dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a global
  15  * linked client list, the focus history is remembered through a global
  16  * stack list. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #ifdef XINERAMA
  40 #include <X11/extensions/Xinerama.h>
  41 #endif
  42
  43 /* macros */
  44 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  45 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  46 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  47 #define ISVISIBLE(x)            (x->tags & tagset[seltags])
  48 #define LENGTH(x)               (sizeof x / sizeof x[0])
  49 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
  50 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
  51 #define MAXTAGLEN               16
  52 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  53 #define WIDTH(x)                ((x)->w + 2 * (x)->bw)
  54 #define HEIGHT(x)               ((x)->h + 2 * (x)->bw)
  55 #define TAGMASK                 ((int)((1LL << LENGTH(tags)) - 1))
  56 #define TEXTW(x)                (textnw(x, strlen(x)) + dc.font.height)
  57
  58 /* enums */
  59 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  60 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  61 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  62 enum { WMProtocols, WMDelete, WMState, WMLast };        /* default atoms */
  63 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  64        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  65
  66 typedef union {
  67         int i;
  68         unsigned int ui;
  69         float f;
  70         void *v;
  71 } Arg;
  72
  73 typedef struct {
  74         unsigned int click;
  75         unsigned int mask;
  76         unsigned int button;
  77         void (*func)(const Arg *arg);
  78         const Arg arg;
  79 } Button;
  80
  81 typedef struct Client Client;
  82 struct Client {
  83         char name[256];
  84         float mina, maxa;
  85         int x, y, w, h;
  86         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  87         int bw, oldbw;
  88         unsigned int tags;
  89         Bool isfixed, isfloating, isurgent;
  90         Client *next;
  91         Client *snext;
  92         Window win;
  93 };
  94
  95 typedef struct {
  96         int x, y, w, h;
  97         unsigned long norm[ColLast];
  98         unsigned long sel[ColLast];
  99         Drawable drawable;
 100         GC gc;
 101         struct {
 102                 int ascent;
 103                 int descent;
 104                 int height;
 105                 XFontSet set;
 106                 XFontStruct *xfont;
 107         } font;
 108 } DC; /* draw context */
 109
 110 typedef struct {
 111         unsigned int mod;
 112         KeySym keysym;
 113         void (*func)(const Arg *);
 114         const Arg arg;
 115 } Key;
 116
 117 typedef struct {
 118         const char *symbol;
 119         void (*arrange)(void);
 120 } Layout;
 121
 122 typedef struct {
 123         const char *class;
 124         const char *instance;
 125         const char *title;
 126         unsigned int tags;
 127         Bool isfloating;
 128 } Rule;
 129
 130 /* function declarations */
 131 static void applyrules(Client *c);
 132 static void applysizehints(Client *c, int *w, int *h);
 133 static void arrange(void);
 134 static void attach(Client *c);
 135 static void attachstack(Client *c);
 136 static void buttonpress(XEvent *e);
 137 static void checkotherwm(void);
 138 static void cleanup(void);
 139 static void clearurgent(Client *c);
 140 static void configure(Client *c);
 141 static void configurenotify(XEvent *e);
 142 static void configurerequest(XEvent *e);
 143 static void destroynotify(XEvent *e);
 144 static void detach(Client *c);
 145 static void detachstack(Client *c);
 146 static void die(const char *errstr, ...);
 147 static void drawbar(void);
 148 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 149 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 150 static void enternotify(XEvent *e);
 151 static void expose(XEvent *e);
 152 static void focus(Client *c);
 153 static void focusin(XEvent *e);
 154 static void focusstack(const Arg *arg);
 155 static Client *getclient(Window w);
 156 static unsigned long getcolor(const char *colstr);
 157 static long getstate(Window w);
 158 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 159 static void grabbuttons(Client *c, Bool focused);
 160 static void grabkeys(void);
 161 static void initfont(const char *fontstr);
 162 static Bool isprotodel(Client *c);
 163 static void keypress(XEvent *e);
 164 static void killclient(const Arg *arg);
 165 static void manage(Window w, XWindowAttributes *wa);
 166 static void mappingnotify(XEvent *e);
 167 static void maprequest(XEvent *e);
 168 static void monocle(void);
 169 static void movemouse(const Arg *arg);
 170 static Client *nexttiled(Client *c);
 171 static void propertynotify(XEvent *e);
 172 static void quit(const Arg *arg);
 173 static void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 174 static void resizemouse(const Arg *arg);
 175 static void restack(void);
 176 static void run(void);
 177 static void scan(void);
 178 static void setclientstate(Client *c, long state);
 179 static void setlayout(const Arg *arg);
 180 static void setmfact(const Arg *arg);
 181 static void setup(void);
 182 static void showhide(Client *c, unsigned int ntiled);
 183 static void sigchld(int signal);
 184 static void spawn(const Arg *arg);
 185 static void tag(const Arg *arg);
 186 static int textnw(const char *text, unsigned int len);
 187 static void tile(void);
 188 static void togglebar(const Arg *arg);
 189 static void togglefloating(const Arg *arg);
 190 static void toggletag(const Arg *arg);
 191 static void toggleview(const Arg *arg);
 192 static void unmanage(Client *c);
 193 static void unmapnotify(XEvent *e);
 194 static void updatebar(void);
 195 static void updategeom(void);
 196 static void updatenumlockmask(void);
 197 static void updatesizehints(Client *c);
 198 static void updatestatus(void);
 199 static void updatetitle(Client *c);
 200 static void updatewmhints(Client *c);
 201 static void view(const Arg *arg);
 202 static int xerror(Display *dpy, XErrorEvent *ee);
 203 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 204 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 205 static void zoom(const Arg *arg);
 206
 207 /* variables */
 208 static char stext[256];
 209 static int screen;
 210 static int sx, sy, sw, sh; /* X display screen geometry x, y, width, height */
 211 static int by, bh, blw;    /* bar geometry y, height and layout symbol width */
 212 static int wx, wy, ww, wh; /* window area geometry x, y, width, height, bar excluded */
 213 static unsigned int seltags = 0, sellt = 0;
 214 static int (*xerrorxlib)(Display *, XErrorEvent *);
 215 static unsigned int numlockmask = 0;
 216 static void (*handler[LASTEvent]) (XEvent *) = {
 217         [ButtonPress] = buttonpress,
 218         [ConfigureRequest] = configurerequest,
 219         [ConfigureNotify] = configurenotify,
 220         [DestroyNotify] = destroynotify,
 221         [EnterNotify] = enternotify,
 222         [Expose] = expose,
 223         [FocusIn] = focusin,
 224         [KeyPress] = keypress,
 225         [MappingNotify] = mappingnotify,
 226         [MapRequest] = maprequest,
 227         [PropertyNotify] = propertynotify,
 228         [UnmapNotify] = unmapnotify
 229 };
