dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49 #define LENGTH(X)               (sizeof X / sizeof X[0])
  50 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58 /* enums */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetWMState,
  62        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63        NetWMWindowTypeDialog, NetLast };     /* EWMH atoms */
  64 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68 typedef union {
  69         int i;
  70         unsigned int ui;
  71         float f;
  72         const void *v;
  73 } Arg;
  74
  75 typedef struct {
  76         unsigned int click;
  77         unsigned int mask;
  78         unsigned int button;
  79         void (*func)(const Arg *arg);
  80         const Arg arg;
  81 } Button;
  82
  83 typedef struct Monitor Monitor;
  84 typedef struct Client Client;
  85 struct Client {
  86         char name[256];
  87         float mina, maxa;
  88         int x, y, w, h;
  89         int oldx, oldy, oldw, oldh;
  90         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91         int bw, oldbw;
  92         unsigned int tags;
  93         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94         Client *next;
  95         Client *snext;
  96         Monitor *mon;
  97         Window win;
  98 };
  99
 100 typedef struct {
 101         int x, y, w, h;
 102         unsigned long norm[ColLast];
 103         unsigned long sel[ColLast];
 104         Drawable drawable;
 105         GC gc;
 106         struct {
 107                 int ascent;
 108                 int descent;
 109                 int height;
 110                 XFontSet set;
 111                 XFontStruct *xfont;
 112         } font;
 113 } DC; /* draw context */
 114
 115 typedef struct {
 116         unsigned int mod;
 117         KeySym keysym;
 118         void (*func)(const Arg *);
 119         const Arg arg;
 120 } Key;
 121
 122 typedef struct {
 123         const char *symbol;
 124         void (*arrange)(Monitor *);
 125 } Layout;
 126
 127 struct Monitor {
 128         char ltsymbol[16];
 129         float mfact;
 130         int nmaster;
 131         int num;
 132         int by;               /* bar geometry */
 133         int mx, my, mw, mh;   /* screen size */
 134         int wx, wy, ww, wh;   /* window area  */
 135         unsigned int seltags;
 136         unsigned int sellt;
 137         unsigned int tagset[2];
 138         Bool showbar;
 139         Bool topbar;
 140         Client *clients;
 141         Client *sel;
 142         Client *stack;
 143         Monitor *next;
 144         Window barwin;
 145         const Layout *lt[2];
 146 };
 147
 148 typedef struct {
 149         const char *class;
 150         const char *instance;
 151         const char *title;
 152         unsigned int tags;
 153         Bool isfloating;
 154         int monitor;
 155 } Rule;
 156
 157 /* function declarations */
 158 static void applyrules(Client *c);
 159 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160 static void arrange(Monitor *m);
 161 static void arrangemon(Monitor *m);
 162 static void attach(Client *c);
 163 static void attachstack(Client *c);
 164 static void buttonpress(XEvent *e);
 165 static void checkotherwm(void);
 166 static void cleanup(void);
 167 static void cleanupmon(Monitor *mon);
 168 static void clearurgent(Client *c);
 169 static void clientmessage(XEvent *e);
 170 static void configure(Client *c);
 171 static void configurenotify(XEvent *e);
 172 static void configurerequest(XEvent *e);
 173 static Monitor *createmon(void);
 174 static void destroynotify(XEvent *e);
 175 static void detach(Client *c);
 176 static void detachstack(Client *c);
 177 static void die(const char *errstr, ...);
 178 static Monitor *dirtomon(int dir);
 179 static void drawbar(Monitor *m);
 180 static void drawbars(void);
 181 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183 static void enternotify(XEvent *e);
 184 static void expose(XEvent *e);
 185 static void focus(Client *c);
 186 static void focusin(XEvent *e);
 187 static void focusmon(const Arg *arg);
 188 static void focusstack(const Arg *arg);
 189 static unsigned long getcolor(const char *colstr);
 190 static Bool getrootptr(int *x, int *y);
 191 static long getstate(Window w);
 192 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193 static void grabbuttons(Client *c, Bool focused);
 194 static void grabkeys(void);
 195 static void incnmaster(const Arg *arg);
 196 static void initfont(const char *fontstr);
 197 static void keypress(XEvent *e);
 198 static void killclient(const Arg *arg);
 199 static void manage(Window w, XWindowAttributes *wa);
 200 static void mappingnotify(XEvent *e);
 201 static void maprequest(XEvent *e);
 202 static void monocle(Monitor *m);
 203 static void 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 updatenumlockmask(void);
 242 static void updatesizehints(Client *c);
 243 static void updatestatus(void);
 244 static void updatewindowtype(Client *c);
 245 static void updatetitle(Client *c);
 246 static void updatewmhints(Client *c);
 247 static void view(const Arg *arg);
 248 static Client *wintoclient(Window w);
 249 static Monitor *wintomon(Window w);
 250 static int xerror(Display *dpy, XErrorEvent *ee);
 251 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 252 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 253 static void zoom(const Arg *arg);
 254
 255 /* variables */
 256 static const char broken[] = "broken";
 257 static char stext[256];
 258 static int screen;
 259 static int sw, sh;           /* X display screen geometry width, height */
 260 static int bh, blw = 0;      /* bar geometry */
 261 static int (*xerrorxlib)(Display *, XErrorEvent *);
 262 static unsigned int numlockmask = 0;
 263 static void (*handler[LASTEvent]) (XEvent *) = {
 264         [ButtonPress] = buttonpress,
 265         [ClientMessage] = clientmessage,
 266         [ConfigureRequest] = configurerequest,
 267         [ConfigureNotify] = configurenotify,
 268         [DestroyNotify] = destroynotify,
 269         [EnterNotify] = enternotify,
 270         [Expose] = expose,
 271         [FocusIn] = focusin,
 272         [KeyPress] = keypress,
 273         [MappingNotify] = mappingnotify,
 274         [MapRequest] = maprequest,
 275         [MotionNotify] = motionnotify,
 276         [PropertyNotify] = propertynotify,
 277         [UnmapNotify] = unmapnotify
 278 };
 279 static Atom wmatom[WMLast], netatom[NetLast];
 280 static Bool running = True;
 281 static Cursor cursor[CurLast];
 282 static Display *dpy;
 283 static DC dc;
 284 static Monitor *mons = NULL, *selmon = NULL;
 285 static Window root;
 286
 287 /* configuration, allows nested code to access above variables */
 288 #include "config.h"
 289
 290 /* compile-time check if all tags fit into an unsigned int bit array. */
 291 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 292
 293 /* function implementations */
 294 void
 295 applyrules(Client *c) {
 296         const char *class, *instance;
 297         unsigned int i;
 298         const Rule *r;
 299         Monitor *m;
 300         XClassHint ch = { NULL, NULL };
 301
 302         /* rule matching */
 303         c->isfloating = c->tags = 0;
 304         XGetClassHint(dpy, c->win, &ch);
 305         class    = ch.res_class ? ch.res_class : broken;
 306         instance = ch.res_name  ? ch.res_name  : broken;
 307
 308         for(i = 0; i < LENGTH(rules); i++) {
 309                 r = &rules[i];
 310                 if((!r->title || strstr(c->name, r->title))
 311                 && (!r->class || strstr(class, r->class))
 312                 && (!r->instance || strstr(instance, r->instance)))
 313                 {
 314                         c->isfloating = r->isfloating;
 315                         c->tags |= r->tags;
 316                         for(m = mons; m && m->num != r->monitor; m = m->next);
 317                         if(m)
 318                                 c->mon = m;
 319                 }
 320         }
 321         if(ch.res_class)
 322                 XFree(ch.res_class);
 323         if(ch.res_name)
 324                 XFree(ch.res_name);
 325         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 326 }
 327
 328 Bool
 329 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 330         Bool baseismin;
 331         Monitor *m = c->mon;
 332
 333         /* set minimum possible */
 334         *w = MAX(1, *w);
 335         *h = MAX(1, *h);
 336         if(interact) {
 337                 if(*x > sw)
 338                         *x = sw - WIDTH(c);
 339                 if(*y > sh)
 340                         *y = sh - HEIGHT(c);
 341                 if(*x + *w + 2 * c->bw < 0)
 342                         *x = 0;
 343                 if(*y + *h + 2 * c->bw < 0)
 344                         *y = 0;
 345         }
 346         else {
 347                 if(*x >= m->wx + m->ww)
 348                         *x = m->wx + m->ww - WIDTH(c);
 349                 if(*y >= m->wy + m->wh)
 350                         *y = m->wy + m->wh - HEIGHT(c);
 351                 if(*x + *w + 2 * c->bw <= m->wx)
 352                         *x = m->wx;
 353                 if(*y + *h + 2 * c->bw <= m->wy)
