client *c) {
 687         Client **tc, *t;
 688
 689         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 690         *tc = c->snext;
 691
 692         if(c == c->mon->sel) {
 693                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 694                 c->mon->sel = t;
 695         }
 696 }
 697
 698 void
 699 die(const char *errstr, ...) {
 700         va_list ap;
 701
 702         va_start(ap, errstr);
 703         vfprintf(stderr, errstr, ap);
 704         va_end(ap);
 705         exit(EXIT_FAILURE);
 706 }
 707
 708 Monitor *
 709 dirtomon(int dir) {
 710         Monitor *m = NULL;
 711
 712         if(dir > 0) {
 713                 if(!(m = selmon->next))
 714                         m = mons;
 715         }
 716         else if(selmon == mons)
 717                 for(m = mons; m->next; m = m->next);
 718         else
 719                 for(m = mons; m->next != selmon; m = m->next);
 720         return m;
 721 }
 722
 723 void
 724 drawbar(Monitor *m) {
 725         int x;
 726         unsigned int i, occ = 0, urg = 0;
 727         unsigned long *col;
 728         Client *c;
 729
 730         for(c = m->clients; c; c = c->next) {
 731                 occ |= c->tags;
 732                 if(c->isurgent)
 733                         urg |= c->tags;
 734         }
 735         dc.x = 0;
 736         for(i = 0; i < LENGTH(tags); i++) {
 737                 dc.w = TEXTW(tags[i]);
 738                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 739                 drawtext(tags[i], col, urg & 1 << i);
 740                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 741                            occ & 1 << i, urg & 1 << i, col);
 742                 dc.x += dc.w;
 743         }
 744         dc.w = blw = TEXTW(m->ltsymbol);
 745         drawtext(m->ltsymbol, dc.norm, False);
 746         dc.x += dc.w;
 747         x = dc.x;
 748         if(m == selmon) { /* status is only drawn on selected monitor */
 749                 dc.w = TEXTW(stext);
 750                 dc.x = m->ww - dc.w;
 751                 if(dc.x < x) {
 752                         dc.x = x;
 753                         dc.w = m->ww - x;
 754                 }
 755                 drawtext(stext, dc.norm, False);
 756         }
 757         else
 758                 dc.x = m->ww;
 759         if((dc.w = dc.x - x) > bh) {
 760                 dc.x = x;
 761                 if(m->sel) {
 762                         col = m == selmon ? dc.sel : dc.norm;
 763                         drawtext(m->sel->name, col, False);
 764                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 765                 }
 766                 else
 767                         drawtext(NULL, dc.norm, False);
 768         }
 769         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 770         XSync(dpy, False);
 771 }
 772
 773 void
 774 drawbars(void) {
 775         Monitor *m;
 776
 777         for(m = mons; m; m = m->next)
 778                 drawbar(m);
 779 }
 780
 781 void
 782 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 783         int x;
 784
 785         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 786         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 787         if(filled)
 788                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 789         else if(empty)
 790                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 791 }
 792
 793 void
 794 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 795         char buf[256];
 796         int i, x, y, h, len, olen;
 797
 798         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 799         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 800         if(!text)
 801                 return;
 802         olen = strlen(text);
 803         h = dc.font.ascent + dc.font.descent;
 804         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 805         x = dc.x + (h / 2);
 806         /* shorten text if necessary */
 807         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 808         if(!len)
 809                 return;
 810         memcpy(buf, text, len);
 811         if(len < olen)
 812                 for(i = len; i && i > len - 3; buf[--i] = '.');
 813         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 814         if(dc.font.set)
 815                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 816         else
 817                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 818 }
 819
 820 void
 821 enternotify(XEvent *e) {
 822         Client *c;
 823         Monitor *m;
 824         XCrossingEvent *ev = &e->xcrossing;
 825
 826         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 827                 return;
 828         c = wintoclient(ev->window);
 829         m = c ? c->mon : wintomon(ev->window);
 830         if(m != selmon) {
 831                 unfocus(selmon->sel, True);
 832                 selmon = m;
 833         }
 834         else if(!c || c == selmon->sel)
 835                 return;
 836         focus(c);
 837 }
 838
 839 void
 840 expose(XEvent *e) {
 841         Monitor *m;
 842         XExposeEvent *ev = &e->xexpose;
 843
 844         if(ev->count == 0 && (m = wintomon(ev->window)))
 845                 drawbar(m);
 846 }
 847
 848 void
 849 focus(Client *c) {
 850         if(!c || !ISVISIBLE(c))
 851                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 852         /* was if(selmon->sel) */
 853         if(selmon->sel && selmon->sel != c)
 854                 unfocus(selmon->sel, False);
 855         if(c) {
 856                 if(c->mon != selmon)
 857                         selmon = c->mon;
 858                 if(c->isurgent)
 859                         clearurgent(c);
 860                 detachstack(c);
 861                 attachstack(c);
 862                 grabbuttons(c, True);
 863                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 864                 setfocus(c);
 865         }
 866         else {
 867                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 868                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 869         }
 870         selmon->sel = c;
 871         drawbars();
 872 }
 873
 874 void
 875 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 876         XFocusChangeEvent *ev = &e->xfocus;
 877
 878         if(selmon->sel && ev->window != selmon->sel->win)
 879                 setfocus(selmon->sel);
 880 }
 881
 882 void
 883 focusmon(const Arg *arg) {
 884         Monitor *m;
 885
 886         if(!mons->next)
 887                 return;
 888         if((m = dirtomon(arg->i)) == selmon)
 889                 return;
 890         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 891                                         in gedit and anjuta */