 230 static Atom wmatom[WMLast], netatom[NetLast];
 231 static Bool otherwm;
 232 static Bool running = True;
 233 static Client *clients = NULL;
 234 static Client *sel = NULL;
 235 static Client *stack = NULL;
 236 static Cursor cursor[CurLast];
 237 static Display *dpy;
 238 static DC dc;
 239 static Layout *lt[] = { NULL, NULL };
 240 static Window root, barwin;
 241 /* configuration, allows nested code to access above variables */
 242 #include "config.h"
 243
 244 /* compile-time check if all tags fit into an unsigned int bit array. */
 245 struct NumTags { char limitexceeded[sizeof(unsigned int) * 8 < LENGTH(tags) ? -1 : 1]; };
 246
 247 /* function implementations */
 248 void
 249 applyrules(Client *c) {
 250         unsigned int i;
 251         Rule *r;
 252         XClassHint ch = { 0 };
 253
 254         /* rule matching */
 255         if(XGetClassHint(dpy, c->win, &ch)) {
 256                 for(i = 0; i < LENGTH(rules); i++) {
 257                         r = &rules[i];
 258                         if((!r->title || strstr(c->name, r->title))
 259                         && (!r->class || (ch.res_class && strstr(ch.res_class, r->class)))
 260                         && (!r->instance || (ch.res_name && strstr(ch.res_name, r->instance)))) {
 261                                 c->isfloating = r->isfloating;
 262                                 c->tags |= r->tags & TAGMASK ? r->tags & TAGMASK : tagset[seltags];
 263                         }
 264                 }
 265                 if(ch.res_class)
 266                         XFree(ch.res_class);
 267                 if(ch.res_name)
 268                         XFree(ch.res_name);
 269         }
 270         if(!c->tags)
 271                 c->tags = tagset[seltags];
 272 }
 273
 274 void
 275 applysizehints(Client *c, int *w, int *h) {
 276         Bool baseismin;
 277
 278         /* see last two sentences in ICCCM 4.1.2.3 */
 279         baseismin = c->basew == c->minw && c->baseh == c->minh;
 280
 281         /* set minimum possible */
 282         *w = MAX(1, *w);
 283         *h = MAX(1, *h);
 284
 285         if(!baseismin) { /* temporarily remove base dimensions */
 286                 *w -= c->basew;
 287                 *h -= c->baseh;
 288         }
 289
 290         /* adjust for aspect limits */
 291         if(c->mina > 0 && c->maxa > 0) {
 292                 if(c->maxa < (float)*w / *h)
 293                         *w = *h * c->maxa;
 294                 else if(c->mina < (float)*h / *w)
 295                         *h = *w * c->mina;
 296         }
 297
 298         if(baseismin) { /* increment calculation requires this */
 299                 *w -= c->basew;
 300                 *h -= c->baseh;
 301         }
 302
 303         /* adjust for increment value */
 304         if(c->incw)
 305                 *w -= *w % c->incw;
 306         if(c->inch)
 307                 *h -= *h % c->inch;
 308
 309         /* restore base dimensions */
 310         *w += c->basew;
 311         *h += c->baseh;
 312
 313         *w = MAX(*w, c->minw);
 314         *h = MAX(*h, c->minh);
 315
 316         if(c->maxw)
 317                 *w = MIN(*w, c->maxw);
 318
 319         if(c->maxh)
 320                 *h = MIN(*h, c->maxh);
 321 }
 322
 323 void
 324 arrange(void) {
 325         unsigned int nt;
 326         Client *c;
 327
 328         for(nt = 0, c = nexttiled(clients); c; c = nexttiled(c->next), nt++);
 329         showhide(stack, nt);
 330         focus(NULL);
 331         if(lt[sellt]->arrange)
 332                 lt[sellt]->arrange();
 333         restack();
 334 }
 335
 336 void
 337 attach(Client *c) {
 338         c->next = clients;
 339         clients = c;
 340 }
 341
 342 void
 343 attachstack(Client *c) {
 344         c->snext = stack;
 345         stack = c;
 346 }
 347
 348 void
 349 buttonpress(XEvent *e) {
 350         unsigned int i, x, click;
 351         Arg arg = {0};
 352         Client *c;
 353         XButtonPressedEvent *ev = &e->xbutton;
 354
 355         click = ClkRootWin;
 356         if(ev->window == barwin) {
 357                 i = x = 0;
 358                 do x += TEXTW(tags[i]); while(ev->x >= x && ++i < LENGTH(tags));
 359                 if(i < LENGTH(tags)) {
 360                         click = ClkTagBar;
 361                         arg.ui = 1 << i;
 362                 }
 363                 else if(ev->x < x + blw)
 364                         click = ClkLtSymbol;
 365                 else if(ev->x > wx + ww - TEXTW(stext))
 366                         click = ClkStatusText;
 367                 else
 368                         click = ClkWinTitle;
 369         }
 370         else if((c = getclient(ev->window))) {
 371                 focus(c);
 372                 click = ClkClientWin;
 373         }
 374
 375         for(i = 0; i < LENGTH(buttons); i++)
 376                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 377                    && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 378                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 379 }
 380
 381 void
 382 checkotherwm(void) {
 383         otherwm = False;
 384         xerrorxlib = XSetErrorHandler(xerrorstart);
 385
 386         /* this causes an error if some other window manager is running */
 387         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 388         XSync(dpy, False);
 389         if(otherwm)
 390                 die("dwm: another window manager is already running\n");
 391         XSetErrorHandler(xerror);
 392         XSync(dpy, False);
 393 }
 394
 395 void
 396 cleanup(void) {
 397         Arg a = {.ui = ~0};
 398         Layout foo = { "", NULL };
 399
 400         view(&a);
 401         lt[sellt] = &foo;
 402         while(stack)
 403                 unmanage(stack);
 404         if(dc.font.set)
 405                 XFreeFontSet(dpy, dc.font.set);
 406         else
 407                 XFreeFont(dpy, dc.font.xfont);
 408         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 409         XFreePixmap(dpy, dc.drawable);
 410         XFreeGC(dpy, dc.gc);
 411         XFreeCursor(dpy, cursor[CurNormal]);
 412         XFreeCursor(dpy, cursor[CurResize]);
 413         XFreeCursor(dpy, cursor[CurMove]);
 414         XDestroyWindow(dpy, barwin);
 415         XSync(dpy, False);
 416         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 417 }
 418
 419 void
 420 clearurgent(Client *c) {
 421         XWMHints *wmh;
 422
 423         c->isurgent = False;
 424         if(!(wmh = XGetWMHints(dpy, c->win)))
 425                 return;
 426         wmh->flags &= ~XUrgencyHint;
 427         XSetWMHints(dpy, c->win, wmh);
 428         XFree(wmh);
 429 }
 430
 431 void
 432 configure(Client *c) {
 433         XConfigureEvent ce;
 434
 435         ce.type = ConfigureNotify;
 436         ce.display = dpy;
 437         ce.event = c->win;
 438         ce.window = c->win;
 439         ce.x = c->x;
 440         ce.y = c->y;
 441         ce.width = c->w;
 442         ce.height = c->h;
 443         ce.border_width = c->bw;
 444         ce.above = None;
 445         ce.override_redirect = False;
 446         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 447 }
 448
 449 void
 450 configurenotify(XEvent *e) {
 451         XConfigureEvent *ev = &e->xconfigure;
 452
 453         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 454                 sw = ev->width;
 455                 sh = ev->height;
 456                 updategeom();