 354                         *y = m->wy;
 355         }
 356         if(*h < bh)
 357                 *h = bh;
 358         if(*w < bh)
 359                 *w = bh;
 360         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 361                 /* see last two sentences in ICCCM 4.1.2.3 */
 362                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 363                 if(!baseismin) { /* temporarily remove base dimensions */
 364                         *w -= c->basew;
 365                         *h -= c->baseh;
 366                 }
 367                 /* adjust for aspect limits */
 368                 if(c->mina > 0 && c->maxa > 0) {
 369                         if(c->maxa < (float)*w / *h)
 370                                 *w = *h * c->maxa + 0.5;
 371                         else if(c->mina < (float)*h / *w)
 372                                 *h = *w * c->mina + 0.5;
 373                 }
 374                 if(baseismin) { /* increment calculation requires this */
 375                         *w -= c->basew;
 376                         *h -= c->baseh;
 377                 }
 378                 /* adjust for increment value */
 379                 if(c->incw)
 380                         *w -= *w % c->incw;
 381                 if(c->inch)
 382                         *h -= *h % c->inch;
 383                 /* restore base dimensions */
 384                 *w = MAX(*w + c->basew, c->minw);
 385                 *h = MAX(*h + c->baseh, c->minh);
 386                 if(c->maxw)
 387                         *w = MIN(*w, c->maxw);
 388                 if(c->maxh)
 389                         *h = MIN(*h, c->maxh);
 390         }
 391         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 392 }
 393
 394 void
 395 arrange(Monitor *m) {
 396         if(m)
 397                 showhide(m->stack);
 398         else for(m = mons; m; m = m->next)
 399                 showhide(m->stack);
 400         if(m)
 401                 arrangemon(m);
 402         else for(m = mons; m; m = m->next)
 403                 arrangemon(m);
 404 }
 405
 406 void
 407 arrangemon(Monitor *m) {
 408         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 409         if(m->lt[m->sellt]->arrange)
 410                 m->lt[m->sellt]->arrange(m);
 411         restack(m);
 412 }
 413
 414 void
 415 attach(Client *c) {
 416         c->next = c->mon->clients;
 417         c->mon->clients = c;
 418 }
 419
 420 void
 421 attachstack(Client *c) {
 422         c->snext = c->mon->stack;
 423         c->mon->stack = c;
 424 }
 425
 426 void
 427 buttonpress(XEvent *e) {
 428         unsigned int i, x, click;
 429         Arg arg = {0};
 430         Client *c;
 431         Monitor *m;
 432         XButtonPressedEvent *ev = &e->xbutton;
 433
 434         click = ClkRootWin;
 435         /* focus monitor if necessary */
 436         if((m = wintomon(ev->window)) && m != selmon) {
 437                 unfocus(selmon->sel, True);
 438                 selmon = m;
 439                 focus(NULL);
 440         }
 441         if(ev->window == selmon->barwin) {
 442                 i = x = 0;
 443                 do
 444                         x += TEXTW(tags[i]);
 445                 while(ev->x >= x && ++i < LENGTH(tags));
 446                 if(i < LENGTH(tags)) {
 447                         click = ClkTagBar;
 448                         arg.ui = 1 << i;
 449                 }
 450                 else if(ev->x < x + blw)
 451                         click = ClkLtSymbol;
 452                 else if(ev->x > selmon->ww - TEXTW(stext))
 453                         click = ClkStatusText;
 454                 else
 455                         click = ClkWinTitle;
 456         }
 457         else if((c = wintoclient(ev->window))) {
 458                 focus(c);
 459                 click = ClkClientWin;
 460         }
 461         for(i = 0; i < LENGTH(buttons); i++)
 462                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 463                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 464                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 465 }
 466
 467 void
 468 checkotherwm(void) {
 469         xerrorxlib = XSetErrorHandler(xerrorstart);
 470         /* this causes an error if some other window manager is running */
 471         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 472         XSync(dpy, False);
 473         XSetErrorHandler(xerror);
 474         XSync(dpy, False);
 475 }
 476
 477 void
 478 cleanup(void) {
 479         Arg a = {.ui = ~0};
 480         Layout foo = { "", NULL };
 481         Monitor *m;
 482
 483         view(&a);
 484         selmon->lt[selmon->sellt] = &foo;
 485         for(m = mons; m; m = m->next)
 486                 while(m->stack)
 487                         unmanage(m->stack, False);
 488         if(dc.font.set)
 489                 XFreeFontSet(dpy, dc.font.set);
 490         else
 491                 XFreeFont(dpy, dc.font.xfont);
 492         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 493         XFreePixmap(dpy, dc.drawable);
 494         XFreeGC(dpy, dc.gc);
 495         XFreeCursor(dpy, cursor[CurNormal]);
 496         XFreeCursor(dpy, cursor[CurResize]);
 497         XFreeCursor(dpy, cursor[CurMove]);
 498         while(mons)
 499                 cleanupmon(mons);
 500         XSync(dpy, False);
 501         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 502 }
 503
 504 void
 505 cleanupmon(Monitor *mon) {
 506         Monitor *m;
 507
 508         if(mon == mons)
 509                 mons = mons->next;
 510         else {
 511                 for(m = mons; m && m->next != mon; m = m->next);
 512                 m->next = mon->next;
 513         }
 514         XUnmapWindow(dpy, mon->barwin);
 515         XDestroyWindow(dpy, mon->barwin);
 516         free(mon);
 517 }
 518
 519 void
 520 clearurgent(Client *c) {
 521         XWMHints *wmh;
 522
 523         c->isurgent = False;
 524         if(!(wmh = XGetWMHints(dpy, c->win)))
 525                 return;
 526         wmh->flags &= ~XUrgencyHint;
 527         XSetWMHints(dpy, c->win, wmh);
 528         XFree(wmh);
 529 }
 530
 531 void
 532 clientmessage(XEvent *e) {
 533         XClientMessageEvent *cme = &e->xclient;
 534         Client *c = wintoclient(cme->window);
 535
 536         if(!c)
 537                 return;
 538         if(cme->message_type == netatom[NetWMState]) {
 539                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 540                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 541                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 542         }
 543         else if(cme->message_type == netatom[NetActiveWindow]) {
 544                 if(!ISVISIBLE(c)) {
 545                         c->mon->seltags ^= 1;
 546                         c->mon->tagset[c->mon->seltags] = c->tags;
 547                 }
 548                 pop(c);
 549         }
 550 }
 551
 552 void
 553 configure(Client *c) {
 554         XConfigureEvent ce;
 555
 556         ce.type = ConfigureNotify;
 557         ce.display = dpy;
 558         ce.event = c->win;
 559         ce.window = c->win;
 560         ce.x = c->x;
 561         ce.y = c->y;
 562         ce.width = c->w;
 563         ce.height = c->h;
 564         ce.border_width = c->bw;
 565         ce.above = None;
 566         ce.override_redirect = False;
 567         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 568 }
 569
 570 void
 571 configurenotify(XEvent *e) {
 572         Monitor *m;
 573         XConfigureEvent *ev = &e->xconfigure;
 574         Bool dirty;
 575
 576         if(ev->window == root) {
 577                 dirty = (sw != ev->width);
 578                 sw = ev->width;
 579                 sh = ev->height;
 580                 if(updategeom() || dirty) {
 581                         if(dc.drawable != 0)
 582                                 XFreePixmap(dpy, dc.drawable);
 583                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 584                         updatebars();
 585                         for(m = mons; m; m = m->next)
 586                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 587                         focus(NULL);
 588                         arrange(NULL);
 589                 }
 590         }
 591 }
 592
 593 void
 594 configurerequest(XEvent *e) {
 595         Client *c;
 596         Monitor *m;
 597         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 598         XWindowChanges wc;
 599
 600         if((c = wintoclient(ev->window))) {
 601                 if(ev->value_mask & CWBorderWidth)
 602                         c->bw = ev->border_width;
 603                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 604                         m = c->mon;
 605                         if(ev->value_mask & CWX) {
 606                                 c->oldx = c->x;
 607                                 c->x = m->mx + ev->x;
 608                         }
 609                         if(ev->value_mask & CWY) {
 610                                 c->oldy = c->y;
 611                                 c->y = m->my + ev->y;
 612                         }
 613                         if(ev->value_mask & CWWidth) {
