dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49 #define LENGTH(X)               (sizeof X / sizeof X[0])
  50 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58 /* enums */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetWMState,
  62        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  64 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68 typedef union {
  69         int i;
  70         unsigned int ui;
  71         float f;
  72         const void *v;
  73 } Arg;
  74
  75 typedef struct {
  76         unsigned int click;
  77         unsigned int mask;
  78         unsigned int button;
  79         void (*func)(const Arg *arg);
  80         const Arg arg;
  81 } Button;
  82
  83 typedef struct Monitor Monitor;
  84 typedef struct Client Client;
  85 struct Client {
  86         char name[256];
  87         float mina, maxa;
  88         int x, y, w, h;
  89         int oldx, oldy, oldw, oldh;
  90         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91         int bw, oldbw;
  92         unsigned int tags;
  93         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94         Client *next;
  95         Client *snext;
  96         Monitor *mon;
  97         Window win;
  98 };
  99
 100 typedef struct {
 101         int x, y, w, h;
 102         unsigned long norm[ColLast];
 103         unsigned long sel[ColLast];
 104         Drawable drawable;
 105         GC gc;
 106         struct {
 107                 int ascent;
 108                 int descent;
 109                 int height;
 110                 XFontSet set;
 111                 XFontStruct *xfont;
 112         } font;
 113 } DC; /* draw context */
 114
 115 typedef struct {
 116         unsigned int mod;
 117         KeySym keysym;
 118         void (*func)(const Arg *);
 119         const Arg arg;
 120 } Key;
 121
 122 typedef struct {
 123         const char *symbol;
 124         void (*arrange)(Monitor *);
 125 } Layout;
 126
 127 struct Monitor {
 128         char ltsymbol[16];
 129         float mfact;
 130         int nmaster;
 131         int num;
 132         int by;               /* bar geometry */
 133         int mx, my, mw, mh;   /* screen size */
 134         int wx, wy, ww, wh;   /* window area  */
 135         unsigned int seltags;
 136         unsigned int sellt;
 137         unsigned int tagset[2];
 138         Bool showbar;
 139         Bool topbar;
 140         Client *clients;
 141         Client *sel;
 142         Client *stack;
 143         Monitor *next;
 144         Window barwin;
 145         const Layout *lt[2];
 146 };
 147
 148 typedef struct {
 149         const char *class;
 150         const char *instance;
 151         const char *title;
 152         unsigned int tags;
 153         Bool isfloating;
 154         int monitor;
 155 } Rule;
 156
 157 /* function declarations */
 158 static void applyrules(Client *c);
 159 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160 static void arrange(Monitor *m);
 161 static void arrangemon(Monitor *m);
 162 static void attach(Client *c);
 163 static void attachstack(Client *c);
 164 static void buttonpress(XEvent *e);
 165 static void checkotherwm(void);
 166 static void cleanup(void);
 167 static void cleanupmon(Monitor *mon);
 168 static void clearurgent(Client *c);
 169 static void clientmessage(XEvent *e);
 170 static void configure(Client *c);
 171 static void configurenotify(XEvent *e);
 172 static void configurerequest(XEvent *e);
 173 static Monitor *createmon(void);
 174 static void destroynotify(XEvent *e);
 175 static void detach(Client *c);
 176 static void detachstack(Client *c);
 177 static void die(const char *errstr, ...);
 178 static Monitor *dirtomon(int dir);
 179 static void drawbar(Monitor *m);
 180 static void drawbars(void);
 181 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183 static void enternotify(XEvent *e);
 184 static void expose(XEvent *e);
 185 static void focus(Client *c);
 186 static void focusin(XEvent *e);
 187 static void focusmon(const Arg *arg);
 188 static void focusstack(const Arg *arg);
 189 static unsigned long getcolor(const char *colstr);
 190 static Bool getrootptr(int *x, int *y);
 191 static long getstate(Window w);
 192 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193 static void grabbuttons(Client *c, Bool focused);
 194 static void grabkeys(void);
 195 static void incnmaster(const Arg *arg);
 196 static void initfont(const char *fontstr);
 197 static void keypress(XEvent *e);
 198 static void killclient(const Arg *arg);
 199 static void manage(Window w, XWindowAttributes *wa);
 200 static void mappingnotify(XEvent *e);
 201 static void maprequest(XEvent *e);
 202 static void monocle(Monitor *m);
 203 static void motionnotify(XEvent *e);
 204 static void movemouse(const Arg *arg);
 205 static Client *nexttiled(Client *c);
 206 static void pop(Client *);
 207 static void propertynotify(XEvent *e);
 208 static void quit(const Arg *arg);
 209 static Monitor *recttomon(int x, int y, int w, int h);
 210 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 211 static void resizeclient(Client *c, int x, int y, int w, int h);
 212 static void resizemouse(const Arg *arg);
 213 static void restack(Monitor *m);
 214 static void run(void);
 215 static void scan(void);
 216 static Bool sendevent(Client *c, Atom proto);
 217 static void sendmon(Client *c, Monitor *m);
 218 static void setclientstate(Client *c, long state);
 219 static void setfocus(Client *c);
 220 static void setfullscreen(Client *c, Bool fullscreen);
 221 static void setlayout(const Arg *arg);
 222 static void setmfact(const Arg *arg);
 223 static void setup(void);
 224 static void showhide(Client *c);
 225 static void sigchld(int unused);
 226 static void spawn(const Arg *arg);
 227 static void tag(const Arg *arg);
 228 static void tagmon(const Arg *arg);
 229 static int textnw(const char *text, unsigned int len);
 230 static void tile(Monitor *);
 231 static void togglebar(const Arg *arg);
 232 static void togglefloating(const Arg *arg);
 233 static void toggletag(const Arg *arg);
 234 static void toggleview(const Arg *arg);
 235 static void unfocus(Client *c, Bool setfocus);
 236 static void unmanage(Client *c, Bool destroyed);
 237 static void unmapnotify(XEvent *e);
 238 static void updategeom(void);
 239 static void updatebarpos(Monitor *m);
 240 static void updatebars(void);
 241 static void updateclientlist(void);
 242 static void updatenumlockmask(void);
 243 static void updatesizehints(Client *c);
 244 static void updatestatus(void);
 245 static void updatewindowtype(Client *c);
 246 static void updatetitle(Client *c);
 247 static void updatewmhints(Client *c);
 248 static void view(const Arg *arg);
 249 static Client *wintoclient(Window w);
 250 static Monitor *wintomon(Window w);
 251 static int xerror(Display *dpy, XErrorEvent *ee);
 252 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 253 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 254 static void zoom(const Arg *arg);
 255
 256 /* variables */
 257 static const char broken[] = "broken";
 258 static char stext[256];
 259 static int screen;
 260 static int sw, sh;           /* X display screen geometry width, height */
 261 static int bh, blw = 0;      /* bar geometry */
 262 static int (*xerrorxlib)(Display *, XErrorEvent *);
 263 static unsigned int numlockmask = 0;
 264 static void (*handler[LASTEvent]) (XEvent *) = {
 265         [ButtonPress] = buttonpress,
 266         [ClientMessage] = clientmessage,
 267         [ConfigureRequest] = configurerequest,
 268         [ConfigureNotify] = configurenotify,
 269         [DestroyNotify] = destroynotify,
 270         [EnterNotify] = enternotify,
 271         [Expose] = expose,
 272         [FocusIn] = focusin,
 273         [KeyPress] = keypress,
 274         [MappingNotify] = mappingnotify,
 275         [MapRequest] = maprequest,
 276         [MotionNotify] = motionnotify,
 277         [PropertyNotify] = propertynotify,
 278         [UnmapNotify] = unmapnotify
 279 };
 280 static Atom wmatom[WMLast], netatom[NetLast];
 281 static Bool running = True;
 282 static Cursor cursor[CurLast];
 283 static Display *dpy;
 284 static DC dc;
 285 static Monitor *mons = NULL, *selmon = NULL;
 286 static Window root;
 287
 288 /* configuration, allows nested code to access above variables */
 289 #include "config.h"
 290
 291 /* compile-time check if all tags fit into an unsigned int bit array. */
 292 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 293
 294 /* function implementations */
 295 void
 296 applyrules(Client *c) {
 297         const char *class, *instance;
 298         unsigned int i;
 299         const Rule *r;
 300         Monitor *m;
 301         XClassHint ch = { NULL, NULL };
 302
 303         /* rule matching */
 304         c->isfloating = c->tags = 0;
 305         XGetClassHint(dpy, c->win, &ch);
 306         class    = ch.res_class ? ch.res_class : broken;
 307         instance = ch.res_name  ? ch.res_name  : broken;
 308
 309         for(i = 0; i < LENGTH(rules); i++) {
 310                 r = &rules[i];
 311                 if((!r->title || strstr(c->name, r->title))
 312                 && (!r->class || strstr(class, r->class))
 313                 && (!r->instance || strstr(instance, r->instance)))
 314                 {
 315                         c->isfloating = r->isfloating;
 316                         c->tags |= r->tags;
 317                         for(m = mons; m && m->num != r->monitor; m = m->next);
 318                         if(m)
