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  * Calls to fetch an X event from the event queue are blocking.  Due reading
  10  * status text from standard input, a select()-driven main loop has been
  11  * implemented which selects for reads on the X connection and STDIN_FILENO to
  12  * handle all data smoothly. The event handlers of dwm are organized in an
  13  * array which is accessed whenever a new event has been fetched. This allows
  14  * event dispatching in O(1) time.
  15  *
  16  * Each child of the root window is called a client, except windows which have
  17  * set the override_redirect flag.  Clients are organized in a global
  18  * doubly-linked client list, the focus history is remembered through a global
  19  * stack list. Each client contains an array of Bools of the same size as the
  20  * global tags array to indicate the tags of a client.  For each client dwm
  21  * creates a small title window, which is resized whenever the (_NET_)WM_NAME
  22  * properties are updated or the client is moved/resized.
  23  *
  24  * Keys and tagging rules are organized as arrays and defined in config.h.
  25  *
  26  * To understand everything else, start reading main().
  27  */
  28 #include <errno.h>
  29 #include <locale.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <sys/select.h>
  36 #include <sys/types.h>
  37 #include <sys/wait.h>
  38 #include <regex.h>
  39 #include <X11/cursorfont.h>
  40 #include <X11/keysym.h>
  41 #include <X11/Xatom.h>
  42 #include <X11/Xlib.h>
  43 #include <X11/Xproto.h>
  44 #include <X11/Xutil.h>
  45
  46 /* macros */
  47 #define BUTTONMASK              (ButtonPressMask | ButtonReleaseMask)
  48 #define CLEANMASK(mask)         (mask & ~(numlockmask | LockMask))
  49 #define MOUSEMASK               (BUTTONMASK | PointerMotionMask)
  50
  51 /* enums */
  52 enum { BarTop, BarBot, BarOff };                        /* bar position */
  53 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  54 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  55 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  56 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
  57
  58 /* typedefs */
  59 typedef struct Client Client;
  60 struct Client {
  61         char name[256];
  62         int x, y, w, h;
  63         int rx, ry, rw, rh; /* revert geometry */
  64         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  65         int minax, maxax, minay, maxay;
  66         long flags;
  67         unsigned int border, oldborder;
  68         Bool isbanned, isfixed, ismax, isfloating, wasfloating;
  69         Bool *tags;
  70         Client *next;
  71         Client *prev;
  72         Client *snext;
  73         Window win;
  74 };
  75
  76 typedef struct {
  77         int x, y, w, h;
  78         unsigned long norm[ColLast];
  79         unsigned long sel[ColLast];
  80         Drawable drawable;
  81         GC gc;
  82         struct {
  83                 int ascent;
  84                 int descent;
  85                 int height;
  86                 XFontSet set;
  87                 XFontStruct *xfont;
  88         } font;
  89 } DC; /* draw context */
  90
  91 typedef struct {
  92         unsigned long mod;
  93         KeySym keysym;
  94         void (*func)(const char *arg);
  95         const char *arg;
  96 } Key;
  97
  98 typedef struct {
  99         const char *symbol;
 100         void (*arrange)(void);
 101 } Layout;
 102
 103 typedef struct {
 104         const char *prop;
 105         const char *tags;
 106         Bool isfloating;
 107 } Rule;
 108
 109 typedef struct {
 110         regex_t *propregex;
 111         regex_t *tagregex;
 112 } Regs;
 113
 114 /* function declarations */
 115 void applyrules(Client *c);
 116 void arrange(void);
 117 void attach(Client *c);
 118 void attachstack(Client *c);
 119 void ban(Client *c);
 120 void buttonpress(XEvent *e);
 121 void checkotherwm(void);
 122 void cleanup(void);
 123 void compileregs(void);
 124 void configure(Client *c);
 125 void configurenotify(XEvent *e);
 126 void configurerequest(XEvent *e);
 127 void destroynotify(XEvent *e);
 128 void detach(Client *c);
 129 void detachstack(Client *c);
 130 void drawbar(void);
 131 void drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]);
 132 void drawtext(const char *text, unsigned long col[ColLast]);
 133 void *emallocz(unsigned int size);
 134 void enternotify(XEvent *e);
 135 void eprint(const char *errstr, ...);
 136 void expose(XEvent *e);
 137 void floating(void); /* default floating layout */
 138 void focus(Client *c);
 139 void focusnext(const char *arg);
 140 void focusprev(const char *arg);
 141 Client *getclient(Window w);
 142 unsigned long getcolor(const char *colstr);
 143 long getstate(Window w);
 144 Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 145 void grabbuttons(Client *c, Bool focused);
 146 unsigned int idxoftag(const char *tag);
 147 void initfont(const char *fontstr);
 148 Bool isoccupied(unsigned int t);
 149 Bool isprotodel(Client *c);
 150 Bool isvisible(Client *c);
 151 void keypress(XEvent *e);
 152 void killclient(const char *arg);
 153 void leavenotify(XEvent *e);
 154 void manage(Window w, XWindowAttributes *wa);
 155 void mappingnotify(XEvent *e);
 156 void maprequest(XEvent *e);
 157 void movemouse(Client *c);
 158 Client *nexttiled(Client *c);
 159 void propertynotify(XEvent *e);
 160 void quit(const char *arg);
 161 void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 162 void resizemouse(Client *c);
 163 void restack(void);
 164 void run(void);
 165 void scan(void);
 166 void setclientstate(Client *c, long state);
 167 void setlayout(const char *arg);
 168 void setmwfact(const char *arg);
 169 void setup(void);
 170 void spawn(const char *arg);
 171 void tag(const char *arg);
 172 unsigned int textnw(const char *text, unsigned int len);
 173 unsigned int textw(const char *text);
 174 void tile(void);
 175 void togglebar(const char *arg);
 176 void togglefloating(const char *arg);
 177 void togglemax(const char *arg);
 178 void toggletag(const char *arg);
 179 void toggleview(const char *arg);
 180 void unban(Client *c);
 181 void unmanage(Client *c);
 182 void unmapnotify(XEvent *e);
 183 void updatebarpos(void);
 184 void updatesizehints(Client *c);
 185 void updatetitle(Client *c);
 186 void view(const char *arg);
 187 void viewprevtag(const char *arg);      /* views previous selected tags */
 188 int xerror(Display *dpy, XErrorEvent *ee);
 189 int xerrordummy(Display *dsply, XErrorEvent *ee);
 190 int xerrorstart(Display *dsply, XErrorEvent *ee);
 191 void zoom(const char *arg);
 192
 193 /* variables */
 194 char stext[256];
 195 double mwfact;
 196 int screen, sx, sy, sw, sh, wax, way, waw, wah;
 197 int (*xerrorxlib)(Display *, XErrorEvent *);
 198 unsigned int bh, bpos;
 199 unsigned int blw = 0;
 200 unsigned int numlockmask = 0;
 201 void (*handler[LASTEvent]) (XEvent *) = {
 202         [ButtonPress] = buttonpress,
 203         [ConfigureRequest] = configurerequest,
 204         [ConfigureNotify] = configurenotify,
 205         [DestroyNotify] = destroynotify,
 206         [EnterNotify] = enternotify,
 207         [LeaveNotify] = leavenotify,
 208         [Expose] = expose,
 209         [KeyPress] = keypress,
 210         [MappingNotify] = mappingnotify,
 211         [MapRequest] = maprequest,
 212         [PropertyNotify] = propertynotify,
 213         [UnmapNotify] = unmapnotify
 214 };
 215 Atom wmatom[WMLast], netatom[NetLast];
 216 Bool domwfact = True;
 217 Bool dozoom = True;
 218 Bool otherwm, readin;
 219 Bool running = True;
 220 Bool selscreen = True;
 221 Client *clients = NULL;
 222 Client *sel = NULL;
 223 Client *stack = NULL;
 224 Cursor cursor[CurLast];
 225 Display *dpy;
 226 DC dc = {0};
 227 Layout *layout = NULL;
 228 Window barwin, root;
 229 Regs *regs = NULL;
 230
 231 /* configuration, allows nested code to access above variables */
 232 #include "config.h"
 233
 234 /* function implementations */
 235 void
 236 applyrules(Client *c) {
 237         static char buf[512];
 238         unsigned int i, j;
 239         regmatch_t tmp;
 240         Bool matched = False;
 241         XClassHint ch = { 0 };
 242
 243         /* rule matching */
 244         XGetClassHint(dpy, c->win, &ch);
 245         snprintf(buf, sizeof buf, "%s:%s:%s",
 246                         ch.res_class ? ch.res_class : "",
 247                         ch.res_name ? ch.res_name : "", c->name);
