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 a bit array to indicate the tags of a
  20  * client.
  21  *
  22  * Keys and tagging rules are organized as arrays and defined in config.h.
  23  *
  24  * To understand everything else, start reading main().
  25  */
  26 #include <errno.h>
  27 #include <locale.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <sys/select.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <X11/cursorfont.h>
  37 #include <X11/keysym.h>
  38 #include <X11/Xatom.h>
  39 #include <X11/Xlib.h>
  40 #include <X11/Xproto.h>
  41 #include <X11/Xutil.h>
  42 #ifdef XINERAMA
  43 #include <X11/extensions/Xinerama.h>
  44 #endif
  45
  46 /* macros */
  47 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  48 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask))
  49 #define INRECT(X,Y,RX,RY,RW,RH) ((X) >= (RX) && (X) < (RX) + (RW) && (Y) >= (RY) && (Y) < (RY) + (RH))
  50 #define ISVISIBLE(x)            (x->tags & tagset[seltags])
  51 #define LENGTH(x)               (sizeof x / sizeof x[0])
  52 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
  53 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
  54 #define MAXTAGLEN               16
  55 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  56 #define TAGMASK                 ((int)((1LL << LENGTH(tags)) - 1))
  57 #define TEXTW(x)                (textnw(x, strlen(x)) + dc.font.height)
  58
  59 /* enums */
  60 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  61 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  62 enum { NetSupported, NetWMName, NetLast };              /* EWMH atoms */
  63 enum { WMProtocols, WMDelete, WMName, WMState, WMLast };/* default atoms */
  64 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  65        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  66
  67 typedef union {
  68         int i;
  69         unsigned int ui;
  70         float f;
  71         void *v;
  72 } Arg;
  73
  74 typedef struct {
  75         unsigned int click;
  76         unsigned int mask;
  77         unsigned int button;
  78         void (*func)(const Arg *arg);
  79         const Arg arg;
  80 } Button;
  81
  82 typedef struct Client Client;
  83 struct Client {
  84         char name[256];
  85         float mina, maxa;
  86         int x, y, w, h;
  87         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  88         int bw, oldbw;
  89         unsigned int tags;
  90         Bool isfixed, isfloating, isurgent;
  91         Client *next;
  92         Client *snext;
  93         Window win;
  94 };
  95
  96 typedef struct {
  97         int x, y, w, h;
  98         unsigned long norm[ColLast];
  99         unsigned long sel[ColLast];
 100         Drawable drawable;
 101         GC gc;
 102         struct {
 103                 int ascent;
 104                 int descent;
 105                 int height;
 106                 XFontSet set;
 107                 XFontStruct *xfont;
 108         } font;
 109 } DC; /* draw context */
 110
 111 typedef struct {
 112         unsigned int mod;
 113         KeySym keysym;
 114         void (*func)(const Arg *);
 115         const Arg arg;
 116 } Key;
 117
 118 typedef struct {
 119         const char *symbol;
 120         void (*arrange)(void);
 121 } Layout;
 122
 123 typedef struct {
 124         const char *class;
 125         const char *instance;
 126         const char *title;
 127         unsigned int tags;
 128         Bool isfloating;
 129 } Rule;
 130
 131 /* function declarations */
 132 static void applyrules(Client *c);
 133 static void arrange(void);
 134 static void attach(Client *c);
 135 static void attachstack(Client *c);
 136 static void buttonpress(XEvent *e);
 137 static void checkotherwm(void);
 138 static void cleanup(void);
 139 static void clearurgent(void);
 140 static void configure(Client *c);
 141 static void configurenotify(XEvent *e);
 142 static void configurerequest(XEvent *e);
 143 static void destroynotify(XEvent *e);
 144 static void detach(Client *c);
 145 static void detachstack(Client *c);
 146 static void die(const char *errstr, ...);
 147 static void drawbar(void);
 148 static void drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]);
 149 static void drawtext(const char *text, unsigned long col[ColLast], Bool invert);
 150 static void enternotify(XEvent *e);
 151 static void expose(XEvent *e);
 152 static void focus(Client *c);
 153 static void focusin(XEvent *e);
 154 static void focusstack(const Arg *arg);
 155 static Client *getclient(Window w);
 156 static unsigned long getcolor(const char *colstr);
 157 static long getstate(Window w);
 158 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 159 static void grabbuttons(Client *c, Bool focused);
 160 static void grabkeys(void);
 161 static void initfont(const char *fontstr);
 162 static Bool isprotodel(Client *c);
 163 static void keypress(XEvent *e);
 164 static void killclient(const Arg *arg);
 165 static void manage(Window w, XWindowAttributes *wa);
 166 static void mappingnotify(XEvent *e);
 167 static void maprequest(XEvent *e);
 168 static void monocle(void);
 169 static void movemouse(const Arg *arg);
 170 static Client *nexttiled(Client *c);
 171 static void propertynotify(XEvent *e);
 172 static void quit(const Arg *arg);
 173 static void resize(Client *c, int x, int y, int w, int h, Bool sizehints);
 174 static void resizemouse(const Arg *arg);
 175 static void restack(void);
 176 static void run(void);
 177 static void scan(void);
 178 static void setclientstate(Client *c, long state);
 179 static void setlayout(const Arg *arg);
 180 static void setmfact(const Arg *arg);
 181 static void setup(void);
 182 static void spawn(const Arg *arg);
 183 static void tag(const Arg *arg);
 184 static int textnw(const char *text, unsigned int len);
 185 static void tile(void);
 186 static void togglebar(const Arg *arg);
 187 static void togglefloating(const Arg *arg);
 188 static void toggletag(const Arg *arg);
 189 static void toggleview(const Arg *arg);
 190 static void unmanage(Client *c);
 191 static void unmapnotify(XEvent *e);
 192 static void updatebar(void);
 193 static void updategeom(void);
 194 static void updatesizehints(Client *c);
 195 static void updatetitle(Client *c);
 196 static void updatewmhints(Client *c);
 197 static void view(const Arg *arg);
 198 static int xerror(Display *dpy, XErrorEvent *ee);
 199 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 200 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 201 static void zoom(const Arg *arg);
 202
 203 /* variables */
 204 static char stext[256];
 205 static int screen, sx, sy, sw, sh;
 206 static int by, bh, blw, wx, wy, ww, wh;
 207 static unsigned int seltags = 0, sellt = 0;
 208 static int (*xerrorxlib)(Display *, XErrorEvent *);
 209 static unsigned int numlockmask = 0;
 210 static void (*handler[LASTEvent]) (XEvent *) = {
 211         [ButtonPress] = buttonpress,
 212         [ConfigureRequest] = configurerequest,
 213         [ConfigureNotify] = configurenotify,
 214         [DestroyNotify] = destroynotify,
 215         [EnterNotify] = enternotify,
 216         [Expose] = expose,
 217         [FocusIn] = focusin,
 218         [KeyPress] = keypress,
 219         [MappingNotify] = mappingnotify,
 220         [MapRequest] = maprequest,
 221         [PropertyNotify] = propertynotify,
 222         [UnmapNotify] = unmapnotify
 223 };
 224 static Atom wmatom[WMLast], netatom[NetLast];
 225 static Bool otherwm;
 226 static Bool running = True;
 227 static unsigned int tagset[] = {1, 1}; /* after start, first tag is selected */
 228 static Client *clients = NULL;
 229 static Client *sel = NULL;
 230 static Client *stack = NULL;
