dwm.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <locale.h>
   4 #include <regex.h>
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <unistd.h>
  10 #include <sys/select.h>
  11 #include <sys/wait.h>
  12 #include <X11/cursorfont.h>
  13 #include <X11/keysym.h>
  14 #include <X11/Xatom.h>
  15 #include <X11/Xproto.h>
  16 #include <X11/Xutil.h>
  17
  18 /* macros */
  19 #define BUTTONMASK              (ButtonPressMask | ButtonReleaseMask)
  20 #define CLEANMASK(mask)         (mask & ~(numlockmask | LockMask))
  21 #define MOUSEMASK               (BUTTONMASK | PointerMotionMask)
  22
  23 /* enums */
  24 enum { BarTop, BarBot, BarOff };                        /* bar position */
  25 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  26 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  27 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  28 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
  29
  30 /* typedefs */
  31 typedef struct Client Client;
  32 struct Client {
  33         char name[256];
  34         int x, y, w, h;
  35         int rx, ry, rw, rh; /* revert geometry */
  36         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  37         int minax, maxax, minay, maxay;
  38         long flags;
  39         unsigned int border, oldborder;
  40         Bool isbanned, isfixed, ismax, isfloating;
  41         Bool *tags;
  42         Client *next;
  43         Client *prev;
  44         Client *snext;
  45         Window win;
  46 };
  47
  48 typedef struct {
  49         int x, y, w, h;
  50         unsigned long norm[ColLast];
  51         unsigned long sel[ColLast];
  52         Drawable drawable;
  53         GC gc;
  54         struct {
  55                 int ascent;
  56                 int descent;
  57                 int height;
  58                 XFontSet set;
  59                 XFontStruct *xfont;
  60         } font;
  61 } DC; /* draw context */
  62
  63 typedef struct {
  64         unsigned long mod;
  65         KeySym keysym;
  66         void (*func)(const char *arg);
  67         const char *arg;
  68 } Key;
  69
  70 typedef struct {
  71         const char *symbol;
  72         void (*arrange)(void);
  73 } Layout;
  74
  75 typedef struct {
  76         const char *prop;
  77         const char *tags;
  78         Bool isfloating;
  79 } Rule;
  80
  81 typedef struct {
  82         regex_t *propregex;
  83         regex_t *tagregex;
  84 } Regs;
  85
  86 /* functions */
  87 static void eprint(const char *errstr, ...);
  88 static void *emallocz(unsigned int size);
  89 static void spawn(const char *arg);
  90 static void drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]);
  91 static unsigned long initcolor(const char *colstr);
  92 static void initfont(const char *fontstr);
  93 static Bool isoccupied(unsigned int t);
  94 static unsigned int textnw(const char *text, unsigned int len);
  95 static void drawtext(const char *text, unsigned long col[ColLast]);
  96 static void drawbar(void);
  97 static void initstyle(void);
  98 static void initbar(void);
  99 static unsigned int textw(const char *text);
 100 static void togglebar(const char *arg);
 101 static void updatebarpos(void);
 102 static void attachstack(Client *c);
 103 static void detachstack(Client *c);
 104 static void grabbuttons(Client *c, Bool focused);
 105 static Bool isprotodel(Client *c);
 106 static void setclientstate(Client *c, long state);
 107 static int xerrordummy(Display *dsply, XErrorEvent *ee);
 108 static void ban(Client *c);
 109 static void configure(Client *c);
 110 static void killclient(const char *arg);
 111 static void manage(Window w, XWindowAttributes *wa);
 112 static void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 113 static void unban(Client *c);
 114 static void unmanage(Client *c);
 115 static void updatesizehints(Client *c);
 116 static void updatetitle(Client *c);
 117 static Client *getclient(Window w);
 118 static void movemouse(Client *c);
 119 static void resizemouse(Client *c);
 120 static void buttonpress(XEvent *e);
 121 static void configurerequest(XEvent *e);
 122 static void configurenotify(XEvent *e);
 123 static void destroynotify(XEvent *e);
 124 static void enternotify(XEvent *e);
 125 static void expose(XEvent *e);
 126 static void keypress(XEvent *e);
 127 static void leavenotify(XEvent *e);
 128 static void mappingnotify(XEvent *e);
 129 static void maprequest(XEvent *e);
 130 static void propertynotify(XEvent *e);
 131 static void unmapnotify(XEvent *e);
 132 static unsigned int idxoftag(const char *tag);
 133 static void floating(void); /* default floating layout */
 134 static void applyrules(Client *c);
 135 static void compileregs(void);
 136 static void focusnext(const char *arg);
 137 static void focusprev(const char *arg);
 138 static void initlayouts(void);
 139 static Bool isfloating(void);
 140 static Bool isvisible(Client *c);
 141 static void restack(void);
 142 static void setlayout(const char *arg);
 143 static void tag(const char *arg);
 144 static void togglefloating(const char *arg);
 145 static void togglemax(const char *arg);
 146 static void toggletag(const char *arg);
 147 static void toggleview(const char *arg);
 148 static void view(const char *arg);
 149 static void cleanup(void);
 150 static long getstate(Window w);
 151 static void scan(void);
 152 static void setup(void);
 153 static int xerrorstart(Display *dsply, XErrorEvent *ee);
 154 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 155 static void quit(const char *arg);
 156 static int xerror(Display *dpy, XErrorEvent *ee);
 157 static void arrange(void);
 158 static void attach(Client *c);
 159 static void detach(Client *c);
 160 static void focus(Client *c);
 161 static Bool isarrange(void (*func)());
 162 static Client *nexttiled(Client *c);
 163 static void setmwfact(const char *arg);
 164 static void tile(void);
 165 static void zoom(const char *arg);
 166
 167 #include "config.h"
 168
 169 /* variables */
 170 static char stext[256];
 171 static double mwfact = MWFACT;
 172 static int screen, sx, sy, sw, sh, wax, way, waw, wah;
 173 static int (*xerrorxlib)(Display *, XErrorEvent *);
 174 static unsigned int bh;
 175 static unsigned int blw = 0;
 176 static unsigned int bpos = BARPOS;
 177 static unsigned int ltidx = 0; /* default */
 178 static unsigned int nlayouts = 0;
 179 static unsigned int nrules = 0;
 180 static unsigned int ntags;
 181 static unsigned int numlockmask = 0;
 182 static void (*handler[LASTEvent]) (XEvent *) = {
 183         [ButtonPress] = buttonpress,
 184         [ConfigureRequest] = configurerequest,
 185         [ConfigureNotify] = configurenotify,
 186         [DestroyNotify] = destroynotify,
 187         [EnterNotify] = enternotify,
 188         [LeaveNotify] = leavenotify,
 189         [Expose] = expose,
 190         [KeyPress] = keypress,
 191         [MappingNotify] = mappingnotify,
 192         [MapRequest] = maprequest,
 193         [PropertyNotify] = propertynotify,
 194         [UnmapNotify] = unmapnotify
 195 };
 196 static Atom wmatom[WMLast], netatom[NetLast];
 197 static Bool otherwm, readin;
 198 static Bool running = True;
 199 static Bool *seltags;
 200 static Bool selscreen = True;
 201 static Client *clients = NULL;
 202 static Client *sel = NULL;
 203 static Client *stack = NULL;
 204 static Cursor cursor[CurLast];
 205 static Display *dpy;
 206 static DC dc = {0};
 207 static Window barwin, root;
 208 static Regs *regs = NULL;
 209
 210 static void
 211 eprint(const char *errstr, ...) {
 212         va_list ap;
 213
 214         va_start(ap, errstr);
 215         vfprintf(stderr, errstr, ap);
 216         va_end(ap);
 217         exit(EXIT_FAILURE);
 218 }
 219
 220 static void *
 221 emallocz(unsigned int size) {
 222         void *res = calloc(1, size);
 223
 224         if(!res)
 225                 eprint("fatal: could not malloc() %u bytes\n", size);
 226         return res;
 227 }
 228
 229 static void
 230 spawn(const char *arg) {
 231         static char *shell = NULL;
 232
 233         if(!shell && !(shell = getenv("SHELL")))
 234                 shell = "/bin/sh";
 235         if(!arg)
 236                 return;
 237         /* The double-fork construct avoids zombie processes and keeps the code
 238          * clean from stupid signal handlers. */
 239         if(fork() == 0) {
 240                 if(fork() == 0) {