 457                 updatebar();
 458                 arrange();
 459         }
 460 }
 461
 462 void
 463 configurerequest(XEvent *e) {
 464         Client *c;
 465         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 466         XWindowChanges wc;
 467
 468         if((c = getclient(ev->window))) {
 469                 if(ev->value_mask & CWBorderWidth)
 470                         c->bw = ev->border_width;
 471                 else if(c->isfloating || !lt[sellt]->arrange) {
 472                         if(ev->value_mask & CWX)
 473                                 c->x = sx + ev->x;
 474                         if(ev->value_mask & CWY)
 475                                 c->y = sy + ev->y;
 476                         if(ev->value_mask & CWWidth)
 477                                 c->w = ev->width;
 478                         if(ev->value_mask & CWHeight)
 479                                 c->h = ev->height;
 480                         if((c->x - sx + c->w) > sw && c->isfloating)
 481                                 c->x = sx + (sw / 2 - c->w / 2); /* center in x direction */
 482                         if((c->y - sy + c->h) > sh && c->isfloating)
 483                                 c->y = sy + (sh / 2 - c->h / 2); /* center in y direction */
 484                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 485                                 configure(c);
 486                         if(ISVISIBLE(c))
 487                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 488                 }
 489                 else
 490                         configure(c);
 491         }
 492         else {
 493                 wc.x = ev->x;
 494                 wc.y = ev->y;
 495                 wc.width = ev->width;
 496                 wc.height = ev->height;
 497                 wc.border_width = ev->border_width;
 498                 wc.sibling = ev->above;
 499                 wc.stack_mode = ev->detail;
 500                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 501         }
 502         XSync(dpy, False);
 503 }
 504
 505 void
 506 destroynotify(XEvent *e) {
 507         Client *c;
 508         XDestroyWindowEvent *ev = &e->xdestroywindow;
 509
 510         if((c = getclient(ev->window)))
 511                 unmanage(c);
 512 }
 513
 514 void
 515 detach(Client *c) {
 516         Client **tc;
 517
 518         for(tc = &clients; *tc && *tc != c; tc = &(*tc)->next);
 519         *tc = c->next;
 520 }
 521
 522 void
 523 detachstack(Client *c) {
 524         Client **tc;
 525
 526         for(tc = &stack; *tc && *tc != c; tc = &(*tc)->snext);
 527         *tc = c->snext;
 528 }
 529
 530 void
 531 die(const char *errstr, ...) {
 532         va_list ap;
 533
 534         va_start(ap, errstr);
 535         vfprintf(stderr, errstr, ap);
 536         va_end(ap);
 537         exit(EXIT_FAILURE);
 538 }
 539
 540 void
 541 drawbar(void) {
 542         int x;
 543         unsigned int i, occ = 0, urg = 0;
 544         unsigned long *col;
 545         Client *c;
 546
 547         for(c = clients; c; c = c->next) {
 548                 occ |= c->tags;
 549                 if(c->isurgent)
 550                         urg |= c->tags;
 551         }
 552
 553         dc.x = 0;
 554         for(i = 0; i < LENGTH(tags); i++) {
 555                 dc.w = TEXTW(tags[i]);
 556                 col = tagset[seltags] & 1 << i ? dc.sel : dc.norm;
 557                 drawtext(tags[i], col, urg & 1 << i);
 558                 drawsquare(sel && sel->tags & 1 << i, occ & 1 << i, urg & 1 << i, col);
 559                 dc.x += dc.w;
 560         }
 561         if(blw > 0) {
 562                 dc.w = blw;
 563                 drawtext(lt[sellt]->symbol, dc.norm, False);
 564                 x = dc.x + dc.w;
 565         }
 566         else
 567                 x = dc.x;
 568         dc.w = TEXTW(stext);
 569         dc.x = ww - dc.w;
 570         if(dc.x < x) {
 571                 dc.x = x;
 572                 dc.w = ww - x;
 573         }
 574         drawtext(stext, dc.norm, False);
 575         if((dc.w = dc.x - x) > bh) {
 576                 dc.x = x;
 577                 if(sel) {
 578                         drawtext(sel->name, dc.sel, False);
 579                         drawsquare(sel->isfixed, sel->isfloating, False, dc.sel);
 580                 }
 581                 else
 582                         drawtext(NULL, dc.norm, False);
 583         }
 584         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, ww, bh, 0, 0);
 585         XSync(dpy, False);
 586 }
 587
 588 void
 589 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 590         int x;
 591         XGCValues gcv;
 592         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 593
 594         gcv.foreground = col[invert ? ColBG : ColFG];
 595         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 596         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 597         r.x = dc.x + 1;
 598         r.y = dc.y + 1;
 599         if(filled) {
 600                 r.width = r.height = x + 1;
 601                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 602         }
 603         else if(empty) {
 604                 r.width = r.height = x;
 605                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 606         }
 607 }
 608
 609 void
 610 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 611         char buf[256];
 612         int i, x, y, h, len, olen;
 613         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 614
 615         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 616         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 617         if(!text)
 618                 return;
 619         olen = strlen(text);
 620         h = dc.font.ascent + dc.font.descent;
 621         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 622         x = dc.x + (h / 2);
 623         /* shorten text if necessary */
 624         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 625         if(!len)
 626                 return;
 627         memcpy(buf, text, len);
 628         if(len < olen)
 629                 for(i = len; i && i > len - 3; buf[--i] = '.');
 630         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 631         if(dc.font.set)
 632                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 633         else
 634                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 635 }
 636
 637 void
 638 enternotify(XEvent *e) {
 639         Client *c;
 640         XCrossingEvent *ev = &e->xcrossing;
 641
 642         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 643                 return;
 644         if((c = getclient(ev->window)))
 645                 focus(c);
 646         else
 647                 focus(NULL);
 648 }
 649
 650 void
 651 expose(XEvent *e) {
 652         XExposeEvent *ev = &e->xexpose;
 653
 654         if(ev->count == 0 && (ev->window == barwin))
 655                 drawbar();
 656 }
 657
 658 void
 659 focus(Client *c) {
 660         if(!c || !ISVISIBLE(c))
 661                 for(c = stack; c && !ISVISIBLE(c); c = c->snext);
 662         if(sel && sel != c) {
 663                 grabbuttons(sel, False);
 664                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 665         }
 666         if(c) {
 667                 if(c->isurgent)
 668                         clearurgent(c);