 319                                 c->mon = m;
 320                 }
 321         }
 322         if(ch.res_class)
 323                 XFree(ch.res_class);
 324         if(ch.res_name)
 325                 XFree(ch.res_name);
 326         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 327 }
 328
 329 Bool
 330 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 331         Bool baseismin;
 332         Monitor *m = c->mon;
 333
 334         /* set minimum possible */
 335         *w = MAX(1, *w);
 336         *h = MAX(1, *h);
 337         if(interact) {
 338                 if(*x > sw)
 339                         *x = sw - WIDTH(c);
 340                 if(*y > sh)
 341                         *y = sh - HEIGHT(c);
 342                 if(*x + *w + 2 * c->bw < 0)
 343                         *x = 0;
 344                 if(*y + *h + 2 * c->bw < 0)
 345                         *y = 0;
 346         }
 347         else {
 348                 if(*x >= m->wx + m->ww)
 349                         *x = m->wx + m->ww - WIDTH(c);
 350                 if(*y >= m->wy + m->wh)
 351                         *y = m->wy + m->wh - HEIGHT(c);
 352                 if(*x + *w + 2 * c->bw <= m->wx)
 353                         *x = m->wx;
 354                 if(*y + *h + 2 * c->bw <= m->wy)
 355                         *y = m->wy;
 356         }
 357         if(*h < bh)
 358                 *h = bh;
 359         if(*w < bh)
 360                 *w = bh;
 361         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 362                 /* see last two sentences in ICCCM 4.1.2.3 */
 363                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 364                 if(!baseismin) { /* temporarily remove base dimensions */
 365                         *w -= c->basew;
 366                         *h -= c->baseh;
 367                 }
 368                 /* adjust for aspect limits */
 369                 if(c->mina > 0 && c->maxa > 0) {
 370                         if(c->maxa < (float)*w / *h)
 371                                 *w = *h * c->maxa + 0.5;
 372                         else if(c->mina < (float)*h / *w)
 373                                 *h = *w * c->mina + 0.5;
 374                 }
 375                 if(baseismin) { /* increment calculation requires this */
 376                         *w -= c->basew;
 377                         *h -= c->baseh;
 378                 }
 379                 /* adjust for increment value */
 380                 if(c->incw)
 381                         *w -= *w % c->incw;
 382                 if(c->inch)
 383                         *h -= *h % c->inch;
 384                 /* restore base dimensions */
 385                 *w = MAX(*w + c->basew, c->minw);
 386                 *h = MAX(*h + c->baseh, c->minh);
 387                 if(c->maxw)
 388                         *w = MIN(*w, c->maxw);
 389                 if(c->maxh)
 390                         *h = MIN(*h, c->maxh);
 391         }
 392         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 393 }
 394
 395 void
 396 arrange(Monitor *m) {
 397         if(m)
 398                 showhide(m->stack);
 399         else for(m = mons; m; m = m->next)
 400                 showhide(m->stack);
 401         if(m) {
 402                 arrangemon(m);
 403                 restack(m);
 404         } else for(m = mons; m; m = m->next)
 405                 arrangemon(m);
 406 }
 407
 408 void
 409 arrangemon(Monitor *m) {
 410         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 411         if(m->lt[m->sellt]->arrange)
 412                 m->lt[m->sellt]->arrange(m);
 413 }
 414
 415 void
 416 attach(Client *c) {
 417         c->next = c->mon->clients;
 418         c->mon->clients = c;
 419 }
 420
 421 void
 422 attachstack(Client *c) {
 423         c->snext = c->mon->stack;
 424         c->mon->stack = c;
 425 }
 426
 427 void
 428 buttonpress(XEvent *e) {
 429         unsigned int i, x, click;
 430         Arg arg = {0};
 431         Client *c;
 432         Monitor *m;
 433         XButtonPressedEvent *ev = &e->xbutton;
 434
 435         click = ClkRootWin;
 436         /* focus monitor if necessary */
 437         if((m = wintomon(ev->window)) && m != selmon) {
 438                 unfocus(selmon->sel, True);
 439                 selmon = m;
 440                 focus(NULL);
 441         }
 442         if(ev->window == selmon->barwin) {
 443                 i = x = 0;
 444                 do
 445                         x += TEXTW(tags[i]);
 446                 while(ev->x >= x && ++i < LENGTH(tags));
 447                 if(i < LENGTH(tags)) {
 448                         click = ClkTagBar;
 449                         arg.ui = 1 << i;
 450                 }
 451                 else if(ev->x < x + blw)
 452                         click = ClkLtSymbol;
 453                 else if(ev->x > selmon->ww - TEXTW(stext))
 454                         click = ClkStatusText;
 455                 else
 456                         click = ClkWinTitle;
 457         }
 458         else if((c = wintoclient(ev->window))) {
 459                 focus(c);
 460                 click = ClkClientWin;
 461         }
 462         for(i = 0; i < LENGTH(buttons); i++)
 463                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 464                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 465                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 466 }
 467
 468 void
 469 checkotherwm(void) {
 470         xerrorxlib = XSetErrorHandler(xerrorstart);
 471         /* this causes an error if some other window manager is running */
 472         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 473         XSync(dpy, False);
 474         XSetErrorHandler(xerror);
 475         XSync(dpy, False);
 476 }
 477
 478 void
 479 cleanup(void) {
 480         Arg a = {.ui = ~0};
 481         Layout foo = { "", NULL };
 482         Monitor *m;
 483
 484         view(&a);
 485         selmon->lt[selmon->sellt] = &foo;
 486         for(m = mons; m; m = m->next)
 487                 while(m->stack)
 488                         unmanage(m->stack, False);
 489         if(dc.font.set)
 490                 XFreeFontSet(dpy, dc.font.set);
 491         else
 492                 XFreeFont(dpy, dc.font.xfont);
 493         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 494         XFreePixmap(dpy, dc.drawable);
 495         XFreeGC(dpy, dc.gc);
 496         XFreeCursor(dpy, cursor[CurNormal]);
 497         XFreeCursor(dpy, cursor[CurResize]);
 498         XFreeCursor(dpy, cursor[CurMove]);
 499         while(mons)
 500                 cleanupmon(mons);
 501         XSync(dpy, False);
 502         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 503         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 504 }
 505
 506 void
 507 cleanupmon(Monitor *mon) {
 508         Monitor *m;
 509
 510         if(mon == mons)
 511                 mons = mons->next;
 512         else {
 513                 for(m = mons; m && m->next != mon; m = m->next);
 514                 m->next = mon->next;
 515         }
 516         XUnmapWindow(dpy, mon->barwin);
 517         XDestroyWindow(dpy, mon->barwin);
 518         free(mon);
 519 }
 520
 521 void
 522 clearurgent(Client *c) {
 523         XWMHints *wmh;
 524
 525         c->isurgent = False;
 526         if(!(wmh = XGetWMHints(dpy, c->win)))
 527                 return;
 528         wmh->flags &= ~XUrgencyHint;
 529         XSetWMHints(dpy, c->win, wmh);
 530         XFree(wmh);
 531 }
 532
 533 void
 534 clientmessage(XEvent *e) {
 535         XClientMessageEvent *cme = &e->xclient;
 536         Client *c = wintoclient(cme->window);
 537
 538         if(!c)
 539                 return;
 540         if(cme->message_type == netatom[NetWMState]) {
 541                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 542                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 543                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 544         }
 545         else if(cme->message_type == netatom[NetActiveWindow]) {
 546                 if(!ISVISIBLE(c)) {
 547                         c->mon->seltags ^= 1;
 548                         c->mon->tagset[c->mon->seltags] = c->tags;
 549                 }
 550                 pop(c);
 551         }
 552 }
 553
 554 void
 555 configure(Client *c) {
 556         XConfigureEvent ce;
 557
 558         ce.type = ConfigureNotify;
 559         ce.display = dpy;
 560         ce.event = c->win;
 561         ce.window = c->win;
 562         ce.x = c->x;
 563         ce.y = c->y;
 564         ce.width = c->w;
 565         ce.height = c->h;
 566         ce.border_width = c->bw;
 567         ce.above = None;
 568         ce.override_redirect = False;
 569         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 570 }
 571
 572 void
 573 configurenotify(XEvent *e) {
 574         Monitor *m;
 575         XConfigureEvent *ev = &e->xconfigure;
 576
 577         if(ev->window == root) {
 578                 sw = ev->width;
 579                 sh = ev->height;
 580                 if(dc.drawable != 0)
 581                         XFreePixmap(dpy, dc.drawable);
 582                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 583                 updatebars();
 584                 for(m = mons; m; m = m->next)
 585                         XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 586                 focus(NULL);
 587                 arrange(NULL);