 248         for(i = 0; i < LENGTH(rules); i++)
 249                 if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
 250                         c->isfloating = rules[i].isfloating;
 251                         for(j = 0; regs[i].tagregex && j < LENGTH(tags); j++) {
 252                                 if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
 253                                         matched = True;
 254                                         c->tags[j] = True;
 255                                 }
 256                         }
 257                 }
 258         if(ch.res_class)
 259                 XFree(ch.res_class);
 260         if(ch.res_name)
 261                 XFree(ch.res_name);
 262         if(!matched)
 263                 memcpy(c->tags, seltags, sizeof seltags);
 264 }
 265
 266 void
 267 arrange(void) {
 268         Client *c;
 269
 270         for(c = clients; c; c = c->next)
 271                 if(isvisible(c))
 272                         unban(c);
 273                 else
 274                         ban(c);
 275         layout->arrange();
 276         focus(NULL);
 277         restack();
 278 }
 279
 280 void
 281 attach(Client *c) {
 282         if(clients)
 283                 clients->prev = c;
 284         c->next = clients;
 285         clients = c;
 286 }
 287
 288 void
 289 attachstack(Client *c) {
 290         c->snext = stack;
 291         stack = c;
 292 }
 293
 294 void
 295 ban(Client *c) {
 296         if(c->isbanned)
 297                 return;
 298         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 299         c->isbanned = True;
 300 }
 301
 302 void
 303 buttonpress(XEvent *e) {
 304         unsigned int i, x;
 305         Client *c;
 306         XButtonPressedEvent *ev = &e->xbutton;
 307
 308         if(barwin == ev->window) {
 309                 x = 0;
 310                 for(i = 0; i < LENGTH(tags); i++) {
 311                         x += textw(tags[i]);
 312                         if(ev->x < x) {
 313                                 if(ev->button == Button1) {
 314                                         if(ev->state & MODKEY)
 315                                                 tag(tags[i]);
 316                                         else
 317                                                 view(tags[i]);
 318                                 }
 319                                 else if(ev->button == Button3) {
 320                                         if(ev->state & MODKEY)
 321                                                 toggletag(tags[i]);
 322                                         else
 323                                                 toggleview(tags[i]);
 324                                 }
 325                                 return;
 326                         }
 327                 }
 328                 if((ev->x < x + blw) && ev->button == Button1)
 329                         setlayout(NULL);
 330         }
 331         else if((c = getclient(ev->window))) {
 332                 focus(c);
 333                 if(CLEANMASK(ev->state) != MODKEY)
 334                         return;
 335                 if(ev->button == Button1) {
 336                         if((floating == layout->arrange) || c->isfloating)
 337                                 restack();
 338                         else
 339                                 togglefloating(NULL);
 340                         movemouse(c);
 341                 }
 342                 else if(ev->button == Button2) {
 343                         if((floating != layout->arrange) && !c->isfixed && c->isfloating)
 344                                 togglefloating(NULL);
 345                         else
 346                                 zoom(NULL);
 347                 }
 348                 else if(ev->button == Button3 && !c->isfixed) {
 349                         if((floating == layout->arrange) || c->isfloating)
 350                                 restack();
 351                         else
 352                                 togglefloating(NULL);
 353                         resizemouse(c);
 354                 }
 355         }
 356 }
 357
 358 void
 359 checkotherwm(void) {
 360         otherwm = False;
 361         XSetErrorHandler(xerrorstart);
 362
 363         /* this causes an error if some other window manager is running */
 364         XSelectInput(dpy, root, SubstructureRedirectMask);
 365         XSync(dpy, False);
 366         if(otherwm)
 367                 eprint("dwm: another window manager is already running\n");
 368         XSync(dpy, False);
 369         XSetErrorHandler(NULL);
 370         xerrorxlib = XSetErrorHandler(xerror);
 371         XSync(dpy, False);
 372 }
 373
 374 void
 375 cleanup(void) {
 376         close(STDIN_FILENO);
 377         while(stack) {
 378                 unban(stack);
 379                 unmanage(stack);
 380         }
 381         if(dc.font.set)
 382                 XFreeFontSet(dpy, dc.font.set);
 383         else
 384                 XFreeFont(dpy, dc.font.xfont);
 385         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 386         XFreePixmap(dpy, dc.drawable);
 387         XFreeGC(dpy, dc.gc);
 388         XDestroyWindow(dpy, barwin);
 389         XFreeCursor(dpy, cursor[CurNormal]);
 390         XFreeCursor(dpy, cursor[CurResize]);
 391         XFreeCursor(dpy, cursor[CurMove]);
 392         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 393         XSync(dpy, False);
 394 }
 395
 396 void
 397 compileregs(void) {
 398         unsigned int i;
 399         regex_t *reg;
 400
 401         if(regs)
 402                 return;
 403         regs = emallocz(LENGTH(rules) * sizeof(Regs));
 404         for(i = 0; i < LENGTH(rules); i++) {
 405                 if(rules[i].prop) {
 406                         reg = emallocz(sizeof(regex_t));
 407                         if(regcomp(reg, rules[i].prop, REG_EXTENDED))
 408                                 free(reg);
 409                         else
 410                                 regs[i].propregex = reg;
 411                 }
 412                 if(rules[i].tags) {
 413                         reg = emallocz(sizeof(regex_t));
 414                         if(regcomp(reg, rules[i].tags, REG_EXTENDED))
 415                                 free(reg);
 416                         else
 417                                 regs[i].tagregex = reg;
 418                 }
 419         }
 420 }
 421
 422 void
 423 configure(Client *c) {
 424         XConfigureEvent ce;
 425
 426         ce.type = ConfigureNotify;
 427         ce.display = dpy;
 428         ce.event = c->win;
 429         ce.window = c->win;
 430         ce.x = c->x;
 431         ce.y = c->y;
 432         ce.width = c->w;
 433         ce.height = c->h;
 434         ce.border_width = c->border;
 435         ce.above = None;
 436         ce.override_redirect = False;
 437         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 438 }
 439
 440 void
 441 configurenotify(XEvent *e) {
 442         XConfigureEvent *ev = &e->xconfigure;
 443
 444         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 445                 sw = ev->width;
 446                 sh = ev->height;
 447                 XFreePixmap(dpy, dc.drawable);
 448                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 449                 XResizeWindow(dpy, barwin, sw, bh);
 450                 updatebarpos();
 451                 arrange();
 452         }
 453 }
 454
 455 void
 456 configurerequest(XEvent *e) {
 457         Client *c;
 458         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 459         XWindowChanges wc;
 460
 461         if((c = getclient(ev->window))) {
 462                 c->ismax = False;
 463                 if(ev->value_mask & CWBorderWidth)
 464                         c->border = ev->border_width;
 465                 if(c->isfixed || c->isfloating || (floating == layout->arrange)) {
 466                         if(ev->value_mask & CWX)
 467                                 c->x = ev->x;
 468                         if(ev->value_mask & CWY)
 469                                 c->y = ev->y;
 470                         if(ev->value_mask & CWWidth)
 471                                 c->w = ev->width;
 472                         if(ev->value_mask & CWHeight)
 473                                 c->h = ev->height;
 474                         if((c->x + c->w) > sw && c->isfloating)