 669                 detachstack(c);
 670                 attachstack(c);
 671                 grabbuttons(c, True);
 672                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 673                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 674         }
 675         else
 676                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 677         sel = c;
 678         drawbar();
 679 }
 680
 681 void
 682 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 683         XFocusChangeEvent *ev = &e->xfocus;
 684
 685         if(sel && ev->window != sel->win)
 686                 XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 687 }
 688
 689 void
 690 focusstack(const Arg *arg) {
 691         Client *c = NULL, *i;
 692
 693         if(!sel)
 694                 return;
 695         if (arg->i > 0) {
 696                 for(c = sel->next; c && !ISVISIBLE(c); c = c->next);
 697                 if(!c)
 698                         for(c = clients; c && !ISVISIBLE(c); c = c->next);
 699         }
 700         else {
 701                 for(i = clients; i != sel; i = i->next)
 702                         if(ISVISIBLE(i))
 703                                 c = i;
 704                 if(!c)
 705                         for(; i; i = i->next)
 706                                 if(ISVISIBLE(i))
 707                                         c = i;
 708         }
 709         if(c) {
 710                 focus(c);
 711                 restack();
 712         }
 713 }
 714
 715 Client *
 716 getclient(Window w) {
 717         Client *c;
 718
 719         for(c = clients; c && c->win != w; c = c->next);
 720         return c;
 721 }
 722
 723 unsigned long
 724 getcolor(const char *colstr) {
 725         Colormap cmap = DefaultColormap(dpy, screen);
 726         XColor color;
 727
 728         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 729                 die("error, cannot allocate color '%s'\n", colstr);
 730         return color.pixel;
 731 }
 732
 733 long
 734 getstate(Window w) {
 735         int format, status;
 736         long result = -1;
 737         unsigned char *p = NULL;
 738         unsigned long n, extra;
 739         Atom real;
 740
 741         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 742                         &real, &format, &n, &extra, (unsigned char **)&p);
 743         if(status != Success)
 744                 return -1;
 745         if(n != 0)
 746                 result = *p;
 747         XFree(p);
 748         return result;
 749 }
 750
 751 Bool
 752 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 753         char **list = NULL;
 754         int n;
 755         XTextProperty name;
 756
 757         if(!text || size == 0)
 758                 return False;
 759         text[0] = '\0';
 760         XGetTextProperty(dpy, w, &name, atom);
 761         if(!name.nitems)
 762                 return False;
 763         if(name.encoding == XA_STRING)
 764                 strncpy(text, (char *)name.value, size - 1);
 765         else {
 766                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 767                 && n > 0 && *list) {
 768                         strncpy(text, *list, size - 1);
 769                         XFreeStringList(list);
 770                 }
 771         }
 772         text[size - 1] = '\0';
 773         XFree(name.value);
 774         return True;
 775 }
 776
 777 void
 778 grabbuttons(Client *c, Bool focused) {
 779         updatenumlockmask();
 780         {
 781                 unsigned int i, j;
 782                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 783                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 784                 if(focused) {
 785                         for(i = 0; i < LENGTH(buttons); i++)
 786                                 if(buttons[i].click == ClkClientWin)
 787                                         for(j = 0; j < LENGTH(modifiers); j++)
 788                                                 XGrabButton(dpy, buttons[i].button, buttons[i].mask | modifiers[j], c->win, False, BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 789                 } else
 790                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 791                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 792         }
 793 }
 794
 795 void
 796 grabkeys(void) {
 797         updatenumlockmask();
 798         { /* grab keys */
 799                 unsigned int i, j;
 800                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 801                 KeyCode code;
 802
 803                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 804                 for(i = 0; i < LENGTH(keys); i++) {
 805                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
 806                                 for(j = 0; j < LENGTH(modifiers); j++)
 807                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
 808                                                  True, GrabModeAsync, GrabModeAsync);
 809                 }
 810         }
 811 }
 812
 813 void
 814 initfont(const char *fontstr) {
 815         char *def, **missing;
 816         int i, n;
 817
 818         missing = NULL;
 819         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 820         if(missing) {
 821                 while(n--)
 822                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 823                 XFreeStringList(missing);
 824         }
 825         if(dc.font.set) {
 826                 XFontSetExtents *font_extents;
 827                 XFontStruct **xfonts;
 828                 char **font_names;
 829                 dc.font.ascent = dc.font.descent = 0;
 830                 font_extents = XExtentsOfFontSet(dc.font.set);
 831                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 832                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 833                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 834                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
 835                         xfonts++;
 836                 }
 837         }
 838         else {
 839                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 840                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 841                         die("error, cannot load font: '%s'\n", fontstr);
 842                 dc.font.ascent = dc.font.xfont->ascent;
 843                 dc.font.descent = dc.font.xfont->descent;
 844         }
 845         dc.font.height = dc.font.ascent + dc.font.descent;
 846 }
 847
 848 Bool
 849 isprotodel(Client *c) {
 850         int i, n;
 851         Atom *protocols;
 852         Bool ret = False;
 853
 854         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 855                 for(i = 0; !ret && i < n; i++)
 856                         if(protocols[i] == wmatom[WMDelete])
 857                                 ret = True;
 858                 XFree(protocols);
 859         }
 860         return ret;
 861 }
 862
 863 void
 864 keypress(XEvent *e) {
 865         unsigned int i;
 866         KeySym keysym;
 867         XKeyEvent *ev;
 868
 869         ev = &e->xkey;
 870         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 871         for(i = 0; i < LENGTH(keys); i++)
 872                 if(keysym == keys[i].keysym
 873                    && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 874                    && keys[i].func)
