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 isarrange(void (*func)());
 149 Bool isoccupied(unsigned int t);
 150 Bool isprotodel(Client *c);
 151 Bool isvisible(Client *c);
 152 void keypress(XEvent *e);
 153 void killclient(const char *arg);
 154 void leavenotify(XEvent *e);
 155 void manage(Window w, XWindowAttributes *wa);
 156 void mappingnotify(XEvent *e);
 157 void maprequest(XEvent *e);
 158 void movemouse(Client *c);
 159 Client *nexttiled(Client *c);
 160 void propertynotify(XEvent *e);
 161 void quit(const char *arg);
 162 void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 163 void resizemouse(Client *c);
 164 void restack(void);
 165 void run(void);
 166 void scan(void);
 167 void setclientstate(Client *c, long state);
 168 void setlayout(const char *arg);
 169 void setmwfact(const char *arg);
 170 void setup(void);
 171 void spawn(const char *arg);
 172 void tag(const char *arg);
 173 unsigned int textnw(const char *text, unsigned int len);
 174 unsigned int textw(const char *text);
 175 void tile(void);
 176 void togglebar(const char *arg);
 177 void togglefloating(const char *arg);
 178 void togglemax(const char *arg);
 179 void toggletag(const char *arg);
 180 void toggleview(const char *arg);
 181 void unban(Client *c);
 182 void unmanage(Client *c);
 183 void unmapnotify(XEvent *e);
 184 void updatebarpos(void);
 185 void updatesizehints(Client *c);
 186 void updatetitle(Client *c);
 187 void view(const char *arg);
 188 void viewprevtag(const char *arg);      /* views previous selected tags */
 189 int xerror(Display *dpy, XErrorEvent *ee);
 190 int xerrordummy(Display *dsply, XErrorEvent *ee);
 191 int xerrorstart(Display *dsply, XErrorEvent *ee);
 192 void zoom(const char *arg);
 193
 194 /* variables */
 195 char stext[256];
 196 double mwfact;
 197 int screen, sx, sy, sw, sh, wax, way, waw, wah;
 198 int (*xerrorxlib)(Display *, XErrorEvent *);
 199 unsigned int bh, bpos;
 200 unsigned int blw = 0;
 201 unsigned int ltidx = 0; /* default */
 202 unsigned int nlayouts = 0;
 203 unsigned int nrules = 0;
 204 unsigned int numlockmask = 0;
 205 void (*handler[LASTEvent]) (XEvent *) = {
 206         [ButtonPress] = buttonpress,
 207         [ConfigureRequest] = configurerequest,
 208         [ConfigureNotify] = configurenotify,
 209         [DestroyNotify] = destroynotify,
 210         [EnterNotify] = enternotify,
 211         [LeaveNotify] = leavenotify,
 212         [Expose] = expose,
 213         [KeyPress] = keypress,
 214         [MappingNotify] = mappingnotify,
 215         [MapRequest] = maprequest,
 216         [PropertyNotify] = propertynotify,
 217         [UnmapNotify] = unmapnotify
 218 };
 219 Atom wmatom[WMLast], netatom[NetLast];
 220 Bool otherwm, readin;
 221 Bool running = True;
 222 Bool selscreen = True;
 223 Client *clients = NULL;
 224 Client *sel = NULL;
 225 Client *stack = NULL;
 226 Cursor cursor[CurLast];
 227 Display *dpy;
 228 DC dc = {0};
 229 Window barwin, root;
 230 Regs *regs = NULL;
 231
 232 /* configuration, allows nested code to access above variables */
 233 #include "config.h"
 234
 235 #define NTAGS (sizeof tags / sizeof tags[0])
 236 Bool seltags[NTAGS] = {[0] = True};
 237 Bool prevtags[NTAGS] = {[0] = True};
 238
 239 /* function implementations */
 240 void
 241 applyrules(Client *c) {
 242         static char buf[512];
 243         unsigned int i, j;
 244         regmatch_t tmp;
 245         Bool matched = False;
 246         XClassHint ch = { 0 };
 247
 248         /* rule matching */
 249         XGetClassHint(dpy, c->win, &ch);
 250         snprintf(buf, sizeof buf, "%s:%s:%s",
 251                         ch.res_class ? ch.res_class : "",
 252                         ch.res_name ? ch.res_name : "", c->name);
 253         for(i = 0; i < nrules; i++)
 254                 if(regs[i].propregex && !regexec(regs[i].propregex, buf, 1, &tmp, 0)) {
 255                         c->isfloating = rules[i].isfloating;
 256                         for(j = 0; regs[i].tagregex && j < NTAGS; j++) {
 257                                 if(!regexec(regs[i].tagregex, tags[j], 1, &tmp, 0)) {
 258                                         matched = True;
 259                                         c->tags[j] = True;
 260                                 }
 261                         }
 262                 }
 263         if(ch.res_class)
 264                 XFree(ch.res_class);
 265         if(ch.res_name)
 266                 XFree(ch.res_name);
 267         if(!matched)
 268                 memcpy(c->tags, seltags, sizeof seltags);
 269 }
 270
 271 void
 272 arrange(void) {
 273         Client *c;
 274
 275         for(c = clients; c; c = c->next)
 276                 if(isvisible(c))
 277                         unban(c);
 278                 else
 279                         ban(c);
 280         layouts[ltidx].arrange();
 281         focus(NULL);
 282         restack();
 283 }
 284
 285 void
 286 attach(Client *c) {
 287         if(clients)
 288                 clients->prev = c;
 289         c->next = clients;
 290         clients = c;
 291 }
 292
 293 void
 294 attachstack(Client *c) {
 295         c->snext = stack;
 296         stack = c;
 297 }
 298
 299 void
 300 ban(Client *c) {
 301         if(c->isbanned)
 302                 return;
 303         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 304         c->isbanned = True;
 305 }
 306
 307 void
 308 buttonpress(XEvent *e) {
 309         unsigned int i, x;
 310         Client *c;
 311         XButtonPressedEvent *ev = &e->xbutton;
 312
 313         if(barwin == ev->window) {
 314                 x = 0;
 315                 for(i = 0; i < NTAGS; i++) {
 316                         x += textw(tags[i]);
 317                         if(ev->x < x) {
 318                                 if(ev->button == Button1) {
 319                                         if(ev->state & MODKEY)
 320                                                 tag(tags[i]);
 321                                         else
 322                                                 view(tags[i]);
 323                                 }
 324                                 else if(ev->button == Button3) {
 325                                         if(ev->state & MODKEY)
 326                                                 toggletag(tags[i]);
 327                                         else
 328                                                 toggleview(tags[i]);
 329                                 }
 330                                 return;
 331                         }
 332                 }
 333                 if((ev->x < x + blw) && ev->button == Button1)
 334                         setlayout(NULL);
 335         }
 336         else if((c = getclient(ev->window))) {
 337                 focus(c);
 338                 if(CLEANMASK(ev->state) != MODKEY)
 339                         return;
 340                 if(ev->button == Button1) {
 341                         if(isarrange(floating) || c->isfloating)
 342                                 restack();
 343                         else
 344                                 togglefloating(NULL);
 345                         movemouse(c);
 346                 }
 347                 else if(ev->button == Button2) {
 348                         if((ISTILE) && !c->isfixed && c->isfloating)
 349                                 togglefloating(NULL);
 350                         else
 351                                 zoom(NULL);
 352                 }
 353                 else if(ev->button == Button3 && !c->isfixed) {
 354                         if(isarrange(floating) || c->isfloating)
 355                                 restack();
 356                         else
 357                                 togglefloating(NULL);
 358                         resizemouse(c);
 359                 }
 360         }
 361 }
 362
 363 void
 364 checkotherwm(void) {
 365         otherwm = False;
