dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif /* XINERAMA */
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  46 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  47                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  48 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  49 #define LENGTH(X)               (sizeof X / sizeof X[0])
  50 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  51 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  54 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  55 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  56 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  57
  58 /* enums */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetWMState,
  62        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  63        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  64 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  65 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  66        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  67
  68 typedef union {
  69         int i;
  70         unsigned int ui;
  71         float f;
  72         const void *v;
  73 } Arg;
  74
  75 typedef struct {
  76         unsigned int click;
  77         unsigned int mask;
  78         unsigned int button;
  79         void (*func)(const Arg *arg);
  80         const Arg arg;
  81 } Button;
  82
  83 typedef struct Monitor Monitor;
  84 typedef struct Client Client;
  85 struct Client {
  86         char name[256];
  87         float mina, maxa;
  88         int x, y, w, h;
  89         int oldx, oldy, oldw, oldh;
  90         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  91         int bw, oldbw;
  92         unsigned int tags;
  93         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  94         Client *next;
  95         Client *snext;
  96         Monitor *mon;
  97         Window win;
  98 };
  99
 100 typedef struct {
 101         int x, y, w, h;
 102         unsigned long norm[ColLast];
 103         unsigned long sel[ColLast];
 104         Drawable drawable;
 105         GC gc;
 106         struct {
 107                 int ascent;
 108                 int descent;
 109                 int height;
 110                 XFontSet set;
 111                 XFontStruct *xfont;
 112         } font;
 113 } DC; /* draw context */
 114
 115 typedef struct {
 116         unsigned int mod;
 117         KeySym keysym;
 118         void (*func)(const Arg *);
 119         const Arg arg;
 120 } Key;
 121
 122 typedef struct {
 123         const char *symbol;
 124         void (*arrange)(Monitor *);
 125 } Layout;
 126
 127 struct Monitor {
 128         char ltsymbol[16];
 129         float mfact;
 130         int nmaster;
 131         int num;
 132         int by;               /* bar geometry */
 133         int mx, my, mw, mh;   /* screen size */
 134         int wx, wy, ww, wh;   /* window area  */
 135         unsigned int seltags;
 136         unsigned int sellt;
 137         unsigned int tagset[2];
 138         Bool showbar;
 139         Bool topbar;
 140         Client *clients;
 141         Client *sel;
 142         Client *stack;
 143         Monitor *next;
 144         Window barwin;
 145         const Layout *lt[2];
 146 };
 147
 148 typedef struct {
 149         const char *class;
 150         const char *instance;
 151         const char *title;
 152         unsigned int tags;
 153         Bool isfloating;
 154         int monitor;
 155 } Rule;
 156
 157 /* function declarations */
 158 static void applyrules(Client *c);
 159 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 160 static void arrange(Monitor *m);
 161 static void arrangemon(Monitor *m);
 162 static void attach(Client *c);
 163 static void attachstack(Client *c);
 164 static void buttonpress(XEvent *e);
 165 static void checkotherwm(void);
 166 static void cleanup(void);
 167 static void cleanupmon(Monitor *mon);
 168 static void clearurgent(Client *c);
 169 static void clientmessage(XEvent *e);
 170 static void configure(Client *c);
 171 static void configurenotify(XEvent *e);
 172 static void configurerequest(XEvent *e);
 173 static Monitor *createmon(void);
 174 static void destroynotify(XEvent *e);
 175 static void detach(Client *c);
 176 static void detachstack(Client *c);
 177 static void die(const char *errstr, ...);
 178 static Monitor *dirtomon(int dir);
 179 static void drawbar(Monitor *m);
 180 static void drawbars(void);
 181 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 182 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 183 static void enternotify(XEvent *e);
 184 static void expose(XEvent *e);
 185 static void focus(Client *c);
 186 static void focusin(XEvent *e);
 187 static void focusmon(const Arg *arg);
 188 static void focusstack(const Arg *arg);
 189 static unsigned long getcolor(const char *colstr);
 190 static Bool getrootptr(int *x, int *y);
 191 static long getstate(Window w);
 192 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 193 static void grabbuttons(Client *c, Bool focused);
 194 static void grabkeys(void);
 195 static void incnmaster(const Arg *arg);
 196 static void initfont(const char *fontstr);
 197 static void keypress(XEvent *e);
 198 static void killclient(const Arg *arg);
 199 static void manage(Window w, XWindowAttributes *wa);
 200 static void mappingnotify(XEvent *e);
 201 static void maprequest(XEvent *e);
 202 static void monocle(Monitor *m);
 203 static void motionnotify(XEvent *e);
 204 static void movemouse(const Arg *arg);
 205 static Client *nexttiled(Client *c);
 206 static void pop(Client *);
 207 static void propertynotify(XEvent *e);
 208 static void quit(const Arg *arg);
 209 static Monitor *recttomon(int x, int y, int w, int h);
 210 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 211 static void resizeclient(Client *c, int x, int y, int w, int h);
 212 static void resizemouse(const Arg *arg);
 213 static void restack(Monitor *m);
 214 static void run(void);
 215 static void scan(void);
 216 static Bool sendevent(Client *c, Atom proto);
 217 static void sendmon(Client *c, Monitor *m);
 218 static void setclientstate(Client *c, long state);
 219 static void setfocus(Client *c);
 220 static void setfullscreen(Client *c, Bool fullscreen);
 221 static void setlayout(const Arg *arg);
 222 static void setmfact(const Arg *arg);
 223 static void setup(void);
 224 static void showhide(Client *c);
 225 static void sigchld(int unused);
 226 static void spawn(const Arg *arg);
 227 static void tag(const Arg *arg);
 228 static void tagmon(const Arg *arg);
 229 static int textnw(const char *text, unsigned int len);
 230 static void tile(Monitor *);
 231 static void togglebar(const Arg *arg);
 232 static void togglefloating(const Arg *arg);
 233 static void toggletag(const Arg *arg);
 234 static void toggleview(const Arg *arg);
 235 static void unfocus(Client *c, Bool setfocus);
 236 static void unmanage(Client *c, Bool destroyed);
 237 static void unmapnotify(XEvent *e);
 238 static Bool updategeom(void);
 239 static void updatebarpos(Monitor *m);
 240 static void updatebars(void);
 241 static void updateclientlist(void);
 242 static void updatenumlockmask(void);
 243 static void updatesizehints(Client *c);
 244 static void updatestatus(void);
 245 static void updatewindowtype(Client *c);
 246 static void updatetitle(Client *c);
 247 static void updatewmhints(Client *c);
 248 static void view(const Arg *arg);
 249 static Client *wintoclient(Window w);
 250 static Monitor *wintomon(Window w);
 251 static int xerror(Display *dpy, XErrorEvent *ee);
 252 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 253 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 254 static void zoom(const Arg *arg);
 255
 256 /* variables */
 257 static const char broken[] = "broken";
 258 static char stext[256];
 259 static int screen;
 260 static int sw, sh;           /* X display screen geometry width, height */
 261 static int bh, blw = 0;      /* bar geometry */
 262 static int (*xerrorxlib)(Display *, XErrorEvent *);
 263 static unsigned int numlockmask = 0;
 264 static void (*handler[LASTEvent]) (XEvent *) = {
 265         [ButtonPress] = buttonpress,
 266         [ClientMessage] = clientmessage,
 267         [ConfigureRequest] = configurerequest,
 268         [ConfigureNotify] = configurenotify,
 269         [DestroyNotify] = destroynotify,
 270         [EnterNotify] = enternotify,
 271         [Expose] = expose,
 272         [FocusIn] = focusin,
 273         [KeyPress] = keypress,
 274         [MappingNotify] = mappingnotify,
 275         [MapRequest] = maprequest,
 276         [MotionNotify] = motionnotify,
 277         [PropertyNotify] = propertynotify,
 278         [UnmapNotify] = unmapnotify
 279 };
 280 static Atom wmatom[WMLast], netatom[NetLast];
 281 static Bool running = True;
 282 static Cursor cursor[CurLast];
 283 static Display *dpy;
 284 static DC dc;
 285 static Monitor *mons = NULL, *selmon = NULL;
 286 static Window root;
 287
 288 /* configuration, allows nested code to access above variables */
 289 #include "config.h"
 290
 291 /* compile-time check if all tags fit into an unsigned int bit array. */
 292 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 293
 294 /* function implementations */
 295 void
 296 applyrules(Client *c) {
 297         const char *class, *instance;
 298         unsigned int i;
 299         const Rule *r;
 300         Monitor *m;
 301         XClassHint ch = { NULL, NULL };
 302
 303         /* rule matching */
 304         c->isfloating = c->tags = 0;
 305         XGetClassHint(dpy, c->win, &ch);
 306         class    = ch.res_class ? ch.res_class : broken;
 307         instance = ch.res_name  ? ch.res_name  : broken;
 308
 309         for(i = 0; i < LENGTH(rules); i++) {