 892         selmon = m;
 893         focus(NULL);
 894 }
 895
 896 void
 897 focusstack(const Arg *arg) {
 898         Client *c = NULL, *i;
 899
 900         if(!selmon->sel)
 901                 return;
 902         if(arg->i > 0) {
 903                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 904                 if(!c)
 905                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 906         }
 907         else {
 908                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 909                         if(ISVISIBLE(i))
 910                                 c = i;
 911                 if(!c)
 912                         for(; i; i = i->next)
 913                                 if(ISVISIBLE(i))
 914                                         c = i;
 915         }
 916         if(c) {
 917                 focus(c);
 918                 restack(selmon);
 919         }
 920 }
 921
 922 Atom
 923 getatomprop(Client *c, Atom prop) {
 924         int di;
 925         unsigned long dl;
 926         unsigned char *p = NULL;
 927         Atom da, atom = None;
 928
 929         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 930                               &da, &di, &dl, &dl, &p) == Success && p) {
 931                 atom = *(Atom *)p;
 932                 XFree(p);
 933         }
 934         return atom;
 935 }
 936
 937 unsigned long
 938 getcolor(const char *colstr) {
 939         Colormap cmap = DefaultColormap(dpy, screen);
 940         XColor color;
 941
 942         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 943                 die("error, cannot allocate color '%s'\n", colstr);
 944         return color.pixel;
 945 }
 946
 947 Bool
 948 getrootptr(int *x, int *y) {
 949         int di;
 950         unsigned int dui;
 951         Window dummy;
 952
 953         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 954 }
 955
 956 long
 957 getstate(Window w) {
 958         int format;
 959         long result = -1;
 960         unsigned char *p = NULL;
 961         unsigned long n, extra;
 962         Atom real;
 963
 964         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 965                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 966                 return -1;
 967         if(n != 0)
 968                 result = *p;
 969         XFree(p);
 970         return result;
 971 }
 972
 973 Bool
 974 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 975         char **list = NULL;
 976         int n;
 977         XTextProperty name;
 978
 979         if(!text || size == 0)
 980                 return False;
 981         text[0] = '\0';
 982         XGetTextProperty(dpy, w, &name, atom);
 983         if(!name.nitems)
 984                 return False;
 985         if(name.encoding == XA_STRING)
 986                 strncpy(text, (char *)name.value, size - 1);
 987         else {
 988                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 989                         strncpy(text, *list, size - 1);
 990                         XFreeStringList(list);
 991                 }
 992         }
 993         text[size - 1] = '\0';
 994         XFree(name.value);
 995         return True;
 996 }
 997
 998 void
 999 grabbuttons(Client *c, Bool focused) {
1000         updatenumlockmask();
1001         {
1002                 unsigned int i, j;
1003                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1004                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1005                 if(focused) {
1006                         for(i = 0; i < LENGTH(buttons); i++)
1007                                 if(buttons[i].click == ClkClientWin)
1008                                         for(j = 0; j < LENGTH(modifiers); j++)
1009                                                 XGrabButton(dpy, buttons[i].button,
1010                                                             buttons[i].mask | modifiers[j],
1011                                                             c->win, False, BUTTONMASK,
1012                                                             GrabModeAsync, GrabModeSync, None, None);
1013                 }
1014                 else
1015                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1016                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1017         }
1018 }
1019
1020 void
1021 grabkeys(void) {
1022         updatenumlockmask();
1023         {
1024                 unsigned int i, j;
1025                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1026                 KeyCode code;
1027
1028                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1029                 for(i = 0; i < LENGTH(keys); i++)
1030                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1031                                 for(j = 0; j < LENGTH(modifiers); j++)
1032                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1033                                                  True, GrabModeAsync, GrabModeAsync);
1034         }
1035 }
1036
1037 void
1038 incnmaster(const Arg *arg) {
1039         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1040         arrange(selmon);
1041 }
1042
1043 void
1044 initfont(const char *fontstr) {
1045         char *def, **missing;
1046         int n;
1047
1048         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1049         if(missing) {
1050                 while(n--)
1051                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1052                 XFreeStringList(missing);
1053         }
1054         if(dc.font.set) {
1055                 XFontStruct **xfonts;
1056                 char **font_names;
1057
1058                 dc.font.ascent = dc.font.descent = 0;
1059                 XExtentsOfFontSet(dc.font.set);
1060                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1061                 while(n--) {
1062                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1063                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1064                         xfonts++;
1065                 }
1066         }
1067         else {
1068                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1069                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1070                         die("error, cannot load font: '%s'\n", fontstr);
1071                 dc.font.ascent = dc.font.xfont->ascent;
1072                 dc.font.descent = dc.font.xfont->descent;
1073         }
1074         dc.font.height = dc.font.ascent + dc.font.descent;
1075 }
1076
1077 #ifdef XINERAMA
1078 static Bool
1079 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1080         while(n--)
1081                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1082                 && unique[n].width == info->width && unique[n].height == info->height)
