dwm.c

   1 /* See LICENSE file for copyright and license details.
   2  *
   3  * dynamic window manager is designed like any other X client as well. It is
   4  * driven through handling X events. In contrast to other X clients, a window
   5  * manager selects for SubstructureRedirectMask on the root window, to receive
   6  * events about window (dis-)appearance.  Only one X connection at a time is
   7  * allowed to select for this event mask.
   8  *
   9  * The event handlers of dwm are organized in an array which is accessed
  10  * whenever a new event has been fetched. This allows event dispatching
  11  * in O(1) time.
  12  *
  13  * Each child of the root window is called a client, except windows which have
  14  * set the override_redirect flag.  Clients are organized in a linked client
  15  * list on each monitor, the focus history is remembered through a stack list
  16  * on each monitor. Each client contains a bit array to indicate the tags of a
  17  * client.
  18  *
  19  * Keys and tagging rules are organized as arrays and defined in config.h.
  20  *
  21  * To understand everything else, start reading main().
  22  */
  23 #include <errno.h>
  24 #include <locale.h>
  25 #include <stdarg.h>
  26 #include <signal.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <X11/cursorfont.h>
  34 #include <X11/keysym.h>
  35 #include <X11/Xatom.h>
  36 #include <X11/Xlib.h>
  37 #include <X11/Xproto.h>
  38 #include <X11/Xutil.h>
  39 #include <X11/XKBlib.h>
  40 #include <fontconfig/fontconfig.h>
  41 #include <X11/Xft/Xft.h>
  42 #ifdef XINERAMA
  43 #include <X11/extensions/Xinerama.h>
  44 #endif /* XINERAMA */
  45
  46 /* macros */
  47 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
  48 #define CLEANMASK(mask)         (mask & ~(numlockmask|LockMask) & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  49 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
  50                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
  51 #define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
  52 #define LENGTH(X)               (sizeof X / sizeof X[0])
  53 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
  54 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
  55 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
  56 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
  57 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
  58 #define TAGMASK                 ((1 << LENGTH(tags)) - 1)
  59 #define TEXTW(X)                (textnw(X, strlen(X)) + dc.font.height)
  60
  61 /* enums */
  62 enum { CurNormal, CurResize, CurMove, CurLast };        /* cursor */
  63 enum { ColBorder, ColFG, ColBG, ColLast };              /* color */
  64 enum { NetSupported, NetWMName, NetWMState,
  65        NetWMFullscreen, NetActiveWindow, NetWMWindowType,
  66        NetWMWindowTypeDialog, NetClientList, NetLast };     /* EWMH atoms */
  67 enum { WMProtocols, WMDelete, WMState, WMTakeFocus, WMLast }; /* default atoms */
  68 enum { ClkTagBar, ClkLtSymbol, ClkStatusText, ClkWinTitle,
  69        ClkClientWin, ClkRootWin, ClkLast };             /* clicks */
  70
  71 typedef union {
  72         int i;
  73         unsigned int ui;
  74         float f;
  75         const void *v;
  76 } Arg;
  77
  78 typedef struct {
  79         unsigned int click;
  80         unsigned int mask;
  81         unsigned int button;
  82         void (*func)(const Arg *arg);
  83         const Arg arg;
  84 } Button;
  85
  86 typedef struct Monitor Monitor;
  87 typedef struct Client Client;
  88 struct Client {
  89         char name[256];
  90         float mina, maxa;
  91         int x, y, w, h;
  92         int oldx, oldy, oldw, oldh;
  93         int basew, baseh, incw, inch, maxw, maxh, minw, minh;
  94         int bw, oldbw;
  95         unsigned int tags;
  96         Bool isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
  97         Client *next;
  98         Client *snext;
  99         Monitor *mon;
 100         Window win;
 101 };
 102
 103 typedef struct {
 104         int x, y, w, h;
 105         XftColor norm[ColLast];
 106         XftColor sel[ColLast];
 107         Drawable drawable;
 108         GC gc;
 109         struct {
 110                 int ascent;
 111                 int descent;
 112                 int height;
 113                 XftFont *xfont;
 114         } font;
 115 } DC; /* draw context */
 116
 117 typedef struct {
 118         unsigned int mod;
 119         KeySym keysym;
 120         void (*func)(const Arg *);
 121         const Arg arg;
 122 } Key;
 123
 124 typedef struct {
 125         const char *symbol;
 126         void (*arrange)(Monitor *);
 127 } Layout;
 128
 129 struct Monitor {
 130         char ltsymbol[16];
 131         float mfact;
 132         int nmaster;
 133         int num;
 134         int by;               /* bar geometry */
 135         int mx, my, mw, mh;   /* screen size */
 136         int wx, wy, ww, wh;   /* window area  */
 137         unsigned int seltags;
 138         unsigned int sellt;
 139         unsigned int tagset[2];
 140         Bool showbar;
 141         Bool topbar;
 142         Client *clients;
 143         Client *sel;
 144         Client *stack;
 145         Monitor *next;
 146         Window barwin;
 147         const Layout *lt[2];
 148 };
 149
 150 typedef struct {
 151         const char *class;
 152         const char *instance;
 153         const char *title;
 154         unsigned int tags;
 155         Bool isfloating;
 156         int monitor;
 157 } Rule;
 158
 159 /* function declarations */
 160 static void applyrules(Client *c);
 161 static Bool applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact);
 162 static void arrange(Monitor *m);
 163 static void arrangemon(Monitor *m);
 164 static void attach(Client *c);
 165 static void attachstack(Client *c);
 166 static void buttonpress(XEvent *e);
 167 static void checkotherwm(void);
 168 static void cleanup(void);
 169 static void cleanupmon(Monitor *mon);
 170 static void clearurgent(Client *c);
 171 static void clientmessage(XEvent *e);
 172 static void configure(Client *c);
 173 static void configurenotify(XEvent *e);
 174 static void configurerequest(XEvent *e);
 175 static Monitor *createmon(void);
 176 static void destroynotify(XEvent *e);
 177 static void detach(Client *c);
 178 static void detachstack(Client *c);
 179 static void die(const char *errstr, ...);
 180 static Monitor *dirtomon(int dir);
 181 static void drawbar(Monitor *m);
 182 static void drawbars(void);
 183 static void drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]);
 184 static void drawtext(const char *text, XftColor col[ColLast], Bool invert);
 185 static void enternotify(XEvent *e);
 186 static void expose(XEvent *e);
 187 static void focus(Client *c);
 188 static void focusin(XEvent *e);
 189 static void focusmon(const Arg *arg);
 190 static void focusstack(const Arg *arg);
 191 static XftColor getcolor(const char *colstr);
 192 static Bool getrootptr(int *x, int *y);
 193 static long getstate(Window w);
 194 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
 195 static void grabbuttons(Client *c, Bool focused);
 196 static void grabkeys(void);
 197 static void incnmaster(const Arg *arg);
 198 static void initfont(const char *fontstr);
 199 static void keypress(XEvent *e);
 200 static void killclient(const Arg *arg);
 201 static void manage(Window w, XWindowAttributes *wa);
 202 static void mappingnotify(XEvent *e);
 203 static void maprequest(XEvent *e);
 204 static void monocle(Monitor *m);
 205 static void motionnotify(XEvent *e);
 206 static void movemouse(const Arg *arg);
 207 static Client *nexttiled(Client *c);
 208 static void pop(Client *);
 209 static void propertynotify(XEvent *e);
 210 static void quit(const Arg *arg);
 211 static Monitor *recttomon(int x, int y, int w, int h);
 212 static void resize(Client *c, int x, int y, int w, int h, Bool interact);
 213 static void resizeclient(Client *c, int x, int y, int w, int h);
 214 static void resizemouse(const Arg *arg);
 215 static void restack(Monitor *m);
 216 static void run(void);
 217 static void scan(void);
 218 static Bool sendevent(Client *c, Atom proto);
 219 static void sendmon(Client *c, Monitor *m);
 220 static void setclientstate(Client *c, long state);
 221 static void setfocus(Client *c);
 222 static void setfullscreen(Client *c, Bool fullscreen);
 223 static void setlayout(const Arg *arg);
 224 static void setmfact(const Arg *arg);
 225 static void setup(void);
 226 static void showhide(Client *c);
 227 static void sigchld(int unused);
 228 static void spawn(const Arg *arg);
 229 static void tag(const Arg *arg);
 230 static void tagmon(const Arg *arg);
 231 static int textnw(const char *text, unsigned int len);
 232 static void tile(Monitor *);
 233 static void togglebar(const Arg *arg);
 234 static void togglefloating(const Arg *arg);
 235 static void toggletag(const Arg *arg);
 236 static void toggleview(const Arg *arg);
 237 static void unfocus(Client *c, Bool setfocus);
 238 static void unmanage(Client *c, Bool destroyed);
 239 static void unmapnotify(XEvent *e);
 240 static Bool updategeom(void);
 241 static void updatebarpos(Monitor *m);
 242 static void updatebars(void);
 243 static void updateclientlist(void);
 244 static void updatenumlockmask(void);
 245 static void updatesizehints(Client *c);
 246 static void updatestatus(void);
 247 static void updatewindowtype(Client *c);
 248 static void updatetitle(Client *c);
 249 static void updatewmhints(Client *c);
 250 static void view(const Arg *arg);
 251 static Client *wintoclient(Window w);
 252 static Monitor *wintomon(Window w);
 253 static int xerror(Display *dpy, XErrorEvent *ee);
 254 static int xerrordummy(Display *dpy, XErrorEvent *ee);
 255 static int xerrorstart(Display *dpy, XErrorEvent *ee);
 256 static void zoom(const Arg *arg);
 257
 258 /* variables */
 259 static const char broken[] = "broken";
 260 static char stext[256];
 261 static int screen;
 262 static int sw, sh;           /* X display screen geometry width, height */
 263 static int bh, blw = 0;      /* bar geometry */
 264 static int (*xerrorxlib)(Display *, XErrorEvent *);
 265 static unsigned int numlockmask = 0;