 310                 r = &rules[i];
 311                 if((!r->title || strstr(c->name, r->title))
 312                 && (!r->class || strstr(class, r->class))
 313                 && (!r->instance || strstr(instance, r->instance)))
 314                 {
 315                         c->isfloating = r->isfloating;
 316                         c->tags |= r->tags;
 317                         for(m = mons; m && m->num != r->monitor; m = m->next);
 318                         if(m)
 319                                 c->mon = m;
 320                 }
 321         }
 322         if(ch.res_class)
 323                 XFree(ch.res_class);
 324         if(ch.res_name)
 325                 XFree(ch.res_name);
 326         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 327 }
 328
 329 Bool
 330 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 331         Bool baseismin;
 332         Monitor *m = c->mon;
 333
 334         /* set minimum possible */
 335         *w = MAX(1, *w);
 336         *h = MAX(1, *h);
 337         if(interact) {
 338                 if(*x > sw)
 339                         *x = sw - WIDTH(c);
 340                 if(*y > sh)
 341                         *y = sh - HEIGHT(c);
 342                 if(*x + *w + 2 * c->bw < 0)
 343                         *x = 0;
 344                 if(*y + *h + 2 * c->bw < 0)
 345                         *y = 0;
 346         }
 347         else {
 348                 if(*x >= m->wx + m->ww)
 349                         *x = m->wx + m->ww - WIDTH(c);
 350                 if(*y >= m->wy + m->wh)
 351                         *y = m->wy + m->wh - HEIGHT(c);
 352                 if(*x + *w + 2 * c->bw <= m->wx)
 353                         *x = m->wx;
 354                 if(*y + *h + 2 * c->bw <= m->wy)
 355                         *y = m->wy;
 356         }
 357         if(*h < bh)
 358                 *h = bh;
 359         if(*w < bh)
 360                 *w = bh;
 361         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 362                 /* see last two sentences in ICCCM 4.1.2.3 */
 363                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 364                 if(!baseismin) { /* temporarily remove base dimensions */
 365                         *w -= c->basew;
 366                         *h -= c->baseh;
 367                 }
 368                 /* adjust for aspect limits */
 369                 if(c->mina > 0 && c->maxa > 0) {
 370                         if(c->maxa < (float)*w / *h)
 371                                 *w = *h * c->maxa + 0.5;
 372                         else if(c->mina < (float)*h / *w)
 373                                 *h = *w * c->mina + 0.5;
 374                 }
 375                 if(baseismin) { /* increment calculation requires this */
 376                         *w -= c->basew;
 377                         *h -= c->baseh;
 378                 }
 379                 /* adjust for increment value */
 380                 if(c->incw)
 381                         *w -= *w % c->incw;
 382                 if(c->inch)
 383                         *h -= *h % c->inch;
 384                 /* restore base dimensions */
 385                 *w = MAX(*w + c->basew, c->minw);
 386                 *h = MAX(*h + c->baseh, c->minh);
 387                 if(c->maxw)
 388                         *w = MIN(*w, c->maxw);
 389                 if(c->maxh)
 390                         *h = MIN(*h, c->maxh);
 391         }
 392         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 393 }
 394
 395 void
 396 arrange(Monitor *m) {
 397         if(m)
 398                 showhide(m->stack);
 399         else for(m = mons; m; m = m->next)
 400                 showhide(m->stack);
 401         if(m) {
 402                 arrangemon(m);
 403                 restack(m);
 404         } else for(m = mons; m; m = m->next)
 405                 arrangemon(m);
 406 }
 407
 408 void
 409 arrangemon(Monitor *m) {
 410         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 411         if(m->lt[m->sellt]->arrange)
 412                 m->lt[m->sellt]->arrange(m);
 413 }
 414
 415 void
 416 attach(Client *c) {
 417         c->next = c->mon->clients;
 418         c->mon->clients = c;
 419 }
 420
 421 void
 422 attachstack(Client *c) {
 423         c->snext = c->mon->stack;
 424         c->mon->stack = c;
 425 }
 426
 427 void
 428 buttonpress(XEvent *e) {
 429         unsigned int i, x, click;
 430         Arg arg = {0};
 431         Client *c;
 432         Monitor *m;
 433         XButtonPressedEvent *ev = &e->xbutton;
 434
 435         click = ClkRootWin;
 436         /* focus monitor if necessary */
 437         if((m = wintomon(ev->window)) && m != selmon) {
 438                 unfocus(selmon->sel, True);
 439                 selmon = m;
 440                 focus(NULL);
 441         }
 442         if(ev->window == selmon->barwin) {
 443                 i = x = 0;
 444                 do
 445                         x += TEXTW(tags[i]);
 446                 while(ev->x >= x && ++i < LENGTH(tags));
 447                 if(i < LENGTH(tags)) {
 448                         click = ClkTagBar;
 449                         arg.ui = 1 << i;
 450                 }
 451                 else if(ev->x < x + blw)
 452                         click = ClkLtSymbol;
 453                 else if(ev->x > selmon->ww - TEXTW(stext))
 454                         click = ClkStatusText;
 455                 else
 456                         click = ClkWinTitle;
 457         }
 458         else if((c = wintoclient(ev->window))) {
 459                 focus(c);
 460                 click = ClkClientWin;
 461         }
 462         for(i = 0; i < LENGTH(buttons); i++)
 463                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 464                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 465                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 466 }
 467
 468 void
 469 checkotherwm(void) {
 470         xerrorxlib = XSetErrorHandler(xerrorstart);
 471         /* this causes an error if some other window manager is running */
 472         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 473         XSync(dpy, False);
 474         XSetErrorHandler(xerror);
 475         XSync(dpy, False);
 476 }
 477
 478 void
 479 cleanup(void) {
 480         Arg a = {.ui = ~0};
 481         Layout foo = { "", NULL };
 482         Monitor *m;
 483
 484         view(&a);
 485         selmon->lt[selmon->sellt] = &foo;
 486         for(m = mons; m; m = m->next)
 487                 while(m->stack)
 488                         unmanage(m->stack, False);
 489         if(dc.font.set)
 490                 XFreeFontSet(dpy, dc.font.set);
 491         else
 492                 XFreeFont(dpy, dc.font.xfont);
 493         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 494         XFreePixmap(dpy, dc.drawable);
 495         XFreeGC(dpy, dc.gc);
 496         XFreeCursor(dpy, cursor[CurNormal]);
 497         XFreeCursor(dpy, cursor[CurResize]);
 498         XFreeCursor(dpy, cursor[CurMove]);
 499         while(mons)
 500                 cleanupmon(mons);
 501         XSync(dpy, False);
 502         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 503         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 504 }
 505
 506 void
 507 cleanupmon(Monitor *mon) {
 508         Monitor *m;
 509
 510         if(mon == mons)
 511                 mons = mons->next;
 512         else {
 513                 for(m = mons; m && m->next != mon; m = m->next);
 514                 m->next = mon->next;
 515         }
 516         XUnmapWindow(dpy, mon->barwin);
 517         XDestroyWindow(dpy, mon->barwin);
 518         free(mon);
 519 }
 520
 521 void
 522 clearurgent(Client *c) {
 523         XWMHints *wmh;
 524
 525         c->isurgent = False;
 526         if(!(wmh = XGetWMHints(dpy, c->win)))
 527                 return;
 528         wmh->flags &= ~XUrgencyHint;
 529         XSetWMHints(dpy, c->win, wmh);
 530         XFree(wmh);
 531 }
 532
 533 void
 534 clientmessage(XEvent *e) {
 535         XClientMessageEvent *cme = &e->xclient;
 536         Client *c = wintoclient(cme->window);
 537
 538         if(!c)
 539                 return;
 540         if(cme->message_type == netatom[NetWMState]) {
 541                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 542                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 543                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 544         }
 545         else if(cme->message_type == netatom[NetActiveWindow]) {
 546                 if(!ISVISIBLE(c)) {
 547                         c->mon->seltags ^= 1;
 548                         c->mon->tagset[c->mon->seltags] = c->tags;
 549                 }
 550                 pop(c);
 551         }
 552 }
 553
 554 void
 555 configure(Client *c) {
 556         XConfigureEvent ce;
 557
 558         ce.type = ConfigureNotify;
 559         ce.display = dpy;
 560         ce.event = c->win;
 561         ce.window = c->win;
 562         ce.x = c->x;
 563         ce.y = c->y;
 564         ce.width = c->w;
 565         ce.height = c->h;
 566         ce.border_width = c->bw;
 567         ce.above = None;
 568         ce.override_redirect = False;
 569         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 570 }
 571
 572 void
 573 configurenotify(XEvent *e) {
 574         Monitor *m;
 575         XConfigureEvent *ev = &e->xconfigure;
 576         Bool dirty;
 577
 578         if(ev->window == root) {
 579                 dirty = (sw != ev->width);
 580                 sw = ev->width;
 581                 sh = ev->height;
 582                 if(updategeom() || dirty) {
 583                         if(dc.drawable != 0)