1083                         return False;
1084         return True;
1085 }
1086 #endif /* XINERAMA */
1087
1088 void
1089 keypress(XEvent *e) {
1090         unsigned int i;
1091         KeySym keysym;
1092         XKeyEvent *ev;
1093
1094         ev = &e->xkey;
1095         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1096         for(i = 0; i < LENGTH(keys); i++)
1097                 if(keysym == keys[i].keysym
1098                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1099                 && keys[i].func)
1100                         keys[i].func(&(keys[i].arg));
1101 }
1102
1103 void
1104 killclient(const Arg *arg) {
1105         if(!selmon->sel)
1106                 return;
1107         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1108                 XGrabServer(dpy);
1109                 XSetErrorHandler(xerrordummy);
1110                 XSetCloseDownMode(dpy, DestroyAll);
1111                 XKillClient(dpy, selmon->sel->win);
1112                 XSync(dpy, False);
1113                 XSetErrorHandler(xerror);
1114                 XUngrabServer(dpy);
1115         }
1116 }
1117
1118 void
1119 manage(Window w, XWindowAttributes *wa) {
1120         Client *c, *t = NULL;
1121         Window trans = None;
1122         XWindowChanges wc;
1123
1124         if(!(c = calloc(1, sizeof(Client))))
1125                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1126         c->win = w;
1127         updatetitle(c);
1128         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1129                 c->mon = t->mon;
1130                 c->tags = t->tags;
1131         }
1132         else {
1133                 c->mon = selmon;
1134                 applyrules(c);
1135         }
1136         /* geometry */
1137         c->x = c->oldx = wa->x;
1138         c->y = c->oldy = wa->y;
1139         c->w = c->oldw = wa->width;
1140         c->h = c->oldh = wa->height;
1141         c->oldbw = wa->border_width;
1142
1143         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1144                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1145         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1146                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1147         c->x = MAX(c->x, c->mon->mx);
1148         /* only fix client y-offset, if the client center might cover the bar */
1149         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1150                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1151         c->bw = borderpx;
1152
1153         wc.border_width = c->bw;
1154         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1155         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1156         configure(c); /* propagates border_width, if size doesn't change */
1157         updatewindowtype(c);
1158         updatesizehints(c);
1159         updatewmhints(c);
1160         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1161         grabbuttons(c, False);
1162         if(!c->isfloating)
1163                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1164         if(c->isfloating)
1165                 XRaiseWindow(dpy, c->win);
1166         attach(c);
1167         attachstack(c);
1168         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1169                         (unsigned char *) &(c->win), 1);
1170         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1171         setclientstate(c, NormalState);
1172         if (c->mon == selmon)
1173                 unfocus(selmon->sel, False);
1174         c->mon->sel = c;
1175         arrange(c->mon);
1176         XMapWindow(dpy, c->win);
1177         focus(NULL);
1178 }
1179
1180 void
1181 mappingnotify(XEvent *e) {
1182         XMappingEvent *ev = &e->xmapping;
1183
1184         XRefreshKeyboardMapping(ev);
1185         if(ev->request == MappingKeyboard)
1186                 grabkeys();
1187 }
1188
1189 void
1190 maprequest(XEvent *e) {
1191         static XWindowAttributes wa;
1192         XMapRequestEvent *ev = &e->xmaprequest;
1193
1194         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1195                 return;
1196         if(wa.override_redirect)
1197                 return;
1198         if(!wintoclient(ev->window))
1199                 manage(ev->window, &wa);
1200 }
1201
1202 void
1203 monocle(Monitor *m) {
1204         unsigned int n = 0;
1205         Client *c;
1206
1207         for(c = m->clients; c; c = c->next)
1208                 if(ISVISIBLE(c))
1209                         n++;
1210         if(n > 0) /* override layout symbol */
1211                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1212         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1213                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1214 }
1215
1216 void
1217 motionnotify(XEvent *e) {
1218         static Monitor *mon = NULL;
1219         Monitor *m;
1220         XMotionEvent *ev = &e->xmotion;
1221
1222         if(ev->window != root)
1223                 return;
1224         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1225                 unfocus(selmon->sel, True);
1226                 selmon = m;
1227                 focus(NULL);
1228         }
1229         mon = m;
1230 }
1231
1232 void
1233 movemouse(const Arg *arg) {
1234         int x, y, ocx, ocy, nx, ny;
1235         Client *c;
1236         Monitor *m;
1237         XEvent ev;
1238
1239         if(!(c = selmon->sel))
1240                 return;
1241         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1242                 return;
1243         restack(selmon);
1244         ocx = c->x;
1245         ocy = c->y;
1246         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1247         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1248                 return;
1249         if(!getrootptr(&x, &y))
1250                 return;
1251         do {
1252                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1253                 switch(ev.type) {
1254                 case ConfigureRequest:
1255                 case Expose:
1256                 case MapRequest:
1257                         handler[ev.type](&ev);
1258                         break;
1259                 case MotionNotify:
1260                         nx = ocx + (ev.xmotion.x - x);
1261                         ny = ocy + (ev.xmotion.y - y);
1262                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1263                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1264                                 if(abs(selmon->wx - nx) < snap)
1265                                         nx = selmon->wx;
1266                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1267                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1268                                 if(abs(selmon->wy - ny) < snap)