 475                                 c->x = sw / 2 - c->w / 2; /* center in x direction */
 476                         if((c->y + c->h) > sh && c->isfloating)
 477                                 c->y = sh / 2 - c->h / 2; /* center in y direction */
 478                         if((ev->value_mask & (CWX | CWY))
 479                         && !(ev->value_mask & (CWWidth | CWHeight)))
 480                                 configure(c);
 481                         if(isvisible(c))
 482                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 483                 }
 484                 else
 485                         configure(c);
 486         }
 487         else {
 488                 wc.x = ev->x;
 489                 wc.y = ev->y;
 490                 wc.width = ev->width;
 491                 wc.height = ev->height;
 492                 wc.border_width = ev->border_width;
 493                 wc.sibling = ev->above;
 494                 wc.stack_mode = ev->detail;
 495                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 496         }
 497         XSync(dpy, False);
 498 }
 499
 500 void
 501 destroynotify(XEvent *e) {
 502         Client *c;
 503         XDestroyWindowEvent *ev = &e->xdestroywindow;
 504
 505         if((c = getclient(ev->window)))
 506                 unmanage(c);
 507 }
 508
 509 void
 510 detach(Client *c) {
 511         if(c->prev)
 512                 c->prev->next = c->next;
 513         if(c->next)
 514                 c->next->prev = c->prev;
 515         if(c == clients)
 516                 clients = c->next;
 517         c->next = c->prev = NULL;
 518 }
 519
 520 void
 521 detachstack(Client *c) {
 522         Client **tc;
 523
 524         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 525         *tc = c->snext;
 526 }
 527
 528 void
 529 drawbar(void) {
 530         int i, x;
 531
 532         dc.x = dc.y = 0;
 533         for(i = 0; i < LENGTH(tags); i++) {
 534                 dc.w = textw(tags[i]);
 535                 if(seltags[i]) {
 536                         drawtext(tags[i], dc.sel);
 537                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel);
 538                 }
 539                 else {
 540                         drawtext(tags[i], dc.norm);
 541                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm);
 542                 }
 543                 dc.x += dc.w;
 544         }
 545         dc.w = blw;
 546         drawtext(layout->symbol, dc.norm);
 547         x = dc.x + dc.w;
 548         dc.w = textw(stext);
 549         dc.x = sw - dc.w;
 550         if(dc.x < x) {
 551                 dc.x = x;
 552                 dc.w = sw - x;
 553         }
 554         drawtext(stext, dc.norm);
 555         if((dc.w = dc.x - x) > bh) {
 556                 dc.x = x;
 557                 if(sel) {
 558                         drawtext(sel->name, dc.sel);
 559                         drawsquare(sel->ismax, sel->isfloating, dc.sel);
 560                 }
 561                 else
 562                         drawtext(NULL, dc.norm);
 563         }
 564         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 565         XSync(dpy, False);
 566 }
 567
 568 void
 569 drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) {
 570         int x;
 571         XGCValues gcv;
 572         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 573
 574         gcv.foreground = col[ColFG];
 575         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 576         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 577         r.x = dc.x + 1;
 578         r.y = dc.y + 1;
 579         if(filled) {
 580                 r.width = r.height = x + 1;
 581                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 582         }
 583         else if(empty) {
 584                 r.width = r.height = x;
 585                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 586         }
 587 }
 588
 589 void
 590 drawtext(const char *text, unsigned long col[ColLast]) {
 591         int x, y, w, h;
 592         static char buf[256];
 593         unsigned int len, olen;
 594         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 595
 596         XSetForeground(dpy, dc.gc, col[ColBG]);
 597         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 598         if(!text)
 599                 return;
 600         w = 0;
 601         olen = len = strlen(text);
 602         if(len >= sizeof buf)
 603                 len = sizeof buf - 1;
 604         memcpy(buf, text, len);
 605         buf[len] = 0;
 606         h = dc.font.ascent + dc.font.descent;
 607         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 608         x = dc.x + (h / 2);
 609         /* shorten text if necessary */
 610         while(len && (w = textnw(buf, len)) > dc.w - h)
 611                 buf[--len] = 0;
 612         if(len < olen) {
 613                 if(len > 1)
 614                         buf[len - 1] = '.';
 615                 if(len > 2)
 616                         buf[len - 2] = '.';
 617                 if(len > 3)
 618                         buf[len - 3] = '.';
 619         }
 620         if(w > dc.w)
 621                 return; /* too long */
 622         XSetForeground(dpy, dc.gc, col[ColFG]);
 623         if(dc.font.set)
 624                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 625         else
 626                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 627 }
 628
 629 void *
 630 emallocz(unsigned int size) {
 631         void *res = calloc(1, size);
 632
 633         if(!res)
 634                 eprint("fatal: could not malloc() %u bytes\n", size);
 635         return res;
 636 }
 637
 638 void
 639 enternotify(XEvent *e) {
 640         Client *c;
 641         XCrossingEvent *ev = &e->xcrossing;
 642
 643         if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
 644                 return;
 645         if((c = getclient(ev->window)))
 646                 focus(c);
 647         else if(ev->window == root) {
 648                 selscreen = True;
 649                 focus(NULL);
 650         }
 651 }
 652
 653 void
 654 eprint(const char *errstr, ...) {
 655         va_list ap;
 656
 657         va_start(ap, errstr);
 658         vfprintf(stderr, errstr, ap);
 659         va_end(ap);
 660         exit(EXIT_FAILURE);
 661 }
 662
 663 void
 664 expose(XEvent *e) {
 665         XExposeEvent *ev = &e->xexpose;
 666
 667         if(0 == ev->count) {
 668                 if(barwin == ev->window)
 669                         drawbar();
 670         }
 671 }
 672
 673 void
 674 floating(void) { /* default floating layout */
 675         Client *c;
 676
 677         domwfact = dozoom = False;
 678         for(c = clients; c; c = c->next)
 679                 if(isvisible(c))
 680                         resize(c, c->x, c->y, c->w, c->h, True);
 681 }
 682
 683 void
 684 focus(Client *c) {
 685         if((!c && selscreen) || (c && !isvisible(c)))
 686                 for(c = stack; c && !isvisible(c); c = c->snext);
 687         if(sel && sel != c) {
 688                 grabbuttons(sel, False);
 689                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 690         }
 691         if(c) {
 692                 detachstack(c);
 693                 attachstack(c);
 694                 grabbuttons(c, True);
 695         }
 696         sel = c;
 697         drawbar();
 698         if(!selscreen)
 699                 return;
 700         if(c) {
 701                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 702                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 703         }
 704         else
 705                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 706 }
 707
 708 void
 709 focusnext(const char *arg) {
 710         Client *c;
 711
 712         if(!sel)
 713                 return;
 714         for(c = sel->next; c && !isvisible(c); c = c->next);
 715         if(!c)
 716                 for(c = clients; c && !isvisible(c); c = c->next);
 717         if(c) {
 718                 focus(c);
 719                 restack();
 720         }
 721 }
 722
 723 void
 724 focusprev(const char *arg) {
 725         Client *c;
 726
 727         if(!sel)
 728                 return;
 729         for(c = sel->prev; c && !isvisible(c); c = c->prev);
 730         if(!c) {
 731                 for(c = clients; c && c->next; c = c->next);
 732                 for(; c && !isvisible(c); c = c->prev);
 733         }