 614                                 c->oldw = c->w;
 615                                 c->w = ev->width;
 616                         }
 617                         if(ev->value_mask & CWHeight) {
 618                                 c->oldh = c->h;
 619                                 c->h = ev->height;
 620                         }
 621                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 622                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 623                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 624                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 625                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 626                                 configure(c);
 627                         if(ISVISIBLE(c))
 628                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 629                 }
 630                 else
 631                         configure(c);
 632         }
 633         else {
 634                 wc.x = ev->x;
 635                 wc.y = ev->y;
 636                 wc.width = ev->width;
 637                 wc.height = ev->height;
 638                 wc.border_width = ev->border_width;
 639                 wc.sibling = ev->above;
 640                 wc.stack_mode = ev->detail;
 641                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 642         }
 643         XSync(dpy, False);
 644 }
 645
 646 Monitor *
 647 createmon(void) {
 648         Monitor *m;
 649
 650         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 651                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 652         m->tagset[0] = m->tagset[1] = 1;
 653         m->mfact = mfact;
 654         m->nmaster = nmaster;
 655         m->showbar = showbar;
 656         m->topbar = topbar;
 657         m->lt[0] = &layouts[0];
 658         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 659         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 660         return m;
 661 }
 662
 663 void
 664 destroynotify(XEvent *e) {
 665         Client *c;
 666         XDestroyWindowEvent *ev = &e->xdestroywindow;
 667
 668         if((c = wintoclient(ev->window)))
 669                 unmanage(c, True);
 670 }
 671
 672 void
 673 detach(Client *c) {
 674         Client **tc;
 675
 676         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 677         *tc = c->next;
 678 }
 679
 680 void
 681 detachstack(Client *c) {
 682         Client **tc, *t;
 683
 684         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 685         *tc = c->snext;
 686
 687         if(c == c->mon->sel) {
 688                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 689                 c->mon->sel = t;
 690         }
 691 }
 692
 693 void
 694 die(const char *errstr, ...) {
 695         va_list ap;
 696
 697         va_start(ap, errstr);
 698         vfprintf(stderr, errstr, ap);
 699         va_end(ap);
 700         exit(EXIT_FAILURE);
 701 }
 702
 703 Monitor *
 704 dirtomon(int dir) {
 705         Monitor *m = NULL;
 706
 707         if(dir > 0) {
 708                 if(!(m = selmon->next))
 709                         m = mons;
 710         }
 711         else if(selmon == mons)
 712                 for(m = mons; m->next; m = m->next);
 713         else
 714                 for(m = mons; m->next != selmon; m = m->next);
 715         return m;
 716 }
 717
 718 void
 719 drawbar(Monitor *m) {
 720         int x;
 721         unsigned int i, occ = 0, urg = 0;
 722         unsigned long *col;
 723         Client *c;
 724
 725         for(c = m->clients; c; c = c->next) {
 726                 occ |= c->tags;
 727                 if(c->isurgent)
 728                         urg |= c->tags;
 729         }
 730         dc.x = 0;
 731         for(i = 0; i < LENGTH(tags); i++) {
 732                 dc.w = TEXTW(tags[i]);
 733                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 734                 drawtext(tags[i], col, urg & 1 << i);
 735                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 736                            occ & 1 << i, urg & 1 << i, col);
 737                 dc.x += dc.w;
 738         }
 739         dc.w = blw = TEXTW(m->ltsymbol);
 740         drawtext(m->ltsymbol, dc.norm, False);
 741         dc.x += dc.w;
 742         x = dc.x;
 743         if(m == selmon) { /* status is only drawn on selected monitor */
 744                 dc.w = TEXTW(stext);
 745                 dc.x = m->ww - dc.w;
 746                 if(dc.x < x) {
 747                         dc.x = x;
 748                         dc.w = m->ww - x;
 749                 }
 750                 drawtext(stext, dc.norm, False);
 751         }
 752         else
 753                 dc.x = m->ww;
 754         if((dc.w = dc.x - x) > bh) {
 755                 dc.x = x;
 756                 if(m->sel) {
 757                         col = m == selmon ? dc.sel : dc.norm;
 758                         drawtext(m->sel->name, col, False);
 759                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 760                 }
 761                 else
 762                         drawtext(NULL, dc.norm, False);
 763         }
 764         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 765         XSync(dpy, False);
 766 }
 767
 768 void
 769 drawbars(void) {
 770         Monitor *m;
 771
 772         for(m = mons; m; m = m->next)
 773                 drawbar(m);
 774 }
 775
 776 void
 777 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 778         int x;
 779
 780         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 781         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 782         if(filled)
 783                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 784         else if(empty)
 785                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 786 }
 787
 788 void
 789 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 790         char buf[256];
 791         int i, x, y, h, len, olen;
 792
 793         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 794         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 795         if(!text)
 796                 return;
 797         olen = strlen(text);
 798         h = dc.font.ascent + dc.font.descent;
 799         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 800         x = dc.x + (h / 2);
 801         /* shorten text if necessary */
 802         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 803         if(!len)
 804                 return;
 805         memcpy(buf, text, len);
 806         if(len < olen)
 807                 for(i = len; i && i > len - 3; buf[--i] = '.');
 808         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 809         if(dc.font.set)
 810                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 811         else
 812                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 813 }
 814
 815 void
 816 enternotify(XEvent *e) {
 817         Client *c;
 818         Monitor *m;
 819         XCrossingEvent *ev = &e->xcrossing;
 820
 821         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 822                 return;
 823         c = wintoclient(ev->window);
 824         m = c ? c->mon : wintomon(ev->window);
 825         if(m != selmon) {
 826                 unfocus(selmon->sel, True);
 827                 selmon = m;
 828         }
 829         else if(!c || c == selmon->sel)
 830                 return;
 831         focus(c);
 832 }
 833
 834 void
 835 expose(XEvent *e) {
 836         Monitor *m;
 837         XExposeEvent *ev = &e->xexpose;
 838
 839         if(ev->count == 0 && (m = wintomon(ev->window)))
 840                 drawbar(m);
 841 }
 842
 843 void
 844 focus(Client *c) {
 845         if(!c || !ISVISIBLE(c))
 846                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 847         /* was if(selmon->sel) */
 848         if(selmon->sel && selmon->sel != c)
 849                 unfocus(selmon->sel, False);
 850         if(c) {
 851                 if(c->mon != selmon)
 852                         selmon = c->mon;
 853                 if(c->isurgent)
 854                         clearurgent(c);
 855                 detachstack(c);
 856                 attachstack(c);
 857                 grabbuttons(c, True);
 858                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 859                 setfocus(c);
 860         }
 861         else
 862                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 863         selmon->sel = c;
 864         drawbars();
 865 }
 866
 867 void
 868 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 869         XFocusChangeEvent *ev = &e->xfocus;
 870
 871         if(selmon->sel && ev->window != selmon->sel->win)
 872                 setfocus(selmon->sel);
 873 }
 874
 875 void
 876 focusmon(const Arg *arg) {
 877         Monitor *m;
 878
 879         if(!mons->next)
 880                 return;
 881         if((m = dirtomon(arg->i)) == selmon)
 882                 return;
 883         unfocus(selmon->sel, True);
 884         selmon = m;
 885         focus(NULL);
 886 }
 887
 888 void
 889 focusstack(const Arg *arg) {
 890         Client *c = NULL, *i;
 891