 266 static void (*handler[LASTEvent]) (XEvent *) = {
 267         [ButtonPress] = buttonpress,
 268         [ClientMessage] = clientmessage,
 269         [ConfigureRequest] = configurerequest,
 270         [ConfigureNotify] = configurenotify,
 271         [DestroyNotify] = destroynotify,
 272         [EnterNotify] = enternotify,
 273         [Expose] = expose,
 274         [FocusIn] = focusin,
 275         [KeyPress] = keypress,
 276         [MappingNotify] = mappingnotify,
 277         [MapRequest] = maprequest,
 278         [MotionNotify] = motionnotify,
 279         [PropertyNotify] = propertynotify,
 280         [UnmapNotify] = unmapnotify
 281 };
 282 static Atom wmatom[WMLast], netatom[NetLast];
 283 static Bool running = True;
 284 static Cursor cursor[CurLast];
 285 static Display *dpy;
 286 static DC dc;
 287 static Monitor *mons = NULL, *selmon = NULL;
 288 static Window root;
 289
 290 /* configuration, allows nested code to access above variables */
 291 #include "config.h"
 292
 293 /* compile-time check if all tags fit into an unsigned int bit array. */
 294 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 295
 296 /* function implementations */
 297 void
 298 applyrules(Client *c) {
 299         const char *class, *instance;
 300         unsigned int i;
 301         const Rule *r;
 302         Monitor *m;
 303         XClassHint ch = { NULL, NULL };
 304
 305         /* rule matching */
 306         c->isfloating = c->tags = 0;
 307         XGetClassHint(dpy, c->win, &ch);
 308         class    = ch.res_class ? ch.res_class : broken;
 309         instance = ch.res_name  ? ch.res_name  : broken;
 310
 311         for(i = 0; i < LENGTH(rules); i++) {
 312                 r = &rules[i];
 313                 if((!r->title || strstr(c->name, r->title))
 314                 && (!r->class || strstr(class, r->class))
 315                 && (!r->instance || strstr(instance, r->instance)))
 316                 {
 317                         c->isfloating = r->isfloating;
 318                         c->tags |= r->tags;
 319                         for(m = mons; m && m->num != r->monitor; m = m->next);
 320                         if(m)
 321                                 c->mon = m;
 322                 }
 323         }
 324         if(ch.res_class)
 325                 XFree(ch.res_class);
 326         if(ch.res_name)
 327                 XFree(ch.res_name);
 328         c->tags = c->tags & TAGMASK ? c->tags & TAGMASK : c->mon->tagset[c->mon->seltags];
 329 }
 330
 331 Bool
 332 applysizehints(Client *c, int *x, int *y, int *w, int *h, Bool interact) {
 333         Bool baseismin;
 334         Monitor *m = c->mon;
 335
 336         /* set minimum possible */
 337         *w = MAX(1, *w);
 338         *h = MAX(1, *h);
 339         if(interact) {
 340                 if(*x > sw)
 341                         *x = sw - WIDTH(c);
 342                 if(*y > sh)
 343                         *y = sh - HEIGHT(c);
 344                 if(*x + *w + 2 * c->bw < 0)
 345                         *x = 0;
 346                 if(*y + *h + 2 * c->bw < 0)
 347                         *y = 0;
 348         }
 349         else {
 350                 if(*x >= m->wx + m->ww)
 351                         *x = m->wx + m->ww - WIDTH(c);
 352                 if(*y >= m->wy + m->wh)
 353                         *y = m->wy + m->wh - HEIGHT(c);
 354                 if(*x + *w + 2 * c->bw <= m->wx)
 355                         *x = m->wx;
 356                 if(*y + *h + 2 * c->bw <= m->wy)
 357                         *y = m->wy;
 358         }
 359         if(*h < bh)
 360                 *h = bh;
 361         if(*w < bh)
 362                 *w = bh;
 363         if(resizehints || c->isfloating || !c->mon->lt[c->mon->sellt]->arrange) {
 364                 /* see last two sentences in ICCCM 4.1.2.3 */
 365                 baseismin = c->basew == c->minw && c->baseh == c->minh;
 366                 if(!baseismin) { /* temporarily remove base dimensions */
 367                         *w -= c->basew;
 368                         *h -= c->baseh;
 369                 }
 370                 /* adjust for aspect limits */
 371                 if(c->mina > 0 && c->maxa > 0) {
 372                         if(c->maxa < (float)*w / *h)
 373                                 *w = *h * c->maxa + 0.5;
 374                         else if(c->mina < (float)*h / *w)
 375                                 *h = *w * c->mina + 0.5;
 376                 }
 377                 if(baseismin) { /* increment calculation requires this */
 378                         *w -= c->basew;
 379                         *h -= c->baseh;
 380                 }
 381                 /* adjust for increment value */
 382                 if(c->incw)
 383                         *w -= *w % c->incw;
 384                 if(c->inch)
 385                         *h -= *h % c->inch;
 386                 /* restore base dimensions */
 387                 *w = MAX(*w + c->basew, c->minw);
 388                 *h = MAX(*h + c->baseh, c->minh);
 389                 if(c->maxw)
 390                         *w = MIN(*w, c->maxw);
 391                 if(c->maxh)
 392                         *h = MIN(*h, c->maxh);
 393         }
 394         return *x != c->x || *y != c->y || *w != c->w || *h != c->h;
 395 }
 396
 397 void
 398 arrange(Monitor *m) {
 399         if(m)
 400                 showhide(m->stack);
 401         else for(m = mons; m; m = m->next)
 402                 showhide(m->stack);
 403         if(m) {
 404                 arrangemon(m);
 405                 restack(m);
 406         } else for(m = mons; m; m = m->next)
 407                 arrangemon(m);
 408 }
 409
 410 void
 411 arrangemon(Monitor *m) {
 412         strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
 413         if(m->lt[m->sellt]->arrange)
 414                 m->lt[m->sellt]->arrange(m);
 415 }
 416
 417 void
 418 attach(Client *c) {
 419         c->next = c->mon->clients;
 420         c->mon->clients = c;
 421 }
 422
 423 void
 424 attachstack(Client *c) {
 425         c->snext = c->mon->stack;
 426         c->mon->stack = c;
 427 }
 428
 429 void
 430 buttonpress(XEvent *e) {
 431         unsigned int i, x, click;
 432         Arg arg = {0};
 433         Client *c;
 434         Monitor *m;
 435         XButtonPressedEvent *ev = &e->xbutton;
 436
 437         click = ClkRootWin;
 438         /* focus monitor if necessary */
 439         if((m = wintomon(ev->window)) && m != selmon) {
 440                 unfocus(selmon->sel, True);
 441                 selmon = m;
 442                 focus(NULL);
 443         }
 444         if(ev->window == selmon->barwin) {
 445                 i = x = 0;
 446                 do
 447                         x += TEXTW(tags[i]);
 448                 while(ev->x >= x && ++i < LENGTH(tags));
 449                 if(i < LENGTH(tags)) {
 450                         click = ClkTagBar;
 451                         arg.ui = 1 << i;
 452                 }
 453                 else if(ev->x < x + blw)
 454                         click = ClkLtSymbol;
 455                 else if(ev->x > selmon->ww - TEXTW(stext))
 456                         click = ClkStatusText;
 457                 else
 458                         click = ClkWinTitle;
 459         }
 460         else if((c = wintoclient(ev->window))) {
 461                 focus(c);
 462                 click = ClkClientWin;
 463         }
 464         for(i = 0; i < LENGTH(buttons); i++)
 465                 if(click == buttons[i].click && buttons[i].func && buttons[i].button == ev->button
 466                 && CLEANMASK(buttons[i].mask) == CLEANMASK(ev->state))
 467                         buttons[i].func(click == ClkTagBar && buttons[i].arg.i == 0 ? &arg : &buttons[i].arg);
 468 }
 469
 470 void
 471 checkotherwm(void) {
 472         xerrorxlib = XSetErrorHandler(xerrorstart);
 473         /* this causes an error if some other window manager is running */
 474         XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureRedirectMask);
 475         XSync(dpy, False);
 476         XSetErrorHandler(xerror);
 477         XSync(dpy, False);
 478 }
 479
 480 void
 481 cleanup(void) {
 482         Arg a = {.ui = ~0};
 483         Layout foo = { "", NULL };
 484         Monitor *m;
 485
 486         view(&a);
 487         selmon->lt[selmon->sellt] = &foo;
 488         for(m = mons; m; m = m->next)
 489                 while(m->stack)
 490                         unmanage(m->stack, False);
 491         XUngrabKey(dpy, AnyKey, AnyModifier, root);
 492         XFreePixmap(dpy, dc.drawable);
 493         XFreeGC(dpy, dc.gc);
 494         XFreeCursor(dpy, cursor[CurNormal]);
 495         XFreeCursor(dpy, cursor[CurResize]);
 496         XFreeCursor(dpy, cursor[CurMove]);
 497         while(mons)
 498                 cleanupmon(mons);
 499         XSync(dpy, False);
 500         XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 501         XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 502 }
 503
 504 void
 505 cleanupmon(Monitor *mon) {
 506         Monitor *m;
 507
 508         if(mon == mons)
 509                 mons = mons->next;
 510         else {
 511                 for(m = mons; m && m->next != mon; m = m->next);
 512                 m->next = mon->next;
 513         }
 514         XUnmapWindow(dpy, mon->barwin);
 515         XDestroyWindow(dpy, mon->barwin);
 516         free(mon);
 517 }
 518
 519 void
 520 clearurgent(Client *c) {
 521         XWMHints *wmh;
 522
 523         c->isurgent = False;
 524         if(!(wmh = XGetWMHints(dpy, c->win)))
 525                 return;
 526         wmh->flags &= ~XUrgencyHint;
 527         XSetWMHints(dpy, c->win, wmh);
 528         XFree(wmh);
 529 }
 530
 531 void
 532 clientmessage(XEvent *e) {
 533         XClientMessageEvent *cme = &e->xclient;
 534         Client *c = wintoclient(cme->window);
 535
 536         if(!c)
 537                 return;
 538         if(cme->message_type == netatom[NetWMState]) {
 539                 if(cme->data.l[1] == netatom[NetWMFullscreen] || cme->data.l[2] == netatom[NetWMFullscreen])
 540                         setfullscreen(c, (cme->data.l[0] == 1 /* _NET_WM_STATE_ADD    */