 588         }
 589 }
 590
 591 void
 592 configurerequest(XEvent *e) {
 593         Client *c;
 594         Monitor *m;
 595         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 596         XWindowChanges wc;
 597
 598         if((c = wintoclient(ev->window))) {
 599                 if(ev->value_mask & CWBorderWidth)
 600                         c->bw = ev->border_width;
 601                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 602                         m = c->mon;
 603                         if(ev->value_mask & CWX) {
 604                                 c->oldx = c->x;
 605                                 c->x = m->mx + ev->x;
 606                         }
 607                         if(ev->value_mask & CWY) {
 608                                 c->oldy = c->y;
 609                                 c->y = m->my + ev->y;
 610                         }
 611                         if(ev->value_mask & CWWidth) {
 612                                 c->oldw = c->w;
 613                                 c->w = ev->width;
 614                         }
 615                         if(ev->value_mask & CWHeight) {
 616                                 c->oldh = c->h;
 617                                 c->h = ev->height;
 618                         }
 619                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 620                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 621                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 622                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 623                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 624                                 configure(c);
 625                         if(ISVISIBLE(c))
 626                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 627                 }
 628                 else
 629                         configure(c);
 630         }
 631         else {
 632                 wc.x = ev->x;
 633                 wc.y = ev->y;
 634                 wc.width = ev->width;
 635                 wc.height = ev->height;
 636                 wc.border_width = ev->border_width;
 637                 wc.sibling = ev->above;
 638                 wc.stack_mode = ev->detail;
 639                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 640         }
 641         XSync(dpy, False);
 642 }
 643
 644 Monitor *
 645 createmon(void) {
 646         Monitor *m;
 647
 648         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 649                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 650         m->tagset[0] = m->tagset[1] = 1;
 651         m->mfact = mfact;
 652         m->nmaster = nmaster;
 653         m->showbar = showbar;
 654         m->topbar = topbar;
 655         m->lt[0] = &layouts[0];
 656         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 657         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 658         return m;
 659 }
 660
 661 void
 662 destroynotify(XEvent *e) {
 663         Client *c;
 664         XDestroyWindowEvent *ev = &e->xdestroywindow;
 665
 666         if((c = wintoclient(ev->window)))
 667                 unmanage(c, True);
 668 }
 669
 670 void
 671 detach(Client *c) {
 672         Client **tc;
 673
 674         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 675         *tc = c->next;
 676 }
 677
 678 void
 679 detachstack(Client *c) {
 680         Client **tc, *t;
 681
 682         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 683         *tc = c->snext;
 684
 685         if(c == c->mon->sel) {
 686                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 687                 c->mon->sel = t;
 688         }
 689 }
 690
 691 void
 692 die(const char *errstr, ...) {
 693         va_list ap;
 694
 695         va_start(ap, errstr);
 696         vfprintf(stderr, errstr, ap);
 697         va_end(ap);
 698         exit(EXIT_FAILURE);
 699 }
 700
 701 Monitor *
 702 dirtomon(int dir) {
 703         Monitor *m = NULL;
 704
 705         if(dir > 0) {
 706                 if(!(m = selmon->next))
 707                         m = mons;
 708         }
 709         else if(selmon == mons)
 710                 for(m = mons; m->next; m = m->next);
 711         else
 712                 for(m = mons; m->next != selmon; m = m->next);
 713         return m;
 714 }
 715
 716 void
 717 drawbar(Monitor *m) {
 718         int x;
 719         unsigned int i, occ = 0, urg = 0;
 720         unsigned long *col;
 721         Client *c;
 722
 723         for(c = m->clients; c; c = c->next) {
 724                 occ |= c->tags;
 725                 if(c->isurgent)
 726                         urg |= c->tags;
 727         }
 728         dc.x = 0;
 729         for(i = 0; i < LENGTH(tags); i++) {
 730                 dc.w = TEXTW(tags[i]);
 731                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 732                 drawtext(tags[i], col, urg & 1 << i);
 733                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 734                            occ & 1 << i, urg & 1 << i, col);
 735                 dc.x += dc.w;
 736         }
 737         dc.w = blw = TEXTW(m->ltsymbol);
 738         drawtext(m->ltsymbol, dc.norm, False);
 739         dc.x += dc.w;
 740         x = dc.x;
 741         if(m == selmon) { /* status is only drawn on selected monitor */
 742                 dc.w = TEXTW(stext);
 743                 dc.x = m->ww - dc.w;
 744                 if(dc.x < x) {
 745                         dc.x = x;
 746                         dc.w = m->ww - x;
 747                 }
 748                 drawtext(stext, dc.norm, False);
 749         }
 750         else
 751                 dc.x = m->ww;
 752         if((dc.w = dc.x - x) > bh) {
 753                 dc.x = x;
 754                 if(m->sel) {
 755                         col = m == selmon ? dc.sel : dc.norm;
 756                         drawtext(m->sel->name, col, False);
 757                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 758                 }
 759                 else
 760                         drawtext(NULL, dc.norm, False);
 761         }
 762         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 763         XSync(dpy, False);
 764 }
 765
 766 void
 767 drawbars(void) {
 768         Monitor *m;
 769
 770         for(m = mons; m; m = m->next)
 771                 drawbar(m);
 772 }
 773
 774 void
 775 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 776         int x;
 777
 778         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 779         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 780         if(filled)
 781                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 782         else if(empty)
 783                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 784 }
 785
 786 void
 787 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 788         char buf[256];
 789         int i, x, y, h, len, olen;
 790
 791         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 792         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 793         if(!text)
 794                 return;
 795         olen = strlen(text);
 796         h = dc.font.ascent + dc.font.descent;
 797         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 798         x = dc.x + (h / 2);
 799         /* shorten text if necessary */
 800         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 801         if(!len)
 802                 return;
 803         memcpy(buf, text, len);
 804         if(len < olen)
 805                 for(i = len; i && i > len - 3; buf[--i] = '.');
 806         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 807         if(dc.font.set)
 808                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 809         else
 810                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 811 }
 812
 813 void
 814 enternotify(XEvent *e) {
 815         Client *c;
 816         Monitor *m;
 817         XCrossingEvent *ev = &e->xcrossing;
 818
 819         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 820                 return;
 821         c = wintoclient(ev->window);
 822         m = c ? c->mon : wintomon(ev->window);
 823         if(m != selmon) {
 824                 unfocus(selmon->sel, True);
 825                 selmon = m;
 826         }
 827         else if(!c || c == selmon->sel)
 828                 return;
 829         focus(c);
 830 }
 831
 832 void
 833 expose(XEvent *e) {
 834         Monitor *m;
 835         XExposeEvent *ev = &e->xexpose;
 836
 837         if(ev->count == 0 && (m = wintomon(ev->window)))
 838                 drawbar(m);
 839 }
 840
 841 void
 842 focus(Client *c) {
 843         if(!c || !ISVISIBLE(c))
 844                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 845         /* was if(selmon->sel) */
 846         if(selmon->sel && selmon->sel != c)
 847                 unfocus(selmon->sel, False);
 848         if(c) {
 849                 if(c->mon != selmon)
 850                         selmon = c->mon;
 851                 if(c->isurgent)
 852                         clearurgent(c);
 853                 detachstack(c);
 854                 attachstack(c);
 855                 grabbuttons(c, True);
 856                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 857                 setfocus(c);
 858         }
 859         else {