 584                                 XFreePixmap(dpy, dc.drawable);
 585                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 586                         updatebars();
 587                         for(m = mons; m; m = m->next)
 588                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 589                         focus(NULL);
 590                         arrange(NULL);
 591                 }
 592         }
 593 }
 594
 595 void
 596 configurerequest(XEvent *e) {
 597         Client *c;
 598         Monitor *m;
 599         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 600         XWindowChanges wc;
 601
 602         if((c = wintoclient(ev->window))) {
 603                 if(ev->value_mask & CWBorderWidth)
 604                         c->bw = ev->border_width;
 605                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 606                         m = c->mon;
 607                         if(ev->value_mask & CWX) {
 608                                 c->oldx = c->x;
 609                                 c->x = m->mx + ev->x;
 610                         }
 611                         if(ev->value_mask & CWY) {
 612                                 c->oldy = c->y;
 613                                 c->y = m->my + ev->y;
 614                         }
 615                         if(ev->value_mask & CWWidth) {
 616                                 c->oldw = c->w;
 617                                 c->w = ev->width;
 618                         }
 619                         if(ev->value_mask & CWHeight) {
 620                                 c->oldh = c->h;
 621                                 c->h = ev->height;
 622                         }
 623                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 624                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 625                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 626                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 627                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 628                                 configure(c);
 629                         if(ISVISIBLE(c))
 630                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 631                 }
 632                 else
 633                         configure(c);
 634         }
 635         else {
 636                 wc.x = ev->x;
 637                 wc.y = ev->y;
 638                 wc.width = ev->width;
 639                 wc.height = ev->height;
 640                 wc.border_width = ev->border_width;
 641                 wc.sibling = ev->above;
 642                 wc.stack_mode = ev->detail;
 643                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 644         }
 645         XSync(dpy, False);
 646 }
 647
 648 Monitor *
 649 createmon(void) {
 650         Monitor *m;
 651
 652         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 653                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 654         m->tagset[0] = m->tagset[1] = 1;
 655         m->mfact = mfact;
 656         m->nmaster = nmaster;
 657         m->showbar = showbar;
 658         m->topbar = topbar;
 659         m->lt[0] = &layouts[0];
 660         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 661         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 662         return m;
 663 }
 664
 665 void
 666 destroynotify(XEvent *e) {
 667         Client *c;
 668         XDestroyWindowEvent *ev = &e->xdestroywindow;
 669
 670         if((c = wintoclient(ev->window)))
 671                 unmanage(c, True);
 672 }
 673
 674 void
 675 detach(Client *c) {
 676         Client **tc;
 677
 678         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 679         *tc = c->next;
 680 }
 681
 682 void
 683 detachstack(Client *c) {
 684         Client **tc, *t;
 685
 686         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 687         *tc = c->snext;
 688
 689         if(c == c->mon->sel) {
 690                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 691                 c->mon->sel = t;
 692         }
 693 }
 694
 695 void
 696 die(const char *errstr, ...) {
 697         va_list ap;
 698
 699         va_start(ap, errstr);
 700         vfprintf(stderr, errstr, ap);
 701         va_end(ap);
 702         exit(EXIT_FAILURE);
 703 }
 704
 705 Monitor *
 706 dirtomon(int dir) {
 707         Monitor *m = NULL;
 708
 709         if(dir > 0) {
 710                 if(!(m = selmon->next))
 711                         m = mons;
 712         }
 713         else if(selmon == mons)
 714                 for(m = mons; m->next; m = m->next);
 715         else
 716                 for(m = mons; m->next != selmon; m = m->next);
 717         return m;
 718 }
 719
 720 void
 721 drawbar(Monitor *m) {
 722         int x;
 723         unsigned int i, occ = 0, urg = 0;
 724         unsigned long *col;
 725         Client *c;
 726
 727         for(c = m->clients; c; c = c->next) {
 728                 occ |= c->tags;
 729                 if(c->isurgent)
 730                         urg |= c->tags;
 731         }
 732         dc.x = 0;
 733         for(i = 0; i < LENGTH(tags); i++) {
 734                 dc.w = TEXTW(tags[i]);
 735                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 736                 drawtext(tags[i], col, urg & 1 << i);
 737                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 738                            occ & 1 << i, urg & 1 << i, col);
 739                 dc.x += dc.w;
 740         }
 741         dc.w = blw = TEXTW(m->ltsymbol);
 742         drawtext(m->ltsymbol, dc.norm, False);
 743         dc.x += dc.w;
 744         x = dc.x;
 745         if(m == selmon) { /* status is only drawn on selected monitor */
 746                 dc.w = TEXTW(stext);
 747                 dc.x = m->ww - dc.w;
 748                 if(dc.x < x) {
 749                         dc.x = x;
 750                         dc.w = m->ww - x;
 751                 }
 752                 drawtext(stext, dc.norm, False);
 753         }
 754         else
 755                 dc.x = m->ww;
 756         if((dc.w = dc.x - x) > bh) {
 757                 dc.x = x;
 758                 if(m->sel) {
 759                         col = m == selmon ? dc.sel : dc.norm;
 760                         drawtext(m->sel->name, col, False);
 761                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 762                 }
 763                 else
 764                         drawtext(NULL, dc.norm, False);
 765         }
 766         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 767         XSync(dpy, False);
 768 }
 769
 770 void
 771 drawbars(void) {
 772         Monitor *m;
 773
 774         for(m = mons; m; m = m->next)
 775                 drawbar(m);
 776 }
 777
 778 void
 779 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 780         int x;
 781
 782         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 783         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 784         if(filled)
 785                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 786         else if(empty)
 787                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 788 }
 789
 790 void
 791 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 792         char buf[256];
 793         int i, x, y, h, len, olen;
 794
 795         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 796         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 797         if(!text)
 798                 return;
 799         olen = strlen(text);
 800         h = dc.font.ascent + dc.font.descent;
 801         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 802         x = dc.x + (h / 2);
 803         /* shorten text if necessary */
 804         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 805         if(!len)
 806                 return;
 807         memcpy(buf, text, len);
 808         if(len < olen)
 809                 for(i = len; i && i > len - 3; buf[--i] = '.');
 810         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 811         if(dc.font.set)
 812                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 813         else
 814                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 815 }
 816
 817 void
 818 enternotify(XEvent *e) {
 819         Client *c;
 820         Monitor *m;
 821         XCrossingEvent *ev = &e->xcrossing;
 822
 823         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 824                 return;
 825         c = wintoclient(ev->window);
 826         m = c ? c->mon : wintomon(ev->window);
 827         if(m != selmon) {
 828                 unfocus(selmon->sel, True);
 829                 selmon = m;
 830         }
 831         else if(!c || c == selmon->sel)
 832                 return;
 833         focus(c);
 834 }
 835
 836 void
 837 expose(XEvent *e) {
 838         Monitor *m;
 839         XExposeEvent *ev = &e->xexpose;
 840
 841         if(ev->count == 0 && (m = wintomon(ev->window)))
 842                 drawbar(m);
 843 }
 844
 845 void
 846 focus(Client *c) {
 847         if(!c || !ISVISIBLE(c))
 848                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 849         /* was if(selmon->sel) */
 850         if(selmon->sel && selmon->sel != c)
 851                 unfocus(selmon->sel, False);
 852         if(c) {
 853                 if(c->mon != selmon)
 854                         selmon = c->mon;
 855                 if(c->isurgent)
 856                         clearurgent(c);
 857                 detachstack(c);
 858                 attachstack(c);
 859                 grabbuttons(c, True);
 860                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 861                 setfocus(c);