 231 static Cursor cursor[CurLast];
 232 static Display *dpy;
 233 static DC dc = {0};
 234 static Layout *lt[] = { NULL, NULL };
 235 static Window root, barwin;
 236 /* configuration, allows nested code to access above variables */
 237 #include "config.h"
 238
 239 /* compile-time check if all tags fit into an unsigned int bit array. */
 240 struct NumTags { char limitexceeded[sizeof(unsigned int) * 8 < LENGTH(tags) ? -1 : 1]; };
 241
 242 /* function implementations */
 243 void
 244 applyrules(Client *c) {
 245         unsigned int i;
 246         Rule *r;
 247         XClassHint ch = { 0 };
 248
 249         /* rule matching */
 250         XGetClassHint(dpy, c->win, &ch);
 251         for(i = 0; i < LENGTH(rules); i++) {
 252                 r = &rules[i];
 253                 if((!r->title || strstr(c->name, r->title))
 254                 && (!r->class || (ch.res_class && strstr(ch.res_class, r->class)))
 255                 && (!r->instance || (ch.res_name && strstr(ch.res_name, r->instance)))) {
 256                         c->isfloating = r->isfloating;
 257                         c->tags |= r->tags & TAGMASK;
 258                 }
 259         }
 260         if(ch.res_class)
 261                 XFree(ch.res_class);
 262         if(ch.res_name)
 263                 XFree(ch.res_name);
 264         if(!c->tags)
 265                 c->tags = tagset[seltags];
 266 }
 267
 268 void
 269 arrange(void) {
 270         Client *c;
 271
 272         for(c = clients; c; c = c->next)
 273                 if(ISVISIBLE(c)) {
 274                         XMoveWindow(dpy, c->win, c->x, c->y);
 275                         if(!lt[sellt]->arrange || c->isfloating)
 276                                 resize(c, c->x, c->y, c->w, c->h, True);
 277                 }
 278                 else {
 279                         XMoveWindow(dpy, c->win, c->x + 2 * sw, c->y);
 280                 }
 281
 282         focus(NULL);
 283         if(lt[sellt]->arrange)
 284                 lt[sellt]->arrange();
 285         restack();
 286 }
 287
 288 void
 289 attach(Client *c) {
 290         c->next = clients;
 291         clients = c;
 292 }
 293
 294 void
 295 attachstack(Client *c) {
 296         c->snext = stack;
 297         stack = c;
 298 }
 299
 300 void
 301 buttonpress(XEvent *e) {
 302         unsigned int i, x, click;
 303         Arg arg = {0};
 304         Client *c;
 305         XButtonPressedEvent *ev = &e->xbutton;
 306
 307         click = ClkRootWin;
 308         if(ev->window == barwin) {
 309                 i = x = 0;
 310                 do x += TEXTW(tags[i]); while(ev->x >= x && ++i < LENGTH(tags));
 311                 if(i < LENGTH(tags)) {
 312                         click = ClkTagBar;
 313                         arg.ui = 1 << i;
 314                 }
 315                 else if(ev->x < x + blw)
 316                         click = ClkLtSymbol;
 317                 else if(ev->x > wx + ww - TEXTW(stext))
 318                         click = ClkStatusText;
 319                 else
 320                         click = ClkWinTitle;
 321         }
 322         else if((c = getclient(ev->window))) {
 323                 focus(c);
 324                 click = ClkClientWin;
 325         }
 326
 327         for(i = 0; i < LENGTH(buttons); i++)
 328                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 329                    && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 330                         buttons[i].func(click == ClkTagBar ? &arg : &buttons[i].arg);
 331 }
 332
 333 void
 334 checkotherwm(void) {
 335         otherwm = False;
 336         XSetErrorHandler(xerrorstart);
 337
 338         /* this causes an error if some other window manager is running */
 339         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 340         XSync(dpy, False);
 341         if(otherwm)
 342                 die("dwm: another window manager is already running\n");
 343         XSetErrorHandler(NULL);
 344         xerrorxlib = XSetErrorHandler(xerror);
 345         XSync(dpy, False);
 346 }
 347
 348 void
 349 cleanup(void) {
 350         Arg a = {.ui = ~0};
 351         Layout foo = { "", NULL };
 352
 353         close(STDIN_FILENO);
 354         view(&a);
 355         lt[sellt] = &foo;
 356         while(stack)
 357                 unmanage(stack);
 358         if(dc.font.set)
 359                 XFreeFontSet(dpy, dc.font.set);
 360         else
 361                 XFreeFont(dpy, dc.font.xfont);
 362         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 363         XFreePixmap(dpy, dc.drawable);
 364         XFreeGC(dpy, dc.gc);
 365         XFreeCursor(dpy, cursor[CurNormal]);
 366         XFreeCursor(dpy, cursor[CurResize]);
 367         XFreeCursor(dpy, cursor[CurMove]);
 368         XDestroyWindow(dpy, barwin);
 369         XSync(dpy, False);
 370         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 371 }
 372
 373 void
 374 clearurgent(void) {
 375         XWMHints *wmh;
 376         Client *c;
 377
 378         for(c = clients; c; c = c->next)
 379                 if(ISVISIBLE(c) && c->isurgent) {
 380                         c->isurgent = False;
 381                         if (!(wmh = XGetWMHints(dpy, c->win)))
 382                                 continue;
 383
 384                         wmh->flags &= ~XUrgencyHint;
 385                         XSetWMHints(dpy, c->win, wmh);
 386                         XFree(wmh);
 387                 }
 388 }
 389
 390 void
 391 configure(Client *c) {
 392         XConfigureEvent ce;
 393
 394         ce.type = ConfigureNotify;
 395         ce.display = dpy;
 396         ce.event = c->win;
 397         ce.window = c->win;
 398         ce.x = c->x;
 399         ce.y = c->y;
 400         ce.width = c->w;
 401         ce.height = c->h;
 402         ce.border_width = c->bw;
 403         ce.above = None;
 404         ce.override_redirect = False;
 405         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 406 }
 407
 408 void
 409 configurenotify(XEvent *e) {
 410         XConfigureEvent *ev = &e->xconfigure;
 411
 412         if(ev->window == root && (ev->width != sw || ev->height != sh)) {
 413                 sw = ev->width;
 414                 sh = ev->height;
 415                 updategeom();
 416                 updatebar();
 417                 arrange();
 418         }
 419 }
 420
 421 void
 422 configurerequest(XEvent *e) {
 423         Client *c;
 424         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 425         XWindowChanges wc;
 426
 427         if((c = getclient(ev->window))) {
 428                 if(ev->value_mask & CWBorderWidth)
 429                         c->bw = ev->border_width;
 430                 else if(c->isfloating || !lt[sellt]->arrange) {
 431                         if(ev->value_mask & CWX)
 432                                 c->x = sx + ev->x;
 433                         if(ev->value_mask & CWY)
 434                                 c->y = sy + ev->y;
 435                         if(ev->value_mask & CWWidth)
 436                                 c->w = ev->width;
 437                         if(ev->value_mask & CWHeight)
 438                                 c->h = ev->height;
 439                         if((c->x - sx + c->w) > sw && c->isfloating)
 440                                 c->x = sx + (sw / 2 - c->w / 2); /* center in x direction */
 441                         if((c->y - sy + c->h) > sh && c->isfloating)
 442                                 c->y = sy + (sh / 2 - c->h / 2); /* center in y direction */
 443                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 444                                 configure(c);
 445                         if(ISVISIBLE(c))