 875                         keys[i].func(&(keys[i].arg));
 876 }
 877
 878 void
 879 killclient(const Arg *arg) {
 880         XEvent ev;
 881
 882         if(!sel)
 883                 return;
 884         if(isprotodel(sel)) {
 885                 ev.type = ClientMessage;
 886                 ev.xclient.window = sel->win;
 887                 ev.xclient.message_type = wmatom[WMProtocols];
 888                 ev.xclient.format = 32;
 889                 ev.xclient.data.l[0] = wmatom[WMDelete];
 890                 ev.xclient.data.l[1] = CurrentTime;
 891                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 892         }
 893         else
 894                 XKillClient(dpy, sel->win);
 895 }
 896
 897 void
 898 manage(Window w, XWindowAttributes *wa) {
 899         static Client cz;
 900         Client *c, *t = NULL;
 901         Window trans = None;
 902         XWindowChanges wc;
 903
 904         if(!(c = malloc(sizeof(Client))))
 905                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
 906         *c = cz;
 907         c->win = w;
 908
 909         /* geometry */
 910         c->x = wa->x;
 911         c->y = wa->y;
 912         c->w = wa->width;
 913         c->h = wa->height;
 914         c->oldbw = wa->border_width;
 915         if(c->w == sw && c->h == sh) {
 916                 c->x = sx;
 917                 c->y = sy;
 918                 c->bw = 0;
 919         }
 920         else {
 921                 if(c->x + WIDTH(c) > sx + sw)
 922                         c->x = sx + sw - WIDTH(c);
 923                 if(c->y + HEIGHT(c) > sy + sh)
 924                         c->y = sy + sh - HEIGHT(c);
 925                 c->x = MAX(c->x, sx);
 926                 /* only fix client y-offset, if the client center might cover the bar */
 927                 c->y = MAX(c->y, ((by == 0) && (c->x + (c->w / 2) >= wx) && (c->x + (c->w / 2) < wx + ww)) ? bh : sy);
 928                 c->bw = borderpx;
 929         }
 930
 931         wc.border_width = c->bw;
 932         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 933         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
 934         configure(c); /* propagates border_width, if size doesn't change */
 935         updatesizehints(c);
 936         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 937         grabbuttons(c, False);
 938         updatetitle(c);
 939         if(XGetTransientForHint(dpy, w, &trans))
 940                 t = getclient(trans);
 941         if(t)
 942                 c->tags = t->tags;
 943         else
 944                 applyrules(c);
 945         if(!c->isfloating)
 946                 c->isfloating = trans != None || c->isfixed;
 947         if(c->isfloating)
 948                 XRaiseWindow(dpy, c->win);
 949         attach(c);
 950         attachstack(c);
 951         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
 952         XMapWindow(dpy, c->win);
 953         setclientstate(c, NormalState);
 954         arrange();
 955 }
 956
 957 void
 958 mappingnotify(XEvent *e) {
 959         XMappingEvent *ev = &e->xmapping;
 960
 961         XRefreshKeyboardMapping(ev);
 962         if(ev->request == MappingKeyboard)
 963                 grabkeys();
 964 }
 965
 966 void
 967 maprequest(XEvent *e) {
 968         static XWindowAttributes wa;
 969         XMapRequestEvent *ev = &e->xmaprequest;
 970
 971         if(!XGetWindowAttributes(dpy, ev->window, &wa))
 972                 return;
 973         if(wa.override_redirect)
 974                 return;
 975         if(!getclient(ev->window))
 976                 manage(ev->window, &wa);
 977 }
 978
 979 void
 980 monocle(void) {
 981         Client *c;
 982
 983         for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
 984                 resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
 985         }
 986 }
 987
 988 void
 989 movemouse(const Arg *arg) {
 990         int x, y, ocx, ocy, di, nx, ny;
 991         unsigned int dui;
 992         Client *c;
 993         Window dummy;
 994         XEvent ev;
 995
 996         if(!(c = sel))
 997                 return;
 998         restack();
 999         ocx = c->x;
1000         ocy = c->y;
1001         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1002         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1003                 return;
1004         XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui);
1005         if(usegrab)
1006                 XGrabServer(dpy);
1007         do {
1008                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1009                 switch (ev.type) {
1010                 case ConfigureRequest:
1011                 case Expose:
1012                 case MapRequest:
1013                         handler[ev.type](&ev);
1014                         break;
1015                 case MotionNotify:
1016                         nx = ocx + (ev.xmotion.x - x);
1017                         ny = ocy + (ev.xmotion.y - y);
1018                         if(snap && nx >= wx && nx <= wx + ww
1019                                 && ny >= wy && ny <= wy + wh) {
1020                                 if(abs(wx - nx) < snap)
1021                                         nx = wx;
1022                                 else if(abs((wx + ww) - (nx + WIDTH(c))) < snap)
1023                                         nx = wx + ww - WIDTH(c);
1024                                 if(abs(wy - ny) < snap)
1025                                         ny = wy;
1026                                 else if(abs((wy + wh) - (ny + HEIGHT(c))) < snap)
1027                                         ny = wy + wh - HEIGHT(c);
1028                                 if(!c->isfloating && lt[sellt]->arrange && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1029                                         togglefloating(NULL);
1030                         }
1031                         if(!lt[sellt]->arrange || c->isfloating)
1032                                 resize(c, nx, ny, c->w, c->h, False);
1033                         break;
1034                 }
1035         }
1036         while(ev.type != ButtonRelease);
1037         if(usegrab)
1038                 XUngrabServer(dpy);
1039         XUngrabPointer(dpy, CurrentTime);
1040 }
1041
1042 Client *
1043 nexttiled(Client *c) {
1044         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1045         return c;
1046 }
1047
1048 void
1049 propertynotify(XEvent *e) {
1050         Client *c;
1051         Window trans;
1052         XPropertyEvent *ev = &e->xproperty;
1053
1054         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1055                 updatestatus();
1056         else if(ev->state == PropertyDelete)
1057                 return; /* ignore */
1058         else if((c = getclient(ev->window))) {
1059                 switch (ev->atom) {
1060                 default: break;
1061                 case XA_WM_TRANSIENT_FOR:
1062                         XGetTransientForHint(dpy, c->win, &trans);
1063                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1064                                 arrange();
1065                         break;
1066                 case XA_WM_NORMAL_HINTS:
1067                         updatesizehints(c);
1068                         break;
1069                 case XA_WM_HINTS:
1070                         updatewmhints(c);
1071                         drawbar();