 860                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 861                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 862         }
 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, False); /* s/True/False/ fixes input focus issues
 884                                         in gedit and anjuta */
 885         selmon = m;
 886         focus(NULL);
 887 }
 888
 889 void
 890 focusstack(const Arg *arg) {
 891         Client *c = NULL, *i;
 892
 893         if(!selmon->sel)
 894                 return;
 895         if(arg->i > 0) {
 896                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 897                 if(!c)
 898                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 899         }
 900         else {
 901                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 902                         if(ISVISIBLE(i))
 903                                 c = i;
 904                 if(!c)
 905                         for(; i; i = i->next)
 906                                 if(ISVISIBLE(i))
 907                                         c = i;
 908         }
 909         if(c) {
 910                 focus(c);
 911                 restack(selmon);
 912         }
 913 }
 914
 915 Atom
 916 getatomprop(Client *c, Atom prop) {
 917         int di;
 918         unsigned long dl;
 919         unsigned char *p = NULL;
 920         Atom da, atom = None;
 921
 922         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 923                               &da, &di, &dl, &dl, &p) == Success && p) {
 924                 atom = *(Atom *)p;
 925                 XFree(p);
 926         }
 927         return atom;
 928 }
 929
 930 unsigned long
 931 getcolor(const char *colstr) {
 932         Colormap cmap = DefaultColormap(dpy, screen);
 933         XColor color;
 934
 935         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 936                 die("error, cannot allocate color '%s'\n", colstr);
 937         return color.pixel;
 938 }
 939
 940 Bool
 941 getrootptr(int *x, int *y) {
 942         int di;
 943         unsigned int dui;
 944         Window dummy;
 945
 946         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 947 }
 948
 949 long
 950 getstate(Window w) {
 951         int format;
 952         long result = -1;
 953         unsigned char *p = NULL;
 954         unsigned long n, extra;
 955         Atom real;
 956
 957         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 958                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 959                 return -1;
 960         if(n != 0)
 961                 result = *p;
 962         XFree(p);
 963         return result;
 964 }
 965
 966 Bool
 967 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 968         char **list = NULL;
 969         int n;
 970         XTextProperty name;
 971
 972         if(!text || size == 0)
 973                 return False;
 974         text[0] = '\0';
 975         XGetTextProperty(dpy, w, &name, atom);
 976         if(!name.nitems)
 977                 return False;
 978         if(name.encoding == XA_STRING)
 979                 strncpy(text, (char *)name.value, size - 1);
 980         else {
 981                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 982                         strncpy(text, *list, size - 1);
 983                         XFreeStringList(list);
 984                 }
 985         }
 986         text[size - 1] = '\0';
 987         XFree(name.value);
 988         return True;
 989 }
 990
 991 void
 992 grabbuttons(Client *c, Bool focused) {
 993         updatenumlockmask();
 994         {
 995                 unsigned int i, j;
 996                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 997                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 998                 if(focused) {
 999                         for(i = 0; i < LENGTH(buttons); i++)
1000                                 if(buttons[i].click == ClkClientWin)
1001                                         for(j = 0; j < LENGTH(modifiers); j++)
1002                                                 XGrabButton(dpy, buttons[i].button,
1003                                                             buttons[i].mask | modifiers[j],
1004                                                             c->win, False, BUTTONMASK,
1005                                                             GrabModeAsync, GrabModeSync, None, None);
1006                 }
1007                 else
1008                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1009                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1010         }
1011 }
1012
1013 void
1014 grabkeys(void) {
1015         updatenumlockmask();
1016         {
1017                 unsigned int i, j;
1018                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1019                 KeyCode code;
1020
1021                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1022                 for(i = 0; i < LENGTH(keys); i++)
1023                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1024                                 for(j = 0; j < LENGTH(modifiers); j++)
1025                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1026                                                  True, GrabModeAsync, GrabModeAsync);
1027         }
1028 }
1029
1030 void
1031 incnmaster(const Arg *arg) {
1032         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1033         arrange(selmon);
1034 }
1035
1036 void
1037 initfont(const char *fontstr) {
1038         char *def, **missing;
1039         int n;
1040
1041         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1042         if(missing) {
1043                 while(n--)
1044                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1045                 XFreeStringList(missing);
1046         }
1047         if(dc.font.set) {
1048                 XFontStruct **xfonts;
1049                 char **font_names;
1050
1051                 dc.font.ascent = dc.font.descent = 0;
1052                 XExtentsOfFontSet(dc.font.set);
1053                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1054                 while(n--) {
1055                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1056                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1057                         xfonts++;
1058                 }
1059         }
1060         else {
1061                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1062                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1063                         die("error, cannot load font: '%s'\n", fontstr);
1064                 dc.font.ascent = dc.font.xfont->ascent;
1065                 dc.font.descent = dc.font.xfont->descent;
1066         }
1067         dc.font.height = dc.font.ascent + dc.font.descent;
1068 }
1069
1070 #ifdef XINERAMA
1071 static Bool
1072 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1073         while(n--)
1074                 /* treat origin (x, y) as fixpoint for uniqueness only, first screen wins */
1075                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org)
1076                         return False;
1077         return True;
1078 }
1079 #endif /* XINERAMA */
1080
1081 void
1082 keypress(XEvent *e) {
1083         unsigned int i;
1084         KeySym keysym;
1085         XKeyEvent *ev;
1086
1087         ev = &e->xkey;
1088         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1089         for(i = 0; i < LENGTH(keys); i++)
1090                 if(keysym == keys[i].keysym
1091                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1092                 && keys[i].func)
1093                         keys[i].func(&(keys[i].arg));
1094 }
1095
1096 void
1097 killclient(const Arg *arg) {
1098         if(!selmon->sel)
1099                 return;
1100         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1101                 XGrabServer(dpy);
1102                 XSetErrorHandler(xerrordummy);
1103                 XSetCloseDownMode(dpy, DestroyAll);
1104                 XKillClient(dpy, selmon->sel->win);
1105                 XSync(dpy, False);
1106                 XSetErrorHandler(xerror);
1107                 XUngrabServer(dpy);
1108         }
1109 }
1110
1111 void
1112 manage(Window w, XWindowAttributes *wa) {
1113         Client *c, *t = NULL;
1114         Window trans = None;
1115         XWindowChanges wc;
1116
1117         if(!(c = calloc(1, sizeof(Client))))
1118                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1119         c->win = w;
1120         updatetitle(c);
1121         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1122                 c->mon = t->mon;
1123                 c->tags = t->tags;
1124         }
1125         else {
1126                 c->mon = selmon;
1127                 applyrules(c);
1128         }
1129         /* geometry */
1130         c->x = c->oldx = wa->x;
1131         c->y = c->oldy = wa->y;
1132         c->w = c->oldw = wa->width;
1133         c->h = c->oldh = wa->height;
1134         c->oldbw = wa->border_width;
1135
1136         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1137                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1138         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1139                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1140         c->x = MAX(c->x, c->mon->mx);
1141         /* only fix client y-offset, if the client center might cover the bar */