 734         if(c) {
 735                 focus(c);
 736                 restack();
 737         }
 738 }
 739
 740 Client *
 741 getclient(Window w) {
 742         Client *c;
 743
 744         for(c = clients; c && c->win != w; c = c->next);
 745         return c;
 746 }
 747
 748 unsigned long
 749 getcolor(const char *colstr) {
 750         Colormap cmap = DefaultColormap(dpy, screen);
 751         XColor color;
 752
 753         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 754                 eprint("error, cannot allocate color '%s'\n", colstr);
 755         return color.pixel;
 756 }
 757
 758 long
 759 getstate(Window w) {
 760         int format, status;
 761         long result = -1;
 762         unsigned char *p = NULL;
 763         unsigned long n, extra;
 764         Atom real;
 765
 766         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 767                         &real, &format, &n, &extra, (unsigned char **)&p);
 768         if(status != Success)
 769                 return -1;
 770         if(n != 0)
 771                 result = *p;
 772         XFree(p);
 773         return result;
 774 }
 775
 776 Bool
 777 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 778         char **list = NULL;
 779         int n;
 780         XTextProperty name;
 781
 782         if(!text || 0 == size)
 783                 return False;
 784         text[0] = '\0';
 785         XGetTextProperty(dpy, w, &name, atom);
 786         if(!name.nitems)
 787                 return False;
 788         if(name.encoding == XA_STRING)
 789                 strncpy(text, (char *)name.value, size - 1);
 790         else {
 791                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 792                 && n > 0 && *list)
 793                 {
 794                         strncpy(text, *list, size - 1);
 795                         XFreeStringList(list);
 796                 }
 797         }
 798         text[size - 1] = '\0';
 799         XFree(name.value);
 800         return True;
 801 }
 802
 803 void
 804 grabbuttons(Client *c, Bool focused) {
 805         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 806
 807         if(focused) {
 808                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 809                                 GrabModeAsync, GrabModeSync, None, None);
 810                 XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
 811                                 GrabModeAsync, GrabModeSync, None, None);
 812                 XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 813                                 GrabModeAsync, GrabModeSync, None, None);
 814                 XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 815                                 GrabModeAsync, GrabModeSync, None, None);
 816
 817                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 818                                 GrabModeAsync, GrabModeSync, None, None);
 819                 XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
 820                                 GrabModeAsync, GrabModeSync, None, None);
 821                 XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 822                                 GrabModeAsync, GrabModeSync, None, None);
 823                 XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 824                                 GrabModeAsync, GrabModeSync, None, None);
 825
 826                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 827                                 GrabModeAsync, GrabModeSync, None, None);
 828                 XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
 829                                 GrabModeAsync, GrabModeSync, None, None);
 830                 XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 831                                 GrabModeAsync, GrabModeSync, None, None);
 832                 XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 833                                 GrabModeAsync, GrabModeSync, None, None);
 834         }
 835         else
 836                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 837                                 GrabModeAsync, GrabModeSync, None, None);
 838 }
 839
 840 unsigned int
 841 idxoftag(const char *tag) {
 842         unsigned int i;
 843
 844         for(i = 0; (i < LENGTH(tags)) && (tags[i] != tag); i++);
 845         return (i < LENGTH(tags)) ? i : 0;
 846 }
 847
 848 void
 849 initfont(const char *fontstr) {
 850         char *def, **missing;
 851         int i, n;
 852
 853         missing = NULL;
 854         if(dc.font.set)
 855                 XFreeFontSet(dpy, dc.font.set);
 856         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 857         if(missing) {
 858                 while(n--)
 859                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 860                 XFreeStringList(missing);
 861         }
 862         if(dc.font.set) {
 863                 XFontSetExtents *font_extents;
 864                 XFontStruct **xfonts;
 865                 char **font_names;
 866                 dc.font.ascent = dc.font.descent = 0;
 867                 font_extents = XExtentsOfFontSet(dc.font.set);
 868                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 869                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 870                         if(dc.font.ascent < (*xfonts)->ascent)
 871                                 dc.font.ascent = (*xfonts)->ascent;
 872                         if(dc.font.descent < (*xfonts)->descent)
 873                                 dc.font.descent = (*xfonts)->descent;
 874                         xfonts++;
 875                 }
 876         }
 877         else {
 878                 if(dc.font.xfont)
 879                         XFreeFont(dpy, dc.font.xfont);
 880                 dc.font.xfont = NULL;
 881                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 882                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 883                         eprint("error, cannot load font: '%s'\n", fontstr);
 884                 dc.font.ascent = dc.font.xfont->ascent;
 885                 dc.font.descent = dc.font.xfont->descent;
 886         }
 887         dc.font.height = dc.font.ascent + dc.font.descent;
 888 }
 889
 890 Bool
 891 isoccupied(unsigned int t) {
 892         Client *c;
 893
 894         for(c = clients; c; c = c->next)
 895                 if(c->tags[t])
 896                         return True;
 897         return False;
 898 }
 899
 900 Bool
 901 isprotodel(Client *c) {
 902         int i, n;
 903         Atom *protocols;
 904         Bool ret = False;
 905
 906         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 907                 for(i = 0; !ret && i < n; i++)
 908                         if(protocols[i] == wmatom[WMDelete])
 909                                 ret = True;
 910                 XFree(protocols);
 911         }
 912         return ret;
 913 }
 914
 915 Bool
 916 isvisible(Client *c) {
 917         unsigned int i;
 918
 919         for(i = 0; i < LENGTH(tags); i++)
 920                 if(c->tags[i] && seltags[i])
 921                         return True;
 922         return False;
 923 }
 924
 925 void
 926 keypress(XEvent *e) {
 927         KEYS
 928         unsigned int i;
 929         KeyCode code;
 930         KeySym keysym;
 931         XKeyEvent *ev;
 932
 933         if(!e) { /* grabkeys */
 934                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 935                 for(i = 0; i < LENGTH(keys); i++) {
 936                         code = XKeysymToKeycode(dpy, keys[i].keysym);
 937                         XGrabKey(dpy, code, keys[i].mod, root, True,
 938                                         GrabModeAsync, GrabModeAsync);
 939                         XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
 940                                         GrabModeAsync, GrabModeAsync);
 941                         XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
 942                                         GrabModeAsync, GrabModeAsync);
 943                         XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
 944                                         GrabModeAsync, GrabModeAsync);
 945                 }
 946                 return;
 947         }
 948         ev = &e->xkey;
 949         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 950         for(i = 0; i < LENGTH(keys); i++)