 892         if(!selmon->sel)
 893                 return;
 894         if(arg->i > 0) {
 895                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 896                 if(!c)
 897                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 898         }
 899         else {
 900                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 901                         if(ISVISIBLE(i))
 902                                 c = i;
 903                 if(!c)
 904                         for(; i; i = i->next)
 905                                 if(ISVISIBLE(i))
 906                                         c = i;
 907         }
 908         if(c) {
 909                 focus(c);
 910                 restack(selmon);
 911         }
 912 }
 913
 914 Atom
 915 getatomprop(Client *c, Atom prop) {
 916         int di;
 917         unsigned long dl;
 918         unsigned char *p = NULL;
 919         Atom da, atom = None;
 920
 921         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 922                               &da, &di, &dl, &dl, &p) == Success && p) {
 923                 atom = *(Atom *)p;
 924                 XFree(p);
 925         }
 926         return atom;
 927 }
 928
 929 unsigned long
 930 getcolor(const char *colstr) {
 931         Colormap cmap = DefaultColormap(dpy, screen);
 932         XColor color;
 933
 934         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 935                 die("error, cannot allocate color '%s'\n", colstr);
 936         return color.pixel;
 937 }
 938
 939 Bool
 940 getrootptr(int *x, int *y) {
 941         int di;
 942         unsigned int dui;
 943         Window dummy;
 944
 945         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 946 }
 947
 948 long
 949 getstate(Window w) {
 950         int format;
 951         long result = -1;
 952         unsigned char *p = NULL;
 953         unsigned long n, extra;
 954         Atom real;
 955
 956         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 957                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 958                 return -1;
 959         if(n != 0)
 960                 result = *p;
 961         XFree(p);
 962         return result;
 963 }
 964
 965 Bool
 966 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 967         char **list = NULL;
 968         int n;
 969         XTextProperty name;
 970
 971         if(!text || size == 0)
 972                 return False;
 973         text[0] = '\0';
 974         XGetTextProperty(dpy, w, &name, atom);
 975         if(!name.nitems)
 976                 return False;
 977         if(name.encoding == XA_STRING)
 978                 strncpy(text, (char *)name.value, size - 1);
 979         else {
 980                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 981                         strncpy(text, *list, size - 1);
 982                         XFreeStringList(list);
 983                 }
 984         }
 985         text[size - 1] = '\0';
 986         XFree(name.value);
 987         return True;
 988 }
 989
 990 void
 991 grabbuttons(Client *c, Bool focused) {
 992         updatenumlockmask();
 993         {
 994                 unsigned int i, j;
 995                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 996                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 997                 if(focused) {
 998                         for(i = 0; i < LENGTH(buttons); i++)
 999                                 if(buttons[i].click == ClkClientWin)
1000                                         for(j = 0; j < LENGTH(modifiers); j++)
1001                                                 XGrabButton(dpy, buttons[i].button,
1002                                                             buttons[i].mask | modifiers[j],
1003                                                             c->win, False, BUTTONMASK,
1004                                                             GrabModeAsync, GrabModeSync, None, None);
1005                 }
1006                 else
1007                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1008                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1009         }
1010 }
1011
1012 void
1013 grabkeys(void) {
1014         updatenumlockmask();
1015         {
1016                 unsigned int i, j;
1017                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1018                 KeyCode code;
1019
1020                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1021                 for(i = 0; i < LENGTH(keys); i++)
1022                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1023                                 for(j = 0; j < LENGTH(modifiers); j++)
1024                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1025                                                  True, GrabModeAsync, GrabModeAsync);
1026         }
1027 }
1028
1029 void
1030 incnmaster(const Arg *arg) {
1031         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1032         arrange(selmon);
1033 }
1034
1035 void
1036 initfont(const char *fontstr) {
1037         char *def, **missing;
1038         int n;
1039
1040         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1041         if(missing) {
1042                 while(n--)
1043                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1044                 XFreeStringList(missing);
1045         }
1046         if(dc.font.set) {
1047                 XFontStruct **xfonts;
1048                 char **font_names;
1049
1050                 dc.font.ascent = dc.font.descent = 0;
1051                 XExtentsOfFontSet(dc.font.set);
1052                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1053                 while(n--) {
1054                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1055                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1056                         xfonts++;
1057                 }
1058         }
1059         else {
1060                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1061                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1062                         die("error, cannot load font: '%s'\n", fontstr);
1063                 dc.font.ascent = dc.font.xfont->ascent;
1064                 dc.font.descent = dc.font.xfont->descent;
1065         }
1066         dc.font.height = dc.font.ascent + dc.font.descent;
1067 }
1068
1069 #ifdef XINERAMA
1070 static Bool
1071 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1072         while(n--)
1073                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1074                 && unique[n].width == info->width && unique[n].height == info->height)
1075                         return False;
1076         return True;
1077 }
1078 #endif /* XINERAMA */
1079
1080 void
1081 keypress(XEvent *e) {
1082         unsigned int i;
1083         KeySym keysym;
1084         XKeyEvent *ev;
1085
1086         ev = &e->xkey;
1087         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1088         for(i = 0; i < LENGTH(keys); i++)
1089                 if(keysym == keys[i].keysym
1090                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1091                 && keys[i].func)
1092                         keys[i].func(&(keys[i].arg));
1093 }
1094
1095 void
1096 killclient(const Arg *arg) {
1097         if(!selmon->sel)
1098                 return;
1099         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1100                 XGrabServer(dpy);
1101                 XSetErrorHandler(xerrordummy);
1102                 XSetCloseDownMode(dpy, DestroyAll);
1103                 XKillClient(dpy, selmon->sel->win);
1104                 XSync(dpy, False);
1105                 XSetErrorHandler(xerror);
1106                 XUngrabServer(dpy);
1107         }
1108 }
1109
1110 void
1111 manage(Window w, XWindowAttributes *wa) {
1112         Client *c, *t = NULL;
1113         Window trans = None;
1114         XWindowChanges wc;
1115
1116         if(!(c = calloc(1, sizeof(Client))))
1117                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1118         c->win = w;
1119         updatetitle(c);
1120         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1121                 c->mon = t->mon;
1122                 c->tags = t->tags;
1123         }
1124         else {
1125                 c->mon = selmon;
1126                 applyrules(c);
1127         }
1128         /* geometry */
1129         c->x = c->oldx = wa->x;
1130         c->y = c->oldy = wa->y;
1131         c->w = c->oldw = wa->width;
1132         c->h = c->oldh = wa->height;
1133         c->oldbw = wa->border_width;
1134
1135         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1136                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1137         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1138                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1139         c->x = MAX(c->x, c->mon->mx);
1140         /* only fix client y-offset, if the client center might cover the bar */
1141         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1142                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1143         c->bw = borderpx;