 541                                       || (cme->data.l[0] == 2 /* _NET_WM_STATE_TOGGLE */ && !c->isfullscreen)));
 542         }
 543         else if(cme->message_type == netatom[NetActiveWindow]) {
 544                 if(!ISVISIBLE(c)) {
 545                         c->mon->seltags ^= 1;
 546                         c->mon->tagset[c->mon->seltags] = c->tags;
 547                 }
 548                 pop(c);
 549         }
 550 }
 551
 552 void
 553 configure(Client *c) {
 554         XConfigureEvent ce;
 555
 556         ce.type = ConfigureNotify;
 557         ce.display = dpy;
 558         ce.event = c->win;
 559         ce.window = c->win;
 560         ce.x = c->x;
 561         ce.y = c->y;
 562         ce.width = c->w;
 563         ce.height = c->h;
 564         ce.border_width = c->bw;
 565         ce.above = None;
 566         ce.override_redirect = False;
 567         XSendEvent(dpy, c->win, False, StructureNotifyMask, (XEvent *)&ce);
 568 }
 569
 570 void
 571 configurenotify(XEvent *e) {
 572         Monitor *m;
 573         XConfigureEvent *ev = &e->xconfigure;
 574         Bool dirty;
 575
 576         // TODO: updategeom handling sucks, needs to be simplified
 577         if(ev->window == root) {
 578                 dirty = (sw != ev->width || sh != ev->height);
 579                 sw = ev->width;
 580                 sh = ev->height;
 581                 if(updategeom() || dirty) {
 582                         if(dc.drawable != 0)
 583                                 XFreePixmap(dpy, dc.drawable);
 584                         dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 585                         updatebars();
 586                         for(m = mons; m; m = m->next)
 587                                 XMoveResizeWindow(dpy, m->barwin, m->wx, m->by, m->ww, bh);
 588                         focus(NULL);
 589                         arrange(NULL);
 590                 }
 591         }
 592 }
 593
 594 void
 595 configurerequest(XEvent *e) {
 596         Client *c;
 597         Monitor *m;
 598         XConfigureRequestEvent *ev = &e->xconfigurerequest;
 599         XWindowChanges wc;
 600
 601         if((c = wintoclient(ev->window))) {
 602                 if(ev->value_mask & CWBorderWidth)
 603                         c->bw = ev->border_width;
 604                 else if(c->isfloating || !selmon->lt[selmon->sellt]->arrange) {
 605                         m = c->mon;
 606                         if(ev->value_mask & CWX) {
 607                                 c->oldx = c->x;
 608                                 c->x = m->mx + ev->x;
 609                         }
 610                         if(ev->value_mask & CWY) {
 611                                 c->oldy = c->y;
 612                                 c->y = m->my + ev->y;
 613                         }
 614                         if(ev->value_mask & CWWidth) {
 615                                 c->oldw = c->w;
 616                                 c->w = ev->width;
 617                         }
 618                         if(ev->value_mask & CWHeight) {
 619                                 c->oldh = c->h;
 620                                 c->h = ev->height;
 621                         }
 622                         if((c->x + c->w) > m->mx + m->mw && c->isfloating)
 623                                 c->x = m->mx + (m->mw / 2 - WIDTH(c) / 2); /* center in x direction */
 624                         if((c->y + c->h) > m->my + m->mh && c->isfloating)
 625                                 c->y = m->my + (m->mh / 2 - HEIGHT(c) / 2); /* center in y direction */
 626                         if((ev->value_mask & (CWX|CWY)) && !(ev->value_mask & (CWWidth|CWHeight)))
 627                                 configure(c);
 628                         if(ISVISIBLE(c))
 629                                 XMoveResizeWindow(dpy, c->win, c->x, c->y, c->w, c->h);
 630                 }
 631                 else
 632                         configure(c);
 633         }
 634         else {
 635                 wc.x = ev->x;
 636                 wc.y = ev->y;
 637                 wc.width = ev->width;
 638                 wc.height = ev->height;
 639                 wc.border_width = ev->border_width;
 640                 wc.sibling = ev->above;
 641                 wc.stack_mode = ev->detail;
 642                 XConfigureWindow(dpy, ev->window, ev->value_mask, &wc);
 643         }
 644         XSync(dpy, False);
 645 }
 646
 647 Monitor *
 648 createmon(void) {
 649         Monitor *m;
 650
 651         if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
 652                 die("fatal: could not malloc() %u bytes\n", sizeof(Monitor));
 653         m->tagset[0] = m->tagset[1] = 1;
 654         m->mfact = mfact;
 655         m->nmaster = nmaster;
 656         m->showbar = showbar;
 657         m->topbar = topbar;
 658         m->lt[0] = &layouts[0];
 659         m->lt[1] = &layouts[1 % LENGTH(layouts)];
 660         strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
 661         return m;
 662 }
 663
 664 void
 665 destroynotify(XEvent *e) {
 666         Client *c;
 667         XDestroyWindowEvent *ev = &e->xdestroywindow;
 668
 669         if((c = wintoclient(ev->window)))
 670                 unmanage(c, True);
 671 }
 672
 673 void
 674 detach(Client *c) {
 675         Client **tc;
 676
 677         for(tc = &c->mon->clients; *tc && *tc != c; tc = &(*tc)->next);
 678         *tc = c->next;
 679 }
 680
 681 void
 682 detachstack(Client *c) {
 683         Client **tc, *t;
 684
 685         for(tc = &c->mon->stack; *tc && *tc != c; tc = &(*tc)->snext);
 686         *tc = c->snext;
 687
 688         if(c == c->mon->sel) {
 689                 for(t = c->mon->stack; t && !ISVISIBLE(t); t = t->snext);
 690                 c->mon->sel = t;
 691         }
 692 }
 693
 694 void
 695 die(const char *errstr, ...) {
 696         va_list ap;
 697
 698         va_start(ap, errstr);
 699         vfprintf(stderr, errstr, ap);
 700         va_end(ap);
 701         exit(EXIT_FAILURE);
 702 }
 703
 704 Monitor *
 705 dirtomon(int dir) {
 706         Monitor *m = NULL;
 707
 708         if(dir > 0) {
 709                 if(!(m = selmon->next))
 710                         m = mons;
 711         }
 712         else if(selmon == mons)
 713                 for(m = mons; m->next; m = m->next);
 714         else
 715                 for(m = mons; m->next != selmon; m = m->next);
 716         return m;
 717 }
 718
 719 void
 720 drawbar(Monitor *m) {
 721         int x;
 722         unsigned int i, occ = 0, urg = 0;
 723         XftColor *col;
 724         Client *c;
 725
 726         for(c = m->clients; c; c = c->next) {
 727                 occ |= c->tags;
 728                 if(c->isurgent)
 729                         urg |= c->tags;
 730         }
 731         dc.x = 0;
 732         for(i = 0; i < LENGTH(tags); i++) {
 733                 dc.w = TEXTW(tags[i]);
 734                 col = m->tagset[m->seltags] & 1 << i ? dc.sel : dc.norm;
 735                 drawtext(tags[i], col, urg & 1 << i);
 736                 drawsquare(m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
 737                            occ & 1 << i, urg & 1 << i, col);
 738                 dc.x += dc.w;
 739         }
 740         dc.w = blw = TEXTW(m->ltsymbol);
 741         drawtext(m->ltsymbol, dc.norm, False);
 742         dc.x += dc.w;
 743         x = dc.x;
 744         if(m == selmon) { /* status is only drawn on selected monitor */
 745                 dc.w = TEXTW(stext);
 746                 dc.x = m->ww - dc.w;
 747                 if(dc.x < x) {
 748                         dc.x = x;
 749                         dc.w = m->ww - x;
 750                 }
 751                 drawtext(stext, dc.norm, False);
 752         }
 753         else
 754                 dc.x = m->ww;
 755         if((dc.w = dc.x - x) > bh) {
 756                 dc.x = x;
 757                 if(m->sel) {
 758                         col = m == selmon ? dc.sel : dc.norm;
 759                         drawtext(m->sel->name, col, False);
 760                         drawsquare(m->sel->isfixed, m->sel->isfloating, False, col);
 761                 }
 762                 else
 763                         drawtext(NULL, dc.norm, False);
 764         }
 765         XCopyArea(dpy, dc.drawable, m->barwin, dc.gc, 0, 0, m->ww, bh, 0, 0);
 766         XSync(dpy, False);
 767 }
 768
 769 void
 770 drawbars(void) {
 771         Monitor *m;
 772
 773         for(m = mons; m; m = m->next)
 774                 drawbar(m);
 775 }
 776
 777 void
 778 drawsquare(Bool filled, Bool empty, Bool invert, XftColor col[ColLast]) {
 779         int x;
 780
 781         XSetForeground(dpy, dc.gc, col[invert ? ColBG : ColFG].pixel);
 782         x = (dc.font.ascent + dc.font.descent + 2) / 4;
 783         if(filled)
 784                 XFillRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x+1, x+1);
 785         else if(empty)
 786                 XDrawRectangle(dpy, dc.drawable, dc.gc, dc.x+1, dc.y+1, x, x);
 787 }
 788
 789 void
 790 drawtext(const char *text, XftColor col[ColLast], Bool invert) {
 791         char buf[256];
 792         int i, x, y, h, len, olen;
 793         XftDraw *d;
 794
 795         XSetForeground(dpy, dc.gc, col[invert ? ColFG : ColBG].pixel);
 796         XFillRectangle(dpy, dc.drawable, dc.gc, dc.x, dc.y, dc.w, dc.h);
 797         if(!text)
 798                 return;
 799         olen = strlen(text);
 800         h = dc.font.ascent + dc.font.descent;
 801         y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
 802         x = dc.x + (h / 2);
 803         /* shorten text if necessary */
 804         for(len = MIN(olen, sizeof buf); len && textnw(text, len) > dc.w - h; len--);
 805         if(!len)
 806                 return;
 807         memcpy(buf, text, len);
 808         if(len < olen)
 809                 for(i = len; i && i > len - 3; buf[--i] = '.');
 810
 811         d = XftDrawCreate(dpy, dc.drawable, DefaultVisual(dpy, screen), DefaultColormap(dpy,screen));
 812
 813         XftDrawStringUtf8(d, &col[invert ? ColBG : ColFG], dc.font.xfont, x, y, (XftChar8 *) buf, len);