1142         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1143                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1144         c->bw = borderpx;
1145
1146         wc.border_width = c->bw;
1147         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1148         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1149         configure(c); /* propagates border_width, if size doesn't change */
1150         updatewindowtype(c);
1151         updatesizehints(c);
1152         updatewmhints(c);
1153         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1154         grabbuttons(c, False);
1155         if(!c->isfloating)
1156                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1157         if(c->isfloating)
1158                 XRaiseWindow(dpy, c->win);
1159         attach(c);
1160         attachstack(c);
1161         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1162                         (unsigned char *) &(c->win), 1);
1163         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1164         setclientstate(c, NormalState);
1165         if (c->mon == selmon)
1166                 unfocus(selmon->sel, False);
1167         c->mon->sel = c;
1168         arrange(c->mon);
1169         XMapWindow(dpy, c->win);
1170         focus(NULL);
1171 }
1172
1173 void
1174 mappingnotify(XEvent *e) {
1175         XMappingEvent *ev = &e->xmapping;
1176
1177         XRefreshKeyboardMapping(ev);
1178         if(ev->request == MappingKeyboard)
1179                 grabkeys();
1180 }
1181
1182 void
1183 maprequest(XEvent *e) {
1184         static XWindowAttributes wa;
1185         XMapRequestEvent *ev = &e->xmaprequest;
1186
1187         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1188                 return;
1189         if(wa.override_redirect)
1190                 return;
1191         if(!wintoclient(ev->window))
1192                 manage(ev->window, &wa);
1193 }
1194
1195 void
1196 monocle(Monitor *m) {
1197         unsigned int n = 0;
1198         Client *c;
1199
1200         for(c = m->clients; c; c = c->next)
1201                 if(ISVISIBLE(c))
1202                         n++;
1203         if(n > 0) /* override layout symbol */
1204                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1205         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1206                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1207 }
1208
1209 void
1210 motionnotify(XEvent *e) {
1211         static Monitor *mon = NULL;
1212         Monitor *m;
1213         XMotionEvent *ev = &e->xmotion;
1214
1215         if(ev->window != root)
1216                 return;
1217         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1218                 unfocus(selmon->sel, True);
1219                 selmon = m;
1220                 focus(NULL);
1221         }
1222         mon = m;
1223 }
1224
1225 void
1226 movemouse(const Arg *arg) {
1227         int x, y, ocx, ocy, nx, ny;
1228         Client *c;
1229         Monitor *m;
1230         XEvent ev;
1231
1232         if(!(c = selmon->sel))
1233                 return;
1234         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1235                 return;
1236         restack(selmon);
1237         ocx = c->x;
1238         ocy = c->y;
1239         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1240         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1241                 return;
1242         if(!getrootptr(&x, &y))
1243                 return;
1244         do {
1245                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1246                 switch(ev.type) {
1247                 case ConfigureRequest:
1248                 case Expose:
1249                 case MapRequest:
1250                         handler[ev.type](&ev);
1251                         break;
1252                 case MotionNotify:
1253                         nx = ocx + (ev.xmotion.x - x);
1254                         ny = ocy + (ev.xmotion.y - y);
1255                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1256                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1257                                 if(abs(selmon->wx - nx) < snap)
1258                                         nx = selmon->wx;
1259                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1260                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1261                                 if(abs(selmon->wy - ny) < snap)
1262                                         ny = selmon->wy;
1263                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1264                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1265                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1266                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1267                                         togglefloating(NULL);
1268                         }
1269                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1270                                 resize(c, nx, ny, c->w, c->h, True);
1271                         break;
1272                 }
1273         } while(ev.type != ButtonRelease);
1274         XUngrabPointer(dpy, CurrentTime);
1275         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1276                 sendmon(c, m);
1277                 selmon = m;
1278                 focus(NULL);
1279         }
1280 }
1281
1282 Client *
1283 nexttiled(Client *c) {
1284         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1285         return c;
1286 }
1287
1288 void
1289 pop(Client *c) {
1290         detach(c);
1291         attach(c);
1292         focus(c);
1293         arrange(c->mon);
1294 }
1295
1296 void
1297 propertynotify(XEvent *e) {
1298         Client *c;
1299         Window trans;
1300         XPropertyEvent *ev = &e->xproperty;
1301
1302         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1303                 updatestatus();
1304         else if(ev->state == PropertyDelete)
1305                 return; /* ignore */
1306         else if((c = wintoclient(ev->window))) {
1307                 switch(ev->atom) {
1308                 default: break;
1309                 case XA_WM_TRANSIENT_FOR:
1310                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1311                            (c->isfloating = (wintoclient(trans)) != NULL))
1312                                 arrange(c->mon);
1313                         break;
1314                 case XA_WM_NORMAL_HINTS:
1315                         updatesizehints(c);
1316                         break;
1317                 case XA_WM_HINTS:
1318                         updatewmhints(c);
1319                         drawbars();
1320                         break;
1321                 }
1322                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1323                         updatetitle(c);
1324                         if(c == c->mon->sel)
1325                                 drawbar(c->mon);
1326                 }
1327                 if(ev->atom == netatom[NetWMWindowType])
1328                         updatewindowtype(c);
1329         }
1330 }
1331
1332 void
1333 quit(const Arg *arg) {
1334         running = False;
1335 }
1336
1337 Monitor *
1338 recttomon(int x, int y, int w, int h) {
1339         Monitor *m, *r = selmon;
1340         int a, area = 0;
1341
1342         for(m = mons; m; m = m->next)
1343                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1344                         area = a;
1345                         r = m;
1346                 }
1347         return r;
1348 }
1349
1350 void
1351 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1352         if(applysizehints(c, &x, &y, &w, &h, interact))
1353                 resizeclient(c, x, y, w, h);
1354 }
1355
1356 void
1357 resizeclient(Client *c, int x, int y, int w, int h) {
1358         XWindowChanges wc;
1359
1360         c->oldx = c->x; c->x = wc.x = x;
1361         c->oldy = c->y; c->y = wc.y = y;
1362         c->oldw = c->w; c->w = wc.width = w;
1363         c->oldh = c->h; c->h = wc.height = h;
1364         wc.border_width = c->bw;
1365         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1366         configure(c);
1367         XSync(dpy, False);
1368 }
1369
1370 void
1371 resizemouse(const Arg *arg) {
1372         int ocx, ocy;
1373         int nw, nh;
1374         Client *c;
1375         Monitor *m;
1376         XEvent ev;
1377
1378         if(!(c = selmon->sel))
1379                 return;
1380         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1381                 return;
1382         restack(selmon);
1383         ocx = c->x;
1384         ocy = c->y;
1385         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1386                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1387                 return;
1388         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1389         do {
1390                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1391                 switch(ev.type) {
1392                 case ConfigureRequest:
1393                 case Expose:
1394                 case MapRequest:
1395                         handler[ev.type](&ev);
1396                         break;
1397                 case MotionNotify:
1398                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1399                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1400                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1401                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1402                         {