1144
1145         wc.border_width = c->bw;
1146         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1147         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1148         configure(c); /* propagates border_width, if size doesn't change */
1149         updatewindowtype(c);
1150         updatesizehints(c);
1151         updatewmhints(c);
1152         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1153         grabbuttons(c, False);
1154         if(!c->isfloating)
1155                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1156         if(c->isfloating)
1157                 XRaiseWindow(dpy, c->win);
1158         attach(c);
1159         attachstack(c);
1160         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1161         setclientstate(c, NormalState);
1162         if (c->mon == selmon)
1163                 unfocus(selmon->sel, False);
1164         c->mon->sel = c;
1165         arrange(c->mon);
1166         XMapWindow(dpy, c->win);
1167         focus(NULL);
1168 }
1169
1170 void
1171 mappingnotify(XEvent *e) {
1172         XMappingEvent *ev = &e->xmapping;
1173
1174         XRefreshKeyboardMapping(ev);
1175         if(ev->request == MappingKeyboard)
1176                 grabkeys();
1177 }
1178
1179 void
1180 maprequest(XEvent *e) {
1181         static XWindowAttributes wa;
1182         XMapRequestEvent *ev = &e->xmaprequest;
1183
1184         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1185                 return;
1186         if(wa.override_redirect)
1187                 return;
1188         if(!wintoclient(ev->window))
1189                 manage(ev->window, &wa);
1190 }
1191
1192 void
1193 monocle(Monitor *m) {
1194         unsigned int n = 0;
1195         Client *c;
1196
1197         for(c = m->clients; c; c = c->next)
1198                 if(ISVISIBLE(c))
1199                         n++;
1200         if(n > 0) /* override layout symbol */
1201                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1202         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1203                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1204 }
1205
1206 void
1207 motionnotify(XEvent *e) {
1208         static Monitor *mon = NULL;
1209         Monitor *m;
1210         XMotionEvent *ev = &e->xmotion;
1211
1212         if(ev->window != root)
1213                 return;
1214         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1215                 selmon = m;
1216                 focus(NULL);
1217         }
1218         mon = m;
1219 }
1220
1221 void
1222 movemouse(const Arg *arg) {
1223         int x, y, ocx, ocy, nx, ny;
1224         Client *c;
1225         Monitor *m;
1226         XEvent ev;
1227
1228         if(!(c = selmon->sel))
1229                 return;
1230         restack(selmon);
1231         ocx = c->x;
1232         ocy = c->y;
1233         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1234         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1235                 return;
1236         if(!getrootptr(&x, &y))
1237                 return;
1238         do {
1239                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1240                 switch(ev.type) {
1241                 case ConfigureRequest:
1242                 case Expose:
1243                 case MapRequest:
1244                         handler[ev.type](&ev);
1245                         break;
1246                 case MotionNotify:
1247                         nx = ocx + (ev.xmotion.x - x);
1248                         ny = ocy + (ev.xmotion.y - y);
1249                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1250                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1251                                 if(abs(selmon->wx - nx) < snap)
1252                                         nx = selmon->wx;
1253                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1254                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1255                                 if(abs(selmon->wy - ny) < snap)
1256                                         ny = selmon->wy;
1257                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1258                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1259                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1260                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1261                                         togglefloating(NULL);
1262                         }
1263                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1264                                 resize(c, nx, ny, c->w, c->h, True);
1265                         break;
1266                 }
1267         } while(ev.type != ButtonRelease);
1268         XUngrabPointer(dpy, CurrentTime);
1269         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1270                 sendmon(c, m);
1271                 selmon = m;
1272                 focus(NULL);
1273         }
1274 }
1275
1276 Client *
1277 nexttiled(Client *c) {
1278         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1279         return c;
1280 }
1281
1282 void
1283 pop(Client *c) {
1284         detach(c);
1285         attach(c);
1286         focus(c);
1287         arrange(c->mon);
1288 }
1289
1290 void
1291 propertynotify(XEvent *e) {
1292         Client *c;
1293         Window trans;
1294         XPropertyEvent *ev = &e->xproperty;
1295
1296         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1297                 updatestatus();
1298         else if(ev->state == PropertyDelete)
1299                 return; /* ignore */
1300         else if((c = wintoclient(ev->window))) {
1301                 switch(ev->atom) {
1302                 default: break;
1303                 case XA_WM_TRANSIENT_FOR:
1304                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1305                            (c->isfloating = (wintoclient(trans)) != NULL))
1306                                 arrange(c->mon);
1307                         break;
1308                 case XA_WM_NORMAL_HINTS:
1309                         updatesizehints(c);
1310                         break;
1311                 case XA_WM_HINTS:
1312                         updatewmhints(c);
1313                         drawbars();
1314                         break;
1315                 }
1316                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1317                         updatetitle(c);
1318                         if(c == c->mon->sel)
1319                                 drawbar(c->mon);
1320                 }
1321                 if(ev->atom == netatom[NetWMWindowType])
1322                         updatewindowtype(c);
1323         }
1324 }
1325
1326 void
1327 quit(const Arg *arg) {
1328         running = False;
1329 }
1330
1331 Monitor *
1332 recttomon(int x, int y, int w, int h) {
1333         Monitor *m, *r = selmon;
1334         int a, area = 0;
1335
1336         for(m = mons; m; m = m->next)
1337                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1338                         area = a;
1339                         r = m;
1340                 }
1341         return r;
1342 }
1343
1344 void
1345 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1346         if(applysizehints(c, &x, &y, &w, &h, interact))
1347                 resizeclient(c, x, y, w, h);
1348 }
1349
1350 void
1351 resizeclient(Client *c, int x, int y, int w, int h) {
1352         XWindowChanges wc;
1353
1354         c->oldx = c->x; c->x = wc.x = x;
1355         c->oldy = c->y; c->y = wc.y = y;
1356         c->oldw = c->w; c->w = wc.width = w;
1357         c->oldh = c->h; c->h = wc.height = h;
1358         wc.border_width = c->bw;
1359         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1360         configure(c);
1361         XSync(dpy, False);
1362 }
1363
1364 void
1365 resizemouse(const Arg *arg) {
1366         int ocx, ocy;
1367         int nw, nh;
1368         Client *c;
1369         Monitor *m;
1370         XEvent ev;
1371
1372         if(!(c = selmon->sel))
1373                 return;
1374         restack(selmon);
1375         ocx = c->x;
1376         ocy = c->y;
1377         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1378                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1379                 return;
1380         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1381         do {
1382                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1383                 switch(ev.type) {
1384                 case ConfigureRequest:
1385                 case Expose:
1386                 case MapRequest:
1387                         handler[ev.type](&ev);
1388                         break;
1389                 case MotionNotify:
1390                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1391                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1392                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1393                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1394                         {
1395                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1396                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1397                                         togglefloating(NULL);
