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 void grabkeys(void);
 133 static unsigned int idxoftag(const char *tag);
 134 static void floating(void); /* default floating layout */
 135 static void applyrules(Client *c);
 136 static void compileregs(void);
 137 static void focusnext(const char *arg);
 138 static void focusprev(const char *arg);
 139 static void initlayouts(void);
 140 static Bool isfloating(void);
 141 static Bool isvisible(Client *c);
 142 static void restack(void);
 143 static void setlayout(const char *arg);
 144 static void tag(const char *arg);
 145 static void togglefloating(const char *arg);
 146 static void togglemax(const char *arg);
 147 static void toggletag(const char *arg);
 148 static void toggleview(const char *arg);
 149 static void view(const char *arg);
 150 static void cleanup(void);
 151 static long getstate(Window w);
 152 static void scan(void);
 153 static void setup(void);
 154 static int xerrorstart(Display *dsply, XErrorEvent *ee);
 155 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 156 static void quit(const char *arg);
 157 static int xerror(Display *dpy, XErrorEvent *ee);
 158 static void arrange(void);
 159 static void attach(Client *c);
 160 static void detach(Client *c);
 161 static void focus(Client *c);
 162 static Bool isarrange(void (*func)());
 163 static Client *nexttiled(Client *c);
 164 static void setmwfact(const char *arg);
 165 static void tile(void);
 166 static void zoom(const char *arg);
 167
 168 #include "config.h"
 169
 170 /* variables */
 171 static char stext[256];
 172 static double mwfact = MWFACT;
 173 static int screen, sx, sy, sw, sh, wax, way, waw, wah;
 174 static int (*xerrorxlib)(Display *, XErrorEvent *);
 175 static unsigned int bh;
 176 static unsigned int blw = 0;
 177 static unsigned int bpos = BARPOS;
 178 static unsigned int ltidx = 0; /* default */
 179 static unsigned int nlayouts = 0;
 180 static unsigned int nrules = 0;
 181 static unsigned int ntags;
 182 static unsigned int numlockmask = 0;
 183 static void (*handler[LASTEvent]) (XEvent *) = {
 184         [ButtonPress] = buttonpress,
 185         [ConfigureRequest] = configurerequest,
 186         [ConfigureNotify] = configurenotify,
 187         [DestroyNotify] = destroynotify,
 188         [EnterNotify] = enternotify,
 189         [LeaveNotify] = leavenotify,
 190         [Expose] = expose,
 191         [KeyPress] = keypress,
 192         [MappingNotify] = mappingnotify,
 193         [MapRequest] = maprequest,
 194         [PropertyNotify] = propertynotify,
 195         [UnmapNotify] = unmapnotify
 196 };
 197 static Atom wmatom[WMLast], netatom[NetLast];
 198 static Bool otherwm, readin;
 199 static Bool running = True;
 200 static Bool *seltags;
 201 static Bool selscreen = True;
 202 static Client *clients = NULL;
 203 static Client *sel = NULL;
 204 static Client *stack = NULL;
 205 static Cursor cursor[CurLast];
 206 static Display *dpy;
 207 static DC dc = {0};
 208 static Window barwin, root;
 209 static Regs *regs = NULL;
 210
 211 static void
 212 eprint(const char *errstr, ...) {
 213         va_list ap;
 214
 215         va_start(ap, errstr);
 216         vfprintf(stderr, errstr, ap);
 217         va_end(ap);
 218         exit(EXIT_FAILURE);
 219 }
 220
 221 static void *
 222 emallocz(unsigned int size) {
 223         void *res = calloc(1, size);
 224
 225         if(!res)
 226                 eprint("fatal: could not malloc() %u bytes\n", size);
 227         return res;
 228 }
 229
 230 static void
 231 spawn(const char *arg) {
 232         static char *shell = NULL;
 233
 234         if(!shell && !(shell = getenv("SHELL")))
 235                 shell = "/bin/sh";
 236         if(!arg)
 237                 return;
 238         /* The double-fork construct avoids zombie processes and keeps the code
 239          * clean from stupid signal handlers. */
 240         if(fork() == 0) {
 241                 if(fork() == 0) {
 242                         if(dpy)
 243                                 close(ConnectionNumber(dpy));
 244                         setsid();
 245                         execl(shell, shell, "-c", arg, (char *)NULL);
 246                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
 247                         perror(" failed");
 248                 }
 249                 exit(0);
 250         }
 251         wait(0);
 252 }
 253
 254 static void
 255 drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) {
 256         int x;
 257         XGCValues gcv;
 258         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 259
 260         gcv.foreground = col[ColFG];
 261         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 262         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 263         r.x = dc.x + 1;
 264         r.y = dc.y + 1;
 265         if(filled) {
 266                 r.width = r.height = x + 1;
 267                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 268         }
 269         else if(empty) {
 270                 r.width = r.height = x;
 271                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 272         }
 273 }
 274
 275 static unsigned long
 276 initcolor(const char *colstr) {
 277         Colormap cmap = DefaultColormap(dpy, screen);
 278         XColor color;
 279
 280         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 281                 eprint("error, cannot allocate color '%s'\n", colstr);
 282         return color.pixel;
 283 }
 284
 285 static void
 286 initfont(const char *fontstr) {
 287         char *def, **missing;
 288         int i, n;
 289
 290         missing = NULL;
 291         if(dc.font.set)
 292                 XFreeFontSet(dpy, dc.font.set);
 293         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 294         if(missing) {
 295                 while(n--)
 296                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 297                 XFreeStringList(missing);
 298         }
 299         if(dc.font.set) {
 300                 XFontSetExtents *font_extents;
 301                 XFontStruct **xfonts;
 302                 char **font_names;
 303                 dc.font.ascent = dc.font.descent = 0;
 304                 font_extents = XExtentsOfFontSet(dc.font.set);
 305                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 306                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 307                         if(dc.font.ascent < (*xfonts)->ascent)
 308                                 dc.font.ascent = (*xfonts)->ascent;
 309                         if(dc.font.descent < (*xfonts)->descent)
 310                                 dc.font.descent = (*xfonts)->descent;
 311                         xfonts++;
 312                 }
 313         }
 314         else {
 315                 if(dc.font.xfont)
 316                         XFreeFont(dpy, dc.font.xfont);
 317                 dc.font.xfont = NULL;
 318                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 319                 || !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 320                         eprint("error, cannot load font: '%s'\n", fontstr);
 321                 dc.font.ascent = dc.font.xfont->ascent;
 322                 dc.font.descent = dc.font.xfont->descent;
 323         }
 324         dc.font.height = dc.font.ascent + dc.font.descent;
 325 }
 326
 327 static Bool
 328 isoccupied(unsigned int t) {
 329         Client *c;
 330
 331         for(c = clients; c; c = c->next)
 332                 if(c->tags[t])
 333                         return True;
 334         return False;
 335 }
 336
 337 static unsigned int
 338 textnw(const char *text, unsigned int len) {
 339         XRectangle r;
 340