 446                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 447                 }
 448                 else
 449                         configure(c);
 450         }
 451         else {
 452                 wc.x = ev->x;
 453                 wc.y = ev->y;
 454                 wc.width = ev->width;
 455                 wc.height = ev->height;
 456                 wc.border_width = ev->border_width;
 457                 wc.sibling = ev->above;
 458                 wc.stack_mode = ev->detail;
 459                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 460         }
 461         XSync(dpy, False);
 462 }
 463
 464 void
 465 destroynotify(XEvent *e) {
 466         Client *c;
 467         XDestroyWindowEvent *ev = &e->xdestroywindow;
 468
 469         if((c = getclient(ev->window)))
 470                 unmanage(c);
 471 }
 472
 473 void
 474 detach(Client *c) {
 475         Client **tc;
 476
 477         for(tc = &clients; *tc && *tc != c; tc = &(*tc)->next);
 478         *tc = c->next;
 479 }
 480
 481 void
 482 detachstack(Client *c) {
 483         Client **tc;
 484
 485         for(tc = &stack; *tc && *tc != c; tc = &(*tc)->snext);
 486         *tc = c->snext;
 487 }
 488
 489 void
 490 die(const char *errstr, ...) {
 491         va_list ap;
 492
 493         va_start(ap, errstr);
 494         vfprintf(stderr, errstr, ap);
 495         va_end(ap);
 496         exit(EXIT_FAILURE);
 497 }
 498
 499 void
 500 drawbar(void) {
 501         int x;
 502         unsigned int i, occ = 0, urg = 0;
 503         unsigned long *col;
 504         Client *c;
 505
 506         for(c = clients; c; c = c->next) {
 507                 occ |= c->tags;
 508                 if(c->isurgent)
 509                         urg |= c->tags;
 510         }
 511
 512         dc.x = 0;
 513         for(i = 0; i < LENGTH(tags); i++) {
 514                 dc.w = TEXTW(tags[i]);
 515                 col = tagset[seltags] & 1 << i ? dc.sel : dc.norm;
 516                 drawtext(tags[i], col, urg & 1 << i);
 517                 drawsquare(sel && sel->tags & 1 << i, occ & 1 << i, urg & 1 << i, col);
 518                 dc.x += dc.w;
 519         }
 520         if(blw > 0) {
 521                 dc.w = blw;
 522                 drawtext(lt[sellt]->symbol, dc.norm, False);
 523                 x = dc.x + dc.w;
 524         }
 525         else
 526                 x = dc.x;
 527         dc.w = TEXTW(stext);
 528         dc.x = ww - dc.w;
 529         if(dc.x < x) {
 530                 dc.x = x;
 531                 dc.w = ww - x;
 532         }
 533         drawtext(stext, dc.norm, False);
 534         if((dc.w = dc.x - x) > bh) {
 535                 dc.x = x;
 536                 if(sel) {
 537                         drawtext(sel->name, dc.sel, False);
 538                         drawsquare(sel->isfixed, sel->isfloating, False, dc.sel);
 539                 }
 540                 else
 541                         drawtext(NULL, dc.norm, False);
 542         }
 543         XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, ww, bh, 0, 0);
 544         XSync(dpy, False);
 545 }
 546
 547 void
 548 drawsquare(Bool filled, Bool empty, Bool invert, unsigned long col[ColLast]) {
 549         int x;
 550         XGCValues gcv;
 551         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 552
 553         gcv.foreground = col[invert ? ColBG : ColFG];
 554         XChangeGC(dpy, dc.gc, GCForeground, &gcv);
 555         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 556         r.x = dc.x + 1;
 557         r.y = dc.y + 1;
 558         if(filled) {
 559                 r.width = r.height = x + 1;
 560                 XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 561         }
 562         else if(empty) {
 563                 r.width = r.height = x;
 564                 XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 565         }
 566 }
 567
 568 void
 569 drawtext(const char *text, unsigned long col[ColLast], Bool invert) {
 570         int i, x, y, h, len, olen;
 571         XRectangle r = { dc.x, dc.y, dc.w, dc.h };
 572         char buf[256];
 573
 574         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG]);
 575         XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
 576         if(!text)
 577                 return;
 578         olen = strlen(text);
 579         len = MIN(olen, sizeof buf);
 580         memcpy(buf, text, len);
 581         h = dc.font.ascent + dc.font.descent;
 582         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 583         x = dc.x + (h / 2);
 584         /* shorten text if necessary */
 585         for(; len && (i = textnw(buf, len)) > dc.w - h; len--);
 586         if(!len)
 587                 return;
 588         if(len < olen)
 589                 for(i = len; i && i > len - 3; buf[--i] = '.');
 590         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG]);
 591         if(dc.font.set)
 592                 XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
 593         else
 594                 XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
 595 }
 596
 597 void
 598 enternotify(XEvent *e) {
 599         Client *c;
 600         XCrossingEvent *ev = &e->xcrossing;
 601
 602         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 603                 return;
 604         if((c = getclient(ev->window)))
 605                 focus(c);
 606         else
 607                 focus(NULL);
 608 }
 609
 610 void
 611 expose(XEvent *e) {
 612         XExposeEvent *ev = &e->xexpose;
 613
 614         if(ev->count == 0 && (ev->window == barwin))
 615                 drawbar();
 616 }
 617
 618 void
 619 focus(Client *c) {
 620         if(!c || !ISVISIBLE(c))
 621                 for(c = stack; c && !ISVISIBLE(c); c = c->snext);
 622         if(sel && sel != c) {
 623                 grabbuttons(sel, False);
 624                 XSetWindowBorder(dpy, sel->win, dc.norm[ColBorder]);
 625         }
 626         if(c) {
 627                 detachstack(c);
 628                 attachstack(c);
 629                 grabbuttons(c, True);
 630                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder]);
 631                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
 632         }
 633         else
 634                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 635         sel = c;
 636         drawbar();
 637 }
 638
 639 void
 640 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 641         XFocusChangeEvent *ev = &e->xfocus;
 642
 643         if(sel && ev->window != sel->win)
 644                 XSetInputFocus(dpy, sel->win, RevertToPointerRoot, CurrentTime);
 645 }
 646
 647 void
 648 focusstack(const Arg *arg) {
 649         Client *c = NULL, *i;
 650
 651         if(!sel)
 652                 return;
 653         if (arg->i > 0) {
 654                 for(c = sel->next; c && !ISVISIBLE(c); c = c->next);
 655                 if(!c)
 656                         for(c = clients; c && !ISVISIBLE(c); c = c->next);
 657         }
 658         else {
 659                 for(i = clients; i != sel; i = i->next)
 660                         if(ISVISIBLE(i))
 661                                 c = i;
 662                 if(!c)
 663                         for(; i; i = i->next)
 664                                 if(ISVISIBLE(i))
 665                                         c = i;
 666         }
 667         if(c) {
 668                 focus(c);
 669                 restack();
 670         }
 671 }
 672
 673 Client *
 674 getclient(Window w) {
 675         Client *c;
 676
 677         for(c = clients; c && c->win != w; c = c->next);
 678         return c;
 679 }
 680
 681 unsigned long
