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