1398                         }
1399                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1400                                 resize(c, c->x, c->y, nw, nh, True);
1401                         break;
1402                 }
1403         } while(ev.type != ButtonRelease);
1404         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1405         XUngrabPointer(dpy, CurrentTime);
1406         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1407         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1408                 sendmon(c, m);
1409                 selmon = m;
1410                 focus(NULL);
1411         }
1412 }
1413
1414 void
1415 restack(Monitor *m) {
1416         Client *c;
1417         XEvent ev;
1418         XWindowChanges wc;
1419
1420         drawbar(m);
1421         if(!m->sel)
1422                 return;
1423         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1424                 XRaiseWindow(dpy, m->sel->win);
1425         if(m->lt[m->sellt]->arrange) {
1426                 wc.stack_mode = Below;
1427                 wc.sibling = m->barwin;
1428                 for(c = m->stack; c; c = c->snext)
1429                         if(!c->isfloating && ISVISIBLE(c)) {
1430                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1431                                 wc.sibling = c->win;
1432                         }
1433         }
1434         XSync(dpy, False);
1435         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1436 }
1437
1438 void
1439 run(void) {
1440         XEvent ev;
1441         /* main event loop */
1442         XSync(dpy, False);
1443         while(running && !XNextEvent(dpy, &ev))
1444                 if(handler[ev.type])
1445                         handler[ev.type](&ev); /* call handler */
1446 }
1447
1448 void
1449 scan(void) {
1450         unsigned int i, num;
1451         Window d1, d2, *wins = NULL;
1452         XWindowAttributes wa;
1453
1454         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1455                 for(i = 0; i < num; i++) {
1456                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1457                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1458                                 continue;
1459                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1460                                 manage(wins[i], &wa);
1461                 }
1462                 for(i = 0; i < num; i++) { /* now the transients */
1463                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1464                                 continue;
1465                         if(XGetTransientForHint(dpy, wins[i], &d1)
1466                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1467                                 manage(wins[i], &wa);
1468                 }
1469                 if(wins)
1470                         XFree(wins);
1471         }
1472 }
1473
1474 void
1475 sendmon(Client *c, Monitor *m) {
1476         if(c->mon == m)
1477                 return;
1478         unfocus(c, True);
1479         detach(c);
1480         detachstack(c);
1481         c->mon = m;
1482         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1483         attach(c);
1484         attachstack(c);
1485         focus(NULL);
1486         arrange(NULL);
1487 }
1488
1489 void
1490 setclientstate(Client *c, long state) {
1491         long data[] = { state, None };
1492
1493         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1494                         PropModeReplace, (unsigned char *)data, 2);
1495 }
1496
1497 Bool
1498 sendevent(Client *c, Atom proto) {
1499         int n;
1500         Atom *protocols;
1501         Bool exists = False;
1502         XEvent ev;
1503
1504         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1505                 while(!exists && n--)
1506                         exists = protocols[n] == proto;
1507                 XFree(protocols);
1508         }
1509         if(exists) {
1510                 ev.type = ClientMessage;
1511                 ev.xclient.window = c->win;
1512                 ev.xclient.message_type = wmatom[WMProtocols];
1513                 ev.xclient.format = 32;
1514                 ev.xclient.data.l[0] = proto;
1515                 ev.xclient.data.l[1] = CurrentTime;
1516                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1517         }
1518         return exists;
1519 }
1520
1521 void
1522 setfocus(Client *c) {
1523         if(!c->neverfocus)
1524                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1525         sendevent(c, wmatom[WMTakeFocus]);
1526 }
1527
1528 void
1529 setfullscreen(Client *c, Bool fullscreen) {
1530         if(fullscreen) {
1531                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1532                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1533                 c->isfullscreen = True;
1534                 c->oldstate = c->isfloating;
1535                 c->oldbw = c->bw;
1536                 c->bw = 0;
1537                 c->isfloating = True;
1538                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1539                 XRaiseWindow(dpy, c->win);
1540         }
1541         else {
1542                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1543                                 PropModeReplace, (unsigned char*)0, 0);
1544                 c->isfullscreen = False;
1545                 c->isfloating = c->oldstate;
1546                 c->bw = c->oldbw;
1547                 c->x = c->oldx;
1548                 c->y = c->oldy;
1549                 c->w = c->oldw;
1550                 c->h = c->oldh;
1551                 resizeclient(c, c->x, c->y, c->w, c->h);
1552                 arrange(c->mon);
1553         }
1554 }
1555
1556 void
1557 setlayout(const Arg *arg) {
1558         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1559                 selmon->sellt ^= 1;
1560         if(arg && arg->v)
1561                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1562         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1563         if(selmon->sel)
1564                 arrange(selmon);
1565         else
1566                 drawbar(selmon);
1567 }
1568
1569 /* arg > 1.0 will set mfact absolutly */
1570 void
1571 setmfact(const Arg *arg) {
1572         float f;
1573
1574         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1575                 return;
1576         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1577         if(f < 0.1 || f > 0.9)
1578                 return;
1579         selmon->mfact = f;
1580         arrange(selmon);
1581 }
1582
1583 void
1584 setup(void) {
1585         XSetWindowAttributes wa;
1586
1587         /* clean up any zombies immediately */
1588         sigchld(0);
1589
1590         /* init screen */
1591         screen = DefaultScreen(dpy);
1592         root = RootWindow(dpy, screen);
1593         initfont(font);
1594         sw = DisplayWidth(dpy, screen);
1595         sh = DisplayHeight(dpy, screen);
1596         bh = dc.h = dc.font.height + 2;
1597         updategeom();
1598         /* init atoms */
1599         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1600         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1601         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1602         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1603         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1604         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1605         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1606         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1607         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1608         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1609         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1610         /* init cursors */
1611         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1612         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1613         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1614         /* init appearance */
1615         dc.norm[ColBorder] = getcolor(normbordercolor);
1616         dc.norm[ColBG] = getcolor(normbgcolor);
1617         dc.norm[ColFG] = getcolor(normfgcolor);
1618         dc.sel[ColBorder] = getcolor(selbordercolor);
1619         dc.sel[ColBG] = getcolor(selbgcolor);
1620         dc.sel[ColFG] = getcolor(selfgcolor);
1621         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1622         dc.gc = XCreateGC(dpy, root, 0, NULL);
1623         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1624         if(!dc.font.set)
1625                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1626         /* init bars */
1627         updatebars();
1628         updatestatus();
1629         /* EWMH support per view */
1630         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1631                         PropModeReplace, (unsigned char *) netatom, NetLast);
1632         /* select for events */
1633         wa.cursor = cursor[CurNormal];
