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