 951                 if(keysym == keys[i].keysym
 952                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
 953                 {
 954                         if(keys[i].func)
 955                                 keys[i].func(keys[i].arg);
 956                 }
 957 }
 958
 959 void
 960 killclient(const char *arg) {
 961         XEvent ev;
 962
 963         if(!sel)
 964                 return;
 965         if(isprotodel(sel)) {
 966                 ev.type = ClientMessage;
 967                 ev.xclient.window = sel->win;
 968                 ev.xclient.message_type = wmatom[WMProtocols];
 969                 ev.xclient.format = 32;
 970                 ev.xclient.data.l[0] = wmatom[WMDelete];
 971                 ev.xclient.data.l[1] = CurrentTime;
 972                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 973         }
 974         else
 975                 XKillClient(dpy, sel->win);
 976 }
 977
 978 void
 979 leavenotify(XEvent *e) {
 980         XCrossingEvent *ev = &e->xcrossing;
 981
 982         if((ev->window == root) && !ev->same_screen) {
 983                 selscreen = False;
 984                 focus(NULL);
 985         }
 986 }
 987
 988 void
 989 manage(Window w, XWindowAttributes *wa) {
 990         Client *c, *t = NULL;
 991         Window trans;
 992         Status rettrans;
 993         XWindowChanges wc;
 994
 995         c = emallocz(sizeof(Client));
 996         c->tags = emallocz(sizeof seltags);
 997         c->win = w;
 998         c->x = wa->x;
 999         c->y = wa->y;
1000         c->w = wa->width;
1001         c->h = wa->height;
1002         c->oldborder = wa->border_width;
1003         if(c->w == sw && c->h == sh) {
1004                 c->x = sx;
1005                 c->y = sy;
1006                 c->border = wa->border_width;
1007         }
1008         else {
1009                 if(c->x + c->w + 2 * c->border > wax + waw)
1010                         c->x = wax + waw - c->w - 2 * c->border;
1011                 if(c->y + c->h + 2 * c->border > way + wah)
1012                         c->y = way + wah - c->h - 2 * c->border;
1013                 if(c->x < wax)
1014                         c->x = wax;
1015                 if(c->y < way)
1016                         c->y = way;
1017                 c->border = BORDERPX;
1018         }
1019         wc.border_width = c->border;
1020         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1021         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1022         configure(c); /* propagates border_width, if size doesn't change */
1023         updatesizehints(c);
1024         XSelectInput(dpy, w,
1025                 StructureNotifyMask | PropertyChangeMask | EnterWindowMask);
1026         grabbuttons(c, False);
1027         updatetitle(c);
1028         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1029                 for(t = clients; t && t->win != trans; t = t->next);
1030         if(t)
1031                 memcpy(c->tags, t->tags, sizeof seltags);
1032         applyrules(c);
1033         if(!c->isfloating)
1034                 c->isfloating = (rettrans == Success) || c->isfixed;
1035         attach(c);
1036         attachstack(c);
1037         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1038         ban(c);
1039         XMapWindow(dpy, c->win);
1040         setclientstate(c, NormalState);
1041         arrange();
1042 }
1043
1044 void
1045 mappingnotify(XEvent *e) {
1046         XMappingEvent *ev = &e->xmapping;
1047
1048         XRefreshKeyboardMapping(ev);
1049         if(ev->request == MappingKeyboard)
1050                 keypress(NULL);
1051 }
1052
1053 void
1054 maprequest(XEvent *e) {
1055         static XWindowAttributes wa;
1056         XMapRequestEvent *ev = &e->xmaprequest;
1057
1058         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1059                 return;
1060         if(wa.override_redirect)
1061                 return;
1062         if(!getclient(ev->window))
1063                 manage(ev->window, &wa);
1064 }
1065
1066 void
1067 movemouse(Client *c) {
1068         int x1, y1, ocx, ocy, di, nx, ny;
1069         unsigned int dui;
1070         Window dummy;
1071         XEvent ev;
1072
1073         ocx = nx = c->x;
1074         ocy = ny = c->y;
1075         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1076                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1077                 return;
1078         c->ismax = False;
1079         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1080         for(;;) {
1081                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
1082                 switch (ev.type) {
1083                 case ButtonRelease:
1084                         XUngrabPointer(dpy, CurrentTime);
1085                         return;
1086                 case ConfigureRequest:
1087                 case Expose:
1088                 case MapRequest:
1089                         handler[ev.type](&ev);
1090                         break;
1091                 case MotionNotify:
1092                         XSync(dpy, False);
1093                         nx = ocx + (ev.xmotion.x - x1);
1094                         ny = ocy + (ev.xmotion.y - y1);
1095                         if(abs(wax + nx) < SNAP)
1096                                 nx = wax;
1097                         else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
1098                                 nx = wax + waw - c->w - 2 * c->border;
1099                         if(abs(way - ny) < SNAP)
1100                                 ny = way;
1101                         else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
1102                                 ny = way + wah - c->h - 2 * c->border;
1103                         resize(c, nx, ny, c->w, c->h, False);
1104                         break;
1105                 }
1106         }
1107 }
1108
1109 Client *
1110 nexttiled(Client *c) {
1111         for(; c && (c->isfloating || !isvisible(c)); c = c->next);
1112         return c;
1113 }
1114
1115 void
1116 propertynotify(XEvent *e) {
1117         Client *c;
1118         Window trans;
1119         XPropertyEvent *ev = &e->xproperty;
1120
1121         if(ev->state == PropertyDelete)
1122                 return; /* ignore */
1123         if((c = getclient(ev->window))) {
1124                 switch (ev->atom) {
1125                         default: break;
1126                         case XA_WM_TRANSIENT_FOR:
1127                                 XGetTransientForHint(dpy, c->win, &trans);
1128                                 if(!c->isfloating && (c->isfloating = (NULL != getclient(trans))))
1129                                         arrange();
1130                                 break;
1131                         case XA_WM_NORMAL_HINTS:
1132                                 updatesizehints(c);
1133                                 break;
1134                 }
1135                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1136                         updatetitle(c);
1137                         if(c == sel)
1138                                 drawbar();
1139                 }
1140         }
1141 }
1142
1143 void
1144 quit(const char *arg) {
1145         readin = running = False;
1146 }
1147
1148 void
1149 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1150         XWindowChanges wc;
1151
1152         if(sizehints) {
1153                 /* set minimum possible */
1154                 if (w < 1)
1155                         w = 1;
1156                 if (h < 1)
1157                         h = 1;
1158
1159                 /* temporarily remove base dimensions */
1160                 w -= c->basew;
1161                 h -= c->baseh;
1162
1163                 /* adjust for aspect limits */
1164                 if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1165                         if (w * c->maxay > h * c->maxax)
1166                                 w = h * c->maxax / c->maxay;
1167                         else if (w * c->minay < h * c->minax)
1168                                 h = w * c->minay / c->minax;
1169                 }
1170
1171                 /* adjust for increment value */
1172                 if(c->incw)
1173                         w -= w % c->incw;
1174                 if(c->inch)
1175                         h -= h % c->inch;
1176
1177                 /* restore base dimensions */
1178                 w += c->basew;