 341         if(dc.font.set) {
 342                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
 343                 return r.width;
 344         }
 345         return XTextWidth(dc.font.xfont, text, len);
 346 }
 347
 348 static void
 349 drawtext(const char *text, unsigned long col[ColLast]) {
 350         int x, y, w, h;
 351         static char buf[256];
 352         unsigned int len, olen;
 353         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 354
 355         XSetForeground(dpy, dc.gc, col[ColBG]);
 356         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 357         if(!text)
 358                 return;
 359         w = 0;
 360         olen = len = strlen(text);
 361         if(len >= sizeof buf)
 362                 len = sizeof buf - 1;
 363         memcpy(buf, text, len);
 364         buf[len] = 0;
 365         h = dc.font.ascent + dc.font.descent;
 366         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 367         x = dc.x + (h / 2);
 368         /* shorten text if necessary */
 369         while(len && (w = textnw(buf, len)) > dc.w - h)
 370                 buf[--len] = 0;
 371         if(len < olen) {
 372                 if(len > 1)
 373                         buf[len - 1] = '.';
 374                 if(len > 2)
 375                         buf[len - 2] = '.';
 376                 if(len > 3)
 377                         buf[len - 3] = '.';
 378         }
 379         if(w > dc.w)
 380                 return; /* too long */
 381         XSetForeground(dpy, dc.gc, col[ColFG]);
 382         if(dc.font.set)
 383                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 384         else
 385                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 386 }
 387
 388 static void
 389 drawbar(void) {
 390         int i, x;
 391
 392         dc.x = dc.y = 0;
 393         for(i = 0; i < ntags; i++) {
 394                 dc.w = textw(tags[i]);
 395                 if(seltags[i]) {
 396                         drawtext(tags[i], dc.sel);
 397                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel);
 398                 }
 399                 else {
 400                         drawtext(tags[i], dc.norm);
 401                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm);
 402                 }
 403                 dc.x += dc.w;
 404         }
 405         dc.w = blw;
 406         drawtext(layouts[ltidx].symbol, dc.norm);
 407         x = dc.x + dc.w;
 408         dc.w = textw(stext);
 409         dc.x = sw - dc.w;
 410         if(dc.x < x) {
 411                 dc.x = x;
 412                 dc.w = sw - x;
 413         }
 414         drawtext(stext, dc.norm);
 415         if((dc.w = dc.x - x) > bh) {
 416                 dc.x = x;
 417                 if(sel) {
 418                         drawtext(sel->name, dc.sel);
 419                         drawsquare(sel->ismax, sel->isfloating, dc.sel);
 420                 }
 421                 else
 422                         drawtext(NULL, dc.norm);
 423         }
 424         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 425         XSync(dpy, False);
 426 }
 427
 428 static void
 429 initstyle(void) {
 430         dc.norm[ColBorder] = initcolor(NORMBORDERCOLOR);
 431         dc.norm[ColBG] = initcolor(NORMBGCOLOR);
 432         dc.norm[ColFG] = initcolor(NORMFGCOLOR);
 433         dc.sel[ColBorder] = initcolor(SELBORDERCOLOR);
 434         dc.sel[ColBG] = initcolor(SELBGCOLOR);
 435         dc.sel[ColFG] = initcolor(SELFGCOLOR);
 436         initfont(FONT);
 437         dc.h = bh = dc.font.height + 2;
 438 }
 439
 440 static void
 441 initbar(void) {
 442         XSetWindowAttributes wa;
 443
 444         wa.override_redirect = 1;
 445         wa.background_pixmap = ParentRelative;
 446         wa.event_mask = ButtonPressMask | ExposureMask;
 447         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
 448                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
 449                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
 450         XDefineCursor(dpy, barwin, cursor[CurNormal]);
 451         updatebarpos();
 452         XMapRaised(dpy, barwin);
 453         strcpy(stext, "dwm-"VERSION);
 454         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 455         dc.gc = XCreateGC(dpy, root, 0, 0);
 456         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
 457         if(!dc.font.set)
 458                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 459 }
 460
 461 static unsigned int
 462 textw(const char *text) {
 463         return textnw(text, strlen(text)) + dc.font.height;
 464 }
 465
 466 static void
 467 togglebar(const char *arg) {
 468         if(bpos == BarOff)
 469                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
 470         else
 471                 bpos = BarOff;
 472         updatebarpos();
 473         arrange();
 474 }
 475
 476 static void
 477 updatebarpos(void) {
 478         XEvent ev;
 479
 480         wax = sx;
 481         way = sy;
 482         wah = sh;
 483         waw = sw;
 484         switch(bpos) {
 485         default:
 486                 wah -= bh;
 487                 way += bh;
 488                 XMoveWindow(dpy, barwin, sx, sy);
 489                 break;
 490         case BarBot:
 491                 wah -= bh;
 492                 XMoveWindow(dpy, barwin, sx, sy + wah);
 493                 break;
 494         case BarOff:
 495                 XMoveWindow(dpy, barwin, sx, sy - bh);
 496                 break;
 497         }
 498         XSync(dpy, False);
 499         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 500 }
 501
 502 static void
 503 attachstack(Client *c) {
 504         c->snext = stack;
 505         stack = c;
 506 }
 507
 508 static void
 509 detachstack(Client *c) {
 510         Client **tc;
 511
 512         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 513         *tc = c->snext;
 514 }
 515
 516 static void
 517 grabbuttons(Client *c, Bool focused) {
 518         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 519
 520         if(focused) {
 521                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 522                                 GrabModeAsync, GrabModeSync, None, None);
 523                 XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
 524                                 GrabModeAsync, GrabModeSync, None, None);
 525                 XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 526                                 GrabModeAsync, GrabModeSync, None, None);
 527                 XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 528                                 GrabModeAsync, GrabModeSync, None, None);
 529
 530                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 531                                 GrabModeAsync, GrabModeSync, None, None);
 532                 XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
 533                                 GrabModeAsync, GrabModeSync, None, None);
 534                 XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 535                                 GrabModeAsync, GrabModeSync, None, None);
 536                 XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 537                                 GrabModeAsync, GrabModeSync, None, None);
 538
 539                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 540                                 GrabModeAsync, GrabModeSync, None, None);
 541                 XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
 542                                 GrabModeAsync, GrabModeSync, None, None);