 862         }
 863         else {
 864                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 865                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 866         }
 867         selmon->sel = c;
 868         drawbars();
 869 }
 870
 871 void
 872 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 873         XFocusChangeEvent *ev = &e->xfocus;
 874
 875         if(selmon->sel && ev->window != selmon->sel->win)
 876                 setfocus(selmon->sel);
 877 }
 878
 879 void
 880 focusmon(const Arg *arg) {
 881         Monitor *m;
 882
 883         if(!mons->next)
 884                 return;
 885         if((m = dirtomon(arg->i)) == selmon)
 886                 return;
 887         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 888                                         in gedit and anjuta */
 889         selmon = m;
 890         focus(NULL);
 891 }
 892
 893 void
 894 focusstack(const Arg *arg) {
 895         Client *c = NULL, *i;
 896
 897         if(!selmon->sel)
 898                 return;
 899         if(arg->i > 0) {
 900                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 901                 if(!c)
 902                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 903         }
 904         else {
 905                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 906                         if(ISVISIBLE(i))
 907                                 c = i;
 908                 if(!c)
 909                         for(; i; i = i->next)
 910                                 if(ISVISIBLE(i))
 911                                         c = i;
 912         }
 913         if(c) {
 914                 focus(c);
 915                 restack(selmon);
 916         }
 917 }
 918
 919 Atom
 920 getatomprop(Client *c, Atom prop) {
 921         int di;
 922         unsigned long dl;
 923         unsigned char *p = NULL;
 924         Atom da, atom = None;
 925
 926         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 927                               &da, &di, &dl, &dl, &p) == Success && p) {
 928                 atom = *(Atom *)p;
 929                 XFree(p);
 930         }
 931         return atom;
 932 }
 933
 934 unsigned long
 935 getcolor(const char *colstr) {
 936         Colormap cmap = DefaultColormap(dpy, screen);
 937         XColor color;
 938
 939         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 940                 die("error, cannot allocate color '%s'\n", colstr);
 941         return color.pixel;
 942 }
 943
 944 Bool
 945 getrootptr(int *x, int *y) {
 946         int di;
 947         unsigned int dui;
 948         Window dummy;
 949
 950         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 951 }
 952
 953 long
 954 getstate(Window w) {
 955         int format;
 956         long result = -1;
 957         unsigned char *p = NULL;
 958         unsigned long n, extra;
 959         Atom real;
 960
 961         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 962                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 963                 return -1;
 964         if(n != 0)
 965                 result = *p;
 966         XFree(p);
 967         return result;
 968 }
 969
 970 Bool
 971 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 972         char **list = NULL;
 973         int n;
 974         XTextProperty name;
 975
 976         if(!text || size == 0)
 977                 return False;
 978         text[0] = '\0';
 979         XGetTextProperty(dpy, w, &name, atom);
 980         if(!name.nitems)
 981                 return False;
 982         if(name.encoding == XA_STRING)
 983                 strncpy(text, (char *)name.value, size - 1);
 984         else {
 985                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 986                         strncpy(text, *list, size - 1);
 987                         XFreeStringList(list);
 988                 }
 989         }
 990         text[size - 1] = '\0';
 991         XFree(name.value);
 992         return True;
 993 }
 994
 995 void
 996 grabbuttons(Client *c, Bool focused) {
 997         updatenumlockmask();
 998         {
 999                 unsigned int i, j;
1000                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1001                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1002                 if(focused) {
1003                         for(i = 0; i < LENGTH(buttons); i++)
1004                                 if(buttons[i].click == ClkClientWin)
1005                                         for(j = 0; j < LENGTH(modifiers); j++)
1006                                                 XGrabButton(dpy, buttons[i].button,
1007                                                             buttons[i].mask | modifiers[j],
1008                                                             c->win, False, BUTTONMASK,
1009                                                             GrabModeAsync, GrabModeSync, None, None);
1010                 }
1011                 else
1012                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1013                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1014         }
1015 }
1016
1017 void
1018 grabkeys(void) {
1019         updatenumlockmask();
1020         {
1021                 unsigned int i, j;
1022                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1023                 KeyCode code;
1024
1025                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1026                 for(i = 0; i < LENGTH(keys); i++)
1027                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1028                                 for(j = 0; j < LENGTH(modifiers); j++)
1029                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1030                                                  True, GrabModeAsync, GrabModeAsync);
1031         }
1032 }
1033
1034 void
1035 incnmaster(const Arg *arg) {
1036         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1037         arrange(selmon);
1038 }
1039
1040 void
1041 initfont(const char *fontstr) {
1042         char *def, **missing;
1043         int n;
1044
1045         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
1046         if(missing) {
1047                 while(n--)
1048                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
1049                 XFreeStringList(missing);
1050         }
1051         if(dc.font.set) {
1052                 XFontStruct **xfonts;
1053                 char **font_names;
1054
1055                 dc.font.ascent = dc.font.descent = 0;
1056                 XExtentsOfFontSet(dc.font.set);
1057                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
1058                 while(n--) {
1059                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
1060                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
1061                         xfonts++;
1062                 }
1063         }
1064         else {
1065                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
1066                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
1067                         die("error, cannot load font: '%s'\n", fontstr);
1068                 dc.font.ascent = dc.font.xfont->ascent;
1069                 dc.font.descent = dc.font.xfont->descent;
1070         }
1071         dc.font.height = dc.font.ascent + dc.font.descent;
1072 }
1073
1074 #ifdef XINERAMA
1075 static Bool
1076 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1077         while(n--)
1078                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1079                 && unique[n].width == info->width && unique[n].height == info->height)
1080                         return False;
1081         return True;
1082 }
1083 #endif /* XINERAMA */
1084
1085 void
1086 keypress(XEvent *e) {
1087         unsigned int i;
1088         KeySym keysym;
1089         XKeyEvent *ev;
1090
1091         ev = &e->xkey;
1092         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1093         for(i = 0; i < LENGTH(keys); i++)
1094                 if(keysym == keys[i].keysym
1095                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1096                 && keys[i].func)
1097                         keys[i].func(&(keys[i].arg));
1098 }
1099
1100 void
1101 killclient(const Arg *arg) {
1102         if(!selmon->sel)
1103                 return;
1104         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1105                 XGrabServer(dpy);
1106                 XSetErrorHandler(xerrordummy);
1107                 XSetCloseDownMode(dpy, DestroyAll);
1108                 XKillClient(dpy, selmon->sel->win);
1109                 XSync(dpy, False);
1110                 XSetErrorHandler(xerror);
1111                 XUngrabServer(dpy);
1112         }
1113 }
1114
1115 void
1116 manage(Window w, XWindowAttributes *wa) {
1117         Client *c, *t = NULL;
1118         Window trans = None;
1119         XWindowChanges wc;
1120
1121         if(!(c = calloc(1, sizeof(Client))))
1122                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1123         c->win = w;
1124         updatetitle(c);
1125         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1126                 c->mon = t->mon;
1127                 c->tags = t->tags;
1128         }
1129         else {
1130                 c->mon = selmon;
1131                 applyrules(c);
1132         }
1133         /* geometry */
1134         c->x = c->oldx = wa->x;
1135         c->y = c->oldy = wa->y;
1136         c->w = c->oldw = wa->width;
1137         c->h = c->oldh = wa->height;
1138         c->oldbw = wa->border_width;
1139