1179                 h += c->baseh;
1180
1181                 if(c->minw > 0 && w < c->minw)
1182                         w = c->minw;
1183                 if(c->minh > 0 && h < c->minh)
1184                         h = c->minh;
1185                 if(c->maxw > 0 && w > c->maxw)
1186                         w = c->maxw;
1187                 if(c->maxh > 0 && h > c->maxh)
1188                         h = c->maxh;
1189         }
1190         if(w <= 0 || h <= 0)
1191                 return;
1192         /* offscreen appearance fixes */
1193         if(x > sw)
1194                 x = sw - w - 2 * c->border;
1195         if(y > sh)
1196                 y = sh - h - 2 * c->border;
1197         if(x + w + 2 * c->border < sx)
1198                 x = sx;
1199         if(y + h + 2 * c->border < sy)
1200                 y = sy;
1201         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1202                 c->x = wc.x = x;
1203                 c->y = wc.y = y;
1204                 c->w = wc.width = w;
1205                 c->h = wc.height = h;
1206                 wc.border_width = c->border;
1207                 XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
1208                 configure(c);
1209                 XSync(dpy, False);
1210         }
1211 }
1212
1213 void
1214 resizemouse(Client *c) {
1215         int ocx, ocy;
1216         int nw, nh;
1217         XEvent ev;
1218
1219         ocx = c->x;
1220         ocy = c->y;
1221         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1222                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1223                 return;
1224         c->ismax = False;
1225         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1226         for(;;) {
1227                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
1228                 switch(ev.type) {
1229                 case ButtonRelease:
1230                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1231                                         c->w + c->border - 1, c->h + c->border - 1);
1232                         XUngrabPointer(dpy, CurrentTime);
1233                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1234                         return;
1235                 case ConfigureRequest:
1236                 case Expose:
1237                 case MapRequest:
1238                         handler[ev.type](&ev);
1239                         break;
1240                 case MotionNotify:
1241                         XSync(dpy, False);
1242                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1243                                 nw = 1;
1244                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1245                                 nh = 1;
1246                         resize(c, c->x, c->y, nw, nh, True);
1247                         break;
1248                 }
1249         }
1250 }
1251
1252 void
1253 restack(void) {
1254         Client *c;
1255         XEvent ev;
1256         XWindowChanges wc;
1257
1258         drawbar();
1259         if(!sel)
1260                 return;
1261         if(sel->isfloating || (floating == layout->arrange))
1262                 XRaiseWindow(dpy, sel->win);
1263         if(floating != layout->arrange) {
1264                 wc.stack_mode = Below;
1265                 wc.sibling = barwin;
1266                 if(!sel->isfloating) {
1267                         XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1268                         wc.sibling = sel->win;
1269                 }
1270                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1271                         if(c == sel)
1272                                 continue;
1273                         XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1274                         wc.sibling = c->win;
1275                 }
1276         }
1277         XSync(dpy, False);
1278         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1279 }
1280
1281 void
1282 run(void) {
1283         char *p;
1284         int r, xfd;
1285         fd_set rd;
1286         XEvent ev;
1287
1288         /* main event loop, also reads status text from stdin */
1289         XSync(dpy, False);
1290         xfd = ConnectionNumber(dpy);
1291         readin = True;
1292         while(running) {
1293                 FD_ZERO(&rd);
1294                 if(readin)
1295                         FD_SET(STDIN_FILENO, &rd);
1296                 FD_SET(xfd, &rd);
1297                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1298                         if(errno == EINTR)
1299                                 continue;
1300                         eprint("select failed\n");
1301                 }
1302                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1303                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
1304                         case -1:
1305                                 strncpy(stext, strerror(errno), sizeof stext - 1);
1306                                 stext[sizeof stext - 1] = '\0';
1307                                 readin = False;
1308                                 break;
1309                         case 0:
1310                                 strncpy(stext, "EOF", 4);
1311                                 readin = False;
1312                                 break;
1313                         default:
1314                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
1315                                 for(; p >= stext && *p != '\n'; --p);
1316                                 if(p > stext)
1317                                         strncpy(stext, p + 1, sizeof stext);
1318                         }
1319                         drawbar();
1320                 }
1321                 while(XPending(dpy)) {
1322                         XNextEvent(dpy, &ev);
1323                         if(handler[ev.type])
1324                                 (handler[ev.type])(&ev); /* call handler */
1325                 }
1326         }
1327 }
1328
1329 void
1330 scan(void) {
1331         unsigned int i, num;
1332         Window *wins, d1, d2;
1333         XWindowAttributes wa;
1334
1335         wins = NULL;
1336         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1337                 for(i = 0; i < num; i++) {
1338                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1339                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1340                                 continue;
1341                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1342                                 manage(wins[i], &wa);
1343                 }
1344                 for(i = 0; i < num; i++) { /* now the transients */
1345                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1346                                 continue;
1347                         if(XGetTransientForHint(dpy, wins[i], &d1)
1348                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1349                                 manage(wins[i], &wa);
1350                 }
1351         }
1352         if(wins)
1353                 XFree(wins);
1354 }
1355
1356 void
1357 setclientstate(Client *c, long state) {
1358         long data[] = {state, None};
1359
1360         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1361                         PropModeReplace, (unsigned char *)data, 2);
1362 }
1363
1364 void
1365 setlayout(const char *arg) {
1366         unsigned int i;
1367
1368         if(!arg) {
1369                 if(++layout == &layouts[LENGTH(layouts)])
1370                         layout = &layouts[0];
1371         }
1372         else {
1373                 for(i = 0; i < LENGTH(layouts); i++)
1374                         if(!strcmp(arg, layouts[i].symbol))
1375                                 break;
1376                 if(i == LENGTH(layouts))
1377                         return;
1378                 layout = &layouts[i];
1379         }
1380         if(sel)
1381                 arrange();
1382         else
1383                 drawbar();
1384 }
1385
1386 void
1387 setmwfact(const char *arg) {
1388         double delta;
1389
1390         if(!domwfact)
1391                 return;
1392         /* arg handling, manipulate mwfact */
1393         if(NULL == arg)
1394                 mwfact = MWFACT;
1395         else if(1 == sscanf(arg, "%lf", &delta)) {
1396                 if(arg[0] == '+' || arg[0] == '-')
1397                         mwfact += delta;