 366         XSetErrorHandler(xerrorstart);
 367
 368         /* this causes an error if some other window manager is running */
 369         XSelectInput(dpy, root, SubstructureRedirectMask);
 370         XSync(dpy, False);
 371         if(otherwm)
 372                 eprint("dwm: another window manager is already running\n");
 373         XSync(dpy, False);
 374         XSetErrorHandler(NULL);
 375         xerrorxlib = XSetErrorHandler(xerror);
 376         XSync(dpy, False);
 377 }
 378
 379 void
 380 cleanup(void) {
 381         close(STDIN_FILENO);
 382         while(stack) {
 383                 unban(stack);
 384                 unmanage(stack);
 385         }
 386         if(dc.font.set)
 387                 XFreeFontSet(dpy, dc.font.set);
 388         else
 389                 XFreeFont(dpy, dc.font.xfont);
 390         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 391         XFreePixmap(dpy, dc.drawable);
 392         XFreeGC(dpy, dc.gc);
 393         XDestroyWindow(dpy, barwin);
 394         XFreeCursor(dpy, cursor[CurNormal]);
 395         XFreeCursor(dpy, cursor[CurResize]);
 396         XFreeCursor(dpy, cursor[CurMove]);
 397         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 398         XSync(dpy, False);
 399 }
 400
 401 void
 402 compileregs(void) {
 403         unsigned int i;
 404         regex_t *reg;
 405
 406         if(regs)
 407                 return;
 408         nrules = sizeof rules / sizeof rules[0];
 409         regs = emallocz(nrules * sizeof(Regs));
 410         for(i = 0; i < nrules; i++) {
 411                 if(rules[i].prop) {
 412                         reg = emallocz(sizeof(regex_t));
 413                         if(regcomp(reg, rules[i].prop, REG_EXTENDED))
 414                                 free(reg);
 415                         else
 416                                 regs[i].propregex = reg;
 417                 }
 418                 if(rules[i].tags) {
 419                         reg = emallocz(sizeof(regex_t));
 420                         if(regcomp(reg, rules[i].tags, REG_EXTENDED))
 421                                 free(reg);
 422                         else
 423                                 regs[i].tagregex = reg;
 424                 }
 425         }
 426 }
 427
 428 void
 429 configure(Client *c) {
 430         XConfigureEvent ce;
 431
 432         ce.type = ConfigureNotify;
 433         ce.display = dpy;
 434         ce.event = c->win;
 435         ce.window = c->win;
 436         ce.x = c->x;
 437         ce.y = c->y;
 438         ce.width = c->w;
 439         ce.height = c->h;
 440         ce.border_width = c->border;
 441         ce.above = None;
 442         ce.override_redirect = False;
 443         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 444 }
 445
 446 void
 447 configurenotify(XEvent *e) {
 448         XConfigureEvent *ev = &e->xconfigure;
 449
 450         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 451                 sw = ev->width;
 452                 sh = ev->height;
 453                 XFreePixmap(dpy, dc.drawable);
 454                 dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 455                 XResizeWindow(dpy, barwin, sw, bh);
 456                 updatebarpos();
 457                 arrange();
 458         }
 459 }
 460
 461 void
 462 configurerequest(XEvent *e) {
 463         Client *c;
 464         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 465         XWindowChanges wc;
 466
 467         if((c = getclient(ev->window))) {
 468                 c->ismax = False;
 469                 if(ev->value_mask & CWBorderWidth)
 470                         c->border = ev->border_width;
 471                 if(c->isfixed || c->isfloating || isarrange(floating)) {
 472                         if(ev->value_mask & CWX)
 473                                 c->x = ev->x;
 474                         if(ev->value_mask & CWY)
 475                                 c->y = 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 + c->w) > sw && c->isfloating)
 481                                 c->x = sw / 2 - c->w / 2; /* center in x direction */
 482                         if((c->y + c->h) > sh && c->isfloating)
 483                                 c->y = sh / 2 - c->h / 2; /* center in y direction */
 484                         if((ev->value_mask & (CWX | CWY))
 485                         && !(ev->value_mask & (CWWidth | CWHeight)))
 486                                 configure(c);
 487                         if(isvisible(c))
 488                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 489                 }
 490                 else
 491                         configure(c);
 492         }
 493         else {
 494                 wc.x = ev->x;
 495                 wc.y = ev->y;
 496                 wc.width = ev->width;
 497                 wc.height = ev->height;
 498                 wc.border_width = ev->border_width;
 499                 wc.sibling = ev->above;
 500                 wc.stack_mode = ev->detail;
 501                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 502         }
 503         XSync(dpy, False);
 504 }
 505
 506 void
 507 destroynotify(XEvent *e) {
 508         Client *c;
 509         XDestroyWindowEvent *ev = &e->xdestroywindow;
 510
 511         if((c = getclient(ev->window)))
 512                 unmanage(c);
 513 }
 514
 515 void
 516 detach(Client *c) {
 517         if(c->prev)
 518                 c->prev->next = c->next;
 519         if(c->next)
 520                 c->next->prev = c->prev;
 521         if(c == clients)
 522                 clients = c->next;
 523         c->next = c->prev = NULL;
 524 }
 525
 526 void
 527 detachstack(Client *c) {
 528         Client **tc;
 529
 530         for(tc=&stack; *tc && *tc != c; tc=&(*tc)->snext);
 531         *tc = c->snext;
 532 }
 533
 534 void
 535 drawbar(void) {
 536         int i, x;
 537
 538         dc.x = dc.y = 0;
 539         for(i = 0; i < NTAGS; i++) {
 540                 dc.w = textw(tags[i]);
 541                 if(seltags[i]) {
 542                         drawtext(tags[i], dc.sel);
 543                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel);
 544                 }
 545                 else {
 546                         drawtext(tags[i], dc.norm);
 547                         drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm);
 548                 }
 549                 dc.x += dc.w;
 550         }
 551         dc.w = blw;
 552         drawtext(layouts[ltidx].symbol, dc.norm);
 553         x = dc.x + dc.w;
 554         dc.w = textw(stext);
 555         dc.x = sw - dc.w;
 556         if(dc.x < x) {
 557                 dc.x = x;
 558                 dc.w = sw - x;
 559         }
 560         drawtext(stext, dc.norm);
 561         if((dc.w = dc.x - x) > bh) {
 562                 dc.x = x;
 563                 if(sel) {
 564                         drawtext(sel->name, dc.sel);
 565                         drawsquare(sel->ismax, sel->isfloating, dc.sel);
 566                 }
 567                 else
 568                         drawtext(NULL, dc.norm);
 569         }
 570         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0);
 571         XSync(dpy, False);
 572 }
 573
 574 void
 575 drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) {
 576         int x;
 577         XGCValues gcv;
 578         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 579
 580         gcv.foreground = col[ColFG];
 581         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 582         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 583         r.x = dc.x + 1;
 584         r.y = dc.y + 1;
 585         if(filled) {
 586                 r.width = r.height = x + 1;
 587                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 588         }
 589         else if(empty) {
 590                 r.width = r.height = x;