 241                         if(dpy)
 242                                 close(ConnectionNumber(dpy));
 243                         setsid();
 244                         execl(shell, shell, "-c", arg, (char *)NULL);
 245                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
 246                         perror(" failed");
 247                 }
 248                 exit(0);
 249         }
 250         wait(0);
 251 }
 252
 253 static void
 254 drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) {
 255         int x;
 256         XGCValues gcv;
 257         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 258
 259         gcv.foreground = col[ColFG];
 260         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 261         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 262         r.x = dc.x + 1;
 263         r.y = dc.y + 1;
 264         if(filled) {
 265                 r.width = r.height = x + 1;
 266                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 267         }
 268         else if(empty) {
 269                 r.width = r.height = x;
 270                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 271         }
 272 }
 273
 274 static unsigned long
 275 initcolor(const char *colstr) {
 276         Colormap cmap = DefaultColormap(dpy, screen);
 277         XColor color;
 278
 279         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 280                 eprint("error, cannot allocate color '%s'\n", colstr);
 281         return color.pixel;
 282 }
 283
 284 static void
 285 initfont(const char *fontstr) {
 286         char *def, **missing;
 287         int i, n;
 288
 289         missing = NULL;
 290         if(dc.font.set)
 291                 XFreeFontSet(dpy, dc.font.set);
 292         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 293         if(missing) {
 294                 while(n--)
 295                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 296                 XFreeStringList(missing);
 297         }
 298         if(dc.font.set) {
 299                 XFontSetExtents *font_extents;
 300                 XFontStruct **xfonts;
 301                 char **font_names;
 302                 dc.font.ascent = dc.font.descent = 0;
 303                 font_extents = XExtentsOfFontSet(dc.font.set);
 304                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 305                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 306                         if(dc.font.ascent < (*xfonts)->ascent)
 307                                 dc.font.ascent = (*xfonts)->ascent;
 308                         if(dc.font.descent < (*xfonts)->descent)
 309                                 dc.font.descent = (*xfonts)->descent;
 310                         xfonts++;
 311                 }
 312         }
 313         else {
 314                 if(dc.font.xfont)
 315                         XFreeFont(dpy, dc.font.xfont);
 316                 dc.font.xfont = NULL;
 317                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 318                 || !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 319                         eprint("error, cannot load font: '%s'\n", fontstr);
 320                 dc.font.ascent = dc.font.xfont->ascent;
 321                 dc.font.descent = dc.font.xfont->descent;
 322         }
 323         dc.font.height = dc.font.ascent + dc.font.descent;
 324 }
 325
 326 static Bool
 327 isoccupied(unsigned int t) {
 328         Client *c;
 329
 330         for(c = clients; c; c = c->next)
 331                 if(c->tags[t])
 332                         return True;
 333         return False;
 334 }
 335
 336 static unsigned int
 337 textnw(const char *text, unsigned int len) {
 338         XRectangle r;
 339
 340         if(dc.font.set) {
 341                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 342                 return r.width;
 343         }
 344         return XTextWidth(dc.font.xfont, text, len);
 345 }
 346
 347 static void
 348 drawtext(const char *text, unsigned long col[ColLast]) {
 349         int x, y, w, h;
 350         static char buf[256];
 351         unsigned int len, olen;
 352         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 353
 354         XSetForeground(dpy, dc.gc, col[ColBG]);
 355         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 356         if(!text)
 357                 return;
 358         w = 0;
 359         olen = len = strlen(text);
 360         if(len >= sizeof buf)
 361                 len = sizeof buf - 1;
 362         memcpy(buf, text, len);
 363         buf[len] = 0;
 364         h = dc.font.ascent + dc.font.descent;
 365         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 366         x = dc.x + (h / 2);
 367         /* shorten text if necessary */
 368         while(len && (w = textnw(buf, len)) > dc.w - h)
 369                 buf[--len] = 0;
 370         if(len < olen) {
 371                 if(len > 1)
 372                         buf[len - 1] = '.';
 373                 if(len > 2)
 374                         buf[len - 2] = '.';
 375                 if(len > 3)
 376                         buf[len - 3] = '.';
 377         }
 378         if(w > dc.w)
 379                 return; /* too long */
 380         XSetForeground(dpy, dc.gc, col[ColFG]);
 381         if(dc.font.set)
 382                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 383         else
 384                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 385 }
 386
 387 static void
 388 drawbar(void) {
 389         int i, x;
 390
 391         dc.x = dc.y = 0;
 392         for(i = 0; i < ntags; i++) {
 393                 dc.w = textw(tags[i]);
 394                 if(seltags[i]) {
 395                         drawtext(tags[i], dc.sel);
 396                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel);
 397                 }
 398                 else {
 399                         drawtext(tags[i], dc.norm);
 400                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm);
 401                 }
 402                 dc.x += dc.w;
 403         }
 404         dc.w = blw;
 405         drawtext(layouts[ltidx].symbol, dc.norm);
 406         x = dc.x + dc.w;
 407         dc.w = textw(stext);
 408         dc.x = sw - dc.w;
 409         if(dc.x < x) {
 410                 dc.x = x;
 411                 dc.w = sw - x;
 412         }
 413         drawtext(stext, dc.norm);
 414         if((dc.w = dc.x - x) > bh) {
 415                 dc.x = x;
 416                 if(sel) {
 417                         drawtext(sel->name, dc.sel);
 418                         drawsquare(sel->ismax, sel->isfloating, dc.sel);
 419                 }
 420                 else
 421                         drawtext(NULL, dc.norm);
 422         }
 423         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 424         XSync(dpy, False);
 425 }
 426
 427 static void
 428 initstyle(void) {
 429         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 430         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 431         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 432         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 433         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 434         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 435         initfont(FONT);
 436         dc.h = bh = dc.font.height + 2;
 437 }
 438
 439 static void
 440 initbar(void) {
 441         XSetWindowAttributes wa;
 442
 443         wa.override_redirect = 1;
 444         wa.background_pixmap = ParentRelative;
 445         wa.event_mask = ButtonPressMask | ExposureMask;
 446         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 447                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 448                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 449         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 450         updatebarpos();
 451         XMapRaised(dpy, barwin);
 452         strcpy(stext, "dwm-"VERSION);
 453         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 454         dc.gc = XCreateGC(dpy, root, 0, 0);
 455         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 456         if(!dc.font.set)
 457                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 458 }
 459