 543                 XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 544                                 GrabModeAsync, GrabModeSync, None, None);
 545                 XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 546                                 GrabModeAsync, GrabModeSync, None, None);
 547         }
 548         else
 549                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 550                                 GrabModeAsync, GrabModeSync, None, None);
 551 }
 552
 553 static Bool
 554 isprotodel(Client *c) {
 555         int i, n;
 556         Atom *protocols;
 557         Bool ret = False;
 558
 559         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 560                 for(i = 0; !ret && i < n; i++)
 561                         if(protocols[i] == wmatom[WMDelete])
 562                                 ret = True;
 563                 XFree(protocols);
 564         }
 565         return ret;
 566 }
 567
 568 static void
 569 setclientstate(Client *c, long state) {
 570         long data[] = {state, None};
 571
 572         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
 573                         PropModeReplace, (unsigned char *)data, 2);
 574 }
 575
 576 static int
 577 xerrordummy(Display *dsply, XErrorEvent *ee) {
 578         return 0;
 579 }
 580
 581 static void
 582 ban(Client *c) {
 583         if(c->isbanned)
 584                 return;
 585         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 586         c->isbanned = True;
 587 }
 588
 589 static void
 590 configure(Client *c) {
 591         XConfigureEvent ce;
 592
 593         ce.type = ConfigureNotify;
 594         ce.display = dpy;
 595         ce.event = c->win;
 596         ce.window = c->win;
 597         ce.x = c->x;
 598         ce.y = c->y;
 599         ce.width = c->w;
 600         ce.height = c->h;
 601         ce.border_width = c->border;
 602         ce.above = None;
 603         ce.override_redirect = False;
 604         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 605 }
 606
 607 static void
 608 killclient(const char *arg) {
 609         XEvent ev;
 610
 611         if(!sel)
 612                 return;
 613         if(isprotodel(sel)) {
 614                 ev.type = ClientMessage;
 615                 ev.xclient.window = sel->win;
 616                 ev.xclient.message_type = wmatom[WMProtocols];
 617                 ev.xclient.format = 32;
 618                 ev.xclient.data.l[0] = wmatom[WMDelete];
 619                 ev.xclient.data.l[1] = CurrentTime;
 620                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 621         }
 622         else
 623                 XKillClient(dpy, sel->win);
 624 }
 625
 626 static void
 627 manage(Window w, XWindowAttributes *wa) {
 628         unsigned int i;
 629         Client *c, *t = NULL;
 630         Window trans;
 631         Status rettrans;
 632         XWindowChanges wc;
 633
 634         c = emallocz(sizeof(Client));
 635         c->tags = emallocz(ntags * sizeof(Bool));
 636         c->win = w;
 637         c->x = wa->x;
 638         c->y = wa->y;
 639         c->w = wa->width;
 640         c->h = wa->height;
 641         c->oldborder = wa->border_width;
 642         if(c->w == sw && c->h == sh) {
 643                 c->x = sx;
 644                 c->y = sy;
 645                 c->border = wa->border_width;
 646         }
 647         else {
 648                 if(c->x + c->w + 2 * c->border > wax + waw)
 649                         c->x = wax + waw - c->w - 2 * c->border;
 650                 if(c->y + c->h + 2 * c->border > way + wah)
 651                         c->y = way + wah - c->h - 2 * c->border;
 652                 if(c->x < wax)
 653                         c->x = wax;
 654                 if(c->y < way)
 655                         c->y = way;
 656                 c->border = BORDERPX;
 657         }
 658         wc.border_width = c->border;
 659         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 660         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
 661         configure(c); /* propagates border_width, if size doesn't change */
 662         updatesizehints(c);
 663         XSelectInput(dpy, w,
 664                 StructureNotifyMask | PropertyChangeMask | EnterWindowMask);
 665         grabbuttons(c, False);
 666         updatetitle(c);
 667         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
 668                 for(t = clients; t && t->win != trans; t = t->next);
 669         if(t)
 670                 for(i = 0; i < ntags; i++)
 671                         c->tags[i] = t->tags[i];
 672         applyrules(c);
 673         if(!c->isfloating)
 674                 c->isfloating = (rettrans == Success) || c->isfixed;
 675         attach(c);
 676         attachstack(c);
 677         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
 678         ban(c);
 679         XMapWindow(dpy, c->win);
 680         setclientstate(c, NormalState);
 681         arrange();
 682 }
 683
 684 static void
 685 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
 686         double dx, dy, max, min, ratio;
 687         XWindowChanges wc;
 688
 689         if(sizehints) {
 690                 if(c->minay > 0 && c->maxay > 0 && (h - c->baseh) > 0 && (w - c->basew) > 0) {
 691                         dx = (double)(w - c->basew);
 692                         dy = (double)(h - c->baseh);
 693                         min = (double)(c->minax) / (double)(c->minay);
 694                         max = (double)(c->maxax) / (double)(c->maxay);
 695                         ratio = dx / dy;
 696                         if(max > 0 && min > 0 && ratio > 0) {
 697                                 if(ratio < min) {
 698                                         dy = (dx * min + dy) / (min * min + 1);
 699                                         dx = dy * min;
 700                                         w = (int)dx + c->basew;
 701                                         h = (int)dy + c->baseh;
 702                                 }
 703                                 else if(ratio > max) {
 704                                         dy = (dx * min + dy) / (max * max + 1);
 705                                         dx = dy * min;
 706                                         w = (int)dx + c->basew;
 707                                         h = (int)dy + c->baseh;
 708                                 }
 709                         }
 710                 }
 711                 if(c->minw && w < c->minw)
 712                         w = c->minw;
 713                 if(c->minh && h < c->minh)
 714                         h = c->minh;
 715                 if(c->maxw && w > c->maxw)
 716                         w = c->maxw;
 717                 if(c->maxh && h > c->maxh)
 718                         h = c->maxh;
 719                 if(c->incw)
 720                         w -= (w - c->basew) % c->incw;
 721                 if(c->inch)
 722                         h -= (h - c->baseh) % c->inch;
 723         }
 724         if(w <= 0 || h <= 0)
 725                 return;
 726         /* offscreen appearance fixes */
 727         if(x > sw)
 728                 x = sw - w - 2 * c->border;
 729         if(y > sh)
 730                 y = sh - h - 2 * c->border;
 731         if(x + w + 2 * c->border < sx)
 732                 x = sx;
 733         if(y + h + 2 * c->border < sy)
 734                 y = sy;
 735         if(c->x != x || c->y != y || c->w != w || c->h != h) {
 736                 c->x = wc.x = x;
 737                 c->y = wc.y = y;
 738                 c->w = wc.width = w;
 739                 c->h = wc.height = h;
 740                 wc.border_width = c->border;
 741                 XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