 591                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 592         }
 593 }
 594
 595 void
 596 drawtext(const char *text, unsigned long col[ColLast]) {
 597         int x, y, w, h;
 598         static char buf[256];
 599         unsigned int len, olen;
 600         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 601
 602         XSetForeground(dpy, dc.gc, col[ColBG]);
 603         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 604         if(!text)
 605                 return;
 606         w = 0;
 607         olen = len = strlen(text);
 608         if(len >= sizeof buf)
 609                 len = sizeof buf - 1;
 610         memcpy(buf, text, len);
 611         buf[len] = 0;
 612         h = dc.font.ascent + dc.font.descent;
 613         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 614         x = dc.x + (h / 2);
 615         /* shorten text if necessary */
 616         while(len && (w = textnw(buf, len)) > dc.w - h)
 617                 buf[--len] = 0;
 618         if(len < olen) {
 619                 if(len > 1)
 620                         buf[len - 1] = '.';
 621                 if(len > 2)
 622                         buf[len - 2] = '.';
 623                 if(len > 3)
 624                         buf[len - 3] = '.';
 625         }
 626         if(w > dc.w)
 627                 return; /* too long */
 628         XSetForeground(dpy, dc.gc, col[ColFG]);
 629         if(dc.font.set)
 630                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 631         else
 632                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 633 }
 634
 635 void *
 636 emallocz(unsigned int size) {
 637         void *res = calloc(1, size);
 638
 639         if(!res)
 640                 eprint("fatal: could not malloc() %u bytes\n", size);
 641         return res;
 642 }
 643
 644 void
 645 enternotify(XEvent *e) {
 646         Client *c;
 647         XCrossingEvent *ev = &e->xcrossing;
 648
 649         if(ev->mode != NotifyNormal || ev->detail == NotifyInferior)
 650                 return;
 651         if((c = getclient(ev->window)))
 652                 focus(c);
 653         else if(ev->window == root) {
 654                 selscreen = True;
 655                 focus(NULL);
 656         }
 657 }
 658
 659 void
 660 eprint(const char *errstr, ...) {
 661         va_list ap;
 662
 663         va_start(ap, errstr);
 664         vfprintf(stderr, errstr, ap);
 665         va_end(ap);
 666         exit(EXIT_FAILURE);
 667 }
 668
 669 void
 670 expose(XEvent *e) {
 671         XExposeEvent *ev = &e->xexpose;
 672
 673         if(ev->count == 0) {
 674                 if(barwin == ev->window)
 675                         drawbar();
 676         }
 677 }
 678
 679 void
 680 floating(void) { /* default floating layout */
 681         Client *c;
 682
 683         for(c = clients; c; c = c->next)
 684                 if(isvisible(c))
 685                         resize(c, c->x, c->y, c->w, c->h, True);
 686 }
 687
 688 void
 689 focus(Client *c) {
 690         if((!c && selscreen) || (c && !isvisible(c)))
 691                 for(c = stack; c && !isvisible(c); c = c->snext);
 692         if(sel && sel != c) {
 693                 grabbuttons(sel, False);
 694                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 695         }
 696         if(c) {
 697                 detachstack(c);
 698                 attachstack(c);
 699                 grabbuttons(c, True);
 700         }
 701         sel = c;
 702         drawbar();
 703         if(!selscreen)
 704                 return;
 705         if(c) {
 706                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 707                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 708         }
 709         else
 710                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 711 }
 712
 713 void
 714 focusnext(const char *arg) {
 715         Client *c;
 716
 717         if(!sel)
 718                 return;
 719         for(c = sel->next; c && !isvisible(c); c = c->next);
 720         if(!c)
 721                 for(c = clients; c && !isvisible(c); c = c->next);
 722         if(c) {
 723                 focus(c);
 724                 restack();
 725         }
 726 }
 727
 728 void
 729 focusprev(const char *arg) {
 730         Client *c;
 731
 732         if(!sel)
 733                 return;
 734         for(c = sel->prev; c && !isvisible(c); c = c->prev);
 735         if(!c) {
 736                 for(c = clients; c && c->next; c = c->next);
 737                 for(; c && !isvisible(c); c = c->prev);
 738         }
 739         if(c) {
 740                 focus(c);
 741                 restack();
 742         }
 743 }
 744
 745 Client *
 746 getclient(Window w) {
 747         Client *c;
 748
 749         for(c = clients; c && c->win != w; c = c->next);
 750         return c;
 751 }
 752
 753 unsigned long
 754 getcolor(const char *colstr) {
 755         Colormap cmap = DefaultColormap(dpy, screen);
 756         XColor color;
 757
 758         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 759                 eprint("error, cannot allocate color '%s'\n", colstr);
 760         return color.pixel;
 761 }
 762
 763 long
 764 getstate(Window w) {
 765         int format, status;
 766         long result = -1;
 767         unsigned char *p = NULL;
 768         unsigned long n, extra;
 769         Atom real;
 770
 771         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 772                         &real, &format, &n, &extra, (unsigned char **)&p);
 773         if(status != Success)
 774                 return -1;
 775         if(n != 0)
 776                 result = *p;
 777         XFree(p);
 778         return result;
 779 }
 780
 781 Bool
 782 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 783         char **list = NULL;
 784         int n;
 785         XTextProperty name;
 786
 787         if(!text || size == 0)
 788                 return False;
 789         text[0] = '\0';
 790         XGetTextProperty(dpy, w, &name, atom);
 791         if(!name.nitems)
 792                 return False;
 793         if(name.encoding == XA_STRING)
 794                 strncpy(text, (char *)name.value, size - 1);
 795         else {
 796                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 797                 && n > 0 && *list)
 798                 {
 799                         strncpy(text, *list, size - 1);
 800                         XFreeStringList(list);
 801                 }
 802         }
 803         text[size - 1] = '\0';
 804         XFree(name.value);
 805         return True;
 806 }
 807
 808 void
 809 grabbuttons(Client *c, Bool focused) {
 810         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 811
 812         if(focused) {
 813                 XGrabButton(dpy, Button1, MODKEY, c->win, False, BUTTONMASK,
 814                                 GrabModeAsync, GrabModeSync, None, None);
 815                 XGrabButton(dpy, Button1, MODKEY | LockMask, c->win, False, BUTTONMASK,
 816                                 GrabModeAsync, GrabModeSync, None, None);
 817                 XGrabButton(dpy, Button1, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 818                                 GrabModeAsync, GrabModeSync, None, None);
 819                 XGrabButton(dpy, Button1, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 820                                 GrabModeAsync, GrabModeSync, None, None);
 821
 822                 XGrabButton(dpy, Button2, MODKEY, c->win, False, BUTTONMASK,
 823                                 GrabModeAsync, GrabModeSync, None, None);
 824                 XGrabButton(dpy, Button2, MODKEY | LockMask, c->win, False, BUTTONMASK,
 825                                 GrabModeAsync, GrabModeSync, None, None);
 826                 XGrabButton(dpy, Button2, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 827                                 GrabModeAsync, GrabModeSync, None, None);