1269                                         ny = selmon->wy;
1270                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1271                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1272                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1273                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1274                                         togglefloating(NULL);
1275                         }
1276                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1277                                 resize(c, nx, ny, c->w, c->h, True);
1278                         break;
1279                 }
1280         } while(ev.type != ButtonRelease);
1281         XUngrabPointer(dpy, CurrentTime);
1282         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1283                 sendmon(c, m);
1284                 selmon = m;
1285                 focus(NULL);
1286         }
1287 }
1288
1289 Client *
1290 nexttiled(Client *c) {
1291         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1292         return c;
1293 }
1294
1295 void
1296 pop(Client *c) {
1297         detach(c);
1298         attach(c);
1299         focus(c);
1300         arrange(c->mon);
1301 }
1302
1303 void
1304 propertynotify(XEvent *e) {
1305         Client *c;
1306         Window trans;
1307         XPropertyEvent *ev = &e->xproperty;
1308
1309         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1310                 updatestatus();
1311         else if(ev->state == PropertyDelete)
1312                 return; /* ignore */
1313         else if((c = wintoclient(ev->window))) {
1314                 switch(ev->atom) {
1315                 default: break;
1316                 case XA_WM_TRANSIENT_FOR:
1317                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1318                            (c->isfloating = (wintoclient(trans)) != NULL))
1319                                 arrange(c->mon);
1320                         break;
1321                 case XA_WM_NORMAL_HINTS:
1322                         updatesizehints(c);
1323                         break;
1324                 case XA_WM_HINTS:
1325                         updatewmhints(c);
1326                         drawbars();
1327                         break;
1328                 }
1329                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1330                         updatetitle(c);
1331                         if(c == c->mon->sel)
1332                                 drawbar(c->mon);
1333                 }
1334                 if(ev->atom == netatom[NetWMWindowType])
1335                         updatewindowtype(c);
1336         }
1337 }
1338
1339 void
1340 quit(const Arg *arg) {
1341         running = False;
1342 }
1343
1344 Monitor *
1345 recttomon(int x, int y, int w, int h) {
1346         Monitor *m, *r = selmon;
1347         int a, area = 0;
1348
1349         for(m = mons; m; m = m->next)
1350                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1351                         area = a;
1352                         r = m;
1353                 }
1354         return r;
1355 }
1356
1357 void
1358 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1359         if(applysizehints(c, &x, &y, &w, &h, interact))
1360                 resizeclient(c, x, y, w, h);
1361 }
1362
1363 void
1364 resizeclient(Client *c, int x, int y, int w, int h) {
1365         XWindowChanges wc;
1366
1367         c->oldx = c->x; c->x = wc.x = x;
1368         c->oldy = c->y; c->y = wc.y = y;
1369         c->oldw = c->w; c->w = wc.width = w;
1370         c->oldh = c->h; c->h = wc.height = h;
1371         wc.border_width = c->bw;
1372         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1373         configure(c);
1374         XSync(dpy, False);
1375 }
1376
1377 void
1378 resizemouse(const Arg *arg) {
1379         int ocx, ocy;
1380         int nw, nh;
1381         Client *c;
1382         Monitor *m;
1383         XEvent ev;
1384
1385         if(!(c = selmon->sel))
1386                 return;
1387         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1388                 return;
1389         restack(selmon);
1390         ocx = c->x;
1391         ocy = c->y;
1392         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1393                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1394                 return;
1395         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1396         do {
1397                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1398                 switch(ev.type) {
1399                 case ConfigureRequest:
1400                 case Expose:
1401                 case MapRequest:
1402                         handler[ev.type](&ev);
1403                         break;
1404                 case MotionNotify:
1405                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1406                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1407                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1408                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1409                         {
1410                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1411                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1412                                         togglefloating(NULL);
1413                         }
1414                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1415                                 resize(c, c->x, c->y, nw, nh, True);
1416                         break;
1417                 }
1418         } while(ev.type != ButtonRelease);
1419         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1420         XUngrabPointer(dpy, CurrentTime);
1421         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1422         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1423                 sendmon(c, m);
1424                 selmon = m;
1425                 focus(NULL);
1426         }
1427 }
1428
1429 void
1430 restack(Monitor *m) {
1431         Client *c;
1432         XEvent ev;
1433         XWindowChanges wc;
1434
1435         drawbar(m);
1436         if(!m->sel)
1437                 return;
1438         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1439                 XRaiseWindow(dpy, m->sel->win);
1440         if(m->lt[m->sellt]->arrange) {
1441                 wc.stack_mode = Below;
1442                 wc.sibling = m->barwin;
1443                 for(c = m->stack; c; c = c->snext)
1444                         if(!c->isfloating && ISVISIBLE(c)) {
1445                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1446                                 wc.sibling = c->win;
1447                         }
1448         }
1449         XSync(dpy, False);