 814         XftDrawDestroy(d);
 815 }
 816
 817 void
 818 enternotify(XEvent *e) {
 819         Client *c;
 820         Monitor *m;
 821         XCrossingEvent *ev = &e->xcrossing;
 822
 823         if((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
 824                 return;
 825         c = wintoclient(ev->window);
 826         m = c ? c->mon : wintomon(ev->window);
 827         if(m != selmon) {
 828                 unfocus(selmon->sel, True);
 829                 selmon = m;
 830         }
 831         else if(!c || c == selmon->sel)
 832                 return;
 833         focus(c);
 834 }
 835
 836 void
 837 expose(XEvent *e) {
 838         Monitor *m;
 839         XExposeEvent *ev = &e->xexpose;
 840
 841         if(ev->count == 0 && (m = wintomon(ev->window)))
 842                 drawbar(m);
 843 }
 844
 845 void
 846 focus(Client *c) {
 847         if(!c || !ISVISIBLE(c))
 848                 for(c = selmon->stack; c && !ISVISIBLE(c); c = c->snext);
 849         /* was if(selmon->sel) */
 850         if(selmon->sel && selmon->sel != c)
 851                 unfocus(selmon->sel, False);
 852         if(c) {
 853                 if(c->mon != selmon)
 854                         selmon = c->mon;
 855                 if(c->isurgent)
 856                         clearurgent(c);
 857                 detachstack(c);
 858                 attachstack(c);
 859                 grabbuttons(c, True);
 860                 XSetWindowBorder(dpy, c->win, dc.sel[ColBorder].pixel);
 861                 setfocus(c);
 862         }
 863         else {
 864                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
 865                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
 866         }
 867         selmon->sel = c;
 868         drawbars();
 869 }
 870
 871 void
 872 focusin(XEvent *e) { /* there are some broken focus acquiring clients */
 873         XFocusChangeEvent *ev = &e->xfocus;
 874
 875         if(selmon->sel && ev->window != selmon->sel->win)
 876                 setfocus(selmon->sel);
 877 }
 878
 879 void
 880 focusmon(const Arg *arg) {
 881         Monitor *m;
 882
 883         if(!mons->next)
 884                 return;
 885         if((m = dirtomon(arg->i)) == selmon)
 886                 return;
 887         unfocus(selmon->sel, False); /* s/True/False/ fixes input focus issues
 888                                         in gedit and anjuta */
 889         selmon = m;
 890         focus(NULL);
 891 }
 892
 893 void
 894 focusstack(const Arg *arg) {
 895         Client *c = NULL, *i;
 896
 897         if(!selmon->sel)
 898                 return;
 899         if(arg->i > 0) {
 900                 for(c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);
 901                 if(!c)
 902                         for(c = selmon->clients; c && !ISVISIBLE(c); c = c->next);
 903         }
 904         else {
 905                 for(i = selmon->clients; i != selmon->sel; i = i->next)
 906                         if(ISVISIBLE(i))
 907                                 c = i;
 908                 if(!c)
 909                         for(; i; i = i->next)
 910                                 if(ISVISIBLE(i))
 911                                         c = i;
 912         }
 913         if(c) {
 914                 focus(c);
 915                 restack(selmon);
 916         }
 917 }
 918
 919 Atom
 920 getatomprop(Client *c, Atom prop) {
 921         int di;
 922         unsigned long dl;
 923         unsigned char *p = NULL;
 924         Atom da, atom = None;
 925
 926         if(XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
 927                               &da, &di, &dl, &dl, &p) == Success && p) {
 928                 atom = *(Atom *)p;
 929                 XFree(p);
 930         }
 931         return atom;
 932 }
 933
 934 XftColor
 935 getcolor(const char *colstr) {
 936         XftColor color;
 937
 938         if(!XftColorAllocName(dpy, DefaultVisual(dpy, screen), DefaultColormap(dpy, screen), colstr, &color))
 939                 die("error, cannot allocate color '%s'\n", colstr);
 940
 941         return color;
 942 }
 943
 944 Bool
 945 getrootptr(int *x, int *y) {
 946         int di;
 947         unsigned int dui;
 948         Window dummy;
 949
 950         return XQueryPointer(dpy, root, &dummy, &dummy, x, y, &di, &di, &dui);
 951 }
 952
 953 long
 954 getstate(Window w) {
 955         int format;
 956         long result = -1;
 957         unsigned char *p = NULL;
 958         unsigned long n, extra;
 959         Atom real;
 960
 961         if(XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
 962                               &real, &format, &n, &extra, (unsigned char **)&p) != Success)
 963                 return -1;
 964         if(n != 0)
 965                 result = *p;
 966         XFree(p);
 967         return result;
 968 }
 969
 970 Bool
 971 gettextprop(Window w, Atom atom, char *text, unsigned int size) {
 972         char **list = NULL;
 973         int n;
 974         XTextProperty name;
 975
 976         if(!text || size == 0)
 977                 return False;
 978         text[0] = '\0';
 979         XGetTextProperty(dpy, w, &name, atom);
 980         if(!name.nitems)
 981                 return False;
 982         if(name.encoding == XA_STRING)
 983                 strncpy(text, (char *)name.value, size - 1);
 984         else {
 985                 if(XmbTextPropertyToTextList(dpy, &name, &list, &n) >= Success && n > 0 && *list) {
 986                         strncpy(text, *list, size - 1);
 987                         XFreeStringList(list);
 988                 }
 989         }
 990         text[size - 1] = '\0';
 991         XFree(name.value);
 992         return True;
 993 }
 994
 995 void
 996 grabbuttons(Client *c, Bool focused) {
 997         updatenumlockmask();
 998         {
 999                 unsigned int i, j;
1000                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1001                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1002                 if(focused) {
1003                         for(i = 0; i < LENGTH(buttons); i++)
1004                                 if(buttons[i].click == ClkClientWin)
1005                                         for(j = 0; j < LENGTH(modifiers); j++)
1006                                                 XGrabButton(dpy, buttons[i].button,
1007                                                             buttons[i].mask | modifiers[j],
1008                                                             c->win, False, BUTTONMASK,
1009                                                             GrabModeAsync, GrabModeSync, None, None);
1010                 }
1011                 else
1012                         XGrabButton(dpy, AnyButton, AnyModifier, c->win, False,
1013                                     BUTTONMASK, GrabModeAsync, GrabModeSync, None, None);
1014         }
1015 }
1016
1017 void
1018 grabkeys(void) {
1019         updatenumlockmask();
1020         {
1021                 unsigned int i, j;
1022                 unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
1023                 KeyCode code;
1024
1025                 XUngrabKey(dpy, AnyKey, AnyModifier, root);
1026                 for(i = 0; i < LENGTH(keys); i++)
1027                         if((code = XKeysymToKeycode(dpy, keys[i].keysym)))
1028                                 for(j = 0; j < LENGTH(modifiers); j++)
1029                                         XGrabKey(dpy, code, keys[i].mod | modifiers[j], root,
1030                                                  True, GrabModeAsync, GrabModeAsync);
1031         }
1032 }
1033
1034 void
1035 incnmaster(const Arg *arg) {
1036         selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
1037         arrange(selmon);
1038 }
1039
1040 void
1041 initfont(const char *fontstr) {
1042
1043         if(!(dc.font.xfont = XftFontOpenName(dpy,screen,fontstr))
1044         && !(dc.font.xfont = XftFontOpenName(dpy,screen,"fixed")))
1045                 die("error, cannot load font: '%s'\n", fontstr);
1046
1047         dc.font.ascent = dc.font.xfont->ascent;
1048         dc.font.descent = dc.font.xfont->descent;
1049         dc.font.height = dc.font.ascent + dc.font.descent;
1050 }
1051
1052 #ifdef XINERAMA
1053 static Bool
1054 isuniquegeom(XineramaScreenInfo *unique, size_t n, XineramaScreenInfo *info) {
1055         while(n--)
1056                 if(unique[n].x_org == info->x_org && unique[n].y_org == info->y_org
1057                 && unique[n].width == info->width && unique[n].height == info->height)
1058                         return False;
1059         return True;
1060 }
1061 #endif /* XINERAMA */
1062
1063 void
1064 keypress(XEvent *e) {
1065         unsigned int i;
1066         KeySym keysym;
1067         XKeyEvent *ev;
1068
1069         ev = &e->xkey;
1070         keysym = XkbKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0, 0);
1071         for(i = 0; i < LENGTH(keys); i++)
1072                 if(keysym == keys[i].keysym
1073                 && CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)
1074                 && keys[i].func)
1075                         keys[i].func(&(keys[i].arg));
1076 }
1077
1078 void
1079 killclient(const Arg *arg) {
1080         if(!selmon->sel)
1081                 return;
1082         if(!sendevent(selmon->sel, wmatom[WMDelete])) {
1083                 XGrabServer(dpy);
1084                 XSetErrorHandler(xerrordummy);
1085                 XSetCloseDownMode(dpy, DestroyAll);
1086                 XKillClient(dpy, selmon->sel->win);
1087                 XSync(dpy, False);
1088                 XSetErrorHandler(xerror);
1089                 XUngrabServer(dpy);
1090         }
1091 }
1092
1093 void
1094 manage(Window w, XWindowAttributes *wa) {
1095         Client *c, *t = NULL;
1096         Window trans = None;
1097         XWindowChanges wc;
1098
1099         if(!(c = calloc(1, sizeof(Client))))
1100                 die("fatal: could not malloc() %u bytes\n", sizeof(Client));
1101         c->win = w;
1102         updatetitle(c);
1103         if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
1104                 c->mon = t->mon;
1105                 c->tags = t->tags;