 828                 XGrabButton(dpy, Button2, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 829                                 GrabModeAsync, GrabModeSync, None, None);
 830
 831                 XGrabButton(dpy, Button3, MODKEY, c->win, False, BUTTONMASK,
 832                                 GrabModeAsync, GrabModeSync, None, None);
 833                 XGrabButton(dpy, Button3, MODKEY | LockMask, c->win, False, BUTTONMASK,
 834                                 GrabModeAsync, GrabModeSync, None, None);
 835                 XGrabButton(dpy, Button3, MODKEY | numlockmask, c->win, False, BUTTONMASK,
 836                                 GrabModeAsync, GrabModeSync, None, None);
 837                 XGrabButton(dpy, Button3, MODKEY | numlockmask | LockMask, c->win, False, BUTTONMASK,
 838                                 GrabModeAsync, GrabModeSync, None, None);
 839         }
 840         else
 841                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False, BUTTONMASK,
 842                                 GrabModeAsync, GrabModeSync, None, None);
 843 }
 844
 845 unsigned int
 846 idxoftag(const char *tag) {
 847         unsigned int i;
 848
 849         for(i = 0; (i < NTAGS) && (tags[i] != tag); i++);
 850         return (i < NTAGS) ? i : 0;
 851 }
 852
 853 void
 854 initfont(const char *fontstr) {
 855         char *def, **missing;
 856         int i, n;
 857
 858         missing = NULL;
 859         if(dc.font.set)
 860                 XFreeFontSet(dpy, dc.font.set);
 861         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 862         if(missing) {
 863                 while(n--)
 864                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 865                 XFreeStringList(missing);
 866         }
 867         if(dc.font.set) {
 868                 XFontSetExtents *font_extents;
 869                 XFontStruct **xfonts;
 870                 char **font_names;
 871                 dc.font.ascent = dc.font.descent = 0;
 872                 font_extents = XExtentsOfFontSet(dc.font.set);
 873                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 874                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 875                         if(dc.font.ascent < (*xfonts)->ascent)
 876                                 dc.font.ascent = (*xfonts)->ascent;
 877                         if(dc.font.descent < (*xfonts)->descent)
 878                                 dc.font.descent = (*xfonts)->descent;
 879                         xfonts++;
 880                 }
 881         }
 882         else {
 883                 if(dc.font.xfont)
 884                         XFreeFont(dpy, dc.font.xfont);
 885                 dc.font.xfont = NULL;
 886                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 887                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 888                         eprint("error, cannot load font: '%s'\n", fontstr);
 889                 dc.font.ascent = dc.font.xfont->ascent;
 890                 dc.font.descent = dc.font.xfont->descent;
 891         }
 892         dc.font.height = dc.font.ascent + dc.font.descent;
 893 }
 894
 895 Bool
 896 isarrange(void (*func)())
 897 {
 898         return func == layouts[ltidx].arrange;
 899 }
 900
 901 Bool
 902 isoccupied(unsigned int t) {
 903         Client *c;
 904
 905         for(c = clients; c; c = c->next)
 906                 if(c->tags[t])
 907                         return True;
 908         return False;
 909 }
 910
 911 Bool
 912 isprotodel(Client *c) {
 913         int i, n;
 914         Atom *protocols;
 915         Bool ret = False;
 916
 917         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 918                 for(i = 0; !ret && i < n; i++)
 919                         if(protocols[i] == wmatom[WMDelete])
 920                                 ret = True;
 921                 XFree(protocols);
 922         }
 923         return ret;
 924 }
 925
 926 Bool
 927 isvisible(Client *c) {
 928         unsigned int i;
 929
 930         for(i = 0; i < NTAGS; i++)
 931                 if(c->tags[i] && seltags[i])
 932                         return True;
 933         return False;
 934 }
 935
 936 void
 937 keypress(XEvent *e) {
 938         KEYS
 939         unsigned int len = sizeof keys / sizeof keys[0];
 940         unsigned int i;
 941         KeyCode code;
 942         KeySym keysym;
 943         XKeyEvent *ev;
 944
 945         if(!e) { /* grabkeys */
 946                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
 947                 for(i = 0; i < len; i++) {
 948                         code = XKeysymToKeycode(dpy, keys[i].keysym);
 949                         XGrabKey(dpy, code, keys[i].mod, root, True,
 950                                         GrabModeAsync, GrabModeAsync);
 951                         XGrabKey(dpy, code, keys[i].mod | LockMask, root, True,
 952                                         GrabModeAsync, GrabModeAsync);
 953                         XGrabKey(dpy, code, keys[i].mod | numlockmask, root, True,
 954                                         GrabModeAsync, GrabModeAsync);
 955                         XGrabKey(dpy, code, keys[i].mod | numlockmask | LockMask, root, True,
 956                                         GrabModeAsync, GrabModeAsync);
 957                 }
 958                 return;
 959         }
 960         ev = &e->xkey;
 961         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 962         for(i = 0; i < len; i++)
 963                 if(keysym == keys[i].keysym
 964                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state))
 965                 {
 966                         if(keys[i].func)
 967                                 keys[i].func(keys[i].arg);
 968                 }
 969 }
 970
 971 void
 972 killclient(const char *arg) {
 973         XEvent ev;
 974
 975         if(!sel)
 976                 return;
 977         if(isprotodel(sel)) {
 978                 ev.type = ClientMessage;
 979                 ev.xclient.window = sel->win;
 980                 ev.xclient.message_type = wmatom[WMProtocols];
 981                 ev.xclient.format = 32;
 982                 ev.xclient.data.l[0] = wmatom[WMDelete];
 983                 ev.xclient.data.l[1] = CurrentTime;
 984                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 985         }
 986         else
 987                 XKillClient(dpy, sel->win);
 988 }
 989
 990 void
 991 leavenotify(XEvent *e) {
 992         XCrossingEvent *ev = &e->xcrossing;
 993
 994         if((ev->window == root) && !ev->same_screen) {
 995                 selscreen = False;
 996                 focus(NULL);
 997         }
 998 }
 999
1000 void
1001 manage(Window w, XWindowAttributes *wa) {
1002         Client *c, *t = NULL;
1003         Window trans;
1004         Status rettrans;
1005         XWindowChanges wc;
1006
1007         c = emallocz(sizeof(Client));
1008         c->tags = emallocz(sizeof seltags);
1009         c->win = w;
1010         c->x = wa->x;
1011         c->y = wa->y;
1012         c->w = wa->width;
1013         c->h = wa->height;
1014         c->oldborder = wa->border_width;
1015         if(c->w == sw && c->h == sh) {
1016                 c->x = sx;
1017                 c->y = sy;
1018                 c->border = wa->border_width;
1019         }
1020         else {
1021                 if(c->x + c->w + 2 * c->border > wax + waw)
1022                         c->x = wax + waw - c->w - 2 * c->border;
1023                 if(c->y + c->h + 2 * c->border > way + wah)
1024                         c->y = way + wah - c->h - 2 * c->border;
1025                 if(c->x < wax)
1026                         c->x = wax;
1027                 if(c->y < way)
1028                         c->y = way;
1029                 c->border = BORDERPX;
1030         }
1031         wc.border_width = c->border;