 460 static unsigned int
 461 textw(const char *text) {
 462         return textnw(text, strlen(text)) + dc.font.height;
 463 }
 464
 465 static void
 466 togglebar(const char *arg) {
 467         if(bpos == BarOff)
 468                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
 469         else
 470                 bpos = BarOff;
 471         updatebarpos();
 472         arrange();
 473 }
 474
 475 static void
 476 updatebarpos(void) {
 477         XEvent ev;
 478
 479         wax = sx;
 480         way = sy;
 481         wah = sh;
 482         waw = sw;
 483         switch(bpos) {
 484         default:
 485                 wah -= bh;
 486                 way += bh;
 487                 XMoveWindow(dpy, barwin, sx, sy);
 488                 break;
 489         case BarBot:
 490                 wah -= bh;
 491                 XMoveWindow(dpy, barwin, sx, sy + wah);
 492                 break;
 493         case BarOff:
 494                 XMoveWindow(dpy, barwin, sx, sy - bh);
 495                 break;
 496         }
 497         XSync(dpy, False);
 498         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 499 }
 500
 501 static void
 502 attachstack(Client *c) {
 503         c->snext = stack;
 504         stack = c;
 505 }
 506
 507 static void
 508 detachstack(Client *c) {
 509         Client **tc;
 510
 511         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 512         *tc = c->snext;
 513 }
 514
 515 static void
 516 grabbuttons(Client *c, Bool focused) {
 517         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 518
 519         if(focused) {
 520                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 521                                 GrabModeAsync, GrabModeSync, None, None);
 522                 XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
 523                                 GrabModeAsync, GrabModeSync, None, None);
 524                 XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 525                                 GrabModeAsync, GrabModeSync, None, None);
 526                 XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 527                                 GrabModeAsync, GrabModeSync, None, None);
 528
 529                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 530                                 GrabModeAsync, GrabModeSync, None, None);
 531                 XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
 532                                 GrabModeAsync, GrabModeSync, None, None);
 533                 XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 534                                 GrabModeAsync, GrabModeSync, None, None);
 535                 XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 536                                 GrabModeAsync, GrabModeSync, None, None);
 537
 538                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 539                                 GrabModeAsync, GrabModeSync, None, None);
 540                 XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
 541                                 GrabModeAsync, GrabModeSync, None, None);
 542                 XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 543                                 GrabModeAsync, GrabModeSync, None, None);
 544                 XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 545                                 GrabModeAsync, GrabModeSync, None, None);
 546         }
 547         else
 548                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 549                                 GrabModeAsync, GrabModeSync, None, None);
 550 }
 551
 552 static Bool
 553 isprotodel(Client *c) {
 554         int i, n;
 555         Atom *protocols;
 556         Bool ret = False;
 557
 558         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 559                 for(i = 0; !ret && i < n; i++)
 560                         if(protocols[i] == wmatom[WMDelete])
 561                                 ret = True;
 562                 XFree(protocols);
 563         }
 564         return ret;
 565 }
 566
 567 static void
 568 setclientstate(Client *c, long state) {
 569         long data[] = {state, None};
 570
 571         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
 572                         PropModeReplace, (unsigned char *)data, 2);
 573 }
 574
 575 static int
 576 xerrordummy(Display *dsply, XErrorEvent *ee) {
 577         return 0;
 578 }
 579
 580 static void
 581 ban(Client *c) {
 582         if(c->isbanned)
 583                 return;
 584         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 585         c->isbanned = True;
 586 }
 587
 588 static void
 589 configure(Client *c) {
 590         XConfigureEvent ce;
 591
 592         ce.type = ConfigureNotify;
 593         ce.display = dpy;
 594         ce.event = c->win;
 595         ce.window = c->win;
 596         ce.x = c->x;
 597         ce.y = c->y;
 598         ce.width = c->w;
 599         ce.height = c->h;
 600         ce.border_width = c->border;
 601         ce.above = None;
 602         ce.override_redirect = False;
 603         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 604 }
 605
 606 static void
 607 killclient(const char *arg) {
 608         XEvent ev;
 609
 610         if(!sel)
 611                 return;
 612         if(isprotodel(sel)) {
 613                 ev.type = ClientMessage;
 614                 ev.xclient.window = sel->win;
 615                 ev.xclient.message_type = wmatom[WMProtocols];
 616                 ev.xclient.format = 32;
 617                 ev.xclient.data.l[0] = wmatom[WMDelete];
 618                 ev.xclient.data.l[1] = CurrentTime;
 619                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 620         }
 621         else
 622                 XKillClient(dpy, sel->win);
 623 }
 624
 625 static void
 626 manage(Window w, XWindowAttributes *wa) {
 627         unsigned int i;
 628         Client *c, *t = NULL;
 629         Window trans;
 630         Status rettrans;
 631         XWindowChanges wc;
 632
 633         c = emallocz(sizeof(Client));
 634         c->tags = emallocz(ntags * sizeof(Bool));
 635         c->win = w;
 636         c->x = wa->x;
 637         c->y = wa->y;
 638         c->w = wa->width;
 639         c->h = wa->height;
 640         c->oldborder = wa->border_width;
 641         if(c->w == sw && c->h == sh) {
 642                 c->x = sx;
 643                 c->y = sy;
 644                 c->border = wa->border_width;
 645         }
 646         else {
 647                 if(c->x + c->w + 2 * c->border > wax + waw)
 648                         c->x = wax + waw - c->w - 2 * c->border;
 649                 if(c->y + c->h + 2 * c->border > way + wah)
 650                         c->y = way + wah - c->h - 2 * c->border;
 651                 if(c->x < wax)
 652                         c->x = wax;
 653                 if(c->y < way)
 654                         c->y = way;
 655                 c->border = BORDERPX;
 656         }
 657         wc.border_width = c->border;
 658         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 659         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
 660         configure(c); /* propagates border_width, if size doesn't change */
 661         updatesizehints(c);
 662         XSelectInput(dpy, w,
 663                 StructureNotifyMask | PropertyChangeMask | EnterWindowMask);
 664         grabbuttons(c, False);
 665         updatetitle(c);
 666         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
 667                 for(t = clients; t && t->win != trans; t = t->next);
 668         if(t)
 669                 for(i = 0; i < ntags; i++)
 670                         c->tags[i] = t->tags[i];
 671         applyrules(c);
 672         if(!c->isfloating)
 673                 c->isfloating = (rettrans == Success) || c->isfixed;
 674         attach(c);
 675         attachstack(c);
 676         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
 677         ban(c);
 678         XMapWindow(dpy, c->win);
 679         setclientstate(c, NormalState);
 680         arrange();
 681 }
 682
 683 static void
 684 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
 685         double dx, dy, max, min, ratio;
 686         XWindowChanges wc;
 687
 688         if(sizehints) {