 742                 configure(c);
 743                 XSync(dpy, False);
 744         }
 745 }
 746
 747 static void
 748 unban(Client *c) {
 749         if(!c->isbanned)
 750                 return;
 751         XMoveWindow(dpy, c->win, c->x, c->y);
 752         c->isbanned = False;
 753 }
 754
 755 static void
 756 unmanage(Client *c) {
 757         XWindowChanges wc;
 758
 759         wc.border_width = c->oldborder;
 760         /* The server grab construct avoids race conditions. */
 761         XGrabServer(dpy);
 762         XSetErrorHandler(xerrordummy);
 763         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
 764         detach(c);
 765         detachstack(c);
 766         if(sel == c)
 767                 focus(NULL);
 768         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 769         setclientstate(c, WithdrawnState);
 770         free(c->tags);
 771         free(c);
 772         XSync(dpy, False);
 773         XSetErrorHandler(xerror);
 774         XUngrabServer(dpy);
 775         arrange();
 776 }
 777
 778 static void
 779 updatesizehints(Client *c) {
 780         long msize;
 781         XSizeHints size;
 782
 783         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
 784                 size.flags = PSize;
 785         c->flags = size.flags;
 786         if(c->flags & PBaseSize) {
 787                 c->basew = size.base_width;
 788                 c->baseh = size.base_height;
 789         }
 790         else if(c->flags & PMinSize) {
 791                 c->basew = size.min_width;
 792                 c->baseh = size.min_height;
 793         }
 794         else
 795                 c->basew = c->baseh = 0;
 796         if(c->flags & PResizeInc) {
 797                 c->incw = size.width_inc;
 798                 c->inch = size.height_inc;
 799         }
 800         else
 801                 c->incw = c->inch = 0;
 802         if(c->flags & PMaxSize) {
 803                 c->maxw = size.max_width;
 804                 c->maxh = size.max_height;
 805         }
 806         else
 807                 c->maxw = c->maxh = 0;
 808         if(c->flags & PMinSize) {
 809                 c->minw = size.min_width;
 810                 c->minh = size.min_height;
 811         }
 812         else if(c->flags & PBaseSize) {
 813                 c->minw = size.base_width;
 814                 c->minh = size.base_height;
 815         }
 816         else
 817                 c->minw = c->minh = 0;
 818         if(c->flags & PAspect) {
 819                 c->minax = size.min_aspect.x;
 820                 c->maxax = size.max_aspect.x;
 821                 c->minay = size.min_aspect.y;
 822                 c->maxay = size.max_aspect.y;
 823         }
 824         else
 825                 c->minax = c->maxax = c->minay = c->maxay = 0;
 826         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
 827                         && c->maxw == c->minw && c->maxh == c->minh);
 828 }
 829
 830 static void
 831 updatetitle(Client *c) {
 832         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
 833                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
 834 }
 835
 836 static Client *
 837 getclient(Window w) {
 838         Client *c;
 839
 840         for(c = clients; c && c->win != w; c = c->next);
 841         return c;
 842 }
 843
 844 static void
 845 movemouse(Client *c) {
 846         int x1, y1, ocx, ocy, di, nx, ny;
 847         unsigned int dui;
 848         Window dummy;
 849         XEvent ev;
 850
 851         ocx = nx = c->x;
 852         ocy = ny = c->y;
 853         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 854                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
 855                 return;
 856         c->ismax = False;
 857         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
 858         for(;;) {
 859                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
 860                 switch (ev.type) {
 861                 case ButtonRelease:
 862                         XUngrabPointer(dpy, CurrentTime);
 863                         return;
 864                 case ConfigureRequest:
 865                 case Expose:
 866                 case MapRequest:
 867                         handler[ev.type](&ev);
 868                         break;
 869                 case MotionNotify:
 870                         XSync(dpy, False);
 871                         nx = ocx + (ev.xmotion.x - x1);
 872                         ny = ocy + (ev.xmotion.y - y1);
 873                         if(abs(wax + nx) < SNAP)
 874                                 nx = wax;
 875                         else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
 876                                 nx = wax + waw - c->w - 2 * c->border;
 877                         if(abs(way - ny) < SNAP)
 878                                 ny = way;
 879                         else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
 880                                 ny = way + wah - c->h - 2 * c->border;
 881                         resize(c, nx, ny, c->w, c->h, False);
 882                         break;
 883                 }
 884         }
 885 }
 886
 887 static void
 888 resizemouse(Client *c) {
 889         int ocx, ocy;
 890         int nw, nh;
 891         XEvent ev;
 892
 893         ocx = c->x;
 894         ocy = c->y;
 895         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 896                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
 897                 return;
 898         c->ismax = False;
 899         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
 900         for(;;) {
 901                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
 902                 switch(ev.type) {
 903                 case ButtonRelease:
 904                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
 905                                         c->w + c->border - 1, c->h + c->border - 1);
 906                         XUngrabPointer(dpy, CurrentTime);
 907                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 908                         return;
 909                 case ConfigureRequest:
 910                 case Expose:
 911                 case MapRequest:
 912                         handler[ev.type](&ev);
 913                         break;
 914                 case MotionNotify:
 915                         XSync(dpy, False);
 916                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
 917                                 nw = 1;
 918                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
 919                                 nh = 1;
 920                         resize(c, c->x, c->y, nw, nh, True);
 921                         break;
 922                 }
 923         }
 924 }
 925
 926 static void
 927 buttonpress(XEvent *e) {
 928         unsigned int i, x;
 929         Client *c;
 930         XButtonPressedEvent *ev = &e->xbutton;
 931
 932         if(barwin == ev->window) {
 933                 x = 0;
 934                 for(i = 0; i < ntags; i++) {
 935                         x += textw(tags[i]);
 936                         if(ev->x < x) {
 937                                 if(ev->button == Button1) {
 938                                         if(ev->state & MODKEY)
 939                                                 tag(tags[i]);
 940                                         else
 941                                                 view(tags[i]);
 942                                 }
 943                                 else if(ev->button == Button3) {
 944                                         if(ev->state & MODKEY)
 945                                                 toggletag(tags[i]);