 682 getcolor(const char *colstr) {
 683         Colormap cmap = DefaultColormap(dpy, screen);
 684         XColor color;
 685
 686         if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
 687                 die("error, cannot allocate color '%s'\n", colstr);
 688         return color.pixel;
 689 }
 690
 691 long
 692 getstate(Window w) {
 693         int format, status;
 694         long result = -1;
 695         unsigned char *p = NULL;
 696         unsigned long n, extra;
 697         Atom real;
 698
 699         status = XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 700                         &real, &format, &n, &extra, (unsigned char **)&p);
 701         if(status != Success)
 702                 return -1;
 703         if(n != 0)
 704                 result = *p;
 705         XFree(p);
 706         return result;
 707 }
 708
 709 Bool
 710 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 711         char **list = NULL;
 712         int n;
 713         XTextProperty name;
 714
 715         if(!text || size == 0)
 716                 return False;
 717         text[0] = '\0';
 718         XGetTextProperty(dpy, w, &name, atom);
 719         if(!name.nitems)
 720                 return False;
 721         if(name.encoding == XA_STRING)
 722                 strncpy(text, (char *)name.value, size - 1);
 723         else {
 724                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success
 725                 && n > 0 && *list) {
 726                         strncpy(text, *list, size - 1);
 727                         XFreeStringList(list);
 728                 }
 729         }
 730         text[size - 1] = '\0';
 731         XFree(name.value);
 732         return True;
 733 }
 734
 735 void
 736 grabbuttons(Client *c, Bool focused) {
 737         unsigned int i, j;
 738         unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 739
 740         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
 741         if(focused) {
 742                 for(i = 0; i < LENGTH(buttons); i++)
 743                         if(buttons[i].click == ClkClientWin)
 744                                 for(j = 0; j < LENGTH(modifiers); j++)
 745                                         XGrabButton(dpy, buttons[i].button, buttons[i].mask | modifiers[j], c->win, False, BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 746         } else
 747                 XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
 748                             BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
 749 }
 750
 751 void
 752 grabkeys(void) {
 753         unsigned int i, j;
 754         unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
 755         KeyCode code;
 756         XModifierKeymap *modmap;
 757
 758         /* init modifier map */
 759         modmap = XGetModifierMapping(dpy);
 760         for(i = 0; i < 8; i++)
 761                 for(j = 0; j < modmap->max_keypermod; j++) {
 762                         if(modmap->modifiermap[i * modmap->max_keypermod + j] == XKeysymToKeycode(dpy, XK_Num_Lock))
 763                                 numlockmask = (1 << i);
 764                 }
 765         XFreeModifiermap(modmap);
 766
 767         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 768         for(i = 0; i < LENGTH(keys); i++) {
 769                 code = XKeysymToKeycode(dpy, keys[i].keysym);
 770                 for(j = 0; j < LENGTH(modifiers); j++)
 771                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root, True,
 772                                  GrabModeAsync, GrabModeAsync);
 773         }
 774 }
 775
 776 void
 777 initfont(const char *fontstr) {
 778         char *def, **missing;
 779         int i, n;
 780
 781         missing = NULL;
 782         if(dc.font.set)
 783                 XFreeFontSet(dpy, dc.font.set);
 784         dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
 785         if(missing) {
 786                 while(n--)
 787                         fprintf(stderr, "dwm: missing fontset: %s\n", missing[n]);
 788                 XFreeStringList(missing);
 789         }
 790         if(dc.font.set) {
 791                 XFontSetExtents *font_extents;
 792                 XFontStruct **xfonts;
 793                 char **font_names;
 794                 dc.font.ascent = dc.font.descent = 0;
 795                 font_extents = XExtentsOfFontSet(dc.font.set);
 796                 n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
 797                 for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
 798                         dc.font.ascent = MAX(dc.font.ascent, (*xfonts)->ascent);
 799                         dc.font.descent = MAX(dc.font.descent,(*xfonts)->descent);
 800                         xfonts++;
 801                 }
 802         }
 803         else {
 804                 if(dc.font.xfont)
 805                         XFreeFont(dpy, dc.font.xfont);
 806                 dc.font.xfont = NULL;
 807                 if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
 808                 && !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
 809                         die("error, cannot load font: '%s'\n", fontstr);
 810                 dc.font.ascent = dc.font.xfont->ascent;
 811                 dc.font.descent = dc.font.xfont->descent;
 812         }
 813         dc.font.height = dc.font.ascent + dc.font.descent;
 814 }
 815
 816 Bool
 817 isprotodel(Client *c) {
 818         int i, n;
 819         Atom *protocols;
 820         Bool ret = False;
 821
 822         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
 823                 for(i = 0; !ret && i < n; i++)
 824                         if(protocols[i] == wmatom[WMDelete])
 825                                 ret = True;
 826                 XFree(protocols);
 827         }
 828         return ret;
 829 }
 830
 831 void
 832 keypress(XEvent *e) {
 833         unsigned int i;
 834         KeySym keysym;
 835         XKeyEvent *ev;
 836
 837         ev = &e->xkey;
 838         keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
 839         for(i = 0; i < LENGTH(keys); i++)
 840                 if(keysym == keys[i].keysym
 841                    && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
 842                    && keys[i].func)
 843                         keys[i].func(&(keys[i].arg));
 844 }
 845
 846 void
 847 killclient(const Arg *arg) {
 848         XEvent ev;
 849
 850         if(!sel)
 851                 return;
 852         if(isprotodel(sel)) {
 853                 ev.type = ClientMessage;
 854                 ev.xclient.window = sel->win;
 855                 ev.xclient.message_type = wmatom[WMProtocols];
 856                 ev.xclient.format = 32;
 857                 ev.xclient.data.l[0] = wmatom[WMDelete];
 858                 ev.xclient.data.l[1] = CurrentTime;
 859                 XSendEvent(dpy, sel->win, False, NoEventMask, &ev);
 860         }
 861         else
 862                 XKillClient(dpy, sel->win);
 863 }
 864
 865 void
 866 manage(Window w, XWindowAttributes *wa) {
 867         Client *c, *t = NULL;
 868         Window trans;
 869         XWindowChanges wc;
 870
 871         if(!(c = calloc(1, sizeof(Client))))
 872                 die("fatal: could not calloc() %u bytes\n", sizeof(Client));
 873         c->win = w;
 874
 875         /* geometry */
 876         c->x = wa->x;
 877         c->y = wa->y;
 878         c->w = wa->width;
 879         c->h = wa->height;
 880         c->oldbw = wa->border_width;
 881         if(c->w == sw && c->h == sh) {
 882                 c->x = sx;
 883                 c->y = sy;
 884                 c->bw = 0;
 885         }
 886         else {
