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