1106         }
1107         else {
1108                 c->mon = selmon;
1109                 applyrules(c);
1110         }
1111         /* geometry */
1112         c->x = c->oldx = wa->x;
1113         c->y = c->oldy = wa->y;
1114         c->w = c->oldw = wa->width;
1115         c->h = c->oldh = wa->height;
1116         c->oldbw = wa->border_width;
1117
1118         if(c->x + WIDTH(c) > c->mon->mx + c->mon->mw)
1119                 c->x = c->mon->mx + c->mon->mw - WIDTH(c);
1120         if(c->y + HEIGHT(c) > c->mon->my + c->mon->mh)
1121                 c->y = c->mon->my + c->mon->mh - HEIGHT(c);
1122         c->x = MAX(c->x, c->mon->mx);
1123         /* only fix client y-offset, if the client center might cover the bar */
1124         c->y = MAX(c->y, ((c->mon->by == c->mon->my) && (c->x + (c->w / 2) >= c->mon->wx)
1125                    && (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
1126         c->bw = borderpx;
1127
1128         wc.border_width = c->bw;
1129         XConfigureWindow(dpy, w, CWBorderWidth, &wc);
1130         XSetWindowBorder(dpy, w, dc.norm[ColBorder].pixel);
1131         configure(c); /* propagates border_width, if size doesn't change */
1132         updatewindowtype(c);
1133         updatesizehints(c);
1134         updatewmhints(c);
1135         XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
1136         grabbuttons(c, False);
1137         if(!c->isfloating)
1138                 c->isfloating = c->oldstate = trans != None || c->isfixed;
1139         if(c->isfloating)
1140                 XRaiseWindow(dpy, c->win);
1141         attach(c);
1142         attachstack(c);
1143         XChangeProperty(dpy, root, netatom[NetClientList], XA_WINDOW, 32, PropModeAppend,
1144                         (unsigned char *) &(c->win), 1);
1145         XMoveResizeWindow(dpy, c->win, c->x + 2 * sw, c->y, c->w, c->h); /* some windows require this */
1146         setclientstate(c, NormalState);
1147         if (c->mon == selmon)
1148                 unfocus(selmon->sel, False);
1149         c->mon->sel = c;
1150         arrange(c->mon);
1151         XMapWindow(dpy, c->win);
1152         focus(NULL);
1153 }
1154
1155 void
1156 mappingnotify(XEvent *e) {
1157         XMappingEvent *ev = &e->xmapping;
1158
1159         XRefreshKeyboardMapping(ev);
1160         if(ev->request == MappingKeyboard)
1161                 grabkeys();
1162 }
1163
1164 void
1165 maprequest(XEvent *e) {
1166         static XWindowAttributes wa;
1167         XMapRequestEvent *ev = &e->xmaprequest;
1168
1169         if(!XGetWindowAttributes(dpy, ev->window, &wa))
1170                 return;
1171         if(wa.override_redirect)
1172                 return;
1173         if(!wintoclient(ev->window))
1174                 manage(ev->window, &wa);
1175 }
1176
1177 void
1178 monocle(Monitor *m) {
1179         unsigned int n = 0;
1180         Client *c;
1181
1182         for(c = m->clients; c; c = c->next)
1183                 if(ISVISIBLE(c))
1184                         n++;
1185         if(n > 0) /* override layout symbol */
1186                 snprintf(m->ltsymbol, sizeof m->ltsymbol, "[%d]", n);
1187         for(c = nexttiled(m->clients); c; c = nexttiled(c->next))
1188                 resize(c, m->wx, m->wy, m->ww - 2 * c->bw, m->wh - 2 * c->bw, False);
1189 }
1190
1191 void
1192 motionnotify(XEvent *e) {
1193         static Monitor *mon = NULL;
1194         Monitor *m;
1195         XMotionEvent *ev = &e->xmotion;
1196
1197         if(ev->window != root)
1198                 return;
1199         if((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
1200                 unfocus(selmon->sel, True);
1201                 selmon = m;
1202                 focus(NULL);
1203         }
1204         mon = m;
1205 }
1206
1207 void
1208 movemouse(const Arg *arg) {
1209         int x, y, ocx, ocy, nx, ny;
1210         Client *c;
1211         Monitor *m;
1212         XEvent ev;
1213
1214         if(!(c = selmon->sel))
1215                 return;
1216         if(c->isfullscreen) /* no support moving fullscreen windows by mouse */
1217                 return;
1218         restack(selmon);
1219         ocx = c->x;
1220         ocy = c->y;
1221         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1222         None, cursor[CurMove], CurrentTime) != GrabSuccess)
1223                 return;
1224         if(!getrootptr(&x, &y))
1225                 return;
1226         do {
1227                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1228                 switch(ev.type) {
1229                 case ConfigureRequest:
1230                 case Expose:
1231                 case MapRequest:
1232                         handler[ev.type](&ev);
1233                         break;
1234                 case MotionNotify:
1235                         nx = ocx + (ev.xmotion.x - x);
1236                         ny = ocy + (ev.xmotion.y - y);
1237                         if(nx >= selmon->wx && nx <= selmon->wx + selmon->ww
1238                         && ny >= selmon->wy && ny <= selmon->wy + selmon->wh) {
1239                                 if(abs(selmon->wx - nx) < snap)
1240                                         nx = selmon->wx;
1241                                 else if(abs((selmon->wx + selmon->ww) - (nx + WIDTH(c))) < snap)
1242                                         nx = selmon->wx + selmon->ww - WIDTH(c);
1243                                 if(abs(selmon->wy - ny) < snap)
1244                                         ny = selmon->wy;
1245                                 else if(abs((selmon->wy + selmon->wh) - (ny + HEIGHT(c))) < snap)
1246                                         ny = selmon->wy + selmon->wh - HEIGHT(c);
1247                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1248                                 && (abs(nx - c->x) > snap || abs(ny - c->y) > snap))
1249                                         togglefloating(NULL);
1250                         }
1251                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1252                                 resize(c, nx, ny, c->w, c->h, True);
1253                         break;
1254                 }
1255         } while(ev.type != ButtonRelease);
1256         XUngrabPointer(dpy, CurrentTime);
1257         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1258                 sendmon(c, m);
1259                 selmon = m;
1260                 focus(NULL);
1261         }
1262 }
1263
1264 Client *
1265 nexttiled(Client *c) {
1266         for(; c && (c->isfloating || !ISVISIBLE(c)); c = c->next);
1267         return c;
1268 }
1269
1270 void
1271 pop(Client *c) {
1272         detach(c);
1273         attach(c);
1274         focus(c);
1275         arrange(c->mon);
1276 }
1277
1278 void
1279 propertynotify(XEvent *e) {
1280         Client *c;
1281         Window trans;
1282         XPropertyEvent *ev = &e->xproperty;
1283
1284         if((ev->window == root) && (ev->atom == XA_WM_NAME))
1285                 updatestatus();
1286         else if(ev->state == PropertyDelete)
1287                 return; /* ignore */
1288         else if((c = wintoclient(ev->window))) {
1289                 switch(ev->atom) {
1290                 default: break;
1291                 case XA_WM_TRANSIENT_FOR:
1292                         if(!c->isfloating && (XGetTransientForHint(dpy, c->win, &trans)) &&
1293                            (c->isfloating = (wintoclient(trans)) != NULL))
1294                                 arrange(c->mon);
1295                         break;
1296                 case XA_WM_NORMAL_HINTS:
1297                         updatesizehints(c);
1298                         break;
1299                 case XA_WM_HINTS:
1300                         updatewmhints(c);
1301                         drawbars();
1302                         break;
1303                 }
1304                 if(ev->atom == XA_WM_NAME || ev->atom == netatom[NetWMName]) {
1305                         updatetitle(c);
1306                         if(c == c->mon->sel)
1307                                 drawbar(c->mon);
1308                 }
1309                 if(ev->atom == netatom[NetWMWindowType])
1310                         updatewindowtype(c);
1311         }
1312 }
1313
1314 void
1315 quit(const Arg *arg) {
1316         running = False;
1317 }
1318
1319 Monitor *
1320 recttomon(int x, int y, int w, int h) {
1321         Monitor *m, *r = selmon;
1322         int a, area = 0;
1323
1324         for(m = mons; m; m = m->next)
1325                 if((a = INTERSECT(x, y, w, h, m)) > area) {
1326                         area = a;
1327                         r = m;
1328                 }
1329         return r;
1330 }
1331
1332 void
1333 resize(Client *c, int x, int y, int w, int h, Bool interact) {
1334         if(applysizehints(c, &x, &y, &w, &h, interact))
1335                 resizeclient(c, x, y, w, h);
1336 }
1337
1338 void
1339 resizeclient(Client *c, int x, int y, int w, int h) {
1340         XWindowChanges wc;
1341
1342         c->oldx = c->x; c->x = wc.x = x;
1343         c->oldy = c->y; c->y = wc.y = y;
1344         c->oldw = c->w; c->w = wc.width = w;
1345         c->oldh = c->h; c->h = wc.height = h;
1346         wc.border_width = c->bw;
1347         XConfigureWindow(dpy, c->win, CWX|CWY|CWWidth|CWHeight|CWBorderWidth, &wc);
1348         configure(c);
1349         XSync(dpy, False);
1350 }
1351
1352 void
1353 resizemouse(const Arg *arg) {
1354         int ocx, ocy;
1355         int nw, nh;
1356         Client *c;
1357         Monitor *m;
1358         XEvent ev;
1359
1360         if(!(c = selmon->sel))
1361                 return;
1362         if(c->isfullscreen) /* no support resizing fullscreen windows by mouse */
1363                 return;
1364         restack(selmon);
1365         ocx = c->x;
1366         ocy = c->y;
1367         if(XGrabPointer(dpy, root, False, MOUSEMASK, GrabModeAsync, GrabModeAsync,
1368                         None, cursor[CurResize], CurrentTime) != GrabSuccess)
1369                 return;
1370         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1371         do {
1372                 XMaskEvent(dpy, MOUSEMASK|ExposureMask|SubstructureRedirectMask, &ev);
1373                 switch(ev.type) {