 887                 if(c->x + c->w + 2 * c->bw > sx + sw)
 888                         c->x = sx + sw - c->w - 2 * c->bw;
 889                 if(c->y + c->h + 2 * c->bw > sy + sh)
 890                         c->y = sy + sh - c->h - 2 * c->bw;
 891                 c->x = MAX(c->x, sx);
 892                 /* only fix client y-offset, if the client center might cover the bar */
 893                 c->y = MAX(c->y, ((by == 0) && (c->x + (c->w / 2) >= wx) && (c->x + (c->w / 2) < wx + ww)) ? bh : sy);
 894                 c->bw = borderpx;
 895         }
 896
 897         wc.border_width = c->bw;
 898         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 899         XSetWindowBorder(dpy, w, dc.norm[ColBorder]);
 900         configure(c); /* propagates border_width, if size doesn't change */
 901         updatesizehints(c);
 902         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 903         grabbuttons(c, False);
 904         updatetitle(c);
 905         if(XGetTransientForHint(dpy, w, &trans))
 906                 t = getclient(trans);
 907         if(t)
 908                 c->tags = t->tags;
 909         else
 910                 applyrules(c);
 911         if(!c->isfloating)
 912                 c->isfloating = trans || c->isfixed;
 913         if(c->isfloating)
 914                 XRaiseWindow(dpy, c->win);
 915         attach(c);
 916         attachstack(c);
 917         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
 918         XMapWindow(dpy, c->win);
 919         setclientstate(c, NormalState);
 920         arrange();
 921 }
 922
 923 void
 924 mappingnotify(XEvent *e) {
 925         XMappingEvent *ev = &e->xmapping;
 926
 927         XRefreshKeyboardMapping(ev);
 928         if(ev->request == MappingKeyboard)
 929                 grabkeys();
 930 }
 931
 932 void
 933 maprequest(XEvent *e) {
 934         static XWindowAttributes wa;
 935         XMapRequestEvent *ev = &e->xmaprequest;
 936
 937         if(!XGetWindowAttributes(dpy, ev->window, &wa))
 938                 return;
 939         if(wa.override_redirect)
 940                 return;
 941         if(!getclient(ev->window))
 942                 manage(ev->window, &wa);
 943 }
 944
 945 void
 946 monocle(void) {
 947         Client *c;
 948
 949         for(c = nexttiled(clients); c; c = nexttiled(c->next))
 950                 resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
 951 }
 952
 953 void
 954 movemouse(const Arg *arg) {
 955         int x, y, ocx, ocy, di, nx, ny;
 956         unsigned int dui;
 957         Client *c;
 958         Window dummy;
 959         XEvent ev;
 960
 961         if(!(c = sel))
 962                 return;
 963         restack();
 964         ocx = nx = c->x;
 965         ocy = ny = c->y;
 966         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
 967         None, cursor[CurMove], CurrentTime) != GrabSuccess)
 968                 return;
 969         XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui);
 970         for(;;) {
 971                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
 972                 switch (ev.type) {
 973                 case ButtonRelease:
 974                         XUngrabPointer(dpy, CurrentTime);
 975                         return;
 976                 case ConfigureRequest:
 977                 case Expose:
 978                 case MapRequest:
 979                         handler[ev.type](&ev);
 980                         break;
 981                 case MotionNotify:
 982                         XSync(dpy, False);
 983                         nx = ocx + (ev.xmotion.x - x);
 984                         ny = ocy + (ev.xmotion.y - y);
 985                         if(snap && nx >= wx && nx <= wx + ww
 986                                 && ny >= wy && ny <= wy + wh) {
 987                                 if(abs(wx - nx) < snap)
 988                                         nx = wx;
 989                                 else if(abs((wx + ww) - (nx + c->w + 2 * c->bw)) < snap)
 990                                         nx = wx + ww - c->w - 2 * c->bw;
 991                                 if(abs(wy - ny) < snap)
 992                                         ny = wy;
 993                                 else if(abs((wy + wh) - (ny + c->h + 2 * c->bw)) < snap)
 994                                         ny = wy + wh - c->h - 2 * c->bw;
 995                                 if(!c->isfloating && lt[sellt]->arrange && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
 996                                         togglefloating(NULL);
 997                         }
 998                         if(!lt[sellt]->arrange || c->isfloating)
 999                                 resize(c, nx, ny, c->w, c->h, False);
1000                         break;
1001                 }
1002         }
1003 }
1004
1005 Client *
1006 nexttiled(Client *c) {
1007         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1008         return c;
1009 }
1010
1011 void
1012 propertynotify(XEvent *e) {
1013         Client *c;
1014         Window trans;
1015         XPropertyEvent *ev = &e->xproperty;
1016
1017         if(ev->state == PropertyDelete)
1018                 return; /* ignore */
1019         if((c = getclient(ev->window))) {
1020                 switch (ev->atom) {
1021                 default: break;
1022                 case XA_WM_TRANSIENT_FOR:
1023                         XGetTransientForHint(dpy, c->win, &trans);
1024                         if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
1025                                 arrange();
1026                         break;
1027                 case XA_WM_NORMAL_HINTS:
1028                         updatesizehints(c);
1029                         break;
1030                 case XA_WM_HINTS:
1031                         updatewmhints(c);
1032                         drawbar();
1033                         break;
1034                 }
1035                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1036                         updatetitle(c);
1037                         if(c == sel)
1038                                 drawbar();
1039                 }
1040         }
1041 }
1042
1043 void
1044 quit(const Arg *arg) {
1045         readin = running = False;
1046 }
1047
1048 void
1049 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
1050         XWindowChanges wc;
1051
1052         if(sizehints) {
1053                 /* set minimum possible */
1054                 w = MAX(1, w);
1055                 h = MAX(1, h);
1056
1057                 /* temporarily remove base dimensions */
1058                 w -= c->basew;
1059                 h -= c->baseh;
1060
1061                 /* adjust for aspect limits */
1062                 if(c->mina > 0 && c->maxa > 0) {
1063                         if(c->maxa < (float) w/h)
1064                                 w = h * c->maxa;
1065                         else if(c->mina > (float) h/w)
1066                                 h = w * c->mina;
1067                 }
1068
1069                 /* adjust for increment value */
1070                 if(c->incw)
1071                         w -= w % c->incw;
1072                 if(c->inch)
1073                         h -= h % c->inch;
1074
1075                 /* restore base dimensions */
1076                 w += c->basew;
1077                 h += c->baseh;
1078
1079                 w = MAX(w, c->minw);
1080                 h = MAX(h, c->minh);
1081
1082                 if(c->maxw)
1083                         w = MIN(w, c->maxw);
1084
1085                 if(c->maxh)
1086                         h = MIN(h, c->maxh);
1087         }
1088         if(w <= 0 || h <= 0)
1089                 return;