1403                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1404                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1405                                         togglefloating(NULL);
1406                         }
1407                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1408                                 resize(c, c->x, c->y, nw, nh, True);
1409                         break;
1410                 }
1411         } while(ev.type != ButtonRelease);
1412         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1413         XUngrabPointer(dpy, CurrentTime);
1414         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1415         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1416                 sendmon(c, m);
1417                 selmon = m;
1418                 focus(NULL);
1419         }
1420 }
1421
1422 void
1423 restack(Monitor *m) {
1424         Client *c;
1425         XEvent ev;
1426         XWindowChanges wc;
1427
1428         drawbar(m);
1429         if(!m->sel)
1430                 return;
1431         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1432                 XRaiseWindow(dpy, m->sel->win);
1433         if(m->lt[m->sellt]->arrange) {
1434                 wc.stack_mode = Below;
1435                 wc.sibling = m->barwin;
1436                 for(c = m->stack; c; c = c->snext)
1437                         if(!c->isfloating && ISVISIBLE(c)) {
1438                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1439                                 wc.sibling = c->win;
1440                         }
1441         }
1442         XSync(dpy, False);
1443         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1444 }
1445
1446 void
1447 run(void) {
1448         XEvent ev;
1449         /* main event loop */
1450         XSync(dpy, False);
1451         while(running && !XNextEvent(dpy, &ev))
1452                 if(handler[ev.type])
1453                         handler[ev.type](&ev); /* call handler */
1454 }
1455
1456 void
1457 scan(void) {
1458         unsigned int i, num;
1459         Window d1, d2, *wins = NULL;
1460         XWindowAttributes wa;
1461
1462         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1463                 for(i = 0; i < num; i++) {
1464                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1465                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1466                                 continue;
1467                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1468                                 manage(wins[i], &wa);
1469                 }
1470                 for(i = 0; i < num; i++) { /* now the transients */
1471                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1472                                 continue;
1473                         if(XGetTransientForHint(dpy, wins[i], &d1)
1474                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1475                                 manage(wins[i], &wa);
1476                 }
1477                 if(wins)
1478                         XFree(wins);
1479         }
1480 }
1481
1482 void
1483 sendmon(Client *c, Monitor *m) {
1484         if(c->mon == m)
1485                 return;
1486         unfocus(c, True);
1487         detach(c);
1488         detachstack(c);
1489         c->mon = m;
1490         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1491         attach(c);
1492         attachstack(c);
1493         focus(NULL);
1494         arrange(NULL);
1495 }
1496
1497 void
1498 setclientstate(Client *c, long state) {
1499         long data[] = { state, None };
1500
1501         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1502                         PropModeReplace, (unsigned char *)data, 2);
1503 }
1504
1505 Bool
1506 sendevent(Client *c, Atom proto) {
1507         int n;
1508         Atom *protocols;
1509         Bool exists = False;
1510         XEvent ev;
1511
1512         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1513                 while(!exists && n--)
1514                         exists = protocols[n] == proto;
1515                 XFree(protocols);
1516         }
1517         if(exists) {
1518                 ev.type = ClientMessage;
1519                 ev.xclient.window = c->win;
1520                 ev.xclient.message_type = wmatom[WMProtocols];
1521                 ev.xclient.format = 32;
1522                 ev.xclient.data.l[0] = proto;
1523                 ev.xclient.data.l[1] = CurrentTime;
1524                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1525         }
1526         return exists;
1527 }
1528
1529 void
1530 setfocus(Client *c) {
1531         if(!c->neverfocus) {
1532                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1533                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1534                                 XA_WINDOW, 32, PropModeReplace,
1535                                 (unsigned char *) &(c->win), 1);
1536         }
1537         sendevent(c, wmatom[WMTakeFocus]);
1538 }
1539
1540 void
1541 setfullscreen(Client *c, Bool fullscreen) {
1542         if(fullscreen) {
1543                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1544                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1545                 c->isfullscreen = True;
1546                 c->oldstate = c->isfloating;
1547                 c->oldbw = c->bw;
1548                 c->bw = 0;
1549                 c->isfloating = True;
1550                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1551                 XRaiseWindow(dpy, c->win);
1552         }
1553         else {
1554                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1555                                 PropModeReplace, (unsigned char*)0, 0);
1556                 c->isfullscreen = False;
1557                 c->isfloating = c->oldstate;
1558                 c->bw = c->oldbw;
1559                 c->x = c->oldx;
1560                 c->y = c->oldy;
1561                 c->w = c->oldw;
1562                 c->h = c->oldh;
1563                 resizeclient(c, c->x, c->y, c->w, c->h);
1564                 arrange(c->mon);
1565         }
1566 }
1567
1568 void
1569 setlayout(const Arg *arg) {
1570         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1571                 selmon->sellt ^= 1;
1572         if(arg && arg->v)
1573                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1574         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1575         if(selmon->sel)
1576                 arrange(selmon);
1577         else
1578                 drawbar(selmon);
1579 }
1580
1581 /* arg > 1.0 will set mfact absolutly */
1582 void
1583 setmfact(const Arg *arg) {
1584         float f;
1585
1586         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1587                 return;
1588         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1589         if(f < 0.1 || f > 0.9)
1590                 return;
1591         selmon->mfact = f;
1592         arrange(selmon);
1593 }
1594
1595 void
1596 setup(void) {
1597         XSetWindowAttributes wa;
1598
1599         /* clean up any zombies immediately */
1600         sigchld(0);
1601
1602         /* init screen */
1603         screen = DefaultScreen(dpy);
1604         root = RootWindow(dpy, screen);
1605         initfont(font);
1606         sw = DisplayWidth(dpy, screen);
1607         sh = DisplayHeight(dpy, screen);
1608         bh = dc.h = dc.font.height + 2;
1609         updategeom();
1610         /* init atoms */
1611         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1612         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1613         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1614         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1615         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1616         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1617         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1618         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1619         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1620         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1621         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1622         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1623         /* init cursors */
1624         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1625         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1626         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1627         /* init appearance */
1628         dc.norm[ColBorder] = getcolor(normbordercolor);
1629         dc.norm[ColBG] = getcolor(normbgcolor);
1630         dc.norm[ColFG] = getcolor(normfgcolor);
1631         dc.sel[ColBorder] = getcolor(selbordercolor);
1632         dc.sel[ColBG] = getcolor(selbgcolor);
1633         dc.sel[ColFG] = getcolor(selfgcolor);
1634         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1635         dc.gc = XCreateGC(dpy, root, 0, NULL);
1636         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1637         if(!dc.font.set)
1638                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1639         /* init bars */
1640         updatebars();
1641         updatestatus();
1642         /* EWMH support per view */