1450         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1451 }
1452
1453 void
1454 run(void) {
1455         XEvent ev;
1456         /* main event loop */
1457         XSync(dpy, False);
1458         while(running && !XNextEvent(dpy, &ev))
1459                 if(handler[ev.type])
1460                         handler[ev.type](&ev); /* call handler */
1461 }
1462
1463 void
1464 scan(void) {
1465         unsigned int i, num;
1466         Window d1, d2, *wins = NULL;
1467         XWindowAttributes wa;
1468
1469         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1470                 for(i = 0; i < num; i++) {
1471                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1472                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1473                                 continue;
1474                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1475                                 manage(wins[i], &wa);
1476                 }
1477                 for(i = 0; i < num; i++) { /* now the transients */
1478                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1479                                 continue;
1480                         if(XGetTransientForHint(dpy, wins[i], &d1)
1481                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1482                                 manage(wins[i], &wa);
1483                 }
1484                 if(wins)
1485                         XFree(wins);
1486         }
1487 }
1488
1489 void
1490 sendmon(Client *c, Monitor *m) {
1491         if(c->mon == m)
1492                 return;
1493         unfocus(c, True);
1494         detach(c);
1495         detachstack(c);
1496         c->mon = m;
1497         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1498         attach(c);
1499         attachstack(c);
1500         focus(NULL);
1501         arrange(NULL);
1502 }
1503
1504 void
1505 setclientstate(Client *c, long state) {
1506         long data[] = { state, None };
1507
1508         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1509                         PropModeReplace, (unsigned char *)data, 2);
1510 }
1511
1512 Bool
1513 sendevent(Client *c, Atom proto) {
1514         int n;
1515         Atom *protocols;
1516         Bool exists = False;
1517         XEvent ev;
1518
1519         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1520                 while(!exists && n--)
1521                         exists = protocols[n] == proto;
1522                 XFree(protocols);
1523         }
1524         if(exists) {
1525                 ev.type = ClientMessage;
1526                 ev.xclient.window = c->win;
1527                 ev.xclient.message_type = wmatom[WMProtocols];
1528                 ev.xclient.format = 32;
1529                 ev.xclient.data.l[0] = proto;
1530                 ev.xclient.data.l[1] = CurrentTime;
1531                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1532         }
1533         return exists;
1534 }
1535
1536 void
1537 setfocus(Client *c) {
1538         if(!c->neverfocus) {
1539                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1540                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1541                                 XA_WINDOW, 32, PropModeReplace,
1542                                 (unsigned char *) &(c->win), 1);
1543         }
1544         sendevent(c, wmatom[WMTakeFocus]);
1545 }
1546
1547 void
1548 setfullscreen(Client *c, Bool fullscreen) {
1549         if(fullscreen) {
1550                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1551                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1552                 c->isfullscreen = True;
1553                 c->oldstate = c->isfloating;
1554                 c->oldbw = c->bw;
1555                 c->bw = 0;
1556                 c->isfloating = True;
1557                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1558                 XRaiseWindow(dpy, c->win);
1559         }
1560         else {
1561                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1562                                 PropModeReplace, (unsigned char*)0, 0);
1563                 c->isfullscreen = False;
1564                 c->isfloating = c->oldstate;
1565                 c->bw = c->oldbw;
1566                 c->x = c->oldx;
1567                 c->y = c->oldy;
1568                 c->w = c->oldw;
1569                 c->h = c->oldh;
1570                 resizeclient(c, c->x, c->y, c->w, c->h);
1571                 arrange(c->mon);
1572         }
1573 }
1574
1575 void
1576 setlayout(const Arg *arg) {
1577         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1578                 selmon->sellt ^= 1;
1579         if(arg && arg->v)
1580                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1581         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1582         if(selmon->sel)
1583                 arrange(selmon);
1584         else
1585                 drawbar(selmon);
1586 }
1587
1588 /* arg > 1.0 will set mfact absolutly */
1589 void
1590 setmfact(const Arg *arg) {
1591         float f;
1592
1593         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1594                 return;
1595         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1596         if(f < 0.1 || f > 0.9)
1597                 return;
1598         selmon->mfact = f;
1599         arrange(selmon);
1600 }
1601
1602 void
1603 setup(void) {
1604         XSetWindowAttributes wa;
1605
1606         /* clean up any zombies immediately */
1607         sigchld(0);
1608
1609         /* init screen */
1610         screen = DefaultScreen(dpy);
1611         root = RootWindow(dpy, screen);
1612         initfont(font);
1613         sw = DisplayWidth(dpy, screen);
1614         sh = DisplayHeight(dpy, screen);
1615         bh = dc.h = dc.font.height + 2;
1616         updategeom();
1617         /* init atoms */
1618         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1619         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1620         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1621         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1622         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1623         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1624         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1625         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1626         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1627         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1628         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1629         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1630         /* init cursors */