1090         if(x > sx + sw)
1091                 x = sw - w - 2 * c->bw;
1092         if(y > sy + sh)
1093                 y = sh - h - 2 * c->bw;
1094         if(x + w + 2 * c->bw < sx)
1095                 x = sx;
1096         if(y + h + 2 * c->bw < sy)
1097                 y = sy;
1098         if(h < bh)
1099                 h = bh;
1100         if(w < bh)
1101                 w = bh;
1102         if(c->x != x || c->y != y || c->w != w || c->h != h) {
1103                 c->x = wc.x = x;
1104                 c->y = wc.y = y;
1105                 c->w = wc.width = w;
1106                 c->h = wc.height = h;
1107                 wc.border_width = c->bw;
1108                 XConfigureWindow(dpy, c->win,
1109                                 CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1110                 configure(c);
1111                 XSync(dpy, False);
1112         }
1113 }
1114
1115 void
1116 resizemouse(const Arg *arg) {
1117         int ocx, ocy;
1118         int nw, nh;
1119         Client *c;
1120         XEvent ev;
1121
1122         if(!(c = sel))
1123                 return;
1124         restack();
1125         ocx = c->x;
1126         ocy = c->y;
1127         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1128         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1129                 return;
1130         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1131         for(;;) {
1132                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask , &ev);
1133                 switch(ev.type) {
1134                 case ButtonRelease:
1135                         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0,
1136                                         c->w + c->bw - 1, c->h + c->bw - 1);
1137                         XUngrabPointer(dpy, CurrentTime);
1138                         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1139                         return;
1140                 case ConfigureRequest:
1141                 case Expose:
1142                 case MapRequest:
1143                         handler[ev.type](&ev);
1144                         break;
1145                 case MotionNotify:
1146                         XSync(dpy, False);
1147                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1148                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1149
1150                         if(snap && nw >= wx && nw <= wx + ww
1151                                 && nh >= wy && nh <= wy + wh) {
1152                                 if(!c->isfloating && lt[sellt]->arrange
1153                                    && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1154                                         togglefloating(NULL);
1155                         }
1156                         if(!lt[sellt]->arrange || c->isfloating)
1157                                 resize(c, c->x, c->y, nw, nh, True);
1158                         break;
1159                 }
1160         }
1161 }
1162
1163 void
1164 restack(void) {
1165         Client *c;
1166         XEvent ev;
1167         XWindowChanges wc;
1168
1169         drawbar();
1170         if(!sel)
1171                 return;
1172         if(sel->isfloating || !lt[sellt]->arrange)
1173                 XRaiseWindow(dpy, sel->win);
1174         if(lt[sellt]->arrange) {
1175                 wc.stack_mode = Below;
1176                 wc.sibling = barwin;
1177                 for(c = stack; c; c = c->snext)
1178                         if(!c->isfloating && ISVISIBLE(c)) {
1179                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1180                                 wc.sibling = c->win;
1181                         }
1182         }
1183         XSync(dpy, False);
1184         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1185 }
1186
1187 void
1188 run(void) {
1189         char *p;
1190         char sbuf[sizeof stext];
1191         fd_set rd;
1192         int r, xfd;
1193         unsigned int len, offset;
1194         XEvent ev;
1195
1196         /* main event loop, also reads status text from stdin */
1197         XSync(dpy, False);
1198         xfd = ConnectionNumber(dpy);
1199         offset = 0;
1200         len = sizeof stext - 1;
1201         sbuf[len] = stext[len] = '\0'; /* 0-terminator is never touched */
1202         while(running) {
1203                 FD_ZERO(&rd);
1204                 if(readin)
1205                         FD_SET(STDIN_FILENO, &rd);
1206                 FD_SET(xfd, &rd);
1207                 if(select(xfd + 1, &rd, NULL, NULL, NULL) == -1) {
1208                         if(errno == EINTR)
1209                                 continue;
1210                         die("select failed\n");
1211                 }
1212                 if(FD_ISSET(STDIN_FILENO, &rd)) {
1213                         switch((r = read(STDIN_FILENO, sbuf + offset, len - offset))) {
1214                         case -1:
1215                                 strncpy(stext, strerror(errno), len);
1216                                 readin = False;
1217                                 break;
1218                         case 0:
1219                                 strncpy(stext, "EOF", 4);
1220                                 readin = False;
1221                                 break;
1222                         default:
1223                                 for(p = sbuf + offset; r > 0; p++, r--, offset++)
1224                                         if(*p == '\n' || *p == '\0') {
1225                                                 *p = '\0';
1226                                                 strncpy(stext, sbuf, len);
1227                                                 p += r - 1; /* p is sbuf + offset + r - 1 */
1228                                                 for(r = 0; *(p - r) && *(p - r) != '\n'; r++);
1229                                                 offset = r;
1230                                                 if(r)
1231                                                         memmove(sbuf, p - r + 1, r);
1232                                                 break;
1233                                         }
1234                                 break;
1235                         }
1236                         drawbar();
1237                 }
1238                 while(XPending(dpy)) {
1239                         XNextEvent(dpy, &ev);
1240                         if(handler[ev.type])
1241                                 (handler[ev.type])(&ev); /* call handler */
1242                 }
1243         }
1244 }
1245
1246 void
1247 scan(void) {
1248         unsigned int i, num;
1249         Window *wins, d1, d2;
1250         XWindowAttributes wa;
1251
1252         wins = NULL;
1253         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1254                 for(i = 0; i < num; i++) {
1255                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1256                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1257                                 continue;
1258                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1259                                 manage(wins[i], &wa);
1260                 }
1261                 for(i = 0; i < num; i++) { /* now the transients */
1262                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1263                                 continue;
1264                         if(XGetTransientForHint(dpy, wins[i], &d1)
1265                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1266                                 manage(wins[i], &wa);
1267                 }
1268         }
1269         if(wins)
1270                 XFree(wins);
1271 }