1032         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1033         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
1034         configure(c); /* propagates border_width, if size doesn't change */
1035         updatesizehints(c);
1036         XSelectInput(dpy, w,
1037                 StructureNotifyMask | PropertyChangeMask | EnterWindowMask);
1038         grabbuttons(c, False);
1039         updatetitle(c);
1040         if((rettrans = XGetTransientForHint(dpy, w, &trans) == Success))
1041                 for(t = clients; t && t->win != trans; t = t->next);
1042         if(t)
1043                 memcpy(c->tags, t->tags, sizeof seltags);
1044         applyrules(c);
1045         if(!c->isfloating)
1046                 c->isfloating = (rettrans == Success) || c->isfixed;
1047         attach(c);
1048         attachstack(c);
1049         XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h); /* some windows require this */
1050         ban(c);
1051         XMapWindow(dpy, c->win);
1052         setclientstate(c, NormalState);
1053         arrange();
1054 }
1055
1056 void
1057 mappingnotify(XEvent *e) {
1058         XMappingEvent *ev = &e->xmapping;
1059
1060         XRefreshKeyboardMapping(ev);
1061         if(ev->request == MappingKeyboard)
1062                 keypress(NULL);
1063 }
1064
1065 void
1066 maprequest(XEvent *e) {
1067         static XWindowAttributes wa;
1068         XMapRequestEvent *ev = &e->xmaprequest;
1069
1070         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1071                 return;
1072         if(wa.override_redirect)
1073                 return;
1074         if(!getclient(ev->window))
1075                 manage(ev->window, &wa);
1076 }
1077
1078 void
1079 movemouse(Client *c) {
1080         int x1, y1, ocx, ocy, di, nx, ny;
1081         unsigned int dui;
1082         Window dummy;
1083         XEvent ev;
1084
1085         ocx = nx = c->x;
1086         ocy = ny = c->y;
1087         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1088                         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1089                 return;
1090         c->ismax = False;
1091         XQueryPointer(dpy, root, &dummy, &dummy, &x1, &y1, &di, &di, &dui);
1092         for(;;) {
1093                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask, &ev);
1094                 switch (ev.type) {
1095                 case ButtonRelease:
1096                         XUngrabPointer(dpy, CurrentTime);
1097                         return;
1098                 case ConfigureRequest:
1099                 case Expose:
1100                 case MapRequest:
1101                         handler[ev.type](&ev);
1102                         break;
1103                 case MotionNotify:
1104                         XSync(dpy, False);
1105                         nx = ocx + (ev.xmotion.x - x1);
1106                         ny = ocy + (ev.xmotion.y - y1);
1107                         if(abs(wax + nx) < SNAP)
1108                                 nx = wax;
1109                         else if(abs((wax + waw) - (nx + c->w + 2 * c->border)) < SNAP)
1110                                 nx = wax + waw - c->w - 2 * c->border;
1111                         if(abs(way - ny) < SNAP)
1112                                 ny = way;
1113                         else if(abs((way + wah) - (ny + c->h + 2 * c->border)) < SNAP)
1114                                 ny = way + wah - c->h - 2 * c->border;
1115                         resize(c, nx, ny, c->w, c->h, False);
1116                         break;
1117                 }
1118         }
1119 }
1120
1121 Client *
1122 nexttiled(Client *c) {
1123         for(; c && (c->isfloating || !isvisible(c)); c = c->next);
1124         return c;
1125 }
1126
1127 void
1128 propertynotify(XEvent *e) {
1129         Client *c;
1130         Window trans;
1131         XPropertyEvent *ev = &e->xproperty;
1132
1133         if(ev->state == PropertyDelete)
1134                 return; /* ignore */
1135         if((c = getclient(ev->window))) {
1136                 switch (ev->atom) {
1137                         default: break;
1138                         case XA_WM_TRANSIENT_FOR:
1139                                 XGetTransientForHint(dpy, c->win, &trans);
1140                                 if(!c->isfloating && (c->isfloating = (NULL != getclient(trans))))
1141                                         arrange();
1142                                 break;
1143                         case XA_WM_NORMAL_HINTS:
1144                                 updatesizehints(c);
1145                                 break;
1146                 }
1147                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1148                         updatetitle(c);
1149                         if(c == sel)
1150                                 drawbar();
1151                 }
1152         }
1153 }
1154
1155 void
1156 quit(const char *arg) {
1157         readin = running = False;
1158 }
1159
1160 void
1161 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1162         XWindowChanges wc;
1163
1164         if(sizehints) {
1165                 /* set minimum possible */
1166                 if (w < 1)
1167                         w = 1;
1168                 if (h < 1)
1169                         h = 1;
1170
1171                 /* temporarily remove base dimensions */
1172                 w -= c->basew;
1173                 h -= c->baseh;
1174
1175                 /* adjust for aspect limits */
1176                 if (c->minay > 0 && c->maxay > 0 && c->minax > 0 && c->maxax > 0) {
1177                         if (w * c->maxay > h * c->maxax)
1178                                 w = h * c->maxax / c->maxay;
1179                         else if (w * c->minay < h * c->minax)
1180                                 h = w * c->minay / c->minax;
1181                 }
1182
1183                 /* adjust for increment value */
1184                 if(c->incw)
1185                         w -= w % c->incw;
1186                 if(c->inch)
1187                         h -= h % c->inch;
1188
1189                 /* restore base dimensions */
1190                 w += c->basew;
1191                 h += c->baseh;
1192
1193                 if(c->minw > 0 && w < c->minw)
1194                         w = c->minw;
1195                 if(c->minh > 0 && h < c->minh)
1196                         h = c->minh;
1197                 if(c->maxw > 0 && w > c->maxw)
1198                         w = c->maxw;
1199                 if(c->maxh > 0 && h > c->maxh)
1200                         h = c->maxh;
1201         }
1202         if(w <= 0 || h <= 0)
1203                 return;
1204         /* offscreen appearance fixes */
1205         if(x > sw)
1206                 x = sw - w - 2 * c->border;
1207         if(y > sh)
1208                 y = sh - h - 2 * c->border;
1209         if(x + w + 2 * c->border < sx)
1210                 x = sx;
1211         if(y + h + 2 * c->border < sy)
1212                 y = sy;
1213         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1214                 c->x = wc.x = x;
1215                 c->y = wc.y = y;
1216                 c->w = wc.width = w;
1217                 c->h = wc.height = h;
1218                 wc.border_width = c->border;
1219                 XConfigureWindow(dpy, c->win, CWX | CWY | CWWidth | CWHeight | CWBorderWidth, &wc);
1220                 configure(c);
1221                 XSync(dpy, False);
1222         }
1223 }
1224
1225 void
1226 resizemouse(Client *c) {
1227         int ocx, ocy;
1228         int nw, nh;
1229         XEvent ev;
1230
1231         ocx = c->x;
1232         ocy = c->y;
1233         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1234                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1235                 return;
1236         c->ismax = False;
1237         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->border - 1, c->h + c->border - 1);