1631         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1632         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1633         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1634         /* init appearance */
1635         dc.norm[ColBorder] = getcolor(normbordercolor);
1636         dc.norm[ColBG] = getcolor(normbgcolor);
1637         dc.norm[ColFG] = getcolor(normfgcolor);
1638         dc.sel[ColBorder] = getcolor(selbordercolor);
1639         dc.sel[ColBG] = getcolor(selbgcolor);
1640         dc.sel[ColFG] = getcolor(selfgcolor);
1641         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1642         dc.gc = XCreateGC(dpy, root, 0, NULL);
1643         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1644         if(!dc.font.set)
1645                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1646         /* init bars */
1647         updatebars();
1648         updatestatus();
1649         /* EWMH support per view */
1650         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1651                         PropModeReplace, (unsigned char *) netatom, NetLast);
1652         XDeleteProperty(dpy, root, netatom[NetClientList]);
1653         /* select for events */
1654         wa.cursor = cursor[CurNormal];
1655         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1656                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1657         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1658         XSelectInput(dpy, root, wa.event_mask);
1659         grabkeys();
1660 }
1661
1662 void
1663 showhide(Client *c) {
1664         if(!c)
1665                 return;
1666         if(ISVISIBLE(c)) { /* show clients top down */
1667                 XMoveWindow(dpy, c->win, c->x, c->y);
1668                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1669                         resize(c, c->x, c->y, c->w, c->h, False);
1670                 showhide(c->snext);
1671         }
1672         else { /* hide clients bottom up */
1673                 showhide(c->snext);
1674                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1675         }
1676 }
1677
1678 void
1679 sigchld(int unused) {
1680         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1681                 die("Can't install SIGCHLD handler");
1682         while(0 < waitpid(-1, NULL, WNOHANG));
1683 }
1684
1685 void
1686 spawn(const Arg *arg) {
1687         if(fork() == 0) {
1688                 if(dpy)
1689                         close(ConnectionNumber(dpy));
1690                 setsid();
1691                 execvp(((char **)arg->v)[0], (char **)arg->v);
1692                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1693                 perror(" failed");
1694                 exit(EXIT_SUCCESS);
1695         }
1696 }
1697
1698 void
1699 tag(const Arg *arg) {
1700         if(selmon->sel && arg->ui & TAGMASK) {
1701                 selmon->sel->tags = arg->ui & TAGMASK;
1702                 focus(NULL);
1703                 arrange(selmon);
1704         }
1705 }
1706
1707 void
1708 tagmon(const Arg *arg) {
1709         if(!selmon->sel || !mons->next)
1710                 return;
1711         sendmon(selmon->sel, dirtomon(arg->i));
1712 }
1713
1714 int
1715 textnw(const char *text, unsigned int len) {
1716         XRectangle r;
1717
1718         if(dc.font.set) {
1719                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1720                 return r.width;
1721         }
1722         return XTextWidth(dc.font.xfont, text, len);
1723 }
1724
1725 void
1726 tile(Monitor *m) {
1727         unsigned int i, n, h, mw, my, ty;
1728         Client *c;
1729
1730         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1731         if(n == 0)
1732                 return;
1733
1734         if(n > m->nmaster)
1735                 mw = m->nmaster ? m->ww * m->mfact : 0;
1736         else
1737                 mw = m->ww;
1738         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1739                 if(i < m->nmaster) {
1740                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1741                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1742                         my += HEIGHT(c);
1743                 }
1744                 else {
1745                         h = (m->wh - ty) / (n - i);
1746                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1747                         ty += HEIGHT(c);
1748                 }
1749 }
1750
1751 void
1752 togglebar(const Arg *arg) {
1753         selmon->showbar = !selmon->showbar;
1754         updatebarpos(selmon);
1755         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1756         arrange(selmon);
1757 }
1758
1759 void
1760 togglefloating(const Arg *arg) {
1761         if(!selmon->sel)
1762                 return;
1763         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1764                 return;
1765         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1766         if(selmon->sel->isfloating)
1767                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1768                        selmon->sel->w, selmon->sel->h, False);
1769         arrange(selmon);
1770 }
1771
1772 void
1773 toggletag(const Arg *arg) {
1774         unsigned int newtags;
1775
1776         if(!selmon->sel)
1777                 return;
1778         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1779         if(newtags) {
1780                 selmon->sel->tags = newtags;
1781                 focus(NULL);
1782                 arrange(selmon);
1783         }
1784 }
1785
1786 void
1787 toggleview(const Arg *arg) {
1788         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1789
1790         if(newtagset) {
1791                 selmon->tagset[selmon->seltags] = newtagset;
1792                 focus(NULL);
1793                 arrange(selmon);
1794         }
1795 }
1796
1797 void
1798 unfocus(Client *c, Bool setfocus) {
1799         if(!c)
1800                 return;
1801         grabbuttons(c, False);
1802         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1803         if(setfocus) {
1804                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1805                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1806         }
1807 }
1808
1809 void
1810 unmanage(Client *c, Bool destroyed) {
1811         Monitor *m = c->mon;
1812         XWindowChanges wc;
1813
1814         /* The server grab construct avoids race conditions. */
1815         detach(c);
1816         detachstack(c);
1817         if(!destroyed) {
1818                 wc.border_width = c->oldbw;
1819                 XGrabServer(dpy);
1820                 XSetErrorHandler(xerrordummy);
1821                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1822                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1823                 setclientstate(c, WithdrawnState);
1824                 XSync(dpy, False);