1140         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1141                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1142         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1143                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1144         c->x = MAX(c->x, c->mon->mx);
1145         /* only fix client y-offset, if the client center might cover the bar */
1146         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1147                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1148         c->bw = borderpx;
1149
1150         wc.border_width = c->bw;
1151         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1152         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1153         configure(c); /* propagates border_width, if size doesn't change */
1154         updatewindowtype(c);
1155         updatesizehints(c);
1156         updatewmhints(c);
1157         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1158         grabbuttons(c, False);
1159         if(!c->isfloating)
1160                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1161         if(c->isfloating)
1162                 XRaiseWindow(dpy, c->win);
1163         attach(c);
1164         attachstack(c);
1165         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1166                         (unsigned char *) &(c->win), 1);
1167         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1168         setclientstate(c, NormalState);
1169         if (c->mon == selmon)
1170                 unfocus(selmon->sel, False);
1171         c->mon->sel = c;
1172         arrange(c->mon);
1173         XMapWindow(dpy, c->win);
1174         focus(NULL);
1175 }
1176
1177 void
1178 mappingnotify(XEvent *e) {
1179         XMappingEvent *ev = &e->xmapping;
1180
1181         XRefreshKeyboardMapping(ev);
1182         if(ev->request == MappingKeyboard)
1183                 grabkeys();
1184 }
1185
1186 void
1187 maprequest(XEvent *e) {
1188         static XWindowAttributes wa;
1189         XMapRequestEvent *ev = &e->xmaprequest;
1190
1191         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1192                 return;
1193         if(wa.override_redirect)
1194                 return;
1195         if(!wintoclient(ev->window))
1196                 manage(ev->window, &wa);
1197 }
1198
1199 void
1200 monocle(Monitor *m) {
1201         unsigned int n = 0;
1202         Client *c;
1203
1204         for(c = m->clients; c; c = c->next)
1205                 if(ISVISIBLE(c))
1206                         n++;
1207         if(n > 0) /* override layout symbol */
1208                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1209         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1210                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1211 }
1212
1213 void
1214 motionnotify(XEvent *e) {
1215         static Monitor *mon = NULL;
1216         Monitor *m;
1217         XMotionEvent *ev = &e->xmotion;
1218
1219         if(ev->window != root)
1220                 return;
1221         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1222                 unfocus(selmon->sel, True);
1223                 selmon = m;
1224                 focus(NULL);
1225         }
1226         mon = m;
1227 }
1228
1229 void
1230 movemouse(const Arg *arg) {
1231         int x, y, ocx, ocy, nx, ny;
1232         Client *c;
1233         Monitor *m;
1234         XEvent ev;
1235
1236         if(!(c = selmon->sel))
1237                 return;
1238         restack(selmon);
1239         ocx = c->x;
1240         ocy = c->y;
1241         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1242         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1243                 return;
1244         if(!getrootptr(&x, &y))
1245                 return;
1246         do {
1247                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1248                 switch(ev.type) {
1249                 case ConfigureRequest:
1250                 case Expose:
1251                 case MapRequest:
1252                         handler[ev.type](&ev);
1253                         break;
1254                 case MotionNotify:
1255                         nx = ocx + (ev.xmotion.x - x);
1256                         ny = ocy + (ev.xmotion.y - y);
1257                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1258                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1259                                 if(abs(selmon->wx - nx) < snap)
1260                                         nx = selmon->wx;
1261                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1262                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1263                                 if(abs(selmon->wy - ny) < snap)
1264                                         ny = selmon->wy;
1265                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1266                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1267                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1268                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1269                                         togglefloating(NULL);
1270                         }
1271                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating) {
1272                                 if(c->isfullscreen)
1273                                         setfullscreen(c, False);
1274                                 resize(c, nx, ny, c->w, c->h, True);
1275                         }
1276                         break;
1277                 }
1278         } while(ev.type != ButtonRelease);
1279         XUngrabPointer(dpy, CurrentTime);
1280         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1281                 sendmon(c, m);
1282                 selmon = m;
1283                 focus(NULL);
1284         }
1285 }
1286
1287 Client *
1288 nexttiled(Client *c) {
1289         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1290         return c;
1291 }
1292
1293 void
1294 pop(Client *c) {
1295         detach(c);
1296         attach(c);
1297         focus(c);
1298         arrange(c->mon);
1299 }
1300
1301 void
1302 propertynotify(XEvent *e) {
1303         Client *c;
1304         Window trans;
1305         XPropertyEvent *ev = &e->xproperty;
1306
1307         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1308                 updatestatus();
1309         else if(ev->state == PropertyDelete)
1310                 return; /* ignore */
1311         else if((c = wintoclient(ev->window))) {
1312                 switch(ev->atom) {
1313                 default: break;
1314                 case XA_WM_TRANSIENT_FOR:
1315                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1316                            (c->isfloating = (wintoclient(trans)) != NULL))
1317                                 arrange(c->mon);
1318                         break;
1319                 case XA_WM_NORMAL_HINTS:
1320                         updatesizehints(c);
1321                         break;
1322                 case XA_WM_HINTS:
1323                         updatewmhints(c);
1324                         drawbars();
1325                         break;
1326                 }
1327                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1328                         updatetitle(c);
1329                         if(c == c->mon->sel)
1330                                 drawbar(c->mon);
1331                 }
1332                 if(ev->atom == netatom[NetWMWindowType])
1333                         updatewindowtype(c);
1334         }
1335 }
1336
1337 void
1338 quit(const Arg *arg) {
1339         running = False;
1340 }
1341
1342 Monitor *
1343 recttomon(int x, int y, int w, int h) {
1344         Monitor *m, *r = selmon;
1345         int a, area = 0;
1346
1347         for(m = mons; m; m = m->next)
1348                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1349                         area = a;
1350                         r = m;
1351                 }
1352         return r;
1353 }
1354
1355 void
1356 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1357         if(applysizehints(c, &x, &y, &w, &h, interact))
1358                 resizeclient(c, x, y, w, h);
1359 }
1360
1361 void
1362 resizeclient(Client *c, int x, int y, int w, int h) {
1363         XWindowChanges wc;
1364
1365         c->oldx = c->x; c->x = wc.x = x;
1366         c->oldy = c->y; c->y = wc.y = y;
1367         c->oldw = c->w; c->w = wc.width = w;
1368         c->oldh = c->h; c->h = wc.height = h;
1369         wc.border_width = c->bw;
1370         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1371         configure(c);
1372         XSync(dpy, False);
1373 }
1374
1375 void
1376 resizemouse(const Arg *arg) {
1377         int ocx, ocy;
1378         int nw, nh;
1379         Client *c;
1380         Monitor *m;
1381         XEvent ev;
1382
1383         if(!(c = selmon->sel))
1384                 return;
1385         restack(selmon);
1386         ocx = c->x;
1387         ocy = c->y;
1388         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1389                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1390                 return;
1391         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1392         do {
1393                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1394                 switch(ev.type) {
1395                 case ConfigureRequest:
1396                 case Expose:
1397                 case MapRequest:
1398                         handler[ev.type](&ev);
1399                         break;
1400                 case MotionNotify:
1401                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1402                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1403                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1404                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1405                         {