 946                                         else
 947                                                 toggleview(tags[i]);
 948                                 }
 949                                 return;
 950                         }
 951                 }
 952                 if((ev->x < x + blw) && ev->button == Button1)
 953                         setlayout(NULL);
 954         }
 955         else if((c = getclient(ev->window))) {
 956                 focus(c);
 957                 if(CLEANMASK(ev->state) != MODKEY)
 958                         return;
 959                 if(ev->button == Button1 && (isfloating() || c->isfloating)) {
 960                         restack();
 961                         movemouse(c);
 962                 }
 963                 else if(ev->button == Button2)
 964                         zoom(NULL);
 965                 else if(ev->button == Button3
 966                 && (isfloating() || c->isfloating) && !c->isfixed)
 967                 {
 968                         restack();
 969                         resizemouse(c);
 970                 }
 971         }
 972 }
 973
 974 static void
 975 configurerequest(XEvent *e) {
 976         Client *c;
 977         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 978         XWindowChanges wc;
 979
 980         if((c = getclient(ev->window))) {
 981                 c->ismax = False;
 982                 if(ev->value_mask & CWBorderWidth)
 983                         c->border = ev->border_width;
 984                 if(c->isfixed || c->isfloating || isfloating()) {
 985                         if(ev->value_mask & CWX)
 986                                 c->x = ev->x;
 987                         if(ev->value_mask & CWY)
 988                                 c->y = ev->y;
 989                         if(ev->value_mask & CWWidth)
 990                                 c->w = ev->width;
 991                         if(ev->value_mask & CWHeight)
 992                                 c->h = ev->height;
 993                         if((c->x + c->w) > sw && c->isfloating)
 994                                 c->x = sw / 2 - c->w / 2; /* center in x direction */
 995                         if((c->y + c->h) > sh && c->isfloating)
 996                                 c->y = sh / 2 - c->h / 2; /* center in y direction */
 997                         if((ev->value_mask & (CWX | CWY))
 998                         && !(ev->value_mask & (CWWidth | CWHeight)))
 999                                 configure(c);
1000                         if(isvisible(c))
1001                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
1002                 }
1003                 else
1004                         configure(c);
1005         }
1006         else {
1007                 wc.x = ev->x;
1008                 wc.y = ev->y;
1009                 wc.width = ev->width;
1010                 wc.height = ev->height;
1011                 wc.border_width = ev->border_width;
1012                 wc.sibling = ev->above;
1013                 wc.stack_mode = ev->detail;
1014                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
1015         }
1016         XSync(dpy, False);
1017 }
1018
1019 static void
1020 configurenotify(XEvent *e) {
1021         XConfigureEvent *ev = &e->xconfigure;
1022
1023         if (ev->window == root && (ev->width != sw || ev->height != sh)) {
1024                 sw = ev->width;
1025                 sh = ev->height;
1026                 XFreePixmap(dpy, dc.drawable);
1027                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
1028                 XResizeWindow(dpy, barwin, sw, bh);
1029                 updatebarpos();
1030                 arrange();
1031         }
1032 }
1033
1034 static void
1035 destroynotify(XEvent *e) {
1036         Client *c;
1037         XDestroyWindowEvent *ev = &e->xdestroywindow;
1038
1039         if((c = getclient(ev->window)))
1040                 unmanage(c);
1041 }
1042
1043 static void
1044 enternotify(XEvent *e) {
1045         Client *c;
1046         XCrossingEvent *ev = &e->xcrossing;
1047
1048         if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
1049                 return;
1050         if((c = getclient(ev->window)))
1051                 focus(c);
1052         else if(ev->window == root) {
1053                 selscreen = True;
1054                 focus(NULL);
1055         }
1056 }
1057
1058 static void
1059 expose(XEvent *e) {
1060         XExposeEvent *ev = &e->xexpose;
1061
1062         if(ev->count == 0) {
1063                 if(barwin == ev->window)
1064                         drawbar();
1065         }
1066 }
1067
1068 static void
1069 keypress(XEvent *e) {
1070         KEYS
1071         unsigned int len = sizeof keys / sizeof keys[0];
1072         unsigned int i;
1073         KeySym keysym;
1074         XKeyEvent *ev = &e->xkey;
1075
1076         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
1077         for(i = 0; i < len; i++)
1078                 if(keysym == keys[i].keysym
1079                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
1080                 {
1081                         if(keys[i].func)
1082                                 keys[i].func(keys[i].arg);
1083                 }
1084 }
1085
1086 static void
1087 leavenotify(XEvent *e) {
1088         XCrossingEvent *ev = &e->xcrossing;
1089
1090         if((ev->window == root) && !ev->same_screen) {
1091                 selscreen = False;
1092                 focus(NULL);
1093         }
1094 }
1095
1096 static void
1097 mappingnotify(XEvent *e) {
1098         XMappingEvent *ev = &e->xmapping;
1099
1100         XRefreshKeyboardMapping(ev);
1101         if(ev->request == MappingKeyboard)
1102                 grabkeys();
1103 }
1104
1105 static void
1106 maprequest(XEvent *e) {
1107         static XWindowAttributes wa;
1108         XMapRequestEvent *ev = &e->xmaprequest;
1109
1110         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1111                 return;
1112         if(wa.override_redirect)
1113                 return;
1114         if(!getclient(ev->window))
1115                 manage(ev->window, &wa);
1116 }
1117
1118 static void
1119 propertynotify(XEvent *e) {
1120         Client *c;
1121         Window trans;
1122         XPropertyEvent *ev = &e->xproperty;
1123
1124         if(ev->state == PropertyDelete)
1125                 return; /* ignore */
1126         if((c = getclient(ev->window))) {
1127                 switch (ev->atom) {
1128                         default: break;
1129                         case XA_WM_TRANSIENT_FOR:
1130                                 XGetTransientForHint(dpy, c->win, &trans);
1131                                 if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1132                                         arrange();
1133                                 break;
1134                         case XA_WM_NORMAL_HINTS:
1135                                 updatesizehints(c);
1136                                 break;
1137                 }
1138                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1139                         updatetitle(c);
1140                         if(c == sel)
1141                                 drawbar();
1142                 }
1143         }
1144 }
1145
1146 static void
1147 unmapnotify(XEvent *e) {
1148         Client *c;
1149         XUnmapEvent *ev = &e->xunmap;
1150
1151         if((c = getclient(ev->window)))
1152                 unmanage(c);
1153 }
1154
1155 static void
1156 grabkeys(void) {
1157         KEYS
1158         unsigned int len = sizeof keys / sizeof keys[0];
1159         unsigned int i;
1160         KeyCode code;
1161