1374                 case ConfigureRequest:
1375                 case Expose:
1376                 case MapRequest:
1377                         handler[ev.type](&ev);
1378                         break;
1379                 case MotionNotify:
1380                         nw = MAX(ev.xmotion.x - ocx - 2 * c->bw + 1, 1);
1381                         nh = MAX(ev.xmotion.y - ocy - 2 * c->bw + 1, 1);
1382                         if(c->mon->wx + nw >= selmon->wx && c->mon->wx + nw <= selmon->wx + selmon->ww
1383                         && c->mon->wy + nh >= selmon->wy && c->mon->wy + nh <= selmon->wy + selmon->wh)
1384                         {
1385                                 if(!c->isfloating && selmon->lt[selmon->sellt]->arrange
1386                                 && (abs(nw - c->w) > snap || abs(nh - c->h) > snap))
1387                                         togglefloating(NULL);
1388                         }
1389                         if(!selmon->lt[selmon->sellt]->arrange || c->isfloating)
1390                                 resize(c, c->x, c->y, nw, nh, True);
1391                         break;
1392                 }
1393         } while(ev.type != ButtonRelease);
1394         XWarpPointer(dpy, None, c->win, 0, 0, 0, 0, c->w + c->bw - 1, c->h + c->bw - 1);
1395         XUngrabPointer(dpy, CurrentTime);
1396         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1397         if((m = recttomon(c->x, c->y, c->w, c->h)) != selmon) {
1398                 sendmon(c, m);
1399                 selmon = m;
1400                 focus(NULL);
1401         }
1402 }
1403
1404 void
1405 restack(Monitor *m) {
1406         Client *c;
1407         XEvent ev;
1408         XWindowChanges wc;
1409
1410         drawbar(m);
1411         if(!m->sel)
1412                 return;
1413         if(m->sel->isfloating || !m->lt[m->sellt]->arrange)
1414                 XRaiseWindow(dpy, m->sel->win);
1415         if(m->lt[m->sellt]->arrange) {
1416                 wc.stack_mode = Below;
1417                 wc.sibling = m->barwin;
1418                 for(c = m->stack; c; c = c->snext)
1419                         if(!c->isfloating && ISVISIBLE(c)) {
1420                                 XConfigureWindow(dpy, c->win, CWSibling|CWStackMode, &wc);
1421                                 wc.sibling = c->win;
1422                         }
1423         }
1424         XSync(dpy, False);
1425         while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
1426 }
1427
1428 void
1429 run(void) {
1430         XEvent ev;
1431         /* main event loop */
1432         XSync(dpy, False);
1433         while(running && !XNextEvent(dpy, &ev))
1434                 if(handler[ev.type])
1435                         handler[ev.type](&ev); /* call handler */
1436 }
1437
1438 void
1439 scan(void) {
1440         unsigned int i, num;
1441         Window d1, d2, *wins = NULL;
1442         XWindowAttributes wa;
1443
1444         if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
1445                 for(i = 0; i < num; i++) {
1446                         if(!XGetWindowAttributes(dpy, wins[i], &wa)
1447                         || wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
1448                                 continue;
1449                         if(wa.map_state == IsViewable || getstate(wins[i]) == IconicState)
1450                                 manage(wins[i], &wa);
1451                 }
1452                 for(i = 0; i < num; i++) { /* now the transients */
1453                         if(!XGetWindowAttributes(dpy, wins[i], &wa))
1454                                 continue;
1455                         if(XGetTransientForHint(dpy, wins[i], &d1)
1456                         && (wa.map_state == IsViewable || getstate(wins[i]) == IconicState))
1457                                 manage(wins[i], &wa);
1458                 }
1459                 if(wins)
1460                         XFree(wins);
1461         }
1462 }
1463
1464 void
1465 sendmon(Client *c, Monitor *m) {
1466         if(c->mon == m)
1467                 return;
1468         unfocus(c, True);
1469         detach(c);
1470         detachstack(c);
1471         c->mon = m;
1472         c->tags = m->tagset[m->seltags]; /* assign tags of target monitor */
1473         attach(c);
1474         attachstack(c);
1475         focus(NULL);
1476         arrange(NULL);
1477 }
1478
1479 void
1480 setclientstate(Client *c, long state) {
1481         long data[] = { state, None };
1482
1483         XChangeProperty(dpy, c->win, wmatom[WMState], wmatom[WMState], 32,
1484                         PropModeReplace, (unsigned char *)data, 2);
1485 }
1486
1487 Bool
1488 sendevent(Client *c, Atom proto) {
1489         int n;
1490         Atom *protocols;
1491         Bool exists = False;
1492         XEvent ev;
1493
1494         if(XGetWMProtocols(dpy, c->win, &protocols, &n)) {
1495                 while(!exists && n--)
1496                         exists = protocols[n] == proto;
1497                 XFree(protocols);
1498         }
1499         if(exists) {
1500                 ev.type = ClientMessage;
1501                 ev.xclient.window = c->win;
1502                 ev.xclient.message_type = wmatom[WMProtocols];
1503                 ev.xclient.format = 32;
1504                 ev.xclient.data.l[0] = proto;
1505                 ev.xclient.data.l[1] = CurrentTime;
1506                 XSendEvent(dpy, c->win, False, NoEventMask, &ev);
1507         }
1508         return exists;
1509 }
1510
1511 void
1512 setfocus(Client *c) {
1513         if(!c->neverfocus) {
1514                 XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
1515                 XChangeProperty(dpy, root, netatom[NetActiveWindow],
1516                                 XA_WINDOW, 32, PropModeReplace,
1517                                 (unsigned char *) &(c->win), 1);
1518         }
1519         sendevent(c, wmatom[WMTakeFocus]);
1520 }
1521
1522 void
1523 setfullscreen(Client *c, Bool fullscreen) {
1524         if(fullscreen) {
1525                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1526                                 PropModeReplace, (unsigned char*)&netatom[NetWMFullscreen], 1);
1527                 c->isfullscreen = True;
1528                 c->oldstate = c->isfloating;
1529                 c->oldbw = c->bw;
1530                 c->bw = 0;
1531                 c->isfloating = True;
1532                 resizeclient(c, c->mon->mx, c->mon->my, c->mon->mw, c->mon->mh);
1533                 XRaiseWindow(dpy, c->win);
1534         }
1535         else {
1536                 XChangeProperty(dpy, c->win, netatom[NetWMState], XA_ATOM, 32,
1537                                 PropModeReplace, (unsigned char*)0, 0);
1538                 c->isfullscreen = False;
1539                 c->isfloating = c->oldstate;
1540                 c->bw = c->oldbw;
1541                 c->x = c->oldx;
1542                 c->y = c->oldy;
1543                 c->w = c->oldw;
1544                 c->h = c->oldh;
1545                 resizeclient(c, c->x, c->y, c->w, c->h);
1546                 arrange(c->mon);
1547         }
1548 }
1549
1550 void
1551 setlayout(const Arg *arg) {
1552         if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
1553                 selmon->sellt ^= 1;
1554         if(arg && arg->v)
1555                 selmon->lt[selmon->sellt] = (Layout *)arg->v;
1556         strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof selmon->ltsymbol);
1557         if(selmon->sel)
1558                 arrange(selmon);
1559         else
1560                 drawbar(selmon);
1561 }
1562
1563 /* arg > 1.0 will set mfact absolutly */
1564 void
1565 setmfact(const Arg *arg) {
1566         float f;
1567
1568         if(!arg || !selmon->lt[selmon->sellt]->arrange)
1569                 return;
1570         f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
1571         if(f < 0.1 || f > 0.9)
1572                 return;
1573         selmon->mfact = f;
1574         arrange(selmon);
1575 }
1576
1577 void
1578 setup(void) {
1579         XSetWindowAttributes wa;
1580
1581         /* clean up any zombies immediately */
1582         sigchld(0);
1583
1584         /* init screen */
1585         screen = DefaultScreen(dpy);
1586         root = RootWindow(dpy, screen);
1587         initfont(font);
1588         sw = DisplayWidth(dpy, screen);
1589         sh = DisplayHeight(dpy, screen);
1590         bh = dc.h = dc.font.height + 2;
1591         updategeom();
1592         /* init atoms */
1593         wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
1594         wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
1595         wmatom[WMState] = XInternAtom(dpy, "WM_STATE", False);
1596         wmatom[WMTakeFocus] = XInternAtom(dpy, "WM_TAKE_FOCUS", False);
1597         netatom[NetActiveWindow] = XInternAtom(dpy, "_NET_ACTIVE_WINDOW", False);
1598         netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
1599         netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
1600         netatom[NetWMState] = XInternAtom(dpy, "_NET_WM_STATE", False);
1601         netatom[NetWMFullscreen] = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);
1602         netatom[NetWMWindowType] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE", False);
1603         netatom[NetWMWindowTypeDialog] = XInternAtom(dpy, "_NET_WM_WINDOW_TYPE_DIALOG", False);
1604         netatom[NetClientList] = XInternAtom(dpy, "_NET_CLIENT_LIST", False);
1605         /* init cursors */
1606         cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
1607         cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
1608         cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
1609         /* init appearance */
1610         dc.norm[ColBorder] = getcolor(normbordercolor);
1611         dc.norm[ColBG] = getcolor(normbgcolor);
1612         dc.norm[ColFG] = getcolor(normfgcolor);
1613         dc.sel[ColBorder] = getcolor(selbordercolor);
1614         dc.sel[ColBG] = getcolor(selbgcolor);
1615         dc.sel[ColFG] = getcolor(selfgcolor);
1616         dc.drawable = XCreatePixmap(dpy, root, DisplayWidth(dpy, screen), bh, DefaultDepth(dpy, screen));
1617         dc.gc = XCreateGC(dpy, root, 0, NULL);