1406                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1407                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1408                                         togglefloating(NULL);
1409                         }
1410                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating) {
1411                                 if(c->isfullscreen)
1412                                         setfullscreen(c, False);
1413                                 resize(c, c->x, c->y, nw, nh, True);
1414                         }
1415                         break;
1416                 }
1417         } while(ev.type != ButtonRelease);
1418         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1419         XUngrabPointer(dpy, CurrentTime);
1420         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1421         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1422                 sendmon(c, m);
1423                 selmon = m;
1424                 focus(NULL);
1425         }
1426 }
1427
1428 void
1429 restack(Monitor *m) {
1430         Client *c;
1431         XEvent ev;
1432         XWindowChanges wc;
1433
1434         drawbar(m);
1435         if(!m->sel)
1436                 return;
1437         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1438                 XRaiseWindow(dpy, m->sel->win);
1439         if(m->lt[m->sellt]->arrange) {
1440                 wc.stack_mode = Below;
1441                 wc.sibling = m->barwin;
1442                 for(c = m->stack; c; c = c->snext)
1443                         if(!c->isfloating && ISVISIBLE(c)) {
1444                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1445                                 wc.sibling = c->win;
1446                         }
1447         }
1448         XSync(dpy, False);
1449         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1450 }
1451
1452 void
1453 run(void) {
1454         XEvent ev;
1455         /* main event loop */
1456         XSync(dpy, False);
1457         while(running && !XNextEvent(dpy, &ev))
1458                 if(handler[ev.type])
1459                         handler[ev.type](&ev); /* call handler */
1460 }
1461
1462 void
1463 scan(void) {
1464         unsigned int i, num;
1465         Window d1, d2, *wins = NULL;
1466         XWindowAttributes wa;
1467
1468         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1469                 for(i = 0; i < num; i++) {
1470                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1471                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1472                                 continue;
1473                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1474                                 manage(wins[i], &wa);
1475                 }
1476                 for(i = 0; i < num; i++) { /* now the transients */
1477                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1478                                 continue;
1479                         if(XGetTransientForHint(dpy, wins[i], &d1)
1480                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1481                                 manage(wins[i], &wa);
1482                 }
1483                 if(wins)
1484                         XFree(wins);
1485         }
1486 }
1487
1488 void
1489 sendmon(Client *c, Monitor *m) {
1490         if(c->mon == m)
1491                 return;
1492         unfocus(c, True);
1493         detach(c);
1494         detachstack(c);
1495         c->mon = m;
1496         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1497         attach(c);
1498         attachstack(c);
1499         focus(NULL);
1500         arrange(NULL);
1501 }
1502
1503 void
1504 setclientstate(Client *c, long state) {
1505         long data[] = { state, None };
1506
1507         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1508                         PropModeReplace, (unsigned char *)data, 2);
1509 }
1510
1511 Bool
1512 sendevent(Client *c, Atom proto) {
1513         int n;
1514         Atom *protocols;
1515         Bool exists = False;
1516         XEvent ev;
1517
1518         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1519                 while(!exists && n--)
1520                         exists = protocols[n] == proto;
1521                 XFree(protocols);
1522         }
1523         if(exists) {
1524                 ev.type = ClientMessage;
1525                 ev.xclient.window = c->win;
1526                 ev.xclient.message_type = wmatom[WMProtocols];
1527                 ev.xclient.format = 32;
1528                 ev.xclient.data.l[0] = proto;
1529                 ev.xclient.data.l[1] = CurrentTime;
1530                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1531         }
1532         return exists;
1533 }
1534
1535 void
1536 setfocus(Client *c) {
1537         if(!c->neverfocus) {
1538                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1539                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1540                                 XA_WINDOW, 32, PropModeReplace,
1541                                 (unsigned char *) &(c->win), 1);
1542         }
1543         sendevent(c, wmatom[WMTakeFocus]);
1544 }
1545
1546 void
1547 setfullscreen(Client *c, Bool fullscreen) {
1548         if(fullscreen) {
1549                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1550                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1551                 c->isfullscreen = True;
1552                 c->oldstate = c->isfloating;
1553                 c->oldbw = c->bw;
1554                 c->bw = 0;
1555                 c->isfloating = True;
1556                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1557                 XRaiseWindow(dpy, c->win);
1558         }
1559         else {
1560                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1561                                 PropModeReplace, (unsigned char*)0, 0);
1562                 c->isfullscreen = False;
1563                 c->isfloating = c->oldstate;
1564                 c->bw = c->oldbw;
1565                 c->x = c->oldx;
1566                 c->y = c->oldy;
1567                 c->w = c->oldw;
1568                 c->h = c->oldh;
1569                 resizeclient(c, c->x, c->y, c->w, c->h);
1570                 arrange(c->mon);
1571         }
1572 }
1573
1574 void
1575 setlayout(const Arg *arg) {
1576         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1577                 selmon->sellt ^= 1;
1578         if(arg && arg->v)
1579                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1580         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1581         if(selmon->sel)
1582                 arrange(selmon);
1583         else
1584                 drawbar(selmon);
1585 }
1586
1587 /* arg > 1.0 will set mfact absolutly */
1588 void
1589 setmfact(const Arg *arg) {
1590         float f;
1591
1592         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1593                 return;
1594         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1595         if(f < 0.1 || f > 0.9)
1596                 return;
1597         selmon->mfact = f;
1598         arrange(selmon);
1599 }
1600
1601 void
1602 setup(void) {
1603         XSetWindowAttributes wa;
1604
1605         /* clean up any zombies immediately */
1606         sigchld(0);
1607
1608         /* init screen */
1609         screen = DefaultScreen(dpy);
1610         root = RootWindow(dpy, screen);
1611         initfont(font);
1612         sw = DisplayWidth(dpy, screen);
1613         sh = DisplayHeight(dpy, screen);
1614         bh = dc.h = dc.font.height + 2;
1615         updategeom();
1616         /* init atoms */
1617         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1618         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1619         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1620         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1621         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1622         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1623         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1624         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1625         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1626         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1627         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1628         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1629         /* init cursors */
1630         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1631         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1632         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1633         /* init appearance */
1634         dc.norm[ColBorder] = getcolor(normbordercolor);
1635         dc.norm[ColBG] = getcolor(normbgcolor);
1636         dc.norm[ColFG] = getcolor(normfgcolor);
1637         dc.sel[ColBorder] = getcolor(selbordercolor);
1638         dc.sel[ColBG] = getcolor(selbgcolor);
1639         dc.sel[ColFG] = getcolor(selfgcolor);
1640         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1641         dc.gc = XCreateGC(dpy, root, 0, NULL);
1642         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1643         if(!dc.font.set)
1644                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1645         /* init bars */
1646         updatebars();
1647         updatestatus();
1648         /* EWMH support per view */
1649         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1650                         PropModeReplace, (unsigned char *) netatom, NetLast);