 689                 if(c->minay > 0 && c->maxay > 0 && (h - c->baseh) > 0 && (w - c->basew) > 0) {
 690                         dx = (double)(w - c->basew);
 691                         dy = (double)(h - c->baseh);
 692                         min = (double)(c->minax) / (double)(c->minay);
 693                         max = (double)(c->maxax) / (double)(c->maxay);
 694                         ratio = dx / dy;
 695                         if(max > 0 && min > 0 && ratio > 0) {
 696                                 if(ratio < min) {
 697                                         dy = (dx * min + dy) / (min * min + 1);
 698                                         dx = dy * min;
 699                                         w = (int)dx + c->basew;
 700                                         h = (int)dy + c->baseh;
 701                                 }
 702                                 else if(ratio > max) {
 703                                         dy = (dx * min + dy) / (max * max + 1);
 704                                         dx = dy * min;
 705                                         w = (int)dx + c->basew;
 706                                         h = (int)dy + c->baseh;
 707                                 }
 708                         }
 709                 }
 710                 if(c->minw && w < c->minw)
 711                         w = c->minw;
 712                 if(c->minh && h < c->minh)
 713                         h = c->minh;
 714                 if(c->maxw && w > c->maxw)
 715                         w = c->maxw;
 716                 if(c->maxh && h > c->maxh)
 717                         h = c->maxh;
 718                 if(c->incw)
 719                         w -= (w - c->basew) % c->incw;
 720                 if(c->inch)
 721                         h -= (h - c->baseh) % c->inch;
 722         }
 723         if(w <= 0 || h <= 0)
 724                 return;
 725         /* offscreen appearance fixes */
 726         if(x > sw)
 727                 x = sw - w - 2 * c->border;
 728         if(y > sh)
 729                 y = sh - h - 2 * c->border;
 730         if(x + w + 2 * c->border < sx)
 731                 x = sx;
 732         if(y + h + 2 * c->border < sy)
 733                 y = sy;
 734         if(c->x != x || c->y != y || c->w != w || c->h != h) {
 735                 c->x = wc.x = x;
 736                 c->y = wc.y = y;
 737                 c->w = wc.width = w;
 738                 c->h = wc.height = h;
 739                 wc.border_width = c->border;
 740                 XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
 741                 configure(c);
 742                 XSync(dpy, False);
 743         }
 744 }
 745
 746 static void
 747 unban(Client *c) {
 748         if(!c->isbanned)
 749                 return;
 750         XMoveWindow(dpy, c->win, c->x, c->y);
 751         c->isbanned = False;
 752 }
 753
 754 static void
 755 unmanage(Client *c) {
 756         XWindowChanges wc;
 757
 758         wc.border_width = c->oldborder;
 759         /* The server grab construct avoids race conditions. */
 760         XGrabServer(dpy);
 761         XSetErrorHandler(xerrordummy);
 762         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
 763         detach(c);
 764         detachstack(c);
 765         if(sel == c)
 766                 focus(NULL);
 767         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 768         setclientstate(c, WithdrawnState);
 769         free(c->tags);
 770         free(c);
 771         XSync(dpy, False);
 772         XSetErrorHandler(xerror);
 773         XUngrabServer(dpy);
 774         arrange();
 775 }
 776
 777 static void
 778 updatesizehints(Client *c) {
 779         long msize;
 780         XSizeHints size;
 781
 782         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
 783                 size.flags = PSize;
 784         c->flags = size.flags;
 785         if(c->flags & PBaseSize) {
 786                 c->basew = size.base_width;
 787                 c->baseh = size.base_height;
 788         }
 789         else if(c->flags & PMinSize) {
 790                 c->basew = size.min_width;
 791                 c->baseh = size.min_height;
 792         }
 793         else
 794                 c->basew = c->baseh = 0;
 795         if(c->flags & PResizeInc) {
 796                 c->incw = size.width_inc;
 797                 c->inch = size.height_inc;
 798         }
 799         else
 800                 c->incw = c->inch = 0;
 801         if(c->flags & PMaxSize) {
 802                 c->maxw = size.max_width;
 803                 c->maxh = size.max_height;
 804         }
 805         else
 806                 c->maxw = c->maxh = 0;
 807         if(c->flags & PMinSize) {
 808                 c->minw = size.min_width;
 809                 c->minh = size.min_height;
 810         }
 811         else if(c->flags & PBaseSize) {
 812                 c->minw = size.base_width;
 813                 c->minh = size.base_height;
 814         }
 815         else
 816                 c->minw = c->minh = 0;
 817         if(c->flags & PAspect) {
 818                 c->minax = size.min_aspect.x;
 819                 c->maxax = size.max_aspect.x;
 820                 c->minay = size.min_aspect.y;
 821                 c->maxay = size.max_aspect.y;
 822         }
 823         else
 824                 c->minax = c->maxax = c->minay = c->maxay = 0;
 825         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
 826                         && c->maxw == c->minw && c->maxh == c->minh);
 827 }
 828
 829 static void
 830 updatetitle(Client *c) {
 831         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
 832                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
 833 }
 834
 835 static Client *
 836 getclient(Window w) {
 837         Client *c;
 838
 839         for(c = clients; c && c->win != w; c = c->next);
 840         return c;
 841 }
 842
 843 static void
 844 movemouse(Client *c) {
 845         int x1, y1, ocx, ocy, di, nx, ny;
 846         unsigned int dui;
 847         Window dummy;
 848         XEvent ev;
 849
 850         ocx = nx = c->x;
 851         ocy = ny = c->y;
 852         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 853                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
 854                 return;
 855         c->ismax = False;
 856         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
 857         for(;;) {
 858                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
 859                 switch (ev.type) {
 860                 case ButtonRelease:
 861                         XUngrabPointer(dpy, CurrentTime);
 862                         return;
 863                 case ConfigureRequest:
 864                 case Expose:
 865                 case MapRequest:
 866                         handler[ev.type](&ev);
 867                         break;
 868                 case MotionNotify:
 869                         XSync(dpy, False);
 870                         nx = ocx + (ev.xmotion.x - x1);
 871                         ny = ocy + (ev.xmotion.y - y1);
 872                         if(abs(wax + nx) < SNAP)
 873                                 nx = wax;
 874                         else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
 875                                 nx = wax + waw - c->w - 2 * c->border;
 876                         if(abs(way - ny) < SNAP)
 877                                 ny = way;
 878                         else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
 879                                 ny = way + wah - c->h - 2 * c->border;
 880                         resize(c, nx, ny, c->w, c->h, False);
 881                         break;
 882                 }
 883         }
 884 }
 885
 886 static void
 887 resizemouse(Client *c) {
 888         int ocx, ocy;
 889         int nw, nh;
 890         XEvent ev;
 891
 892         ocx = c->x;
 893         ocy = c->y;
 894         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 895                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
 896                 return;
 897         c->ismax = False;
 898         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
 899         for(;;) {
 900                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
 901                 switch(ev.type) {
 902                 case ButtonRelease:
 903                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
 904                                         c->w + c->border - 1, c->h + c->border - 1);
 905                         XUngrabPointer(dpy, CurrentTime);
 906                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 907                         return;
 908                 case ConfigureRequest:
 909                 case Expose:
 910                 case MapRequest:
 911                         handler[ev.type](&ev);
 912                         break;
 913                 case MotionNotify:
 914                         XSync(dpy, False);
 915                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
 916                                 nw = 1;
 917                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
 918                                 nh = 1;
 919                         resize(c, c->x, c->y, nw, nh, True);
 920                         break;
 921                 }
 922         }
 923 }
 924
 925 static void
 926 buttonpress(XEvent *e) {
 927         unsigned int i, x;
 928         Client *c;
 929         XButtonPressedEvent *ev = &e->xbutton;
 930
 931         if(barwin == ev->window) {
 932                 x = 0;
 933                 for(i = 0; i < ntags; i++) {
 934                         x += textw(tags[i]);
 935                         if(ev->x < x) {
 936                                 if(ev->button == Button1) {
 937                                         if(ev->state & MODKEY)
 938                                                 tag(tags[i]);
 939                                         else
 940                                                 view(tags[i]);
 941                                 }
 942                                 else if(ev->button == Button3) {
 943                                         if(ev->state & MODKEY)
 944                                                 toggletag(tags[i]);
 945                                         else
 946                                                 toggleview(tags[i]);
 947                                 }
 948                                 return;
 949                         }
 950                 }
 951                 if((ev->x < x + blw) && ev->button == Button1)
 952                         setlayout(NULL);
 953         }
 954         else if((c = getclient(ev->window))) {
 955                 focus(c);
 956                 if(CLEANMASK(ev->state) != MODKEY)
 957                         return;
 958                 if(ev->button == Button1 && (isfloating() || c->isfloating)) {
 959                         restack();
 960                         movemouse(c);
 961                 }
 962                 else if(ev->button == Button2)
 963                         zoom(NULL);
 964                 else if(ev->button == Button3
 965                 && (isfloating() || c->isfloating) && !c->isfixed)
 966                 {
 967                         restack();
 968                         resizemouse(c);
 969                 }
 970         }
 971 }
 972
 973 static void
 974 configurerequest(XEvent *e) {
 975         Client *c;
 976         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 977         XWindowChanges wc;
 978
 979         if((c = getclient(ev->window))) {
 980                 c->ismax = False;
 981                 if(ev->value_mask & CWBorderWidth)
 982                         c->border = ev->border_width;
 983                 if(c->isfixed || c->isfloating || isfloating()) {
 984                         if(ev->value_mask & CWX)
 985                                 c->x = ev->x;
 986                         if(ev->value_mask & CWY)
 987                                 c->y = ev->y;
 988                         if(ev->value_mask & CWWidth)
 989                                 c->w = ev->width;
 990                         if(ev->value_mask & CWHeight)
 991                                 c->h = ev->height;
 992                         if((c->x + c->w) > sw && c->isfloating)
 993                                 c->x = sw / 2 - c->w / 2; /* center in x direction */
 994                         if((c->y + c->h) > sh && c->isfloating)
 995                                 c->y = sh / 2 - c->h / 2; /* center in y direction */
 996                         if((ev->value_mask & (CWX | CWY))
 997                         && !(ev->value_mask & (CWWidth | CWHeight)))
 998                                 configure(c);
 999                         if(isvisible(c))
1000                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
1001                 }
1002                 else
1003                         configure(c);
1004         }
1005         else {
1006                 wc.x = ev->x;
1007                 wc.y = ev->y;
1008                 wc.width = ev->width;
1009                 wc.height = ev->height;
1010                 wc.border_width = ev->border_width;
1011                 wc.sibling = ev->above;
1012                 wc.stack_mode = ev->detail;
1013                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
1014         }
1015         XSync(dpy, False);
1016 }
1017
1018 static void
1019 configurenotify(XEvent *e) {
1020         XConfigureEvent *ev = &e->xconfigure;
1021
1022         if (ev->window == root && (ev->width != sw || ev->height != sh)) {
1023                 sw = ev->width;
1024                 sh = ev->height;
1025                 XFreePixmap(dpy, dc.drawable);
1026                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
1027                 XResizeWindow(dpy, barwin, sw, bh);
1028                 updatebarpos();
1029                 arrange();
1030         }
1031 }
1032
1033 static void
1034 destroynotify(XEvent *e) {
1035         Client *c;
1036         XDestroyWindowEvent *ev = &e->xdestroywindow;
1037
1038         if((c = getclient(ev->window)))
1039                 unmanage(c);
1040 }
1041
1042 static void
1043 enternotify(XEvent *e) {
1044         Client *c;
1045         XCrossingEvent *ev = &e->xcrossing;
1046
1047         if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
1048                 return;
1049         if((c = getclient(ev->window)))
1050                 focus(c);
1051         else if(ev->window == root) {
1052                 selscreen = True;
1053                 focus(NULL);
1054         }
1055 }
1056
1057 static void
1058 expose(XEvent *e) {
1059         XExposeEvent *ev = &e->xexpose;
1060
1061         if(ev->count == 0) {
1062                 if(barwin == ev->window)
1063                         drawbar();
1064         }
1065 }
1066
1067 static void
1068 keypress(XEvent *e) {
1069         KEYS
1070         unsigned int len = sizeof keys / sizeof keys[0];
1071         unsigned int i;
1072         KeyCode code;
1073         KeySym keysym;
1074         XKeyEvent *ev;
1075
1076         if(!e) { /* grabkeys */
1077                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1078                 for(i = 0; i < len; i++) {
1079                         code = XKeysymToKeycode(dpy, keys[i].keysym);
1080                         XGrabKey(dpy, code, keys[i].mod, root, True,
1081                                         GrabModeAsync, GrabModeAsync);
1082                         XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
1083                                         GrabModeAsync, GrabModeAsync);
1084                         XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
1085                                         GrabModeAsync, GrabModeAsync);
1086                         XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
1087                                         GrabModeAsync, GrabModeAsync);
1088                 }
1089                 return;
1090         }
1091         ev = &e->xkey;
1092         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1093         for(i = 0; i < len; i++)
1094                 if(keysym == keys[i].keysym
1095                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
1096                 {
1097                         if(keys[i].func)
1098                                 keys[i].func(keys[i].arg);
1099                 }
1100 }
1101
1102 static void
1103 leavenotify(XEvent *e) {
1104         XCrossingEvent *ev = &e->xcrossing;
1105
1106         if((ev->window == root) && !ev->same_screen) {
1107                 selscreen = False;