1618         XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
1619         /* init bars */
1620         updatebars();
1621         updatestatus();
1622         /* EWMH support per view */
1623         XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
1624                         PropModeReplace, (unsigned char *) netatom, NetLast);
1625         XDeleteProperty(dpy, root, netatom[NetClientList]);
1626         /* select for events */
1627         wa.cursor = cursor[CurNormal];
1628         wa.event_mask = SubstructureRedirectMask|SubstructureNotifyMask|ButtonPressMask|PointerMotionMask
1629                         |EnterWindowMask|LeaveWindowMask|StructureNotifyMask|PropertyChangeMask;
1630         XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
1631         XSelectInput(dpy, root, wa.event_mask);
1632         grabkeys();
1633 }
1634
1635 void
1636 showhide(Client *c) {
1637         if(!c)
1638                 return;
1639         if(ISVISIBLE(c)) { /* show clients top down */
1640                 XMoveWindow(dpy, c->win, c->x, c->y);
1641                 if((!c->mon->lt[c->mon->sellt]->arrange || c->isfloating) && !c->isfullscreen)
1642                         resize(c, c->x, c->y, c->w, c->h, False);
1643                 showhide(c->snext);
1644         }
1645         else { /* hide clients bottom up */
1646                 showhide(c->snext);
1647                 XMoveWindow(dpy, c->win, WIDTH(c) * -2, c->y);
1648         }
1649 }
1650
1651 void
1652 sigchld(int unused) {
1653         if(signal(SIGCHLD, sigchld) == SIG_ERR)
1654                 die("Can't install SIGCHLD handler");
1655         while(0 < waitpid(-1, NULL, WNOHANG));
1656 }
1657
1658 void
1659 spawn(const Arg *arg) {
1660         if(fork() == 0) {
1661                 if(dpy)
1662                         close(ConnectionNumber(dpy));
1663                 setsid();
1664                 execvp(((char **)arg->v)[0], (char **)arg->v);
1665                 fprintf(stderr, "dwm: execvp %s", ((char **)arg->v)[0]);
1666                 perror(" failed");
1667                 exit(EXIT_SUCCESS);
1668         }
1669 }
1670
1671 void
1672 tag(const Arg *arg) {
1673         if(selmon->sel && arg->ui & TAGMASK) {
1674                 selmon->sel->tags = arg->ui & TAGMASK;
1675                 focus(NULL);
1676                 arrange(selmon);
1677         }
1678 }
1679
1680 void
1681 tagmon(const Arg *arg) {
1682         if(!selmon->sel || !mons->next)
1683                 return;
1684         sendmon(selmon->sel, dirtomon(arg->i));
1685 }
1686
1687 int
1688 textnw(const char *text, unsigned int len) {
1689         XGlyphInfo ext;
1690         XftTextExtentsUtf8(dpy, dc.font.xfont, (XftChar8 *) text, len, &ext);
1691         return ext.xOff;
1692 }
1693
1694 void
1695 tile(Monitor *m) {
1696         unsigned int i, n, h, mw, my, ty;
1697         Client *c;
1698
1699         for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
1700         if(n == 0)
1701                 return;
1702
1703         if(n > m->nmaster)
1704                 mw = m->nmaster ? m->ww * m->mfact : 0;
1705         else
1706                 mw = m->ww;
1707         for(i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
1708                 if(i < m->nmaster) {
1709                         h = (m->wh - my) / (MIN(n, m->nmaster) - i);
1710                         resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), False);
1711                         my += HEIGHT(c);
1712                 }
1713                 else {
1714                         h = (m->wh - ty) / (n - i);
1715                         resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), False);
1716                         ty += HEIGHT(c);
1717                 }
1718 }
1719
1720 void
1721 togglebar(const Arg *arg) {
1722         selmon->showbar = !selmon->showbar;
1723         updatebarpos(selmon);
1724         XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, selmon->ww, bh);
1725         arrange(selmon);
1726 }
1727
1728 void
1729 togglefloating(const Arg *arg) {
1730         if(!selmon->sel)
1731                 return;
1732         if(selmon->sel->isfullscreen) /* no support for fullscreen windows */
1733                 return;
1734         selmon->sel->isfloating = !selmon->sel->isfloating || selmon->sel->isfixed;
1735         if(selmon->sel->isfloating)
1736                 resize(selmon->sel, selmon->sel->x, selmon->sel->y,
1737                        selmon->sel->w, selmon->sel->h, False);
1738         arrange(selmon);
1739 }
1740
1741 void
1742 toggletag(const Arg *arg) {
1743         unsigned int newtags;
1744
1745         if(!selmon->sel)
1746                 return;
1747         newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
1748         if(newtags) {
1749                 selmon->sel->tags = newtags;
1750                 focus(NULL);
1751                 arrange(selmon);
1752         }
1753 }
1754
1755 void
1756 toggleview(const Arg *arg) {
1757         unsigned int newtagset = selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK);
1758
1759         if(newtagset) {
1760                 selmon->tagset[selmon->seltags] = newtagset;
1761                 focus(NULL);
1762                 arrange(selmon);
1763         }
1764 }
1765
1766 void
1767 unfocus(Client *c, Bool setfocus) {
1768         if(!c)
1769                 return;
1770         grabbuttons(c, False);
1771         XSetWindowBorder(dpy, c->win, dc.norm[ColBorder].pixel);
1772         if(setfocus) {
1773                 XSetInputFocus(dpy, root, RevertToPointerRoot, CurrentTime);
1774                 XDeleteProperty(dpy, root, netatom[NetActiveWindow]);
1775         }
1776 }
1777
1778 void
1779 unmanage(Client *c, Bool destroyed) {
1780         Monitor *m = c->mon;
1781         XWindowChanges wc;
1782
1783         /* The server grab construct avoids race conditions. */
1784         detach(c);
1785         detachstack(c);
1786         if(!destroyed) {
1787                 wc.border_width = c->oldbw;
1788                 XGrabServer(dpy);
1789                 XSetErrorHandler(xerrordummy);
1790                 XConfigureWindow(dpy, c->win, CWBorderWidth, &wc); /* restore border */
1791                 XUngrabButton(dpy, AnyButton, AnyModifier, c->win);
1792                 setclientstate(c, WithdrawnState);
1793                 XSync(dpy, False);
1794                 XSetErrorHandler(xerror);
1795                 XUngrabServer(dpy);
1796         }
1797         free(c);
1798         focus(NULL);
1799         updateclientlist();
1800         arrange(m);
1801 }
1802
1803 void
1804 unmapnotify(XEvent *e) {
1805         Client *c;
1806         XUnmapEvent *ev = &e->xunmap;
1807
1808         if((c = wintoclient(ev->window))) {
1809                 if(ev->send_event)
1810                         setclientstate(c, WithdrawnState);
1811                 else
1812                         unmanage(c, False);
1813         }
1814 }
1815
1816 void
1817 updatebars(void) {
1818         Monitor *m;
1819         XSetWindowAttributes wa = {
1820                 .override_redirect = True,
1821                 .background_pixmap = ParentRelative,
1822                 .event_mask = ButtonPressMask|ExposureMask
1823         };
1824         for(m = mons; m; m = m->next) {
1825                 if (m->barwin)
1826                         continue;
1827                 m->barwin = XCreateWindow(dpy, root, m->wx, m->by, m->ww, bh, 0, DefaultDepth(dpy, screen),
1828                                           CopyFromParent, DefaultVisual(dpy, screen),
1829                                           CWOverrideRedirect|CWBackPixmap|CWEventMask, &wa);
1830                 XDefineCursor(dpy, m->barwin, cursor[CurNormal]);
1831                 XMapRaised(dpy, m->barwin);
1832         }
1833 }
1834
1835 void
1836 updatebarpos(Monitor *m) {
1837         m->wy = m->my;
1838         m->wh = m->mh;
1839         if(m->showbar) {
1840                 m->wh -= bh;
1841                 m->by = m->topbar ? m->wy : m->wy + m->wh;
1842                 m->wy = m->topbar ? m->wy + bh : m->wy;
1843         }
1844         else
1845                 m->by = -bh;
1846 }
1847
1848 void
1849 updateclientlist() {
1850         Client *c;
1851         Monitor *m;
1852
1853         XDeleteProperty(dpy, root, netatom[NetClientList]);
1854         for(m = mons; m; m = m->next)
1855                 for(c = m->clients; c; c = c->next)
1856                         XChangeProperty(dpy, root, netatom[NetClientList],
1857                                         XA_WINDOW, 32, PropModeAppend,
1858                                         (unsigned char *) &(c->win), 1);
1859 }
1860
1861 Bool
1862 updategeom(void) {
1863         Bool dirty = False;
1864
1865 #ifdef XINERAMA
1866         if(XineramaIsActive(dpy)) {
1867                 int i, j, n, nn;
1868                 Client *c;
1869                 Monitor *m;
1870                 XineramaScreenInfo *info = XineramaQueryScreens(dpy, &nn);
1871                 XineramaScreenInfo *unique = NULL;
1872
1873                 for(n = 0, m = mons; m; m = m->next, n++);
1874                 /* only consider unique geometries as separate screens */
1875                 if(!(unique = (XineramaScreenInfo *)malloc(sizeof(XineramaScreenInfo) * nn)))
1876                         die("fatal: could not malloc() %u bytes\n", sizeof(XineramaScreenInfo) * nn);
1877                 for(i = 0, j = 0; i < nn; i++)
1878                         if(isuniquegeom(unique, j, &info[i]))
1879                                 memcpy(&unique[j++], &info[i], sizeof(XineramaScreenInfo));
1880                 XFree(info);
1881                 nn = j;
1882                 if(n <= nn) {
1883                         for(i = 0; i < (nn - n); i++) { /* new monitors available */
1884                                 for(m = mons; m && m->next; m = m->next);
1885                                 if(m)
1886                                         m->next = createmon();
1887                                 else
1888                                         mons = createmon();
1889                         }
1890                         for(i = 0, m = mons; i < nn && m; m = m->next, i++)