1072                         break;
1073                 }
1074                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1075                         updatetitle(c);
1076                         if(c == sel)
1077                                 drawbar();
1078                 }
1079         }
1080 }
1081
1082 void
1083 quit(const Arg *arg) {
1084         running = False;
1085 }
1086
1087 void
1088 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1089         XWindowChanges wc;
1090
1091         if(sizehints)
1092                 applysizehints(c, &w, &h);
1093         if(w <= 0 || h <= 0)
1094                 return;
1095         if(x > sx + sw)
1096                 x = sw - WIDTH(c);
1097         if(y > sy + sh)
1098                 y = sh - HEIGHT(c);
1099         if(x + w + 2 * c->bw < sx)
1100                 x = sx;
1101         if(y + h + 2 * c->bw < sy)
1102                 y = sy;
1103         if(h < bh)
1104                 h = bh;
1105         if(w < bh)
1106                 w = bh;
1107         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1108                 c->x = wc.x = x;
1109                 c->y = wc.y = y;
1110                 c->w = wc.width = w;
1111                 c->h = wc.height = h;
1112                 wc.border_width = c->bw;
1113                 XConfigureWindow(dpy, c->win,
1114                                 CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1115                 configure(c);
1116                 XSync(dpy, False);
1117         }
1118 }
1119
1120 void
1121 resizemouse(const Arg *arg) {
1122         int ocx, ocy;
1123         int nw, nh;
1124         Client *c;
1125         XEvent ev;
1126
1127         if(!(c = sel))
1128                 return;
1129         restack();
1130         ocx = c->x;
1131         ocy = c->y;
1132         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1133         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1134                 return;
1135         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1136         if(usegrab)
1137                 XGrabServer(dpy);
1138         do {
1139                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1140                 switch(ev.type) {
1141                 case ConfigureRequest:
1142                 case Expose:
1143                 case MapRequest:
1144                         handler[ev.type](&ev);
1145                         break;
1146                 case MotionNotify:
1147                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1148                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1149
1150                         if(snap && nw >= wx && nw <= wx + ww
1151                                 && nh >= wy && nh <= wy + wh) {
1152                                 if(!c->isfloating && lt[sellt]->arrange
1153                                    && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1154                                         togglefloating(NULL);
1155                         }
1156                         if(!lt[sellt]->arrange || c->isfloating)
1157                                 resize(c, c->x, c->y, nw, nh, True);
1158                         break;
1159                 }
1160         }
1161         while(ev.type != ButtonRelease);
1162         if(usegrab)
1163                 XUngrabServer(dpy);
1164         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1165         XUngrabPointer(dpy, CurrentTime);
1166         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1167 }
1168
1169 void
1170 restack(void) {
1171         Client *c;
1172         XEvent ev;
1173         XWindowChanges wc;
1174
1175         drawbar();
1176         if(!sel)
1177                 return;
1178         if(sel->isfloating || !lt[sellt]->arrange)
1179                 XRaiseWindow(dpy, sel->win);
1180         if(lt[sellt]->arrange) {
1181                 wc.stack_mode = Below;
1182                 wc.sibling = barwin;
1183                 for(c = stack; c; c = c->snext)
1184                         if(!c->isfloating && ISVISIBLE(c)) {
1185                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1186                                 wc.sibling = c->win;
1187                         }
1188         }
1189         XSync(dpy, False);
1190         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1191 }
1192
1193 void
1194 run(void) {
1195         XEvent ev;
1196
1197         /* main event loop */
1198         XSync(dpy, False);
1199         while(running && !XNextEvent(dpy, &ev)) {
1200                 if(handler[ev.type])
1201                         (handler[ev.type])(&ev); /* call handler */
1202         }
1203 }
1204
1205 void
1206 scan(void) {
1207         unsigned int i, num;
1208         Window d1, d2, *wins = NULL;
1209         XWindowAttributes wa;
1210
1211         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1212                 for(i = 0; i < num; i++) {
1213                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1214                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1215                                 continue;
1216                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1217                                 manage(wins[i], &wa);
1218                 }
1219                 for(i = 0; i < num; i++) { /* now the transients */
1220                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1221                                 continue;
1222                         if(XGetTransientForHint(dpy, wins[i], &d1)
1223                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1224                                 manage(wins[i], &wa);
1225                 }
1226                 if(wins)
1227                         XFree(wins);
1228         }
1229 }
1230
1231 void
1232 setclientstate(Client *c, long state) {
1233         long data[] = {state, None};
1234
1235         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1236                         PropModeReplace, (unsigned char *)data, 2);
1237 }
1238
1239 void
1240 setlayout(const Arg *arg) {
1241         if(!arg || !arg->v || arg->v != lt[sellt])
1242                 sellt ^= 1;
1243         if(arg && arg->v)
1244                 lt[sellt] = (Layout *)arg->v;
1245         if(sel)
1246                 arrange();
1247         else
1248                 drawbar();
1249 }
1250
1251 /* arg > 1.0 will set mfact absolutly */
1252 void
1253 setmfact(const Arg *arg) {
1254         float f;
1255
1256         if(!arg || !lt[sellt]->arrange)
1257                 return;
1258         f = arg->f < 1.0 ? arg->f + mfact : arg->f - 1.0;
1259         if(f < 0.1 || f > 0.9)
1260                 return;
1261         mfact = f;
1262         arrange();
1263 }
1264
1265 void
1266 setup(void) {
1267         unsigned int i;
1268         int w;
1269         XSetWindowAttributes wa;
1270
1271         /* init screen */
1272         screen = DefaultScreen(dpy);
1273         root = RootWindow(dpy, screen);
1274         initfont(font);
1275         sx = 0;
1276         sy = 0;
1277         sw = DisplayWidth(dpy, screen);
1278         sh = DisplayHeight(dpy, screen);
1279         bh = dc.h = dc.font.height + 2;
1280         lt[0] = &layouts[0];
1281         lt[1] = &layouts[1 % LENGTH(layouts)];
1282         updategeom();
1283
1284         /* init atoms */