1825                 XSetErrorHandler(xerror);
1826                 XUngrabServer(dpy);
1827         }
1828         free(c);
1829         focus(NULL);
1830         updateclientlist();
1831         arrange(m);
1832 }
1833
1834 void
1835 unmapnotify(XEvent *e) {
1836         Client *c;
1837         XUnmapEvent *ev = &e->xunmap;
1838
1839         if((c = wintoclient(ev->window))) {
1840                 if(ev->send_event)
1841                         setclientstate(c, WithdrawnState);
1842                 else
1843                         unmanage(c, False);
1844         }
1845 }
1846
1847 void
1848 updatebars(void) {
1849         Monitor *m;
1850         XSetWindowAttributes wa = {
1851                 .override_redirect = True,
1852                 .background_pixmap = ParentRelative,
1853                 .event_mask = ButtonPressMask|ExposureMask
1854         };
1855         for(m = mons; m; m = m->next) {
1856                 if (m->barwin)
1857                         continue;
1858                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1859                                           CopyFromParent, DefaultVisual(dpy, screen),
1860                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1861                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1862                 XMapRaised(dpy, m->barwin);
1863         }
1864 }
1865
1866 void
1867 updatebarpos(Monitor *m) {
1868         m->wy = m->my;
1869         m->wh = m->mh;
1870         if(m->showbar) {
1871                 m->wh -= bh;
1872                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1873                 m->wy = m->topbar ? m->wy + bh : m->wy;
1874         }
1875         else
1876                 m->by = -bh;
1877 }
1878
1879 void
1880 updateclientlist() {
1881         Client *c;
1882         Monitor *m;
1883
1884         XDeleteProperty(dpy, root, netatom[NetClientList]);
1885         for(m = mons; m; m = m->next)
1886                 for(c = m->clients; c; c = c->next)
1887                         XChangeProperty(dpy, root, netatom[NetClientList],
1888                                         XA_WINDOW, 32, PropModeAppend,
1889                                         (unsigned char *) &(c->win), 1);
1890 }
1891
1892 Bool
1893 updategeom(void) {
1894         Bool dirty = False;
1895
1896 #ifdef XINERAMA
1897         if(XineramaIsActive(dpy)) {
1898                 int i, j, n, nn;
1899                 Client *c;
1900                 Monitor *m;
1901                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1902                 XineramaScreenInfo *unique = NULL;
1903
1904                 for(n = 0, m = mons; m; m = m->next, n++);
1905                 /* only consider unique geometries as separate screens */
1906                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1907                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1908                 for(i = 0, j = 0; i < nn; i++)
1909                         if(isuniquegeom(unique, j, &info[i]))
1910                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1911                 XFree(info);
1912                 nn = j;
1913                 if(n <= nn) {
1914                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1915                                 for(m = mons; m && m->next; m = m->next);
1916                                 if(m)
1917                                         m->next = createmon();
1918                                 else
1919                                         mons = createmon();
1920                         }
1921                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1922                                 if(i >= n
1923                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1924                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1925                                 {
1926                                         dirty = True;
1927                                         m->num = i;
1928                                         m->mx = m->wx = unique[i].x_org;
1929                                         m->my = m->wy = unique[i].y_org;
1930                                         m->mw = m->ww = unique[i].width;
1931                                         m->mh = m->wh = unique[i].height;
1932                                         updatebarpos(m);
1933                                 }
1934                 }
1935                 else { /* less monitors available nn < n */
1936                         for(i = nn; i < n; i++) {
1937                                 for(m = mons; m && m->next; m = m->next);
1938                                 while(m->clients) {
1939                                         dirty = True;
1940                                         c = m->clients;
1941                                         m->clients = c->next;
1942                                         detachstack(c);
1943                                         c->mon = mons;
1944                                         attach(c);
1945                                         attachstack(c);
1946                                 }
1947                                 if(m == selmon)
1948                                         selmon = mons;
1949                                 cleanupmon(m);
1950                         }
1951                 }
1952                 free(unique);
1953         }
1954         else
1955 #endif /* XINERAMA */
1956         /* default monitor setup */
1957         {
1958                 if(!mons)
1959                         mons = createmon();
1960                 if(mons->mw != sw || mons->mh != sh) {
1961                         dirty = True;
1962                         mons->mw = mons->ww = sw;
1963                         mons->mh = mons->wh = sh;
1964                         updatebarpos(mons);
1965                 }
1966         }
1967         if(dirty) {
1968                 selmon = mons;
1969                 selmon = wintomon(root);
1970         }
1971         return dirty;
1972 }
1973
1974 void
1975 updatenumlockmask(void) {
1976         unsigned int i, j;
1977         XModifierKeymap *modmap;
1978
1979         numlockmask = 0;
1980         modmap = XGetModifierMapping(dpy);
1981         for(i = 0; i < 8; i++)
1982                 for(j = 0; j < modmap->max_keypermod; j++)
1983                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1984                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1985                                 numlockmask = (1 << i);
1986         XFreeModifiermap(modmap);
1987 }
1988
1989 void
1990 updatesizehints(Client *c) {
1991         long msize;
1992         XSizeHints size;
1993
1994         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1995                 /* size is uninitialized, ensure that size.flags aren't used */