1891                                 if(i >= n
1892                                 || (unique[i].x_org != m->mx || unique[i].y_org != m->my
1893                                     || unique[i].width != m->mw || unique[i].height != m->mh))
1894                                 {
1895                                         dirty = True;
1896                                         m->num = i;
1897                                         m->mx = m->wx = unique[i].x_org;
1898                                         m->my = m->wy = unique[i].y_org;
1899                                         m->mw = m->ww = unique[i].width;
1900                                         m->mh = m->wh = unique[i].height;
1901                                         updatebarpos(m);
1902                                 }
1903                 }
1904                 else { /* less monitors available nn < n */
1905                         for(i = nn; i < n; i++) {
1906                                 for(m = mons; m && m->next; m = m->next);
1907                                 while(m->clients) {
1908                                         dirty = True;
1909                                         c = m->clients;
1910                                         m->clients = c->next;
1911                                         detachstack(c);
1912                                         c->mon = mons;
1913                                         attach(c);
1914                                         attachstack(c);
1915                                 }
1916                                 if(m == selmon)
1917                                         selmon = mons;
1918                                 cleanupmon(m);
1919                         }
1920                 }
1921                 free(unique);
1922         }
1923         else
1924 #endif /* XINERAMA */
1925         /* default monitor setup */
1926         {
1927                 if(!mons)
1928                         mons = createmon();
1929                 if(mons->mw != sw || mons->mh != sh) {
1930                         dirty = True;
1931                         mons->mw = mons->ww = sw;
1932                         mons->mh = mons->wh = sh;
1933                         updatebarpos(mons);
1934                 }
1935         }
1936         if(dirty) {
1937                 selmon = mons;
1938                 selmon = wintomon(root);
1939         }
1940         return dirty;
1941 }
1942
1943 void
1944 updatenumlockmask(void) {
1945         unsigned int i, j;
1946         XModifierKeymap *modmap;
1947
1948         numlockmask = 0;
1949         modmap = XGetModifierMapping(dpy);
1950         for(i = 0; i < 8; i++)
1951                 for(j = 0; j < modmap->max_keypermod; j++)
1952                         if(modmap->modifiermap[i * modmap->max_keypermod + j]
1953                            == XKeysymToKeycode(dpy, XK_Num_Lock))
1954                                 numlockmask = (1 << i);
1955         XFreeModifiermap(modmap);
1956 }
1957
1958 void
1959 updatesizehints(Client *c) {
1960         long msize;
1961         XSizeHints size;
1962
1963         if(!XGetWMNormalHints(dpy, c->win, &size, &msize))
1964                 /* size is uninitialized, ensure that size.flags aren't used */
1965                 size.flags = PSize;
1966         if(size.flags & PBaseSize) {
1967                 c->basew = size.base_width;
1968                 c->baseh = size.base_height;
1969         }
1970         else if(size.flags & PMinSize) {
1971                 c->basew = size.min_width;
1972                 c->baseh = size.min_height;
1973         }
1974         else
1975                 c->basew = c->baseh = 0;
1976         if(size.flags & PResizeInc) {
1977                 c->incw = size.width_inc;
1978                 c->inch = size.height_inc;
1979         }
1980         else
1981                 c->incw = c->inch = 0;
1982         if(size.flags & PMaxSize) {
1983                 c->maxw = size.max_width;
1984                 c->maxh = size.max_height;
1985         }
1986         else
1987                 c->maxw = c->maxh = 0;
1988         if(size.flags & PMinSize) {
1989                 c->minw = size.min_width;
1990                 c->minh = size.min_height;
1991         }
1992         else if(size.flags & PBaseSize) {
1993                 c->minw = size.base_width;
1994                 c->minh = size.base_height;
1995         }
1996         else
1997                 c->minw = c->minh = 0;
1998         if(size.flags & PAspect) {
1999                 c->mina = (float)size.min_aspect.y / size.min_aspect.x;
2000                 c->maxa = (float)size.max_aspect.x / size.max_aspect.y;
2001         }
2002         else
2003                 c->maxa = c->mina = 0.0;
2004         c->isfixed = (c->maxw && c->minw && c->maxh && c->minh
2005                      && c->maxw == c->minw && c->maxh == c->minh);
2006 }
2007
2008 void
2009 updatetitle(Client *c) {
2010         if(!gettextprop(c->win, netatom[NetWMName], c->name, sizeof c->name))
2011                 gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
2012         if(c->name[0] == '\0') /* hack to mark broken clients */
2013                 strcpy(c->name, broken);
2014 }
2015
2016 void
2017 updatestatus(void) {
2018         if(!gettextprop(root, XA_WM_NAME, stext, sizeof(stext)))
2019                 strcpy(stext, "dwm-"VERSION);
2020         drawbar(selmon);
2021 }
2022
2023 void
2024 updatewindowtype(Client *c) {
2025         Atom state = getatomprop(c, netatom[NetWMState]);
2026         Atom wtype = getatomprop(c, netatom[NetWMWindowType]);
2027
2028         if(state == netatom[NetWMFullscreen])
2029                 setfullscreen(c, True);
2030         if(wtype == netatom[NetWMWindowTypeDialog])
2031                 c->isfloating = True;
2032 }
2033
2034 void
2035 updatewmhints(Client *c) {
2036         XWMHints *wmh;
2037
2038         if((wmh = XGetWMHints(dpy, c->win))) {
2039                 if(c == selmon->sel && wmh->flags & XUrgencyHint) {
2040                         wmh->flags &= ~XUrgencyHint;
2041                         XSetWMHints(dpy, c->win, wmh);
2042                 }
2043                 else
2044                         c->isurgent = (wmh->flags & XUrgencyHint) ? True : False;
2045                 if(wmh->flags & InputHint)
2046                         c->neverfocus = !wmh->input;
2047                 else
2048                         c->neverfocus = False;
2049                 XFree(wmh);
2050         }
2051 }
2052
2053 void
2054 view(const Arg *arg) {
2055         if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
2056                 return;
2057         selmon->seltags ^= 1; /* toggle sel tagset */
2058         if(arg->ui & TAGMASK)
2059                 selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
2060         focus(NULL);
2061         arrange(selmon);
2062 }
2063
2064 Client *
2065 wintoclient(Window w) {
2066         Client *c;
2067         Monitor *m;
2068
2069         for(m = mons; m; m = m->next)
2070                 for(c = m->clients; c; c = c->next)
2071                         if(c->win == w)
2072                                 return c;
2073         return NULL;
2074 }
2075
2076 Monitor *
2077 wintomon(Window w) {
2078         int x, y;
2079         Client *c;
2080         Monitor *m;
2081
2082         if(w == root && getrootptr(&x, &y))
2083                 return recttomon(x, y, 1, 1);
2084         for(m = mons; m; m = m->next)
2085                 if(w == m->barwin)
2086                         return m;
2087         if((c = wintoclient(w)))
2088                 return c->mon;
2089         return selmon;
2090 }
2091
2092 /* There's no way to check accesses to destroyed windows, thus those cases are
2093  * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
2094  * default error handler, which may call exit.  */
2095 int
2096 xerror(Display *dpy, XErrorEvent *ee) {
2097         if(ee->error_code == BadWindow
2098         || (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
2099         || (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
2100         || (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
2101         || (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
2102         || (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
2103         || (ee->request_code == X_GrabButton && ee->error_code == BadAccess)
2104         || (ee->request_code == X_GrabKey && ee->error_code == BadAccess)
2105         || (ee->request_code == X_CopyArea && ee->error_code == BadDrawable))
2106                 return 0;
2107         fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
2108                         ee->request_code, ee->error_code);
2109         return xerrorxlib(dpy, ee); /* may call exit */
2110 }
2111
2112 int
2113 xerrordummy(Display *dpy, XErrorEvent *ee) {
2114         return 0;
2115 }
2116
2117 /* Startup Error handler to check if another window manager
2118  * is already running. */
2119 int
2120 xerrorstart(Display *dpy, XErrorEvent *ee) {
2121         die("dwm: another window manager is already running\n");
2122         return -1;
2123 }
2124
2125 void
2126 zoom(const Arg *arg) {
2127         Client *c = selmon->sel;
2128
2129         if(!selmon->lt[selmon->sellt]->arrange
2130         || (selmon->sel && selmon->sel->isfloating))
2131                 return;
2132         if(c == nexttiled(selmon->clients))
2133                 if(!c || !(c = nexttiled(c->next)))
2134                         return;
2135         pop(c);
2136 }
2137
2138 int
2139 main(int argc, char *argv[]) {
2140         if(argc == 2 && !strcmp("-v", argv[1]))
2141                 die("dwm-"VERSION", © 2006-2012 dwm engineers, see LICENSE for details\n");
2142         else if(argc != 1)
2143                 die("usage: dwm [-v]\n");
2144         if(!setlocale(LC_CTYPE, "") || !XSupportsLocale())
2145                 fputs("warning: no locale support\n", stderr);
2146         if(!(dpy = XOpenDisplay(NULL)))
2147                 die("dwm: cannot open display\n");
2148         checkotherwm();
2149         setup();
2150         scan();
2151         run();
2152         cleanup();
2153         XCloseDisplay(dpy);
2154         return EXIT_SUCCESS;
2155 }