1398                 else
1399                         mwfact = delta;
1400                 if(mwfact < 0.1)
1401                         mwfact = 0.1;
1402                 else if(mwfact > 0.9)
1403                         mwfact = 0.9;
1404         }
1405         arrange();
1406 }
1407
1408 void
1409 setup(void) {
1410         int d;
1411         unsigned int i, j, mask;
1412         Window w;
1413         XModifierKeymap *modmap;
1414         XSetWindowAttributes wa;
1415
1416         /* init atoms */
1417         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1418         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1419         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1420         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1421         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1422         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1423         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1424                         PropModeReplace, (unsigned char *) netatom, NetLast);
1425
1426         /* init cursors */
1427         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1428         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1429         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1430
1431         /* init geometry */
1432         sx = sy = 0;
1433         sw = DisplayWidth(dpy, screen);
1434         sh = DisplayHeight(dpy, screen);
1435
1436         /* init modifier map */
1437         modmap = XGetModifierMapping(dpy);
1438         for(i = 0; i < 8; i++)
1439                 for(j = 0; j < modmap->max_keypermod; j++) {
1440                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1441                         == XKeysymToKeycode(dpy, XK_Num_Lock))
1442                                 numlockmask = (1 << i);
1443                 }
1444         XFreeModifiermap(modmap);
1445
1446         /* select for events */
1447         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1448                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1449         wa.cursor = cursor[CurNormal];
1450         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1451         XSelectInput(dpy, root, wa.event_mask);
1452
1453         /* grab keys */
1454         keypress(NULL);
1455
1456         /* init tags */
1457         compileregs();
1458
1459         /* init appearance */
1460         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1461         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1462         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1463         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1464         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1465         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1466         initfont(FONT);
1467         dc.h = bh = dc.font.height + 2;
1468
1469         /* init layouts */
1470         mwfact = MWFACT;
1471         layout = &layouts[0];
1472         for(blw = i = 0; i < LENGTH(layouts); i++) {
1473                 j = textw(layouts[i].symbol);
1474                 if(j > blw)
1475                         blw = j;
1476         }
1477
1478         /* init bar */
1479         bpos = BARPOS;
1480         wa.override_redirect = 1;
1481         wa.background_pixmap = ParentRelative;
1482         wa.event_mask = ButtonPressMask | ExposureMask;
1483         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
1484                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1485                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
1486         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1487         updatebarpos();
1488         XMapRaised(dpy, barwin);
1489         strcpy(stext, "dwm-"VERSION);
1490         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
1491         dc.gc = XCreateGC(dpy, root, 0, 0);
1492         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1493         if(!dc.font.set)
1494                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1495
1496         /* multihead support */
1497         selscreen = XQueryPointer(dpy, root, &w, &w, &d, &d, &d, &d, &mask);
1498 }
1499
1500 void
1501 spawn(const char *arg) {
1502         static char *shell = NULL;
1503
1504         if(!shell && !(shell = getenv("SHELL")))
1505                 shell = "/bin/sh";
1506         if(!arg)
1507                 return;
1508         /* The double-fork construct avoids zombie processes and keeps the code
1509          * clean from stupid signal handlers. */
1510         if(0 == fork()) {
1511                 if(0 == fork()) {
1512                         if(dpy)
1513                                 close(ConnectionNumber(dpy));
1514                         setsid();
1515                         execl(shell, shell, "-c", arg, (char *)NULL);
1516                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1517                         perror(" failed");
1518                 }
1519                 exit(0);
1520         }
1521         wait(0);
1522 }
1523
1524 void
1525 tag(const char *arg) {
1526         unsigned int i;
1527
1528         if(!sel)
1529                 return;
1530         for(i = 0; i < LENGTH(tags); i++)
1531                 sel->tags[i] = (NULL == arg);
1532         sel->tags[idxoftag(arg)] = True;
1533         arrange();
1534 }
1535
1536 unsigned int
1537 textnw(const char *text, unsigned int len) {
1538         XRectangle r;
1539
1540         if(dc.font.set) {
1541                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1542                 return r.width;
1543         }
1544         return XTextWidth(dc.font.xfont, text, len);
1545 }
1546
1547 unsigned int
1548 textw(const char *text) {
1549         return textnw(text, strlen(text)) + dc.font.height;
1550 }
1551
1552 void
1553 tile(void) {
1554         unsigned int i, n, nx, ny, nw, nh, mw, th;
1555         Client *c, *mc;
1556
1557         domwfact = dozoom = True;
1558         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
1559                 n++;
1560
1561         /* window geoms */
1562         mw = (n == 1) ? waw : mwfact * waw;
1563         th = (n > 1) ? wah / (n - 1) : 0;
1564         if(n > 1 && th < bh)
1565                 th = wah;
1566
1567         nx = wax;
1568         ny = way;
1569         nw = 0; /* gcc stupidity requires this */
1570         for(i = 0, c = mc = nexttiled(clients); c; c = nexttiled(c->next), i++) {
1571                 c->ismax = False;
1572                 if(0 == i) { /* master */
1573                         nw = mw - 2 * c->border;
1574                         nh = wah - 2 * c->border;
1575                 }
1576                 else {  /* tile window */
1577                         if(i == 1) {
1578                                 ny = way;
1579                                 nx += mc->w + 2 * mc->border;
1580                                 nw = waw - nx - 2 * c->border;
1581                         }
1582                         if(i + 1 == n) /* remainder */
1583                                 nh = (way + wah) - ny - 2 * c->border;
1584                         else
1585                                 nh = th - 2 * c->border;
1586                 }
1587                 resize(c, nx, ny, nw, nh, True);
1588                 if((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw))
1589                         /* client doesn't accept size constraints */
1590                         resize(c, nx, ny, nw, nh, False);
1591                 if(n > 1 && th != wah)
1592                         ny = c->y + c->h + 2 * c->border;
1593         }
1594 }
1595
1596 void
1597 togglebar(const char *arg) {
1598         if(bpos == BarOff)
1599                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1600         else
1601                 bpos = BarOff;
1602         updatebarpos();
1603         arrange();
1604 }
1605
1606 void
1607 togglefloating(const char *arg) {
1608         if(!sel)
1609                 return;
1610         sel->isfloating = !sel->isfloating;
1611         if(sel->isfloating)
1612                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1613         arrange();
1614 }
1615
1616 void
1617 togglemax(const char *arg) {
1618         XEvent ev;
1619
1620         if(!sel || sel->isfixed)
1621                 return;
1622         if((sel->ismax = !sel->ismax)) {
1623                 if((floating == layout->arrange) || sel->isfloating)
1624                         sel->wasfloating = True;