1996                 size.flags = PSize;
1997         if(size.flags & PBaseSize) {
1998                 c->basew = size.base_width;
1999                 c->baseh = size.base_height;
2000         }
2001         else if(size.flags & PMinSize) {
2002                 c->basew = size.min_width;
2003                 c->baseh = size.min_height;
2004         }
2005         else
2006                 c->basew = c->baseh = 0;
2007         if(size.flags & PResizeInc) {
2008                 c->incw = size.width_inc;
2009                 c->inch = size.height_inc;
2010         }
2011         else
2012                 c->incw = c->inch = 0;
2013         if(size.flags & PMaxSize) {
2014                 c->maxw = size.max_width;
2015                 c->maxh = size.max_height;
2016         }
2017         else
2018                 c->maxw = c->maxh = 0;
2019         if(size.flags & PMinSize) {
2020                 c->minw = size.min_width;
2021                 c->minh = size.min_height;
2022         }
2023         else if(size.flags & PBaseSize) {
2024                 c->minw = size.base_width;
2025                 c->minh = size.base_height;
2026         }
2027         else
2028                 c->minw = c->minh = 0;
2029         if(size.flags & PAspect) {
2030                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2031                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2032         }
2033         else
2034                 c->maxa = c->mina = 0.0;
2035         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2036                      && c->maxw == c->minw && c->maxh == c->minh);
2037 }
2038
2039 void
2040 updatetitle(Client *c) {
2041         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2042                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2043         if(c->name[0] == '\0') /* hack to mark broken clients */
2044                 strcpy(c->name, broken);
2045 }
2046
2047 void
2048 updatestatus(void) {
2049         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2050                 strcpy(stext, "dwm-"VERSION);
2051         drawbar(selmon);
2052 }
2053
2054 void
2055 updatewindowtype(Client *c) {
2056         Atom state = getatomprop(c, netatom[NetWMState]);
2057         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2058
2059         if(state == netatom[NetWMFullscreen])
2060                 setfullscreen(c, True);
2061         if(wtype == netatom[NetWMWindowTypeDialog])
2062                 c->isfloating = True;
2063 }
2064
2065 void
2066 updatewmhints(Client *c) {
2067         XWMHints *wmh;
2068
2069         if((wmh = XGetWMHints(dpy, c->win))) {
2070                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2071                         wmh->flags &= ~XUrgencyHint;
2072                         XSetWMHints(dpy, c->win, wmh);
2073                 }
2074                 else
2075                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2076                 if(wmh->flags & InputHint)
2077                         c->neverfocus = !wmh->input;
2078                 else
2079                         c->neverfocus = False;
2080                 XFree(wmh);
2081         }
2082 }
2083
2084 void
2085 view(const Arg *arg) {
2086         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2087                 return;
2088         selmon->seltags ^= 1; /* toggle sel tagset */
2089         if(arg->ui & TAGMASK)
2090                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2091         focus(NULL);
2092         arrange(selmon);
2093 }
2094
2095 Client *
2096 wintoclient(Window w) {
2097         Client *c;
2098         Monitor *m;
2099
2100         for(m = mons; m; m = m->next)
2101                 for(c = m->clients; c; c = c->next)
2102                         if(c->win == w)
2103                                 return c;
2104         return NULL;
2105 }
2106
2107 Monitor *
2108 wintomon(Window w) {
2109         int x, y;
2110         Client *c;
2111         Monitor *m;
2112
2113         if(w == root && getrootptr(&x, &y))
2114                 return recttomon(x, y, 1, 1);
2115         for(m = mons; m; m = m->next)
2116                 if(w == m->barwin)
2117                         return m;
2118         if((c = wintoclient(w)))
2119                 return c->mon;
2120         return selmon;
2121 }
2122
2123 /* There's no way to check accesses to destroyed windows, thus those cases are
2124  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2125  * default error handler, which may call exit.  */
2126 int
2127 xerror(Display *dpy, XErrorEvent *ee) {
2128         if(ee->error_code == BadWindow
2129         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2130         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2131         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2132         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2133         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2134         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2135         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2136         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2137                 return 0;
2138         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2139                         ee->request_code, ee->error_code);
2140         return xerrorxlib(dpy, ee); /* may call exit */
2141 }
2142
2143 int
2144 xerrordummy(Display *dpy, XErrorEvent *ee) {
2145         return 0;
2146 }
2147
2148 /* Startup Error handler to check if another window manager
2149  * is already running. */
2150 int
2151 xerrorstart(Display *dpy, XErrorEvent *ee) {
2152         die("dwm: another window manager is already running\n");
2153         return -1;
2154 }
2155
2156 void
2157 zoom(const Arg *arg) {
2158         Client *c = selmon->sel;
2159
2160         if(!selmon->lt[selmon->sellt]->arrange
2161         || (selmon->sel && selmon->sel->isfloating))
2162                 return;
2163         if(c == nexttiled(selmon->clients))
2164                 if(!c || !(c = nexttiled(c->next)))
2165                         return;
2166         pop(c);
2167 }
2168
2169 int
2170 main(int argc, char *argv[]) {
2171         if(argc == 2 && !strcmp("-v", argv[1]))
2172                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2173         else if(argc != 1)
2174                 die("usage: dwm [-v]\n");
2175         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2176                 fputs("warning: no locale support\n", stderr);
2177         if(!(dpy = XOpenDisplay(NULL)))
2178                 die("dwm: cannot open display\n");
2179         checkotherwm();
2180         setup();
2181         scan();
2182         run();
2183         cleanup();
2184         XCloseDisplay(dpy);
2185         return EXIT_SUCCESS;
2186 }