1162         XUngrabKey(dpy, AnyKey, AnyModifier, root);
1163         for(i = 0; i < len; i++) {
1164                 code = XKeysymToKeycode(dpy, keys[i].keysym);
1165                 XGrabKey(dpy, code, keys[i].mod, root, True,
1166                                 GrabModeAsync, GrabModeAsync);
1167                 XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
1168                                 GrabModeAsync, GrabModeAsync);
1169                 XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
1170                                 GrabModeAsync, GrabModeAsync);
1171                 XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
1172                                 GrabModeAsync, GrabModeAsync);
1173         }
1174 }
1175
1176 static unsigned int
1177 idxoftag(const char *tag) {
1178         unsigned int i;
1179
1180         for(i = 0; i < ntags; i++)
1181                 if(tags[i] == tag)
1182                         return i;
1183         return 0;
1184 }
1185
1186 static void
1187 floating(void) { /* default floating layout */
1188         Client *c;
1189
1190         for(c = clients; c; c = c->next)
1191                 if(isvisible(c))
1192                         resize(c, c->x, c->y, c->w, c->h, True);
1193 }
1194
1195 static void
1196 applyrules(Client *c) {
1197         static char buf[512];
1198         unsigned int i, j;
1199         regmatch_t tmp;
1200         Bool matched = False;
1201         XClassHint ch = { 0 };
1202
1203         /* rule matching */
1204         XGetClassHint(dpy, c->win, &ch);
1205         snprintf(buf, sizeof buf, "%s:%s:%s",
1206                         ch.res_class ? ch.res_class : "",
1207                         ch.res_name ? ch.res_name : "", c->name);
1208         for(i = 0; i < nrules; i++)
1209                 if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
1210                         c->isfloating = rules[i].isfloating;
1211                         for(j = 0; regs[i].tagregex && j < ntags; j++) {
1212                                 if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
1213                                         matched = True;
1214                                         c->tags[j] = True;
1215                                 }
1216                         }
1217                 }
1218         if(ch.res_class)
1219                 XFree(ch.res_class);
1220         if(ch.res_name)
1221                 XFree(ch.res_name);
1222         if(!matched)
1223                 for(i = 0; i < ntags; i++)
1224                         c->tags[i] = seltags[i];
1225 }
1226
1227 static void
1228 compileregs(void) {
1229         unsigned int i;
1230         regex_t *reg;
1231
1232         if(regs)
1233                 return;
1234         nrules = sizeof rules / sizeof rules[0];
1235         regs = emallocz(nrules * sizeof(Regs));
1236         for(i = 0; i < nrules; i++) {
1237                 if(rules[i].prop) {
1238                         reg = emallocz(sizeof(regex_t));
1239                         if(regcomp(reg, rules[i].prop, REG_EXTENDED))
1240                                 free(reg);
1241                         else
1242                                 regs[i].propregex = reg;
1243                 }
1244                 if(rules[i].tags) {
1245                         reg = emallocz(sizeof(regex_t));
1246                         if(regcomp(reg, rules[i].tags, REG_EXTENDED))
1247                                 free(reg);
1248                         else
1249                                 regs[i].tagregex = reg;
1250                 }
1251         }
1252 }
1253
1254 static void
1255 focusnext(const char *arg) {
1256         Client *c;
1257
1258         if(!sel)
1259                 return;
1260         for(c = sel->next; c && !isvisible(c); c = c->next);
1261         if(!c)
1262                 for(c = clients; c && !isvisible(c); c = c->next);
1263         if(c) {
1264                 focus(c);
1265                 restack();
1266         }
1267 }
1268
1269 static void
1270 focusprev(const char *arg) {
1271         Client *c;
1272
1273         if(!sel)
1274                 return;
1275         for(c = sel->prev; c && !isvisible(c); c = c->prev);
1276         if(!c) {
1277                 for(c = clients; c && c->next; c = c->next);
1278                 for(; c && !isvisible(c); c = c->prev);
1279         }
1280         if(c) {
1281                 focus(c);
1282                 restack();
1283         }
1284 }
1285
1286 static void
1287 initlayouts(void) {
1288         unsigned int i, w;
1289
1290         nlayouts = sizeof layouts / sizeof layouts[0];
1291         for(blw = i = 0; i < nlayouts; i++) {
1292                 w = textw(layouts[i].symbol);
1293                 if(w > blw)
1294                         blw = w;
1295         }
1296 }
1297
1298 static Bool
1299 isfloating(void) {
1300         return layouts[ltidx].arrange == floating;
1301 }
1302
1303 static Bool
1304 isvisible(Client *c) {
1305         unsigned int i;
1306
1307         for(i = 0; i < ntags; i++)
1308                 if(c->tags[i] && seltags[i])
1309                         return True;
1310         return False;
1311 }
1312
1313 static void
1314 restack(void) {
1315         Client *c;
1316         XEvent ev;
1317         XWindowChanges wc;
1318
1319         drawbar();
1320         if(!sel)
1321                 return;
1322         if(sel->isfloating || isfloating())
1323                 XRaiseWindow(dpy, sel->win);
1324         if(!isfloating()) {
1325                 wc.stack_mode = Below;
1326                 wc.sibling = barwin;
1327                 if(!sel->isfloating) {
1328                         XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1329                         wc.sibling = sel->win;
1330                 }
1331                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1332                         if(c == sel)
1333                                 continue;
1334                         XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1335                         wc.sibling = c->win;
1336                 }
1337         }
1338         XSync(dpy, False);
1339         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1340 }
1341
1342 static void
1343 setlayout(const char *arg) {
1344         unsigned int i;
1345
1346         if(!arg) {
1347                 if(++ltidx == nlayouts)
1348                         ltidx = 0;;
1349         }
1350         else {
1351                 for(i = 0; i < nlayouts; i++)
1352                         if(!strcmp(arg, layouts[i].symbol))
1353                                 break;
1354                 if(i == nlayouts)
1355                         return;
1356                 ltidx = i;
1357         }
1358         if(sel)
1359                 arrange();
1360         else
1361                 drawbar();
1362 }
1363
1364 static void
1365 tag(const char *arg) {
1366         unsigned int i;
1367
1368         if(!sel)
1369                 return;
1370         for(i = 0; i < ntags; i++)
1371                 sel->tags[i] = arg == NULL;
1372         i = idxoftag(arg);
1373         if(i >= 0 && i < ntags)
1374                 sel->tags[i] = True;
1375         arrange();
1376 }
1377
1378 static void
1379 togglefloating(const char *arg) {
1380         if(!sel)
1381                 return;
1382         sel->isfloating = !sel->isfloating;
1383         if(sel->isfloating)
1384                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1385         arrange();
1386 }
1387
1388 static void
1389 togglemax(const char *arg) {
1390         XEvent ev;
1391
1392         if(!sel || (!isfloating() && !sel->isfloating) || sel->isfixed)
1393                 return;
1394         if((sel->ismax = !sel->ismax)) {