1108                 focus(NULL);
1109         }
1110 }
1111
1112 static void
1113 mappingnotify(XEvent *e) {
1114         XMappingEvent *ev = &e->xmapping;
1115
1116         XRefreshKeyboardMapping(ev);
1117         if(ev->request == MappingKeyboard)
1118                 keypress(NULL);
1119 }
1120
1121 static void
1122 maprequest(XEvent *e) {
1123         static XWindowAttributes wa;
1124         XMapRequestEvent *ev = &e->xmaprequest;
1125
1126         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1127                 return;
1128         if(wa.override_redirect)
1129                 return;
1130         if(!getclient(ev->window))
1131                 manage(ev->window, &wa);
1132 }
1133
1134 static void
1135 propertynotify(XEvent *e) {
1136         Client *c;
1137         Window trans;
1138         XPropertyEvent *ev = &e->xproperty;
1139
1140         if(ev->state == PropertyDelete)
1141                 return; /* ignore */
1142         if((c = getclient(ev->window))) {
1143                 switch (ev->atom) {
1144                         default: break;
1145                         case XA_WM_TRANSIENT_FOR:
1146                                 XGetTransientForHint(dpy, c->win, &trans);
1147                                 if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1148                                         arrange();
1149                                 break;
1150                         case XA_WM_NORMAL_HINTS:
1151                                 updatesizehints(c);
1152                                 break;
1153                 }
1154                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1155                         updatetitle(c);
1156                         if(c == sel)
1157                                 drawbar();
1158                 }
1159         }
1160 }
1161
1162 static void
1163 unmapnotify(XEvent *e) {
1164         Client *c;
1165         XUnmapEvent *ev = &e->xunmap;
1166
1167         if((c = getclient(ev->window)))
1168                 unmanage(c);
1169 }
1170
1171 static unsigned int
1172 idxoftag(const char *tag) {
1173         unsigned int i;
1174
1175         for(i = 0; i < ntags; i++)
1176                 if(tags[i] == tag)
1177                         return i;
1178         return 0;
1179 }
1180
1181 static void
1182 floating(void) { /* default floating layout */
1183         Client *c;
1184
1185         for(c = clients; c; c = c->next)
1186                 if(isvisible(c))
1187                         resize(c, c->x, c->y, c->w, c->h, True);
1188 }
1189
1190 static void
1191 applyrules(Client *c) {
1192         static char buf[512];
1193         unsigned int i, j;
1194         regmatch_t tmp;
1195         Bool matched = False;
1196         XClassHint ch = { 0 };
1197
1198         /* rule matching */
1199         XGetClassHint(dpy, c->win, &ch);
1200         snprintf(buf, sizeof buf, "%s:%s:%s",
1201                         ch.res_class ? ch.res_class : "",
1202                         ch.res_name ? ch.res_name : "", c->name);
1203         for(i = 0; i < nrules; i++)
1204                 if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
1205                         c->isfloating = rules[i].isfloating;
1206                         for(j = 0; regs[i].tagregex && j < ntags; j++) {
1207                                 if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
1208                                         matched = True;
1209                                         c->tags[j] = True;
1210                                 }
1211                         }
1212                 }
1213         if(ch.res_class)
1214                 XFree(ch.res_class);
1215         if(ch.res_name)
1216                 XFree(ch.res_name);
1217         if(!matched)
1218                 for(i = 0; i < ntags; i++)
1219                         c->tags[i] = seltags[i];
1220 }
1221
1222 static void
1223 compileregs(void) {
1224         unsigned int i;
1225         regex_t *reg;
1226
1227         if(regs)
1228                 return;
1229         nrules = sizeof rules / sizeof rules[0];
1230         regs = emallocz(nrules * sizeof(Regs));
1231         for(i = 0; i < nrules; i++) {
1232                 if(rules[i].prop) {
1233                         reg = emallocz(sizeof(regex_t));
1234                         if(regcomp(reg, rules[i].prop, REG_EXTENDED))
1235                                 free(reg);
1236                         else
1237                                 regs[i].propregex = reg;
1238                 }
1239                 if(rules[i].tags) {
1240                         reg = emallocz(sizeof(regex_t));
1241                         if(regcomp(reg, rules[i].tags, REG_EXTENDED))
1242                                 free(reg);
1243                         else
1244                                 regs[i].tagregex = reg;
1245                 }
1246         }
1247 }
1248
1249 static void
1250 focusnext(const char *arg) {
1251         Client *c;
1252
1253         if(!sel)
1254                 return;
1255         for(c = sel->next; c && !isvisible(c); c = c->next);
1256         if(!c)
1257                 for(c = clients; c && !isvisible(c); c = c->next);
1258         if(c) {
1259                 focus(c);
1260                 restack();
1261         }
1262 }
1263
1264 static void
1265 focusprev(const char *arg) {
1266         Client *c;
1267
1268         if(!sel)
1269                 return;
1270         for(c = sel->prev; c && !isvisible(c); c = c->prev);
1271         if(!c) {
1272                 for(c = clients; c && c->next; c = c->next);
1273                 for(; c && !isvisible(c); c = c->prev);
1274         }
1275         if(c) {
1276                 focus(c);
1277                 restack();
1278         }
1279 }
1280
1281 static void
1282 initlayouts(void) {
1283         unsigned int i, w;
1284
1285         nlayouts = sizeof layouts / sizeof layouts[0];
1286         for(blw = i = 0; i < nlayouts; i++) {
1287                 w = textw(layouts[i].symbol);
1288                 if(w > blw)
1289                         blw = w;
1290         }
1291 }
1292
1293 static Bool
1294 isfloating(void) {
1295         return layouts[ltidx].arrange == floating;
1296 }
1297
1298 static Bool
1299 isvisible(Client *c) {
1300         unsigned int i;
1301
1302         for(i = 0; i < ntags; i++)
1303                 if(c->tags[i] && seltags[i])
1304                         return True;
1305         return False;
1306 }
1307
1308 static void
1309 restack(void) {
1310         Client *c;
1311         XEvent ev;
1312         XWindowChanges wc;
1313
1314         drawbar();
1315         if(!sel)
1316                 return;
1317         if(sel->isfloating || isfloating())
1318                 XRaiseWindow(dpy, sel->win);
1319         if(!isfloating()) {
1320                 wc.stack_mode = Below;
1321                 wc.sibling = barwin;
1322                 if(!sel->isfloating) {
1323                         XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1324                         wc.sibling = sel->win;
1325                 }
1326                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1327                         if(c == sel)
1328                                 continue;
1329                         XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1330                         wc.sibling = c->win;
1331                 }
1332         }
1333         XSync(dpy, False);
1334         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1335 }
1336
1337 static void
1338 setlayout(const char *arg) {
1339         unsigned int i;
1340
1341         if(!arg) {
1342                 if(++ltidx == nlayouts)
1343                         ltidx = 0;;
1344         }
1345         else {
1346                 for(i = 0; i < nlayouts; i++)
1347                         if(!strcmp(arg, layouts[i].symbol))
1348                                 break;
1349                 if(i == nlayouts)
1350                         return;
1351                 ltidx = i;
1352         }
1353         if(sel)
1354                 arrange();
1355         else
1356                 drawbar();
1357 }
1358
1359 static void
1360 tag(const char *arg) {
1361         unsigned int i;
1362
1363         if(!sel)
1364                 return;
1365         for(i = 0; i < ntags; i++)
1366                 sel->tags[i] = arg == NULL;
1367         i = idxoftag(arg);