1285         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1286         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1287         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1288         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1289         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1290
1291         /* init cursors */
1292         wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1293         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1294         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1295
1296         /* init appearance */
1297         dc.norm[ColBorder] = getcolor(normbordercolor);
1298         dc.norm[ColBG] = getcolor(normbgcolor);
1299         dc.norm[ColFG] = getcolor(normfgcolor);
1300         dc.sel[ColBorder] = getcolor(selbordercolor);
1301         dc.sel[ColBG] = getcolor(selbgcolor);
1302         dc.sel[ColFG] = getcolor(selfgcolor);
1303         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1304         dc.gc = XCreateGC(dpy, root, 0, NULL);
1305         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1306         if(!dc.font.set)
1307                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1308
1309         /* init bar */
1310         for(blw = i = 0; LENGTH(layouts) > 1 && i < LENGTH(layouts); i++) {
1311                 w = TEXTW(layouts[i].symbol);
1312                 blw = MAX(blw, w);
1313         }
1314
1315         wa.override_redirect = True;
1316         wa.background_pixmap = ParentRelative;
1317         wa.event_mask = ButtonPressMask|ExposureMask;
1318
1319         barwin = XCreateWindow(dpy, root, wx, by, ww, bh, 0, DefaultDepth(dpy, screen),
1320                         CopyFromParent, DefaultVisual(dpy, screen),
1321                         CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1322         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1323         XMapRaised(dpy, barwin);
1324         updatestatus();
1325
1326         /* EWMH support per view */
1327         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1328                         PropModeReplace, (unsigned char *) netatom, NetLast);
1329
1330         /* select for events */
1331         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1332                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask
1333                         |PropertyChangeMask;
1334         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1335         XSelectInput(dpy, root, wa.event_mask);
1336
1337         grabkeys();
1338 }
1339
1340 void
1341 showhide(Client *c, unsigned int ntiled) {
1342         if(!c)
1343                 return;
1344         if(ISVISIBLE(c)) { /* show clients top down */
1345                 XMoveWindow(dpy, c->win, c->x, c->y);
1346                 if(!lt[sellt]->arrange || c->isfloating)
1347                         resize(c, c->x, c->y, c->w, c->h, True);
1348                 showhide(c->snext, ntiled);
1349         }
1350         else { /* hide clients bottom up */
1351                 showhide(c->snext, ntiled);
1352                 XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
1353         }
1354 }
1355
1356
1357 void
1358 sigchld(int signal) {
1359         while(0 < waitpid(-1, NULL, WNOHANG));
1360 }
1361
1362 void
1363 spawn(const Arg *arg) {
1364         signal(SIGCHLD, sigchld);
1365         if(fork() == 0) {
1366                 if(dpy)
1367                         close(ConnectionNumber(dpy));
1368                 setsid();
1369                 execvp(((char **)arg->v)[0], (char **)arg->v);
1370                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1371                 perror(" failed");
1372                 exit(0);
1373         }
1374 }
1375
1376 void
1377 tag(const Arg *arg) {
1378         if(sel && arg->ui & TAGMASK) {
1379                 sel->tags = arg->ui & TAGMASK;
1380                 arrange();
1381         }
1382 }
1383
1384 int
1385 textnw(const char *text, unsigned int len) {
1386         XRectangle r;
1387
1388         if(dc.font.set) {
1389                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1390                 return r.width;
1391         }
1392         return XTextWidth(dc.font.xfont, text, len);
1393 }
1394
1395 void
1396 tile(void) {
1397         int x, y, h, w, mw;
1398         unsigned int i, n;
1399         Client *c;
1400
1401         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
1402         if(n == 0)
1403                 return;
1404
1405         /* master */
1406         c = nexttiled(clients);
1407         mw = mfact * ww;
1408         resize(c, wx, wy, (n == 1 ? ww : mw) - 2 * c->bw, wh - 2 * c->bw, resizehints);
1409
1410         if(--n == 0)
1411                 return;
1412
1413         /* tile stack */
1414         x = (wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + mw;
1415         y = wy;
1416         w = (wx + mw > c->x + c->w) ? wx + ww - x : ww - mw;
1417         h = wh / n;
1418         if(h < bh)
1419                 h = wh;
1420
1421         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1422                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1423                        ? wy + wh - y - 2 * c->bw : h - 2 * c->bw), resizehints);
1424                 if(h != wh)
1425                         y = c->y + HEIGHT(c);
1426         }
1427 }
1428
1429 void
1430 togglebar(const Arg *arg) {
1431         showbar = !showbar;
1432         updategeom();
1433         updatebar();
1434         arrange();
1435 }
1436
1437 void
1438 togglefloating(const Arg *arg) {
1439         if(!sel)
1440                 return;
1441         sel->isfloating = !sel->isfloating || sel->isfixed;
1442         if(sel->isfloating)
1443                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1444         arrange();
1445 }
1446
1447 void
1448 toggletag(const Arg *arg) {
1449         unsigned int mask;
1450
1451         if (!sel)
1452                 return;
1453
1454         mask = sel->tags ^ (arg->ui & TAGMASK);
1455         if(mask) {
1456                 sel->tags = mask;
1457                 arrange();
1458         }
1459 }
1460
1461 void
1462 toggleview(const Arg *arg) {
1463         unsigned int mask = tagset[seltags] ^ (arg->ui & TAGMASK);
1464
1465         if(mask) {
1466                 tagset[seltags] = mask;
1467                 arrange();
1468         }
1469 }
1470
1471 void
1472 unmanage(Client *c) {
1473         XWindowChanges wc;
1474
1475         wc.border_width = c->oldbw;
1476         /* The server grab construct avoids race conditions. */
1477         XGrabServer(dpy);
1478         XSetErrorHandler(xerrordummy);
1479         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1480         detach(c);
1481         detachstack(c);
1482         if(sel == c)
1483                 focus(NULL);
1484         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1485         setclientstate(c, WithdrawnState);
1486         free(c);
1487         XSync(dpy, False);
1488         XSetErrorHandler(xerror);
1489         XUngrabServer(dpy);
1490         arrange();
1491 }
1492
1493 void
1494 unmapnotify(XEvent *e) {
1495         Client *c;
1496         XUnmapEvent *ev = &e->xunmap;
1497
1498         if((c = getclient(ev->window)))
1499                 unmanage(c);
1500 }
1501
1502 void
1503 updatebar(void) {
1504         if(dc.drawable != 0)
1505                 XFreePixmap(dpy, dc.drawable);
1506         dc.drawable = XCreatePixmap(dpy, root, ww, bh, DefaultDepth(dpy, screen));
1507         XMoveResizeWindow(dpy, barwin, wx, by, ww, bh);