1395                 sel->rx = sel->x;
1396                 sel->ry = sel->y;
1397                 sel->rw = sel->w;
1398                 sel->rh = sel->h;
1399                 resize(sel, wax, way, waw - 2 * sel->border, wah - 2 * sel->border, True);
1400         }
1401         else
1402                 resize(sel, sel->rx, sel->ry, sel->rw, sel->rh, True);
1403         drawbar();
1404         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1405 }
1406
1407 static void
1408 toggletag(const char *arg) {
1409         unsigned int i, j;
1410
1411         if(!sel)
1412                 return;
1413         i = idxoftag(arg);
1414         sel->tags[i] = !sel->tags[i];
1415         for(j = 0; j < ntags && !sel->tags[j]; j++);
1416         if(j == ntags)
1417                 sel->tags[i] = True;
1418         arrange();
1419 }
1420
1421 static void
1422 toggleview(const char *arg) {
1423         unsigned int i, j;
1424
1425         i = idxoftag(arg);
1426         seltags[i] = !seltags[i];
1427         for(j = 0; j < ntags && !seltags[j]; j++);
1428         if(j == ntags)
1429                 seltags[i] = True; /* cannot toggle last view */
1430         arrange();
1431 }
1432
1433 static void
1434 view(const char *arg) {
1435         unsigned int i;
1436
1437         for(i = 0; i < ntags; i++)
1438                 seltags[i] = arg == NULL;
1439         i = idxoftag(arg);
1440         if(i >= 0 && i < ntags)
1441                 seltags[i] = True;
1442         arrange();
1443 }
1444
1445 static void
1446 cleanup(void) {
1447         close(STDIN_FILENO);
1448         while(stack) {
1449                 unban(stack);
1450                 unmanage(stack);
1451         }
1452         if(dc.font.set)
1453                 XFreeFontSet(dpy, dc.font.set);
1454         else
1455                 XFreeFont(dpy, dc.font.xfont);
1456         XUngrabKey(dpy, AnyKey, AnyModifier, root);
1457         XFreePixmap(dpy, dc.drawable);
1458         XFreeGC(dpy, dc.gc);
1459         XDestroyWindow(dpy, barwin);
1460         XFreeCursor(dpy, cursor[CurNormal]);
1461         XFreeCursor(dpy, cursor[CurResize]);
1462         XFreeCursor(dpy, cursor[CurMove]);
1463         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
1464         XSync(dpy, False);
1465         free(seltags);
1466 }
1467
1468 static long
1469 getstate(Window w) {
1470         int format, status;
1471         long result = -1;
1472         unsigned char *p = NULL;
1473         unsigned long n, extra;
1474         Atom real;
1475
1476         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
1477                         &real, &format, &n, &extra, (unsigned char **)&p);
1478         if(status != Success)
1479                 return -1;
1480         if(n != 0)
1481                 result = *p;
1482         XFree(p);
1483         return result;
1484 }
1485
1486 static void
1487 scan(void) {
1488         unsigned int i, num;
1489         Window *wins, d1, d2;
1490         XWindowAttributes wa;
1491
1492         wins = NULL;
1493         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1494                 for(i = 0; i < num; i++) {
1495                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1496                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1497                                 continue;
1498                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1499                                 manage(wins[i], &wa);
1500                 }
1501                 for(i = 0; i < num; i++) { /* now the transients */
1502                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1503                                 continue;
1504                         if(XGetTransientForHint(dpy, wins[i], &d1)
1505                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1506                                 manage(wins[i], &wa);
1507                 }
1508         }
1509         if(wins)
1510                 XFree(wins);
1511 }
1512
1513 static void
1514 setup(void) {
1515         int i, j;
1516         unsigned int mask;
1517         Window w;
1518         XModifierKeymap *modmap;
1519         XSetWindowAttributes wa;
1520
1521         /* init atoms */
1522         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1523         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1524         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1525         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1526         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1527         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1528         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1529                         PropModeReplace, (unsigned char *) netatom, NetLast);
1530         /* init cursors */
1531         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1532         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1533         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1534         /* init modifier map */
1535         modmap = XGetModifierMapping(dpy);
1536         for (i = 0; i < 8; i++)
1537                 for (j = 0; j < modmap->max_keypermod; j++) {
1538                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1539                                         == XKeysymToKeycode(dpy, XK_Num_Lock))
1540                                 numlockmask = (1 << i);
1541                 }
1542         XFreeModifiermap(modmap);
1543         /* select for events */
1544         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1545                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1546         wa.cursor = cursor[CurNormal];
1547         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1548         XSelectInput(dpy, root, wa.event_mask);
1549         grabkeys();
1550         compileregs();
1551         for(ntags = 0; tags[ntags]; ntags++);
1552         seltags = emallocz(sizeof(Bool) * ntags);
1553         seltags[0] = True;
1554         /* geometry */
1555         sx = sy = 0;
1556         sw = DisplayWidth(dpy, screen);
1557         sh = DisplayHeight(dpy, screen);
1558         initstyle();
1559         initlayouts();
1560         initbar();
1561         /* multihead support */
1562         selscreen = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
1563 }
1564
1565 /*
1566  * Startup Error handler to check if another window manager
1567  * is already running.
1568  */
1569 static int
1570 xerrorstart(Display *dsply, XErrorEvent *ee) {
1571         otherwm = True;
1572         return -1;
1573 }
1574
1575 static Bool
1576 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
1577         char **list = NULL;
1578         int n;
1579         XTextProperty name;
1580
1581         if(!text || size == 0)
1582                 return False;
1583         text[0] = '\0';
1584         XGetTextProperty(dpy, w, &name, atom);
1585         if(!name.nitems)
1586                 return False;
1587         if(name.encoding == XA_STRING)
1588                 strncpy(text, (char *)name.value, size - 1);
1589         else {
1590                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
1591                 && n > 0 && *list)
1592                 {
1593                         strncpy(text, *list, size - 1);
1594                         XFreeStringList(list);
1595                 }
1596         }
1597         text[size - 1] = '\0';
1598         XFree(name.value);
1599         return True;
1600 }
1601
1602 static void
1603 quit(const char *arg) {
1604         readin = running = False;
1605 }
1606
1607 /* There's no way to check accesses to destroyed windows, thus those cases are
1608  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1609  * default error handler, which may call exit.