1651         XDeleteProperty(dpy, root, netatom[NetClientList]);
1652         /* select for events */
1653         wa.cursor = cursor[CurNormal];
1654         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1655                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1656         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1657         XSelectInput(dpy, root, wa.event_mask);
1658         grabkeys();
1659 }
1660
1661 void
1662 showhide(Client *c) {
1663         if(!c)
1664                 return;
1665         if(ISVISIBLE(c)) { /* show clients top down */
1666                 XMoveWindow(dpy, c->win, c->x, c->y);
1667                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1668                         resize(c, c->x, c->y, c->w, c->h, False);
1669                 showhide(c->snext);
1670         }
1671         else { /* hide clients bottom up */
1672                 showhide(c->snext);
1673                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1674         }
1675 }
1676
1677 void
1678 sigchld(int unused) {
1679         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1680                 die("Can't install SIGCHLD handler");
1681         while(0 < waitpid(-1, NULL, WNOHANG));
1682 }
1683
1684 void
1685 spawn(const Arg *arg) {
1686         if(fork() == 0) {
1687                 if(dpy)
1688                         close(ConnectionNumber(dpy));
1689                 setsid();
1690                 execvp(((char **)arg->v)[0], (char **)arg->v);
1691                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1692                 perror(" failed");
1693                 exit(EXIT_SUCCESS);
1694         }
1695 }
1696
1697 void
1698 tag(const Arg *arg) {
1699         if(selmon->sel && arg->ui & TAGMASK) {
1700                 selmon->sel->tags = arg->ui & TAGMASK;
1701                 focus(NULL);
1702                 arrange(selmon);
1703         }
1704 }
1705
1706 void
1707 tagmon(const Arg *arg) {
1708         if(!selmon->sel || !mons->next)
1709                 return;
1710         sendmon(selmon->sel, dirtomon(arg->i));
1711 }
1712
1713 int
1714 textnw(const char *text, unsigned int len) {
1715         XRectangle r;
1716
1717         if(dc.font.set) {
1718                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1719                 return r.width;
1720         }
1721         return XTextWidth(dc.font.xfont, text, len);
1722 }
1723
1724 void
1725 tile(Monitor *m) {
1726         unsigned int i, n, h, mw, my, ty;
1727         Client *c;
1728
1729         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1730         if(n == 0)
1731                 return;
1732
1733         if(n > m->nmaster)
1734                 mw = m->nmaster ? m->ww * m->mfact : 0;
1735         else
1736                 mw = m->ww;
1737         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1738                 if(i < m->nmaster) {
1739                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1740                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1741                         my += HEIGHT(c);
1742                 }
1743                 else {
1744                         h = (m->wh - ty) / (n - i);
1745                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1746                         ty += HEIGHT(c);
1747                 }
1748 }
1749
1750 void
1751 togglebar(const Arg *arg) {
1752         selmon->showbar = !selmon->showbar;
1753         updatebarpos(selmon);
1754         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1755         arrange(selmon);
1756 }
1757
1758 void
1759 togglefloating(const Arg *arg) {
1760         if(!selmon->sel)
1761                 return;
1762         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1763         if(selmon->sel->isfloating)
1764                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1765                        selmon->sel->w, selmon->sel->h, False);
1766         else if(selmon->sel->isfullscreen)
1767                 setfullscreen(selmon->sel, False);
1768         arrange(selmon);
1769 }
1770
1771 void
1772 toggletag(const Arg *arg) {
1773         unsigned int newtags;
1774
1775         if(!selmon->sel)
1776                 return;
1777         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1778         if(newtags) {
1779                 selmon->sel->tags = newtags;
1780                 focus(NULL);
1781                 arrange(selmon);
1782         }
1783 }
1784
1785 void
1786 toggleview(const Arg *arg) {
1787         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1788
1789         if(newtagset) {
1790                 selmon->tagset[selmon->seltags] = newtagset;
1791                 focus(NULL);
1792                 arrange(selmon);
1793         }
1794 }
1795
1796 void
1797 unfocus(Client *c, Bool setfocus) {
1798         if(!c)
1799                 return;
1800         grabbuttons(c, False);
1801         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder]);
1802         if(setfocus) {
1803                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1804                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1805         }
1806 }
1807
1808 void
1809 unmanage(Client *c, Bool destroyed) {
1810         Monitor *m = c->mon;
1811         XWindowChanges wc;
1812
1813         /* The server grab construct avoids race conditions. */
1814         detach(c);
1815         detachstack(c);
1816         if(!destroyed) {
1817                 wc.border_width = c->oldbw;
1818                 XGrabServer(dpy);
1819                 XSetErrorHandler(xerrordummy);
1820                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1821                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1822                 setclientstate(c, WithdrawnState);
1823                 XSync(dpy, False);
1824                 XSetErrorHandler(xerror);
1825                 XUngrabServer(dpy);
1826         }
1827         free(c);
1828         focus(NULL);
1829         updateclientlist();
1830         arrange(m);
1831 }
1832
1833 void
1834 unmapnotify(XEvent *e) {
1835         Client *c;
1836         XUnmapEvent *ev = &e->xunmap;
1837
1838         if((c = wintoclient(ev->window))) {
1839                 if(ev->send_event)
1840                         setclientstate(c, WithdrawnState);
1841                 else
1842                         unmanage(c, False);
1843         }
1844 }
1845
1846 void
1847 updatebars(void) {
1848         Monitor *m;
1849         XSetWindowAttributes wa = {
1850                 .override_redirect = True,
1851                 .background_pixmap = ParentRelative,
1852                 .event_mask = ButtonPressMask|ExposureMask
1853         };
1854         for(m = mons; m; m = m->next) {
1855                 if (m->barwin)
1856                         continue;
1857                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1858                                           CopyFromParent, DefaultVisual(dpy, screen),
1859                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1860                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1861                 XMapRaised(dpy, m->barwin);
1862         }
1863 }
1864
1865 void
1866 updatebarpos(Monitor *m) {
1867         m->wy = m->my;
1868         m->wh = m->mh;
1869         if(m->showbar) {
1870                 m->wh -= bh;
1871                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1872                 m->wy = m->topbar ? m->wy + bh : m->wy;
1873         }
1874         else
1875                 m->by = -bh;
1876 }
1877
1878 void
1879 updateclientlist() {
1880         Client *c;
1881         Monitor *m;
1882
1883         XDeleteProperty(dpy, root, netatom[NetClientList]);
1884         for(m = mons; m; m = m->next)
1885                 for(c = m->clients; c; c = c->next)
1886                         XChangeProperty(dpy, root, netatom[NetClientList],
1887                                         XA_WINDOW, 32, PropModeAppend,
1888                                         (unsigned char *) &(c->win), 1);
1889 }
1890
1891 Bool
1892 updategeom(void) {
1893         Bool dirty = False;
1894
1895 #ifdef XINERAMA
1896         if(XineramaIsActive(dpy)) {
1897                 int i, j, n, nn;
1898                 Client *c;
1899                 Monitor *m;
1900                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1901                 XineramaScreenInfo *unique = NULL;
1902
1903                 for(n = 0, m = mons; m; m = m->next, n++);
1904                 /* only consider unique geometries as separate screens */
1905                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1906                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1907                 for(i = 0, j = 0; i < nn; i++)
1908                         if(isuniquegeom(unique, j, &info[i]))
1909                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1910                 XFree(info);
1911                 nn = j;
1912                 if(n <= nn) {
1913                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1914                                 for(m = mons; m && m->next; m = m->next);
1915                                 if(m)
1916                                         m->next = createmon();
1917                                 else
1918                                         mons = createmon();
1919                         }
1920                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1921                                 if(i >= n
1922                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1923                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1924                                 {