1634         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1635                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1636         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1637         XSelectInput(dpy, root, wa.event_mask);
1638         grabkeys();
1639 }
1640
1641 void
1642 showhide(Client *c) {
1643         if(!c)
1644                 return;
1645         if(ISVISIBLE(c)) { /* show clients top down */
1646                 XMoveWindow(dpy, c->win, c->x, c->y);
1647                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1648                         resize(c, c->x, c->y, c->w, c->h, False);
1649                 showhide(c->snext);
1650         }
1651         else { /* hide clients bottom up */
1652                 showhide(c->snext);
1653                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1654         }
1655 }
1656
1657 void
1658 sigchld(int unused) {
1659         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1660                 die("Can't install SIGCHLD handler");
1661         while(0 < waitpid(-1, NULL, WNOHANG));
1662 }
1663
1664 void
1665 spawn(const Arg *arg) {
1666         if(fork() == 0) {
1667                 if(dpy)
1668                         close(ConnectionNumber(dpy));
1669                 setsid();
1670                 execvp(((char **)arg->v)[0], (char **)arg->v);
1671                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1672                 perror(" failed");
1673                 exit(EXIT_SUCCESS);
1674         }
1675 }
1676
1677 void
1678 tag(const Arg *arg) {
1679         if(selmon->sel && arg->ui & TAGMASK) {
1680                 selmon->sel->tags = arg->ui & TAGMASK;
1681                 focus(NULL);
1682                 arrange(selmon);
1683         }
1684 }
1685
1686 void
1687 tagmon(const Arg *arg) {
1688         if(!selmon->sel || !mons->next)
1689                 return;
1690         sendmon(selmon->sel, dirtomon(arg->i));
1691 }
1692
1693 int
1694 textnw(const char *text, unsigned int len) {
1695         XRectangle r;
1696
1697         if(dc.font.set) {
1698                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1699                 return r.width;
1700         }
1701         return XTextWidth(dc.font.xfont, text, len);
1702 }
1703
1704 void
1705 tile(Monitor *m) {
1706         unsigned int i, n, h, mw, my, ty;
1707         Client *c;
1708
1709         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1710         if(n == 0)
1711                 return;
1712
1713         if(n > m->nmaster)
1714                 mw = m->nmaster ? m->ww * m->mfact : 0;
1715         else
1716                 mw = m->ww;
1717         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1718                 if(i < m->nmaster) {
1719                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1720                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1721                         my += HEIGHT(c);
1722                 }
1723                 else {
1724                         h = (m->wh - ty) / (n - i);
1725                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1726                         ty += HEIGHT(c);
1727                 }
1728 }
1729
1730 void
1731 togglebar(const Arg *arg) {
1732         selmon->showbar = !selmon->showbar;
1733         updatebarpos(selmon);
1734         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1735         arrange(selmon);
1736 }
1737
1738 void
1739 togglefloating(const Arg *arg) {
1740         if(!selmon->sel)
1741                 return;
1742         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1743         if(selmon->sel->isfloating)
1744                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1745                        selmon->sel->w, selmon->sel->h, False);
1746         arrange(selmon);
1747 }
1748
1749 void
1750 toggletag(const Arg *arg) {
1751         unsigned int newtags;
1752
1753         if(!selmon->sel)
1754                 return;
1755         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1756         if(newtags) {
1757                 selmon->sel->tags = newtags;
1758                 focus(NULL);
1759                 arrange(selmon);
1760         }
1761 }
1762
1763 void
1764 toggleview(const Arg *arg) {
1765         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1766
1767         if(newtagset) {
1768                 selmon->tagset[selmon->seltags] = newtagset;
1769                 focus(NULL);
1770                 arrange(selmon);
1771         }
1772 }
1773
1774 void
1775 unfocus(Client *c, Bool setfocus) {
1776         if(!c)
1777                 return;
1778         grabbuttons(c, False);
1779         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1780         if(setfocus)
1781                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1782 }
1783
1784 void
1785 unmanage(Client *c, Bool destroyed) {
1786         Monitor *m = c->mon;
1787         XWindowChanges wc;
1788
1789         /* The server grab construct avoids race conditions. */
1790         detach(c);
1791         detachstack(c);
1792         if(!destroyed) {
1793                 wc.border_width = c->oldbw;
1794                 XGrabServer(dpy);
1795                 XSetErrorHandler(xerrordummy);
1796                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1797                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1798                 setclientstate(c, WithdrawnState);
1799                 XSync(dpy, False);
1800                 XSetErrorHandler(xerror);
1801                 XUngrabServer(dpy);
1802         }
1803         free(c);
1804         focus(NULL);
1805         arrange(m);
1806 }
1807
1808 void
1809 unmapnotify(XEvent *e) {
1810         Client *c;
1811         XUnmapEvent *ev = &e->xunmap;
1812
1813         if((c = wintoclient(ev->window))) {
1814                 if(ev->send_event)
1815                         setclientstate(c, WithdrawnState);
1816                 else
1817                         unmanage(c, False);
1818         }
1819 }
1820
1821 void
1822 updatebars(void) {
1823         Monitor *m;
1824         XSetWindowAttributes wa = {
1825                 .override_redirect = True,
1826                 .background_pixmap = ParentRelative,
1827                 .event_mask = ButtonPressMask|ExposureMask
1828         };
1829         for(m = mons; m; m = m->next) {
1830                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1831                                           CopyFromParent, DefaultVisual(dpy, screen),
1832                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1833                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1834                 XMapRaised(dpy, m->barwin);
1835         }
1836 }
1837
1838 void
1839 updatebarpos(Monitor *m) {
1840         m->wy = m->my;
1841         m->wh = m->mh;
1842         if(m->showbar) {
1843                 m->wh -= bh;
1844                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1845                 m->wy = m->topbar ? m->wy + bh : m->wy;
1846         }
1847         else
1848                 m->by = -bh;
1849 }
1850
1851 Bool
1852 updategeom(void) {
1853         Bool dirty = False;
1854
1855 #ifdef XINERAMA
1856         if(XineramaIsActive(dpy)) {
1857                 int i, j, n, nn;
1858                 Client *c;
1859                 Monitor *m;
1860                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1861                 XineramaScreenInfo *unique = NULL;
1862
1863                 for(n = 0, m = mons; m; m = m->next, n++);
1864                 /* only consider unique geometries as separate screens */
1865                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1866                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1867                 for(i = 0, j = 0; i < nn; i++)
1868                         if(isuniquegeom(unique, j, &info[i]))
1869                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1870                 XFree(info);
1871                 nn = j;
1872                 if(n <= nn) {
1873                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1874                                 for(m = mons; m && m->next; m = m->next);
1875                                 if(m)
1876                                         m->next = createmon();
1877                                 else
1878                                         mons = createmon();
1879                         }
1880                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1881                                 if(i >= n
1882                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1883                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1884                                 {
1885                                         dirty = True;
1886                                         m->num = i;
1887                                         m->mx = m->wx = unique[i].x_org;
1888                                         m->my = m->wy = unique[i].y_org;
1889                                         m->mw = m->ww = unique[i].width;
1890                                         m->mh = m->wh = unique[i].height;
1891                                         updatebarpos(m);
1892                                 }
1893                 }