1610  */
1611 static int
1612 xerror(Display *dpy, XErrorEvent *ee) {
1613         if(ee->error_code == BadWindow
1614         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1615         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1616         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1617         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1618         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1619         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1620         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1621                 return 0;
1622         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1623                 ee->request_code, ee->error_code);
1624         return xerrorxlib(dpy, ee); /* may call exit */
1625 }
1626
1627 static void
1628 arrange(void) {
1629         Client *c;
1630
1631         for(c = clients; c; c = c->next)
1632                 if(isvisible(c))
1633                         unban(c);
1634                 else
1635                         ban(c);
1636         layouts[ltidx].arrange();
1637         focus(NULL);
1638         restack();
1639 }
1640
1641 static void
1642 attach(Client *c) {
1643         if(clients)
1644                 clients->prev = c;
1645         c->next = clients;
1646         clients = c;
1647 }
1648
1649 static void
1650 detach(Client *c) {
1651         if(c->prev)
1652                 c->prev->next = c->next;
1653         if(c->next)
1654                 c->next->prev = c->prev;
1655         if(c == clients)
1656                 clients = c->next;
1657         c->next = c->prev = NULL;
1658 }
1659
1660 static void
1661 focus(Client *c) {
1662         if((!c && selscreen) || (c && !isvisible(c)))
1663                 for(c = stack; c && !isvisible(c); c = c->snext);
1664         if(sel && sel != c) {
1665                 grabbuttons(sel, False);
1666                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
1667         }
1668         if(c) {
1669                 detachstack(c);
1670                 attachstack(c);
1671                 grabbuttons(c, True);
1672         }
1673         sel = c;
1674         drawbar();
1675         if(!selscreen)
1676                 return;
1677         if(c) {
1678                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
1679                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1680         }
1681         else
1682                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1683 }
1684
1685 static Bool
1686 isarrange(void (*func)())
1687 {
1688         return func == layouts[ltidx].arrange;
1689 }
1690
1691 static Client *
1692 nexttiled(Client *c) {
1693         for(; c && (c->isfloating || !isvisible(c)); c = c->next);
1694         return c;
1695 }
1696
1697 static void
1698 setmwfact(const char *arg) {
1699         double delta;
1700
1701         if(!isarrange(tile))
1702                 return;
1703         /* arg handling, manipulate mwfact */
1704         if(arg == NULL)
1705                 mwfact = MWFACT;
1706         else if(1 == sscanf(arg, "%lf", &delta)) {
1707                 if(arg[0] != '+' && arg[0] != '-')
1708                         mwfact = delta;
1709                 else
1710                         mwfact += delta;
1711                 if(mwfact < 0.1)
1712                         mwfact = 0.1;
1713                 else if(mwfact > 0.9)
1714                         mwfact = 0.9;
1715         }
1716         arrange();
1717 }
1718
1719 static void
1720 tile(void) {
1721         unsigned int i, n, nx, ny, nw, nh, mw, th;
1722         Client *c;
1723
1724         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
1725                 n++;
1726
1727         /* window geoms */
1728         mw = (n == 1) ? waw : mwfact * waw;
1729         th = (n > 1) ? wah / (n - 1) : 0;
1730         if(n > 1 && th < bh)
1731                 th = wah;
1732
1733         nx = wax;
1734         ny = way;
1735         for(i = 0, c = nexttiled(clients); c; c = nexttiled(c->next), i++) {
1736                 c->ismax = False;
1737                 if(i == 0) { /* master */
1738                         nw = mw - 2 * c->border;
1739                         nh = wah - 2 * c->border;
1740                 }
1741                 else {  /* tile window */
1742                         if(i == 1) {
1743                                 ny = way;
1744                                 nx += mw;
1745                         }
1746                         nw = waw - mw - 2 * c->border;
1747                         if(i + 1 == n) /* remainder */
1748                                 nh = (way + wah) - ny - 2 * c->border;
1749                         else
1750                                 nh = th - 2 * c->border;
1751                 }
1752                 resize(c, nx, ny, nw, nh, RESIZEHINTS);
1753                 if(n > 1 && th != wah)
1754                         ny += nh + 2 * c->border;
1755         }
1756 }
1757
1758 static void
1759 zoom(const char *arg) {
1760         Client *c;
1761
1762         if(!sel || !isarrange(tile) || sel->isfloating)
1763                 return;
1764         if((c = sel) == nexttiled(clients))
1765                 if(!(c = nexttiled(c->next)))
1766                         return;
1767         detach(c);
1768         attach(c);
1769         focus(c);
1770         arrange();
1771 }
1772
1773 int
1774 main(int argc, char *argv[]) {
1775         char *p;
1776         int r, xfd;
1777         fd_set rd;
1778         XEvent ev;
1779
1780         if(argc == 2 && !strcmp("-v", argv[1]))
1781                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
1782         else if(argc != 1)
1783                 eprint("usage: dwm [-v]\n");
1784         setlocale(LC_CTYPE, "");
1785         if(!(dpy = XOpenDisplay(0)))
1786                 eprint("dwm: cannot open display\n");
1787         xfd = ConnectionNumber(dpy);
1788         screen = DefaultScreen(dpy);
1789         root = RootWindow(dpy, screen);
1790         otherwm = False;
1791         XSetErrorHandler(xerrorstart);
1792         /* this causes an error if some other window manager is running */
1793         XSelectInput(dpy, root, SubstructureRedirectMask);
1794         XSync(dpy, False);
1795         if(otherwm)
1796                 eprint("dwm: another window manager is already running\n");
1797
1798         XSync(dpy, False);
1799         XSetErrorHandler(NULL);
1800         xerrorxlib = XSetErrorHandler(xerror);
1801         XSync(dpy, False);
1802         setup();
1803         drawbar();
1804         scan();
1805
1806         /* main event loop, also reads status text from stdin */
1807         XSync(dpy, False);
1808         readin = True;
1809         while(running) {
1810                 FD_ZERO(&rd);
1811                 if(readin)
1812                         FD_SET(STDIN_FILENO, &rd);
1813                 FD_SET(xfd, &rd);
1814                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1815                         if(errno == EINTR)
1816                                 continue;
1817                         eprint("select failed\n");
1818                 }
1819                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1820                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
1821                         case -1:
1822                                 strncpy(stext, strerror(errno), sizeof stext - 1);
1823                                 stext[sizeof stext - 1] = '\0';
1824                                 readin = False;
1825                                 break;
1826                         case 0:
1827                                 strncpy(stext, "EOF", 4);
1828                                 readin = False;
1829                                 break;
1830                         default:
1831                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
1832                                 for(; p >= stext && *p != '\n'; --p);
1833                                 if(p > stext)
1834                                         strncpy(stext, p + 1, sizeof stext);
1835                         }
1836                         drawbar();
1837                 }
1838                 while(XPending(dpy)) {
1839                         XNextEvent(dpy, &ev);
1840                         if(handler[ev.type])
1841                                 (handler[ev.type])(&ev); /* call handler */
1842                 }
1843         }
1844         cleanup();
1845         XCloseDisplay(dpy);
1846         return 0;
1847 }