1925                                         dirty = True;
1926                                         m->num = i;
1927                                         m->mx = m->wx = unique[i].x_org;
1928                                         m->my = m->wy = unique[i].y_org;
1929                                         m->mw = m->ww = unique[i].width;
1930                                         m->mh = m->wh = unique[i].height;
1931                                         updatebarpos(m);
1932                                 }
1933                 }
1934                 else { /* less monitors available nn < n */
1935                         for(i = nn; i < n; i++) {
1936                                 for(m = mons; m && m->next; m = m->next);
1937                                 while(m->clients) {
1938                                         dirty = True;
1939                                         c = m->clients;
1940                                         m->clients = c->next;
1941                                         detachstack(c);
1942                                         c->mon = mons;
1943                                         attach(c);
1944                                         attachstack(c);
1945                                 }
1946                                 if(m == selmon)
1947                                         selmon = mons;
1948                                 cleanupmon(m);
1949                         }
1950                 }
1951                 free(unique);
1952         }
1953         else
1954 #endif /* XINERAMA */
1955         /* default monitor setup */
1956         {
1957                 if(!mons)
1958                         mons = createmon();
1959                 if(mons->mw != sw || mons->mh != sh) {
1960                         dirty = True;
1961                         mons->mw = mons->ww = sw;
1962                         mons->mh = mons->wh = sh;
1963                         updatebarpos(mons);
1964                 }
1965         }
1966         if(dirty) {
1967                 selmon = mons;
1968                 selmon = wintomon(root);
1969         }
1970         return dirty;
1971 }
1972
1973 void
1974 updatenumlockmask(void) {
1975         unsigned int i, j;
1976         XModifierKeymap *modmap;
1977
1978         numlockmask = 0;
1979         modmap = XGetModifierMapping(dpy);
1980         for(i = 0; i < 8; i++)
1981                 for(j = 0; j < modmap->max_keypermod; j++)
1982                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1983                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1984                                 numlockmask = (1 << i);
1985         XFreeModifiermap(modmap);
1986 }
1987
1988 void
1989 updatesizehints(Client *c) {
1990         long msize;
1991         XSizeHints size;
1992
1993         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1994                 /* size is uninitialized, ensure that size.flags aren't used */
1995                 size.flags = PSize;
1996         if(size.flags & PBaseSize) {
1997                 c->basew = size.base_width;
1998                 c->baseh = size.base_height;
1999         }
2000         else if(size.flags & PMinSize) {
2001                 c->basew = size.min_width;
2002                 c->baseh = size.min_height;
2003         }
2004         else
2005                 c->basew = c->baseh = 0;
2006         if(size.flags & PResizeInc) {
2007                 c->incw = size.width_inc;
2008                 c->inch = size.height_inc;
2009         }
2010         else
2011                 c->incw = c->inch = 0;
2012         if(size.flags & PMaxSize) {
2013                 c->maxw = size.max_width;
2014                 c->maxh = size.max_height;
2015         }
2016         else
2017                 c->maxw = c->maxh = 0;
2018         if(size.flags & PMinSize) {
2019                 c->minw = size.min_width;
2020                 c->minh = size.min_height;
2021         }
2022         else if(size.flags & PBaseSize) {
2023                 c->minw = size.base_width;
2024                 c->minh = size.base_height;
2025         }
2026         else
2027                 c->minw = c->minh = 0;
2028         if(size.flags & PAspect) {
2029                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2030                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2031         }
2032         else
2033                 c->maxa = c->mina = 0.0;
2034         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2035                      && c->maxw == c->minw && c->maxh == c->minh);
2036 }
2037
2038 void
2039 updatetitle(Client *c) {
2040         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2041                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2042         if(c->name[0] == '\0') /* hack to mark broken clients */
2043                 strcpy(c->name, broken);
2044 }
2045
2046 void
2047 updatestatus(void) {
2048         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2049                 strcpy(stext, "dwm-"VERSION);
2050         drawbar(selmon);
2051 }
2052
2053 void
2054 updatewindowtype(Client *c) {
2055         Atom state = getatomprop(c, netatom[NetWMState]);
2056         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2057
2058         if(state == netatom[NetWMFullscreen])
2059                 setfullscreen(c, True);
2060         if(wtype == netatom[NetWMWindowTypeDialog])
2061                 c->isfloating = True;
2062 }
2063
2064 void
2065 updatewmhints(Client *c) {
2066         XWMHints *wmh;
2067
2068         if((wmh = XGetWMHints(dpy, c->win))) {
2069                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2070                         wmh->flags &= ~XUrgencyHint;
2071                         XSetWMHints(dpy, c->win, wmh);
2072                 }
2073                 else
2074                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2075                 if(wmh->flags & InputHint)
2076                         c->neverfocus = !wmh->input;
2077                 else
2078                         c->neverfocus = False;
2079                 XFree(wmh);
2080         }
2081 }
2082
2083 void
2084 view(const Arg *arg) {
2085         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2086                 return;
2087         selmon->seltags ^= 1; /* toggle sel tagset */
2088         if(arg->ui & TAGMASK)
2089                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2090         focus(NULL);
2091         arrange(selmon);
2092 }
2093
2094 Client *
2095 wintoclient(Window w) {
2096         Client *c;
2097         Monitor *m;
2098
2099         for(m = mons; m; m = m->next)
2100                 for(c = m->clients; c; c = c->next)
2101                         if(c->win == w)
2102                                 return c;
2103         return NULL;
2104 }
2105
2106 Monitor *
2107 wintomon(Window w) {
2108         int x, y;
2109         Client *c;
2110         Monitor *m;
2111
2112         if(w == root && getrootptr(&x, &y))
2113                 return recttomon(x, y, 1, 1);
2114         for(m = mons; m; m = m->next)
2115                 if(w == m->barwin)
2116                         return m;
2117         if((c = wintoclient(w)))
2118                 return c->mon;
2119         return selmon;
2120 }
2121
2122 /* There's no way to check accesses to destroyed windows, thus those cases are
2123  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2124  * default error handler, which may call exit.  */
2125 int
2126 xerror(Display *dpy, XErrorEvent *ee) {
2127         if(ee->error_code == BadWindow
2128         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2129         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2130         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2131         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2132         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2133         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2134         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2135         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2136                 return 0;
2137         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2138                         ee->request_code, ee->error_code);
2139         return xerrorxlib(dpy, ee); /* may call exit */
2140 }
2141
2142 int
2143 xerrordummy(Display *dpy, XErrorEvent *ee) {
2144         return 0;
2145 }
2146
2147 /* Startup Error handler to check if another window manager
2148  * is already running. */
2149 int
2150 xerrorstart(Display *dpy, XErrorEvent *ee) {
2151         die("dwm: another window manager is already running\n");
2152         return -1;
2153 }
2154
2155 void
2156 zoom(const Arg *arg) {
2157         Client *c = selmon->sel;
2158
2159         if(!selmon->lt[selmon->sellt]->arrange
2160         || (selmon->sel && selmon->sel->isfloating))
2161                 return;
2162         if(c == nexttiled(selmon->clients))
2163                 if(!c || !(c = nexttiled(c->next)))
2164                         return;
2165         pop(c);
2166 }
2167
2168 int
2169 main(int argc, char *argv[]) {
2170         if(argc == 2 && !strcmp("-v", argv[1]))
2171                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2172         else if(argc != 1)
2173                 die("usage: dwm [-v]\n");
2174         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2175                 fputs("warning: no locale support\n", stderr);
2176         if(!(dpy = XOpenDisplay(NULL)))
2177                 die("dwm: cannot open display\n");
2178         checkotherwm();
2179         setup();
2180         scan();
2181         run();
2182         cleanup();
2183         XCloseDisplay(dpy);
2184         return EXIT_SUCCESS;
2185 }