1238         for(;;) {
1239                 XMaskEvent(dpy, MOUSEMASK | ExposureMask | SubstructureRedirectMask , &ev);
1240                 switch(ev.type) {
1241                 case ButtonRelease:
1242                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1243                                         c->w + c->border - 1, c->h + c->border - 1);
1244                         XUngrabPointer(dpy, CurrentTime);
1245                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1246                         return;
1247                 case ConfigureRequest:
1248                 case Expose:
1249                 case MapRequest:
1250                         handler[ev.type](&ev);
1251                         break;
1252                 case MotionNotify:
1253                         XSync(dpy, False);
1254                         if((nw = ev.xmotion.x - ocx - 2 * c->border + 1) <= 0)
1255                                 nw = 1;
1256                         if((nh = ev.xmotion.y - ocy - 2 * c->border + 1) <= 0)
1257                                 nh = 1;
1258                         resize(c, c->x, c->y, nw, nh, True);
1259                         break;
1260                 }
1261         }
1262 }
1263
1264 void
1265 restack(void) {
1266         Client *c;
1267         XEvent ev;
1268         XWindowChanges wc;
1269
1270         drawbar();
1271         if(!sel)
1272                 return;
1273         if(sel->isfloating || isarrange(floating))
1274                 XRaiseWindow(dpy, sel->win);
1275         if(!isarrange(floating)) {
1276                 wc.stack_mode = Below;
1277                 wc.sibling = barwin;
1278                 if(!sel->isfloating) {
1279                         XConfigureWindow(dpy, sel->win, CWSibling | CWStackMode, &wc);
1280                         wc.sibling = sel->win;
1281                 }
1282                 for(c = nexttiled(clients); c; c = nexttiled(c->next)) {
1283                         if(c == sel)
1284                                 continue;
1285                         XConfigureWindow(dpy, c->win, CWSibling | CWStackMode, &wc);
1286                         wc.sibling = c->win;
1287                 }
1288         }
1289         XSync(dpy, False);
1290         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1291 }
1292
1293 void
1294 run(void) {
1295         char *p;
1296         int r, xfd;
1297         fd_set rd;
1298         XEvent ev;
1299
1300         /* main event loop, also reads status text from stdin */
1301         XSync(dpy, False);
1302         xfd = ConnectionNumber(dpy);
1303         readin = True;
1304         while(running) {
1305                 FD_ZERO(&rd);
1306                 if(readin)
1307                         FD_SET(STDIN_FILENO, &rd);
1308                 FD_SET(xfd, &rd);
1309                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1310                         if(errno == EINTR)
1311                                 continue;
1312                         eprint("select failed\n");
1313                 }
1314                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1315                         switch(r = read(STDIN_FILENO, stext, sizeof stext - 1)) {
1316                         case -1:
1317                                 strncpy(stext, strerror(errno), sizeof stext - 1);
1318                                 stext[sizeof stext - 1] = '\0';
1319                                 readin = False;
1320                                 break;
1321                         case 0:
1322                                 strncpy(stext, "EOF", 4);
1323                                 readin = False;
1324                                 break;
1325                         default:
1326                                 for(stext[r] = '\0', p = stext + strlen(stext) - 1; p >= stext && *p == '\n'; *p-- = '\0');
1327                                 for(; p >= stext && *p != '\n'; --p);
1328                                 if(p > stext)
1329                                         strncpy(stext, p + 1, sizeof stext);
1330                         }
1331                         drawbar();
1332                 }
1333                 while(XPending(dpy)) {
1334                         XNextEvent(dpy, &ev);
1335                         if(handler[ev.type])
1336                                 (handler[ev.type])(&ev); /* call handler */
1337                 }
1338         }
1339 }
1340
1341 void
1342 scan(void) {
1343         unsigned int i, num;
1344         Window *wins, d1, d2;
1345         XWindowAttributes wa;
1346
1347         wins = NULL;
1348         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1349                 for(i = 0; i < num; i++) {
1350                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1351                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1352                                 continue;
1353                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1354                                 manage(wins[i], &wa);
1355                 }
1356                 for(i = 0; i < num; i++) { /* now the transients */
1357                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1358                                 continue;
1359                         if(XGetTransientForHint(dpy, wins[i], &d1)
1360                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1361                                 manage(wins[i], &wa);
1362                 }
1363         }
1364         if(wins)
1365                 XFree(wins);
1366 }
1367
1368 void
1369 setclientstate(Client *c, long state) {
1370         long data[] = {state, None};
1371
1372         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1373                         PropModeReplace, (unsigned char *)data, 2);
1374 }
1375
1376 void
1377 setlayout(const char *arg) {
1378         unsigned int i;
1379
1380         if(!arg) {
1381                 if(++ltidx == nlayouts)
1382                         ltidx = 0;;
1383         }
1384         else {
1385                 for(i = 0; i < nlayouts; i++)
1386                         if(!strcmp(arg, layouts[i].symbol))
1387                                 break;
1388                 if(i == nlayouts)
1389                         return;
1390                 ltidx = i;
1391         }
1392         if(sel)
1393                 arrange();
1394         else
1395                 drawbar();
1396 }
1397
1398 void
1399 setmwfact(const char *arg) {
1400         double delta;
1401
1402         if(!(ISTILE))
1403                 return;
1404         /* arg handling, manipulate mwfact */
1405         if(arg == NULL)
1406                 mwfact = MWFACT;
1407         else if(1 == sscanf(arg, "%lf", &delta)) {
1408                 if(arg[0] == '+' || arg[0] == '-')
1409                         mwfact += delta;
1410                 else
1411                         mwfact = delta;
1412                 if(mwfact < 0.1)
1413                         mwfact = 0.1;
1414                 else if(mwfact > 0.9)
1415                         mwfact = 0.9;
1416         }
1417         arrange();
1418 }
1419
1420 void
1421 setup(void) {
1422         int d;
1423         unsigned int i, j, mask;
1424         Window w;
1425         XModifierKeymap *modmap;
1426         XSetWindowAttributes wa;
1427
1428         /* init atoms */
1429         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1430         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1431         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1432         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1433         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1434         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1435         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1436                         PropModeReplace, (unsigned char *) netatom, NetLast);