1643         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1644                         PropModeReplace, (unsigned char *) netatom, NetLast);
1645         XDeleteProperty(dpy, root, netatom[NetClientList]);
1646         /* select for events */
1647         wa.cursor = cursor[CurNormal];
1648         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1649                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1650         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1651         XSelectInput(dpy, root, wa.event_mask);
1652         grabkeys();
1653 }
1654
1655 void
1656 showhide(Client *c) {
1657         if(!c)
1658                 return;
1659         if(ISVISIBLE(c)) { /* show clients top down */
1660                 XMoveWindow(dpy, c->win, c->x, c->y);
1661                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1662                         resize(c, c->x, c->y, c->w, c->h, False);
1663                 showhide(c->snext);
1664         }
1665         else { /* hide clients bottom up */
1666                 showhide(c->snext);
1667                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1668         }
1669 }
1670
1671 void
1672 sigchld(int unused) {
1673         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1674                 die("Can't install SIGCHLD handler");
1675         while(0 < waitpid(-1, NULL, WNOHANG));
1676 }
1677
1678 void
1679 spawn(const Arg *arg) {
1680         if(fork() == 0) {
1681                 if(dpy)
1682                         close(ConnectionNumber(dpy));
1683                 setsid();
1684                 execvp(((char **)arg->v)[0], (char **)arg->v);
1685                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1686                 perror(" failed");
1687                 exit(EXIT_SUCCESS);
1688         }
1689 }
1690
1691 void
1692 tag(const Arg *arg) {
1693         if(selmon->sel && arg->ui & TAGMASK) {
1694                 selmon->sel->tags = arg->ui & TAGMASK;
1695                 focus(NULL);
1696                 arrange(selmon);
1697         }
1698 }
1699
1700 void
1701 tagmon(const Arg *arg) {
1702         if(!selmon->sel || !mons->next)
1703                 return;
1704         sendmon(selmon->sel, dirtomon(arg->i));
1705 }
1706
1707 int
1708 textnw(const char *text, unsigned int len) {
1709         XRectangle r;
1710
1711         if(dc.font.set) {
1712                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1713                 return r.width;
1714         }
1715         return XTextWidth(dc.font.xfont, text, len);
1716 }
1717
1718 void
1719 tile(Monitor *m) {
1720         unsigned int i, n, h, mw, my, ty;
1721         Client *c;
1722
1723         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1724         if(n == 0)
1725                 return;
1726
1727         if(n > m->nmaster)
1728                 mw = m->nmaster ? m->ww * m->mfact : 0;
1729         else
1730                 mw = m->ww;
1731         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1732                 if(i < m->nmaster) {
1733                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1734                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1735                         my += HEIGHT(c);
1736                 }
1737                 else {
1738                         h = (m->wh - ty) / (n - i);
1739                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1740                         ty += HEIGHT(c);
1741                 }
1742 }
1743
1744 void
1745 togglebar(const Arg *arg) {
1746         selmon->showbar = !selmon->showbar;
1747         updatebarpos(selmon);
1748         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1749         arrange(selmon);
1750 }
1751
1752 void
1753 togglefloating(const Arg *arg) {
1754         if(!selmon->sel)
1755                 return;
1756         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1757                 return;
1758         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1759         if(selmon->sel->isfloating)
1760                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1761                        selmon->sel->w, selmon->sel->h, False);
1762         arrange(selmon);
1763 }
1764
1765 void
1766 toggletag(const Arg *arg) {
1767         unsigned int newtags;
1768
1769         if(!selmon->sel)
1770                 return;
1771         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1772         if(newtags) {
1773                 selmon->sel->tags = newtags;
1774                 focus(NULL);
1775                 arrange(selmon);
1776         }
1777 }
1778
1779 void
1780 toggleview(const Arg *arg) {
1781         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1782
1783         if(newtagset) {
1784                 selmon->tagset[selmon->seltags] = newtagset;
1785                 focus(NULL);
1786                 arrange(selmon);
1787         }
1788 }
1789
1790 void
1791 unfocus(Client *c, Bool setfocus) {
1792         if(!c)
1793                 return;
1794         grabbuttons(c, False);
1795         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1796         if(setfocus) {
1797                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1798                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1799         }
1800 }
1801
1802 void
1803 unmanage(Client *c, Bool destroyed) {
1804         Monitor *m = c->mon;
1805         XWindowChanges wc;
1806
1807         /* The server grab construct avoids race conditions. */
1808         detach(c);
1809         detachstack(c);
1810         if(!destroyed) {
1811                 wc.border_width = c->oldbw;
1812                 XGrabServer(dpy);
1813                 XSetErrorHandler(xerrordummy);
1814                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1815                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1816                 setclientstate(c, WithdrawnState);
1817                 XSync(dpy, False);
1818                 XSetErrorHandler(xerror);
1819                 XUngrabServer(dpy);
1820         }
1821         free(c);
1822         focus(NULL);
1823         updateclientlist();
1824         arrange(m);
1825 }
1826
1827 void
1828 unmapnotify(XEvent *e) {
1829         Client *c;
1830         XUnmapEvent *ev = &e->xunmap;
1831
1832         if((c = wintoclient(ev->window))) {
1833                 if(ev->send_event)
1834                         setclientstate(c, WithdrawnState);
1835                 else
1836                         unmanage(c, False);
1837         }
1838 }
1839
1840 void
1841 updatebars(void) {
1842         Monitor *m;
1843         XSetWindowAttributes wa = {
1844                 .override_redirect = True,
1845                 .background_pixmap = ParentRelative,
1846                 .event_mask = ButtonPressMask|ExposureMask
1847         };
1848         for(m = mons; m; m = m->next) {
1849                 if (m->barwin)
1850                         continue;
1851                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1852                                           CopyFromParent, DefaultVisual(dpy, screen),
1853                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1854                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1855                 XMapRaised(dpy, m->barwin);
1856         }
1857 }
1858
1859 void
1860 updatebarpos(Monitor *m) {
1861         m->wy = m->my;
1862         m->wh = m->mh;
1863         if(m->showbar) {
1864                 m->wh -= bh;
1865                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1866                 m->wy = m->topbar ? m->wy + bh : m->wy;
1867         }
1868         else
1869                 m->by = -bh;
1870 }
1871
1872 void
1873 updateclientlist() {
1874         Client *c;
1875         Monitor *m;
1876
1877         XDeleteProperty(dpy, root, netatom[NetClientList]);
1878         for(m = mons; m; m = m->next)
1879                 for(c = m->clients; c; c = c->next)
1880                         XChangeProperty(dpy, root, netatom[NetClientList],
1881                                         XA_WINDOW, 32, PropModeAppend,
1882                                         (unsigned char *) &(c->win), 1);
1883 }
1884
1885 void
1886 updategeom(void) {
1887         /* Starting with dwm 6.1 this function uses a new (simpler) strategy:
1888          * whenever screen changes are reported, we destroy all monitors
1889          * and recreate all unique origin monitors and add all clients to
1890          * the first monitor, only. In several circumstances this may suck,
1891          * but dealing with all corner-cases sucks even more.*/
1892
1893 #ifdef XINERAMA
1894         if(XineramaIsActive(dpy)) {
1895                 int i, j, n;
1896                 Client *c;
1897                 Monitor *m, *oldmons = mons;
1898                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &n);
1899                 XineramaScreenInfo *unique = NULL;
1900
1901                 /* only consider unique geometries as separate screens */
1902                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * n)))
1903                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * n);
1904                 for(i = 0, j = 0; i < n; i++)
1905                         if(isuniquegeom(unique, j, &info[i]))
1906                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1907                 XFree(info);
1908                 /* create new monitor structure */
1909                 n = j;