1894                 else { /* less monitors available nn < n */
1895                         for(i = nn; i < n; i++) {
1896                                 for(m = mons; m && m->next; m = m->next);
1897                                 while(m->clients) {
1898                                         dirty = True;
1899                                         c = m->clients;
1900                                         m->clients = c->next;
1901                                         detachstack(c);
1902                                         c->mon = mons;
1903                                         attach(c);
1904                                         attachstack(c);
1905                                 }
1906                                 if(m == selmon)
1907                                         selmon = mons;
1908                                 cleanupmon(m);
1909                         }
1910                 }
1911                 free(unique);
1912         }
1913         else
1914 #endif /* XINERAMA */
1915         /* default monitor setup */
1916         {
1917                 if(!mons)
1918                         mons = createmon();
1919                 if(mons->mw != sw || mons->mh != sh) {
1920                         dirty = True;
1921                         mons->mw = mons->ww = sw;
1922                         mons->mh = mons->wh = sh;
1923                         updatebarpos(mons);
1924                 }
1925         }
1926         if(dirty) {
1927                 selmon = mons;
1928                 selmon = wintomon(root);
1929         }
1930         return dirty;
1931 }
1932
1933 void
1934 updatenumlockmask(void) {
1935         unsigned int i, j;
1936         XModifierKeymap *modmap;
1937
1938         numlockmask = 0;
1939         modmap = XGetModifierMapping(dpy);
1940         for(i = 0; i < 8; i++)
1941                 for(j = 0; j < modmap->max_keypermod; j++)
1942                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1943                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1944                                 numlockmask = (1 << i);
1945         XFreeModifiermap(modmap);
1946 }
1947
1948 void
1949 updatesizehints(Client *c) {
1950         long msize;
1951         XSizeHints size;
1952
1953         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1954                 /* size is uninitialized, ensure that size.flags aren't used */
1955                 size.flags = PSize;
1956         if(size.flags & PBaseSize) {
1957                 c->basew = size.base_width;
1958                 c->baseh = size.base_height;
1959         }
1960         else if(size.flags & PMinSize) {
1961                 c->basew = size.min_width;
1962                 c->baseh = size.min_height;
1963         }
1964         else
1965                 c->basew = c->baseh = 0;
1966         if(size.flags & PResizeInc) {
1967                 c->incw = size.width_inc;
1968                 c->inch = size.height_inc;
1969         }
1970         else
1971                 c->incw = c->inch = 0;
1972         if(size.flags & PMaxSize) {
1973                 c->maxw = size.max_width;
1974                 c->maxh = size.max_height;
1975         }
1976         else
1977                 c->maxw = c->maxh = 0;
1978         if(size.flags & PMinSize) {
1979                 c->minw = size.min_width;
1980                 c->minh = size.min_height;
1981         }
1982         else if(size.flags & PBaseSize) {
1983                 c->minw = size.base_width;
1984                 c->minh = size.base_height;
1985         }
1986         else
1987                 c->minw = c->minh = 0;
1988         if(size.flags & PAspect) {
1989                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
1990                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
1991         }
1992         else
1993                 c->maxa = c->mina = 0.0;
1994         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1995                      && c->maxw == c->minw && c->maxh == c->minh);
1996 }
1997
1998 void
1999 updatetitle(Client *c) {
2000         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2001                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2002         if(c->name[0] == '\0') /* hack to mark broken clients */
2003                 strcpy(c->name, broken);
2004 }
2005
2006 void
2007 updatestatus(void) {
2008         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2009                 strcpy(stext, "dwm-"VERSION);
2010         drawbar(selmon);
2011 }
2012
2013 void
2014 updatewindowtype(Client *c) {
2015         Atom state = getatomprop(c, netatom[NetWMState]);
2016         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2017
2018         if(state == netatom[NetWMFullscreen])
2019                 setfullscreen(c, True);
2020
2021         if(wtype == netatom[NetWMWindowTypeDialog])
2022                 c->isfloating = True;
2023 }
2024
2025 void
2026 updatewmhints(Client *c) {
2027         XWMHints *wmh;
2028
2029         if((wmh = XGetWMHints(dpy, c->win))) {
2030                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2031                         wmh->flags &= ~XUrgencyHint;
2032                         XSetWMHints(dpy, c->win, wmh);
2033                 }
2034                 else
2035                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2036                 if(wmh->flags & InputHint)
2037                         c->neverfocus = !wmh->input;
2038                 else
2039                         c->neverfocus = False;
2040                 XFree(wmh);
2041         }
2042 }
2043
2044 void
2045 view(const Arg *arg) {
2046         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2047                 return;
2048         selmon->seltags ^= 1; /* toggle sel tagset */
2049         if(arg->ui & TAGMASK)
2050                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2051         focus(NULL);
2052         arrange(selmon);
2053 }
2054
2055 Client *
2056 wintoclient(Window w) {
2057         Client *c;
2058         Monitor *m;
2059
2060         for(m = mons; m; m = m->next)
2061                 for(c = m->clients; c; c = c->next)
2062                         if(c->win == w)
2063                                 return c;
2064         return NULL;
2065 }
2066
2067 Monitor *
2068 wintomon(Window w) {
2069         int x, y;
2070         Client *c;
2071         Monitor *m;
2072
2073         if(w == root && getrootptr(&x, &y))
2074                 return recttomon(x, y, 1, 1);
2075         for(m = mons; m; m = m->next)
2076                 if(w == m->barwin)
2077                         return m;
2078         if((c = wintoclient(w)))
2079                 return c->mon;
2080         return selmon;
2081 }
2082
2083 /* There's no way to check accesses to destroyed windows, thus those cases are
2084  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2085  * default error handler, which may call exit.  */
2086 int
2087 xerror(Display *dpy, XErrorEvent *ee) {
2088         if(ee->error_code == BadWindow
2089         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2090         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2091         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2092         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2093         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2094         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2095         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2096         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2097                 return 0;
2098         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2099                         ee->request_code, ee->error_code);
2100         return xerrorxlib(dpy, ee); /* may call exit */
2101 }
2102
2103 int
2104 xerrordummy(Display *dpy, XErrorEvent *ee) {
2105         return 0;
2106 }
2107
2108 /* Startup Error handler to check if another window manager
2109  * is already running. */
2110 int
2111 xerrorstart(Display *dpy, XErrorEvent *ee) {
2112         die("dwm: another window manager is already running\n");
2113         return -1;
2114 }
2115
2116 void
2117 zoom(const Arg *arg) {
2118         Client *c = selmon->sel;
2119
2120         if(!selmon->lt[selmon->sellt]->arrange
2121         || (selmon->sel && selmon->sel->isfloating))
2122                 return;
2123         if(c == nexttiled(selmon->clients))
2124                 if(!c || !(c = nexttiled(c->next)))
2125                         return;
2126         pop(c);
2127 }
2128
2129 int
2130 main(int argc, char *argv[]) {
2131         if(argc == 2 && !strcmp("-v", argv[1]))
2132                 die("dwm-"VERSION", © 2006-2011 dwm engineers, see LICENSE for details\n");
2133         else if(argc != 1)
2134                 die("usage: dwm [-v]\n");
2135         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2136                 fputs("warning: no locale support\n", stderr);
2137         if(!(dpy = XOpenDisplay(NULL)))
2138                 die("dwm: cannot open display\n");
2139         checkotherwm();
2140         setup();
2141         scan();
2142         run();
2143         cleanup();
2144         XCloseDisplay(dpy);
2145         return EXIT_SUCCESS;
2146 }