1272
1273 void
1274 setclientstate(Client *c, long state) {
1275         long data[] = {state, None};
1276
1277         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1278                         PropModeReplace, (unsigned char *)data, 2);
1279 }
1280
1281 void
1282 setlayout(const Arg *arg) {
1283         if(!arg || !arg->v || arg->v != lt[sellt])
1284                 sellt ^= 1;
1285         if(arg && arg->v)
1286                 lt[sellt] = (Layout *)arg->v;
1287         if(sel)
1288                 arrange();
1289         else
1290                 drawbar();
1291 }
1292
1293 /* arg > 1.0 will set mfact absolutly */
1294 void
1295 setmfact(const Arg *arg) {
1296         float f;
1297
1298         if(!arg || !lt[sellt]->arrange)
1299                 return;
1300         f = arg->f < 1.0 ? arg->f + mfact : arg->f - 1.0;
1301         if(f < 0.1 || f > 0.9)
1302                 return;
1303         mfact = f;
1304         arrange();
1305 }
1306
1307 void
1308 setup(void) {
1309         unsigned int i;
1310         int w;
1311         XSetWindowAttributes wa;
1312
1313         /* init screen */
1314         screen = DefaultScreen(dpy);
1315         root = RootWindow(dpy, screen);
1316         initfont(font);
1317         sx = 0;
1318         sy = 0;
1319         sw = DisplayWidth(dpy, screen);
1320         sh = DisplayHeight(dpy, screen);
1321         bh = dc.h = dc.font.height + 2;
1322         lt[0] = &layouts[0];
1323         lt[1] = &layouts[1 % LENGTH(layouts)];
1324         updategeom();
1325
1326         /* init atoms */
1327         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1328         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1329         wmatom[WMName] = XInternAtom(dpy, "WM_NAME", False);
1330         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1331         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1332         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1333
1334         /* init cursors */
1335         wa.cursor = cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1336         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1337         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1338
1339         /* init appearance */
1340         dc.norm[ColBorder] = getcolor(normbordercolor);
1341         dc.norm[ColBG] = getcolor(normbgcolor);
1342         dc.norm[ColFG] = getcolor(normfgcolor);
1343         dc.sel[ColBorder] = getcolor(selbordercolor);
1344         dc.sel[ColBG] = getcolor(selbgcolor);
1345         dc.sel[ColFG] = getcolor(selfgcolor);
1346         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1347         dc.gc = XCreateGC(dpy, root, 0, 0);
1348         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1349         if(!dc.font.set)
1350                 XSetFont(dpy, dc.gc, dc.font.xfont->fid);
1351
1352         /* init bar */
1353         for(blw = i = 0; LENGTH(layouts) > 1 && i < LENGTH(layouts); i++) {
1354                 w = TEXTW(layouts[i].symbol);
1355                 blw = MAX(blw, w);
1356         }
1357
1358         wa.override_redirect = 1;
1359         wa.background_pixmap = ParentRelative;
1360         wa.event_mask = ButtonPressMask|ExposureMask;
1361
1362         barwin = XCreateWindow(dpy, root, wx, by, ww, bh, 0, DefaultDepth(dpy, screen),
1363                         CopyFromParent, DefaultVisual(dpy, screen),
1364                         CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1365         XDefineCursor(dpy, barwin, cursor[CurNormal]);
1366         XMapRaised(dpy, barwin);
1367         strcpy(stext, "dwm-"VERSION);
1368         drawbar();
1369
1370         /* EWMH support per view */
1371         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1372                         PropModeReplace, (unsigned char *) netatom, NetLast);
1373
1374         /* select for events */
1375         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask
1376                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask;
1377         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1378         XSelectInput(dpy, root, wa.event_mask);
1379
1380
1381         /* grab keys */
1382         grabkeys();
1383 }
1384
1385 void
1386 spawn(const Arg *arg) {
1387         /* The double-fork construct avoids zombie processes and keeps the code
1388          * clean from stupid signal handlers. */
1389         if(fork() == 0) {
1390                 if(fork() == 0) {
1391                         if(dpy)
1392                                 close(ConnectionNumber(dpy));
1393                         setsid();
1394                         execvp(((char **)arg->v)[0], (char **)arg->v);
1395                         fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1396                         perror(" failed");
1397                 }
1398                 exit(0);
1399         }
1400         wait(0);
1401 }
1402
1403 void
1404 tag(const Arg *arg) {
1405         if(sel && arg->ui & TAGMASK) {
1406                 sel->tags = arg->ui & TAGMASK;
1407                 arrange();
1408         }
1409 }
1410
1411 int
1412 textnw(const char *text, unsigned int len) {
1413         XRectangle r;
1414
1415         if(dc.font.set) {
1416                 XmbTextExtents(dc.font.set, text, len, NULL, &r);
1417                 return r.width;
1418         }
1419         return XTextWidth(dc.font.xfont, text, len);
1420 }
1421
1422 void
1423 tile(void) {
1424         int x, y, h, w, mw;
1425         unsigned int i, n;
1426         Client *c;
1427
1428         for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
1429         if(n == 0)
1430                 return;
1431
1432         /* master */
1433         c = nexttiled(clients);
1434         mw = mfact * ww;
1435         resize(c, wx, wy, (n == 1 ? ww : mw) - 2 * c->bw, wh - 2 * c->bw, resizehints);
1436
1437         if(--n == 0)
1438                 return;
1439
1440         /* tile stack */
1441         x = (wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + mw;
1442         y = wy;
1443         w = (wx + mw > c->x + c->w) ? wx + ww - x : ww - mw;
1444         h = wh / n;
1445         if(h < bh)
1446                 h = wh;
1447
1448         for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
1449                 resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
1450                        ? (wy + wh) - y : h) - 2 * c->bw, resizehints);
1451                 if(h != wh)
1452                         y = c->y + c->h + 2 * c->bw;
1453         }
1454 }
1455
1456 void
1457 togglebar(const Arg *arg) {
1458         showbar = !showbar;
1459         updategeom();
1460         updatebar();
1461         arrange();
1462 }
1463
1464 void
1465 togglefloating(const Arg *arg) {
1466         if(!sel)
1467                 return;
1468         sel->isfloating = !sel->isfloating || sel->isfixed;
1469         if(sel->isfloating)
1470                 resize(sel, sel->x, sel->y, sel->w, sel->h, True);
1471         arrange();
1472 }
1473
1474 void
1475 toggletag(const Arg *arg) {
1476         unsigned int mask = sel->tags ^ (arg->ui & TAGMASK);
1477
1478         if(sel && mask) {
1479                 sel->tags = mask;
1480                 arrange();
1481         }
1482 }
1483
1484 void
1485 toggleview(const Arg *arg) {
1486         unsigned int mask = tagset[seltags] ^ (arg->ui & TAGMASK);
1487
1488         if(mask) {
1489                 tagset[seltags] = mask;
1490                 clearurgent();
1491                 arrange();
1492         }
1493 }
1494
1495 void
1496 unmanage(Client *c) {
1497         XWindowChanges wc;
1498
1499         wc.border_width = c->oldbw;
1500         /* The server grab construct avoids race conditions. */
1501         XGrabServer(dpy);