1437
1438         /* init cursors */
1439         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1440         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1441         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1442
1443         /* init geometry */
1444         sx = sy = 0;
1445         sw = DisplayWidth(dpy, screen);
1446         sh = DisplayHeight(dpy, screen);
1447
1448         /* init modifier map */
1449         modmap = XGetModifierMapping(dpy);
1450         for(i = 0; i < 8; i++)
1451                 for(j = 0; j < modmap->max_keypermod; j++) {
1452                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1453                         == XKeysymToKeycode(dpy, XK_Num_Lock))
1454                                 numlockmask = (1 << i);
1455                 }
1456         XFreeModifiermap(modmap);
1457
1458         /* select for events */
1459         wa.event_mask = SubstructureRedirectMask | SubstructureNotifyMask
1460                 | EnterWindowMask | LeaveWindowMask | StructureNotifyMask;
1461         wa.cursor = cursor[CurNormal];
1462         XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
1463         XSelectInput(dpy, root, wa.event_mask);
1464
1465         /* grab keys */
1466         keypress(NULL);
1467
1468         /* init tags */
1469         compileregs();
1470
1471         /* init appearance */
1472         dc.norm[ColBorder] = getcolor(NORMBORDERCOLOR);
1473         dc.norm[ColBG] = getcolor(NORMBGCOLOR);
1474         dc.norm[ColFG] = getcolor(NORMFGCOLOR);
1475         dc.sel[ColBorder] = getcolor(SELBORDERCOLOR);
1476         dc.sel[ColBG] = getcolor(SELBGCOLOR);
1477         dc.sel[ColFG] = getcolor(SELFGCOLOR);
1478         initfont(FONT);
1479         dc.h = bh = dc.font.height + 2;
1480
1481         /* init layouts */
1482         mwfact = MWFACT;
1483         nlayouts = sizeof layouts / sizeof layouts[0];
1484         for(blw = i = 0; i < nlayouts; i++) {
1485                 j = textw(layouts[i].symbol);
1486                 if(j > blw)
1487                         blw = j;
1488         }
1489
1490         /* init bar */
1491         bpos = BARPOS;
1492         wa.override_redirect = 1;
1493         wa.background_pixmap = ParentRelative;
1494         wa.event_mask = ButtonPressMask | ExposureMask;
1495         barwin = XCreateWindow(dpy, root, sx, sy, sw, bh, 0,
1496                         DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
1497                         CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
1498         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1499         updatebarpos();
1500         XMapRaised(dpy, barwin);
1501         strcpy(stext, "dwm-"VERSION);
1502         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
1503         dc.gc = XCreateGC(dpy, root, 0, 0);
1504         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1505         if(!dc.font.set)
1506                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1507
1508         /* multihead support */
1509         selscreen = XQueryPointer(dpy, root, &w, &w, &d, &d, &d, &d, &mask);
1510 }
1511
1512 void
1513 spawn(const char *arg) {
1514         static char *shell = NULL;
1515
1516         if(!shell && !(shell = getenv("SHELL")))
1517                 shell = "/bin/sh";
1518         if(!arg)
1519                 return;
1520         /* The double-fork construct avoids zombie processes and keeps the code
1521          * clean from stupid signal handlers. */
1522         if(fork() == 0) {
1523                 if(fork() == 0) {
1524                         if(dpy)
1525                                 close(ConnectionNumber(dpy));
1526                         setsid();
1527                         execl(shell, shell, "-c", arg, (char *)NULL);
1528                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
1529                         perror(" failed");
1530                 }
1531                 exit(0);
1532         }
1533         wait(0);
1534 }
1535
1536 void
1537 tag(const char *arg) {
1538         unsigned int i;
1539
1540         if(!sel)
1541                 return;
1542         for(i = 0; i < NTAGS; i++)
1543                 sel->tags[i] = (NULL == arg);
1544         sel->tags[idxoftag(arg)] = True;
1545         arrange();
1546 }
1547
1548 unsigned int
1549 textnw(const char *text, unsigned int len) {
1550         XRectangle r;
1551
1552         if(dc.font.set) {
1553                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1554                 return r.width;
1555         }
1556         return XTextWidth(dc.font.xfont, text, len);
1557 }
1558
1559 unsigned int
1560 textw(const char *text) {
1561         return textnw(text, strlen(text)) + dc.font.height;
1562 }
1563
1564 void
1565 tile(void) {
1566         unsigned int i, n, nx, ny, nw, nh, mw, th;
1567         Client *c, *mc;
1568
1569         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next))
1570                 n++;
1571
1572         /* window geoms */
1573         mw = (n == 1) ? waw : mwfact * waw;
1574         th = (n > 1) ? wah / (n - 1) : 0;
1575         if(n > 1 && th < bh)
1576                 th = wah;
1577
1578         nx = wax;
1579         ny = way;
1580         nw = 0; /* gcc stupidity requires this */
1581         for(i = 0, c = mc = nexttiled(clients); c; c = nexttiled(c->next), i++) {
1582                 c->ismax = False;
1583                 if(i == 0) { /* master */
1584                         nw = mw - 2 * c->border;
1585                         nh = wah - 2 * c->border;
1586                 }
1587                 else {  /* tile window */
1588                         if(i == 1) {
1589                                 ny = way;
1590                                 nx += mc->w + 2 * mc->border;
1591                                 nw = waw - nx - 2 * c->border;
1592                         }
1593                         if(i + 1 == n) /* remainder */
1594                                 nh = (way + wah) - ny - 2 * c->border;
1595                         else
1596                                 nh = th - 2 * c->border;
1597                 }
1598                 resize(c, nx, ny, nw, nh, True);
1599                 if((c->h < bh) || (c->h > nh) || (c->w < bh) || (c->w > nw))
1600                         /* client doesn't accept size constraints */
1601                         resize(c, nx, ny, nw, nh, False);
1602                 if(n > 1 && th != wah)
1603                         ny = c->y + c->h + 2 * c->border;
1604         }
1605 }
1606
1607 void
1608 togglebar(const char *arg) {
1609         if(bpos == BarOff)
1610                 bpos = (BARPOS == BarOff) ? BarTop : BARPOS;
1611         else
1612                 bpos = BarOff;
1613         updatebarpos();
1614         arrange();
1615 }
1616
1617 void
1618 togglefloating(const char *arg) {
1619         if(!sel)
1620                 return;
1621         sel->isfloating = !sel->isfloating;
1622         if(sel->isfloating)
1623                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1624         arrange();
1625 }
1626
1627 void
1628 togglemax(const char *arg) {
1629         XEvent ev;
1630
1631         if(!sel || sel->isfixed)
1632                 return;
1633         if((sel->ismax = !sel->ismax)) {
1634                 if(isarrange(floating) || sel->isfloating)
1635                         sel->wasfloating = True;
1636                 else {
1637                         togglefloating(NULL);
1638                         sel->wasfloating = False;
1639                 }
1640                 sel->rx = sel->x;
1641                 sel->ry = sel->y;
1642                 sel->rw = sel->w;
1643                 sel->rh = sel->h;
1644                 resize(sel, wax, way, waw - 2 * sel->border, wah - 2 * sel->border, True);
1645         }
1646         else {
1647                 resize(sel, sel->rx, sel->ry, sel->rw, sel->rh, True);
1648                 if(!sel->wasfloating)