1910                 mons = m = createmon(); /* new first monitor */
1911                 for(i = 1; i < n; i++) {
1912                         m->next = createmon();
1913                         m = m->next;
1914                 }
1915                 for(i = 0, m = mons; i < n && m; m = m->next, i++) {
1916                         m->num = i;
1917                         m->mx = m->wx = unique[i].x_org;
1918                         m->my = m->wy = unique[i].y_org;
1919                         m->mw = m->ww = unique[i].width;
1920                         m->mh = m->wh = unique[i].height;
1921                         updatebarpos(m);
1922                 }
1923                 free(unique);
1924                 /* re-attach old clients and cleanup old monitor structure */
1925                 while(oldmons) {
1926                         m = oldmons;
1927                         while(m->clients) {
1928                                 c = m->clients;
1929                                 m->clients = c->next;
1930                                 detachstack(c);
1931                                 c->mon = mons;
1932                                 attach(c);
1933                                 attachstack(c);
1934                         }
1935                         oldmons = m->next;
1936                         cleanupmon(m);
1937                 }
1938         }
1939         else
1940 #endif /* XINERAMA */
1941         /* default monitor setup */
1942         {
1943                 if(!mons) /* only true if !XINERAMA compile flag */
1944                         mons = createmon();
1945                 if(mons->mw != sw || mons->mh != sh) {
1946                         mons->mw = mons->ww = sw;
1947                         mons->mh = mons->wh = sh;
1948                         updatebarpos(mons);
1949                 }
1950         }
1951         selmon = mons;
1952         selmon = wintomon(root);
1953 }
1954
1955 void
1956 updatenumlockmask(void) {
1957         unsigned int i, j;
1958         XModifierKeymap *modmap;
1959
1960         numlockmask = 0;
1961         modmap = XGetModifierMapping(dpy);
1962         for(i = 0; i < 8; i++)
1963                 for(j = 0; j < modmap->max_keypermod; j++)
1964                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1965                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1966                                 numlockmask = (1 << i);
1967         XFreeModifiermap(modmap);
1968 }
1969
1970 void
1971 updatesizehints(Client *c) {
1972         long msize;
1973         XSizeHints size;
1974
1975         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1976                 /* size is uninitialized, ensure that size.flags aren't used */
1977                 size.flags = PSize;
1978         if(size.flags & PBaseSize) {
1979                 c->basew = size.base_width;
1980                 c->baseh = size.base_height;
1981         }
1982         else if(size.flags & PMinSize) {
1983                 c->basew = size.min_width;
1984                 c->baseh = size.min_height;
1985         }
1986         else
1987                 c->basew = c->baseh = 0;
1988         if(size.flags & PResizeInc) {
1989                 c->incw = size.width_inc;
1990                 c->inch = size.height_inc;
1991         }
1992         else
1993                 c->incw = c->inch = 0;
1994         if(size.flags & PMaxSize) {
1995                 c->maxw = size.max_width;
1996                 c->maxh = size.max_height;
1997         }
1998         else
1999                 c->maxw = c->maxh = 0;
2000         if(size.flags & PMinSize) {
2001                 c->minw = size.min_width;
2002                 c->minh = size.min_height;
2003         }
2004         else if(size.flags & PBaseSize) {
2005                 c->minw = size.base_width;
2006                 c->minh = size.base_height;
2007         }
2008         else
2009                 c->minw = c->minh = 0;
2010         if(size.flags & PAspect) {
2011                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2012                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2013         }
2014         else
2015                 c->maxa = c->mina = 0.0;
2016         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2017                      && c->maxw == c->minw && c->maxh == c->minh);
2018 }
2019
2020 void
2021 updatetitle(Client *c) {
2022         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2023                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2024         if(c->name[0] == '\0') /* hack to mark broken clients */
2025                 strcpy(c->name, broken);
2026 }
2027
2028 void
2029 updatestatus(void) {
2030         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2031                 strcpy(stext, "dwm-"VERSION);
2032         drawbar(selmon);
2033 }
2034
2035 void
2036 updatewindowtype(Client *c) {
2037         Atom state = getatomprop(c, netatom[NetWMState]);
2038         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2039
2040         if(state == netatom[NetWMFullscreen])
2041                 setfullscreen(c, True);
2042         if(wtype == netatom[NetWMWindowTypeDialog])
2043                 c->isfloating = True;
2044 }
2045
2046 void
2047 updatewmhints(Client *c) {
2048         XWMHints *wmh;
2049
2050         if((wmh = XGetWMHints(dpy, c->win))) {
2051                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2052                         wmh->flags &= ~XUrgencyHint;
2053                         XSetWMHints(dpy, c->win, wmh);
2054                 }
2055                 else
2056                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2057                 if(wmh->flags & InputHint)
2058                         c->neverfocus = !wmh->input;
2059                 else
2060                         c->neverfocus = False;
2061                 XFree(wmh);
2062         }
2063 }
2064
2065 void
2066 view(const Arg *arg) {
2067         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2068                 return;
2069         selmon->seltags ^= 1; /* toggle sel tagset */
2070         if(arg->ui & TAGMASK)
2071                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2072         focus(NULL);
2073         arrange(selmon);
2074 }
2075
2076 Client *
2077 wintoclient(Window w) {
2078         Client *c;
2079         Monitor *m;
2080
2081         for(m = mons; m; m = m->next)
2082                 for(c = m->clients; c; c = c->next)
2083                         if(c->win == w)
2084                                 return c;
2085         return NULL;
2086 }
2087
2088 Monitor *
2089 wintomon(Window w) {
2090         int x, y;
2091         Client *c;
2092         Monitor *m;
2093
2094         if(w == root && getrootptr(&x, &y))
2095                 return recttomon(x, y, 1, 1);
2096         for(m = mons; m; m = m->next)
2097                 if(w == m->barwin)
2098                         return m;
2099         if((c = wintoclient(w)))
2100                 return c->mon;
2101         return selmon;
2102 }
2103
2104 /* There's no way to check accesses to destroyed windows, thus those cases are
2105  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2106  * default error handler, which may call exit.  */
2107 int
2108 xerror(Display *dpy, XErrorEvent *ee) {
2109         if(ee->error_code == BadWindow
2110         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2111         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2112         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2113         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2114         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2115         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2116         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2117         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2118                 return 0;
2119         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2120                         ee->request_code, ee->error_code);
2121         return xerrorxlib(dpy, ee); /* may call exit */
2122 }
2123
2124 int
2125 xerrordummy(Display *dpy, XErrorEvent *ee) {
2126         return 0;
2127 }
2128
2129 /* Startup Error handler to check if another window manager
2130  * is already running. */
2131 int
2132 xerrorstart(Display *dpy, XErrorEvent *ee) {
2133         die("dwm: another window manager is already running\n");
2134         return -1;
2135 }
2136
2137 void
2138 zoom(const Arg *arg) {
2139         Client *c = selmon->sel;
2140
2141         if(!selmon->lt[selmon->sellt]->arrange
2142         || (selmon->sel && selmon->sel->isfloating))
2143                 return;
2144         if(c == nexttiled(selmon->clients))
2145                 if(!c || !(c = nexttiled(c->next)))
2146                         return;
2147         pop(c);
2148 }
2149
2150 int
2151 main(int argc, char *argv[]) {
2152         if(argc == 2 && !strcmp("-v", argv[1]))
2153                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2154         else if(argc != 1)
2155                 die("usage: dwm [-v]\n");
2156         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2157                 fputs("warning: no locale support\n", stderr);
2158         if(!(dpy = XOpenDisplay(NULL)))
2159                 die("dwm: cannot open display\n");
2160         checkotherwm();
2161         setup();
2162         scan();
2163         run();
2164         cleanup();
2165         XCloseDisplay(dpy);
2166         return EXIT_SUCCESS;
2167 }