1625                 else {
1626                         togglefloating(NULL);
1627                         sel->wasfloating = False;
1628                 }
1629                 sel->rx = sel->x;
1630                 sel->ry = sel->y;
1631                 sel->rw = sel->w;
1632                 sel->rh = sel->h;
1633                 resize(sel, wax, way, waw - 2 * sel->border, wah - 2 * sel->border, True);
1634         }
1635         else {
1636                 resize(sel, sel->rx, sel->ry, sel->rw, sel->rh, True);
1637                 if(!sel->wasfloating)
1638                         togglefloating(NULL);
1639         }
1640         drawbar();
1641         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1642 }
1643
1644 void
1645 toggletag(const char *arg) {
1646         unsigned int i, j;
1647
1648         if(!sel)
1649                 return;
1650         i = idxoftag(arg);
1651         sel->tags[i] = !sel->tags[i];
1652         for(j = 0; j < LENGTH(tags) && !sel->tags[j]; j++);
1653         if(j == LENGTH(tags))
1654                 sel->tags[i] = True; /* at least one tag must be enabled */
1655         arrange();
1656 }
1657
1658 void
1659 toggleview(const char *arg) {
1660         unsigned int i, j;
1661
1662         i = idxoftag(arg);
1663         seltags[i] = !seltags[i];
1664         for(j = 0; j < LENGTH(tags) && !seltags[j]; j++);
1665         if(j == LENGTH(tags))
1666                 seltags[i] = True; /* at least one tag must be viewed */
1667         arrange();
1668 }
1669
1670 void
1671 unban(Client *c) {
1672         if(!c->isbanned)
1673                 return;
1674         XMoveWindow(dpy, c->win, c->x, c->y);
1675         c->isbanned = False;
1676 }
1677
1678 void
1679 unmanage(Client *c) {
1680         XWindowChanges wc;
1681
1682         wc.border_width = c->oldborder;
1683         /* The server grab construct avoids race conditions. */
1684         XGrabServer(dpy);
1685         XSetErrorHandler(xerrordummy);
1686         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1687         detach(c);
1688         detachstack(c);
1689         if(sel == c)
1690                 focus(NULL);
1691         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1692         setclientstate(c, WithdrawnState);
1693         free(c->tags);
1694         free(c);
1695         XSync(dpy, False);
1696         XSetErrorHandler(xerror);
1697         XUngrabServer(dpy);
1698         arrange();
1699 }
1700
1701 void
1702 unmapnotify(XEvent *e) {
1703         Client *c;
1704         XUnmapEvent *ev = &e->xunmap;
1705
1706         if((c = getclient(ev->window)))
1707                 unmanage(c);
1708 }
1709
1710 void
1711 updatebarpos(void) {
1712         XEvent ev;
1713
1714         wax = sx;
1715         way = sy;
1716         wah = sh;
1717         waw = sw;
1718         switch(bpos) {
1719         default:
1720                 wah -= bh;
1721                 way += bh;
1722                 XMoveWindow(dpy, barwin, sx, sy);
1723                 break;
1724         case BarBot:
1725                 wah -= bh;
1726                 XMoveWindow(dpy, barwin, sx, sy + wah);
1727                 break;
1728         case BarOff:
1729                 XMoveWindow(dpy, barwin, sx, sy - bh);
1730                 break;
1731         }
1732         XSync(dpy, False);
1733         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1734 }
1735
1736 void
1737 updatesizehints(Client *c) {
1738         long msize;
1739         XSizeHints size;
1740
1741         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1742                 size.flags = PSize;
1743         c->flags = size.flags;
1744         if(c->flags & PBaseSize) {
1745                 c->basew = size.base_width;
1746                 c->baseh = size.base_height;
1747         }
1748         else if(c->flags & PMinSize) {
1749                 c->basew = size.min_width;
1750                 c->baseh = size.min_height;
1751         }
1752         else
1753                 c->basew = c->baseh = 0;
1754         if(c->flags & PResizeInc) {
1755                 c->incw = size.width_inc;
1756                 c->inch = size.height_inc;
1757         }
1758         else
1759                 c->incw = c->inch = 0;
1760         if(c->flags & PMaxSize) {
1761                 c->maxw = size.max_width;
1762                 c->maxh = size.max_height;
1763         }
1764         else
1765                 c->maxw = c->maxh = 0;
1766         if(c->flags & PMinSize) {
1767                 c->minw = size.min_width;
1768                 c->minh = size.min_height;
1769         }
1770         else if(c->flags & PBaseSize) {
1771                 c->minw = size.base_width;
1772                 c->minh = size.base_height;
1773         }
1774         else
1775                 c->minw = c->minh = 0;
1776         if(c->flags & PAspect) {
1777                 c->minax = size.min_aspect.x;
1778                 c->maxax = size.max_aspect.x;
1779                 c->minay = size.min_aspect.y;
1780                 c->maxay = size.max_aspect.y;
1781         }
1782         else
1783                 c->minax = c->maxax = c->minay = c->maxay = 0;
1784         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1785                         && c->maxw == c->minw && c->maxh == c->minh);
1786 }
1787
1788 void
1789 updatetitle(Client *c) {
1790         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1791                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1792 }
1793
1794 /* There's no way to check accesses to destroyed windows, thus those cases are
1795  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1796  * default error handler, which may call exit.  */
1797 int
1798 xerror(Display *dpy, XErrorEvent *ee) {
1799         if(ee->error_code == BadWindow
1800         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1801         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1802         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1803         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1804         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1805         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1806         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1807                 return 0;
1808         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1809                 ee->request_code, ee->error_code);
1810         return xerrorxlib(dpy, ee); /* may call exit */
1811 }
1812
1813 int
1814 xerrordummy(Display *dsply, XErrorEvent *ee) {
1815         return 0;
1816 }
1817
1818 /* Startup Error handler to check if another window manager
1819  * is already running. */
1820 int
1821 xerrorstart(Display *dsply, XErrorEvent *ee) {
1822         otherwm = True;
1823         return -1;
1824 }
1825
1826 void
1827 view(const char *arg) {
1828         unsigned int i;
1829
1830         memcpy(prevtags, seltags, sizeof seltags);
1831         for(i = 0; i < LENGTH(tags); i++)
1832                 seltags[i] = (NULL == arg);
1833         seltags[idxoftag(arg)] = True;
1834         arrange();
1835 }
1836
1837 void
1838 viewprevtag(const char *arg) {
1839         static Bool tmptags[sizeof tags / sizeof tags[0]];
1840
1841         memcpy(tmptags, seltags, sizeof seltags);
1842         memcpy(seltags, prevtags, sizeof seltags);
1843         memcpy(prevtags, tmptags, sizeof seltags);
1844         arrange();
1845 }
1846
1847 void
1848 zoom(const char *arg) {
1849         Client *c;
1850
1851         if(!sel || !dozoom || sel->isfloating)
1852                 return;
1853         if((c = sel) == nexttiled(clients))
1854                 if(!(c = nexttiled(c->next)))
1855                         return;
1856         detach(c);
1857         attach(c);
1858         focus(c);
1859         arrange();
1860 }
1861
1862 int
1863 main(int argc, char *argv[]) {
1864         if(argc == 2 && !strcmp("-v", argv[1]))
1865                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
1866         else if(argc != 1)
1867                 eprint("usage: dwm [-v]\n");
1868
1869         setlocale(LC_CTYPE, "");
1870         if(!(dpy = XOpenDisplay(0)))
1871                 eprint("dwm: cannot open display\n");
1872         screen = DefaultScreen(dpy);
1873         root = RootWindow(dpy, screen);
1874
1875         checkotherwm();
1876         setup();
1877         drawbar();
1878         scan();
1879         run();
1880         cleanup();
1881
1882         XCloseDisplay(dpy);
1883         return 0;
1884 }