1649                         togglefloating(NULL);
1650         }
1651         drawbar();
1652         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1653 }
1654
1655 void
1656 toggletag(const char *arg) {
1657         unsigned int i, j;
1658
1659         if(!sel)
1660                 return;
1661         i = idxoftag(arg);
1662         sel->tags[i] = !sel->tags[i];
1663         for(j = 0; j < NTAGS && !sel->tags[j]; j++);
1664         if(j == NTAGS)
1665                 sel->tags[i] = True; /* at least one tag must be enabled */
1666         arrange();
1667 }
1668
1669 void
1670 toggleview(const char *arg) {
1671         unsigned int i, j;
1672
1673         i = idxoftag(arg);
1674         seltags[i] = !seltags[i];
1675         for(j = 0; j < NTAGS && !seltags[j]; j++);
1676         if(j == NTAGS)
1677                 seltags[i] = True; /* at least one tag must be viewed */
1678         arrange();
1679 }
1680
1681 void
1682 unban(Client *c) {
1683         if(!c->isbanned)
1684                 return;
1685         XMoveWindow(dpy, c->win, c->x, c->y);
1686         c->isbanned = False;
1687 }
1688
1689 void
1690 unmanage(Client *c) {
1691         XWindowChanges wc;
1692
1693         wc.border_width = c->oldborder;
1694         /* The server grab construct avoids race conditions. */
1695         XGrabServer(dpy);
1696         XSetErrorHandler(xerrordummy);
1697         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1698         detach(c);
1699         detachstack(c);
1700         if(sel == c)
1701                 focus(NULL);
1702         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1703         setclientstate(c, WithdrawnState);
1704         free(c->tags);
1705         free(c);
1706         XSync(dpy, False);
1707         XSetErrorHandler(xerror);
1708         XUngrabServer(dpy);
1709         arrange();
1710 }
1711
1712 void
1713 unmapnotify(XEvent *e) {
1714         Client *c;
1715         XUnmapEvent *ev = &e->xunmap;
1716
1717         if((c = getclient(ev->window)))
1718                 unmanage(c);
1719 }
1720
1721 void
1722 updatebarpos(void) {
1723         XEvent ev;
1724
1725         wax = sx;
1726         way = sy;
1727         wah = sh;
1728         waw = sw;
1729         switch(bpos) {
1730         default:
1731                 wah -= bh;
1732                 way += bh;
1733                 XMoveWindow(dpy, barwin, sx, sy);
1734                 break;
1735         case BarBot:
1736                 wah -= bh;
1737                 XMoveWindow(dpy, barwin, sx, sy + wah);
1738                 break;
1739         case BarOff:
1740                 XMoveWindow(dpy, barwin, sx, sy - bh);
1741                 break;
1742         }
1743         XSync(dpy, False);
1744         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1745 }
1746
1747 void
1748 updatesizehints(Client *c) {
1749         long msize;
1750         XSizeHints size;
1751
1752         if(!XGetWMNormalHints(dpy, c->win, &size, &msize) || !size.flags)
1753                 size.flags = PSize;
1754         c->flags = size.flags;
1755         if(c->flags & PBaseSize) {
1756                 c->basew = size.base_width;
1757                 c->baseh = size.base_height;
1758         }
1759         else if(c->flags & PMinSize) {
1760                 c->basew = size.min_width;
1761                 c->baseh = size.min_height;
1762         }
1763         else
1764                 c->basew = c->baseh = 0;
1765         if(c->flags & PResizeInc) {
1766                 c->incw = size.width_inc;
1767                 c->inch = size.height_inc;
1768         }
1769         else
1770                 c->incw = c->inch = 0;
1771         if(c->flags & PMaxSize) {
1772                 c->maxw = size.max_width;
1773                 c->maxh = size.max_height;
1774         }
1775         else
1776                 c->maxw = c->maxh = 0;
1777         if(c->flags & PMinSize) {
1778                 c->minw = size.min_width;
1779                 c->minh = size.min_height;
1780         }
1781         else if(c->flags & PBaseSize) {
1782                 c->minw = size.base_width;
1783                 c->minh = size.base_height;
1784         }
1785         else
1786                 c->minw = c->minh = 0;
1787         if(c->flags & PAspect) {
1788                 c->minax = size.min_aspect.x;
1789                 c->maxax = size.max_aspect.x;
1790                 c->minay = size.min_aspect.y;
1791                 c->maxay = size.max_aspect.y;
1792         }
1793         else
1794                 c->minax = c->maxax = c->minay = c->maxay = 0;
1795         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1796                         && c->maxw == c->minw && c->maxh == c->minh);
1797 }
1798
1799 void
1800 updatetitle(Client *c) {
1801         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1802                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1803 }
1804
1805 /* There's no way to check accesses to destroyed windows, thus those cases are
1806  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1807  * default error handler, which may call exit.  */
1808 int
1809 xerror(Display *dpy, XErrorEvent *ee) {
1810         if(ee->error_code == BadWindow
1811         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1812         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1813         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1814         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1815         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1816         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1817         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1818                 return 0;
1819         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1820                 ee->request_code, ee->error_code);
1821         return xerrorxlib(dpy, ee); /* may call exit */
1822 }
1823
1824 int
1825 xerrordummy(Display *dsply, XErrorEvent *ee) {
1826         return 0;
1827 }
1828
1829 /* Startup Error handler to check if another window manager
1830  * is already running. */
1831 int
1832 xerrorstart(Display *dsply, XErrorEvent *ee) {
1833         otherwm = True;
1834         return -1;
1835 }
1836
1837 void
1838 view(const char *arg) {
1839         unsigned int i;
1840
1841         memcpy(prevtags, seltags, sizeof seltags);
1842         for(i = 0; i < NTAGS; i++)
1843                 seltags[i] = arg == NULL;
1844         seltags[idxoftag(arg)] = True;
1845         arrange();
1846 }
1847
1848 void
1849 viewprevtag(const char *arg) {
1850         static Bool tmptags[sizeof tags / sizeof tags[0]];
1851
1852         memcpy(tmptags, seltags, sizeof seltags);
1853         memcpy(seltags, prevtags, sizeof seltags);
1854         memcpy(prevtags, tmptags, sizeof seltags);
1855         arrange();
1856 }
1857
1858 void
1859 zoom(const char *arg) {
1860         Client *c;
1861
1862         if(!sel || !(ISTILE) || sel->isfloating)
1863                 return;
1864         if((c = sel) == nexttiled(clients))
1865                 if(!(c = nexttiled(c->next)))
1866                         return;
1867         detach(c);
1868         attach(c);
1869         focus(c);
1870         arrange();
1871 }
1872
1873 int
1874 main(int argc, char *argv[]) {
1875         if(argc == 2 && !strcmp("-v", argv[1]))
1876                 eprint("dwm-"VERSION", © 2006-2007 A. R. Garbe, S. van Dijk, J. Salmi, P. Hruby, S. Nagy\n");
1877         else if(argc != 1)
1878                 eprint("usage: dwm [-v]\n");
1879
1880         setlocale(LC_CTYPE, "");
1881         if(!(dpy = XOpenDisplay(0)))
1882                 eprint("dwm: cannot open display\n");
1883         screen = DefaultScreen(dpy);
1884         root = RootWindow(dpy, screen);
1885
1886         checkotherwm();
1887         setup();
1888         drawbar();
1889         scan();
1890         run();
1891         cleanup();
1892
1893         XCloseDisplay(dpy);
1894         return 0;
1895 }