1368         if(i >= 0 && i < ntags)
1369                 sel->tags[i] = True;
1370         arrange();
1371 }
1372
1373 static void
1374 togglefloating(const char *arg) {
1375         if(!sel)
1376                 return;
1377         sel->isfloating = !sel->isfloating;
1378         if(sel->isfloating)
1379                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1380         arrange();
1381 }
1382
1383 static void
1384 togglemax(const char *arg) {
1385         XEvent ev;
1386
1387         if(!sel || (!isfloating() && !sel->isfloating) || sel->isfixed)
1388                 return;
1389         if((sel->ismax = !sel->ismax)) {
1390                 sel->rx = sel->x;
1391                 sel->ry = sel->y;
1392                 sel->rw = sel->w;
1393                 sel->rh = sel->h;
1394                 resize(sel, wax, way, waw - 2 * sel->border, wah - 2 * sel->border, True);
1395         }
1396         else
1397                 resize(sel, sel->rx, sel->ry, sel->rw, sel->rh, True);
1398         drawbar();
1399         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1400 }
1401
1402 static void
1403 toggletag(const char *arg) {
1404         unsigned int i, j;
1405
1406         if(!sel)
1407                 return;
1408         i = idxoftag(arg);
1409         sel->tags[i] = !sel->tags[i];
1410         for(j = 0; j < ntags && !sel->tags[j]; j++);
1411         if(j == ntags)
1412                 sel->tags[i] = True;
1413         arrange();
1414 }
1415
1416 static void
1417 toggleview(const char *arg) {
1418         unsigned int i, j;
1419
1420         i = idxoftag(arg);
1421         seltags[i] = !seltags[i];
1422         for(j = 0; j < ntags && !seltags[j]; j++);
1423         if(j == ntags)
1424                 seltags[i] = True; /* cannot toggle last view */
1425         arrange();
1426 }
1427
1428 static void
1429 view(const char *arg) {
1430         unsigned int i;
1431
1432         for(i = 0; i < ntags; i++)
1433                 seltags[i] = arg == NULL;
1434         i = idxoftag(arg);
1435         if(i >= 0 && i < ntags)
1436                 seltags[i] = True;
1437         arrange();
1438 }
1439
1440 static void
1441 cleanup(void) {
1442         close(STDIN_FILENO);
1443         while(stack) {
1444                 unban(stack);
1445                 unmanage(stack);
1446         }
1447         if(dc.font.set)
1448                 XFreeFontSet(dpy, dc.font.set);
1449         else
1450                 XFreeFont(dpy, dc.font.xfont);
1451         XUngrabKey(dpy, AnyKey, AnyModifier, root);
1452         XFreePixmap(dpy, dc.drawable);
1453         XFreeGC(dpy, dc.gc);
1454         XDestroyWindow(dpy, barwin);
1455         XFreeCursor(dpy, cursor[CurNormal]);
1456         XFreeCursor(dpy, cursor[CurResize]);
1457         XFreeCursor(dpy, cursor[CurMove]);
1458         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
1459         XSync(dpy, False);
1460         free(seltags);
1461 }
1462
1463 static long
1464 getstate(Window w) {
1465         int format, status;
1466         long result = -1;
1467         unsigned char *p = NULL;
1468         unsigned long n, extra;
1469         Atom real;
1470
1471         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
1472                         &real, &format, &n, &extra, (unsigned char **)&p);
1473         if(status != Success)
1474                 return -1;
1475         if(n != 0)
1476                 result = *p;
1477         XFree(p);
1478         return result;
1479 }
1480
1481 static void
1482 scan(void) {
1483         unsigned int i, num;
1484         Window *wins, d1, d2;
1485         XWindowAttributes wa;
1486
1487         wins = NULL;
1488         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1489                 for(i = 0; i < num; i++) {
1490                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1491                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1492                                 continue;
1493                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1494                                 manage(wins[i], &wa);
1495                 }
1496                 for(i = 0; i < num; i++) { /* now the transients */
1497                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1498                                 continue;
1499                         if(XGetTransientForHint(dpy, wins[i], &d1)
1500                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1501                                 manage(wins[i], &wa);
1502                 }
1503         }
1504         if(wins)
1505                 XFree(wins);
1506 }
1507
1508 static void
1509 setup(void) {
1510         int i, j;
1511         unsigned int mask;
1512         Window w;
1513         XModifierKeymap *modmap;
1514         XSetWindowAttributes wa;
1515
1516         /* init atoms */
1517         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1518         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1519         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1520         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1521         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1522         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1523         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1524                         PropModeReplace, (unsigned char *) netatom, NetLast);
1525         /* init cursors */
1526         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1527         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1528         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1529         /* init modifier map */
1530         modmap = XGetModifierMapping(dpy);
1531         for (i = 0; i < 8; i++)
1532                 for (j = 0; j < modmap->max_keypermod; j++) {
1533                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1534                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
1535                                 numlockmask = (1 << i);
1536                 }
1537         XFreeModifiermap(modmap);
1538         /* select for events */
1539         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1540                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1541         wa.cursor = cursor[CurNormal];
1542         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1543         XSelectInput(dpy, root, wa.event_mask);
1544         keypress(NULL); /* grabkeys */
1545         compileregs();
1546         for(ntags = 0; tags[ntags]; ntags++);
1547         seltags = emallocz(sizeof(Bool) * ntags);
1548         seltags[0] = True;
1549         /* geometry */
1550         sx = sy = 0;
1551         sw = DisplayWidth(dpy, screen);
1552         sh = DisplayHeight(dpy, screen);
1553         initstyle();
1554         initlayouts();
1555         initbar();
1556         /* multihead support */
1557         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
1558 }
1559
1560 /*
1561  * Startup Error handler to check if another window manager
1562  * is already running.
1563  */
1564 static int
1565 xerrorstart(Display *dsply, XErrorEvent *ee) {
1566         otherwm = True;
1567         return -1;
1568 }
1569
1570 static Bool
1571 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
1572         char **list = NULL;
1573         int n;
1574         XTextProperty name;
1575
1576         if(!text || size == 0)
1577                 return False;
1578         text[0] = '\0';
1579         XGetTextProperty(dpy, w, &name, atom);
1580         if(!name.nitems)
1581                 return False;
1582         if(name.encoding == XA_STRING)
1583                 strncpy(text, (char *)name.value, size - 1);
1584         else {
1585                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
1586                 && n > 0 && *list)
1587                 {
1588                         strncpy(text, *list, size - 1);
1589                         XFreeStringList(list);
1590                 }
1591         }
1592         text[size - 1] = '\0';
1593         XFree(name.value);
1594         return True;
1595 }
1596
1597 static void
1598 quit(const char *arg) {
1599         readin = running = False;
1600 }
1601
1602 /* There's no way to check accesses to destroyed windows, thus those cases are
1603  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1604  * default error handler, which may call exit.