1508 }
1509
1510 void
1511 updategeom(void) {
1512 #ifdef XINERAMA
1513         int n, i = 0;
1514         XineramaScreenInfo *info = NULL;
1515
1516         /* window area geometry */
1517         if(XineramaIsActive(dpy) && (info = XineramaQueryScreens(dpy, &n))) {
1518                 if(n > 1) {
1519                         int di, x, y;
1520                         unsigned int dui;
1521                         Window dummy;
1522                         if(XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui))
1523                                 for(i = 0; i < n; i++)
1524                                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
1525                                                 break;
1526                 }
1527                 wx = info[i].x_org;
1528                 wy = showbar && topbar ?  info[i].y_org + bh : info[i].y_org;
1529                 ww = info[i].width;
1530                 wh = showbar ? info[i].height - bh : info[i].height;
1531                 XFree(info);
1532         }
1533         else
1534 #endif
1535         {
1536                 wx = sx;
1537                 wy = showbar && topbar ? sy + bh : sy;
1538                 ww = sw;
1539                 wh = showbar ? sh - bh : sh;
1540         }
1541
1542         /* bar position */
1543         by = showbar ? (topbar ? wy - bh : wy + wh) : -bh;
1544 }
1545
1546 void
1547 updatenumlockmask(void) {
1548         unsigned int i, j;
1549         XModifierKeymap *modmap;
1550
1551         numlockmask = 0;
1552         modmap = XGetModifierMapping(dpy);
1553         for(i = 0; i < 8; i++)
1554                 for(j = 0; j < modmap->max_keypermod; j++)
1555                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
1556                                 numlockmask = (1 << i);
1557         XFreeModifiermap(modmap);
1558 }
1559
1560 void
1561 updatesizehints(Client *c) {
1562         long msize;
1563         XSizeHints size;
1564
1565         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1566                 /* size is uninitialized, ensure that size.flags aren't used */
1567                 size.flags = PSize;
1568         if(size.flags & PBaseSize) {
1569                 c->basew = size.base_width;
1570                 c->baseh = size.base_height;
1571         }
1572         else if(size.flags & PMinSize) {
1573                 c->basew = size.min_width;
1574                 c->baseh = size.min_height;
1575         }
1576         else
1577                 c->basew = c->baseh = 0;
1578         if(size.flags & PResizeInc) {
1579                 c->incw = size.width_inc;
1580                 c->inch = size.height_inc;
1581         }
1582         else
1583                 c->incw = c->inch = 0;
1584         if(size.flags & PMaxSize) {
1585                 c->maxw = size.max_width;
1586                 c->maxh = size.max_height;
1587         }
1588         else
1589                 c->maxw = c->maxh = 0;
1590         if(size.flags & PMinSize) {
1591                 c->minw = size.min_width;
1592                 c->minh = size.min_height;
1593         }
1594         else if(size.flags & PBaseSize) {
1595                 c->minw = size.base_width;
1596                 c->minh = size.base_height;
1597         }
1598         else
1599                 c->minw = c->minh = 0;
1600         if(size.flags & PAspect) {
1601                 c->mina = (float)size.min_aspect.y / (float)size.min_aspect.x;
1602                 c->maxa = (float)size.max_aspect.x / (float)size.max_aspect.y;
1603         }
1604         else
1605                 c->maxa = c->mina = 0.0;
1606         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1607                      && c->maxw == c->minw && c->maxh == c->minh);
1608 }
1609
1610 void
1611 updatetitle(Client *c) {
1612         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1613                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
1614 }
1615
1616 void
1617 updatestatus() {
1618         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
1619                 strcpy(stext, "dwm-"VERSION);
1620         drawbar();
1621 }
1622
1623 void
1624 updatewmhints(Client *c) {
1625         XWMHints *wmh;
1626
1627         if((wmh = XGetWMHints(dpy, c->win))) {
1628                 if(c == sel && wmh->flags & XUrgencyHint) {
1629                         wmh->flags &= ~XUrgencyHint;
1630                         XSetWMHints(dpy, c->win, wmh);
1631                 }
1632                 else
1633                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1634
1635                 XFree(wmh);
1636         }
1637 }
1638
1639 void
1640 view(const Arg *arg) {
1641         if((arg->ui & TAGMASK) == tagset[seltags])
1642                 return;
1643         seltags ^= 1; /* toggle sel tagset */
1644         if(arg->ui & TAGMASK)
1645                 tagset[seltags] = arg->ui & TAGMASK;
1646         arrange();
1647 }
1648
1649 /* There's no way to check accesses to destroyed windows, thus those cases are
1650  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1651  * default error handler, which may call exit.  */
1652 int
1653 xerror(Display *dpy, XErrorEvent *ee) {
1654         if(ee->error_code == BadWindow
1655         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1656         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1657         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1658         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1659         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1660         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1661         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1662         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1663                 return 0;
1664         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1665                         ee->request_code, ee->error_code);
1666         return xerrorxlib(dpy, ee); /* may call exit */
1667 }
1668
1669 int
1670 xerrordummy(Display *dpy, XErrorEvent *ee) {
1671         return 0;
1672 }
1673
1674 /* Startup Error handler to check if another window manager
1675  * is already running. */
1676 int
1677 xerrorstart(Display *dpy, XErrorEvent *ee) {
1678         otherwm = True;
1679         return -1;
1680 }
1681
1682 void
1683 zoom(const Arg *arg) {
1684         Client *c = sel;
1685
1686         if(!lt[sellt]->arrange || lt[sellt]->arrange == monocle || (sel && sel->isfloating))
1687                 return;
1688         if(c == nexttiled(clients))
1689                 if(!c || !(c = nexttiled(c->next)))
1690                         return;
1691         detach(c);
1692         attach(c);
1693         focus(c);
1694         arrange();
1695 }
1696
1697 int
1698 main(int argc, char *argv[]) {
1699         if(argc == 2 && !strcmp("-v", argv[1]))
1700                 die("dwm-"VERSION", © 2006-2009 dwm engineers, see LICENSE for details\n");
1701         else if(argc != 1)
1702                 die("usage: dwm [-v]\n");
1703
1704         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1705                 fputs("warning: no locale support\n", stderr);
1706
1707         if(!(dpy = XOpenDisplay(NULL)))
1708                 die("dwm: cannot open display\n");
1709
1710         checkotherwm();
1711         setup();
1712         scan();
1713         run();
1714         cleanup();
1715
1716         XCloseDisplay(dpy);
1717         return 0;
1718 }