1502         XSetErrorHandler(xerrordummy);
1503         XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1504         detach(c);
1505         detachstack(c);
1506         if(sel == c)
1507                 focus(NULL);
1508         XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1509         setclientstate(c, WithdrawnState);
1510         free(c);
1511         XSync(dpy, False);
1512         XSetErrorHandler(xerror);
1513         XUngrabServer(dpy);
1514         arrange();
1515 }
1516
1517 void
1518 unmapnotify(XEvent *e) {
1519         Client *c;
1520         XUnmapEvent *ev = &e->xunmap;
1521
1522         if((c = getclient(ev->window)))
1523                 unmanage(c);
1524 }
1525
1526 void
1527 updatebar(void) {
1528         if(dc.drawable != 0)
1529                 XFreePixmap(dpy, dc.drawable);
1530         dc.drawable = XCreatePixmap(dpy, root, ww, bh, DefaultDepth(dpy, screen));
1531         XMoveResizeWindow(dpy, barwin, wx, by, ww, bh);
1532 }
1533
1534 void
1535 updategeom(void) {
1536 #ifdef XINERAMA
1537         int n, i = 0;
1538         XineramaScreenInfo *info = NULL;
1539
1540         /* window area geometry */
1541         if(XineramaIsActive(dpy) && (info = XineramaQueryScreens(dpy, &n))) {
1542                 if(n > 1) {
1543                         int di, x, y;
1544                         unsigned int dui;
1545                         Window dummy;
1546                         if(XQueryPointer(dpy, root, &dummy, &dummy, &x, &y, &di, &di, &dui))
1547                                 for(i = 0; i < n; i++)
1548                                         if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
1549                                                 break;
1550                 }
1551                 wx = info[i].x_org;
1552                 wy = showbar && topbar ?  info[i].y_org + bh : info[i].y_org;
1553                 ww = info[i].width;
1554                 wh = showbar ? info[i].height - bh : info[i].height;
1555                 XFree(info);
1556         }
1557         else
1558 #endif
1559         {
1560                 wx = sx;
1561                 wy = showbar && topbar ? sy + bh : sy;
1562                 ww = sw;
1563                 wh = showbar ? sh - bh : sh;
1564         }
1565
1566         /* bar position */
1567         by = showbar ? (topbar ? wy - bh : wy + wh) : -bh;
1568 }
1569
1570 void
1571 updatesizehints(Client *c) {
1572         long msize;
1573         XSizeHints size;
1574
1575         XGetWMNormalHints(dpy, c->win, &size, &msize);
1576         if(size.flags & PBaseSize) {
1577                 c->basew = size.base_width;
1578                 c->baseh = size.base_height;
1579         }
1580         else if(size.flags & PMinSize) {
1581                 c->basew = size.min_width;
1582                 c->baseh = size.min_height;
1583         }
1584         else
1585                 c->basew = c->baseh = 0;
1586         if(size.flags & PResizeInc) {
1587                 c->incw = size.width_inc;
1588                 c->inch = size.height_inc;
1589         }
1590         else
1591                 c->incw = c->inch = 0;
1592         if(size.flags & PMaxSize) {
1593                 c->maxw = size.max_width;
1594                 c->maxh = size.max_height;
1595         }
1596         else
1597                 c->maxw = c->maxh = 0;
1598         if(size.flags & PMinSize) {
1599                 c->minw = size.min_width;
1600                 c->minh = size.min_height;
1601         }
1602         else if(size.flags & PBaseSize) {
1603                 c->minw = size.base_width;
1604                 c->minh = size.base_height;
1605         }
1606         else
1607                 c->minw = c->minh = 0;
1608         if(size.flags & PAspect) {
1609                 c->mina = (float)size.min_aspect.y / (float)size.min_aspect.x;
1610                 c->maxa = (float)size.max_aspect.x / (float)size.max_aspect.y;
1611         }
1612         else
1613                 c->maxa = c->mina = 0.0;
1614         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
1615                         && c->maxw == c->minw && c->maxh == c->minh);
1616 }
1617
1618 void
1619 updatetitle(Client *c) {
1620         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
1621                 gettextprop(c->win, wmatom[WMName], c->name, sizeof c->name);
1622 }
1623
1624 void
1625 updatewmhints(Client *c) {
1626         XWMHints *wmh;
1627
1628         if((wmh = XGetWMHints(dpy, c->win))) {
1629                 if(ISVISIBLE(c) && wmh->flags & XUrgencyHint) {
1630                         wmh->flags &= ~XUrgencyHint;
1631                         XSetWMHints(dpy, c->win, wmh);
1632                 }
1633                 else
1634                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
1635
1636                 XFree(wmh);
1637         }
1638 }
1639
1640 void
1641 view(const Arg *arg) {
1642         if(arg && (arg->ui & TAGMASK) == tagset[seltags])
1643                 return;
1644         seltags ^= 1; /* toggle sel tagset */
1645         if(arg && (arg->ui & TAGMASK))
1646                 tagset[seltags] = arg->ui & TAGMASK;
1647         clearurgent();
1648         arrange();
1649 }
1650
1651 /* There's no way to check accesses to destroyed windows, thus those cases are
1652  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
1653  * default error handler, which may call exit.  */
1654 int
1655 xerror(Display *dpy, XErrorEvent *ee) {
1656         if(ee->error_code == BadWindow
1657         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
1658         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
1659         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
1660         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
1661         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
1662         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
1663         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
1664         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
1665                 return 0;
1666         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
1667                         ee->request_code, ee->error_code);
1668         return xerrorxlib(dpy, ee); /* may call exit */
1669 }
1670
1671 int
1672 xerrordummy(Display *dpy, XErrorEvent *ee) {
1673         return 0;
1674 }
1675
1676 /* Startup Error handler to check if another window manager
1677  * is already running. */
1678 int
1679 xerrorstart(Display *dpy, XErrorEvent *ee) {
1680         otherwm = True;
1681         return -1;
1682 }
1683
1684 void
1685 zoom(const Arg *arg) {
1686         Client *c = sel;
1687
1688         if(!lt[sellt]->arrange || lt[sellt]->arrange == monocle || (sel && sel->isfloating))
1689                 return;
1690         if(c == nexttiled(clients))
1691                 if(!c || !(c = nexttiled(c->next)))
1692                         return;
1693         detach(c);
1694         attach(c);
1695         focus(c);
1696         arrange();
1697 }
1698
1699 int
1700 main(int argc, char *argv[]) {
1701         if(argc == 2 && !strcmp("-v", argv[1]))
1702                 die("dwm-"VERSION", © 2006-2008 dwm engineers, see LICENSE for details\n");
1703         else if(argc != 1)
1704                 die("usage: dwm [-v]\n");
1705
1706         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
1707                 fprintf(stderr, "warning: no locale support\n");
1708
1709         if(!(dpy = XOpenDisplay(0)))
1710                 die("dwm: cannot open display\n");
1711
1712         checkotherwm();
1713         setup();
1714         scan();
1715         run();
1716         cleanup();
1717
1718         XCloseDisplay(dpy);
1719         return 0;
1720 }