1605  */
1606 static int
1607 xerror(Display *dpy, XErrorEvent *ee) {
1608         if(ee->error_code == BadWindow
1609         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1610         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1611         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1612         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1613         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1614         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1615         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1616                 return 0;
1617         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1618                 ee->request_code, ee->error_code);
1619         return xerrorxlib(dpy, ee); /* may call exit */
1620 }
1621
1622 static void
1623 arrange(void) {
1624         Client *c;
1625
1626         for(c = clients; c; c = c->next)
1627                 if(isvisible(c))
1628                         unban(c);
1629                 else
1630                         ban(c);
1631         layouts[ltidx].arrange();
1632         focus(NULL);
1633         restack();
1634 }
1635
1636 static void
1637 attach(Client *c) {
1638         if(clients)
1639                 clients->prev = c;
1640         c->next = clients;
1641         clients = c;
1642 }
1643
1644 static void
1645 detach(Client *c) {
1646         if(c->prev)
1647                 c->prev->next = c->next;
1648         if(c->next)
1649                 c->next->prev = c->prev;
1650         if(c == clients)
1651                 clients = c->next;
1652         c->next = c->prev = NULL;
1653 }
1654
1655 static void
1656 focus(Client *c) {
1657         if((!c && selscreen) || (c && !isvisible(c)))
1658                 for(c = stack; c && !isvisible(c); c = c->snext);
1659         if(sel && sel != c) {
1660                 grabbuttons(sel, False);
1661                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
1662         }
1663         if(c) {
1664                 detachstack(c);
1665                 attachstack(c);
1666                 grabbuttons(c, True);
1667         }
1668         sel = c;
1669         drawbar();
1670         if(!selscreen)
1671                 return;
1672         if(c) {
1673                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
1674                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1675         }
1676         else
1677                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1678 }
1679
1680 static Bool
1681 isarrange(void (*func)())
1682 {
1683         return func == layouts[ltidx].arrange;
1684 }
1685
1686 static Client *
1687 nexttiled(Client *c) {
1688         for(; c && (c->isfloating || !isvisible(c)); c = c->next);
1689         return c;
1690 }
1691
1692 static void
1693 setmwfact(const char *arg) {
1694         double delta;
1695
1696         if(!isarrange(tile))
1697                 return;
1698         /* arg handling, manipulate mwfact */
1699         if(arg == NULL)
1700                 mwfact = MWFACT;
1701         else if(1 == sscanf(arg, "%lf", &delta)) {
1702                 if(arg[0] != '+' && arg[0] != '-')
1703                         mwfact = delta;
1704                 else
1705                         mwfact += delta;
1706                 if(mwfact < 0.1)
1707                         mwfact = 0.1;
1708                 else if(mwfact > 0.9)
1709                         mwfact = 0.9;
1710         }
1711         arrange();
1712 }
1713
1714 static void
1715 tile(void) {
1716         unsigned int i, n, nx, ny, nw, nh, mw, th;
1717         Client *c;
1718
1719         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
1720                 n++;
1721
1722         /* window geoms */
1723         mw = (n == 1) ? waw : mwfact * waw;
1724         th = (n > 1) ? wah / (n - 1) : 0;
1725         if(n > 1 && th < bh)
1726                 th = wah;
1727
1728         nx = wax;
1729         ny = way;
1730         for(i = 0, c = nexttiled(clients); c; c = nexttiled(c->next), i++) {
1731                 c->ismax = False;
1732                 if(i == 0) { /* master */
1733                         nw = mw - 2 * c->border;
1734                         nh = wah - 2 * c->border;
1735                 }
1736                 else {  /* tile window */
1737                         if(i == 1) {
1738                                 ny = way;
1739                                 nx += mw;
1740                         }
1741                         nw = waw - mw - 2 * c->border;
1742                         if(i + 1 == n) /* remainder */
1743                                 nh = (way + wah) - ny - 2 * c->border;
1744                         else
1745                                 nh = th - 2 * c->border;
1746                 }
1747                 resize(c, nx, ny, nw, nh, RESIZEHINTS);
1748                 if(n > 1 && th != wah)
1749                         ny += nh + 2 * c->border;
1750         }
1751 }
1752
1753 static void
1754 zoom(const char *arg) {
1755         Client *c;
1756
1757         if(!sel || !isarrange(tile) || sel->isfloating)
1758                 return;
1759         if((c = sel) == nexttiled(clients))
1760                 if(!(c = nexttiled(c->next)))
1761                         return;
1762         detach(c);
1763         attach(c);
1764         focus(c);
1765         arrange();
1766 }
1767
1768 int
1769 main(int argc, char *argv[]) {
1770         char *p;
1771         int r, xfd;
1772         fd_set rd;
1773         XEvent ev;
1774
1775         if(argc == 2 && !strcmp("-v", argv[1]))
1776                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
1777         else if(argc != 1)
1778                 eprint("usage: dwm [-v]\n");
1779         setlocale(LC_CTYPE, "");
1780         if(!(dpy = XOpenDisplay(0)))
1781                 eprint("dwm: cannot open display\n");
1782         xfd = ConnectionNumber(dpy);
1783         screen = DefaultScreen(dpy);
1784         root = RootWindow(dpy, screen);
1785         otherwm = False;
1786         XSetErrorHandler(xerrorstart);
1787         /* this causes an error if some other window manager is running */
1788         XSelectInput(dpy, root, SubstructureRedirectMask);
1789         XSync(dpy, False);
1790         if(otherwm)
1791                 eprint("dwm: another window manager is already running\n");
1792
1793         XSync(dpy, False);
1794         XSetErrorHandler(NULL);
1795         xerrorxlib = XSetErrorHandler(xerror);
1796         XSync(dpy, False);
1797         setup();
1798         drawbar();
1799         scan();
1800
1801         /* main event loop, also reads status text from stdin */
1802         XSync(dpy, False);
1803         readin = True;
1804         while(running) {
1805                 FD_ZERO(&rd);
1806                 if(readin)
1807                         FD_SET(STDIN_FILENO, &rd);
1808                 FD_SET(xfd, &rd);
1809                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1810                         if(errno == EINTR)
1811                                 continue;
1812                         eprint("select failed\n");
1813                 }
1814                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1815                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
1816                         case -1:
1817                                 strncpy(stext, strerror(errno), sizeof stext - 1);
1818                                 stext[sizeof stext - 1] = '\0';
1819                                 readin = False;
1820                                 break;
1821                         case 0:
1822                                 strncpy(stext, "EOF", 4);
1823                                 readin = False;
1824                                 break;
1825                         default:
1826                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
1827                                 for(; p >= stext && *p != '\n'; --p);
1828                                 if(p > stext)
1829                                         strncpy(stext, p + 1, sizeof stext);
1830                         }
1831                         drawbar();
1832                 }
1833                 while(XPending(dpy)) {
1834                         XNextEvent(dpy, &ev);
1835                         if(handler[ev.type])
1836                                 (handler[ev.type])(&ev); /* call handler */
1837                 }
1838         }
1839         cleanup();
1840         XCloseDisplay(dpy);
1841         return 0;
1842 }